A pile-forming steel pipe for bottom-expanding crushed stone pile and its construction method

Abstract

The invention discloses a pile-forming steel pipe for bottom-expanding crushed stone piles and a construction method thereof, wherein the pile-forming steel pipe for bottom-expanding gravel piles includes a straight pipe feeding part at the upper part of the pile pipe and a bottom-expanding part at the lower part, wherein the bottom-expanding part includes enlarged The head-type valve pile tip, the hydraulic propulsion device for expanding the bottom, the fixed shaft for the fixed connection of the side wall of the pile tube, and the pushing steel plate, the pushing steel plate is an even number, and is arranged symmetrically on the outside of the pile tube The bottom hydraulic propulsion device is arranged in the fixed shaft and connected with the pushing steel plate. The pile-forming steel pipe construction of the present invention can solve the problem that gravel piles form an inverted trapezoidal shape with a small bottom and a big top due to excessive self-weight stress of the lower soil body, which improves the bearing performance of the pile body itself and strengthens the resistance to the lower soil body at the same time. The compaction effect reduces the consolidation settlement of the composite foundation and greatly improves the bearing capacity.

Description

technical field [0001] The invention belongs to the field of special foundation treatment in geotechnical engineering, and relates to a bottom-expanding crushed stone pile and a construction method thereof, in particular to a bottom-expanding pile pipe used for expanding the bottom of a crushed stone pile to form a pile, and a bottom-expanding crushed stone pile construction method. Background technique [0002] Gravel piles were first used to strengthen weak foundations in 1935. They were first used to strengthen sandy soil foundations, and later used to strengthen cohesive soils. According to the information of Hughes and Withers, it was used in the construction of the arsenal in the Bayonne area of ​​France. The arsenal was located on the soft soil deposited in the bay. At that time, the designed pile diameter was 0.2m, the pile length was 2m, and the load borne by each pile was 10kN. The actual settlement after reinforcement is only a quarter of that before reinforcemen...

AI Technical Summary

Problems solved by technology

However, the processing and solution methods are single and backward, and there is no good method to solve the pile formed by the inverted ladder. The present invention provides a bottom-enlarging gravel pile, a bottom-expanding pile tube and a construction method for the bottom-expanding gravel pile in view of this phenomenon. , through expanding the bottom of the bottom of the pile tube to expand the bottom of the soil, it can well solve the problem of piles formed by inverted ladders of gravel piles, and at the same time increase the extrusion and compaction of the soil to improve the lateral binding force of the soil to prevent Pile lateral expansion failure

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