WO2014119488A1

WO2014119488A1 - Anchor bolt

Info

Publication number: WO2014119488A1
Application number: PCT/JP2014/051553
Authority: WO
Inventors: 安藤　和明; 徹柳井
Original assignee: 株式会社豊和
Priority date: 2013-02-01
Filing date: 2014-01-24
Publication date: 2014-08-07
Also published as: JP6207532B2; JPWO2014119488A1

Abstract

Provided is an anchor bolt which is less likely to come out of a hole provided in a concrete wall surface or the like. This anchor bolt (1) is adapted to be affixed in a hole (3) provided in a wall surface (2) and is provided with a bolt body (5), a tapered member (7) which is engaged through threads with the bolt body (5), and four contact sections (8) which are fitted over the tapered member (7). The outer peripheral surfaces (17) of the contact sections (8) come into surface contact with the inner peripheral surface (18) of the hole (3). The upper ends of the contact sections (8) connect to bridge sections (12). The peripheral side surface (9) of the tapered member (7) has formed thereon sloped surfaces (14) with which the contact surfaces (15) of the contact sections (8) come into contact. The contact surfaces (15) of the contact sections (8) and the sloped surfaces (14) of the tapered member (7) are each sloped so as to approach the axis of the bolt body (5) as the contact surfaces (15) and the sloped surfaces (14) extend toward the base end side of the bolt body (5). When in a free state, the contact sections (8) separate from the bolt body (5) as the contact sections (8) extend toward the free end side of the contact sections (8).

Description

Anchor bolt

The present invention relates to an anchor bolt fixed to a hole provided in a wall surface such as a concrete ceiling.

For example, as shown in Patent Document 1, a hole is drilled in a wall surface such as an existing concrete side wall or ceiling with a drill, an anchor bolt is fixed to the hole, and equipment, piping, or the like is arranged in the anchor bolt. Things are known.

Specifically, the anchor bolt of Patent Document 1 has a taper surface whose diameter increases as it approaches one end side and a bolt member having a male screw formed on the other end side, and is externally fitted to the bolt member. And a sleeve whose one end is expanded by a tapered surface.

Then, after inserting the bolt member of the anchor bolt from one end side into the hole formed in the concrete wall surface, the nut screwed to the bolt member is rotated to pull the bolt member in the direction of pulling out from the hole. Apply power. Thereby, the taper surface of the bolt member of the anchor bolt bites into one end side of the sleeve, the one end side of the sleeve expands and bites into the concrete, and the anchor bolt is fixed to the concrete wall surface.

Utility Model Registration No. 3031999

In the anchor bolt of Patent Document 1, since the anchor bolt is fixed to the concrete wall surface by only a part of the sleeve biting into the concrete, when an excessive pulling force is applied to the anchor bolt, the anchor bolt is attached to the concrete wall surface. There is a risk of coming out of the hole.

The present invention has been provided for the purpose of solving such inconveniences, and is to provide an anchor bolt which is difficult to be removed from a hole provided in a wall surface of a civil engineering structure.

In order to solve such inconvenience, the present invention is an anchor bolt 1 that is fixed to a hole 3 provided in a wall surface 2 and has a bolt body 5 in which a male screw 4 is formed on a cylindrical outer peripheral surface, and the bolt. It has a taper member 7 in which a female screw 6 screwed into the male screw 4 of the main body 5 is formed in a penetrating manner, and at least three abutting portions 8 that are externally fitted to the taper member 7. The outer peripheral surface 17 of the portion 8 has a cylindrical surface shape and can come into surface contact with the inner peripheral surface 18 of the hole 3, and the upper end portion of each contact portion 8 is connected to the bridging portion 12. The front end of the bolt body 5 can come into contact with the bridging portion 12, and a planar contact surface 15 formed inside each contact portion 8 is formed on the peripheral side surface 9 of the taper member 7. A flat inclined surface 14 that abuts each other is formed. -Each inclined surface 14 of the member 7 is inclined so as to approach the central axis of the bolt main body 5 toward the base end side of the bolt main body 5, and the entire contact portion 8 is inserted into the hole 3. When the bolt main body 5 in contact with the bridging portion 12 is turned (rotated), the bolt main body 5 rotates about the abutting portion with the bridging portion 12, and the taper member 7 is screwed accordingly. By moving to the opening side of the hole 3, each inclined surface 14 of the taper member 7 pushes the contact surface 15 of each contact portion 8 toward the inner peripheral surface 18 side of the hole 3, respectively.

The wall surface 2 here includes civil structures such as tunnels and wall surfaces such as ceilings and side walls of buildings. The base end of the bolt main body 5 means an end on the opposite side of the front end of the bolt main body 5 that can contact the bridging portion 12. As the number of the contact portions 8 increases, the contact area between the outer peripheral surface 17 of the contact portion 8 and the inner peripheral surface 18 of the hole 3 can be increased, but the structure of the anchor bolt 1 becomes complicated. The number of 8 is set in consideration of the contact area and the structure of the anchor bolt 1.

Specifically, the taper member 7 has inclined surfaces 14 formed on four sides of the peripheral side surface 9, and the abutting portions 8 are arranged by arranging the abutting portions 8 corresponding to the positions of the inclined surfaces 14. Are opposed to each other, and the bridging portion 12 is composed of two bridging portion pieces 12a and 12b, and each pair of

abutting portions

8 and 8 is provided at both ends of each bridging portion piece 12a and 12b, respectively. It connects and each bridge | crosslinking part piece 12a * 12b has connected the intermediate part.

Further, the bolt body 5 can hold the ball 11 at the tip thereof so as to prevent it from coming off, and the ball 11 can come into contact with the bridging portion 12.

Further, a groove 20 extending in the circumferential direction may be provided on the outer peripheral surface 17 of each contact portion 8.

Further, at least one abutting portion 8 is in a free state before the anchor bolt 1 is inserted into the hole 3, and is separated from the bolt body 5 toward the free end side. Then, the distance L4 from the central axis of the bolt body 5 is larger than the radial dimension L5 of the hole 3, and when the anchor bolt 1 is inserted into the hole 3 from the bridging portion 12 side, the bolt becomes closer to the free end side. The abutting portion 8 that is separated from the main body 5 is regulated by the inner peripheral surface 18 of the hole 3 and approaches the bolt main body 5 side, and each abutting portion 8 contacts the inner peripheral surface 18 of the hole 3 by the restoring force at that time. You may make it press.

Further, the bridging portion 12 is divided for each abutting portion 8, and the divided divided

bridging portion pieces

12 c, 12 d, 12 e, and 12 f move in a direction in which the abutting portion 8 moves away from the central axis of the bolt body 5. You may make it connect so that it is possible.

In the anchor bolt 1 of the present invention, when the entire abutting portion 8 is inserted into the hole 3 and the bolt body 5 that is in contact with the bridging portion 12 is turned by hand, for example, the bolt main body 5 becomes the bridging portion 12. , The taper member 7 moves to the opening side of the hole 3 (opening into which the anchor bolt 1 is inserted), and each inclined surface 14 of the taper member 7 is moved to each contact portion. The abutting surface 15 of 8 is pushed toward the inner peripheral surface 18 side of the hole 3. Thereby, the outer peripheral surface 17 of each contact portion 8 is in surface pressure contact with the inner peripheral surface 18 of the hole 3 (that is, in a state where the outer peripheral surface 17 of each contact portion 8 is in surface contact with the inner peripheral surface 18 of the hole 3. The anchor bolt 1 is held in the hole 3 by surface friction between the outer peripheral surface 17 of each contact portion 8 and the inner peripheral surface 18 of the hole 3.

In order to fix the anchor bolt 1 in the holding state to the hole 3, for example, a nut is screwed into the bolt body 5 of the anchor bolt 1 in the holding state, and the nut is rotated to attach the nut to the opening of the hole 3. The bolt body 5 is pulled by the nut while being pressed around the edge. As a result, the taper member 7 further moves toward the opening side of the hole 3, and the contact surface 15 of each contact portion 8 is further pushed toward the inner peripheral surface 18 side of the hole 3 by the inclined surfaces 14 of the taper member 7. The outer peripheral surface 17 of each abutting portion 8 is more in pressure contact with the inner peripheral surface 18 of the hole 3. As a result, the anchor bolt 1 is securely fixed to the hole 3. As a result, the anchor bolt 1 can be reliably prevented from coming out of the hole 3. When the bolt body 5 can be turned with a strong force by a tool or the like, the anchor bolt 1 can be inserted into the hole 3 only by turning the bolt body 5 with a tool or the like without screwing the nut into the bolt body 5. Can be fixed securely.

When the bolt body 5 of the anchor bolt 1 fixed to the hole 3 is pulled to the outside of the hole 3 due to the weight of the equipment fixed to the bolt body 5, the taper member 7 is attached to each contact portion 8 accordingly. Since each of the contact surfaces 15 is pressed more strongly, the outer peripheral surface 17 of each contact portion 8 is more strongly pressed against the inner peripheral surface 18 of the hole 3. Thereby, it is possible to more reliably prevent the anchor bolt 1 from coming out of the hole 3.

Further, since the contact area between the outer peripheral surface 17 of each contact portion 8 and the inner peripheral surface 18 of the hole 3 can be increased by increasing the number of the contact portions 8, each contact portion is increased by that amount. Thus, the surface friction between the outer peripheral surface 17 and the inner peripheral surface 18 of the hole 3 can be increased, whereby the anchor bolt 1 can be securely fixed to the hole 3.

When the

abutting portions

8 and 8 are connected to both ends of the two bridging portion pieces 12a and 12b constituting the bridging portion 12, for example, one of the bridging portion pieces 12a and the

abutting portions

8 and 8 are connected to the taper member 7. After the outer side of the taper member 7 is externally fitted to the taper member 7, the other bridging portion piece 12 b and the

contact portions

8, 8 can be externally fitted to the taper member 7 from the side of the taper member 7.

That is, for example, when the bridging portion 12 is formed in a four-pronged shape and the abutting portions 8 are respectively connected to the four end portions of the bridging portion 12, the interval between the abutting portions 8 is forced. The taper member 7 must be fitted inwardly of the four contact portions 8 while being spread out, and each contact portion 8 must be externally fitted to the taper member 7. As described above, the two bridging portions 12 are provided. Since the cross-linking portion pieces 12a and 12b are configured, it is not necessary to forcibly widen the interval between the contact portions 8, and the contact portions 8 are easily fitted on the taper member 7 by that amount. Thus, the assembly of the anchor bolt 1 can be easily performed.

When the ball 11 at the tip of the bolt body 5 is brought into contact with the bridging portion 12, the bridging portion 12 and the ball 11 of the bolt main body 5 are in point contact with each other, and the friction when rotating the bolt main body 5 is reduced accordingly. The bolt body 5 can be rotated with a small force.

When the groove 20 is provided on the outer peripheral surface 17 of each contact portion 8, when the outer peripheral surface 17 of the contact portion 8 is in pressure contact with the inner peripheral surface 18 of the hole 3, the edge of the groove 20 is the inner peripheral surface of the hole 3. 18, thereby preventing the anchor bolt 1 from coming out of the hole 3 more reliably.

When at least one contact portion 8 is separated from the bolt body 5 toward the free end in a free state before the anchor bolt 1 is inserted into the hole 3, and the anchor bolt 1 is inserted into the hole 3. When the contact portion 8 is regulated by the inner peripheral surface 18 of the hole 3 and approaches the bolt main body 5 side, each contact portion 8 is pressed against the inner peripheral surface 18 of the hole 3 by the restoring force at that time. Thereby, each contact portion 8 is held in the hole 3. As a result, when the bolt body 5 is turned, it is not necessary to support the contact portion 8 in order to prevent the bolt body 5 from being pulled out, and the installation work efficiency of the anchor bolt 1 is improved accordingly.

When each divided

bridge portion

12c, 12d, 12e, and 12f is connected so that each contact portion 8 is movable in a direction away from the central axis of the bolt body 5, each contact portion 8 is divided into the divided bridge portion pieces. It can move without being disturbed by the restoring force of 12c, 12d, 12e, and 12f, and the respective contact portions 8 can be firmly brought into pressure contact with the inner peripheral surface 18 of the hole 3 by that amount.

It is a perspective view which shows 1st Example of the anchor bolt which concerns on this invention. It is a disassembled perspective view of the anchor bolt of 1st Example. It is a side view of the intermediate processed product for demonstrating the procedure of manufacture of the bridge | crosslinking part and contact part which concern on the anchor bolt of 1st Example. It is a side view for demonstrating the procedure of manufacture of the bridge | crosslinking part and contact part which concern on the anchor bolt of 1st Example. It is a side view for demonstrating the procedure of manufacture of the bridge | crosslinking part and contact part which concern on the anchor bolt of 1st Example. It is sectional drawing for demonstrating the procedure which hold | maintains the anchor bolt of 1st Example to a hole. It is sectional drawing for demonstrating the procedure which hold | maintains the anchor bolt of 1st Example to a hole. It is sectional drawing for demonstrating the procedure which fixes the anchor bolt of 1st Example to a hole. It is sectional drawing for demonstrating the procedure which attaches the anchor bolt of 2nd Example, and the anchor bolt to a hole. It is sectional drawing for demonstrating the procedure which attaches the anchor bolt of 2nd Example to a hole. It is a perspective view of the bridge | crosslinking part and contact part which concern on the anchor bolt of 3rd Example. It is sectional drawing of the anchor bolt of 3rd Example. It is sectional drawing of the anchor bolt of 3rd Example. It is a side view which shows the anchor bolt of 4th Example. It is the figure seen from the A direction of FIG. FIG. 14 is a cross-sectional view taken along line BB in FIG. 13.

A first embodiment of an anchor bolt according to the present invention will be described with reference to FIGS. For example, as shown in FIG. 8, the anchor bolt 1 of the present invention is fixed in a state of being inserted into a hole 3 provided (provided) in a wall surface 2 of a concrete ceiling.

As shown in FIGS. 1 and 2, the anchor bolt 1 is centered on a bolt main body 5 in which a male screw 4 is formed on a cylindrical outer peripheral surface and a female screw 6 screwed into the male screw 4 of the bolt main body 5. The taper member 7 is formed in a penetrating manner along the axis, and four contact portions 8 that are externally fitted to the taper member 7 are provided. The four contact portions 8 are arranged at four positions on the cylindrical peripheral side surface 9 of the taper member 7, respectively. Specifically, the contact portions 8 have the same shape and are arranged at equal intervals in the circumferential direction of the taper member 7. On the lower end (base end: right side in FIG. 1) side of the bolt body 5, unillustrated equipment and piping are fixed.

The bolt body 5 holds the ball 11 at its upper end (tip: left side in FIG. 2) in a retaining manner. The male screw 4 of the bolt main body 5 is formed at least on the upper part of the bolt main body 5 which is a screwing range with the taper member 7. The upper ends of the four abutting portions 8 are connected to the bridging portion 12 so that the ball 11 at the tip of the bolt body 5 can abut on the bridging portion 12. The bolt body 5 is rotatable about a contact point with the bridging portion 12, that is, a contact point between the ball 11 and the bridging portion 12 (see FIG. 7).

In this way, since the ball 11 which is the tip of the bolt body 5 comes into contact with the bridging portion 12, the bridging portion 12 and the bolt body 5 are in point contact, and the friction when the bolt body 5 is rotated by that amount. Can be reduced. Further, since the ball 11 of the bolt main body 5 is in contact with the bridging portion 12, the bolt main body 5 is prevented from moving above the bridging portion 12 from the position of FIG. Note that the ball 11 may be held at the upper end of the bolt body 5 so as to prevent the ball 11 from being detached. Further, instead of the ball 11, the upper end portion (tip portion) of the bolt main body 5 may be formed in a hemispherical shape.

A flat inclined surface 14 is formed on each side of the peripheral side surface 9 of the taper member 7. Specifically, the inclined surfaces 14 are formed at equal intervals in the circumferential direction of the peripheral side surface 9 of the taper member 7. Each inclined surface 14 is in contact (surface contact) with a flat contact surface 15 formed inside the contact portion 8. Each contact portion 8 is arranged corresponding to the position of each inclined surface 14.

Each inclined surface 14 of the taper member 7 and the contact surface 15 of each contact portion 8 are respectively connected to the bolt body 5 (taper member 7) toward the proximal end side (lower end side which is the right side in FIG. 2) of the bolt body 5. ) To be closer to the central axis (see FIG. 6). As shown in FIG. 7, the outer peripheral surface 17 of each contact portion 8 is capable of surface pressure contact (surface contact) with the cylindrical inner peripheral surface 18 of the hole 3.

As shown in FIGS. 1 and 2, the bridging portion 12 includes two long plate-like bridging portion pieces 12a and 12b arranged in a crossing manner, and the length direction of the respective bridging portion pieces 12a and 12b. The upper end portions of the abutting portions 8 are connected to the both ends of each. That is, in each bridging piece 12a and 12b, two abutting portions 8 are arranged in a pair so as to face each other.

Of the two bridging part pieces 12a and 12b of the bridging part 12, one bridging part piece 12a is formed such that its central part (intermediate part) is recessed, and the other bridging part piece 12b is its central part. It is formed so that the (intermediate part) is raised. Then, the central part (intermediate part) of the bridging part pieces 12a and 12b is formed by superimposing the central part of the other bridging part piece 12b on the upper side of the central part of the one bridging part piece 12a and connecting and fixing with the screws 16. Are integrated. In this state, the end portions of both bridging portion pieces 12a and 12b are flush with each other (the state shown in FIG. 1), and accordingly, the vertical height positions of the contact portions 8 are aligned.

Here, an example of a procedure for manufacturing the bridging portion 12 and the contact portion 8 will be described. First, the intermediate processed product 19 (FIG. 3) in which the bridging portion 12 (corresponding to the bridging portion piece 12a or the bridging portion piece 12b) and the

contact portions

8 and 8 are arranged in a straight line is manufactured by, for example, pressing. .

The intermediate processed product 19 is pressed so that the central portion in the length direction is recessed with the outer peripheral surface 17 of the abutting portion 8 facing upward, and a product corresponding to one bridging piece 12a is produced. (State of solid line in FIG. 4). Further, both sides of the intermediate processed product 19 are bent (state in the two-dot chain diagram of FIG. 4). Thereby, one bridge | crosslinking part piece 12a which connected the contact part 8 * 8 shown in FIG. 2 is produced.

Further, the intermediate processed product 19 is pressed so that the central portion in the length direction is raised with the outer peripheral surface 17 of the contact portion 8 facing upward, and the intermediate processed product 19 corresponds to the other bridging portion piece 12b. It is produced (state in the solid line diagram of FIG. 5). Further, both sides of the intermediate processed product 19 are bent (state in the two-dot chain diagram of FIG. 5). Thereby, the other bridge | crosslinking part piece 12b which connected the contact part 8 * 8 shown in FIG. 2 is produced.

In this way, from one kind of intermediate processed product 19, there are two types of one bridging part piece 12 a connecting the

contact parts

8, 8 and the other bridging part piece 12 b connecting the

contact parts

8, 8. Since it can be manufactured, the labor for managing the parts of the anchor bolt 1 is reduced accordingly.

The male screw 4 of the bolt body 5 is formed as a right-hand screw, whereas the screw 16 is formed as a left-hand screw (reverse screw), whereby the screw 16 is turned when the bolt body 5 is turned. To prevent it from loosening.

The bolt body 5, the taper member 7, each contact portion 8, and each bridge portion 12 a and 12 b of the anchor bolt 1 are each formed of stainless steel. Each bridge | crosslinking part piece 12a * 12b is elastically deformable, and both contact part 8 * 8 in each bridge | crosslinking part piece 12a * 12b can each rock | fluctuate to a horizontal direction now.

As shown in FIG. 1, a plurality of grooves 20 are formed at equal intervals in the vertical direction at the lower part of the outer peripheral surface 17 of each contact portion 8. It extends in the circumferential direction of the outer peripheral surface 17. The groove 20 may be inclined obliquely in the vertical direction with respect to the outer peripheral surface 17 of the contact portion 8, or may be formed in a part of the outer peripheral surface 17 of the contact portion 8 in the circumferential direction. . A convex shape (not shown) may be provided on the outer peripheral surface 17 of the contact portion 8 instead of or together with the groove 20.

As shown in FIG. 2, the length dimension L1 in the axial direction (vertical direction) of the bolt body 5 at each contact portion 8 is larger than the length dimension L2 in the axial direction of the bolt body 5 of the taper member 7. Yes. As a result, the contact area between the outer peripheral surface 17 of the contact portion 8 and the inner peripheral surface 18 of the hole 3 of the concrete wall 2 is increased, and the anchor bolt 1 is securely fixed to the hole 3.

In addition, each abutting portion 8 has an axial length dimension L3 of the bolt body 5 from the upper end to the lower end of the abutting surface 15, and an axial length dimension of the bolt body 5 of the inclined surface 14 of the taper member 7. It is larger than L2. The vertical length L3 of the contact surface 15 of the contact portion 8 is smaller than the axial length L1 of the bolt body 5 of the contact portion 8, and from the lower end of the contact surface 15. The lower end of the contact portion 8 is a vertical plane parallel to the axis of the taper member 7.

Next, the construction procedure of the anchor bolt 1 will be described. First, the bolt body 5, the taper member 7 and the bridging portion 12 (contact portion 8) of FIG. 2 are assembled in the state of FIG. At this time, the ball 11 of the bolt body 5 is brought into contact with the lower surface of the one bridging piece 12a as shown in FIG.

With the assembled bridging portion 12 of the anchor bolt 1 in the assembled state (the state shown in FIG. 6), the entire contact portion 8 is inserted into the hole 3 of the concrete wall 2 (the state shown in FIG. 7). Thereafter, when the bolt main body 5 in which the ball 11 is in contact with the bridging portion 12 is rotated by hand, for example, the bolt main body 5 rotates about the abutting portion (ball 11) with the bridging portion 12, and accompanying this, Then, the taper member 7 is lowered from the position shown by the solid line in FIG. 7 to the position shown by the two-dot chain line in FIG. 7 by the screw action (moves to the opening side of the hole 3).

Then, each inclined surface 14 of the taper member 7 pushes the contact surface 15 of each contact portion 8 outward (on the inner peripheral surface 18 side of the hole 3), and thereby the outer peripheral surface 17 of each contact portion 8. Is pressed against the inner peripheral surface 18 of the hole 3 (that is, pressed in a state where the outer peripheral surface 17 of each contact portion 8 is in surface contact with the inner peripheral surface 18 of the hole 3). The anchor bolt 1 is held in the hole 3 by friction between the outer peripheral surface 17 and the inner peripheral surface 18 of the hole 3.

In order to fix the anchor bolt 1 in the holding state to the hole 3, as shown in FIG. 8, for example, equipment equipment and piping (not shown) are fixed to the bolt body 5 of the anchor bolt 1 in the holding state. A bracket 28 is mounted, and a nut 29 is screwed onto the lower side of the bracket 28 (state shown in FIG. 8).

Then, the nut 29 is turned with a spanner (wrench) or the like, and the nut 29 is pressed around the lower edge of the hole 3 through the bracket 28. When the nut 29 is further turned, the bolt body 5 is pulled downward by the nut 29, and the bolt body 5 and the taper member 7 are further lowered. The contact surface 15 of each contact portion 8 is further pushed toward the inner peripheral surface 18 side of the hole 3 by each inclined surface 14 of the taper member 7, and the outer peripheral surface 17 of each contact portion 8 is the inner peripheral surface of the hole 3. 18 is pressed against the surface more strongly. As a result, the anchor bolt 1 is securely fixed to the hole 3. A washer may be mounted on the upper side of the nut 29 instead of the bracket 28. In that case, equipment and piping are fixed to the lower end (base end: right side in FIG. 1) side of the bolt body 5.

When the bolt body 5 can be turned with a strong force by a tool or the like, the anchor bolt 1 can be inserted into the hole 3 only by turning the bolt body 5 with a tool or the like without screwing the nut 29 into the bolt body 5. Can be securely fixed.

Even if the bolt main body 5 of the anchor bolt 1 fixed to the hole 3 is pulled downward by the weight of equipment or the like fixed to the lower end of the bolt main body 5, the taper member 7 is applied to each of the bolt members 5 accordingly. Since each of the contact surfaces 15 of the contact portion 8 is pressed more strongly, the outer peripheral surface 17 of each contact portion 8 is more strongly pressed against the inner peripheral surface 18 of the hole 3. Thereby, it is possible to more reliably prevent the anchor bolt 1 from coming out of the hole 3.

When the contact portion 8 is in pressure contact with the inner peripheral surface 18 of the hole 3, the upper and lower edges of the groove 20 of each contact portion 8 bite into the inner peripheral surface 18 of the hole 3, thereby anchor bolts. 1 is further prevented from falling out of the hole 3.

Next, a second embodiment of the anchor bolt 1 according to the present invention will be described with reference to FIGS. In the second embodiment, each of the bridging portion pieces 12a and 12b of the bridging portion 12 can be elastically deformed as in the first embodiment, and the abutting

portions

8 and 8 can swing in the horizontal direction. ing.

As shown in FIG. 9, each abutting portion 8 of the anchor bolt 1 is in a free state (the state shown in FIG. 9) before the anchor bolt 1 is inserted into the hole 3. The distance L4 from the center axis of the bolt body 5 to the lower end of the contact portion 8 is the radial dimension L5 of the hole 3 at the lower end (free end) of each contact portion 8. Is bigger than.

Thus, when the anchor bolt 1 is inserted into the hole 3 with the bridging portion 12 facing upward (state of FIG. 10), each contact portion 8 is regulated by the inner peripheral surface 18 of the hole 3 and the bolt body 5 Approach the side. Each contact portion 8 is pressed against the inner peripheral surface 18 of the hole 3 by the restoring force at that time, whereby the contact portion 8 is held in the hole 3. Since other configurations are the same as those of the first embodiment, the description thereof is omitted.

Thus, in the second embodiment, when the anchor bolt 1 is inserted into the hole 3, the abutting portion 8 is held by the hole 3 and is prevented from falling out of the hole 3, so the bolt body 5 is turned. At this time, it is not necessary to support the contact portion 8 in order to prevent the dropout, and the efficiency of the installation work of the anchor bolt 1 is improved accordingly.

Next, a third embodiment of the anchor bolt 1 according to the present invention will be described with reference to FIGS. In the third embodiment, the bridging portion 12 is divided into four divided bridging

portion pieces

12c, 12d, 12e, and 12f, and one abutment portion 8 for each of the divided bridging

portion pieces

12c, 12d, 12e, and 12f. Are connected. That is, the bridging portion 12 is divided for each abutting portion 8, and each divided bridging

portion

12 c, 12 d, 12 e, 12 f moves in a direction in which the abutting portion 8 moves away from the central axis of the bolt body 5. Connected as possible.

In detail, as shown in FIG. 11, the contact part 8 and the 2nd division | segmentation bridge | crosslinking part piece which are connected to the 1st division | segmentation bridge | crosslinking part piece 12c among the said division | segmentation bridge | crosslinking part pieces 12c * 12d * 12e * 12f The contact portion 8 connected to 12d is in an opposing position, and is connected to the contact portion 8 connected to the third divided bridge portion 12e and the fourth divided bridge portion 12f. The abutting portion 8 is at the facing position.

The first divided bridge portion 12c and the third divided bridge portion 12e are respectively provided with

elongated holes

22 and 24 extending in the opposing direction of the contact portion 8, and the second divided bridge portion 12d. The fourth divided bridge part 12f is provided with

round holes

23 and 25, respectively. As shown in FIGS. 12 and 13, a pin (rivet) 26 is made to penetrate through these

long holes

22 and 24 and round holes 23 and 25, so that the divided bridging

pieces

12c, 12d, 12e, and 12f are formed. Are connected inseparably, so that the first divided bridge part 12c and the second divided bridge part 12d, and the third divided bridge part 12e and the fourth divided bridge part 12f are respectively Relative movement is possible in the opposite direction.

Thereby, each contact portion 8 is configured to be movable in a direction away from the central axis of the bolt body 5, that is, each contact portion 8 is configured to be relatively movable in the horizontal direction. In addition, each contact part 8 may be movable also in the direction approaching the central axis side of the bolt main body 5. Since other configurations are the same as those of the first embodiment, the description thereof is omitted.

As described above, in the third embodiment, each of the divided

bridge portions

12c, 12d, 12e, and 12f is relatively movable in the horizontal direction, so that each contact portion 8 is divided as the taper member 7 is lowered. It can spread freely in the horizontal direction without being disturbed by the restoring force of the bridging

pieces

12c, 12d, 12e, and 12f. Accordingly, each contact portion 8 can be securely brought into pressure contact with the inner peripheral surface 18 of the hole 3.

Next, a fourth embodiment of the anchor bolt 1 according to the present invention will be described with reference to FIGS. In the first embodiment, the bridging portion 12 is composed of two bridging portion pieces 12a and 12b, and the contact portions 8 are connected to both ends of the bridging portion pieces 12a and 12b. Then, three contact portions 8 are connected to one bridging portion 12.

More specifically, as shown in FIGS. 14 and 15, the bridging portion 12 of the fourth embodiment is formed in a trifurcated shape, and the abutting portions 8 are respectively provided at the three end portions of the bridging portion 12. It is connected. As shown in FIG. 16, the tapered member 7 forms three inclined surfaces 14 at equal intervals in the circumferential direction in accordance with the arrangement of the contact portions 8, and the three inclined surfaces 14 of the tapered member 7. Further, the contact surfaces 15 of the three contact portions 8 contact each other. Since other configurations are the same as those of the first embodiment, the description thereof is omitted.

Thus, in the present invention, three contact portions 8 may be arranged as shown in the fourth embodiment, but five or more may be arranged. That is, the present invention corresponds to one having three or more contact portions 8. In this case, the inclined surface 14 of the taper member 7 is formed according to the number of arrangement of the contact portions 8. Moreover, the bridge | crosslinking part 12 does not necessarily need to be comprised with a some bridge | crosslinking part piece, and may be comprised by one like 4th Example.

DESCRIPTION OF SYMBOLS 1 Anchor bolt 2 Wall surface 3 Hole 4 Male screw 5 Bolt main body 6 Female screw 7 Taper member 8 Contact part 9 Peripheral side surface of a taper member 11 Ball | bowl 12 Bridge | crosslinking part 12a One bridge | crosslinking part piece 12b The other bridge | crosslinking part piece 12c 1st division | segmentation bridge | crosslinking Part 12d Second divided bridge part 12e Third divided bridge part 12f Fourth divided bridge part 14 Inclined surface of the taper member 15 Contact surface of the contact part 17 Outer surface of the contact part 18 Inner circumferential surface L4 Distance from the center axis of the bolt body on the free end side of the contact part L5 Radial dimension of the hole

Claims

An anchor bolt (1) fixed to a hole (3) provided in a wall surface (2),
A bolt body (5) in which a male thread (4) is formed on a cylindrical outer peripheral surface, and a female thread (6) screwed into the male thread (4) of the bolt body (5) are formed in a penetrating manner. A taper member (7), and an abutting portion (8) fitted on the taper member (7).
The outer peripheral surface (17) of each contact portion (8) has a cylindrical surface shape, and can come into surface contact with the inner peripheral surface (18) of the hole (3).
The upper end of each contact portion (8) is connected to the bridging portion (12),
On the peripheral side surface (9) of the taper member (7), a flat inclined surface (14) with which a flat contact surface (15) formed inside each contact portion (8) contacts. )
The contact surface (15) of each contact portion (8) and each inclined surface (14) of the taper member (7) are respectively directed toward the base end side of the bolt body (5). It is inclined to approach the central axis of (5),
The entire contact portion (8) is inserted into the hole (3), and the taper member (7) is moved to the opening side of the hole (3) by a screw action, whereby the taper member (7). Each of the inclined surfaces (14) pushes the contact surface (15) of each contact portion (8) toward the inner peripheral surface (18) of the hole (3),
At least one said contact part (8) is separated from the said bolt main body (5) toward the free end side in the free state before inserting the said anchor bolt (1) in the said hole (3). The distance (L4) from the central axis of the bolt body (5) is larger than the radial dimension (L5) of the hole (3) at the free end of the contact portion (8).
When the anchor bolt (1) is inserted into the hole (3) from the bridging portion (12) side, the contact portion (8) that is separated from the bolt body (5) toward the free end side is It is regulated by the inner peripheral surface (18) of the hole (3) and approaches the bolt main body (5) side, and the respective contact portions (8) are brought into contact with the inner peripheral surface of the hole (3) by the restoring force at that time. An anchor bolt which is pressed against 18).
The taper member (7) has the inclined surface (14) formed on four sides of the peripheral side surface (9),
By arranging the contact portions (8) corresponding to the positions of the inclined surfaces (14), the contact portions (8) are opposed in pairs.
The cross-linked part (12) is composed of two cross-linked parts (12a) and (12b),
Each pair of abutting portions (8) and (8) is connected to both ends of each bridging piece (12a) and (12b), respectively, and each bridging piece (12a) and (12b) The anchor bolt according to claim 1, wherein intermediate portions are connected to each other.
The bolt body (5) holds the ball (11) at its tip in a retaining shape,
The anchor bolt according to claim 1 or 2, wherein the ball (11) abuts on the bridge portion (12).
The anchor bolt according to any one of claims 1 to 3, wherein a groove (20) extending in a circumferential direction is provided on an outer peripheral surface (17) of each contact portion (8).
The bridging portion (12) is divided for each abutting portion (8), and each divided bridging portion (12c), (12d), (12e), (12f) is divided into the abutting portion (8). The anchor bolt according to any one of claims 1 to 4, wherein the anchor bolt is movably connected in a direction away from a central axis of the bolt body (5).
An anchor bolt (1) fixed to a hole (3) provided in a wall surface (2),
A bolt main body (5) having a male screw (4) formed on a cylindrical outer peripheral surface, and a female screw (6) screwed into the male screw (4) of the bolt main body (5) are formed in a penetrating manner. A taper member (7), and an abutting portion (8) fitted on the taper member (7).
The outer peripheral surface (17) of each contact portion (8) has a cylindrical surface shape, and can come into surface contact with the inner peripheral surface (18) of the hole (3).
The upper end of each contact portion (8) is connected to the bridging portion (12),
On the peripheral side surface (9) of the taper member (7), a flat inclined surface (14) with which a flat contact surface (15) formed inside each contact portion (8) contacts. )
The contact surface (15) of each contact portion (8) and each inclined surface (14) of the taper member (7) are respectively directed toward the base end side of the bolt body (5). It is inclined to approach the central axis of (5),
The entire contact portion (8) is inserted into the hole (3), and the taper member (7) is moved to the opening side of the hole (3) by a screw action, whereby the taper member (7). Each of the inclined surfaces (14) pushes the contact surface (15) of each contact portion (8) toward the inner peripheral surface (18) of the hole (3),
The taper member (7) has the inclined surface (14) formed on four sides of the peripheral side surface (9),
By arranging the contact portions (8) corresponding to the positions of the inclined surfaces (14), the contact portions (8) are opposed in pairs.
The cross-linked part (12) is composed of two cross-linked parts (12a) and (12b),
Each pair of abutting portions (8) and (8) is connected to both ends of each bridging piece (12a) and (12b), respectively, and each bridging piece (12a) and (12b) An anchor bolt characterized by connecting intermediate portions.
An anchor bolt (1) fixed to a hole (3) provided in a wall surface (2),
A bolt main body (5) having a male screw (4) formed on a cylindrical outer peripheral surface, and a female screw (6) screwed into the male screw (4) of the bolt main body (5) are formed in a penetrating manner. A taper member (7), and an abutting portion (8) fitted on the taper member (7).
The outer peripheral surface (17) of each contact portion (8) has a cylindrical surface shape, and can come into surface contact with the inner peripheral surface (18) of the hole (3).
The upper end of each contact portion (8) is connected to the bridging portion (12),
On the peripheral side surface (9) of the taper member (7), a flat inclined surface (14) with which a flat contact surface (15) formed inside each contact portion (8) contacts. )
The contact surface (15) of each contact portion (8) and each inclined surface (14) of the taper member (7) are respectively directed toward the base end side of the bolt body (5). It is inclined to approach the central axis of (5),
The entire contact portion (8) is inserted into the hole (3), and the taper member (7) is moved to the opening side of the hole (3) by a screw action, whereby the taper member (7). Each of the inclined surfaces (14) pushes the contact surface (15) of each contact portion (8) toward the inner peripheral surface (18) of the hole (3),
The bridging portion (12) is divided for each abutting portion (8), and each divided bridging portion (12c), (12d), (12e), (12f) is divided into the abutting portion (8). ) Are movably coupled in a direction away from the central axis of the bolt body (5).