MANHOLE Russian patent published in 2009 - IPC E02D29/12 

FIELD: construction.

SUBSTANCE: invention is related to the field of construction. Manhole body comprises frame and door, besides frame is arranged with longitudinal slots at internal surfaces of upper and lower shelves of frame, and door - with longitudinal openings arranged along upper and lower shelves of door. Door is installed in frame with the possibility of longitudinal and transverse displacement in it, and also axial rotation, which is provided by installation of axis of bearings in frame that is displaced along longitudinal slots of frame and passing through longitudinal openings arranged in upper and lower shelf of door. Moreover, frame and door of manhole may be made from metal angle section bar.

EFFECT: simplified process of manhole operation, expansion of application field, and also improved main operational properties.

2 cl, 2 dwg