Tension machine for automatically controlling prestressed reinforcement tension and retraction amount

Abstract

The invention discloses a tension machine for automatically controlling prestressed reinforcement tension and retraction amount. The tension machine comprises a high-pressure plunger hydraulic pump and a hydraulic jack. The tension machine is characterized in that a tension cylinder stop valve rotation shaft, a return cylinder stop valve rotation shaft, a tension cylinder throttle valve rotation shaft and a return cylinder throttle valve rotation shaft of the high-pressure plunger hydraulic pump are correspondingly connected with a tension cylinder stop valve stepping motor, a return cylinder stop valve stepping motor, a tension cylinder throttle valve stepping motor and a return cylinder throttle valve stepping motor respectively through couplers, the tension cylinder stop valve stepping motor, the return cylinder stop valve stepping motor, the tension cylinder throttle valve stepping motor and the return cylinder throttle valve stepping motor are driven by a tension cylinder stop valve stepping motor driver, a return cylinder stop valve stepping motor driver, a tension cylinder throttle valve stepping motor driver and a return cylinder throttle valve stepping motor driver respectively, and a displacement sensing mechanism is arranged on the outer side of the hydraulic jack. The tension machine can automatically acquire prestressed reinforcement retraction amount data.

Description

technical field [0001] The invention relates to a construction engineering tool, in particular to a tensioning machine. Background technique [0002] In order to meet the quality requirements of strict control of the shrinkage of prestressed tendons in 6.4.11 of GB50666-2011 "Code for Construction of Concrete Structures", current prestressed engineering construction usually uses manual measurement of jack cylinder strokes, manual records and judgments The retraction amount of the prestressed tendon at the tension end in the anchorage stage refers to the shrinkage caused by the relative movement between the anchorage parts and between the anchorage and the prestressed tendon and the local plastic deformation during the anchorage process of the prestressed tendon. Shrunk. The traditional method of measuring the shrinkage of prestressed tendons: 1. When the initial tension (reaching 10% of the tension control force), record the stroke of the jack cylinder once, that is, δ1; C...

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Problems solved by technology

[0004] (1) Manual measurement of the jack stroke or the displacement of the prestressed tendon requires the operator to be close to the jack to complete, and the jack must apply a tension force of 50~500T to the prestressed tendon during the tensioning process. If the anchorage fails or the prestressed tendon breaks and other emergencies will pose a serious threat to the safety of operators;

[0005] (2) The retraction limit of the national standard is as small as 1mm, while the minimum scale of the steel ruler with the highest precision is 0.5mm, and there are many obstacles during operation, and the accuracy of manual measurement of the stroke of the jack or the position of the prestressed tendon is not high;

[0006] (3) Manually measured values ​​need to go through manual processes such as eye readings and manual records, which are prone to errors and cannot be checked;

[0007] (4) When the shrinkage of prestressed tendons exceeds the standard, whether to re-operate and whether it can be found at that time is completely dependent on the person, and it cannot be traced afterwards

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