Research On The Applied Technology Of Pile-gravity Type Complex Structure In The Deepwater Port

As harbor construction resources are becoming exhausted and the ship is larger, it has be endeveloped to open sea with adverse conditions. Due to the restricted construction condition on traditional open piled wharf and gravity quay structure feature, the open piled wharf is tech nically and economically infeasible. Therefore, how to apply to open sea deep water condition while retaining the traditional wharf advantages, has become an important subject in open sea deep water wharf's design and constructionDomestic deep water off the coast of the South Terminal building as a backdrop,pile-gravity type complex structure is proposed. Based on lower gravity type structure, and upper pile base structure and pile-gravity type complex structure overall hosted force calculation and the analysis, stated has pile-gravity type complex structure of by force features; established spatial structure model, used finite element analysis software for structural static analysis, proposed has pile-gravity type complex structure forces of calculation method. Based on anti-toppling, anti-sliding stability, base bed stress and foundation bearing capacity calculation and analysis, stated has pile-gravity type complex structure on offshore deepwater environment of adaptability. The actual project, proposed pile-gravity type complex structure used in deep water off the coast of construction methods and key processes. Study reached the following main conclusions:(1) Paper proposed of pile-gravity type complex structure been suitable for deepwater wharf, structure performance out following features: composite structure is between high pile cap table structure and gravity type caisson structure, which played high pile wharf with the advantages of gravity type wharf. The upper part of pile foundation structure can effectively reduce the pile body intermal force of truss structures. Compared with completely gravity caisson structure, it can greatly reduce the waves of deepwater environment load. Bed stress ratio force decreases about 50%. Project cost increased slightly as the water goes deeper.(2) Work platform which adopted compound structure, anti- toppling stability coefficient can reach to 1.85,comparing to the gravity 1.46,has increased by 26.7%; anti-sliding stability coefficient is 1.50,and gravity is roughly 1.62, is almost the same. All can ensure the stability of complex structure. Other hydraulic structures such as dolphin mooring pier,the-toppling stability coefficient has increased by 7~8%. Guide piers anti-toppling stability coefficient of a gravity structure has increased by about 40%, the composite structure showed good overall stability.(3) The key point of compsite strcture design is to determine the height of variant caisson foundation. This paper proposed to balance the overall stability of composite structures and pile foundation strength design optimization. Composite structure of pile foundation part adopts truss structure in order to reduce the internal force of pile foundation.(4) Combined with practical engineering of the construction technology of compound wharf structure is: pile-caisson complex structure prefabrication, shipped out and placed,within the caisson backfill foundation treatment of complex structure and underwater casting cap caisson, poured uderwater concrete inside the steel tube column pile core, poured reinforced concrete subject at the top of the pile caps, and affiliated facilities installation.