大底盘高层建筑基础设计施工难点与jccad正确应用（The tall building foundation design and construction difficulties and correct application of jccad）.docVIP

大底盘高层建筑基础设计施工难点与jccad正确应用（The tall building foundation design and construction difficulties and correct application of jccad） The design and construction difficulties of large chassis high rise building foundation and the correct application of JCCAD 1, the application status of multi tower high-rise building with large chassis Each year, the town has completed construction area of 500 million square meters. Large chassis high-rise buildings, underground shopping malls, underground garage and large span buildings, multi-storey underground structure, in the current construction of residential areas and large public construction projects has played a very important role, the completion of the building area of the total area of up to 10%. 2, to the foundation design and construction problems (1) the upper structure is relatively large chassis underground structural stiffness, base reaction force is not uniform, the base of inhomogeneous deformation caused by foundation cracks, such as the China World Trade Center two project floor cracks, waterproofing failure; Kunming building stiffened raft foundation cracks, floor waterproofing failure. (2) at present, the solution to the uneven settlement of the large chassis high-rise building is to set up settlement joints, and two to set up the post casting belt for construction, and then pour the concrete after the settlement is basically stable. The settlement joint effect of underground space use, generally do not use, the construction of post pouring belt technology in middle and low compressive soil in the main structure of the cap after pouring the concrete pouring belt , it usually takes 1 or 1 and a half years, the construction of pouring belt . Support and in the area of groundwater, precipitation cycle is very long, considerable expenses, and increase the difficulty in construction. (3) connection condition between high-rise building and pure underground garage; Due to the use of functional requirements, the connection