Pre-cast reinforced concrete pipe sections lined with a high-density polyethylene embedment geomembrane (Concrete Protection Liner) that has anchor studs on one side. This liner is inserted into the wet concrete and when the concrete cures the embedment strip forms an integral part of the pipe surface providing long-term protection against chemical, gas and corrosion attack.
The experienced technicians will do extrusion welding with a minimum overlap of 10 cm where each pipe section is joined to form the tunnel.