JP2015127485A - Anchor bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor bolt capable of suppressing the backlash of a member attached thereto, etc. due to vibration.SOLUTION: An anchor bolt 1 includes a tapered member 8 connected to a bolt body 5, and an unfolded member 9 externally fitted to the tapered member 8. On the peripheral side face of the tapered member 8, a planarly shaped inclined surface 10 is formed, and on an abutment part 12 of the unfolded member 9, a planarly shaped inner surface 14 is provided which has face contact with the inclined surface 10. On the inner surface 14 of the abutment part 12, an engaging protruded portion 18 is protruded, and in the inclined surface 10 of the tapered member 8, an engaged recessed portion 19 is recessed with which the engaging protruded portion 18 engages. A side face 18b of the engaging protruded portion 18 and a side face 19b of the engaged recessed portion 19 face each other in the state that they come close to each other.

Description

  The present invention relates to an anchor bolt that is fixed to a hole provided in a wall surface such as a rock wall, a concrete ceiling, or a floor surface.

  For example, as shown in Patent Document 1, there is known a technique in which a hole is drilled in a concrete ceiling or floor using a drill or the like, and an anchor bolt is inserted and fixed in the hole.

  In the anchor bolt of Patent Document 1, as shown in FIG. 1 of Patent Document 1, a frustoconical taper member whose outer peripheral surface moves away from the central axis of the anchor bolt toward the lower end, and an outer peripheral surface of the taper member. It has a plurality of sliding pieces (expanding members) having curved inner surfaces that abut, and a reinforcing bar provided with a male screw that is screwed onto the female screw of the taper member.

  Then, by rotating the rebar, the taper member is raised by the screw action, and the outer peripheral surface of the taper member presses the inner surface of each sliding piece. Thereby, the outer peripheral surface of each sliding piece is pressed against the inner peripheral surface of the hole, and the anchor bolt is held (fixed) in the hole.

  Moreover, in the anchor bolt of patent document 1, several guide strips are protrudingly provided in the outer peripheral surface of the taper member at predetermined intervals, and each guide strip is located between the sliding pieces (patent document 1). FIG. 2). Thereby, even if the taper member tries to follow the rotation of the reinforcing bar, the guide strip hits the sliding piece, the rotation of the taper member is suppressed, and the taper member can be reliably raised.

  However, in the anchor bolt of Patent Document 1, as shown in FIG. 2 of Patent Document 1, the outer peripheral surface of the taper member and the inner surface of each sliding piece are curved in an arc shape, and the sliding pieces are spaced apart from each other. On the other hand, the width of the guide strip is narrow, and the taper member can easily rotate in either the direction of loosening or the direction of tightening due to vibration or the like. As a result, there is a risk that the members and equipment attached to the anchor bolts will rattle. As a countermeasure, for example, it is conceivable to increase the width of the guide strip and reduce the gap between the guide strip and the sliding piece.

Japanese Utility Model Publication No. 48-50760

  In the anchor bolt of Patent Document 1, when the taper member is raised in order to fix the anchor bolt in the hole, each sliding piece moves outward in the radial direction of the taper member. The interval between them will increase. Therefore, even if the width of the guide strip is increased as described above, it is not possible to prevent the taper member from rotating, and it is possible to reliably prevent the member attached to the anchor bolt from rattling due to vibration or the like. It will not be possible.

  The present invention has been provided for the purpose of solving such inconveniences, and it is an object of the present invention to provide an anchor bolt that can reliably prevent rattling of the members attached to the anchor bolt due to vibration or the like. .

  In order to solve such inconveniences, the present invention is an anchor bolt 1 which is inserted into a hole 3 provided in a wall surface 2 from the front end side and is fixed, and is a cylindrical taper member connected to a columnar bolt body 5 8 and an expanding member 9 that is externally fitted to the taper member 8, so that the peripheral side surface of the taper member 8 approaches the central axis of the taper member 8 toward the proximal end side of the taper member 8. An inclined flat surface 10 that is inclined is formed, the expanding member 9 has a contact portion 12, and the contact portion 12 can be brought into surface contact with the inclined surface 10 of the taper member 8. A flat inner surface 14 is provided, and the outer peripheral surface 15 of the contact portion 12 is in the inner periphery of the hole 3 while the inner surface 14 of the contact portion 12 is in surface contact with the inclined surface 10 of the taper member 8. Surface contact with the surface 16 is possible, and the inclined surface of the taper member 8 0 and the inner surface 14 of the abutting portion 12 are provided with an engaging convex portion 18 on at least one side and an engaging concave portion 19 for engaging the engaging convex portion 18 on the other side. The engagement convex portion 18 and the engagement concave portion 19 are maintained in an engaged state even when the taper member 8 is moved relative to the contact portion 12 in the axial direction. The side surface 18b of 18 and the side surface 19b of the engagement recessed part 19 face in the state which mutually adjoined.

  The wall surface 2 here includes civil engineering structures such as rock walls and tunnels, and wall surfaces such as ceilings and side walls of buildings. The shape of the bolt body 5 corresponds to a cylindrical shape, a quadrangular prism shape, or the like. The bolt body 5 and the taper member 8 are connected by forming a male screw 4 on the outer peripheral surface of the bolt main body 5 and forming a female screw 7 on the taper member 8 and screwing the male screw 4 of the bolt main body 5 to the female screw 7. Alternatively, the bolt main body 5 and the taper member 8 may be connected by integrally forming them, or the bolt main body 5 and the taper member 8 may be connected by welding the bolt main body 5 to the taper member 8 or the like. May be.

  The taper member 8 is disposed at the tip of the bolt body 5 or at an intermediate position in the length direction of the bolt body 5. It is preferable that the inclined surface 10 of the taper member 8 and the inner surface 14 of the contact portion 12 of the expanding member 9 are inclined at the same angle. Only a part of the outer peripheral surface 15 of the contact portion 12 may be in surface contact with the inner peripheral surface 16 of the hole 3. Only a part of the inclined surface 10 of the taper member 8 and the inner surface 14 of the contact portion 12 may be in surface contact.

  Here, for example, when the engaging concave portion 19 is provided in the inclined surface 10 of the taper member 8, the engaging convex portion 18 is provided correspondingly to the inner surface 14 of the contact portion 12, and the taper member. When the engaging convex portion 18 is provided on the eight inclined surfaces 10, the engaging concave portion 19 is provided on the inner surface 14 of the contact portion 12 correspondingly. The engaging convex portion 18 and the engaging concave portion 19 may be provided on the inclined surface 10 of the taper member 8, and the engaging convex portion 18 and the engaging concave portion 19 may be provided on the inner surface 14 of the contact portion 12 correspondingly. . The engaging convex part 18 and the engaging concave part 19 are provided in the middle of the width direction of the inclined surface 10 of the taper member 8 and the inner surface 14 of the contact part 12, the edge, or the like.

  Here, in order to maintain the engagement state between the engagement convex portion 18 and the engagement concave portion 19 even when the taper member 8 is moved relative to the contact portion 12 in the axial direction, the engagement convex portion 18 and the engagement convex portion 18 are engaged. The case where the joint recess 19 is extended from the tip end of the taper member 8 or the contact portion 12 to the base end is applicable. If the engagement state between the engagement convex portion 18 and the engagement concave portion 19 can be maintained, for example, the engagement convex portion 18 and the engagement concave portion 19 are connected from the tip of the taper member 8 or the contact portion 12 to the base end. It does not have to be extended until halfway.

  The side surface 18b of the engaging convex portion 18 and the side surface 19b of the engaging concave portion 19 include a case where they are close to each other with a slight gap and a case where they are close to each other with almost no gap. This includes the case of facing in a state shifted in the surface direction. The engagement protrusion 18 may have a rectangular cross section, or may have a circular arc shape or a triangular shape. The engagement recess 19 is formed in accordance with the shape of the engagement protrusion 18. When the engaging convex portion 18 and the engaging concave portion 19 have, for example, a circular arc shape in cross section, the side surface 18b of the engaging convex portion 18 and the side surface 19b of the engaging concave portion 19 correspond to the inclined surface 10 of the tapered member 8 or the contact surface. This corresponds to a portion that is substantially perpendicular to the inner surface 14 of the contact portion 12.

  A plurality of inclined surfaces 10 of the taper member 8 and a plurality of contact portions 12 facing the inclined surface 10 are provided, and the tip end sides of the contact portions 12 are connected by the bridging portions 13, and the holes 3 are connected. In the free state before insertion, the expanding member 9 is formed so as to move away from the taper member 8 as the contact portion 12 moves toward the free end side, and even in the free state before insertion into the hole 3. The engagement state between the mating projection 18 and the engagement recess 19 is maintained, and when the anchor bolt 1 is inserted into the hole 3, the outer peripheral surface 15 of the contact portion 12 is the hole 3. It is possible to be pressed against the inner peripheral surface 16. Here, the case where each contact portion 12 and the bridging portion 13 are integrally formed and connected, and the case where each contact portion 12 and the bridging portion 13 are separately formed and then connected by welding, screws, or the like are included. It is. The bridge | crosslinking part 13 includes the case where what was divided | segmented and formed and integrated by welding, a screw, etc. is included. In addition, here, for example, the case where only the free end side of the contact portion 12 is pressed against the inner peripheral surface 16 of the hole 3 is also included.

  A plurality of inclined surfaces 10 of the taper member 8 and a plurality of contact portions 12 facing the inclined surface 10 are provided, and the tip ends of the contact portions 12 are connected by the bridging portions 13. Among the plurality of inclined surfaces 10 and the plurality of contact portions 12, one or more inclined surfaces 10 of the taper member 8 and the number of the inclined surfaces 10 of the taper member 8 smaller than the number of the inclined surfaces 10 and the contact portions 12 are contacted. An engagement convex portion 18 and an engagement concave portion 19 that engages the engagement convex portion 18 may be provided on the inner surface 14 of the contact portion 12.

  Further, a reinforcing material 26 may be provided on the bridging portion 13.

  When the anchor bolt 1 of the present invention is inserted into the hole 3 of the wall surface 2 from the front end side and the taper member 8 is moved together with the bolt body 5 to the opening side (base end side) of the hole 3, the inclined surface of the taper member 8 is obtained. 10 moves to the opening side of the hole 3 while being in surface contact with the inner surface 14 of the contact portion 12 of the expanding member 9, thereby pushing the contact portion 12 toward the inner peripheral surface 16 side of the hole 3. Then, the outer peripheral surface 15 of the contact portion 12 is pressed against the inner peripheral surface 16 of the hole 3 in a surface contact state, and friction between the outer peripheral surface 15 of the contact portion 12 and the inner peripheral surface 16 of the hole 3 is caused by friction between the surfaces. Anchor bolt 1 is fixed (held) in hole 3.

  When the bolt main body 5 vibrates (moves) in the rotational direction (direction around the shaft) or the lateral direction (horizontal direction) due to an external cause or the like in the fixed (held) state, the taper member 8 is accordingly accompanied. Tries to vibrate (move) in the rotational direction or the lateral direction. At that time, the planar inner surface 14 of the contact portion 12 is in surface contact with the planar inclined surface 10 of the taper member 8, and the side surface 18 b of the engaging convex portion 18 and the side surface 19 b of the engaging concave portion 19 are in contact. Are in close proximity to each other and quickly come into contact with each other, and the contact portion 12 fixed to the hole 3 firmly suppresses the taper member 8 from moving in the rotational direction or the lateral direction. Thereby, shakiness of the member etc. attached to the above-mentioned bolt main body 5 is suppressed reliably.

  Since the engagement convex portion 18 and the engagement concave portion 19 are provided on the planar inner surface 14 of the contact portion 12, for example, a plurality of the engagement convex portions 18 and the engagement concave portions 19 are provided by moving the taper member 8 toward the opening side of the hole 3. Even if the interval between the contact portions 12 increases, the gap between the side surface 18b of the engagement convex portion 18 and the side surface 19b of the engagement concave portion 19 does not increase. Therefore, even if the taper member 8 is moved to the opening side of the hole 3, the side surface 18b of the engagement convex portion 18 and the side surface 19b of the engagement concave portion 19 can be brought into contact with each other quickly, and the taper member 8 is rotated in the rotational direction. And lateral movement are firmly suppressed. Further, the engagement between the engagement convex portion 18 and the engagement concave portion 19 allows the taper member 8 to be kept in a state where the surface contact state between the inclined surface 10 of the taper member 8 and the inner surface 14 of the contact portion 12 is reliably maintained. It can be moved (guided) to the opening side (base end side) of the hole 3.

  When the anchor bolt 1 is inserted into the hole 3 and the free end side of the contact portion 12 of the expanding member 9 is pressed against the inner peripheral surface 16 of the hole 3, the bolt body 5 (tapered member) inserted into the hole 3. When 8) is moved to the opening side (base end side) of the hole 3, the free end of the contact portion 12 is caught on the inner peripheral surface 16 of the hole 3. Accordingly, the expanding member 9 is restrained from moving toward the opening side of the hole 3 along with the taper member 8, and the abutting portion 12 is moved inside the hole 3 by the taper member 8 moving toward the opening side of the hole 3. It can be reliably pushed to the peripheral surface 16 side. Further, when the contact portion 12 is pressed against the inner peripheral surface 16 of the hole 3, when the anchor bolt 1 is inserted into the hole 3, the contact portion 12 serves as a guide, and the anchor bolt 1 is inserted into the hole 3. 3 can be inserted accurately.

  The engaging projections 18 and the engaging projections 18 are formed on the inclined surfaces 10 of the tapered members 8 and the inner surfaces 14 of the contacting portions 12 which are smaller in number than the inclined surfaces 10 and the contacting portions 12 of the taper member 8. When the engagement concave portion 19 to be engaged is provided, the number of the engagement convex portions 18 and the engagement concave portions 19 can be suppressed by that amount, and the labor for forming the engagement convex portion 18 and the engagement concave portion 19 can be reduced. Can be reduced.

  When the reinforcing material 26 is provided in the bridging portion 13, the strength of the bridging portion 13 is increased and it is difficult to bend. Accordingly, the bending of each contact portion 12 connected to the bridging portion 13 with the bending of the bridging portion 13 is reduced, and the outer peripheral surface 15 of the contact portion 12 is changed to the inner peripheral surface 16 of the hole 3. Can be pressed firmly against.

It is a perspective view showing an anchor bolt concerning the 1st example of the present invention. It is a perspective view of the taper member which concerns on 1st Example. It is a perspective view of the expansion member which concerns on 1st Example. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. It is a longitudinal cross-sectional view for demonstrating the procedure which mounts the anchor bolt of this invention to a hole. It is a longitudinal cross-sectional view which shows the state which mounted | wore the anchor bolt of this invention in the hole. FIG. 5 is a view corresponding to FIG. 4 showing an anchor bolt according to a second embodiment of the present invention. FIG. 5 is a view corresponding to FIG. 4 showing an anchor bolt according to a third embodiment of the present invention. FIG. 5 is a view corresponding to FIG. 4 showing an anchor bolt according to a fourth embodiment of the present invention. It is a longitudinal cross-sectional view which shows the Example which provided the reinforcing material in the bridge | crosslinking part which concerns on this invention.

  A first embodiment of an anchor bolt according to the present invention will be described with reference to FIGS. As shown in FIG. 6, the anchor bolt 1 of the present invention is inserted (fixed) into a hole 3 (provided) in a wall surface 2 of a concrete ceiling, for example, and fixed (held).

  As shown in FIGS. 1 and 5, the anchor bolt 1 includes a bolt main body 5 in which a male screw 4 is formed in almost the entire area of a cylindrical outer peripheral surface, and a longitudinal tip of the bolt main body 5 (see FIG. 1 and FIG. 5). 1 has a spreading mechanism 6 arranged at the left end). On the base end (right end in FIG. 1) side of the bolt body 5, members such as equipment not shown and piping are fixed.

  The expansion mechanism 6 includes a taper member 8 formed along the central axis with a female screw 7 (see FIG. 2) that is screwed into the male screw 4 of the bolt body 5, and an expansion that is externally fitted to the taper member 8. Member 9. The taper member 8 is connected to the front end side of the bolt body 5. As shown in FIG. 2, the taper member 8 is formed in a substantially cylindrical shape, and toward the base end (right end in FIG. 2) side of the taper member 8 on both the left and right sides of the peripheral side surface of the taper member 8. Accordingly, an inclined plane 10 having an inclined plane shape that is inclined so as to approach the central axis of the taper member 8 is formed (see FIG. 5).

  As shown in FIGS. 1 and 3, the expanding member 9 includes a pair of left and right contact portions 12, 12 and a bridging portion 13 that connects the tip side (left side in FIG. 3) of each contact portion 12. Have. The bridging portion 13 is located on the distal end side (left side in FIG. 1) of the anchor bolt 1 in the expanding member 9. Each contact portion 12 is provided with an inclined flat inner surface (contact surface) 14 that can come into surface contact with the inclined surface 10 of the taper member 7 (see FIG. 6). The inner surface 14 of the contact portion 12 is in surface contact with the inclined surface 10 of the taper member 8 (the state shown in FIG. 6) and is directed toward the base end side (the lower side in FIG. 6) of the anchor bolt 1. The taper member 8 is inclined so as to approach the central axis. The inclination angle of the inner surface 14 of the contact portion 12 is substantially equal to the inclination angle of the inclined surface 10 of the taper member 8.

  The outer peripheral surface 15 of each contact portion 12 is formed in a substantially cylindrical surface shape, and each inner surface 14 of each contact portion 12 is in surface contact with each inclined surface 10 of the taper member 8. The outer peripheral surface 15 of the contact portion 12 can be brought into surface contact with the inner peripheral surface 16 of the hole 2. The bolt body 5 and the taper member 8 are made of stainless steel or the like, and the expanding member 9 is made of aluminum alloy or the like.

  The expanding member 9 is elastically deformable, and the left and right contact portions 12 and 12 can swing (move) in the left-right direction. The expanding member 9 is in a free state (the state shown in FIG. 1) before being inserted into the hole 3, and the taper member 8 as each contact portion 12 moves toward the free end side (right side in FIG. 1) of the contact portion 12. It is formed to be away from. When the anchor bolt 1 is inserted into the hole 3, the free end side of each contact portion 12 is pressed against the inner peripheral surface 16 of the hole 3 (see FIG. 5). Thereby, when the bolt main body 5 (taper member 8) moves to the opening side of the hole 3 (downward in FIG. 6), the free end side of the contact portion 12 is caught on the inner peripheral surface 16 of the hole 3. The movement of the expanding member 9 along with the taper member 8 to the opening side of the hole 3 is suppressed.

  As shown in FIG. 1 and FIG. 3, the front end side of the contact portion 12 is provided at both edges in the front-rear direction (width direction of the inner surface 14) of the inner surface 14 in each of the left and right contact portions 12 of the spreading member 9. A pair of front and rear engaging projections 18 and 18 extending in the length direction of the contact portion 12 is provided (provided) from the base end side to the base end side. As shown in FIGS. 2 and 4, the engaging projections 18 of the contact portion 12 are provided at both edges in the front-rear direction (width direction of the inclined surface 10) of the left and right inclined surfaces 10 in the taper member 8. Are respectively provided (provided) with a pair of front and rear engaging recesses 19 and 19 to be engaged (fitted). As shown in FIG. 2, each engagement recess 19 of the taper member 8 extends in the length direction of the taper member 8 from the distal end side to the proximal end side of the inclined surface 10 of the taper member 8.

  The tapered member 8 has a surface on the tip side of each inclined surface 10 formed substantially parallel to the central axis of the tapered member 8. As a result, the angle between the surface on the tip side of the inclined surface 10 and the tip surface of the taper member 8 becomes too small, and the edge on the tip side of the inclined surface 10 is prevented from being easily distorted.

  The inclination angle of the projecting end surface (tip surface) 18a projecting toward the engaging recess 19 side of the taper member 8 in the engaging projection 18 of each abutting portion 12 of the spreading member 9 depends on the corresponding abutting portion 12. It is substantially equal to the inclination angle of the inner surface 14. In each engagement recess 19 of the taper member 8, the inclination angle of the back end surface 19 a facing the protrusion end surface 18 a of the engagement protrusion 18 of the contact portion 12 is substantially the same as the inclination angle of the corresponding inclined surface 10 of the taper member 8. Are equal.

  In a state in which the expanding member 9 is externally fitted to the taper member 8 (the state shown in FIG. 1), the side surface 18b of the engaging convex portion 18 of the left and right contact portions 12 (the side surface perpendicular to the inner surface 14 of the contact portion 12) The engagement protrusion 18 and the engagement recess 19 are formed so that the side surface 19b of the engagement recess 19 of the taper member 8 (the side surface perpendicular to the inclined surface 10 of the taper member 8) faces each other. ing.

  The anchor bolt 1 having this configuration is configured so that the engagement convex portion 18 of the contact portion 12 and the engagement concave portion 19 of the taper member 8 are engaged even when the taper member 8 is moved relative to the contact portion 12 in the axial direction. The state is maintained, and the engagement state between the engagement convex portion 18 of the contact portion 12 and the engagement concave portion 19 of the taper member 8 is maintained even in the free state before being inserted into the hole 3. .

  In the anchor bolt 1, for example, the taper member 8 tends to rotate relative to the contact portion 12 (expanding member 9) or move relatively in the front-rear direction (lateral direction). However, in that case, each planar inclined surface 10 of the tapered member 8 abuts on the planar inner surface 14 of each abutting portion 12, and each side surface 18 b of each engaging convex portion 18 engages with each other. The side surface 19b of the concave portion 19 quickly comes into contact, and the rotation and the movement in the front-rear direction are suppressed. When the taper member 8 is relatively moved in the left-right direction (lateral direction), the taper member 8 can also be suppressed by contact between the projecting end surface 18 a of the engaging convex portion 18 and the rear end surface 19 a of the engaging concave portion 19. There may be a slight gap between the side surface 18 b of the engagement convex portion 18 of the contact portion 12 and the side surface 19 b of the engagement concave portion 19 of the taper member 8.

  As shown in FIG. 1, a plurality of (three in this embodiment) grooves 20 are formed on the base end side of the outer peripheral surface 15 of each contact portion 12 of the expanding member 9. The grooves 20 are arranged at equal intervals in the direction, and the grooves 20 extend in the circumferential direction of the outer peripheral surface 15 of the contact portion 12. When the anchor bolt 1 is inserted into the hole 3, the edge of the groove 20 is hooked (latched) on the inner peripheral surface 16 of the hole 3, and the expanding member 9 also moves toward the opening side of the hole 3. Moving is suppressed.

  Next, an example of a procedure for mounting the anchor bolt 1 of the first embodiment into the hole 3 will be described. First, the taper member 8 is screwed to the tip end portion (left end portion in FIG. 1) of the bolt body 5 of the anchor bolt 1, and the expanding member 9 is externally fitted to the taper member 8. At the time of the external fitting, the engagement convex portions 18 of the respective contact portions 12 are engaged with the respective engagement concave portions 19 of the taper member 8 (state of FIG. 1).

  After that, as shown in FIG. 5, the anchor bolt 1 is inserted into the hole 3 with the tip side up, and the bridging portion 13 of the expanding member 9 is formed on the upper surface (back surface) 22 of the hole 3. Insert until contact (see FIG. 6). Next, the bolt body 5 is pulled (moved) toward the opening side of the hole 3 by pulling the bolt body 5 toward the opening side (base end side) of the hole 3. At that time, the base end of each contact portion 12 of the expanding member 9 and the edge of the groove 20 are hooked (latched) on the inner peripheral surface 16 of the hole 3, and the expanding member 9 is on the opening side of the hole 3. It is suppressed to move to. That is, it is possible to suppress the expansion member 9 from being lowered as the taper member 8 is lowered. Even if the expanding member 9 tries to rotate in the circumferential direction of the hole 3, the circumferential edge of each contact portion 12 is caught by the inner peripheral surface 16 of the hole 3, and the rotation of the expanding member 9 is suppressed. .

  Thereby, the inner surface 14 of each contact portion 12 of the expanding member 9 is surely pushed toward the inner peripheral surface 16 side of the hole 3 by each inclined surface 10 of the descending taper member 8, and each contact portion 12. The outer peripheral surface 15 can be pressed firmly against the inner peripheral surface 16 of the hole 3. As a result, the anchor bolt 1 is held (temporarily fixed) in the hole 3 by friction between the outer peripheral surface 15 of the contact portion 12 and the inner peripheral surface 16 of the hole 3.

  As shown in FIG. 6, a bracket 23 for fixing equipment and piping (not shown) is attached to the male screw 4 of the bolt body 5 of the anchor bolt 1, and a nut 24 is screwed under the bracket 23. Wear (wear). Next, the nut 24 is rotated with a tool such as a wrench (spanner), and the nut 24 is pressed around the lower edge of the hole 3 through the bracket 23. Further, by rotating the nut 24, the bolt body 5 is pulled downward by the nut 24.

  When the nut 24 is rotated, the bolt body 5 tries to rotate with the nut 24, and the taper member 8 tries to rotate with the bolt body 5. As described above, the rotation of the taper member 8 suppresses the rotation of the expansion member 9, and the inclined surfaces 10 of the taper member 8 are respectively formed on the inner surfaces 14 of the contact portions 12 of the expansion member 9. It is suppressed by the contact of the engagement concave portions 19 of the taper member 8 with the engagement convex portions 18 of the contact portions 12.

  As a result, without rotating the taper member 8, the taper member 8 is lowered to the opening side of the hole 3 by a screw action, and the inner surface 14 of each contact portion 12 is moved by the inclined surface 10 of the taper member 8 to the inner peripheral surface 16 of the hole 3. The outer peripheral surface 15 of each contact portion 12 can be strongly pressed against the inner peripheral surface 16 of the hole 3 by pressing firmly to the side. Thereby, the anchor bolt 1 is firmly fixed to the inner peripheral surface 16 of the hole 3, and the anchor bolt 1 can be reliably prevented from coming out of the hole 3.

  Even if the bolt body 5 of the anchor bolt 1 fixed in the hole 3 is pulled downward by the weight (external force) of the equipment or the like, the taper member 8 strengthens the inner surface 14 of each contact portion 12 accordingly. Since it pushes, the outer peripheral surface 15 of each contact part 12 is pressed more strongly against the inner peripheral surface 16 of the hole 3, and the anchor bolt 1 can be reliably prevented from coming out of the hole 3.

  As described above, the engaging projections 18 of the contact portions 12 of the expanding member 9 are engaged (fitted) with the engaging recesses 19 of the taper member 8, so that the taper member 8 with respect to the expanding member 9 is engaged. Since the relative rotation and the relative movement in the lateral direction are suppressed, the taper member 8 is allowed to move only in the vertical direction, and the taper member 8 suppresses the vibration of the bolt body 5 in the rotation direction and the lateral direction. Further, the vertical movement of the taper member 8 can be guided by the engagement between the engagement convex portion 18 of the contact portion 12 of the expanding member 9 and the engagement concave portion 19 of the taper member 8.

  Next, a second embodiment of the anchor bolt 1 according to the present invention will be described with reference to FIG. In the anchor bolt 1 of the second embodiment, the expansion member 9 of the expansion mechanism 6 has four contact portions 12 on the front, rear, left and right. Further, the tapered surface 8 is formed with inclined surfaces 10 at four locations on the front, rear, left and right sides corresponding to the four contact portions 12.

  Engagement projections 18 are respectively provided (provided) in the middle in the width direction of the inclined surfaces 10 of the taper member 8. Correspondingly, an engagement concave portion 19 into which the engagement convex portion 18 of the taper member 8 is fitted and engaged (fitted) is provided in the middle in the width direction of the inner surface 14 of each contact portion 12 of the expanding member 9. Each is recessed (provided). Each engagement convex part 18 and each engagement concave part 19 are each formed in the cross-sectional square shape. The four contact portions 12 have their tips connected to the bridging portion 13 of the expanding member 9 as in the first embodiment. Since other configurations are the same as those of the first embodiment, the description thereof is omitted.

  In the anchor bolt 1 of the second embodiment, when the bolt body 5 and the taper member 8 are lowered (moved) to the opening side of the hole 3 after being inserted into the hole 3, the front, rear, left and right contact portions 12 are The tapered member 8 is pushed toward the inner peripheral surface 16 side of the hole 3 by the front, rear, left and right inclined surfaces 10, and the outer peripheral surface 15 of each contact portion 12 is pressed against the inner peripheral surface 16 of the hole 3.

  As described above, in the anchor bolt 1 of the second embodiment, the outer peripheral surfaces 15 of the four contact portions 12 are pressed against the inner peripheral surface 16 of the hole 3, so that the anchor bolt 1 is firmly fixed to the hole 3 ( Hold). Even in the second embodiment, even if the taper member 8 tries to vibrate in the rotational direction or the lateral direction, the side surfaces 18b and 18b on both sides of each engaging convex portion 18 are quickly brought into contact with the side surfaces 19b and 19b on both sides of each engaging concave portion 19. It abuts and the vibration (movement) of the taper member 8 in the rotational direction and lateral direction is firmly suppressed.

  Next, a third embodiment of the anchor bolt 1 according to the present invention will be described with reference to FIG. Also in the anchor bolt 1 of the third embodiment, as in the second embodiment, the expanding member 9 of the expanding mechanism 6 has four contact portions 12 on the front, rear, left and right, and the taper member 8 has front, rear, left and right The inclined surfaces 10 are formed at four locations. Further, the tips of the four contact portions 12 are connected to the bridging portion 13 of the spreading member 9, respectively.

  In addition, in the anchor bolt 1 of the third embodiment, the engagement protrusions 18 are not provided on the front and rear contact portions 12 and 12, and the left and right contact portions 12 and 12 are provided on the taper member 8 correspondingly. Only the engagement concave part 19 with which the engagement convex part 18 engages is provided. Other configurations are the same as those of the first and second embodiments, and thus description thereof is omitted.

  In the anchor bolt 1 of the third embodiment, among the four abutting portions 12 of the expanding member 9, the engaging convex portions 18 of the left and right abutting portions 12 are respectively connected to the engaging concave portions 19 of the tapered member 8. Since the four contact portions 12 are engaged (fitted) and are connected via the bridging portion 13, the engagement protrusions 18 and the engagements are provided on the front and rear contact portions 12 and the taper member 8. Even if the recess 19 is not provided, the relative rotation of the taper member 8 with respect to the expanding member 9 can be reliably suppressed.

  Next, a fourth embodiment of the anchor bolt 1 according to the present invention will be described with reference to FIG. Similarly to the second and third embodiments, the anchor bolt 1 of the fourth embodiment also has four front and rear, right and left abutting portions 12 on the expansion member 9 of the expansion mechanism 6, and is a tapered member. In FIG. 8, inclined surfaces 10 are formed at four locations, front, rear, left and right. Further, the tips of the four contact portions 12 are connected to the bridging portion 13 of the spreading member 9, respectively.

  In addition, in the anchor bolt 1 of the fourth embodiment, the engaging protrusions 18 are provided (provided) on both edges in the width direction of the inner surface 14 of each contact portion 12 of the spreading member 9, respectively. Engaging recesses 19 and 19 for engaging (fitting) the engaging projections 18 of the contact portion 12 are respectively provided on both edges in the width direction of the inclined surfaces 10 of the taper member 8. Yes (provided).

  Even in the fourth embodiment, even if the taper member 8 tries to vibrate in the rotational direction or the lateral direction, the side surface 18b of each contact portion 12 quickly contacts the side surface 19b of each inclined surface 10 of the taper member 8, and the taper member. The vibration in the rotational direction and the lateral direction of 8 is firmly suppressed.

  A reinforcing member 26 shown in FIG. 10 is preferably provided on the bridging portion 13 of the spreading member 9. For example, the reinforcing material 26 has a shape substantially equal to the inner surface of the tip of the bridging portion 13. By providing the reinforcing material 26 in the bridging portion 13, the strength of the bridging portion 13 is increased and it is difficult to bend. Since the bridging portion 13 is difficult to bend, the contact portions 12 connected to the bridging portion 13 are suppressed from being bent along with the bending of the bridging portion 13. Thereby, the outer peripheral surface 15 of the contact portion 12 can be firmly pressed against the inner peripheral surface 16 of the hole 3. The reinforcing material 26 is made of metal or synthetic resin. In addition, although the shape of the reinforcing material 26 is preferably a flat plate shape, it may not necessarily be a flat plate shape. Further, the shape of the reinforcing material 26 may be a circle or a rectangle.

  A washer (not shown) or the like may be mounted on the upper side of the nut 24 instead of the bracket 23. An engagement recess 19 may be provided in each contact portion 12 of the spreading member 9, and an engagement protrusion 18 may be provided in the taper member 8. The contact part 12 and the inclined surface 10 of the taper member 8 may be three or five or more, respectively.

DESCRIPTION OF SYMBOLS 1 Anchor bolt 2 Wall surface 3 Hole of wall surface 5 Bolt main body 8 Taper member 9 Expanding member 10 Inclined surface of taper member 12 Abutting part of expanding member 13 Bridging part of expanding member 14 Inner surface 15 of abutting part Outer peripheral surface 16 inner peripheral surface of hole 18 engaging convex portion 18b side surface of engaging convex portion 19 engaging concave portion 19b side surface of engaging concave portion

Claims (4)

An anchor bolt (1) that is inserted into a hole (3) provided in a wall surface (2) and fixed from the tip side,
A cylindrical taper member (8) connected to the columnar bolt body (5), and an expanding member (9) fitted on the taper member (8);
On the peripheral side surface of the tapered member (8), a flat inclined surface (10) is inclined so as to approach the central axis of the tapered member (8) toward the proximal end side of the tapered member (8). Forming
The spreading member (9) has a contact portion (12), and the contact portion (12) has a planar shape that can be brought into surface contact with the inclined surface (10) of the taper member (8). In the state where the inner surface (14) of the contact portion (12) is in surface contact with the inclined surface (10) of the tapered member (8), the contact portion (12) is provided. ) Outer peripheral surface (15) is in surface contact with the inner peripheral surface (16) of the hole (3),
At least one of the inclined surface (10) of the taper member (8) and the inner surface (14) of the abutting portion (12) is provided with an engaging projection (18). An engagement recess (19) that engages the engagement protrusion (18) is provided so that the taper member (8) moves relative to the contact portion (12) in the axial direction. An engagement state between the engagement convex part (18) and the engagement concave part (19) is maintained,
An anchor bolt characterized in that a side surface (18b) of the engaging convex portion (18) and a side surface (19b) of the engaging concave portion (19) face each other. A plurality of inclined surfaces (10) of the taper member (8) and a plurality of contact portions (12) facing the inclined surface (10) are provided, and the tip side of each contact portion (12) is provided. Are connected by a bridging part (13),
In the free state before being inserted into the hole (3), the expanding member (9) is formed so that the contact portion (12) is separated from the tapered member (8) as it goes to the free end side. The engagement state between the engagement projection (18) and the engagement recess (19) is maintained even in a free state before being inserted into the hole (3),
When the anchor bolt (1) is inserted into the hole (3), the outer peripheral surface (15) of the contact portion (12) is pressed against the inner peripheral surface (16) of the hole (3). The anchor bolt according to claim 1. A plurality of inclined surfaces (10) of the taper member (8) and a plurality of contact portions (12) facing the inclined surface (10) are provided, and the tip side of each contact portion (12) is provided. Are connected by a bridging part (13),
One or more of the plurality of inclined surfaces (10) of the tapered member (8) and the plurality of contact portions (12), the inclined surface (10) of the tapered member (8) and the contact. On the inclined surface (10) of the taper member (8), which is smaller in number than the number of the portions (12), and on the inner surface (14) of the contact portion (12), the engagement convex portion (18) and its engagement are provided. The anchor bolt according to claim 1 or 2, wherein the engagement recess (19) for engaging the mating projection (18) is provided.   The anchor bolt according to any one of claims 1 to 3, wherein a reinforcing material (26) is provided in the bridge portion (13).