Construction method for reconstructing cofferdam anti-seepage system in immersed tube tunnel

Abstract

The invention belongs to the technical field of water conservancy construction, and relates to a construction method for reconstructing a cofferdam anti-seepage system in an immersed tube tunnel. The construction method comprises the steps that remaining sand-filled long pipe bags and a river bed after an original primary cofferdam is destroyed by rush of river are adopted as a base, and stones are thrown at two sides of the base to form an inner side riprap cofferdam body and an outer side riprap cofferdam body; the space between the inner side riprap cofferdam body and the outer outside riprap cofferdam body is filled with clay to form a first-level clay cofferdam body, the inner side riprap cofferdam body, the outer side riprap cofferdam body and the first-level clay cofferdam body form an earth-rock cofferdam, and after the construction of the earth-rock cofferdam, a second-level clay cofferdam body is constructed above the earth-rock cofferdam through filling; and plastic concrete drilling occlusion piles are constructed in the middle part of the first-level clay cofferdam body as the anti-seepage system of the earth-rock cofferdam. According to the construction method, the cofferdam can be quickly reconstructed on the basis of the remaining sand-filled long pipe bags and the river bed remaining after the original primary cofferdam is destroyed by rush of river, the stable earth-rock cofferdam and the anti-seepage system thereof are formed, and remaining civil engineering in the cofferdam is guaranteed to reach the construction condition of no-water operation.

Description

technical field [0001] The invention relates to a construction method for rebuilding a cofferdam anti-seepage system in an immersed tube tunnel, and belongs to the technical field of water conservancy construction. Background technique [0002] The Honggu Tunnel crosses the Ganjiang River and connects the Honggutan New District and the old city on the east bank. It is 1.4km away from the upstream Nanchang Bridge and 2.3km away from the downstream Bayi Bridge. It is an east-west two-way six-lane urban traffic trunk line. The total length of the tunnel is 9.3km, and the section across the river uses immersed tubes with a length of 1329m. The tunnel adopts the design of "rapid river crossing, underwater interchange, multi-point evacuation, and east-west connection". The main line passes through Honggu Middle Avenue and Ganjiang Middle Avenue, crosses Ganjiang River and Jiangxinzhou in a straight line, connects the east bank with an underwater interchange, and sets up a pair of...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the reconstruction of cofferdams in the middle of the river is greatly affected by the hydrological conditions of the river, the construction environment is complex, the construction difficulty is high, and the cofferdams need to be removed and the original riverbed restored. The construction method, whose construction process is simple and controllable, facilitates the rapid reconstruction of the cofferdam and guarantees its durability

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