Fabricated multi-arch wall foundation pit supporting structure and construction technology

Abstract

The invention discloses a fabricated multi-arch wall foundation pit supporting structure and a construction technology, and belongs to the field of geotechnical engineering. The fabricated multi-archwall foundation pit supporting structure comprises precast concrete arch pieces and steel piles in the special shape like the Chinese character 'shan'. Arc-shaped steel with the H-shaped cross section, and each precast concrete arch piece are vertically combined together through casting, and the two arc pieces can be in butt joint at grooves of the arc-shaped steel in the vertical direction and connected at reserved holes through bolts. The cross section of each special-shaped pile shaped like the Chinese character 'shan', oblong reserved holes are formed in the flange of each steel pile at intervals and communicate with reserved holes in a corresponding arc piece connection rib, the oblong reserved holes in the steel piles can be connected with the reserved holes in the arc piece connection ribs through bolts, and reserved anchor rod holes can be formed in special-shaped pile webs. If a foundation pit is shallow, the special-shaped piles and the reinforced concrete precast arc piecesare subjected to combination construction, thus, a complete and closed cantilever pile foundation pit supporting system can be formed, no support or cat anchor need to be arranged, and if the foundation pit is deep, a cat anchor or an inner support can be additionally arranged.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to an assembled double-arch wall foundation pit support structure and a construction technique for foundation pit support using the support structure. Background technique [0002] The support system in the foundation pit project must ensure the safety of the underground structure construction and the surrounding environment of the foundation pit. At present, the support of deep foundation pits generally adopts the method of conventional bored concrete pouring piles or concrete underground diaphragm walls. Bored concrete pouring piles often require another water-stop curtain; the underground diaphragm wall needs a large wall thickness to meet the force requirements, and the amount of concrete used is large, so the compressive performance of concrete cannot be fully utilized. [0003] The arched structure has incomparable mechanical performance compared with other tr...

AI Technical Summary

Problems solved by technology

For example, Xia Xiong et al. disclosed a multi-arch sheet pile support structure, but there is no connecting device between the I-shaped pile and the prefabricated concrete arch piece, and a complete foundation pit support system has not been formed, so it cannot be independently used as a cantilever type support, and the piles and arches are prone to misalignment or even disjoint during construction, which affects the mechanical performance and anti-seepage function of the support system; The water-stop effect of the support structure is weakened due to easy falling off; the upper and lower connection methods of the prefabricated arch are connected by convex falcons and grooves, which leads to a sharp drop in the shear strength of the joint and becomes a weak link

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