Construction method and structure of steel sheet pile cofferdam in tidal zone of sea area

Abstract

The invention provides a construction method and structure of a steel sheet pile cofferdam in a tidal zone of a sea area. An inner supporting system is installed by utilizing the low tide level, the elevation of the inner supporting system is reduced as much as possible, and then the structural design of the cofferdam is more reasonable; before construction, turnover temporary brackets are machined and hung on wall bodies of pile foundation steel casings to be used for placing and fixing inner ring beams of the cofferdam, and after the fixing brackets are installed, turnover recycling is carried out in time; three combination methods are adopted for cofferdam leaking stoppage aiming at fore shaft structures of steel sheet piles, and then the water stopping effect of the cofferdam under theinfluence of tidal changes of the sea area is ensured; and cofferdam bottom sealing adopts low-water-tide-level water pumping dry sealing, meanwhile, a layer of bamboo plywood is laid on a base, thuspulp overturning during bottom sealing is prevented, the bottom sealing thickness is effectively guaranteed, and the bottom sealing quality is guaranteed.

Description

technical field [0001] The invention relates to a construction method and structure of a steel sheet pile cofferdam in a sea area tidal zone, and belongs to the technical field of bridge steel sheet pile cofferdam construction. Background technique [0002] With the vigorous development of my country's high-speed railway network construction, the construction of bridges across rivers and seas is increasing, and foundation construction, as a key control link in construction, is directly related to the progress of engineering construction. As a method of foundation construction, steel sheet pile cofferdam has the advantages of good waterproof performance, strong section bending resistance, and application to various soil layers. On-site construction can form cofferdams of various shapes according to the foundation form, and the materials can be turned over at the same time. The cost is relatively low, and it is widely used in water area construction. [0003] Steel sheet pile...

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Problems solved by technology

[0003] Steel sheet pile cofferdam structures are used for deep-water foundation construction in tidal flat areas or shallow sea areas. Due to complex construction conditions, high safety risks, and many uncontrollable factors, steel sheet pile cofferdams in sea areas have not been summarized and promoted in traditional construction.

At present, there are mainly the following problems in the construction: the impact of sea tides is not considered in the design, resulting in a relatively unreasonable design of the cofferdam structure and high construction costs; the number of cofferdams in the sea is generally relatively large, and the pile base steel casing is often used to weld the corbels. The turnover efficiency is low; the cofferdam is affected by tidal erosion, the fine sand filled in the lock is lost, and the water-stop effect is poor; the cofferdam is in the silt layer, there is mud turning during the bottom sealing, and the thickness of the bottom sealing cannot be guaranteed, etc.

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