Prefabricated bearing platform suitable for large-diameter tubular column foundation of sea bridge and construction method thereof

Abstract

The invention relates to a prefabricated bearing platform suitable for a large-diameter tubular column foundation of a sea bridge and a construction method of the prefabricated bearing platform. The prefabricated bearing platform is of a multi-box lattice type concrete structure, and a box chamber and the large-diameter tubular column foundation are uniform in arrangement. Movable steel bottom plates are arranged at positions, corresponding to tubular columns, of bottom plates, and connecting reinforcing steel ribs are arranged on the inner wall of the prefabricated bearing platform. The construction method includes the steps of prefabricating the bearing platform in a dry dock on the bank side, filling the dry dock with water after the bearing platform is prefabricated, enabling the prefabricated platform to float by itself, opening a lock when the water level inside the dock is flush with the water level of the sea surface, and dragging the prefabricated bearing platform to the position of a pier; filling the prefabricated bearing platform with water so that the prefabricated bearing platform can sink onto a temporary support, and erecting an operating platform on the top of the prefabricated bearing platform; taking down the movable steel plates, conducting tubular column sinking construction, pouring underwater bottom sealing concrete, pumping water, bonding the reinforcing steel ribs, pouring bearing platform concrete, and forming a complete bearing platform structure. According to the prefabricated bearing platform and the construction method, platform erecting expenses can be saved, materials are used completely, construction investment and time are saved, and the prefabricating bearing platform can bear force together with later period bearing platform concrete.

Description

technical field [0001] The invention relates to a prefabricated bearing platform suitable for a large-diameter pipe column foundation of a sea-crossing bridge and a construction method thereof. Background technique [0002] In recent decades, with the rapid development of my country's social economy, a number of new cross-sea bridge projects have been built. The remarkable feature of sea-crossing bridges is that they must adapt to the changing marine environment. In the marine environment, huge wind force, wave force, tidal current impact force, ice pressure and impact force often form controlling conditions. These forces are essentially horizontal loads. The bored pile foundations and driven pile foundations commonly used in inland and inland river environments have small pile diameters, and the largest bored piles in China have a diameter of less than 4m, which is difficult to withstand the huge horizontal force in the marine environment. The diameter of the pipe column...

AI Technical Summary

Problems solved by technology

Due to the harsh offshore environment, the erection and dismantling of the platform requires a lot of machinery and manpower

At the same time, after the concrete pouring of the platform cap, part of the steel structure of the cofferdam cannot be dismantled, resulting in a waste of materials

Therefore, the traditional construction method has high construction costs and requires a lot of machinery and manpower.

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