TWI634270B - Anchor bolt - Google Patents

Abstract

The present invention provides an anchor bolt which can reduce the assembly labor time and the like even if the bolt body is long.

The anchor bolt 1 of the present invention is fixed to the hole 3 of the wall surface 2 such as concrete, and the anchor bolt 1 has a push-out member 8 formed with a female thread 7 screwed to the male thread 4 of the bolt body 5; The expansion member 9 is externally fitted to the push-out member 8; the expansion member 9 has two abutment portions 12 coupled to the bridge portion 13. The inclined surface 10 of the push-out member 8 and the inner surface 14 of the abutting portion 12 that is in surface contact with the inclined surface 10 are inclined so as to be closer to the central axis of the bolt body 5 toward the proximal end side of the bolt body 5 . The push-out member 8 is divided into two push-out pieces 8a, 8b, and the bolt body 5 is fitted inside the two push-pull pieces 8a, 8b in an open state to close the push-pull pieces 8a, 8b, thereby pushing the push-out member 8 The female thread 7 is screwed to the male thread 4 of the bolt body 5. The push-pull pieces 8a, 8b of the closed posture are locked by the locking pin 26.

Description

Anchor bolt

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

For example, as disclosed in Patent Document 1, a technique in which a hole is formed in a rock wall or the like using a drill or the like, and an anchor bolt is inserted into the hole and fixed.

In particular, the anchor bolt of Patent Document 1 is such that the C-shaped outer casing whose inner surface is inclined to have a conical shape is engaged with the conical member whose diameter is closer to the front end surface (the right side in the second drawing of Patent Document 1). Weekly. Moreover, the male thread formed as a rod is screwed into the female thread provided along the central axis of the aforementioned conical member.

Then, after the anchor bolt is inserted into a hole opened in a rock wall or the like, the rod is rotated, and a pulling force in a direction in which the hole is drawn out from the hole is applied to the cone member. Thereby, the conical member moves toward the opening side of the hole (the left side in the second drawing of Patent Document 1), and the circumferential surface of the conical member pushes the outer casing toward the inner peripheral surface side of the hole, and the outer peripheral surface of the outer casing The anchoring bolt is held (fixed) to the rock wall or the like by being pushed against the inner peripheral surface of the hole.

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 54-159553

In the anchor bolt of Patent Document 1, the conical member and the outer casing are disposed only at the tip end of the rod, and the anchor bolt and the outer casing are fixed to the rock wall or the like by the set of conical members and the outer casing, and thus the anchoring may not be sufficiently performed. The aforementioned fixed considerations of the bolts.

Further, in the anchor bolt of Patent Document 1, the rod member is formed to be long due to the purpose of use (see the first drawing of Patent Document 1), but as described above, the cone is disposed only at the tip end of the rod member. In the case of the member and the outer casing, there is a concern that the lever member swings with the outer casing as a fulcrum.

According to the countermeasure, it is conceivable that the male screw is formed integrally with the rod, and the conical member and the outer casing are disposed at an intermediate position in the longitudinal direction of the rod (bolt body), but the anchor bolt is assembled. It is necessary to perform the operation of rotating the conical member or the rod to move the conical member from the front end of the rod to the aforementioned intermediate position, and it is necessary to labor and time to rotate the conical member or the rod when assembling the anchor bolt.

The present invention has been made in an effort to solve the disadvantage, and an object thereof is to provide an anchor bolt which can reduce assembly labor time and the like even if the bolt body is long.

In order to solve the problem, the present invention is an anchor bolt 1 fixed to a hole 3 provided in a wall surface 2, the anchor bolt having a bolt body 5 formed with a male thread 4 on a cylindrical outer peripheral surface; a push-out member a taper member 8 is formed with a female thread 7 screwed to the male thread 4 of the bolt body 5 along a central axis; and a flared member 9 externally fitted to the push-out member 8; the flared member 9 A plurality of abutting portions 12 are provided, and the plurality of abutting portions 12 are provided with abutting faces 14 that abut against a plurality of inclined faces 10 formed on the circumferential side faces of the push-out members 8; each of the expanding members 9 The abutting surface 14 of the abutting portion 12 and the inclined surface 10 of the push-out member 8 are closer to the central axis of the bolt body 5 as they approach the proximal end side of the bolt body 5 in the abutting state. The manner of tilting; the push-out member 8 is divided into two push-out pieces 8a, 8b by two divided faces 23, 24 extending in the axial direction thereof; the two push-pull pieces 8a, 8b are configured to be swingable 25 is opened and closed for centering, and is formed such that the bolt body 5 is fitted inside the two push-out pieces 8a, 8b in an open state. Closing the push-pull pieces 8a, 8b, thereby screwing the female thread 7 of the push-out member 8 to the male thread 4 of the bolt body 5; and arranging a lock for locking the push-pull pieces 8a, 8b in the closed position Solid components.

Here, the wall surface 2 includes a civil structure such as a rock wall or a tunnel, or a wall surface such as a ceiling or a side wall of the building. The swing shaft 25 includes a case in which the members of the push-pull sheets 8a and 8b are independent, and a case in which they are integrated with either of the push-pull sheets 8a and 8b. Pins and bolts are equivalent to locking members. The abutting portions 12 of the expanding member 9 are compared with the inclined faces 10 of the pushing member 8 Preferably, each of the phases is inclined at the same angle in the abutting state.

Here, the C-ring or the ring-shaped spring or the like is externally fitted to the outer peripheral surface of the abutting portion 12, and the abutting surface 14 of the abutting portion 12 abuts against the inclined surface 10 of the push-out member 8. The closed posture refers to a posture in which the female threads 7 of the push-pull pieces 8a, 8b are respectively screwed to the male threads 4 of the bolt body 5.

Further, the expansion member 9 may be formed to have a bridge portion 13 having a through hole 19 through which the bolt body 5 can be inserted, and the abutment portion 12 may be coupled to the bridge portion 13.

The expansion member 9 can be formed at a position separated by the through hole 19 of the bridge portion 13, and at least one abutting portion 12 is connected to the bridge portion 13 of each of the divided expansion members 9.

In the anchor bolt 1 of the present invention, the anchor bolt 1 is inserted into the hole 3 of the wall surface 2 to rotate the bolt body 5 (rotate), whereby the abutting surface 14 of the abutting portion 12 of the expanding member 9 is pushed The inclined surface 10 of the member 8 is pushed toward the inner peripheral surface 16 side of the hole 3, and the outer peripheral surface 15 of the abutting portion 12 is crimped to the inner peripheral surface 16 of the hole 3 (for example, in surface contact) Push in the state). Thereby, the anchor bolt 1 can be surely fixed to the hole 3 by the friction between the outer peripheral surface 15 of the abutting portion 12 and the surface of the inner peripheral surface 16 of the hole 3, and the anchor bolt 1 can be surely prevented. It falls off from the aforementioned hole 3.

Further, when the bolt body 5 is pulled to the outside of the hole 3, the inclined surface 10 of the push-out member 8 presses the abutting surface 14 of the abutting surface 12 of the expanding member 9 more strongly, so the abutment The outer peripheral surface 15 of the face 12 will The inner peripheral surface 16 of the aforementioned hole 3 is crimped more strongly. Thereby, the anchor bolt 1 can be more reliably prevented from coming off the aforementioned hole 3.

Further, since the push-out member 8 is composed of two push-pull sheets 8a and 8b, the bolt body 5 is fitted inside the two push-pull sheets 8a and 8b in an open state, and is pushed. The female thread 7 of the pulling member 8 is screwed to the male thread 4 of the bolt body 5 to close the push-pull pieces 8a, 8b, and the push-pull pieces 8a, 8b of the closed posture are locked by the locking member, and The push member 8 is surely mounted to the bolt body 5. Thereby, even if the bolt main body 5 is long, the push-out member 8 can be easily attached to the intermediate position of the bolt main body 5 in the longitudinal direction. As a result, the assembly labor time of the anchor bolt 1 and the like can be reduced, and the efficiency of assembly can be improved.

When the abutting portion 12 is coupled to the bridge portion 13 of the expansion member 9 having the through hole 19, the bridge portion 13 and the abutting portion 12 can be integrally treated. That is, when the bolt body 5 is inserted into the through hole 19 of the bridge portion 13, and the bridge portion 13 is moved to the position of the push-out member 8 screwed to the bolt body 5, the abutment portion 12 also moves together. The push-out member 8 can be externally fitted, and the treatment of the abutting portion can be made easier by comparing, for example, a case where the plurality of abutting portions 12 are separately formed.

When the expansion member 9 is divided at the position of the through hole 19 of the bridge portion 13, the expansion members 9 are externally fitted to the push member 8 such that the abutment portion 14 of the abutment portion 12 of each of the expansion members 9 Opposing the inclined faces of the push-out member 8 respectively, and inserting the bolt body 5 into the through-hole 19 of the bridge portion 13 of each of the expansion members 9 to join the expansion members 9 to each other, thereby being mounted even on Pushing and pulling of the center position of the bolt body 5 in the longitudinal direction The member 8 can also be easily provided with the expansion member 6.

1, 21‧‧‧ anchor bolts

2‧‧‧ wall

3‧‧‧ hole

4‧‧‧ male thread

5‧‧‧Bolt body

6‧‧‧Expanding institutions

7‧‧‧Female thread

8‧‧‧ Pushing members

8a, 8b‧‧‧ push tablets

9‧‧‧Expanding components

10‧‧‧Sloping surface

12‧‧‧Apartment

13‧‧‧Bridge Department

14‧‧‧ inner surface

15, 22‧‧‧ outer perimeter

16‧‧‧ inner circumference

18‧‧‧ Central Department

19‧‧‧through hole

20‧‧‧ trench

23, 24‧‧ ‧ split face

25‧‧‧ axle pin

26‧‧‧Locking pin

27‧‧‧through holes

28‧‧‧ bracket

29‧‧‧ Nuts

31‧‧‧ bolt

32‧‧‧ nuts

33‧‧‧ wall thickness

34‧‧‧ gap

35‧‧‧Insert through hole

Fig. 1 is a perspective view showing an important part of the anchor bolt of the first embodiment of the present invention.

Fig. 2 is an exploded perspective view showing the anchor bolt of the first embodiment.

Fig. 3 is a perspective view showing a push-out member of the anchor bolt of the first embodiment.

Fig. 4 is a cross-sectional view taken along the line A-A of Fig. 2 for explaining the mounting order of the push member of the first embodiment to the bolt body.

Fig. 5 is a cross-sectional view taken along line A-A of Fig. 2, showing a state in which the push member of the first embodiment is attached to the bolt body.

Fig. 6 is a cross-sectional view showing a state in which the anchor bolt is attached to the hole.

Fig. 7 is a cross-sectional view taken along the line A-A of Fig. 2 for explaining the mounting order of the push member of the second embodiment to the bolt body.

Fig. 8 is a cross-sectional view corresponding to the arrow A-A of Fig. 2, showing the state in which the push member of the second embodiment is attached to the bolt body.

A first embodiment of the anchor bolt of the present invention will be described with reference to Figs. 1 to 6 . As shown in Fig. 6, the anchor bolt of the present invention is fixed (held) in a state of being inserted into (provided) a wall surface 2 such as a concrete ceiling.

As shown in FIGS. 1 to 6, the anchor bolt 1 has a bolt body 5 which is substantially the entire circumference of the outer peripheral surface of the cylindrical surface. The field is formed with a male thread 4; and the expansion mechanism 6 is disposed at at least one of a front end (upper end in FIG. 6) and an intermediate portion of the bolt body 5 in the longitudinal direction. A device, a pipe, and the like (not shown) are fixed to the base end (lower end in FIG. 6) of the bolt body 5.

The expansion mechanism 6 includes a push-out member 8 that forms a female thread 7 for screwing with the male screw 4 of the bolt body 5 along a central axis (see FIG. 3); and a flare member 9 The push member 8 is externally embedded. As shown in FIGS. 2 and 3, the push-out member 8 is formed in a columnar shape. Further, on the left and right sides of the circumferential side surface of the push-out member 8, a plane-shaped inclined surface 10 is provided, which is closer to the bolt as it goes toward the base end of the bolt body 5 (push-out member 8). The center axis of the body 5 is inclined (see Fig. 6).

As shown in FIGS. 2 and 6, the expansion member 9 has a bridge portion 13 having a through hole 19 through which the bolt body 5 can be inserted, and two abutting portions 12 facing the push-out member. Each of the inclined faces 10 of the eight is disposed in a rightward and opposite directions. The inner surface (abutment surface) 14 of each abutting portion 12 of the expanding member 9 is formed in a planar shape so that the inner surface 14 of each abutting surface 12 can be in surface contact with each inclined surface 10 of the push-out member 8 ( Abut). The inner surface 14 of each abutting portion 12 is inclined in such a manner as to be closer to the central axis of the bolt body 5 as it goes toward the base end of the bolt body 5, and the inner surface of the abutting portion 12 is in the abutting state. The inclination angle of 14 is substantially equal to the inclination angle of each inclined surface of the push-out member 8.

The outer peripheral surface 15 of each of the abutting portions 12 of the expanding member 9 is formed in a cylindrical shape, and the outer peripheral surface 15 is formed with the inner peripheral surface 16 of the aforementioned hole 3. The surface is crimped (pushed in the state of surface contact) (refer to Figure 6).

As shown in FIG. 2, the bridge portion 13 of the expansion member 9 is formed in a disk shape in the center portion 18 in the left-right direction, and the through hole 19 is formed in the center portion. The push-out member 8 and the expansion member 9 of the anchor bolt 1 are each formed of stainless steel or the like. The expansion member 9 is elastically deformable, and the left and right abutting portions 12 and 12 are respectively swung in the left-right direction. Further, the through hole 19 may not be formed in the bridge portion 13 of the expansion mechanism 6 disposed at the distal end of the bolt body 5 in the longitudinal direction. Further, the left and right abutting portions 12 and 12 may be slightly opened in the left-right direction.

A plurality of grooves (three in the present embodiment) are formed in the longitudinal direction of the bolt body 5 at equal intervals on the proximal end side of the outer peripheral surface 15 of each of the abutting portions 12 of the expanding member 9, The groove 20 extends in the circumferential direction of the outer peripheral surface 15 of each of the abutting portions 12 . When the anchor bolt 21 is inserted into the aforementioned hole 3, for example, the edge of the groove 20 may hook the inner peripheral surface of the aforementioned hole 3, and the anchor bolt 1 is prevented from coming off the hole 3.

As shown in Fig. 3, each of the push-out members 8 of the anchor bolt 1 is divided into two push-out pieces 8a, 8b by two divided faces 23, 24 extending in the longitudinal direction (axial direction) (half-divided ). In detail, the divided faces 23, 24 are formed in the outer peripheral faces 22, 22 of the cylindrical faces which are sandwiched by the inclined faces 10, 10 in the outer peripheral surface of the push-out member 8, toward the push-out member 8 The axial direction extends and extends parallel to the radial direction of the push-out member 8. Further, the divided faces 23 and 24 are each bent in a stepped shape at the center in the longitudinal direction of the push-out member 8.

The push member 8 is configured to extend over the push structure A cylindrical pin 25 between the ends of the member 8 in the longitudinal direction. The shaft pin 25 passes through a stepped portion of one of the divided faces 23, and the push-pull pieces 8a and 8b are swingably opened and closed with the shaft pin 25 as an axis (see FIG. 4), and the shaft pin 25 can be used. The link is not separable. Further, the push-out member 8 is formed with a columnar through hole 27 extending through both ends in the longitudinal direction of the push-out member 8 (see FIG. 5), and the through hole 27 passes through the other divided surface 24 The ladder part. In the through hole 27, a cylindrical locking pin (locking member) 26 for locking the push-pull pieces 8a and 8b in a closed posture (the posture of Fig. 5) is inserted. The locking pin 26 is detachable from the push member 8.

Next, an example of the assembly procedure of the anchor bolt 1 will be described. First, in a state where the lock pin 26 is removed from the through hole 27 of the push-out member 8 of the expansion mechanism 6, the pushing of the push-out member 8 is performed. The tabs 8a, 8b are opened left and right as shown in Fig. 4.

Next, the push-pull pieces 8a and 8b are closed while the female screw of the push-out member 8 is screwed to the male screw 4 of the bolt main body 5, so that the intermediate position in the longitudinal direction of the bolt main body 5 is fitted in the open state. The inside of the two push-pull sheets 8a, 8b. The locking pin 26 is inserted into the through hole 27 of the push-pull pieces 8a, 8b in the closed posture (the posture of Fig. 5), and the push-pull pieces 8a, 8b are locked in the closed posture. Thereby, the push-out pieces 8a and 8b which prevent the closed posture are opened and are detached from the bolt body 5.

After the push-out pieces 8a, 8b (push-out members 8) are mounted to the intermediate position of the bolt body 5, the front end of the bolt body 5 is passed through the through-hole 19 of the expansion member 9, and the expansion member 9 is moved to the installation. Above the snail The position of the push-out member 8 of the main body is inserted so that the expansion member 9 is externally fitted to the push-out member 8 (the state of Fig. 1) so that the inner surface 14 of each abutment portion 12 of the expansion member 9 can be pushed and pushed The inclined faces 10 of the members 8 are in surface contact. In the same manner, each of the expansion mechanisms 6 is attached (arranged) to the distal end of the bolt body 5 in the longitudinal direction and other intermediate positions.

Then, the anchor bolt 1 is inserted into the hole 3 of the wall surface 2 of the concrete with the front end side facing upward, and inserted into the depth of the hole 3 (refer to Fig. 6). Next, the bolt body 5 is pulled toward the proximal end side of the hole 3, whereby the bolt body 5 and the push-out member 8 of each expansion mechanism 6 are lowered (moved) to the proximal end side of the hole 3 of the wall surface 2. At this time, the end portion on the proximal end side of each of the abutting portions 12 of the expanding member 9 or the edge portion of the groove 20 is hooked to the inner peripheral surface 16 of the hole 3, thereby restricting the downward movement of the expanding member 9.

In this state, the inner surface 14 of each abutting portion 12 is pressed toward the inner peripheral surface 16 side of the hole 3 by the inclined surfaces 10 of the push-out member 8, and the outer peripheral surface 15 of each abutting portion 12 is in the surface. The crimping, that is, the surface contact, is pushed against the inner peripheral surface 16 of the hole 3. Thereby, the anchor bolt 1 is fixed to the hole 3 by the friction between the outer peripheral surface 15 of each abutting portion 12 and the inner peripheral surface 16 of the hole 3.

As shown in Fig. 6, a bracket 28 for fixing a device or a pipe (not shown) or the like is attached to the male screw 4 of the bolt body 5 of the anchor bolt 1, and the nut 29 is screwed (mounted). On the underside of the bracket 28. Then, the nut 29 is rotated by a tool such as a wrench or a spanner, and the nut 29 is pushed against the lower edge of the hole 3 via the bracket 28 side. Further, the nut 29 is further rotated, whereby the bolt body 5 is pulled downward by the nut 29, and the bolt body 5 and the push-out member 8 of each expansion mechanism 6 are further toward the base end side of the hole 3. For the decline.

Thereby, the inner surface 14 of each abutting portion 12 is further pressed toward the inner peripheral surface 16 side of the hole 3 by the inclined faces 10 of the push-out member 8, and the outer peripheral faces 15 of the respective abutting portions 12 are The inner peripheral surface of the hole 3 is strongly pressed against the ground and the anchor bolt 1 is more reliably fixed to the hole 3, and the anchor bolt 1 can be surely prevented from coming off the hole 3. Further, instead of the bracket 28, a spacer (not shown) or the like may be attached to the upper side of the nut 29.

Even if the bolt body 5 that has been fixed to the anchor bolt 1 of the hole 3 is pulled downward due to the weight (external force) of the equipment or the like, the push-out member 8 strongly presses the abutment portions 12 accordingly. Since the inner peripheral surface 14 is formed, the outer peripheral surface 15 of each abutting portion 12 is also strongly pressed against the inner peripheral surface 16 of the hole 3. Thereby, the anchor bolt 1 can be surely prevented from falling out of the hole 3.

In this manner, since the locking pins 26 are inserted into the through holes 27 of the push-pull sheets 8a and 8b, the push-pull sheets 8a and 8b can be locked in the closed posture, so that the locking work can be easily performed. Further, in place of the lock pin 26, for example, a screw may be locked into the through hole 27 of the push-pull sheets 8a and 8b, and the push-pull sheets 8a and 8b may be locked in a closed posture.

Next, a second embodiment of the anchor bolt 1 of the present invention will be described based on Figs. 7 and 8. In the second embodiment, the side of the divided surface 23 of one of the two push-pull pieces 8a and 8b of the anchor bolt 1 is configured to be swingable about the axis of the shaft pin 25 as in the first embodiment. One On the other hand, the bolt 31 and the nut 32 as the lock members are used to lock the other side of the split surface 24 of the push-out sheets 8a and 8b. That is, the push-pull pieces 8a, 8b, which are prevented from being closed by the bolts 31 and the nut 32, are opened to be detached from the bolt body 5.

In detail, the other divided surface 24 of the push-out member 8 extends straight in the axial direction of the push-out member 8 and extends in parallel with the radial direction of the push-out member 8. Further, on the outer peripheral surface 22 of the push-out member 8 on which the other split surface 24 is formed, notches 34 and 34 are formed on the left and right sides of the other split surface 24 via the thick portions 33 and 33, respectively.

The head of the bolt 31 and the nut 32 are placed in the notches 34 and 34, respectively (state of Fig. 8). Thereby, the head or the nut 32 of the bolt 31 is prevented from coming into contact with the inner peripheral surface 16 of the hole 3. In the wall thickness portions 33 and 33, an insertion hole 35 extending in the left-right direction is formed, and the shaft of the bolt 31 is inserted into the insertion hole 35.

Next, an example of the assembly procedure of the anchor bolts 1 of the second embodiment will be described. As shown in Fig. 7, the two push-pull pieces 8a and 8b of the push-out member 8 are opened to the right and left. The female screw of the pulling member 8 is screwed to the male screw of the bolt main body 5, and the push-pull sheets 8a and 8b are closed so that the intermediate position of the bolt main body 5 in the longitudinal direction is fitted inside the push-pull sheets 8a and 8b. The bolt 31 is inserted into the insertion hole 35 of the push-pull pieces 8a and 8b in the closed posture (the posture of Fig. 8), and the nut 32 is locked into the end of the shaft of the bolt 31 (the state of Fig. 8). Thereby, the push-pull sheets 8a, 8b are locked in the aforementioned closed posture.

Then, in the same manner as in the first embodiment, the snail is made. The front end of the plug body 5 is externally fitted to the push-out member 8 attached to the bolt body 5 by the through hole 19 of the expansion member 9, and the anchor bolt 1 is inserted with the front end side facing upward. Inside the hole 3, the bolt body 5 is pulled toward the proximal end side of the hole 3 and locked into the nut 29 (see Fig. 6), whereby the anchor bolt 1 is fixed to the hole 3. Other configurations and operations are the same as those of the first embodiment, and thus the description thereof is omitted.

In this manner, since the bolt 31 is inserted into the insertion hole 35 of the push-pull pieces 8a and 8b in the closed posture, and the nut 32 is locked in the bolt 31, the posture of closing the push-pull sheets 8a and 8b can be surely maintained.

The expansion member 9 may be divided at the position of the through hole 19 of the bridge portion 13, and the front end side of the contact portion 12 may be coupled to the bridge portion 13 of each of the divided expansion members 9 respectively. At this time, the inner surface 14 of the abutting portion 12 of each of the divided expanding members 9 is brought into surface contact with the inclined surface 10 of the drawing member 8 from the left and right sides of the pushing member 8, and the bolt body 5 is placed. The through holes 19 of the bridge portions 13 of the respective expanding members 9 are fitted, and the respective expanding members 9 are externally fitted to the pushing members 8.

Thereby, even if it is the push-out member 8 installed in the center position of the longitudinal direction of the bolt main body 5, the expansion member 9 can be easily externally inserted. At this time, the two expansion members 9 that are externally fitted to the push-out member 8 are preferably attached to the outer peripheral surface 15 of the abutting portion 12, for example, by a C-ring or the like so as to be inseparable.

Each of the abutting portions 12 of the expanding member 9 may be formed to be apart from the bolt body 5 as it goes toward the free end side (the right side in the first drawing: the base end side) of the abutting portion 12. At this time, the expansion member 9 is elastically deformed when the anchor bolt 1 is inserted into the hole 3, and the freedom of the abutment portion 12 is made. When the end side is close to the bolt body 5 side, the hole 3 is inserted into the hole 3, and the free end side of the abutting portion 12 is pushed against the inner peripheral surface 16 of the hole 3 by the elastic restoring force at this time, so that the bolt body 5 is turned toward When the base end side (the lower side in FIG. 6) of the hole 3 is pulled when pushed, the free end side of the abutment portion 12 will hook the inner peripheral surface 16 of the hole 3, and the expansion member 9 is prevented from being pushed along with the push-out member. 8 moves toward the base end side of the hole 3.

Thereby, when the push-out member 8 moves toward the proximal end side of the hole 3, the inclined surface 10 of the push-out member 8 can be reliably pushed against the inner surface 14 of the abutting portion 12, and the outer periphery of the abutting portion 12 can be made. The face 15 is surely pressed against the inner peripheral surface 16 of the hole 3. In the case of the locking member, it may be a member other than the first embodiment or the second embodiment.

It is also possible to form the inclined surface 10 of three or more sides in the push-out member 8 of each expansion mechanism 6. For example, when the inclined surface 10 is formed on the four sides of the push-out member 8, the split faces 23 and 24 are formed on the opposite faces (opposing faces) of the four inclined faces 10, 10, respectively.

When the push-pull pieces 8a, 8b are not required to be swung, the lock pin 26 can be inserted into the hole for the shaft pin 25, and the shaft pin 25 can be omitted. At this time, the through hole 27 through which the lock pin 26 is inserted may also extend in the vertical direction with respect to the longitudinal direction of the push-out member 8. In addition, bolts and nuts can be used instead of the locking pin 26.

Claims (5)

An anchor bolt is fixed to an anchor bolt (1) disposed in a hole (3) of a wall surface (2), the anchor bolt having a bolt body (5) formed with a male thread on a cylindrical outer peripheral surface ( 4); the pushing member (8) is formed with a female thread (7) screwed to the male thread (4) of the bolt body (5) along the central axis; and the expanding member (9) is externally embedded The pushing member (8); the expanding member (9) has a plurality of abutting portions (12), and the plurality of abutting portions (12) are provided and formed on the pushing member (8) Abutting surface (14) on which a plurality of inclined surfaces (10) abut on the side surface; abutting surface (14) of each abutting portion (12) of the expanding member (9), and the pushing member ( 8) each inclined surface (10) is inclined in such a manner as to be closer to the central axis of the bolt body (5) toward the proximal end side of the bolt body (5) in the abutting state; The member (8) is disposed at an end portion and an intermediate position in the longitudinal direction of the bolt body (5), and the push-out member (8) disposed at the intermediate position is formed by two divided faces extending in the axial direction thereof ( 23), (24) and divided into two push pieces ( 8a), (8b); and formed by inserting the bolt body (5) inside the two push-out pieces (8a) and (8b) in an open state to close the push-pull pieces (8a), (8b) Thereby, the female thread (7) of the push-out member (8) is screwed to the male thread (4) of the bolt body (5); and is configured to lock the push-pull piece in the closed posture. (8a), (8b) locking members. The anchor bolt according to claim 1, wherein the two push-out pieces (8a) and (8b) are configured to be swingable by opening and closing around the swing shaft (25). The anchor bolt according to the first or second aspect of the invention, wherein the expansion member (9) has a bridge portion (13) having a through hole (19) through which the bolt body (5) can be inserted. And the abutting portion (12) is coupled to the bridge portion (13). The anchor bolt according to claim 3, wherein the expansion member (9) is divided at a position of the through hole (19) of the bridge portion (13), and can be embedded from the side. In the push-out member (8) at the intermediate position, at least one of the abutting portions (12) is connected to the bridging portion (13) of each of the divided expanding members (9). The anchor bolt according to claim 4, wherein the member that does not separate the divided expanding member (9) is externally fitted to the abutting portion (12) of the expanding member (9). Outer peripheral surface (15).