FOERFARANDE FOER KRAGINSTALLERING OCH GENOMFOERINGSKRAG.

摘要

PCT No. PCT/FI91/00012 Sec. 371 Date Jul. 10, 1992 Sec. 102(e) Date Jul. 10, 1992 PCT Filed Jan. 11, 1991 PCT Pub. No. WO91/10857 PCT Pub. Date Jul. 25, 1991.The invention relates to a conduit collar and method for installing the conduit collar in a circular hole through concrete and stone structures used in industrial construction work. The conduit collar includes at least one circumferential rib with an outer perimeter having a diameter larger than the diameter of the hole before the collar is installed into the hole. The outer perimeter of at least one of the circumferential ribs conforms to fit inside the hole when the collar is installed into the hole.