Trenchless replacement and laying of new supply lines
Efficient renewal of supply lines in cramped urban conditions
Trenchless, economical pipe renewal with the hydros® method
Our hydros® methodsoffer decisive advantages for the renewal of supply lines in urban pipeline construction. They are very cost-effective, especially in confined spaces and where pipes are densely packed. Drastic reduction of excavation work, removal of old pipes, working in the same route and vibration-free operation are further 'green' features.
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Customized equipment for pipe renewal and pipe laying
Tailor-made, proven and efficient technical equipment is ready for the following applications:
hydros®PLUS: Pipe replacement
The original is known as a press-pull process for replacing pressure pipes made of brittle fracture materials.
hydros®STEEL: Pipe renewal
A special cutting and expanding head using the hydros®PLUS pulling unitis used here especially for the renewal of pipelines made of ductile materials.
hydros®STAR: Neuro installation
With an additional pilot drilling rig and, if necessary, a flushing head, this method enables new installation or replacement with a large dimensional leap.
It goes without saying that our trenchless technologies for supply lines meet all the requirements of the DVGW regulations.
hydros®PLUS: Replacing supply lines
Trenchless replacement method for supply lines in the drinking water and gas supply up to a diameter range of DN 400 (400 mm) and individual pulling sections of up to 150 m in length. These individual sections are subdivided into partial sections up to 50 m in length by means of intermediate pits for service pipes, hydrants, etc.
When using PE ring bundles, laying rates of over 100 m per day can be achieved. The complete removal of the old pipes from the ground and the vibration-free working method protect the roots of the vegetation from damage, unlike other known methods. This environmentally friendly approach was awarded the Innovation Prize for Environmental Technology by the State of Berlin. Furthermore, the trenchless replacement of asbestos cement pipes has also been tested by the BG Institute for Occupational Safety (BIA) and included in BGI 664 under the identification number BT 13. Due to the extremely low noise emissions (<55 dB(A)), the Berlin environmental authority has issued a general 24-hour exemption permit for the process.
hydros®STEEL: Renewing supply lines made of more than just steel
Trenchless renewal method for supply lines in drinking water and gas supply up to a diameter range of DN 300 and sections up to 200 m in length. The hydros®STEEL processis based on the proven hydros®PLUS processand is used for the renewal of steel pipelines as well as ductile iron and plastic pipelines, preferably with PE pipes.
During the process, the old pipe is cut by the cutting head, expanded and the new pipe string is pulled in, preferably with external protection, in the same operation. The cut old pipe remains in the ground as a protective cap for the new pipe.
The original nominal diameter is retained or can be extended by one dimension or, in special cases, by two dimensions using a special technique.
Operational safety is guaranteed because the process does not create a closed cavity between the old and new pipes. The protective cap is removed quickly and safely using a simple special technique to integrate domestic and other connecting pipes.
hydros®STAR: Laying new supply lines
The further development of the hydros®PLUS processis used for the trenchless laying of new pressure pipelines with an external diameter of up to 600 mm and section lengths of up to 100 m. First, the new route is precisely realized with laser-controlled pilot drilling. The pipe is then pulled in depending on the dimensions by soil displacement or controlled hydraulic soil excavation.
The combination of conventional technology for pilot drilling and hydros®PLUS technologyensures an economical and safe installation technique. Depending on the soil, the displacement method is used up to DN 200.
For larger dimensions, our hydraulic flushing head is used to drive the new pipe route. In contrast to other known laying techniques, this prevents washouts. Since only water is used as the flushing medium, handling is considerably easier than with clay mineral flushing.
When using the flushing head, the hydros®STAR processcan also be used to replace pipes with large diameter differences, such as DN 100 to DN 400.
