A combined support structure for large-span deep foundation pits

Abstract

The invention discloses a large-span deep foundation pit combined support structure, which includes four mutually symmetrical support mechanisms and support walls, the four support mechanisms are installed inside the support walls, and the support mechanisms include the first A supporting frame, a fixing frame, a connecting frame, a second supporting frame and an arched frame; the outer surface of the first supporting frame is threadedly connected with the outer surface of the connecting frame through bolts; this structure is supported by four sets of supporting mechanisms wall, and each group of support mechanisms cooperates with each other through the first support frame, the second support frame, the connecting frame and the arch frame, and the horizontal tension of the soil layer on both sides is offset by the arch frame, corresponding to The first support frame and the second support frame cooperate with each other. Based on the principle of effective stress, the effective stress is doubled to offset the pore pressure of the soil layer, so that the structure can effectively withstand heavy pressure loads and meet the practical requirements of the structure.

Description

technical field [0001] The invention relates to the technical field of foundation pit support structures, in particular to a combined support structure for large-span deep foundation pits. Background technique [0002] Foundation pit support is to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, and the support, reinforcement and protection measures adopted for the side wall of the foundation pit and the surrounding environment; [0003] The most common cantilever support frame is limited by the traditional structural design. It is anchored in the poor and soft loose rock soil layer. From the perspective of the top view, the larger the span, the deeper the depth. The single-layer cantilever support The horizontal tensile force of the frame is difficult to withstand the lateral pressure of the soil, and the larger the span, the metal stress of each part of the cantilever itself will be torn under the triple tea...

AI Technical Summary

Problems solved by technology

[0003] The most common cantilever support frame is limited by the traditional structural design. It is anchored in the poor and soft loose rock soil layer. From the perspective of the top view, the larger the span, the deeper the depth. The single-layer cantilever support The horizontal tensile force of the frame is difficult to withstand the lateral pressure of the soil, and the larger the span, the metal stress of each part of the cantilever itself will be torn under the triple tear of gravity, weighing shear force and horizontal tensile force of the soil layer, and its service life will be greatly reduced. There will be greater constraints and impacts on construction

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