Definition - What does Interjack station mean?
An Interjack station, also known as an intermediate jacking station, is apart of the pipe jacking process. Interjack stations are used when the total length of the replacement pipe exceeds the main jack’s ramming ability. The station consists of two pipes – a Lead pipe and a Trail pipe – with a specialized hydraulic system (the Interjack) situated between the lead pipe and the trailing pipe. The Interjack surrounds and grasps the pipe being installed. And pushes – rather than rams – the pipe forward.
Trenchlesspedia explains Interjack station
Interjack stations are dug and installed along the pipe’s design path over the course of the pipe drive. The main jack rams the pipe to the first Interjack station where it enters the lead pipe. The Interjack grabs the pipe and pushes it through the trailing pipe, to continue its journey to its destination. This means the main jack is effectively jacking or ramming only the pipe sections between itself and the first Interjack station. It also means that, the longer the drive, the more Interjack stations are used.