Concrete foundation pit supporting and monitoring construction technique based on axial force servo system

Abstract

The invention discloses a concrete foundation pit supporting and monitoring construction technique based on an axial force servo system. The concrete foundation pit supporting and monitoring construction technique comprises the steps of preparing for construction, constructing a foundation pit enclosure structure, constructing a support structure, installing the axial force servo system, applying axial force, performing earth excavation, constructing a foundation and a structural layer, removing the support structure layer by layer along with the construction of a basement structure, and monitoring a foundation pit. According to the construction technique, the direct connection of a support beam and an enclosing purlin in the prior art is changed into the connection of the support beam and a truss beam, axial force is transmitted to an enclosing purlin structure through the axial force servo system, finally, the axial force is distributed on the foundation pit enclosure structure, and the enclosing purlin of an area to which the axial force is applied by the axial force servo system is separated from other enclosing purlin support steel bars and concrete, so that a non-enhanced area is not influenced by the area to which the axial force is enhanced, the change of the axial force is actively controlled by the axial force servo system, so that the deformation of the foundation pit support structure can be effectively reduced, the stability and safety of the foundation pit are guaranteed, the axial force change and deformation of the reinforced concrete foundation pit support structure are monitored in real time, and danger early warning is given out in advance.

Description

technical field [0001] The invention relates to a building construction method, in particular to a concrete foundation pit support and monitoring construction technology based on an axial force servo system. Background technique [0002] In the construction of building foundation pits, it is necessary to use foundation pit support structures, including steel structure support systems and reinforced concrete structure support systems. Rods, connecting members, prestressed loading devices, servo control devices, joists and columns, purlins are arranged at the end or inside of the supporting piles / walls, supporting rods are supported on the purlins, and the supporting piles / walls hold the soil After the pressure is transmitted to the purlin, it is balanced by the supporting rods. The prestressing loading device is set on the supporting rods, and the prestressing loading device is controlled by the servo control device to adjust the supporting axial force. Balance the gravity o...

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Problems solved by technology

[0004] (1) This technology is only applicable to braced support structures, not to ring supports and corner brace structures;

[0005] (2) There are many and complicated steel structure connections, which require high technical requirements for construction and installation;

[0006] (3) The demand for specific steel structure materials is large and the quality requirements are high, and the transportation costs and risks are relatively high;

[0007] (4) The load-bearing support column is eccentrically stressed, and the stability of the support rod is poor, so it is not suitable for deep foundation pits that require multi-layer support structures;

[0008] (5) According to the characteristics of the project, there are potential safety hazards in the recycling and reuse of steel components after being deformed by force, and the residual value is not high

[0012] , but the servo system cannot be directly installed in the existing reinforced concrete structure, because the equipment of the servo system is a reusable equipment, and most of them are leased by the construction unit from the equipment leasing unit. If it is directly embedded in the concrete structure, it cannot be disassembled and will affect the equipment. The service life is not in line with the purpose of green and environmental protection construction, and it also greatly increases the cost; and in the foundation pit support project, generally only the local complex working conditions need to install the servo system, and the unified installation of the servo system will cause waste

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