SPRING-BASED SUPPORT DEVICE FOR ANCHORING AND/OR CENTRALIZING A BOLT OR PIPE IN A BOREHOLE

Description

This application claims priority to Canadian Application No. 3,218,701 entitled Spring-Based Support Device for Anchoring and/or Centralizing a Bolt or Pipe in a Borehole, filed on Nov. 16, 2023, the entire contents of which are hereby incorporated by reference.

FIELD

The present disclosure relates to devices for anchoring and/or centralizing a bolt or pipe in a borehole, and more particularly to a spring-based support device for anchoring and/or centralizing a bolt or pipe in a borehole.

BACKGROUND

Rock bolts, also referred to as rock anchors, are widely used, for example, in underground mining and tunneling for rock reinforcement purposes and, in particular, for stabilizing the roof and/or the walls of a gallery or tunnel. To this end, boreholes, usually between two and twelve meters long, are driven into a rock face. Rock bolts of corresponding length are then inserted into the boreholes and, depending on the type of the rock bolt, are fastened in the borehole by deposing grout or synthetic resin adhesives into the annulus between the bolt and the borehole, or mechanically by using clamping or bracing.

Furthermore, in the oil and gas exploration and production industry, subsurface hydro-carbon bearing rock formations are accessed by boreholes drilled from the surface. The drilled boreholes are lined with tubular members, conventionally metal tubing known as casing or liner. The casing is typically cemented in the borehole by deposing a cement slurry into the annulus between the casing and borehole.

A major issue in rock bolting, as well as in cementing an oil or gas well casing, is that the rock bolt or the casing are very rarely inserted in complete co-axial alignment with the borehole, thus causing eccentricity of the bolt or casing to the borehole, resulting in an irregular annular space between the bolt or casing and the borehole with a thin and a thick annular arc. In the thin annular arc there is insufficient resin, grout, or cement to provide sufficient mechanical interlock between the bolt or casing and the borehole, while the space in the thick annular arc might not be sufficiently filled to provide sufficient mechanical interlock between the bolt or casing and the borehole. Furthermore, when long rock bolts are inserted into substantially horizontal oriented boreholes, a middle section thereof will sag due to its weight resulting in a substantial eccentricity of the middle section of the bolt to the borehole even when the ends of the bolt are in co-axial alignment with the borehole.

Unfortunately, existing devices for centralizing bolts or casings in respective boreholes are complex, difficult and cost-extensive to manufacture, and/or substantially obstruct the annular space between the bolt or casing and the borehole, thus impeding the flow of the resin, grout, or cement slurry.

A further issue arises when a rock bolt needs to be inserted into a borehole that is oriented upwardly or has an upwardly oriented inclination, for example, for stabilizing the roof of a gallery or tunnel. Unfortunately, existing devices do not retain the bolts in the borehole while they are inserted into the borehole, for example, to allow subsequent sections of the bolt to be threaded together.

It may be desirable to provide a support device for centralizing a bolt or pipe in a borehole that is simple and cost-effective to manufacture.

It also may be desirable to provide a support device for centralizing a bolt or pipe in a borehole that does not obstruct the annular space between the bolt or casing and the borehole.

It also may be desirable to provide a support device for centralizing a bolt or pipe in a borehole that is easily mounted to subsequent sections of the bolt or pipe.

It also may be desirable to provide a support device that retains a bolt or pipe in an upwardly oriented or upwardly inclined borehole during insertion of the bolt or pipe into the borehole.

It also may be desirable to provide a support device that retains a bolt or pipe in an upwardly oriented or upwardly inclined borehole during insertion of the bolt or pipe into the borehole and is easily mounted to subsequent sections of the bolt or pipe.

SUMMARY

Accordingly, in one embodiment the disclosed system provides a support device for centralizing a bolt or pipe in a borehole that is simple and cost-effective to manufacture.

In one embodiment the disclosed system provides a support device for centralizing a bolt or pipe in a borehole that does not obstruct the annular space between the bolt or casing and the borehole.

In one embodiment the disclosed system provides a support device for centralizing a bolt or pipe in a borehole that is easily mounted to subsequent sections of the bolt or pipe.

In one embodiment the disclosed system provides a support device that retains a bolt or pipe in an upwardly oriented or upwardly inclined borehole during insertion of the bolt or pipe into the borehole.

According to one aspect, there is provided a device for supporting a bolt or pipe in a borehole. A mounting portion is adapted for being placed at a predetermined location between a first end and a second end of the bolt or pipe. The mounting portion forms at least a coil of a helical spring adapted for surrounding a respective section of the bolt or pipe. A first interacting portion extends from a first end of the mounting portion. The first interacting portion is adapted for interacting with a wall of the borehole for centralizing the bolt or pipe within the borehole.

According to the aspect, there is provided a device for supporting a bolt or pipe in a borehole. A mounting portion is adapted for being placed at a predetermined location between a first end and a second end of the bolt or pipe. The mounting portion forms at least a coil of a helical spring adapted for surrounding a respective section of the bolt or pipe. A first interacting portion extends from a first end of the mounting portion. The first interacting portion is adapted for interacting with a wall of the borehole for centralizing the bolt or pipe within the borehole. A second interacting portion extends from a second end of the mounting portion. The second interacting portion is adapted for interacting with the wall of the borehole for centralizing the bolt or pipe within the borehole. The first interacting portion and the second interacting portion each extend outwardly in a direction perpendicular to a longitudinal axis of the mounting portion. The first interacting portion and the second interacting portion each extend along a substantially straight line. An end of each of the first interacting portion and the second interacting portion is adapted to interact with the wall of the borehole for centralizing the bolt or pipe within the borehole.

According to the aspect, there is provided a device for supporting a bolt or pipe in a borehole. A mounting portion is adapted for being placed at a predetermined location between a first end and a second end of the bolt or pipe. The mounting portion forms at least a coil of a helical spring adapted for surrounding a respective section of the bolt or pipe. A first interacting portion extends from a first end of the mounting portion. The first interacting portion is adapted for interacting with a wall of the borehole for centralizing the bolt or pipe within the borehole. A second interacting portion extends from a second end of the mounting portion. The second interacting portion is adapted for interacting with the wall of the borehole for centralizing the bolt or pipe within the borehole. The first interacting portion and the second interacting portion each first extend outwardly in a direction perpendicular to a longitudinal axis of the mounting portion and then inwardly in the direction perpendicular to a longitudinal axis of the mounting portion. An apex of each of the first interacting portion and the second interacting portion is adapted to interact with the wall of the borehole for centralizing the bolt or pipe within the borehole. The first interacting portion and the second interacting portion each first extend along a substantially straight line followed by a curved portion.

According to the aspect, there is provided a device for supporting a bolt or pipe in a borehole. A mounting portion is adapted for being placed at a predetermined location between a first end and a second end of the bolt or pipe. The mounting portion forms at least a coil of a helical spring adapted for surrounding a respective section of the bolt or pipe. A first interacting portion extends from a first end of the mounting portion. The first interacting portion is adapted for interacting with a wall of the borehole for centralizing the bolt or pipe within the borehole. A second interacting portion extends from a second end of the mounting portion. The second interacting portion is adapted for interacting with the wall of the borehole for centralizing the bolt or pipe within the borehole. The first interacting portion and the second interacting portion each first extend outwardly in a direction perpendicular to a longitudinal axis of the mounting portion and then inwardly in the direction perpendicular to a longitudinal axis of the mounting portion. An apex of each of the first interacting portion and the second interacting portion is adapted to interact with the wall of the borehole for centralizing the bolt or pipe within the borehole. An end of each of the first interacting portion and the second interacting portion is disposed at approximately a same distance to the longitudinal axis as the mounting portion.

According to the aspect, there is provided a method for supporting a bolt or pipe in a borehole. A plurality of support devices is provided. Each support device comprises a mounting portion adapted for being placed at a predetermined location between a first end and a second end of the bolt or pipe. The mounting portion forms at least a coil of a helical spring adapted for surrounding a respective section of the bolt or pipe. Interacting means are adapted for interacting with a wall of the borehole for centralizing the bolt or pipe within the borehole. The interacting means extend from the mounting portion. A first support device is placed at a predetermined location between a first end and a second end of a first section of the bolt or pipe. The first section of the bolt or pipe is disposed in the borehole. A second support device is placed at a predetermined location between a first end and a second end of a second section of the bolt or pipe. The second section of the bolt or pipe is connected to the first section of the bolt or pipe and disposed in the borehole.

According to the aspect, there is provided a method for supporting a bolt or pipe in a borehole. A plurality of support devices is provided. Each support device comprises a mounting portion adapted for being placed at a predetermined location between a first end and a second end of the bolt or pipe. The mounting portion forms at least a coil of a helical spring adapted for surrounding a respective section of the bolt or pipe. Interacting means are adapted for interacting with a wall of the borehole for centralizing the bolt or pipe within the borehole. The interacting means extend from the mounting portion. A first support device is placed at a predetermined location between a first end and a second end of a first section of the bolt or pipe. The first section of the bolt or pipe is disposed in the borehole. The interacting means are adapted for interacting with a wall of the borehole for retaining the first section of the bolt within the borehole with the first section of the bolt being disposed in the borehole in an upward direction.

An advantage of the present disclosure is that it provides a support device for centralizing a bolt or pipe in a borehole that is simple and cost-effective to manufacture.

A further advantage is that it provides a support device for centralizing a bolt or pipe in a borehole that does not obstruct the annular space between the bolt or casing and the borehole.

A further advantage is that it provides a support device for centralizing a bolt or pipe in a borehole that is easily mounted to subsequent sections of the bolt or pipe.

A further advantage is that it provides a support device that retains a bolt or pipe in an upwardly oriented or upwardly inclined borehole during insertion of the bolt or pipe into the borehole.

A further advantage is that it provides a support device that retains a bolt or pipe in an upwardly oriented or upwardly inclined borehole during insertion of the bolt or pipe into the borehole and is easily mounted to subsequent sections of the bolt or pipe.

BRIEF DESCRIPTION OF THE DRAWINGS

An embodiment of the present disclosure is described below with reference to the accompanying drawings, in which:

FIG. 1 is a simplified block diagram illustrating in a perspective top view a device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 2 is a simplified block diagram illustrating in a side view a device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 3 is a simplified block diagram illustrating in a bottom view a device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 4 is a simplified block diagram illustrating in a first side view dimensions of an example implementation of the device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 5 is a simplified block diagram illustrating in a second side view dimensions of an example implementation of the device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 6 is a simplified block diagram illustrating in bottom view dimensions of an example implementation of the device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 7 is a simplified block diagram illustrating in a side view placement of a bolt in a borehole using the device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 8 is a simplified block diagram illustrating in a side view a variant of the device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 9 is a simplified block diagram illustrating in a first side view dimensions of an example implementation of the variant of the device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 10 is a simplified block diagram illustrating in a second side view dimensions of an example implementation of the variant of the device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 11 is a simplified block diagram illustrating in top view dimensions of an example implementation of the variant of the device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 12 is a simplified block diagram illustrating in a side view placement of a bolt in a borehole using the device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 13 is a simplified block diagram illustrating in a side view a modification of the device for supporting a bolt or pipe in a borehole according to a first embodiment;

FIG. 14 is a simplified block diagram illustrating in a side view a device for supporting a bolt or pipe in a borehole according to a second embodiment;

FIG. 15 is a simplified block diagram illustrating in a perspective top view a device for supporting a bolt or pipe in a borehole according to a second embodiment;

FIG. 16 is a simplified block diagram illustrating in a side view a device for supporting a bolt or pipe in a borehole according to a third embodiment;

FIG. 17 is a simplified block diagram illustrating in side view a device for supporting a bolt or pipe in a borehole according to a fourth embodiment;

FIG. 18 is a simplified block diagram illustrating in side view a device for supporting a bolt or pipe in a borehole according to a fourth embodiment; and,

FIG. 19 is a simplified block diagram illustrating in a side view a different method of supporting the device for supporting a bolt or pipe in a borehole according to an embodiment.

DETAILED DESCRIPTION

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, certain methods and materials are now described.

The present disclosure relates to a device for centralizing ground support bolts, also called anchors, rods, bars or shafts, in the mining, tunnelling, and civil construction fields. For definition, “bolt” will be used for the remainder of this document to represent all of these items.

While the description of certain embodiments hereinbelow is with reference to a device for centralizing ground support bolts, it will become evident to those skilled in the art that the embodiments of the disclosure are not limited thereto, but are also adaptable for centralizing pipes in boreholes, for example, casing pipes used in the oil and gas exploration and production industry.

Referring to FIGS. 1 to 12 a device 100 for supporting a bolt or pipe in a borehole according to an embodiment is provided. The support device 100 comprises a mounting portion 102A adapted for being placed at a predetermined location between a first end and a second end of the bolt or pipe, as will be described hereinbelow. The mounting portion 102A forms one or more coils, in one case, three coils 102A.1, 102A.2, and 102A.3, of a helical spring adapted for surrounding a respective section of the bolt, as illustrated in FIGS. 1 and 2. It is noted that the mounting portion 102A of support device 100 is not limited to three coils, but the number of coils may be varied depending on design preferences.

The coils 102A.1, 102A.2, and 102A.3 can be spaced such that adjacent coils are spaced having a predetermined distance DC therebetween, as illustrated in FIG. 2, which corresponds to a distance between successive screw threads 16 of the bolt 14, thus enabling the mounting portion 102A to be threaded onto the screw thread 16 disposed on the bolt 14, as illustrated in FIG. 7.

First interacting portion 102B.1 extends from a first end 102AE.1 of the mounting portion 102A while second interacting portion 102B.2 extends from a second end 102AE.2 of the mounting portion 102A, as illustrated in FIGS. 1 and 2. The first interacting portion 102B.1 and the second interacting portion 102B.2 each extend outwardly in a direction perpendicular to a longitudinal axis 101 of the mounting portion 102A.

The first interacting portion 102B.1 and the second interacting portion 102B.2 each can be first curved and then extend along a substantially straight line such that an end 102C.1 of the first interacting portion 102B.1 and an end 102C.2 of the second interacting portion 102B.2 are disposed on opposite sides of the longitudinal axis 101 at an approximately same distance thereto, as illustrated in FIGS. 2 and 3. This placement of the ends 102C.1 and 102C.2 ensures centralization of the bolt 14 within the borehole 12 when the ends 102C.1 and 102C.2 interact with the inside wall 13 of the borehole 12 such that the bolt or pipe 14 is substantially co-axial with the borehole 12, as illustrated in FIG. 7, while the orientation of the straight section of the first interacting portion 102B.1 and the second interacting portion 102B.2 each ensures that the bolt 14 is retained within the borehole, thus enabling the bolt 14 to be pushed into the borehole 12 as indicated by the block arrow in FIG. 7, while preventing the bolt 14 from being pulled out of the borehole 12, thus substantially facilitating deployment of the bolts 14 in upwardly oriented or upwardly inclined boreholes 12 for reinforcing rock strata above a ceiling of a gallery or tunnel.

A bottom section 102B.3 of the second interacting portion 102B.2 can be bent outwardly, as illustrated in FIG. 8. By bending the bottom section 102B.3 of the second interacting portion 102B.2 outwardly, the angle between the same and the inside wall 13 of the borehole 12 is increased, resulting in an increased grip between the end 102C.2 and the inside wall 13. Optionally, also a bottom section of the first interacting portion 102B.1 may be bent outwardly.

It is noted that instead of by placing the ends 102C.1 and 102C.2 on opposite sides of the longitudinal axis 101, centralization of the bolt 14 within the borehole 12 can also be achieved by applying different tension on each interacting portion 102B.1, 102B.2 due to the interacting portions 102B.1, 102B.2 having starting points at opposite ends 102AE.1, 102AE.2 of the mounting portion 102A. However, in this case the design of the interacting portions and the respective tensions has to be adjusted for each borehole-bolt combination.

In an example implementation, the support device 100 was produced using Class II, oil tempered 0.188″ diameter spring wire (ASTM A229) having the dimensions, in inches, as illustrated in FIGS. 4 to 6 and 9 to 11. To produce the support device 100 a spring winder was used to produce the mounting portion 102A and looper tables for forming the first interacting portion 102B.1 and the second interacting portion 102B.2. Alternatively, a CNC coiler may be employed for the complete bending process. After bending, the entire wireform, forming the support device 100, is stress relieved using heat treatment in a pyrometric oven. Optionally, the wireforms may be coated in an additional processing step.

Alternatively, other materials such as, for example, music wires, stainless steel wires, Class I spring wires, or Chrome Silicon spring wires may be used.

Depending on the application and design preferences, the support device 100 can be manufactured in a wide range of diameters and lengths such as, for example, but not limited thereto:

- spring wire diameter between 0.100″ and 0.750″;
- inside diameter of the mounting portion 102A between 0.975″ and 4″;
- length of the mounting portion 102A between 1″ and 5″; and,
- length of the interacting portions 102B.1 and 102B.2 between 0.50″ and 25″.

Furthermore, the angles may also be varied in wide ranges.

The support device 100 substantially facilitates placement of a bolt 14 in a borehole 12 such that the bolt 14 is centralized and, in particular in cases where the borehole is upwardly oriented or upwardly inclined by retaining the bolt 14 within the borehole 12 during placement of the same therein. For example, a first support device 100, or a plurality of support devices 100, is placed at a predetermined location between a first end 14A and a second end 14B of a first section 14.1 of the bolt 14, as illustrated in FIG. 12. After the support device, or support devices, is placed, the first section 14.1 of the bolt 14 is disposed in the borehole 12 and retained therein in case the borehole 12 is oriented upwardly or inclined upwardly for reinforcing rock strata 10 above a ceiling 11 of a gallery or tunnel.

While the first section 14.1 of the bolt 14 is safely retained in the borehole 12, a second support device 100, or a plurality of support devices 100, is placed at a predetermined location between a first end 14A and a second end 14B of a second section 14.2 of the bolt 14. The first end 14A of the second section 14.2 of the bolt 14 is then connected to the second end 14B of the first section 14.1 of the bolt 14 using, for example, a screw type connection. The second section 14.2 of the bolt 14 is then disposed in the borehole 12 and retained therein. This process may be repeated numerous times depending on the length of the borehole 12 and the length of the bolt sections.

In some instances it may be desirable to enable removal of the bolt 14 from the borehole 12. In this case, the support device 100 may be adapted for only centralizing the bolt 14 by adding to each of the first interacting portion 102B.1 and the second interacting portion 102B.2 a section 102D.1, 102D.2 curved inwardly in the direction perpendicular to a longitudinal axis 101 of the mounting portion 102A, as illustrated in FIG. 13. Here, the apex 102E.1, 102E.2 of each of the first interacting portion 102B.1 and the second interacting portion 102B.2 is adapted to interact with the wall 13 of the borehole 12 for centralizing the bolt 14 within the borehole 12.

Referring to FIGS. 14 and 15 a support device 200 for supporting a bolt or pipe in a borehole according to a second embodiment is provided. Here, the first interacting portion 202B. 1 and the second interacting portion 202B.2 each first extend outwardly in a direction perpendicular to a longitudinal axis 201 of the mounting portion 202A and then inwardly in the direction perpendicular to a longitudinal axis 201 of the mounting portion 202A. An end 202C.1, 202C.2 of each of the first interacting portion 202B.1 and the second interacting portion 202B.2 is disposed at approximately a same distance to the longitudinal axis 201 as the mounting portion 202A. The apex 202D.1, 202D.2 of each of the first interacting portion 202B. 1 and the second interacting portion 202B.2 is adapted to interact with the wall 13 of the borehole 12 for centralizing the bolt 14 within the borehole 12. The apex 202D.1 of the first interacting portion 202B.1 and apex 202D.2 of the second interacting portion 202B.2 can be disposed on opposite sides of the longitudinal axis 201 at an approximately same distance thereto.

Referring to FIG. 16 a support device 300 for supporting a bolt or pipe in a borehole according to a third embodiment is provided. Again, the first interacting portion 302B.1 and the second interacting portion 302B.2 each first extend outwardly in a direction perpendicular to a longitudinal axis 301 of the mounting portion 302A and then inwardly in the direction perpendicular to a longitudinal axis 301 of the mounting portion 302A. An end 302E.1, 302E.2 of each of the first interacting portion 302B.1 and the second interacting portion 302B.2 is disposed at approximately a same distance to the longitudinal axis 301 as the mounting portion 302A. The apex 302C.1, 302C.2 of each of the first interacting portion 302B. 1 and the second interacting portion 302B.2 is adapted to interact with the wall 13 of the borehole 12 for centralizing the bolt 14 within the borehole 12. The apex 302C.1 of the first interacting portion 302B.1 and apex 302C.2 of the second interacting portion 302B.2 can be disposed on opposite sides of the longitudinal axis 301 at an approximately same distance thereto. Here, a section 302D.1, 302D.2 of each of the first interacting portion 302B.1 and the second interacting portion 302B.2 has a concave curvature compared to the convex curvature of the remainder of the first interacting portion 302B.1 and the second interacting portion 302B.2.

Referring to FIGS. 17 and 18 a support device 400 for supporting a bolt or pipe in a borehole according to a fourth embodiment is provided. Here, the first interacting portion 402B forms a spiral with a diameter increasing from a diameter D1 being approximately equal to a diameter of the mounting portion 402A to a diameter D2 being approximately equal to a diameter of the borehole 12. The end portion 402C of the first interacting portion 402B is adapted to interact with the wall 13 of the borehole 12 for centralizing the bolt 14 within the borehole 12. Optionally, the end 402D of the first interacting portion 402B is adapted to interact with the wall 13 of the borehole 12 for retaining the bolt 14 within the borehole 12.

In applications where there is no thread for interacting with the coils of the mounting portion of the support devices described hereinabove such as, for example, when used for centralizing casing pipes, a collar 22 provided to connect sections 20.1 and 20.2 of the casing pipe may be used for abutting the support device, as illustrated in FIG. 19 for the support device 100. It is noted that the same applies to all support devices described hereinabove.

The support device described hereinabove are simple and cost-effective to manufacture. Furthermore, the wire structure of the support devices does not obstruct the annular space between the bolt 14 or casing pipe and the borehole 12 thus enabling substantially unimpeded flow of resin, grout, or cement slurry between the bolt 14 or casing pipe and the borehole 12 at locations where the support devices are placed.

The present invention has been described herein with regard to certain embodiments. However, it will be obvious to persons skilled in the art that a number of variations and modifications can be made without departing from the scope of the invention as described herein.

Claims

1. A device for supporting a bolt or pipe in a borehole comprising: a mounting portion adapted for being placed at a predetermined location between a first end and a second end of the bolt or pipe, the mounting portion forming at least a coil of a helical spring adapted for surrounding a respective section of the bolt or pipe; and,a first interacting portion extending from a first end of the mounting portion, the first interacting portion being adapted for interacting with a wall of the borehole for centralizing the bolt or pipe within the borehole.
2. The device according to claim 1 further comprising a second interacting portion extending from a second end of the mounting portion, the second interacting portion being adapted for interacting with the wall of the borehole for centralizing the bolt or pipe within the borehole.
3. The device according to claim 2 wherein the first interacting portion and the second interacting portion each extend outwardly in a direction perpendicular to a longitudinal axis of the mounting portion.
4. The device according to claim 3 wherein the first interacting portion and the second interacting portion each extend along a substantially straight line and wherein an end of each of the first interacting portion and the second interacting portion is adapted to interact with the wall of the borehole for centralizing the bolt or pipe within the borehole.
5. The device according to claim 3 wherein the first interacting portion and the second interacting portion each extend along a substantially straight line and wherein an end of each of the first interacting portion and the second interacting portion is adapted to interact with the wall of the borehole for centralizing the bolt within the borehole and for retaining the bolt within the borehole.
6. The device according to claim 2 wherein the first interacting portion and the second interacting portion each first extend outwardly in a direction perpendicular to a longitudinal axis of the mounting portion and then inwardly in the direction perpendicular to a longitudinal axis of the mounting portion and wherein an apex of each of the first interacting portion and the second interacting portion is adapted to interact with the wall of the borehole for centralizing the bolt or pipe within the borehole.
7. The device according to claim 6 wherein the first interacting portion and the second interacting portion each first extend along a substantially straight line followed by a curved portion.
8. The device according to claim 6 wherein an end of each of the first interacting portion and the second interacting portion is disposed at approximately a same distance to the longitudinal axis as the mounting portion.
9. The device according to claim 4 wherein the end of the first interacting portion and end of the second interacting portion are disposed on opposite sides of the longitudinal axis.
10. The device according to claim 6 wherein the apex of the first interacting portion and apex of the second interacting portion are disposed on opposite sides of the longitudinal axis.
11. The device according to claim 1 wherein the mounting portion is adapted for being threaded onto a screw thread disposed on the bolt or pipe.
12. The device according to claim 11 wherein the mounting portion comprises a plurality of coils and wherein adjacent coils are spaced having a predetermined distance therebetween.
13. The device according to claim 12 wherein the predetermined distance between adjacent coils corresponds to a distance between successive screw threads of the bolt or pipe.
14. The device according to claim 1 wherein the first interacting portion forms a spiral with a diameter increasing from a diameter being approximately equal to a diameter of the mounting portion to a diameter being approximately equal to a diameter of the borehole.
15. The device according to claim 14 wherein an end portion of the first interacting portion is adapted to interact with the wall of the borehole for centralizing the bolt or pipe within the borehole.
16. The device according to claim 14 wherein an end portion of the first interacting portion is adapted to interact with the wall of the borehole for centralizing the bolt within the borehole and for retaining the bolt within the borehole.
17. A method for supporting a bolt or pipe in a borehole comprising: providing a plurality of support devices, each support device comprising: a mounting portion adapted for being placed at a predetermined location between a first end and a second end of the bolt or pipe, the mounting portion forming at least a coil of a helical spring adapted for surrounding a respective section of the bolt or pipe; and,interacting means adapted for interacting with a wall of the borehole for centralizing the bolt or pipe within the borehole, the interacting means extending from the mounting portion;placing a first support device at a predetermined location between a first end and a second end of a first section of the bolt or pipe; and,disposing the first section of the bolt or pipe in the borehole.
18. The method according to claim 17 further comprising: placing a second support device at a predetermined location between a first end and a second end of a second section of the bolt or pipe;connecting the second section of the bolt or pipe to the first section of the bolt or pipe; and,disposing the second section of the bolt or pipe in the borehole.
19. The method according to claim 17 further comprising placing a second support device at a predetermined location between the first end and the second end of the first section of the bolt or pipe.
20. The method according to claim 17 wherein the interacting means are adapted for interacting with a wall of the borehole for retaining the bolt within the borehole and wherein the first section of the bolt is disposed in the borehole in an upward or upwardly inclined direction.

Priority Claims (1)

Number	Date	Country	Kind
3218701	Nov 2023	CA	national

SPRING-BASED SUPPORT DEVICE FOR ANCHORING AND/OR CENTRALIZING A BOLT OR PIPE IN A BOREHOLE

Information

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Priority Claims (1)