CA2212993A1 - Method and apparatus for fracturing rock or similar material - Google Patents
Method and apparatus for fracturing rock or similar materialInfo
- Publication number
- CA2212993A1 CA2212993A1 CA 2212993 CA2212993A CA2212993A1 CA 2212993 A1 CA2212993 A1 CA 2212993A1 CA 2212993 CA2212993 CA 2212993 CA 2212993 A CA2212993 A CA 2212993A CA 2212993 A1 CA2212993 A1 CA 2212993A1
- Authority
- CA
- Canada
- Prior art keywords
- hole
- aggregate
- impact
- impacting
- rock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/04—Other methods or devices for dislodging with or without loading by devices with parts pressed mechanically against the wall of a borehole or a slit
Abstract
A method and apparatus for fracturing rock and similar material having a pre-drilled hole in the material to be fractured. The method includes filling the hole with an aggregate of friable material and impacting the aggregate with a force sufficient to crush a portion of the aggregate proximate a point of impact into crushed material. The crushed material transfers the force of the impact to the sides of the hole so as to fracture material surrounding the hole.
Description
METHOD AND APPARATUS FOR FRACTURING ROCK
OR SIMILAR MATRRTl~T~
FIELD
The present invention relates to a method and apparatus for fracturing rock or other similar material in a way so as to achieve removal of such material.
BACKGROUND
Conventional techniques for breaking rock include drilling into rock and setting explosive charges to blast away rock sections. Another known technique involves drilling a hole in the shape of a cylindrical sleeve and inserting tools to impact the central core of the solid material. Still other techniques involve filling a drilled hole with water or other liquids and thereafter impacting the liquid so as to create a pressure over the side wall and cause fracturing. In yet another known technique, pre-drilled holes are filled with hydraulic fluid and a piston is then driven into the hole at speeds ranging up to several hundred meters per second to impact the fluid and cause tensile strength cracks in the material by established pressure. Such conventional techniques can be found in U.S.
Pat. No. 99,595, U.S. Pat. No. 3,988,037 and U.S. Pat. No.
3,507,540.
The above conventional techniques are well known in the art and their drawbacks are more extensively discussed in Applicant's co-owned U.S. Patent No. 5,087,100 issued February 11, 1992 and entitled METHOD OF FRACTURING ROCK OR
SIMILAR MATERIAL AND APPARATUS THEREFORE where there is provided a significant improvement over the prior art. In U.S. Patent No. 5,087,100 (hereafter referred to as '100) there is disclosed a method of fracturing rock and other material in which a hole has been pre-drilled in the area to be fractured. A slug of solid material is inserted into the bottom of the hole and the top of the slug is impacted with sufficient force to transfer the impact by hydraulic action to the sides and bottom of the hole to fracture the rock or other similar material. In the method disclosed, the slug may be substituted with an inner slug and an outer slug wherein both slugs are of a solid material. While the method and apparatus disclosed in U.S. Pat. No. '100 provide a simpler and more reliable solution to fracturing rock over previous techniques, the reduction of rock results from a single point in the structure which limits the yield of fractured material acheived. As a result, there continues to remain a need in the art to fracture a rock structure in a way that improves the yield of fractured material and which allows for deeper drill holes without significant increases in complexity or cost.
Furthermore, many conventional methods of fracturing rock are also known to result in large seismic velocities. This problem is of particular concern when fracturing rock in and around pre-existing structures (eg.
buildings) susceptible to such seismic activity.
Accordingly, it is an object of the invention to provide an alternate method and apparatus for fracturing rock which fulfills the above needs in the art.
SUD~ARY OF THE lNV~5N ION
Broadly speaking, the present invention contemplates a method of fracturing a hard compact material such as rock or concrete which has a hole pre-drilled in the area to be fractured. According to the method, the hole is filled with an aggregate of friable material which is then impacted with a force sufficient to crush a portion of the aggregate proximate the point of impact into crushed material which then transfers the force of the impact to the sides of the hole so as to fracture surrounding material.
The method may include repeating the impacting step so as to fracture material surrounding the hole in progression along an axis of the hole. In the impacting step the aggregate may be reduced to a fine powder which then locks to the sides of the hole. The method may also include positioning an impact pin at an open end of the hole next to the aggregate and then, in the impacting step, directing an impact force on the impact pin.
In another aspect of the invention, there is provided a method of fracturing a large region of hard compact material such as rock or cement. In this embodiment, a plurality of holes are drilled in the hard compact material so as to define a predetermined pattern. Each of the holes are filled with an aggregate of friable material. An elongated impact pin is positioned above one of the holes next to the aggregate. The aggregate in the one hole is then impacted as previously discussed so as to fracture material surround the hole. The positioning and impacting steps are then repeated for the r~m~;n;ng holes.
There is also contemplated within the scope of the invention a system for fracturing a hard compact material such as rock and cement. This system comprises a drill for drilling a hole in the compact material, an aggregate of friable material sufficient to substantially fill the hole, an impact pin dimensioned to fit substantially snugly within the hole and impacting means. The impacting means is provided for impacting the aggregate with the impact pin when oriented with the hole next to the aggregate to crush the aggregate into a powder which locks to sides of the hole so as to transfer the force of the impact upon the sides of the hole.
The hole and the impact pin may be cylindrically shaped. The impacting means may include a hammer such as a pile driving hammer.
BRIEF DESCRIPTION OF THE DRAWINGS
The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, however, as well as other features and advantages thereof, will be best understood by reference to the detailed description which follows, read in conjunction with the accompanying drawings, wherein:
Figure 1 is a cross-sectional view of a rock formation showing a series of holes filled with an aggregate and an impact pin;
Figure 2 is a cross-sectional view of a formation showing a pre-drilled hole filled with an aggregate material and having an impact pin inserted into the hole above the aggregate;
Figure 3 is a plan view of a formation with a plurality of pre-drilled holes arranged in an array;
Figure 4 is a perspective view of one example of mass rock excavation using the invention;
Figure 5 is a perspective illustration of a pile driving hammer located above a pre-drilled hole in a mass excavation site;
Figure 6, shows a conventional drill having a central drill bit.
DETAILED DESCRIPTION WITH REFERENCE TO THE DRAWINGS
In the description which follows, like numbers refer to like parts.
Referring to Figure 1, rock formation 11 includes hole 10 which has been pre-drilled near rock face 13 in the area to be fractured. Hole 10 is filled to the top with aggregate 12 which is a friable material such as, by way of example only, crushed granite. Next, an elongated rod or pin 14 made of a hard material such as steel or iron is placed on top of hole 10 and an impact force is directed vertically down on the top of pin 14 using an impacting device such as, for instance, pile driving hammer 28 in Figure 5. As shown in Figure 1, both hole 10 and pin 14 are cylindrical, although the shape of hole 10 and pin 14 may vary with the selected application.
Referring to Figure 2, while the type of impacting device may vary, the impact force applied to pin 14 must be of sufficient force to reduce aggregate 12 to a finely fragmented material or powder 16 proximate pin 14. Powder 16 has a very fine texture similar to talcum powder. As aggregate 12 is pulverized into powder 16, impact pin 14 is driven further into hole 10. Under the impact force applied to pin 14, the resulting fine powder 16 is transferred laterally from the body of the material crushed under impact pin 14 to the rock sides adjacent to breaking face 20 which enables powder 16 to transfer the energy derived from impacting pin 14 to the sides 22 of hole 10. The transfer of energy to sides 22 produces fractures 24 in rock formation 11 which radiate substantially laterally.
Since fine powder 16 which is reduced from aggregate 12 will become lodged in sides 22 as impact pin 14 is driven into hole 10, a continuous reduction of aggregate material 12 will occur from repeated impacts on pin 14. With repeated impacts, the rock formation will begin to break from the opening of hole 10 laterally to the face in a progression as pin 14 is driven further into hole 10. This process continues to fracture the rock from the top of hole 10 to the bottom with the fractures radiating progressively laterally from the aggregate 12 under the impact pin.
As can be seen in Figure 2, repeated impacts on pin 14 cause aggregate 12 to be reduced on a gradient from powder 16 near the impact face of pin 14 to larger friable material 26 as the distance increases from pin 14. This progressive gradient allows one to fracture rock along hole 10 to great depths which allows one to obtain a large yield of fractured rock for each hole drilled. Advantageously, the progressive nature of the fracturing through successive blows also results in relatively low levels of seismic velocities to complete the fracturing of a rock structure. This factor is particularly important when fracturing rock in and around pre-existing structures which may be susceptible to large seismic velocities, such as those produced with explosives where substantially higher energy levels are required to shatter rock.
Referring to Figure 3, in applying the present invention to mass rock excavation, a plurality of holes 20 are typically drilled in a predetermined pattern 18 proximate a face 20 or bench of a rock formation, as shown in Figure 2.
The arrangement of holes 20 in pattern 18 may be several meters apart, although it will be understood that the distance between holes and the selected pattern will vary depending upon the tensile strength of the material to be fractured and the size of the system used. As can be seen in Figure 1, the depth of the pre-drilled holes may be several times deeper than the lateral dimension of the pattern. By way of example, a two meter pattern may be drilled up to 3 to 10 meters in depth or more, depending on the desirable yield.
Referring to Figure 4, there is shown by way of example another application of the invention to mass excavation. In the example shown, pre-drilled holes 37 are arranged in an array 31 near the face of structure 33 having a five meter bench 35. Holes 37 in each row of array 31 are spaced approximately 2 meters apart and are preferably substantially the same depth as bench 35. As previously noted, however, the particular arrangement of the holes and their depths will vary with the selected rock structure.
Referring to Figure 5, there is shown, by way of example only, application of the invention using pile driving hammer 28 and crane 38. In the example shown, hammer 28 includes drop weight 40 of five tons which is raised approximately 2.5 to 3 meters so as to generate a force of approximately 150 Kilo Joules. When drop weight 40 is released and impacts with an impact pin in the selected drill hole, impact forces of up to 1,000 tons or more are generated in a typical impact pin with a 10 cm diameter. The resulting energy is then transferred into the aggregate which has the effect of further reducing the aggregate into a powder which is forced laterally to inner surfaces of the pre-drilled hole. Forces of 100 tons per square inch along the inner surfaces of the hole are typical. While Figure 5 illustrates one embodiment, it will be appreciated that as envisioned within the scope of the present invention, the system used may be scaled up or down for the desired application.
Referring to Figure 6, there is shown a conventional drill 50 having a central drill bit 52 used to drill holes in rock formation 11 for application of the above method of graduated fracturing of a rock face.
It will be obvious to one skilled in the art that the system and method for fracturing rock or other material contemplated by this invention may be implemented to achieve the functionality envisioned herein in various ways. It will be further obvious that the invention contemplated is advantageous in fracturing rock or similar material in various situations. It will be further obvious that the aggregate used may comprise of any friable material that can readily be reduced to a powder, making the method and system disclosed very economical. It will be further obvious that the diameter and length of the impact pin may vary with the selected application, as may the type of impacting device.
Accordingly, while this invention has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense. Various modifications of the illustrative embodiments, as well as other embodiments of the invention, will be apparent to persons skilled in the art upon reference to this description. It is therefore contemplated that the appended claims will cover any such modifications or embodiments as fall within the true scope of the invention.
OR SIMILAR MATRRTl~T~
FIELD
The present invention relates to a method and apparatus for fracturing rock or other similar material in a way so as to achieve removal of such material.
BACKGROUND
Conventional techniques for breaking rock include drilling into rock and setting explosive charges to blast away rock sections. Another known technique involves drilling a hole in the shape of a cylindrical sleeve and inserting tools to impact the central core of the solid material. Still other techniques involve filling a drilled hole with water or other liquids and thereafter impacting the liquid so as to create a pressure over the side wall and cause fracturing. In yet another known technique, pre-drilled holes are filled with hydraulic fluid and a piston is then driven into the hole at speeds ranging up to several hundred meters per second to impact the fluid and cause tensile strength cracks in the material by established pressure. Such conventional techniques can be found in U.S.
Pat. No. 99,595, U.S. Pat. No. 3,988,037 and U.S. Pat. No.
3,507,540.
The above conventional techniques are well known in the art and their drawbacks are more extensively discussed in Applicant's co-owned U.S. Patent No. 5,087,100 issued February 11, 1992 and entitled METHOD OF FRACTURING ROCK OR
SIMILAR MATERIAL AND APPARATUS THEREFORE where there is provided a significant improvement over the prior art. In U.S. Patent No. 5,087,100 (hereafter referred to as '100) there is disclosed a method of fracturing rock and other material in which a hole has been pre-drilled in the area to be fractured. A slug of solid material is inserted into the bottom of the hole and the top of the slug is impacted with sufficient force to transfer the impact by hydraulic action to the sides and bottom of the hole to fracture the rock or other similar material. In the method disclosed, the slug may be substituted with an inner slug and an outer slug wherein both slugs are of a solid material. While the method and apparatus disclosed in U.S. Pat. No. '100 provide a simpler and more reliable solution to fracturing rock over previous techniques, the reduction of rock results from a single point in the structure which limits the yield of fractured material acheived. As a result, there continues to remain a need in the art to fracture a rock structure in a way that improves the yield of fractured material and which allows for deeper drill holes without significant increases in complexity or cost.
Furthermore, many conventional methods of fracturing rock are also known to result in large seismic velocities. This problem is of particular concern when fracturing rock in and around pre-existing structures (eg.
buildings) susceptible to such seismic activity.
Accordingly, it is an object of the invention to provide an alternate method and apparatus for fracturing rock which fulfills the above needs in the art.
SUD~ARY OF THE lNV~5N ION
Broadly speaking, the present invention contemplates a method of fracturing a hard compact material such as rock or concrete which has a hole pre-drilled in the area to be fractured. According to the method, the hole is filled with an aggregate of friable material which is then impacted with a force sufficient to crush a portion of the aggregate proximate the point of impact into crushed material which then transfers the force of the impact to the sides of the hole so as to fracture surrounding material.
The method may include repeating the impacting step so as to fracture material surrounding the hole in progression along an axis of the hole. In the impacting step the aggregate may be reduced to a fine powder which then locks to the sides of the hole. The method may also include positioning an impact pin at an open end of the hole next to the aggregate and then, in the impacting step, directing an impact force on the impact pin.
In another aspect of the invention, there is provided a method of fracturing a large region of hard compact material such as rock or cement. In this embodiment, a plurality of holes are drilled in the hard compact material so as to define a predetermined pattern. Each of the holes are filled with an aggregate of friable material. An elongated impact pin is positioned above one of the holes next to the aggregate. The aggregate in the one hole is then impacted as previously discussed so as to fracture material surround the hole. The positioning and impacting steps are then repeated for the r~m~;n;ng holes.
There is also contemplated within the scope of the invention a system for fracturing a hard compact material such as rock and cement. This system comprises a drill for drilling a hole in the compact material, an aggregate of friable material sufficient to substantially fill the hole, an impact pin dimensioned to fit substantially snugly within the hole and impacting means. The impacting means is provided for impacting the aggregate with the impact pin when oriented with the hole next to the aggregate to crush the aggregate into a powder which locks to sides of the hole so as to transfer the force of the impact upon the sides of the hole.
The hole and the impact pin may be cylindrically shaped. The impacting means may include a hammer such as a pile driving hammer.
BRIEF DESCRIPTION OF THE DRAWINGS
The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, however, as well as other features and advantages thereof, will be best understood by reference to the detailed description which follows, read in conjunction with the accompanying drawings, wherein:
Figure 1 is a cross-sectional view of a rock formation showing a series of holes filled with an aggregate and an impact pin;
Figure 2 is a cross-sectional view of a formation showing a pre-drilled hole filled with an aggregate material and having an impact pin inserted into the hole above the aggregate;
Figure 3 is a plan view of a formation with a plurality of pre-drilled holes arranged in an array;
Figure 4 is a perspective view of one example of mass rock excavation using the invention;
Figure 5 is a perspective illustration of a pile driving hammer located above a pre-drilled hole in a mass excavation site;
Figure 6, shows a conventional drill having a central drill bit.
DETAILED DESCRIPTION WITH REFERENCE TO THE DRAWINGS
In the description which follows, like numbers refer to like parts.
Referring to Figure 1, rock formation 11 includes hole 10 which has been pre-drilled near rock face 13 in the area to be fractured. Hole 10 is filled to the top with aggregate 12 which is a friable material such as, by way of example only, crushed granite. Next, an elongated rod or pin 14 made of a hard material such as steel or iron is placed on top of hole 10 and an impact force is directed vertically down on the top of pin 14 using an impacting device such as, for instance, pile driving hammer 28 in Figure 5. As shown in Figure 1, both hole 10 and pin 14 are cylindrical, although the shape of hole 10 and pin 14 may vary with the selected application.
Referring to Figure 2, while the type of impacting device may vary, the impact force applied to pin 14 must be of sufficient force to reduce aggregate 12 to a finely fragmented material or powder 16 proximate pin 14. Powder 16 has a very fine texture similar to talcum powder. As aggregate 12 is pulverized into powder 16, impact pin 14 is driven further into hole 10. Under the impact force applied to pin 14, the resulting fine powder 16 is transferred laterally from the body of the material crushed under impact pin 14 to the rock sides adjacent to breaking face 20 which enables powder 16 to transfer the energy derived from impacting pin 14 to the sides 22 of hole 10. The transfer of energy to sides 22 produces fractures 24 in rock formation 11 which radiate substantially laterally.
Since fine powder 16 which is reduced from aggregate 12 will become lodged in sides 22 as impact pin 14 is driven into hole 10, a continuous reduction of aggregate material 12 will occur from repeated impacts on pin 14. With repeated impacts, the rock formation will begin to break from the opening of hole 10 laterally to the face in a progression as pin 14 is driven further into hole 10. This process continues to fracture the rock from the top of hole 10 to the bottom with the fractures radiating progressively laterally from the aggregate 12 under the impact pin.
As can be seen in Figure 2, repeated impacts on pin 14 cause aggregate 12 to be reduced on a gradient from powder 16 near the impact face of pin 14 to larger friable material 26 as the distance increases from pin 14. This progressive gradient allows one to fracture rock along hole 10 to great depths which allows one to obtain a large yield of fractured rock for each hole drilled. Advantageously, the progressive nature of the fracturing through successive blows also results in relatively low levels of seismic velocities to complete the fracturing of a rock structure. This factor is particularly important when fracturing rock in and around pre-existing structures which may be susceptible to large seismic velocities, such as those produced with explosives where substantially higher energy levels are required to shatter rock.
Referring to Figure 3, in applying the present invention to mass rock excavation, a plurality of holes 20 are typically drilled in a predetermined pattern 18 proximate a face 20 or bench of a rock formation, as shown in Figure 2.
The arrangement of holes 20 in pattern 18 may be several meters apart, although it will be understood that the distance between holes and the selected pattern will vary depending upon the tensile strength of the material to be fractured and the size of the system used. As can be seen in Figure 1, the depth of the pre-drilled holes may be several times deeper than the lateral dimension of the pattern. By way of example, a two meter pattern may be drilled up to 3 to 10 meters in depth or more, depending on the desirable yield.
Referring to Figure 4, there is shown by way of example another application of the invention to mass excavation. In the example shown, pre-drilled holes 37 are arranged in an array 31 near the face of structure 33 having a five meter bench 35. Holes 37 in each row of array 31 are spaced approximately 2 meters apart and are preferably substantially the same depth as bench 35. As previously noted, however, the particular arrangement of the holes and their depths will vary with the selected rock structure.
Referring to Figure 5, there is shown, by way of example only, application of the invention using pile driving hammer 28 and crane 38. In the example shown, hammer 28 includes drop weight 40 of five tons which is raised approximately 2.5 to 3 meters so as to generate a force of approximately 150 Kilo Joules. When drop weight 40 is released and impacts with an impact pin in the selected drill hole, impact forces of up to 1,000 tons or more are generated in a typical impact pin with a 10 cm diameter. The resulting energy is then transferred into the aggregate which has the effect of further reducing the aggregate into a powder which is forced laterally to inner surfaces of the pre-drilled hole. Forces of 100 tons per square inch along the inner surfaces of the hole are typical. While Figure 5 illustrates one embodiment, it will be appreciated that as envisioned within the scope of the present invention, the system used may be scaled up or down for the desired application.
Referring to Figure 6, there is shown a conventional drill 50 having a central drill bit 52 used to drill holes in rock formation 11 for application of the above method of graduated fracturing of a rock face.
It will be obvious to one skilled in the art that the system and method for fracturing rock or other material contemplated by this invention may be implemented to achieve the functionality envisioned herein in various ways. It will be further obvious that the invention contemplated is advantageous in fracturing rock or similar material in various situations. It will be further obvious that the aggregate used may comprise of any friable material that can readily be reduced to a powder, making the method and system disclosed very economical. It will be further obvious that the diameter and length of the impact pin may vary with the selected application, as may the type of impacting device.
Accordingly, while this invention has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense. Various modifications of the illustrative embodiments, as well as other embodiments of the invention, will be apparent to persons skilled in the art upon reference to this description. It is therefore contemplated that the appended claims will cover any such modifications or embodiments as fall within the true scope of the invention.
Claims (14)
1. A method of fracturing a hard compact material such as rock or concrete which has a hole pre-drilled in the area to be fractured, the method comprising the steps of:
filling said hole with an aggregate of friable material;
and impacting said aggregate with a force sufficient to crush a portion of said aggregate proximate a point of impact into crushed material wherein said crushed material transfers the force of the impact to sides of said hole so as to fracture material surrounding said hole.
filling said hole with an aggregate of friable material;
and impacting said aggregate with a force sufficient to crush a portion of said aggregate proximate a point of impact into crushed material wherein said crushed material transfers the force of the impact to sides of said hole so as to fracture material surrounding said hole.
2. A method according to claim 1, including repeating said impacting step so as to fracture material surrounding said hole in progression along an axis of said hole.
3. A method according to claim 2, wherein said aggregate proximate the point of impact is reduced to a fine powder under said impacting step which then becomes lodged in the sides of said hole.
4. A method according to claim 1, including positioning an impact pin at an open end of said hole next to said aggregate, wherein said impact pin comprises a material harder than said aggregate and wherein said impacting step includes directing an impact force on said impact pin.
5. A method of fracturing a hard compact material such as rock or concrete which has a hole pre-drilled in the area to be fractured, the method comprising the steps of:
filling said hole with an aggregate of friable material;
positioning an elongated impact pin above said hole next to said aggregate;
impacting said aggregate with said impact pin using a force sufficient to crush a portion of said aggregate proximate a point of impact into crushed material wherein said crushed material transfers the force of the impact to sides of said hole so as to fracture material surrounding said hole.
filling said hole with an aggregate of friable material;
positioning an elongated impact pin above said hole next to said aggregate;
impacting said aggregate with said impact pin using a force sufficient to crush a portion of said aggregate proximate a point of impact into crushed material wherein said crushed material transfers the force of the impact to sides of said hole so as to fracture material surrounding said hole.
6. A method according to claim 5, including repeating said impacting step so as to fracture material surrounding said hole in progression along an axis of said hole.
7. A method according to claim 6, wherein said aggregate proximate the point of impact is reduced to a fine powder under said impacting step which then becomes lodged in the sides of said hole.
8. A method of fracturing a large region of hard compact material such as rock or cement, the method comprising the steps of:
drilling a plurality of holes in said hard compact material so as to define a predetermined pattern;
filling each of said holes with an aggregate of friable material;
positioning an elongated impact pin above one of said holes next to said aggregate;
impacting said aggregate with said impact pin using a force sufficient to crush a portion of said aggregate proximate a point of impact into crushed material wherein said crushed material transfers the force of the impact to sides of said hole so as to fracture material surrounding said hole; and repeating said positioning and impacting steps for a remaining number of said plurality of holes.
drilling a plurality of holes in said hard compact material so as to define a predetermined pattern;
filling each of said holes with an aggregate of friable material;
positioning an elongated impact pin above one of said holes next to said aggregate;
impacting said aggregate with said impact pin using a force sufficient to crush a portion of said aggregate proximate a point of impact into crushed material wherein said crushed material transfers the force of the impact to sides of said hole so as to fracture material surrounding said hole; and repeating said positioning and impacting steps for a remaining number of said plurality of holes.
9. A method according to claim 8, wherein said impacting step includes repeatedly impacting said aggregate with said impact pin so as to fracture material surrounding said hole in progression along an axis of said hole.
10. A method according to claim 9, wherein said aggregate proximate the point of impact is reduced to a fine powder under said impacting step which then becomes lodged in the sides of said hole.
11. A system for fracturing a hard compact material such as rock and cement, the system comprising:
(a) a drill operative to drill a hole in said hard compact material;
(b) an aggregate of friable material sufficient to substantially fill said hole;
(c) an impact pin dimensioned to fit substantially snugly within said hole; and (d) impacting means for impacting said aggregate with said impact pin when oriented with said hole next to said aggregate to crush said aggregate into a powder which locks to sides of said hole so as to transfer the force of said impact upon the sides of said hole.
(a) a drill operative to drill a hole in said hard compact material;
(b) an aggregate of friable material sufficient to substantially fill said hole;
(c) an impact pin dimensioned to fit substantially snugly within said hole; and (d) impacting means for impacting said aggregate with said impact pin when oriented with said hole next to said aggregate to crush said aggregate into a powder which locks to sides of said hole so as to transfer the force of said impact upon the sides of said hole.
12. A system according to claim 11, wherein said hole and impact pin are cylindrically shaped.
13. A system according to claim 11, wherein said impact pin includes an elongated body.
14. A system according to claim 11, wherein said impacting means includes a hammer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2212993 CA2212993A1 (en) | 1997-08-13 | 1997-08-13 | Method and apparatus for fracturing rock or similar material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2212993 CA2212993A1 (en) | 1997-08-13 | 1997-08-13 | Method and apparatus for fracturing rock or similar material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2212993A1 true CA2212993A1 (en) | 1999-02-13 |
Family
ID=29274964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2212993 Abandoned CA2212993A1 (en) | 1997-08-13 | 1997-08-13 | Method and apparatus for fracturing rock or similar material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2212993A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7032978B2 (en) | 2004-03-05 | 2006-04-25 | In Suk Baek | Crushing method using large boreholes in underwater rock |
-
1997
- 1997-08-13 CA CA 2212993 patent/CA2212993A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7032978B2 (en) | 2004-03-05 | 2006-04-25 | In Suk Baek | Crushing method using large boreholes in underwater rock |
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