Deep foundation pit supporting system and construction method thereof

Abstract

The invention discloses a deep foundation pit supporting system and a construction method thereof. The deep foundation pit supporting system comprises top beams fixedly arranged at the tops of the twowall faces of a foundation pit, and further comprises two hoisting brackets and a plurality of sets of supporting devices, the two hoisting brackets are fixed to the two top beams correspondingly, and each set of supporting device comprises a supporting beam and two lowering mechanisms, wherein the supporting beam is transversely arranged between the two wall faces of the foundation pit, and thetwo lowering mechanisms are fixed to the two hoisting brackets correspondingly, and used for controlling rising and lowering of the supporting beam in the foundation pit. The deep foundation pit supporting system has the advantages that mounting is convenient and fast, the operation time is shortened, the equipment utilization rate is high, and supporting is firm.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a deep foundation pit support system and a construction method. 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. ...

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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

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