Steel trestle double-wall steel cofferdam transportation and rapid assembling and lowering construction method

Abstract

The invention relates to a steel trestle double-wall steel cofferdam transporting and rapid assembling and lowering construction method. The method comprises the steps that firstly, a steel trestle is erected; secondly, the wall body of the double-wall steel cofferdam is prefabricated and machined in a blocking mode; thirdly, the steel casing used in pile foundation construction is lengthened; 4, erecting and assembling a bracket on the steel casing by using profile steel at the height of the steel casing close to the water surface; fifthly, the steel cofferdam is transported to the site in a blocking mode through a steel trestle, and a bottom section cofferdam is assembled on the assembling support; sixthly, a lowering system is installed on the top of the steel casing; seventhly, the bottom section cofferdam is integrally lifted, and the assembling supports are dismantled; eighthly, the bottom section cofferdam is integrally lowered, and the bottom section cofferdam automatically floats on the water surface; ninthly, the wall body of the upper section cofferdam is hoisted in a blocking mode, and the upper section cofferdam is heightened on the bottom section cofferdam; and tenthly, water is injected into the cofferdam to sink to the designated elevation. The large-scale double-wall steel cofferdam assembling and lowering precision and convenience are improved, and the large-scale double-wall steel cofferdam assembling and lowering method has specific application scenes and belongs to the technical field of building construction.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for transporting a double-walled steel cofferdam of a steel trestle bridge and fast assembling and lowering. Background technique [0002] With the rapid development of my country's economic construction, the construction of large-scale bridges in my country has made a huge leap, and bridges across rivers and seas have also developed rapidly. In order to realize the construction of deep-water bridge foundations, large-scale double-walled steel cofferdams have been widely used. . In the years of bridge engineering construction, several types of commonly used cofferdam forms have been explored for water isolation and dry operation in rivers and oceans. Among many types of cofferdams, double-walled steel cofferdams have high strength, high rigidity, high stability and strong water-stopping ability, and can be widely used in deep water and rapid waters. How...

AI Technical Summary

Problems solved by technology

Because of its heavy weight and volume, the construction process of large double-walled steel cofferdams is relatively complicated. In open and deep waters, it is often assembled on the shore as a whole. It is lowered to the water surface using air cushions, float valves, etc., and then large transport ships are used to carry the steel cofferdams through the waterway. The cofferdam is transported to the site, and the steel cofferdam is adjusted by using large floating cranes, water gantry cranes, etc., and lowered underwater. However, this method has high requirements on the topography on the shore and the navigation of the river. The steel cofferdam processing site must be close to the river bank, and The elevation of the processing plant needs to be close to the water surface elevation, so that it can be moved directly into the water after the processing is completed; the rivers where many projects are located are narrow, the water flow is turbulent, and the water drop is large, and it is difficult for large-scale marine equipment to enter such sites; and the manufacturing cost and leasing cost of large-scale marine equipment extremely expensive

In many projects, affected by terrain and hydrological factors, it is difficult to realize the plane transportation of the entire large cofferdam

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