Trenchless Pipe Rehabilitation Using Trolining's GIPP Method
Jens Kirste, Trolining
More and more sewer network owners and operators choose the GIPP method for the rehabilitation of their conduits.
Nowadays sewer network owners and operators are faced with a huge number of different trenchless methods, materials and suppliers to seal and rehabilitate their conduits. This applies especially for cross sectional pipe dimensions up to 1000 mm interior diameter. Above that size the number of approved systems and qualified installers reduces to a comparably small amount.
Since the early '90s Trolining GmbH, Germany is an internationally recognized expert in the field of trenchless pipe rehabilitation. Its patented GIPP (Grouted-in-place pipe) method has been successfully installed in about 20 countries around the globe. The continuously growing demand for reliable methods for the reinstatement of large sewers was a clear sign for Trolining to further increase the effectiveness of its system in that market segment. Pipes sizes between diameter 800 mm and 2000 mm interior diameter today represent Trolining's main field of application, regardless of whether the cross-sectional pipe profile to be rehabbed is circular or a special geometry.
The Trolining trenchless pipe rehabilitation system is based on various HDPE liner components which can be combined in a wide range of alternative configurations. The heart of the system is the Troliner with its V-shaped embedment studs. The annular void created by the studs is filled with Trolining Injektor, a specially engineered injection grout. This high-strength grout fixes the Troliner permanently in place and provides the load-bearing shell of the system.
Trolining liners are available for pipes ranging from 250 mm to 2000 mm interior diameter. Segmental lining sheets are offered for rehabilitation of lines greater than 2000 mm interior diameter. and for elbows and corners in man-sized lines. The rehab system improves the host pipe's flow characteristics and provides exceeding mechanical and chemical resistance.
Every liner is tailor made according to the exact measurements taken on the job site. That procedure guarantees the systems "Close-fit" characteristics, thus limiting the cross sectional reduction to an absolutely minimum. Prior to the liner insertion, the pipe section to be rehabilitated is plugged-off at both ends, cleaned and visually inspected. A cable winch is then used to unroll each HDPE liner from its transport drum and draw it through the line into position. After insertion, all HDPE liners are welded together at their both ends. The resulting liner "sandwich" is then inflated with a defined pressure through passages in the temporary plugs closing the ends of the liner section.
When the required inflation pressure is attained, the annular void is filled with Trolining injection grout fed from the down stream end. The grout's extremely low viscosity ensures 100% grouting of the annular void, even for long distances. Additional grout characteristics are a defined material expansion and an exceeding short term strength. The latter is decisive to keep the interruption time at an acceptable low level.
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