Abstract: A pipe is assembled from sections of a liner pipe formed of a moulded glass reinforced plastics material (GRP). A sleeve, also of moulded GRP, sealingly surrounds the joint between the sections. An outer pipe of polymer concrete is formed in sections on the liner pipe sections to surround the latter together with the sleeve. The sections have a packer provided between adjacent ends, and the joint is offset from the joint between the liner pipe sections. The GRP of the liner pipe can withstand high chemical concentrations in toxic sewage, the sleeve preventing seepage of sewage and being able to withstand chemical attach by any passing through the inner joint. The polymer concrete enables the pipe to withstand jacking forces, and is also resistant to chemical attack from a basically saline surrounding soil.