Study On Construction Control Of Large Span Prestressed Concrete Converter Beam

In recent years,in order to adapt to a variety of complex building size and a variety of functional requirements,there are more and more construction projects about architectural design and use of conversion layer.In order to solve the large-scale underground parking lot,shopping malls,hotel halls and fire corridors and other building structure of large space function requirements,it usually needs to set a large volume of conversion layer.Because the ordinary reinforced concrete structure can not meet the requirements of the overall capacity,rigidity and stability of the transition layer,the building structure conversion layer is mainly used in the form of prestressed concrete structure to meet the current large space,large span structure design trends.The prestressed concrete beams in the building structure conversion layer are often involved in the large weight,and the distribution of the steel bars in the cross section is very close.During the construction process,the reinforcement of the steel bar,the concrete pouring maintenance and the prestressed tension construction are very challenging.Based on the actual project,this paper has carried out the theoretical analysis and research on the key and difficult problems encountered in the construction.The main work is as follows:1)Aiming at the difficulties in the reinforcement of the steel bar with large cross-section steel reinforcement beam and the general support frame can not meet the requirements of the construction,the paper analyzes the finite element analysis model of the steel bar supporting frame.Through the comparative analysis,the prefabricated steel bracket The rational arrangement of the program.2)Based on the analysis of circulating water cooling in the beam,the concrete construction temperature monitoring and analysis is carried out.Combined with the actual concrete temperature change curve,the influence of the temperature effect of the concrete is controlled effectively and the quality of the concrete is ensured.3)In view of the huge quality of the conversion beam,the design function is required to meet the requirement of GTC large space.The paper puts forward the reasonable monitoring scheme,and analyzes the settlement deformation data and the settlement curve of the converted beam structure,and gives the reasonable control measures To ensure the construction quality of concrete structures and safe and reliable.