Document FR-2 376 919, for example, discloses a manhole which comprises a frame which is intended to be fixed in the ground and a lockable cover which closes the frame. The frame comprises an annular flat bottom plate and a substantially cylindrical skirt.
The cross-section of the bottom plate is substantially identical over the entire circumference thereof and, consequently, the frame is only weakly anchored in the fixing material.
The object of the invention is to provide a frame for a roadway device, in particular for a manhole, which allows better anchoring in the fixing material.