Comunicati.net - Comunicati pubblicati - hollowbar Comunicati.net - Comunicati pubblicati - hollowbar Tue, 23 Apr 2019 20:04:00 +0200 Zend_Feed_Writer 1.12.20 (http://framework.zend.com) http://comunicati.net/utenti/20498/1 Self drilling hollow bar support is an active form of support for engineering Tue, 26 Sep 2017 11:15:24 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453573.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453573.html hollowbar hollowbar The advantages of using self drilling hollow grouting anchor

(1) The construction process is simple, the operation is convenient, the construction period is reduced, the amount of the project is saved, the total construction period is shortened, the labor intensity of the workers is obviously reduced and the construction speed is improved.

(2) Economic and reasonable, reduce the cost of support and construction costs

(3) Advanced technology, safe and reliable, the project practice proves that under the premise of ensuring hollow grouting anchor bolt and anchor cable force, the anchor net and anchor wire and shotcrete combined support of large section cavern supporting effect is obvious, safe and reliable.

Self drilling hollow bar support is an active form of support, the support has the advantages such as low cost, fast supporting speed, low labor intensity, especially greatly simplifies the mining working face end support and advanced support technology, provides security for the rapid development of coal mining face. It is an important supporting technology for coal mine development in recent years.

The problems existing in the tail of the self drilling hollow anchor rod is prominent in the period of application process,due to eccentric load, the tail of the strength is not enough, the extension rate is not enough, leading to the supporting effect of variation, for this problem, the high strength thick tail self drilling hollow bolt anchor tail through special processing, the tail of the grain refinement to improve the shape and intensity of the self drilling hollow anchor bolt’s tail, brittle increase caused by defects in the heat treatment process has changed before, not only improves the anchor tail strength, but also improve the elongation of self drilling hollow anchor bolt’s tail . Field applications have also proved that this technology has greater advantages.

The machining precision of self drilling hollow anchor bolt’s screw friction is not high has influence on the self drilling hollow anchor bolt’s pre tightening force ,which is small to a large extent, improve the machining precision of hollow anchor bolt ‘s screw tail, the tail in coating lubricating oil can effectively eliminate the friction loss, reduce the loss of torque in friction, improve the pretightening force. Lubricating oil needs to be operated separately, increasing the operation process, and can not fundamentally solve the friction of the thread. Only by improving the accuracy of thread processing can the friction at the tail of hollow anchor bar ‘s thread be reduced fundamentally.

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Self drilling hollow bar support is an active form of support for engineering Tue, 26 Sep 2017 11:15:01 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453572.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453572.html hollowbar hollowbar The advantages of using self drilling hollow grouting anchor

(1) The construction process is simple, the operation is convenient, the construction period is reduced, the amount of the project is saved, the total construction period is shortened, the labor intensity of the workers is obviously reduced and the construction speed is improved.

(2) Economic and reasonable, reduce the cost of support and construction costs

(3) Advanced technology, safe and reliable, the project practice proves that under the premise of ensuring hollow grouting anchor bolt and anchor cable force, the anchor net and anchor wire and shotcrete combined support of large section cavern supporting effect is obvious, safe and reliable.

Self drilling hollow bar support is an active form of support, the support has the advantages such as low cost, fast supporting speed, low labor intensity, especially greatly simplifies the mining working face end support and advanced support technology, provides security for the rapid development of coal mining face. It is an important supporting technology for coal mine development in recent years.

The problems existing in the tail of the self drilling hollow anchor rod is prominent in the period of application process,due to eccentric load, the tail of the strength is not enough, the extension rate is not enough, leading to the supporting effect of variation, for this problem, the high strength thick tail self drilling hollow bolt anchor tail through special processing, the tail of the grain refinement to improve the shape and intensity of the self drilling hollow anchor bolt’s tail, brittle increase caused by defects in the heat treatment process has changed before, not only improves the anchor tail strength, but also improve the elongation of self drilling hollow anchor bolt’s tail . Field applications have also proved that this technology has greater advantages.

The machining precision of self drilling hollow anchor bolt’s screw friction is not high has influence on the self drilling hollow anchor bolt’s pre tightening force ,which is small to a large extent, improve the machining precision of hollow anchor bolt ‘s screw tail, the tail in coating lubricating oil can effectively eliminate the friction loss, reduce the loss of torque in friction, improve the pretightening force. Lubricating oil needs to be operated separately, increasing the operation process, and can not fundamentally solve the friction of the thread. Only by improving the accuracy of thread processing can the friction at the tail of hollow anchor bar ‘s thread be reduced fundamentally.

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Self drilling hollow bar support is an active form of support for engineering Tue, 26 Sep 2017 11:13:20 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453570.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453570.html hollowbar hollowbar  

The advantages of using self drilling hollow grouting anchor

(1) The construction process is simple, the operation is convenient, the construction period is reduced, the amount of the project is saved, the total construction period is shortened, the labor intensity of the workers is obviously reduced and the construction speed is improved.

(2) Economic and reasonable, reduce the cost of support and construction costs

(3) Advanced technology, safe and reliable, the project practice proves that under the premise of ensuring hollow grouting anchor bolt and anchor cable force, the anchor net and anchor wire and shotcrete combined support of large section cavern supporting effect is obvious, safe and reliable.

Self drilling hollow bar support is an active form of support, the support has the advantages such as low cost, fast supporting speed, low labor intensity, especially greatly simplifies the mining working face end support and advanced support technology, provides security for the rapid development of coal mining face. It is an important supporting technology for coal mine development in recent years.

The problems existing in the tail of the self drilling hollow anchor rod is prominent in the period of application process,due to eccentric load, the tail of the strength is not enough, the extension rate is not enough, leading to the supporting effect of variation, for this problem, the high strength thick tail self drilling hollow bolt anchor tail through special processing, the tail of the grain refinement to improve the shape and intensity of the self drilling hollow anchor bolt’s tail, brittle increase caused by defects in the heat treatment process has changed before, not only improves the anchor tail strength, but also improve the elongation of self drilling hollow anchor bolt’s tail . Field applications have also proved that this technology has greater advantages.

The machining precision of self drilling hollow anchor bolt’s screw friction is not high has influence on the self drilling hollow anchor bolt’s pre tightening force ,which is small to a large extent, improve the machining precision of hollow anchor bolt ‘s screw tail, the tail in coating lubricating oil can effectively eliminate the friction loss, reduce the loss of torque in friction, improve the pretightening force. Lubricating oil needs to be operated separately, increasing the operation process, and can not fundamentally solve the friction of the thread. Only by improving the accuracy of thread processing can the friction at the tail of hollow anchor bar ‘s thread be reduced fundamentally.

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Self drilling hollow bar support is an active form of support for engineering Tue, 26 Sep 2017 11:12:57 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453569.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453569.html hollowbar hollowbar  

The advantages of using self drilling hollow grouting anchor

(1) The construction process is simple, the operation is convenient, the construction period is reduced, the amount of the project is saved, the total construction period is shortened, the labor intensity of the workers is obviously reduced and the construction speed is improved.

(2) Economic and reasonable, reduce the cost of support and construction costs

(3) Advanced technology, safe and reliable, the project practice proves that under the premise of ensuring hollow grouting anchor bolt and anchor cable force, the anchor net and anchor wire and shotcrete combined support of large section cavern supporting effect is obvious, safe and reliable.

Self drilling hollow bar support is an active form of support, the support has the advantages such as low cost, fast supporting speed, low labor intensity, especially greatly simplifies the mining working face end support and advanced support technology, provides security for the rapid development of coal mining face. It is an important supporting technology for coal mine development in recent years.

The problems existing in the tail of the self drilling hollow anchor rod is prominent in the period of application process,due to eccentric load, the tail of the strength is not enough, the extension rate is not enough, leading to the supporting effect of variation, for this problem, the high strength thick tail self drilling hollow bolt anchor tail through special processing, the tail of the grain refinement to improve the shape and intensity of the self drilling hollow anchor bolt’s tail, brittle increase caused by defects in the heat treatment process has changed before, not only improves the anchor tail strength, but also improve the elongation of self drilling hollow anchor bolt’s tail . Field applications have also proved that this technology has greater advantages.

The machining precision of self drilling hollow anchor bolt’s screw friction is not high has influence on the self drilling hollow anchor bolt’s pre tightening force ,which is small to a large extent, improve the machining precision of hollow anchor bolt ‘s screw tail, the tail in coating lubricating oil can effectively eliminate the friction loss, reduce the loss of torque in friction, improve the pretightening force. Lubricating oil needs to be operated separately, increasing the operation process, and can not fundamentally solve the friction of the thread. Only by improving the accuracy of thread processing can the friction at the tail of hollow anchor bar ‘s thread be reduced fundamentally.

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Self drilling hollow bar support is an active form of support for engineering Tue, 26 Sep 2017 11:12:35 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453568.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453568.html hollowbar hollowbar  

The advantages of using self drilling hollow grouting anchor

(1) The construction process is simple, the operation is convenient, the construction period is reduced, the amount of the project is saved, the total construction period is shortened, the labor intensity of the workers is obviously reduced and the construction speed is improved.

(2) Economic and reasonable, reduce the cost of support and construction costs

(3) Advanced technology, safe and reliable, the project practice proves that under the premise of ensuring hollow grouting anchor bolt and anchor cable force, the anchor net and anchor wire and shotcrete combined support of large section cavern supporting effect is obvious, safe and reliable.

Self drilling hollow bar support is an active form of support, the support has the advantages such as low cost, fast supporting speed, low labor intensity, especially greatly simplifies the mining working face end support and advanced support technology, provides security for the rapid development of coal mining face. It is an important supporting technology for coal mine development in recent years.

The problems existing in the tail of the self drilling hollow anchor rod is prominent in the period of application process,due to eccentric load, the tail of the strength is not enough, the extension rate is not enough, leading to the supporting effect of variation, for this problem, the high strength thick tail self drilling hollow bolt anchor tail through special processing, the tail of the grain refinement to improve the shape and intensity of the self drilling hollow anchor bolt’s tail, brittle increase caused by defects in the heat treatment process has changed before, not only improves the anchor tail strength, but also improve the elongation of self drilling hollow anchor bolt’s tail . Field applications have also proved that this technology has greater advantages.

The machining precision of self drilling hollow anchor bolt’s screw friction is not high has influence on the self drilling hollow anchor bolt’s pre tightening force ,which is small to a large extent, improve the machining precision of hollow anchor bolt ‘s screw tail, the tail in coating lubricating oil can effectively eliminate the friction loss, reduce the loss of torque in friction, improve the pretightening force. Lubricating oil needs to be operated separately, increasing the operation process, and can not fundamentally solve the friction of the thread. Only by improving the accuracy of thread processing can the friction at the tail of hollow anchor bar ‘s thread be reduced fundamentally.

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Self drilling hollow bar support is an active form of support for engineering Tue, 26 Sep 2017 11:12:12 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453567.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453567.html hollowbar hollowbar  

The advantages of using self drilling hollow grouting anchor

(1) The construction process is simple, the operation is convenient, the construction period is reduced, the amount of the project is saved, the total construction period is shortened, the labor intensity of the workers is obviously reduced and the construction speed is improved.

(2) Economic and reasonable, reduce the cost of support and construction costs

(3) Advanced technology, safe and reliable, the project practice proves that under the premise of ensuring hollow grouting anchor bolt and anchor cable force, the anchor net and anchor wire and shotcrete combined support of large section cavern supporting effect is obvious, safe and reliable.

Self drilling hollow bar support is an active form of support, the support has the advantages such as low cost, fast supporting speed, low labor intensity, especially greatly simplifies the mining working face end support and advanced support technology, provides security for the rapid development of coal mining face. It is an important supporting technology for coal mine development in recent years.

The problems existing in the tail of the self drilling hollow anchor rod is prominent in the period of application process,due to eccentric load, the tail of the strength is not enough, the extension rate is not enough, leading to the supporting effect of variation, for this problem, the high strength thick tail self drilling hollow bolt anchor tail through special processing, the tail of the grain refinement to improve the shape and intensity of the self drilling hollow anchor bolt’s tail, brittle increase caused by defects in the heat treatment process has changed before, not only improves the anchor tail strength, but also improve the elongation of self drilling hollow anchor bolt’s tail . Field applications have also proved that this technology has greater advantages.

The machining precision of self drilling hollow anchor bolt’s screw friction is not high has influence on the self drilling hollow anchor bolt’s pre tightening force ,which is small to a large extent, improve the machining precision of hollow anchor bolt ‘s screw tail, the tail in coating lubricating oil can effectively eliminate the friction loss, reduce the loss of torque in friction, improve the pretightening force. Lubricating oil needs to be operated separately, increasing the operation process, and can not fundamentally solve the friction of the thread. Only by improving the accuracy of thread processing can the friction at the tail of hollow anchor bar ‘s thread be reduced fundamentally.

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Self drilling hollow bar support is an active form of support for engineering Tue, 26 Sep 2017 11:11:50 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453566.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453566.html hollowbar hollowbar  

The advantages of using self drilling hollow grouting anchor

(1) The construction process is simple, the operation is convenient, the construction period is reduced, the amount of the project is saved, the total construction period is shortened, the labor intensity of the workers is obviously reduced and the construction speed is improved.

(2) Economic and reasonable, reduce the cost of support and construction costs

(3) Advanced technology, safe and reliable, the project practice proves that under the premise of ensuring hollow grouting anchor bolt and anchor cable force, the anchor net and anchor wire and shotcrete combined support of large section cavern supporting effect is obvious, safe and reliable.

Self drilling hollow bar support is an active form of support, the support has the advantages such as low cost, fast supporting speed, low labor intensity, especially greatly simplifies the mining working face end support and advanced support technology, provides security for the rapid development of coal mining face. It is an important supporting technology for coal mine development in recent years.

The problems existing in the tail of the self drilling hollow anchor rod is prominent in the period of application process,due to eccentric load, the tail of the strength is not enough, the extension rate is not enough, leading to the supporting effect of variation, for this problem, the high strength thick tail self drilling hollow bolt anchor tail through special processing, the tail of the grain refinement to improve the shape and intensity of the self drilling hollow anchor bolt’s tail, brittle increase caused by defects in the heat treatment process has changed before, not only improves the anchor tail strength, but also improve the elongation of self drilling hollow anchor bolt’s tail . Field applications have also proved that this technology has greater advantages.

The machining precision of self drilling hollow anchor bolt’s screw friction is not high has influence on the self drilling hollow anchor bolt’s pre tightening force ,which is small to a large extent, improve the machining precision of hollow anchor bolt ‘s screw tail, the tail in coating lubricating oil can effectively eliminate the friction loss, reduce the loss of torque in friction, improve the pretightening force. Lubricating oil needs to be operated separately, increasing the operation process, and can not fundamentally solve the friction of the thread. Only by improving the accuracy of thread processing can the friction at the tail of hollow anchor bar ‘s thread be reduced fundamentally.

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Self drilling hollow bar support is an active form of support for engineering Tue, 26 Sep 2017 11:11:27 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453565.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/453565.html hollowbar hollowbar  

The advantages of using self drilling hollow grouting anchor

(1) The construction process is simple, the operation is convenient, the construction period is reduced, the amount of the project is saved, the total construction period is shortened, the labor intensity of the workers is obviously reduced and the construction speed is improved.

(2) Economic and reasonable, reduce the cost of support and construction costs

(3) Advanced technology, safe and reliable, the project practice proves that under the premise of ensuring hollow grouting anchor bolt and anchor cable force, the anchor net and anchor wire and shotcrete combined support of large section cavern supporting effect is obvious, safe and reliable.

Self drilling hollow bar support is an active form of support, the support has the advantages such as low cost, fast supporting speed, low labor intensity, especially greatly simplifies the mining working face end support and advanced support technology, provides security for the rapid development of coal mining face. It is an important supporting technology for coal mine development in recent years.

The problems existing in the tail of the self drilling hollow anchor rod is prominent in the period of application process,due to eccentric load, the tail of the strength is not enough, the extension rate is not enough, leading to the supporting effect of variation, for this problem, the high strength thick tail self drilling hollow bolt anchor tail through special processing, the tail of the grain refinement to improve the shape and intensity of the self drilling hollow anchor bolt’s tail, brittle increase caused by defects in the heat treatment process has changed before, not only improves the anchor tail strength, but also improve the elongation of self drilling hollow anchor bolt’s tail . Field applications have also proved that this technology has greater advantages.

The machining precision of self drilling hollow anchor bolt’s screw friction is not high has influence on the self drilling hollow anchor bolt’s pre tightening force ,which is small to a large extent, improve the machining precision of hollow anchor bolt ‘s screw tail, the tail in coating lubricating oil can effectively eliminate the friction loss, reduce the loss of torque in friction, improve the pretightening force. Lubricating oil needs to be operated separately, increasing the operation process, and can not fundamentally solve the friction of the thread. Only by improving the accuracy of thread processing can the friction at the tail of hollow anchor bar ‘s thread be reduced fundamentally.

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hollow bar anchor is suitable for all the strata that retaining wall and soil nail wall Fri, 15 Sep 2017 04:21:20 +0200 http://comunicati.net/comunicati/istituzioni/province/451845.html http://comunicati.net/comunicati/istituzioni/province/451845.html hollowbar hollowbar Hollow bar micropiles are manufactured from high yield micro alloy steel tubing. Hollow bars are installed using the injection bored method, which involves pumping at pressure a cementious grout while the hollow bar is drilled into the grout. This method has many geotechnical benefits and it improves a project’s overall efficiency. Generally speaking, hollow bar anchor is suitable for all the strata that retaining wall and soil nail wall and also the prestressed cable bolt can apply to . For the anchoring technology which has drilling operation requirements, drilling is usually the most critical process and directly affect the bearing capacity of the hollow bar. Drilling in the loose stratum or the stratum with groundwater, there is severe hole collapse phenomenon so that it’s necessary to add the casing to match. The use of casing can improve drilling progress, but have adverse effect on the bond between the mortar and the hole wall and meanwhile increase the difficulty and cost of construction. While hollow bar anchor applies very well for pebbles and boulders stratum. The disturbance part of surrounding rocks can be effectively reinforced through grouting and then the anchorage area will be enlarged. If water leakage appears during the drilling process, the method of blowing cement powder with a high-pressure wind to the hole can form a temporary wall around the drill hole so as to reduce the hole collapse phenomenon. Hollow bar anchor is suitable for broken rock, loose soil and conditions which are difficult to drill holes, such as fracture zones, decayed rock, gravel, sandy gravel, backfill ground. In order to have optimal result, drill bits can be used differently according to the rock conditions.]]> Construction industries with Sinorock hollow bar anchors Thu, 31 Aug 2017 11:28:22 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/448509.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/448509.html hollowbar hollowbar Thread hollow bar is a structural system by transmitting tension force to stable soil layer or stratum. Application fields are mainly reflected in mine roadway, slope of water conservancy project, constructional engineering, etc. Specifically, it is used for treatment of roadbed, protection of slope, support of underground deep foundation pit, stabilization of tunnel surrounding rock, foundation treatment and support of underground engineering and high-rise buildings.

Thread hollow bar supporting method has many prominent effect, such as improving support effect, lowering cost, fastening construction speed, reducing freight volume, relieving labor intensity, enhancing use ratio of tunnel cross-section, etc.

To be an ever-expanding international hollow bar manufacturer ,Sinorock offers to our customers an extensive supply of hollow bar products and services.The mission of Sinorock is to be the most
professional supplier among hollow bar suppliers in geotechnical engineering and
construction industries in Asia. We are proud to make good products that make the industries we serve safer and more efficient.

We are successfully meeting the needs of geotechnical anchorage industries as a renowned manufacturer, exporter & trader of hollow bar.Our Self drilling hollow bar systems are made using
high grade material and available in varied grades.We pack the product in standard quality corrugated boxes to save it from any damage during transportation.

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Sinorock self drilling hollow bar is an active support for construction Mon, 03 Jul 2017 08:50:58 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/438751.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/438751.html hollowbar hollowbar Self drilling hollow bar support is an active form of support, the support has the advantages such as low cost, fast supporting speed, low labor intensity, especially greatly simplifies the mining working face end support and advanced support technology, provides security for the rapid development of coal mining face. It is an important supporting technology for coal mine development in recent years.

Self drilling hollow grouting bolt is made up of drill bit,hollow rod body,anchor plate and anchor nut.It is mainly used for the supporting engineering in the loose and broken rock strata with difficult to drilling hole.Different is available to cater for the different rock strata condition.

Self drilling hollow bar’s designed tension is mainly depended by possibility, reliability and convenience of construction technique.

If tension designs too big, accordingly, the cross section and gravity are big, then it is difficult for inserting into hole and construction quality cannot be guaranteed, also it’s not easy to handle if tension test and validation test have problems; if tension designs too small, the amount of hollow anchor bolt should need many and the price costs high.

After confirming self drilling hollow bar’s tension, the design of cross section should depend on the design method of tensile bar, at the same time, the demand of construction should be readjusted if necessary.

The hollow anchor bolt’s head coupling should be designed basing on the principle design of prestressing force.

After confirmation of hollow anchor bolt, it’s necessary to calculate structures’ stability. If stability of structures can’t reach demand, the design of hollow anchor bolt should be reconsidered even if the design of every part of anchor bolt is reasonable and economic. Lengthening hollow anchor bolt, calculating again and consulting relevant calculation method to ensure stability of soil and rock, quality of projects.

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Hollow bar support of Sinorock provides safer space for constructions Thu, 25 May 2017 06:26:08 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/434126.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/434126.html hollowbar hollowbar Self drilling hollow bar system can ensure grouting anchor rod and the wall of hole full, giving full play to the bolt anchoring effect.Can provide immediately supporting force (or prestressed plate force) after the rock mass excavation ,effectively protect the inherent strength of rock mass, to prevent loosening and deformation of surrounding rock, and to enhance the stability of geotechnical engineering.The rod body have enough size package, which greatly improves the ability of resistance to corrosion, shows good durability.

Self drilling hollow bar anchor system is an effective mean of anchoring. It can be used to advanced support and radial support of railways, slope reinforcement, roadbed reinforcement and regulation project of tunnel disaster.Because of the excellent thickness seamless steel tube, the convenient and rapid thread forming process on surface and the perfect fittings, self-drilling anchor system can make the unify of drilling grouting and anchoring come true.

As the largest Chinese provider of hollow bar support solutions,Sinorock’s vision is to fill the needs of a growing number of clients, by focusing on innovation, strategic alliances, and industry-leading expertise.Sinorock's complete technology assists miners in ensuring rapid, safe advances through even the most difficult ground conditions.

Sinorock gains confidence in our self drilling hollow bar anchor sysyem manufacture.Sinorock Self drilling anchor system offers an ideal, flexible solution for earth retention systems. When subterranean reinforcements give way, anchors can be used to resist lateral pressure. Anchors can be used to stabilize damaged and failing earth retention walls.

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Sinorock hollow bar system manufactured for various constructions Sun, 02 Apr 2017 05:47:29 +0200 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/427392.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/427392.html hollowbar hollowbar The hollow anchor bolt system is comprised of a hollow threaded bar with an attached drill bit that performs drilling, anchoring and grouting in a single operation. The hollow bar allows air and water to freely pass through the bar during drilling to remove debris and then allow grout to be injected immediately after drilling is completed. Grout fills the hollow bar and completely covers the entire bolt. 

Couplers can be used to join hollow bars and extend the bolt length while nuts and plates are used to provide the required tension. The Self drilling rock bolts are known for their excellent load capacity and are available in Normal (N) and Special (S) types with diameters from 1 to 4 in. (25 to 103 mm).

The hollow anchor bolt is a reliable and convenient anchoring system which is applied in complicated geological conditions for rock support work. It is particularly applied in the following geological conditions, such as weathered rock, gravel layer, backfill, hard conglomerate, etc. The hollow anchor bolt is widely used in tunneling, the full seam gateway of the mine.

Sinorock supplies a wide range of capital equipment and anchor bolt for the global ground engineering markets.Sinorock will continue its rock bolting business within underground mining through manufacturing and distribution of anchor bolts.Sinorock will also continue to sell self drilling bolt in selected markets and applications.

Sinorock can handle both large quantity self drilling hollow bar system orders in the hundreds of thousands for the manufacturing industry and small orders for local repair shops. We service the mining industry, tunneling, slope foundation, hydroelectric, off road equipment dealers and manufacturing companies. Our customer service area is all of Nevada, including Las Vegas, and Elko, as well as Northern California.

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Sinorock’s hollow anchor bar system has great advantages for construction Sat, 25 Mar 2017 08:05:43 +0100 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/426536.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/426536.html hollowbar hollowbar Hollow bolt support  is the one of the most economic and effective method to improve the stability of geotechnical engineering.

Sinorock's high quality hollow bar systems  also work to stabilise foundations and support structures for excavation, making worksites safer. We work closely with geotechnical engineers to assist with project design and selection of anchor type after consideration of ground conditions, ensuring lasting integrity of all our hollow bar systems.

Sinorock’s hollow anchor bar system has great advantages. The hollow anchor bar combines drilling, grouting into single process. Thus, the work efficiency has been improved greatly. The hollow anchor bar manufactured by Sinorock has great quality and reasonable price. The products are exported to more than 20 countries and used in many kind of applications, like tunneling, mining, hydroelectric station and civil construction. Different kind of drill bits can be provided to meet the demands of different rock conditions. With good quality and excellent service, Sinorock has won great reputation from all over the world.

Sinorock is recognized for its excellent quality, delivery performance, innovative management and perfect service system.In addition,many products we have developed have become industry standards.The products we provide are all kinds of Self drilling hollow bar systems and the corresponding accessories.The sizes we can provide include R25, R32, R38, R51, T30, T40, T52, T73, T76, T103, T111, T127, T130. 

Self drilling hollow bar system is one of key product of Sinorock that needs no introduction. It is made of reinforced steel whose charm has appealed for hundreds of years. It is widely considered the most important anchoring product in geological engineerings and the greatest helper in the civil constructions. It can be used as anchor bar if needed,for it can combine drilling,anchoring and grouting together. 

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Sinorock self-drilling hollow grouting bolt in tunnel surrounding rock support Mon, 13 Mar 2017 07:11:10 +0100 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/424881.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/424881.html hollowbar hollowbar Application of self-drilling hollow grouting bolt in tunnel surrounding rock support

Summary

Since the type of hollow grouting bolt is a set of drilling, grouting, anchoring function in one of the new bolt, it can ensure high efficiency, safety and reliability in the complex formation. The application of this drilling method in tunnel surrounding rock support is described in detail in this article.

Introduction

Bolt anchoring support can give full play to the stability of the surrounding rock. It is widely used in road tunnel surrounding rock support.Permanent anchor bolts use ordinary mortar anchor mostly. But the grouting of ordinary mortar anchor is not sufficient, which leads to the actual effective anchorage zone cannot meet the design requirements.

In addition, it is hard to drill holes with the ordinary mortar injection bolt in the broken, loose rock condition. It results in failure of the bolt anchorage support.

Self-drilling hollow grouting anchor is a new set of drilling, grouting and anchoring functions into one. It can ensure the construction efficiently under the complex formation and reliable anchoring effect.

Comparative analysis of self-drilling hollow grouting anchor bolt and ordinary mortar injection anchor, ordinary hollow grouting bolt

In the same construction condition, respectively install Ф25 ordinary mortar anchor, hollow grouting anchor and self-drilling anchor (hereinafter referred as IBO hollow bar anchor) in the length of 2m and 5m. Mortar strength grade M30, anchorage by 150mm*150mm*60mm plates. The test results were analyzed as follows.

Pull out strength

As Table 1 shows, in the general crushing zone, 3 kinds of 2m anchor bolt tensile limit values are between 65-70 kN. The different from each other is not very big.

The pullout strength limit of 5m ordinary mortar anchor bolt is between 60-90 kN. The strength limit of two hollow IBO anchor types is between 140-150 kN. The increased pull resistance of Self-drilling anchor rods is not obvious.

In severe crushing zone, the pullout strength limit of 2m ordinary mortar anchor bolt is between 45-70 kN. For hollow grouting anchor and self-drilling anchor, the limit is between 60-75 kN. Decrease is not obvious.

For mortar grouting anchor bolt in the length of 5m, the strength limit is between 55-70 kN. And IBO bolt can achieve 130 to 145 kN. The pull strength advantage is very obvious.

In general, as the integrity of the rock mass decreases, the pull-out limit of the bolt decreases, and the ordinary mortar anchor decreases with the increase of the rock mass, and the hollow grouting anchor is more serious The loss of drawing limit in the broken rock mass is small.

Table 1: Comparison of anchor bolt pull strength

(Unit: kN)

Anchor Bolt Type 2m 5m
General broken area Severe broken area General broken area Severe broken area
Ordinary mortar anchor 65-75 45-70 60-90 55-70
Ordinary hollow bar anchor 65-75 65-75 140-150 130-145
IBO self-drilling anchor 65-75 65-75 140-150 130-145
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Sinorock hollow bars in a wide range of sizes and grades Sun, 22 Jan 2017 09:54:52 +0100 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/418790.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/418790.html hollowbar hollowbar Hollow bolt support is the one of the most economic and effective method to improve the stability of geotechnical engineering.

Stainless steel hollow bar in a wide range of sizes and grades. Sinorock's program of hollow bar includes several grades of austenitic stainless steel as well as duplex stainless steel. Sinorock provide many sizes of hollow bar for you .

Excellent machinability

Most grades of Sinorock's hollow bar are available as Sanmac, stainless steel with excellent and consistent machining properties for increased cutting speeds, reduced tool wear and set-up times.

Cutting services

Sinorock stainless hollow bar is delivered in random lengths or cut to fixed lengths. Random lengths depending on size and grade. Lengths down to 1 m may be included in the delivery.

Sinorock was founded in order to market anchor bolt Systems and technical know-how around the world and to develop innovative systems resulting from its own R&D activities.

The needs and requirements of clients and business partners are always of paramount importance. Characterized by reliability, trust and cooperation based on partnership,Sinorock offers its clients the advantages of an international system supplier with a product range that is tailored to suit individual requirements.In more than 30 countries and at 28 regional manufacturing sites,Sinorock develops, produces and supplies high quality systems such as anchor bolt Systems.

Regardless of what kind of foundation problem you’re experiencing,Sinorock can help. We have proven and effective answers to unsuitable soil quality, slab sinking, drywall or foundation cracks, and even settlement sinking. We will perform an in-depth analysis of your specific foundation issue and create a custom plan designed for your individual needs. We have worked in it all from pressure grouting to concrete leveling, foundation raising to radon 

mitigation.

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Advantages of Sinorock hollow bar anchor for difficult ground conditions Wed, 04 Jan 2017 10:10:25 +0100 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/416952.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/416952.html hollowbar hollowbar Hollow bar anchor is suitable for broken rock, loose soil and conditions which are difficult 

to drill holes, such as fracture zones, decayed rock, gravel, sandy gravel, backfill ground. 

In order to have optimal result, drill bits can be used differently according to the rock 

conditions.

Here the advantages of Sinorock hollow bar anchor

1. Low cost.

Compared with traditional supporting technologies, hollow injection anchor effectively 

decreases input and transport of supporting materials, then reduces materials’ cost.

Because hollow injection anchor penetrates into surrounding rock body, tunnel cross-section doesn’t need to be taken up, at design, it can decrease cross-sectional area, which will 

save excavation cost.

The stability of hollow injection anchor supporting is good, it can decrease amount of 

maintenance and then reduce cost of maintenance.

2. Rapid supporting function.

Compared with traditional supporting patterns, hollow injection anchor has small amount of materials and light weight, which can fasten transport speed and improve excavation 

efficiency.

 

During excavation, application of hollow injection anchor can reduce workers’ labor 

intensity, decrease operation procedure and improve working efficiency.

Hollow injection anchor combines drilling, grouting and anchoring together, construction 

procedure is simple. It can realize rapid surrounding rock support.

3. Good supporting effect.

 

Through analysis of hollow injection anchor supporting mechanism, hollow injection anchor 

belongs to active support. Using rock bodies’ self-supporting capacity to form stable 

structures, which can improve stability of integrity.

 

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Hollow bar anchor is widely used in foundation pit support engineering Mon, 26 Dec 2016 10:40:28 +0100 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/416515.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/416515.html hollowbar hollowbar <a href ="http://www.hollowbar.org/product/hollow-bar-anchor/"><b> Hollow bar anchor </b></a> is widely used in foundation pit support engineering recent years. It can combine drilling, grouting and anchoring together, time-saving and high-efficient. In addition, during the construction, there is no shake, no noise and no deformation phenomenon, it has little influence for surrounding environment. After its installation, the intensity of wall is strong, stiffness is big and supporting stability is good. If <a href ="http://www.hollowbar.org/"><b> hollow bar  </b></a>is shorter than designed depth, coupling is used to connect another one and lengthen it. Drill bit is made of materials with strong penetrating power, which can drill rock with different hardness. Grouting can keep certain pressure and be benefit for slurry filling gaps among surrounding rock. Nut can concentrate and transfer stress to its plate. Hollow bar for hydroelectric can also used for supporting slope, reinforcing surrounding terrain and avoiding collapse or other geological disasters.

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Sinorock - we are authorized stocking distributors for hollow anchor bolts Wed, 14 Dec 2016 09:35:29 +0100 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/415195.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/415195.html hollowbar hollowbar hollow anchor bolt which can support the rock at once after installation, own sufficient prestress and whole-grouted, and even infiltrate surrounding rock fissures. On one hand, the surrounding rock is broken, which makes the drilling holes are difficult to form. On the other hand, there are such special situations which require minimize vibration to avoid collapse. As an important form of reinforcement in geotechnical engineering,hollow anchor bolt supporting is safe, effective, and economical, etc. Therefore, the hollow anchor bolt will have more and more application in the international geotechnical engineering fields. Sinorock prides itself on supplying innovative, cost-effective, safe and optimal quality hollow bar products to its customers. All products are backed by years of related experience and expertise in underground mining operations. Sinorock is a SABS ISO 9001:2008 accredited company that places emphasis on quality work and continuous improvements to its products. The Sinorock company was built on a foundation of experience, determination, service and quality earning us an outstanding reputation for manufacturing quality anchor bolt products in all types of materials. At Sinorock Company we are authorized stocking distributors for hollow anchor bolts. We also stock standard & long type SDA bolts in a variety of materials such as: corrosion resistant nickel,stainless steeland HDG (Hot Dipped Galvanize), zinc plated, Polytetrafluoroethylene coated, & polyolefin coated.]]> Sinorock has various sizes of hollow bars Thu, 08 Dec 2016 08:48:52 +0100 http://comunicati.net/comunicati/istituzioni/comuni/basilicata/414637.html http://comunicati.net/comunicati/istituzioni/comuni/basilicata/414637.html hollowbar hollowbar Self drilling hollow anchor bar system plays a vital role in the tunneling construction. Sinorock is one of the most respected global manufacturer of self drilling hollow anchor bar system and a cornerstone of innovation in the industry.Together with our customers, we deliver our quality self drilling hollow anchor bar system for landmark projects—the modern marvels of the world—that foster sustainable progress and grow economies. Sinorock is famous for it’s hollow bar,which has many types and sizes. Sinorock offers a range of accessories for hollow bars to suit different applications. The most common components are anchor head,centralizers, grout swivels and the pull-test facility for testing the hollow bars. Features & benefits Reduced installation time increases productivity Faster excavation Easy to handle Sinorock offers a range of accessories for hollow bars to suit a variety of applications. The most common components are anchor head, mesh washers and stop-grouting plug, as well as the pull-test equipment for testing the indispensable rock bolting system.]]>