A large-span prefabricated monolithic structure and its construction method

Abstract

Disclosed is a large span prefabricated monolithic casting structure. The large span prefabricated monolithic casting structure comprises a floorslab, a superposed beam and a column, the superposed beam and the column are used for supporting the floorslab, the superposed beam is divided into a short frame main beam, a long frame beam and an auxiliary beam, the auxiliary beam is connected with the main beam, the superposed beam comprises a prestress prefabricated beam and a cast-in-situ portion, the prestress prefabricated beam comprises a beam body and a pre-stressed steel strand which is buried in the beam body and serves as a main rib, two ends of the short frame main beam and the long frame beam are connected with the column, cross sections of prefabricated beam portions of the long frame beam and the auxiliary beam are invertedly T-shaped, the superposed beam after monolithic casting is an I-shaped beam connected with the floorslab, and the auxiliary beam and the long frame beam utilize the inverted T-shaped prestress prefabricated beams with small intervals. The large span prefabricated monolithic casting structure has the advantages that the span, the thickness and the self weight of the floorslab are small, heights of the beams are reduced, reinforcing bars are reduced, and the short main beam which uses a superposed rectangular beam is good in shear resistance and convenient to connect with the auxiliary beam.

Description

technical field [0001] The invention relates to a structural system and a construction method of a building, in particular to a construction method of a large-span prefabricated monolithic structure. Background technique [0002] The traditional large-span multi-storey reinforced concrete structure with high storey height generally adopts the cast-in-place post-tensioned prestressed structure. This kind of structure has a large amount of work to support the formwork during construction, and is prone to safety accidents such as the collapse of the high-support formwork. There are many construction procedures and the construction speed is slow. However, the prefabricated monolithic structure disclosed in the ZL201020553611. Prefabricated beams are heavy, and it is very difficult to transport and hoist the beams on the floor. Moreover, the current beams are all rectangular beams, which are heavy and have small lateral stiffness. The beams are easy to crack during transportation...

AI Technical Summary

Problems solved by technology

[0002] The traditional large-span multi-storey reinforced concrete structure with high storey height generally adopts the cast-in-place post-tensioned prestressed structure. This kind of structure has a large amount of work to support the formwork during construction, and is prone to safety accidents such as the collapse of the high-support formwork. There are many construction procedures and the construction speed is slow. However, the prefabricated monolithic structure disclosed in the ZL201020553611. Prefabricated beams are heavy, and it is very difficult to transport and hoist the beams on the floor. Moreover, the current beams are all rectangular beams, which are heavy and have small lateral stiffness. The beams are easy to crack during transportation and hoisting. The large bending moment in the stage often causes the problem that the height of the prefabricated girder is large, and the amount of reinforcement is controlled by the construction stage, resulting in waste of steel reinforcement and slow construction progress. One kind of inverted T-shaped long-span prefabricated beam is used to construct the frame first and then construct the building. There is no report on the long-span structure and construction method of the surface

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