Construction method of cast-in-situ concrete-supported prefabricated connecting beam in strip foundation pit

Abstract

The invention discloses a construction method of cast-in-place concrete diagonal braces and prefabricated girts of a strip-shaped foundation pit. Through the adoption of the construction method, the prefabricated girts and the cast-in-place concrete diagonal braces of the strip-shaped foundation pit are connected, and it can be guaranteed that internal force of the girts is effectively transmittedthrough a connecting structure; and meanwhile on the premise of meeting the requirements of the aspects of prefabricated component manufacturing, transporting, mounting and the like, the restraint function to the cast-in-place concrete diagonal braces is achieved, and the function of integrality of a first support structure is enhanced. The stress state of the cast-in-place concrete diagonal braces can be more simplified and tend to theoretical analysis, and site operation and fast mounting can be facilitated. Meanwhile, through prefabricated component splicing, the workload of later chiseling away is reduced, recycling of the prefabricated girts is achieved, the production efficiency is improved, and environment protection, energy saving and emission reducing are achieved; and the construction method is especially suitable for the strip-shaped foundation pit in the soft soil area, the building means of underground engineering are effectively expanded, industry technical progress is promoted, and good economic and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of foundation pit engineering, in particular to a construction method of a strip foundation pit cast-in-situ concrete braced prefabricated connecting beam. Background technique [0002] In recent years, with the acceleration of urbanization, in large and medium-sized cities with developed economy and heavy traffic, in order to improve regional traffic functions and humanized travel needs, such as pedestrian crossings, subway stations, transfer passages, basements The construction of various types of strip-shaped structures such as channels is in full swing. In some soft soil areas, such as Shanghai, the deformation of the foundation pit due to poor soil quality often causes the first support to be pulled. Therefore, in the evaluation of foundation pits in these areas, the first support is often required to be concrete support, and it is poured simultaneously with the concrete purlin to strengthen the integr...

AI Technical Summary

Problems solved by technology

Therefore, on the one hand, the method of integrally cast-in-place with the concrete support for the connecting beam with relatively simple force and relatively fixed form will make the concrete support more complicated; on the other hand, the repeated use of the connecting beam cannot be realized. It has caused a certain degree of waste, and increased the workload of later chisel removal, reducing production efficiency, which runs counter to the industrial direction of energy saving, emission reduction, and green environmental protection.

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