Deep sea bare rock pier protection barrel, positioning pile, underwater cofferdam integrated platform and construction method

Abstract

The invention relates to an integrated platform of a deep sea bare rock pier guard barrel, a guide pile and an underwater cofferdam and a construction method thereof. The structure of the integrated platform is as follows: the steel guard barrel and a steel sleeve are connected into a whole; the guard pile is inserted into the steel sleeve; side plates of the cofferdam are arranged along the outer ring at the bottom of the platform to form a closed bin body which is divided into a plurality of small bins; bottoming concrete is filled into each small bin; and bin baffle plates are supported on trusses of the side plates of the cofferdam. The construction method comprises the following working procedures of manufacture of the platform, lifting and conveying, descending, leak stoppage, pouring of bottoming concrete, tapped arrangement and so on. The construction method meets the requirements of construction of a bridge foundation of a bare rock pier of a bridge spanning the sea, and the requirement of the steel protective barrel and the guard pile on the pile stabilizing depth, is safe and stable to construct the prior guard pile platform, improves the construction efficiency due to overall assembly of the platform, controls the verticality and the horizontal deviation of the platform, has high construction precision, avoids overall stability of the platform and leakage stoppage of a bottom opening of the protective barrel, and provides convenient conditions and technological guarantee for bridge construction in sea areas with severe construction conditions.

Description

technical field [0001] The patent of the present invention relates to the deep-sea bare rock pier casing, positioning pile, underwater cofferdam integrated platform and construction method used in the construction of the sea-crossing bridge and the bare rock pier foundation, and belongs to the technical field of bridge foundation construction of the cross-sea bridge . Background technique [0002] For bridge foundation construction in the deep-sea field, for bare rock piers, especially the undulating rock surface and large inclination, the inclination angle of the rock layer is approximately 70°, and the bedrock is slightly weathered granite with high strength. +Construction technologies such as "inserting steel casing scheme", "gravity foundation", "caisson scheme", "double-wall steel cofferdam scheme" are difficult to meet the requirements of bridge foundation construction for cross-sea bridges with bare rock piers. For construction piers where swirling flow, swell, and u...

AI Technical Summary

Problems solved by technology

[0002] For bridge foundation construction in the deep-sea field, for bare rock piers, especially the undulating rock surface and large inclination, the inclination angle of the rock layer is approximately 70°, and the bedrock is slightly weathered granite with high strength. +Construction technologies such as "inserting steel casing scheme", "gravity foundation", "caisson scheme" and "double-wall steel cofferdam scheme" are difficult to meet the requirements of bridge foundation construction for cross-sea bridge bare rock pier

For construction piers where swirling flow, swell, and undercurrent phenomena exist, and the maximum flow velocity exceeds 3.0m / s, the foundation construction of the above-mentioned bridge piers is extremely difficult, and the positioning piles and steel casings are inserted, and there are only insufficient piles at local piles. The covering layer of 0.5m cannot meet the requirements of the steel casing and positioning piles for the depth of the pile, and the construction of the conventional positioning pile platform cannot be carried out at all, and it is difficult to ensure the safety and stability of the structure before the completion of the construction platform.

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