TPi November 2013

products & developments Spiral-wound solution for storm water pipe

Different renewal methods were presented to the wastewater authority. The traditional way, which involved digging and rebuilding the storm water pipe, would have been the most expensive solution. Another problem was the situation of the pipe. Digging up the pavement could have caused structural damage on surrounding properties. Therefore a trenchless technology was required and SIARE, already familiar with no-dig methods, chose SPR. The SPR spiral-wound method can not only be used for the rehabilitation of standard-sized circular or box shapes, but also for special profiles of any type and dimension up to 5,000mm. Another advantage was that the road traffic was hardly affected. The SPR spiral-wound pipe rehabilitation technology rehabilitated the 110m of decayed storm sewer section by using an endless PVC profile strip, which was continuously wound into a new pipe inside the old pipe. The endless profile strip, wound on a spool, was fed into the sewer through a manhole. The spiral-winding machine was installed directly in the sewer. Its frame needed to be adjusted to the box shape. A special feature of SPR technology is that the machine crawls along the full length of the structure, combining with every rotation the SPR profile strip into a watertight pipe by a key-and-slot joint. Liners of any length can be created: as soon as one of the 13 above-ground profile drums was empty, a new one was welded onto it. After the winding process, the annular space between the SPR liner and the old pipe was backfilled with a high- strength mortar that ensures the static characteristics of the spiral-wound pipe. The 10° bend and lateral connections were no problem, and could be relined in one step. The installation took two and a half weeks. Sekisui SPR Europe GmbH – Germany info@sekisuispr.com www.sekisuispr.com

The pipe, based on a box shape with a height of 1,150mm and a width of 2,600mm, is located beneath a road in a suburb of Paris. The sewer lies 15cm to 1.5m below the ground level, partly following the traffic route. A camera inspection showed the extent of the problem: the pipe had corrosion damage, cracks and infiltrations. The construction work would be a challenging task, as the road section in need of rehabilitation was a one-way street, so possibilities for alternative routing were limited. Additionally, the storm water pipe often bordered private property, featuring a 10° bend and multiple lateral connections.

Following a collapse caused by material fatigue, French local wastewater authority SIARE (Syndicat lntercommunal d’Assainissement de la Région d’Enghien) chose to rehabilitate its custom-shaped storm water pipe with the spiral-wound product SPR™. 110m of the broken water pipe was rehabilitated within seven weeks. The renewal of the storm water pipe was given high priority by SIARE, as there had been previous collapses on the road: the ground gave way under the high load of a 22-ton roadwork machine; another was caused by material fatigue. The two incidents showed that the rehabilitation of the storm water pipe was required.

The spiral-winding machine is directly installed in the sewer

A watertight pipe is the result of the spiral-wound pipe rehabilitation method

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Tube Products International November 2013

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