Cofferdam and hoisting descending construction method thereof

Abstract

The invention belongs to the field of bridge engineering, and particularly discloses a cofferdam. The cofferdam comprises side plates and inner supports. The side plates are connected with the inner supports. The side plates are of a double-wall structure and comprise an outer wall plate and an inner wall plate. A plurality of first holes are arranged in the outer wall plate, a plurality of secondholes are arranged in the inner wall plate, and a second hole closing mechanism is further arranged on the inner wall plate. The invention further discloses a cofferdam hoisting and descending construction method. The method comprises the following steps that the cofferdam is transported to a bridge access water area, and the cofferdam is lifted and placed on a distribution beam at the top of steel protection cylinders in a lifting mode; the plane position of the cofferdam is adjusted; descending the whole cofferdam to the designed elevation; and limiting guide devices are arranged between the protection cylinders and the side plates of the cofferdam, so that the wave force borne by the cofferdam can be borne by the main pile foundation, and the structure and the construction safety of the cofferdam can be guaranteed. The method can meet normal construction of the on-site cofferdam in a complex marine environment and can accurately put down the site. The cofferdam and the hoisting anddescending construction method of the cofferdam has the advantages that the offshore construction work efficiency is improved, the operation safety risk is reduced, the overall working procedure construction time is saved, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of bridge engineering. Background technique [0002] The cofferdam is used as the surrounding water structure of the cap platform in the water. It is installed in the later stage of the pile foundation construction, and the water is pumped after the bottom is sealed to provide a "dry environment" for the cap platform construction. The construction of long-span bridges between rivers and straits has become a part of bridge construction. a trend. However, when the cofferdam is hoisted and lowered for construction in a complex marine environment, due to climate change, strong wind, high wave height, and turbulence, the cofferdam needs to withstand a huge wave force in addition to the current force equivalent to that of a conventional inland river. However, if conventional lowering methods and measures are adopted, the hoisting and lowering of the cofferdam will be affected, resulting in great difficulty in low...

AI Technical Summary

Problems solved by technology

However, when the cofferdam is hoisted and lowered for construction in a complex marine environment, due to climate change, strong wind, high wave height, turbulence, etc., the cofferdam needs to withstand a huge wave force in addition to the current force equivalent to that of a conventional inland river. , if conventional lowering methods and measures are adopted, the hoisting and lowering of the cofferdam will be affected, resulting in great difficulty in lowering alignment

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