Abstract: A spraying device is drawn through an underground pipe and sprays a thixotropic resin onto the inner walls of the pipe. The resin cures and hardens, to form an internal lining to the pipe. The resin has sufficient thixotropy to enable it to be applied in a single operation to a significant thickness, preferably in the range 2 to 25 mm. The lining which is formed upon curing therefore has significant structural strength. To allow such a resin to be pumped from the surface down to the spraying device, along a significant length of tubing, the resin is firstly heated, prior to being pumped.Also disclosed is a swab for swabbing a pipe immediately prior to the application of a lining therein.

Abstract: A motor racing track fence comprising a plurality of fence modules each of which has a concrete barrier the area of the base of which is sufficient for it to be freestanding on the ground, having an upstanding sleeve adjacent one end of each concrete barrier and abutting another concrete barrier, the sleeve supporting upstanding support means which lie at the ends of weldmesh sheets surmounting the concrete barriers.

Abstract: A concrete sleeper for track systems incorporating electrical circuitry, in which sleeper electrically conducting cables are embedded, and therefore concealed therein, with an assembly to allow electrical connection between the cables and associated tracks and associated track side circuitry. In order to obtain connection to the track side circuitry a recess is provided in one end of the sleeper and receives a terminal box having contacts for contacting exposed ends of the embedded cables and connections within the terminal box are in turn connected to the track side circuitry. In order to achieve an electrical connection with the tracks the cables are connected, within the sleeper, to embedded parts of shoulders of rail fastening assemblies of the type marketed under the name PANDROL.

Abstract: This invention relates to a pipe seal or joint, and refers especially to a seal between an inner tubular surface and an outer tubular surface. The invention is concerned particularly, but is not limited, to seals of the O-ring or D-ring type employed in the joining of concrete pipes, for example for use between the spigot of one pipe and the socket of an adjacent pipe. The invention is applicable to the seals or joints between inner and outer tubular surfaces, such as pipes or other members, in which a sealing member is located in a recess formed in the outer surface, or in the body forming the outer surface.

Abstract: Methods of centrifugally molding a resin pipe or molding a layered composite pipe utilizing a rotating inner member are disclosed. The rotating inner member rotates at a speed higher than the centrifugally rotating mold and is movable towards and away from the mold surface. Movement toward the mold compresses the molding material between the rotating inner member and the centrifugally rotating mold. Movement away from the mold permits any material adhering to the inner member to be cleaned from said inner member due to the centrifugal speed of said inner member.