Seabed tunnel and stand pipe opening connection method

Abstract

The invention provides a seabed tunnel and stand pipe opening connection method. The method includes the following steps that (1) a stand pipe is pre-fabricated, low-grade blocking plain concrete is poured to the bottom of the stand pipe, and the stand pipe is vertically planted in a seabed assigned elevation in an assigned position; (2) construction of a seabed tunnel is performed, and the seabedtunnel is perpendicular to the stand pipe in the horizontal direction and passes through the bottom of the stand pipe; (3) a hole is formed in a steel pipe piece in the connecting position, under thestand pipe, of the seabed tunnel, and the under-pipe blocking plain concrete at the bottom of the stand pipe is chiseled away; (4) an external-wrapping steel pipe at the bottom of the stand pipe is welded to the holed steel pipe piece of the seabed tunnel through a connecting steel plate, and connection of the seabed tunnel and the stand pipe is achieved; and (5) in-pipe blocking plain concrete which fills in the bottom of the stand pipe is chiseled away, and communication between the seabed tunnel and the stand pipe is achieved. Compared with the prior art, the seabed tunnel can be reliablyconnected with the stand pipe, water taking and drainage is achieved through the seabed tunnel, and the requirement of the national marine environment protection is met.

Description

technical field [0001] The invention belongs to the fields of civil engineering tunnel shield construction and sea intake and drainage outlet production, and more specifically relates to an opening connection method between a subsea tunnel and a standpipe. Background technique [0002] Coastal nuclear power plants usually use seawater as the final heat sink. Existing nuclear power plants generally use open water and open channels to achieve water intake and drainage. The method of extracting open drains will no longer exist, and secretly extracting hidden drains will become the mainstream direction of power station drainage. [0003] In the previous construction, I have never encountered a construction scene where the tunnel and the riser opening are connected on the seabed. It is similar to the construction of the "down-insert" water intake riser adopted by the underwater diversion tunnel of a certain project on the Yangtze River. technology. The construction technology i...

AI Technical Summary

Problems solved by technology

However, the cost of using "freezing technology" in deep sea construction is very high, and the possibility of successful implementation is unknown. In addition, the construction of the water intake riser is on the critical path, which is not conducive to shortening the construction period

Therefore, the construction technology of "down-insertion" water intake riser cannot meet the requirements of nuclear power plant intake and drainage tunnel construction.

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