Self-balancing large-span deep foundation pit prestressed beam system

Abstract

The invention discloses a self-balancing large-span deep foundation pit prestressed beam system. The self-balancing large-span deep foundation pit prestressed beam system is arranged on a concrete beam on the inner wall of a foundation pit, a self-balancing prestressed beam supporting system comprises a plurality of web members fixed to the concrete beam, and the ends, away from the concrete beam, of the web members are movably connected to pull rods through pull rod connectors; the two ends of each pull rod are hinged to embedded parts embedded in the concrete beam correspondingly; the problem that a vertical bearing component must be arranged in a foundation pit in a conventional steel supporting system is solved; prestress is applied to the pull rods to react on the web members to balance the soil pressure outside the foundation pit; the large-span prestressed beam improves the excavation efficiency of earthwork in the foundation pit, reduces the material consumption of the supporting system, and saves the manufacturing cost; and the supporting system can be repeatedly used and has the advantages of being short in construction period, low in cost, good in safety performance, environmentally friendly, free of pollution and the like.

Description

technical field [0001] The invention relates to the field of foundation pit support systems, in particular to a self-balancing large-span prestressed beam system for deep foundation pits. Background technique [0002] Urban foundation pit projects are often located in dense areas of housing and lifeline projects. There are not only built houses or subway tunnels around the foundation pit, but also municipal pipelines such as water supply, gas supply pipes, communication, and power lines. If the excavation of the foundation pit causes a pit Excessive external deformation will affect the normal use of these pipelines or cause major accidents. Therefore, it is necessary to take a series of support measures before the excavation of the foundation pit to control the possible excessive deformation of the foundation pit slope. [0003] Existing string beams use section steel columns or concrete column interpolated section steel as vertical load-bearing members, see Figure 6 , the...

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Problems solved by technology

[0004] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a self-balancing large-span deep foundation pit prestressed beam system, which solves the problem that the conventional steel support system must set vertical load-bearing components in the foundation pit, and can pass through its own structure. Realize the balance of soil pressure outside the foundation pit; improve the efficiency of earthwork excavation in the foundation pit, save costs, and solve environmental pollution problems such as dust and mud

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