WO2015162975A1

WO2015162975A1 - Anchor bolt

Info

Publication number: WO2015162975A1
Application number: PCT/JP2015/053774
Authority: WO
Inventors: 安藤　和明; 徹柳井
Original assignee: 株式会社豊和
Priority date: 2014-04-23
Filing date: 2015-02-12
Publication date: 2015-10-29
Also published as: JPWO2015162975A1; TW201608139A; TWI682102B; JP6496305B2

Abstract

This anchor bolt (30) is fixed by being inserted into a hole (2) provided in a wall surface (1). An expanding member (8) is fitted over a taper member (7) which connects to a rod (3). The outer peripheral surface of the taper member (7) has an inclined surface (11). The expanding member (8) is provided with a contact portion (12) which has an inner surface (14) in surface contact with the inclined surface (11) of the taper member (7), and a bridge portion (13) which includes a main body area (13a) and a connection area (13b). The connection area (13b) extends from the edge of the main body area (13a) diagonally towards the outside of the bridge portion, then, at an intermediate portion in the length direction, curves towards the inside of the bridge portion (13) and then connects to the tip of the contact portion (12). When the anchor bolt (30) is inserted into the hole (2), the intermediate portion of the connection area (13b) is pushed and elastically deformed by the rim of the opening of the hole (2) and the inner peripheral surface (4) of the hole (2), and the intermediate portion of the connection area (13b) and the contact portion (12) are pressed against the inner peripheral surface (4) of the hole (2).

Description

Anchor bolt

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

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

Specifically, in the anchor bolt of Patent Document 1, a pair of left and right wedge bodies forming an inclined wedge surface that is farther from the center axis of the anchor bolt toward the tip side (lower side in FIG. 1 of Patent Document 1), A pair of left and right retaining members that form reverse wedge surfaces that contact the wedge surface of the wedge body on the inner surface side, and a U-shaped coupling bottom plate that connects (connects) the lower ends of the retaining members. Have.

Then, after inserting the anchor bolt into the hole made in the concrete floor or the like, the wedge body is raised by tightening the nut to the bolt fixed to the upper end of the wedge body, and the wedge body The surface pushes the reverse wedge surface of the retaining member. As a result, both retaining members expand in the horizontal direction (lateral direction), and the outer peripheral surface of the retaining member is pressed against the inner peripheral surface of the hole in a surface contact state, and the outer peripheral surface of the retaining member and the hole The anchor bolt is fixed to the hole by a frictional force with the inner peripheral surface.

Moreover, in the anchor bolt of patent document 1, as shown in FIG. 1 of the said patent document 1, the unevenness | corrugation is formed in the outer peripheral surface of the said retaining member, and the unevenness | corrugation is caught by the inner peripheral surface of a hole. In addition, as the wedge body is raised, the retaining member is prevented from rising.

Japanese Utility Model Publication No. 49-49364

However, in the anchor bolt of Patent Document 1, when the wedge body starts to rise, the outer peripheral surface of the retaining member is still weak because the outer peripheral surface of the retaining member still presses the inner peripheral surface of the hole. Will not be caught on the inner peripheral surface of the hole. As a result, it may not be possible to reliably prevent the retaining member from being lifted along with the rising of the wedge body. In this case, the anchor bolt may come out of the hole.

The present invention has been provided for the purpose of solving such problems, and it is an object of the present invention to provide an anchor bolt that can be reliably fixed to a hole provided in a wall surface.

The present invention solves such a problem, and is an anchor bolt 30 for being inserted into and fixed to a hole 2 provided in the wall surface 1, and the expanding member 8 is attached to the taper member 7 to which the rod 3 is connected. The outer peripheral surface of the tapered member 7 is formed with an inclined surface 11 that is inclined so as to approach the central axis of the tapered member 7 toward the proximal end side. A contact portion 12 that forms an inclined inner surface 14 that can come into surface contact with the inclined surface 11 of the taper member 7, and an elastically deformable bridging portion 13 that connects the contact portion 12. The bridging portion 13 is connected to the main body portion 13a disposed on the distal end side of the taper member 7 and the distal end portion of the abutting portion 12 extending from the edge of the main body portion 13a to the abutting portion 12 side. Part 13b, and the connection part 13b is a body part. After extending obliquely from the edge of 3a to the outside of the bridging portion 13 and then bending inward of the bridging portion 13 in the middle of the length direction, the tip of the abutting portion 12 is connected, and the anchor bolt When inserting 30 into the hole 2, the intermediate part of the connection part 13b is pushed and elastically deformed by the edge of the opening of the hole 2 or the inner peripheral surface 4 of the hole 2, and the elastic restoring force at that time The intermediate portion or the contact portion 12 is pressed against the inner peripheral surface 4 of the hole 2.

The wall 1 here includes civil structures such as tunnels, concrete ceilings, side walls and floors of buildings, rock walls, and the like. The inclined surface 11 of the taper member 7 and the inner surface 14 of the contact portion 12 may each be slightly curved. The rod 3 and the taper member 7 may be integrally formed and connected, and the taper member 7 is formed by screwing the male screw 9 provided on the rod 3 to the female screw 6 provided on the taper member 7. And the rod 3 may be connected.

Here, the case where the inner surface 14 of the contact portion 12 of the expanding member 8 is in contact with the inclined surface 11 of the taper member 7 in the free state before the anchor bolt 30 is inserted into the hole 2 and the contact state in the free state. The inner surface 14 of the portion 12 is away from the inclined surface 11 of the taper member 7, and when the anchor bolt 30 is inserted into the hole 2, the inner surface 14 of the contact portion 12 of the expanding member 8 becomes the inclined surface 11 of the taper member 7. And the case of contact. The connecting portion 13b may be bent in a curved shape (arc shape). The bridging portion 13 is applicable if at least the connecting portion 13b can be elastically deformed. Here, when the anchor bolt 30 is inserted into the hole 2, at least one of the intermediate portion of the connection portion 13 b and the contact portion 12 presses against the inner peripheral surface 4 of the hole 2.

Specifically, at least a pair of

inclined surfaces

11 and 11 is formed on the outer peripheral surface of the taper member 7, and the

inclined surfaces

11 and 11 as a pair are arranged at positions facing each other, and are in contact with each other. At least a pair of portions 12 are arranged corresponding to the pair of

inclined surfaces

11 and 11, and connection portions 13b of the bridging portion 13 are provided at least a pair corresponding to the pair of

contact portions

12 and 12. In the free state before inserting the anchor bolt 30 into the hole 2, the distance L3 between the bent portions of the connecting

portions

13b and 13b to be paired is made larger than the diameter L1 of the hole 2. be able to.

Here, when the number of pairs of inclined surfaces 11 and the number of pairs of contact portions 12 and connection portions 13b match, for example, the number of pairs of inclined surfaces 11 is equal to the number of pairs of contact portions 12 and connection portions 13b. This is the case when there are more than the numbers. The distance L3 between the bent portions of the pair of

connection portions

13b and 13b is larger than the diameter L1 of the hole 2 in all the width directions at the bent portions of the pair of

connection portions

13b and 13b. The case where the diameter is larger than the diameter L1 of the hole 2 in at least a part in the width direction at the bent portion of each pair of

connection portions

13b and 13b is included.

It has a cylindrical holder 16 through which the rod 3 of the anchor bolt 30 can be inserted, and the holder 16 is arranged in the lateral direction at the end which becomes the opening side of the hole 2 when inserted into the hole 2. It is possible to provide a projecting portion 16 a that projects to the outside, and the outer diameter at the projecting portion 16 a is larger than the diameter L 1 of the hole 2. The protrusion 16 a includes a case where the protrusion 16 a is provided over the entire peripheral surface of the holder 16 and a case where the protrusion 16 a is provided only on a part of the peripheral surface of the holder 16.

A holding portion 24 is formed at an intermediate position in the length direction of the rod 3, and the holding portion 24 is arranged at a position that becomes inside the hole 2 when the anchor bolt 30 is inserted into the hole 2 and fixed. It can be. The case where the outer diameter of the holding part 24 is equal to the diameter L1 of the hole 2 and the case where it is slightly smaller than the diameter L1 of the hole 2 are included.

In the anchor bolt 30 according to the present invention, when inserted into the hole 2 of the wall surface 1, the connection part 13 b of the bridging portion 13 of the expanding member 8 abuts the edge of the opening of the hole 2, and the anchor bolt 30 is placed in the hole 2. By forcibly pushing in, the connecting portion 13b is elastically deformed and the expanding member 8 enters the hole 2. Due to the elastic restoring force of the connecting portion 13b at that time, the intermediate portion or the contact portion 12 of the connecting portion 13b of the expanding member 8 is pressed against the inner peripheral surface 4 of the hole 2, and the expanding member is caused by friction at that time. 8 is firmly held on the inner peripheral surface 4 of the hole 2. As a result, when the taper member 7 moves to the opening side of the hole 2 together with the rod 3, the expanding member 8 moves to the opening side of the hole 2 together with the taper member 7 by the taper member 7 hitting the contact portion 12. Thus, it is possible to suppress the inclined surface 11 of the taper member 7 from being difficult to press the inner surface 14 of the contact portion 12 of the expanding member 8. Thereby, the inclined surface 11 of the taper member 7 is firmly pressed against the inner surface 14 of the abutting portion 12 of the spreading member 8, and the outer peripheral surface 15 of the abutting portion 12 is securely attached to the inner peripheral surface 4 of the hole 2. The anchor bolt 30 can be reliably fixed to the hole 2 by friction between the outer peripheral surface 15 of the contact portion 12 and the inner peripheral surface 4 of the hole 2.

When at least one pair of the

contact portions

12 and 12 and the

connection portions

13b and 13b of the bridging portion 13 that face each other are provided, the

connection portions

13b and 13b and the

contact portions

12 and 12 that form a pair are the inner peripheral surfaces 4 of the holes 2. Are pressed in opposite directions, and the expanding member 8 is in the inner peripheral surface of the hole 2 in a state where the central axis of the expanding member 8 is substantially along the central axis of the hole 2 due to the repulsive force at that time. 4 is held. Thereby, the outer peripheral surface 15 of each contact part 12 of the expansion member 8 can be pressed almost equally against the inner peripheral surface 4 of the hole 2, and the anchor bolt 30 can be appropriately fixed to the hole 2.

When the anchor bolt 30 has the holder 16, when the anchor bolt 30 is inserted into the hole 2 and the holder 16 is inserted into the hole 2, the rod 3 is held by the holder 16 and the anchor bolt 30. Swaying in the horizontal direction (for example, the front-rear direction and the left-right direction) can be reliably suppressed. Moreover, when the holder 16 is inserted into the hole 2, the protrusion 16 a of the holder 16 abuts against the edge of the opening of the hole 2, thereby preventing the holder 16 from entering too far into the hole 2. Therefore, the holder 16 can be retained in the vicinity of the opening of the hole 2 that can most effectively suppress the swinging motion of the anchor bolt 30 in the lateral direction, and the swinging motion of the rod 3 can be reliably suppressed. Thereby, the fixed state in the hole 2 of the anchor bolt 30 can be reliably maintained.

When the holding portion 24 is formed on the rod 3, the holding portion 24 can reliably suppress the lateral movement of the anchor bolt 30 'by simply inserting the anchor bolt 30' into the hole 2.

It is a front view which shows one Example of the anchor bolt which concerns on this invention. It is a longitudinal cross-sectional view of the anchor bolt of this invention. It is a front view of the taper member concerning the anchor bolt of this invention. It is a top view of the bridge part concerning the anchor bolt of the present invention. FIG. 5 is a cross-sectional view taken along line AA in FIG. 4. It is a longitudinal cross-sectional view for demonstrating the procedure which attaches the anchor bolt of this invention to a hole. It is a longitudinal cross-sectional view which shows the state which mounted | wore the anchor bolt of this invention in the hole. It is a longitudinal cross-sectional view which shows the other Example of the anchor bolt of this invention. It is a longitudinal cross-sectional view which shows the other Example of the anchor bolt of this invention.

An embodiment of an anchor bolt according to the present invention will be described with reference to FIGS. The anchor bolt 30 is inserted into a hole 2 provided (provided) in a wall surface 1 of a concrete ceiling, for example, and fixed (mounted) (see FIG. 7).

As shown in FIGS. 1 and 2, the anchor bolt 30 is attached to the tip end (upper end in FIG. 1) of the cylindrical rod 3, and the anchor bolt 30 is attached to the inner peripheral surface 4 (FIG. 6), an expansion mechanism 5 is fixed. The expansion mechanism 5 includes a taper member 7 that has a female screw 6 formed in a penetrating manner along the central axis, and an expansion member 8 that is externally fitted to the taper member 7. The taper member 7 and the rod 3 are connected by the male screw 9 formed on the outer peripheral surface of the rod 3 being screwed to the female screw 6 of the taper member 7.

The outer peripheral surface of the taper member 7 has a cylindrical surface shape. The planar inclined surfaces 11 shown in FIGS. 2 and 3 are formed at equal intervals in the circumferential direction of the taper member 7 at four locations on the outer circumferential surface of the taper member 7. In other words, among the four inclined surfaces 11, the pair of left and right

inclined surfaces

11, 11 are arranged at positions facing each other, and similarly, the pair of

inclined surfaces

11, 11 are arranged at positions where the pair of

inclined surfaces

11, 11 face each other. Will be. Each inclined surface 11 of the taper member 7 is inclined so as to approach the central axis of the taper member 7 toward the proximal end side (lower side in FIG. 2). The inclined surface 11 of the taper member 7 may not be formed up to the tip (upper end in FIG. 2) and the base end (lower end in FIG. 2) of the taper member 7.

As shown in FIGS. 2 and 5, the expanding member 8 has four abutments on the front, rear, left, and right that respectively form inclined surface-like inner surfaces 14 that can come into surface contact with the inclined surfaces 11 of the taper member 7. Part 12 and an elastically deformable bridging part 13 connecting (fixing) the tip part (upper side in FIG. 2) of each contact part 12. Specifically, among the four contact portions 12, the pair of left and

right contact portions

12 and 12 are arranged at positions facing each other corresponding to the pair of left and right

inclined surfaces

11 and 11 of the taper member 7, and similarly. Further, the pair of front and

rear contact portions

12 and 12 are arranged at positions facing each other corresponding to the pair of front and rear

inclined surfaces

11 and 11 of the taper member 7.

The inner surface 14 of each contact portion 12 is in surface contact with each inclined surface 11 of the taper member 7 (the state shown in FIG. 7), and the anchor bolt 30 (taper member 7 is tapered toward the proximal end side of the anchor bolt 30. ) To be closer to the central axis. The inclination angle of the inner surface 14 of each contact portion 12 is substantially equal to the inclination angle of each inclined surface 11 of the taper member 7.

The bridging portion 13 includes a thin plate-like main body portion 13a disposed on the distal end side (upper side in FIG. 2) of the taper member 7 in the expanding member 8, and an edge (see FIG. 4) of the main body portion 13a. Each of the contact portions 12 has four thin plate-like connection portions 13b that extend to the tip side (upper side in FIG. 2) and connect the tip portions of the contact portions 12 respectively.

As shown in FIG. 5, the connecting portion 13b is caulked in a state where its free end (lower end in FIG. 5) is fitted in a notch 12a formed on the outer surface side of the front end of the contact portion 12. The contact portion 12 is fixed by the above. In addition, the free end part of the connection part 13b of the bridge | bridging part 13 and the front-end | tip part of the contact part 12 may be fixed with a bis | screw etc., and may be fixed with a welding system etc.

As shown in FIG. 4, the main body part 13 a of the bridging part 13 has a substantially square shape, and the connection parts 13 b are connected (connected) to the four apex parts (corner parts). ). Of the four connecting portions 13b of the bridging portion 13, a pair of left and right connecting

portions

13b and 13b are provided at positions facing each other corresponding to the pair of left and right abutting

portions

12 and 12, and similarly a pair of front and rear connections The

portions

13b and 13b are provided at positions facing each other corresponding to the pair of front and

rear contact portions

12 and 12.

The main body portion 13a has a dimension L2 between the connecting portions of the connecting

portions

13b and 13b at positions facing each other smaller than the diameter L1 of the hole 2, whereby the main body portion 13a and the connecting portion of the bridging portion 13 are connected. The connecting portion side 13b (upper side in FIG. 6) of 13b can be easily inserted into the hole 2. The main body portion 13a may be circular, for example. In this case, the diameter of the main body portion 13a is made smaller than the diameter L1 of the hole 2.

As shown in FIG. 5, each connection site 13 b of the bridging portion 13 is obliquely lowered from the edge of the main body portion 13 a to the outside of the bridging portion 13 in a state before the expansion member 8 is externally fitted to the taper member 7. After extending in the direction, it is bent inward of the bridging portion 13 in the middle of the length direction. Each of the connection parts 13b is in a state in which the expanding member 8 is externally fitted to the taper member 7 as shown in FIG. 2, that is, in a free state before inserting the anchor bolt 30 into the hole 2 (state in FIG. 2). The bent state is maintained.

The distance L3 between the bent portions of the pair of connecting

portions

13b and 13b in the front and rear and left and right in the free state is the diameter L1 of the hole 2 in all the width directions at the bent portions of the pair of connecting

portions

13b and 13b. Is bigger than. In particular, the distance L3 that is a diagonal line in the plan view shown in FIG. 4 is the maximum at the bent portions of each pair of

connection parts

13b and 13b, and the distance L3 of the diagonal line is larger than the diameter L1 of the hole 2. Yes. Thus, when the anchor bolt 30 is inserted into the hole 2, the middle in the vertical direction of each connection portion 13b reliably contacts the edge of the opening of the hole 2 (state of FIG. 6).

In the state of FIG. 6, the anchor bolt 30 is forcibly pushed into the hole 2, so that the intermediate portion of the connection portion 13 b is formed by the edge of the opening of the hole 2 or the inner peripheral surface 4 of the hole 2. It is pushed inward (taper member 7 side) and elastically deforms, and the intermediate portion and the contact portion 12 of the connection portion 13b are pressed against the inner peripheral surface 4 of the hole 2 by the elastic restoring force at that time.

The outer peripheral surface 15 of each contact portion 12 is formed in a cylindrical surface shape similar to the inner peripheral surface 4 of the hole 2, whereby the outer peripheral surface 15 of the contact portion 12 becomes the inner peripheral surface 4 of the hole 2. Surface contact is possible. The inner surface 14 of the contact portion 12 may not be formed in an inclined shape up to the distal end (upper end in FIG. 5) and the base end (lower end in FIG. 5).

ロッド Equipment equipment and piping not shown are attached to the rod 3. The rod 3 and the taper member 7 are made of stainless steel or the like. The contact portion 12 of the spreading member 8 is made of aluminum alloy or the like, and the bridging portion 13 is made of stainless steel or the like.

As shown in FIG. 1, a plurality of (two in this embodiment) grooves 17 are formed in the lower part (free end side) of the outer peripheral surface 15 of each contact part 12 of the expanding member 8. 12 are formed side by side in the length direction (vertical direction in FIG. 1), and the groove 17 extends in 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 the spreading mechanism 5 facing upward, and inserts the anchor bolt 30 into the hole 2 in the wall surface 1 from the bridging portion 13 side of the spreading mechanism 5. At that time, the connection part 13b of the bridging portion 13 abuts on the edge of the opening of the hole 2 (see FIG. 6), but the connection part 13b is elastically deformed by forcibly pushing the anchor bolt 30 into the hole 2. Thus, the spreading mechanism 5 enters the hole 2.

In this state, the anchor bolt 30 is inserted until the main body portion 13a of the bridging portion 13 comes into contact with the upper surface 20 of the hole 2 (state shown in FIG. 7). In that case, the intermediate part and the contact part 12 of the connection part 13b are pressed against the inner peripheral surface 4 of the hole 2 by the elastic restoring force of the connection part 13b.

Next, when the rod 3 is pulled toward the opening side of the hole 2 (the base end side of the anchor bolt 30: the lower side in FIG. 7), the taper member 7 of the expansion mechanism 5 is lowered (moved) together with the rod 3 to the opening side of the hole 2. ) In that case, since the intermediate part and the contact part 12 of the connection part 13b are pressing against the inner peripheral surface 4 of the hole 2 as mentioned above, the expansion member 8 may descend along with the taper member 7. It can be suppressed. Further, since the contact portion 12 is pressed against the inner peripheral surface 4 of the hole 2, the upper and lower edges of the groove 17 of the contact portion 12 are caught by the inner peripheral surface 4 of the hole 2, thereby expanding. The member 8 is restrained from descending along with the taper member 7.

Thereby, each inclined surface 11 of the taper member 7 is pressed against the inner surface 14 of each contact portion 12 of the spreading member 8, and the outer peripheral surface 15 of each contact portion 12 is firmly attached to the inner peripheral surface 4 of the hole 2. Can be pressed. As a result, the anchor bolt 30 can be reliably fixed (temporarily fixed) to 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.

Thereafter, for example, when the rod 3 is rotated and the taper member 7 is moved to the proximal end side of the anchor bolt 30 by a screw action, the inner surface 14 of each contact portion 12 of the hole 2 is formed by each inclined surface 11 of the taper member 7. It is further pushed toward the inner peripheral surface 4 side, and the outer peripheral surface 15 of each contact portion 12 is strongly pressed against the inner peripheral surface 4 of the hole 2, so that the anchor bolt 30 is firmly fixed by the hole 2.

A bracket 21 (FIG. 7) for fixing equipment and piping (not shown) is attached to the male screw 9 of the rod 3 of the anchor bolt 30, and a nut 22 (FIG. 7) is screwed under the bracket 21. Wear (wear). Then, the nut 22 is tightened with a tool such as a wrench (spanner) to attach the bracket 21 to the anchor bolt 30.

When the nut 22 is tightened, the rod 3 is further pulled downward, and the rod 3 and the taper member 7 of the expansion mechanism 5 are further lowered. As a result, the inner surface 14 of each contact portion 12 is further pressed by the inclined surface 11 of the taper member 7 toward the inner peripheral surface 4 side of the hole 2 in a state of surface pressure contact, and the outer peripheral surface 15 of each contact portion 12 becomes the hole 2. The anchor bolt 30 is firmly fixed to the inner peripheral surface 4 by the hole 2. Instead of the bracket 21, a washer (not shown) may be mounted on the nut 22.

Even if the rod 3 of the anchor bolt 30 fixed to the hole 2 is pulled downward due to the weight of the equipment or the like, each inclined surface 11 of the taper member 7 moves along the inner surface 14 of each contact portion 12 accordingly. Since it pushes strongly, the outer peripheral surface 15 of each contact part 12 is strongly pressed against the inner peripheral surface 4 of the hole 2. Thereby, the anchor bolt 30 can be reliably prevented from coming out of the hole 2.

In the description of the embodiment, two pairs of

inclined surfaces

11 and 11 are formed on the taper member 7, and two pairs of

contact portions

12 and 12 are arranged in accordance therewith. Only the

inclined surfaces

11 and 11 may be formed, and only the pair of

contact portions

12 and 12 may be arranged in accordance with the

inclined surfaces

11 and 11. In addition, three or more pairs of

inclined surfaces

11 and 11 may be formed on the taper member 7 and three or more pairs of

contact portions

12 and 12 may be disposed in accordance with the

inclined surfaces

11 and 11. The bridging portion 13 of the spreading member 8 only needs to be elastically deformable at least at the connection site 13b, and the entire bridging portion 13 may be elastically deformable. A convex portion (not shown) may be provided on the outer peripheral surface 15 of the contact portion 12 instead of or together with the groove 17 of each contact portion 12 of the spreading member 8.

Further, one or a plurality of spreading mechanisms 5 may be arranged not only at the tip of the rod 3 but also in the middle in the length direction of the rod 3. In that case, a through hole for passing the rod 3 is provided in the main body portion 13a of the bridging portion 13 of the spreading member 8 in the spreading mechanism 5 located in the middle of the length direction of the rod 3.

Thus, when the anchor bolt 30 is inserted into the hole 2, the connection part 13 b is pressed against the inner peripheral surface 4 of the hole 2 by the elastic restoring force of the connection part 13 b of the bridging portion 13 of the spreading member 8. Thus, the spreading member 8 (bridge portion 13) is firmly held on the inner peripheral surface 4 of the hole 2 by friction or the like. As a result, the expansion member 8 is restrained from descending as the rod 3 (taper member 7) descends, and the inclined surface 11 of the taper member 7 is made to correspond to the inner surface of the contact portion 12 of the expansion member 8 accordingly. 14, so that the anchor bolt 30 can be securely fixed to the hole 2.

8 may be arranged on the rod 3 of the anchor bolt 30. The cylindrical holder 16 shown in FIG. The holder 16 allows the rod 3 to be inserted, and is held at the end portion (lower end portion in FIG. 8) which becomes the opening side of the hole 2 when inserted into the hole 2 (state of FIG. 8). An annular projecting portion 16 a that projects in the radial direction (lateral direction) of the tool 16 is provided. The holder 16 is made of steel or synthetic resin.

The protrusion 16 a of the holder 16 has an end surface (upper surface in FIG. 8), which is the back side of the hole 2 when inserted into the hole 2, toward the back side of the hole 2 toward the central axis side of the holder 16. It is formed in the shape of an inclined surface (tapered surface shape) that approaches. Moreover, the edge of the upper end of the holder 16 is formed in the inclined surface shape (taper surface shape).

The inner diameter of the holder 16 is slightly larger than the outer diameter of the rod 3 of the anchor bolt 30. As a result, the rod 3 of the anchor bolt 30 can be inserted through the inside of the holder 16 with almost no resistance, and the rod 3 is held only by the small gap between the inner peripheral surface of the holder 16 and the rod 3. Movement in the lateral direction with respect to the tool 16 is suppressed. The holder 16 has an outer diameter at the protrusion 16 a larger than the inner diameter of the hole 2, and the protrusion 16 a contacts the edge of the opening of the hole 2 when the holder 16 is inserted into the hole 2. I try to touch. As a result, the holder 16 does not excessively enter the deeper side of the hole 2 than the position of the opening of the hole 2.

Then, the holder 16 in a posture with the projecting portion 16a down is fitted to the rod 3 of the anchor bolt 30, and the position of the opening of the hole 2 (hereinafter, referred to as the bottom surface of the holder 16 is substantially flush with the wall surface 1). The holding tool 16 is inserted into the hole 2 (pressed in) until it reaches a predetermined position, and is mounted (retained) at the position of the opening of the hole 2. At the time of the mounting, the protruding portion 16a of the holder 16 is in contact with the edge of the opening of the hole 2 (the state shown in FIG. 8).

Since the edge of the upper end of the holder 16 is formed into an inclined surface, the holder 16 can be smoothly inserted into the hole 2. Since the upper surface of the protrusion 16a of the holder 16 is formed into an inclined surface, when the holder 16 is inserted into the hole 2, the protrusion 16a bites into the edge of the opening of the hole 2 and enters the opening of the hole 2. It becomes easy to keep. By arranging the holder 16 on the rod 3, it is possible to prevent the rod 3 from swinging in the lateral direction (front-rear direction and left-right direction), and the equipment fixed to the rod 3 is wobbled by the swing of the rod 3. Etc. are suppressed.

The holder 16 is preferably located at the opening of the hole 2, but may slightly enter the inner side of the hole 2 than the opening of the hole 2, and slightly protrude from the opening of the hole 2. May be. The holder 16 may have a cut extending in the axial direction (vertical direction in FIG. 8). The protrusion 16 a may be formed only on a part of the entire circumference of the peripheral surface of the holder 16.

A groove may be formed in the circumferential direction of the inner peripheral surface of the holder 16, and a ring-shaped elastic body made of easily deformable fluorine rubber, nitrile rubber, or the like may be disposed in the groove. The elastic body can come into contact with the rod 3 of the anchor bolt inserted through the holder 16. The elastic body may be a synthetic resin that is easily plastically deformed.

As shown in FIG. 9, a cylindrical holding portion 24 having a diameter approximately equal to or slightly smaller than the diameter L1 of the hole 2 is provided (formed) at an intermediate position in the longitudinal direction of the rod 3. Also good. The holding portion 24 is preferably located close to the opening of the hole 2 when the anchor bolt 30 'is inserted into the hole 2 (state shown in FIG. 9). It's okay.

Thus, even when the holding portion 24 is provided on the rod 3, the rod 3 can be prevented from swinging in the lateral direction (front-rear direction and left-right direction).

DESCRIPTION OF SYMBOLS 1 Wall surface 2 Hole 3 Rod 4 Inner peripheral surface 7 Taper member 8 Expanding member 11 Inclined surface of taper member 12 Abutting part of expanding member 13 Bridging part of expanding member 13a Main body part 13b Connecting part 14 Abutting part Inner surface 15 outer peripheral surface of contact portion 16 holder 16a protrusion of holder 24

holder

30 and 30 ′ anchor bolt L1 diameter of hole L3 distance between bent portions of each pair of connection parts

Claims

An anchor bolt (30) for being inserted and fixed in a hole (2) provided in the wall surface (1),
The expansion member (8) is externally fitted to the taper member (7) connecting the rod (3),
On the outer peripheral surface of the taper member (7), an inclined surface (11) is formed which is inclined so as to approach the central axis of the taper member (7) toward the proximal end side.
The spreading member (8) includes an abutting portion (12) that forms an inclined inner surface (14) that can come into surface contact with the inclined surface (11) of the tapered member (7), and the abutting portion thereof. An elastically deformable bridge portion (13) connecting the portions (12),
The bridging portion (13) extends from the edge of the main body portion (13a) and the main body portion (13a) to the abutting portion (12) side. A connecting portion (13b) connecting the tip of the contact portion (12),
The connection part (13b) extends obliquely from the edge of the main body part (13a) to the outside of the bridge part (13) and then inward of the bridge part (13) in the middle of the length direction. When the tip of the contact part (12) is connected after being bent and the anchor bolt (30) is inserted into the hole (2), the intermediate part of the connection part (13b) is the hole. (2) The edge of the opening and the inner peripheral surface (4) of the hole (2) are pushed and elastically deformed, and the elastic restoring force at that time causes the intermediate portion and the contact portion ( An anchor bolt (30), wherein 12) presses against the inner peripheral surface (4) of the hole (2).
At least a pair of the inclined surfaces (11) and (11) are formed on the outer peripheral surface of the taper member (7), and the inclined surfaces (11) and (11) to be paired are in positions facing each other. Have placed
The abutting portions (12) are arranged in at least one pair corresponding to the pair of the inclined surfaces (11) and (11),
At least one pair of connection parts (13b) of the bridging part (13) is provided corresponding to the pair of the contact parts (12) and (12)
In a free state before inserting the anchor bolt (30) into the hole (2), the distance (L3) between the bent portions of the paired connection parts (13b) and (13b) is the diameter of the hole (2). The anchor bolt (30) according to claim 1, wherein the anchor bolt (30) is larger than (L1).
A cylindrical holder (16) that allows the rod (3) of the anchor bolt (30) to be inserted;
The holder (16) is provided with a projecting portion (16a) projecting in the lateral direction at an end portion on the opening side of the hole (2) when inserted into the hole (2). The anchor bolt (30) according to claim 1 or 2, wherein the outer diameter at (16a) is larger than the diameter (L1) of the hole (2).
A holding portion (24) is formed at an intermediate position in the longitudinal direction of the rod (3), and the holding portion (24) is fixed by inserting the anchor bolt (30 ′) into the hole (2). The anchor bolt (30 ') according to claim 1 or 2, characterized in that the anchor bolt (30') is arranged at a position where it comes into the hole (2).