Construction method for increasing dry auger boring pouring pile bearing capacity
A technology of auger drilling and construction method, which is applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of large diameter of cast-in-situ piles, reduce frictional resistance, increase project cost, etc., and achieve the improvement of single pile bearing capacity, Improvement of pile end bearing capacity and reduction of engineering cost
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[0009] The construction method to improve the bearing capacity of dry screw bored piles is to design the pile length above the groundwater level, use the screw drill to dry drill to the design depth, and use a rammer to compact the virtual soil that falls on the bottom of the hole; close to the pile hole Two grouting pipes 3 are symmetrically fixed on the side wall of 1 using U-shaped cards 4. The grouting pipe 3 is made of a 20mm diameter PVC plastic pipe, which is connected to the grouting pipe at the height of the lower 1 / 3 of the pile hole On the one-way valve 5, the lower end of the grouting pipe 3 is bent toward the center of the pile hole and is in contact with the bottom of the hole. The side of the grouting pipe 3 that is 10cm below the one-way valve 5 in contact with the wall of the pile hole is processed with 6 grout holes 6 with a diameter of 4mm, 6-8 grout holes 6 with a diameter of 5mm are processed on the side where the lower part of the grouting pipe 3 is in contac...
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