JP2016011504A - Construction method of anchor bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of an anchor bolt capable of surely fixing the anchor bolt to a mounting hole provided on a wall surface.SOLUTION: An anchor bolt on the present invention comprises a rod 4, a taper member 7 provided with a female screw 6 for threadedly engaging with a male screw 3 of the rod 4 and formed with four inclined planes 10, four abutting parts 12 having an inclined plane-shaped inner surface 11 capable of contacting in a surface with the inclined planes 10 of the taper member 7 and a crosslinking part 13 for connecting a tip part of the abutting parts 12. A construction method of the present invention fixes the anchor bolt to a mounting hole 2 by pressing the abutting parts 12 to an inner peripheral surface 2a of the mounting hole 2 by moving the respective abutting parts 12 to the inner peripheral surface 2a side of the mounting hole 2 by moving the taper member 7 to the opening side of the mounting hole 2 by rotating the rod 4 by allowing a tip surface 4a of the rod 4 to abut on an upper surface 2b of the mounting hole 2 by inserting the anchor bolt into the mounting hole 2 in a state of inserting a tip part of the rod 4 into an insertion hole 14 of a body part 13a of the crosslinking part 13.

Description

  The present invention relates to a method for constructing an anchor bolt that is inserted into and fixed to a mounting hole provided on a wall surface such as a rock wall, a concrete floor, or a ceiling.

  As the anchor bolt according to the present invention, for example, as shown in Patent Document 1, inclined taper surfaces that are farther from the center axis of the anchor bolt toward the tip side (lower side in the drawing of Patent Document 1) are formed on the left and right. A slider, two left and right retaining members forming a reverse tapered surface in contact with the tapered surface of the slider on the inner surface side, and a connecting bottom plate that connects (connects) the lower ends of these retaining members; And a bolt screwed into a female screw formed in a penetrating manner in the slider.

  As a construction method of the anchor bolt, for example, a hole (mounting hole) is drilled using a drill or the like on a concrete floor or the like, the anchor bolt is inserted into the hole, and the tip surface of the bolt (see Patent Document 1). In the drawing, a lower end surface) is brought into contact with a protrusion provided on the connection bottom plate, and the bolt is rotated in that state. As a result, the slider is raised by a screw action, and the taper surface of the slider presses the reverse taper surface of the retaining member. Then, the retaining member expands in the horizontal direction (lateral direction), and the outer peripheral surface of the retaining member is pressed against the inner peripheral surface of the hole in a surface contact state, and the outer peripheral surface of the retaining member and the inner periphery of the hole The anchor bolt is fixed to the hole by a frictional force with the surface.

Japanese Utility Model Publication No. 49-49363

  However, in the anchor bolt construction method of Patent Document 1, in order to rotate the bolt with the front end surface of the bolt in contact with the projection of the connecting bottom plate, the taper surface of the slider is reverse tapered of the retaining member. When pressed against the surface, the reaction causes the bolt to be pressed downward, and the connecting bottom plate is pressed downward via the protrusion.

  As a result, the connecting bottom plate is bent downward, and the retaining member is pulled downward and distorted by being pulled toward the center axis side of the anchor bolt. As a result, the outer peripheral surface (especially the lower end side) of the retaining member is separated from the inner peripheral surface of the hole, the frictional force between the outer peripheral surface of the retaining member and the inner peripheral surface of the hole is reduced, and the anchor bolt is There is a risk of coming out of the hole.

  The present invention has been provided for the purpose of solving this problem, and it is an object of the present invention to provide an anchor bolt construction method capable of securely fixing an anchor bolt to a mounting hole provided in a wall surface.

  The present invention solves such a problem, and is an anchor bolt construction method in which the anchor bolt is inserted into and fixed to a mounting hole 2 provided in the wall surface 1, and the anchor bolt is a rod having a male screw 3 formed on the outer peripheral surface thereof. 4 and a female screw 6 into which the male screw 3 of the rod 4 is screwed, and a plurality of inclined surfaces 10 which are inclined so as to approach the central axis toward the proximal end side are formed on the outer peripheral surface. A plurality of contact portions 12 each having a tapered member 7, a plurality of contact surfaces 12 each having an inclined surface shape 11 that can come into surface contact with the inclined surface 10 of the taper member 7, and the tip portions of the contact portions 12. A main body portion of the bridging portion 13 that has the contact portion 12 and the bridging portion 13 fitted on the taper member 7 so that the distal end portion of the rod 4 faces the distal end surface 4 a of the rod 4. Insertion in 13a Inserting the anchor bolt into the mounting hole 2 while passing through the hole 14, the tip surface 4 a of the rod 4 is brought into contact with the back surface 2 b of the mounting hole 2, and the tip of the rod 4 in contact with the back surface 2 b of the mounting hole 2 By rotating the rod 4 with the surface 4a as a fulcrum, the taper member 7 is moved to the opening side of the mounting hole 2 by a screw action, thereby moving each contact portion 12 to the inner peripheral surface 2a side of the mounting hole 2. The abutting portion 12 is pressed against the inner peripheral surface 2 a of the mounting hole 2, and the anchor bolt is fixed to the mounting hole 2.

  The wall surface 1 includes a civil engineering structure such as a tunnel, a concrete ceiling of a building, a wall surface such as a side wall and a floor, and a rock wall surface. The inclined surface 10 of the taper member 7 and the inner surface 11 of the contact portion 12 are preferably planar, but may be slightly curved. The tip surface 4a of the rod 4 corresponds to a planar shape, a conical surface shape, a hemispherical shape, or the like. The distal end portion of the rod 4 corresponds to a portion of the rod 4 from the distal end surface 4a of the rod 4 to a position that is somewhat proximal. The main body portion 13a of the bridging portion 13 is preferably a flat plate shape, but may be included even if it is slightly curved. Here, when the anchor bolt is inserted into the mounting hole 2 after passing the distal end portion of the rod 4 through the insertion hole 14 of the body portion 13a of the bridging portion 13, the distal end portion of the rod 4 is inserted after the anchor bolt is inserted into the mounting hole 2. And the case of passing through the insertion hole 14 of the body portion 13a of the bridging portion 13 is included. The rotation direction of the rod 4 corresponds to the direction in which the taper member 7 is moved to the opening side of the mounting hole 2.

  When the anchor bolt is inserted into the mounting hole 2, the outer peripheral surface 15 of the bridging portion 13 or the contact portion 12 can be pressed against the inner peripheral surface 2 a of the mounting hole 2 by the elastic restoring force of the bridging portion 13.

  Here, for example, the contact portion 12 is configured to be separated from the rod 4 toward the free end side (the lower end side of the contact portion 12 in FIG. 1 corresponds), and the anchor bolt is inserted into the mounting hole 2. In this case, the contact portion 12 is pushed by the inner peripheral surface 2a of the mounting hole 2 and the bridging portion 13 is elastically deformed, and the contact portion 12 contacts the inner peripheral surface 2a of the mounting hole 2 by the elastic restoring force at that time. In the case of being pressed, the connecting part 13b connected to the main body part 13a of the bridging part 13 is obliquely extended outward of the bridging part 13, and then bent inward of the bridging part 13 in the middle of the length direction. When the tip of the abutting portion 12 is connected and the anchor bolt is inserted into the mounting hole 2, the intermediate portion of the connecting portion 13b (a part of the bridging portion 13) is the inner periphery of the mounting hole 2. The connection part 13b is elastically deformed by being pushed by the surface 2a, and the elasticity at that time Such as when the connection portion 13b and the contact portion 12 under a force is pressed against the inner circumferential surface 2a of the mounting hole 2 corresponds.

  In the anchor bolt construction method according to the present invention, the distal end portion of the rod 4 is passed through the insertion hole 14 of the body portion 13 a of the bridging portion 13, and the distal end surface 4 a of the rod 4 is brought into contact with the inner surface 2 b of the mounting hole 2. Since the rod 4 is rotated with the tip surface 4a of the rod 4 as a fulcrum, the tip surface 4a of the rod 4 is not pressed against the main body portion 13a of the bridging portion 13 when the rod 4 is rotated. The bending of the bridging portion 13 due to the pressing of 4 can be suppressed. Accordingly, the contact portion 12 can be prevented from being pulled and distorted by the bending of the bridging portion 13 toward the center axis side of the anchor bolt, and the outer peripheral surface 15 of the contact portion 12 and the inner peripheral surface 2a of the mounting hole 2 can be prevented. The anchor bolt can be securely fixed to the mounting hole 2 with sufficient force.

  When the anchor bolt is inserted into the mounting hole 2, a part of the bridging part 13 or the outer peripheral surface 15 of the contact part 12 is pressed against the inner peripheral surface 2 a of the mounting hole 2 by the elastic restoring force of the bridging part 13. A part of the bridging portion 13 and the contact portion 12 are temporarily fixed to the attachment hole 2 by friction with the inner peripheral surface 2 a of the attachment hole 2. Thereby, when the rod 4 is rotated around its central axis in a state where the tip surface 4a of the rod 4 is in contact with the inner surface 2b of the mounting hole 2, the taper member 7 is accompanied by the rotation of the rod 4. Even if the rotation is attempted, the inclined surface 10 of the taper member 7 comes into contact (contacts) with the inner surface 11 of the abutting portion 12 that is temporarily fixed, and the rotation of the taper member 7 is suppressed. Accordingly, when the rod 4 is rotated, the taper member 7 is moved to the opening side of the mounting hole 2 by a screw action without rotating, and the abutting portion 12 is reliably moved to the inner peripheral surface 2a side of the mounting hole 2. By moving, the contact portion 12 can be firmly pressed against the inner peripheral surface 2 a of the mounting hole 2. As a result, the anchor bolt can be reliably fixed to the mounting hole 2.

It is a longitudinal section showing an example of an anchor bolt concerning the present invention. It is a top view of an anchor bolt. It is a longitudinal cross-sectional view which shows the state at the time of inserting an anchor bolt in a mounting hole. It is a longitudinal cross-sectional view which shows the state which inserted the anchor bolt in the attachment hole. It is a longitudinal cross-sectional view which shows the state which fixed the anchor bolt to the attachment hole.

  An embodiment of an anchor bolt construction method according to the present invention will be described with reference to FIGS. The anchor bolt is inserted and fixed in a mounting hole 2 provided in a wall surface 1 of a concrete ceiling (for example) (see FIG. 5). The mounting hole 2 is formed by drilling upward as shown in FIG.

  As shown in FIG. 1, the anchor bolt includes a cylindrical rod 4 having a male screw 3 formed on the outer peripheral surface, and an anchor bolt on the cylindrical inner peripheral surface 2 a (FIG. 3) of the mounting hole 2. And an expansion mechanism 5 for fixing. The spreading mechanism 5 is disposed in the vicinity of the tip of the rod 4 (upper end in FIG. 1). The expansion mechanism 5 is provided with a female screw 6 that is screwed (tightened) with the male screw 3 of the rod 4 in a penetrating manner along the central axis, and is directed toward the base end side (lower end side in FIG. 1). The taper member 7 has four planar inclined surfaces 10 that are inclined so as to approach the central axis on the outer peripheral surface, and the expanding member 8 that is externally fitted to the taper member 7. doing.

  The outer peripheral surface of the taper member 7 has a cylindrical surface shape, and the inclined surfaces 10 are formed at four positions on the front, rear, left and right of the outer peripheral surface of the taper member 7. That is, the inclined surfaces 10 are arranged at equal intervals in the circumferential direction of the taper member 7. The inclined surface 10 of the taper member 7 may not be formed up to the tip (upper end in FIG. 1) of the taper member 7. In this case, the tip of the taper member 7 has an upright surface shape.

  The expansion member 8 includes four front and rear abutment portions 12 each having an inclined surface-shaped inner surface 11 that can come into surface contact with the respective inclined surfaces 10 of the taper member 7, and the abutment portions 12. And an elastically deformable bridging portion 13 that connects the distal end portions (upper end portions in FIG. 1).

  The inner surface 11 of each abutting portion 12 is in contact with each inclined surface 10 of the taper member 7 (the state shown in FIG. 5), and the anchor is moved toward the base end side (the lower end side in FIG. 1) of the anchor bolt. It inclines so that it may approach the central axis of a volt | bolt (taper member 7). The inclination angle of the inner surface 11 of each contact portion 12 is substantially equal to the inclination angle of each inclined surface 10 of the taper member 7.

  The bridging portion 13 includes a thin plate-like main body portion 13a disposed facing the front end surface 4a of the rod 4 (the upper surface [tip surface] 7a of the taper member 7), and the edge of the main body portion 13a. Each of the contact portions 12 has four thin plate-like connection portions 13b that extend to the distal end side of the contact portion 12 and connect the distal end portions of the respective contact portions 12. The connection portion 13b is connected to the free end portion (lower end portion in FIG. 1) of the contact portion 12 by caulking or welding.

  As shown in FIG. 2, the main body portion 13a of the bridging portion 13 has a substantially square shape, and the connecting portions 13b are connected to the four apex portions (corner portions). A circular insertion hole 14 into which the rod 4 can be inserted is formed in the central portion (central portion) of the body portion 13a of the bridging portion 13. The diameter of the insertion hole 14 in the main body portion 13a of the bridging portion 13 may be equal to the outer diameter of the rod 4, but is preferably slightly larger than the outer diameter of the rod 4 in order to facilitate the insertion of the rod 4. .

  As shown in FIG. 1, each connection part 13b of the bridging part 13 extends obliquely downward from the edge of the main body part 13a to the outside of the bridging part 13, and then the inner part of the bridging part 13 in the middle of the length direction. The tip of the abutting portion 12 is connected to the free end thereof. When the anchor bolt is pushed into the mounting hole 2, the intermediate portion of the connection site 13 b comes into contact with the edge of the opening of the mounting hole 2 or the inner peripheral surface 2 a of the mounting hole 2, so The connecting portion 13b is elastically deformed by being pushed toward the taper member 7 side, and the intermediate portion and the contact portion 12 of the connecting portion 13b are pressed against the inner peripheral surface 2a of the mounting hole 2 by the elastic restoring force at that time ( (See FIG. 4). As a result, the spreading member 8 is held (temporarily fixed) on the inner peripheral surface 2a of the mounting hole 2 so as not to be easily removed from the mounting hole 2.

  The outer peripheral surface 15 of each contact portion 12 is formed in the same cylindrical surface shape as the inner peripheral surface 2 a of the mounting hole 2, whereby the outer peripheral surface 15 of each contact portion 12 is the inner peripheral surface of the mounting hole 2. Surface contact is possible with 2a. The inner surface 11 of the contact portion 12 may not be formed in an inclined shape up to the distal end (upper end in FIG. 1) and the proximal end (lower end in FIG. 1). In this case, the distal end portion and the proximal end portion of the inner surface 11 of the contact portion 12 have an upright surface shape.

  The rod 4 is attached with equipment and piping (not shown). The rod 4 and the taper member 7 are made of stainless steel or the like. Each contact portion 12 of the spreading member 8 is formed of an aluminum alloy or the like, and the bridging portion 13 is formed of stainless steel or the like.

  A plurality of (two in this embodiment) grooves 16 are formed in the length direction of the abutting portion 12 (see FIG. 2) in the lower portion (free end side) of the outer peripheral surface 15 of each abutting portion 12 of the expanding member 8. 1, the grooves 16 extend in the circumferential direction of the outer peripheral surface 15 of each contact portion 12.

  Next, an embodiment of the anchor bolt construction method will be described. First, prior to fixing the anchor bolt to the mounting hole 2, the anchor bolt in which the spreading mechanism 5 is arranged at the tip portion of the rod 4 is assembled. That is, the male screw 3 of the rod 4 is fastened (screwed) to the female screw 6 of the taper member 7 of the expansion mechanism 5 so that the tip of the rod 4 protrudes above the upper surface 7a of the taper member 7 (FIG. 1).

  By passing the distal end portion of the rod 4 through the insertion hole 14 of the main body portion 13a of the bridging portion 13 of the expansion member 8 and inserting the expansion member 8 into the taper member 7, the anchor bolt Is completed. Even when the assembly is completed and the rod 4 is operated in an upright posture with the tip end side facing up, the main body portion 13a of the bridging portion 13 is received by the upper surface 7a of the taper member 7, and the bridging portion 13 ( The spreading member 8) is supported (state of FIG. 1).

  Next, the operator holds the rod 4 in a posture with the expansion mechanism 5 side (the tip end side of the rod 4) up, for example, with one hand, and inserts the anchor bolt into the mounting hole 2 of the wall surface 1. In that case, as shown in FIG. 3, the intermediate part of the connection part 13 b of the bridging part 13 of the spreading member 8 abuts on the edge of the opening of the mounting hole 2, but the anchor bolt is directed into the mounting hole 2. By forcibly pushing in, the connecting portion 13b is elastically deformed and the spreading mechanism 5 enters the mounting hole 2.

  And an anchor bolt is pushed in until the front end surface 4a of the rod 4 contacts the upper surface (back surface) 2b of the mounting hole 2 (state of FIG. 4). In that case, the intermediate part or contact part 12 of the connection part 13b is pressed against the inner peripheral surface 2a of the attachment hole 2 by the elastic restoring force of the connection part 13b, and the expansion member 8 is attached by friction or the like. It is temporarily fixed to the inner peripheral surface 2a of the hole 2 so that it cannot move and rotate. As a result, the vertical movement of the expanding member 8 and the rotation in the circumferential direction are suppressed.

  As a result, when the rod 4 is rotated around its central axis in a state where the tip surface 4a of the rod 4 is in contact with the upper surface 2b of the mounting hole 2 as described above, the rotation of the rod 4 is a taper member. Even if 7 tries to rotate together, the inclined surface 10 of the taper member 7 comes into contact with (in contact with) the inner surface 11 of the contact portion 12 of the spreading member 8 that is temporarily fixed, and the taper member 7 rotates. The taper member 7 is only allowed to move up and down. Accordingly, when the rod 4 is rotated in a predetermined direction (a direction in which the taper member 7 moves toward the opening side of the mounting hole 2), the taper member 7 does not rotate, and the opening side (see FIG. 4 moves down (moves down).

  Further, when the contact portion 12 is pressed against the inner peripheral surface 2a of the mounting hole 2 as described above, the upper and lower edges of the groove 16 of the contact portion 12 are caught by the inner peripheral surface 2a of the mounting hole 2, This further suppresses the expansion member 8 from moving in the vertical direction in combination with the temporary fixing by the connection portion 13b of the expansion member 8.

  As the taper member 7 is lowered, each inclined surface 10 of the taper member 7 presses against the inner surface 11 of each contact portion 12 of the expanding member 8, and each contact portion 12 is moved to the inner peripheral surface 2 a side of the mounting hole 2. The outer peripheral surface 15 of each contact portion 12 is firmly pressed against the inner peripheral surface 2a of the attachment hole 2. As a result, the anchor bolt can be securely fixed to the mounting hole 2 by friction between the outer peripheral surface 15 of each contact portion 12 and the inner peripheral surface 2 a of the mounting hole 2.

  A bracket 18 (FIG. 5) for fixing equipment or piping (not shown) is attached to the male screw 3 of the rod 4 of the anchor bolt, and a nut 19 (FIG. 5) is screwed to the lower side of the bracket 18. To do. And nut 19 is tightened with tools, such as a wrench (spanner), and bracket 18 is attached to an anchor bolt (state of Drawing 5).

  When the nut 19 is tightened, the rod 4 is pulled downward, and the rod 4 and the taper member 7 are further lowered. As a result, the inner surface 11 of each contact portion 12 is further pushed toward the inner peripheral surface 2 a side of the mounting hole 2 by each inclined surface 10 of the taper member 7, and the outer peripheral surface 15 of each contact portion 12 is within the mounting hole 2. The anchor bolt is firmly fixed to the mounting surface 2 by being strongly pressed against the peripheral surface 2a. The bracket 18 may be omitted and a washer (not shown) may be mounted on the upper side of the nut 19.

  Even if the anchor bolt rod 4 fixed to the mounting hole 2 is pulled downward due to the weight of the equipment or the like, the inclined surfaces 10 of the taper member 7 move along the inner surfaces 11 of the contact portions 12 accordingly. Since it pushes strongly, the outer peripheral surface 15 of each contact part 12 is strongly pressed against the inner peripheral surface 2a of the attachment hole 2. Thereby, it is possible to reliably prevent the anchor bolt from coming out of the mounting hole 2.

  As described above, when the anchor bolt is fixed to the insertion hole 14, the rod 4 is rotated with the tip surface 4 a of the rod 4 as a fulcrum to lower the taper member 7. For example, the main body portion 13 a of the bridging portion 13 is lowered. In the case where the insertion hole 14 is not provided, the distal end surface 4 a of the rod 4 abuts on the main body portion 13 a of the bridging portion 13. When the rod 4 is rotated in this state, the rod 4 is pushed up by the lowering reaction of the taper member 7, and the rod 4 causes the main body portion 13a of the bridging portion 13 of the expanding member 8 to bend upward. The contact portion 12 is pulled and distorted toward the center axis side of the anchor bolt.

  As a result, the contact between the outer peripheral surface 15 of the contact portion 12 and the inner peripheral surface 2a of the attachment hole 2 becomes insufficient, and the contact between the outer peripheral surface 15 of the contact portion 12 and the inner peripheral surface 2a of the attachment hole 2 is reduced. There is a risk that the anchoring bolt will come out of the mounting hole 2 due to a decrease in the frictional force.

  On the other hand, in the present invention, the tip portion (tip surface 4a) of the rod 4 is brought into contact with the upper surface 2b of the mounting hole 2 through the insertion hole 14 of the main body portion 13a of the bridging portion 13 of the spreading member 8. When the rod 4 is rotated, the rod 4 is not pressed against the body portion 13 a of the bridging portion 13, and bending of the bridging portion 13 due to the pressing of the rod 4 can be suppressed. Accordingly, it is possible to prevent the contact portion 12 from being pulled and distorted due to the bending portion 13 being bent toward the center axis side of the anchor bolt.

  Thereby, the contact between the outer peripheral surface 15 of the contact portion 12 and the inner peripheral surface 2a of the mounting hole 2 is sufficiently maintained, and the space between the outer peripheral surface 15 of the contact portion 12 and the inner peripheral surface 2a of the mounting hole 2 is maintained. It is possible to hold the friction bolt properly and fix the anchor bolt to the mounting hole 2 reliably and with sufficient force.

  Further, when the anchor bolt is in a posture in which the expansion mechanism 5 side (the tip end side of the rod 4) is directed upward, the main body portion 13a of the bridging portion 13 can be supported by the upper surface 7a of the taper member 7, so that the rod 4 of the anchor bolt Can be inserted into the mounting hole 2 with one hand.

  One or more spreading mechanisms 5 may be arranged not only at the tip portion of the rod 4 but also in the middle of the length direction of the rod 4. In that case, since each expansion mechanism 5 can form each contact part 12 and bridge | crosslinking part 13 (main body part 13a and connection part 13b) of the taper member 7, the expansion member 8, respectively, in the same shape, It is possible to suppress the increase in the number of types of anchor bolt parts.

DESCRIPTION OF SYMBOLS 1 Wall surface 2 Mounting hole 2a Inner peripheral surface of mounting hole 2b Upper surface (back surface) of mounting hole
DESCRIPTION OF SYMBOLS 3 Male thread of rod 4 Rod 4a End surface of rod 6 Female thread of taper member 7 Taper member 10 Inclined surface of taper member 11 Inner surface of contact part of expansion member 12 Contact part 13 Bridging part of expansion member 13a Main body part 13b Connection part 14 Insertion hole 15 Outer peripheral surface of contact part

Claims (2)

It is a construction method of an anchor bolt that is inserted into a mounting hole (2) provided in a wall surface (1) and fixed.
The anchor bolt is provided with a rod (4) having a male screw (3) formed on the outer peripheral surface thereof and a female screw (6) into which the male screw (3) of the rod (4) is screwed. A tapered member (7) having a plurality of inclined surfaces (10) inclined toward the central axis toward the end side on the outer peripheral surface, and an inclined surface (10) of the tapered member (7) A plurality of contact portions (12) each having an inclined surface-shaped inner surface (11) capable of surface contact, and a bridging portion (13) connecting the tips of the contact portions (12). Have
The abutting portion (12) and the bridging portion (13) are externally fitted to the taper member (7), and the tip of the rod (4) faces the tip surface (4a) of the rod (4). The anchor bolt is inserted into the mounting hole (2) through the insertion hole (14) provided in the main body part (13a) of the bridging portion (13), and the tip surface (4a) of the rod (4) is Abut the back surface (2b) of the mounting hole (2),
The taper member (7) is screwed by rotating the rod (4) with the tip surface (4a) of the rod (4) in contact with the back surface (2b) of the mounting hole (2) as a fulcrum. It moves to the opening side of the mounting hole (2) by the action, thereby moving each contact portion (12) to the inner peripheral surface (2a) side of the mounting hole (2), and the contact portion (12). Is pressed against the inner peripheral surface (2a) of the mounting hole (2) to fix the anchor bolt to the mounting hole (2). When the anchor bolt is inserted into the mounting hole (2), the bridging portion (13) and the outer peripheral surface (15) of the abutting portion (12) are moved by the elastic restoring force of the bridging portion (13). 2. The anchor bolt construction method according to claim 1, wherein the anchor bolt is pressed against the inner peripheral surface (2a) of the mounting hole (2).