JP2019203293A - Metal expansion anchor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal expansion anchor by which a builder or a manager can visually confirm the installation and installation state of an anchor and the installation state of a mounting bolt without requiring a special tool for construction. SOLUTION: An anchor bolt, a diameter expanding member that is attached to a first end portion of the anchor bolt in the central axis direction and has an expansion portion that is deformable radially outward, and an expansion portion that is provided at the first end portion. A taper portion having a diameter-expanding surface that expands, a nut member provided at the second end portion in the central axis direction of the anchor bolt and having a plurality of through holes in the circumferential direction, and a first portion of the anchor bolt with respect to the nut member. A first deformable member that is provided on one end side and expands radially outward while being compressed in the central axis direction, and is inserted inside the nut member, and the mounting bolt is screwed into the nut member to a predetermined position. And a second deformable member having a plurality of arm portions projecting to the outside of the nut member from each of the plurality of through holes when broken. [Selection diagram] Fig. 6

Description

  The present invention relates to a metal expansion anchor.

  When attaching various equipment, pipes, light roofs, ducts, and other items to the concrete frame constituting the building or structure, a metal expansion anchor is used. The metal expansion anchor is inserted and fixed in a hole formed in the concrete frame. 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. When the metal nut is fastened with a high nut in a state where one end of the anchor bolt is inserted into the hole together with the expansion member, the diameter expansion member expands radially outward. As a result, the expanded member bites into the inner peripheral surface of the hole, and the metal expansion anchor is fixed to the concrete frame. A shaft-like mounting bolt is screwed into the other end of the high nut of such a metal expansion anchor, and articles such as various devices, pipes, light roofs, and ducts are attached via the mounting bolt.

If such a metal expansion anchor is not sufficiently fixed to the hole formed in the concrete frame, there is a possibility that the anchor itself may come off from the hole due to wobbling due to the load of the article.
In addition, when 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. Therefore, when installing the metal expansion anchor, it is necessary to securely fix the metal expansion anchor in the hole of the concrete frame, and when mounting various articles, it is necessary to securely screw the mounting bolt into the high nut. .

  However, the construction quality of the metal expansion anchor may vary depending on the proficiency level of the installer. In addition, it is common for the installation bolts to be installed by a contractor other than the anchor contractor. However, depending on the situation at the site, the installed anchor may be difficult to see. desired. Therefore, it is necessary that the installer or the administrator can visually confirm whether or not the metal expansion anchor and the mounting bolt have been securely installed during and after the construction.

  Patent Document 1 listed below describes a metal expansion anchor having a configuration in which an annular fracture groove is formed on the outer peripheral surface of a high nut. In this configuration, when a tool such as a socket wrench is engaged with the high nut and the nut is rotated, when a torque of a predetermined value or more is applied to the high nut, a part of the high nut is broken at the breaking groove. By tightening the anchor bolt until the high nut breaks at the breaking groove, it is confirmed that the expanded member is sufficiently expanded in the hole and the metal expansion anchor is firmly fixed.

  Patent Document 1 also discloses a configuration including a through hole that penetrates the inner peripheral surface and the outer peripheral surface of a high nut, and a deformable material that protrudes from the through hole when a mounting bolt is screwed into the high nut. According to such a configuration, when the mounting bolt for mounting the article is screwed into the high nut of the metal expansion anchor fixed in the hole of the concrete frame, the deformable material protrudes from the outer peripheral surface of the nut through the through hole. Thereby, it is confirmed by the presence or absence of the protrusion of a deformation material whether the attachment bolt was fully fastened by the high nut.

JP 2012-177290 A

In the metal expansion anchor as described above, in order to rotate the high nut in which the breaking groove is formed, only the side to be removed when the breaking groove is broken (side away from the concrete frame) with respect to the breaking groove, It is necessary to engage a tool such as a socket. If the tool straddles both the side that is removed when the rupture groove breaks and the side that remains on the concrete body side across the rupture groove, torque that causes rupture in the rupture groove does not occur It is. Therefore, the depth of the socket is limited when the metal expansion anchor is constructed as described above.
In addition, after the construction, there is a problem that a part of the high nut broken at the breaking groove becomes waste, which takes time.

  In addition, the through hole is provided only at one place in the circumferential direction, and in order to confirm whether or not the deformed material protrudes when the mounting bolt is screwed into the high nut of the metal expansion anchor, check from the direction where 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 checks from a remote location, so 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 allows the installation of the anchor and the confirmation of the installation state to be visually confirmed without requiring a special tool for the construction, and the confirmation of the installation status of the mounting bolt visually. One object is to provide a metal expansion anchor that can be made.

  One aspect of the metal expansion anchor of the present invention includes an anchor bolt, a diameter-expanding member attached to a first end portion in the central axis direction of the anchor bolt, and having an expansion portion that can be deformed radially outward, A taper portion provided at the first end portion of the anchor bolt and having a diameter-expanding surface for expanding the expansion portion; a second end portion in the central axis direction of the anchor bolt; A nut member having a through-hole, and a first deformation member provided on the first end side of the anchor bolt with respect to the nut member and expanding radially outward in a state compressed in the central axis direction When inserted into the nut member and a mounting bolt is screwed into the nut member to a predetermined position, the nut member protrudes outward from each of the plurality of through holes. Comprising a second deformable member having a plurality of over arm portion.

  In the above aspect, the second deformable member integrally includes a base portion with which a tip of the mounting bolt abuts and the arm portion extending from the base portion to a position facing the plurality of through holes from the radially inner side. Is preferred.

  In the above aspect, the arm portion integrally includes an arm portion main body extending from the base portion and a large-diameter portion provided at a distal end portion of the arm portion main body and having a larger diameter than the arm portion main body. preferable.

  The said aspect WHEREIN: It is preferable that the said large diameter part protrudes in the radial direction outer side from the said nut member in the state in which the said attachment bolt and the said nut member became more than predetermined fitting length.

  In the above aspect, 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 extends in the central axis direction. It is preferable that the diameter of the first intermediate member is expanded more radially outward than the first intermediate member.

  In the above aspect, the first deformation member further includes a second intermediate member provided on the opposite side of the first intermediate member, and the second intermediate member is provided on a radially inner side of the first deformation member, A contact portion that contacts the first deformation member; and a pedestal portion that is provided on the first end side of the anchor bolt with respect to the first deformation member and has a larger outer diameter than the first deformation member; It is preferable to have.

  In the above aspect, the first deformation member is preferably made of a rubber-based material.

  In the above aspect, the diameter-expanding member has a return portion extending along the central axis direction, and the return portion is connected to the diameter-expanding member on the first end portion side in the central axis direction, The second end portion side in the central axis direction is preferably deformable in the radial direction.

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

FIG. 1 is a diagram illustrating an appearance of an anchor according to an embodiment. FIG. 2 is a cross-sectional view of an anchor according to an embodiment. FIG. 3 is a diagram illustrating an anchor construction method according to an embodiment, and is a cross-sectional view illustrating a state where the anchor is inserted into a prepared hole formed in a concrete frame. FIG. 4 is a diagram illustrating an anchor construction method according to an embodiment, and is a cross-sectional view illustrating a state in which a high nut is tightened to expand a diameter-expanding member and the anchor is fixed in a pilot hole. FIG. 5 is a diagram illustrating an anchor construction method according to an embodiment, and is a cross-sectional view illustrating a state in which a high nut is tightened and a rubber member is expanded radially outward. FIG. 6 is a diagram illustrating an anchor construction method according to an embodiment, and is a cross-sectional view illustrating a state in which a mounting bolt is screwed and an indicator member is protruded radially outward from a through hole of a high nut. FIG. 7 is a view showing the appearance of a modified anchor.

FIG. 1 is a diagram illustrating an appearance of an anchor according to an embodiment. FIG. 2 is a cross-sectional view of an anchor according to an embodiment.
As shown in FIGS. 1 and 2, the anchor 1 of this 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 deformation member). ) 6 and an indicator member (second deformation member) 7 (see FIG. 2). The anchor 1 of this embodiment is a so-called tightening wedge-type metal expansion anchor that expands the diameter-expanding member 3 by tightening a 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 2 d having an outer diameter smaller than that of the intermediate portion 2 c of the anchor bolt 2 is formed at the tip end portion (first end portion) 2 a on one side in 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 is cylindrical as a whole. In the diameter-expanding member 3, slits 3s extending in the direction of the central axis C are formed in at least two places spaced in the circumferential direction around the central axis C. The diameter-expanding member 3 includes an expansion portion 3t between the slits 3s adjacent to each other in the circumferential direction. The expanded member 3 as a whole including the expanded portion 3t has substantially the same outer diameter as the intermediate portion 2c of the anchor bolt 2. The extended portion 3t is deformed radially outward by the distal end portion 2a side of the anchor bolt 2 by being pressed radially outward by a tapered portion 4 described later. Moreover, the diameter-expanding member 3 has the convex part 3a provided in the outer peripheral surface. The outer diameter of the convex part 3a is slightly larger than the inner diameter of the pilot hole for constructing the anchor described later. The convex portion 3a restricts the rotation of the diameter-expanding member 3 in the pilot hole in which an anchor described later is to be constructed, and the position of the pilot hole in the depth direction.

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

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

  In the high nut 5, a plurality of through holes 5 h are formed at predetermined positions in the direction of the central axis C 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.

  A mounting bolt 20 for attaching various devices, pipes, light roofs, ducts, and other articles to the high nut 5 from the other end 5b on the other side in the central axis C direction (the side opposite to the anchor bolt 2). 5, see FIG. 6).

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 central axis C direction.
The flat washer 10 is disc-shaped and has a larger outer diameter than the rubber member 6. The flat washer 10 has an insertion hole 10h through which the anchor bolt 2 is inserted at the center.

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

  The rubber member 6 is provided on one side of the high nut 5 in the central axis C direction. The rubber member 6 is made of a rubber material. The rubber member 6 has a disk shape, and has an insertion hole (not shown) through which the anchor bolt 2 is inserted at the center. 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 direction of the central axis C when the interval between the flat washer 10 and the pedestal portion 11a in the direction of the central axis C is reduced by tightening the high nut 5. The rubber member 6 is deformed so as to expand its diameter outward in the radial direction with respect to the high nut 5 and the flat washer 10 in a state compressed in the central axis C direction.

The indicator member 7 is disposed 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 includes a disk-shaped base portion 7a and a plurality of arm portions 7b extending from the base portion 7a toward one side in the central axis C direction (anchor bolt 2 side). Each arm portion 7b integrally includes an arm portion main body 7c extending from the base portion 7a and a large-diameter portion 7d provided at the distal end portion of the arm portion main body 7c. The large diameter portion 7d has a substantially spherical shape having a larger diameter than the outer diameter of the arm portion main body 7c.
Such indicator member 7 is formed of, for example, a resin material. The indicator member 7 is disposed 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 when the mounting bolt 20 (see FIG. 5) screwed into the high nut 5 from the other side in the central axis C direction (the side opposite to the anchor bolt 2) does not hit the base portion 7a. Does not protrude radially outward from the through hole 5h of the high nut 5.

  The indicator member 7 has a mounting bolt 20 (see FIG. 6) screwed into the high nut 5 from the other side in the central axis C direction (the side opposite to the anchor bolt 2) abuts the base 7a, 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 project outward from the plurality of through holes 5h in the radial direction of the high nut 5.

Next, the construction method of the anchor 1 of this embodiment is demonstrated.
FIG. 3 is a diagram illustrating an anchor construction method according to an embodiment, and is a cross-sectional view illustrating a state where the anchor is inserted into a prepared hole formed in a concrete frame.
FIG. 4 is a diagram illustrating an anchor construction method according to an embodiment, and is a cross-sectional view illustrating a state in which a high nut is tightened to expand a diameter-expanding member and the anchor is fixed in a pilot hole.
FIG. 5 is a diagram illustrating an anchor construction method according to an embodiment, and is a cross-sectional view illustrating a state in which a mounting bolt is screwed into a high nut and a rubber ring is expanded radially outward.
FIG. 6 is a diagram illustrating an anchor construction method according to an embodiment, and is a cross-sectional view illustrating a state in which a mounting bolt is screwed and an indicator member is protruded 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 a concrete frame 100 (for example, a ceiling) of a building or a structure to which the anchor 1 is to be installed. The pilot hole 101 is formed with a diameter and depth set in advance according to the anchor 1.

  When the anchor 1 is installed in the lower hole 101, the anchor 1 is screwed into the high nut 5 with a base end 2 b of the anchor bolt 2 provided with the diameter-expanding member 3 to a predetermined depth. The dimensions of the anchor bolt 2 inserted into the end 101a side of the anchor bolt 2 can be made constant.

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

  Subsequently, a tool such as a socket is engaged with the other end 5 b side of the high nut 5. Since the high nut 5 of this embodiment is not formed with a breaking groove or the like, there is no particular limitation on the depth (length) of the tool socket in the direction of the central axis C.

  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 lower hole 101. Then, the diameter-enlarged surface 4f of the tapered portion 4 provided at the distal end portion 2a of the anchor bolt 2 expands the expanded portion 3t of the diameter-expanded member 3 radially outward. At this time, the diameter expanding member 3 is restricted from rotating with respect to the lower hole 101 by the convex portion 3 a coming into contact with the inner peripheral surface of the lower hole 101, and the position of the lower hole 101 in the depth direction is restricted. Therefore, the expanded portion 3t of the diameter expanding member 3 is securely fixed to the prepared hole 101.

  When the extended portion 3t is fixed in the lower hole 101, the torque required to rotate the high nut 5 increases. As a result, a force that resists displacement of the anchor bolt 2 in the direction in which the anchor bolt 2 is pulled up from the lower hole 101 acts. Accordingly, the high nut 5 is displaced in a direction approaching the concrete frame 100. Then, when the flat washer 10 approaches the contact portion 11b of the convex washer 11, the interval between the base portion 11a of the convex washer 11 and the flat washer 10 in the direction of the central axis C is narrowed. As a result, the rubber member 6 sandwiched between the contact portion 11b and the flat washer 10 is crushed in the direction of the central axis C and elastically deformed so as to expand radially outward.

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

  After the anchor 1 is installed on the concrete housing 100 in this way, as shown in FIG. 5, a mounting bolt 20 for mounting various devices, pipes, light roofs, ducts and other articles is screwed into the high nut 5. . When the mounting bolt 20 is screwed into the high nut 5, it strikes against the base portion 7 a 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 radial from each of the plurality of through holes 5h. Projects outward. For example, when the distal end 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 in the central axis C direction between the mounting bolt 20 and the high nut 5 The minimum is secured. Further, the entire large-diameter portion 7d protrudes from the through hole 5h, and the arm portion main body 7c protrudes outward in the radial direction 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 is increased. It is possible to secure a sufficient thickness.
Therefore, it is possible for the builder and the manager to visually confirm whether or not the fitting length of the mounting bolt 20 and the high nut 5 in the direction of the central axis C is equal to or greater than a predetermined dimension.

Hereinafter, effects 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 radially outward from the high nut 5 in a state of being compressed in the direction of the central axis C toward the tip end 2a side of the anchor bolt 2 with respect to the high nut 5. 6 is provided. Thus, it is confirmed whether or not the anchor 1 is firmly fixed in the prepared hole 101 formed in the concrete frame 100 by visually observing the state in which the rubber member 6 is expanded outward in the radial direction from the plain washer 10. An administrator or an administrator can confirm it visually.
Moreover, in the anchor 1 of this embodiment, since it is not necessary to form a fracture | rupture groove | channel etc. in the high nut 5, there is no restriction | limiting in the size of the tool used for rotating the high nut 5, and it discards in 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. Protrude outwards. Therefore, according to the anchor 1 of the present embodiment, after the mounting bolt 20 is screwed, the fitting state of the mounting bolt 20 is determined based on whether the indicator member 7 protrudes, that is, whether the arm portion 7b protrudes. Or the administrator can confirm visually.
Moreover, according to the anchor 1 of this embodiment, since the plurality of through-holes 5h and arm portions 7b are provided, the visibility from a distant place is improved, and it is easier to confirm the construction visually by the installer or manager. Can be.
In this way, by using the anchor 1 of the present embodiment, the installation of the anchor 1 and the confirmation of the installation state and the mounting state of the mounting bolts can be performed by the builder or management without requiring a special tool for construction. The person can do it visually.

  According to the anchor 1 of the present embodiment, the 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 direction of the central axis C. In this state, the diameter of the flat washer 10 is increased radially outward. Thus, when the anchor 1 is installed in the lower hole 101 of the concrete housing 100, the rubber member 6 is not exposed to the outside in the radial direction of the flat washer 10 before the high nut 5 is tightened. In a state where the expanded portion 3t of the diameter-expanding member 3 is expanded and fixed in the lower hole 101 by tightening the high nut 5, the rubber member 6 is compressed and protrudes radially outward of the flat washer 10. Thereby, the rubber member 6 can be confirmed visually. In this way, the installer or 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 having the contact portion 11b and the pedestal portion 11a having an outer diameter larger than that of the rubber member 6 is further provided. Thus, the rubber member 6 is sandwiched between the pedestal portion 11 a and the abutting portion 11 b of the flat washer 10, so that the rubber member 6 can be reliably compressed and protruded radially outward 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 base 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 in the gap between the base 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. The visibility from a place is high, and the construction confirmation by the visual observation by the installer or the manager becomes easy.

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

  According to the anchor 1 of the present embodiment, the arm portion 7b includes an arm portion main body 7c extending from the base portion 7a, and a large-diameter portion 7d that is provided at the distal end portion of the arm portion main body 7c and has a larger diameter than the arm portion main body 7c. Are integrally provided. 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 protrudes outward in the radial direction 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 are equal to or longer than a predetermined fitting length. To 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 combination thereof in the embodiment is an example, and addition, omission, replacement, and other configurations of the configuration are within the scope not departing from the gist of the present invention. It can be changed. Further, the present invention is not limited by the embodiment.

(Modification)
For example, in the anchor 1 of the above embodiment, the case where the convex portion 3a is provided as a rotation stop or position constraint in the diameter-expanding member 3 is taken as an example. Not.

FIG. 7 is a view showing the appearance of a modified anchor. In addition, the same code | symbol is attached | subjected about the same structure as the said embodiment, and description is abbreviate | omitted about the detail.
As shown in FIG. 7, the anchor 1 </ b> A 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 part 31 is a member for preventing the rotation of the diameter-expanding member 3 in the lower hole and regulating the position of the lower 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 belt-like member that extends along the direction of the central axis C. In the present embodiment, the return portion 31 is formed by cutting out a part of the outer peripheral surface 30 a of the cylindrical diameter-expanding member 30. The return portion 31 has one side (the tip 2a side of the anchor bolt 2) on the center axis C connected to the diameter-expanding member 30 and the other side (the base end 2b side of the anchor bolt 2) on the center axis C. 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 protrude 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 this modification, the outer diameter of the diameter expanding member 30 is larger than the inner diameter of the lower hole 101 by the amount of the return portion 31 provided on the outer peripheral surface 30a.

  Therefore, in the anchor 1 </ b> A of this modification, when the tip end 2 a side of the anchor bolt 2 is inserted into the lower hole 101 formed in the concrete housing 100, the return portion 31 comes into contact with the inner peripheral surface of the lower hole 101. When the anchor 1A is inserted into the pilot hole 101, the return portion 31 can be displaced radially inward, 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 modified example, the plastic hammer can be inserted into the pilot hole 101 relatively easily without using a hammering tool such as a metal hammer.

  After being inserted into the lower hole 101, the return portion 31 of the anchor 1 </ b> A comes into contact with the inner peripheral surface of the lower hole 101. Therefore, when the contractor expands the expansion portion 3t of the diameter expansion member 30 radially outward by tightening the high nut 5, the diameter expansion member 30 has the return portion 31 abutting against the inner peripheral surface of the lower hole 101. Thus, the rotation with respect to the lower hole 101 is restricted, and the position of the lower hole 101 in the depth direction is restricted. Therefore, the expanded portion 3t of the diameter expanding member 30 is securely fixed to 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, it is easy to insert into the pilot hole 101 with a plastic hammer without using a hammering tool such as a metal hammer. Can be done. Moreover, since the rotation restriction and the position restriction of the diameter-expanding member 30 can be performed by the return portion 31, the anchor 1A can be reliably fixed to the lower hole 101.

  Moreover, the application of the anchor 1 shown in the embodiment described above is not particularly limited. Moreover, in the said embodiment, although the wedge type anchor was mentioned as an example as the anchor 1, the system of an anchor is not limited to this. The present invention is also applicable to a so-called cone nut type tightening anchor that deforms an expanded portion by pulling the cone portion into the diameter-expanding member by tightening a high nut integrated with the anchor bolt, for example. Applicable. In addition, when applying to a corn nut type | formula clamp | tightening type anchor, the convex part 3a and the return part 31 which were mentioned above become unnecessary.

  DESCRIPTION OF SYMBOLS 1 ... Anchor, 2 ... Anchor bolt, 2a ... Tip part (1st end part), 2b ... Base end part (2nd end part), 2n ... Male thread part, 3 ... Diameter expansion member, 3t ... Expansion part, 4 ... Tapered part, 4f ... expanded surface, 5 ... high nut (nut member), 5h ... through hole, 5n ... female screw part, 6 ... rubber member (first deforming member), 7 ... indicator member (second deforming member) ), 7a ... base, 7b ... arm part, 7c ... arm part body, 7d ... large diameter part, 10 ... flat washer (first intermediate member), 11 ... convex washer (second intermediate member), 11a ... pedestal part, 11b ... contact part, 20 ... mounting bolt, 31 ... return part, 100 ... concrete frame, 101 ... pilot hole, C ... central axis.

Claims (8)

Anchor bolts,
A diameter-expanding member attached to a 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 on the first end of the anchor bolt and having a diameter-enlarging surface for expanding the expansion portion;
A nut member provided at the second end portion in the central axis direction of the anchor bolt and having a plurality of through holes in the circumferential direction;
A first deformation member that is provided on the first end side of the anchor bolt with respect to the nut member and expands radially outward in a state compressed in the central axis direction;
A plurality of arm portions that are inserted inside the nut member and have a plurality of arm portions projecting outward from the nut member from each of the plurality of through holes when a mounting bolt is screwed into the nut member to a predetermined position. Two deformable members,
Metal expansion anchor. The second deformable member has a base portion against which a tip of the mounting bolt abuts,
The arm portion extending from the base portion to a position facing the plurality of through-holes from the radially inner side, and integrally.
The metal expansion anchor according to claim 1. The arm portion is
An arm part main body extending from the base part, and a large-diameter part provided at a distal end of the arm part main body and having a larger diameter than the arm part main body;
The metal expansion anchor according to claim 2. In a state where the mounting bolt and the nut member are equal to or longer than a predetermined fitting length, the large diameter portion protrudes radially outward from the nut member.
The metal expansion anchor according to claim 3. A first intermediate member having an outer diameter larger than that of the first deformation member is provided between the nut member and the first deformation member,
The first deformable member expands radially outward from the first intermediate member in a state compressed in the central axis direction.
The metal expansion anchor as described in any one of Claims 1 thru | or 4. A second intermediate member provided on the opposite side of the first intermediate member to the first intermediate member;
The second intermediate member is
An abutting portion provided on a radially inner side of the first deforming member and abutting against the first deforming member; provided on the first end portion side of the anchor bolt with respect to the first deforming member; A pedestal portion having an outer diameter larger than that of the one deformable member,
The metal expansion anchor according to claim 5. The first deformation member is made of a rubber-based material.
The metal expansion anchor according to claim 1. The diameter-expanding member has a return portion extending along the central axis direction,
The return portion has the first end portion side in the central axis direction connected to the diameter-expanding member, and the second end portion side in the central axis direction is deformable in the radial direction.
The metal expansion anchor according to claim 1.

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