| 摘要 |
A liner (34) for an access chamber to a tank (68) connector (66) comprises a first portion (36) defining a chamber (38), a second neck portion (40) of smaller cross-sectional area than the first portion and a third portion (42) of greater cross- sectional area than the portion (40) and adapted to provide a housing for a frame (11) to support a manhole cover (10). The portion (40) inter-connects the portions (36, 42). The chamber is formed by positioning the liner (34) and pouring concrete (58) in situ round the liner (34), metal reinforcements (62) being incorporated in the concrete. Concrete adjacent the portion (40) is situated beneath the third portion (42) (and frame 11) to provide a beam (60) supporting the third portion (42) and frame (11). The cover (10) has reinforced beams (20). A cover, suitable for use as above, comprises a body portion of fibre-reinforced plastics material, a peripheral portion adapted to seat in corresponding frame means, and a lower face having thereon a plurality of integrally formed reinforcing beams. <IMAGE> |
