Large diameter pipelines and culverts represent the backbone of any city’s utility network for the collection and disposal of sewerage and effective drainage of stormwater. In many cases the fabric of these pipelines, which may consist of brick, stone, concrete or clayware will have been constructed decades ago and although proven resilient, has eventually succumbed to the ravages of time, suffering the effects of H2S attack or erosion and may even be exhibiting signs of imminent failure due to structural loading beyond that of its remaining capability. At this point the need arises to consider the means by which the structural rehabilitation of these pipelines and ducts can be achieved whereby a new, 100-years plus life expectancy can be provided with a high degree of confidence. Channeline international has been providing bespoke Structural Glass Reinforced Plastic (GRP / FRP) lining systems since the early 1980’s, during which time we have accumulated unrivaled engineering and manufacturing experience for both Circular and Non-circular buried infrastructure worldwide. At Channeline, we are proud of our heritage and are committed to offering economic custom solutions to our existing and future customers in the Storm and Wastewater Sectors.
The general concept of the Channeline product is that a remarkably stiff and strong panel section is constructed, but with a relatively thin wall. The product differs from that of standard GRP hand or filament wound pipework in several fundamental and important ways. Normal GRP pipework consists of windings of layers of resin-saturated glass, which is impregnated with sand, achieving its stiffness by building up ever increasing wall thickness. Channeline however, derives its strength and stiffness through a different method, employing the mechanics of sandwich panel design, incorporating a unique polymer and aggregate core. The first stage of Channeline manufacture is an inner sandwich structure incorporating a 1.5 mm (0.06 inch) corrosion barrier on the inside surface which is manufactured from high grade surface veil, precisely impregnated with Isophthalic or Vinyl Ester resin, followed by several layers of thoroughly impregnated multi-axial engineered fabric and CSM, forming the inner sandwich skin. The central core comprising of carefully metered amounts of silica and resin which is pre- batched, mixed and evenly applied to the exact thickness required. The outer sandwich skin is then formed using several further layers of multiaxial fabric, CSM and resin, with the outer surface being treated with a bonded graded aggregate to enhance adhesion to the annular grout, which is used during the installation phase. The sandwich construction process is continuous, and carefully monitored and controlled ensuring exceptional bonding of all layers throughout the process.