Rock bolt with meshing adapter

Patent metadata

Field	Value
Publication number	US-11028692-B2
Application number	US-201816766959-A
Country	US
Kind code	B2
Filing date	Nov 12, 2018
Priority date	Nov 27, 2017
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A rock bolt and meshing assembly is arranged for installation of a meshing sheet against a surface of rock strata. The rock bolt includes an adapter having a first portion connectable to a trailing end of an elongate shaft of the rock bolt and means configured to receive and mount a meshing clamp to overlay a second section of meshing sheet against an already laid first section of meshing sheet.

First claim

The invention claimed is:

1. A rock bolt for installation within a bore formed in rock strata, the rock bolt comprising:
an elongate shaft having a leading end for installation into the bore and a trailing end arranged to project from an open end of the bore;
a nut secured to the trailing end of the elongate shaft; and
an adaptor having a connection portion, a body and a mesh clamp extending along a longitudinal axis of the bolt, the connection portion including an external facing surface and an internal thread, the internal thread being arranged to mate with an external thread of the nut so as to be connected to the nut at the trailing end of the elongate shaft, the body having an internal facing surface arranged to mate with the external facing surface of the connection portion, wherein the mesh clamp is arranged at the body or axially between an axially forwardmost part at an end of the connection portion and the body, such that the body is drivable axially on the connection portion via the engagement between the internal facing surface and the external facing surface to force the mesh clamp towards the trailing end of the elongate shaft and to bare against and urge a meshing sheet into contact with a surface of the rock strata.

2. The rock bolt as claimed in claim 1 , wherein the connection portion includes an extension extending axially from said forwardmost part, wherein the mesh clamp is arranged to be mounted on the extension between said forwardmost part and the body.

3. The rock bolt as claimed in claim 2 , wherein at least a region of the connection portion includes an external thread at the external facing surface and at least a region of the body includes an internal thread arranged to mate with the external thread of the connection portion such that the body is axially driveable along the connection portion via the internal and external threads.

4. The rock bolt as claimed in claim 3 , wherein the external thread is provided at the extension.

5. The rock bolt as claimed in claim 3 , wherein the body includes a nut head and a nut collar, the internal thread of the body being provided at the collar such that the collar is axially drivable over and along the connection portion to force the mesh clamp towards the trailing end of the elongate shaft.

6. The rock bolt according to claim 5 , wherein the mesh clamp includes an opening through which a portion of the body extends axially between the nut head and the nut collar.

7. The rock bolt according to claim 6 , wherein the mesh clamp has a base in which the opening is formed and arms that extend from the base to a ring configured for engagement of the meshing sheet.

8. The rock bolt according to claim 7 , wherein the base is planar and extends generally perpendicular to the axis of the rock bolt.

9. The rock bolt according to claim 6 , wherein the mesh clamp has a base in which the opening is formed and a skirt extends from the base, wherein the skirt has a distal end remote from the base for engagement with the meshing sheet.

10. The rock bolt according to claim 9 , wherein the base is planar and extends generally perpendicular to an axis of the rock bolt.

11. The rock bolt according to claim 3 , wherein the internal thread of the connection portion is formed within a socket at said forwardmost part from which the extension projects.

12. The rock bolt according to claim 11 , wherein the body is a nut rotatable on the extension towards said forwardmost part to drive axially the mesh clamp towards the socket.

13. The rock bolt according to claim 2 , wherein the mesh clamp includes an opening through which the extension extends.

14. The rock bolt according to claim 13 , wherein the opening has an internal diameter that is greater than an external diameter of the extension so that the mesh clamp is a loose fit about the extension.

15. The rock bolt according to claim 1 , wherein the body includes a first fixed connection to the connection portion, whereby installation equipment can rotate the body to rotate both the body and the adapter together for threadably connecting the adapter to the trailing end of the elongate shaft of the rock bolt.

16. The rock bolt according to claim 15 , wherein the first fixed connection of the body to the connection portion includes a shear pin extending between the body and the connection portion.

17. The rock bolt according to claim 15 , wherein the first fixed connection of the body to the connection portion comprises a spot weld or braze, gluing or crimping between the body and the connection portion.

18. The rock bolt according to claim 1 , wherein the body is mounted to the connection portion via a friction fit and the body is movable axially along the connection portion by application of a load applied to the body which is sufficient to overcome a friction connection between the body and the connection portion.

19. A meshing assembly for installation of meshing sheet against a surface of rock strata, the meshing assembly comprising:
a rock bolt as claimed in claim 1 ;
a first section of meshing arranged to be positioned against the surface of the rock strata;
a rock plate connectable to the trailing end of the rock bolt to bear against and urge the first section into contact with the surface of the rock strata;
a second section of meshing arranged to be positioned against the surface of the rock strata and overlapping the first section; and
a meshing clamp connectable to the connection portion and configured to bear against and urge the second section into contact with the surface of the rock strata.

Assignees

• Sandvik Intellectual Property

Inventors

• Rataj Mieczyslaw
• Darlington Bradley
• Young Peter
• Roach Warren

Classifications

• E21D11/006 Primary

  Lining anchored in the rock (setting anchoring-bolts E21D20/00; anchoring-bolts E21D21/00) · CPC title

• E21D21/008 Primary

  Anchoring or tensioning means · CPC title

• E21D11/40

  Devices or apparatus specially adapted for handling or placing units of linings {or supporting units} for tunnels or galleries {(combined with tunnelling shields E21D9/06)} · CPC title

• E21D21/0026

  characterised by constructional features of the bolts · CPC title

• E21D21/0093

  Accessories · CPC title