Method for closing bottom of steel boxed cofferdam and gaps among river beds

Abstract

The invention discloses a method for closing the bottom of a steel boxed cofferdam and gaps among river beds. The method comprises the following steps: a, the steel boxed cofferdam is assembled on a shore side; b, retaining beams are mounted in areas needing to be closed and keep a certain distance from the outer wall of the cofferdam, and connecting plates are mounted between the retaining walls and the outer wall of the cofferdam; c, a plurality of movable inserting plates are mounted between the retaining beams and the outer wall of the cofferdam and hung on the outer wall of the cofferdam by using steel wire ropes, and adjacent movably inserting plates are clung to each other; d, the cofferdam is moved to designed positions of the river beds; and e, the steel wire ropes for hanging the movable inserting plates are untied, the movable inserting plates are lowered, and then the bottom of the cofferdam and the gaps among the river beds are closed. The method has the advantages that the plugging effect is good, the ability of adapting to water flow is strong, the plugging speed is high, the operation is convenient and the safety is high, and has not need to be operated by a diver through diving into the water bottom.

Description

【Technical field】 [0001] The invention relates to a method for closing the gap between the bottom of a steel casing cofferdam and a river bed. 【Background technique】 [0002] In the prior art, during the construction of bridge foundations with underwater low-pile caps without covering layer, the size of the casing cofferdam is relatively small, and there are three methods for sealing the gap between the bottom mouth of the cofferdam and the uneven riverbed: one is to adopt The bottom blade foot is made into a high and low blade foot method suitable for the shape of the rock surface (river bed). Another method is to adopt the method of divers’ underwater sandbags to be piled up for sealing or throwing stone dragon sandbags outside the cofferdam. To block. The high and low blade foot method needs to accurately measure the shape of the river bed, which is difficult and time-consuming, and there will still be gaps; the diver's underwater plugging method is limited by the water ...

AI Technical Summary

Problems solved by technology

The high and low blade foot method needs to accurately measure the shape of the river bed, which is difficult and time-consuming, and there will still be gaps; the diver's underwater plugging method is limited by the water depth, takes a long time, has a large workload, and is difficult to check the plugging quality; The leak-filling method outside the cofferdam is more random, the effect is poor, and the cost is high

When the cofferdam cannot be made with high and low blades to seal the gap due to factors such as the size and weight of the cofferdam, or when diving plugging and throwing plugging cannot be implemented due to the depth of the water and the rapid flow, the high and low blades and sandbags are used to seal the cofferdam underwater. The bottom notch method is limited, the scope of application is limited, and it cannot be widely promoted and applied

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