Bottom-adjustable combined steel cofferdam structure and construction method thereof

Abstract

The invention provides a bottom-adjustable combined steel cofferdam structure. The bottom-adjustable combined steel cofferdam structure comprises an upper cofferdam, a lower cofferdam, a water-stop sheet and a plurality of sets of steel sheet piles which are sequentially and tightly connected; long bolts are welded to the middles of the steel sheet piles; the upper portions of the long bolts penetrate through the upper cofferdam and the water-stop sheet, and the lower portions of the long bolts penetrate through the lower cofferdam; and the steel sheet piles slide up and down through movement of the long bolts in the vertical direction. According to the bottom-adjustable combined steel cofferdam structure, the upper cofferdam, the lower cofferdam and the steel sheet piles are connected with one another, the deviation of the upper steel cofferdam and the gap between the cofferdams and the riverbed rock surface are adjusted by fully utilizing relative sliding between the steel sheet piles and the cofferdams, and the technical problems that deviation of the steel cofferdams is difficult to correct, and bottom sealing concrete is diffused are effectively solved; and meanwhile, the steel cofferdams do not need to be cut underwater after construction is completed, the construction risk and difficulty are greatly lowered, and remarkable economic and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a combined steel cofferdam structure with an adjustable bottom and a construction method thereof. Background technique [0002] At present, large-scale steel cofferdams have been widely used in the construction of deep-water bridges. However, when they are applied to deep-water steep rock surfaces without overburden layers, the back-sealing concrete cannot be poured well due to the large gap between the bottom of the cofferdam and the rock surface. , The overall posture of the cofferdam is not easy to adjust, and the cofferdam superstructure is difficult to recover and other technical problems, which make the construction of the bridge foundation more difficult, the construction cost increases, and the construction quality is difficult to guarantee. Contents of the invention [0003] The purpose of the present invention is to solve the above problems by providing a ...

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Problems solved by technology

[0002] At present, large-scale steel cofferdams have been widely used in the construction of deep-water bridges. However, when they are applied to deep-water steep rock surfaces without covering layers, the back-sealing concrete cannot be poured well due to the large gap between the bottom of the cofferdam and the rock surface. , The overall posture of the cofferdam is not easy to adjust, and the cofferdam superstructure is difficult to recover and other technical problems, which make the construction of the bridge foundation engineering more difficult, the construction cost increases, and the construction quality is difficult to be guaranteed.

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