US 12,326,086 B2
Apparatus for resin injection, mining machine and method
Pasi Ruotsalainen, Tampere (FI)
Assigned to Sandvik Mining and Construction Oy, Tampere (FI)
Appl. No. 18/033,004
Filed by SANDVIK MINING AND CONSTRUCTION OY, Tampere (FI)
PCT Filed Dec. 27, 2021, PCT No. PCT/EP2021/087691
§ 371(c)(1), (2) Date Apr. 20, 2023,
PCT Pub. No. WO2022/090581, PCT Pub. Date May 5, 2022.
Claims priority of application No. 20204134 (EP), filed on Oct. 27, 2020.
Prior Publication US 2023/0399947 A1, Dec. 14, 2023
Int. Cl. E21D 20/02 (2006.01); E21D 20/00 (2006.01)
CPC E21D 20/025 (2013.01) [E21D 20/00 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An apparatus for injecting grouting resin into a drilled hole for rock reinforcement, wherein the apparatus is arranged for feeding bulk fluid material, the apparatus comprising:
an injector head arranged to be inserted inside the drilled hole;
at least one fluid inlet arrangement connected to the injector head and arranged for feeding a resin base component and a resin catalyst to the injector head; and
an elongated tubular cover element surrounding the fluid inlet arrangement, wherein the injector head is provided with a mixing device arranged for mixing the fed resin base component and the catalyst together, whereby the mixing device is configured to be fed together with the injector head and the cover element inside the drilled hole, the injector head including a valve assembly located inside a flexible feed hose serving as the tubular cover element, wherein the injector head is a grouting resin feeding tool, wherein the grouting resin feeding tool is removed from the drilled hole when the resin feeding is completed and before a separate rock bolt is fed into the drilled hole filled with the grouting resin.