Floating precast manhole and catch basin cover systems

A floating catch basin cover system to be installed on a catch basin shaft having an inner opening and an outer diameter, and a road base, said system comprising:

• a. a precast-ring having a square or a circular inner opening to align with the inner opening of the catch basin;
• an outer diameter being at least 25 cm larger than the outer diameter of the catch basin;
• a top surface to engage with the road's top finish;
• a bottom surface to engage with the road base through a cast-in-place concrete;
• b. a catch basin cover receiving means casted in the precast-ring to receive a catch basin cover frame;
• c. a leveling means accessible from the top surface and extending out of said bottom surface to engage with but not attached to the catch basin to level and adjust the level and slop of the precast-ring with the road wherein said leveling means provides a gap between said precast-ring and said catch basin;
• d. a sealing tube placed in said gap, wherein said sealing tube having a top end to attach to said precast-ring and a bottom end to attach to said catch basin, thereby preventing flow of any gases out of the catch basin and inflow of surface rain water and underground water into the catch basin,
• wherein said gap between the bottom of the precast-ring and the top of the catch basin is sealed with an insulating spray foam,
• whereby said precast-ring is independent of said catch basin and moves with respect to the heave action of the road and the road base.

A method of installing a manhole cover, comprising:

• a. obtaining a floating precast manhole cover system having a manhole-cover-ring, a precast-ring, a set of leveling legs;
• b. cutting around a manhole-shaft to a predetermined distance from the edge of the manhole-cover-ring using a circular extractor, and exposing the top of a manhole shaft wall;
• c. obtaining an insulation membrane with a predetermined size and placing said insulation around the manhole-shaft wall;
• d. compacting an exposed road base around the manhole shaft wall;
• e. placing said precast-ring on top of the manhole using a lifter so that the levelling legs sit on top of the manhole shaft wall;
• f. leveling the top of the manhole cover ring with the road top level and slope of the road in two direction, by adjusting the height of the levelling legs;
• g. filling a gap between the road base and the precast ring with a fresh cast-in-place-concrete up to the top of the precast ring;
• h. insulating a gap between the bottom of the precast ring and the top of the manhole shaft wall using an insulating spray or an insulation membranes;
• and
• i. installing an accordion shape rubber gasket between said precast-ring and said manhole-shaft using clamping means to secure and seal said gasket.