The microtunnelling machine may get all the attention, but it is the jacking rig which actually pushes the pipes into the ground.
Iseki jacking rigs are all ruggedly engineered forlong and reliable service. We have designs for all pipe sizes from 250mm I.D. upwards, and with jacking forces from 100 tonnes to 2000 tonnes.
Iseki hydraulic jacking rigs come in three main types, the Multi-Indexing rigs, the Compact Short Stroke rigs, and the Molemeister Long Stroke rigs. To permit longer drive lengths, Interjacks can also be supplied.
We also supply a range of hydraulic power packs with which the jacking rigs are operated.
Compact Short-Stroke Jacking Rigs are used with the larger pipe sizes, and consist of a set of hydraulic cylinders mounted in front of a pair of thrust blocks and behind a crosshead. The jacks push the crosshead, and with it the microtunnelling machine and pipes, along a set of jacking rails. These rigs are designed to be shipped in modules and assembled on site.
The Molemeister Long Stroke Jacking Rigs are designed to push a complete pipe in one stroke. They are available with jacking forces from 200 tonnes to 2000 tonnes.
Multi Indexing Short-Stroke Jacking Rigs are designed to fit into jacking shafts little larger than the microtunnelling machine length. They achieve this by means of latches which lock the crosshead into one of four sets of apertures in two thrust plates. The two short-stroke hydraulic cylinders extend to advance the thrust plates, and thus full jacking stroke is achieved by advancing the thrust plates four times.
Interjacks are supplementary jacking units which are installed in long drives at 100m intervals to permit the drive to be operated as separate 100m sections, thus minimising the effects of friction. They use jacking pipes with very long collars, inside which a set of hydraulic jacking cylinders is arranged. Each section is jacked in turn from the machine back to the jacking shaft. When the drive is completed, the jacks are removed, and the following pipe is then pushed up into the space where the jacks had been.