Construction method of all pounding type secondary soil-squeezing multi-head pedestal pile

Abstract

The invention discloses a construction method of an all pounding type secondary soil-squeezing multi-head pedestal pile. The construction method comprises the following steps of S1, conducting on-sitesetting-out, arranging a pile machine in position, arranging hard concrete at the pile location to form a pipe port sealing section of about 0.5 m; S2, sleeving an inner tube and an outer tube, pounding the two tubes, sinking the two tubes to reach a designed bearing stratum of a pile tip expanding pedestal section; S3, pulling out the inner tube, filling pile tip expanding pedestal section concrete and then sinking the inner tube; S4, pounding out the pile tip expanding pedestal section concrete; S5, pulling out the inner tube, filling pile body concrete and then sinking the inner tube; S6,pounding the inner tube and the pile body concrete; S7, repeating the step S5-S6 to complete filling and pounding of the pile body concrete and pile body expanding pedestal section concrete; and S8, horizontally moving a pile frame, hoisting a reinforcement cage, and aligning a reinforcement cage pipe expanding, tamping and inserting device with the pile position. The construction method has the characteristics that common quality problems during pile sinking are eliminated, and the integrity of a pile body is ensured, the compression bearing capacity and pulling resistance of a single pile are improved, and consumption of the pile body concrete is saved a lot.

Description

technical field [0001] The invention belongs to the technical field of bottom-expanding piles, and in particular relates to a construction method of a full-ramming double-squeezing multi-head bottom-expanding pile. Background technique [0002] Bottom expansion piles can be divided into bored bottom expansion piles, blasting piles, and shock expansion bottom piles according to their pile formation methods. Bottom expansion piles are cast-in-situ piles whose bottom diameter is larger than that of the upper pile body, and its single pile bearing capacity is greatly improved compared with that of straight piles with the same pile body diameter. [0003] However, the traditional construction method of sinking tube ramming and expanding piles is prone to common problems in pile sinking quality during construction, because only relying on the hammer weight pressure and inner tube self-weight pressure during pile formation cannot eliminate the compression of concrete by the shrinka...

AI Technical Summary

Problems solved by technology

[0003] However, the traditional construction method of sinking tube ramming and expanding piles is prone to common problems in pile sinking quality during construction, because only relying on the hammer weight pressure and inner tube self-weight pressure during pile formation cannot eliminate the compression of concrete by the shrinkage stress of the soil after pulling out the tube impact, causing the necking of the pile body, resulting in relatively poor integrity of the pile body after construction, and the bearing capacity of the single pile is average; placing a steel cage in the pipe will cause problems of collision and twisting of the cage, resulting in bending of the steel cage, resulting in construction schedule and quality problems. Difficult to meet design and construction requirements

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