INSPECTION WELL MANHOLE Russian patent published in 2008 - IPC E02D29/14 

FIELD: construction industry.

SUBSTANCE: inspection well manhole consists of casing with through holes made in the side wall and support band. Casing is installed on support platform. At least three planks are attached to casing side wall inner surface under support band, and with their other ends they are attached to manhole inner side wall. Cover with through holes and cutouts from outer surface side, wherein locking devices are mounted, is installed on casing support band, and lugs either in the form of ribs, or a solid ring are provided on inner surface. Locking device is made in the form of locking screw with a cap designed for a special wrench and lead-screw nut with locking lever rigidly fixed thereon and contacting the casing side wall and support band lower plane when being locked, and one of cover's lugs when being opened. Ring is rigidly fixed on lower locking screw end. Inspection well manholes and street storm-water inlets of any configuration can be designed according to the proposed technical solution. At that manhole covers and street inlets' grids can either be freely supported on casings, or hinged to them.

EFFECT: simple and secure attachment of manhole casing to well walls, simple construction of locking device, secure attachment of cover to casing of any configuration, and installation and removal of cover without using lifting devices.

4 cl, 8 dwg