JP7089941B2 - Metal expansion anchor - Google Patents

Description

The present invention relates to metal expansion anchors.

Metal expansion anchors are used to attach various equipment, pipes, light sky, ducts, and other articles to the concrete skeleton that constitutes a building or structure. The metal expansion anchor is inserted into a hole formed in the concrete skeleton and fixed. The metal expansion anchor includes a shaft-shaped (rod-shaped) anchor bolt, an expansion member provided at one end of the anchor bolt, and a high nut provided at the other end of the anchor bolt. In the metal expansion anchor, when the high nut is tightened with one end side of the anchor bolt inserted into the hole together with the expansion member, the diameter expansion member expands radially outward. As a result, the diameter-expanding member bites into the inner peripheral surface of the hole, and the metal expansion anchor is fixed to the concrete skeleton. A shaft-shaped mounting bolt is screwed into the other end of the high nut of such a metal expansion anchor, and various devices, pipes, light ceilings, ducts, and other articles are mounted via the mounting bolt.

If the metal expansion anchor is not sufficiently fixed to the hole formed in the concrete skeleton, the anchor itself may wobble or fall out of the hole due to the load of the article or the like.
Further, if the mounting bolt is not sufficiently screwed into the high nut of the metal expansion anchor, the mounting bolt may wobble or the mounting bolt itself may fall off from the high nut due to the load of the article or the like. Therefore, when constructing the metal expansion anchor, it is necessary to surely fix the metal expansion anchor to the hole of the concrete frame, and when mounting various articles, it is necessary to surely screw the mounting bolt into the high nut. ..

However, the construction quality of the metal expansion anchor may differ depending on the proficiency level of the installer and the like. In addition, it is common for the mounting bolts to be mounted by a different builder from the anchor builder, but depending on the situation at the site, the erected anchor may be difficult to see, so it may be easier to see. desired. Therefore, it is necessary for the builder or manager to be able to visually confirm whether or not the metal expansion anchor and the mounting bolt have been installed reliably during and after the construction.

The following Patent Document 1 describes a metal expansion anchor having an annular fracture groove formed on the outer peripheral surface of a high nut. In this configuration, when a tool such as a socket wrench is engaged with a high nut to rotate the nut, if a torque of a predetermined value or more is applied to the high nut, a part of the high nut breaks in the break groove. By tightening the anchor bolts until the high nut breaks in the fracture groove, it is confirmed that the diameter expansion member is sufficiently expanded in the hole and the metal expansion anchor is firmly fixed.

Further, Patent Document 1 also discloses a configuration including a through hole penetrating the inner peripheral surface and the outer peripheral surface of the high nut, and a deforming material protruding from the through hole when the mounting bolt is screwed into the high nut. According to such a configuration, when a mounting bolt for mounting an article is screwed into the high nut of the metal expansion anchor fixed in the hole of the concrete skeleton, the deformable material protrudes from the outer peripheral surface of the nut through the through hole. As a result, whether or not the mounting bolt is sufficiently tightened to the high nut is confirmed by the presence or absence of protrusion of the deformable material.

Japanese Unexamined Patent Publication No. 2012-177290

In the metal expansion anchor as described above, in order to rotate the high nut in which the fracture groove is formed, only on the side of the fracture groove that is removed when the fracture groove is broken (the side separated from the concrete skeleton). It is necessary to engage tools such as sockets. If the tool straddles both the side that is removed when the fracture groove is broken and the side that remains on the concrete skeleton side across the fracture groove, the torque that causes the fracture does not occur in the fracture groove. Is. Therefore, when constructing the metal expansion anchor as described above, the depth of the socket is limited.
Further, after construction, a part of the high nut broken in the breaking groove becomes waste, and there is a problem that it takes time and effort to dispose of it.

In addition, the through hole is provided only in one place in the circumferential direction, and in order to confirm the presence or absence of protrusion of the deforming material due to the screwing of the mounting bolt to the high nut of the metal expansion anchor, check from the direction in which the vicinity of the through hole can be seen. There is a need to. Therefore, for example, when the anchor is installed on the ceiling, the installer or the manager will check it from a remote place, so that the visibility of the anchor is poor and it is difficult to visually confirm the construction.

In view of the above circumstances, the present invention can visually confirm the installation of the anchor and the installation state without requiring a special tool for construction, and visually confirm the installation status of the mounting bolt. One of the purposes is to provide a metal expansion anchor that can be performed.

One aspect of the metal expansion anchor of the present invention is an anchor bolt, a diameter-expanding member mounted on a first end portion of the anchor bolt in the central axis direction and having an expansion portion that can be deformed radially outward. A tapered portion provided at the first end portion of the anchor bolt and having a diameter-expanding surface for expanding the expansion portion, and a plurality of portions provided at the second end portion of the anchor bolt in the central axial direction in the circumferential direction. A nut member having a through hole, and a first deforming member provided on the first end side of the anchor bolt with respect to the nut member and expanding the diameter outward in the radial direction while being compressed in the central axial direction. The nut member has a plurality of arm portions that protrude outward from each of the plurality of through holes when the mounting bolt is screwed into the nut member to a predetermined position. A second deformable member is provided.

In the above embodiment, the second deformable member integrally has a base portion to which the tip of the mounting bolt abuts and the arm portion extending from the base portion to a position facing from the inside in the radial direction with respect to the plurality of through holes. Is preferable.

In the above embodiment, the arm portion integrally has an arm portion main body extending from the base portion and a large diameter portion provided at the tip end portion of the arm portion main body and having a diameter larger than that of the arm portion main body. preferable.

In the above aspect, it is preferable that the large diameter portion protrudes radially outward from the nut member in a state where the mounting bolt and the nut member have a predetermined fitting length or more.

In the above embodiment, a first intermediate member having an outer diameter larger than that of the first deformable member is provided between the nut member and the first deformable member, and the first deformable member is provided in the central axial direction. It is preferable that the diameter is expanded radially outward from the first intermediate member in the compressed state.

In the above embodiment, the second intermediate member provided on the side opposite to the first intermediate member of the first deformable member is further provided, and the second intermediate member is provided radially inside the first deformable member. A contact portion that comes into contact with the first deformable member, and a pedestal portion that is provided on the first end side of the anchor bolt with respect to the first deformable member and has an outer diameter larger than that of the first deformable member. , Are preferred.

In the above aspect, it is preferable that the first deformable member is made of a rubber-based material.

In the above embodiment, the diameter-expanding member has a return portion extending along the central axis direction, and the return portion has a first end portion side in the center axis direction connected to the diameter-expanding member. It is preferable that the second end side in the central axis direction is deformable in the radial direction.

According to one aspect of the present invention, there is provided a metal expansion anchor that allows a builder or a manager to visually check the installation and installation state of an anchor and the installation state of a mounting bolt without requiring a special tool for construction. Will be done.

FIG. 1 is a diagram showing the appearance of an anchor of one embodiment. FIG. 2 is a cross-sectional view of the anchor of one embodiment. FIG. 3 is a view showing a method of constructing an anchor according to an embodiment, and is a cross-sectional view showing a state in which the anchor is inserted into a prepared hole formed in a concrete skeleton. FIG. 4 is a view showing a method of constructing an anchor according to an embodiment, and is a cross-sectional view showing a state in which a high nut is tightened to expand a diameter-expanding member and the anchor is fixed in a prepared hole. FIG. 5 is a view showing a method of constructing an anchor according to an embodiment, and is a cross-sectional view showing a state in which a high nut is tightened and a rubber member is pushed outward in the radial direction. FIG. 6 is a view showing a method of constructing an anchor according to an embodiment, and is a cross-sectional view showing a state in which a mounting bolt is screwed in and an indicator member is projected outward in the radial direction from a through hole of a high nut. FIG. 7 is a diagram showing the appearance of the anchor of the modified example.

FIG. 1 is a diagram showing the appearance of an anchor of one embodiment. FIG. 2 is a cross-sectional view of the anchor of one embodiment.
As shown in FIGS. 1 and 2, the anchor 1 of the present embodiment includes an anchor bolt 2, a diameter-expanding member 3, a tapered portion 4, a high nut (nut member) 5, and a rubber member (first deformable member). ) 6 and an indicator member (second deformable member) 7 (see FIG. 2) are mainly provided. The anchor 1 of the present embodiment is a so-called wedge-type metal expansion anchor of a tightening method in which the diameter-expanding member 3 is expanded by tightening the high nut 5.

The anchor bolt 2 has a rod shape extending in the central axis C direction. A male screw portion 2n is formed on the outer peripheral surface of the anchor bolt 2 on the base end portion (second end portion) 2b side. A small diameter portion 2d having an outer diameter smaller than that of the intermediate portion 2c of the anchor bolt 2 is formed at the tip end portion (first end portion) 2a on one side of the central axis C direction of the anchor bolt 2.

The diameter-expanding member 3 is attached to the small-diameter portion 2d of the tip portion 2a of the anchor bolt 2. The diameter-expanding member 3 has a cylindrical shape as a whole. The diameter-expanding member 3 is formed with slits 3s extending in the central axis C direction at at least two positions spaced around the central axis C in the circumferential direction. The diameter-expanding member 3 includes an expansion portion 3t between the slits 3s adjacent to each other in the circumferential direction. The entire diameter-expanding member 3 including the expansion portion 3t has substantially the same outer diameter as the intermediate portion 2c of the anchor bolt 2. The extension portion 3t is pressed radially outward by the taper portion 4 described later, so that the tip portion 2a side of the anchor bolt 2 can be deformed radially outward. Further, the diameter-expanding member 3 has a convex portion 3a provided on the outer peripheral surface. The outer diameter of the convex portion 3a is slightly larger than the inner diameter of the prepared hole in which the anchor described later is constructed. The convex portion 3a regulates the rotation stop of the diameter-expanding member 3 in the prepared hole to which the anchor described later is constructed, and the position of the prepared hole in the depth direction.

The tapered portion 4 is provided at the tip portion 2a on one side of the anchor bolt 2 in the C direction of the central axis. The tapered portion 4 has a diameter-expanded surface 4f that extends radially outward from the proximal end portion 2b side on the other side in the central axis C direction toward the tip end portion 2a side on one side. The tapered portion 4 is inserted inside the diameter-expanding member 3 from the tip end portion 2a side of the anchor bolt 2 toward the base end portion 2b side. When the tapered portion 4 is pushed toward the base end portion 2b with respect to the diameter-expanding member 3, each expansion portion 3t of the diameter-expanding member 3 is expanded radially outward by the diameter-expanding surface 4f. In the present embodiment, the tapered portion 4 is integrally formed with the tip portion 2a of the anchor bolt 2.

The high nut 5 has a female threaded portion 5n that meshes with the male threaded portion 2n of the anchor bolt 2. In the high nut 5, the male threaded portion 2n of the anchor bolt 2 is screwed into the female threaded portion 5n from one end 5a side on one side in the central axis C direction. The high nut 5 has a tool engaging portion 5k on the outer peripheral surface thereof to which a tool such as a socket (not shown) is engaged.

In the high nut 5, a plurality of through holes 5h are formed at predetermined positions in the central axis C direction at intervals in the circumferential direction. In the present embodiment, the through holes 5h are formed at two locations in the circumferential direction. Each through hole 5h communicates the inner peripheral surface and the outer peripheral surface of the high nut 5 in the radial direction.

Mounting bolts 20 for mounting various equipment, pipes, light ceilings, ducts, and other articles from the other end 5b on the other side (opposite to the anchor bolt 2) of the central axis C direction to the high nut 5 (FIG. 5. See FIG. 6) is screwed in.

A flat washer (first intermediate member) 10 and a convex washer (second intermediate member) 11 are arranged on one side of the high nut 5 in the C direction of the central axis.
The flat washer 10 is disk-shaped and has an outer diameter larger than that of the rubber member 6. The flat washer 10 has an insertion hole 10h in which the anchor bolt 2 is inserted in the central portion.

As shown in FIG. 2, the convex washer 11 integrally includes a contact portion 11b and a pedestal portion 11a having an outer diameter larger than that of the rubber member 6. The convex washer 11 is provided so that the contact portion 11b is arranged on the high nut 5 side on the other side in the central axis C direction, and the pedestal portion 11a is separated from the flat washer 10 on one side in the central axis C direction. Since the outer diameter of the contact portion 11b is smaller than the outer diameter of the rubber member 6, the contact portion 11b can contact the rubber member 6.

The rubber member 6 is provided on one side of the high nut 5 in the C direction of the central axis. The rubber member 6 is made of a rubber-based material. The rubber member 6 has a disk shape and has an insertion hole (not shown) in which the anchor bolt 2 is inserted in the central portion. The rubber member 6 is sandwiched between the contact portion 11b of the pedestal portion 11a and the flat washer 10.

The rubber member 6 is compressed in the central axis C direction when the distance between the flat washer 10 and the pedestal portion 11a in the central axis C direction is narrowed by tightening the high nut 5. The rubber member 6 is deformed so as to expand in diameter outward from the high nut 5 and the flat washer 10 in a state of being compressed in the central axis C direction.

The indicator member 7 is arranged inside the high nut 5. The indicator member 7 is inserted into the high nut 5 from the other end 5b side on the other side in the central axis C direction. The indicator member 7 integrally has a disk-shaped base portion 7a and a plurality of arm portions 7b extending from the base portion 7a toward one side (anchor bolt 2 side) in the central axis C direction. Each arm portion 7b integrally has an arm portion main body 7c extending from the base portion 7a and a large diameter portion 7d provided at the tip end portion of the arm portion main body 7c. The large diameter portion 7d has a substantially spherical diameter larger than the outer diameter of the arm portion main body 7c.
Such an indicator member 7 is formed of, for example, a resin-based material. The indicator member 7 is arranged at a position where the large diameter portion 7d faces the through hole 5h from the inside in the radial direction.

The indicator member 7 has a large diameter portion 7d in a state where the mounting bolt 20 (see FIG. 5) screwed into the high nut 5 from the other side (opposite side to the anchor bolt 2) in the central axis C direction does not abut on the base portion 7a. Does not protrude radially outward from the through hole 5h of the high nut 5.

In the indicator member 7, the mounting bolt 20 (see FIG. 6) screwed into the high nut 5 from the other side in the central axis C direction (opposite to the anchor bolt 2) abuts on the base 7a, and one of the indicator members 7 is in the central axis C direction. When pressed to the side (anchor bolt 2 side), the plurality of arm portions 7b are deformed so as to spread outward in the radial direction, and protrude outward from each of the plurality of through holes 5h in the radial direction.

Next, the construction method of the anchor 1 of the present embodiment will be described.
FIG. 3 is a view showing a method of constructing an anchor according to an embodiment, and is a cross-sectional view showing a state in which the anchor is inserted into a prepared hole formed in a concrete skeleton.
FIG. 4 is a view showing a method of constructing an anchor according to an embodiment, and is a cross-sectional view showing a state in which a high nut is tightened to expand a diameter-expanding member and the anchor is fixed in a prepared hole.
FIG. 5 is a view showing a method of constructing an anchor according to an embodiment, and is a cross-sectional view showing a state in which a mounting bolt is screwed into a high nut to expand the diameter of the rubber ring outward in the radial direction.
FIG. 6 is a view showing a method of constructing an anchor according to an embodiment, and is a cross-sectional view showing a state in which a mounting bolt is screwed in and an indicator member is projected radially outward from a through hole of a nut.

As shown in FIG. 3, in order to construct the anchor 1, first, a pilot hole 101 is formed in the concrete skeleton 100 (for example, the ceiling) of the building or structure to which the anchor 1 is installed. The prepared hole 101 is formed with a diameter and a depth preset according to the anchor 1.

When installing in the prepared hole 101, the anchor 1 is prepared by screwing the base end portion 2b of the anchor bolt 2 provided with the diameter-expanding member 3 into the high nut 5 to a predetermined depth. The dimension of the tip portion 2a side of the anchor bolt 2 inserted in 101 can be made constant.

Next, the tip portion 2a side of the anchor bolt 2 of the anchor 1 is inserted into the prepared hole 101 formed in the concrete skeleton 100. The anchor 1 is inserted into the prepared hole 101 until the pedestal portion 11a of the convex washer 11 comes into contact with the concrete skeleton 100.
In the present embodiment, in the anchor 1, the outer diameter of the convex portion 3a provided on the outer peripheral surface of the diameter-expanding member 3 is slightly larger than the inner diameter of the prepared hole 101. Therefore, for example, the anchor 1 is driven into the prepared hole 101 by using a striking tool such as a metal hammer. As a result, the anchor 1 is inserted into the prepared hole 101 in a state where the convex portion 3a of the diameter-expanding member 3 is in contact with the inner peripheral surface of the prepared hole 101.

Subsequently, a tool such as a socket is engaged with the other end 5b side of the high nut 5. Since the high nut 5 of the present embodiment is not formed with a breaking groove or the like, the depth (length) of the tool socket in the central axis C direction is not particularly limited.

Next, the installer rotates the tool and tightens the high nut 5. As shown in FIG. 4, as the high nut 5 is tightened, the anchor bolt 2 meshed with the high nut 5 is displaced in the direction of being pulled up from the prepared hole 101. Then, the diameter-expanding surface 4f of the tapered portion 4 provided at the tip portion 2a of the anchor bolt 2 expands the expansion portion 3t of the diameter-expanding member 3 radially outward. At this time, the diameter-expanding member 3 is restricted from rotating with respect to the prepared hole 101 by the convex portion 3a coming into contact with the inner peripheral surface of the prepared hole 101, and the position of the prepared hole 101 with respect to the depth direction is restricted. Therefore, the expansion portion 3t of the diameter-expanding member 3 is surely fixed in the prepared hole 101.

When the expansion portion 3t is fixed to the prepared hole 101, the torque required to rotate the high nut 5 increases. As a result, a force that resists the displacement of the anchor bolt 2 in the direction of pulling up from the prepared hole 101 acts. Along with this, the high nut 5 is displaced in the direction approaching the concrete skeleton 100. Then, as the flat washer 10 approaches the contact portion 11b of the convex washer 11, the distance between the pedestal portion 11a of the convex washer 11 and the flat washer 10 in the central axis C direction is narrowed. As a result, the rubber member 6 sandwiched between the abutting portion 11b and the flat washer 10 is crushed in the central axis C direction and elastically deformed so as to expand outward in the radial direction.

In this state, the rubber member 6 crushed in the central axis C direction between the pedestal portion 11a and the flat washer 10 is expanded radially outward from the flat washer 10. As a result, the builder himself or his manager or the like visually inspects whether or not the rubber member 6 protrudes (exposed) radially outward from the flat washer 10 of the anchor 1, and the diameter-expanded member. It can be confirmed that the expansion portion 3t of 3 is expanded and the anchor 1 is firmly fixed in the prepared hole 101.

After the anchor 1 is installed on the concrete skeleton 100 in this way, as shown in FIG. 5, the mounting bolts 20 for attaching various devices, pipes, light ceilings, ducts, and other articles are screwed into the high nut 5. .. When the mounting bolt 20 is screwed into the high nut 5, it abuts against the base portion 7a of the indicator member 7 and presses the indicator member 7 to one side in the central axis C direction. Then, as shown in FIG. 6, the plurality of arm portions 7b are deformed so as to spread outward in the radial direction.

When the mounting bolt 20 is screwed into the high nut 5 to a predetermined position, the large diameter portion 7d provided at the tip of each arm portion 7b of the indicator member 7 is radially from each of the plurality of through holes 5h. Protruding outward. For example, when the tip portion 7t of the large diameter portion 7d protrudes radially outward from the outer peripheral surface of the high nut 5 from the through hole 5h, the fitting length of the mounting bolt 20 and the high nut 5 in the central axis C direction. Is ensured to a minimum. Further, the entire large diameter portion 7d protrudes from the through hole 5h, and the arm portion main body 7c protrudes radially outward of the high nut 5, so that the fitting length of the mounting bolt 20 and the high nut 5 in the central axis C direction. It is possible to secure more enough.
Therefore, the installer and the manager can visually confirm whether or not the fitting length of the mounting bolt 20 and the high nut 5 in the central axis C direction is equal to or larger than a predetermined dimension.

Hereinafter, the effect obtained by the anchor 1 of the present embodiment will be described.
According to the anchor 1 of the present embodiment, a rubber member that expands in diameter outward from the high nut 5 in a state of being compressed in the central axis C direction on the tip portion 2a side of the anchor bolt 2 with respect to the high nut 5. It is equipped with 6. As a result, by visually recognizing the state in which the rubber member 6 is expanded radially outward from the flat washer 10, it is determined whether or not the anchor 1 is securely fixed in the prepared hole 101 formed in the concrete skeleton 100. Can be visually confirmed by a person or an administrator.
Further, in the anchor 1 of the present embodiment, since it is not necessary to form a breaking groove or the like in the high nut 5, the size of the tool used to rotate the high nut 5 is not limited, and the high nut 5 is discarded during construction. Nothing will happen.

Further, according to the anchor 1 of the present embodiment, when the mounting bolt 20 is screwed into the high nut 5 to a predetermined position, the arm portion 7b of the indicator member 7 is connected to the high nut 5 from each of the plurality of through holes 5h. It protrudes to the outside of. Therefore, according to the anchor 1 of the present embodiment, after the mounting bolt 20 is screwed in, the fitting state of the mounting bolt 20 is determined based on the protruding state of the indicator member 7, that is, whether or not the arm portion 7b is protruding. Alternatively, the administrator can visually confirm it.
Further, according to the anchor 1 of the present embodiment, since a plurality of through holes 5h and arm portions 7b are provided, visibility from a distant place is improved, and it is easier for the builder or manager to visually confirm the construction. Can be.
In this way, by using the anchor 1 of the present embodiment, the installer or the operator can manage the installation of the anchor 1, the confirmation of the installation state, and the installation state of the mounting bolts without the need for a special tool for construction. The person can do it visually.

According to the anchor 1 of the present embodiment, a flat washer 10 having an outer diameter larger than that of the rubber member 6 is provided between the high nut 5 and the rubber member 6, and the rubber member 6 is compressed in the central axis C direction. In this state, the diameter is expanded radially outward from the flat washer 10. As a result, when the anchor 1 is installed in the prepared hole 101 of the concrete skeleton 100, the rubber member 6 is not exposed to the radial outside of the flat washer 10 in the state before the high nut 5 is tightened. In a state where the expansion portion 3t of the diameter expansion member 3 is expanded in diameter by tightening the high nut 5 and fixed in the prepared hole 101, the rubber member 6 is compressed and protrudes outward in the radial direction of the flat washer 10. This makes it possible to visually confirm the rubber member 6. In this way, the builder or the manager can surely confirm the construction state of the anchor 1 in the prepared hole 101 based on whether or not the rubber member 6 can be visually confirmed.

According to the anchor 1 of the present embodiment, the convex washer 11 further includes a contact portion 11b, a pedestal portion 11a having an outer diameter larger than that of the rubber member 6, and a convex washer 11. As a result, by sandwiching the rubber member 6 between the pedestal portion 11a and the abutting portion 11b of the flat washer 10, the rubber member 6 can be reliably compressed and projected outward in the radial direction of the flat washer 10.
Further, since the rubber member 6 is sandwiched between the contact portion 11b and the flat washer 10, the gap between the pedestal portion 11a of the convex washer 11 and the flat washer 10 is increased by the thickness of the contact portion 11b. Therefore, the visibility of the rubber member 6 protruding into the gap between the pedestal portion 11a and the flat washer 10 is improved.

According to the anchor 1 of the present embodiment, the rubber member 6 is made of a rubber-based material. Therefore, when the high nut 5 is tightened and the rubber member 6 is compressed in the direction of the central axis C, the rubber member 6 is pushed outward in the radial direction over the entire circumferential direction and is expanded more than the flat washer 10, so that the rubber member 6 is separated. The visibility from the place is high, and it becomes easy for the installer or the manager to visually confirm the construction.

According to the anchor 1 of the present embodiment, in the indicator member 7, the arm portion 7b is arranged radially inward with respect to the through hole 5h in a state where the base portion 7a is not pressed by the mounting bolt 20. That is, in this state, the arm portion 7b does not protrude radially outward of the high nut 5 from the through hole 5h. When the mounting bolt 20 is screwed into the high nut 5, the base portion 7a is pressed against the mounting bolt 20, the arm portion 7b is displaced radially outward, and the arm portion 7b protrudes radially outward from the through hole 5h. Therefore, the screwed state of the mounting bolt 20 with respect to the high nut 5 can be visually confirmed by the installer or the manager from the protruding state of the arm portion 7b. Further, since a plurality of through holes 5h and arm portions 7b are provided, visibility from a distant place is improved, and the installer or the manager visually confirms the screwed state of the mounting bolt 20 into the high nut 5. Becomes easier.

According to the anchor 1 of the present embodiment, the arm portion 7b is provided at the tip portion of the arm portion main body 7c extending from the base portion 7a and the tip portion of the arm portion main body 7c, and has a larger diameter portion 7d than the arm portion main body 7c. , Are integrated. Therefore, the installer or the manager visually confirms the screwed state of the mounting bolt 20 with respect to the high nut 5 by confirming whether the large diameter portion 7d projects radially outward of the high nut 5 through the through hole 5h. be able to.

According to the anchor 1 of the present embodiment, the large diameter portion 7d protrudes radially outward from the outer peripheral surface of the high nut 5 in a state where the mounting bolt 20 and the high nut 5 have a predetermined fitting length or more. do. Therefore, the installer or the manager can visually grasp the screwed state of the mounting bolt 20 with respect to the high nut 5 by confirming whether the large diameter portion 7d protrudes radially outward of the high nut 5.

Although one embodiment of the present invention has been described above, each configuration and combinations thereof in the embodiment are examples, and addition, omission, substitution, and other configurations are added, omitted, substituted, and the like within the range not deviating from the gist of the present invention. It can be changed. Further, the present invention is not limited to the embodiments.

(Modification example)
For example, in the anchor 1 of the above embodiment, the case where the convex portion 3a is provided as the rotation stop or the position constraint in the diameter expansion member 3 is given as an example, but the method of the rotation stop and the position constraint in the diameter expansion member 3 is limited to this. Not done.

FIG. 7 is a diagram showing the appearance of the anchor of the modified example. The same reference numerals are given to the configurations common to the above embodiments, and the details thereof will be omitted.
As shown in FIG. 7, the anchor 1A of this modification mainly includes an anchor bolt 2, a diameter-expanding member 30, a tapered portion 4, a high nut 5, a rubber member 6, and an indicator member 7. ..
The diameter-expanding member 30 of this modification has a return portion 31 instead of the convex portion 3a of the diameter-expanding member 3 shown in FIG. The return portion 31 is a member for stopping the rotation of the diameter-expanding member 3 in the prepared hole and restricting the position of the prepared hole in the depth direction. A plurality of return portions 31 may be provided in the circumferential direction of the diameter-expanding member 3.

The return portion 31 is a band-shaped member extending along the central axis C direction. In the present embodiment, the return portion 31 is formed by cutting out a part of the outer peripheral surface 30a of the cylindrical diameter-expanding member 30. In the return portion 31, one side of the central axis C (the tip end portion 2a side of the anchor bolt 2) is connected to the diameter expansion member 30, and the other side of the central axis C (the base end portion 2b side of the anchor bolt 2) is connected. It can be deformed radially outward. That is, the tip of the return portion 31 can be deformed in the radial direction starting from the connection portion (base portion) with the diameter-expanding member 30. The return portion 31 is deformed so as to be convex outward in the radial direction in a state where the anchor 1 is not inserted into the prepared hole. Specifically, in the anchor 1A of the present modification, the outer diameter of the diameter-expanding member 30 is larger than the inner diameter of the prepared hole 101 by the amount of the return portion 31 provided on the outer peripheral surface 30a.

Therefore, in the anchor 1A of the present modification, when the tip portion 2a side of the anchor bolt 2 is inserted into the prepared hole 101 formed in the concrete skeleton 100, the return portion 31 comes into contact with the inner peripheral surface of the prepared hole 101. When the anchor 1A is inserted into the prepared hole 101, the return portion 31 can be displaced inward in the radial direction unlike the convex portion 3a. Therefore, the return portion 31 is unlikely to generate a resistance force when the anchor 1A is inserted into the prepared hole 101. Therefore, according to the anchor 1A of this modification, it can be relatively easily inserted into the prepared hole 101 with a plastic hammer without using a striking tool such as a metal hammer.

After being inserted into the prepared hole 101, the return portion 31 of the anchor 1A is in contact with the inner peripheral surface of the prepared hole 101. Therefore, when the installer expands the expansion portion 3t of the diameter expansion member 30 radially outward by tightening the high nut 5, the return portion 31 of the diameter expansion member 30 comes into contact with the inner peripheral surface of the prepared hole 101. As a result, the rotation with respect to the prepared hole 101 is restricted, and the position of the prepared hole 101 with respect to the depth direction is restricted. Therefore, the expansion portion 3t of the diameter-expanding member 30 is surely fixed in the prepared hole 101.

As described above, according to the anchor 1A of the present modification, since the diameter-expanding member 30 having the return portion 31 is provided, the insertion work into the prepared hole 101 with a plastic hammer can be easily performed without using a striking tool such as a metal hammer. Can be done. Further, since the return portion 31 can restrict the rotation and the position of the diameter-expanding member 30, the anchor 1A can be reliably fixed to the prepared hole 101.

Further, the use of the anchor 1 shown in the above-described embodiment is not particularly limited. Further, in the above embodiment, the wedge type anchor is taken as an example as the anchor 1, but the method of the anchor is not limited to this. The present invention also relates to a so-called cone nut type tightening type anchor in which the expansion portion is deformed by pulling the cone portion into the diameter-expanding member by tightening the high nut integrated with the anchor bolt, for example. Applicable. When applied to a cone nut type tightening type anchor, the above-mentioned convex portion 3a and return portion 31 are not required.

1 ... Anchor, 2 ... Anchor bolt, 2a ... Tip part (first end part), 2b ... Base end part (second end part), 2n ... Male screw part, 3 ... Diameter expansion member, 3t ... Expansion part, 4 ... Tapered part, 4f ... Expanded diameter surface, 5 ... High nut (nut member), 5h ... Through hole, 5n ... Female threaded part, 6 ... Rubber member (first deforming member), 7 ... Indicator member (second deforming member) ), 7a ... base, 7b ... arm, 7c ... arm body, 7d ... large diameter, 10 ... flat washer (first intermediate member), 11 ... convex washer (second intermediate member), 11a ... pedestal, 11b ... Contact part, 20 ... Mounting bolt, 31 ... Return part, 100 ... Concrete skeleton, 101 ... Pilot hole, C ... Central axis.

Claims (8)

Anchor bolts and
A diameter-expanding member mounted on the first end portion in the central axis direction of the anchor bolt and having an expansion portion that can be deformed radially outward.
A tapered portion provided at the first end portion of the anchor bolt and having a diameter-expanded surface for expanding the expanded portion, and a tapered portion.
A nut member provided at the second end of the anchor bolt in the central axial direction and having a plurality of through holes in the circumferential direction.
A first deforming member provided on the first end side of the anchor bolt with respect to the nut member and expanding in diameter outward in the radial direction while being compressed in the central axial direction.
A second arm portion that is inserted inside the nut member and has a plurality of arm portions that protrude outward from each of the plurality of through holes when the mounting bolt is screwed into the nut member to a predetermined position. (Ii) with a deformable member,
Metal expansion anchor. The second deformable member includes a base to which the tip of the mounting bolt abuts and a base.
It integrally has the arm portion extending from the base portion to a position facing from the inside in the radial direction with respect to the plurality of through holes.
The metal expansion anchor according to claim 1. The arm portion
It integrally has an arm portion main body extending from the base portion and a large diameter portion provided at the tip end portion of the arm portion main body and having a diameter larger than that of the arm portion main body.
The metal expansion anchor according to claim 2. The large diameter portion protrudes radially outward from the nut member in a state where the mounting bolt and the nut member have a predetermined fitting length or more.
The metal expansion anchor according to claim 3. A first intermediate member having an outer diameter larger than that of the first deformable member is provided between the nut member and the first deformable member.
The first deforming member expands in diameter outward from the first intermediate member in a state of being compressed in the central axial direction.
The metal expansion anchor according to any one of claims 1 to 4. A second intermediate member provided on the opposite side of the first deformable member from the first intermediate member is further provided.
The second intermediate member is
A contact portion provided on the radial inside of the first deformable member and in contact with the first deformable member, and the first one end portion side of the anchor bolt with respect to the first deformable member. It has a pedestal portion having an outer diameter larger than that of a deformable member.
The metal expansion anchor according to claim 5. The first deformable member is made of a rubber-based material.
The metal expansion anchor according to any one of claims 1 to 6. The diameter-expanding member has a barb extending along the central axis direction.
In the return portion, the first end portion side in the central axial direction is connected to the diameter expanding member, and the second end portion side in the central axial direction is deformable in the radial direction.
The metal expansion anchor according to any one of claims 1 to 7.

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