Construction method and structure of underground diaphragm wall capable of resisting bending and pulling

Abstract

The invention discloses a construction method and structure of an underground diaphragm wall capable of resisting bending and pulling. The structure comprises an I-shaped steel joint arranged on the side wall of a foundation pit, a pre-cast wall panel, a post-cast wall panel and post-cast blocks, wherein the pre-cast wall panel is located on one side of the I-shaped steel joint, and a pre-cast wall panel reinforcement cage is arranged in the pre-cast wall panel; the post-cast wall panel is located on the other side of the I-shaped steel joint, and a post-cast wall panel reinforcement cage is arranged in the post-cast wall panel; and the post-cast blocks are arranged on the sides, close to the foundation pit, of the pre-cast wall panel and the post-cast wall panel, a through hole is formed in a web of the I-shaped steel joint, the post-cast blocks are arranged in the through hole in a penetrating mode, the two ends of each post-cast block extend into the pre-cast wall panel and the post-cast wall panel respectively, and post-distributed reinforcement net racks are arranged in the post-cast blocks. According to the construction method and structure of the underground diaphragm wall capable of resisting bending and pulling, all the wall panels are connected into the complete wall capable of resisting bending and pulling, horizontally-distributed reinforcements of all the wall panels become stressed reinforcements, a bidirectional force transmission mechanism is achieved, and therefore the vertical reinforcement quantity can be reduced, cost is saved, and meanwhile the waterproofness of joints is enhanced.

Description

technical field [0001] The invention relates to the technical field of underground diaphragm wall construction, in particular to a construction method and structure of an underground diaphragm wall capable of resisting bending and tension. Background technique [0002] In the development of ultra-deep underground space, ultra-deep foundation pits are becoming more and more common. As the depth of foundation pits increases, the "depth-to-width ratio" of foundation pits tends to be closer to the size range (1 / 3~1) of the force of two-way slabs. The space effect in the stress of the protective structure is then highlighted. Compared with the one-way stress (vertical) in the shallow foundation pit, the load of the ultra-deep foundation pit envelope shows a state of two-way stress (vertical and transverse). However, the construction method of tying steel bars, hoisting and pouring in sections of the underground diaphragm wall determines that the horizontal steel bars at the wall...

AI Technical Summary

Problems solved by technology

However, the construction method of tying steel bars, hoisting and pouring in sections of the underground diaphragm wall determines that the horizontal steel bars at the wall joints are difficult to penetrate, and the existing various joint structures only consider the needs of waterproofing and do not consider the needs of force

This leads to two results: On the one hand, stronger and denser internal supports need to be set up to divide the enclosure wall into smaller "depth-to-width ratio" blocks to meet the requirements of one-way force (vertical) ; On the other hand, the steel bars that have been arranged in the horizontal direction of each wall cannot play the role of force and cannot share the load, which is not only a waste, but also leads to more dense vertical reinforcement of the ultra-deep foundation pit enclosure structure, which is not conducive to pouring

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