US 12,134,969 B2
Adhesively anchored rock bolt assembly
Paolo Ettore Pastorino, Johannesburg (ZA); and Rual Abreu, Johannesburg (ZA)
Assigned to INNOVATIVE MINING PRODUCTS (PTY) LTD, Johannesburg (ZA)
Appl. No. 17/801,163
Filed by INNOVATIVE MINING PRODUCTS (PTY) LTD, Johannesburg (ZA)
PCT Filed Mar. 31, 2021, PCT No. PCT/ZA2021/050023
§ 371(c)(1), (2) Date Aug. 19, 2022,
PCT Pub. No. WO2021/203147, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020/01766 (ZA), filed on Apr. 1, 2020.
Prior Publication US 2023/0070897 A1, Mar. 9, 2023
Int. Cl. E21D 20/02 (2006.01); E21D 21/00 (2006.01)
CPC E21D 20/025 (2013.01) [E21D 21/0026 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A rock bolt assembly comprising:
a rock bolt with a rigid elongate body which extends between a distal end and a proximal end and which has,
at least one integrally formed anchor portion, comprising paddle formations, and
a plurality of separate cylindrical stem portions,
a tubular sleeve, of a metal material, which longitudinally extends between a first end and a second end, the tubular sleeve having a continuous first diameter over at least a portion of the tubular sleeve, the tubular sleeve partially encasing the rock bolt such that at least a proximal end portion of the bolt projects from the first end of the sleeve, and
a grout-input element which engages the rock bolt on the proximal end portion and which engages the first end of the sleeve in sealing contact,
wherein, over each stem portion, the tubular sleeve is adapted along at least one band section by a reduction in the first diameter in at least one diametric plane, and
wherein, over the at least one anchor portion, the tubular sleeve retains the first diameter.