JP6967307B1 - Expandable anchor removal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of easily pulling out an expandable anchor manually or by using a power driver. SOLUTION: The extraction device is fitted into a slide rod 9 in which a relay member 7 screwed into a female screw 2 of an anchor 1 is separately or integrally provided, and a slide rod 9 which cannot rotate relative to the slide rod 9 and is slidably relative to the slide rod 9. It includes a holder 10 and a tubular nut 11 (thrust rotating body) that is screwed into an exposed portion of a slide rod 9 while being held rotatably and non-slideable by the holder 10. When the tubular nut 11 is rotated by the power driver, the slide rod 9 retracts and the anchor 1 is pulled out. When the anchor 1 is a ball expansion type, it can be particularly easily removed by loosening or removing the inner bolt 4 that presses the ball in the previous step. [Selection diagram] Fig. 2

Description

The present invention relates to a removal device for pulling out an expandable anchor provided with an expansion member such as a ball from a construction site.

Expandable anchors are used to secure members to stony construction parts such as concrete and brick. This anchor has a type in which a pin is struck to expand the expansion portion by a tapered cone, and as disclosed in Patent Document 1, a large number of balls arranged inside are pressed by an inner bolt to inflate. The latter type has the advantage that the burden on the operator can be significantly reduced because it is not necessary to swing the hammer around.

In either type, the anchor may have to be removed from the construction section after the member has been removed. Therefore, an anchor removing device in which a female screw is formed and the work is fixed with a bolt has been proposed. For example, in Patent Documents 2 and 3, a holder (color) and a bolt screwed to the holder (collar) are provided. The extraction device to have is disclosed.

That is, in Patent Documents 2 and 3, the bolt has a head and the nut is screwed on the outside of the holder. By rotating with, the bolt is moved in the axial direction and the anchor is pulled out.

Republished WO 2016/121993 CD-ROM of Jitsukaihei 7-14000 Japanese Unexamined Patent Publication No. 7-48834

In Patent Documents 2 and 3, since a large torque can be applied to the nut, the anchor can be pulled out accurately by removing the extension of the anchor to weaken the tension against the prepared hole. Unless it is a manual spanner, it cannot be rotated and a power driver such as an electric driver cannot be used. Therefore, there is a problem that workability is poor and the burden on the operator is heavy.

The present invention has been made to improve such a situation, and an object of the present invention is to provide a device capable of easily pulling out an anchor by using a power driver or the like.

The expandable anchor used for concrete etc. has a female screw that is exposed to the outside of the construction part while being embedded in the pilot hole of the construction part as a whole, and the work is fixed to the construction surface by the bolt screwed into the female screw. There are two types, one is a female screw type and the other is a male screw type that has a male screw portion protruding from the construction surface and the work is fixed with a nut.

As the expansion means, a driving type pin is often used in the female thread type, and a pilot hole arrangement type taper pin as disclosed in Patent Documents 2 and 3 is used in the male thread type. On the other hand, Patent Document 1 discloses that the female thread type and the male thread type are expanded by using a ball and an inner bolt. Therefore, as the anchor of the male thread type, there are an anchor having a female thread, an anchor having a simple hollow hole, and an anchor having no hollow hole.

The invention of the present application includes various configurations, and a typical example thereof is specified in each claim. The invention of claim 1 is used for extracting a female screw type anchor, and this device is used.
"A slide rod in which a relay member screwed into the female screw of the anchor is provided separately or integrally.
A holder that cannot rotate relative to the slide rod attached to the anchor and is fitted so that it can be slid relative to each other.
The holder is provided with a thrust rotating body that is directly or indirectly screwed with the slide rod while being held rotatably and non-slideably.
The rotation of the thrust rotating body causes the slide rod to be retracted so as to be separated from the construction portion. "
It is configured as.

On the other hand, the invention of claim 2 is used for extracting a male screw type anchor, and this device is used.
"A slide rod provided with a female screw formed on the anchor or a relay member screwed into the male screw portion separately or integrally.
The holder is provided with a thrust rotating body that is directly or indirectly screwed with the slide rod while being held rotatably and non-slideably.
The rotation of the thrust rotating body causes the slide rod to be retracted so as to be separated from the construction portion. "
It is configured as.

The invention of claim 3 is claimed in claim 1 or 2.
"The slide rod is basically a circular bolt, at least partly formed in an oval cross section or other non-circular part, and is set so that a part protrudes from the outside of the holder. On the other hand
The holder is formed with an engaging hole in which the non-circular portion of the slide rod is non-rotatable and can be slidably fitted.
Further, the thrust rotating body is a cylindrical nut that is rotationally operated by a power driver or a manual wrench. "
It is configured as.

In claim 3, in order to prevent biting and seizure when tightening the tubular nut and allow smooth rotation, a thrust type bearing or a ring-shaped slider is used between the holder and the tubular nut. It is preferable to interpose a suitable rotation smoothing member.

The invention of claim 4 is in any one of claims 1 to 3.
"The holder is sized to be grasped by a general adult, and a hollow portion is formed inside, and the hollow portion opens to a part of the outer peripheral surface through a window hole."
It is configured as.

In the present invention, the holder can also be specified by words such as case, housing, and collar. The same applies to the slide rod, which can be specified by words such as a slide shaft, an operating shaft, and a puller.

In each invention of the present application, the anchor is removed by removing or reducing the tension of the anchor against the prepared hole by removing the expansion member from the anchor, screwing the relay member into the anchor, and attaching the holder to the slide rod to which the relay member is attached. It can be fitted, and the slide rod can be retracted by rotating the thrust rotating body with the other hand while holding the holder non-rotatably with one hand.

Further, in the present invention, since the thrust rotating body can be rotated by a power driver such as an electric driver, the anchor can be pulled out quickly and with almost no force. Therefore, the work efficiency can be remarkably improved, and the burden on the worker can be remarkably reduced.

When configured as in claim 3, the slide rod and the holder are directly slidable and non-rotatably fitted, and the tubular nut is directly screwed to the slide rod, so that the number of members is reduced and the structure is simplified. It can also contribute to cost reduction.

In order for the operator to hold the holder non-rotatably, the holder needs to have a certain size, but if a hollow portion is formed in the holder as in claim 4, the holder is made as light as possible and the required size. Can be set to. Therefore, it is user-friendly.

In addition, since the holder has a window hole, the holder can be accurately fitted into the slide rod. In particular, when the slide rod is formed in a non-circular shape such as an oval shape as in claim 3, it is necessary to align the posture of the holder and the slide rod, but when the holder has a window hole, the window hole is formed. Since the posture of the slide rod can be visually recognized via the holder, the holder can be quickly fitted, which is suitable.

When using the device of the present application, it is preferable to remove the inner bolt and the driving pin in advance to release or reduce the tension of the anchor against the prepared hole. However, as in Patent Document 1, the ball is used as an expansion member. When the inner bolt is used, the tensioning force of the expansion portion with respect to the prepared hole can be significantly reduced by a simple operation of unscrewing the inner bolt, so that it can be said that the true value of the expansion anchor extraction device of the present invention is strongly exhibited. Conversely, the apparatus of the present invention ensures the advantage of the ball expandable anchor that it is easy to pull out. However, when the tensioning force of the anchor with respect to the prepared hole is low, it is possible to forcibly pull out the anchor while leaving the expansion member as it is.

Further, since the thrust rotating body is exposed on the outside of the slide rod, by providing the driver bit engaging portion on the thrust rotating body, the thrust rotating body can be lightly rotated by a power driver or the like.

In female screw type anchors, the work is often fixed to the construction surface with bolts screwed into the female screw, but it is used for mounting bolts that do not have a work fixing function, such as hanging bolts and hook bolts. There is also.

It is a figure which shows the 1st Embodiment, (A) is the separation perspective view, (B) is the BB visual cross-sectional view of (A). It is a figure which shows the extraction process, (A) is a figure which shows the pre-process, (B) is a figure which shows the state of pulling out. It is a figure which shows the pulling out state of a male thread type anchor, (A) is a figure which shows the pre-process, (B) is a figure which shows the state of pulling out.

(1). Structure of Embodiment Next, an embodiment of the present invention will be described. In the following, the upper and lower words are used for convenience to specify the direction, but this wording is used assuming that the anchor driven into the floor is pulled out (the anchor placed on the ceiling is pulled out). When used for, the top and bottom are turned upside down, and when used for pulling out anchors placed on the wall, the top and bottom change to the left and right.)

First, the first embodiment shown in FIGS. 1 and 2 will be described. This embodiment is used for extracting an anchor 1 having a female screw, and as shown only partially in FIG. 2A, the anchor 1 includes a main body 3 which is cylindrical and has a female screw 2 formed inside. An expansion portion (not shown) is formed in the main body 3, and the expansion portion is spread through a group of balls (not shown).

Therefore, an inner bolt (insect screw) 4 that presses the group of balls toward the tip of the main body 3 is screwed into the female screw 2. Therefore, when the inner bolt 4 is pulled out, the tensioning force of the extended portion with respect to the prepared hole 6 of the construction portion 5 is significantly reduced, and the inner bolt 4 can be easily pulled out.

The extraction device includes a bolt-type relay member 7 that can be screwed into the female screw 2 of the anchor 1, a slide rod 9 having a tap hole 8 into which the relay member 7 is screwed into the lower end surface (one end surface), and a slide rod 9 above the slide rod 9. A holder 10 that cannot rotate relative to each other and can be slidably fitted relative to each other, a tubular nut 11 screwed into the slide rod 9 from above the holder 10, and a thrust bearing interposed between the holder 10 and the tubular nut 11. It is equipped with twelve. Although the relay member 7 is configured separately from the slide rod 9, the relay member 7 can be integrally formed with the slide rod 9 as shown by the alternate long and short dash line in FIG. 1 (A).

The slide rod 9 is basically a double-sided bolt without a head, and is formed in a non-circular cross section over the entire length by forming a pair of flat surfaces 9a over the entire length. On the other hand, the holder 10 is a circular shape having a flange 10a formed at the lower end (one end overlapping the construction portion 5), a hollow portion 13 having a downward opening is formed inside, and a window hole 14 is formed in a part of the outer periphery. Is formed.

Further, in the top plate portion of the holder 10 located above the hollow portion 13, there is an oval-shaped engaging hole 15 that fits the slide rod 9 in a relative slidable manner without being able to rotate relative to the slide rod 9. The window hole 14 of the embodiment is opened in a direction parallel to the longitudinal axis of the engagement hole 15. Therefore, when the holder 10 is fitted into the slide rod 9, the male screw portion 16 of the slide rod 9 can be visually recognized from the window hole 14. Therefore, the posture of the holder 10 can be adjusted quickly. The window holes 14 may be formed on both sides of the axis. The holder 10 has an outer diameter of, for example, about 50 mm, and is set to an outer diameter that can be firmly grasped by a general adult.

In the present embodiment, the male screw portion 16 is formed on the outer periphery of the slide rod 9 over the entire length, but it is sufficient if the male screw portion 16 is formed so as to be exposed above the holder 10 during the pulling operation. The same applies to the flat surface 9a, and the portion below the portion that slides up and down with the holder 10 may remain circular. The tubular nut 11 is an example of the thrust rotating body according to the claim, and a tap hole 17 that can be screwed from above into the slide rod 9 is opened at the lower end thereof.

On the other hand, at the upper end of the tubular nut 11, a bit hole 19 into which a hexagonal driver bit 18 is fitted is formed as a bit engaging portion. The driver bit 18 may be a socket type. In this case, a boss portion such as a hexagon may be integrally formed on the upper surface of the tubular nut 11 as a bit engaging portion.

(2). Extraction step Since the anchor 1 of the present embodiment is a bolt expansion type, first, as shown in FIG. 2A, the inner bolt 4 is extracted using a square wrench 20. Next, the relay member 7 is screwed into the female screw 2 of the anchor 1 to an appropriate depth, and then the slide rod 9 is screwed into the relay member 7. The slide rod 9 is preferably screwed in until it hits the surface of the construction portion 5.

Next, the slide rod 9 protruding from the surface of the construction portion 5 is fitted so as to cover the holder 10. That is, the engaging hole 15 of the holder 10 is fitted into the slide rod 9 from above, and the holder 10 is placed on the surface of the construction portion 5. As a result, the slide rod 9 and the holder 10 are relatively non-rotatable and relatively slidable.

The slide rod 9 is set to a length in which the upper portion is exposed above the holder 10 with the holder 10 fitted, and the thrust bearing 12 is first fitted to the upward exposed portion of the slide rod 9 and then one hand. With the holder 10 gripped by the above, the tubular nut 11 is screwed into the upward exposed portion of the slide rod 9 into the power driver. Then, since the slide rod 9 is held so as not to rotate, when the tubular nut 11 hits the thrust bearing 12, the slide rod 9 is pulled upward by the rotation of the tubular nut 11, whereby the anchor 1 also faces upward. It will be overtaken by.

In this case, since the holder 10 has an outer diameter that can be firmly grasped by a person, the tubular nut 11 can be screwed into the slide rod 9 while the holder 10 is held non-rotatably. Therefore, the extraction of the anchor 1 can be ensured.

In the above description, the inner bolt 4 was removed in the previous step, but if the female screw 2 has a sufficient depth to screw the relay member 7 in the state where the inner bolt 4 is loosened, the inner bolt 4 is used. Can be left unremoved by simply loosening it. Further, since the anchor 1 may be pulled out by hand when it is pulled up to a certain extent, it is not always necessary to rotate the tubular nut 11 until the anchor 1 is separated from the construction portion 5.

The length of the anchor 1 varies, but as a means for dealing with the difference in length, by setting the tubular nut 11 to a length corresponding to the longest length, one tubular shape can be obtained. The nut 11 may be compatible with all types of anchors 1, or a plurality of types of tubular nuts 11 having different lengths may be prepared.

There may be a plurality of types of anchors 1 having different outer diameters and diameters of the female threads 2, but in this case, it is necessary to prepare a plurality of types of relay members 7 corresponding to the diameters of the female threads 2. By forming tap holes 8 having different diameters at one end and the other end of the slide rod 9, it is possible to make one slide rod 9 correspond to two types of relay members 7. Alternatively, the relay member 7 can be slid by manufacturing a plurality of types corresponding to the type of the female screw 2 of the anchor 1 and setting the portion of each relay member 7 to be screwed to the slide rod 9 to the same diameter. It is also possible to use only one type of rod 9, holder 10, and tubular nut 11.

As shown by the alternate long and short dash line in FIG. 1A, it is also possible to use a high nut (long nut) 11a as a thrust rotating body and rotate it with a socket wrench 18a. Since high nuts 11a having different lengths are commercially available, those having an appropriate length can be easily obtained. On the other hand, as shown by the dotted line in FIG. 2B, a square nut 11b such as a hexagon nut is used as a thrust rotating body, and the square nut 11b is rotated by a long socket wrench (not shown). It is also possible.

(3). Application to male screw type anchors Fig. 3 shows the state used for extracting the male screw type anchor 1. In this example, the anchor 1 is provided with a male screw portion 21 exposed from the surface of the construction portion 5, and a female screw 2 into which the inner bolt 4 is screwed is formed. Therefore, the anchor 1 is a type in which the ball is pressed by the inner bolt 4 to expand the diameter of the expanded portion of the main body 3.

As described above, in the case of the anchor 1 in which the female screw 2 is formed even if it is a male screw type, the above-mentioned device can be used as it is, but the slide rod 9 is the surface of the construction portion 5 by the exposed dimension of the male screw portion 21. If the slide rod 9 of FIGS. 1 and 2 is used as it is, the pulling stroke of the anchor 1 becomes short. Therefore, when used for the male screw type anchor 1, a slide rod 9 shorter than the female screw type anchor 1 may be used. Of course, if the tubular nut 11 is sufficiently long, a slide rod 9 having the same length can be used for both the female thread type anchor and the male thread type anchor 1.

When the male screw type anchor 1 has no female screw 2 formed, the relay member 7 is screwed to the male screw portion 21 of the anchor 1 with the nut portion 22 as shown by the alternate long and short dash line in FIG. 3 (B). It can be dealt with by forming the slide rod 9 into a form having a bolt portion 23 screwed into the tap hole 8 (a form having a different diameter). Alternatively, it is also possible to integrally form the nut portion 22 screwed with the male screw portion 21 of the anchor 1 on the slide rod 9.

Although the embodiments of the present invention have been described above, the present invention can be developed in various ways. For example, the holder may be a quadrangle, a hexagon, or the like. Further, as a means for preventing relative rotation between the slide rod 9 and the holder 10, various combinations such as forming a key groove in the slide rod 9 and forming a ridge in the engaging hole of the holder 10 can be adopted.

Further, the slide rod does not have to be a bolt type having a male screw formed on the outer circumference. For example, while the slide rod is formed into a square cross section such as a hexagon, the holder is formed with a square engaging hole in which the slide rod is slidable and cannot rotate relative to each other, and the upper end of the slide rod is inserted into the engaging hole. Positioned inside, the headed bolt can be pulled up (retracted) by the rotational operation of the headed bolt by screwing the headed bolt into the slide rod from above via the thrust bearing. In this case, the headed bolt becomes the thrust rotating body described in the claims.

Further, the tubular nut and the headed bolt, which are examples of the thrust rotating body, can be rotated by a wrench having a long handle such as a socket wrench or a box wrench. In this case, a large torque can be applied to a thrust rotating body such as a tubular nut or a bolt with a head. It is also possible to attach a non-rotating handle to the holder. As the rotation smoothing means, a ring-shaped slider made of a hard material having a small coefficient of friction can also be used.

The present invention can be embodied in an expandable anchor removal device. Therefore, it can be used industrially.

1 Anchor 2 Female screw 3 Anchor body 4 Inner bolt that forms part of the expansion member 5 Construction part 6 Pilot hole 7 Relay member 8 Tap hole 9 Slide rod 10 Holder 11 Cylindrical nut as an example of thrust rotating body 12 Rotation smoothing Bearing as an example of a member 13 Hollow part 14 Window hole 15 Engagement hole 16 Male thread part 17 Tap hole 18 Driver bit 21 Male thread part

Claims (4)

It is a device for pulling out an anchor that is fixed to a pilot hole made in the construction part by an expansion action and has a female screw opening outward from the construction part.
A slide rod in which a relay member screwed into the female screw of the anchor is provided separately or integrally.
A holder that cannot rotate relative to the slide rod attached to the anchor and is fitted so that it can be slid relative to each other.
The holder is provided with a thrust rotating body that is directly or indirectly screwed with the slide rod while being held rotatably and non-slideably.
The slide rod is retracted so as to be separated from the construction portion by the rotation of the thrust rotating body.
Expandable anchor removal device. It is a device for pulling out an anchor having a male threaded portion exposed from the construction portion while being fixed to a prepared hole made in the construction portion by an expansion action.
A slide rod provided with a female screw formed on the anchor or a relay member screwed into the male screw portion separately or integrally.
A holder that cannot rotate relative to the slide rod attached to the anchor and is fitted so that it can be slid relative to each other.
The holder is provided with a thrust rotating body that is directly or indirectly screwed with the slide rod while being held rotatably and non-slideably.
The slide rod is retracted so as to be separated from the construction portion by the rotation of the thrust rotating body.
Expandable anchor removal device. The slide rod is basically a circular bolt, at least a part of which is formed in an oval cross section or other non-circular part, and a part of the slide rod is set so as to protrude from the outside of the holder. On the other hand,
The holder is formed with an engaging hole in which the non-circular portion of the slide rod is non-rotatable and can be slidably fitted.
Further, the thrust rotating body is a tubular nut that is rotationally operated by a power driver or a manual wrench.
The expandable anchor removing device according to claim 1 or 2. The holder has a size that can be grasped by a general adult, and a hollow portion is formed inside, and the hollow portion opens to a part of the outer peripheral surface through a window hole.
The expandable anchor removing device according to any one of claims 1 to 3.

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