Renovation

In long relining with gravity Weholite pipes, the pipes joined into very long (even several hundred meters) lengths are pushed inside a damaged pipeline.
Weholite pipes can be joined by extrusion welding, thread joint or snap joint.
In short relining method, short - from 1 to 6-meter long Weholite pipes are pushed through existing manholes or small installation trenches. Weholite modules can be joined by snap joints with a seal, machine installed at the ends of the pipe, or can be thread joined with an additional weld.
Weholite pipes are offered in wide diameter range, from 300 mm to 3000 mm, which allows to customize a given pipe to the requirements of a given project.

Short relining with VipLiner modules is an inexpensive and very simple renovation method. Polyethylene VipLiner modules are pushed “from manhole to manhole” and snap joined with a seal. The modules are offered in diameter range from 90 mm to 630 mm. They have standard working length of 50 cm and are suited for installations of typical DNS 1000 manhole. We manufacture customized modules of different lengths.

Static cracking consists in crushing the old pipe by means of a special head connected with a hydraulically driven head by means of steel rods and simultaneous pushing in of a new pipe. As the old pipe is crushed and new modules are introduced, it is possible to maintain the present diameter of the pipe or even to increase it by approx. 10% of the cross-section.

In this technology a PEHD pipe of outer diameter smaller than the actual inner diameter of the old pipes, taking into consideration narrowings, deformations and shifts, is slipped inside the old pipe.
For this renovation method, solid walls WehoPipe PE or WehoPipe RC/RC+ pipes with diameters DN 63 mm – 1600 mm are used. Depending on the condition of the old pipeline and the parameters of the new pipe (DN, SDR, PE), it is possible to slip pipe lengths even longer than 1000 m. The joints are butt-welded. 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.
If it appears that due to its technical condition, the pipeline should be reconstructed or if a new pipe would cause considerable reduction of pipeline capacity, cracking method is used.

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.

If it appears that due to its technical condition, the pipeline should be reconstructed or if a new pipe would cause considerable reduction of pipeline capacity, cracking method is used.

Cracking consists in breaking the old pipe by hammer equipment or hydraulic expanders and introducing the new pipe directly after the crushing device. Once the work is completed, the new pipe takes over all the functions of the old collector.

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 type of the road and soil should be considered when designing the road culverts and selecting the suitable ring stiffness of the pipes. The guidelines and approvals of e.g. the Railway Lines Administration apply to the installation of culverts under the railway tracks.

Weholite culverts can be installed both with small and very big overburden. The ends of the culverts can be formed in any way accordingly to the inclination of the slopes. Weholite culverts are offered in a very extensive range of diameters, from 300 mm to 3000 mm and in a standard 12.5 m length. At client’s request we can make the culverts of any diameter, length and ring stiffness.