INSPECTION WELL HATCH Russian patent published in 2007 - IPC E02D29/12 E02D29/14 

FIELD: construction and community facilities, particularly hatches for inspection wells, underground distribution pipelines, cellars, road pavings and other structures.

SUBSTANCE: inspection well hatch comprises support ring with orifice, reinforcing belt extending along inner contour thereof, support base, reinforcing cage and lid. The reinforcing cage includes inner ring of sheet metal and/or profiled metal and round steel rod connected thereto by means of fixedly secured partitions. Lid has support surface and reinforcing cage including outer ring made of sheet metal and/or profiled metal, lower reinforcing mesh fixedly connected thereto, round steel rod and upper reinforcing mesh. The reinforcing cages are filled with non-metal binding material. The round steel rods of support ring and lid are pre-stressed and cooperate with at least 12 reinforcement posts uniformly distributed along annular rod perimeter inside thereof.

EFFECT: increased strength, crack-resistance and rigidity under the action on outer vertical dynamic load, increased service life, reliability and workability duration, as well as extended fatigue limit and vehicle safety during vehicle passage over hatch.

1 cl, 11 dwg