Locking opening structure of steel cofferdam and construction method for locking opening structure

Abstract

A locking opening structure of a steel cofferdam and a construction method for the locking opening structure relate to the field of deep foundation pit or water foundation construction. The locking opening structure comprises an outer steel pipe and an inner steel pipe, wherein the inner steel pipe is sleeved in the outer steel pipe, both the inner steel pipe and the outer steel pipe are provided with a longitudinal opening, and the outer diameter of the inner steel pipe is 1-2mm larger than the inner diameter of the outer steel pipe. The construction method includes the steps: selecting the outer steel pipe and the inner steel pipe, longitudinally cutting each steel pipe to form one opening, and adjusting pipe diameters of the outer steel pipe and the inner steel pipe which are unmatched so that the outer diameter of the inner diameter is 1-2mm larger than the inner diameter of the outer steel pipe; welding the outer steel pipe and the inner steel pipe at the positions of locking openings of two adjacent steel cofferdam components respectively, wherein the opening of the outer steel pipe is opposite to the opening of the inner steel pipe; applying grease mixing materials on the inner wall of the outer steel pipe and inserting the inner steel pipe into the outer steel pipe 1; and inserting and piling the steel cofferdam without performing grouting and filling sealing materials at the locking openings, so that construction of the steel cofferdam can be quickly completed, and good sealing effect is achieved.

Description

technical field [0001] The invention relates to the field of deep foundation pit or underwater foundation construction, in particular to a lock structure of a steel cofferdam and a construction method thereof. Background technique [0002] The lock steel cofferdam used in existing large-scale deep foundations or foundations in water is widely used due to its simple construction method and low cost investment. However, the water-stopping problem at the lock of the existing steel cofferdam has not been well solved. It is often necessary to grout the lock or fill it with other water-stop materials after the steel cofferdam components are inserted. Due to the small working space of the lock , and the construction of underwater grouting or filling of water-stop materials is difficult, so it will affect the construction progress; in addition, this kind of lock structure usually needs to put clay, sawdust, slag and other mixtures outside the lock when the cofferdam is pumped Water...

AI Technical Summary

Problems solved by technology

However, the water-stopping problem at the lock of the existing steel cofferdam has not been well solved. It is often necessary to grout the lock or fill it with other water-stop materials after the steel cofferdam components are inserted. Due to the small working space of the lock , and the construction of underwater grouting or filling of water-stop materials is difficult, so it will affect the construction progress; in addition, this kind of lock structure usually needs to put clay, sawdust, slag and other mixtures outside the lock when the cofferdam is pumped Stop water, otherwise it will not be able to achieve a better water stop effect

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