Study On Construction Technology Of Over-long Concrete Structure

Convention and exhibition centre which has some characters such as big column grid, high space, large load, over—long structure and so on, is springing up in many big cities with the development of dometic economy. Desigh method and contruction technology of large span and over—long prestressed continuous frame structure has been researched according to Shandong province international convention and exhibition centre.Self-restricted stress of large bulk concrete has been calculated and analyized by finite element in the paper, the result of calculation and analysis is identical to test, and a series of measure has been put forward to control crack for tempreture; The fissure of over-long structure for concrete shrinkage or tempreture transformation etc, has been analyzed and compared detailedly-, The inner reason of concrete crack of beam and plane is column' s restriction for beam and plane;post -poured strip can effective solve the problem of concrete crack for initial shrinkage; Prestress can solve the problem of late crack for tempreture transformation.According to experience of this work, reasonable design plan must be selected and the means of calculation must combined common internal force calculation sofeware with finite element analysis about large span and over-long concrete structure; Because there are a lot of prestressed bar and reinforcing bar in the large-span beam; Suitable construction technology must been adopted and reasonable construction plan must been drafted before construction;texture of stressing end anchor at tendons is the key of prestress constrction technology; The mode of connection of multi-bundle prestressed bar in multi-span prestressed beanu the method of thrust tendon design of support system under big load in hign space and so on, is focal point in construction.Cracking control and construction quality has reach standard of nation,the result of calculation has been correspond with final construction. The level of construction has been in the lead in China by evaluate science committee of Shandong province.With constant rising of convention and exhibition centre, large-span and over-long prestressed concrete structure shall be used widely. The result of the paper can be reference to design and construction of large-span and over-long prestressed concrete.