Floating arch cofferdam and construction method

Abstract

The invention provides a float arch cofferdam which can float and submerge in water as well as is convenient for being dragged and can be used for a plurality of times. The invention also provides the construction method of the float arch cofferdam. The float arch cofferdam is mainly used for maintaining and rebuilding various large dams and water conservancy projects, which can be utilized to surround the upstream face of the large dam, keeps off the water in a reservoir and discharge the downstream water of a cofferdam; dry operating environment is created on the upstream face of the large dam; the cofferdam is made by adopting steel plates and reinforced concrete material, the shape of the circle arch cofferdam lead the outer wall to bear upstream water pressure, but the outer wall does not need to be too thick, and due to the design of more than two cabins on the transverse surface, the posture of the cofferdam in the water can be more flexibly adjusted by controlling the water injection and water draining in all the cabins when in floating. The construction of the cofferdam can be carried out on the water, but a foundation bed is sealed with the main body of the cofferdam to stop water so as to collect the sewage generated in the construction; after the construction, the sewage is discharged after being purified and treated, thus reducing pollution to water quality. In addition, when in construction, the reservoir does not need emptying and only needs to lower the water level properly, thereby avoiding the loss caused by emptying the reservoir.

Description

technical field [0001] The invention relates to a water conservancy cofferdam, and in particular provides a floating arch cofferdam which can be floated and sunk in water, is convenient to move, and can be used multiple times and its construction method. Background technique [0002] "(The Seventeenth International Dam Conference Papers Translation Collection" provides a kind of semi-circular steel cylinder floating cofferdam 1 with a diameter of 2.75 meters as shown in Figure 1 used in the repair of Mactaquac Power Station in Canada and The construction method is that it is made of thin steel plates, and the interior is reinforced with steel plates. A grouting bag 2 is installed on both ends of the cofferdam 1. When the cofferdam and the dam are aligned, concrete is poured into the grouting bag to stop water, and then use The water pump 4 at the bottom of the cofferdam pumps out the water between the cofferdam and the dam 3 to form a dry work construction area. The cofferda...

AI Technical Summary

Problems solved by technology

[0004] Although the first type of steel cylinder cofferdam has the advantages of convenient installation, less underwater operations, and multiple uses, but because it is welded by all steel materials, this type of cofferdam will show its rigidity when the span is large Insufficient, easy deformation and engineering difficulty and high cost and many other disadvantages

[0005] Another kind of concave concrete cofferdam, there is a row of 20 cabins in the reinforced concrete cofferdam. Because it adopts a concave shape structure, the front of the cofferdam must be able to bear strong water pressure, so the thickness of the reinforced concrete There are high requirements for quality and quality, and because the 20 cabins used to control the attitude of the cofferdam are distributed in a single row during hauling in water, the cofferdam is easy to roll over during hauling, and it takes a lot of time to adjust the cofferdam when installing at the next location attitude, there are still many disadvantages such as difficult engineering and high cost

[0006] In addition, neither of the above two cofferdams involves the treatment of underwater foundations, and their application range is relatively limited

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