Cofferdam launching method

Abstract

The invention discloses a cofferdam launching method, and relates to the field of cofferdam construction. The method includes the following steps that A, a launching site is distributed, an air bag and an anchor are distributed on the launching site, a floating box is arranged on the air bag and comprises multiple sections, the interior of each section is provided with a water pipe, a cofferdam is spliced on the floating box, the cofferdam is connected with the anchor through a hawser, and the air bag is inflated after the cofferdam is spliced; B, the hawser is cut off, the cofferdam and the floating box are launched, water is injected into the water pipes until the floating box is separated from the cofferdam and sinks into the water bottom, water injection stops, the position of the cofferdam is changed, and water in each section of the floating box is extracted through the corresponding water pipe until the floating box automatically emerges from the water. When the cofferdam is launched, buoyancy force is provided for the cofferdam through the floating box so that the launching depth can be effectively reduced, and the water depth requirement of a water inlet is reduced; after the cofferdam is launched, the floating box can be separated from the cofferdam by injecting water into the floating box, the water in the floating box is pumped out, the floating box does not need to be salvaged and can automatically emerge from the water, and recycling is convenient.

Description

technical field [0001] The invention relates to the field of cofferdam construction, in particular to a cofferdam launching method. Background technique [0002] Conventional launching methods for double-walled steel cofferdams mainly include: hoisting down the river, sunken ship down the river, air bag method and shipyard’s professional sliding method. In recent years, large-scale double-wall steel cofferdam airbag launching has been widely used in the construction of bridge deepwater foundations. The principle of double-wall steel cofferdam airbag launching is: under the long side well wall with parallel side cofferdam walls, a cylindrical airbag support bracket and cofferdam that can roll forward are arranged, and the bracket and cofferdam rely on the ramp. Under the support of the airbag, the formed gravity component moves quickly forward by itself, slides into the water and floats on its own, and completes the cofferdam down the river in an instant. [0003] Compared ...

AI Technical Summary

Problems solved by technology

[0009] 1. The water depth requirement of the water inlet is high, which needs to be dealt with in advance;

[0010] 2. The bracket falls into the bottom of the water after entering the water and is separated from the cofferdam. It is difficult to salvage the bracket from the bottom of the water, which is not conducive to the recovery of the bracket

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