As early as 03 years, Caint participated in the research and development and production of large-scale bridge jacking equipment, and then successfully applied the PLC multi-point synchronous jacking hydraulic system to the maintenance of Wuhan Yangtze River Bridge in 05, which is an important force to promote the use of synchronous jacking control equipment in the field of bridge jacking in China. Later, he accumulated important engineering experience in projects such as the maintenance and replacement of rubber bearings at 12 and 24 o'clock for Shanghai-Nanjing Expressway Bridge and the synchronous jacking maintenance at 36 o'clock for Shanghai Lupu Bridge, and played an important demonstration role in later engineering construction.
There are two main construction methods for synchronous jacking of bridges: direct jacking method and broken column jacking method.
Types of construction methods for synchronous jacking of bridges
Direct jacking method description:
The direct jacking method uses multiple hydraulic jacks to jack the bridge deck as a whole, often around the bridge bearing as a support point, and two or more jacks are placed around the support. This arrangement is similar to the contact point between the jack piston and the bridge deck when jacking, and will not affect the rigidity of the bridge body.
The direct jacking method has high requirements for PLC synchronization control, and the number of hydraulic jacks is large. With the maturity of PLC synchronous jacking hydraulic system and the increase in demand for domestic bridge jacking projects, PLC control accuracy is sufficient to meet the requirements of synchronous jacking of bridges. As a safe bridge jacking and greatly shorten the construction period.
PLC synchronous jacking hydraulic system description:
The control accuracy of this system is ≤±0.2mm, and it uses hydraulic drive, pressure and displacement closed-loop automatic control to achieve multi-point control, which can carry out functions such as heavy load weighing, synchronous jacking, synchronous jacking, synchronous landing, synchronous jacking in equal proportions, attitude leveling, and automatic pressure regulation. The system uses a frequency conversion governor to control the oil pump motor, relying on adjusting the frequency of power supply to change the motor speed, so as to achieve the purpose of continuously adjusting the flow rate of the oil pump, with appropriate electronic control and detection system, the lifting speed of the jack can be accurately controlled, and the jack synchronous control can be realized.
PLC synchronous jacking hydraulic system
As a professional manufacturer of intelligent control hydraulic system for push and lift in China, Kent will continue to contribute to the domestic bridge jacking cause. Warmly welcome your call!