Opening Connection Method of Undersea Tunnel and Riser

Abstract

The invention provides a method for opening a subsea tunnel and a riser, which comprises the following steps: 1) prefabricating the riser, pouring low-grade plugging concrete at the bottom of the riser, and vertically planting the riser at a designated position Designate the elevation on the seabed; 2) carry out the construction of the subsea tunnel so that the subsea tunnel is perpendicular to the riser in the horizontal direction and pass through the bottom of the riser; 3) open holes in the steel pipe sheet at the connection position directly below the riser in the subsea tunnel, and chisel out The plain concrete under the pipe at the bottom of the riser; 4) The outsourcing steel pipe at the bottom of the riser and the steel pipe sheet at the opening of the subsea tunnel are welded together by connecting steel plates to realize the connection between the subsea tunnel and the riser; 5) Chiseling and filling The plain concrete is blocked in the pipe at the bottom of the riser to realize the connection between the subsea tunnel and the riser. Compared with the prior art, the present invention can reliably connect the subsea tunnel with the riser, realize water intake and drainage through the subsea tunnel, and meet the national marine environmental protection requirements.

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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