Centrifugal placed concrete for lining horizontal pipes, culverts, and vertical shafts

摘要

Since 1991 Shotcrete Technologies Inc. has provided remotely-controlled equipment and knowhow for wet-mix shotcrete lining of many horizontal pipes, culverts, and vertical shafts in tunnels and mines. Some of these horizontal structures were over 1000 m long and some of the shafts were over 100 m deep. Pipe and culvert diameters ranged from as little as 450 mm to as much as 2.5 m. Shafts were typically in the 2.5 to 3.5 m diameter range. Plain and synthetic or steel fibre reinforced shotcrete mixes have been used in many such applications, depending on the engineer’s requirements. A remotely-controled wet-mix shotcrete lining rig is shown being winched through a pipe in Figure 1. Visual monitoring is provided by a television camera attached to the robotic rig. Figure 2 shows a similar wet-mix shotcrete robotic rig being used to line a raise-bore shaft at a mine.