Research And Application Of Key Technologies For Large Caisson Construction

The caisson is one of the main building structures of the large-scale water transport project.The construction of the caisson includes all the key steps of prefabrication,transportation and installation.At present,there are few studies on caisson construction under the conditions of large-scale short-term caisson installation and complex construction environment.Based on the western standard section of Haikou Ruyi Island Reclamation Project,this paper summarizes and studies the large-scale caisson construction technology,and carries out the key construction technology and application research of large caisson according to the complex engineering conditions on site.The main research contents and conclusions are as follows:1.Summarize and analyze the large-scale caisson construction technology,and analyze the problems and deficiencies in the current research.Combined with the project--the problem of caisson construction in the west section of Haikou Ruyi Island Reclamation Project,the purpose and main content of this paper are proposed.2.Carry out a detailed study on the prefabrication of the caisson in this project,analyze the difficulties and key points in the prefabrication of the large caisson,and determine the setting problems of the subsequent caisson installation and the reserved holes,and analyze the problem.Influencing factors of caisson quality in caisson prefabrication,improvement measures to improve caisson quality are proposed.3.The key technologies for the caisson shipment in the western standard section of the Ruyi Island Reclamation Project in Haikou are elaborated.The research analyzes the main processes of the current caisson shipment,including the semi-submersible barge and the crane ship out of the caisson technology,and analyzes its construction process and key technologies,such as airbag calculation and selection and finished product protection measures.4.A detailed analysis of the construction method and control of caisson in the west section of the Ruyi Island Reclamation Project in Haikou is carried out.The key technologies such as caisson installation and positioning are studied in detail.Aiming at the problem of insufficient stress on the hanger in the later caisson installation,through comparative analysis,the design of the caisson double-layer steel structure hanger is re-studied,the results can provide reference for similar caisson construction.Therefore,this paper has completed the research and application of key technologies such as prefabrication,transportation and installation in caisson construction.The research in this paper successfully completed all the large caisson constructions under the conditions of large-scale short-term caisson installation and complex construction environment,and achieves good results.