Rock anchor

Abstract

A system including a chemical rock anchor and a device for injecting a fixative, the rock anchor including an anchor tube enclosing a cavity. The device includes at least one holding chamber containing the fixative, a tube into which the at least one holding chamber is integrated, permits injection of a fixative into a space between an anchor tube and a hole that has been drilled into the rock, while requiring little technical effort and permitting a controlled process. The tube can be inserted into the cavity, and/or the tube and the anchor tube are separate parts, and/or the tube is not attached to the anchor tube, and/or the system does not include any fastening means for the bonding and/or non-positive fastening of the tube to the anchor tube.

1 . A system comprising:
 a chemical rock anchor including an anchor tube enclosing a cavity; and   an injector for injecting a fixative, the injector including at least one holding chamber containing the fixative, a tube, the at least one holding chamber integrated in the tube, at least system further including at least one of the following:   the tube being insertable into the cavity;   the tube and the anchor tube being separate parts;   the tube not being attached to the anchor tube; and   the system lacking a fastener for the bonding or non-positive fastening the tube to the anchor tube.   
     
     
         2 . The system as recited in  claim 1  wherein the rock anchor is a mining rock anchor. 
     
     
         3 . The system as recited in  claim 1  further comprising an anchor nut. 
     
     
         4 . The system as recited in  claim 3  further comprising an anchor plate supported by the anchor nut for contact with the rock. 
     
     
         5 . The system as recited in  claim 1  wherein the tube is insertable into the cavity after the anchor tube has been inserted into a hole drilled into the rock. 
     
     
         6 . The system as recited in  claim 1  wherein the system lacks any fastener fastening the tube to the anchor tube. 
     
     
         7 . The system as recited in  claim 1  wherein the outer diameter of the tube essentially matches the diameter of the cavity. 
     
     
         8 . The system as recited in  claim 1  wherein the injector comprises a conveyor for conveying the fixative outside of the tube into a space between the anchor tube and a hole drilled into a rock when the tube has been inserted into the cavity. 
     
     
         9 . The system as recited in  claim 1  wherein the at least one holding chamber is configured as at least one chamber delimited by the walls of the tube, as at least one cartridge or as at least one pouch. 
     
     
         10 . The system as recited in  claim 8  wherein the conveyor includes a piston or a plunger. 
     
     
         11 . The system as recited in  claim 10  wherein the device includes an actuator actuating the piston or plunger mechanically, hydraulically or pneumatically and further includes a sealing plate for the tube. 
     
     
         12 . The system as recited in  claim 11  wherein the actuator is a high-pressure pump. 
     
     
         13 . The system as recited in  claim 1  wherein the fixative is a synthetic resin having an adhesive component and a curing component, and the adhesive and curing components are stored separately in two holding chambers of the at least one holding chamber. 
     
     
         14 . The system as recited in  claim 1  wherein at least one of the following is present: the system further includes at least one of a mixer for mixing the fixative; the injector includes a magazine containing several tubes; and the rock anchor includes a drill head on a back end of the anchor tube. 
     
     
         15 . The system as recited in  claim 14  wherein the injector includes the mixer. 
     
     
         16 . A method for affixing a rock anchor into rock, comprising the following steps:
 drilling a hole into the rock;   inserting the rock anchor into the drilled hole;   storing a fixative in at least one holding chamber;   conveying the fixative into a space between an anchor tube of the rock anchor and the rock;   bonding the anchor tube with the fixative to the rock;   curing the fixative; and   after the fixative has been conveyed into the space between the anchor tube and the rock, at least one of a tube and the at least one holding chamber is pulled out of a cavity enclosed by the anchor tube.   
     
     
         17 . The method as recited in  claim 16  wherein the at least one holding chamber is integrated into or arranged in the tube. 
     
     
         18 . The method as recited in  claim 16  wherein the tube is arranged inside the cavity enclosed by the anchor tube. 
     
     
         19 . The method as recited in  claim 16  wherein the space is an annular space. 
     
     
         20 . The method as recited in  claim 16  wherein at least one of the following is present:
 while the fixative is being injected into the cavity, the fixative does not flow; 
 while the fixative is being conveyed, the fixative flows into the space between the anchor tube and the rock; and 
 the fixative, at first stored in the at least one holding chamber, is injected into the cavity and subsequently, the fixative is conveyed into the space between the anchor tube and the rock. 
 
     
     
         21 . The method as recited in  claim 20  wherein while the fixative is being injected into the cavity, the anchor tube is arranged in the drilled hole, or the anchor tube has been inserted into the drilled hole. 
     
     
         22 . The method as recited in  claim 16  wherein the fixative is injected into the cavity when the at least one holding chamber is inserted into the cavity. 
     
     
         23 . The method as recited in  claim 22  wherein at least one holding chamber is integrated into or arranged in the tube. 
     
     
         24 . The method as recited in  claim 22  wherein the tube is inserted into the cavity while the anchor tube is already arranged in the drilled hole. 
     
     
         25 . The method as recited in  claim 16  wherein the fixative is conveyed out of the at least one holding chamber into the space by at least one conveyor for conveying the fixative. 
     
     
         26 . The method as recited in  claim 25  wherein the conveyor is a mechanically, hydraulically or pneumatically moved piston or plunger. 
     
     
         27 . The method as recited in  claim 16  wherein the fixative is configured as a synthetic resin having an adhesive component and a curing component, the adhesive and curing components being stored separately in two separate holding chambers of the at least one holding chamber and being injected into the cavity, and, while the fixative is being conveyed into the space between the anchor tube and the hole, the adhesive component and the curing component are mixed together in a mixing element. 
     
     
         28 . The method as recited in  claim 16  wherein the at least one holding chamber is destroyed by a conveyor for conveying the fixative or the drilled hole is created by a separate drill rod or by the rock anchor fitted with a drill head. 
     
     
         29 . The method as recited in  claim 28  wherein the at least one holding chamber is configured as a cartridge or pouch. 
     
     
         30 . The method as recited in  claim 28  wherein the at least one holding chamber is destroyed after introduction into the cavity. 
     
     
         31 . The method as recited in  claim 16  wherein a system is used to perform the method, the system comprising: a chemical rock anchor including an anchor tube enclosing a cavity; and an injector for injecting a fixative, the injector including at least one holding chamber containing the fixative, a tube, the at least one holding chamber integrated in the tube, at least system further including at least one of the following: the tube being insertable into the cavity; the tube and the anchor tube being separate parts; the tube not being attached to the anchor tube; and the system lacking a fastener for the bonding or non-positive fastening the tube to the anchor tube. 
     
     
         32 . A device for injecting a fixative into a space between an anchor tube and a drilled hole, the device comprising:
 at least one holding chamber containing the fixative; and   at least one of the following:
 the at least one holding chamber is configured inside a tube, so that the tube can be inserted into a cavity enclosed by the anchor tube after the anchor tube has been inserted into the drilled hole; and 
 a conveyor can convey the fixative in the case of the being tube arranged in the cavity. 
   
     
     
         33 . The device as recited in  claim 32  further comprising the conveyor for conveying the fixative into the space. 
     
     
         34 . The device as recited in  claim 32  wherein several tubes are arranged in a magazine.