Views: 0 Author: Site Editor Publish Time: 2024-06-26 Origin: Site
Bridge jacks are mainly used in bridge construction. At this time, the jack will inevitably be used for beam tension. The error of the jack calibration curve will directly affect the actual tension effect of the bridge. If the error is too large, it will bring serious safety hazards. In bridge engineering, the equipment used to apply prestress is usually called tensioning equipment.
The tensioning equipment includes jacks, high-pressure oil pumps, pressure gauges, and external oil pipes. Due to the different actual size and surface roughness of the hydraulic surface of each jack, the sealing of RS and dust rings is different, resulting in different internal friction resistance of the jack, and the friction should change with the change of oil pressure and use time, and each jack must be strictly calibrated to reduce system errors. The force of the jack is generally measured and controlled by the oil pressure gauge, and the indicated reading of the oil pressure gauge is the unit oil pressure in the cylinder.
In theory, multiplying it by the piston area is the force of the jack. Since there is a certain friction between the cylinder and the piston to offset part of the force, the actual force is less than the theoretical force. In order to correctly control the tension, the calibration method is generally used to measure the relationship between the actual force of the hydraulic jack and the oil gauge reading. Due to the different states of the oil pump, jack, oil gauge, etc., the different operating proficiency and standardization, and the differences in data processing methods, the calibration curve error occurs.
Errors in the calibration process of the bridge jack are inevitable. The key is that we should control this error within a certain range. In order to reduce the error, we must regularly maintain and service the jack to ensure the integrity of the equipment. In addition, we must also be proficient in operation and correct incorrect operating methods in a timely manner.