TWI682102B - Anchor bolt - Google Patents

Abstract

The anchor bolt (30) caused by the present invention is inserted into the hole (2) provided in the wall surface (1) and fixed. An expansion member (8) is embedded outside the tapered member (7) connected to the rod (3). An inclined surface (11) is provided on the outer peripheral surface of the tapered member (7). The expansion member (8) is provided with: an abutment portion (12) having an inner surface (14) in surface contact with the inclined surface (11) of the tapered member (7), and a body portion (13a) and The bridge part (13) of the connection part (13b). The connection part (13b) is extended from the edge of the body part (13a) toward the outside of the bridge part (13) in an oblique direction, and then toward the bridge part (13) before the middle of the longitudinal direction The inner side is bent, and then connected to the front end of the contact portion (12). When the anchor bolt (30) is inserted into the hole (2), the middle part of the connection part (13b) is pushed to the edge of the opening of the hole (2) or the inner peripheral surface (4) of the hole (2) At the same time, it is elastically deformed. The middle part of the connection part (13b) and the abutment part (12) are pressed against the inner circumferential surface (4) of the hole (2).

Description

Anchor bolt

The present invention relates to an anchor bolt fixed in a hole provided in a wall surface such as a stone wall or a concrete floor or a top surface.

As an anchor bolt, for example, as shown in Patent Document 1, a hole (hole) is drilled using a drill or the like on a concrete floor or the like, and the anchor bolt is inserted into the hole for fixing. Well known.

In detail, the anchor bolt of Patent Document 1 includes: a pair of left and right wedges formed so that the closer to the front end side (the lower side in FIG. 1 of Patent Document 1), the further from the anchor The wedge surface of the inclined surface away from the center axis of the bolt; and a pair of left and right anti-falling members, formed on the inner side of the wedge surface that is in contact with the wedge surface of the wedge body; The lower ends of the anti-falling members are connected (connected) to each other.

However, after inserting the anchor bolt into the hole drilled in the concrete floor, etc., by tightening the nut to the screw fixed at the upper end of the wedge body, the wedge system rises, the The wedge surface of the wedge body pushes the reverse wedge surface of the anti-shedding member. With this, the two anti-falling members are Expanding toward the horizontal direction (lateral direction), the outer peripheral surface of the anti-dropping member is pressed against the inner peripheral surface of the hole in a surface contact state, by the outer peripheral surface of the anti-dropping member and the inner peripheral surface of the hole Between the frictional forces, the anchor bolts are fixed in the aforementioned holes.

In addition, in the anchor bolt of Patent Document 1, as shown in FIG. 1 of Patent Document 1, irregularities are formed on the outer peripheral surface of the aforementioned anti-falling member, and the irregularities grasp the inner periphery of the hole To prevent the fall-off prevention member from rising as the wedge rises.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Shikai Sho 49-49364

In addition, in the anchor bolt of the aforementioned Patent Document 1, when the wedge body starts the ascent, or the force caused by the outer peripheral surface of the anti-drop member against the inner peripheral surface of the hole becomes weak, the anti-proof The irregularities on the outer peripheral surface of the shedding member may become difficult to grasp the inner peripheral surface of the hole. As a result, there is a possibility that the rise of the anti-falling member cannot be reliably suppressed as the wedge rises. In this case, the anchor bolt may be pulled out from the hole.

The present invention is provided for the purpose of solving the above-mentioned problems, and provides a method that can be reliably fixed in a hole provided in a wall surface Anchor bolts.

The present invention is a solution to the above-mentioned problems, and is an anchor bolt 30 that is inserted into a hole 2 provided in a wall surface 1 for fixing and is characterized by a tapered member connected to a rod 3 The expansion member 8 is embedded in 7 places, and the outer peripheral surface of the tapered member 7 is formed with an inclined surface 11 that inclines so as to approach the center axis of the tapered member 7 toward the base end side, and expands The member 8 includes a contact portion 12 formed with an inclined inner surface 14 that can make surface contact with the inclined surface 11 of the tapered member 7, and an elastic deformation capable of being connected to the contact portion 12 The bridging portion 13 includes a body portion 13a disposed on the front end side of the tapered member 7, and a body portion 13a extending from the edge of the body portion 13a toward the abutting portion 12 side and in contact with the abutting portion 12 The connection part 13b for the front end is connected, and the connection part 13b is extended from the edge of the body part 13a toward the outside of the bridging part 13 in an oblique direction, first toward the bridging in the middle of the long side direction The inner side of the portion 13 is bent and then connected to the front end of the abutment portion 12, when the anchor bolt 30 is inserted into the hole 2, the middle portion of the connection portion 13b is pushed to the edge of the opening of the hole 2 Or, the inner peripheral surface 4 of the hole 2 is elastically deformed, and by this elastic restoring force, the middle portion or the abutting portion 12 of the connection portion 13b is pressed against the inner peripheral surface 4 of the hole 2.

Here, the wall surface 1 is a wall surface including a civil or civil structure such as a tunnel or a concrete top surface or side wall or ground surface of a building, or It is the rock wall and so on. The inclined surface 11 of the tapered member 7 and the inner surface 14 of the contact portion 12 may also be slightly curved. The rod 3 and the tapered member 7 may be connected by being integrally formed, or may be a female screw 9 provided at the rod 3 to the female member provided at the tapered member 7 The thread 6 connects the tapered member 7 and the rod 3.

Here, the case where the inner surface 14 of the contact portion 12 of the expansion member 8 is in contact with the inclined surface 11 of the tapered member 7 in the free state before the anchor bolt 30 is inserted into the hole 2, In the aforementioned free state, the inner surface 14 of the contact portion 12 is separated from the inclined surface 11 of the tapered member 7, and when the anchor bolt 30 is inserted into the hole 2, the inside of the contact portion 12 of the expansion member 8 The surface 14 is in contact with the inclined surface 11 of the tapered member 7. The connection portion 13b may be bent into a curved shape (arc shape). The bridge portion 13 only needs to be capable of elastic deformation at least at the connection portion 13b. Here, when the anchor bolt 30 is inserted into the hole 2, as long as at least one of the middle portion of the connecting portion 13b and the abutting portion 12 is pushed against the inner peripheral surface 4 of the hole 2, can.

Specifically, at the outer peripheral surface of the tapered member 7, at least a pair of inclined surfaces 11, 11 are formed. The aforementioned pair of inclined surfaces 11, 11 are arranged at positions facing each other, and the abutment portion 12, At least one pair is arranged corresponding to the aforementioned pair of the inclined surfaces 11, 11. The connecting portion 13b of the bridge portion 13 is provided at least one pair corresponding to the aforementioned pair of the abutment portions 12, 12. In the free state before 30 is inserted into the hole 2, the distance L3 between the bending places of the paired connection portions 13b, 13b is configured to be larger than the diameter L1 of the hole 2.

Here, it includes the case where the number of pairs of inclined surfaces 11 and the number of pairs of contact portions 12 and connecting portions 13b coincide with each other, and for example, the number of pairs of inclined surfaces 11 is lower than that of the contact portions 12 and connecting portions 13b The number of pairs and more cases etc. The distance L3 between the bending locations of the connection portions 13b and 13b of the aforementioned pairs includes all the widthwise directions at the bending locations of the connection portions 13b and 13b of the pairs, which are all smaller than those of the hole 2 The case where the diameter L1 is larger, and the case where at least a part of the width direction at the bending place of the connecting portions 13b and 13b of each pair becomes larger than the diameter L1 of the hole 2.

It can be configured as follows: it is provided with a cylindrical holder 16 capable of inserting the rod 3 of the anchor bolt 30, and the holder 16 becomes the opening side of the hole 2 when inserted into the hole 2 At the end of the, a protruding portion 16a protruding in the lateral direction is provided, and the outer diameter of the protruding portion 16a is set to be larger than the diameter L1 of the hole 2. The protruding portion 16a includes a case where the entire area of the circumferential surface of the holder 16 is provided and a case where only a part of the circumferential surface of the holder 16 is provided.

The system may be configured such that a holding portion 24 is formed at an intermediate position in the longitudinal direction of the rod 3, and the holding portion 24 is arranged when the anchor bolt 30 is inserted into the hole 2 and fixed It becomes the position in the hole 2. The outer diameter of the holding portion 24 includes a case equal to the diameter L1 of the hole 2 and a case slightly smaller than the diameter L1 of the hole 2.

The anchor bolt 30 of the present invention is inserted into the hole of the wall surface 1 At 2, when the connecting portion 13b of the bridging portion 13 of the expansion member 8 abuts against the edge of the opening of the hole 2, by forcibly pushing the anchor bolt 30 into the hole 2, the aforementioned connecting portion 13b is Due to the elastic deformation, the expansion member 8 enters the hole 2. Due to the elastic restoring force of the connecting portion 13b at this time, the middle portion of the connecting portion 13b of the expansion member 8 and the abutting portion 12 are pressed against the inner peripheral surface 4 of the hole 2, due to friction and the like at this time The expansion member 8 is firmly held at the inner peripheral surface 4 of the hole 2. As a result, when the tapered member 7 moves toward the opening side of the hole 2 together with the rod 3, the expansion member 8 and the tapered member 7 are caused by the contact of the tapered member 7 with the contact portion 12 The ground is moved toward the opening side of the hole 2, so that the inclined surface 11 of the tapered member 7 becomes difficult to press the inner surface 14 of the contact portion 12 of the expansion member 8. By this, the inclined surface 11 of the tapered member 7 can be firmly pressed against the inner surface 14 of the contact portion 12 of the expansion member 8, and the outer peripheral surface 15 of the contact portion 12 can be reliably Pressing against the inner peripheral surface 4 of the hole 2, the friction between the outer peripheral surface 15 of the contact portion 12 and the inner peripheral surface 4 of the hole 2 can reliably fix the anchor bolt 30 to the hole 2 in.

If at least one pair of connecting portions 13b, 13b of the abutting portions 12, 12 and the bridge portion 13 facing each other is provided, the pair of connecting portions 13b, 13b and the abutting portions 12, 12 become the inner periphery of the hole 2 The opposing places of the surface 4 are pushed from opposite directions respectively, and by this reaction force, the expansion member 8 is held while keeping the central axis of the expansion member 8 slightly along the central axis of the hole 2 In the inner peripheral surface of the hole 2 at 4 places. By this, the outer peripheral surface 15 of each contact portion 12 of the expansion member 8 can be slightly equalized The inner peripheral surface 4 of the hole 2 is pushed and abutted by the like, and the anchor bolt 30 can be appropriately fixed in the hole 2.

If the anchor bolt 30 is provided with a retainer 16, when the anchor bolt 30 is inserted into the hole 2 and the retainer 16 is inserted into the hole 2, the rod 3 is held by the retainer 16, and The rocking of the anchor bolt 30 in the lateral direction (for example, the front-rear direction or the left-right direction) can be surely suppressed. Moreover, when the holder 16 is inserted into the hole 2, the protrusion 16a of the holder 16 abuts against the edge of the opening of the hole 2, thereby preventing the holder 16 from excessively entering the depth of the hole 2, so It is possible to leave the retainer 16 near the opening of the hole 2 that can most effectively suppress the lateral rocking motion of the anchor bolt 30, and the rocking of the rod 3 can be reliably suppressed. With this, the fixed state of the anchor bolt 30 in the hole 2 can be reliably maintained.

If the holding portion 24 is formed at the rod 3, it is only necessary to insert the anchor bolt 30' into the hole 2, and the holding portion 24 can reliably suppress the rocking of the anchor bolt 30' in the lateral direction .

1‧‧‧ Wall

2‧‧‧ hole

3‧‧‧

4‧‧‧Inner peripheral surface of the hole

7‧‧‧Cone-shaped member

8‧‧‧Expansion member

11‧‧‧inclined surface of tapered member

12‧‧‧Expansion member abutment

13‧‧‧Expansion bridge

13a‧‧‧Body part

13b‧‧‧Connected parts

14‧‧‧Inner surface of abutment

15‧‧‧ Outside the abutment

16‧‧‧Retainer

16a‧‧‧Protrusion of the holder

24‧‧‧Maintaining Department

30, 30’‧‧‧ anchor bolt

L1‧‧‧Diameter of hole

L3‧‧‧ The distance between the bending places of each pair of connecting parts

[Fig. 1] A front view showing one embodiment of the anchor bolt of the present invention.

[Fig. 2] A longitudinal sectional view of the anchor bolt of the present invention.

[Fig. 3] A front view of the tapered member of the anchor bolt of the present invention.

[Fig. 4] A plan view of the bridge portion of the anchor bolt of the present invention.

[FIG. 5] A cross-sectional view taken along the line A-A of FIG. 4.

[Fig. 6] A longitudinal cross-sectional view for explaining a processing procedure for mounting the anchor bolt of the present invention in a hole.

[Fig. 7] A longitudinal cross-sectional view showing a state after the anchor bolt of the present invention is installed in a hole.

[Fig. 8] A longitudinal sectional view showing other embodiments of the anchor bolt of the present invention.

[Fig. 9] A longitudinal sectional view showing other embodiments of the anchor bolt of the present invention.

Based on FIGS. 1-7, one embodiment of the anchor bolt of the present invention will be described. The anchor bolt 30 is inserted into a hole 2 drilled (installed) in the wall surface 1 of a concrete top plate, for example, and fixed (installed) (refer to FIG. 7).

The aforementioned anchor bolt 30 is, as shown in FIGS. 1 and 2, arranged at the front end of the cylindrical rod 3 (the upper end in FIG. 1) to fix the anchor bolt 30 in the aforementioned hole 2. The expansion mechanism 5 at the inner peripheral surface 4 (refer to FIG. 6) of the cylindrical surface shape. The expansion mechanism 5 is provided with a tapered member 7 having a female thread 6 penetrating along the central axis, and an expansion member 8 externally embedded in the tapered member 7 by forming The male thread 9 at the outer peripheral surface of the rod 3 is screwed to the female thread 6 at the tapered member 7, and the tapered member 7 and the rod 3 are connected.

The outer peripheral surface of the tapered member 7 has a cylindrical surface shape. At four places in front, back, left, and right of the outer peripheral surface of the tapered member 7, flat inclined surfaces 11 shown in FIGS. 2 and 3 are formed at equal intervals in the circumferential direction of the tapered member 7, respectively. . That is, in the inclined surface 11 on four sides, a pair of left and right inclined surfaces 11, 11 are arranged at positions facing each other, and similarly, a pair of inclined surfaces 11, 11 in the front and rear (front and back directions in the drawing) Be placed at a position opposite to each other. Each inclined surface 11 of the tapered member 7 is inclined so as to gradually approach the central axis of the tapered member 7 as it goes toward the base end side (the lower side in FIG. 2 ). In addition, the inclined surface 11 of the tapered member 7 may not be formed all the way to the front end (the upper end in FIG. 2) or the base end (the lower end in FIG. 2) of the tapered member 7.

The aforementioned expansion member 8 is generally as shown in FIGS. 2 and 5, and is provided with four front, rear, left, and right sides respectively formed with inclined inner surfaces 14 capable of making surface contact with the inclined surfaces 11 of the tapered member 7. The contact portion 12 and the elastically deformable bridge portion 13 connected (fixed) to the front end (upper side in FIG. 2) of each contact portion 12. In detail, the pair of left and right contact portions 12 and 12 of the four contact portions 12 correspond to the pair of left and right inclined surfaces 11 and 11 of the tapered member 7 and are arranged at positions facing each other Similarly, the pair of front and rear abutment portions 12 and 12 correspond to the pair of inclined surfaces 11 and 11 of the front and rear of the tapered member 7 and are arranged at positions facing each other.

The inner surface 14 of each contact portion 12 is in surface contact with each inclined surface 11 of the tapered member 7 (the state in FIG. 7 ), followed by Inclined toward the base end side of the anchor bolt 30 and gradually approaching the central axis of the anchor bolt 30 (taper member 7). The inclination angle of the inner surface 14 of each abutment portion 12 is approximately equal to the inclination angle of each inclined surface 11 of the tapered member 7.

The bridge portion 13 is provided with a thin flat plate-shaped body portion 13a disposed at the front end side (upper side in FIG. 2) of the tapered member 7 at the expansion member 8, and the edge from the body portion 13a 4 (refer to FIG. 4 ), each extending toward the front end side (upper side in FIG. 2) of each abutment portion 12 and connecting the front end portions of the abutment portions 12 in the shape of four thin flat plates Connection part 13b.

The aforementioned connecting portion 13b is generally as shown in FIG. 5, by fitting its free end (the lower end in FIG. 5) at the outer side of the end formed before the abutment portion 12 In the state of the missing portion 12a, caulking is performed to fix the abutting portion 12. In addition, the free end of the connecting portion 13b of the bridge portion 13 and the front end of the contact portion 12 may be fixed by screws or the like, or may be fixed by welding or the like.

The body portion 13a of the bridge portion 13 is generally square as shown in FIG. 4, and the aforementioned connection portions 13b are continuously provided (connected) at the vertices (corners) of the four places. The pair of left and right connecting parts 13b, 13b of the four connecting parts 13b of the bridging part 13 correspond to the pair of left and right abutting parts 12, 12 and are arranged at positions opposite to each other. The connection portions 13b and 13b correspond to the pair of abutting portions 12 and 12 at the front and rear, and are provided in the Located opposite each other.

The body portion 13a has the dimension L2 between the continuous installation locations of the connection portions 13b and 13b at positions opposite to each other being smaller than the diameter L1 of the hole 2, thereby making it possible to bridge the bridge portion 13 The body part 13a and the connection part 13b are easily inserted into the hole 2 on the side of the aforementioned continuous installation site (the upper side in FIG. 6). For example, the body portion 13a may have a circular shape. In this case, the diameter of the body portion 13a is set to be smaller than the diameter L1 of the hole 2.

Each connecting portion 13b of the bridging portion 13 is in the state before the expansion member 8 is externally fitted to the tapered member 7, as shown in FIG. 5, from the edge of the body portion 13a toward the bridging portion 13 After extending obliquely from the outer side toward the downward direction, it is bent toward the inner side of the bridge portion 13 at the middle portion in the longitudinal direction, and then is not additionally bent. These connecting portions 13b are in a state where the expansion member 8 is embedded in the tapered member 7 as shown in FIG. 2, that is, before the anchor bolt 30 is inserted into the hole 2 in a free state In the state of FIG. 2, it is also maintained in the aforementioned bending state.

In this free state, the distance L3 between the bending places at the pair of connecting parts 13b, 13b before, after, and to the left and right becomes a wider width than the bending places at the pair of connecting parts 13b, 13b All of the directions become larger than the diameter L1 of the hole 2. In particular, at the bending places of each pair of connection portions 13b and 13b, the diagonal distance L3 when viewed in the plane shown in FIG. 4 becomes the largest, and the diagonal distance L3, It becomes larger than the diameter L1 of the hole 2. By Therefore, when the anchor bolt 30 is inserted into the hole 2, the middle of each connecting portion 13b in the up-down direction is surely abutted against the edge of the opening of the hole 2 (state in FIG. 6).

In the state of FIG. 6, by forcibly pushing the anchor bolt 30 into the hole 2, the middle portion of the connection portion 13 b is through the edge of the opening of the hole 2 or the inner peripheral surface of the hole 2 4 is pushed toward the inside of the bridge portion 13 (the tapered member 7 side) and is elastically deformed to move the contact portion 12 to the outside. With the elastic restoring force at this time, the middle portion of the connection portion 13b The contact portion 12 is pressed against the inner peripheral surface 4 of the hole 2.

The outer peripheral surface 15 of each contact portion 12 is formed into the same cylindrical surface shape as the inner peripheral surface 4 of the hole 2, whereby the outer peripheral surface 15 of the contact portion 12 becomes capable of contacting the inner peripheral surface of the hole 2 4 Make face contact. The inner surface 14 of the abutting portion 12 may not always be formed in an inclined shape to the front end (the upper end in FIG. 5) or the base end (the lower end in FIG. 5) of the abutting portion 12.

At the rod 3, equipment, piping, etc., not shown, are installed. The rod 3 and the tapered member 7 are formed of stainless steel or the like. The contact portion 12 of the expansion member 8 is formed by aluminum alloy or the like, and the bridge portion 13 is formed by stainless steel or the like.

At the lower portion (free end side) of the outer peripheral surface 15 of each abutment portion 12 of the aforementioned expansion member 8, as shown in FIG. 1, in the longitudinal direction of the abutment portion 12 (in FIG. 1 is A plurality of grooves 17 (two in this embodiment) are formed side by side in the vertical direction, and these grooves 17 extend toward the circumferential direction of the outer peripheral surface 15 of each contact portion 12.

Next, an example of the construction procedure of the anchor bolt 30 will be described. For example, the operator holds the rod 3 with his hand with the expansion mechanism 5 facing upward, and inserts the anchor bolt 30 from the bridge portion 13 side of the expansion mechanism 5 into the hole 2 of the wall surface 1. At this time, the connection portion 13b of the bridge portion 13 is in contact with the edge of the opening of the hole 2 (refer to FIG. 6). By forcibly pushing the anchor bolt 30 into the hole 2, the connection portion 13b serves as The elastic deformation causes the expansion mechanism 5 to enter the hole 2.

In this state, the anchor bolt 30 is inserted until the body portion 13a of the bridge portion 13 abuts on the upper surface 20 of the hole 2 (state in FIG. 7). At this time, due to the elastic restoring force of the connection portion 13b, the middle portion of the connection portion 13b and the contact portion 12 are pressed against the inner peripheral surface 4 of the hole 2.

Next, if the rod 3 is stretched toward the opening side of the hole 2 (the base end side of the anchor bolt 30: the lower side in FIG. 7), the tapered member 7 of the expansion mechanism 5 is co-located with the rod 3 It is lowered (moved) toward the opening side of the hole 2. At this time, as described above, since the middle portion of the connecting portion 13b and the contact portion 12 are pressed against the inner peripheral surface 4 of the hole 2, the expansion member 8 descends with the tapered member 7 The system was suppressed. Moreover, the inner peripheral surface 4 of the groove 17 of the contact portion 12 is held by the pressing portion of the contact portion 12 against the inner peripheral surface 4 of the hole 2 by grasping the inner peripheral surface 4 of the hole 2 by Therefore, the situation in which the expansion member 8 descends with the tapered member 7 is also suppressed.

By this, each inclined surface 11 of the tapered member 7 is pressed The inner surface 14 of each contact portion 12 of the expansion member 8 abuts, and the outer peripheral surface 15 of each contact portion 12 can be firmly pressed against the inner peripheral surface 4 of the hole 2. As a result, the anchor bolt 30 can be securely fixed (temporarily fixed) in the hole 2 by friction between the outer peripheral surface 15 of each contact portion 12 and the inner peripheral surface 4 of the hole 2 and the like.

After that, for example, if the rod 3 is rotated and the tapered member 7 is moved toward the base end side of the anchor bolt 30 by the action of the screw, then by the inclined surfaces 11 of the tapered member 7, each of the contact portions 12 The surface 14 is further pushed toward the inner peripheral surface 4 of the hole 2, the outer peripheral surface 15 of each abutment portion 12 is strongly pressed against the inner peripheral surface 4 of the hole 2, and the anchor bolt 30 is It is more firmly fixed in the hole 2.

At the male thread 9 of the rod 3 of the anchor bolt 30, a bracket 21 (FIG. 7) for fixing equipment, piping, etc., not shown, is mounted, and is screwed under the bracket 21 (Fitted) nut 22 (Figure 7). After that, the nut 22 is locked by a spanner or the like, and the bracket 21 is installed at the anchor bolt 30.

In addition, when the nut 22 is locked, the rod 3 is stretched further downward, and the rod 3 and the tapered member 7 of the expansion mechanism 5 are further lowered. With this, by the inclined surfaces 11 of the tapered member 7, the inner surface 14 of each contact portion 12 is further pressed toward the inner peripheral surface 4 side of the hole 2 in a surface pressure contact state, each contact The outer peripheral surface 15 of the connecting portion 12 is strongly pressed against the inner peripheral surface 4 of the hole 2, and the anchor bolt 30 is more securely fixed in the hole 2. Instead of the bracket 21, a washer (not shown) may be attached to the upper side of the nut 22.

The rod 3 of the anchor bolt 30 fixed in the hole 2 is stretched downward due to the weight of the aforementioned equipment, etc., because the inclined surfaces 11 of the tapered member 7 The inner surface 14 of each abutting portion 12 is strongly pushed, so the outer peripheral surface 15 of each abutting portion 12 is strongly pressed against the inner peripheral surface 4 of the hole 2. With this, it is possible to reliably prevent the anchor bolt 30 from being pulled out of the hole 2.

In the description of the foregoing embodiment, two pairs of inclined surfaces 11, 11 are formed at the tapered member 7, and two pairs of abutting portions 12, 12 are arranged in accordance with this, but the A pair of inclined surfaces 11, 11 may be formed only at the tapered member 7, and only a pair of abutting portions 12, 12 may be arranged in accordance with this. In addition, it is also possible to form one or more pairs of inclined surfaces 11 and 11 at the tapered member 7 and arrange the pair of contact portions 12 and 12 in three or more pairs in accordance with this. The bridging portion 13 of the expansion member 8 only needs to be elastically deformable at least at the connecting portion 13b, and it is also possible to make the entire bridging portion 13 elastically deformable. Instead of the groove 17 of each contact portion 12 of the expansion member 8 or together with the groove 17, a convex portion (not shown) may be provided on the outer peripheral surface 15 of the contact portion 12.

In addition, not only at the front end of the rod 3, but also at the middle of the longitudinal direction of the rod 3, one or plural expansion mechanisms 5 may be arranged. In this case, at the body portion 13a of the bridge portion 13 of the expansion member 8 located at the middle of the expansion mechanism 5 at the middle of the longitudinal direction of the rod 3, a through hole is provided for the rod 3 to pass through.

In this way, after inserting the anchor bolt 30 into the hole 2 At this time, due to the elastic restoring force of the connection portion 13b of the bridge portion 13 of the expansion member 8, the connection portion 13b is pressed against the inner peripheral surface 4 of the hole 2, and the expansion member 8 is caused by friction or the like (Bridge 13) is held firmly at the inner peripheral surface 4 of the hole 2. As a result, the expansion member 8 is suppressed from descending as the rod 3 (taper member 7) is lowered, and accordingly, the inclined surface 11 of the cone member 7 can be firmly pressed against On the inner surface 14 of the contact portion 12 of the expansion member 8, the anchor bolt 30 can be reliably fixed in the hole 2.

At the rod 3 of the anchor bolt 30, a cylindrical holder 16 shown in FIG. 8 may also be arranged. The holder 16 is configured so that the rod 3 can be inserted, and when inserted into the hole 2 (the state of FIG. 8 ), it becomes the end of the opening side of the hole 2 (in FIG. 8) At the lower end), a ring-shaped protrusion 16a protruding toward the radial direction (lateral direction) of the holder 16 is provided. The holder 16 is formed of steel, synthetic resin, or the like.

The protruding portion 16a of the retainer 16 is an end surface that becomes the deep side of the hole 2 when inserted into the hole 2 (in FIG. 8, it is the upper side), and is formed so as to face the retainer 16 The inclined plane shape (taper shape) gradually approaching the deep side of the hole 2 on the center axis side. In addition, the edge portion of the upper end of the holder 16 is formed in an inclined plane shape (tapered plane shape).

The inner diameter of the retainer 16 is set to be slightly larger than the outer diameter of the rod 3 of the anchor bolt 30. By this, the rod 3 of the anchor bolt 30 can be inserted inside the holder 16 with almost no impedance, and In addition, since the gap between the inner peripheral surface of the holder 16 and the rod 3 is small, the movement of the rod 3 in the lateral direction relative to the holder 16 is suppressed accordingly. In the holder 16, the outer diameter of the protrusion 16a is set to be larger than the inner diameter of the hole 2, and when the holder 16 is inserted into the hole 2, the protrusion 16a is in contact with the hole 2. The edge of the opening. As a result, the holder 16 is not inserted into the deep side of the hole 2 more than the position of the opening of the hole 2.

After that, the holder 16 with the protruding portion 16a facing downward is fitted to the rod 3 of the anchor bolt 30, and the holder 16 is inserted (pushed) into the hole 2 until the underside of the holder 16 becomes The position of the opening of the hole 2 (hereinafter, referred to as a specific position) which is substantially the same plane as the wall surface 1 is installed at the position of the opening of the hole 2 (fixed and held). During the installation, the protruding portion 16a of the holder 16 comes into contact with the edge portion of the opening of the hole 2 (state in FIG. 8).

By forming the edge of the upper end of the holder 16 into an inclined plane, the holder 16 can be smoothly inserted into the hole 2. By forming the upper surface of the protruding portion 16a of the holder 16 into an inclined plane, when the holder 16 is inserted into the hole 2, the protruding portion 16a bites into the edge of the opening of the hole 2 and becomes easily fixed and held At the opening of the hole 2. By arranging the holder 16 at the rod 3, the movement of the rod 3 in the lateral direction (front-rear direction or left-right direction) is suppressed. Therefore, the rocking of the rod 3 causes it to be fixed to the rod 3 The occurrence of sway in the equipment at the pole 3 is suppressed.

The retainer 16 is ideally located at the opening of the hole 2, but it can also enter the deep side of the hole 2 more than the opening of the hole 2 or from the aforementioned The opening of the hole 2 is slightly separated. The holder 16 may be provided with a cut extending in the axial direction (the vertical direction in FIG. 8). The protruding portion 16a may be formed only at a part of the circumferential surface of the holder 16.

In addition, a groove may be formed in the circumferential direction of the inner circumferential surface of the holder 16, and an annular elastic body made of fluororubber or nitrile rubber that is easily deformed may be arranged in the groove. This elastic body is able to contact the rod 3 through which the anchor bolt of the holder 16 is inserted. The elastomer may also be a synthetic resin that is liable to undergo plastic deformation.

At a middle position in the longitudinal direction of the aforementioned rod 3, as shown in FIG. 9, a cylinder having a diameter equal to or slightly smaller than the diameter L1 of the aforementioned hole 2 may also be provided (formed)形的保护部24。 The holding portion 24 of the shape. The holding portion 24 is ideally positioned near the opening that will become the opening of the hole 2 when the anchor bolt 30 is inserted into the hole 2 (the state of FIG. 9 ). The location can be located at any location.

In this way, even when the holding portion 24 is provided at the lever 3, the movement of the lever 3 toward the lateral direction (the front-rear direction or the left-right direction) is suppressed.

3‧‧‧

5‧‧‧Expansion

7‧‧‧Cone-shaped member

8‧‧‧Expansion member

9‧‧‧ male thread

12‧‧‧Expansion member abutment

12a‧‧‧Notch

13‧‧‧Expansion bridge

13a‧‧‧Body part

13b‧‧‧Connected parts

15‧‧‧ Outside the abutment

17‧‧‧Ditch

30‧‧‧Anchor bolt

Claims (4)

An anchor bolt (30) is an anchor bolt (30) used to be inserted into a hole (2) provided in a wall surface (1) and fixed, and is characterized in that it is connected with a rod (3) At the tapered member (7), an expansion member (8) is embedded. At the outer peripheral surface of the tapered member (7), a tapered member (7) is formed so as to approach the tapered member (7) as it goes toward the base end side The inclined surface (11) inclined in the manner of the central axis, the expansion member (8) is provided with: an inclined surface capable of making surface contact with the inclined surface (11) of the tapered member (7) The contact portion (12) of the inner surface (14), and the bridge portion (13) connected to the contact portion (12) and capable of elastic deformation, the bridge portion (13) is provided with: The body part (13a) on the front end side of the tapered member (7), and extending from the edge of the body part (13a) toward the abutment part (12) side and with the front end of the abutment part (12) The connection part (13b) is connected to the part, the connection part (13b) is extended from the edge of the body part (13a) toward the outside of the bridge part (13) in an oblique direction, before The middle part in the longitudinal direction is bent toward the inner side of the bridging part (13) and has not been bent afterwards, and then connected to the front end of the abutment part (12), when the anchor bolt (30) is connected When inserted into the hole (2), the middle part of the connection part (13b) is pushed to the edge of the opening of the hole (2) or the inner peripheral surface (4) of the hole (2) And elastically deform the contact part to move outward, and the elastic restoring force at this time pushes the middle part of the connection part (13b) or the contact part (12) against the hole (2) at the inner periphery (4). An anchor bolt (30) as described in item 1 of the patent application scope, wherein at least a pair of the inclined surfaces (11) and (11) are formed on the outer peripheral surface of the tapered member (7). The pair of inclined surfaces (11) and (11) are arranged at positions opposite to each other, and the abutment portion (12) corresponds to the pair of the inclined surfaces (11) and (11) A pair, the connection portion (13b) of the bridge portion (13), corresponding to the pair of the abutment portions (12), (12) is provided with at least one pair, insert the anchor bolt (30) In the free state before the hole (2), the distance (L3) between the bending points of the paired connection parts (13b) and (13b) is configured to be higher than that of the hole (2) The diameter (L1) is larger. The anchor bolt (30) as described in item 1 or 2 of the patent application scope, wherein it is provided with a cylindrical holder capable of inserting the rod (3) of the anchor bolt (30) (16) The holder (16) is provided at the end of the opening side of the hole (2) when inserted into the hole (2), and is provided with a protruding portion (16a) protruding laterally , The outer diameter at the protruding portion (16a) is set to be larger than the diameter (L1) of the aforementioned hole (2). The anchor bolt (30') as described in item 1 or item 2 of the patent application scope, wherein a holding portion (24) is formed at a middle position in the longitudinal direction of the aforementioned rod (3), and the holding portion (24) It is arranged at a position that becomes the inside of the hole (2) when the anchor bolt (30') is inserted into the hole (2) and fixed.

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