TW202004036A - Metal expansion anchor - Google Patents

Abstract

A metal expansion anchor comprises: an anchor bolt, a diameter-expanding member attached to the first end portion of the anchor shaft in the central axis direction and having an expansion portion that is deformable outward in the radial direction, a tapered portion provided at the first end of the anchor and having an enlarged diameter surface for expanding the expansion portion, a nut member provided at a second end portion of the bolt in the central axis direction and having a plurality of through holes in the circumferential direction, a first deforming member that is disposed on the first end side with respect to the anchor end of the nut member and that expands in the outward radial direction in a state of being compressed in the central axis direction, and a second deforming member that is inserted into the inner side of the nut member and has a plurality of arm portions that protrude from the plurality of through holes toward the outer side of the nut member when the mounting bolt is screwed into the predetermined position of the nut member.

Description

Metal expansion anchor

The invention relates to a metal expansion anchor.

Metal expansion anchors are used when concrete blocks constituting buildings or structures are equipped with various machines, pipelines, light steel frames, pipes, and other items. Metal expansion anchors are inserted and fixed in holes formed in the concrete block. The metal expansion anchor has a shaft-shaped (rod-shaped) anchor, an expansion member provided at one end of the anchor, and a tall nut provided at the other end of the anchor. When the metal expansion anchor is inserted into the hole together with one end portion of the anchor and the high nut is tightened, the expansion member expands outward. Thereby, the expansion member bites into the inner circumferential surface of the hole, and the metal expansion anchor is fixed to the concrete block. At the other end side of the high nut of such a metal expansion anchor, a shaft-shaped installation bolt is screwed in, and various machines, pipelines, light steel frames, conduits, etc. are installed through the installation bolt.

If such a metal expansion anchor is insufficiently fixed to the hole formed in the concrete block, there is a risk of shaking due to the load of the article and the anchor itself falling off from the hole. In addition, if the screw-in of the high-nut mounting bolts of the metal expansion anchor is insufficient, there may be shaking of the mounting bolts due to the load of the article and the mounting bolts themselves from the high-nut mounting bolts themselves The risk of falling off. Therefore, it is necessary to securely fix the metal expansion anchor of the hole of the concrete block at the time of construction of the metal expansion anchor, and at the same time securely install the high nut of the bolt at the time of installation of various items Screw in.

However, the construction quality of metal expansion anchors may vary depending on the proficiency of the builder. In addition, although the installation of the bolts is generally performed by a builder other than the anchor builder, depending on the situation on the site, the anchors that have been constructed may be difficult to see, and they are expected to be easily visible. Here, during or after the construction, it is necessary for the builder or manager to visually confirm whether the installation of the metal expansion anchor and the installation of the bolts have been reliably performed.

The following Patent Document 1 describes a metal expansion anchor formed by forming an annular fracture groove on the outer peripheral surface of a high nut. In this configuration, when a tool such as a socket wrench is fitted to the high nut and the nut is rotated, once a torque above a predetermined value acts on the high nut, a part of the high nut will break at the fracture groove fracture. Tighten the anchor bolt until the high nut breaks at the fracture groove, thereby confirming that the expansion member is fully expanded in the hole and the metal expansion anchor is securely fixed.

In addition, Patent Document 1 also describes a configuration having a through hole penetrating the inner and outer peripheral surfaces of the high nut and a deforming member that protrudes from the through hole when the mounting bolt is screwed into the high nut. According to such a configuration, when the high nut of the metal expansion anchor fixed to the hole of the concrete block is screwed in, the deformation bolt passes through the through hole and passes from the outer periphery of the nut The surface is prominent. With this, it is confirmed whether the installation bolt is sufficiently tightened by the presence or absence of the deformed piece. [Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2012-177290

[Problems to be solved by the invention] As with the metal expansion anchors described above, in order to rotate the high nut with the fracture groove formed, a tool such as a socket wrench must be fitted only on the removal side (the side away from the concrete block) when the fracture groove breaks. Once the tool grips the fracture groove and crosses both the pull-out side of the fracture groove and the residual on the concrete side, there will be no moment to break the fracture groove. Therefore, during the construction of the metal expansion anchor as described above, the depth of the sleeve is limited. Furthermore, after the construction, a part of the high nut broken at the fractured groove will become waste, and there is a problem that it takes time to dispose of it.

In addition, the through-hole is only provided at one place in the circumferential direction. In order to confirm the presence or absence of the protrusion of the bolt-attached deformer accompanying the high nut of the metal expansion anchor, it is necessary to confirm the direction near the through-hole . Therefore, for example, when the anchor bolt is installed on the ceiling, the builder or the manager will be away from the place for confirmation, and the anchor bolt has poor visibility, making it difficult to confirm the construction by visual inspection.

In view of the above circumstances, one of the objects of the present invention is to provide a bolt that can be installed without special tools during construction, as well as visually confirm the installation status and visually confirm the installation status of the installation bolts Metal expansion bolt. [Technical means to solve problems]

An aspect of the metal expansion bolt of the present invention includes: an anchor; a diameter-expanding member, which is mounted on a first end of the anchor in the direction of a central axis, and has an expansion that can be deformed outward in the radial direction A tapered portion, which is provided at the first end of the anchor and has a diameter-enlarging surface that expands the expansion portion; a nut member is provided at a first direction of the central axis of the bolt Two end portions with a plurality of through holes in the circumferential direction; a first deforming member is provided on the first end side of the anchor relative to the nut member, and is compressed toward the central axis The diameter expands outward in the radial direction; and a second deforming member is inserted into the inner side of the nut member and has a plurality of arm portions, the plurality of arm portions are screwed into the nut in a mounting bolt When the member reaches a predetermined position, each of the through holes protrudes outward from the nut member.

In the above-mentioned appearance, the second deformation member integrally has a base and the arm, the base is for the front end of the mounting bolt to contact, and the arm is from the base to the plurality of penetrations It is preferable that the position facing the inside in the radial direction of the hole is extended.

In the above aspect, the arm portion integrally has an arm body and a large-diameter portion, the arm portion system extends from the base portion, and the large-diameter portion is provided at a front end portion of the arm body and relatively The arm body has a larger diameter.

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

In the above aspect, a first intermediate member is provided between the nut member and the first deforming member, the first intermediate member has a larger outer diameter than the first deforming member, and the first deforming member In the state of being compressed in the direction of the central axis, it is better to expand the diameter outward in the radial direction than the first intermediate member.

Among the above-mentioned appearances, there is a second intermediate member, the second intermediate member is disposed on the opposite side of the first deformation member from the first intermediate member, the second intermediate member has a contact portion and a A pedestal portion, the abutting portion is provided on the radially inner side of the first deforming member and abuts on the first deforming member, the pedestal portion is provided on the first end of the anchor relative to the first deforming member It is better to have a larger outer diameter than the first deforming member on the part side.

Among the above-mentioned appearances, it is preferable that the first deformation member is made of a rubber-based material.

In the above-mentioned appearance, the diameter-expanding member has a barb portion extending along the direction of the central axis, and the barb portion is in contact with the diameter-expanding member at the first end side in the direction of the central axis At the same time, it is preferable to deform the second end portion side in the center axis direction in the radial direction. [Comparing the efficacy of the previous technology]

According to one aspect of the present invention, it is possible to provide a metal expansion bolt that requires no special tools at the time of construction so that a builder or a manager can perform anchor bolt installation and visually confirm the installation status and installation bolt installation status.

FIG. 1 is a diagram showing the appearance of an anchor bolt 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 mainly includes an anchor bolt 2, a diameter-enlarging member 3, a tapered portion 4, a high nut 5 (nut member), and a rubber member 6 (first deformation Member) and indicator member 7 (second deformation member) (refer to FIG. 2). The anchor 1 of the present embodiment is a so-called bolt-type metal expansion anchor of the so-called tightening method in which the diameter-expanding member 3 is expanded by tightening the high nut 5.

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

The enlarged diameter member 3 is attached to the small diameter portion 2d of the front end portion 2a of the anchor 2. The entire diameter-expanding member 3 is cylindrical. The diameter-expanding member 3 is formed with slits 3s extending in the direction of the central axis C in at least two places spaced around the central axis C in the circumferential direction. The enlarged diameter member 3 has an expansion portion 3t between the slits 3s adjacent in the circumferential direction. The entire diameter-enlarging member 3 including the expansion portion 3t has an outer diameter almost the same as the intermediate portion 2c of the anchor 2. The expansion portion 3t can be pushed radially outward by receiving the tapered portion 4 described later, so that the distal end portion 2a side of the anchor 2 can be deformed radially outward. Furthermore, the diameter expansion member 3 has the convex part 3a provided in the outer peripheral surface. The outer diameter of the convex portion 3a is only slightly larger than the inner diameter of a prefabricated hole for anchor construction described later. The convex portion 3a prevents rotation of the diameter-enlarging member 3 in the preformed hole for anchor construction described later, and restricts the position of the preformed hole in the depth direction.

The tapered portion 4 is provided at the front end portion 2a on the side of the central axis C direction of the anchor 2. The tapered 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 direction of the central axis C toward the front end portion 2a side on one side. The tapered portion 4 is inserted into the enlarged diameter member 3 from the front 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 toward 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 this embodiment, the tapered portion 4 is integrally formed on the front end portion 2a of the anchor 2.

The high nut 5 has a female threaded portion 5n that meshes with the male threaded portion 2n of the anchor bolt 2. The male screw portion 2n of the anchor 2 is screwed into the female screw portion 5n from the one end 5a side of the high nut 5 in the direction of the central axis C. The outer peripheral surface of the high nut 5 has a tool fitting portion 5k for fitting a tool such as a socket wrench (not shown).

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 with intervals in the circumferential direction. In this embodiment, the through holes 5h are formed at two places in the circumferential direction. Each through hole 5h connects the inner peripheral surface and the outer peripheral surface of the high nut 5 in the radial direction.

At the high nut 5, from the other end 5b on the other side of the central axis C direction (opposite to the anchor 2), screw in items for installing various machines, pipelines, light steel frames, conduits, etc. Install bolt 20 (refer to Figure 5 and Figure 6).

The high nut 5 is provided with a flat washer 10 (first intermediate member) and a convex washer 11 (second intermediate member) on one side in the direction of the central axis C. 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 in the central portion.

As shown in FIG. 2, the convex washer 11 integrally has an abutment portion 11 b and a pedestal portion 11 a 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 other side of the high nut 5 in the direction of the central axis C, and the pedestal portion 11a is spaced from the flat washer 10 toward the side in the direction of the central axis C. 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 with respect to the central axis C direction of the high nut 5. The rubber member 6 is composed of a rubber-based material. The rubber member 6 is disc-shaped, and has an insertion hole (not shown) through which the anchor 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.

Once the rubber member 6 tightens the high nut 5 to narrow the interval between the flat washer 10 and the center axis C direction of the pedestal portion 11 a, it is compressed in the center axis C direction. The rubber member 6 is deformed so as to expand outward in the radial direction than the high nut 5 and the flat washer 10 in a state of being compressed in the direction of the central axis C.

The indicator member 7 is arranged inside the high nut 5. The indicator member 7 is inserted into the other end 5b side of the tall nut 5 from the other side of the central axis C direction. The indicator member 7 integrally has a disk-shaped base 7a and a plurality of arms 7b extending from the base 7a to one side (anchor 2 side) in the direction of the central axis C. Each arm portion 7b integrally includes an arm body 7c extending from the base portion 7a, and a large-diameter portion 7d provided at the front end portion of the arm body 7c. The large diameter portion 7d has a slightly spherical shape with a larger diameter than the outer diameter of the arm body 7c. Such an indicator member 7 is composed of, for example, a resin material. The indicator member 7 is arranged at a position facing the large-diameter portion 7d from the radially inner side with respect to the through-hole 5h.

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

When the mounting bolt 20 (refer to FIG. 6) screwed into the high nut 5 from the other side (the side opposite to the anchor 2) in the direction of the central axis C abuts against the base portion 7a and toward the direction of the central axis C Pushing on one side (anchor 2 side), the plurality of arm portions 7b of the indicator member 7 are deformed so as to expand radially outward, and protrude radially outward of the high nut 5 from the plurality of through holes 5h.

Next, the construction method of the anchor 1 of this embodiment will be described. FIG. 3 is a diagram showing a method of constructing an anchor bolt according to an embodiment, and is a cross-sectional view showing a state where the anchor bolt is inserted into a prefabricated hole formed in a concrete block. FIG. 4 is a diagram showing a method of constructing an anchor bolt according to an embodiment, and is a cross-sectional view showing a state in which a high nut is tightened to expand an expansion member to fix the anchor bolt in a prefabricated hole. FIG. 5 is a view showing a method of constructing an anchor bolt according to an embodiment, and is a cross-sectional view showing a state where a high nut is tightened and a rubber member is extended and expanded radially outward. FIG. 6 is a view showing a method of constructing an anchor bolt according to an embodiment, and is a cross-sectional view showing a state in which an indicator member is screwed into an installation bolt to protrude radially outward from a through hole of a high nut.

As shown in FIG. 3, to carry out the construction of the anchor 1, first, a prefabricated hole 101 is formed in the concrete block 100 (eg, ceiling) of the building or structure to be installed with the anchor 1. The prefabricated hole 101 is formed with a predetermined diameter and depth according to the anchor 1.

In addition, when it is installed in the prefabricated hole 101, the anchor 1 can be inserted into the prefabricated hole 101 by screwing the base end portion 2b of the anchor 2 provided with the enlarged diameter member 3 into the high nut 5 to a predetermined depth The size of the front end portion 2a side of the anchor 2 is fixed.

Next, the front end portion 2a side of the anchor bolt 2 of the anchor 1 is inserted into the prefabricated hole 101 formed in the concrete block 100. The anchor 1 is inserted into the prefabricated hole 101 until the pedestal portion 11 a of the convex washer 11 contacts the concrete block 100. In the present embodiment, the outer diameter of the convex portion 3 a of the anchor 1 provided on the outer circumferential surface of the enlarged diameter member 3 is slightly larger than the inner diameter of the preformed hole 101. Therefore, the anchor 1 is driven into the prefabricated hole 101 by using a hammering tool such as a metal mallet. With this, the anchor 1 is inserted into the prefabricated hole 101 in a state where the convex portion 3a of the diameter-enlarging member 3 abuts the inner circumferential surface of the prefabricated hole 101.

Then, a tool such as a socket wrench is fitted to the other end 5b side of the high nut 5. Since the high nut 5 of this embodiment does not form a break groove or the like, the depth (length) of the tool sleeve in the direction of the central axis C is not particularly limited.

Next, the builder rotates the tool and tightens the high nut 5. As shown in FIG. 4, as the high nut 5 is tightened, the anchor 2 engaged with the high nut 5 will be displaced upward from the prefabricated hole 101. Then, the expanded diameter surface 4f of the tapered portion 4 provided at the tip portion 2a of the anchor 2 expands the expanded portion 3t of the expanded diameter member 3 radially outward. At this time, the diameter-expanding member 3 abuts on the inner peripheral surface of the preformed hole 101 by the convex portion 3 a to restrict the rotation relative to the preformed hole 101 and restrict the position in the depth direction relative to the preformed hole 101. As a result, the expansion portion 3t of the diameter-enlarging member 3 is securely fixed to the preformed hole 101.

Once the expansion portion 3t is fixed to the prefabricated hole 101, the torque necessary to rotate the high nut 5 increases. Thereby, the resistance to the displacement of the anchor bolt 2 from the direction in which the prefabricated hole 101 is pulled upward acts. Along with this, the high nut 5 is displaced toward the concrete block 100. Then, the flat washer 10 approaches the abutment portion 11b of the convex washer 11 so that the interval in the direction of the central axis C of the flat washer 10 and the base portion 11a of the convex washer 11 becomes narrow. As a result, the rubber member 6 sandwiched between the contact portion 11b and the flat washer 10 is flattened in the direction of the central axis C and elastically deforms so as to expand radially outward.

In this state, the rubber member 6 that is crushed in the direction of the central axis C between the pedestal portion 11 a and the flat washer 10 is pushed and expanded radially outward than the flat washer 10. By this, the builder himself, his manager, or the like, can visually check whether the rubber member 6 protrudes radially outward (exposed) from the flat washer 10 of the anchor 1 to confirm that the expansion portion 3t of the diameter expansion member 3 expands. The anchor 1 is securely fixed to the prefabricated hole 101.

After the anchor 1 is installed on the concrete block 100 in this way, as shown in FIG. 5, the mounting bolt 20 for mounting various machines, pipelines, light steel frames, pipes, and other items is screwed into the high nut 5. When the mounting bolt 20 is screwed into the high nut 5, the base 7a of the indicator member 7 is abutted, and the indicator member 7 is pushed toward one side in the direction of the central axis C. Then, as shown in FIG. 6, the plural arm portions 7b are deformed so as to expand outward in the radial direction.

When the mounting bolt 20 is screwed into the high nut 5 up to a predetermined position, the large diameter portion 7d provided at the front end of each arm portion 7b of the indicator member 7 protrudes radially outward from the plurality of through holes 5h. For example, when the front end portion 7t of the large-diameter portion 7d protrudes outward in the radial direction from the outer peripheral surface of the high nut 5 from the through hole 5h, the bolt 20 and the high nut 5 in the direction of the central axis C The fitting length is guaranteed to a minimum. Furthermore, the entire large-diameter portion 7d protrudes from the through hole 5h, and the arm body 7c protrudes outward in the radial direction of the high nut 5, whereby the fitting of the bolt 20 and the high nut 5 in the direction of the central axis C The combined length can be fully ensured. Therefore, whether the fitting length of the installation bolt 20 and the high nut 5 in the direction of the central axis C is greater than a predetermined size can be confirmed visually by the builder himself and the manager.

Hereinafter, the effect obtained by the anchor 1 of the present embodiment will be described. According to the anchor 1 of the present embodiment, the front end portion 2a side of the anchor 2 of the high nut 5 has a rubber member that expands radially outward of the high nut 5 in the compressed state in the central axis C direction. 6. In this way, by checking the state where the rubber member 6 is extended radially outward than the flat washer 10, the builder or manager can visually confirm whether the anchor 1 is securely fixed to the prefabricated hole 101 formed in the concrete block 100 . In addition, in the anchor 1 of this embodiment, there is no need to form a break groove or the like in the high nut 5, so the size of the tool for rotating the high nut 5 is not limited, nor will it be used during construction Generate waste.

Furthermore, according to the anchor 1 of the present embodiment, when the mounting bolt 20 is screwed into the high nut 5 up to a predetermined position, the arm portion 7b of the indicating member 7 goes from the plurality of through holes 5h to the high nut 5 respectively. Outer protruding. Therefore, according to the anchor 1 of the present embodiment, after the installation bolt 20 is screwed in, based on the protruding state of the indicating member 7, that is, whether the arm portion 7b protrudes, the builder or manager can visually confirm the installation bolt 20 Of the fitted state. Furthermore, according to the anchor 1 of the present embodiment, since it has a plurality of through holes 5h and arm portions 7b, the visibility from a distant place is improved, and the visual construction confirmation by the builder or manager can become more easy. In this way, by using the anchor 1 of this embodiment, the anchor 1 can be installed without special tools during construction, and the builder or manager can visually confirm the installation state and install the bolts. status.

According to the anchor 1 of this embodiment, a flat washer 10 having a larger outer diameter than the rubber member 6 is provided between the high nut 5 and the rubber member 6, and the rubber member 6 is flatter than the compressed state in the direction of the central axis C The washer 10 further expands in diameter in the radial direction. Thereby, when the anchor 1 is installed in the prefabricated hole 101 of the concrete block 100, the rubber member 6 is not exposed radially outward 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-expanding member 3 is expanded and fixed to the preformed hole 101 by tightening the high nut 5, the rubber member 6 is compressed to protrude outward in the radial direction of the flat washer 10. With this, the rubber member 6 can be confirmed by visual inspection. In this way, the builder or the manager can confirm the construction state of the anchor 1 in the prefabricated hole 101 based on whether the rubber member 6 can be confirmed by visual inspection.

The anchor 1 according to the present embodiment further includes a convex washer 11 having an abutting portion 11b and a pedestal portion 11a, which has a larger outer diameter than the rubber member 6. As a result, the rubber member 6 is sandwiched between the pedestal portion 11 a and the contact portion 11 b of the flat washer 10, whereby the rubber member 6 can be reliably compressed to protrude outward in the radial direction of the flat washer 10. Furthermore, since the rubber member 6 is sandwiched between the contact portion 11b and the flat washer 10, the gap between the seat portion 11a of the convex washer 11 and the flat washer 10 is only the thickness of the contact portion 11b. Therefore, the visibility of the rubber member 6 protruding from the gap between the pedestal portion 11a and the flat washer 10 is improved.

According to the anchor 1 of this embodiment, the rubber member 6 is composed of a rubber-based material. Therefore, when the high nut 5 is tightened to compress the rubber member 6 in the direction of the central axis C, the rubber member 6 is extended and expanded radially outward over the entire circumferential direction, expanding to be larger than the flat washer 10, The visibility from a place far away is high, and it is easy to confirm the construction by the builder or manager by visual inspection.

According to the anchor 1 of the present embodiment, the indicator member 7 is provided in the radial direction inside with respect to the through hole 5h without pushing the base portion 7a by the mounting bolt 20 and pressing the base portion 7a. 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 7a is pushed by the mounting bolt 20, the arm portion 7b is displaced radially outward, and protrudes radially outward from the through hole 5h. Therefore, the state in which the bolt 20 is screwed into the high nut 5 can be visually confirmed by the builder or manager according to the protruding state of the arm portion 7b. In addition, since a plurality of through holes 5h and arm portions 7b are provided, the visibility from a far away place is improved, and the counter nut 5 of the installation bolt 20 is visually installed by a builder or a manager The confirmation of the screw-in state becomes easy.

According to the anchor 1 of the present embodiment, the arm portion 7b integrally includes the arm body 7c extending from the base portion 7a and the large-diameter portion 7d provided at the front end of the arm body 7c and having a larger diameter than the arm body 7c. Therefore, by confirming whether the large-diameter portion 7d protrudes outward in the radial direction of the high nut 5 through the through hole 5h, the builder or the manager can visually confirm the screw-in of the mounting bolt 20 of the high nut 5 status.

According to the anchor 1 of the present embodiment, in a state where the mounting bolt 20 and the high nut 5 have a predetermined fitting length or longer, the large-diameter portion 7d protrudes radially outward from the outer circumferential surface of the high nut 5. Therefore, by confirming whether the large-diameter portion 7d protrudes outward in the radial direction of the high nut 5, the builder or manager can visually grasp the screwing state of the mounting bolt 20 in the high nut 5.

An embodiment of the present invention has been described above, but each configuration and combination thereof in the embodiment is an example, and additions, omissions, substitutions, and other changes of configurations can be made without departing from the gist of the present invention. Furthermore, the present invention is not limited by the examples.

(Modification) For example, although the anchor 1 of the above-described embodiment is exemplified in the case where the enlarged diameter member 3 is provided with the convex portion 3a as rotation prevention or position restraint, the rotation prevention or position restraint method in the enlarged diameter member 3 It is not limited to this.

FIG. 7 is a diagram showing the appearance of an anchor in a modification. In addition, the configuration common to the above-mentioned embodiment is denoted by the same reference numerals, and the detailed description thereof is 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 barb portion 31 instead of the convex portion 3a of the diameter-expanding member 3 shown in FIG. 1. The barb portion 31 is a member for preventing rotation of the enlarged diameter member 3 in the preformed hole and restricting the position of the preformed hole in the depth direction. In addition, a plurality of barb portions 31 may be provided in the circumferential direction of the enlarged diameter member 3.

The barb portion 31 is a belt-shaped member extending in the direction of the central axis C. In this modification, the barb portion 31 is formed by notching a part of the outer peripheral surface 30 a of the cylindrical diameter-expanding member 30. The barbed portion 31 is in contact with the enlarged diameter member 30 on one side of the central axis C (the front end portion 2a side of the anchor 2), and the other side of the central axis C (the side of the base end portion 2b side of the anchor 2) can Radial deformation outside. That is, the barb portion 31 can deform from the tip end in the radial direction with the portion (base portion) in contact with the enlarged diameter member 30 as a starting point. The barbed portion 31 is deformed so as to protrude radially outward without the anchor 1 being inserted into the preformed hole. Specifically, in the anchor 1A of this modification, the outer diameter of the enlarged diameter member 30 is larger than the inner diameter of the preformed hole 101 by a portion provided only on the barb portion 31 of the outer peripheral surface 30a.

Therefore, in the anchor 1A of this modification, when the front end portion 2a side of the anchor bolt 2 is inserted into the prefabricated hole 101 formed in the concrete block 100, the barb portion 31 contacts the inner peripheral surface of the prefabricated hole 101. When the anchor 1A is inserted into the prefabricated hole 101, the barbed portion 31 is different from the convex portion 3a and can be displaced radially inward. Therefore, the barbed portion 31 does not easily cause resistance when the anchor 1A is inserted into the prefabricated hole 101. Therefore, according to the anchor 1A of this modification, even without using a hammer such as a metal mallet, it can be inserted into the prefabricated hole 101 relatively easily with a plastic mallet.

After being inserted into the prefabricated hole 101, the barbed portion 31 of the anchor 1A comes into contact with the inner circumferential surface of the prefabricated hole 101. Therefore, when the builder tightens the high nut 5 to expand the expansion portion 3t of the diameter-expanding member 30 radially outward, the diameter-expanding member 30 abuts against the inner circumferential surface of the preformed hole 101 by the barb portion 31 While restricting the rotation with respect to the preformed hole 101, the position of the preformed hole 101 in the depth direction is restricted. As a result, the expanded portion 3t of the diameter-enlarging member 30 is securely fixed to the preformed hole 101.

As described above, according to the anchor 1A of the present modification, since the diameter-expanding member 30 having the barb portion 31 is provided, it is possible to easily advance to the preformed hole 101 by the plastic mallet without using a hammer such as a metal mallet Insert job. Furthermore, since the barb portion 31 can restrict the rotation and position of the enlarged diameter member 30, the anchor 1A can be reliably fixed to the prefabricated hole 101.

In addition, the use of the anchor 1 shown in the above embodiment is not particularly limited. In addition, although the wedge-shaped anchor bolt is exemplified in the above embodiment, the form of the anchor is not limited to this. The present invention can also be applied to, for example, a so-called conical nut-type tightening anchor in which an expansion portion is expanded by tightening a high nut integrated into an anchor to pull the conical portion into the diameter-expanding member bolt. In addition, when it is applied to a conical nut type tightening anchor, the above-mentioned convex portion 3a or barb portion 31 is not required.

1‧‧‧ anchor 1A‧‧‧Anchor 2‧‧‧Anchor 2a‧‧‧Front end (first end) 2b‧‧‧Base end (second end) 2c‧‧‧Middle 2d‧‧‧small diameter part 2n‧‧‧Male thread part 3‧‧‧Expansion member 3a‧‧‧Convex 3s‧‧‧slit 3t‧‧‧Expansion 30‧‧‧Expansion member 30a‧‧‧Perimeter 31‧‧‧Barb 4‧‧‧Cone 4f‧‧‧diameter expansion surface 5‧‧‧High nut (nut member) 5a‧‧‧one end 5b‧‧‧The other end 5h‧‧‧Through hole 5k‧‧‧Tool Fitting Department 5n‧‧‧Female thread part 6‧‧‧Rubber member (first deformation member) 7‧‧‧Indicating member (second deformation member) 7a‧‧‧Base 7b‧‧‧arm 7c‧‧‧ Arm body 7d‧‧‧Diameter Department 7t‧‧‧Front end 10‧‧‧flat washer (first intermediate member) 10h‧‧‧Plug through hole 11‧‧‧ convex washer (second intermediate member) 11a‧‧‧Pedestal Department 11b‧‧‧Abutment Department 20‧‧‧ Installation bolt 100‧‧‧Concrete block 101‧‧‧Prefabricated holes C‧‧‧Central axis

[Figure 1] Figure 1 is a diagram showing the appearance of an anchor according to an embodiment. [Figure 2] Figure 2 is a cross-sectional view of an anchor according to an embodiment. [FIG. 3] FIG. 3 is a diagram showing a method of constructing an anchor bolt according to an embodiment, and is a cross-sectional view showing a state where the anchor bolt is inserted into a prefabricated hole formed in a concrete block. [FIG. 4] FIG. 4 is a diagram showing a method of constructing an anchor bolt according to an embodiment, and is a cross-sectional view showing a state in which a high nut is tightened to expand an expansion member and fix the anchor bolt in a prefabricated hole. [FIG. 5] FIG. 5 is a diagram showing a method of constructing an anchor bolt according to an embodiment, and is a cross-sectional view showing a state in which a high nut is tightened to extend and expand a rubber member radially outward. [Figure 6] Figure 6 is a diagram showing a method of construction of an anchor bolt according to an embodiment, and is a cross section showing a state where an installation member is screwed in and an indicator member protrudes radially outward from a through hole of a high nut Figure. [Figure 7] Figure 7 is a diagram showing the appearance of an anchor in a modification.

1‧‧‧ anchor

2‧‧‧Anchor

2b‧‧‧Base end (second end)

2n‧‧‧Male thread part

3‧‧‧Expansion member

3a‧‧‧Convex

3s‧‧‧slit

3t‧‧‧Expansion

4‧‧‧Cone

4f‧‧‧diameter expansion surface

5a‧‧‧one end

5b‧‧‧The other end

5h‧‧‧Through hole

5n‧‧‧Female thread part

6‧‧‧Rubber member (first deformation member)

7‧‧‧Indicating member (second deforming member)

7a‧‧‧Base

7b‧‧‧arm

7c‧‧‧ Arm body

7d‧‧‧Diameter Department

7t‧‧‧Front end

10‧‧‧flat washer (first intermediate member)

10h‧‧‧Plug through hole

11‧‧‧ convex washer (second intermediate member)

11a‧‧‧Pedestal Department

11b‧‧‧Abutment Department

20‧‧‧ Installation bolt

100‧‧‧Concrete block

101‧‧‧Prefabricated holes

C‧‧‧Central axis

Claims (8)

A metal expansion anchor, including: An anchor A diameter-expanding member is attached to a first end of the anchor in the direction of the central axis, and has an expansion portion that can be deformed radially outward; A tapered portion is provided at the first end of the anchor, and has a diameter-expanding surface that expands the expansion portion; A nut member is provided at a second end of the bolt in the direction of the central axis, and has a plurality of through holes in the circumferential direction; A first deforming member, which is provided on the first end side of the anchor with respect to the nut member, and expands radially outward in the state of being compressed in the direction of the central axis; and A second deforming member is inserted into the inner side of the nut member, and has a plurality of arm parts, the plurality of arm parts are self-pluraling when the mounting bolt is screwed into the nut member to a predetermined position Each of the through holes protrudes to the outside of the nut member. The metal expansion anchor according to claim 1, wherein the second deformation member integrally has a base and the arm, the base is for the front end of the mounting bolt to contact, and the arm is directed from the base It extends from a position facing the inside of the plurality of through holes in the radial direction. The metal expansion anchor according to claim 2, wherein the arm portion integrally has an arm body and a large diameter portion, the arm portion system extends from the base portion, and the large diameter portion is provided on the arm portion A front end portion of the body has a larger diameter than the arm body. The metal expansion anchor according to claim 3, wherein the large-diameter portion protrudes radially outward from the nut member in a state where the installation bolt and the nut member have a predetermined fitting length or more. The metal expansion anchor according to any one of claims 1 to 4, wherein a first intermediate member is provided between the nut member and the first deforming member, and the first intermediate member has a first deformation The member has a larger outer diameter, and the first deforming member expands more radially outward than the first intermediate member in a state of being compressed toward the central axis. The metal expansion anchor according to claim 5, further comprising a second intermediate member disposed on the opposite side of the first deformation member from the first intermediate member, the second intermediate member It has an abutting portion and a pedestal portion, the abutting portion is disposed on the radially inner side of the first deforming member and abuts on the first deforming member, and the pedestal portion is disposed on the first deforming member relative to the first deforming member The first end side of the anchor has a larger outer diameter than the first deforming member. The metal expansion anchor according to any one of claims 1 to 6, wherein the first deformation member is composed of a rubber-based material. The metal expansion anchor according to any one of claims 1 to 7, wherein the diameter-expanding member has a barb portion extending in the direction of the central axis, the barb portion is secured in the direction of the central axis While the first end side is in contact with the diameter-expanding member, the second end side in the center axis direction is deformed in the radial direction.

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