Pretensioned beam whole opening prefabricated construction method

Abstract

The present invention discloses a monolithic prefabricated construction method of pretensioned beam, the main working procedures of which comprise: construction preparation, bottom die adjustment, guide device and lateral die installation, hoisting bottom web reinforcement, end die and steel beam installation, threading steel strand and PVC pipe, hoisting internal die and deck reinforcement, firstly pulling of steel strand, finally pulling of broken line reinforcement, finally pulling of straight line reinforcement, grider concrete packing, grider concrete maintenance, loosening internal and lateral dies, broke line extension, cutting guide device, straight line reinforcement extension, hoisting steel beam, end and internal dies removal, hoisting grider, cutting wire and sealing anchor, etc. The construction method adopts straight line and broken line reinforcements, which is able to meet the demand of prefabricated construction of bridge with 32m / 900t big span and large tonnage; at the same time, the construction method selects tension and extension technique of 52000kN large tonnage tensioning force, which ensures that the grider has balanced stress, and improves the tension and extension efficiency and security, etc.

Description

technical field [0001] The invention relates to a construction method of a prestressed concrete structure of a bridge engineering, and belongs to the technical field of girder bridge prefabrication. Background technique [0002] Prestressed concrete structure is developed from ordinary reinforced concrete structure. It is the abbreviation of prestressed reinforced concrete. The scope of use of reinforced concrete and other aspects have shown good results. It has been widely used in industrial and civil buildings, bridges, sleepers, pressure pipes, poles, piles, liquid storage and gas storage tanks, etc. [0003] Since 1958, my country began to study and trial-manufacture pretensioned beams. However, due to the use of linear reinforcement in the form of reinforcement, the maximum span of commonly used pretensioned beams is limited to less than 20m. In addition, my country's pre-tensioned beams usually use one end to tension in the application of prestress, and the other end...

AI Technical Summary

Problems solved by technology

[0005] For 32m / 900t class girder bridge pre-tensioned beam whole hole prefabrication construction, its span is large, its tonnage is large, and its construction is difficult. However, its construction technology and supporting equipment have no research records in China at present, and there are no similar research records abroad. Construction technology can be used for reference

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