Paul
15 April 2014Manufacturer Paul has released a new series of lifting cylinders with hydraulic anchor heads. The firms strand jacks are designed for strands with a diameter of 15.7 mm. An admissible force of 120 kN is allowed per strand. Paul offers strand jacks with a nominal load of 200kN to 6,400kN and a lifting stroke of 500mm. The series is designed to allow strand jacks for different rated loads to be easily combined.
The PDM series of strand jacks with mechanical anchor heads are available for rated loads of up to 1,600 kN. Whilst the PDH series of hydraulic anchor heads for rated loads of up to 6,400 kN. Strand guidance is guaranteed by hardened guide plates at the anchor heads and suspension. Telescopic strand guide tubes perform this function inside the hollow piston.
Every strand jack is supplied by a hydraulic pump unit. This Paul says allows hydraulic line lengths to be kept to a minimum. There are three different units using pumps with different delivery capacities. The pumps also supply the hydraulic anchor heads. The hydraulic cylinders convince by an extensive standard equipment and they can be optionally customised.
Operation of the strand jacks takes place centrally with the aid of a user-friendly control system. It visualizes up to 16 strand jacks on a display for full control of the hydraulic pressure, piston stroke and anchor assembly status. If required the display can be supplemented by additional strand jacks. The central control system is connected by means of a bus cable to the individual hydraulic pump units and processes signals in real time.
The control modes available on the system include the set-up mode and pre-load stroke, the automatic lifting and lowering mode and the manual mode for corrections.
The control system monitors the lifting or lowering mode. It is possible to select between pressure and path monitoring. If the prescribed limiting values are exceeded, the operator is warned and, if necessary, the current process is stopped in order to carry out the necessary corrections. In the automatic mode, the control system regulates the stroke and pressure automatically.
