WO2021159173A1

WO2021159173A1 - Resin cartridge

Info

Publication number: WO2021159173A1
Application number: PCT/AU2021/050108
Authority: WO
Inventors: Peter Bryce Catoi
Original assignee: Peter Bryce Catoi
Priority date: 2020-02-11
Filing date: 2021-02-10
Publication date: 2021-08-19

Abstract

A resin cartridge (10) comprising an inner tube (12) and an outer tube (14) such that the inner tube 12 is received within the outer tube (14). The inner tube (12) 5 has a central bore through which a shaft (13) of a rock bolt (11) may be received. A two-part resin is provided in an annular space between the inner and outer tubes (12, 14). An outer surface of the inner tube (12) includes a plurality of outer protrusions such that rotating the shaft (13) of the rock bolt (11) causes rotation of the inner tube (12) and thereby mixing of the resin by the 10 outer protrusions.

Description

“RESIN CARTRIDGE”

Field of the Invention

[001] The present invention relates to a resin cartridge for use with rock bolts.

Background to the Invention

[002] Rock bolts are used for stabilising the surface of an excavated area. Such rock bolts are inserted into a drilled hole in the rock face and secured in place by mechanical and/or adhesive means to the inner end of the hole. The rock bolt thereby transfers force from around the surface of the excavated area to the more stable rock near the inner end of the drilled hole.

[003] Mechanical rock bolts generally utilise an expanding component located adjacent an inner end of the hole. The outer end of the rock bolt is then clamped to the surface of the rock face and tensioned. Adhesive is also generally used with such rock bolts in order to spread the load over a greater length. The adhesive also seals around the metal rock bolts parts, thereby reducing corrosion.

[004] The adhesive generally comprises a two-part resin inserted into the hole. The resin may be provided in a tube form with the two parts separated. The rock bolt ruptures the tube and the rock bolt is then rotated to mix the two parts of the resin to allow it to set. This process of mixing the resin can be quite time- consuming, thereby increasing the costs associated with installation of a number of rock bolts.

[005] The present invention relates to a resin cartridge for use with a rock bolt aimed at allowing quicker mixing of the two-part resin. Summary of the Invention

[006] According to one aspect of the present invention there is provided a resin cartridge comprising: an inner tube having a central bore through which a shaft of a rock bolt may be received; an outer tube into which the inner tube is received; and a two-part resin provided in an annular space between the inner tube and the outer tube; wherein an outer surface of the inner tube includes a plurality of outer protrusions such that rotating the shaft of the rock bolt causes rotation of the inner tube and thereby mixing of the resin by the outer protrusions.

[007] Preferably the outer protrusions comprise a plurality of longitudinal first ribs extending along the outer surface of the inner tube.

[008] Preferably the first ribs are located at intervals along the length of the outer surface of the inner tube such that a plurality of first gaps are defined between each adjacent pair of first ribs.

[009] Preferably the inner surface of the outer tube is provided with a plurality of inner protrusions.

[010] In a preferred embodiment, the inner protrusions comprise a plurality of longitudinal second ribs extending along the inner surface of the outer tube at intervals to define a plurality of second gaps such that relative rotation of the inner tube and the outer tube causes the first ribs to rotate through the second gaps.

[011] Preferably the outer tube is provided with a plurality of openings.

[012] In a preferred embodiment, the openings are provided at intervals along the length of the outer tube and spaced around the periphery of the outer tube.

[013] Preferably the two-part resin is enclosed by a breakable membrane to be received around the outer surface of the inner tube within the annular space defined between the inner and outer tubes. [014] In a preferred embodiment, the resin cartridge comprises an annular package.

[015] Preferably the inner tube includes projections extending outwardly from around the periphery of the outer surface of the inner tube adjacent ends of the inner tube to be received in complementary shaped grooves in the inner surface of the outer tube to restrict relative longitudinal movement of the inner tube and the outer tube.

[016] Preferably the second ribs are provided on an insert comprising an elongate member receivable by sliding into a channel on an inner surface of the outer tube.

Brief Description of the Drawings

[017] The invention will now be described, by way of example, with reference to the following drawings, in which:

[018] Figure 1 is an upper perspective view of a resin cartridge in accordance with the present invention;

[019] Figure 2 is an upper perspective view of the outer tube of the resin cartridge of Figure 1;

[020] Figure 3a is a front view of the outer tube of Figure 2;

[021] Figure 3b is a top view of the outer tube of Figure 2;

[022] Figure 3c is an end view of the outer tube of Figure 2;

[023] Figure 3d is a close up view of Detail A of Figure 2;

[024] Figure 4 is an upper perspective view of an inner tube of the resin cartridge of Figure 1;

[025] Figure 5a is a top view of the inner tube of Figure 4;

[026] Figure 5b is a cross sectional view of the inner tube of Figure 5a through the line A-A;

[027] Figure 6a is a perspective view of an insert of the outer tube of the resin cartridge;

[028] Figure 6b is a front view of the insert of Figure 6a;

[029] Figure 6c is an end view of the insert of Figure 6a; [030] Figure 7 is view of a resin cartridge received within a rock bolt comprising a central shaft and an outer sleeve;

[031] Figure 8 is a view of the resin cartridge and the rock bolt of Figure 7 with the sleeve of the rock bolt removed for clarity; and

[032] Figure 9 is a view of a resin package for use with the resin cartridge.

Detailed Description of Preferred Embodiments

[033] Referring to the Figures, there is shown a resin cartridge 10 comprising an inner tube 12 and an outer tube 14. The inner tube 12 and the outer tube 14 are of approximately the same length such that, in use, when the inner tube 12 is received within the outer tube 14, the inner tube 12 extends generally along the length of the interior of the outer tube 14. An annular space is thereby defined between the inner tube 12 and the outer tube 14.

[034] The resin cartridge 10 is provided for use with a rock bolt 11 having a shaft 13. In the embodiment shown, the rock bolt 11 comprises the shaft 13 and an elongate sleeve 15 into which the shaft 13 is received, as can be seen in Figure 7. The rock bolt 11 is received within a drilled hole within a rock face such that the rock bolt 11 may be mechanically fastened to the interior of the hole and the resin cartridge 10 is to be located in use between the shaft 13 and the sleeve 15 of the rock bolt 11.

[035] The inner tube 12 comprises an elongate tubular member having a generally circular cross-section. The inner tube 12 includes a central bore 16 extending from a first end to a second end thereof. The central bore 16 is provided to receive the shaft 13 of the rock bolt 11.

[036] The inner tube 12 and the outer tube 14 may be formed of any suitable material. For example, the inner tube 12 and the outer tube 14 may be formed from aluminium.

[037] The outer surface of the inner tube 12 is provided with engagement members adjacent each end of the inner tube 12. The engagement members are provided to engage with complementary engagement members on inner surfaces of the outer tube 14 such that longitudinal sliding of the outer tube 14 relative to the inner tube 12 is restricted once the inner tube 12 is received within the outer tube 14. The engagement members on the outer surface of the inner tube 12 in the embodiment shown comprise annular projections 18 extending outwardly from around the periphery of the outer surface of the inner tube 12. The annular projections 18 in the embodiment shown taper inwardly towards the ends of the inner tube 12. Inner surfaces of the outer tube 14 include complementary shaped grooves to receive the annular projections 18.

[038] The inner tube 12 is engaged in use with the shaft 13 such that rotation of the shaft 13 causes rotation of the inner tube 12. In the embodiment shown, the first and second ends of the inner tube 12 each include one or more apertures 20. The apertures 20 are provided for receiving clips (not shown). The clips are received within the apertures 20 such that the clips engage with the outer surface of the shaft 13 and thereby fix the inner tube 12 to the shaft 13.

[039] The outer surface of the inner tube 12 is provided with one or more outer protrusions 22 extending outwardly therefrom. The outer protrusions 22 are provided along the length of the inner tube 12 from the first end to the second end thereof. In the embodiment shown, the outer protrusions 22 comprise a plurality of first ribs 24 extending longitudinally along the outer surface of the inner tube 12. The first ribs 24 are located at intervals along the length of the outer surface of the inner tube 12 such that a plurality of first gaps 26 are defined between each adjacent pair of first ribs 24.

[040] The inner surface of the outer tube 14 is provided with a plurality of inner protrusions 32. The inner protrusions 32 are provided along the length of the inner surface of the outer tube 14 from the first end to the second end. In the embodiment shown, the inner protrusions 32 comprise a plurality of second ribs 34 extending longitudinally along the inner surface of the outer tube 14. The second ribs 34 are located at intervals along the length of the inner surface of the outer tube 14 such that a plurality of second gaps 36 are defined between each adjacent pair of second ribs 34. [041] The outer tube 14 is provided also with a plurality of openings 44. The openings 44 extend through the outer tube 14 into the annular space between the inner tube 12 and the outer tube 14. The openings 44 are provided at intervals along the length of the outer tube 14 and spaced also around the periphery of the outer tube 14.

[042] The inner tube 12 and the outer tube 14 are located in use such that each of the first ribs 24 is located adjacent one of the second gaps 36 and each of the second ribs 34 is located adjacent one of the first gaps 26. Therefore, relative rotation of the inner tube 12 and the outer tube 14 causes the first ribs 24 to rotate through the second gaps 36 and the second ribs 34 to rotate through the first gaps 26.

[043] In the embodiment shown, the second ribs 34 are provided on an insert comprising an elongate member 38. The inner surface of the outer tube 14 is provided with a channel 40 therein extending from the first end to the second end. The elongate member 38 includes a base portion 42 (as shown in Figure 6c) which is received by sliding into the channel 40. The second ribs 34 extend outwardly from the base portion 42.

[044] The resin cartridge 10 is provided also with a two-part resin. The resin is to be received within the annular space between the inner tube 12 and the outer tube 14. The two-part resin is provided in a resin package 50 comprising a breakable membrane. The resin package 50 is provided in an annular shape or is formable into an annular shape, as can be seen for example in Figure 9. The two parts of the resin are separated within the resin package 50 which is received around the outer surface of the inner tube 12 within the annular space. The resin package 50 may be received around the inner tube 12 prior to insertion of the elongate member 38 into the channel 40.

[045] In use, the resin cartridge 10 is received within the annular space between the inner tube 12 and the outer tube 14. A plurality of resin cartridges 10 may be used along the length of the rock bolt 11 around the shaft 13. The resin may be mixed by rotation of the shaft 13 which will rotate the inner tube 12 relative to the outer tube 14. The outer protrusions 22 and the inner protrusions 32 rotate relative to each other and break the resin package. Relative rotation of the protrusions 22 and 32 provide effective mixing of the two parts of the resin. The resin will therefore be mixed relatively quickly by rotation of the shaft 13 of the rock bolt 11. Mixed resin may move outwardly through the openings 44 in the outer tube 14 to come into contact with the sleeve 15 of the rock bolt 11.

[046] It will be readily apparent to persons skilled in the relevant arts that various modifications and improvements may be made to the foregoing embodiments, in addition to those already described, without departing from the basic inventive concepts of the present invention.

Claims

1. A resin cartridge comprising: an inner tube having a central bore through which a shaft of a rock bolt may be received; an outer tube into which the inner tube is received; and a two-part resin provided in an annular space between the inner tube and the outer tube; wherein an outer surface of the inner tube includes a plurality of outer protrusions such that rotating the shaft of the rock bolt causes rotation of the inner tube and thereby mixing of the resin by the outer protrusions.

2. A resin cartridge in accordance with claim 1, wherein the outer protrusions comprise a plurality of longitudinal first ribs extending along the outer surface of the inner tube.

3. A resin cartridge in accordance with claim 2, wherein the first ribs are located at intervals along the length of the outer surface of the inner tube such that a plurality of first gaps are defined between each adjacent pair of first ribs.

4. A resin cartridge in accordance with claim 3, wherein the inner surface of the outer tube is provided with a plurality of inner protrusions.

5. A resin cartridge in accordance with claim 4, wherein the inner protrusions comprise a plurality of longitudinal second ribs extending along the inner surface of the outer tube at intervals to define a plurality of second gaps such that relative rotation of the inner tube and the outer tube causes the first ribs to rotate through the second gaps.

6. A resin cartridge in accordance with any one of the preceding claims, wherein the outer tube is provided with a plurality of openings.

7. A resin cartridge in accordance with claim 6, wherein the openings are provided at intervals along the length of the outer tube and spaced around the periphery of the outer tube.

8. A resin cartridge in accordance with any one of the preceding claims, wherein the two-part resin is enclosed by a breakable membrane to be received around the outer surface of the inner tube within the annular space defined between the inner and outer tubes.

9. A resin cartridge in accordance with claim 8, wherein the resin cartridge comprises an annular package.

10. A resin cartridge in accordance with any one of the preceding claims, wherein the inner tube includes projections extending outwardly from around the periphery of the outer surface of the inner tube adjacent ends of the inner tube to be received in complementary shaped grooves in the inner surface of the outer tube to restrict relative longitudinal movement of the inner tube and the outer tube.

11. A resin cartridge in accordance with any one of claims 5 to 10, wherein the second ribs are provided on an insert comprising an elongate member receivable by sliding into a channel on an inner surface of the outer tube.