Method for installing steel cofferdam by the aid of pier supporting frame

Abstract

The invention discloses a method for installing a steel cofferdam by the aid of a pier supporting frame. The method comprises that a lifting frame and a guide frame are installed on a pier, the steel cofferdam is divided into a plurality of steel cofferdam sections according to actual conditions, and each of the steel cofferdam sections is divided into a plurality of steel cofferdam units with chamfer angles. During construction, the lifting frame which is located at the top of the pier or on one side of the pier and is used for lifting the steel cofferdam is installed firstly, the guide frame which is located on one side of the pier and can be used for guiding and positioning the underwater steel cofferdam is installed, finally, steel cofferdam units are lifted horizontally and then adjusted to be vertical, and the steel cofferdam having a self-balancing capability can be formed through lifting and assembly of sections and units by the aid of the lifting frame and the guide frame in such a sequence that upstream steel cofferdam units and downstream steel cofferdam units are installed and then steel cofferdam units in the middle are installed. The method can effectively solve the problems of assembly, positioning and sinking of the steel cofferdam in a narrow and small space on the condition that no large lifting device is provided, and the method has the advantages of being good in adaptability, simple in structure, convenient to manufacture, good in operability, safe, reliable, good in economical efficiency, good in application prospect and the like.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a simple method for installing a steel cofferdam by means of a bridge pier support frame. Background technique [0002] During the maintenance and reconstruction of bridge piers in water, a dry working environment is required, and the common method of forming a dry working environment is to use cofferdams. The types of cofferdams are earth cofferdam, earth bag cofferdam, steel sheet pile cofferdam, reinforced concrete sheet pile cofferdam and steel cofferdam. [0003] Under complex conditions (small clearance under the bridge, pebble river with high flow velocity), soil cofferdams and soil bag cofferdams cannot meet the construction requirements when using pier maintenance and reconstruction; steel sheet pile cofferdams and reinforced concrete sheet pile cofferdams The sinking of the weir requires a certain clearance height, which also cannot meet the requirements; therefore, s...

AI Technical Summary

Problems solved by technology

[0003] Under complex conditions (small clearance under the bridge, pebble river with high flow velocity), soil cofferdams and soil bag cofferdams cannot meet the construction requirements when using pier maintenance and reconstruction; steel sheet pile cofferdams and reinforced concrete sheet pile cofferdams The sinking of the weir requires a certain clearance height, which also cannot meet the requirements; therefore, steel cofferdams become the first choice

[0004] Steel cofferdams are widely used in new bridge construction projects, and the construction technology is mature. However, when they are used for the maintenance and reconstruction of bridge piers in shallow rapids, the installation of steel cofferdams outside bridge piers is often subject to complex conditions (no large hoisting facilities, small Clearance under the bridge or large flow rate or construction requirements environmental protection) restrictions, need to be improved on the basis of the existing steel cofferdam construction method to achieve

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