JP2014025244A - Positioning tool for anchor-bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an anchor-bolt to be accurately positioned at a center position of an embedment hole and to prevent an adhesive from dripping-off from an upward embedment hole, the anchor-bolt being such a type as to be inserted into the embedment hole in a structure and fixed to the structure by hardening the adhesive filled in a clearance between the embedment hole and the anchor-bolt.SOLUTION: A positioning tool 10 which can be mounted on an anchor-bolt comprises a cylindrical body 11 and a plurality of protrusions 12 connected to outer peripheral surface of the body 11 and having nearly the same protrusion amount in the radial direction. When the anchor-bolt 20 mounted with the positioning tool 10 is inserted into an embedment hole 41 of a structure 40, apexes of the respective protrusions 12 abut on the inner surface of the embedment hole 41, and thus the anchor-bolt 20 is accurately positioned at a center position of an embedment hole 41. When the embedment hole 41 is upward directed, the respective protrusions 12 are hooked to the inner surface of the embedment hole 41 or stuck in an adhesive filled in the hole, which generates resistance against falling. Thereby, the anchor-bolt 20 is prevented from dropping down.

Description

  The present invention relates to a positioning tool for mounting on an anchor bolt, an assembly of an anchor bolt formed by mounting and fixing the positioning tool to the anchor bolt, and an anchor bolt structure using the assembly of the anchor bolt. It relates to the fixing method.

  As in Patent Document 1, a hole is drilled in a structure (base material) using a drill or the like, an anchor bolt is inserted into the hole, and an epoxy resin adhesive or the like filled in the hole is bonded. The anchor bolt is often fixed to the structure by curing the agent.

When this type of anchor bolt is used, the hole diameter of the embedded hole formed in the structure is set larger than the diameter of the anchor bolt to be inserted so that the adhesive can be sufficiently filled. .
Therefore, as shown in FIG. 6, a relatively large gap is formed between the embedded hole 41 of the structure 40 and the anchor bolt 20 inserted therein, and the anchor bolt 20 is inserted into the embedded hole. In 41, it may happen that it is biased or tilted.
For example, when the embedding hole is formed in the horizontal direction (lateral direction), the inserted anchor bolt is biased downward due to its own weight.

In this way, if the anchor bolt is fixed in a state where it is biased or inclined in the embedded hole, there is a possibility that an abnormality may occur in the strength of the building. It is necessary to accurately position to the position.
Therefore, conventionally, a special jig using a magnet or the like has been set in the embedding hole, and an attempt has been made to position the anchor bolt at the center position by the magnetic force.

  However, it is troublesome and costly to prepare such a special jig separately and perform the anchor bolt positioning operation at the construction site.

In addition to this problem, when the embedded hole is formed upward, the anchor bolt inserted into the embedded hole gradually descends due to its own weight until the adhesive hardens during construction. There was a problem of so-called dripping.
In this case, a desired embedding length cannot be ensured in the anchor bolt fixed to the structure, and the strength is lowered.
Therefore, as shown in FIG. 7, a separate wedge W is prepared, and an attempt is made to prevent dripping of the anchor bolt 20 by biting the wedge W near the opening of the embedded hole 41 of the structure 40. There is a problem that it takes time to install the wedge W at the construction site.

JP 2004-11345 A

  Therefore, the problem to be solved by the present invention is that an anchor bolt that is fixed to the structure by being inserted into the embedded hole of the structure and curing the adhesive filled in the gap with the embedded hole is embedded. The accurate positioning of the hole to the center position and the prevention of dripping from the upward embedded hole are easily realized.

  In order to solve the above-described problems, a positioning tool that can be attached to the anchor bolt is newly developed, and this is provided with a cylindrical main body that can be externally fitted to the anchor bolt, and an outer peripheral surface of the main body that is spaced in the circumferential direction. And a plurality of protrusions that are continuously provided and have substantially the same amount of protrusion in the radial direction of the main body.

An embedded hole having a diameter substantially the same as the virtual circle connecting the vertices of the protrusions of the positioning tool is formed in the structure, and when the anchor bolt with the positioning tool attached is inserted therein, the vertices of the protrusions of the positioning tool are Abutting or very close to the inner surface of the hole.
The protrusion of each protrusion from the main body is approximately equal, and the distance from the center of the anchor bolt to the apex of each protrusion that contacts the hole inner surface of the embedded hole is approximately equal. Will be positioned accurately.

  If the anchor bolt with the positioning tool attached is inserted when the embedded hole is facing upward, each protrusion will be caught by the inner surface of the embedded hole, or the adhesive filled in the embedded hole will be entangled and lowered. The anchor bolt is prevented from dripping by becoming resistance to.

  Positioning to the center and prevention of dripping as described above can be realized at the same time by simply mounting a positioning tool having a simple structure comprising a main body and a protrusion on the anchor bolt.

It is preferable that the main body and the protrusion are integrally formed of a synthetic resin because it can be manufactured easily and at low cost.
The main body is made of rubber and has elasticity, and is attached to the anchor bolt by being elastically expanded in diameter and then being attached to the anchor bolt by reducing the diameter by restoring elasticity. And it is preferable because it is difficult to come off from the anchor bolt.

It is preferable that the protrusion has a wedge surface inclined toward the axial direction of the main body on the outer diameter side.
When the anchor bolt is attached so that the inclined lower end portion of the wedge surface is located closer to the tip end side of the anchor bolt than the inclined upper end portion and is inserted into the upward embedding hole formed in the structure, the wedge surface is embedded. By biting into the inner surface of the hole, the anchor bolt is further prevented from dripping.

  An anchor bolt, a positioning tool mounted in parallel with two or more in the axial direction of the anchor bolt, and a coating film formed by applying and curing a coating material on the anchor bolt after the positioning tool is mounted An assembly of anchor bolts is preferably constructed from the layers.

If the assembly is completed in advance and then transported to the construction site in this state, the labor of mounting the positioning tool on the anchor bolt at the construction site can be saved.
In addition, the coating layer prevents rusting of the anchor bolt, and the positioning tool is firmly fixed to the anchor bolt by the coating layer, so that a displacement movement or drop-off with respect to the anchor bolt is prevented.
In the embedding hole, the anchor bolt is supported by at least two points on the front and back by a plurality of positioning tools, so that it is reliably prevented from inclining in the axial direction.

  The anchor bolt fixing method using this assembly includes a step of drilling an embedded hole having a diameter substantially the same as a virtual circle formed by connecting the apexes of the protrusions of the positioning tool to the structure, and an acrylic in the embedded hole. A step of injecting a resin-based adhesive, a step of inserting the assembly into the embedded hole after the injection of the acrylic resin-based adhesive while rotating the assembly around its axis, and a curing until the acrylic resin-based adhesive is cured A process comprising the steps of:

  When the assembly is rotated and inserted into the embedded hole into which the adhesive has been injected, the adhesive is stirred into the protrusion of the positioning tool, etc., so that the gap between the embedded hole and the anchor bolt is uniformly filled. Fixing reliability is improved.

The acrylic resin adhesive used in the present invention is higher in viscosity and shorter in curing time than the epoxy resin adhesive widely used in the conventional so-called injection method, so even when the embedded hole is upward or sideways, It is difficult for the adhesive to flow out of the hole, and construction is easy.
Moreover, the adhesiveness to wet surfaces, such as the surface wetted with water, is also favorable. In addition, when the acrylic resin adhesive is a two-component mixed adhesive consisting of a main agent and a curing agent, it is not necessary to strictly observe the mixing ratio of the two components, and the adhesive property can be maintained even in a rough mixed state. Is good.
It is excellent in chemical resistance and durability, has low irritation to the skin, does not contain so-called environmental hormones, and does not generate toxic gas during combustion, so it has good safety. Since the filling property is also excellent, the hole diameter of the embedded hole can be reduced.

  Since the present invention is configured as described above, positioning of the anchor bolt to the center position of the embedded hole and prevention of dripping from the upward embedded hole can be easily realized.

(A) of the positioning tool of embodiment is a perspective view, (b) is a front view The side view which shows the manufacturing process of the assembly | attachment body of embodiment. Each process figure of the fixing method to the structure of the anchor bolt of embodiment Each process figure of the fixing method to the structure of the anchor bolt of embodiment (A) which shows the positional relationship of a buried hole and an anchor bolt, (a) is a side view, (b) is sectional drawing of the arrow of (a) (A) which shows the other example of the positioning tool of embodiment is a side view which shows the state with which the anchor bolt was mounted | worn, (b) is a principal part enlarged view of (a), (c) is a perspective view. (A) at the time of construction of a conventional anchor bolt is a side view, (b) is an arrow sectional view of (a) Side view of conventional anchor bolt when installed in upward hole

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The anchor bolt positioning tool 10 of the embodiment shown in FIG. 1 is used by being attached to an anchor bolt 20 as shown in FIG. As shown in FIG. 3, when the anchor bolt 20 is inserted into the embedded hole 41 of the structure 40, the anchor bolt 20 is accurately positioned to the center position of the embedded hole 41 as shown in FIG.
Further, as shown in FIG. 5, when the embedded hole 41 is formed upward with respect to the structure 40, it is also for preventing the anchor bolt 20 inserted therein from drooping due to its own weight.

A positioning tool 10 according to the embodiment shown in FIG. 1 includes a main body 11 and three protrusions 12 integrally connected to the outside of the main body 11.
The main body 11 has a cylindrical shape, and the length of the cylinder in the axial direction is very short, and is set to be sufficiently shorter than the length of the general anchor bolt 20 in the axial direction.
As shown in FIG. 1B, an anchor bolt 20 can be inserted into the ring of the main body 11.
Each protrusion 12 has a semi-cylindrical shape, and three protrusions 12 are connected to the outer peripheral surface of the main body 11 at equal intervals. The diameters of the semicircular cylinders of the protrusions 12 are equal, and therefore, the protrusion amount of the protrusion 12 from the main body 11 is equal.
Moreover, the axial direction of the semi-column of this protrusion 12 and the axial direction of the cylinder of the main body 11 are the same, and the length of both axial direction is equal.
The height of the protrusion 12 is not particularly limited, but is usually about 1 to 3 mm.

The material of the main body 11 and the protrusion 12 is not particularly limited and may be made of metal or the like, but it is preferable that both are made of synthetic resin from the viewpoint of cost, moldability, and the like. Further, the main body 11 and the protrusion 12 may be molded separately and then fixed, but it is easy to integrally mold them using a mold or the like.
The type of the synthetic resin is not particularly limited, but fiber reinforced plastic (FRP) is exemplified when it is desired to give strength to the positioning tool 10, and synthetic rubber is exemplified when it is desired that the positioning tool be provided with appropriate elasticity. it can.
Further, when these materials are made of metal, the protrusions 12 can be formed by cutting and raising from the main body 11. The main body 11 and the protrusion 12 may be made of different materials such that one is made of metal and the other is made of resin.

The number, shape, etc. of the protrusions 12 are not limited to this embodiment. For example, the number of protrusions 12 is two or four or more, the shape is hemispherical or prismatic, or provided at irregular intervals. Also good.
The axial direction and the axial length of the main body 11 and the protrusion 12 do not have to be the same as in the embodiment. For example, the axial length of the protrusion 12 is smaller than the axial length of the main body 11. Alternatively, the axis of the protrusion 12 may be inclined with respect to the axis of the main body 11.

The anchor bolt assembly of the embodiment shown in FIG. 2 includes a plurality of positioning tools 10, anchor bolts 20, and a coating layer 30.
As the anchor bolt 20, a known anchor bolt of the type inserted into the embedded hole 41 of the structure 40 and fixed by the adhesive 60 filled in the embedded hole 41 as shown in FIG. 3 is used. .

As shown in FIG. 2A, the two positioning tools 10 are mounted in parallel in the front-rear direction in the axial direction of the anchor bolt 20.
The inner diameter of the main body 11 of the positioning tool 10 is set to be approximately the same as the diameter of the anchor bolt 20. However, when the positioning tool 10 is made of synthetic rubber and has elasticity, the inner diameter of the main body 11 is anchored. It may be set slightly smaller than the diameter of the bolt.
In this way, when the positioning tool 10 has elasticity and the inner diameter of the main body is small, when the anchor bolt 20 is mounted, the main body 11 is expanded and expanded to cover the anchor bolt 20, and then restored by elasticity. If it does, it will be in the state closely_contact | adhered to the anchor bolt 20, and will become difficult to remove | deviate.

As shown in FIG. 2B, the coating layer 30 is formed by applying a coating from the anchor bolt 20 on which the positioning tool 10 is mounted and curing.
In the assembled body, the coating layer 30 is formed only within a predetermined range corresponding to the set embedding length from the tip of the anchor bolt 20, and on the rear end side of the anchor bolt 20, The background is exposed.
As a paint for forming such a coating layer 30, a known paint is used.
Since the coating layer 30 covers the surface of the anchor bolt 20, rusting of the anchor bolt 20 is prevented. If the paint contains a rust inhibitor, rusting of the anchor bolt 20 is further prevented. An example of such a paint is “Anti-rust acrylic coating BF3-86” manufactured by Tanimura.
The coating layer 30 also serves to fix the positioning tool 10 to the anchor bolt 20. As a result, the positioning tool 10 is reliably prevented from shifting or dropping with respect to the anchor bolt 20.
Furthermore, since the coating film layer 30 is formed by the length corresponding to the set embedding length of the anchor bolt 20, the anchor bolt is applied during construction because of the difference in the color tone of the coating film layer 30 and the anchor bolt 20. It is possible to easily confirm visually whether or not the embedment length set to 20 is normally embedded.

As shown in FIG. 2 (c), the anchor bolt assembly is transported to a construction site after being packed with a packing material F such as a plastic bag in order to prevent damage.
If it does in this way, it will not be necessary to perform the mounting | wearing operation | work etc. of the positioning tool 10 to the anchor bolt 20 again at a construction site, and it will not take an effort.

  The configuration of the positioning tool 10 and the assembly of the embodiment is as described above. Next, a method for fixing the anchor bolt to the structure of the embodiment will be described with reference to FIG.

First, as shown in FIG. 3A (a), the embedded hole 41 is drilled in the structure 40 using a drill D or the like. Here, the hole diameter of the embedding hole 41 is set to be approximately equal to the diameter of a virtual circle connecting the vertices of the protrusions 12 of the positioning tool 10 in a state of being mounted on the anchor bolt 20.
Next, as shown in FIG. 3A (b), it is preferable to dry the interior of the embedded hole 41 after perforation using a blower B or the like to remove shavings remaining in the interior.

Further, as shown in FIG. 3A (c), an injection machine 50 for injecting an adhesive into the embedded hole 41 is prepared. As shown in the figure, the injector 50 includes a nozzle 51 for discharging the adhesive, a syringe 52 in which the adhesive is accommodated, and a gun 53 that pushes the adhesive in the syringe 52 toward the nozzle 51. .
The nozzle 51 has a spiral groove formed therein, and its rear end is connected to the mouth of the syringe 52.
Here, an injection machine 50 used for a so-called two-component mixed type adhesive is shown, and the syringe 52 has a structure in which chambers for storing two components, such as a main agent and a curing agent, are arranged in parallel. Yes.
Further, a known gun 53 is used.

As shown in FIG. 3B (d), the adhesive 60 is filled into the embedded hole 41 of the structure 40 using the injector 50.
The type of the adhesive 60 is not particularly limited, and an epoxy resin-based adhesive may be considered, but an acrylic resin-based adhesive is preferable because of a short curing time. As the acrylic resin adhesive, a known two-component mixed type is used. An example of such an acrylic resin adhesive is Hard Rock II “Metacon Lock 2” manufactured by Denki Kagaku Kogyo.
In the injector 50, the two liquids pushed out from the syringe 52 using the gun 53 are mixed and mixed at a predetermined ratio while being stirred and kneaded along the spiral groove of the nozzle 51. It is designed to be discharged from the tip.

Further, as shown in FIG. 3B (e), the anchor bolt assembly in which the packing material F has been removed by being transported to the construction site is inserted into the embedded hole 41 into which the adhesive 60 has been injected. In the figure, the coating layer 30 of the assembly is omitted for simplification.
This insertion operation is performed while rotating the assembly around the axis of the anchor bolt 20 as indicated by arrows in the figure. The adhesive 60 is agitated by the rotation of the assembly, and the gaps between the embedding holes 41 and the assembly are filled almost evenly.

As shown in FIG. 3B (f), when the anchor bolt assembly is inserted into the embedding hole 41 for a predetermined embedding length, the inserting operation is completed, and thereafter, the adhesive 60 is cured for a predetermined time until it completely hardens. . In this way, the fixing work of the anchor bolt 20 to the structure 40 is completed.
Here, the assembly body is inserted into the embedded hole 41 only at the coating layer forming portion of the anchor bolt 20.
Also, the injection amount of the adhesive 60 into the embedding hole 41 is filled in almost the entire gap in the embedding hole 41 in a state where the assembly has been inserted into the embedding hole 41 as shown in FIG. 3B (f). In addition, the amount is adjusted to an amount that does not overflow from the opening of the embedded hole 41 at all or only a small amount.
It is preferable that the adhesive 60 slightly leaking from the opening of the embedding hole 41 after the curing is removed by using a grinder or the like and the surface finish is performed.
When a disposable type is used as the syringe 52 or the like of the injector 50, these are discarded after the operation is completed.

According to such a method, as shown in FIG. 4, the apex of the protrusion 12 of the positioning tool 10 abuts against the inner surface of the embedding hole 41 in the state where the assembly is inserted into the embedding hole 41 due to the dimensional relationship described above.
Here, since the distance between the apex of each protrusion 12 and the axis of the anchor bolt 20 is equal, the anchor bolt 20 is accurately positioned at the center of the embedded hole 41.

Further, as shown in FIG. 5, the embedded hole 41 is formed upward with respect to the structure 40, and when the assembly is inserted from below, the protrusion 12 of the positioning tool 10 is formed on the inner surface of the embedded hole 41. Or an adhesive 60 (not shown) filled in the embedding hole is entangled with the protrusion 12 and resistance to movement is generated.
Therefore, the anchor bolt 20 is prevented from dripping from the embedded hole 41 due to its own weight.

FIG. 5 shows another example of the positioning tool 10. Here, as shown in FIG. 5C, the projection 12 of the positioning tool 10 has a triangular prism shape as a whole, and the outer diameter side surface thereof is inclined in the axial direction of the main body to form a wedge surface 12a. ing. That is, the axis of the cylinder of the main body 11 and the axis of the triangular prism of the protrusion 12 are orthogonal.
As shown in FIGS. 5A and 5B, the assembly using the positioning tool 10 is such that the inclined lower end portion of the wedge surface 12a of the positioning tool 10 is positioned closer to the distal end side of the anchor bolt 20 than the inclined upper end portion. In this state, the anchor bolts 20 are mounted in the aligned state.
When the assembly is inserted into the embedding hole 41, the wedge surface 12a bites into the inner surface of the embedding hole 41, so that the anchor bolt 20 is further prevented from dripping.

  The embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, and includes all modifications and variations that fall within the scope of the claims and equivalents thereto.

For example, the adhesive 60 is not limited to the mode of injecting into the embedded hole 41 using the injection machine 50 as in the embodiment, and the injection is performed by inserting a tube into the embedded hole 41 and circulating the inside of the tube. Also good.
However, in the case of injecting the adhesive with a tube, the opening of the embedded hole 41 is closed with a sealing material or the like, and a tube for venting air in the embedded hole 41 is additionally required, which is complicated. Furthermore, after the construction work is completed, it is necessary to remove the sealing material from the opening of the embedding hole 41 and to remove each tube from the embedding hole 41 and discard the sealing material and the tube. When a two-component mixed type is used as the adhesive, it is necessary to previously mix the main agent and the curing agent before flowing into the tube.
Therefore, it is most preferable to use the injection machine 50 according to the embodiment, in which the injection operation and the post-treatment are simple, little waste is generated, and the main agent and the curing agent are mixed automatically.

DESCRIPTION OF SYMBOLS 10 Positioning tool 11 Main body 12 Protrusion 12a Wedge surface 20 Anchor bolt 30 Coating layer 40 Structure 41 Embedded hole 50 Injection machine 51 Nozzle 52 Syringe 53 Gun 60 Adhesive F Packing material D Drill B Blower W Wedge

Claims (6)

A positioning tool to be attached to an anchor bolt of a type that is inserted into an embedded hole of a structure and hardened an adhesive filled in a gap between the embedded hole and fixed to the structure,
A cylindrical body that can be externally fitted to the anchor bolt;
An anchor bolt positioning tool comprising: a plurality of protrusions that are continuously provided on the outer peripheral surface of the main body at intervals in the circumferential direction thereof, and the protrusion amounts in the radial direction of the main body are substantially equal.   2. The anchor bolt positioning tool according to claim 1, wherein the main body and the protrusion are integrally formed of a synthetic resin.   3. The anchor bolt positioning tool according to claim 1, wherein the main body has elasticity, and is placed on the anchor bolt in a state where the diameter is elastically expanded, and then is closely attached to the anchor bolt by being reduced in diameter by restoring elasticity. .   4. The anchor bolt positioning tool according to claim 1, wherein each of the protrusions has a wedge surface that is inclined toward an axial direction of the main body on an outer diameter side. 5. Anchor bolts,
The anchor bolt positioning tool according to any one of claims 1 to 4, wherein two or more are mounted in parallel in the axial direction of the anchor bolt,
An anchor bolt assembly comprising: a coating layer formed by applying and curing a paint on the anchor bolt after the positioning tool is mounted. For a structure, a step of drilling an embedded hole having substantially the same diameter as a virtual circle formed by connecting the apexes of the protrusions of the positioning tool;
Injecting an acrylic resin adhesive into the embedded hole;
Inserting the anchor bolt assembly of claim 5 into the embedded hole after injection of the acrylic resin adhesive while rotating about its axis;
A step of curing until the acrylic resin adhesive is cured, and a method for fixing the anchor bolt to the structure.

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