hollow bar anchor is suitable for all the strata that retaining wall and soil nail wall

15/set/2017 04.21.20 hollowbar Contatta l'autore

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What is a hollow bar micropile? 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.
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