Renovation of the sewage collector, Swarzewo, Poland
Optimal solution for different types of loads
Construction of the bypass: WehoPipe PE100 DN400x19.1 PN8 SDR21 pipes with a total length of 2950 m
Tight-fit renovation - the optimal solution
As the collector pipe is very important for the wastewater management in the Wladyslawowo area, it was decided that basically the entire interceptor would be renewed. In preparing to carry out the investment, the contracting authority, Spółka Wodno-Ściekowa Swarzewo, carried out a detailed analysis of the possible techniques to be used, taking into account the advantages and disadvantages of various solutions. The tight-fitting method (or similar relining with PE pipes) was chosen as the optimal method.
Two failures in one year
At the tender stage, the contracting authority stressed that the rehabilitation should ensure the self-supporting nature of the canal structure. The contracting authority pointed out that the circumferential stiffness and the thickness of the rehabilitation walls should be adopted on the basis of theoretical calculations based on actual data (foundation depth, groundwater, dynamic loads), and the calculations in the design should take into account all types of loads acting on the pipeline.
In the tender (design and build formula), the offer of the consortium of G.T. companies was considered the most favourable. DESIGN by Sp. z o.o. and G.T. DESIGN by Tadeusz Galisz. The general contractor entrusted the supply of structural class A ducting to Uponor Infra sp. z o.o.
What is the tight-fitting method?
The installation technology consists of pulling long sections of PEHD pressure pipe into the old pipe, with the outer diameter of the pipe to be introduced originally being equal to or slightly larger than the inner diameter of the pipe to be repaired. Then, after welding, the pipe is pulled through the reducer so that the outside diameter is reduced and it can be inserted into the pipeline to be repaired. The pulling force is then released and the PEHD pipe, after a relaxation process, presses tightly against the inner wall of the old pipeline. The advantage of this technology is that a small reduction in the inside diameter of the repaired duct is achieved, which, with a significant reduction in surface roughness, significantly improves throughput. There is also no need to fill in the space between the old and new pipe, the renewed pipe does not require further repairs and maintenance. An additional benefit is the structural reinforcement of the repaired sewer - the new pipeline is self-supporting, carrying the load.
Renovation of a collector pipe by the sea
Deliveries of pipes for the described investment started in September 2021. For the renovation of the Władysławowo-Swarzewo collector pipe, it was decided to use WehoPipe PE100 DN600x23.0 PN6.3 SDR26 pressure pipes with a total length of 2,530 m. They were transported to the worksite in 12.5 m sections. The pipes were joined together by butt welding. A DN630 welding machine was used for this purpose. Deliveries were completed in February 2022.
The use of PEHD pipes has resulted in 100 per cent leak-tightness, durability and a collector pipe life of more than 100 years. Systems made of this plastic are resistant to abrasion, corrosion and chemicals. The fact that they are used, for example, as process pipelines for chemical plants or cooling water pipelines in power plants, must work on the imagination. So, as you can see, residents and tourists can look forward to this year's holidays with peace of mind.
Spółka Wodno-Ściekowa Swarzewo
Konsorcjum firm G.T. PROJEKT Sp. z o.o. oraz G.T. PROJEKT Tadeusz Galisz
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