Construction method of in-water pier and pier top beam section of bare rock riverbed

Abstract

The invention discloses a construction method of an in-water pier and a pier top beam section of a bare rock riverbed. The construction method comprises the steps that first, a trestle is erected; second, a cofferdam is constructed; third, steel protective cylinders are mounted; fourth, cofferdam bottom-sealing construction is conducted; fifth, the cofferdam is anchored, specifically, the steel cofferdam is anchored through a prestressed anchoring device; sixth, bored piles are constructed; seventh, water in the cofferdam is pumped, and the steel protective cylinders are cut off; eighth, an in-water bearing platform is constructed; ninth, a pier body is constructed; and tenth, the pier top beam section is constructed. In the bored pile construction process in the sixth step, the in-water bearing platform construction process in the eighth step, the pier body construction process in the ninth step and the pier top beam section construction process in the tenth step, concrete pumping pipes are used for concrete conveying. The construction method is simple and convenient, the steel cofferdam and pile bodies of the bored piles are connected into a whole in a fastened mode through the prestressed anchoring device, thus the steel cofferdam is anchored on the pile bodies of the bored piles, the steel cofferdam can be effectively prevented from floating, the overturning-resistance safety factor of the steel cofferdam can be increased, and meanwhile long-distance concrete pumping can be easily and conveniently completed by using the trestle.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for piers in water on bare rock river beds and pier top beam sections. Background technique [0002] With the development of the national economy, my country's railway bridge industry is developing rapidly. my country's bridge design theory, construction technology and equipment are catching up with or approaching the world's advanced level, and the construction of long-span sea-crossing and river-crossing bridges continues to increase. During the construction of underwater piers of deep water, high piers, and long-span bridges, when the river bed is a rocky bed with bare rock, the construction of underwater piers is more difficult, and trestle bridges are usually required to be erected. Among them, "deep water" means that the water depth of the bridge foundation is more than 5m~6m, "high pier" means that the height of the bridge pier...

AI Technical Summary

Problems solved by technology

When constructing deep-water bridge piers with a pier height of more than 30 meters and the large-volume 0# beam section supported on the deep-water bridge piers, the construction is very difficult, and the amount of concrete required is large. In addition, the distance between the deep-water bridge piers and the river bank is usually relatively long Therefore, the ultra-long-distance transportation of concrete is also a construction problem

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