Assembly type prestress applying device for foundation pit steel supporting structure

Abstract

The invention relates to an assembly type prestress applying device for a foundation pit steel supporting structure, and relates to the field of constructional engineering. The assembly type prestress applying device comprises a main connecting main body, an auxiliary connecting main body, a sliding toothed plate meshing locking assembly and a jack. The main connecting main body and the auxiliary connecting main body are combined into an integrated device and can only generate relative displacement in the prestress applying direction, the jack abuts against the auxiliary connecting main body and the main connecting main body to apply prestress, the main connecting main body is provided with a middle sliding toothed plate, the auxiliary connecting main body is provided with an end sliding toothed plate, the two toothed plates form the sliding toothed plate meshing locking assembly and are meshed with each other to achieve locking work of relative positions of the main connecting main body and the auxiliary connecting main body after the prestress is applied, and therefore the prestress is provided for the steel supporting structure. The assembly type prestress applying device is simple in structural component form, and has the advantages of sufficient rigidity and strength, real-time and controllable prestress loading, convenience in mounting and dismounting, easiness in maintenance and overhaul of components, small occupied space volume, capability of being recycled and the like.

Description

technical field [0001] The invention relates to the technical field of construction engineering foundation pit construction, in particular to an assembled prestressing device for foundation pit steel support structures. Background technique [0002] For foundation pit projects with a wide excavation range, large depth, and complex geological conditions, the required support system is huge and the project cost is high. In addition, during the excavation of the foundation pit, the soil at the bottom of the pit is in a state of unloading and rebounding. The stress in the soil at the bottom of the pit is redistributed, and the stress and deformation of the soil around the foundation pit will also change continuously. Due to the deformation requirements during pit excavation and the loss of prestress, there is a strong demand for prefabricated prestressed steel support structures that can maintain prestress. However, there are many deficiencies in the prestressing structure in t...

AI Technical Summary

Problems solved by technology

[0002] For foundation pit projects with a wide excavation range, large depth, and complex geological conditions, the required support system is huge and the project cost is high

In addition, during the excavation of the foundation pit, the soil at the bottom of the pit is in a state of unloading and rebounding. The stress in the soil at the bottom of the pit is redistributed, and the stress and deformation of the soil around the foundation pit will also change continuously. Due to the deformation requirements during pit excavation and the loss of prestress, there is a strong demand for fabricated prestressed steel support structures that can maintain prestress

However, there are many deficiencies in the prestressing structure in the prior art, such as complex equipment, high manufacturing costs, cumbersome installation process, poor structural reliability, and difficult maintenance.

Some prestressed structures cannot adjust the prestress in time when the foundation pit undergoes large deformation after preloading before construction, or the hydraulic cylinder needs to work continuously to maintain the prestress, etc. The cost of equipment and maintenance is high, and it is not suitable for large-scale use.

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