The Construction Technique And Crack Control Application To Hangzhou Xinfeng Business Building

The Xinfeng business building is located in Hangzhou City near the Sijiqingclothing market which located in downtown. It is two floors underground and twentyfloors on the ground. The building is height of94.4meters. Its floor area is28264m2.Its basement of floor area is4807square meters. And the floor area of the building onthe ground is23457m2. It covers an area of1502.4m2.This article take mass concrete foundation slab of the Xinfeng business buildingas the object. It researches and analyzes the factors of causing cracks, for exampletemperature control, thermal stress and crack prevention measures. Based on theanalysis of stress control principle， calculation method of the mass concretetemperature and its temperature detection techniques, we designed the temperaturecontrol construction measure of the mass concrete foundation.The paper introduced techniques measures of mass concrete foundation slab ofthis building in construction. Including: main technology in construction of the massconcrete construction, for example the optimization of the design of the mixtureratio, construction organization, layout of cooling pipe, actually prevent crack effect;construction process temperature monitoring method and concrete curing.In the first3-5D (specifically in the3D), the temperature will reach highest,which the hydration heat of cement in hardening process of the concrete. Then beganto cool. That a calculation of the forecast value and the actual situation have a goodcoincidence illustrate control of temperature crack in mass concrete is feasible. Theconstruction experience of this building proved it can reduce or even avoid thestructure cracks that a good job for the construction preparation, careful organizationconstruction and strict control of construction process,The foundation slab construction process utilized the technologies with greatsuccess in solving the construction problem of mass concrete cracks. The construction method to avoid the crack of mass concrete is simple, and the material is easy to find.This method is economical and practical...