Pipeline installation in one step -  Direct Pipe®

 

With the unique Direct Pipe® technology, Herrenknecht has opened up new possibilities for installing pipelines in every geology. This method combines the advantages of microtunnelling and HDD technology.

In one step only, a prefabricated pipeline can be installed and the required borehole excavated at the same time. This allows speedy and highly economic installation of pipelines with lengths of more than 1,500 meters.

The foot print of the equipment at the launch and reception points is very small with the Direct Pipe® method. Therefore, the technology can be implemented even in densely populated residential areas – simple, close-to-the-surface launch and reception pits are sufficient. It is no longer necessary to construct deep shafts. The microtunnelling machine is recovered in segments of approximately 3 meters in length after excavation is finished. In a final step, the supply and discharge lines are removed from the pipeline. The crossing is complete and the pipeline has been installed in one single step.

Attacking from one side only

With the Direct Pipe® method, the entire jobsite infrastructure, including the prefabricated pipeline, is located on one side of the crossing. Therefore, the expenses for logistics and the foot print requirements at the reception point are minimal. Hence, this technology is also ideal for constructing so called sea outfalls (landfalls) – where the pipeline is installed directly from the mainland out towards the open water. After reaching the planned distance, the machine is retrieved from the sea floor or lake bed.

 

Hall 4, Stand D2