Patent ID: 8801337

Claim:
A method for attaching a plate to an interior of an underground excavation, said method comprising: placing a first surface of said plate adjacent to said interior of said excavation, said plate having at least one passageway disposed within said plate; forming a mounting hole within said excavation in alignment with said passageway; inserting a bolt from a second surface of said plate opposite said first surface through said passageway and into said mounting hole; said bolt comprising: a shaft comprising a terminal end and an end opposite said terminal end, said opposite end terminating in an annular radius, a washer portion having first and second sides, said first side of said washer portion being integrally attached to said annular radius and disposed directly adjacent and abutting said second surface of said plate; a dome portion being integrally attached to said second side of said washer portion, such that said dome portion extends in a convex manner away from said first side of said washer portion; and a driver connected to said dome portion; wherein said annular radius has a radius of curvature and said dome portion extends in a convex manner along a radius of curvature away from said driver, and wherein said radius of curvature of said annular radius is less than said radius of curvature of the dome portion; driving said bolt into through said passageway and said mounting hole by means of said driver; and securing said shaft of said bolt to said mounting hole disposed within said excavation via an anchorage device, adhesive or grout.