Renovation

For renovation of damaged pressure pipelines solid walls WehoPipe PE or WehoPipe RC/RC+ pipes with diameters up to 1800 mm are used. The joints are butt-welded. In the long relining method a PE liner is pushed into the old, damaged pipeline. In result of renovation, the inner diameter of the pipeline is slightly reduced.

If it is especially important to minimize the narrowing of the repaired pipe, the swagelining „tight fit” renovation method, should be applied.  This installation technology is based on slipping long lengths of a PEHD pressure pipe into an old pipe. The difference is that the diameter of the new pipe is slightly greater than the diameter of the renovated pipeline.

The swagelining method involves reducing the outer PE pipe diameter (by a “hot” or “cold” method) and slipping the pipe through a special reducing matrix using the continuous, controlled pulling force. Deformed PE pipe is pushed inside the renovated pipeline, where, once the pulling force is released the pipe comes back to its original shape, which makes it fit tightly. Pipe within the range DN 75 mm – 1800 mm are used for this renovation method.

We propose Weholite pipes, used for a long time in the road construction, for the renovation of road culverts. Road culverts built in Weholite technology have very high dynamic load resistance. The properties of their construction material, i.e. polyethylene, give them long service life, complete lack of corrosion and high chemical resistance (inter alia to oil derivatives, salts). Weholite culverts are made from double-wall pipe which ensures high ring stiffness. The pipes are admitted for use in the mining damage areas up to 4^th category (inclusive).

Weholite culverts installed in many European countries are an alternative to traditional materials. The culverts are used both under the roads and the railway tracks. Weholite culverts became a standard in road construction in Europe, and specifically in Scandinavia, as the polyethylene is a completely environment friendly material.

The analysis of technical condition of a collector should comprise the manholes along its route. Their technical condition may also pose the same threats as the collector itself. Even if, before renovation, no infiltration of ground water in the manhole was found, after the collector is tightened, the ground water level may rise and leaks may occur. That is why in the areas characterized by a high level of ground waters, it is worth renovating not only the collector but also the manholes. Depending on the collector diameter and dimensions of existing manholes, their renovation can be performed using the existing range of PE pipe diameters.

Manholes are connected with the renovated collector by extrusion welding. Manholes are either replaced or their upper part is removed and dismantled and a chimney of a shorter diameter is introduced, while the space between the chimneys is filled with sand or cement mortar, depending on the structural condition of manhole.