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CA-2986639-C - GROUT DELIVERY SYSTEM

CA2986639CCA 2986639 CCA2986639 CCA 2986639CCA-2986639-C

Abstract

A rock boll assembly (12) which includes a rock bolt with an elongate body (14) which extends between a distal end and a proximal end, a tubular sleeve (24) which sleeve longitudinally extends between a first end and a second end, on the rack bolt, a load bearing barrel (36) which is cent¬ rally bored to engage the rock bolt, which barrel (36) is adapted at a forward end to engage with the end of the sleeve (14) in sealing contact, and which barrel (36) has at least one grout conduit (48) between an exterior surface of the barrel and the bore, when the barrel (36) is engaged with the sleeve (14), and a seal which seals the grout passage to grout outflow but accommodates inflow of grout from a source.

Inventors

  • Paolo Ettore Pastorino
  • Adrian BERGHORST

Assignees

  • NCM INNOVATIONS (PTY) LTD

Dates

Publication Date
20260505
Application Date
20160623
Priority Date
20150623

Claims (9)

  1. 14 CLAIMS 1. A rock bolt assembly which includes a rock bolt with an elongate body which extends between a distal end and a proximal end, a tubular sleeve longitudinally extending between a first end and a second end, on the rock bolt such that proximal and distal ends of the bolt project from the first and second ends respectively of the sleeve, a load bearing barrel which has a central bore to engage the rock bolt between the first end of the sleeve and the proximal end of the bolt, which barrel is adapted at a forward end to engage with the second end of the sleeve in sealing contact, and which barrel has at least one grout conduit between an exterior surface of the barrel and the bore, which at least one conduit defines a part of a grout passage which communicates the exterior surface of the barrel with an interior of the sleeve when the barrel is engaged with the sleeve, a seal which seals the grout passage to grout outflow but accommodates inflow of grout from a source, a tubular spacer on the rock bolt between the first end of the sleeve and the forward end of the barrel or between the back end of the barrel and the tensioning means, wherein the tubular spacer is made of a suitable plastics material which deforms or breaks when a compressive force is applied to it to collapse or break away from the rock bolt, allowing the rock bolt to move longitudinally relatively to the sleeve between a first position and a second position, and a mechanical anchor engaged with the rock bolt on or towards the distal end, wherein the mechanical anchor is at least partially received within the sleeve in an unexpanded configuration when the rock bolt is in the first position and, wherein the mechanical anchor moves from the sleeve into an expanded configuration when the rock bolt is in the second position.
  2. 2. A rock bolt assembly according to claim 1 wherein the sleeve has a flared end section which opens onto the first end.
  3. 3. A rock bolt assembly according to claim 2 wherein the load bearing barrel is comprised of a solid body of a suitable metal material which has a domed or conical forward end and an opposed back end.
  4. 4. A rock bolt assembly according to any one of claims 1 to 3 wherein the barrel has a plurality of grout conduits.
  5. 5. A rock bolt assembly according to any one of claims 1 to 4 wherein the assembly includes a tensioning means between the proximal end of the bolt and the back end of the barrel.
  6. 6. A rock bolt assembly according to claim 5 wherein the tensioning means is a nut threaded onto the bolt.
  7. 7. A rock bolt assembly according to any one of claims 1 to 6 which includes a grout delivery coupling member which has a body with a member first end and a member second end and a passage between the ends, a circular distributing channel in a wall of the passage and a grout inlet port in a side of the member which communicates an exterior of the member with the channel, wherein the passage is adapted to at least partially receive the barrel from the member first end and to engage with the barrel in a position in which the at least one grout conduit of the barrel sealingly docks with the channel. 16
  8. 8. A rock bolt assembly according to claim 7 wherein the coupling member engages with the barrel in a twist-lock manner.
  9. 9. A rock bolt assembly according to claim 8 wherein the barrel or the coupling member has a plurality of bayonet type projections which engage with complementary slots or recesses on the coupling member or the barrel respectively.

Description

GROUT DELIVERY SYSTEM FIELD OF THE INVENTION [0001] The invention relates to an apparatus for grouting a rack bolt In a rock hole, BACKGROUND OF INVENTION 5 [0002] Grouting of a rock anchor within a rack hole is a difficult and messy affair. [0003] Typically, a grout conduit connected to a grout source needs to be attached to a grout pipe that projects from the rock hole. The problem is that the rock anchor installation is often at a height that is not easily reached. Moreover, there is a need for a connector to connect a nozzle end of the grout conduit to the grout pipe to 10 ensure a seated connection to prevent grout outflow from the connection interface. [0004] Also, in such an installation, the mouth of the rock hole needs to be sealed from grout egress once the rock hole is filled with grout. Therefore, in a typical grouted rock anchor installation, there am many points at which the grout can leak. [0005] The invention at least partially solves the aforementioned problems. IS SUMMARY OF INVENTION [0006] A rock bolt assembly which includes a rock bolt with an elongate body which extends between a distal end and a proximal end, a tubular sleeve which sleeve longitudinally extends between a first end and a second end, on the rock bolt such i that proximal and distal ends of the bolt project from the first and second ends respectively of the sleeve, a load bearing barrel which is centrally bored to engage the rock bolt between the first end of the sleeve and the proximal end of the bolt, which barrel is adapted at a forward end to engage with the second end of the $ sleeve in sealing contact, and which barrel has at feast one grout conduit between an exterior surface of the barrel and the bore, which at least one conduit defines a part of a grout passage which communicates the exterior surface of the barrel with an interior of the sleeve, when the barrel is engaged with the sleeve, and a seal which seals the grout passage to grout outflow but accommodates inflow of grout 1G from a source, [DOOT] The sleeve may have a flared end section which opens onto the first end. [GD08] The load bearing barrel may be comprised of a solid body of a suitable metal material which has a domed or conical forward end and an opposed back end. [0009] The barrel may have a plurality of grout conduits. The plurality of grout 15 passages may be evenly radially spaced about the body. [0010] The assembly may include a tensioning means. Preferably, the tensioning means is a nut threaded on the belt between the proximal end of the bolt and the back end of the barrel. [0011] The assembly may Include a tubular spacer on the rock bolt between the first 20 end of the sleeve and the forward end of the barrel or between the back end of the barrel and the tensioning means. 2 [0012] The tubular spacer may be made of a suitable plastics materiel which deforms or breaks when a compressive force is applied to it to collapse or break away from the rock boit, allowing the rock bolt to move longitudinally relatively to the sleeve between a first position and a second position. 5 [0013] The assembly may include a mechanical anchor engaged with the rock bolt on or towards the distal end. [0014] The mechanical anchor may be at least partially received within the sleeve in an unexpanded configuration when the rock bolt Is in the first position. [0015] The mechanical anchor may move from the sleeve into an expanded 10 configuration when the rock bolt is in the second position. [001S] The assembly may include a grout delivery coupling member which includes a body with a member first end and a member second end and a passage between the ends, a circular distributing channel in a wall of the passage end a grout inlet port in a side of the member which communicates an exterior of the member with the IS channel, wherein the passage is adapted to at least partially receive the barrel from the member first end and to engage with the barrel in a position in which the at least one grout conduit of the barrel sealingly docks with the channel. [0G17] The coupling member may engage with the barrel in a twist-lock manner. [0018] The barrel, alternatively the coupling member, may have a plurality of 20 bayonet type projections which engage with complementary slots or recesses on the coupling member, alternatively the barrel. 3 [001S] A grouting kit for grouting a rock bolt in a rock bote which includes a load bearing barrel which is centrally bored to engage with the rock bolt and which has at least one grout conduit between an exterior surface of the barrel and the bore and a seal which seals the grout conduit, and a grout delivery coupling member which 5 includes a body with a first end and a second end and a passage between the ends, a circular distributing channel in a wall of the cylindrical passage and a grout inlet port In a side of the member which communicates an exterior of the member with the channel, wherein the passage is adapted to receive the barrel