Fire protection structure of pipe joint joints in immersed tube tunnel

Abstract

The present invention discloses an immersed tunnel pipe joint fireproof structure comprising a waterproof band assembly and a fireproof assembly which are disposed between two adjacent pipelines of animmersed tunnel. The fireproof assembly is spaced from the waterproof band assembly and positioned at the inner side. The fireproof assembly comprises a protection plate assembly comprising a first fireproof plate, a second fireproof plate, a first moving assembly and a second moving assembly, wherein the first fireproof plate is spaced from the second fireproof plate and positioned at the innerside, one end of the first fireproof plate is connected with one pipeline, the other end of the first fireproof plate is movably connected to the other pipeline via the first moving assembly, one endof the second fireproof plate is connected with the one pipeline, and other end of the second fireproof plate is movably connected to the other pipeline via the second moving assembly; a heat insulation member positioned between the first fireproof plate and the second fireproof plate; and a flexible fireproof band positioned between the first moving assembly and the second moving assembly. According to the technical scheme, fireproof time efficiency and displacement requirements can be simultaneously satisfied by the immersed tunnel pipe joint fireproof structure.

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 tunnels constructed by the immersed pipe method, the connection between two adjacent pipes needs to be connected with a waterproof belt assembly (such as a rubber waterstop strip) to prevent external water from penetrating into the pipe through the connection. In addition to meeting the expansion and contraction displacement between the tunnel pipes, the waterproof belt assembly must also meet the fire protection requirements within the design period (for example, 120 years), so as to ensure the overall fire performance of the tunnel. 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 w...

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 the fireproof board is installed. After testing, it can only achieve two hours of fireproofing, that is, the fire in the pipeline will not affect the waterproof belt components within two hours. However, the two-hour fireproofing time can no longer meet the increasing demand for fireproofing.

Therefore, the existing joint structure can no longer meet the actual needs

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