Modern techniques for renovating channels, pipelines and shafts involve little or virtually no outlay for excavations. This not only saves time and money but also benefits the environment, as the potential problem of waste water or ground water flowing in or out can be solved significantly faster than with the usual techniques.
Another huge advantage of this is that disruption to the supply is considerably reduced, combined with the fact that far less dust and noise are generated and that traffic hold-ups are kept to a minimum. Even conflicts with other construction projects can be prevented and avoided if everything is planned correctly.
Pipe bursting is one of the most ecofriendly methods of renewing buried pipelines. In this process, the existing pipe is destroyed using a cutting blade and then driven out into the surrounding soil. The new pipe is inserted at the same time. Depending on the conditions of the ground, this technique allows up to 200 metres of pipe to be replaced every day – and for the cross-section of the pipe to be increased by up to two dimensions.
This pipeline renovation method is suitable for pipes measuring 65 to 800 millimetres in diameter and can be employed both for general channels and for gas and water pipes.
There are two different types of relining: Short pipe relining and long pipe relining. Both techniques see the new pipe being fed or pushed into the existing pipe. The slight reduction in the diameter of the pipe that results is normally offset again by the improved flow properties of the new pipe. In short pipe relining, individual rigid segments – which can essentially be circular profiles, oval profiles and special profiles of up to three metres in diameter – are built into the old installation one by one.
When working with smaller diameters of less than 500 millimetres, long pipe relining is often more cost-effective. In this technique, pipes measuring several metres in length are welded together on site and then fed into the old installation. The flexibility of the pipes makes it possible to use radii of 15° here.
Vehicles passing over the top of a shaft often generate strong vibrations which, in the long run, can result in the structure of the shaft cracking and breaking. This creates leakage points that allow waste water to seep out and ground water to seep in. Taking professional corrective action in good time enables even substantial damage to be repaired without undue expense. This essentially involves either coating shafts with a suitable repair mortar or lining shafts with pre-cast parts made from polymer concrete or glass fibre-reinforced plastics. The stirrups and shaft covers are also checked as part of this process, and are then replaced if necessary or else incorporated into the other repair and renovation work.
If minor damage, such as fractures, holes and cracks is found early, our experienced staff can rectify it with consummate skill. Fractures and holes can be repaired using sulphate-resistant repair mortar, for example, while ground water infiltration can be sealed off by drilling in injection packers and then grouting them with injection resin. The advantages of taking remedial action at an early stage are reflected in the short installation time and low costs.