| 摘要 |
A lining for a tunnel, shaft or the like comprising a series of rings joined in end-to-end relation wherein each ring comprises a plurality of segmental blocks connected together in side-by-side relation by at least one resiliently deformable fishplate which is secured to the blocks and wherein each ring is connected to an adjacent ring by bolts, each bolt passing through at least a portion of one block of each of two adjacent rings and serving to compress the or each fishplate located between said rings. Each block is made from a shell made of substantially water-proof, chemically inert material and comprising a base having a pair of side walls and a pair of end walls defining a mold cavity for receiving structural material, each side wall having an inwardly directed recess extending substantially the length of the side wall and each end wall having a groove adapted to receive part of a fishplate to secure the shell to another shell in side-by-side relation. |
