SMW construction method for arranging elliptic-cone-shaped pile head at end of H-shaped steel

Abstract

The invention discloses an SMW construction method for arranging an elliptic-cone-shaped pile head at the end of H-shaped steel. According to method, the elliptic-cone-shaped pile head, the cut H-shaped steel and a cemented soil solidification body are included, wherein the top of the elliptic-cone-shaped pile head is provided with a reserved gap matched with a web of the H-shaped steel in thickness, and the web of the H-shaped steel can be inserted in the reserved gap; a V-shaped boundary is cut in a wing plate at the lower end of the H-shaped steel through a cutting tool to reduce insertion resistance during construction. In the construction process through an existing SMW construction method, in order to reduce the insertion resistance to the H-shaped steel, an anti-friction agent is smeared on the surface of the H-shaped steel before the H-shaped steel is inserted; on this basis, the end of the H-shaped steel is cut into the V shape, and the H-shaped steel is inserted in the gap of the elliptic-cone-shaped pile head to form a streamline structure; the elliptic-cone-shaped pile head can separate cemented soil, so the insertion resistance to the H-shaped steel can be effectively lowered, the insertion speed can be increased, and the construction period can be shortened; due to the design of the elliptic-cone-shaped pile head, a guiding effect can also be achieved in the inserting process of the H-shaped steel, and the H-shaped steel is prevented from deflecting in the sinking process during construction.

Description

technical field [0001] The invention relates to a SMW construction method with an elliptical cone-shaped pile head at the end of an H-shaped steel, which can effectively increase the insertion speed of the section steel, and is suitable for the SMW construction method and other construction technologies that need to insert section steel, and belongs to the building foundation pit engineering and edge construction. slope engineering field. Background technique [0002] With the development of the economy and the acceleration of the urbanization process, the buildings in the central urban area are becoming more and more dense, especially a large number of new high-rise and super high-rise buildings, the basements of the buildings are becoming larger and deeper, and a large number of deep foundation pits have emerged project. At present, the support schemes commonly used in my country include: sloping excavation, soil nail wall support, pile anchor support, cement-soil gravity...

AI Technical Summary

Problems solved by technology

Slope excavation, soil nail wall support, and pile-anchor support construction will inevitably exceed the building red line, but because the land outside the building red line is restricted by national policies or requires permission from relevant departments, this will bring difficulties to the smooth construction of the building basement. The construction of cast-in-situ piles in soft soil will inevitably face the problems of difficult pile formation, large concrete filling coefficient, and poor pile quality; while the SMW construction method has less disturbance to the adjacent soil during construction, and can be close to the red line of the building. However, the SMW construction method has the problem of large insertion resistance when inserting H-shaped steel, and under the influence of insertion resistance, it is difficult to control the verticality of the steel, which affects the pile. force performance

[0003] The traditional construction method is to use anti-friction agent to reduce the insertion resistance, but the effect is average, and the anti-friction agent is easy to peel off, and the drag reduction effect is easily affected

Therefore, there are certain limitations in using the traditional method of applying antifriction agent and inserting the section steel under the action of the section steel's own weight

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