Rörjacking

Rörjacking, also known as pipe jacking, is a trenchless method used for installing underground pipelines. It is a form of microtunneling where a jacking machine, often remotely controlled, excavates the soil ahead of the pipe. As the machine bores, pre-fabricated pipes are pushed behind it through the excavated path. This process allows for the installation of pipes without the need for extensive open trench excavation, minimizing surface disruption.

The jacking machine typically consists of a cutting head that breaks up the soil, a slurry or spoil removal system to transport the excavated material, and a jacking frame that provides the thrust to push the pipes. The pipes are usually made of concrete, steel, or jacking pipes designed for this purpose. Rörjacking is particularly useful in urban areas, under railways or roads, and in environmentally sensitive locations where traditional open-cut methods are impractical or undesirable.

Key advantages of rörjacking include reduced traffic disruption, minimal impact on existing infrastructure and landscapes, and the ability to install pipes with precision over long distances and in various soil conditions. The method is often employed for sewer lines, water mains, and other utility conduits. The process requires careful planning and execution, including ground investigation, pipe material selection, and equipment calibration, to ensure successful installation and prevent ground settlement.