JP6387310B2 - Rock bolt material tube - Google Patents

Description

  The present invention relates to a material tube for a lock bolt, a lock bolt, a method for installing the lock bolt, and a method for manufacturing a material tube for a lock bolt.

  Conventionally, various rock bolts have been proposed to reinforce natural ground and tunnels. For example, Patent Literature 1 proposes an expansion / expansion-type lock bolt that expands / expands with a pressurized fluid. More specifically, the lock bolt includes a deformed pipe deformed so as to form a concave portion extending in the axial direction in a cross-sectional shape after crushing a cylindrical steel pipe having an internal space. And when constructing, first, a lock bolt is inserted in the drilling hole formed in the natural ground. When the insertion of the lock bolt is completed, the pressurized fluid is injected into the internal space from the rear end side of the lock bolt protruding from the ground. As a result, the concave portion on the surface is plastically deformed into a convex shape to expand and expand, and the lock bolt is brought into close contact with the inner wall surface of the hole. As a result, the natural ground is reinforced by the frictional force between the surface of the lock bolt and the inner wall surface of the hole.

  By the way, since the length of the rock bolt to be constructed is determined by the degree of reinforcement of the natural ground, it is common to prepare a plurality of types of lock bolts. However, it is necessary to determine the length of the rock bolt to be constructed each time depending on the state of the natural ground, and it is difficult to predict how long the lock bolt should be prepared to what extent. Therefore, when only a long lock bolt is prepared, when a short lock bolt is required, the long lock bolt is cut and used, which is uneconomical. On the other hand, when only a short lock bolt is prepared, a new long lock bolt must be ordered, and the short lock bolt is wasted.

  On the other hand, Patent Document 2 proposes a lock bolt configured by connecting a plurality of material tubes for lock bolts. In this lock bolt material pipe, screws are provided at both ends in the axial direction, and a lock bolt in which a plurality of lock bolt material pipes are connected can be formed by screwing screws together. Therefore, if a plurality of short-length lock bolt material tubes are prepared, lock bolts of various lengths according to the condition of the natural ground can be formed, and waste can be prevented from occurring. .

JP 2004-68273 A JP 2004-19359 A

  However, the lock bolt material tube of Patent Document 2 is provided with a male screw at one end and a female screw at the other end. That is, since there is a distinction between the front end side and the rear end side, it is necessary to check whether the orientation is correct when assembling. And if you are wrong, you must change direction. However, it is difficult to change the direction of the long rock bolt material pipe in a narrow space such as a tunnel, and there is a problem that workability is lowered.

  The present invention has been made in order to solve the above-described problem, and can improve the workability when assembling an expansion / expansion-diameter lock bolt. Construction of a material tube for a lock bolt, a lock bolt, and a lock bolt It is an object of the present invention to provide a method and a method for manufacturing a material tube for a rock bolt.

  The material tube for a lock bolt according to the present invention is formed in a cylindrical shape, has an internal space that is open at both ends in the axial direction, and has at least one concave portion extending in the axial direction on the outer peripheral surface, and is added to the internal space. By injecting the pressurized fluid, at least the concave portion is deformed and plastically deformed into a convex shape, and is attached to both ends of the deformed tube, and has through holes communicating with the internal space of the deformed tube. A pair of end members each having a male screw or a female screw, and the both end members are each provided with the same type of screw among the male screw and the female screw.

  According to this structure, the end member provided with the same kind of screw is attached to both ends of the material tube for rock bolt according to the present invention. That is, in this lock bolt material tube, since the screws at both ends are of the same type, they can be used without distinction between the front end and the rear end. And the lock bolt of desired length can be formed by connecting the end members of several material pipe | tubes for lock bolts. Therefore, since the lock bolt can be assembled without confirming the orientation, the assembling workability can be greatly improved.

  In the rock bolt material tube, the concave portions are crushed at both ends thereof, so that the wall surfaces of the concave portions are in close contact with each other to form a linear seam, and at least the seam is bonded, At both ends, the recess can be closed and only the internal space can be opened to the outside.

  According to this configuration, the concave portions are crushed at both ends of the material tube for the lock bolt, so that the wall surfaces of the concave portions are brought into close contact with each other so as to form a linear seam in the cross section. Therefore, at both ends of the material tube for the lock bolt, the concave portion can be closed by adhering the seam, and only the internal space can be opened to the outside. Therefore, it is only necessary to perform the bonding operation for closing the concave portion along the joint, and the operation can be easily performed.

  And, in this way, at both ends of the material tube for the lock bolt, the recesses are closed and only the internal space is opened, so that when the plurality of material tubes for the lock bolt are connected in the axial direction, only the internal spaces are connected to each other. Can be communicated in series. Therefore, when expanding and expanding the diameter of the lock bolt, the injected pressurized liquid can be distributed to all the material pipes for the lock bolt without waste.

  The first lock bolt according to the present invention has two or more of the above-described lock bolt material pipes and a through hole, and connects end members of the lock bolt material pipes adjacent to each other in the axial direction. A connecting sleeve having a male screw or a female screw, a closing member that is attached to the leading end member of the material tube for the lock bolt disposed at the top and closes the through hole of the end member, and is disposed at the end An injection member attached to the end member on the rear end side of the material tube for the lock bolt and capable of injecting a liquid into a through hole of the end member.

  A second lock bolt according to the present invention is the above-described one lock bolt material tube, a closing member attached to one of the end members of the lock bolt material tube, and closing the through hole of the end member; An injection end portion attached to the other end member of the rock bolt material tube and having an injection port through which liquid can be injected into a through hole of the end member.

  The construction method of the rock bolt which concerns on this invention is a step which prepares the material pipe | tube for rock bolts of at least 1 Claim 1, and the said rock bolt material pipes adjacent to the said elongate direction are said interior space. A step of connecting so as to communicate with each other, a step of closing a through hole of an end member on the tip side in the material tube for lock bolt arranged on the tip side, and the material tube for connected lock bolt, A step of inserting into a drilling hole in natural ground, and injecting a liquid from an end member on the rear end side of the material pipe for rock bolt arranged on the rear end side, thereby inflating each of the material pipes for lock bolt, Fixing to the hole.

  According to the present invention, there is provided a method of manufacturing a deformed pipe for a lock bolt, the step of preparing a pipe member formed in a cylindrical shape, and a part of the outer peripheral surface of the pipe member formed along the axial direction of the pipe member. A step of forming a deformed tube deformed so that the cross-sectional shape is substantially circular, and by crushing the recess at both ends of the deformed tube, A step of deforming the pipe member so that an internal space of the pipe member is divided into two in a cross-section with the seam sandwiched therebetween, and at least bonding the seam; And closing the recess at both ends.

  In the method for manufacturing a deformed tube for a lock bolt, the concave portion is crushed over a predetermined length in the axial direction from both ends of the deformed tube, and thereby, on the outer peripheral surface of the deformed tube, in the axial direction. A second seam extending and continuous with the seam is formed, and in the step of performing the bonding, the second seam can also be bonded.

  ADVANTAGE OF THE INVENTION According to this invention, workability | operativity at the time of assembling an expansion / expansion diameter type lock bolt can be improved.

It is a perspective view of the lock bolt concerning one embodiment of the present invention. It is a perspective view explaining preparation of a deformed pipe. It is the perspective view (a) of a diameter reducing die, and sectional drawing (b) of a diameter reducing die. It is the perspective view (a) of a press plug, sectional drawing (b) of a press plug, and the front view (c) which looked at the press plug from the axial direction. It is sectional drawing which shows the manufacturing method of the material pipe | tube for rock bolts. It is a perspective view which shows the edge part of the material pipe | tube for rock bolts. It is sectional drawing (a) and a perspective view (b) which show the edge part of the material pipe | tube for rock bolts. It is a perspective view of an end member. It is a partial side view of the material tube for rock bolts. It is a perspective view which shows the assembly of a lock bolt. It is sectional drawing which shows the construction method of a rock bolt. It is sectional drawing which shows the construction method of a rock bolt.

  Hereinafter, an embodiment of a lock bolt according to the present invention will be described with reference to the drawings. FIG. 1 is a side view of a lock bolt according to the present embodiment. In the following, for the convenience of explanation, the rear end side of the drilling hole into which the lock bolt is inserted may be referred to as “front end side” or “leading side”, and the opposite side may be referred to as “rear end side”. In addition, the direction in which the hole is extended and the direction in which the corresponding lock bolt extends may be referred to as an axial direction.

<1. Structure of rock bolt>
As shown in FIG. 1, the lock bolt according to the present embodiment includes a plurality (three as an example) of lock bolt material tubes 1 formed in a long shape by a steel pipe (tube member). The axial end portions are connected by connecting sleeves 4 and 5 so that the lock bolt material tubes 1 to 3 are connected along the axial direction. That is, in this example, the three rock bolt material tubes 1 to 3 are connected via the two connecting sleeves 4 and 5. Hereinafter, the three rock bolt material tubes arranged from the head toward the tail will be referred to as a first lock bolt material tube 1, a second lock bolt material tube 2, and a third lock bolt material tube 3, respectively. Further, the leading connecting sleeve is referred to as a first connecting sleeve 4, and the rear connecting sleeve is referred to as a second connecting sleeve 5.

  A tip cone (closing member) 6 is attached to the tip of the first lock bolt material tube 1, and an injection for injecting liquid into the rear end of the third lock bolt material tube 3. An adapter (water injection member) 7 is attached. Hereinafter, each member will be described in detail.

<1-1 Material tube for rock bolt>
First, the material pipes 1 to 3 for the lock bolt will be described with reference to FIG. Since the three rock bolt material tubes 1 to 3 have the same configuration, the first lock bolt material tube 1 will be described below. FIG. 2 is a perspective view for explaining a procedure for producing a material tube for a rock bolt. First, as shown in FIG. 2 (a), a hollow cylindrical steel pipe 100 having an internal space 101 is prepared and pressed into a plate shape. Then, as shown in FIG. The deformed tube 10 having a C-shaped cross section is formed so as to have a concave portion 102 that is bent in a cylindrical shape with the direction as an axial direction and extends in the axial direction. This is the basis of the material tube 1 for rock bolts. The steel pipe 100 has a thickness of about 2 to 3 mm so as to be deformed by the pressure of water supplied to the internal space 101 as will be described later. Moreover, it is preferable to make it plate shape so that the steel pipe 100 may not be crushed completely so that a fluid can flow into the internal space 101 of the steel pipe 100.

  Next, both ends of the deformed tube 10 in the axial direction are processed. In this processing, a diameter reducing die shown in FIG. 3 and a pressure plug shown in FIG. 4 are prepared.

  First, the diameter reducing die will be described with reference to FIG. FIG. 3A is a perspective view of a reduced diameter die, and FIG. 3B is a cross-sectional view of the reduced diameter die. As shown in the figure, the diameter reducing die 8 is formed in a hollow cylindrical shape, and the end of the deformed tube 10 is inserted into the internal space 80. The outer peripheral surface of the diameter reducing die 8 is configured by a small diameter portion 81 having a small diameter and a large diameter portion 82 having a large diameter arranged in the axial direction. The internal space 80 has an inner diameter that increases from the opening on the small diameter portion 81 side to the opening on the large diameter portion 82 side. More specifically, the inner diameter of the opening on the small diameter portion 81 side is substantially the same as the outer diameter of the deformed tube 10, but the opening on the large diameter portion 82 side is slightly larger than the outer diameter of the deformed tube 10. A gap is formed between the outer peripheral surface of each of them.

  Next, the pressing plug will be described with reference to FIG. 4A is a perspective view of the pressing plug, FIG. 4B is a cross-sectional view of the pressing plug, and FIG. 4C is a front view of the pressing plug viewed from the axial direction. As shown in the figure, the pressing plug 9 includes a disk-shaped main body portion 91 and a bar member 90 attached to one surface of the main body portion. A plurality of diameter-reducing blades 92 arranged in an annular shape are attached to this surface. These diameter-reducing blades 92 are formed in a rectangular plate shape so as to protrude from the main body portion 91 in the axial direction, and are arranged in an annular shape as described above, so that they are formed in an arc shape when viewed from the axial direction. ing. The diameter-reducing blades 92 are inserted into the gap between the inner peripheral surface of the inner space 80 of the diameter-reducing die 8 and the outer peripheral surface of the deformed pipe 10. Each of the diameter-reducing blades 92 has a small thickness on the tip side, and the thickness increases toward the main body 91 side.

  In addition, on the other surface of the main body portion 91, two inner air forming blades 93 are attached inside the diameter reducing blade 92 so as to face each other symmetrically in the radial direction. Each inner space forming blade 93 protrudes from one surface of the main body portion 91 in the same manner as the diameter-reducing blade 92 and is formed so that the tip is thin and becomes thicker toward the main body portion 91 side. More specifically, each inner space forming blade 93 is thin from the tip to the vicinity of the intermediate portion in the axial direction, and can be inserted into the C-shaped internal space 101 opened at the end of the deformed tube 10. The section from the axial intermediate portion to the main body portion 91 is formed in a semicircular cross section. The two inner-space forming blades 93 are arranged via a gap 94 so that the cross section from the intermediate portion to the base end portion is circular as a whole, and is fixed to the main body portion 91. In addition, the outer peripheral surface of each inner-space forming blade 93 is formed in an arc shape so as to substantially correspond to the outer peripheral surface of the deformed tube 10, and the outer diameter of the outer peripheral surface is substantially constant from the distal end to the proximal end side. It is. And it forms so that it may become thick radially inward as it goes to a base end side.

  Next, processing of both end portions of the deformed tube 10 using the diameter reducing die 8 and the pressure plug 9 will be described with reference to FIG. First, as shown in FIG. 5A, the end of the deformed tube 10 is inserted from the opening on the small diameter portion 81 side of the diameter reducing die 8. Then, the insertion is stopped when the axial end surface of the deformed tube 10 reaches the opening edge of the reduced diameter die 8 on the large diameter portion 82 side. At this time, the inner peripheral surface of the opening on the small diameter portion 81 side of the diameter reducing die 8 is substantially in contact with the outer peripheral surface of the deformed tube 10, and the inner peripheral surface of the opening on the large diameter portion 82 side and the outer peripheral surface of the deformed tube 10 are A gap is formed between them.

  Next, as shown in FIG. 5B, the pressure plug 9 is press-fitted into the opening on the large diameter portion 82 side of the diameter reducing die 8 with the diameter reducing die 8 and the deformed tube 10 fixed. At this time, as shown in FIG. 5C, the diameter-reducing blade 92 of the pressure plug 9 is inserted into the gap between the inner peripheral surface of the internal space 80 and the outer peripheral surface of the deformed tube 10. Since the diameter reducing blade 92 enters while pressing the outer peripheral surface of the deformed tube 10 radially inward, the end of the deformed tube 10 is reduced in diameter.

  At the same time, the inner space forming blade 93 is inserted into the inner space 101 of the steel pipe 100 at the end face of the deformed pipe 10. More specifically, each inner space forming blade 93 is inserted into both end sides of the internal space 101 arranged in a C-shaped cross section with the recess 102 interposed therebetween. Since each inner air forming blade 93 has a semicircular cross section as it goes to the base end side, both end portions of the inner space 101 become half as each inner air forming blade 93 enters. It is spread out in a circle and formed into two semicircles. As a result, the recess 102 is crushed to form a linear seam. Hereinafter, this seam is referred to as a first seam 103. A joint extending in the axial direction also appears on the outer peripheral surface of the deformed pipe 10 so as to be continuous with the first joint 103. This seam is referred to as a second seam 104.

  Thus, as shown in FIG. 6, the end of the deformed tube 10 is reduced in diameter by the length in the axial direction of the diameter reducing blade 92. Further, two semicircular openings 105 communicating with the internal space 101 of the steel pipe 100 are formed on the end surface of the deformed pipe 10, and a first seam 103 is formed between the openings 105. In addition, a second seam 104 is formed on the outer peripheral surface of the deformed pipe 10 continuously with the first seam 103.

  Next, as shown in FIG. 7, the first joint 103 and the second joint 104 are fixed by welding. As a result, in the axial direction of the end portion of the deformed tube 10, the above-described concave portion 102 is blocked and is not exposed to the outside, and only the semicircular opening 105 communicating with the internal space 101 is exposed to the outside. .

  Then, the end member 11 shown in FIG. 8 is attached to the part reduced in diameter at both ends of the deformed tube 10. As shown in the figure, the end member 11 is formed in a hollow cylindrical shape, and hereinafter, the end portions in the axial direction will be referred to as a first end portion 111 and a second end portion 112, respectively. The inner diameter of the end member 11 is substantially the same as the outer diameter of the end portion of the deformed deformed tube 10. On the other hand, the outer diameter of the end member 11 is substantially the same as the outer diameter of the portion of the deformed tube 10 that is not reduced in diameter. Further, a male screw 113 is formed on the outer peripheral surface of the end member 11 from the first end portion 111 to the vicinity of the intermediate portion. Then, as shown in FIG. 9, the reduced diameter portion of the deformed tube 10 is inserted into the internal space 110 of the end member 11 from the second end 112 side, and the second end 112 and the deformed tube 10 are inserted. Welding to the outer peripheral surface. Although there are various modes of welding, for example, the welding can be performed annularly along the second end portion 112. Thereby, the end member 11 is fixed to the deformed tube 10. Through the above-described steps, the material bolts 1 to 3 for the lock bolt in which the male threads 113 are formed at both ends in the axial direction are completed.

<1-2 How to assemble the components of the lock bolt>
Next, a method for manufacturing a lock bolt will be described with reference to FIG. As described above, the lock bolt includes a plurality of lock bolt material pipes 1 to 3, connecting sleeves 4 and 5 that connect the pipes, a tip cone 6 attached to the first lock bolt material pipe 1, and a third It is comprised by the water injection adapter 7 attached to the material pipe | tube 3 for rock bolts. First, each member will be described, and then an assembly method will be described.

  The connecting sleeves 4 and 5 are formed in a hollow cylindrical shape, and female screws 41 and 51 that are screwed with the male screws 113 of the lock bolt material tubes 1 to 3 are formed on the inner peripheral surface. The outer diameters of the connecting sleeves 4 and 5 are substantially the same as the outer diameter of the deformed tube 10.

  The tip cone 6 includes a hollow cylindrical connecting portion 61 and a conical cone portion 62 attached to the tip end side of the connecting portion 61 in the axial direction. The connecting portion 61 and the cone portion 62 are integrated. Is formed. On the inner peripheral surface of the connecting portion 61, a female screw that is screwed with the male screw 113 of the first lock bolt material tube 1 is formed. The outer diameter of the connecting portion 61 is almost the same as the outer diameter of the deformed tube 10. Moreover, the cone part 62 is attached so that the edge part opening of the connection part 61 may be closed.

  The water injection adapter 7 includes a hollow cylindrical connection portion 71 and a cylindrical water injection portion 72 attached to the rear end side in the axial direction of the connection portion 71. The connection portion 71 and the water injection portion 72 are: It is integrally formed. On the inner peripheral surface of the connecting portion 71, a female screw that is screwed with the male screw 113 on the rear end side of the third rock bolt material tube 3 is formed. The outer diameter of the connecting portion 71 is almost the same as the outer diameter of the deformed tube 10. Further, the water injection part 72 is attached so as to close the opening of the rear end part of the connection part 71, and a water injection path 721 extending from the rear end side to the internal space of the connection part 71 is formed.

  Then, the assembly of the lock bolt using the said member is demonstrated. First, the end members of any two rock bolt material tubes are butted in the axial direction, and the two end members 11 are connected by the connecting sleeves 4 and 5. That is, the male screw 113 of the end member 11 is screwed into the female screws of the connecting sleeves 4 and 5. As a result, the two lock bolt material tubes are connected so as to extend in the axial direction. Similarly, a desired number (three in this case) of rock bolt material tubes are connected by connecting sleeves 4 and 5. Subsequently, the tip cone 6 is attached to the end member 11 on the tip side of the first lock bolt material tube 1. That is, the end member 11 on the tip side is screwed into the female screw of the tip cone 6. Further, a water injection adapter 7 is attached to the end member 11 on the rear end side of the third lock bolt material pipe 3. That is, the end member 11 on the rear end side is screwed into the female screw of the water injection adapter 7. Thus, the lock bolt is completed.

  As described above, since the internal space of the steel pipe is exposed at the end of each of the lock bolt material tubes 1 to 3, the lock bolt material tubes 1 to 3 are connected to each other in the cylindrical connection sleeves 4 and 5. When connected with each other, the internal spaces of the adjacent rock bolt material pipes communicate with each other. Accordingly, in all of the connected rock bolt material pipes 1 to 3, the internal spaces communicate in series in the axial direction. Since the tip cone 6 is attached to the first lock bolt material tube 1, the tip of the lock bolt is closed. On the other hand, since the water injection adapter 7 is attached to the third lock bolt material tube 3, liquid can be injected into the internal space of the lock bolt.

<2. Rock bolt installation method>
Next, the construction method of the lock bolt comprised as mentioned above is demonstrated, also referring FIG. FIG. 11 is a partial cross-sectional view showing a method for constructing the lock bolt. First, the drilling hole Z is formed in the placement surface X. The drilling hole Z has an inner diameter that is slightly larger than the maximum outer diameter of the lock bolt. Next, as shown in the figure, the lock bolt prepared as described above is inserted into the hole Z. At this time, the rear end portion of the lock bolt, that is, the water injection adapter 7 is projected from the placement surface X to the outside of the ground. Subsequently, pressurized water is supplied from the water injection hose 70 connected to the water injection adapter 7 into the water injection adapter 7. The supplied pressurized water is supplied to the internal space 101 of the lock bolt. At this time, since the internal spaces of the three rock bolt material tubes 1 to 3 communicate with each other in series, the injected pressurized water quickly reaches the internal spaces of all the lock bolt material tubes 1 to 3, The internal pressure of the internal space 101 increases. As a result, the lock bolt expands from the state shown in FIG. 11A to the state shown in FIG. That is, when the pressurized water is injected into the internal space 101 of the lock bolt, the lock bolt expands in the radial direction and comes into close contact with the inner wall surface of the hole Z.

  Thereafter, the water injection adapter 7 is removed. Thereby, from the opening of the hole Z, the end member 11 at the end of the lock bolt protrudes. On the other hand, a plate 88 in which a through hole is formed is prepared, and as shown in FIG. 12A, an end member is inserted into the through hole of the plate 88 and the plate is brought into contact with the placement surface. As shown in FIG. 12 (b), subsequently, a nut 89 is screwed onto the male screw of the end member protruding from the through hole of the plate 88, and the plate 88 is tightened against the placement surface X. Thus, the construction of the lock bolt is completed.

<3. Features>
As described above, according to the present embodiment, the end members 11 each having the same type of screw, that is, a male screw, are attached to both ends of the lock bolt material tubes 1 to 3 constituting the lock bolt. That is, in the material pipes 1 to 3 for the lock bolt according to the present embodiment, the screws at both ends are the same type, and therefore can be used without distinction between the front end and the rear end. And the lock bolt of desired length can be formed by connecting the end members of the some material pipe | tubes 1-3 for lock bolts. Therefore, when assembling the lock bolt, it is possible to assemble without confirming the axial direction of the lock bolt material pipes 1 to 3, so that the assembling workability can be greatly improved.

  Moreover, in each said rock bolt material pipe | tube 1-3, when a recessed part is crushed in the both ends, it closely_contact | adheres so that the wall surface of the said recessed part may become a linear seam in a cross section. Therefore, by adhering this seam, the concave portions are closed at both ends of the lock bolt material pipes 1 to 3, and only the internal space can be opened to the outside. Therefore, at both ends of the lock bolt material tube according to the present embodiment, the concave portion can be closed by adhering only the seam, so that the operation is simple.

  And, in this way, at both ends of the material tube for the lock bolt, the recesses are closed and only the internal space is opened, so that when the plurality of material tubes for the lock bolt are connected in the axial direction, only the internal spaces are connected to each other. Can be communicated. Therefore, when expanding and expanding the diameter of the lock bolt, the injected pressurized liquid can be distributed to all the material pipes for the lock bolt without waste.

<4. Modification>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, although the external thread is formed in the end member 11 in the said embodiment, you may form an internal thread. In order to correspond to this, male threads are formed on the connecting sleeves 4 and 5. Even if it does in this way, since the same kind of screw is formed in the both ends of rock bolt material pipes 1-3 like the above-mentioned embodiment, workability of construction can be improved.

  In the above embodiment, the ends of the deformed pipes constituting the lock bolt material pipe are deformed so that the first seam and the second seam are formed, and these seams are welded. The processing method is not limited to this. That is, any processing method may be used as long as the recess is closed at the end of the deformed tube 10 and only the internal space is opened. Further, by adjusting the configuration of the end member 11, for example, even if the recess is open at the end of the deformed tube 10, the end member 11 closes the recess, and only the internal space is interposed via the end member. It can also be opened to the outside.

  In the above embodiment, the tip cone is formed in a conical shape, but the structure is not particularly limited as long as it is configured to close at least the tip opening of the leading lock bolt material tube. However, it is preferable that the diameter becomes smaller toward the tip so that it can be easily inserted into the hole. Therefore, for example, the head may be spherical, but if there is no problem in insertability, one end face of the connecting sleeves 4 and 5 may be in the form of a disk lid. Similarly, the structure of the water injection adapter is not particularly limited as long as the pressurized water can be injected into the material tube for the last rock bolt.

  In the above embodiment, a plurality of lock bolt material pipes are connected. However, a lock cone may be configured by attaching a tip cone and a water injection adapter to both ends of one lock bolt material pipe. it can.

  In the above embodiment, the deformed tube has only one recess extending in the axial direction, but the structure of the deformed tube is not particularly limited. For example, a deformed tube having recesses formed at two or more locations may be used.

1-3: Rock bolt material pipe 10: Deformed pipe 11: End member 41: Female thread 51: Female thread 101: Internal space 102: Recess 103: First seam 104: Second seam 110: Internal space

Claims (7)

Two or more material tubes for rock bolts,
At least one connecting sleeve;
A closure member;
A plate with through holes formed therein;
A nut having an internal thread;
With
Each rock bolt material tube is
It is formed in a cylindrical shape and has an internal space that is open at both ends in the axial direction, and has at least one concave portion extending in the axial direction on the outer peripheral surface, and by injecting pressurized fluid into the internal space, at least the A deformed tube in which the recess is plastically deformed into a convex shape and expands
Respectively attached to both ends of the profiled tube, and having a through-hole communicating with the internal space of the profiled pipe, a pair of end members having Flip ne male,
With
The connection sleeve has a through hole and a female screw that connects end members of the lock bolt material pipe adjacent to each other in the axial direction, and the connection sleeve includes the through hole and the lock bolt material pipe. Configured to communicate with the interior space,
The closing member is attached to the end member on the leading side of the material tube for the lock bolt arranged at the leading end, and is configured to close the through hole of the end member,
After being inserted into a drilling hole formed in a natural ground, injecting a pressurized fluid into the internal space and expanding the deformed pipes closely to the inner wall surface of the drilling hole,
The end member protruding from the hole is inserted into the through hole of the plate, and the nut is screwed into the male screw of the end member so that the plate is fastened to the ground surface. A rock bolt . One rock bolt material tube,
A closure member;
A plate with through holes formed therein;
A nut having an internal thread;
With
The material tube for the rock bolt is
It is formed in a cylindrical shape and has an internal space that is open at both ends in the axial direction, and has at least one concave portion extending in the axial direction on the outer peripheral surface, and by injecting pressurized fluid into the internal space, at least the A deformed tube in which the recess is plastically deformed into a convex shape and expands
A pair of end members attached to both ends of the deformed tube, having through holes communicating with the internal space of the deformed tube, and having external threads;
With
The closing member is attached to one end member of the material tube for the lock bolt, and is configured to close a through hole of the end member,
After being inserted into a drilling hole formed in a natural ground, injecting a pressurized fluid into the internal space and expanding the deformed pipes closely to the inner wall surface of the drilling hole,
The end member protruding from the hole is inserted into the through hole of the plate, and the nut is screwed into the male screw of the end member so that the plate is fastened to the ground surface. A rock bolt . At both ends of the lock bolt material tube, the recesses are crushed over a predetermined length in the axial direction from both ends of the deformed tube , so that the wall surfaces of the recesses are in close contact with each other in the cross section . A linear first seam is formed at both ends of the tube, and a second seam extending in the axial direction is formed on the outer peripheral surface of the deformed pipe ,
The lock according to claim 1 or 2 , wherein the first and second seams are bonded to each other so that the concave portion is closed at both ends, and only the internal space is opened to the outside. bolt. 4. The injection device according to claim 1, further comprising an injection member configured to be attachable to the end member closest to the opening of the drilling hole and capable of injecting a liquid into the through hole of the end member . Rock bolt. Inserting the lock bolt according to any one of claims 1, 3 and 4 into a boring hole in natural ground;
Preparing a plate and a nut in which a through hole is formed;
Injecting a pressurized liquid from an end member on the rear end side of the rock bolt material pipe disposed at the end, thereby inflating each lock bolt material pipe and fixing it to the drilling hole; and
A step of inserting the last end member protruding from the drilling hole into a through hole of the plate, screwing the nut into a male screw of the end member, and tightening the plate against a ground-mounting surface; When,
A construction method of rock bolts. Preparing a tubular member formed in a cylindrical shape having an internal space;
Forming a concave portion extending along the axial direction of the tube member in a part of the outer peripheral surface of the tube member, and forming a deformed tube deformed so that the cross-sectional shape is substantially circular;
Preparing a cylindrical reduced diameter die;
A pressure plug having a pair of projecting members each having a base end portion formed in a semicircular cross section, the pressure plugs being symmetrically arranged so that the flat surfaces of the pair of projecting members face each other; and
On inserting the both end portions of the deformed tube to the diameter die, by press-fitting the projection member of said pressing plugs in the internal space of the both end portions, and ulcers press the recess wall surfaces of the recess section And in close contact so as to form a linear seam, the step of deforming so that the internal space of the pipe member is divided into two in the cross section across the seam;
Bonding at least the seam, and closing the recesses at both ends of the deformed tube;
A step of attaching end members having a male screw to both ends of the deformed pipe, having a through hole communicating with the internal space, and
A method for manufacturing a material tube for rock bolts. The concave portion is crushed over a predetermined length in the axial direction from both ends of the deformed pipe, whereby a second seam extending in the axial direction and continuing to the seam is formed on the outer peripheral surface of the deformed pipe. Formed,
The manufacturing method of the material pipe | tube for rock bolts of Claim 6 which also adhere | attaches the said 2nd seam in the step which performs the said adhesion | attachment.

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