Immersed tunnel fractured joint staggered fireproof structure

Abstract

The invention discloses an immersed tunnel fractured joint staggered fireproof structure. The immersed tunnel fractured joint staggered fireproof structure comprises a plurality of layers of fire protection parts and fixing bolts. The fire protection parts are arranged at the bottom of an immersed tunnel fractured joint. Each layer of fire protection part comprises two fireproof plates, wherein one fireproof plate extends from the sidewall of one side of the immersed tunnel fractured joint to the sidewall of the other side of the immersed tunnel fractured joint; the other fireproof plate is arranged at the bottom of the sidewall of the other side; an expansion joint is reserved between the two fireproof plates. The expansion joints of every two adjacent layers of fireproof plates are located at the bottoms of different sidewalls. The immersed tunnel fractured joint staggered fireproof structure has the technical effects that the middle portion of the staggered fireproof structure is thick due to overlapping of the fireproof plates on the two sides, so that the heat insulation effect is good; moreover, the overlapping area of the fireproof plates on the two sides of the structure islarge; the sealing effect of the structure is further improved through rock wool filled up into reserved gaps of the expansion joints; the safety and stability of the immersed tunnel fractured jointduring a fire are improved; the risk that the fireproof structure is damaged due to deformation of the fractured joint is eliminated.

Description

technical field [0001] The invention relates to the field of tunnel fire prevention, in particular to a staggered fire prevention structure of segmented joints of an immersed tube tunnel. Background technique [0002] The joint is the key part and the weak link of the immersed tunnel, and it is also an important part in the design of the immersed tunnel. The current joint design focuses on research on waterproofing and shockproofing, and the fire resistance is insufficient. In terms of waterproofing of immersed tunnel joints, OMEGA waterstops are usually used. [0003] The OMEGA waterstop is a rubber waterstop with a high temperature range of -45°C-+60°C. At the same time, rubber, as a combustible material, is likely to lose its water-stop effect in the case of a tunnel fire or even cause high temperature due to fire. Burning occurs. Therefore, it is necessary to carry out fire and heat insulation protection for the chamber at the section joint and the waterstop at the joi...

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to carry out fire and heat insulation protection for the chamber at the joint and the waterstop at the joint. Generally, it can be realized by laying a fireproof board at the bottom. The structure also needs to have a certain degree of expansion and contraction capacity, otherwise, once the construction quality of the fire protection measures in this part is flawed or deformed during long-term use, the reliability of the fire protection measures in the section joint will be reduced.

Once a segment is deformed, cracks may appear in the fire protection structure of this part, resulting in a significant drop in fire resistance

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