Construction method of steel cofferdam used for reinforcing underwater pier

Abstract

The invention relates to a construction method of a steel cofferdam used for reinforcing an underwater pier, which utilizes a steel frame hung on a bridge girder body to complete the on-site assembly and the overall subsidence construction of the steel cofferdam used for reinforcing the underwater pier and comprises the following construction steps of: A. designing and processing the steel frame according to the characteristics of the cross section of the pier with need of reinforcement and the characteristics of the steel cofferdam; B. arranging a hanging strip on the girder body at the top of the pier with need of reinforcement and completing the installation of the steel frame; C. using a crane to hoist and hang the cross-bridge directional steel cofferdam block sections block by block on the steel frame; D. using the crane to hoist and hang the bridge directional steel cofferdam block sections block by block on the steel frame; E. completing the connection among the steel cofferdam block sections hung on the steel frame and arranging guide devices on the inner wall of the steel cofferdam; F. arranging a pulley block used for the sinking of the steel cofferdam on the steel frame and the steel cofferdam; and G. starting the pulley block used for the sinking of the steel cofferdam and leading the steel cofferdam to sink in place. The method resolves the difficult problem in the construction of the steel cofferdam used for reinforcing the underwater pier.

Description

Technical field: [0001] The invention belongs to the field of bridge construction, and in particular relates to a construction method of a steel cofferdam for underwater pier reinforcement. Background technique: [0002] Due to design defects, construction quality accidents, earthquakes or other natural disasters, ship collisions and overloading, more and more completed bridges need to be reinforced. If there are cracks or other diseases in the underwater pier body of the bridge pier that has been built, it is best to first install a steel cofferdam within a certain range around the pier with problems, and then pour water between the outer wall of the pier and the steel cofferdam. Concrete is used to reinforce it. In traditional construction, the steel cofferdam is used as a temporary facility for the underwater foundation construction of the bridge, and is sunk in place before the construction of the bridge structure. Under normal circumstances, the sinking construction o...

AI Technical Summary

Problems solved by technology

The construction of the steel cofferdam for pier reinforcement is affected by the completed bridge, and the available construction space is very limited. In this case, the method of splicing and sinking the steel cofferdam for pier reinforcement with a large floating crane cannot be implemented

The construction method of inserting steel pipe piles around the pier foundation that needs to be reinforced, and then setting up a construction platform on the water to carry out the overall subsidence of the steel cofferdam on site is not only expensive but also has a long construction period. Frequent vibrations during construction cause secondary damage to bridges that have problems

It can be seen that the traditional steel cofferdam construction method cannot be implemented when constructing steel cofferdams for underwater pier reinforcement.

How to safely and efficiently complete the construction of steel cofferdams for underwater pier reinforcement remains an unresolved problem

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