The overall proportional slope adjustment jacking technology of the bridge is applied to the jacking of continuous beam sections in the renovation of cross-line overpasses. This method avoids the problems of uneven settlement of the beam body, and realizes the adjustment of the ramp and vertical curve of the bridge structure. As a technical equipment provider, Jiangsu Kearnt provides frequency conversion control synchronous jacking hydraulic system and supporting hydraulic jack for the overall proportional slope adjustment jacking of the bridge. Here are some specific application cases:
Case: Shanghai Beixinjing elevated slab girder slope adjustment and bearing replacement
Key technologies of equal proportional slope control:
The overall proportional jacking is synchronized in place, and is generally used on continuous beams. According to the different jacking heights of the bridge, the jacking speed of the jack is programmed by the PLC control synchronous jacking hydraulic system according to the linear proportional relationship, and the overall proportion of the existing bridge is jacked in place. This method can reduce the secondary stress generated inside the existing bridge, prevent structural cracks, and contribute to the safety of the bridge structure.
Introduction to the equipment used: PLC control synchronous jacking hydraulic system
PLC control synchronous jacking hydraulic system is composed of 4 pumps, 4 hydraulic jacks, 4 sets of frequency conversion speed control devices, 4 sets of control valve groups, electronic control system and displacement sensors, etc., which can be controlled synchronously by multiple hydraulic systems. It can realize the functions of synchronous jacking, synchronous landing, and synchronous jacking in equal proportions.