JP2017137726A - Post-construction anchor and installation method of installation object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a post-construction anchor capable of preventing looseness of a screw and preventing slipping-out of a bolt at low cost.SOLUTION: A post-construction anchor 1 is constituted of an interior body 2 having a female screw part 21 extending in the axial direction and an expansive opening member 3 for internally facing the interior body 2 from the tip side and expansively opening in the radial direction by relative press-in of the interior body 2, in which the female screw part 21 is formed up to a tip part 22 of the interior body 2, and a screw groove of the female screw part 21 corresponding to the tip part 22 is deformably formed, and suitably, a caulking part 23 of a crushed shape is formed in a predetermined place of the outer periphery of the tip part 22 so as to deform the screw groove of the tip part 22.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a post-construction anchor that is driven into concrete and is fixed, and more particularly to a post-construction anchor in which an interior body having a female screw is installed in an expanding member and a method for attaching an attachment using the post-construction anchor.

  2. Description of the Related Art Conventionally, as a post-construction anchor for concrete, a post-construction anchor is known in which an interior body having a female screw is installed in an expanding member. This type of post-installed anchor, unlike the male thread type anchor where the bolt protrudes outward, has the advantage that the unnecessary protruding part does not get in the way and the appearance is excellent, since the bolt does not protrude outward. A typical example is a parallel expansion anchor.

  FIG. 8 shows a state in which the parallel extension type anchor 8 is fixed to the hole 92 formed in the concrete 91 and the attachment 93 is attached. The parallel expandable anchor 8 has an internally threaded portion 82 having an internally threaded portion 82 extending in the axial direction and provided with a tapered outer peripheral surface 83 that gradually narrows toward the rear end. The expanding member 84 is provided with a tapered inner peripheral surface 85 that gradually expands toward the tip, and a slit 86 is cut along the entire length. Then, by the relative press-fitting of the taper outer peripheral surface 83 of the inner body 81 to the taper inner peripheral surface 85 of the inner body 81 by the driving of the expansion member 84, the width of the slit 86 is expanded and the expansion member 84 becomes the entire length. It spreads out almost in parallel and is frictionally fixed to the hole wall surface. A bolt 87 is screwed to the female thread portion 82 of the inner body 81 to fix the attachment 93.

  In this parallel expansion type anchor 8, since the bolt 87 is screwed into the tip of the internal thread portion 82 of the interior body 81, the expansion member 84 expands substantially parallel and is frictionally fixed to the hole wall surface. When the bolt 87 is loosened and pulled out by pressing the thick arrow, the expanding force and fixing force of the expanding member 84 are reduced. In addition, the same type of anchor (see FIG. 4) that spreads the spread piece has the same problem. Due to such problems, even if it is desired to use this type of anchor, which does not originally protrude from the bolt because the protrusion of the bolt becomes an obstacle, there are cases in which the use is postponed due to anxiety of loosening of the screw and pulling out of the bolt.

  As general screw locking prevention, as disclosed in Patent Document 1, after screwing a bolt into a nut, a method of deforming a screw groove by caulking the nut, a method of connecting both screw fastening members with a through pin, There is a method of applying an adhesive resin. However, since the female thread part of the post-installed anchor is arranged during concrete drilling, it cannot be squeezed and deformed or passed through the pin afterwards, and the method of applying adhesive resin to the thread part is adhesive resin It is uneconomical because the product cost and construction cost are separately generated.

Japanese Patent Laid-Open No. 10-205514

  Therefore, a structure that can prevent the screws from loosening and the bolts from slipping out at low cost so that the functional merit of the post-installation anchor can be used more effectively after the interior body with female threads is installed in the expansion member. After that, construction anchors are required.

  The present invention is proposed in view of the above-described problems, and is a post-installed anchor that can prevent screw loosening and bolt disengagement at a low cost in a post-installed anchor in which an interior body having an internal thread is installed in an expanding member. An object of the present invention is to provide an anchor and a method for attaching an attachment using a construction anchor.

The post-construction anchor according to the present invention includes an internal body having an internally threaded portion extending in the axial direction, and an expansion member in which the internal body is internally mounted from the distal end side and is expanded in the radial direction by relative press-fitting of the internal body. The female screw portion is formed up to the distal end portion of the interior body, and the thread groove of the female screw portion corresponding to the distal end portion is deformed and formed.
According to this, by deforming the thread groove of the female thread portion corresponding to the tip portion of the interior body, when the male screw is tightened to the tip portion, the deformed female screw is firmly engaged with the male screw of the bolt, and the screw is prevented from loosening. The bolt can be prevented from coming off. In addition, no separate material or construction such as adhesive resin is required, and the screw can be prevented from loosening and the bolt from coming off at low cost. In addition, when the male screw is tightened, the torque increases at the deformed portion of the thread groove of the female screw part, so it can be confirmed that the bolt tip has reached the tip of the interior body, and the construction management is performed easily and reliably. be able to. In addition, the tightening of the screw is only at the deformed part of the thread groove at the tip, so the tightening speed can be maintained without increasing labor during the tightening process. Efficiency can be demonstrated. In addition, the type of bolt that is screwed into the female thread is not restricted and there is no risk of loosening. For example, it can be applied to a hanging bolt that is used to hang an attachment by driving a post-installed anchor into the ceiling. And excellent in versatility.

The post-installed anchor according to the present invention is characterized in that a crimped portion having a squeezed shape is formed at a predetermined position on the outer periphery of the tip portion so that the thread groove of the tip portion is deformed.
According to this, since the deformed portion of the screw groove can be formed simply by crushing a predetermined portion of the outer periphery of the tip of the interior body by caulking, the deformed portion of the screw groove is formed by an extremely simple processing operation. be able to. In particular, in the case where caulking portions are formed at a plurality of locations apart in the circumferential direction on the outer periphery of the front end portion of the interior body, a screw that can be screwed with a male screw and can be surely prevented from loosening with a simple processing operation. A deformed portion of the groove can be formed.

The post-construction anchor of the present invention is provided with a tapered outer peripheral surface that gradually narrows toward the rear end of the interior body, and a tapered inner peripheral surface that gradually expands toward the tip of the expanding member, A slit is cut into the expanding member over its entire length, and the width of the slit is reduced by relative press-fitting of the tapered outer peripheral surface of the inner body to the inner peripheral surface of the expanding member. It spreads and the said expansion member spreads substantially parallel over the full length, It is characterized by the above-mentioned.
According to this, in order to make the most effective use of the fixing force of the parallel expansion type anchor in which the expansion member expands substantially in parallel over the entire length, the bolt reaches the tip portion and the parallel expansion is performed. Although it is important to tighten the male screw to the tip, tightening with the deformed female screw is tight, so it is possible to confirm that the operator has screwed the screw to the tip and Even if you are not skilled in discriminating the sound of hitting and response, you can maximize the fixing power of the parallel expansion anchor.

In the post-construction anchor according to the present invention, a tapered outer peripheral surface gradually narrowing toward the rear end is provided at a portion near the front end of the interior body, and the expanding piece divided by the slit is provided on the front end side of the expanding member. The expanding piece is expanded by the relative press-fitting of the expanding member of the tapered outer peripheral surface of the inner body to the expanding piece, and the female screw portion of the inner body is the inner thread portion. It is characterized by being formed only at a part near the tip of the body.
According to this, it is possible to reduce the processing cost by shortening the length of the female screw portion and to reduce the number of bolt rotations during the screw tightening operation. That is, in the construction anchor after expanding the expansion piece, if the bolt to be screwed to the female screw reaches the tip of the interior body where the loosening is prevented, and a predetermined screw fitting length is ensured Since the length of the female screw portion can be shortened, the female screw portion is shortened to reduce cost and screw tightening work.

According to the attachment method of the present invention, the first step of inserting the construction anchor into the hole formed in the concrete after the present invention is driven from the tip side, and the expanding member is driven toward the back of the hole, and the interior body is relatively A second step of expanding the expanding member by press-fitting, and screwing the male screw portion into the female screw portion of the interior body so as to insert the male screw portion of the bolt into the attachment, And a third step of screwing the male screw portion into the female screw portion until tightening is tightened at the deformed portion of the screw groove of the female screw portion.
According to this, it is possible to reliably attach the attachment to the concrete with higher construction efficiency with easy and reliable construction management.

  According to the present invention, in an after-installed anchor in which an interior body having an internal thread is embedded in an expansion member, the external thread is tightened to the distal end portion by deforming the thread groove of the internal thread portion corresponding to the distal end portion of the interior body. Thus, the deformed female screw can be firmly meshed with the male screw of the bolt, so that the screw can be prevented from loosening and the bolt can be prevented from coming off at low cost. In addition, when the male screw is tightened, the torque increases at the deformed portion of the thread groove of the female screw part, so it can be confirmed that the bolt tip has reached the tip of the interior body, and the construction management is performed easily and reliably. be able to.

(A) is a perspective view of the post-construction anchor of the first embodiment according to the present invention, (b) is a front view thereof, (c) is a right side view thereof, and (d) is a longitudinal sectional view thereof. (A) is a perspective view which shows the state after the expansion of the post-construction anchor of 1st Embodiment, (b) is the longitudinal cross-sectional view. (A)-(e) is explanatory drawing explaining the attachment process of the attachment by a construction anchor after 1st Embodiment. (A) is a perspective view of a post-construction anchor according to the second embodiment of the present invention, (b) is a front view thereof, (c) is a right side view thereof, and (d) is a longitudinal sectional view thereof. (A) is a perspective view which shows the state after the expansion of the post-construction anchor of 2nd Embodiment, (b) is the longitudinal cross-sectional view. (A)-(e) is explanatory drawing explaining the attachment process of the attachment by a construction anchor after 2nd Embodiment. (A) is a longitudinal cross-sectional view of the post-construction anchor of the third embodiment, (b) is an explanatory view showing a bolt screwed with the post-construction anchor of the third embodiment in the expanded state, and (c) is a third embodiment. Explanatory drawing which shows the state which attached the attachment to concrete with the construction anchor and the bolt of another example after a form. (A) is explanatory drawing which shows the state which attached the attachment to concrete with the conventional parallel expansion type anchor, (b) is explanatory drawing which shows the state which the volt | bolt loosened from the attachment state of the figure (a).

[Attaching method of post-construction anchor and attachment according to the first embodiment]
As shown in FIGS. 1 and 2, the post-installed anchor 1 according to the first embodiment of the present invention includes an interior body 2 having an internally threaded portion 21 extending in the axial direction, and the interior body 2 from the front end side. And an expansion member 3 that expands in the radial direction by the relative press-fitting of 2.

  The interior body 2 is a substantially cylindrical inner member integrally formed of metal. In the interior body 2, a female thread portion 21 is formed up to the distal end portion 22 of the interior body 2, and in this embodiment, the female thread portion 21 is formed over the entire length of the through hole penetrating in the axial direction of the interior body 2. Yes. The tip portion 22 of the inner body 2 is formed with a caulking portion 23 having a shape that is crushed at a predetermined location on the outer periphery so that the thread groove of the internal female screw portion 21 is deformed. In the present embodiment, the tip portion 22 is formed. The caulking portions 23 are formed at a plurality of locations apart from each other in the circumferential direction on the outer periphery of the rim, and in the illustrated example, the caulking portions 23 are formed at three locations spaced apart at substantially equal intervals in the circumferential direction. Due to the caulking portion 23, the thread groove of the female screw portion 21 corresponding to the distal end portion 22 of the interior body 2 is deformed and formed. Further, the interior body 2 is provided with a tapered outer peripheral surface 24 that gradually narrows toward the rear end, and in the present embodiment, the tapered outer peripheral surface 24 is formed over the entire rear side of the front end portion 22.

  The expansion member 3 is a substantially cylindrical outer member integrally formed of metal. The expanding member 3 is provided with a tapered inner circumferential surface 31 that gradually expands toward the tip. In this embodiment, the expanding member 3 has a tapered inner surface extending over the entire length of the through-hole penetrating in the axial direction. A peripheral surface 31 is formed. Moreover, the slit 32 is cut | disconnected over the full length in the expansion member 3, and the shape of the cross-sectional view over the full length of the expansion member 3 is a substantially C shape.

  When the post-construction anchor 1 of the first embodiment is relatively press-fitted with the taper outer peripheral surface 24 of the interior body 2 into the taper inner peripheral surface 31 of the expansion member 3 by driving the expansion member 3 as described later. The width of the slit 32 is widened, and the spreading member 3 is spread substantially parallel over the entire length. The inclination angle of the taper outer peripheral surface 24 of the interior body 2 and the inclination angle of the taper inner peripheral surface 31 of the expanding member 3 are substantially the same so that the expanding member 3 expands substantially parallel over the entire length. It is formed at an angle.

  When attaching the attachment 16 to the concrete 11 using the construction anchor 1 after the first embodiment, as shown in FIGS. 3 (a) and 3 (b), the hole 11 is formed by drilling the concrete 11 from the surface 12. After forming and cleaning the inside of the hole 13, the post-construction anchor 1 is inserted into the hole 13 from the distal end side, that is, from the side from which the interior body 2 protrudes. The depth of the hole 13 is a depth substantially corresponding to the length of the post-construction anchor 1 in the expanded state, which will be described later. At this time, a part of the expansion member 3 of the construction anchor 1 is inserted into the hole 13. It is in a state of protruding outward from the concrete surface 12.

  After that, as shown in FIG. 3C, a dedicated driving rod 14 is driven with a hammer 15 to drive the expanding member 3 toward the back of the hole, and the interior body 2 is relatively pressed into the expanding member 3 to expand. The opening member 3 is expanded. In the post-construction anchor 1 according to the present embodiment, the tapered outer peripheral surface 24 of the interior body 2 is relatively press-fitted into the tapered inner peripheral surface 31 of the expanding member 3, and the width of the slit 32 is widened, so that the expanding member 3 has a full length. It spreads substantially in parallel over the entire length of the spreading member 3 and is fixed to the wall surface of the hole 13 by friction (see the thick arrow in FIG. 3C).

  After that, as shown in FIGS. 3D and 3E, the attachment 16 is disposed on the concrete surface 12, and the washer 17 is disposed outside the attachment 16, and the male thread portion 41 of the bolt 4 is connected to the washer 17 And the attachment 16 are inserted. Then, after the male screw portion 41 inserted into the washer 17 and the attachment 16 is fixed in the hole 13, it is screwed into the female screw portion 21 of the interior body 2 of the construction anchor 1, and the female screw portion corresponding to the tip portion 22. The male screw portion 41 is screwed into the female screw portion 21 until tightening is tightened at the deformed portion of the screw groove 21. This completes the tightening of the bolt 4 and completes the attachment of the attachment 16 to the concrete surface 12 so as to be held by the washer 17 and the head 42 of the bolt 4. In this attached state, the female screw portion 21 and the male screw portion 41 are firmly engaged with each other at the deformed portion of the female screw portion 21, and the expanding member 3 is stabilized in a state of being frictionally fixed to the wall surface of the hole 13 over the entire length (FIG. 3 ( (See thick arrow in e)).

  According to the first embodiment, by deforming the thread groove of the internal thread portion 21 corresponding to the distal end portion 22 of the interior body 2, when the external thread is tightened up to the distal end portion 22, the deformed internal thread is firmly connected to the external thread of the bolt 4. As a result, the screws can be prevented from loosening and the bolts 4 can be prevented from coming off. Further, no separate material or construction such as adhesive resin is required, and it is possible to prevent the screws 4 from coming loose and the bolts 4 from coming out at low cost.

  In addition, when the male screw is tightened, the torque increases at the deformed portion of the thread groove of the female screw portion 21, so that it can be confirmed that the bolt tip has reached the tip portion 22 of the interior body 2. Management can be performed. In addition, since the tightening of the screw is tight only at the deformed portion of the thread groove of the tip portion 22, it is possible to maintain the speed of the tightening operation without increasing labor during the tightening. Construction efficiency can be demonstrated. Therefore, it is possible to reliably attach the attachment to the concrete with higher construction efficiency with easy and reliable construction management. Further, the type of the bolt that is screwed into the female screw portion 21 is not limited and there is no risk of loosening. That is, when a force in the pulling direction is applied to the interior body 2 by the bolt 4, the expanding direction applied to the expanding member 3. For example, the post-installation anchor 1 can be driven into a ceiling portion and can be applied to a suspension bolt used to suspend an attachment, and is excellent in versatility.

  Moreover, since the deformation | transformation location of a thread groove can be formed only by crushing the predetermined location of the outer periphery of the front-end | tip part 22 of the interior body 2 by caulking, forming the deformation location of a thread groove by a very simple processing operation. Can do. In particular, when the caulking portions 23 are formed at a plurality of locations apart in the circumferential direction on the outer periphery of the front end portion 22 of the interior body 2, the male screw can be screwed with a simple processing operation and the screw is securely prevented from loosening. It is possible to form a deformed portion of the screw groove that can achieve the above.

  Further, in order to most effectively exert the fixing force of the post-installed anchor 1 that is a parallel expansion type anchor that expands the entire length of the expanding member 3 substantially in parallel, the bolt 4 extends to the distal end portion 22 of the interior body 2. It is important that the expansion is performed substantially parallel, but when the male screw is tightened up to the tip 22, tightening with the deformed female screw is tightened, so the operator screwed the screw up to the tip 22. This makes it possible to reliably confirm that the fixing force of the parallel expandable anchor can be exerted to the fullest even if it is not skilled in determining the hitting sound and response at the time of driving.

[Attachment method of post-construction anchor and attachment according to the second embodiment]
As shown in FIGS. 4 and 5, the post-construction anchor 1 a according to the second embodiment of the present invention includes an interior body 5 having an internally threaded portion 51 extending in the axial direction and the interior body 5 from the front end side. 5 and an expansion member 6 that expands in the radial direction by relative press-fitting.

  The inner body 5 is a substantially cylindrical corn nut formed integrally with metal. In the interior body 5, a female thread portion 51 is formed up to the tip end portion 52 of the interior body 5. In this embodiment, the female thread portion 51 is formed over the entire length of the through hole penetrating in the axial direction of the interior body 5. Yes. A crimping portion 53 having a shape that is crushed at a predetermined position on the outer periphery so that the thread groove of the internal female thread portion 51 is deformed is formed at the distal end portion 52 of the inner body 5. In the present embodiment, the distal end portion 52 is formed. The caulking portions 53 are formed at a plurality of locations apart from each other in the circumferential direction, and in the illustrated example, the caulking portions 53 are formed at substantially equal intervals in the circumferential direction. Due to the caulking portion 53, the thread groove of the female screw portion 51 corresponding to the distal end portion 52 of the interior body 5 is deformed and formed. In addition, a tapered outer peripheral surface 54 that gradually narrows toward the rear end is provided at a portion near the front end of the interior body 5, and in this embodiment, the outer peripheral surface is tapered to a length of about 3/2 from the front end to the rear side. The outer peripheral surface 54 is partially formed, and the rear side of the tapered outer peripheral surface 54 is a cylindrical outer peripheral surface 55.

  The spreading member 6 is a substantially cylindrical sleeve integrally formed of metal. The expanding member 6 has a cylindrical main body 61 at the rear, and an expanding piece 63 divided by a slit 62 is provided on the tip side thereof. In the illustrated example, four slits 62 extending in the axial direction are formed in the circumferential direction so as to be separated from each other in the circumferential direction, and an opening 63 is formed between the slits 62 and 62. The outer peripheral surface of the spreading piece 63 is an uneven surface in which unevenness is repeated in the axial direction in order to increase the frictional force with the concrete.

  When attaching the attachment 16 to the concrete 11 using the post-construction anchor 1a of the second embodiment, as shown in FIGS. 6 (a) and 6 (b), the concrete 11 is perforated from the surface 12 to form the holes 13. After forming and cleaning the inside of the hole 13, the post-construction anchor 1a is inserted into the hole 13 from the tip side, that is, from the side from which the interior body 5 protrudes. The depth of the hole 13 is a depth that substantially corresponds to the length of the post-construction anchor 1a in the expanded state, which will be described later. At this point, a part of the expansion member 6 of the construction anchor 1a is inserted into the hole 13 at this point. It is in a state of protruding outward from the concrete surface 12.

  Thereafter, as shown in FIG. 6C, a dedicated driving rod 14 is driven with a hammer 15 to drive the expanding member 6 toward the back of the hole, and the inner body 5 is relatively press-fitted into the expanding member 6 to expand. The opening member 6 is expanded. In the post-construction anchor 1a of the present embodiment, the taper outer peripheral surface 54 of the interior body 5 is relatively press-fitted into the expansion piece 63 of the expansion member 6, and the expansion pieces 63 between the slits 62 and 62 expand, respectively. The spread piece 63 is frictionally fixed so as to bite into the wall surface of the hole 13 (see the thick arrow in FIG. 6C).

  After that, as shown in FIGS. 6D and 6E, the attachment 16 is disposed on the concrete surface 12, and the washer 17 is disposed outside the attachment 16, and the male thread portion 41 of the bolt 4 is connected to the washer 17. And the attachment 16 are inserted. Then, after the male screw portion 41 inserted into the washer 17 and the attachment 16 is fixed in the hole 13, it is screwed into the female screw portion 51 of the interior body 5 of the construction anchor 1 a, and the female screw portion corresponding to the tip portion 52. The male screw portion 41 is screwed into the female screw portion 51 until tightening is tightened at the deformed portion of the screw groove 51. This completes the tightening of the bolt 4 and completes the attachment of the attachment 16 to the concrete surface 12 so as to be held by the washer 17 and the head 42 of the bolt 4. In this attached state, the female screw portion 51 and the male screw portion 41 are firmly meshed with each other at the deformed portion of the female screw portion 51, and the expanded piece 63 is stabilized in a state where it is wedged into the wall surface of the hole 13 and frictionally fixed (FIG. 6 ( (See thick arrow in e)).

  According to the second embodiment, the structure corresponding to that of the first embodiment is low cost, can prevent the screw from loosening, and prevent the bolt 4 from coming out. It is possible to reliably attach the attachment to the surface, exhibit excellent versatility, and have a corresponding effect that the deformation portion of the screw groove can be formed by an extremely simple processing operation.

[Attachment method of post-construction anchor and attachment according to the third embodiment]
As shown in FIG. 7, the post-construction anchor 1 b according to the third embodiment of the present invention has an internal thread portion 51 b extending in the axial direction of the interior body 5 formed only at a part near the tip of the interior body 5. The rear portion 56 of the through-screw female screw portion 51b is a hole portion having a diameter larger than that of the female screw portion 51b, and the rest is the same as the post-construction anchor 1a of the second embodiment.

  When the attachment 16 is attached to the concrete 11 using the post-construction anchor 1b of the third embodiment, the attachment is basically performed in the same process as the case of using the post-construction anchor 1a of the second embodiment. In the case of using the construction anchor 1b after the configuration, it is possible to use the bolt 4m in which the male screw portion 41 is formed only at the tip portion of the shaft portion 43. Then, when the male screw portion 41 of the bolt 4m inserted into the washer 17 and the attachment 16 is fixed in the hole 13 and then screwed into the female screw portion 51b of the inner body 5 of the construction anchor 1b, the female screw portion 51b becomes the inner body. 5 is formed only at a part near the tip of the bolt 5, so that the work for screwing the male screw portion 41 and the female screw portion 51b of the bolt 4m is reduced, and the time required is shortened. In FIG. 7C, the hexagon socket countersunk bolt 4n is installed so that the head 42n is fitted to the outer surface side of the attachment 16 using a hexagon socket countersunk bolt 4n having a different shape from the bolt 4m and the head 42n. In this example, the attachment 16 is attached.

  According to the third embodiment, the same effect as that of the second embodiment can be obtained, and the length of the female screw portion 51b can be shortened to reduce the processing cost and the number of bolt rotations during the screw tightening operation. it can. Furthermore, the male screw portion 41 of the bolt 4m can be shortened, and the processing cost can be reduced in this respect.

[Modifications of Embodiment, etc.]
In addition to each invention and each embodiment, the invention disclosed in this specification is specified by changing these partial configurations to other configurations disclosed in this specification within the applicable range, or these It includes those specified by adding other configurations disclosed in this specification to the configuration, or those obtained by deleting these partial configurations to the extent that partial effects can be obtained and specifying them as a superordinate concept. The following modifications are also included.

  For example, the shape and position of deformation of the female screw portions 21 and 51 corresponding to the front end portions 22 and 52 of the interior bodies 2 and 5 are appropriate within the scope of the present invention, and the first to third embodiments described above. The form is not limited. Further, the post-installed anchor according to the present invention is appropriate within the scope of the present invention, and the parallel-expanded post-installed anchor 1 according to the first embodiment and the cone-nut type post-installed anchor according to the second and third embodiments. It is not limited to 1a and 1b. In addition, since the present invention secures the fixing force by a method of hitting the expanding member, the applicable bolt can be appropriately shaped unlike the method of securing the fixing force by bolt tightening. Moreover, the attachment attached by this invention is an appropriate | suitable thing, such as an attachment board and a connection board.

  The present invention can be used as a construction anchor after attaching an attachment such as a mounting plate or a connection plate to various concrete structures.

DESCRIPTION OF SYMBOLS 1, 1a, 1b ... Post-construction anchor 2 ... Interior body 21 ... Female thread part 22 ... Tip part 23 ... Crimp part 24 ... Tapered outer peripheral surface 3 ... Expanding member 31 ... Tapered inner peripheral surface 32 ... Slit 4, 4m ... Bolt 4n ... Hexagon socket countersunk bolt 41 ... Male thread 42, 42n ... Head 43 ... Shaft 5 ... Interior body 51, 51b ... Female thread 52 ... End part 53 ... Caulking part 54 ... Tapered outer peripheral surface 55 ... Cylinder outer peripheral surface 56 ... Rear part 6 ... Expanding member 61 ... Main body 62 ... Slit 63 ... Expanding piece 11 ... Concrete 12 ... Concrete surface 13 ... Hole 14 ... Driving rod 15 ... Hammer 16 ... Attachment 17 ... Washer 8 ... Parallel expansion type anchor 81 ... Interior Body 82 ... Female thread portion 83 ... Tapered outer peripheral surface 84 ... Expanding member 85 ... Tapered inner peripheral surface 86 ... Slit 87 ... Bolt 91 ... Concrete 92 ... Hole 93 ... Take Thing

Claims (5)

An interior body having an internally threaded portion extending in the axial direction;
The interior body is comprised from the front end side, and is composed of an expansion member that expands in the radial direction by relative press-fitting of the interior body,
The female screw portion is formed up to the tip of the interior body;
A post-construction anchor, wherein a thread groove of the female screw portion corresponding to the tip portion is formed by being deformed.   2. The post-installed anchor according to claim 1, wherein a crimped portion having a squeezed shape is formed at a predetermined position on the outer periphery of the tip portion so that the thread groove of the tip portion is deformed. The inner body is provided with a tapered outer peripheral surface that gradually narrows toward the rear end,
The expanding member is provided with a tapered inner peripheral surface gradually expanding toward the tip, and a slit is cut into the expanding member over the entire length,
By the relative press-fitting of the tapered outer peripheral surface of the inner body to the inner peripheral surface of the expanding member, the width of the slit is expanded and the expanding member expands substantially in parallel over the entire length. The post-construction anchor according to claim 1 or 2, wherein A tapered outer peripheral surface that gradually narrows toward the rear end is provided at a portion near the front end of the interior body,
A spreading piece divided by a slit is provided on the distal end side of the spreading member,
The expanding piece is expanded by relative press-fitting of the expanding member of the tapered outer peripheral surface of the interior body to the expanding piece,
The post-construction anchor according to claim 1 or 2, wherein the internal thread portion of the interior body is formed only at a part near the tip of the interior body. A first step of inserting the post-construction anchor according to any one of claims 1 to 4 from a tip side into a hole formed in concrete;
A second step of driving the expanding member toward the back of the hole and relatively press-fitting the interior body to expand the expanding member;
The male screw portion of the bolt is inserted into the attachment so that the male screw portion is screwed into the female screw portion of the interior body, and tightening is tightened at the deformed portion of the screw groove of the female screw portion. And a third step of screwing the male screw part into the female screw part.

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