720 linear feet of 10-inch sewer force main, located in Garuccha Spain, was in need of additional pressure capacity. A local contractor, Talleres Caype, SA, and the force main owner, GALASA, looked to Insituform Technologies, Inc. to provide this additional capacity. The old asbestos cement (AC) pipe was 10mm thick and was able to withstand only very low pressures. The system was originally designed in the 1980s with a pump operating at 30 psi. Two new pumps were proposed for installation to increase the pressure from 30 psi to 60 psi. As Garuccha is a coastal resort town, the population increases by almost 60% each summer. Thus, during the summer months, the community's water needs increase as well. An upgrade to a nearby pump station presented the opportunity to rehabilitate the sewer system at the same time using a structural cured-in-place pipe (CIPP) solution. The rehabilitated pipe carries roughly 80% of the town's sewage flow. Introduced in 2009, the structural rehabilitation solution is reinforced using different weights of glass fabric or multi-layered glass, and provides added strength and stiffness to meet the pressure requirements of force mains. The dry tube material is constructed of a polyethylene (PE)-coated layer and a specially-constructed glass layer. An overlapped seam is lightly-bonded during the manufacturing process to ensure the glass stays in proper alignment prior to installation and expansion. The installation pressure overcomes the seam bonding strength and allows the tube to expand to the full size of the host pipe. The City chose the trenchless solution, which minimized the digging and disruption of its picturesque streets while renewal was taking place in this scenic coastal village. The pipe was rehabilitated during a two-month window while work was being completed on the pumping station, therefore no bypass or other special requirements were needed. Despite narrow streets and a 36-foot grade, the pipe was rehabilitated to the client's specifications. This white paper will discuss the structure and physical properties of the structural CIPP system and provide detailed installation descriptions of the Garuccha project in Spain.
展开▼
