MAN-HOLE Russian patent published in 2003 - IPC

FIELD: construction of underground urban service lines. SUBSTANCE: proposed man-hole includes immobile shell and upper part with man- hole cover mounted for movement along height. This upper part has bearing protrusion arranged around edges which lower surface has broken configuration forming horizontal platform bordering on external wall of upper part and transferring to supporting platform inclined at angle of 10-40 degrees with surface of pavement. Bearing protrusion is positioned in pavement flush with its upper surface with formation of clearance between horizontal platform of protrusion and surface of pavement base. EFFECT: provision for mobile upper part to follow automatically changes of level of pavement. 2 dwg