Sigricare

In recent years, the application of umbrella steel pipe roofing method aslong distance fore-pile has become a standard auxiliary method intunneling projects. The special drill tools (DRILLON Pipe System) makeit possible to use the same drill jumble on site for the pipes’ installation,which brings greater convenience for the contractors.In the aforementioned method, rigid steel pipes are installed toward thetunnel’s longitudinal direction to form an umbrella pipe group and theninjected with cement or urethane series grout to form a pre-supportingroof. The resulting grout consolidation doubles the support effect of thepipe group with its surrounding geology. This is why the resin grout ormicro fine cement grout with better penetration and shorter gel time ismore preferable by tunnel engineers.