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Bridge body prestress tensioning method
The invention relates to a bridge body prestress tensioning method. The method comprises the step S5 of stably tensioning prestressed tendons in a graded mode, and specifically comprises the followingsteps that during tensioning, jacks at the two ends conduct oil feeding tensioning at the same time, the tensioning time is controlled, the tensioning control stress time from 0% to 100% is no less than 10 Min, every 5 PMa is one time of rising, and marks are made once every 10% of extending; and under 100% tension control stress, the time is longer than 2Min, oil feeding and oil returning of thejacks are slow and stable, and the oil returning time is not shorter than 2Min. The method has the beneficial effects that prestressed tendons are tensioned in a graded mode, stress concentration points caused by one-time tensioning of the prestressed tendons can be avoided, tensioning of the prestressed tendons is more uniform and stable, the tensioning time is controlled, the prestressed tendons can slowly adapt to the tensioning force, and when the preset value of the tensioning force is reached, the prestressed tendons are anchored after being loaded for a certain time, so that the tensioning stability is further improved.
本申请涉及一种桥梁梁体预应力张拉方法，包括平稳、分级张拉预应力筋的步骤S5，具体如下：在进行张拉时，两端千斤顶同时给油张拉，并控制张拉时间，从0到100%张拉控制应力的时间每束不少于10Min，每5PMa为一次上升，每伸长10%作一次记号，在100%张拉控制应力下时间大于2Min，千斤顶给油和回油缓慢平稳，回油时间不少于2Min。本申请的有益效果为：将预应力筋分级进行张拉，能够避免对预应力筋一次性张拉造成的应力集中点，使得预应力筋的张拉更为均匀、稳定，控制张拉时间，能够使得预应力筋能够缓慢适应张拉力，当达到张力的预设值时，使预应力筋持荷一定时间再进行锚固，进一步提高了张拉的稳定性。
Bridge body prestress tensioning method
The invention relates to a bridge body prestress tensioning method. The method comprises the step S5 of stably tensioning prestressed tendons in a graded mode, and specifically comprises the followingsteps that during tensioning, jacks at the two ends conduct oil feeding tensioning at the same time, the tensioning time is controlled, the tensioning control stress time from 0% to 100% is no less than 10 Min, every 5 PMa is one time of rising, and marks are made once every 10% of extending; and under 100% tension control stress, the time is longer than 2Min, oil feeding and oil returning of thejacks are slow and stable, and the oil returning time is not shorter than 2Min. The method has the beneficial effects that prestressed tendons are tensioned in a graded mode, stress concentration points caused by one-time tensioning of the prestressed tendons can be avoided, tensioning of the prestressed tendons is more uniform and stable, the tensioning time is controlled, the prestressed tendons can slowly adapt to the tensioning force, and when the preset value of the tensioning force is reached, the prestressed tendons are anchored after being loaded for a certain time, so that the tensioning stability is further improved.
本申请涉及一种桥梁梁体预应力张拉方法，包括平稳、分级张拉预应力筋的步骤S5，具体如下：在进行张拉时，两端千斤顶同时给油张拉，并控制张拉时间，从0到100%张拉控制应力的时间每束不少于10Min，每5PMa为一次上升，每伸长10%作一次记号，在100%张拉控制应力下时间大于2Min，千斤顶给油和回油缓慢平稳，回油时间不少于2Min。本申请的有益效果为：将预应力筋分级进行张拉，能够避免对预应力筋一次性张拉造成的应力集中点，使得预应力筋的张拉更为均匀、稳定，控制张拉时间，能够使得预应力筋能够缓慢适应张拉力，当达到张力的预设值时，使预应力筋持荷一定时间再进行锚固，进一步提高了张拉的稳定性。
Bridge body prestress tensioning method
一种桥梁梁体预应力张拉方法
LI TAO (author) / YUAN XIANYI (author)
2021-01-29
Patent
Electronic Resource
Chinese
Bridge prestress tensioning frequency conversion control method
| European Patent Office | 2021