GRP-Large Profile Relining

The product

Mounting respectively lining procedures are suitable for the maintenance of accessible sewers. In the so-called mounting procedure, pipe segments or special shape segments such as egg shapes, box shapes or kite shapes as massive module respectively divided elements are inserted via building pits into the duct to be rehabilitated.

Pipe materials such as glass fibre reinforced polyester resin (GRP), polyethylene (HDPE) or concrete polymer are utilised.


The field of installation

Assembly and lining processes are ideally suited for the repair of walk-in sewers. Particularly worth mentioning: The pipes assembled during this renovation process have their own statics.

The installation

Short pipe relining
After the start and finish pits have been created, the planned circular or special profile pipes are lifted into the start pit using a suitable lifting device and placed on a movable steel frame construction (assembly trolley). In the next step, the new pipe sections are lifted hydraulically. A winch installed in the target pit then pulls the so-called trolley into the position to be rehabilitated, whereby the transport to the installation site is permanently checked by a worker and corrected manually if necessary. Once the new pipe has reached the job site, it is lowered hydraulically and the socket and spigot end are joined together. After the pipe string has been secured in position, the annular gap is filled with highly flowable insulation.

Full or partial lining
Pipe elements are inserted into the pipe to be rehabilitated via a shaft or construction pit and transported to the installation site with the assembly trolley. Here, the new pipe sections are either doweled, screwed on or glued into the old pipe. In a further step, the resulting pipe joints are connected in a watertight manner.

The advantages

It is a proven renovation process with high technical and economic potential. Thanks to the special tools developed by D&S for individual installation situations, the new pipes can be installed flexibly and precisely. Cost-intensive pumping work, which becomes necessary with some other reorganization procedures, can be done without with the assembly procedure. Equally important: interruptions in the event of unexpected rain events are possible at short notice and without damage. The continuation of the work can take place with only small expenditure at a later time. Pipelines rehabilitated with the assembly method are characterised by a high resistance to aggressive waste water. An inlet connection to pipes lined with PEHD or GFK is also possible without great effort.