Method for realizing flat turning and watering of double-walled steel cofferdam by utilizing air bags

Abstract

The invention discloses a method for realizing flat turning and watering of a double-walled steel cofferdam by utilizing air bags and relates to a construction method of a foundation in water in bridge engineering. The method comprises the following steps: arranging at least two supporting plates below the cofferdam, and arranging N air bags below each supporting plate; obliquely placing the air bags, and enabling the air bag at the frontmost end which is close to the water entry end of the cofferdam to form an included angle of 90 degrees plus alpha with the center line of the cofferdam, wherein the alpha is the angle which needs to rotate for watering the cofferdam; enabling the air bag at the rearmost end which is far away from the water entry end of the cofferdam to be vertical to the center line of the cofferdam, and sequentially arranging the other air bags from the frontmost end to the rearmost end according to 90 degrees plus alpha-(n-1) alpha / (N-1) with the center line of the cofferdam, wherein n equals 1, 2,...N; gradually releasing a steel wire rope and enabling the cofferdam to move obliquely along the placement direction of the air bags; and cutting off the steel wire rope at the part which is 15-20m away from a river entry mouth of the cofferdam and realizing the water entry of the cofferdam. By adopting the method, the flat turning problem of the cofferdam can be solved; when a larger obstacle exists on the riverside or a processing place is not dead against a river mouth, the cofferdam can be flatly turned to the position which is dead against the river mouth and the water entry of the cofferdam is realized.

Description

technical field [0001] The invention relates to underwater foundation construction of bridge engineering, in particular to a method for realizing double-walled steel cofferdams to turn horizontally down a river by using an air bag. Background technique [0002] Double-wall steel cofferdam is a water-retaining or earth-retaining structure used for the construction of the cap platform in the water during the foundation construction of the bridge. The method of cofferdam first and then drilling is a commonly used method in the construction of double-wall steel cofferdams. When adopting the method of cofferdam first and then drilling, the bottom section or full-height cofferdam is first manufactured in the processing plant, and then the cofferdam is lowered into the river . Usually, when the cofferdam is lowered down the river using the airbag method, the processing site needs to be located close to the river, so that the cofferdam can be successfully dragged down the river usi...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a method of using airbags to realize the horizontal rotation of double-walled steel cofferdams down the river, so as to solve the problem of horizontal rotation of cofferdams. When the site is not directly facing the estuary, the cofferdam is turned to the position facing the estuary to realize the water entry of the cofferdam

Images