Double-wall steel cofferdam water floating state connection construction method

Abstract

The invention relates to a double-wall steel cofferdam overwater floating state connection construction method, which relates to the technical field of cofferdam construction, and comprises the steps that a plane adjusting device is arranged on the inner side of a bottom layer cofferdam section, an end part sealing plate is arranged at the end part of the bottom layer cofferdam section, and the bottom of the end part sealing plate is connected with the bottom of the bottom layer cofferdam section; the height of the end sealing plate is not smaller than the waterline value when the bottom layer cofferdam section is lowered to the water surface. And the bottom layer cofferdam sections are aligned with the peripheries of the multiple steel protection cylinders at the preset positions to be lowered, the plane adjusting devices are submitted, and temporary connecting pieces are arranged between the adjacent bottom layer cofferdam sections. A top cover plate is arranged on the tops of every two adjacent end sealing plates, and splicing seams above the top cover plates are welded. And subsequent splicing and lowering are carried out. Large-tonnage installation equipment is not needed, water prevention is achieved by sealing the part, located below the waterline, of the bottom layer cofferdam section, the part below the waterline does not need to be welded, equipment funds can be saved, meanwhile, cofferdam construction procedures are reduced, and safety, convenience, economy and controllability are achieved.

Description

technical field [0001] The present application relates to the technical field of cofferdam construction, in particular to a construction method for floating connection on water of a double-walled steel cofferdam. Background technique [0002] For large-span bridges spanning rivers, the pier and column foundations are usually set in the river course, and double-wall steel cofferdams are required to be used as water-stop structures for foundation construction during foundation construction. And several layers of annular horizontal trusses are welded, which are required to be watertight. There are multiple cabins inside the double-walled steel cofferdam, which are used to install the steel casing at the corresponding position in the cabin during installation. When the assembled double-walled steel cofferdam is installed, it is necessary to control the plane position when it is lowered, so that each cabin is sleeved on the pre-set steel casing. The double-walled steel cofferdam...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the second method is that it is necessary to set up a cofferdam assembly platform and a large-tonnage lowering suspension system. It is difficult to ensure the accuracy of the plane position when the cofferdam is lowered as a whole, and it is difficult to install all the pre-set multiple steel casings at the installation position. Therefore, this method is only applicable to the case where the cofferdam structure is small and the conditions of transportation and lifting equipment are good, and since each section of the double-wall steel cofferdam needs to be transported to the cofferdam The assembly platform is assembled and then lowered, and the construction process is relatively complicated

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