Geotechnical engineering foundation pit anti-collapse stable supporting structure

Abstract

The invention discloses a geotechnical engineering foundation pit anti-collapse stable supporting structure. A supporting anchor rod of the geotechnical engineering foundation pit anti-collapse stable supporting structure sequentially penetrates through a supporting outer steel plate and supporting channel steel and then extends into the wall of a foundation pit, and a pre-tightening fixing head is arranged between the supporting anchor rod and the supporting outer steel plate. The pre-tightening fixing head can apply a pre-tightening force to the supporting anchor rod, so that the pre-tightening fixing head can be firstly used for pre-tightening a certain pre-tightening force, then an expanding agent is arranged in a concave cavity, the pre-tightening force of the supporting anchor rod is further increased through expansion of the expanding agent, and the pre-tightening force of anchoring is effectively improved. Meanwhile, damage to the pre-tightening fixing head or an anchor rod head caused by pre-tightening only through a pre-tightening tool is avoided, the pre-tightening force can be effectively improved, the pre-tightening effect is guaranteed, the supporting capacity is improved, and the loosening problem is prevented. According to the geotechnical engineering foundation pit anti-collapse stable supporting structure, the supporting channel steel and the outer supporting steel plate are adopted for supporting at the same time, and the supporting effect and stability are effectively improved.

Description

technical field [0001] Specifically, the invention relates to a rock-technical engineering foundation pit anti-collapse stable support structure, and relates to the field of stable support equipment for foundation pits. Background technique [0002] In geotechnical engineering, the support treatment of foundation pit is the basic construction process to ensure safe construction. For some foundation pits, especially soft rock foundation pit construction, it is difficult to achieve the required strength only by sprayed concrete and support nets, and it is easy to collapse. If the support method of the guard plate and the anchor rod is used for support, because the support pre-tightening force of the anchor rod is difficult to achieve an effective balance and the uniform pre-tightening of each support pre-tightening point, it is easy to have insufficient local pre-tightening force or local pre-tightening force. The problem of excessive tightening force. At the same time, insuf...

AI Technical Summary

Problems solved by technology

For some foundation pits, especially soft rock foundation pit construction, it is difficult to achieve the required strength only by sprayed concrete and support nets, and it is easy to collapse. If the support method of the guard plate and the anchor rod is used for support, because the support pre-tightening force of the anchor rod is difficult to achieve an effective balance and the uniform pre-tightening of each support pre-tightening point, it is easy to have insufficient local pre-tightening force or local pre-tightening force. The problem of excessive tightening force. At the same time, insufficient pre-tightening force will lead to the problem of loose support, while excessive pre-tightening force will easily cause local damage to the end of the pre-tightened anchor rod, which will affect the reliability of the support and support. protection effect, which leads to the decline of the protection performance of the foundation pit and affects the ability of safe construction

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