Bridge prestress tensioning system

Abstract

A bridge prestress tensioning system comprises a computer unit, a tensioning instrument, a displacement sensor, a jack, a pressure sensor, a force sensor and a controller. The displacement sensor is arranged on the outer side of a cylinder barrel of the jack and connected with a piston rod, and the force sensor is arranged on a cylinder barrel base of the jack; the tensioning instrument comprises a temperature sensor arranged on the side wall of an oil tank, and the computer unit can send a signal and drives the jack to carry out tensioning operation through the controller; the controller is connected with the displacement sensor, the force sensor and the temperature sensor and transmits data information collected by the sensors to the computer unit to be further processed; and the force sensor, the displacement sensor and the temperature sensor are connected with the controller to achieve intelligence and standardization of bridge prestress tensioning work; and the system is scientific and reasonable in whole structure, convenient to install and operate, high in work automation degree, reliable in equipment running and capable of being widely suitable for being used in cooperation with various bridge prestress tensioning systems.

Description

technical field [0001] The invention relates to a bridge prestress tensioning system. Background technique [0002] At present, the existing prestressed tensioning equipment and its control components include a tensioning opening and closing control unit and an acquisition and control unit for collecting various data during tensioning operations. The tensioning equipment includes an oil pump unit, a motor, a drive control mechanism, an oil tank, Oil cylinder device, etc.; the oil tank is equipped with a pressure sensor for measuring the oil pressure value, and the tensioning oil cylinder device is installed with a displacement sensor for measuring the displacement value of the oil cylinder piston. The oil tank is equipped with an electromagnetic control valve for controlling the entry and exit of hydraulic oil. The data acquisition control unit is installed, which is connected to the computer unit by wireless or wired; when the tensioning operation is carried out, the data o...

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Problems solved by technology

[0003] However, there are many deficiencies in the existing tensioning system: For example, the problem of the sensor, when the pressure sensor is used for measurement, it generally only measures the pressure value of the oil inlet of the jack, not the stress value, and the data detected by the pressure sensor is easily affected by the oil temperature. , the viscosity of the oil and the influence of impurities; such as the temperature of the hydraulic oil, when the hydraulic device in the prior art is running, the hydraulic oil moves at a high speed, the temperature continues to rise, and the viscosity of the hydraulic oil changes, resulting in leakage or pressure drop in the hydraulic system. During construction in winter in the north, the ambient temperature is very low, resulting in high viscosity of the hydraulic oil, which makes driving and measuring difficult; there is a problem of force value synchronization control, the motor speed cannot be adjusted, or the oil is simply fed according to the same oil feed rate. The friction resistance of the prestressed channel of the railway bridge is very large, and the displacement values ​​at both ends are out of sync. In terms of unloading rate control, most of the pressure relief holes with the same diameter are used for pressure relief, or the valve block itself is used for pressure relief, and the pressure relief rate is single. And soon, the jack cylinder impacted the steel strand, resulting in excessive prestress loss; in terms of compatible functions, for the prestress construction of railway bridges, the channel friction test is very important, and every 100 beams must be done Once, the current equipment does not have this function, and another set of equipment is required for the test; in terms of data security, the existing equipment is manually compiled data, or automatically records after storage, printing and transmission

[0004] Invention patent CN201210460779 discloses a tensioning system, which solves some technical problems in this field, such as the above-mentioned force value synchronization control problem and data security; but this patent does not involve other problems, such as the force sensor problem and hydraulic oil temperature issues

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