What should I pay attention to in prestressing bellows for prestressing test?
Release time:
2023-04-28
What should prestressed bellows pay attention to for prestress test?
1. When the prestressed bellows detects the prestress. Because different bellows have different steel strands, and the same steel strand also has the phenomenon of uneven raw materials, and regarding the cross-sectional area of the steel strand, there will be a practical deployment of the steel strand section area greater than the cross-sectional area of the steel strand that controls the tension prestress test.
2. Due to the texture of the steel strand itself prepared by the prestressed bellows, when the deployment is carried out for the control tension prestress test, the slope is tightened and deformed due to operational problems, so that when the tension test is controlled, the length value of the tension becomes smaller, and the useful prestress allocated in practice is less than the value at the time of inspection.
3. The problem of the quality of body grouting of the prestressed bellows, during the practical work, the grouting of the anchor section is not full, so that the useful prestress in practice is less than the tension control prestress allocated during the test.
4. The prestressed bellows is due to the improper operation of the staff when the control tension prestress test is carried out, the recording and analysis of the data is not good, and the value of the tension and the displacement status in the test are recorded and the practice status are paid, so the practical useful prestress will be less than the control tension prestress during the inspection, which also brings safety hazards to the practical project.
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