Steel pipe driven pile foundation with steel boxed cofferdam and dual bearing platforms, and construction method of foundation

Abstract

The invention relates to a steel pipe driven pile foundation with a steel boxed cofferdam and dual bearing platforms, and a construction method of the foundation. The upper part of the foundation is the steel boxed cofferdam, the lower part of the foundation is a steel pipe driven pile foundation body, and the steel boxed cofferdam and the steel pipe driven pile foundation body are fixedly connected through the lower bearing platform. The upper bearing platform and a pier base are arranged on the steel boxed cofferdam. A thin-wall shell of the steel boxed cofferdam is filled with concrete, and the bottom of the steel boxed cofferdam is filled with subsealing concrete. The construction method includes the steps that a steel pipe pile is driven into a pier location stratum, the steel boxed cofferdam obtained through manufacturing is transported to the pier location, is positioned accurately and sinks for implantation by injecting water, then pouring of the subsealing concrete of the steel boxed cofferdam and concrete filling in the steel shell are performed, water in the steel boxed cofferdam is pumped out, and the lower and upper bearing platforms are constructed on the water-free condition. The foundation can resist horizontal loads, avoid risks of the sinking construction and shorten the construction period, and is low in manufacturing price, high in efficiency and reliable in quality. The foundation is applicable to bridge foundations and electric tower foundations built in oceans or rivers with large water depth and strong scouring, and can effectively reduce the current force and river-bed scouring.

Description

technical field [0001] The invention relates to a novel deep-water foundation structure form and a construction method thereof, in particular to a steel box cofferdam double cap steel pipe driven pile foundation and a construction method thereof. Background technique [0002] The design and construction of deep-water foundations have always been a difficult point in the engineering field. Commonly used deep-water foundations include pile foundations and caisson foundations. When the water depth is deep, the free length of the pile will increase, and the force on the pile body is very unfavorable, especially for The tower foundation with small vertical load and large horizontal load is even more unfavorable, which can only be overcome by increasing the number of piles, resulting in an increase in project cost; but after the number of piles increases, the water resistance area of ​​the foundation increases, and the water flow force And the scouring of the river bed also increa...

AI Technical Summary

Problems solved by technology

[0002] The design and construction of deep-water foundations have always been a difficult point in the engineering field. Commonly used deep-water foundations include pile foundations and caisson foundations. When the water depth is deep, the free length of the pile will increase, and the force on the pile body is very unfavorable, especially for The tower foundation with small vertical load and large horizontal load is even more unfavorable, which can only be overcome by increasing the number of piles, resulting in an increase in project cost; but after the number of piles increases, the water resistance area of ​​the foundation increases, and the water flow force and the scour of the river bed also increase at the same time, creating new unfavorable factors for the structure

The caisson foundation is also a commonly used form of deep water foundation, but when the geological conditions are relatively poor and the bearing layer is buried deep, the caisson foundation must sink very deep, which is difficult to construct and has a long construction period

[0003] In view of the fact that the existing deep-water foundation forms cannot well meet the actual requirements of the project, in order to solve this problem, it is necessary to carry out innovative designs on the deep-water foundation forms

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