Expandable rock bolt with indicator of clamping

Abstract

An expandable rock bolt which is formed with a expansion body having a transversal cross section that has a deformed shape which defines at least one lengthwise groove having ends that include caps with a filling component on an inlet side and an end component on an outlet side. The expandable rock bolt is further equipped with at least one indicator of clamping which is formed with a hollow tube which is made of an elastically compressible material and which is placed on a wall of the expansion body along which the indicator is taken out on a visible side for staff whereas at least in a part of an internal cavity of the tube of the indicator is placed an indication medium.

1 . An expandable rock bolt, comprising:
 an expansion body having:
 a transverse cross section having a shape that defines at least one lengthwise groove; 
 a first end and a second end that each comprise a cap; 
 an inlet side comprising a filling component; 
 an outlet side comprising an end component; and 
 a clamping indicator that comprises a hollow tube comprising an elastically compressible material that is disposed at a wall of the expansion body, wherein an internal cavity of the hollow tube comprises an indication medium. 
   
     
     
         2 . The expandable rock bolt according to the  claim 1 , wherein an inner end of the hollow tube is sealed, wherein a capsule is disposed within the internal cavity of the hollow tube, the capsule comprising an easily destructible material having ends that are sealed, wherein the capsule comprises the indication medium, and wherein a porous element is disposed at an end entry part of the internal cavity of the hollow tube. 
     
     
         3 . The expandable rock bolt according to the  claim 2 , further comprising a spacer that is disposed between a face of the capsule and the porous element to maintain a position of the capsule in the internal cavity. 
     
     
         4 . The expandable rock bolt according to the  claim 2 , wherein the entry part of the internal cavity of the hollow tube comprises a lens-end that comprises a transparent material and which is fixed to the hollow tube with a fixator. 
     
     
         5 . The expandable rock bolt according to the  claim 4 , wherein the lens-end comprises a lens shaped object. 
     
     
         6 . The expandable rock bolt according to the  claim 1 , wherein an inner end of the hollow tube is sealed and the internal cavity of the hollow tube is divided by a partition into two parts. 
     
     
         7 . The expandable rock bolt according to the  claim 1 , wherein an inner end of the hollow tube is sealed, wherein a set of capsules is disposed within the internal cavity of the hollow tube, wherein each of the set of capsules comprises an easily destructible material, and wherein a position of the set of capsules is maintained in the internal cavity by a plug. 
     
     
         8 . The expandable rock bolt according to any  claim 1 , wherein the clamping indicator comprises an extension tube that is coupled to the hollow tube, and wherein an end part of the extension tube comprises a lens-end that comprises a transparent material and that is fixed to the extension tube. 
     
     
         9 . The expandable rock bolt according to  claim 1 , wherein the indication medium comprises at least one of: (i) a coloured liquid medium, (ii) a single-base chemical compound, (iii) a multi-base chemical compound, (iv) a paste gel, (v) a foam, (vi) and a powder. 
     
     
         10 . The expandable rock bolt according to the  claim 3 , wherein the entry part of the internal cavity of the hollow tube comprises a lens-end that comprises a transparent material and which is fixed to the hollow tube with a fixator. 
     
     
         11 . The expandable rock bolt according to any  claim 3 , wherein the clamping indicator comprises an extension tube that is coupled to the hollow tube, and wherein an end part of the extension tube comprises a lens-end that comprises a transparent material and that is fixed to the extension tube. 
     
     
         12 . The expandable rock bolt according to any  claim 6 , wherein the clamping indicator comprises an extension tube that is coupled to the hollow tube, and wherein an end part of the extension tube comprises a lens-end that comprises a transparent material and that is fixed to the extension tube. 
     
     
         13 . The expandable rock bolt according to any  claim 7 , wherein the clamping indicator comprises an extension tube that is coupled to the hollow tube, and wherein an end part of the extension tube comprises a lens-end that comprises a transparent material and that is fixed to the extension tube. 
     
     
         14 . The expandable rock bolt according to  claim 2 , wherein the indication medium comprises at least one of: (i) a coloured liquid medium, (ii) a single-base chemical compound, (iii) a multi-base chemical compound, (iv) a paste gel, (v) a foam, (vi) and a powder. 
     
     
         15 . The expandable rock bolt according to  claim 3 , wherein the indication medium comprises at least one of: (i) a coloured liquid medium, (ii) a single-base chemical compound, (iii) a multi-base chemical compound, (iv) a paste gel, (v) a foam, (vi) and a powder. 
     
     
         16 . The expandable rock bolt according to  claim 4 , wherein the indication medium comprises at least one of: (i) a coloured liquid medium, (ii) a single-base chemical compound, (iii) a multi-base chemical compound, (iv) a paste gel, (v) a foam, (vi) and a powder. 
     
     
         17 . The expandable rock bolt according to  claim 5 , wherein the indication medium comprises at least one of: (i) a coloured liquid medium, (ii) a single-base chemical compound, (iii) a multi-base chemical compound, (iv) a paste gel, (v) a foam, (vi) and a powder. 
     
     
         18 . The expandable rock bolt according to  claim 6 , wherein the indication medium comprises at least one of: (i) a coloured liquid medium, (ii) a single-base chemical compound, (iii) a multi-base chemical compound, (iv) a paste gel, (v) a foam, (vi) and a powder. 
     
     
         19 . The expandable rock bolt according to  claim 7 , wherein the indication medium comprises at least one of: (i) a coloured liquid medium, (ii) a single-base chemical compound, (iii) a multi-base chemical compound, (iv) a paste gel, (v) a foam, (vi) and a powder. 
     
     
         20 . The expandable rock bolt according to  claim 8 , wherein the indication medium comprises at least one of: (i) a coloured liquid medium, (ii) a single-base chemical compound, (iii) a multi-base chemical compound, (iv) a paste gel, (v) a foam, (vi) and a powder.