A deep foundation pit support system

Abstract

The invention discloses a support system for a deep foundation pit, which includes a crown beam fixedly arranged on the top of two wall surfaces of the foundation pit, and also includes two lifting brackets and multiple sets of supporting devices, and the two lifting brackets are respectively fixed on the crown beam , each set of supporting devices includes a supporting beam and two lowering mechanisms, the supporting beam is horizontally arranged between the two walls of the foundation pit, and the two lowering mechanisms are respectively fixed on two lifting brackets, and are used to control the movement of the supporting beam in the foundation pit Lifting; the advantages are convenient installation, reduced working time, high equipment utilization and firm support.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a deep foundation pit support system. Background technique [0002] With the rapid development of rail transit, there are more and more deep foundation pit projects in cities, and they are getting deeper and deeper. Generally, in order to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, the side walls of the foundation pit and the surrounding environment will be supported to prevent excessive deformation of the foundation pit or surface settlement. Separated from the rest, work is concentrated in areas enclosed by concrete walls. [0003] The conventional foundation pit construction is excavated step by step. After the excavation of each layer of soil is completed, the support frame is lifted by large lifting equipment, and then it is hoisted to the design position for installation. The axial force is pre-ad...

AI Technical Summary

Problems solved by technology

[0003] The conventional foundation pit construction is excavated step by step. After the excavation of each layer of soil is completed, the support frame is lifted by large lifting equipment, and then it is hoisted to the design position for installation. The axial force is pre-added, but the above-mentioned construction method has the following disadvantages: 1. The installation of the support frame is visually positioned by the construction personnel, which often causes deviations in the installation, and often requires multiple adjustments to reach the design position. Time-consuming, between the excavation of each layer of soil and the completion of the installation of the support frame, the foundation pit has an unsupported exposure time of 8-12 hours, and there are certain safety hazards; 2. With the continuous increase of the excavation depth of the foundation pit , the difficulty of hoisting will also increase significantly, and there will often be problems of limited number of large-scale equipment and difficult turnover. In addition, the periodic utilization rate of equipment is low, which will cause unnecessary economic losses; 3. Affected by temperature difference and stress relaxation, there will be The loss of supporting axial force, with the loss of supporting axial force, the deformation of the foundation pit increases, which will have a negative impact on the deformation control of the foundation pit and the overall safety of the foundation pit

Images