Construction method and cofferdam structure of underwater bearing platform

Abstract

The invention relates to a construction method and cofferdam structure of an underwater bearing platform. The construction method comprises the steps that an anti-back-silting protection groove is formed in a preset position of the periphery of a foundation pit of the bearing platform; the foundation pit of the bearing platform is excavated at a preset position, and a steel casing is arranged in the foundation pit; and a steel hanging box with a reinforced concrete bottom sealing bottom plate is assembled on the steel casing, concrete is poured into the steel hanging box, and the bearing platform is obtained. The anti-back-silting protection groove is formed in the periphery of the foundation pit so that the situation that back silting of a riverbed occurs after the foundation pit of the bearing platform is excavated in place can be prevented; silt in the anti-back-silting protection groove is cleared away regularly so that the depth of the foundation pit can meet the requirement of aconstruction space of the steel hanging box; and in the rising and falling tide process, the flow plastic slit flows back to the anti-back-silting protection groove firstly in the flow plastic slit backflow process, and the silt in the anti-back-silting protection groove is cleared away regularly, so that the silt is prevented from flowing back into the foundation pit, therefore the space requirement for constructing a pouring jacket in the foundation pit is met, and it is guaranteed that the pouring jacket can be constructed smoothly.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method of an underwater cap and a cofferdam structure. Background technique [0002] Deep-water caps are the infrastructure and bottom support of construction projects such as water highways and bridges, and play a very important role in the stability of buildings. During the construction of deep-water caps, it is usually necessary to excavate the foundation pit of the cap into the water area with a flow-plastic silt layer. to the height requirement. Therefore, it is usually necessary to excavate a deeper foundation pit, resulting in a deep foundation pit that needs to be dredged to build a cap, which increases the construction workload and reduces the construction efficiency. In addition, in the process of building caps, first use concrete to build the bottom cover plate, that is, make a concrete seal layer for the bottom of the steel hanging box in ...

AI Technical Summary

Problems solved by technology

However, due to the deep position of the deep water cap, the flow plasticity of the silt in the deep water is strong, in order to meet the requirements of the construction of the cap, a thicker back-sealing concrete is required, resulting in a deeper dredging thickness for the foundation pit for making the cap , the thickness of the steel hanging box lifting system is relatively high

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