Construction method for major-diameter hollow pile sinking foundation

Abstract

The invention relates to a construction method for a major-diameter hollow pile sinking foundation. A steel casing driven into the outer wall through a vibrating pile driving hammer serves as an exterior formwork poured through pile foundation concrete; a dredging pipe is installed in the casing, high pressure jetting water is used in a matched manner for dredging, a coverage layer in the casing is removed, a pile body reinforcement cage is bound on the land, a temporary steel casing penetrates into the reinforcement cage, and the reinforcement cage and the internal temporary steel casing are lifted and installed at the pile position and fixed to the outer wall steel casing; pile foundation concrete is poured with an underwater concrete pouring process; when the strength of the pile foundation concrete reaches 60% of the design strength, the temporary steel casing is pulled out; and pile foundation concrete curing is continuously carried out until the design strength value is obtained. The reinforcement cage and the internal temporary steel casing are manufactured in a segmentation manner, and on-site lengthening is achieved. By means of the construction method, special machines are not needed, and operation can be completed only through the routine technique; on the premise that the stress requirement is met, the using amount of the pile foundation concrete is small, the building cost of projects is low, construction is safe and reliable, the application scope is wide, and the pile forming diameter can reach more than 20m.

Description

technical field [0001] The invention relates to a construction method of a large-diameter hollow pile foundation. Background technique [0002] In recent decades, with the rapid development of my country's social economy, a large number of bridge projects across rivers and seas have been built. These large-scale bridge projects will inevitably encounter the construction of deep water foundations. The most common deep-water foundation is the pile foundation, and the ordinary pipe pile foundation is a prefabricated structure, which is driven into the site or constructed by static pressure. As the span of the bridge continues to increase, the load on the foundation also increases, requiring the foundation to have greater bearing capacity and stiffness. Large-diameter pile foundations have high bearing capacity and high rigidity. It can reduce the total number of pile foundations and shorten the period of foundation construction. Judging from the recent construction of long-...

AI Technical Summary

Problems solved by technology

However, due to the limitation of mechanical equipment and technological level, the diameter of the pile is less than 5m no matter it is a bored pile foundation or a hollow pipe pile foundation.

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