A foundation pit support structure

Abstract

The invention discloses a supporting structure of a foundation pit. The supporting structure comprises jet grouting piles and a double-row pile structure which is inserted in the jet grouting piles, wherein the jet grouting piles are high-strength cement-soil pile bodies formed on a soil body around the foundation pit, and the multiple jet grouting piles are in mutual lap joint to form a reinforcing region; the double-row pile structure comprises a first row of cast-in-place piles, a second row of cast-in-place piles and connecting beams, the connecting beams are connected with the tops of the first row of cast-in-place piles and the tops of the second row of cast-in-place piles, and the first row of cast-in-place piles, the second row of cast-in-place piles and the connecting beams are all of a reinforced concrete structure. According to the scheme, the supporting structure aims to brace the deep foundation pit under the complicated geological condition with rich water and soft soil and under the condition that complicated barriers cut through the upper portions of the foundation pit; when the barriers such as cables cut through the upper portion of the foundation pit, the intervals between the cast-in-place piles can be flexibly adjusted to avoid the barriers; the large-diameter high-pressure jet grouting piles are in mutual lap joint, can effectively stop water and can control horizontal displacement of the soil body outside the pit along with the double rows of cast-in-place piles; the supporting structure formed by the cast-in-place piles is constructed in the large-diameter jet grouting piles, and therefore construction sites outside the foundation pit are saved.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a foundation pit support structure for underground engineering. Background technique [0002] With the continuous development of urbanization, people pay more and more attention to the utilization of underground space, and foundation pit engineering has been greatly developed. In my country's economically developed areas, there are mostly soft soil strata distributed in a wide range, and many deep foundation pit projects are carried out in urban water-rich and soft soil environments. Due to the large number of underground pipelines in the city, there are often obstacles such as important cables and pipelines passing through above the foundation pit, which cannot be moved, which cuts off the continuity of the enclosure structure, and the common underground diaphragm wall construction technology cannot be used. The pile row support structure can flexibly adjust th...

AI Technical Summary

Problems solved by technology

Due to the large number of underground pipelines in the city, there are often important cables, pipelines and other obstacles above the foundation pit that pass through and cannot be moved, which cuts off the continuity of the enclosure structure and cannot adopt the common underground diaphragm wall construction technology

The pile row support structure can flexibly adjust the pile spacing according to the position of obstacles, so as to avoid obstacles, but at the same time, it will cause excessive pile spacing and the risk of foundation pit instability due to too weak surrounding strata.

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