JP2017044032A - Lock bolt device, construction method thereof and coupler used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-drilling type lock bolt device capable of securing a proper covering thickness of a solidification material.SOLUTION: In a lock bolt device for injecting-solidifying a solidification material between a hollow rod and a drilled hole by drilling a hole in the natural ground R by a bit by a rock drill connected to the other end of the hollow rod, the hollow rod is constituted of a tip rod 3 for connecting the bit 2 and the hollow rods 5 and 6 connected to the tip rod, and the respective hollow rods are provided with a cylindrical coupler 4 for forming a male screw part in its both end parts and forming a female screw part in both end parts, and the respective hollow rods are connected by the cylindrical coupler 4, and the cylindrical coupler 4 comprises a plurality of projection parts 13 of projecting in a radial shape on the outer periphery, and a clearance recessed part recessed in the cylinder center direction is provided between the respective projection parts, and is constituted so that a diameter T2 of a circle constituted of the projection parts 13 of the cylindrical coupler 4, becomes the same as a diameter T1 of a maximum diameter part of the bit 2.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-drilling lock bolt device that drives a rod while drilling a ground with a bit at the tip of the rod, and injects and fixes a solidified material, its lock bolt method, and a coupler used therefor It is.

  This type of self-drilling rock bolt device connects a hollow rod having a bit at the tip to a rock drill, for example, drills a natural ground with the bit while giving blow and rotation by the rock drill, The solidified material such as cement milk was injected into the hollow rod, and the solidified material was discharged from the tip of the bit into the hole, thereby fixing the periphery of the rod with the solidified material. In such a conventional structure, a center riser is connected in the middle of a hollow rod for centering, and a subsequent hollow rod is connected to the leading hollow rod with a coupler (Patent Document). 1).

JP 2007-107372 A JP 2005-120824 A

  By the way, in the apparatus of Patent Document 1, since the diameter of the center riser and the coupler is smaller than the diameter of the tip bit, there is a space between the inner wall of the drilled hole and the outer peripheral surface of the center riser and the coupler. As a result, a deviation occurs between the center of the drilled hole and the center axis of the hollow rod, and it is difficult to ensure a sufficient thickness of the cement milk.

  On the other hand, spacers have been developed to appropriately secure the cover thickness of the lock bolt (Patent Document 2, etc.). Since such a spacer is attached from the side to the middle part of the lock bolt, It cannot be used in a self-drilling type lock bolt device that drills while self-drilling with a bit.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a self-drilling lock bolt device capable of ensuring an appropriate covering thickness of the solidified material.

  It is another object of the present invention to provide a self-drilling lock bolt method capable of ensuring an appropriate covering pressure of a solidifying material such as cement milk.

  It is another object of the present invention to provide a self-drilling lock bolt device that can secure an appropriate covering pressure of a solidified material such as cement milk and a coupler that can be used in a construction method.

In order to achieve the above object, the present invention
First, a drilling bit having a diameter larger than the diameter of the hollow rod is connected to the tip of the hollow rod, and a ground drill is connected to the ground by the drilling bit connected to the other end of the hollow rod. In the lock bolt device constituted by drilling a mountain and putting a solidifying material between the hollow rod and the hole to be solidified, the hollow rod is a tip rod to which the hole bit is connected. And one or a plurality of connecting hollow rods connected to the tip rod, each hollow rod having a male screw portion formed at both ends thereof, and a cylinder having a female screw portion formed at both ends thereof. The hollow coupler is provided, and one hollow rod and the other hollow rod are connected by screwing the male screw portions of the hollow rods to the female screw portions of the cylindrical coupler, Cylindrical couplers project radially on the outer circumference A plurality of relief recesses provided in the direction of the center of the cylinder between the projections, and the diameter of the circle formed by the projections of the cylindrical coupler is The lock bolt device is characterized by being configured to have the same diameter as the maximum diameter portion of the drilling bit.

  One or a plurality of hollow rods for connection refer to, for example, an intermediate rod (5), a final rod (6), and the like. The cylindrical coupler can be constituted by, for example, a wheel coupler (4). The protrusion can be constituted by a chevron protrusion (13). With this configuration, the diameter of the circle formed by the protruding portion of the cylindrical coupler is the same as the diameter of the maximum diameter portion of the drilling bit. The diameter and the diameter of the circle formed by the protruding portion of the cylindrical coupler are substantially the same, so that the center axis of the hollow rod and the center axis of the drill hole can be substantially coincided with each other, and the solidified material can be formed over the entire hole hole. Appropriate covering pressure can be secured.

  Secondly, the protruding portion of the cylindrical coupler has a flat portion that is the maximum protruding portion at the center in the axial direction of the cylinder, and rises from both ends of the cylindrical coupler to the flat portion. It is comprised by the said rock bolt apparatus of the said 1st comprised by the inclined surface.

  With this configuration, when drilling by self-drilling the drill bit, the portion where the protruding portion of the cylindrical coupler comes into contact with the inner surface of the drill hole can be made flat only, thereby providing a cylindrical shape. The contact area between the protruding portion of the coupler and the inner surface of the hole can be reduced, and a smooth hole operation can be achieved.

  Third, a nut-like spacer is screwed to the other end of the hollow rod for connection on the side opposite to the drilling bit, which can be positioned near the exit of the drilling hole. A plurality of projecting portions projecting radially on the outer periphery, and a plurality of relief recesses provided in the direction of the center of the cylinder are provided between the projecting portions, and are configured by the projecting portions of the nut-shaped spacer. The diameter of the circle to be formed is configured to be the same as the diameter of the maximum diameter portion of the drilling bit, and is configured by the lock bolt device according to the first or second aspect.

  The nut-shaped spacer can be constituted by, for example, a wheel spacer (7). When configured in this way, even if there is a deviation between the center axis of the hole and the center axis of the hollow rod in the vicinity of the hole outlet of the hollow rod, by screwing a nut-like spacer to the hollow rod, In the vicinity of the hole exit, the hollow rod and the hole can be centered. Accordingly, it is possible to ensure an appropriate covering pressure of the solidified material over the entire hole hole including the vicinity of the outlet of the hole hole.

  Fourth, a drill bit is connected to the tip of the hollow rod and a rock drill connected to the other end of the hollow rod is used to drill the ground with the drill bit, and then the hollow rod and the drill bit are cut. A self-drilling type lock bolt construction method in which a solidifying material is injected between the hole and solidified to solidify, and the other end of the hollow rod protruding from the slope of the natural ground is fixed with a lock nut. The hollow rod has a male rod at both ends and a rod having a drill bit connected to the tip, and a male screw at both ends. It is composed of one or a plurality of connecting hollow rods to be connected, and each hollow rod is connected via a cylindrical coupler in which female screw portions are formed at both ends, and the cylindrical coupler is Has a plurality of protrusions protruding radially on its outer periphery. In addition, a plurality of relief recesses provided in the direction of the center of the cylinder are provided between the protrusions, and the diameter of the circle formed by the protrusions of the cylindrical coupler is determined by the drill bit. The diameter is the same as the diameter of the maximum diameter portion of the tip rod. With the female threaded portion at one end of the cylindrical coupler connected, and with the female threaded portion at the other end of the cylindrical coupler connected to the tip of the hollow rod for connection, the drilling bit again. Drill a ground to a certain depth, inject a solidifying material into each rod from the hollow rod on the slope side of the ground, and inject the solidified material from the tip of the drilling bit into the hole. The ejected solidified material is ejected through the plurality of relief recesses of the cylindrical coupler. By row, the solidifying material filled between the hollow rod and the drilling hole, then, constituted by a lock bolt method of self-drilling, characterized in that solidifying the solidifying material.

  One or a plurality of hollow rods for connection refer to, for example, an intermediate rod (5), a final rod (6), and the like. The cylindrical coupler can be constituted by, for example, a wheel coupler (4). The protrusion can be constituted by a chevron protrusion (13). According to such a construction method, the diameter of the circle formed by the protruding portion of the cylindrical coupler is the same as the diameter of the maximum diameter portion of the drilling bit. And the diameter of the circle formed by the protruding portion of the cylindrical coupler are substantially the same, so that the center axis of the hollow rod and the center axis of the drill hole can be substantially coincided with each other, and the solidified material over the entire hole hole. An appropriate covering pressure can be ensured.

  Fifth, the projecting portion of the cylindrical coupler has a flat portion that is the largest projecting portion at the center in the axial direction of the cylinder, and rises from both end edges of the cylindrical coupler to the flat portion. It is comprised by the said rock bolt construction method of the said 4 comprised by the inclined surface.

  According to such a construction method, when the hole is drilled by self-drilling of the drill bit, the part where the protruding portion of the cylindrical coupler comes into contact with the inner surface of the drill hole can be made flat only. The contact area between the protruding portion of the coupler and the inner surface of the hole can be reduced, and a smooth hole operation can be achieved.

  Sixth, a nut-like spacer having a plurality of projecting portions projecting radially on the outer periphery and having a plurality of relief recesses recessed in the center of the cylinder is provided between the projecting portions. The diameter of the circle formed by the projecting portion of the spacer is configured to be the same as the diameter of the maximum diameter portion of the drill bit, and after drilling the ground to a predetermined depth Before injecting the solidifying material, the nut-like spacer is screwed to the other end located near the hole exit of the hollow rod for connection on the side opposite to the hole for drilling. It is comprised by the rock bolt construction method of the said 4th or 5 to do.

  The nut-shaped spacer can be constituted by, for example, a wheel spacer (7). When configured in this way, even if there is a deviation between the center axis of the hole and the center axis of the hollow rod in the vicinity of the hole outlet of the hollow rod, by screwing a nut-like spacer to the hollow rod, In the vicinity of the hole exit, the hollow rod and the hole can be centered. Accordingly, it is possible to ensure an appropriate covering pressure of the solidified material over the entire hole hole including the vicinity of the outlet of the hole hole.

  Seventh, female screw portions are formed at both ends, and a male screw portion at the other end of one hollow rod and a male screw portion at one end of the other hollow rod are connected to the female screw portions at both ends. Thus, a cylindrical coupler for use in a self-drilling lock bolt device capable of connecting two hollow rods, wherein the cylindrical coupler has a plurality of projecting portions projecting radially on the outer periphery thereof, and A plurality of relief recesses that are recessed in the direction of the center of the cylinder are provided between the protrusions, and the diameter of the circle formed by the protrusions of the cylindrical coupler is connected to the tip of the hollow rod. It is comprised by the coupler characterized by being comprised so that it may become the same as the diameter of the largest diameter part of the bit for drilling.

  With this configuration, the diameter of the circle formed by the protruding portion of the cylindrical coupler is the same as the diameter of the maximum diameter portion of the drilling bit. The diameter and the diameter of the circle formed by the protruding portion of the cylindrical coupler are substantially the same, so that the center axis of the hollow rod and the center axis of the drill hole can be substantially coincided with each other, and the solidified material can be formed over the entire hole hole. Appropriate covering pressure can be secured.

  Eighth, the protruding portion of the cylindrical coupler has a flat portion serving as a maximum protruding portion at the center in the axial direction of the cylinder, and from both end edges of the cylindrical coupler to the flat portion. It is comprised by the coupler of said 7th comprised by the climbing inclined surface.

  According to such a configuration, when drilling by self-drilling the drill bit, the portion where the cylindrical coupler protrusion contacts the inner surface of the drill hole can be a flat portion only. It is possible to reduce the contact area between the protruding portion of the cylindrical coupler and the inner surface of the drilling hole, thereby enabling a smooth drilling operation.

  According to the present invention, the diameter of the hole formed by the drill bit and the diameter of the circle formed by the protruding portion of the cylindrical coupler are substantially the same, so that the center axis of the hollow rod and the center of the hole are The axes can be made substantially coincident, and an appropriate covering pressure of the solidified material can be ensured over the entire hole.

  Further, when drilling by self-drilling the drill bit, the portion where the projection of the cylindrical coupler comes into contact with the inner surface of the drill hole can be limited to the flat portion. The contact area of the inner surface of the hole can be reduced, and a smooth drilling operation can be achieved.

  Further, even if there is a deviation between the center axis of the hole and the center axis of the hollow rod in the vicinity of the hole hole outlet of the hollow rod, the nut hole spacer is screwed onto the hollow rod, so that the hole hole outlet is In the vicinity, the hollow rod and the hole can be centered. Accordingly, it is possible to ensure an appropriate covering pressure of the solidified material over the entire hole hole including the vicinity of the outlet of the hole hole.

It is side surface sectional drawing of the rock bolt apparatus which concerns on this invention. It is side surface sectional drawing of other embodiment of an apparatus same as the above. It is a perspective view of the wheel coupler used for an apparatus same as the above. (A) is a front view of a wheel coupler used in the same apparatus, (b) is a side view of the wheel coupler, and (c) is a cross-sectional view of the wheel coupler. It is a perspective view of the wheel spacer used for an apparatus same as the above. (A) is a front view of the wheel spacer used for an apparatus same as the above, (b) is a side view of the wheel spacer, and (c) is a sectional view of the wheel spacer. The procedure of the rock bolt construction method concerning this invention is shown, and sectional drawing of the state which self-drills a rock bolt in a natural ground is shown. (A) shows a state where a hole is drilled with a tip rod, (b) shows a state where a rock drill is removed, (c) shows a state where a wheel coupler is connected, and (d) shows a state where a hole has been finished with a final rod. . The procedure of the rock bolt construction method concerning this invention is shown, and sectional drawing of the state which self-drills a rock bolt in a natural ground is shown. (A) shows a state in which drilling with the final rod has been completed, (b) shows a preparation state in which cement milk is injected, and (c) shows a state in which cement milk is injected. The procedure of the rock bolt construction method concerning this invention is shown, and sectional drawing of the state which self-drills a rock bolt in a natural ground is shown. (A) is a state in which the spherical nut is attached, (b) is a state in which the cap is attached, and (c) is a state in which the cap is attached and the lock bolt device is completed. It is explanatory drawing which shows the relationship between a wheel coupler and a drilling hole.

  Hereinafter, the self-drilling type lock bolt device according to the present invention, its construction method, and the coupler used therefor will be described in detail.

First, a self-piercing lock bolt device will be described with reference to FIG.
This self-drilling lock bolt device 1 includes a hollow tip rod 3 having a drilled carbide bit 2 (hereinafter referred to as a bit 2) screwed to a tip portion, and between the tip rod 3 and the intermediate rod 5. The wheel coupler 4 (cylindrical coupler) 4 screwed in, the wheel coupler 4 screwed between the hollow intermediate rod 5 and the hollow final rod 6, and the final portion in the vicinity of the opening (mouth) in the hole 12. From the rear end portion (the other end portion) of the rod 6, the wheel spacer 7 screwed in the vicinity of the slope G, and the cap structure C attached to the projecting portion of the final rod 6 on the slope G It is configured.

  The rods 3, 5, and 6 are located in a drilling hole 12 that is self-drilled by the bit 2 from the slope G, and the diameter T 1 of the maximum diameter portion of the bit 2 and the maximum diameter portion of the wheel coupler 4. The diameter T2 of the wheel spacer 7 and the diameter T3 of the maximum diameter portion of the wheel spacer 7 are all the same (T1 = T2 = T3).

  Although the construction method will be described later, since the natural ground R is drilled by the bit 2, the diameter T4 of the drilling hole 12 is substantially the same as the diameter T1 of the bit 2, and therefore the maximum diameter of the wheel coupler 4 is increased. The portion (diameter T2) is in contact with the inner surface of the drilling hole 12, the maximum diameter portion (diameter T3) of the wheel spacer 7 is in contact with the inner surface of the drilling hole 12, and the center of each rod 3, 5, 6 The axis P is configured such that the center axis of the bit 2 and the wheel coupler 4 and the wheel spacer 7 coincide with each other, and the center axis of the hole 12 and the center axis P substantially coincide with each other.

  A solidified material (for example, cement milk) is injected into the hollow space of the rod from the rear end (the other end) of the final rod 6 into the hole 12. The rock bolt device shown in FIG. 1 can be configured by jetting into the hole 12 and causing the inside of the hole 12 to flow backward in the mouth direction so that the hole 12 is filled with cement milk and cured. .

  2 is also a self-drilling lock bolt device 1 in which a tip rod 3 and a long final rod 6 are connected by a single wheel coupler 4. As described above, the number of rods used and the number of wheel couplers 4 used are arbitrary, and can be used in an optimum structure according to the conditions at the site.

Next, the wheel coupler 4 will be described with reference to FIGS.
The wheel coupler 4 as a whole is composed of a substantially cylindrical main body 4 ′ having a central axis P as a central axis, and female screw holes 4 a and 4 a are formed through the central axis P in the longitudinal direction. By screwing the rod into the female screw holes 4a, 4a, for example, the tip rod 3 and the intermediate rod 5 are connected with the central axis P as the common central axis. In addition, a central hole portion 4b that is not threaded is formed in the central portion of the coupler 4 between the inner portions of the female screw holes 4a and 4a.

  As shown in FIG. 4A, the wheel coupler 4 has an angular difference of 90 degrees in the circumferential direction on the outer periphery, the same distance T5 in the radial direction from the central axis P, and Four chevron protrusions (projections) 13, 13, 13, 13 having the same shape are formed, and four relief recesses 14, 14, 14, 14 are provided between the two chevron protrusions 13, 13. Is formed. That is, a plurality of (four) projecting portions 13, 13, 13, 13 projecting radially are formed on the outer periphery thereof.

  4A. As shown in FIG. 4B, the chevron protruding portion 13 is inclined surfaces (rising inclined surfaces) 13a and 13a that rise linearly from the both ends toward the central dividing line M at the same angle as shown in FIG. A flat portion 13b having a length T6 in the longitudinal direction is formed in the central portion. The inclined surfaces 13a and 13a have two adjacent points (for example, q1 and q2) of four points (q1, q2, q3, q4) having an opening angle of 90 degrees in the circumferential direction at the circular ends 4 ″, 4 ″ at both ends. ) And projecting in the outer peripheral direction, and gradually reaching the flat portion 13b of the maximum diameter portion while gradually reducing its width (circumferential width).

  Further, the inclined surface 13a and the flat surface 13b of the mountain-shaped protruding portion 13 each form an arc surface that curves in the circumferential direction when viewed in the circumferential direction (see FIG. 4A).

  The shape of the four recesses 14, 14, 14, 14 is an arcuate recess shape on the inner side (in the direction of the central axis P) in a front view (see FIG. 4A), but as shown in FIG. When viewed in the longitudinal direction, starting from the point q1 (or q2, q3, q4) of one end portion 4 ″, while forming a concave surface, the width in the circumferential direction is expanded to the central portion, and the flat portion 13b. The width in the circumferential direction is reduced from the central portion 14a until the central portion 14a of the same circumference reaches the point q1 (or q2, q3, q4) in the same circumferential direction corresponding to the other end 4 ″. However, it has a shape that converges to the point q1, that is, a symmetrical shape with respect to the dividing line M at the center.

  That is, the wheel coupler 4 as a whole has a bilaterally symmetric shape with the center bisecting line M as the center.

  The diameter T2 of the flat portion 13b of the chevron projecting portion 13, which is the maximum diameter portion of the wheel coupler 4, that is, the circle Y formed by the chevron projecting portion 13 (see FIG. 10, the outer peripheral surface of the chevron projecting portion 13 is Since the diameter T2 of the circle Y) formed by tying is the same as the diameter T1 of the bit 2, the flat portions 13b of the four protrusions 13, 13, 13, 13 are formed on the inner surface of the drilling hole 12. Drilling is performed in a state where 13b, 13b, and 13b are in contact. Therefore, even during excavation, the central axis P of the rods 3, 5, and 6 and the central axis P of the excavation hole 12 substantially coincide with each other, and the rod can be centered with respect to the drilling hole 12. Further, since the longitudinal distance T6 of the flat portion 13b is short, the contact resistance between the wheel coupler 4 and the inner surface of the hole 12 can be reduced as much as possible at the time of drilling, thereby realizing a smooth hole drilling operation. be able to.

  Further, when drilling is performed using the wheel coupler 4, four spaces S ′ are formed between the inner surface of the drill hole 12 and the relief recesses 14, 14, 14, and 14 of the wheel coupler 4 (see FIG. 10), and a solidifying material such as cement milk can be introduced smoothly.

Next, the wheel spacer (nut-shaped spacer) 7 will be described with reference to FIGS.
The wheel spacer 7 as a whole is composed of a substantially cylindrical main body 7 ′ centered on the central axis P, and a female screw hole 7 a is formed through the central axis P about the central axis P. The final rod For example, the final spacer 6 and the hole 12 are centered by screwing the wheel spacer 7 to the tip of the screw 6.

  The wheel spacer 7 protrudes from the central axis P at the same distance T5 in the radial direction with an angular difference of 90 degrees in the circumferential direction on the outer periphery, and has four chevron protrusions (protrusions) 15 having the same shape. 15, 15, 15 are formed, and four relief recesses 16, 16, 16, 16 are formed between the mountain-shaped protrusions 15, 15.

  When viewed from the side, the chevron protrusion 15 has inclined surfaces 15a and 15a that rise linearly at the same angle from both end portions 7 ″ toward the center dividing line M, as shown in FIG. 6B. A flat portion 15b having an axial length T7 is formed in the central portion.The inclined surfaces 15a and 15a have an opening angle of 90 degrees in the circumferential direction at the circular end portions 7 ″ and 7 ″. Starting from any one of the four points (q1, q2, q3, q4) (for example, q1 and q2), the flatness of the maximum diameter portion is projected while projecting in the outer circumferential direction and gradually narrowing the width (width in the circumferential direction). It reaches part 15b.

  Further, the inclined surface 15a and the flat surface 15b of the mountain-shaped projecting portion 15 form an arc surface that is curved in the circumferential direction when viewed in the circumferential direction (see FIG. 6A).

  The four relief recesses 16, 16, 16, and 16 are arcuate recesses on the inner side (in the direction of the central axis P) when viewed from the front (see FIG. 6A), but as shown in FIG. When viewed from the side, it starts from the point q1 (or q2, q3, q4) at one end, and the width in the circumferential direction is enlarged to the center, forming a concave surface, and the same as the flat portion 15b. The circumferential width is reduced from the central portion 16a until it reaches the central portion 16a of the circumference and reaches the point q1 (or q2, q3, q4) in the same circumferential direction corresponding to the other end 7 ″. However, the shape converges to the point q1, that is, a symmetrical shape with respect to the dividing line M at the center.

  The wheel spacer 7 as a whole has a bilaterally symmetrical shape with the center bisecting line M as the center.

  Since the diameter T3 of the maximum diameter portion of the wheel spacer 7 is the same as the diameter T1 of the bit 2, the flat portion 15b is in contact with the inner surface of the drilling hole 12. Therefore, the rods 3, 5 and 6 can be centered with respect to the hole 12 near the mouth of the rod. Further, since the longitudinal distance T7 of the flat portion 15b is short, the contact resistance between the wheel spacer 7 and the inner surface of the hole 12 can be minimized.

Next, a self-piercing type lock bolt method using the above lock bolt device will be described.
7 to 9, the lock bolts 3, 5, and 6 are drawn horizontally. Actually, the ground surface (horizontal plane) is the ground surface G 'shown in FIG. The surface G stands up from the ground surface G ′ by θ degrees, and a lock bolt is inserted and fixed to the slope G of the natural ground R.

  First, the female screw portion of the bit 2 is screwed to the male screw portion 3a at the tip of the tip rod 3 formed with the male screw portions 3a and 3b at both ends, and the rock drilling is performed on the male screw portion 3b at the other end of the tip rod 3. The swivel shank adapter 17a at the tip of the machine 17 is screwed, the tip of the bit 2 is brought into contact with the slope G of the natural ground R, and the rock drill 17 is driven to strike and rotate the bit 2. Drilling is performed in a direction perpendicular to the surface G (FIGS. 1A and 1B).

  Then, the male screw portion 3b at the other end of the tip rod 3 is drilled to a depth that slightly protrudes from the drill hole 12, that is, approximately the length of the tip rod 3 (about 1 m), and the shank adapter 17a is It removes from the external thread part 3b of the other end of the tip rod 3 (refer FIG.7 (b)).

  Next, the shank adapter 17a of the rock drill 17 is screwed into the male screw portion 5b at the other end of the intermediate rod 5, and one of the wheel couplers 4 is fitted into the male screw portion 3b at the other end of the tip rod 3. The female screw portion 4a is screwed (see FIG. 7C).

  Thereafter, the male screw portion 5 a at the tip of the intermediate rod 5 is screwed to the other female screw portion 4 a of the wheel coupler 4 attached to the tip rod 3. In this case, the male screw portion 5 a can be screwed to the wheel coupler 4 by rotating the rock drill 17 and rotating the intermediate rod 5.

  Thereafter, the rock drill 17 is driven to drill a hole approximately the length of the intermediate rod 5 (about 1 m) until the male screw portion 5b at the other end of the intermediate rod 5 slightly protrudes from the drill hole 12 ( 7 (d), the shank adapter 17a is removed from the male screw hole 5b at the other end of the intermediate rod 5 (see FIG. 7 (d)).

  In the drilling operation, the wheel coupler 4 also rotates while the wheel 2 rotates in the hole drilled by the bit 2. The diameter T2 of the maximum diameter portion of the wheel coupler 4 is the maximum diameter portion of the bit 2. Is equal to the diameter T1 (T1 = T2), so that the outer peripheral surface of the mountain-shaped protrusion 13 of the wheel coupler 4, that is, the four flat portions 13b, 13b, 13b, and 13b are in contact with the inner surface of the hole 12 and thereby The center axis P of the tip rod 3 and the intermediate rod 5 and the center axis of the hole 12 are substantially coincident, that is, the center axis P of the rods 3 and 5 and the center axis of the hole 12 are substantially coincident, Drilling can be performed with the rods 3 and 5 positioned at the center of the hole, that is, with the rod and the hole 12 centered.

  The shank adapter 17a of the rock drill 17 is screwed to the male screw portion 6b at the other end of the final rod 6, and the second wheel coupler 4 is connected to the male screw portion 5b at the other end of the intermediate rod 5. The female screw part 4a on one side is screwed (see FIG. 7D).

  Thereafter, the male screw portion 6 a at the tip of the final rod 6 is screwed to the other female screw portion 4 a of the wheel coupler 4 attached to the intermediate rod 5. In this case, the rock drill 17 can be rotated to rotate the final rod 6 so that the coupler 4 can be easily screwed.

  Then, by driving the rock drill 17 and striking and rotating the bit 2 through each rod (see FIG. 7D), the position where the other end of the final rod 6 protrudes from the slope G by a distance t. (See FIGS. 7 (d) and 8 (a)) (excavation distance of about 1 m), and remove the shank adapter 17a from the other end of the final rod 6 (see FIG. 8 (a)). At this time, the portion protruding (protruding) from the mouth (position of the slope G) of the hole 12 of the final rod 6 is referred to as a protruding portion 6c (see FIG. 8A).

  In the drilling operation with the final rod 6 attached, the two wheel couplers 4 and 4 are rotated while the two wheel couplers 4 and 4 are rotating in the hole drilled by the bit 2 as described above. Since the diameters T2 and T2 of the maximum diameter portions of the couplers 4 and 4 are the same as the diameter T1 of the maximum diameter portion of the bit 2 (T1 = T2), the outer peripheral surface of the angle protrusion 13 of the wheel couplers 4 and 4, that is, The four flat portions 13b, 13b, 13b, and 13b are in contact with the inner surface of the hole 12 so that the central axis P of the tip rod 3, the intermediate rod 5, and the final rod 6 is substantially equal to the central axis of the hole 12. That is, the center axis P of each of the rods 3, 5 and 6 and the center axis of the hole 12 are substantially coincident, and the rods 3, 5 and 6 are positioned at the center of the hole 12; Drilling with the hole 12 centered Can.

  Thereafter, the wheel spacer 7 is screwed to the projecting portion 6c and rotated so that the wheel spacer 7 is screwed to the final rod 6, and the position slightly entered into the excavation hole 12 from the slope G, That is, the wheel spacer 7 is screwed in until the surface on the projecting portion 6c side substantially coincides with the slope G (see FIG. 8A).

  At this time, since the diameter T3 of the maximum diameter portion of the wheel spacer 7 is the same as the diameter T1 of the bit 2 and the maximum diameter portion T2 of the wheel coupler 4, the protruding portion forming the maximum diameter portion of the wheel spacer 7 is used. The outer surfaces of 15, 15, 15, and 15 come into contact with the inner surface of the hole hole 12, whereby each rod and the hole hole 12 can be centered. That is, in the vicinity of the other end 6b of the final rod 6, even if there is a deviation between the center axis P of the final rod 6 and the center of the drilled hole 12, the wheel spacer 7 is screwed into the final rod 6, By screwing the protrusions 15, 15, 15, 15 to the position where they contact the inner surface of the hole 12, the central axis P of the final rod 6 and the center axis of the hole 12 can be made coincident with each other near the mouth. As a whole, the holes 3, 12 can be centered with the rods 3, 5, 6 and the hole 12.

  Next, the female screw portion 18a at the tip of the cement milk injection adapter 18 is screwed to the protruding portion 6c of the final rod 6, and the cement milk injection hose 20 is connected to the adapter 18 via the lever coupling 19. (See FIG. 8B).

  Thereafter, cement milk as a solidifying material is injected from the hose 20 into the hollow holes of the rods 3, 5 and 6 (see FIG. 8C). The injected cement milk reaches the bit 2 through the hollow holes of the rods 6, 5, 3, and is ejected into the drilling hole 12 from the tip opening for the cement milk ejection of the bit 2. Cement milk ejected from the opening of the tip of the bit 2 travels backward through the hole 12 and passes through the space between the outer peripheral surface of the rods 3, 5, 6 and the inner peripheral surface of the hole 12, and the slope G (mouth) The space S between the outer peripheral surface of the rods 3, 5, 6 and the inner peripheral surface of the hole 12 is filled while reversing the direction of the hole 12 in the direction. Cement milk (solidified material) filled in the hole 12 is indicated by reference numeral 21).

  At this time, at the position of the wheel couplers 4 and 4, the cement milk rises through the spaces S ′ of the four recesses 14, 14, 14 and 14 of the wheel couplers 4 and 4. Even if the outer surfaces 13b of the four projecting portions 13 of the couplers 4 and 4 are in contact with the inner surface of the hole hole 12, the cement milk can smoothly rise (reverse) in the hole hole 12 without any trouble. . In addition, as shown in FIG.8 (c), a part of cement milk permeate | transmits in the natural ground R from the inner wall of the drilling hole 12 (refer the infiltration part K of FIG.8 (c)).

  Here, the operator confirms that the cement milk 21 has reached the vicinity of the opening (mouth) of the hole 12 and ends the cement milk injection operation. Thereafter, the kneaded mortar 22 is injected in the vicinity of the opening (mouth) of the hole 12 (for example, about 500 mm from the slope G), and the cement milk 21 and the slope G are formed at the opening (mouth) of the hole 12. Fill in the gaps between them.

  Then, for example, after about 1 hour has elapsed, after the injected cement milk 21 has hardened, the cap structure C is installed on the protrusion 6c. That is, the center opening of the plate 8 is inserted into the protruding portion 6c, the plate 8 is mounted on the slope G (see FIG. 9A), and the screw spherical washer 9 is mounted on the protruding surface 6c. The spherical nut (lock nut) 10 is screwed into the projecting portion 6 and the spherical nut 10 is received by the spherical washer 9 after being inserted through the protruding portion 6c and installed on the plate 8. Fully tighten (see FIG. 9A).

  Next, an aluminum cap 11 is attached to the protruding portion 6c, and the lower portion of the aluminum cap 11 is fixed on the plate 8 with bolts B. The aluminum cap 11 is filled with a rust preventive agent 23 in advance. The operator confirms the filling of the rust preventive agent by confirming that the rust preventive agent 23 leaks from the opening at the tip of the aluminum cap 11, and closes the opening with the bolt 11a (FIG. 9B). ), See FIG. 9C).

  As described above, according to the present invention, the diameter of the drilled hole 12 drilled by the excavating bit 2 and the diameter of the circle formed by the protruding portion 13 of the cylindrical coupler 4 are substantially the same. The center axis P of the rod and the center axis of the hole hole 12 can be made to substantially coincide with each other, and the appropriate covering pressure (for example, 10 mm or more on one side) of the solidified material can be ensured over the entire hole hole 12 (hollow rod, coupler, The spacer can be positioned at the center of the hole.

  Further, when drilling by self-drilling the bit 2 for drilling, the portion where the protruding portion 13 of the cylindrical coupler 4 contacts the inner surface of the drilling hole 12 can be made only the flat portion 13b. The contact area between the protrusion 13 of the cylindrical coupler 4 and the inner surface of the hole 12 can be reduced, and a smooth hole drilling operation can be performed.

  Further, even if there is a deviation between the center axis of the hole 12 and the center axis P of the hollow rod in the vicinity of the hole outlet of the hollow rod, the nut-shaped spacer 7 is screwed onto the hollow rod to The hollow rod and the hole 12 can be centered near the hole outlet. Thereby, it is possible to ensure an appropriate covering pressure of the solidified material over the entire hole hole 12 including the vicinity of the outlet of the hole hole 12.

  The lock bolt device according to the present invention, the construction method thereof, and the coupler used therefor can be widely used as a self-drilling lock bolt device and a lock bolt construction method.

1 Rock bolt device 2 Drilling bit 3 Tip rod (hollow rod)
3a, 3b Male screw part 4 Wheel coupler (cylindrical coupler)
4a Female screw part 5 Intermediate rod (hollow rod for connection)
5a, 5b Male screw part 6 Final rod (hollow rod for connection)
6a, 6b Male screw part 7 Wheel spacer (nut-shaped spacer)
10 Spherical nut (lock nut)
12 Drilling hole 13 Angle protrusion (protrusion)
13a Uphill inclined surface 13b Flat part 14 Relief recess 15 Angle protrusion (protrusion)
16 Recessed recess 21 Cement milk (solidified material)
T1 diameter (bit)
T2 diameter (coupler)
T3 diameter (spacer)
R Chiyama

Claims (8)

A drill bit having a diameter larger than the diameter of the hollow rod is connected to the tip of the hollow rod, and a ground is drilled by the drill bit using a rock drill connected to the other end of the hollow rod. In a lock bolt device configured by solidifying by introducing a solidifying material between the hollow rod and the hole,
The hollow rod is constituted by a tip rod to which the drilling bit is connected and one or a plurality of connecting hollow rods connected to the tip rod, and each hollow rod has male screw portions at both ends thereof. Formed,
Cylindrical couplers with female screw portions formed at both ends are provided, and one hollow rod and the other hollow rod are screwed into the female screw portions of the cylindrical coupler with the male screw portions of the hollow rods. Are connected by
The cylindrical coupler has a plurality of projecting portions projecting radially on the outer periphery thereof, and a plurality of relief recesses that are recessed in the center of the cylinder are provided between the projecting portions.
The lock bolt device according to claim 1, wherein a diameter of a circle formed by the protruding portion of the cylindrical coupler is the same as a diameter of a maximum diameter portion of the drill bit.   The protruding portion of the cylindrical coupler has a flat portion that becomes the maximum protruding portion at the center in the axial direction of the cylinder, and is constituted by a sloped inclined surface from both ends of the cylindrical coupler to the flat portion. The lock bolt device according to claim 1. A nut-like spacer is screwed to the other end that can be located in the vicinity of the hole outlet of the hollow rod for connection on the side opposite to the hole for drilling,
The nut-shaped spacer has a plurality of projecting portions projecting radially on the outer periphery thereof, and a plurality of relief recesses recessed in the center of the cylinder are provided between the projecting portions.
3. The diameter of the circle formed by the protruding portion of the nut-like spacer is configured to be the same as the diameter of the maximum diameter portion of the drilling bit. The lock bolt apparatus of description. A drill bit is connected to the end of the hollow rod, and a rock drill connected to the other end of the hollow rod is used to drill the ground with the drill bit, and then between the hollow rod and the drill hole. In the self-drilling lock bolt construction method, which is solidified by injecting a solidifying material into, and fixing the other end of the hollow rod protruding from the slope of the natural ground with a lock nut,
The hollow rod is formed with a male rod at both ends and a male rod at both ends, and a male screw at both ends, and is connected to the rod. One or more hollow rods for connection,
Each of the hollow rods is connected via a cylindrical coupler having female screw portions formed at both ends,
The cylindrical coupler has a plurality of protrusions protruding radially on the outer periphery thereof, and a plurality of relief recesses provided in the direction of the center of the cylinder are provided between the protrusions.
The diameter of the circle formed by the protruding portion of the cylindrical coupler is configured to be the same as the diameter of the maximum diameter portion of the drill bit,
After drilling the natural ground at a certain depth with the drill bit of the tip rod,
The female screw portion at one end of the cylindrical coupler is connected to the male screw portion at the other end of the tip rod, and the tip of the connecting hollow rod is connected to the female screw portion at the other end of the cylindrical coupler. In this state, drill the natural ground to a certain depth again with the drilling bit,
The solidified material is injected into each rod from the hollow rod on the slope side of the natural ground, the injected solidified material is ejected from the tip of the drilling bit into the drilled hole, and the ejected solidified material is injected into the cylinder. A self-drilling lock characterized in that the solidified material is filled between the hollow rod and the drilled hole by reversing through the plurality of relief recesses of the cylindrical coupler, and then the solidified material is solidified. Bolt method.   The protruding portion of the cylindrical coupler has a flat portion that becomes the maximum protruding portion at the center in the axial direction of the cylinder, and is constituted by a sloped inclined surface from both ends of the cylindrical coupler to the flat portion. The rock bolt construction method according to claim 4. A plurality of projecting portions projecting radially on the outer periphery, and a nut-like spacer provided with a plurality of relief recesses recessed in the center of the cylinder between the projecting portions,
The diameter of the circle formed by the protruding portion of the nut-shaped spacer is configured to be the same as the diameter of the maximum diameter portion of the drill bit,
After drilling the natural ground to a predetermined depth, before injecting the solidified material, the other end located near the drilling hole outlet of the connecting hollow rod on the side opposite to the drilling bit 6. The lock bolt method according to claim 4, wherein a nut-like spacer is screwed. A female screw portion is formed at both ends, and the male screw portion at the other end of one hollow rod and the male screw portion at one end of the other hollow rod are connected to the female screw portions at both the end portions. A cylindrical coupler used in a self-drilling lock bolt device capable of connecting a hollow rod of
The cylindrical coupler has a plurality of protrusions protruding radially on the outer periphery thereof, and a plurality of relief recesses provided in the direction of the center of the cylinder are provided between the protrusions.
The diameter of the circle formed by the protruding portion of the cylindrical coupler is configured to be the same as the diameter of the maximum diameter portion of the drill bit connected to the tip of the hollow rod. Coupler.   The protruding portion of the cylindrical coupler has a flat portion that becomes the maximum protruding portion at the center in the axial direction of the cylinder, and is constituted by a sloped inclined surface from both ends of the cylindrical coupler to the flat portion. The coupler according to claim 7.

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