Research And Application Of Cracking Control Of Ultra-thick Concrete Wall And Form Structure Design

With the development of national economy and the increasing of national power, many advanced science experimentation had been done more and more lucubrate. These advanced science experimentation, which mostly have serious influence to surrounding environment in the course of experimentation, such as radiance and so on. So the building wall of experimentation location must have special character to radiance, as currently in all kinds of measure with comparatively extensive, the design method is take the ultra-thick wall concrete.Because ultra-thick wall concrete thickness is relatively heavy, concrete temperature that is produced heat of hydration produce and concrete shrinking easy lead to the concrete cracking, So the control concrete cracking is the key to ultra thick wall concrete while construction. But in the past, the researches to concrete temperature stress and shrinkage stress were mainly centralized on foundation of heavy-duty equipment and valve board of the skyscraper and so on, the research to ultra-thick wall concrete structure was relatively deficient, so its application was limited greatly. The design and construction mainly depended on past practical experience, which caused a large number of wastes and hidden dangers in project. So this research in this paper has important actual project value.At firstly base on the theory concrete cracking and the character of temperature stress and shrinkage stress of ultra-thick wall concrete, this paper discusses the succinct calculation method of temperature shrinkage stress and the maximum value on succession construction, and according to the basic calculation formula of temperature shrinkage stress and construction practice to ultra-thick wall concrete structure, put forward the corresponding technical measure of cracking control. Secondly, according to the importance of the form structure in the course of construction, select the form system of ultra-thick wall concrete structure, and calculation analyze the structure receive strength, detail discuss the course of calculation, for project personnel to design consulting. In the end, This paper constructs for the instance with the 3m thick ultra-thick wall concrete structure in the project of ICT centre in Chongqing university, from the calculation to shrinkage stress and concrete heat insulator thickness, and mix radio design and optimizing, steel reinforce engineering, form engineering, the pump of concrete, the temperature test on the spot, cure, and so on. The project practice application indicate ultra-thick wall concrete structure temperature shrinkage stress calculate formula full foot project actual need, the technological measure of preventing the ultra-thick wall concrete temperature cracking of that this paper explains is effectual.