A method of installing a cable bolt, a system and components of same

Abstract

A method of installing a grouted cable bolt, a system for providing same and components which may form part of the method and/or system including a delivery assembly comprising a delivery nozzle at a distal end of the delivery assembly; a mixing chamber in fluid communication with the delivery nozzle; a first line for conveying a first component to the mixing chamber; and, a second line for conveying a second component to the mixing chamber the first line being located within the second line, and wherein the hardenable composition in liquid form is formed from mixing the first component with the second component.

1 . A method of installing a cable bolt within a borehole including an open end and an inner surface leading away from the open end towards a blind end, the method including the following steps:
 (a) delivering a hardenable composition in liquid form at or near the blind end of the borehole via a delivery assembly and substantially filling the borehole with the hardenable composition from the blind end towards the open end of the borehole wherein the hardenable composition is formed from two components, a first component and a second component which when mixed form the hardenable composition in liquid form, the delivery assembly including a first line for delivering the first component and a second line for delivering the second component the first line being located within the second line;   (b) introducing an anchor end of the cable bolt to the open end of the borehole and pushing the anchor end of the cable bolt through the hardenable composition in liquid form until the anchor end of the cable bolt is proximate to the blind end of the borehole; and,   (c) allowing the hardenable composition to harden.   
     
     
         2 . The method according to  claim 1  wherein the delivery assembly is withdrawn from the borehole at one of a same or similar rate as the rate at which the borehole is filled with the hardenable composition. 
     
     
         3 . The method according to  claim 1  wherein the first component and the second component are mixed in a mixing chamber in the delivery assembly prior to delivering the hardenable composition in the liquid form;
 the delivery assembly includes a delivery nozzle at a distal end for delivering the hardenable composition to the borehole; and 
 the first line and the second line deliver the first component and the second component to the mixing chamber which is in fluid communication with the delivery nozzle, with the mixing chamber being located immediately before the delivery nozzle on the delivery assembly. 
 
     
     
         4 . (canceled) 
     
     
         5 . (canceled) 
     
     
         6 . The method according to  claim 3  wherein the mixing chamber is located immediately before the delivery nozzle on the delivery assembly, with the mixing chamber includes a static mixer located therein for assisting with the mixing of the first component and the second component, with the static mixer is a helical static mixer. 
     
     
         7 . (canceled) 
     
     
         8 . (canceled) 
     
     
         9 . The method according to  claim 3  wherein the mixing chamber and the delivery nozzle are one or more of located within the borehole during step (a) and proximate the blind end of the borehole at a commencement of step (a). 
     
     
         10 . (canceled) 
     
     
         11 . The method according to  claim 1  wherein the first line is located within and substantially coaxial with the second line. 
     
     
         12 . The method according to  claim 11  wherein the delivery assembly further includes an adaptor with a first port and a second port located at one end, the first port for connecting to a source line of the first component to the adaptor and the second port for connecting a source line of the second component to the adaptor, the adapter configured to deliver the first component to the first line via the first port, and to deliver the second component to the second line via the second port. 
     
     
         13 . The method according to  claim 1  wherein the hardenable composition hardens at least three minutes after step (a) and preferably at least five minutes after step (a). 
     
     
         14 . The method according to  claim 1  wherein the blind end is orientated at a higher level than the open end and wherein the hardenable composition includes sufficient anti slump properties whereby the hardenable composition is retained within the borehole after step (a). 
     
     
         15 . The method according to  claim 1  wherein the hardenable composition is selected from a two component resin consisting of a resin and a hardener, or a two component cementitious grout. 
     
     
         16 . The method according to  claim 3  wherein the method further includes a flushing step after step (a) wherein at least one of the first component and second component remaining in at least one of the mixing chamber and the delivery nozzle of the delivery assembly are flushed therefrom. 
     
     
         17 . (canceled) 
     
     
         18 . The method according to  claim 1  wherein the borehole has a cross sectional diameter of less than 45 mm. 
     
     
         19 . (canceled) 
     
     
         20 . (canceled) 
     
     
         21 . A delivery assembly for introducing a hardenable composition in liquid form to a borehole, the delivery assembly including:
 a delivery nozzle at a distal end of the delivery assembly;   a mixing chamber in fluid communication with the delivery nozzle;   a first line for conveying a first component to the mixing chamber; and   a second line for conveying a second component to the mixing chamber the first line being located within the second line, and wherein the hardenable composition in liquid form is formed from mixing the first component with the second component.   
     
     
         22 . The delivery assembly according to  claim 21  wherein the first line is located within and substantially coaxial with the second line. 
     
     
         23 . The delivery assembly according to  claim 21  wherein the mixing chamber comprises a static mixer located therein for assisting with the mixing of the first component and the second component, with the static mixer being a helical static mixer. 
     
     
         24 . (canceled) 
     
     
         25 . The delivery assembly according to  claim 21  further including an adaptor with a first port and a second port located at one end, the first port for connecting to a source line of the first component to the adaptor and the second port for connecting a source line of the second component to the adaptor, the adaptor configured to deliver the first component to the first line via the first port, and to deliver the second component to the second line via the second port. 
     
     
         26 . The delivery assembly according to  claim 21  further including a connector in fluid communication with the first line and the second line, the connector configured to deliver the first component and the second component to the mixing chamber. 
     
     
         27 . The delivery assembly according to  claim 21  wherein the delivery assembly has a cross sectional diameter of less than 40 mm. 
     
     
         28 . (canceled) 
     
     
         29 . A system for installing a cable bolt within a borehole including an open end and an inner surface leading away from the open end towards a blind end, the system including the following:
 i. a delivery assembly for introducing a hardenable composition in liquid form to a borehole, the delivery assembly including a delivery nozzle at a distal end of the delivery assembly; a mixing chamber in fluid communication with the delivery nozzle; a first line for conveying a first component to the mixing chamber; a second line for conveying a second component to the mixing chamber the first line being located within the second line, and wherein the hardenable composition in liquid form is formed from mixing the first component with the second component including a liner open end and a liner blind end;   ii. a source of the first component for delivery to the first line; and   iii. a source of the second component for delivery to the second line.   
     
     
         30 . A system according to  claim 29  wherein the first line of the delivery assembly is located within and coaxial with the second line of the delivery assembly. 
     
     
         31 . The system according to  claim 29  wherein the mixing chamber of the delivery assembly includes a static mixer located therein for assisting with the mixing of the first component and the second component, with the static mixer being a helical static mixer. 
     
     
         32 . (canceled) 
     
     
         33 . The system according to  claim 29  wherein the delivery assembly further includes an adaptor with a first port and a second port located at one end, the first port for connecting to the source of the first component to the adaptor and the second port for connecting the source of the second component to the adaptor, the adaptor configured to deliver the first component to the first line via the first port, and to deliver the second component to the second line via the second port. 
     
     
         34 . The system according to  claim 29  wherein the delivery assembly further includes a connector in fluid communication with the first line and the second line, the connector configured to deliver the first component and the second component to the mixing chamber. 
     
     
         35 . The system according to  claim 29  wherein the delivery assembly has a cross sectional diameter of less than 40 mm. 
     
     
         36 . (canceled)