| 摘要 |
An inspection pit hatch cover includes a spherical concrete disc, with the lower horizontal bearing surface, metal frame and fiber with anchors placed in the concrete disc. The spherical concrete disc is arranged as a two-stage one, with the upper bearing stage reinforced with metal frame, and the lower center stage, and fiber is placed in concrete of the disc. At that on the spherical surface of the disc two through elliptical openings are provided, those are placed symmetrically at diameter of the disc at different sides with respect to center. |
