Construction method suitable for deep foundation pit support structure large in excavation area

Abstract

The invention relates to a construction method suitable for a deep foundation pit support structure large in excavation area. The construction method comprises the following steps that 1, the foundation pit support structure and an inclined strut support reaction structure are constructed; 2, earth unprotected open cut excavation is carried out, and a center area raft foundation is cast; 3, a first inclined steel support is mounted; 4, a second inclined steel support is mounted; 5, the second inclined steel support is demounted, a first underground body structure is constructed, and soil backfilling is carried out; and 6, the first inclined steel support is demounted, a second underground body structure is constructed, and soil backfilling is carried out. According to the construction method, underground structure raft foundations of a building under construction are effectively utilized as inner supporting points, reserved non-excavated soil is utilized periodically to form back pressure, foundation pit stability is guaranteed, cost is reduced, the construction period is shortened, and dust and noise pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, in particular to a foundation pit engineering, in particular to a construction method suitable for a deep foundation pit support structure with a large excavation area. Background technique [0002] In the process of urban development, the land is becoming more and more scarce, and the effective use of land resources is constantly decreasing, but the urban population is constantly expanding, and various projects are still in full swing, and there are two opposite development trends of underground and space. Engineering design directly leads to larger and larger foundation pit areas and deepening foundation pit depths. Deep foundation pit engineering construction has undoubtedly become the premise and foundation of various engineering constructions, and cannot be underestimated in terms of safety, quality, and construction period. [0003] In the current deep foundation pit engine...

AI Technical Summary

Problems solved by technology

[0007] Steel pipe braces have high requirements on construction technology. If the joints and support structures are not handled properly, or the construction support is not timely and accurate, it will cause instability; The technological requirements are also extremely high, and at the same time, it brings great inconvenience to the on-site construction and has a great impact on the total construction period.

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