An apparatus for injecting grouting resin into a drilled hole for rock reinforcement; wherein the apparatus is for feeding bulk-like fluid material and comprises: an injector head which is to be inserted inside the drilled hole, the injector head being a grouting resin feeding tool, whereby the 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 (23a, 23b); at least one fluid inlet arrangement connected to the injector head for feeding a resin base component A and a resin catalyst B to the injector head; wherein the injector head is provided with a mixing device for mixing the fed resin base component A and the catalyst B together, whereby the mixing device is configured to be fed together with the injector head inside the drilled hole; the fluid inlet arrangement comprises two separate feed lines, wherein a first feed line is selectable for alternative feeding of a first resin base component A1 and a second resin base component A2 associated to two different setting times, and wherein a second feed line is for a resin catalyst B; the apparatus comprises a resin pumping arrangement provided with two pumps wherein a common first feed pump is configured to feed alternatively the first resin base component A1 or the second resin base component A2 to the first feed line and a second feed pump is dedicated for feeding the catalyst B to the second feed line; and wherein the apparatus comprises at least one feed valve for selectively connecting an inlet channel of the common first feed pump to a first container provided for the first resin base component A1, or to a second container provided for the second resin base component A2. an injector head which is to be inserted inside the drilled hole, the injector head being a grouting resin feeding tool, whereby the 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 (23a, 23b); at least one fluid inlet arrangement connected to the injector head for feeding a resin base component A and a resin catalyst B to the injector head; wherein the injector head is provided with a mixing device for mixing the fed resin base component A and the catalyst B together, whereby the mixing device is configured to be fed together with the injector head inside the drilled hole; the fluid inlet arrangement comprises two separate feed lines, wherein a first feed line is selectable for alternative feeding of a first resin base component A1 and a second resin base component A2 associated to two different setting times, and wherein a second feed line is for a resin catalyst B; the apparatus comprises a resin pumping arrangement provided with two pumps wherein a common first feed pump is configured to feed alternatively the first resin base component A1 or the second resin base component A2 to the first feed line and a second feed pump is dedicated for feeding the catalyst B to the second feed line; and wherein the apparatus comprises at least one feed valve for selectively connecting an inlet channel of the common first feed pump to a first container provided for the first resin base component A1, or to a second container provided for the second resin base component A2.