Fireproof structure of pipe joints in immersed tunnels

Abstract

A fire protection structure applied to a segment joint of an immersed tunnel comprises a watertight band assembly (10) and a fire protection assembly (30) that are connected between two adjacent tunnel segments (50) and spaced apart from each other. The fire protection assembly (30) is positioned at an inner side of the watertight band assembly (10). The fire protection assembly (30) comprises: a protection plate assembly (31), comprising a first fire protection plate (311) and a second fire protection plate (313) that are spaced apart from each other and a heat insulation member (33) fixed therebetween, wherein one end of each of the first fire protection plate (311) and the second fire protection plate (313) is connected to one tunnel segment (50), and the other end thereof is movably connected to the other tunnel segment (50); and a flexible fire protection band (35), positioned between the first fire protection plate (311) and the second fire protection plate (313), wherein one end of the flexible fire protection band (35) is connected to the heat insulation member (33), and the other end thereof is connected to the tunnel segment (50).

Description

technical field [0001] The invention relates to the technical field of immersed tube tunnels, in particular to a fireproof structure for pipe joint joints of immersed tube tunnels. Background technique [0002] In the immersed tube construction tunnel, the connection between two adjacent pipelines needs to be connected with a waterproof belt assembly, such as a rubber waterstop strip, to prevent external moisture from penetrating into the pipeline through the connection. The waterproof belt assembly In addition to meeting the longitudinal expansion and contraction displacement between tunnel pipe sections, the fire protection requirements must be met within the design period (for example, 120 years), so as to ensure the overall fire performance of the tunnel structure. If a fire breaks out in the pipeline, the fire will inevitably affect the service life of the waterproof belt assembly. Therefore, the current common practice is to install a fireproof board to meet the firepr...

AI Technical Summary

Problems solved by technology

If a fire breaks out in the pipeline, the fire will inevitably affect the service life of the waterproof belt assembly. Therefore, the current common practice is to install a fireproof board to meet the fireproof requirements of the waterproof belt assembly. However, the existing fireproof board has the following problems: Only fire-proof boards are installed. After testing, the existing fire-proof design meets the fire-proof requirements of two hours, that is, a fire in the pipeline will not affect the waterproof belt components within two hours, and the two-hour fire-proof time limit can no longer achieve effective fire protection. need

At the same time, the two adjacent pipes require longitudinal displacement, and the existing joint structure only has one fireproof board, which cannot meet the displacement requirements

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