Check once a month or check once for 50~100 anchor rods tensioned, and calibrate the tensioning equipment every 3~6 months.
Tensioning equipment mainly consists of jacks, high-pressure oil pumps, and sometimes also includes pressure sensors to determine the pulling force and determine the displacement of the anchor head of the percentage meter. Tensioning needs to be instrumented to determine the tension acting on the anchor prestressing tendons. Normally, a calibrated oil pressure gauge can be used, but it is more accurate and reliable to use a dynamometer.
Expanded Information
Tensioning equipment use and maintenance
1, the work site voltage shall not be less than 360V.
2, the hydraulic system must use 160 mesh filter filtered pure hydraulic oil, but not two or more mixed use. Seal the oil tank after adding oil. Oil should be changed every three months, the tank should be regularly clean the bottom.
3, the operation must have enough operating space, in order to facilitate the operation and to avoid damage to the jack after pressurization.
4, the oil pump and the operator of the jack must be closely coordinated, only in the jack in place, before starting the oil pump.
5, tensioning operations, oil pump driver under unified command, oil return, work is completed, cut off the power supply, the equipment should be properly stored and timely maintenance, disassembly or replacement of parts is strictly prohibited with a hammer, wearing parts replacement, must be strictly in accordance with the disassembly of the order of reset before and after.
6, in case of failure must immediately stop the machine to check, by the repair personnel can only be used after elimination.
7, as far as possible, do not separate the quick-change couplings, must be separated from the quick-change couplings must be kept clean, should be promptly screwed with a dust nut on the jack high-pressure tubes and nozzles, and encapsulated in a plastic bag, to avoid contamination of debris into the hydraulic system caused by oil leakage, tubing should be placed on the disk round.
8, oil pump in the open storage should be covered.
Baidu Encyclopedia-Prestressing Tensioning Equipment