RU2343287C2 - Anchor bolt - Google Patents

Anchor bolt Download PDF

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Publication number
RU2343287C2
RU2343287C2 RU2005141565/03A RU2005141565A RU2343287C2 RU 2343287 C2 RU2343287 C2 RU 2343287C2 RU 2005141565/03 A RU2005141565/03 A RU 2005141565/03A RU 2005141565 A RU2005141565 A RU 2005141565A RU 2343287 C2 RU2343287 C2 RU 2343287C2
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RU
Russia
Prior art keywords
drilling
sleeve
rod
drill
elongated
Prior art date
Application number
RU2005141565/03A
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Russian (ru)
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RU2005141565A (en
Inventor
Росс СИДСМАН (AU)
Росс СИДСМАН
Original Assignee
Дьюнфаер Пти Лтд
Priority date (The priority date 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 date listed.)
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Publication date
Priority to AU2003902774A priority Critical patent/AU2003902774A0/en
Priority to AU2003902774 priority
Priority to AU2004900773 priority
Priority to AU2004900773A priority patent/AU2004900773A0/en
Application filed by Дьюнфаер Пти Лтд filed Critical Дьюнфаер Пти Лтд
Publication of RU2005141565A publication Critical patent/RU2005141565A/en
Application granted granted Critical
Publication of RU2343287C2 publication Critical patent/RU2343287C2/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0033Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0053Anchoring-bolts in the form of lost drilling rods
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/008Anchoring or tensioning means

Abstract

FIELD: mining.
SUBSTANCE: invention refers to drilling elements and anchor bolts used at mining works and tunneling. The drilling element has opposed the first and second ends and a rod passing between the ends. At least one drilling head is positioned on the first end. The second end is adjusted for connection to a drilling facility to ensure rotation of the drilling element and to transfer axial force onto it. Along and around the rod there is assembled a bushing while the passage formed between the bushing and the rod facilitates flowing of fluid medium along the rod. Also there is suggested the drilling bit, the method of drilling with a drilling element and the method of stabilisation of rock.
EFFECT: increased efficiency of process of rock bolting and reduced costs for drilling elements.
57 cl, 31 dwg

Description

Technical scope

The present invention relates to a drilling element and to an anchor bolt suitable for use in mining and tunneling.

BACKGROUND OF THE INVENTION

The support for supporting the roof and wall is a critical aspect of mining operations and tunneling. The walls and roofs of the shaft and tunnel consist of rock strata that must be strengthened to prevent the possibility of collapse. To strengthen the rock, anchor bolts are widely used. To this end, in the hole, transversely drilled through the rock, fix the rod and often ensure its tension. Typically, a bolt is secured by using a cementitious fluid based on a polymer or cement, which is introduced into the space around the bolt and activated.

Self-drilling anchor bolts combine drilling and bolt insertion into a drilled hole. Self-drilling anchor bolts usually have a drill bit attached to the end of the tubular steel element so that drilling of the hole and the introduction of the bolt occur simultaneously. Self-drilling anchor bolts during mining are usually not used due to the high cost of pipe steel, which must be used both to provide access to flushing and cementing fluids, and to provide the structural strength that is required to strengthen the rock.

The above discussion of the background to the invention is included here to clarify the situation related to the present invention. You should not assume that any of the opposing documents or other materials was published, was known or was part of well-known information in Australia at the priority date of any one of the claims according to this description.

Description of the invention

In the present description and claims, the word “comprise” and variations of this word, such as “comprising” and “comprises”, do not imply the exclusion of other additions, steps or integers.

According to a first aspect, the present invention provides a drill member having opposite first and second ends and a shaft (or first elongated member) extending between the ends of at least one drill bit located at a first end, the second end being for connecting to a drilling device for rotating the bolt and transmitting axial force to it, a sleeve (or a second elongated element) extending along and around the rod, and a passage formed between the sleeve and the rod for skipping fluid along the bolt shaft.

For this design, drilling fluid can be passed along the shaft and through the first end to facilitate leaching of material from the surface of the rock during drilling. Such a fluid may be water or a similar fluid in the case of a wet drilling process, or air in the case of a vacuum drilling process. In addition, the fluid can be forced to flow along the passage to the first end, or, alternatively, it can be pumped from the first end to the second end.

In one embodiment, the first end includes at least one drill bit that extends radially from the axis of the drill element a distance greater than the sleeve. In the case of such an arrangement, in use, an outer passage is formed between the side of the drilled hole and the sleeve. The formation of the outer passage helps provide a circulation path in the drilled hole, where the fluid can be directed to the first end through one passage and fed from the first end to exit the hole along the other passage.

In one embodiment, at least one drill bit is attached to one end of the shaft. In another embodiment, the drill element comprises a drill bit that is connected to the end of the shaft and includes a drill bit.

To ensure the passage of fluid along the rod, holes are created for its passage. In one embodiment, these holes are made at the respective ends of the sleeve or close to these ends. In addition, channels can be made that allow fluid to enter the passage through the sleeve, which is located around the rod close to its second end. Another channel may be formed near the first end to facilitate fluid flow between the passage and the drill bit. At least a portion of the channel that extends to the drill bit may be located within the drill element.

In one embodiment, the shaft is capable of absorbing a compressive and torsional load acting on the drilling element during drilling. In one embodiment, the sleeve has significantly lower strength than the shaft.

In one embodiment, the rod is made of steel bar. Alternatively, the core is made of fiber reinforced material, such as fiberglass.

In one embodiment, the sleeve is made of plastic. In an alternative form, the sleeve is made of sheet metal, usually thin sheet metal.

In one embodiment, the drilling element is designed to be fixed in a hole drilled by the drilling element so as to form a self-drilling anchor bolt.

In one embodiment, when the inner and outer passages are formed, such passages are used to introduce a liquid cementitious composition into the drilled hole and they can be filled with this composition to help provide the required adhesion of the bolt to the rock.

In one embodiment, the outer surface of the self-drilling anchor bolt is roughened or twisted to facilitate adhesion of the cementitious composition to the shaft. In one embodiment, the inner and outer surfaces of the sleeve are also made rough or twisted.

In one embodiment, the self-drilling anchor bolt further comprises an anchor means for fixing the anchor bolt in the drilled hole.

In a specific embodiment, the anchor device has the ability to move from a designated position in which it prevents drilling of the borehole to an expanded position in which it is designed to hold the anchor bolt in the drilled borehole.

In a specific embodiment, the bolt is able to rotate in the first direction to perform drilling and in the second, opposite direction to move the anchor means from its retracted position to the extended position.

The sleeve may be deformed by applying axial force to its first end, and when such deformation occurs, the sleeve will extend radially beyond the drill bit.

An anchor bolt, in addition, may contain an engagement surface, and in this case, the deformation of the sleeve occurs with its relative movement across such a surface. The engagement surface may be located on the shaft. Alternatively, the engagement surface may be located on the drill bit.

The sleeve may be deformed by axial compression, or it may include at least one weakened zone, which contributes to the deformation of the sleeve. At least one weakened zone may be in the form of a slot formed in the sleeve.

In one embodiment, the anchor means is located near the first end, and it acts in response to the axial movement of the rod relative to the sleeve.

In one embodiment, the anchor means forms part of the sleeve or is connected to it. In one embodiment, the anchor means is intended to deform the sleeve.

In one embodiment, the anchor means is made in the form of at least one expanding shell that can be offset in the radial outward direction. In one embodiment, the anchor bolt includes an engagement surface, wherein at least one expanding shell can be actuated by moving the engagement surface across the inner surface of the at least one expanding shell.

In one embodiment, the self-drilling anchor bolt further comprises a sleeve that extends around the shaft near its second end and can be axially offset along the shaft of the bolt.

The sleeve may be offset along the shaft in response to the movement of the coupling along the shaft.

The sleeve may be connected to the shaft by an external thread made on the shaft, which engages with the female thread mating with it on the sleeve.

In one embodiment, the anchor bolt is for connecting to a drilling device by connecting the drilling device to a sleeve.

In one embodiment, the self-drilling anchor bolt further comprises a thrust element located near the second end, wherein the thrust element can be displaced along the rod and has a thrust surface that faces the first end and protrudes radially from the axis of the bolt by a distance greater than drill bit.

In yet another embodiment, the core and sleeve of the self-drilling anchor bolt are made of a plurality of sections connected to each other.

According to yet another aspect, the invention provides a combination of a shaft and a sleeve for use in a drilling element or anchor bolt as described above. The rod is designed to be located at its first end of the drill bit. The drill bit can be connected directly to the rod, or, alternatively, it is mounted on a drill bit that is attached to the rod.

According to another aspect, the present invention provides a drill bit comprising a body with opposite ends and a wall surface extending between these ends, at least one drill bit located at one end, while the other end of the drill bit is connected to the drill rod, and at least one channel extends from the wall surface to at least one drill bit.

The drill bit may include a portion of the wall surface that tapers outward toward one end.

According to another aspect of the invention, a drilling method is provided comprising the following operations: drilling a hole in a rock using a drilling element having a drill end and an opposite end connected to a drilling device; supplying drilling fluid to the drilling end during drilling of the borehole by transporting the fluid along the outer surface of the bolt shaft.

According to yet another aspect of the invention, there is provided a method of stabilizing a rock, comprising the following operations: drilling a hole in a rock using a self-drilling anchor bolt having a drill end and an opposite end connected to a drilling device; supplying drilling fluid to the drill end during drilling of the borehole by transporting the fluid along the outer surface of the bolt shaft; fixing the anchor bolt inside the hole to stabilize the rock.

The drilling fluid may be directed along the rod into the passage formed by a sleeve located around and along the rod.

An additional passage may be formed between the bushing and the side of the borehole, while the drilling fluid flows to the drill end through one passage and is removed from the hole through the other passage.

The drilling fluid can be pumped to the drilling end from the second end, or this fluid can be pumped to the second end by means of a suction device.

A cementitious compound can be added to the hole to fix the anchor bolt relative to the rock.

Before the cementitious compound is introduced into the hole, an anchor bolt can first be fixed to the hole.

The shaft of the drill element or anchor bolt described above in arbitrary form may, for example, be a hollow rod having a circular cross section, a solid rod having a circular cross section, a hollow rod having a circular circular cross section, or a solid rod having a non circular circular section. In addition, the rod may have a smooth, axially extending outer surface or, alternatively, a rough or uneven surface, while the rough or uneven surface provides additional adhesion between the cementitious composition and the first elongated element.

The sleeve may, for example, be a hollow rod having a circular cross-section, or a hollow rod having a non-circular cross-section. The inner and outer surfaces of the sleeve can be a smooth or, as an option, rough or uneven surface, providing additional adhesion between the cementitious composition and the sleeve and between the sleeve and the rock surface. In addition, the sleeve can be made corrugated for additional adhesion between the cementitious composition and the sleeve, while the corrugation ensures the transfer of voltage between the inner and outer surfaces of the sleeve. The corrugations can be spiral or radial, while the depth of the corrugations can be proportional to the radius of the sleeve.

The rod may consist of a material having increased tensile strength and suitable for functioning as a structural element, for example, steel.

The rod may consist of a material with increased tensile strength, for example, fiberglass, suitable for functioning as a structural element, and such a structural element that can be cut off as soon as the bolt is installed in a certain position in the plane of the mine by drilling. This provides the possibility of significant excavation to the plane of the mine, where they are fastened by means of a bolt.

The sleeve may consist of a material such as metal or a composite of many elongated metal elements and a less expensive plastic tube having sufficient rigidity in the longitudinal direction to be able to engage with expanding shells. Alternatively, the sleeve may comprise a plastic tube with a non-continuous steel end sleeve.

Access channels and rod can be obtained by forging.

In one embodiment, the first end of the shaft comprises a tool in the form of a drill bit, and this tool may include at least one channel for access, providing the inflow and outflow of materials during drilling and supply of cementitious composition.

The sleeve may include a material such as metal or a composite of many elongated metal elements and a less expensive plastic tube. Alternatively, the sleeve may include a plastic tube. Preferably, the plastic tube is made of durable plastic, for example polyethylene. Plastic is not susceptible to corrosion, and if a crack is formed in the cementitious composition, the plastic tube acts as a barrier to the crack, so that water cannot reach the bolt and lead to corrosion, which shortens the life of the anchor bolt.

In an embodiment, the second end of the shaft is further provided for securing to the first end of the extension bar (or third elongated member), and the sleeve includes a second end for securing to the first end of the extension bush (or fourth elongated member).

Typically, the rod is designed to block it with an extension rod, in order to effectively prevent their relative rotation in at least one direction of rotation when locked with each other.

The anchor bolt may further comprise an extension rod and an extension sleeve in the form described above.

The drilling device may comprise rotational driving means that can be detachably connected to the second end of the shaft (in one form via a sleeve) to advance the drill bit through the rock when it is rotated in the first direction of rotation and, in one embodiment, to actuate the anchor means in first direction of rotation.

Alternatively, the drilling device comprises rotational driving means detachably connected to a fastening means for moving the drill bit through the rock during rotation in the first direction of rotation and for actuating the anchor means in the second, opposite direction of rotation.

Typically, the cementitious composition is injected into the cavity between the rod and the sleeve after drilling and lateral expansion of the sleeve.

A plate may be attached to the rod to actually prevent the relative rotation of the attachment means and the rod in the first direction of rotation.

According to yet another aspect, the present invention provides a drilling method that comprises the following steps: drilling a rock surface with a drill member that includes a shaft and a sleeve, the shaft having a first end for penetrating the rock and a second end for providing fastenings for actuation means, with washing by a cooling agent between the rod, the sleeve and the rock surface in the region of the first end of the rod; removal of the drilling element from the rock as soon as the hole of the desired depth is drilled.

The cooling and / or flushing fluids may be a liquid (eg, water) or a gas (eg, air).

Cooling and / or flushing fluids and cementitious fluids can be pumped through one or more channels.

The core may have a first end, designed to locate on it a means that serves to penetrate into the rock, such as a drill bit. This allows you to replace the drill bit when it is worn or to work in specific acceptable conditions.

According to yet another aspect, the present invention provides a rock support method comprising the steps of: drilling a rock surface with an anchor bolt comprising a shaft and a sleeve, the shaft having a first end for penetrating the rock and a second end for providing fastenings for actuation means, with washing with a cooling agent through the cavity between the rod and the sleeve, and past the surface of the rock in the area of the first end of the rod; injection of a cementing fluid between the shaft, sleeve and surface of the rock; holding for a predetermined time to harden the cementitious fluid.

According to yet another aspect, the present invention provides a rock support method comprising the steps of: (a) drilling a rock surface with an anchor bolt having a shaft and a sleeve, the shaft having a first end for penetrating the rock and a second end, designed to provide fastening for the means of actuation, with the washing of the cooling agent through the cavity between the rod and the sleeve, and past the surface of the rock in the area of the first end of the rod; (b) the use of an extension rod containing the third and fourth elongated elements and increasing the length of the rod by blocking the third elongated element with the second end of the rod, while the third elongated element contains a first end designed to block with the second end of the rod so that it is actually prevented relative rotation between the rod and the third elongated element, at least in the direction of rotation for drilling, and the fourth elongated element contains the first an end intended for fastening to the second end of the sleeve; (c) increasing the length of the sleeve by attaching the first end of the fourth elongated element to the second end of the sleeve; (d) repeating steps a, b, and c until an acceptable length is reached; (e) injection of a cementing fluid between a rod, a sleeve, an extension rod, and a rock surface; (e) holding for a predetermined period of time to set the cementitious fluid.

The method may further include the use of an anchor bolt having a rod containing a first end intended for penetration into the rock, and a part having a larger transverse dimension than the part of the sleeve intended for expansion in the transverse direction.

The method may further include tensioning the anchor bolt by means of a female thread coupling.

Cooling and / or flushing fluids, as well as cementing fluids, can be pumped through one or more channels.

The method may further include passing flushing, cooling and cementing fluids through the cavity passing between the third and fourth elongated elements, to the cavity between the rod and the sleeve and past the rock surface in the area of the first end of the rod.

An anchor bolt sleeve used in the implementation of the method may further include anchor means for expanding in the transverse direction. In this case, before step (b), the sleeve can be moved longitudinally to the first end of the rod to allow expansion of the anchor means for expanding in the transverse direction and to hold the bolt at the surface of the rock. Moving in the longitudinal direction can be performed by rotating the rod and / or sleeve, with the rod pushing the sleeve to its first end.

The movement in the longitudinal direction can be ensured by the relative rotation of the rod and the sleeve, while the pushing action will be exerted on the sleeve towards the first end of the rod, which causes the expansion of the part that is intended to expand in the transverse direction.

After that, the tension of the anchor bolt can be ensured by additional relative rotation of the rod.

Embodiments of the structure of the invention will now be described, by way of example only, with reference to the accompanying drawings. It should be borne in mind that a specific implementation according to the drawings and construction options does not replace general statements according to the preceding description of the invention.

Brief description of the attached drawings

Figa and 1b represent an anchor bolt according to the invention.

Figure 2 - anchor bolt with engaging expanding shells.

Figa, b and c - an alternative anchor bolt according to the invention.

4a, b and c are another alternative anchor bolt according to the invention.

5a, b and c are another alternative anchor bolt according to the invention.

6a, b and c are an alternative anchor bolt according to a fifth aspect of the invention.

7a, b and c are an anchor bolt according to a sixth aspect of the invention.

8a, b and c show an alternative anchor bolt according to a seventh aspect of the invention.

Figa and b - drill according to the ninth aspect of the invention.

Figures 10a, b and c are an additional alternative anchor bolt according to the invention.

11a, b and c are another alternative anchor bolt according to the invention.

The best and other ways of carrying out the invention

Fig. 1a shows an anchor bolt 10 according to an embodiment of the invention, comprising a first elongated element or rod 11 and a second elongated element or sleeve 12. The first elongated element 11 is located at least partially in the longitudinal direction inside the second elongated element 12. The first elongated the element 11 has a first end 13 at the first end of the bolt 10 in the form in this embodiment, a drill bit designed to penetrate into the rock. The second end 14 of the element 11 at the second end of the bolt is made with an external thread and is provided with a sleeve 15, which has an internal or mating internal thread and is designed to secure the actuation means by means of the hexagonal engagement zone shown in Fig. 1b. The second elongated element 12 is designed to expand in the transverse direction along at least part of its length by making the anchor means in the form of expanding shells 16.

In operation, as shown in FIG. 2, the anchor bolt 10 of FIG. 1 is inserted into the rock for drilling by attaching a drilling device (not shown) to an internally threaded sleeve 15 and rotation of the sleeve 15, the first elongated member 11 and the drill bit 13. Between the elongated elements 11 and 12, a channel, cavity or passage 17 can be formed, which is used to move water or air during drilling, to wash away waste generated during drilling, and to reduce the temperature of the drill bit 13. After drilling and insertion Foot bolt 10 into the rock sleeve 15 having internal threads is brought into reverse rotation which causes the advancement of the clutch 15 to the first end 13 of first elongate member 11 formed thereon along the mating threading. The advancement of the coupling 15 by axial force provides a forced collinear advancement to the first end of the second elongated element 12. The advancement of the second elongated element 12 causes the anchor means, in this embodiment, expanding shells 16, to mesh with a portion of the first elongated element 11 having a larger transverse dimension direction than the unexpanded transverse dimension of the expandable shells 16. The transverse force created by this engagement causes deformation in the form of expansion in the direction of the expandable shells 16, as a result of which the anchor bolt 10 is jammed in the hole drilled by the drill bit 13. The anchor means in the form of expanding shells 16 includes at least one weakening zone in the form of a slot in the second elongated element 12. The second end 14 of the first the elongated element 11 can be made (for example, by installing a finger, such as a cotter pin or spring pin secured through the end of the first elongated element 11) so that the threaded sleeve 15 cannot to be taken off.

For additional reinforcement, a liquid cementitious composition can also be injected into the channel, cavity or passage 17 between the elongated elements.

Figures 3a, b and c show an anchor bolt 20 according to an embodiment of the invention, comprising a first elongated element or rod 21 and a second elongated element or sleeve 22. The first end of the first elongated element 21 comprises, as a means of penetrating a rock or drill bit, at the same time, the drill bit 23 in the form of a wedge-shaped cutting head, which extends radially from the axis of the bolt to a distance greater than the distance to the second elongated element. The second end of the first elongated element 21 comprises a part 24 with an external thread, onto which a nut or sleeve 25 enters through an internal or mating thread made therein. The second elongated element 22 consists of an elongated hollow tube 26 having a wall having low strength, and having higher strength expandable shells or anchor means 27 located at one end. The first ends of the first and second elongated elements 21, 22 correspond to the first end of the bolt 20.

On figa shows the first elongated element 21, separated from the second elongated element 22.

FIG. 3b shows an anchor bolt 20 that performs wall drilling in a first direction of rotation by means of a drill bit 23 and actuating means for drilling or a drilling device (not shown) acting on nut 25. The end of elongated element 21 is configured in this way (for example by installing a washer attached to the end of the elongated element 21) that the nut 25 cannot be removed. The first elongated element 21 is partially located inside the elongated element 22, with the drill bit 23 protruding above the expanding shells 27. The drill bit 23 is sized to drill a hole large enough for both the first elongated element 21 and the second elongated element 22 to pass through it. At the desired depth, the nut 25 is tightened by turning it in the second direction of rotation. The washer or thrust element 28 extends beyond the hole drilled in the wall, so that tightening the nut 25 leads to a pushing action on the washer 28 to adjoin the second elongated element 22, and then press the expanding shells 27 of the second elongated element 22 to adjoin the drill bit 23. The washer 28 has a thrust surface that faces the first end of the bolt and protrudes radially from the axis of the bolt a distance greater than the drill bit 23. The drill bit 23 has a pyramidal part with a larger the outer dimension than the inner size of the expanding shells 27, so that when tightening the nut 25, the expanding shells 27 are pressed against the drill bit 23, while the expanding shells 27 expand to fit the drill bit 23, and such expansion forces the expanding shells 27 to come into contact with the sides of the hole. Fig. 3c shows an anchor bolt 20 at the end of this process with an elongated hollow tube 26 having a wall with low strength, distorted or deformed by the axial force acting on the tube, and with expanding shells 27 having higher strength that are in contact with a borehole wall.

Fig. 4a shows another anchor bolt 30 according to an embodiment of the present invention. The anchor bolt 30 comprises a first elongated element or rod 31 and a second elongated element or sleeve 32. The first elongated element or rod 31 is partially located in the longitudinal direction inside the second elongated element 32. The first elongated element 31 has a first end with an external thread 33 and a second end 34 comprising an actuation member or attachment means 35 shown in FIG. 4b in plan in section along the line CC in FIG. 4a. As shown in FIG. 4b, the actuating element 35 is surrounded by access openings or channels 36. The second elongated element 32 comprises anchor means in the form of expandable shells 38 located at its second end 39. Means for penetrating the rock or drill bit in the form of a drill bit the tip 40 has an internal thread 41, which mates with the external thread 33, and contains access holes 42 adjacent to the thread 41, as well as a central flushing hole 43, as shown in figs and 4d in transverse readings along lines A-A and B-B, respectively. The external thread 33 includes a laterally oriented plate element 45 at the first end of the first elongated element 31 to prevent the drill bit 40 from rotating in the opposite direction. The drill bit 40 comprises a tapered lower end 44. The drill bit 40 is attached to the first end by an external thread 33. The drill bit 40 protrudes expanding shell 38 and has dimensions that allow drilling of a hole having a sufficient diameter for the location of the anchor bolt 30. A flushing hole or channel 43 and about openings 36 and 42 provide input and output of materials during drilling to facilitate the completion of the drilling process. Actuation for drilling is provided by fastening the drilling mechanism or device to the drive element 35. When the hole of the required depth is drilled, the drilling mechanism is rotated back by screwing the external thread of the first end 37 into the thread 41 to tighten the drill bit 40 to the expanding shells 38, which causes the expansion of the shells 38. The plate element 45 ensures the cessation of further relative rotation of the drill bit 40 to prevent the eversion of the first elongated element of drill tip 40 during drilling.

On figa presents another anchor bolt 50 according to the invention. The anchor bolt 50 comprises a first elongated element or rod 51 and a second elongated element or sleeve 52. The first elongated element 51 is partially located in the longitudinal direction inside the second elongated element 52. The first elongated element 51 has a first end 53 and a second end 54 for arranging the nut or a sleeve 54A on which drilling actuating means or a drilling device (not shown) can be located. The second end 54 comprises a transversely oriented plate element 55 mounted so that the nut 54A cannot be removed. The first elongated member 51 also includes longitudinal grooves 56. The rock penetration tool 60 is designed to butt-weld the end 61 to the first end 53 of the first elongated member 51. The drill bit 60 comprises a cutting head or drill bit 62 and an external thread 64 that mates with an internal thread 65 of the tapering sleeve or engagement surface 63. The wider portion of the tapering sleeve 63 is located in the direction of the cutting head 62, and the narrower part is located in the alignment of the end 61 and contains access holes or channels 66. In addition, the tapered sleeve 63 of the drill bit 60 contains channels 67 and an internal thread 65, as shown in cross section along line AA in FIG. 5a. The drill bit 60 is butt-welded to the end face 53. The drill bit 60 protrudes beyond the end 57 of the second elongated member 52. The lower edge of the tapering sleeve 63 allows the drill bit 60 to pass inside the second elongated member 52 until the sleeve 63 mates in width with the inside diameter of the second elongated element 52. The drill bit 60 has dimensions that allow drilling of a hole having a sufficient diameter for the location of the anchor bolt 50. Grooves or channels 56 provide the possibility of inflow and outflow of material in the drilling process to facilitate the implementation of the drilling process. The actuation for drilling is carried out by fastening the drilling device to the nut 54A. When a hole of the required depth is drilled, the drilling device is rotated back to tighten the nut 54A against the washer or thrust member 58 and the washer 58 against the wall. The continued opposite rotation of the nut 54A causes the sleeve 63 to be pushed toward the end 57 of the second elongated member 52 by pushing the first elongated member 51 backward from the wall while holding the second elongated member in a proper position, causing the anchor device or end 57 to expand to engage the borehole wall.

Fig. 6a shows an anchor bolt 70 according to a fifth embodiment of the invention. Where the details of the anchor bolt correspond to the details according to the third aspect, the positions of FIG. An anchor bolt 70 comprises a first elongated member or shaft 71 and a second elongated member or sleeve 72. The first elongated member 71 is partially longitudinally disposed within the second elongated member 72. The first elongated member 71 comprises a first end 73A and a second end 73B for positioning the nut or a sleeve 54A on which drilling driving means (not shown) may be located. The second end 73 B comprises a substantially T-shaped hole 55A for allowing the inflow and outflow of materials during the drilling process to facilitate the completion of the drilling process. The first and second ends of the first and second elongated elements 71 and 72 correspond to the first and second ends of the anchor bolt 70. The nut 54A is welded to the first elongated element 71 so that this nut 54A cannot be removed, and so that the rotation of the nut 54A also leads the rotation of the first elongated element 71. The first end 73A of the first elongated element 71 contains means 74 for penetrating into the rock, made in the form of a drill bit. Drill bit 74 includes a cutting head or drill bit 75 and channels 76 providing a return path for flushing and cementing fluids, shown in cross section along line AA in FIG. 6c. Drill bit 74 is appropriately attached to the first end 73A of the first elongate member 71, for example, by soldering, butt welding, forging, or the like. The drill bit 74 extends beyond the end 73C of the second elongated element 72. The drill bit 74 is sized to drill a borehole with a diameter sufficient to locate the anchor bolt 70. The second elongated element 71 is corrugated, while the corrugation ensures the transfer of stress between the inner and outer surfaces of the second elongated element 71. The corrugations can be spiral or radial, and the depth of the corrugations is proportional to the radius of the second elongated element. On fig.6d shows the corrugations of the second elongated element 72. The second elongated element has corrugations on its inner and outer surfaces; the corrugation is determined by its peak 79a and depression 79b. The corrugations have a sufficient amplitude, while the center line in FIG. 6d passes through the zones of peaks 79a and troughs 79b.

The bolt according to any of the above and below embodiments may also include a corrugated second elongated member.

The second elongated element 72 is suitably held in a suitable place, for example, by means of a tapering sleeve or engagement surface, washer or thrust element, or the like. The actuation for drilling is carried out by fastening the drilling mechanism or device (not shown) to the nut 54A and rotating the first elongated element 71 and the drill bit 74 in the first direction of rotation. The engagement of the drill bit 74 with the rock requires the application of longitudinal (axial) pressure to the surface of the rock together with the rotational action of the drilling device. During drilling, the drill bit 74 is cooled by a cooling agent, which is pumped into the second cavity 78 between the rock surface and the second element 72. The cooling agent flows into and out of the second cavity 78, passing between the rock surface and the second element. When a hole of the required depth has been drilled, the cementitious fluid is pumped into the first cavity or passage 77, which is annular, between the first and second elements until the first cavity 77 is filled with cementing fluid. The cementitious fluid may also be pumped into the second cavity 78. The cooling fluid may also be supplied to and flow from the first cavity. A circulation path between the first and second cavities can be provided. The bolt 70 is then left in the hardening cementitious fluid. In general, such a T-shaped channel, available in the first elongated member, can be used in any embodiment shown. This channel, in particular, is used when a cotter pin is not used to fasten the nut to the first elongated element.

Fig. 7a shows an alternative anchor bolt 80 of a sixth embodiment of the invention. Where the parts of the anchor bolt correspond to the parts according to the fifth and sixth aspects, the positions of FIGS. 5a and 6a are used. Anchor bolt 80 comprises a first elongated member or rod 81 and a second elongated member or sleeve 82. The first elongated member 81 is partially longitudinally disposed within the second elongated member 82. It is preferred that the expandable end sleeve 87 be made of a material having increased compressive strength , for example from steel. The first elongated member 81 has a first end 83A and a second end 83B for locating a nut or sleeve 54A on which drilling actuating means or a drilling device (not shown) can be located. The first end 83A of the second elongated member 82 comprises anchor means in the form of an expandable end sleeve 87 for expanding and contacting the sides of the drilled hole. The second end 83B comprises a laterally oriented finger 55A, for example a cotter pin or spring pin mounted below the nut 54A and passing through the first elongated element 81, so that the nut 54A cannot be removed in one direction, and so that the rotation of the nut 54A rotates the first elongated element 81. The first elongated element 81 also contains access channels in the form of longitudinal grooves 56. The first end 83A of the first elongated element 81 contains a drill bit 84 designed to penetrate the rock.

The drill bit 84 comprises a cutting head or drill bit 85 and a tapering sleeve or engagement surface 86. The wider part of the sleeve 86 is located towards the cutting head 85, and the narrower part towards the end portion 87 and contains holes or channels 87A. In addition, the sleeve 86 of the drill bit 84 includes channels 90 with a shorter radial length than the rest of the sleeve 86 to provide a return path for flushing and cementing fluids, shown in cross section along line AA in FIG. 7a. Drill bit 84 is appropriately attached to sleeve 86, for example, by soldering, butt welding, forging, or the like. The tapering sleeve 86 protrudes beyond the end 83C of the second elongated member 82. The lower edge of the narrowing of the sleeve 86 allows it to extend inside the second elongated member 82 until the sleeve 86 is mated in width with the inner diameter of the second elongated member 82. The drill bit 84 is sized for drilling a hole, the diameter of which is sufficient for the location of the anchor bolt 80. Channels in the form of grooves 56 allow the inflow and outflow of materials during drilling to facilitate the drilling process. The actuation for performing drilling is carried out by fastening the drilling mechanism or device (not shown) to the nut or sleeve 54A and rotating the first elongated element 81 and the drill bit 84 in the first direction of rotation. The engagement of the drill bit 84 with the rock requires the application of longitudinal (axial) pressure to the surface of the rock in conjunction with the rotational action of the drilling device. During drilling, the drill bit 84 is cooled by a cooling agent that is pumped through access channels 56 at the second end 83B of the first elongate member 81. The cooling agent flows into the first cavity or passage 88 between the first and second elements and flows from the first cavity 88 through the access channels 87A and a flushing hole 91 in the drill bit 84 before passing back into the second cavity 89 between the rock surface and the second elongated element 82. When the hole of the required depth is drilled, the drilling mechanism they are driven in reverse rotation to press nut 54A against washer 58 and washer 58 against the wall, while washer 58 presses the second elongated element 82 against sleeve 86. Alternatively, the drilling mechanism performs additional rotation to press nut 54A against washer 58 and washer 58 against the wall so that the washer 58 presses the second elongate member 82 against the sleeve 86. After drilling and inserting the anchor bolt into the rock, the cementitious fluid is pumped through channels 56 at the second end 83B of the first elongate member 81. The cementitious fluid enters the first cavity or the passage 88 between the first and second elements and flows out of the first cavity 88 through access channels 87A and a flushing hole 91 in the drill bit 84 before flowing back to the washer 58 into the second cavity 89 between the rock surface and the second elongated element 82. The cementitious fluid is pumped until both cavities 88, 89 are filled with this fluid, after which the bolt 80 is left to be fixed in a hardening cementing fluid. Once the cementitious fluid has solidified, the anchor bolt, as an option, can be tensioned using a collar with an internal thread.

On figa, b and c shows the anchor bolt 20 according to the seventh variant embodiment of the invention. Where the details of the anchor bolt correspond to the details according to the second aspect, the positions of FIG. 3 are used. Anchor bolt 20 comprises a first elongated element or rod 21 and a second elongated element or sleeve 22. The first end of the first elongated element 21 contains, as a means of penetration into the rock, a drill bit 23 formed in the form of a wedge-shaped cutting head. The second end of the first elongated element 21 comprises a part 24 with an external thread, on which a sleeve part 25 with an internal thread mating with it is located. The second elongated element 22 consists of an elongated hollow tube 26 having a wall with low strength, and of having a greater strength end sleeve or anchor means 99 located at one end.

On figa presents the first elongated element 21, separated from the second elongated element 22.

Fig. 8b shows an anchor bolt 20 penetrating the wall in the first direction of rotation and drilling with a drill bit 23 by means of actuating means (not shown) acting on the fastening means provided by the coupling 25. The end of the elongated element 21 is made in this way (for example by installing a plate member attached to the end of the elongate member 21) that the sleeve 25 cannot be removed. The first elongated element 21 is partially located inside the second elongated element 22, with the drill bit 23 protruding above the end collar 99. The drill bit 23 is sized to drill a sufficiently large borehole to accommodate both the first elongated element 21 and the second elongated element 22. When reaching the desired depth, the sleeve 25 is tightened. The washer or thrust member 28 extends beyond the borehole drilled in the wall, so that tightening the coupling 25 causes the washer 28 to be pressed against the second elongated element 22 and then the second elongated element 22 to rest in the end collar 99. The drill bit 23 has a pyramidal part with a larger outer dimension than the inner dimension of the end sleeve 99, so that the tightening of the sleeve 25 causes the second elongated element 22 to be pressed against the end sleeve 99, while the second elongated element 22 is bent or deformed due to exposure axial force applied to it in the direction of the first end of the first elongated element 21, which forces him to come into contact with the sides of the drilled hole. On figs presents anchor bolt 20 at the end of this process, when the elongated hollow tube 26, the wall of which has a low strength, is distorted by the force acting on the tube and providing its contact with the wall of the hole. After drilling and introducing the anchor bolt 20 into the rock, cementitious fluid is pumped through the access channels 92 at the second end 96 of the first elongated member 21. This fluid enters the first cavity or passage 97 between the first and second elements and flows from the first cavity 97 through access channels 93 and a flushing hole or channel 94 in the drill end 23 before exiting back to the washer or thrust member 28 into the second cavity 98 between the rock surface and the second elongated element 22. The cementitious fluid is pumped up until both cavities 97, 98 are filled with this medium, after which the bolt 20 is left for attachment in a hardening cementitious medium.

Fig. 9a shows a drill 100 according to an eighth embodiment of the invention, comprising a first elongated element or rod 101 and a second elongated element or sleeve 102. The first elongated element 101 is partially located in the longitudinal direction inside the second element 102, which has first and second ends 103C, 103D. The first elongated element 101 comprises a first end 103A and a second end 103B having, as a fastening means, a drive element 104 on which a means for actuating the drill can go, for example, a drilling device (not shown). When the drive element 104 is rotated, the first elongated element 101 also rotates. The second end 103B of the first elongated element 101 further comprises an external thread 105. The first end 103A of the first elongated element 101 comprises a drill bit 106 intended to penetrate the rock. The drill bit 106 includes a cutting head or drill bit 107 and a central flushing hole 109. The drill bit 106 contains channels 108 that provide a return path for flushing or cementing fluid, shown in cross section along line AA in FIG. 9a. The drill bit 106 is appropriately attached to the first elongated element 101, for example, by soldering, butt welding, forging, or the like.

Drilling is performed by attaching a drilling mechanism (not shown) to the drive element 104 and rotating the first elongated element 101 and the drill bit 106 in the first direction of rotation. The engagement of the drill bit 106 with the rock requires the application of pressure in the longitudinal direction to the surface of the rock in conjunction with the rotational action of the drilling device. During drilling, the drill bit 106 is cooled by a cooling agent, which is pumped into the first cavity or passage 110A between the first and second elements 101, 102. The cooling agent flows into the first cavity 110A, through the central flushing hole or channel 109, passes channels 108 and leaves the second cavity 110B between the surface of the rock and the second element. Alternatively, the direction of flow may be reversed. When a hole is drilled of the required depth, the drilling mechanism is removed from the hole, and the hole can be used, for example, to introduce explosives or reinforcing cables. After that, the drill 100 can be used to drill another hole and, if required, the drill bit 106 can be replaced by another drill bit 106, for example, to replace a worn cutting head or drill bit 107, or in case of other drilling conditions.

Fig. 10a shows an anchor bolt 111 according to another embodiment of the invention, comprising a first elongated element or rod 112 and a second elongated element or sleeve 113. The first elongated element 112 is partially located in the longitudinal direction inside the second elongated element 113, which has a first and second ends 114C, 114D. The first elongated element 112 has a first end 114A and a second end 114B containing, as a fastening means, a drive element 115 on which a means for actuating the drill can be located, for example a drilling device (not shown). Rotation of the drive member 115 causes the first elongate member 112 to rotate. The second end 114B of the first elongate member 112 further includes an outer thread 116 for blocking rotatably with the inner thread 122 of the first end 121A of the third elongate member 112B shown in FIG. .10b. The first end 114A of the first elongate member 112 comprises a drill bit 117 designed to penetrate the rock. Drill bit 117 comprises a cutting head or drill bit 118. Drill bit 117 comprises channels 119 for providing a return path for flushing and cementing fluids, shown in cross section along line AA in FIG. 10a. The drill bit 117 is appropriately attached to the first elongated element 112, for example, by soldering, butt welding, forging, or the like. The drill bit 117 is dimensioned to allow drilling of a borehole having a diameter sufficient to locate the anchor bolt 111.

10b, an extension rod 120 is shown comprising a third elongated member 112B and a fourth elongated member 113B. The third elongated element 112B is located in the longitudinal direction partially inside the fourth elongated element 113B. The first end 121C of the fourth elongated member 113B includes a profiled protrusion designed to block with the second end 114D of the second elongated member 113 of FIG. 10a. In addition, the second end 121D of the fourth elongated element 113B includes a profiled protrusion designed to block with the first end of the sixth elongated element (not shown). The third elongated member 112B has a first end 121A and a second end 121B containing, as a means of attachment, a drive member 123 on which a means for actuating the drill can be located (not shown). The rotation of the drive element 123 leads to the rotation of the third elongated element 112B. The first end 121A of the third elongated member 112B comprises an internal thread 122 for engaging with the external thread 116 of FIG. 10a and locking with that thread, allowing rotation in the first direction. The third elongated element 112B is blocked with the first elongated element 112 so that the rotation of the third elongated element 112B in the first direction of rotation leads to the same rotation of the first elongated element 112. In this case, the rotation of the third elongated element in the first direction leads to rotation of the drill bit and drilling. The second end 121B of the third elongated member 112B includes an external thread 124 for locking, allowing rotation, with an internal thread of the first end of the fifth elongated member (not shown) in the same manner as the locking between the first and third elongated members.

11 a shows an alternative anchor bolt 130 with respect to the previous embodiment. The anchor bolt 130 comprises a first elongated member or rod 131 and a second elongated member or sleeve 132. The first elongated member 131 is located longitudinally partially inside the second elongated member 132. The second elongated member 132 comprises a first end 133C and a second end 133D. The first ends of the first and second elongated elements 131, 132 correspond to the first end of the anchor bolt 130. The second elongated element 132 is designed to deform in the form of transverse expansion along at least part of its length by creating expanding shells or anchor device 136A. The first elongated element 131 comprises a first end 133A and a second end 133B, which is designed to locate the drive element 134 on which the means for actuating the drill can be placed (not shown). The second end 133B of the first elongate member 131 is further provided for locating a nut or sleeve (not shown). The rotation of the drive member 134 causes the first elongated member 131 to rotate. The second end 133B of the first elongated member 131 further comprises an external thread 135 for providing a rotation lock with the internal thread 147 of the first end 143A of the third elongated member 131B shown in FIG. 11b when the third elongated member 131B is rotated in a first direction. The first end 133A of the first elongated element 131 comprises a drill bit 137 designed to penetrate into the rock. The drill bit 137 includes a cutting head or drill bit 138 and a tapering sleeve or engagement surface 136. The wider part of the sleeve 136 is located towards the cutting head 138, and the narrower part is towards the first end 133C of the second elongated element 132. In addition, the sleeve 136 contains channels 139 providing a return path for flushing and cementing fluids, shown in cross section along line AA in FIG. 11a. Drill bit 137 is appropriately attached to the first elongated member 131, for example, by soldering, butt welding, forging, or the like. The drill bit 137 extends beyond the end 133C of the second elongated member 132. The lower edge of the sleeve 136 allows the drill bit 137 to pass inside the second elongated member 132 until the sleeve 136 is mated in width with the inner diameter of the second elongated member 132. The drill bit 137 has dimensions that allow drilling of a borehole having a sufficient diameter for the location of the anchor bolt 130.

11b shows an extension rod 140 comprising a third elongated member 131B and a fourth elongated member 132B. The third elongated element 131B partially extends in the longitudinal direction inside the fourth elongated element 132B. The first end 143C of the fourth elongated member 132B comprises a profiled protrusion for locking with the second end 133D of the second elongated member or sleeve 132 of FIG. 11a. In addition, the second end 143D of the fourth elongated member 132B includes a profiled protrusion designed to block with the first end of the sixth elongated member (not shown). The third elongated element 131B has a first end 143A and a second end 143B containing, as a fastening means, a drive element 144 on which a means for actuating the drill can be located (not shown). The second end 143B of the third elongated member 131B is further adapted to locate the nut or sleeve 145. Rotating the drive member 144 allows the third elongated member 131B to rotate. The first end 143A of the third elongated element 131B has an internal thread 147 for engaging and locking with the internal thread 135 of FIG. 11a, as described above. The third elongate member 131B is blocked with the first elongate member 131 so that rotating the third elongate member 131B in the first direction causes the same elongate member 131 to rotate the same way. Thus, rotating the third elongate member in the first direction will rotate the drill bit and allow for drilling. The second end 143B of the third elongated element 131B has an external thread 146 for blocking, allowing rotation, with an internal thread of the fifth elongated element (not shown).

It will be understood that in the same manner as described above, other extension cords can be inserted while connecting other extension rods. Each extension rod is preferably configured so that another, identical extension rod can extend into it from either or each end and function as described above for drilling deeper bolt holes. In addition, only one extension bar can be used to create a smaller hole. An anchor bolt according to an embodiment of the present invention comprises a combination of the first and second elongated elements together with one or more extenders as described above.

Bolts according to any of the preceding embodiments may be combined with extension rods as described above.

Drilling is performed by attaching a drilling mechanism or device (not shown) to a fastening means or collar that provide a drive element 115 according to FIG. 10a, and rotating the first elongated element 112 and the drill bit 117 in a first direction of rotation. The engagement of the drill bit 117 with the rock requires the application of longitudinal (axial) pressure to the surface of the rock in conjunction with the rotational action of the drilling device. During drilling, the drill bit 117 is cooled by a cooling agent, which is pumped into the second cavity 110B between the rock surface and the second element 113. Next, the cooling agent is returned through its flow into the first cavity or passage 110A and out of this passage between the first elongated element 112 and the second elongated element 113.

Alternatively, the cooling agent can be injected into the first cavity 110A between the first elongated element 112 and the second elongated element 113 and returned through the second cavity 110B between the rock surface and the second elongated element 113.

The length of the bolt is increased by using the extension rod 120 of FIG. 10b, which allows the extension of the anchor bolt 111 to be extended. For drilling, the extension rod 120 is attached to the second end 114B of the first extension member 112. The drilling is actuated by attaching a drilling mechanism or device ( not shown) to the fastening means provided by the drive member 123 of the extension rod 120 and rotating the third elongated member 112B in the first direction of rotation. Thereafter, the first end 121C of the fourth elongated member 113B is secured to the second end 114D of the second elongated member 113 by means of a fastener, for example a quick coupler.

The depth of the borehole is then increased by attaching a drilling mechanism (not shown) to the fastening means provided by a drive member 123 that rotates the now connected first and third elongated members 112, 112B and the drill bit 118 in a first direction of rotation. During drilling, the drill bit 118 is cooled by a cooling agent, which is injected into the first cavity 110A, which now extends between the rock surface and the first and third elongated elements 112, 112B. The cooling agent flows into the first cavity 110A and flows from the second cavity 110B between the rock surface and the first and second, and third and fourth elements 112, 112B, 113, 113B.

When a hole of the required depth is drilled, the cementitious fluid is pumped into the first cavity 110A between the connected first and third elongated elements 112, 112B and the second and fourth elongated elements 113, 113B connected until the cavity 110A is filled with cementitious fluid. The cementitious fluid can also be injected into the second cavity 78 between the rock surface and the connected second and fourth elongated elements. Then, the elongated bolt 111, 120 is left to be fastened in a hardening cementing fluid. A circulation path can be formed in which a liquid cementitious mortar is passed into one of the first or second cavities 110A, 78 and will pass into the other of the cavities in the area of the first end of the first elongated element, while it will fill both cavities.

The extension bolt drilling of FIG. 11 is performed in the same manner as described above with respect to FIG. 10, except that when a hole of the required depth is drilled, the nut or sleeve 145 is rotated along the external thread 146 of the third elongated member 131B, which leads to advancement nuts 145 to the first end 143A of the third elongate member 131B, as well as to advancing the fourth elongate member 132B (and therefore the second elongate member 132 attached). Continuing the rotation of the nut 145 results in the narrowing of the sleeve 136 to the first end 133C of the second elongated member or sleeve 132, which causes the expandable shells 136A to expand to engage the borehole wall.

It will be understood that in the same manner as described above, additional extensions can be introduced by connecting additional extension rods. Each extension rod is preferably designed so that an additional extension rod, identical to it, from either or from each end can come onto it, while it functions as described above for drilling deeper bolt holes. In addition, only one extension bar can be used to produce a smaller bolt hole.

It will be appreciated that only one anchor bolt 130 of FIG. 11a can be used to produce a smaller bolt hole. A nut 145 (not shown in FIG. 11a) is connected via the external thread 135 of the first elongated element 131. The nut 145 is rotated by the external thread 135 of the first elongated element 131, which causes the nut 145 to advance to the first end 133A of the first elongated element 131, as well as the second elongated member 132. Continued rotation of the nut 145 causes the sleeve of the sleeve 136 to be tightened to the first end 133C of the second elongated member 132, causing the expandable shells 136A to expand to engage the borehole wall.

It will be understood that, without departing from the spirit or scope of the present invention, various variations and / or additions may be made to the particular structure and arrangement of the previously described parts.

Claims (60)

1. A drilling element having opposite first and second ends, and a rod extending between the ends of at least one drill bit located on the first end, the second end being adapted to be connected to the drilling device to provide rotation of the drilling element and transmit axial forces on it, a sleeve extending along and around the rod, and a passage formed between the sleeve and the rod to allow fluid to flow along the rod.
2. The drill element according to claim 1, in which at least one drill bit extends radially from the axis of the drill element at a distance greater than the sleeve.
3. The drill element according to claim 1 or 2, in which at least one drill bit is attached to one end of the rod.
4. The drill element according to claim 1, further comprising a drill bit connected to one end of the shaft and including at least one drill bit located thereon.
5. The drill element according to claim 1, which has openings for passage near or at each of the opposite ends of the sleeve.
6. The drill element according to claim 1, additionally containing a sleeve extending around the rod near its second end.
7. The drilling element according to claim 6, additionally containing at least one channel for the flow of fluid into the passage or from the passage through the sleeve.
8. The drilling element according to claim 7, in which at least one channel is formed between the shaft and the sleeve.
9. The drill element of claim 1, further comprising at least one channel formed at the first end to facilitate fluid flow between the passage and the drill bit.
10. The drilling element according to claim 9, in which at least a portion of the channel at the first end is located inside the drilling element.
11. The drilling element according to claim 1, in which the rod is able to absorb the compressive load acting on the drilling element during drilling.
12. The drilling element according to claim 11, in which the sleeve has a significantly lower compressive strength than the rod.
13. The drilling element according to claim 11, in which the rod is made of steel bar.
14. The drilling element according to claim 11, in which the rod is made of fiber reinforced material.
15. The drilling element according to claim 11, in which the sleeve is made of plastic.
16. The drilling element according to claim 11, in which the sleeve is made of sheet material.
17. The drilling element according to claim 1, intended for mounting in a hole drilled by a drilling element to form a self-drilling anchor bolt.
18. The drilling element according to 17, in which the outer surface of the rod is made rough to facilitate adhesion of the cementitious composition with the rod.
19. The drilling element according to claim 18, wherein the outer surface of the shaft is corrugated.
20. The drill element according to claim 17, further comprising an anchor means for holding the anchor bolt when it is located in a drilled hole.
21. The drilling element according to claim 20, in which the anchor means is adapted to be moved from a retracted position in which it does not impede the drilling of the borehole to an expanded position in which it is intended to hold the anchor bolt in the drilled borehole.
22. The drilling element according to item 21, in which the anchor bolt is able to rotate in the first direction to perform drilling, and in the opposite direction to move the anchor means from the retracted position to the extended position.
23. The drill element according to item 21, in which the sleeve is able to deform and when deformed, the sleeve extends radially beyond the drill bit.
24. The drilling element according to item 23, in which the sleeve is able to deform when axial force is applied to it.
25. The drilling element according to paragraph 24, in which the axial force is directed to the first end.
26. The drill element according to item 23, in which the anchor bolt further comprises at least one engagement surface, and the sleeve is able to deform when it is relative to move across the engagement surface.
27. The drill element according to p. 26, further comprising a drill bit attached to the first or second end of the rod and comprising at least one tip, while the engagement surface is located on the drill bit.
28. The drilling element according to paragraph 24, in which the sleeve is able to deform under axial compression.
29. The drilling element according to item 23, in which the sleeve includes at least one weakened zone, contributing to the deformation of the sleeve.
30. The drill element according to clause 29, in which at least one weakened zone is made in the form of a slot formed in the sleeve.
31. The drilling element according to claim 30, wherein the anchor means is located near the first end and acts in response to the axial movement of the rod relative to the sleeve.
32. The drilling element according to claim 20, in which the anchor means forms a part of the sleeve or connected to it.
33. The drilling element according to p, in which the sleeve is made of a composite structure and includes at least one metal element forming an anchor means.
34. The drilling element according to claim 20, in which the anchor means is made in the form of at least one expanding shell, capable of shifting radially outward.
35. The drill element according to clause 34, in which the anchor bolt contains at least one engagement surface, and at least one expanding shell begins to act with the relative movement of the engagement surface across the inner surface of at least one expanding shell .
36. The drill element according to claim 20, further comprising a sleeve extending around the shaft near its second end and axially displaceable along the bolt shaft.
37. The drill element according to clause 29, in which the sleeve is able to move along the rod in response to the movement of the coupling along the rod.
38. The drill element according to clause 35, in which the coupling is connected to the rod by means of an external thread on the rod, which engages with the mating internal thread of the coupling.
39. The drill element according to clause 35, in which the anchor bolt is adapted to connect at least partially to the drilling device by connecting the drilling device to the coupling.
40. The drill element according to claim 20, further comprising a thrust element located near the second end, capable of displacing along the rod and having a thrust surface facing the first end and protruding radially from the axis of the bolt at a distance greater than the drill bit.
41. The drill element according to claim 40, wherein, when using, the anchor bolt is inserted into the hole drilled by this bolt and a thrust element is installed to abut against the rock wall surrounding the drilled hole, the rod is able to be tensioned in the hole by engaging the anchor means and the thrust element with rock.
42. The drill element according to claim 40, further comprising a sleeve extending around the rod near its second end, capable of axially displacing along the bolt rod and restricting axial movement of the thrust element to the second end of the rod.
43. The drilling element according to claim 1 or 17, further comprising extension means for increasing the length of the drilling element, comprising at least one extension rod and at least one extension sleeve, each extension rod being operatively connected to the second end of the drilling element element or to the end of another extension rod, and the extension sleeve is operatively connected to the element sleeve or to the end of another extension sleeve.
44. The drill element according to item 43, in which the extension rod is connected to the second end of the anchor bolt or rod or to another extension rod with the possibility of transmission through the connection of torque and axial force.
45. A drill bit containing a body having opposite ends and a wall surface extending between the ends of at least one drill bit located at one end of the bit, and the other end of the bit is designed to connect to the drill rod, while from the wall surface to at least one drill bit passes at least one channel.
46. The drill bit according to item 45, in which the wall surface includes a part that tapers outward to one end.
47. A drilling method comprising the following steps:
drilling a borehole using a drilling element having a drill end and an opposite end connected to the drilling device;
providing drilling fluid at the drill end during drilling of the borehole by supplying drilling fluid along the outer surface of the core of the drilling element.
48. The method according to clause 47, in which the drilling fluid is directed along the rod in the inner passage formed by a sleeve located around and along the rod.
49. A method of stabilizing a rock, comprising the following steps:
drilling a borehole in the rock using a self-drilling anchor bolt having a drill end and an opposite end connected to the drilling device;
providing drilling fluid at the drilling end of the anchor bolt during drilling a hole by supplying drilling fluid along the outer surface of the rod of the anchor bolt;
fixing the anchor bolt inside the hole to stabilize the rock.
50. The method according to § 49, in which a liquid cementitious composition is introduced into the hole to secure the anchor bolt in the rock.
51. The method according to item 50, in which the anchor bolt is initially fixed inside the hole before introducing into the hole liquid cementitious composition.
52. The method according to 51, in which an anchor bolt is used, including anchor means for fixing the bolt in the hole, and the bolt is rotated in the first direction during drilling of the hole and in the second, opposite direction for fixing the bolt in the hole with an anchor device.
53. The method according to item 50, in which the anchor bolt is installed in the hole with tension before introducing into the hole cementing composition.
54. The method according to § 49, in which the drilling fluid is directed along the rod into the inner passage formed by a sleeve located around and along the rod.
55. The method according to item 54, further comprising the step of forming an external passage between the sleeve and the side of the hole.
56. The method according to claim 55, wherein the drilling fluid is supplied to the drilling end of the anchor bolt through an inner or outer passage and is removed from the borehole through another of the passageways.
57. The method according to claim 55, wherein the liquid cementitious composition is supplied into the inner and outer passages.
Priority on points:
06/03/2003 according to claims 2-12, 17-18, 20-42, 47-54;
02/16/2004 according to claims 1, 13, 15, 16, 19, 43-46;
06/03/2004 according to claims 14, 55-57.
RU2005141565/03A 2003-06-03 2004-06-03 Anchor bolt RU2343287C2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU2003902774A AU2003902774A0 (en) 2003-06-03 2003-06-03 Rock bolt
AU2003902774 2003-06-03
AU2004900773 2004-02-16
AU2004900773A AU2004900773A0 (en) 2004-02-16 Rock Bolt

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JP (1) JP2006526718A (en)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU174706U1 (en) * 2017-04-19 2017-10-30 Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный архитектурно-строительный университет" Nagel bar
RU2724176C1 (en) * 2017-01-09 2020-06-22 Минова Интернэшнл Лимитед Composite deformable rock anchor with improved range of deformations

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT501875B1 (en) * 2005-06-07 2008-05-15 Alwag Tunnelausbau Gmbh Method and device for drilling, in particular fitting or turning of a hole in ground or rock material
JP5113150B2 (en) 2006-04-06 2013-01-09 ガーフォード ピーティーワイ リミテッド Yield type lock bolt
US8087850B2 (en) 2006-07-20 2012-01-03 Fci Holdings Delaware, Inc. Rock bolt
WO2008060211A1 (en) * 2006-11-15 2008-05-22 Sandvik Intellectual Property Ab A rock bolt and an anchoring device
US8137032B2 (en) 2006-12-19 2012-03-20 Minova International Limited Anchor with grout jacket
DE102006059891A1 (en) * 2006-12-19 2008-06-26 Minova International Ltd., Witney Anchor with spreading element and filling jacket
ITPC20070010A1 (en) * 2007-02-14 2008-08-15 Cesare Melegari Equipment and method for the construction of micropiles in the soil, in particular for anchoring active tie
AU2009270337A1 (en) * 2008-07-18 2010-01-21 Nupress Tools Pty Limited Stabilising rock masses
US7625155B1 (en) 2009-03-25 2009-12-01 Safe Overhead Systems, Inc. Mine roof cable bolt assembly
WO2011087948A1 (en) * 2010-01-14 2011-07-21 Anthony John Spencer Spearing Self-drilling expandable bolt
US8584777B2 (en) 2010-06-04 2013-11-19 Dover Bmcs Acquisition Corporation Rotational drill bits and drilling apparatuses including the same
CN101858225B (en) * 2010-06-10 2011-10-12 北京中矿深远能源环境科学研究院 Constant resistance and large deformation anchor rod
MX346834B (en) 2010-06-24 2017-04-03 Nucor Corp A tensionable threaded rebar bolt.
DE102010043769B4 (en) * 2010-11-11 2015-07-09 Hilti Aktiengesellschaft Anchor assembly, especially for mining and tunneling
US9010165B2 (en) 2011-01-18 2015-04-21 Nucor Corporation Threaded rebar manufacturing process and system
AT13162U1 (en) * 2012-04-12 2013-07-15 Dywidag Systems Int Gmbh A method of drilling holes in soil and for securing an anchor in a well and apparatus therefor
SE539285C2 (en) * 2013-02-07 2017-06-20 Rock Solutions North AB rock bolt
WO2015072828A1 (en) * 2013-11-15 2015-05-21 Aguilar Vera Oscar Octavio Mining anchor with a threaded tip
CL2014001002A1 (en) 2013-12-12 2014-11-28 Ncm Innovations Pty Ltd Anchor bolt rock that includes an elongated cylindrical body having a first distal end and a second proximal end opposite a threaded portion at the second end, a first anchor located in or at the least partially located in a first end portion of the body, a second anchor, a first shaft portion between the first and the second anchor.
AU2015273708C1 (en) * 2014-06-13 2019-04-04 Sandvik Intellectual Property Ab Friction bolt
USD766142S1 (en) * 2014-06-16 2016-09-13 Pultron Composites Limited Tie rod and nut
SE538335C2 (en) * 2014-09-25 2016-05-24 Northern Mining Products Ab Energy absorbing rock bolt for potting and method prefabrication of such a rock bolt
EP3294991B1 (en) 2015-05-08 2020-07-22 Normet International Limited Locally anchored self-drilling hollow rock bolt
GB201513485D0 (en) * 2015-07-30 2015-09-16 Ihc Engineering Business Ltd Anchoring device and method
DE102017108664A1 (en) * 2017-04-24 2018-10-25 Bochumer Eisenhütte Heintzmann GmbH & Co. KG Expansion sleeve anchor with lost drill bit

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1369178A (en) * 1963-09-05 1964-08-07 Method and anchoring device applicable to retaining rods employed in mining, and for all other seals to dryness
US3851560A (en) * 1972-10-02 1974-12-03 Deane C Self-drilling expansion roof bolt
US4055051A (en) * 1976-01-08 1977-10-25 The United States Of America As Represented By The Secretary Of The Interior Unitary drill bit and roof bolt
SU826004A1 (en) * 1979-09-12 1981-04-30 Melnikov Nikolaj Self-drilling anchor
JPS6010100A (en) * 1983-06-29 1985-01-19 Minoru Yamamoto Self-drilling type lock bolt
JPS60242300A (en) * 1984-05-14 1985-12-02 Koken Boring Machine Co Construction of lock bolt
DE8509145U1 (en) 1985-03-27 1985-05-15 Ing. Guenter Klemm, Spezialunternehmen Fuer Bohrtechnik, 5962 Drolshagen, De
US4744699A (en) * 1986-05-19 1988-05-17 Baker International Corporation Single-pass roof bolt and apparatus and method for installation
DE3724165C2 (en) * 1986-09-10 1990-06-13 Gd-Anker Gmbh, 3370 Seesen, De
JPS6376100A (en) * 1986-09-19 1988-04-06 Mitsubishi Electric Corp Order settlement system
GB2206172A (en) * 1987-06-25 1988-12-29 Coal Ind Rock bolts
IT1236744B (en) * 1989-12-15 1993-03-31 Procedure to insert bars of reinforcement pipes in soils or walls of the excavation and equipment suitable for realizing said process
NO176069C (en) * 1992-09-09 1999-06-25 Irsta Stolindustri As A device for anchoring and grouting of rock bolt
DE19512122B4 (en) 1995-04-04 2007-10-18 "Alwag" Tunnelausbau Gesellschaft Mbh Anchors
DE19721857A1 (en) 1997-05-26 1998-12-03 Fischer Artur Werke Gmbh Self-drilling wall fixture anchorage point
AT408248B (en) 1997-06-18 2001-09-25 Techmo Entw & Vertriebs Gmbh Method and device for drilling holes
AUPQ009799A0 (en) * 1999-04-30 1999-05-27 Raers Corporation Pty Ltd Drilling apparatus and method for single pass bolting
GB2352671B (en) * 1999-08-03 2003-06-18 Boart Longyear Ltd Shank adapter
AU717071B1 (en) * 1999-10-29 2000-03-16 Sandvik Intellectual Property Ab Self drilling roof bolt
JP4311872B2 (en) * 2000-10-23 2009-08-12 株式会社ティーエフティー Self-drilling lock bolt device and self-drilling lock bolt method
SE0100915L (en) * 2001-03-15 2002-09-16 Atlas Copco Rock Drills Ab Method for reinforcement of rock and soil and rock bolt for performing the method
JP3878104B2 (en) * 2002-10-17 2007-02-07 エスティーエンジニアリング株式会社 Construction method of double pipe digging rock bolt using drilling rod

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2724176C1 (en) * 2017-01-09 2020-06-22 Минова Интернэшнл Лимитед Composite deformable rock anchor with improved range of deformations
RU174706U1 (en) * 2017-04-19 2017-10-30 Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный архитектурно-строительный университет" Nagel bar

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NO20055186D0 (en) 2005-11-04
US20070269274A1 (en) 2007-11-22
EP1629178A1 (en) 2006-03-01
EP1629178A4 (en) 2007-06-20
NO20055186L (en) 2006-02-17
CA2523185A1 (en) 2004-12-09
RU2005141565A (en) 2006-09-10
JP2006526718A (en) 2006-11-24
WO2004106700A1 (en) 2004-12-09

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