 | Intermediate Jacking Stations are used whenever the jacking forces
for the total drive are expected to exceed the capacity of the main
jacks, or the rating of the jacking pipe. |
| Jacking stations are slightly smaller in diameter than the pipe
and can range in capacity from 100 to 1,600 tons. Diameters usually
start at approximately 36". The length is around 56". |
| Thrust rings inside the I.J.S. are used to distribute the loads
evenly over the pipe jacking surface. Since they need to be removed
after the drive, the thrust rings are split into segments. |
| Wine Racks are inserted and internally expanded into the I.J.S. in
four segments. The hydraulic jacks are attached to the wine rack, as
are all the supporting hardware and are not mounted to the I.J.S.
skin. This allows for quick disassembly of the I.J.S. after the
drive. It also allows for less expensive I.J.S. skins. |
| Dimensions and tolerances to match the I.J.S. to the pipe are
critical to it's proper operations, as well as, it's proper
placement in the pipe string. |
