A kind of pretensioning method prestress tensioning construction method

Abstract

The invention discloses the technical field of precast beam construction, and particularly relates to a pre-tensioning-method prestress tensioning construction method. The method comprises the following steps that (1) all components of a tensioning pedestal are manufactured and arranged; (2) one ends of all steel strands are fixed to a fixed end steel cross beam of the tensioning pedestal, and the other ends of all the steel strands are fixed to a tensioning end movable steel cross beam; (3) single-beam-of-steel-strand tensioning equipment is used for preliminarily tensioning all the steel stands in sequence; (4) a centre hole jack located on the outer side of a tensioning end fixed steel cross beam is started and drives a traction steel bar to outwards pull the tensioning end movable steel cross beam, so that the whole steel strands are tensioned; (5) the centre hole jack is stopped, and tensioning stress is kept for a period of time; and (6) concrete pouring, maintenance, demoulding and tension releasing are conducted, and the whole tensioning process is completed. By the adoption of the method, the tensioning procedure is greatly simplified, the problem that synchronism is difficult to control when the two ends are tensioned at the same time is solved, and the process is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of prefabricated beam construction, in particular to a pretensioning prestressed tensioning construction method. Background technique [0002] Pretensioning method is a method of pre-stressing concrete members during the prefabrication process to improve the performance of members in order to improve the crack resistance of reinforced concrete members and avoid premature cracks in reinforced concrete members. Usually, the method of tensioning steel bars before pouring concrete is also known as pretensioning, and it plays an important role in engineering construction. [0003] At present, when the pre-tensioning method is used to prepare prefabricated beams, the structure of the tensioning platform used is relatively complicated, such as figure 1 and figure 2 As shown, it includes a bottom plate 1 and a support reaction wall 10, the support reaction wall 10 is arranged at both ends of the bottom plate 1, a...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to: aim at the complex structure of the traditional tensioning pedestal and the cumbersome process, poor control of synchronization, and loss of prestress in the traditional through-type tensioning method in the tensioning process, and design a A new tensioning pedestal with a simple structure, thereby providing a pre-tensioning prestressed tensioning construction method according to the new tensioning pedestal. The pretensioned prestressed tensioning construction method can simplify the tensioning process and overcome the simultaneous tension at both ends. Tensioning is difficult to control the synchronization problem, and the loss of prestress is small

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