Double row pile and diagonal brace combined soft soil deep foundation pit supporting structure and construction method

Abstract

The invention relates to a double row pile and diagonal brace combined soft soil deep foundation pit supporting structure. An inner row pile and an outer row pile are arranged outside a foundation pit, a connecting plate, a top curing region, a pile block coupling beam and a vertical waterproof pile are arranged between the inner row pile and the outer row pile, and a vertical water-stop plate is inserted into the vertical waterproof pile; a pit bottom slurry soil fixing layer is arranged in the bottom of the foundation pit along the inner side of the inner row pile; a diagonal brace is arranged between the inner row pile and a basic raft board, and a vertical steel latticework column is arranged across the middle part of the diagonal brace; a bottom supporting pier is arranged at the connection of the diagonal brace and the basic raft board, and a waist beam is arranged at the connection of the diagonal brace and the inner row pile; and an anti-floating anchor and a main body structural pile are arranged under the basic raft board. The structure provided by the invention not only can enhance the stability of the foundation pit support structure and reduce the pit bottom rebound deformation, but also can prevent seepage failure of the foundation pit. The invention further discloses a construction method of the double row pile and diagonal brace combined soft soil deep foundation pit supporting structure.

Description

technical field [0001] The invention relates to a soft soil deep foundation pit support construction method that can effectively improve the support strength of the foundation pit and dynamically control the deformation of the support structure. It belongs to the field of underground engineering and is suitable for soft soil areas, deep Foundation pit support engineering. Background technique [0002] With the acceleration of the urbanization process in our country, people are developing and utilizing underground space more and more widely. Building foundation pit engineering presents the characteristics of "big, deep, tight and close", and various new enclosure forms and construction techniques are constantly emerging. . For large-area deep foundation pit projects, the traditional pile-anchor support method will be limited in construction space, especially in the case of limited construction sites, it is often difficult to lay horizontal reinforcement bodies, and the stabi...

AI Technical Summary

Problems solved by technology

This structure helps to improve the stability of the foundation pit support structure by comprehensively adopting diagonal braces and pulling anchors, but it is difficult for the structure to overcome the infiltration of external water, and at the same time, it fails to reinforce the bottom of the diagonal braces

[0005] To sum up, although the existing foundation pit support structure can obtain a good support effect under suitable working conditions, it is still not enough in terms of effective prevention and control of water infiltration outside the foundation pit, dynamic control of the support strength of diagonal braces, and reasonable organization of construction. Definitely not enough

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