Column-free reinforced concrete support frame for deep and large foundation pits and construction method thereof

Abstract

The invention discloses an astylar reinforced concrete supporting framework for a deep and big foundation pit. The astylar reinforced concrete supporting framework comprises two containment mechanisms, two reinforcing mechanisms, a plurality of arch-shaped arched beams arranged side by side and a horizontal supporting mechanism, wherein each containment mechanism comprises a plurality of row piles, and the row piles are vertically drilled into the soil outside the two side walls of the foundation pit side by side; each reinforcing mechanism comprises a plurality of stand column piles, and the stand column piles are vertically drilled into the soil outside the two side walls of the foundation pit side by side and located on the sides, close to the two side walls of the foundation pit, of the containment mechanisms; the two ends of the arched beams are fixed to the reinforcing mechanisms respectively, the two side portions of the arched beams are located under the ground, and the middle portions of the arched beams are located on the ground; the horizontal supporting mechanism comprises a plurality of horizontal supporting beams which are transversely arranged side by side, and the two ends of the horizontal supporting beams are fixed to the tops of the containment mechanisms outside the two side walls of the foundation pit respectively. The invention further discloses a building method. The astylar reinforced concrete supporting framework for the deep and big foundation pit and the building method have the advantages that the soil excavation efficiency of the foundation pit is improved, cellar structure construction is planned more conveniently, the problems of the working space and waterproof processing in the prior art are solved, and the cost is saved.

Description

technical field [0001] The invention relates to a column-free reinforced concrete support frame for deep and large foundation pits and a construction method thereof, and is mainly applied in the technical field of geotechnical engineering. Background technique [0002] For deep and large foundation pits with large plane dimensions and large excavation depths, the internal support foundation pit support method currently used in China is mainly cast-in-place reinforced concrete support. The plane layout forms of reinforced concrete supports mainly include: grid form, opposite trusses, corner trusses, side trusses, ring supports, etc. The support components are divided into horizontal support beams and vertical support columns. The columns are set at the junction of beams and beams. The material is steel pipe or steel lattice structure. A pile foundation is set under each column, which mainly bears the vertical load and also bears the support. Part of the horizontal load trans...

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Problems solved by technology

[0003] 1: Since there are a large number of columns distributed in the foundation pit, when excavating each layer of earthwork in the foundation pit, it is necessary to avoid the columns when the excavator operates and the earthwork is transported outside, which greatly reduces the excavation efficiency. In addition, the superimposed effects of weather and city appearance control make the foundation The excavation progress of the pit earthwork is slow, which prolongs the use time of the foundation pit and the overall construction period, which adversely affects the safety of the foundation pit and the progress of the project

[0004] 2: Due to the large number of supporting components and columns in the foundation pit, the working space is cramped and the work efficiency is reduced during the construction of the proposed basement structure

[0005] 3: Due to the small spacing between the columns and the steel structure, various equipment are likely to cause damage to them during the excavation of the earthwork, thus affecting the safety of the foundation pit

[0006] 4: A large number of columns need to pass through the basement floor. Although waterproof steel plates are installed where the columns pass through the floor, it is difficult to guarantee the waterproof effect of the basement because the waterproof layer of the basement floor is pierced by the columns.

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