A method for dismantling large-section multi-channel temporary intermediate partitions

Abstract

The invention relates to a dismantling method for a plurality of large-section temporary middle partition walls. The method includes the following steps that two I-shaped steel is dismantled every other one I-shaped steel frame; the bottom elevation of dismantled I-shaped steel frames should be kept basically consistent with the top face elevation of a structural bottom plate, and a supporting role can conveniently continue to be played after construction of the structural bottom plate; a rubber cushion plate and a supporting plate are crammed into gaps between the lower portion of the I-shaped steel and a waterproof plate, and the plane center of the rubber cushion plate and of the supporting plate is kept consistent with the center of the I-shaped steel; the installing positions of threaded steel supporting legs are drawn and determined, and the threaded steel supporting legs are attached to upper and lower leg plates of the I-shaped steel to be installed, and can form flat lap jointfaces with the planes of the leg plates; the threaded steel supporting legs and the I-shaped steel are symmetrically welded into a whole; the threaded steel supporting legs and the supporting plate are welded, and the I-shaped steel sits on the supporting plate; and reinforcing bar grids of the bottom plate structure are bound, the bottom elevation control line of the reinforcing bar grids is cutoff, and a concrete protecting layer is poured on the reinforcing bar grids of the bottom plate structure.

Description

technical field [0001] The invention belongs to the technical field of underground engineering underground excavation, and in particular relates to a method for removing large-section multi-channel temporary middle partitions. Background technique [0002] At present in China, the construction method of dividing the large section into multiple smaller independent caverns is often used in the construction of large-section underground excavation, so as to achieve large-span and small-span, large-section and small-section, rapid excavation and rapid closure The purpose of forming a ring. [0003] I-beams and shotcrete are used to form a temporary support structure between adjacent caverns. The support structure between the left and right caverns is called the temporary middle partition, and the temporary support structure between the upper and lower caverns is called the temporary inverted arch. After the independent caverns are formed, the temporary inverted arches and middle...

AI Technical Summary

Problems solved by technology

[0004] In the construction process of large-section underground structures in weak surrounding rock, most large sections will be constructed in a way of reducing size to size. During the excavation process, multiple temporary partitions and temporary inverted arches are designed. During dismantling, the stress system transformation is complicated and the safety risk is extremely high

[0005] The disadvantages of the currently adopted temporary middle partition demolition method are: 1. The demolition method of dismantling every other or not dismantling is adopted, and the initial support grid remaining in the lining structure needs to be waterproofed, which will affect the overall waterproofing effect of the structure. There is a certain impact; 2. No demolition or less demolition affects the working space of the second lining construction, and the construction efficiency is low

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