JP7246119B2 - Post-installed anchor and its installation structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a post-installed anchor that is drilled and driven into existing concrete and an installation structure thereof.

Main body anchors and sleeve anchors are used as post-installed anchors that are drilled and placed in existing concrete. As shown in FIGS. 9(a) and 9(b), the main body drive-in type anchor 200 includes a substantially cylindrical main body 201 having an expansion piece 202 on the distal end side and an internal thread 203 formed on the rear end side, and the main body 201. The expansion piece 202 is expanded by the tip cone 204 and driven into the hole 211 formed in the concrete 210 . A mounting bolt 205 is screwed into the female thread 203 of the driven-in main body anchor 200, an attachment 220 is externally inserted to the portion of the mounting bolt 205 protruding from the concrete 210, and a nut 207 is tightened via a washer 206, for example. An attachment 220 is attached by screwing into the attachment bolt 205 .

Once the mounting bolt 205 is removed, the main body driving type anchor 200 has no protruding portion from the concrete 210, so it is excellent in convenience as a temporary anchor. Furthermore, when it is desired to remove the main body 201 itself of the main body driving anchor 200, it is possible to pull out and remove the main body 201 while taking reaction force with the tip cone 204 as in Patent Documents 1 and 2.

As shown in FIGS. 9(c) and 9(d), the sleeve driving anchor 300 includes a sleeve 301 having an expansion piece 302 formed on the distal end side, a tapered portion 304 on the distal end side, and a male screw on the rear end side. The taper bolt 303 is formed with a portion 305 , and the expansion piece 302 is expanded by the taper portion 304 and driven into a hole 311 formed in the concrete 310 . A fitting 320 is externally inserted into the portion of the taper bolt 303 of the placed sleeve driving anchor 300 protruding from the concrete 310, and a nut 308 is screwed into the male threaded portion 305 via a washer 306 and a spring washer 307, for example. , the attachment 320 is attached.

Japanese Patent Application Laid-Open No. 2003-106323 JP 2015-71216 A

By the way, in the main body driving type anchor, the approximately cylindrical main body to which the mounting bolt is screwed and the tip cone are separate members. A force acts in the pull-out direction. Therefore, it is possible to remove the main body by pulling it out at the time of removal.

On the other hand, in a sleeve driving anchor, the tapered portion of the taper bolt is pulled into the sleeve and the expansion piece expands. This results in an increase in fixing power. However, with sleeve-driven anchors, when it is no longer necessary to drive anchors into concrete or install attachments, even if nuts, washers, and attachments are removed, the taper bolts remain in the concrete and protrude from the concrete. It can also become a hindrance. When attempting to remove a sleeve-driven anchor that has been driven in, it is necessary to pull it out with a load greater than the pull-out strength of the sleeve-driven anchor, so there is a high possibility that the concrete will be destroyed. Therefore, there is a demand for post-installed anchors that can prevent slipping out of concrete and can be easily removed when unnecessary.

SUMMARY OF THE INVENTION The present invention is proposed in view of the above problems, and provides a post-installed anchor that has a high anchoring force, is capable of preventing slipping out of concrete, and can be easily removed when unnecessary, and an installation structure thereof. intended to

The post-installed anchor of the present invention includes an inner member provided with a tapered portion that gradually expands in diameter toward the distal end on the distal end side of the base, and an expansion piece that expands by entering the tapered portion on the distal end side. It is characterized by comprising a sleeve having a female thread formed on an end side thereof, the inner member being provided with a female threaded hole opening at the rear end face, and a mounting bolt being screwed into the female threaded hole.
According to this, by screwing the mounting bolt into the female threaded hole of the inner member, when a load is applied to the mounting bolt, the tapered portion is pulled in by the expansion piece to generate expansion force, and the fixing force can be increased. . Therefore, it is possible to provide a highly reliable post-installed anchor that can prevent the tip cone of a main body driving anchor from slipping out, exhibits a high anchoring force, and prevents the tip cone from slipping out of the concrete. In addition, when the post-installed anchor is no longer required, the sleeve can be pulled out using the internal thread of the sleeve, and can be easily removed when unnecessary. Therefore, it is also possible to reuse the drill holes formed in the concrete for the installation of post-installed anchors.

The post-installed anchor of the present invention is characterized in that an engaging portion capable of engaging a pushing rod for pushing the inner member deep into the hole is provided on the distal end side of the female threaded hole of the inner member. In addition, the post-installed anchor of the present invention is provided with an inner member provided with a tapered portion that gradually expands in diameter toward the distal end on the distal end side of the base portion, and an expansion piece that expands by entering the tapered portion on the distal end side. , a sleeve having a female screw formed to the rear end thereof to be screwed into the male screw of the removal attachment, and the inner member is provided with a female screw hole opening at the rear end surface, and a mounting bolt is inserted into the female screw hole. An engagement hole capable of engaging with an engagement protrusion on a tip end surface of a push rod for pushing the inner member into the hole is provided on the tip side of the female threaded hole of the inner member. It is characterized by being formed in a shape corresponding to the projection. In addition, the post-installed anchor of the present invention is provided with an inner member provided with a tapered portion that gradually expands in diameter toward the distal end on the distal end side of the base portion, and an expansion piece that expands by entering the tapered portion on the distal end side. , a sleeve having a female screw formed to the rear end thereof to be screwed into the male screw of the removal attachment, and the inner member is provided with a female screw hole opening at the rear end surface, and a mounting bolt is inserted into the female screw hole. The female threaded hole is provided as an engaging portion that can be screwed and can be engaged by screwing a male threaded portion of a pushing rod that pushes the inner member into the hole on the distal end side of the female threaded hole of the inner member. It is characterized in that a small-diameter female screw hole having a smaller diameter is formed.
According to this, by engaging the push bar with the engaging portion and pushing the inner member into the inner part of the hole, it is possible to remove the inner member from entering the expansion piece of the sleeve or to loosen the pressing state, which makes it easier and more reliable. The sleeve can be pulled out immediately.

The post-installed anchor installation structure of the present invention is a structure for installing the post-installed anchor according to the present invention, wherein the expansion piece is expanded by entering the tapered portion of the inner member so that the post-installed anchor perforates concrete. and the expansion piece is expanded by tightening a mounting nut against a mounting bolt screwed into the female threaded hole of the inner member. Further, the structure for installing a post-installed anchor of the present invention is a structure for installing a post-installed anchor according to the present invention, wherein the expansion piece is expanded by entering the tapered portion of the inner member so that the post-installed anchor is made of concrete. A space is formed in the hole so that the inner member can be pushed deep into the hole by tightening the mounting nut against the mounting bolt screwed into the female threaded hole of the inner member. , wherein the expansion piece is expanded accordingly.
According to this, the inner member is drawn by tightening the mounting bolt with the mounting nut, and the tapered portion of the inner member is drawn in by the expansion piece and expanded accordingly, so that a higher fixing force can be obtained even in a normal installation state. can greatly increase the rigidity of the entire anchor. In addition, it is possible to further increase resistance when a load is applied to the mounting bolt and the mounting bolt is pulled.

The post-installed anchor installation method of the present invention is a method of installing the post-installed anchor of the present invention, wherein the post-installed anchor is inserted into a hole in concrete, and the sleeve is driven to form the tapered portion on the expansion piece. a first step of inserting and expanding the expansion piece; a second step of screwing a mounting bolt into the female threaded hole of the inner member; It is characterized by comprising a third step of following and expanding the expansion piece by pulling it toward the mouth of the hole. Further, a method for constructing a post-installed anchor of the present invention is a method of constructing a post-installed anchor of the present invention, wherein the post-installed anchor is inserted into a hole in concrete, and the sleeve is driven to expand the tapered portion. a second step of screwing a mounting bolt into the female threaded hole of the inner member; and a mounting nut tightening the mounting bolt to tighten the inner member. A third step is provided for following and expanding the expansion piece by pulling it toward the opening side of the drilling so that a space is formed in the drilling so that the inner member can be pushed toward the inner side of the hole.
According to this, the tapered portion of the inner member is pushed into the expansion piece by driving the sleeve to expand the expansion piece, and the inner member is pulled toward the opening of the hole by tightening the mounting bolt with the mounting nut. The tapered portion of the inner member can be retracted by the expanding piece to follow and expand the expanding piece. Therefore, the post-installed anchor can obtain a higher fixing force even in a normal installed state, and the rigidity of the entire anchor can be greatly increased. In addition, it is possible to further increase resistance when a load is applied to the mounting bolt and the mounting bolt is pulled.

In the method for removing a post-installed anchor of the present invention, the post-installed anchor of the present invention is driven into a drilled hole in concrete with the expansion piece expanded by entering the tapered portion of the inner member, and the female screw of the inner member. A method for removing a post-installed anchor from a structure in which the expansion piece is expanded following the tightening of the mounting nut against the mounting bolt screwed into the hole, wherein a female threaded hole is formed through and has a male thread at least on the tip end side. The male thread of the attachment provided with is screwed into the female thread of the sleeve, the male thread of the extracting bolt is screwed into the female threaded hole of the attachment, and the tip of the extracting bolt is brought into contact with the inner member. and a second step of extracting the sleeve screwed to the attachment by rotating the extraction bolt while pushing the inner member with the tip of the extraction bolt. and
According to this, the sleeve can be easily extracted by rotating the extracting bolt while pushing the inner member with the tip of the extracting bolt.

In the method for removing a post-installed anchor of the present invention, when removing the post-installed anchor having an engaging portion on the distal end side of the female threaded hole of the inner member, the post-installed anchor is pushed in before the first step. A step of engaging a rod with the engaging portion and pushing the inner member deep into the hole is performed. Further, in the method for removing a post-installed anchor of the present invention, the post-installed anchor of the present invention is driven into a hole of concrete by enlarging the expansion piece by entering the tapered portion of the inner member. A structure in which the expansion piece is expanded following a state in which a space is formed in the hole in which the inner member can be pushed inwardly by tightening the mounting nut against the mounting bolt screwed into the female threaded hole. In a method for removing a post-installed anchor, the engagement formed on the tip surface of a push rod for pushing the inner member deep into the engagement hole on the tip side of the female threaded hole of the inner member. Engaging projections having shapes corresponding to the holes are engaged, and the pushing rod is driven to push the inner member into the inner part of the hole, so that the inner member and the sleeve are cut off or close to being cut off. and a first step of screwing the male thread of a removal attachment having a female threaded hole through it and having a male thread at least on the tip side thereof into the female thread of the sleeve, and removing the male thread of the withdrawal bolt. a second step of screwing the tip of the extracting bolt into the female threaded hole of the attachment and abutting the tip of the extracting bolt against the inner member; and rotating the extracting bolt while pushing the inner member with the tip of the extracting bolt. a third step of extracting the sleeve screwed to the removal attachment by moving the sleeve. Further, in the method for removing a post-installed anchor of the present invention, the post-installed anchor of the present invention is driven into a hole of concrete by enlarging the expansion piece by entering the tapered portion of the inner member. A structure in which the expansion piece is expanded following a state in which a space is formed in the hole in which the inner member can be pushed inwardly by tightening the mounting nut against the mounting bolt screwed into the female threaded hole. In the method for removing the post-installed anchor, the male threaded portion of the pushing rod for pushing the inner member into the hole is screwed into the small diameter female threaded hole on the distal end side of the female threaded hole of the inner member. a first step of rotating the pushing rod to push the inner member into the inner part of the hole to bring the inner member and the sleeve into a cut state or a near cut state; The male thread of a removal attachment having a male thread at least on the tip side is screwed into the female thread of the sleeve, and the male thread of the removal bolt is screwed into the female thread hole of the removal attachment to remove the removal attachment. a second step of abutting the tip of the extraction bolt against the inner member; and a third step of extracting the sleeve.
According to this, by engaging the push bar with the engaging portion and pushing the inner member into the inner part of the hole, the inner member can be released from the expansion piece of the sleeve or the pressing state can be loosened, which makes it easier and more reliable. The sleeve can be pulled out immediately.

Advantageous Effects of Invention According to the present invention, it is possible to obtain a post-installed anchor that has a high anchoring force, can prevent slipping out of concrete, and can be easily removed when unnecessary.

(a) is a front view of the post-installed anchor of the first embodiment according to the present invention, (b) is a longitudinal sectional view of the post-installed anchor of the first embodiment, and (c) is the mounting of the post-installed anchor of the first embodiment. The front view which shows the mounting nut, washer, and mounting bolt which are used for this. (a) to (e) are cross-sectional explanatory diagrams for explaining a step of setting a construction anchor after the first embodiment. (a) is a front view of the push rod used in the post-installed anchor removal process of the first embodiment, (b) is a front view of the attachment used in the removal process, and (c) is a longitudinal section of the attachment used in the removal process. Figure, (d) is a front view of the extraction bolt used in the removal process. (a) to (e) are cross-sectional explanatory views for explaining the first half of the process of removing the installed anchor after the first embodiment. (a) to (d) are cross-sectional explanatory views for explaining the latter half of the process of removing the installed anchor after the first embodiment. (a) is a front view of a post-installed anchor of a second embodiment according to the present invention, and (b) is a longitudinal sectional view of a post-installed anchor of the second embodiment. FIG. 11 is a front view of a push rod used in a step of removing post-installed anchors in the second embodiment; (a) to (e) are cross-sectional explanatory diagrams for explaining a step of setting and removing a construction anchor after the second embodiment. (a) is a vertical cross-sectional view of a conventional main body driving-type anchor, (b) is an explanatory diagram explaining attachment of an attached object by a conventional main body driving-type anchor, and (c) is a conventional sleeve driving-type anchor. FIG. 4D is a vertical cross-sectional view, and (d) is an explanatory diagram for explaining attachment of an attachment using a conventional sleeve-driven anchor.

[Anchor installed after the first embodiment]
As shown in FIG. 1, the post-installed anchor 1 according to the first embodiment of the present invention is an inner member 2 in which a tapered portion 22 is provided on the distal end side of a substantially cylindrical base portion 21, the diameter of which gradually increases toward the distal end. A sleeve 3 having an expansion piece 33 divided by a slit 32 cut from the front end of a substantially cylindrical main body 31, and a female screw 34 formed on the inner circumference of the main body 31 on the rear end side. Prepare.

The inner member 2 is provided with a female threaded hole 24 that opens at a rear end surface 23 , and a male thread 41 formed on the outer circumference of the mounting bolt 4 , which will be described later, can be screwed into the female threaded hole 24 . An engaging portion capable of engaging a pushing rod 8 for pushing the inner member 2 deep into the hole and a pull-out bolt 10 is provided on the distal end side of the female threaded hole 24 of the inner member 2, which is the first embodiment. The engaging portion of is formed by a substantially conical engaging hole 25 , and the engaging hole 25 is provided inside the tapered portion 22 adjacent to the tip of the female screw hole 24 .

When the expansion piece 33 of the post-installed anchor 1 is not expanded, the base portion 21 of the inner member 2 is embedded in the expansion piece 33 of the sleeve 3, and substantially the entire tapered portion 22 is exposed from the distal end of the expansion piece 33. are arranged as follows. When expanding the expansion piece 33, the sleeve 3 is driven toward the distal end of the inner member 2, so that the tapered portion 22 enters the expansion piece 33 and the expansion piece 33 is expanded (see FIG. 2).

When the post-installed anchor 1 is installed on the concrete 100 described later and the attachment 110 is attached, the attachment bolt 4, the washer 5, and the attachment nut 6 shown in FIG. 1(c) are used. The mounting bolt 4 is a fully threaded bolt having a male thread 41 formed on the outer periphery over the entire length, and is screwable into the female threaded hole 24 of the inner member 2 . The washer 5 can be externally inserted onto the mounting bolt 4 , and the mounting nut 6 can be screwed onto the mounting bolt 4 .

When constructing and installing the post-installed anchor 1 in the concrete 100 of the first embodiment, as shown in FIGS. After the unexpanded state, the construction anchor 1 is inserted into the hole 101 with the inner member 2 on the inner side of the hole. Next, as shown in FIG. 2(c), a driving rod 71 is brought into contact with the rear end surface of the sleeve 3, and the driving rod 71 is driven with a hammer 72 to drive the sleeve 3 into the inner part of the hole. The tapered portion 22 of the sleeve 3 is relatively inserted into the expansion piece 33 of the sleeve 3 to expand the expansion piece 33 , and the expansion piece 33 is bitten into the hole wall of the hole 101 .

After that, as shown in FIGS. 2(d) and (e), the mounting bolt 4 is screwed into the female threaded hole 24 of the inner member 2, the mounting object 110 is externally fitted onto the mounting bolt 4 screwed to the inner member 2, A washer 5 is fitted onto the mounting bolt 4 outside the mounting object 110 , and a mounting nut 6 is screwed onto the mounting bolt 4 . By tightening the mounting nut 6 on the mounting bolt 4, the inner member 2 is pulled toward the opening of the hole 101 as indicated by the thick arrow in FIG. 2(e). As the inner member 2 is pulled, the expansion piece 33 is expanded, and the inner member 2 is pulled up to create a space at the bottom of the hole 101 or enlarge the space at the bottom of the hole.

In the installation structure of the post-installed anchor 1 constructed in this way, the expansion piece 33 of the post-installed anchor 1 is expanded by entering the tapered portion 22 of the inner member 2, and the mounting bolt 4 is screwed to the inner member 2. The mounting nut 6 is tightened to follow and expand, and the post-installed anchor 1 has a structure in which a preload is applied, and the rigidity of the post-installed anchor 1 becomes very high.

When removing the post-installed anchor 1 from the installation structure of the post-installed anchor 1, the push rod 8 in FIG. 3(a), the attachment 9 in FIG. 10 is used. The pushing rod 8 is formed with a diameter that allows it to be inserted into the female threaded hole 24 of the sleeve 3 and the inner member 2, and an engaging projection 81 is formed on its tip end surface. The engaging protrusion 81 is capable of contacting and engaging with the engaging hole 25 corresponding to the engaging portion of the inner member 2, and is formed in a shape corresponding to the engaging hole 25. It is formed in a substantially conical shape corresponding to the substantially conical shape.

The attachment 9 has a substantially cylindrical shape with a female threaded hole 91 formed therethrough. The pull-out bolt 10 is a headed bolt having a shaft portion 11 and a head portion 12. A male thread 13 is formed on the rear portion of the shaft portion 11, and an engaging projection 15 is formed on a tip end surface 14 thereof. The engaging projection 15 is capable of contacting and engaging with an engaging hole 25 corresponding to the engaging portion of the inner member 2, and is formed in a shape corresponding to the engaging hole 25. It is formed in a substantially conical shape corresponding to the substantially conical shape.

When removing the post-installed anchor 1, as shown in FIGS. 4(a) and 4(b), the mounting nut 6, the washer 5, the attachment 110, and the mounting bolt 4 are removed from the post-installed anchor 1, and then installed. After that, the pushing rod 8 is inserted into the sleeve 3 of the construction anchor 1 and the female threaded hole 24 of the inner member 2, and the engaging projection 81 of the pushing rod 8 is brought into contact with and engaged with the engaging hole 25 of the inner member 2, Positioning of the pushing rod 8 is performed. In this state, the inner member 2 is pushed deep into the hole by driving the pushing rod 8 with a hammer 82 (see the thick arrow in FIG. 4(b)), and the edge of the inner member 2 and the sleeve 3 is cut or brought into a state close to cutting. do.

After removing the push rod 8, as shown in FIG. 4(c), the male thread 93 of the attachment 9 is screwed into the female thread 34 of the sleeve 3 to attach the attachment 9 to the sleeve 3, and then, as shown in FIG. As shown, the male thread 13 of the extracting bolt 10 is screwed into the female threaded hole 91 of the attachment 9 and the tip of the extracting bolt 10 is brought into contact with the inner member 2 . In this example, the engaging protrusion 15 at the tip of the withdrawal bolt 10 is brought into contact with and engaged with the engaging hole 25 corresponding to the engaging portion of the inner member 2, and alignment is also performed.

After that, when the extraction bolt 10 is rotated by an electric tool 15 or the like while pushing the inner member 2 in contact with the tip of the extraction bolt 10, the attachment 9 and the attachment 9 are screwed to the extraction bolt 10. The sleeve 3 is pulled out of the hole 101 and screwed to the attachment 9 (see FIGS. 4(d) and 4(e)). At the time of this extraction, the expansion piece 33 of the sleeve 3 springs back and almost returns to the shape before expansion, and emerges from the perforation 101 in a state of being narrowed to a shape smaller than the diameter of the perforation.

After that, the male thread 93 of the attachment 9 and the female thread 34 of the sleeve 3 are unscrewed, the attachment 9 and the extraction bolt 10 are removed, and the sleeve 3 is removed from the hole 101 (FIGS. 5A and 5B). reference). Further, for example, using the mounting bolt 4 or a bolt provided with the same external thread as the external thread 41 of the mounting bolt 4, the external thread 41 or the like is slightly screwed into the internal thread hole 24 of the inner member 2, and then the bolt is pulled out together. The inner member 2 remaining on 101 is removed (see FIG. 5(c)). Then, the hollow bore 101 is filled with a filler 16 as necessary and closed (FIG. 5(d)), or reused for driving another post-installed anchor of the same diameter or the like. be.

According to the first embodiment, by screwing the mounting bolt 4 into the female threaded hole 24 of the inner member 2, when a load is applied to the mounting bolt 4, the tapered portion 22 is pulled in by the expansion piece 33 and the expanding force is generated. can be generated and the fixing power can be increased. Therefore, the post-construction anchor 1 can exhibit a high fixing force and can prevent slipping out of the concrete 100 with high reliability without a problem such as slipping out of the tip cone of the main body driving type anchor. In addition, when the post-installed anchor 1 becomes unnecessary in the installation structure of the post-installed anchor 1, the sleeve 3 can be pulled out using the internal thread 34 of the sleeve 3, and the post-installed anchor 1 can be easily removed when unnecessary. can do. Therefore, it is also possible to reuse the perforations 101 formed in the concrete 100 for installing the post-installed anchors 1 .

Further, according to the configuration in which the inner member 2 is provided with the engaging hole 25 for engaging the pushing rod 8, by engaging the pushing rod 8 with the engaging hole 25 and pushing the inner member 2 into the inner part of the hole, the sleeve The insertion of the inner member 2 into the extension piece 33 of 3 can be released or the pressing state can be relaxed, and the sleeve 3 can be pulled out more easily and reliably.

In addition, in the installation structure or construction method of the post-installed anchor 1, the tightening of the mounting bolt 4 by the mounting nut 6 draws the inner member 2, and the tapered portion 22 of the inner member 2 is drawn in by the expansion piece 33 and expanded accordingly. Therefore, a higher anchoring force can be obtained even in a normal installation state, and the rigidity of the entire anchor can be greatly increased. In addition, resistance to the mounting bolt 4 when a load is applied to the mounting bolt 4 and the mounting bolt 4 is pulled can be further increased.

In the method of removing the post-installed anchor 1, the sleeve 3 can be easily extracted by rotating the extraction bolt 10 while pushing the inner member 2 with the tip of the extraction bolt 10. - 特許庁Further, when the push rod 8 is engaged with the engagement hole 25 in advance and the inner member 2 is pushed into the hole, the insertion of the inner member 2 into the extension piece 33 of the sleeve 3 is released or the pressing state is loosened. so that the sleeve 3 can be pulled out more easily and reliably.

[Anchor installed after the second embodiment]
As shown in FIG. 6, the post-installed anchor 1a according to the second embodiment of the present invention is an inner member 2a provided with a tapered portion 22a that gradually increases in diameter toward the distal end of a substantially cylindrical base portion 21a. and a sleeve 3 having the same configuration as that of the first embodiment.

The inner member 2a is provided with a female threaded hole 24a that opens at a rear end surface 23a, and a male thread 41 formed on the outer periphery of the mounting bolt 4 having the same structure as in the first embodiment can be screwed into the female threaded hole 24a. there is An engaging portion capable of engaging a pushing rod 8a for pushing the inner member 2a deep into the hole is provided on the distal end side of the female threaded hole 24a of the inner member 2a. , and a female screw hole 26a formed with a smaller diameter than the female screw hole 24a. The female threaded hole 26a is provided inside the tapered portion 22a so as to communicate with the female threaded hole 24a adjacent to the tip of the female threaded hole 24a.

When the expansion piece 33 of the post-installed anchor 1a is not expanded, the base portion 21a of the inner member 2a is embedded in the expansion piece 33 of the sleeve 3, and substantially the entire tapered portion 22a is exposed from the tip of the expansion piece 33. are arranged as follows. When expanding the expansion piece 33, the sleeve 3 is driven toward the tip of the inner member 2a, so that the tapered portion 22a enters the expansion piece 33 and the expansion piece 33 is expanded (see FIG. 8A). .

When the post-installed anchor 1a of the second embodiment is installed on the concrete 100 and the attachment 110 is attached, the mounting bolt 4, the washer 5, and the mounting nut 6 having the same configurations as those of the first embodiment are used (Fig. 8 ( a) see). The process for constructing and installing the post-installed anchor 1a on the concrete 100 in the second embodiment is basically the same as the process for constructing and installing the post-installed anchor 1 on the concrete 100 in the first embodiment.

That is, the unexpanded post-installed anchor 1a is inserted into the hole 101 formed in the concrete 100 and cleaned, with the inner member 2a on the inner side of the hole. Next, the sleeve 3 is driven deep into the hole, and the tapered portion 22a of the inner member 2a is relatively inserted into the expansion piece 33 of the sleeve 3 to expand the expansion piece 33, and the expansion piece 33 bites into the hole wall of the hole 101. Let

After that, the mounting bolt 4 is screwed into the female threaded hole 24a of the inner member 2a, the attachment 110 is externally fitted to the mounting bolt 4 screwed to the inner member 2a, and the washer 5 is removed from the attachment bolt 4 outside the attachment 110. Then, the mounting nut 6 is screwed onto the mounting bolt 4 . By tightening the mounting nut 6 to the mounting bolt 4, the inner member 2a is pulled toward the opening of the hole 101 as indicated by the thick arrow in FIG. 8(a). By pulling the inner member 2a, the expansion piece 33 is expanded accordingly.

When removing the post-installed anchor 1a from the installation structure of the post-installed anchor 1a, the push rod 8a of FIG. 7, the attachment 9 having the same configuration as the first embodiment, and the extraction bolt 10 are used. The pushing rod 8a is formed with a diameter that allows it to be inserted into the female threaded hole 24a of the sleeve 3 and the inner member 2a, and has a male thread 83a that can be screwed into the female threaded hole 26a that constitutes the engaging portion. The pushing rod 8a is engaged with the female threaded hole 26a by screwing the male screw 83a into the female threaded hole 26a. The pushing rod 8a shown in the figure has a male thread 83a along the entire length of the shaft of the headed bolt. can be applied as long as a male thread 83a is formed in a part of the . Further, the tip surface 14 of the pull-out bolt 10 is formed to have a diameter larger than that of the female screw hole 26a of the inner member 22a, so that it cannot be inserted into the female screw hole 26a.

When removing the post-installed anchor 1a, as shown in FIG. 8(b), the mounting nut 6, washer 5, attachment 110, and mounting bolt 4 are removed from the post-installed anchor 1a, and then the installed post-installed anchor is removed. The pushing rod 8a is inserted into the sleeve 3 of 1a and the female threaded hole 24a of the inner member 2a, the male thread 83a of the pushing rod 8a is screwed into the female threaded hole 26a of the inner member 2a and engaged, and the pushing rod is pulled by an electric tool 15m or the like. By rotating the inner member 8a, the inner member 2a is pushed into the hole (see the thick arrow in FIG. 8(b)), and the edge of the inner member 2a and the sleeve 3 is cut or nearly cut.

After removing the push-in rod 8a, as shown in FIG. The male screw 13 is screwed into the female screw hole 91 of the attachment 9, and the tip of the extracting bolt 10 is brought into contact with the inner member 2a. In this example, the tip end surface 14 of the withdrawal bolt 10 abuts against the peripheral edge of the opening of the female screw hole 26a of the inner member 2a.

Thereafter, when the extraction bolt 10 is rotated by an electric tool 15 or the like while pushing the inner member 2a in contact with the tip of the extraction bolt 10, the attachment 9 and the attachment 9 are screwed to the extraction bolt 10. The sleeve 3 is pulled out of the hole 101 and screwed to the attachment 9 (see FIGS. 8(d) and 8(e)). At the time of this extraction, the expansion piece 33 of the sleeve 3 springs back and almost returns to the shape before expansion, and emerges from the perforation 101 in a state of being narrowed to a shape smaller than the diameter of the perforation. After that, the removal process similar to that of the post-installed anchor 1 in the first embodiment is performed.

According to the second embodiment, a corresponding effect can be obtained from a configuration corresponding to the first embodiment.

[Scope of invention disclosed in this specification]
In addition to each invention and each embodiment listed as an invention, the invention disclosed in this specification is specified by changing these partial contents to other contents disclosed in this specification within the applicable range , or those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting these partial contents to the extent that partial effects can be obtained and making them general concepts encompasses The invention disclosed in this specification also includes the following contents and modifications.

For example, the engaging portion capable of engaging the push rod of the inner member in the post-installed anchor of the present invention may be other than the engaging hole 25 of the first embodiment and the female threaded hole 26a of the second embodiment. The present invention also includes a configuration in which the inner member is not provided with an engaging portion capable of engaging a pushing rod that is pushed into the inner part of the hole. The female threaded hole opening at the rear end surface of the inner member is preferably formed in the shape of a hole with a bottom. It is possible.

Further, in the first and second embodiments, the pushing rods 8, 8a are engaged with the engaging holes 25 and the female screw holes 26a corresponding to the engaging portions, and the inner members 2, 2a are pushed into the holes. The process of removing the post-installed anchor 1 has been described, but without performing this process, the external thread 93 of the attachment 9 is screwed into the internal thread 34 of the sleeve 3, and the external thread 13 of the withdrawal bolt 10 is threaded into the internal thread hole of the attachment 9. The present invention also includes a removal method in which the tip of the extraction bolt 10 is brought into contact with the inner member 2, 2a by screwing it into the screw 91. As shown in FIG.

In addition, the post-installed anchor of the present invention can be placed downward, upward, or sideways into concrete to construct an installation structure, and the placement direction is appropriate. Further included in the present invention is a method for removing the installed anchors after they have been driven and installed in any suitable driving direction. Further, in the first and second embodiments, the process of removing the post-installed anchors 1, 1a using the power tools 15, 15m has been described, but the removal process is performed using hand tools instead of the power tools 15, 15m. It is also possible to

INDUSTRIAL APPLICABILITY The present invention can be used when drilling holes in existing concrete and driving post-installed anchors.

Reference Signs List 1, 1a Post-installed anchor 2, 2a Inner member 21, 21a Base portion 22, 22a Tapered portion 23, 23a Rear end face 24, 24a Female screw hole 25 Engagement hole 26a Female screw hole 3 Sleeve 31 Main body 32 Slit 33 Expansion piece 34 Female screw 4 Mounting bolt 41 Male screw 5 Washer 6 Mounting nut 71 Driving rod 72 Hammer 8, 8a Pushing rod 81 Engaging projection 82 Hammer 83a Male screw DESCRIPTION OF SYMBOLS 9... Attachment 91... Female screw hole 92... Base part 93... Male screw 10... Withdrawal bolt 11... Shaft part 12... Head part 13... Male screw 14... Tip surface 15... Engagement projection 15, 15m... Electric tool 16... Filling material 100 Concrete 101 Perforation 110 Attachment 200 Main body driving anchor 201 Main body 202 Extension piece 203 Female thread 204 Tip cone 205 Attachment bolt 206 Washer 207 Nut 210 Concrete 211 Drill 220 Attachment DESCRIPTION OF SYMBOLS 300... Sleeve drive-in type anchor 301... Sleeve 302... Expansion piece 303... Taper bolt 304... Taper part 305... Male screw part 306... Washer 307... Spring washer 308... Nut 310... Concrete 311... Drilling 320... Attachment

Claims (6)

an inner member provided with a tapered portion that gradually expands in diameter toward the distal end on the distal end side of the base;
An expansion piece is provided on the front end side to expand by entering the tapered portion, and a sleeve is provided on the rear end side and has a female thread formed to the rear end to be screwed to the male thread of the removal attachment ,
The inner member is provided with a female threaded hole that opens at the rear end face, and a mounting bolt can be screwed into the female threaded hole ,
An engagement hole capable of being engaged with an engagement projection on a tip surface of a pushing rod for pushing the inner member into the hole is formed in a shape corresponding to the engagement projection on the distal end side of the female threaded hole of the inner member. A post -construction anchor characterized by: an inner member provided with a tapered portion that gradually expands in diameter toward the distal end on the distal end side of the base;
An expansion piece is provided on the front end side to expand by entering the tapered portion, and a sleeve is provided on the rear end side and has a female thread formed to the rear end to be screwed to the male thread of the removal attachment,
The inner member is provided with a female threaded hole that opens at the rear end face, and a mounting bolt can be screwed into the female threaded hole,
A small-diameter female threaded hole having a diameter smaller than that of the female threaded hole is provided on the distal end side of the female threaded hole of the inner member as an engaging portion that can be engaged by screwing a male threaded portion of a pushing rod for pushing the inner member into the hole. A post-installed anchor characterized in that it is formed . The post-installed anchor installation structure according to claim 1 or 2,
The expansion piece is expanded by the entry of the tapered portion of the inner member, and the post-installed anchor is driven into the hole of the concrete,
By tightening a mounting nut against a mounting bolt screwed into the female threaded hole of the inner member, the expansion piece expands in a state in which a space is formed in the hole so that the inner member can be pushed into the hole. A post-installation anchor installation structure characterized by: The method for constructing a post-installed anchor according to claim 1 or 2,
a first step of inserting the post-installed anchor into a hole in concrete and driving the sleeve to insert the tapered portion into the expansion piece to expand the expansion piece;
a second step of screwing a mounting bolt into the female threaded hole of the inner member;
By tightening the mounting nut on the mounting bolt, the inner member is pulled toward the opening side of the hole, and a space is formed in the hole into which the inner member can be pushed toward the inner side of the hole. A method of constructing a post-installed anchor, characterized by comprising a third step of follow-up expansion. 2. The post-installed anchor according to claim 1 , wherein said mounting bolt is driven into a drilled hole in concrete by said expansion piece being expanded by entry of said tapered portion of said inner member, and screwed into said female threaded hole of said inner member. A method of removing a post-installed anchor from a structure in which the expansion piece is followed and expanded in a state in which a space is formed in the hole so that the inner member can be pushed into the hole by tightening the mounting nut against the hole. hand,
An engagement protrusion having a shape corresponding to the engagement hole formed on the tip surface of a pushing rod for pushing the inner member deep into the hole is engaged with the engagement hole on the tip side of the female threaded hole of the inner member. a first step of driving the pushing rod to push the inner member into the inner part of the hole to bring the inner member and the sleeve into a cut-off state or a near cut-off state;
The male thread of a withdrawal attachment having a female threaded hole formed therethrough and a male thread provided at least on the tip side is screwed into the female thread of the sleeve , and the male thread of the removal bolt is screwed into the female threaded hole of the removal attachment. a second step of screwing the extraction bolt into contact with the inner member;
A third step of extracting the sleeve screwed to the removal attachment by rotating the extraction bolt while pushing the inner member with the tip of the extraction bolt. Anchor removal method. 3. The post-installed anchor according to claim 2, wherein said expansion piece is expanded by entry of said tapered portion of said inner member and driven into a hole in concrete, and is attached to a mounting bolt screwed into said female threaded hole of said inner member. A method of removing a post-installed anchor from a structure in which the expansion piece is followed and expanded in a state in which a space is formed in the hole by tightening the mounting nut so that the inner member can be pushed into the hole. ,
A male threaded portion of a pushing rod for pushing the inner member into the hole is screwed into a small-diameter female threaded hole on the distal end side of the female threaded hole of the inner member, and the pushing rod is rotated to displace the inner member. a first step in which the inner member and the sleeve are pushed into the inner part of the hole to bring the inner member and the sleeve into a cut-off state or a near cut-off state;
The male thread of a withdrawal attachment having a female threaded hole formed therethrough and a male thread provided at least on the tip side is screwed into the female thread of the sleeve, and the male thread of the removal bolt is screwed into the female threaded hole of the removal attachment. a second step of screwing the extraction bolt into contact with the inner member;
A third step of extracting the sleeve screwed to the removal attachment by rotating the extraction bolt while pushing the inner member with the tip of the extraction bolt. Anchor removal method.

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