大体积混凝土结构无缝施工技术（Jointless construction technology of mass concrete structure）.doc

大体积混凝土结构无缝施工技术（Jointless construction technology of mass concrete structure） In the construction of mass concrete structures, the control of concrete cracks is a very important subject. The section size of the mass concrete structure caused by external load is large, the crack possibility is very small, but due to the combined effect of cement hydration in the hydration heat release reaction caused by temperature and shrinkage, will produce large temperature stress and shrinkage stress, it will become a major factor in large volume cracks in concrete structure. The basement of Kaiyuan Plaza, two floors underground, basement floor plane size of 302.5 meters by 201.2 meters, the bottom 60 cm thick, the wall thickness of 40 cm, 20 cm thick roof, the construction technology of super long concrete structure seamless design. The design level of concrete is as follows: basement floor is C30P12; underground two layer exterior wall is C30P12; underground one floor exterior is C30P8; basement roof is C40P8.; design requirement is no crack and self waterproof technical requirement. This study adopts ZY and ZY expansive concrete, expansive concrete application research, determine the ZY shrinkage compensating concrete mix, in the process of implementing seamless construction scheme has taken effective control measures. Seamless construction scheme design: 1, design mechanism With the shrinkage compensating concrete added with ZY expansion agent as the basic material, the super long concrete structure is continuously poured with the reinforcing belt instead of the back pouring zone. According to the seamless concrete structure design requirements, the square floor block: after pouring the whole floor is divided into 4 parts, forming 4 pouring unit, and a block of expansion reinforcing band, which was then divided into 4 blocks, the entire floor is divided into 16 blocks. After the partition of the bottom plate is determined, the back wall and the reinforcing belt are left at the