Construction method for rock riverbed bearing platform in water

Abstract

The invention discloses a construction method for a rock riverbed bearing platform in water. The construction method includes the steps of construction of a cofferdam, transfer of protective steel canisters to a lower level, bottom sealing construction of the cofferdam, construction of drilling piles, water extraction inside the cofferdam and excision and removal of the protective steel canisters, anti-drainage construction and construction of the bearing platform, wherein during the anti-drainage construction, an anti-drainage structure is constructed inside the steel cofferdam, the anti-drainage structure includes a water-permeable layer, a bottom water-separating layer and lateral water-separating layers, and the bottom water-separating layer is connected with the four lateral water-separating layers to form an integrated type water separating layer; during the construction of the bearing platform, molding construction is conducted on the bearing platform in the water inside the integrated type water separating layer. According to the construction method for the rock riverbed bearing platform in the water, by drilling multiple guide holes in hard rock where the drilling piles are located from top to bottom, sifter holes are formed in the hard rock where the drilling piles are located to increase a rock fissure surface; moreover, by adopting a prestress anchor device to fixedly connect the steel cofferdam with the drilling pies in an integrated mode, so that the pile foundation construction progress and construction quality can be effectively ensured, and meanwhile, the integrated type water separating layer is arranged on the molding pile foundation after construction and can effectively ensure the concrete pouring quality of the bearing platform.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a method for constructing a rocky river bed water bearing platform. 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. The deep-water foundation with a size of 30.25m×19.75m×5m for the main pier cap is currently the largest deep-water foundation for railway projects on inland waterways. The use of double-wall steel cofferdams for underwater foundation construction has become the main method for large-volume deep-water foundation construction for modern long-span bridges. The construction of double-wall steel cofferdams needs to adapt to speci...

AI Technical Summary

Problems solved by technology

Moreover, when the caps are large in size and buried deep, the caps are located below the river bed surface, and the river bed has no covering layer and the bedrock is exposed, the construction of the caps in water is very difficult.

Images