Patent ID: 11891837
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A system comprising:
a cover, the cover having a circular cross section, the cover defining a set of spaced slots disposed around an outer circumference of the cover, each slot of the set spaced slots:
having a first edge and a second edge, wherein each of the first edge and the second edge extends from the outer circumference of the cover in a direction toward a center of the cover to a terminus, the terminus having a curved shape;
having a width and a depth, wherein the depth of each slot is at least two times the width of each slot as measured at the outer circumference of the cover, the width of each slot narrower near the terminus of each slot than as measured at the outer circumference of the cover;

a set of frame segments, the set of frame segments coupleable to the outer circumference of the cover; and
a set of foam segments, the set of foam segments coupleable to the outer circumference of the cover.