JP2002061297A - Plug for anchor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new plug for an anchor, enabling the easy execution of work for the anchor within a short time by using the advantages of an extension anchor and a chemical anchor and dispensing with a means such as temporal tacking even when an anchor bolt is horizontally supported on a vertical concrete wall surface. SOLUTION: The plug serving as the component of the anchor for forming a fixed part in a concrete part is provided with a bottomed cylindrical-part body 11 inserted for arrangement into a prepared hole 6 opened from the surface of the concrete part. The plug is characterized as follows: the bottom part 12 of the body 11 is formed with an adhesive injecting hole 13; and the inner periphery of the hole 13 is formed into such a shape as to allow the nozzle end 24a of an adhesive injecting device 20 for injecting an adhesive 18 into the prepared hole 6 of the concrete part to be inserted and tightly fitted into the hole 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug for an anchor, and more particularly, to a plug which is a component of an anchor used for forming a fixing portion on a concrete wall, for example.

[0002]

2. Description of the Related Art In recent years, the value of concrete buildings built using an external heat insulation method has been increasing. The external heat insulation method refers to a method of constructing a concrete structure constituting a building by surrounding the concrete structure with a heat insulating material from the outside so as to minimize the influence of the outside temperature.

[0003] The adoption of such an external heat insulation method significantly improves the living environment in a concrete building. In particular, the energy saving effect is high as compared with internal heat insulation in which a heat insulating material is arranged inside a concrete frame. It is possible to provide a living space which is excellent both economically and environmentally, for example, by significantly reducing the occurrence of dew condensation on the indoor side in winter.

When a concrete building is constructed by using such an external heat insulating method, an outer wall surface of a concrete frame 1 is covered with a heat insulating material 2 such as rock wool as shown in FIG. A structure in which a plurality of base materials 3 are erected at predetermined intervals along the outer surface of the base material 2 and the exterior finishing material 4 is attached using the base materials 3 is generally used as an outer wall structure.

[0005] As means for firmly supporting the base material 3 to which the exterior finishing material 4 is attached to the concrete frame 1, a special mounting bracket 5 made of a material having low thermal conductivity as shown in FIG. It is done using many. As a specific mounting structure of the base material 3 by each mounting bracket 5, one end of the cutting bolt 5 a is screwed and fixed to an expandable anchor or a chemical anchor which is driven into the concrete skeleton 1 from the outer wall surface side. Is done.

At this time, one end of the cutting bolt 5a is screwed to the anchor through an insertion hole formed at one end of the reinforcing stay 5b, and a nut previously screwed to the cutting bolt 5a is tightened. One end is fixed to the surface of the concrete skeleton 1. The slicing bolt 5a extends substantially vertically from the outer wall surface of the concrete skeleton 1, passes the other end through an insertion hole formed in the side surface of the base material 3, and is fixed by tightening nuts from both sides of the base material side surface. .

As the anchor used to form the fixing portion on the concrete wall as described above, an expandable anchor or a chemical anchor is used. The former expandable anchor is also called a grip anchor, and is mounted on a concrete wall or the like. Drill a prepared hole of a predetermined diameter, insert a conical plug into the distal end of the anchor body, insert it into the prepared hole, drive it in with a hammer, etc., so that the plug enters the distal end of the anchor. The expanded portion is attached by expanding and engaging the inner wall of the prepared hole with pressure.

In the chemical anchor, a prepared hole having a predetermined diameter is drilled in a concrete wall or the like, a strong adhesive is filled therein, and then the embedded portion of the anchor bolt is inserted into the prepared hole to bond the hole. It is fixed by the agent. These expandable anchors and chemical anchors include
There are various types, but basically, as described above, a pilot hole is drilled in the concrete wall surface in advance and attached.

[0009]

However, such a conventional anchor has the following problems. That is,
In the expandable anchor, as described above, since the distal end expanded portion is expanded and pressed against the inner wall of the prepared hole, there is an advantage that the installation is very easy and the work can be performed in a short time.

[0010] However, in the case of the expandable anchor, the press-fitting engagement surface of the pilot hole becomes brittle with age and collapses, or the aggregate such as gravel exposed on the inner surface of the pilot hole when forming the pilot hole is left as it is. There is a possibility that a problem may occur in which a predetermined contact strength may be reduced with time or may not be obtained from the beginning due to the fact that a good pressure contact lock cannot be obtained due to a drop-out and a recess. Was.

On the other hand, a chemical anchor is prepared by filling a pilot hole formed in a concrete wall with a strong epoxy adhesive, for example, and inserting an embedded portion of an anchor bolt into the pilot hole to adhere integrally with concrete. Therefore, there is no possibility that the problem that occurs in the expandable anchor as described above occurs.

However, in the case of a chemical anchor, for example, in a case where the anchor is provided on a vertical concrete wall surface and an anchor bolt is inserted substantially perpendicularly to the wall surface and the wall is supported horizontally, the adhesive is completely hardened to a predetermined level. In some cases, the anchor bolt may be inclined by its own weight and may not be horizontal until the strength of the anchor bolt is exhibited.

In order to prevent this, some measures such as temporarily fixing the anchor bolts inserted in the pilot holes by another means are taken. However, when as many as 100 or 200 anchor bolts are fixed to the concrete wall almost simultaneously. However, there has been a problem that such temporary fixing work takes too much time and labor, and significantly lowers the efficiency of anchor construction.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems. An advantage of the expandable anchor and the chemical anchor is that the anchor can be easily and quickly installed in a vertical concrete. An object of the present invention is to provide a new anchor plug that does not require any means such as temporary fixing even when the anchor bolt is horizontally supported on a wall surface.

[0015]

SUMMARY OF THE INVENTION The present invention is a plug for an anchor, and is constituted as follows in order to solve the above-mentioned technical problem. That is, the present invention relates to a plug which is a component of an anchor forming a fixing part in a concrete part, and has a bottomed cylindrical part main body inserted and arranged in a prepared hole opened from the surface of the concrete part; And an adhesive injection hole formed at the bottom of the shaped body,
The inner peripheral shape of the adhesive injection hole is formed in such a shape that the tip end of the nozzle of the adhesive injection device for injecting the adhesive into the prepared hole of the concrete portion can be inserted and tightly fitted. I do.

<Specific Configuration in the Present Invention> The anchor plug according to the present invention includes the above-mentioned essential components, but is established even when the components are specifically as follows. The specific component is characterized in that a flange portion is formed around the entrance end of the tubular portion main body so as to be fitted to the chamfered portion of the prepared hole.

In the plug for an anchor according to the present invention, at least one notch extending in the longitudinal direction of the tubular main body is formed on the outer peripheral surface of the flange, and the notch is formed in the tubular main body. It is characterized in that it communicates with a gap between the outer peripheral surface and the inner peripheral surface of the pilot hole. It is also preferable to form a groove or an uneven portion on the outer peripheral surface of the cylindrical portion main body. Further, it is preferable that a female screw portion is formed on the inner peripheral surface of the tubular portion main body so that an anchor bolt can be inserted and held and fixed from the inlet end of the tubular portion main body.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a plug for an anchor according to the present invention. FIG. 1 shows a state where an anchor plug 10 according to an embodiment of the present invention is inserted into a pilot hole 6 formed by drilling a hole in a concrete frame 1 with a drill or the like.

An anchor plug 1 according to this embodiment
1 has a bottomed cylindrical body 11 as shown in FIG. 1, and an adhesive injection hole 13 is formed on the bottom 12 of the cylindrical body 11 on the central axis. In the inner peripheral part on the inlet end side opposite to the axial direction,
A female screw portion 14 for holding and fixing the anchor bolt by screwing is formed.

The inner peripheral shape of the adhesive injection hole 13 formed in the bottom portion 12 of the cylindrical portion main body 11 is
The tip of the nozzle of the adhesive injection device that fills the prepared hole 6 with the adhesive is formed in a shape that can be tightly inserted and fitted. Here, the adhesive injection device will be briefly described.

The adhesive injecting device is already used as an instrument for injecting an adhesive into a pilot hole formed in a concrete portion when a chemical anchor is installed in a concrete portion such as a concrete frame, and is very well used. Are known. This adhesive injection device basically includes a cartridge containing an adhesive, an injector that squeezes the adhesive and pushes it out of a spout of the cartridge, and a taper that guides the adhesive discharged from the spout of the cartridge to a pilot hole. Nozzle.

The mainstream of such an adhesive injection device is a one-liquid injection system, but at present there is also a two-liquid mixture injection system. FIG. 4 shows the adhesive injection device 20 of the two-liquid mixture injection method. In the two-liquid mixing / injecting type adhesive injecting apparatus 20, when the lever 21a of the injector 21 is pulled, the two plungers 21b advance to push the rear portions of the two cartridges 23, and from the spout of each cartridge 23, respectively. The epoxy resin and hardener are extruded.

Each of the epoxy resin and the curing agent extruded from the two cartridges 23 is sent to a tapered tip 24a through two independent passages formed inside the mixing nozzle 24, Tip 2
The two liquids are mixed in 4a, and the mixed adhesive liquid is discharged from the leading end outlet.

An anchor plug 1 according to this embodiment
The important configuration at 0 is that the inner peripheral shape of the adhesive injection hole 13 formed at the bottom of the cylindrical portion main body 11 is tapered when the mixing nozzle 24 of the adhesive injection device 20 is inserted from the inside of the plug 10. The tip portion 24a is formed in a shape that can be inserted into the adhesive injection hole 13 and fitted tightly. At this time, the tip outlet of the mixing nozzle 24 may protrude outward from the adhesive injection hole 13 (to the rear of the prepared hole 6).

Further, in the anchor plug 10 according to the present embodiment, a flange portion 15 is formed around the entrance end of the tubular portion main body 11. A groove 16 extending in the longitudinal direction is provided on the outer peripheral surface of the cylindrical body 11 as shown in FIG.
Are formed at regular intervals of 90 degrees in the circumferential direction.
6 is formed up to the outside of the entrance end of the tubular body 11.

More specifically, each groove 16 formed on the outer peripheral surface of the cylindrical body 11 is formed continuously up to the back surface of the flange 15, and as shown in FIG. It communicates with a notch 17 formed on the outer peripheral edge of the flange 15 on the direction extension line.

Therefore, as shown in FIG. 3, when the anchor plug 10 is viewed from the front side, that is, from the entrance end side,
Four notches 17 are visible at 90 ° intervals in the circumferential direction on the outer peripheral edge of the flange portion 15, and each of these notches 17 is continuous from the back surface of the flange portion 15 to the outer peripheral surface of the tubular portion main body 11. Thus, it is in communication with the groove 16 formed.

However, in the anchor plug according to the present invention, the groove 16 formed on the outer peripheral surface of the tubular body 11 is not an essential requirement. That is, the tubular portion main body 1
Since there is even a slight gap between the outer peripheral surface of the base 1 and the inner peripheral surface of the pilot hole 6 formed in the concrete skeleton 1, the adhesive sufficiently flows to the opening side of the pilot hole 6. The problem is the collar 15
It is necessary to confirm that the adhesive overflows from the pilot hole 6 beyond the hole. Therefore, a notch portion 17 is formed only in the flange portion 15, and this notch portion 17 is 11
It is sufficient if it communicates with the gap between the outer peripheral surface of the base member and the inner peripheral surface of the pilot hole 6.

Next, a description will be given of a method of using the anchor plug 10 configured as described above, in other words, a procedure of attaching the plug 10 to the pilot hole 6 formed in the concrete skeleton 1. The procedure for attaching the anchor plug described below is for the case where the plug 10 is bonded and fixed to the prepared hole 6 formed in the concrete skeleton 1 with a two-component mixed adhesive.

First, a pilot hole 6 having an inner diameter slightly larger than the outer diameter of the tubular portion main body 11 is drilled in the concrete frame 1 by using a drill or the like, and at the same time, the anchor plug 10 is formed.
The flange 15 formed on the outer periphery of the entrance end of the cylindrical portion main body 11 is chamfered around the opening of the pilot hole 6 so that the end surface on the entrance end side becomes flat with the wall surface of the concrete skeleton 1. Thereafter, the inside of the pilot hole 6 is cleaned to remove chips and the like.

Next, the mixing nozzle 24 of the adhesive injection device 20 is relatively inserted into the plug 10 from the inlet end, and the tip 24a of the mixing nozzle 24 is attached to the adhesive 12 formed on the bottom 12 of the cylindrical body 11. It is inserted into the injection hole 13 and fitted tightly. The tip portion 24a of the mixing nozzle 24 is generally tapered frusto-conical as described above, and therefore, the adhesive injection hole 1
The inner peripheral shape of 3 is a shape corresponding to this.

Therefore, when the tip 24a is inserted into the adhesive injection hole 13 from the inside of the plug 10, the tip 24a of the mixing nozzle 24 can be inserted at a predetermined insertion degree.
Is in close contact with the inner peripheral surface of the adhesive injection hole 13, and no further insertion is possible. In this state, it is desirable that the end face of the tip discharge port at the tip portion 24a of the mixing nozzle 24 coincides with the outer end face on the back wall side of the plug 10.

In this manner, the plug 10 is put on the front end 24a of the mixing nozzle 24 and
Is tightly fitted into the adhesive injection hole 13 so as to be relatively stably held. And in this state,
Holding the adhesive injection device 20, the mixing nozzle 24 is inserted into the prepared hole 6.

As a result, the plug 10 held at the tip 24a of the mixing nozzle 24 is inserted into the pilot hole 6, and when the flange 15 at the inlet end is fitted into the chamfered portion of the pilot hole 6, the plug 10 is lowered. Approach to 6 stops. When the flange 15 of the plug 10 fits into the chamfered portion of the pilot hole 6 and its entry stops, the lever 21a of the injector 21 is pulled as it is.

Thus, the epoxy resin and curing agent 2
The liquid is extruded from each cartridge 23, passes through the mixing nozzle 24, is mixed and discharged at the tip 24 a, and is injected into the pilot hole 6. Next, when the adhesive 18 injected into the pilot hole 6 is completely turned around the pilot hole 6 and becomes full, as shown by reference numeral 18a in FIG. It overflows from the notch 17 of the flange 15 through the formed groove 16.

The overflow state makes it possible to detect that the adhesive 18 has been sufficiently filled in the prepared hole 6. Thereafter, the surface of the flange portion 15 of the plug 10 is pressed with a finger or the like to prevent the plug 15 from coming out of the prepared hole 6, and the adhesive injection device 20 is stopped.
Is separated from the concrete frame 1, the mixing nozzle 2
4 is pulled out from the adhesive injection hole 13,
The plug 10 remains in the prepared hole 6 as it is.

The plug 10 is left as it is until the adhesive 18 filled in the pilot hole 6 is hardened.
After the hardening of the plug 8 and the plug 10 is firmly adhered to the concrete frame 1 in the pilot hole 6, an anchor bolt such as a trim bolt 5a is screwed into the plug 10 from the entrance end.

[0038] This makes it possible to prevent the occurrence of inclination of the anchor bolt, which has conventionally been a problem when a chemical anchor is installed on a vertical concrete wall or the like, and to reduce the grip force generated by the expandable anchor. , And the advantage of both types is that they can be easily installed and maintain the fixing force for a long time.

In the embodiment of the present invention described above, the anchor is formed on the wall surface of the concrete skeleton. However, the present invention is not limited to such an example, and the present invention is not limited to this. The present invention can be applied to a case where a pilot hole is made in a hole, and one end of a bar or a bolt is embedded in the pilot hole and fixed.

[0040]

As described above, according to the plug for an anchor of the present invention, it is possible to easily and quickly construct an anchor by using the advantages of the conventional expandable anchor and the chemical anchor, and to use the vertical concrete. It is possible to provide a novel anchor plug that does not require any means such as temporary fixing even when the anchor bolt is horizontally supported on the wall surface.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a state where an anchor plug according to an embodiment of the present invention is attached to a pilot hole formed in a concrete skeleton.

FIG. 2 is a cross-sectional view of the anchor plug shown in FIG. 1 taken along line 2-2.

FIG. 3 is an end view of the anchor plug shown in FIG. 1 as viewed from a wall surface side of a concrete skeleton.

FIG. 4 is an exploded perspective view showing an example of an adhesive injection device used when an anchor plug according to the present invention is inserted into a pilot hole formed in a concrete portion and fixed with an adhesive.

FIG. 5 is a partial perspective view showing an external wall structure of a conventional external insulation concrete building.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete skeleton 2 Heat insulating material 3 Base material 4 Exterior finishing material 5 Mounting bracket 5a Dimension cutting bolt 5b Reinforcement stay 10 Plug for anchor 11 Cylindrical part main body 12 Bottom part 13 Adhesive injection hole 14 Female screw part 15 Flange part 16 Groove part 17 Notch 18 Adhesive

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D041 GC02 GC04 GD01 2E125 AA48 AA76 AF01 AG03 AG10 AG13 AG16 BA13 BA23 BB08 BB19 BB24 BB25 BB27 BE07 BE08 BF01 CA01 CA13 CA85 EA33

Claims (5)

[Claims] 1. A plug which is a component of an anchor forming a fixing portion in a concrete portion, comprising a bottomed tubular portion main body inserted into a pilot hole formed from a surface of the concrete portion, and And an adhesive injection hole formed at the bottom of the unit main body, and the inner peripheral shape of the adhesive injection hole is a nozzle tip of an adhesive injection device for injecting an adhesive into the lower hole of the concrete part. A plug for an anchor, which is formed in a shape that can be inserted and tightly fitted. 2. The anchor plug according to claim 1, wherein a flange portion is formed around an entrance end of the tubular portion main body so as to fit into a chamfered portion of the pilot hole. 3. At least one notch extending in a longitudinal direction of the tubular portion main body is formed on an outer peripheral surface of the flange portion,
3. The anchor plug according to claim 1, wherein the notch communicates with a gap between an outer peripheral surface of the cylindrical body and an inner peripheral surface of the pilot hole. 4. 4. A groove or an uneven portion is formed on an outer peripheral surface of the cylindrical portion main body.
A plug for an anchor according to any one of the above. 5. A female screw portion is formed on an inner peripheral surface of the cylindrical portion main body to hold and fix an anchor bolt inserted from the inlet end of the cylindrical portion main body by screwing. A plug for an anchor according to claim 1.