Deep-water shallow-covering-layer full-rock-socketed bridge foundation construction method

Abstract

The invention discloses a deep-water shallow covering layer full-rock-socketed bridge foundation construction method which is sequentially carried out according to the following steps that firstly, a steel trestle and a steel platform are built on water, and then a lock catch steel pipe pile cofferdam is constructed outside the side boundary of a designed bearing platform; pile foundation equipment and constructing pile foundations are installed on a steel platform, hole guiding and re-vibration are synchronously conducted on the lock catch steel pipe pile cofferdam, and a pipe and a hole are filled with fillers at a certain height to solidify the bottom of the cofferdam; a temporary platform is erected through a gap between the steel trestle and the steel platform, grouting equipment is installed, and curtain grouting and water stopping are conducted on shallow coverage; the steel platform in the steel cofferdam is removed, water is pumped, and purlin supports are installed step by step until a water-free operation environment is formed in the cofferdam; a steel casing for pile foundation construction is cut off, excavation equipment is lowered, and a shallow covering layer and soft stone are cleaned; and a construction intercepting ditch is used for intercepting water, if water leaks in the cofferdam, plugging is conducted in time, and curtain grouting water stopping and the like are conducted in the cofferdam.

Description

technical field [0001] The invention relates to the technical field of bridge foundation construction, in particular to a construction method for a deep-water shallow overburden fully rock-socketed bridge foundation. Background technique [0002] my country's bridge engineering construction level has been among the top in the world, and it can cross various complex obstacles such as valleys, rivers, lakes and seas, and has achieved brilliant achievements. When some bridges cannot cross the river due to structural limitations, it is necessary to set up pier foundations in the water to meet the span requirements. When setting up pier foundations in water, it is necessary to meet the flood control assessment requirements such as water blocking, backwater, and scour, and if it crosses a channel, it must also meet the navigation guarantee requirements. There is an existing bridge foundation. In order to meet the requirements of flood control and navigation, the bridge foundation...

AI Technical Summary

Problems solved by technology

However, underwater blasting construction is difficult, with high safety risks and high costs. The progress of cleaning the foundation pit is uncontrollable due to the influence of silting. At the same time, the amount of steel used in the steel cofferdam is large, and the turnover of materials is not strong. It requires an assembly site and a large amount of concrete for the bottom cover , the overall cost is high, and the overall floating and lowering of the steel cofferdam has high requirements on ship machinery equipment and navigation conditions, while the bulk steel cofferdam not only uses a large amount of materials, but also has a slow construction progress

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