JP7267813B2 - Anchor, anchor extraction tool, anchor unit, anchor removal method - Google Patents

Description

The present invention relates to an anchor, an anchor extraction tool, an anchor unit, and an anchor removal method.

Metal expansion anchors are mainly used when attaching articles such as various types of equipment to concrete frames that make up structures such as buildings, roads, tunnels, etc., or when fixing temporarily to install temporary structures. Used. A metal expansion anchor is inserted into a hole formed in the frame and fixed.

When the above metal expansion anchors are used for mounting equipment or fixing temporary structures, it may be necessary to completely remove the metal expansion anchors that are no longer needed after use without leaving any residue on the frame. In the case of a male-threaded metal expansion anchor, it is possible to cut off the protruding male-threaded portion so that it does not protrude from the frame surface. However, some of the anchors remain inside the frame after they are cut, and even if the surface of the frame is repaired, the remaining anchors rust over time, staining the finished surface of the frame and swelling due to rust. may affect the frame. Patent Literature 1 listed below discloses a puller for pulling out a metal expansion anchor from a building frame. The extractor clamps the ends of the sleeve to extract the sleeve from the bolt.

JP 2016-185569 A

However, when using the extractor, it is necessary to cut the frame around the sleeve with a drill in order to sandwich the sleeve installed in the hole of the frame. Therefore, there is a problem that it takes time and effort to pull out the anchor.

In view of the above circumstances, the present invention provides an anchor, an anchor extracting tool, an anchor unit, and an anchor removal method that allows the extraction work from the skeleton to be easily performed and the anchor to be completely removed without leaving the anchor inside the skeleton. One of the purposes is to provide

In order to solve the above problems, an anchor according to a first aspect of the present invention includes a cylindrical sleeve that extends along a central axis and has an expanded portion on one side in the axial direction; a nut attached to the anchor bolt; and a washer provided between the nut and the sleeve and having a first portion and a second portion, the sleeve comprising , a groove formed on an outer peripheral surface, the first portion and the second portion being portions perpendicular to the axial direction, the first portion being located on one side and the second portion in the axial direction relative to the second portion; Located radially outward, at least a portion of the groove is located axially between the first portion and the second portion contacting the sleeve.

In the above aspect, it is preferable that the groove is an annular groove formed in the entire circumferential direction of the outer peripheral surface.

In the above aspect, in the axial direction, it is preferable that the end portion of the groove portion on one side in the axial direction is located on the other side in the axial direction relative to the first portion.

Further, the anchor according to the second aspect of the present invention includes a cylindrical sleeve that extends along the central axis and has an expanded portion on one side in the axial direction, and a tapered portion that is inserted into the sleeve and expands the expanded portion. a nut attached to the anchor bolt; and a washer provided between the nut and the sleeve and having a first portion and a second portion, the sleeve being formed on an outer peripheral surface of the wherein the first portion and the second portion are portions orthogonal to the axial direction, the first portion being on one side in the axial direction and radially outward of the second portion; and at least a portion of the first threaded portion is located between the first portion and the second portion contacting the sleeve in the axial direction.

Further, an anchor extracting tool according to a third aspect of the present invention is an anchor extracting tool used when removing the anchor of the first aspect from a construction surface, comprising a cylindrical main body and the main body a convex portion extending radially inward from the inner surface of the sleeve and engaged with the groove formed in the sleeve; and a pull-out bolt that is attached so as to pass through the main body in the axial direction and is capable of contacting the other end of the anchor bolt in the axial direction.

Further, an anchor extracting tool according to a fourth aspect of the present invention is an anchor extracting tool used when removing the anchor of the second aspect from a construction surface, comprising a cylindrical main body and the main body a second threaded portion provided on the inner surface on one side in the axial direction of the sleeve and capable of being screwed into the first threaded portion formed on the sleeve; a pull-out bolt capable of contacting the other end of the anchor bolt in the axial direction.

Further, an anchor unit according to a fifth aspect of the present invention includes the anchor according to the first aspect and the anchor extracting tool according to the third aspect.

Further, an anchor unit according to a sixth aspect of the present invention includes the anchor of the second aspect and the anchor extracting tool of the fourth aspect.

Further, an anchor removing method according to a seventh aspect of the present invention is an anchor removing method using the anchor unit of the fifth aspect, wherein after removing the nut and the washer, the anchor extracting tool is a step of attaching the main body to the groove of the sleeve; and tightening the pull-out bolt to press the anchor bolt to one side in the axial direction and move the main body to the other side in the axial direction. and withdrawing the sleeve.

An anchor removing method according to an eighth aspect of the present invention is an anchor removing method using the anchor unit of the sixth aspect, wherein after removing the nut and the washer, the anchor extracting tool is attaching the first threaded portion to the second threaded portion of the sleeve; tightening the pull-out bolt to press the anchor bolt to one side in the axial direction and to move the body portion to the other side in the axial direction; and withdrawing the sleeve together with the body portion.

In addition, a method for removing an anchor according to a ninth aspect of the present invention includes a cylindrical sleeve that extends along a central axis and has an expanded portion on one side in the axial direction; A method for removing an anchor comprising an anchor bolt having a tapered portion from a construction surface, wherein an anchor extracting tool is engaged with a groove formed in the outer peripheral surface of the sleeve protruding from the construction surface, A pull-out bolt attached to the anchor extracting tool is tightened, and the sleeve is moved to the other axial side together with the anchor extracting tool by a reaction force that presses the anchor bolt to one side in the axial direction.

In addition, a method for removing an anchor according to a tenth aspect of the present invention includes: a cylindrical sleeve extending along a central axis and having an expanded portion on one side in the axial direction; A method for removing an anchor from a construction surface comprising an anchor bolt having a tapered portion, wherein a first thread formed on the outer peripheral surface of the sleeve protruding from the construction surface is fitted with a second thread of an anchor extraction tool. are screwed together, the pull-out bolt attached to the anchor pull-out tool is tightened, and the sleeve is moved axially along with the anchor pull-out tool by a reaction force that presses the anchor bolt to one side in the axial direction. move to the other side.

According to one aspect of the present invention, there is provided an anchor, an anchor extraction tool, an anchor unit, and an anchor removal method, which can be easily pulled out from the building frame and can be completely removed without leaving the anchor in the building frame. provided.

FIG. 4 is a configuration diagram of an anchor and a tool that constitute an anchor unit; FIG. 4 is a diagram showing the appearance of an anchor that constitutes the anchor unit; It is a figure which shows the construction method of an anchor. It is a figure which shows the construction method of an anchor. It is a figure which shows the principal part structure of the tool for anchor extraction. It is a figure which shows the withdrawal method of an anchor. It is a figure which shows the withdrawal method of an anchor. It is a figure which shows the withdrawal method of an anchor. It is a figure which shows the withdrawal method of an anchor. It is a figure which shows the withdrawal method of an anchor. It is a figure which shows the withdrawal method of an anchor. It is a block diagram of the anchor and tool which comprise the anchor unit of a modification.

FIG. 1 is a configuration diagram of an anchor and a tool that constitute an anchor unit of one embodiment.
FIG. 2 is a diagram showing the appearance of an anchor that constitutes an anchor unit of one embodiment.

The Z-axis direction shown as appropriate in each drawing is a vertical direction in which the positive side is the upper side and the negative side is the lower side. A central axis C appropriately shown in each figure is a virtual line parallel to the Z-axis direction and extending in the vertical direction. In the following description, the axial direction of the central axis C, that is, the direction parallel to the vertical direction is simply referred to as the "axial direction", the radial direction around the central axis C is simply referred to as the "radial direction", and the central axis C is simply referred to as the "circumferential direction". In this embodiment, the lower side corresponds to one side in the axial direction, and the upper side corresponds to the other side in the axial direction. Note that the vertical direction, upper side, and lower side are simply names for explaining the relative positional relationship of each part, and the actual arrangement relationship etc. is not the arrangement relationship etc. indicated by these names. may

As shown in FIG. 1, the anchor unit 20 of this embodiment includes an anchor 1 and an anchor extraction tool 10. As shown in FIG. The anchor extraction tool 10 is a tool used when removing the anchor 1 from the construction surface. The configuration of the anchor extracting tool 10 will be described later.

As shown in FIG. 2, the anchor 1 of this embodiment includes an anchor bolt 2 extending along a central axis C, a sleeve 3, a nut 4, a washer 5, and a special washer (washer) 6. The anchor 1 of this embodiment is a so-called tightening-type metal expansion anchor that expands the sleeve 3 by tightening the nut 4 . Before construction, the anchor 1 has a nut 4 attached to the anchor bolt 2 so that the anchor bolt 2, the sleeve 3, the nut 4, the washer 5 and the special washer 6 are integrally assembled to form a unit. In addition, in FIG. 2, in order to make the drawing easier to see, a partial cross section is shown.

A male threaded portion 2n is formed on the outer peripheral surface of the anchor bolt 2 along the axial direction. The anchor bolt 2 has a tapered portion 7 at a lower tip portion 2b on one axial side (lower side in FIG. 2).

The sleeve 3 is cylindrical as a whole. The sleeve 3 has an extension 3a on its axial lower side. The extended portion 3a has a plurality of slits 3s formed at intervals in the circumferential direction around the central axis C and extending in the axial direction. The extension part 3a includes extension members 3t between slits 3s adjacent to each other in the circumferential direction. The expansion part 3a has substantially the same outer diameter as the tapered part 7 of the anchor bolt 2 as a whole including the expansion member 3t. The expansion member 3t of the expansion portion 3a can be deformed radially outward by being pressed by a taper portion 7, which will be described later.

The sleeve 3 has a groove 8 formed in an axially upper outer peripheral surface 3b. In this embodiment, the groove portion 8 is an annular groove formed over the entire circumferential direction of the outer peripheral surface 3b.

The tapered portion 7 has an enlarged diameter surface 7f that widens radially outward from the other side in the axial direction toward the one side. The tapered portion 7 is inserted inside the sleeve 3, and expands the expansion portion 3a (expansion member 3t) of the sleeve 3 radially outward by the enlarged diameter surface 7f.

The nut 4 has a female threaded portion 4n that meshes with the male threaded portion 2n of the anchor bolt 2 . The nut 4 has, on its outer peripheral surface, a tool engaging portion with which a tool such as a socket (not shown) is engaged. The washer 5 is composed of, for example, a flat washer or a spring washer, and is arranged between the nut 4 and the special washer 6 . Note that the washer 5 can be omitted if necessary.

A special washer 6 is arranged between the nut 4 and the washer 5 . The special washer 6 is formed by, for example, bending a plate-like member by press working or the like. The special washer 6 has a first portion 6A, a second portion 6B and a third portion 6C. The first portion 6A and the second portion 6B are portions orthogonal to the axial direction. The first portion 6A and the second portion 6B are connected by a third portion 6C. The third portion 6C is a portion extending in the axial direction and connects the radially inner end of the first portion 6A and the radially outer end of the second portion 6B. As a result, the first portion 6A is located on one side in the axial direction and radially outward of the second portion 6B.

The upper surface 6B1 of the second portion 6B is the surface that contacts the washer 5. As shown in FIG. A lower surface 6B2 of the second portion 6B is a surface that contacts the axially upper end portion 3c of the sleeve 3 . A lower surface 6A2 of the first portion 6A is a surface that contacts the construction surface of the anchor 1. As shown in FIG. A convex portion (not shown) of the end portion 3c of the sleeve 3 is fitted to the second portion 6B. As a result, the rotation of the sleeve 3 about the central axis C with respect to the special washer 6 (second portion 6B) is restricted.

The groove 8 is axially positioned between the first portion 6A and the second portion 6B that contacts the sleeve 3 . In the present embodiment, the upper end portion 8b of the groove portion 8 in the axial direction is located above the first portion 6A in the axial direction, and the lower end portion 8a of the groove portion 8 in the axial direction is the first portion in the axial direction. It is at the same position as the lower surface 6A2 of the portion 6A. That is, the groove portion 8 is positioned axially between the lower surface 6A2 of the first portion 6A and the lower surface 6B2 of the second portion 6B.

The special washer 6 has a concave portion 9 recessed upward in the axial direction. The recess 9 is formed by a step formed between a lower surface 6A2 of the first portion 6A and a lower surface 6B2 of the second portion 6B located above the lower surface 6A2 in the axial direction. In the anchor 1 of this embodiment, the groove 8 formed in the sleeve 3 is completely accommodated in the recess 9 of the special washer 6 .

Next, a method for constructing the anchor 1 in the anchor unit 20 of this embodiment will be described with reference to the drawings.
3A and 3B are diagrams showing a construction method of the anchor 1. FIG. In addition, in FIG. 3A and FIG. 3B, in order to make the drawing easy to see, a partial cross section is shown.
As shown in FIG. 3A, in order to construct the anchor 1, first, an attachment 110 is installed on a concrete skeleton 100 (for example, a floor surface) of a building or structure to which the anchor 1 is to be installed. A pilot hole 101 is formed in the concrete skeleton 100 through the mounting hole 111 provided in 110 . The pilot hole 101 is formed with a preset diameter and depth according to the thickness of the anchor 1 and attachment 110 . In this embodiment, a case where a temporary guardrail, which is a heavy object, is installed as the attachment 110 will be taken as an example.

Subsequently, the bottom tip 2b side of the anchor bolt 2 of the anchor 1 is inserted into the mounting hole 111 of the fixture 110 and the prepared hole 101 formed in the concrete frame 100 . The anchor 1 is inserted into the prepared hole 101 until the lower surface 6A2 of the first portion 6A of the special washer 6 contacts the surface 110a of the attachment 110. As shown in FIG.

As described above, the anchor 1 of this embodiment is constructed with the lower surface 6A2 of the first portion 6A of the special washer 6 in contact with the surface 110a of the attachment 110. As shown in FIG. At this time, the groove portion 8 of the sleeve 3 accommodated in the concave portion 9 of the special washer 6 protrudes from the surface 110a of the attachment 110. As shown in FIG.

Subsequently, a tool K such as a socket is engaged with the nut 4 . Next, the installer rotates the tool to tighten the nut 4 . As shown in FIG. 3B , as the nut 4 is tightened, the anchor bolt 2 meshing with the nut 4 is displaced in a direction pulled up from the pilot hole 101 . Then, the enlarged diameter surface 7f of the tapered portion 7 provided at the upper tip portion 2a of the anchor bolt 2 expands the expanding member 3t of the expanding portion 3a radially outward. At this time, the expansion member 3 t is fixed in the pilot hole 101 by contacting the inner peripheral surface of the pilot hole 101 .

As described above, the installation of the anchor 1 into the prepared hole 101 formed in the concrete skeleton 100 and the work of fixing the attachment 110 onto the concrete skeleton 100 by the anchor 1 are completed.

According to the anchor 1 of the present embodiment, the provision of the special washer 6 allows the groove portion 8 of the sleeve 3 to protrude above the anchor installation surface (the surface 110a of the attachment 110). As a result, the anchor removal method using the anchor removal tool 10 can be performed simply.

When removing the anchor 1 of this embodiment, the anchor removal tool 10 shown in FIG. 1 is used. FIG. 4 is a diagram showing the main configuration of the anchor extracting tool 10. As shown in FIG. The anchor extracting tool 10 shown in FIG. 4 includes a vertically extending tubular main body 11 , a protrusion 12 , a notch 13 , and a center shaft (extraction bolt) 14 .

The body portion 11 has a substantially tubular tubular portion 15 and an upper lid portion 16 provided on the upper side of the tubular portion 15 . The convex portion 12 extends radially inward from the lower end portion of the inner surface 11a1 of the main body portion 11 (cylindrical portion 15). The convex portion 12 is provided on a portion of the inner surface 11a1 in the circumferential direction. The convex portion 12 is a portion that engages with a groove portion 8 formed in the sleeve 3 as described later. The vertical dimension of the projection 12 is smaller than the axial dimension of the groove 8 .

The notch 13 is an opening for guiding the sleeve 3 into the body portion 11 by guiding the convex portion 12 radially into the groove portion 8 formed in the sleeve 3 . The notch 13 is formed so as to communicate the outer peripheral surface 11a2 and the inner surface 11a1 of the body portion 11 (cylindrical portion 15). The notch 13 is composed of a first opening 13a and a second opening 13b arranged in order from the bottom to the top. A width H1 of the first opening 13a perpendicular to the vertical direction corresponds to the outer diameter of the groove 8 formed in the sleeve 3. As shown in FIG. The width H2 of the second opening 13b corresponds to the outer diameter of the portion of the sleeve 3 above the groove 8. As shown in FIG. The second opening 13b is a hole of a size that allows the tip portion of the center shaft 14 inserted into the main body 11 to be visible from the outside.

The center shaft 14 is a bolt attached to a female screw portion (screw portion) 16a provided so as to penetrate the upper lid portion 16 (body portion 11) in the vertical direction. The center shaft 14 can move up and down along the axial direction with respect to the body portion 11 . The center shaft 14 can come into contact with the axial upper side of the anchor bolt 2 of the anchor 1 accommodated in the body portion 11 as will be described later.

Next, a method for removing the anchor 1 in the anchor unit 20 of this embodiment will be described. In the method for removing the anchor 1 of this embodiment, the anchor removal tool 10 is attached to the anchor removal tool 10 in a state in which the anchor removal tool 10 is engaged with the groove 8 formed in the outer peripheral surface 3b of the sleeve 3 projecting from the construction surface. The center shaft 14 is tightened to move the sleeve 3 axially upward together with the anchor extracting tool 10 by a reaction force that presses the anchor bolt 2 axially downward.

Hereinafter, a method for removing the anchor 1 using the anchor extracting tool 10 will be specifically described with reference to the drawings. 5A to 5C and 6A to 6C are diagrams showing how the anchor 1 is removed. 5A to 5C and 6A to 6C are partially shown in cross section for easy viewing.

First, the nut 4 is loosened using a tool such as a socket, and the nut 4, washer 5 and special washer 6 are removed from the anchor bolt 2 as shown in FIG. 5A. When the anchor 1 is installed, the groove 8 of the sleeve 3 is housed in the recess 9 of the special washer 6 so that it is exposed to the surface of the concrete skeleton 100 . Therefore, when the special washer 6 is removed, the groove 8 of the sleeve 3 protrudes from the surface 110a of the attachment 110. As shown in FIG.

Subsequently, as shown in FIG. 5B, the anchor extracting tool 10 is attached to the groove portion 8 of the sleeve 3 protruding from the surface 110a of the attachment 110. Then, as shown in FIG. Specifically, the anchor extracting tool 10 is brought close to the sleeve 3 from the outside in the radial direction, and the projection 12 of the anchor extracting tool 10 is guided to the groove 8 formed in the sleeve 3 via the notch 13 . In this embodiment, the groove portion 8 of the sleeve 3 is guided into the main body portion 11 through the first opening portion 13a (see FIG. 4) of the notch 13, and the notch 13 is located above the groove portion 8 of the sleeve 3. It is guided into the main body 11 through the second opening 13b (see FIG. 4).

Subsequently, as shown in FIG. 5C, by tightening the center shaft 14, the tip 14a of the center shaft 14 is brought into contact with the upper tip 2a of the anchor bolt 2. Then, as shown in FIG. Here, the tightening of the center shaft 14 can be easily performed by using, for example, a small power tool such as an impact driver.

When the center shaft 14 is continuously tightened, as shown in FIG. 6A, the center shaft 14 pushes the anchor bolt 2 downward in the axial direction, and the reaction (reaction force) of the propulsive force of the center shaft 14 causes the main body portion to move. By moving the sleeve 3 and the sleeve 3 integrally upward in the axial direction, the expanded portion 3a of the sleeve 3 and the tapered portion 7 of the anchor bolt 2 are separated. By pulling up the anchor extracting tool 10, only the sleeve 3 is pulled out from the pilot hole 101 as shown in FIG. be able to.

After that, as shown in FIG. 6C, the anchor bolt 2 left in the prepared hole 101 is taken out to complete the work of removing the anchor 1. As shown in FIG. After removing the anchor 1, the attachment 110 is removed, and the pilot hole 101 formed in the concrete frame 100 is repaired using a repair material such as non-shrink mortar.

According to the method for removing the anchor 1 of this embodiment, the anchor extracting tool 10 is engaged with the groove 8 formed in the outer peripheral surface 3b of the sleeve 3 projecting from the construction surface (the surface 110a of the attachment 110). By tightening the center shaft 14 attached to the anchor extracting tool 10 and moving the sleeve 3 axially upward together with the anchor extracting tool 10 by the reaction force of pressing the anchor bolt 2 downward in the axial direction, Anchors can be easily removed. Therefore, according to the removing method of this embodiment, the anchor can be removed by a simple process of fitting the anchor extracting tool 10 into the groove 8 and tightening the center shaft 14 with an impact driver.

Moreover, according to the method for removing the anchor 1 of the present embodiment, the attachment 110 can be removed completely without leaving the anchor inside the skeleton. Therefore, it is not necessary to lift the attachment 110 to remove it from the anchor before removing the anchor. Therefore, the workability of the anchor removal work can be improved. In addition, in this embodiment, since a heavy object such as a temporary guardrail is used as the attachment 110, there is no need to lift the attachment 110 and pull it out from the anchor, so that a more remarkable effect can be obtained.

As described above, according to the anchor 1 constituting the anchor unit 20 of the present embodiment, the special washer 6 is provided so that the groove 8 of the sleeve 3 protrudes above the construction surface (the surface 110a of the attachment 110). Can be constructed in good condition. Therefore, by combining the anchor extracting tool 10, complete removal without leaving any anchor in the skeleton can be easily and reliably performed as described above. Therefore, according to the anchor unit 20 of this embodiment, it is possible to provide a high-value-added product that allows the anchor 1 to be easily removed.

An embodiment of the present invention has been described above. Change is possible. Moreover, the present invention is not limited by the embodiments.

In the anchor unit of the above-described embodiment, the case where the anchor extracting tool 10 is attached to the sleeve 3 by engaging the protrusion 12 with the groove 8 is taken as an example, but the anchor unit of the present invention is not limited to this.

FIG. 7 is a diagram showing a schematic configuration of an anchor unit according to a modification. In addition, in FIG. 7, the same reference numerals are given to the configurations common to those of the above-described embodiment, and detailed description thereof will be omitted.
As shown in FIG. 7, the anchor unit 120 of this modification includes an anchor 1A and an anchor extraction tool 10A. The sleeve 3A in the anchor 1A of this modified example has a first threaded portion 38 formed on the axially upper outer peripheral surface 3b instead of the groove portion 8 of the above-described embodiment. That is, the first threaded portion 38 is axially positioned between the lower surface 6A2 of the first portion 6A and the lower surface 6B2 of the second portion 6B. In the anchor 1</b>A of this modified example, the first threaded portion 38 formed in the sleeve 3 is completely accommodated in the recessed portion 9 of the special washer 6 .

The anchor extracting tool 10A of this modified example includes a vertically extending cylindrical body portion 41, a second threaded portion 48, and a center shaft 14. As shown in FIG. The main body portion 41 has a substantially tubular tubular portion 45 and an upper lid portion 46 provided on the upper side of the tubular portion 45 . The body portion 41 has an opening at the lower side of the cylindrical portion 45, and can accommodate a portion of the sleeve 3 therein as described later.

The second threaded portion 48 is formed on the lower end side of the inner surface 41a1 of the body portion 41 (cylindrical portion 45). The second threaded portion 48 is a screw that can be screwed into the first threaded portion 38 formed on the sleeve 3 . The center shaft 14 is attached to a female screw portion (screw portion) 46a provided so as to penetrate the upper lid portion 46 (body portion 41) in the vertical direction. The second threaded portion 48 need not be formed only on the lower end side of the inner surface 41a1, and may be formed on the entire inner surface 41a1 that can be screwed into the first threaded portion 38. FIG.

In the method of removing the anchor 1A of this modified example, the second threaded portion 48 of the anchor extracting tool 10A is screwed into the first threaded portion 38 formed on the outer peripheral surface 3b of the sleeve 3 projecting from the construction surface, and the anchor is removed. In this method, the center shaft 14 attached to the extraction tool 10A is tightened to move the sleeve 3A axially upward together with the anchor extraction tool 10A by the reaction force of pressing the anchor bolt 2 axially downward.

According to the anchor 1A that constitutes the anchor unit 120 of this modified example, the special washer 6 is provided so that the first threaded portion 38 of the sleeve 3 protrudes above the construction surface (the surface 110a of the attachment 110). can be constructed in Therefore, by combining the anchor extracting tool 10A, complete removal without leaving the anchor 1A in the skeleton can be easily and reliably performed. Therefore, according to the anchor unit 120 of this modified example, it is possible to provide a high-value-added product that allows the anchor 1A to be easily removed.

In the above-described embodiment, the case where the entire groove 8 of the sleeve 3 protrudes from the construction surface during construction of the anchor 1 was taken as an example, but the present invention is not limited to this. The groove portion 8 of the sleeve 3 only needs to protrude from the construction surface at least to such an extent that the anchor extracting tool 10 can be attached. In this case, the special washer 6 may be formed so that part of the groove 8 can be accommodated in the recess 9 .

Moreover, the shape of the special washer 6 is not limited to the shape described above. In other words, the shape of the special washer is not particularly limited as long as it has a concave portion that can accommodate the groove portion 8 of the sleeve 3 that protrudes upward from the construction surface when the anchor is constructed. That is, the shape can be appropriately changed as long as it includes a first portion that contacts the work surface and a second portion that is located above the work surface and contacts the upper end portion 3c of the sleeve 3.

Further, in the above embodiment, the case of removing the anchor 1 constructed on the attachment 110 was taken as an example, but the present invention is also applicable to a method of removing the anchor 1 constructed on the concrete skeleton 100.

1, 1A... Anchor, 2... Anchor bolt, 3, 3A... Sleeve, 3a... Expansion part, 3b... Outer peripheral surface, 3c... End part, 4... Nut, 6... Special washer (washer), 6A... First part, 6B... Second part 7... Taper part 8... Groove part 10, 10A... Anchor extracting tool 11, 41... Body part 12... Convex part 13... Notch 14... Center shaft (withdrawing bolt) , 20, 120... Anchor unit 38... First screw part 48... Second screw part 11a1, 41a1... Inner surface C... Central axis.

Claims (5)

a cylindrical sleeve extending along the central axis and having an enlarged portion on one side in the axial direction;
an anchor bolt having a tapered portion that is inserted into the sleeve and expands the expansion portion;
a nut attached to the anchor bolt;
a washer provided between the nut and the sleeve and having a first portion and a second portion;
The sleeve has an annular groove formed along the entire circumferential direction of the outer peripheral surface,
The first portion and the second portion are portions orthogonal to the axial direction, the first portion being positioned on one side in the axial direction and radially outward of the second portion,
at least part of the groove portion is located between the first portion and the second portion contacting the sleeve in the axial direction ;
In the axial direction, the end portion of the groove on the other axial side is located on the other axial side of the first portion.
anchor. An anchor extracting tool used when removing the anchor according to claim 1 from a construction surface,
a cylindrical main body;
a convex portion extending radially inward from the inner surface of the body portion and engaged with the groove portion formed in the sleeve;
a notch formed in the outer peripheral surface of the main body portion and guiding the convex portion from the radial direction to the groove portion formed in the sleeve;
an anchor extracting tool that is attached so as to pass through the main body in the axial direction and is capable of coming into contact with an end portion of the anchor bolt on the other side in the axial direction. An anchor according to claim 1;
An anchor unit, comprising: the anchor extraction tool according to claim 2 . A method for removing an anchor using the anchor unit according to claim 3 ,
After removing the nut and the washer, attaching the main body of the anchor extracting tool to the groove of the sleeve;
a step of tightening the pull- out bolt of the anchor pull-out tool to press the anchor bolt to one side in the axial direction and move the body portion to the other side in the axial direction to pull out the sleeve together with the body portion; A method for removing an anchor. An anchor is removed from the construction surface, which includes a cylindrical sleeve extending along the central axis and having an expanded portion on one side in the axial direction, and an anchor bolt inserted into the sleeve and having a tapered portion for expanding the expanded portion. a method,
With the anchor extracting tool engaged with the groove formed in the outer peripheral surface of the sleeve protruding from the construction surface, the extracting bolt attached to the anchor extracting tool is tightened to move the anchor bolt to the shaft. A method of removing an anchor, wherein the sleeve is moved to the other side in the axial direction together with the anchor extracting tool by a reaction force pressed in one direction.

Images