JP6231506B2 - Anchor bolt - Google Patents

Description

  The present invention relates to an anchor bolt fixed in a mounting hole provided in a concrete wall or the like.

When attaching other parts or structures to concrete walls, etc., there is a wide variety of methods for fixing anchor bolts in the mounting holes provided in the concrete wall and attaching other parts or structures to the anchor bolts. It has been implemented. The mounting hole includes a pore having an opening directed toward the wall surface and a diameter-expanded hole portion formed in the back of the pore. The anchor bolt extends in a long shape, and includes a shaft body in which a diameter-expanded portion having a tapered outer peripheral surface corresponding to the diameter-expanded hole portion is formed at a tip portion and a bolt is formed at the other end portion ( (See Patent Document 1). A sleeve whose front end bends outward along the enlarged diameter portion is slidably fitted to the outside of the shaft body with friction. The diameter of the pore is substantially the same as the diameter of the expanded portion of the anchor bolt and the outer diameter of the sleeve.
When the anchor bolt is fixed in the mounting hole, the expanded diameter portion is inserted into the hole in a state where the sleeve is pulled away from the expanded diameter portion. The sleeve is driven toward the concrete wall or the like in a state where the expanded portion reaches the expanded hole portion. While the distal end portion of the sleeve bends outward along the enlarged diameter portion, the sleeve advances toward the enlarged diameter hole portion and fills the gap between the enlarged diameter portion and the enlarged diameter hole portion. Thereby, the anchor bolt is fixed in the mounting hole. When other parts or structures are fitted through the bolts of the anchor bolts, nuts are fitted into the bolts, and the nuts are rotated, the other parts or structures are attached to the concrete wall or the like.

Utility model publication gazette No. 5-17214

The outer peripheral surface of the sleeve fitted into the shaft body of the anchor bolt is in contact with the inner peripheral surface of the mounting hole. The shaft body and the sleeve are brought into contact with friction, and the sleeve is fixed to the inner peripheral surface of the mounting hole, so that when the nut fitted to the bolt of the shaft body is rotated, the shaft body and the sleeve do not rotate smoothly. The nut can be screwed together.
However, the frictional force between the outer peripheral surface and the inner peripheral surface of the sleeve varies due to variations in the inner diameter of the inner peripheral surface. Therefore, when the nut is fitted to the bolt and the nut is rotated, the sleeve in contact with the shaft body is rotated. That is, the shaft body and the sleeve rotate together in the mounting hole, and the nut may not be tightened well. In this case, the nut is rotated while hooking the tip of the bolt to prevent the shaft from rotating, but it is necessary to rotate the nut with one hand and hold the spanner with the other hand. It took time and effort.
An object of the present invention is to provide an anchor bolt that prevents a shaft body and a sleeve from rotating together when the nut is fitted to the bolt and the nut is rotated.

An anchor bolt inserted into a mounting hole established on the wall surface,
It extends along the axis, and has a diameter-expanded portion at the tip and a bolt at the other end, and the diameter-expanded portion expands outward as the outer peripheral surface goes in the direction of insertion into the mounting hole. A shaft formed in a tapered shape;
A sleeve that is a hollow body that is in contact with the outer peripheral surface of the shaft body, and includes a sleeve having a deployment piece formed in a distal end portion that is in a deployed state when bent outwardly;
When the state in which the sleeve covers the shaft body is set to the first state of the shaft body and the sleeve so that the deployment piece is in the non-deployed state,
The sleeve is inserted into the mounting hole from the state where the shaft body and the sleeve in the first state are inserted into the mounting hole and the tip of the shaft body is in contact with the bottom of the mounting hole. By being pushed further in the direction, the unfolded piece is bent outward along the expanded diameter portion to be unfolded,
A first groove is formed in the outer peripheral surface of the sleeve, and a ring that contacts the inner wall of the mounting hole is fitted in the first groove.

Further, the sleeve is formed with a through hole that communicates the first concave groove and the hollow portion of the sleeve,
On the peripheral surface of the shaft body, a second concave groove is formed at a position corresponding to the through hole in the first state,
The ring is formed with a fitting piece extending so as to reach the second concave groove through the through hole in the first state,
A connecting means for connecting the shaft body and the sleeve in the first state is constituted by the fitting piece.

1. Since the ring fitted in the first concave groove is in contact with the inner peripheral wall of the mounting hole, if the sleeve is inserted into the mounting hole in a state where the sleeve is inserted into the shaft body, the friction force between the ring and the inner peripheral wall causes the sleeve. Is prevented from rotating. Even when the sleeve is further pushed in the insertion direction with the tip of the shaft body in contact with the bottom of the mounting hole, the shaft body and the sleeve are brought into contact with each other by friction, and the shaft body is fixed to the sleeve in the rotational direction.
That is, the ring prevents the sleeve from rotating with respect to the mounting hole, and the shaft and the sleeve are prevented from rotating with each other by friction. Accordingly, when the nut is fitted to the shaft body and rotated, the shaft body and the sleeve can be prevented from rotating together.
2. In a state where the sleeve is covered with the shaft body, the sleeve and the shaft body are connected by a fitting piece of a ring made of an elastic material. In this state, when the sleeve is further pushed in the insertion direction, the ring fitted in the first groove is also pushed together with the sleeve. A part of the fitting piece is disengaged from the second concave groove and rides on the peripheral surface of the shaft body. A part of the fitting piece that rides on the peripheral surface of the shaft body is deformed by being sandwiched between the outer peripheral surface of the sleeve and the inner peripheral wall of the mounting hole. The ring is sandwiched between the inner peripheral wall of the mounting hole and the peripheral surface of the shaft body, and is stretched. Thereby, the rotation of the sleeve and the rotation of the shaft body with respect to the mounting hole is prevented, and the shaft body and the sleeve can be prevented from rotating together when the nut is fitted to the shaft body for rotation.

It is sectional drawing which fractured | ruptured the anchor bolt partially. It is sectional drawing of an attachment hole. It is sectional drawing which expands and shows a ring and a 1st ditch | groove. It is a figure which shows the attachment process to the attachment hole of an anchor bolt. It is a figure which shows the attachment process to the attachment hole of an anchor bolt. It is an exploded view of the anchor bolt concerning another embodiment. FIG. 7 is a cross-sectional view of the sleeve of FIG. 6 taken along the plane including the line CC and viewed from the direction of the arrow, and a ring. It is sectional drawing which fractured | ruptured the anchor bolt of the assembly state partially. It is sectional drawing which fractured | ruptured the anchor bolt of FIG. 8 in the surface containing an AA line, and was seen by the arrow. (a)-(d) is sectional drawing which shows the procedure which inserts an anchor bolt in an attachment hole. It is a figure which expands and shows the bulging part of a fitting piece.

(First embodiment)
Hereinafter, an anchor bolt according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description is omitted.
FIG. 1 is a cross-sectional view in which an anchor bolt 1 according to the present embodiment is partially broken. As described above, the anchor bolt 1 is fixed in the mounting hole drilled in the concrete wall surface. The anchor bolt 1 extends in a long shape along the axis L, and is in contact with a shaft body 2 having a diameter-expanded portion 20 formed at the tip portion and a bolt 21 formed at the other end portion, and an outer peripheral surface of the shaft body 2. A hollow sleeve 3 that is inserted from the other end of the shaft body 2 so as to be covered, that is, from the bolt 21 side, and is provided with a deployment piece 31 that bends outward along the enlarged diameter portion 20, that is, in a deployed state. And.

The shaft body 2 and the sleeve 3 are both made of metal, and the inner diameter of the hollow portion 37 of the sleeve 3 is substantially equal to the diameter of the shaft body 2. The enlarged-diameter portion 20 is formed in a tapered shape whose outer peripheral surface extends outward in the direction of insertion into the mounting hole. The maximum diameter of the enlarged diameter portion 20 is substantially equal to the outer diameter of the sleeve 3.
In the sleeve 3, a plurality of development pieces 31 provided in the circumferential direction are provided at the distal end portion of the sleeve main body 30 via thin-walled connecting portions 32. Adjacent development pieces 31 are separated from each other by slits 33 extending along the axis L.
A recess 34 is provided on the outer peripheral surface of the sleeve 3, and the bottom surface of the shaft 2 is plastically deformed by striking the bottom surface of the recess 34 inward while the sleeve 3 is inserted into the shaft body 2. Cut into the circumference (see Fig. 4). As a result, the sleeve 3 and the shaft body 2 are coupled and rotate integrally around the axis L. That is, the bottom surface of the recess 34 constitutes the “connection means” of the present invention. In a state where the sleeve 3 and the shaft body 2 are connected, the distal end of the deployment piece 31 is positioned at the proximal end portion of the diameter-expanded portion 20, and the deployment piece 31 has not yet deployed. This state is the first state.
On the peripheral surface of the sleeve 3, a first concave groove 35 is opened away from the recess 34, and a metal ring 4 that is in contact with the inner peripheral wall of the mounting hole is fitted in the first concave groove 35.

FIG. 2 is a cross-sectional view of the mounting hole 8 drilled in the concrete wall surface 85. The mounting hole 8 includes a pore 80 whose opening is directed to the wall surface 85, and a diameter-enlarged hole portion 81 formed in the inner portion of the pore 80. The diameter D of the pore 80 is formed so as to be much larger than the maximum diameter of the enlarged diameter portion 20 and the outer diameter of the sleeve 3, so that the enlarged diameter portion is in a state where the sleeve 3 and the shaft body 2 are connected. 20 and the sleeve 3 can be inserted into the pore 80.
The diameter D1 of the ring 4 is larger than the diameter D of the pores 80. The enlarged-diameter hole 81 has a shape corresponding to the enlarged-diameter portion 20 of the shaft body 2, and the maximum diameter D <b> 2 is substantially equal to the size obtained by adding the thickness of the development piece 31 to both sides of the maximum diameter of the enlarged-diameter portion 20. . Since the shape of the mounting hole 8 is the same as the conventional one, and the method of forming the mounting hole 8 is well known, the description is omitted here.
FIG. 3 is an enlarged cross-sectional view showing the ring 4 and the first concave groove 35. A gap S is formed between the inner diameter of the ring 4 and the bottom surface of the first concave groove 35, and the ring 4 can be elastically deformed inward by the gap S.

(Mounting the anchor bolt to the mounting hole)
To assemble the anchor bolt 1 and attach it to the attachment hole 8, the following procedure is used. First, the sleeve 3 is inserted into the shaft body 2 until the distal end of the deployment piece 31 is positioned at the proximal end portion of the enlarged diameter portion 20 (the first state). The bottom surface of the dent 34 is beaten inward so that the bottom surface bites into the peripheral surface of the shaft body 2, and the sleeve 3 and the shaft body 2 are connected. Thereby, as shown in FIG. 4, the anchor bolt 1 is completed.
Next, the anchor bolt 1 is inserted along the insertion direction F into the mounting hole 8 shown by a one-dot chain line in FIG. Since the diameter D1 of the ring 4 is much larger than the diameter D of the pore 80, the ring 4 is elastically deformed inward by the gap S at the maximum. The anchor bolt 1 is inserted against the friction between the ring 4 and the peripheral wall of the pore 80. When the distal end surface of the enlarged diameter portion 20 comes into contact with the inner surface of the enlarged diameter hole portion 81, the shaft body 2 cannot be inserted any more, and the shaft body 2 is in an insertion completed state.

Next, as shown in FIG. 5, the end surface 3 a of the sleeve 3 is beaten from the outside of the wall surface 85 with a hammer (not shown) or the like, and only the sleeve 3 is directed toward the enlarged-diameter hole portion 81. Push into F. That is, the sleeve 3 is pushed toward the diameter expansion hole 81 so that the connection between the bottom surface of the recess 34 and the peripheral surface of the shaft body 2 is released. However, even after the bottom surface of the recess 34 and the peripheral surface of the shaft body 2 are disconnected, the bottom surface of the recess 34 and the peripheral surface of the shaft body 2 are in contact with each other by friction. The rotation direction around L is fixed.
The development piece 31 is spread outward along the outer peripheral surface of the enlarged diameter portion 20 with the thin connection portion 32 serving as a fulcrum. This state is referred to as a second state. Thereby, the clearance gap between the enlarged diameter hole part 81 and the enlarged diameter part 20 is filled up with the expansion | deployment piece 31, and the shaft body 2 and the anchor bolt 1 are prevented from coming out of the attachment hole 8 in a 2nd state. In this state, if other parts, structures, etc. (not shown) are fitted through the bolts 21 of the shaft body 2, the nuts 9 indicated by alternate long and short dash lines are fitted to the bolts 21, and the nuts 9 are rotated, the concrete wall surface Other parts and structures are attached to 85.

  Since the ring 4 is in contact with the inner peripheral wall of the mounting hole 8, the rotation of the sleeve 3 is prevented by the frictional force between the ring 4 and the inner peripheral wall. The shaft body 2 connected to the sleeve 3 is also prevented from rotating about the axis L by the frictional force with the bottom surface of the recess 34. Thereby, when rotating the nut 9, it can prevent that the shaft body 2 and the sleeve 3 rotate together. Therefore, unlike the prior art, it is not necessary to prevent the rotation of the shaft body 2 by hooking the spanner on the tip of the bolt 21, and the workability when tightening the nut 9 is improved.

(Second embodiment)
The anchor bolt 1 in the first embodiment has an advantage over the prior art in that when the nut 9 is rotated, the shaft body 2 and the sleeve 3 are prevented from rotating together. However, due to the variation in the outer diameter of the ring 4, the frictional force between the ring 4 and the inner peripheral wall of the mounting hole 8 is not constant. That is, when the frictional force is large, the anchor bolt 1 is difficult to insert into the mounting hole 8, and the anchor bolt 1 is inserted into the mounting hole 8 until the tip surface of the expanded diameter portion 20 abuts the inner surface of the expanded diameter portion 81. May not be able to be inserted. On the other hand, when the frictional force is small, the anchor bolt 1 may drop out of the mounting hole 8 before the sleeve 3 is pushed toward the enlarged diameter hole portion 81. In particular, when the concrete wall surface 85 is a ceiling wall surface, this possibility increases.
Furthermore, although the shaft body 2 is connected to the sleeve 3 by plastic deformation of the bottom surface of the recess 34, the connecting force between the sleeve 3 and the shaft body 2 is not constant due to the variation in the amount of plastic deformation. Therefore, when the coupling force is large, there is a possibility that a situation where the sleeve 3 is difficult to push in may occur when the sleeve 3 is pushed away from the shaft body 2 toward the diameter-enlarged hole portion 81. Accordingly, the present inventor has conceived that the shaft body 2 and the sleeve 3 are connected by a synthetic resin ring 4 to eliminate these disadvantages.

FIG. 6 is an exploded view of the anchor bolt 1 according to the present embodiment. FIG. 7 is a cross-sectional view of the sleeve 3 of FIG. The mounting hole 8 into which the anchor bolt 1 is inserted is the same as that shown in FIG.
As in the first embodiment, the anchor bolt 1 is inserted from the shaft body 2 in which the enlarged diameter portion 20 is formed at the tip portion and the bolt 21 is formed at the other end portion, and the other end portion of the shaft body 2. And a sleeve 3 provided with a deployment piece 31 that bends outward along the enlarged diameter portion 20. As shown in FIG. 7, the first concave groove 35 formed in the circumferential surface of the sleeve 3 is continuous with a through hole 36 that reaches a hollow portion of the sleeve 3. The shaft body 2 is formed with a second concave groove 22 that overlaps the through hole 36 in the first state.

  In a state where the sleeve 3 is inserted into the shaft body 2 and the through hole 36 and the second groove 22 are overlapped, the ring 4 is fitted into the first groove 35 from the outside of the sleeve 3. In the present embodiment, the ring 4 is composed of two arc-shaped ring halves 40, and both the ring halves 40 are made of synthetic resin. A hook 41 is provided at both ends of each ring half 40, and both the ring halves 40 are combined with each other to constitute a ring 4. A plurality of recesses 42 are formed on the outer surface of each ring half 40 so as to be separated from each other, and the reason will be described later. Both ring halves 40 are fitted into the first concave groove 35 from opposite sides of the sleeve 3 to combine the hooks 41 facing each other. Since each ring half 40 can be separately fitted into the first concave groove 35, workability when the ring 4 is formed on the sleeve 3 is improved.

  As shown in FIG. 7, a fitting piece 43 protrudes inward from the center portion along the arc length of each ring half body 40. The fitting piece 43 passes through the through hole 36 in a state where the ring half body 40 is fitted in the first concave groove 35, and the tip part is fitted in the second concave groove 22 of the shaft body 2. Thereby, the shaft body 2 and the sleeve 3 are detachably coupled. That is, the ring half 40 and the ring 4 constitute the “connecting means” of the present invention.

8 is a cross-sectional view in which the anchor bolt 1 in an assembled state according to the present embodiment is partially broken, and FIG. 9 is a cross-sectional view in which the anchor bolt 1 in FIG. FIG.
The anchor bolt 1 is assembled by the following procedure. First, the sleeve 3 is inserted into the shaft body 2 until the distal end of the deployment piece 31 is positioned at the proximal end portion of the enlarged diameter portion 20. As described above, the through hole 36 and the second groove 22 overlap (see FIG. 8). In this state, the two ring halves 40 are fitted into the first concave groove 35 from the opposite sides to the sleeve 3. As shown in FIG. 9, the fitting piece 43 passes through the through hole 36 in a state where the ring half body 40 is fitted in the first concave groove 35, and the tip part is fitted in the second concave groove 22 of the shaft body 2. . By locking the hooks 41 of both ring halves 40, the ring 4 is formed, and the shaft body 2 and the sleeve 3 are detachably connected. In this state, the outer diameter of the ring 4 is much larger than the diameter D of the pore 80.

  Next, the anchor bolt 1 is inserted into the mounting hole 8. FIGS. 10A to 10D are sectional views showing this procedure. As shown in FIG. 10 (a), the outer diameter of the ring 4 is much larger than the diameter D of the pore 80, so the anchor bolt 1 is inserted against the friction between the ring 4 and the inner wall of the pore 80. The As shown in FIG. 10 (b), when the tip surface of the enlarged diameter portion 20 of the shaft body 2 comes into contact with the inner surface of the enlarged diameter hole portion 81, the shaft body 2 cannot be inserted any more, and the shaft The body 2 is in the insertion complete state.

  As in the first embodiment, in this state, as shown in FIG. 10 (c), the end surface 3a of the sleeve 3 is beaten with a hammer (not shown) or the like, and the sleeve 3 is expanded. Push toward 81. The ring 4 fitted in the first concave groove 35 is also pushed together with the sleeve 3. As shown in an enlarged view in FIG. 11, the fitting piece 43 disengages from the second concave groove 22 and rides on the peripheral surface of the shaft body 2. Further, since the fitting piece 43 rides on the peripheral surface of the shaft body 2, that is, moves so as to expand outward, a part of the fitting piece 43 is between the outer peripheral surface of the sleeve 3 and the inner peripheral wall of the mounting hole 8. To form a bulging portion 44. The sleeve 3 is pressed toward the shaft body 2 by the elastic force of the bulging portion 44. That is, the bulging portion 44 that is a part of the fitting piece 43 that is deformed while being fitted to the sleeve 3 fills the space between the outer peripheral surface of the sleeve 3 and the inner peripheral wall of the mounting hole 8, and the inner peripheral wall of the mounting hole 8. In frictional contact. The ring 4 is sandwiched between the inner peripheral wall of the mounting hole 8 and the peripheral surface of the shaft body 2 and is stretched. Thereby, the rotation of the sleeve 3 with respect to the mounting hole 8 and the rotation about the axis L of the shaft body 2 are prevented.

As shown in FIG. 10 (d), when other parts or structures 90 are fitted through the bolts 21 of the shaft body 2, the nut 9 is fitted to the bolt 21 and the nut 9 is rotated, the concrete wall 85 is Then, other parts and structures 90 are attached.
As described above, in the anchor bolt 1 according to the present embodiment, when the nut 9 is fitted to the shaft body 2 and rotated, the shaft body 2 and the sleeve 3 can be prevented from rotating together. Therefore, unlike the prior art, it is not necessary to prevent the rotation of the shaft body 2 by hooking the spanner on the tip of the bolt 21, and the workability when tightening the nut 9 is improved. The applicant mainly assumes that the anchor bolt 1 is attached to the attachment hole 8 provided in the ceiling wall, and when the nut 9 is fitted to the bolt 21 of the anchor bolt 1 attached to the ceiling wall and rotated. Improved workability.

  As described above, the plurality of recesses 42 are formed on the outer surface of the ring half 40 so as to be separated from each other. This is mainly because it is assumed that the anchor bolt 1 is attached to the concrete wall surface 85. As is well known, there are fine irregularities on the inner peripheral surface of the mounting hole 8 of the concrete wall surface 85. The concave portion 42 of the ring half body 40 is fitted into the irregularities on the inner peripheral surface of the mounting hole 8, and as a result, as shown in FIG. Can be further prevented from falling off the mounting hole 8. In particular, when the anchor bolt 1 is attached to the attachment hole 8 provided in the ceiling wall, the anchor bolt 1 can be prevented from dropping, which is effective.

In this embodiment, it is assumed that the anchor bolt 1 is attached to the concrete wall surface 85. However, the anchor bolt 1 of this embodiment can be attached to wall surfaces other than the concrete wall surface 85.
The first state is a state in which the distal end of the deployment piece 31 is located at the proximal end portion of the enlarged diameter portion 20. However, the first state may be a state in which the deployment piece 31 is in a non-deployment state, and may be a position where the distal end of the deployment piece 31 has moved from the proximal end portion of the enlarged diameter portion 20 in a direction opposite to the insertion direction.

  The present invention is useful when applied to an anchor bolt fixed in a mounting hole established in a concrete wall or the like.

DESCRIPTION OF SYMBOLS 1 Anchor bolt 2 Shaft body 3 Sleeve 4 Ring 8 Mounting hole 9 Nut 20 Diameter expansion part 22 2nd groove 31 Expanding piece 35 1st groove 43 Fitting piece

Claims (4)

An anchor bolt inserted into a mounting hole established on the wall surface,
It extends along the axis, and has a diameter-expanded portion at the tip and a bolt at the other end, and the diameter-expanded portion expands outward as the outer peripheral surface goes in the direction of insertion into the mounting hole. A shaft formed in a tapered shape;
A sleeve that is a hollow body that is in contact with the outer peripheral surface of the shaft body, and includes a sleeve having a deployment piece formed in a distal end portion that is in a deployed state when bent outwardly;
When the state in which the sleeve covers the shaft body is set to the first state of the shaft body and the sleeve so that the deployment piece is in the non-deployed state,
The sleeve is inserted into the mounting hole from the state where the shaft body and the sleeve in the first state are inserted into the mounting hole and the tip of the shaft body is in contact with the bottom of the mounting hole. By being pushed further in the direction, the unfolded piece is bent outward along the expanded diameter portion to be unfolded,
A first groove is formed in the outer peripheral surface of the sleeve, and a ring that is in contact with the inner wall of the mounting hole is fitted in the first groove, and the first groove and the hollow portion of the sleeve are fitted in the sleeve. A through hole communicating with the
On the peripheral surface of the shaft body, a second concave groove is formed at a position corresponding to the through hole in the first state,
The ring is formed with a fitting piece extending so as to reach the second concave groove through the through hole in the first state,
An anchor bolt in which a connecting means for connecting the shaft body and the sleeve in the first state is constituted by the fitting piece. The ring is formed from an elastic material;
The sleeve is inserted into the mounting hole from the state where the shaft body and the sleeve in the first state are inserted into the mounting hole and the tip of the shaft body is in contact with the bottom of the mounting hole. 2. The anchor bolt according to claim 1, wherein the fitting piece is pushed outward in the direction away from the second concave groove, thereby elastically deforming the ring so as to bulge outward. .   The anchor bolt according to claim 1 or 2, wherein a plurality of concave portions arranged in a circumferential direction are formed on an outer peripheral surface of the ring.   The anchor bolt according to any one of claims 1 to 3, wherein the ring is composed of two arc-shaped ring halves.

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