Soil nailing In Foundation Pit Support

09/gen/2016 11:06:45 sinorocksoilnailing Contatta l'autore

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The models of the traditional soil nailing support theory are mostly obtained through a large number of simplified. Current Foundation Pit bolting in slope, both the soil nailing support theory and the scene of the soil nailing support design are largely deviated from the actual.The Construction Requirements Of soil nailing In Foundation Pit Support1. The pitch error of soil nail drilled hole in the horizontal direction should not be greater than 100mm in the vertical direction, skewness should not be greater than 3%.

2. Grouting pipe should be banding together with soil nail, the first grouting from the bottom of the hole should be as 100-200mm, the second grouting pipe out of the hole should be filled slurry seal treatment;

3. Slurry should be prepared according to the design, selection of a filling sand ratio 1: 1-1: 2, water-cement ratio 0.38-0.45 cement mortar or grout cement ratio 0.45-0.5, the secondary high pressure grouting should be use the slurry water cement ratio of 0.45 to 0.45;

4. Secondary pressure grouting pressure should be controlled between 2.5-5.0Mpa, grouting time can be determined according to the grouting process test or a grouting intensity reached after 5MPa;

5. The tension and prestress of soil nail should meet the following requirements: anchorage strength is greater than 15Mpa and has reached the level of 75% of the design before proceeding with tension; Bolt tension sequence should consider the impact on the adjacent anchor; Anchor should be tensioned to design load of 0.9 to 1.0 times after the lock according to design requirements;

6. Soil nails selection shall be 1% of the total and not less than 3 ribs in accordance with relevant regulations each layer to bolt 
examination for soil nail acceptance test.

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