After the completion of the dry environment construction of foundation pit support,the support structure at the interface of the land and sea box culvert should be removed to complete the docking of the sea and land box culverts.In order to solve the limitation that the traditional hydraulic crushing hammer process can only dismantle cast-in-place piles in sequence due to the influence of site and equipment station location,and the impact on the construction period,this paper conducts technical research and application of the underwater dismantling of the pit supporting cofferdam with box culvert rows and high pressure jet grouting piles in the land section of Yulong Island refinery and chemical integrated project.The technology adopts underwater rope saw method to cut the cast-in-place pile,and uses the existing large-tonnage crane ship for integral lifting during the installation of the offshore box culverts to determine key parameters such as rope saw cutting equipment,integral lifting of crane,design of lifting hole and lifting attachments,realizing underwater green and safe dismantling of cast-in-place piles and ensuring the smooth implementation of the project.
维普
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