JPH029136B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Field of Application) The present invention relates to a method and an anchor device for fixing an anchor to a concrete frame for supporting newly installed reinforcing concrete and various other equipment on the concrete frame. (Prior Art) Conventionally, as an anchor for supporting various other equipment with reinforced concrete on a concrete frame, for example, as shown in FIGS. form 32,
A longitudinal slit 33 is formed on the peripheral wall of the cylindrical portion 32.
The cylindrical portion 32 is divided to form an expansion piece 34, and an expansion hair wedge 35 is fitted to the end of the cylindrical portion 32, and this is inserted into an anchor hole 37 drilled in a concrete frame 36. By driving the protruding end of the anchor main rod 31 with a hammer or the like, the expansion wedge 35 is press-fitted into the cylindrical part 32, thereby expanding the expansion piece 34 within the anchor hole 37. There is a known device that uses a mechanical structure to prevent it from coming off (for example, Utility Model Publication No. 60-6651). With conventional anchors that use such a mechanical structure to anchor the anchor in the anchor hole, they are anchored only by the expanded piece at one end of the anchor main rod, which reduces the resistance to axial tensile loads. If the diameter of the anchor hole is small, especially if the diameter of the anchor hole is too large compared to the diameter of the anchor main rod, the resistance force will be even smaller. In addition to the mechanical structure described above, the seventh
As shown in the figure, each liquid 38a of the two-component mixed adhesive is placed on the tip side of the expansion piece 34 fitted with the expansion wedge 35.
A capsule 39 in which the anchor rod 38b is isolated and sealed is attached, and the capsule 39 is destroyed by driving the anchor main rod 31, and at the same time the expansion wedge 35
(for example, Jikosho)
No. 55-10655) is known. (Problems to be Solved by the Invention) In such conventional fixing methods, the latter method in which an adhesive is used in conjunction with the fixing by the mechanical structure has a problem that the resistance against tensile load in the axial direction is only due to the pressure bonding by the mechanical structure. Although it is superior to , it has the following problems. (1) It is generally preferable for the adhesive to have a short curing time, but in that case, it is necessary to implant the expansion piece immediately after embedding the anchor main rod, and the time has elapsed since the capsule was ruptured. Then expansion becomes impossible. (2) Since implantation is performed after capsule destruction,
The hardened layer portion of the adhesive that is about to harden will be destroyed by the expansion action of the expansion piece. (3) It is difficult to confirm whether expansion with the expansion piece has been performed reliably. (4) In order to mix the two adhesives, it is necessary to stir the capsule after it is broken, but this is done using the main anchor rod, which makes it troublesome to install the equipment afterwards. The present invention was made with the aim of solving such problems. (Means for Solving the Problems) The gist of the present invention for solving the above-mentioned problems is to drill a bottomed anchor hole from the surface of a concrete body using an appropriate drilling means, and insert the anchor hole into the anchor hole. An anchor main rod having a hollow cylindrical shape and an expansion piece divided by a longitudinal expansion slit at the tip, and a tapered expansion wedge at the tip opening of the anchor main rod. The narrow diameter side ends of the expansion wedges are fitted together and inserted, the protruding end of the expansion wedge is brought into contact with the bottom of the anchor hole, and the anchor main rod is driven in to expand the expansion pieces. Destruction by inserting a stirring rod into the anchor main rod to destroy a double-component mixed adhesive capsule that separates and encloses a plurality of liquid agents inserted into the hollow interior of the anchor main rod in advance or after the expansion piece is expanded. A method for fixing an anchor to a concrete framework, characterized in that at the same time the double liquid inside is mixed and stirred and extruded into the gap between the anchor main rod and the inner surface of the anchor hole, and the anchor main rod has a hollow cylindrical shape. death,
The anchor main rod has a large diameter portion on the inner surface of the distal end thereof, the inner diameter of which is increased with the stepped portion as a boundary, and is divided by a plurality of slits extending in the longitudinal direction at the large diameter portion side end of the anchor main rod. Equipped with an expansion piece,
A double-liquid mixed adhesive capsule having a flange at one end that engages with the stepped portion and in which a plurality of liquids are isolated and sealed inside is housed in the hollow interior of the anchor main rod; The present invention relates to a concrete frame anchor device in which a narrow diameter side end of a tapered expansion wedge is fitted into the concrete frame anchor device. (Example) Next, an example of the present invention will be described with reference to the drawings. First, an example of the implementation of the invention of the anchor device used to carry out the method of the invention will be described with reference to FIGS. 1 and 2. 1 in the figure is the anchor main rod. This anchor main rod 1 is made of either JISG3101 general structural rolled steel or JIS3123 polished rod, and is formed into a cylindrical shape with a through hole 2 in the center, with a step 3 on the inner surface of the tip. A large diameter portion 4 is formed with a larger inner diameter. Furthermore, expansion pieces 6, 6 are separately molded at the end on the large diameter portion 4 side by longitudinally oriented slits 5, 5. A double-liquid mixed adhesive capsule 7 is accommodated in the through hole 2 of the anchor main rod 1. This capsule 7
is formed into an elongated shape with an outer diameter smaller than the inner diameter of the through hole 2, and one end of the main body is inserted into the large diameter portion 4,
A flange 8 that engages with the stepped portion 3 is integrally molded and inserted into the through hole 2 with the flange 8 facing the large diameter portion 4 side. A small capsule 7a is enclosed within the capsule 7, and a base agent 9a and a curing agent 9b are enclosed and separated inside and outside the small capsule 7a. Both of the capsules 7 and 7a are made of a fragile material such as glass. This capsule 7
Commercially available adhesives can be used.Currently commercially available adhesives are broadly classified into polyester adhesives and epoxy adhesives, and any of them can be used. Further, the narrow-diameter end of the expansion wedge 10 is press-fitted into the opening at the tip of the large-diameter portion 4 . This expansion wedge 10 is formed into a tapered shape, and a short shaft portion 9a of equal diameter is formed at the narrow diameter end of the tip.
This shaft portion 10a is press-fitted into the opening at the tip of the large diameter portion 4. On the other hand, there is a stirring rod 1 in the through hole 2 of the anchor main rod 1.
1 is inserted. This stirring rod 11
The tip 11a is pointed at an obtuse angle, and a concave groove 12 is formed around the tip 11a, and the other end can be held by the chuck of an electric drill (not shown). Next, the anchor fixing method of the present invention using the above-mentioned anchor device will be explained with reference to FIG. First, as shown in Figure 3, the concrete frame 2
Drill the anchor hole 22 with the drill 21 from the surface of the
perforate. This anchor hole 22 is formed to a size such that the anchor main rod 1 described above can be easily inserted therein. Next, as shown in FIG. 3, the anchor main rod 1 with the capsule 7 and expansion wedge 10 fitted in advance is inserted into the anchor hole 22, and the protruding end of the anchor main rod 1 is inserted as shown in FIG. A driving metal fitting 23 is set on the part and driven in with a hammer 24. By this driving, the expansion wedge 10 is pushed into the large diameter part 4, and the expansion pieces 6, 6 are expanded at the deep part of the anchor hole 22, and are bitten into the peripheral hole wall surface, causing mechanical damage. It is prevented from coming off. After that, as shown in FIG.
, and insert the stirring rod 1 into the through hole 2 of the anchor main rod 1.
1, and push it in while rotating it using an electric drill. This results in capsules 7 and 7b
At the same time as the main ingredient 9a in the capsule is mixed and stirred with the curing agent 9b, the slits 5, 5
The mixed and stirred adhesive 25 is extruded into the gap between the anchor main rod 1 and the anchor hole 22, the gap is filled, and the adhesive 25 is fixed. As shown in FIG. 3, the tip of the anchor main rod 1 fixed in this manner is supported by screwing an appropriate fixing metal fitting 26 together. In addition, although the above-mentioned embodiment shows a case in which the capsule 7 is housed in the anchor main rod 1 in advance, the anchor fixing method of the present invention uses the anchor main rod 1 in which the capsule 7 is not housed in advance. After driving this into the anchor hole 22 and expanding the expansion piece, an adhesive capsule without a flange 8 is inserted from the protruding end side, and this is broken, mixed and stirred with the stirring rod 11 in the same manner as described above. It may also be extruded. (Test example) Using the anchor device shown in Figures 1 and 2,
Anchor No. 1 fixed by the process shown in Figure 3
A comparison was made with target anchors No. 4 to 8, which were anchor devices similar to those in No. 3 and which were fixed only by expanding the expansion piece in the anchor hole without using adhesive, and the tensile test results were as follows. The results are as shown in Table 1, and the load deformation curve of the tensile test was as shown in FIG.

[Table] (Effects of the Invention) The present invention is configured as described above, and the expansion of the expansion piece of the anchor main rod and the mixing and stirring of the adhesive are performed in separate steps, so the expansion of the expansion piece of the anchor main rod is performed in separate steps. Opening is performed reliably, and work in the ceiling direction is easy because the initial anchor holding force is applied just by tapping the anchor body. Furthermore, since the adhesive is poured after the anchor body is expanded, stable adhesive fixation can be obtained without destroying the cured layer of the adhesive, and the adhesive is filled in the areas where tensile load is most applied. This ensures reliable strength. Also, by marking the core or measuring its protrusion, there are various effects such as being able to check the construction status when driving the anchor body.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of the anchoring device of the present invention, Fig. 2 is a longitudinal cross-sectional view of the same, Fig. 3 is a longitudinal cross-sectional view showing the steps of an example of the anchor fixing method of the present invention, and Fig. 4 is a test Graph showing the results of the example, FIG. 5 is a vertical cross-sectional view showing an example of a conventional anchor device in a state before it is fixed, FIG. 6 is a vertical cross-sectional view showing the same fixed state, and FIG.
The figure is a longitudinal sectional view showing another conventional anchor device. DESCRIPTION OF SYMBOLS 1... Anchor main rod, 2... Through hole, 3... Step part, 4... Large diameter part, 5... Slit, 6... Expansion piece, 7... Capsule, 8... Flange, 10... …
Expansion wedge, 11... Stirring rod, 20... Concrete frame, 22... Anchor hole, 23... Driving metal fitting, 24... Hammer, 25... Adhesive.

Claims (1)

[Scope of Claims] 1. An anchor hole with a bottom is drilled from the surface of the concrete body using a suitable drilling means, and a hollow cylindrical slit for expansion is provided at the tip of the anchor hole in the longitudinal direction. Insert the anchor main rod having the expansion piece divided into two parts by fitting the small diameter side end of the tapered expansion wedge into the tip opening of the anchor main rod, and The protruding end of the anchor is brought into contact with the bottom of the anchor hole and the anchor main rod is driven in to expand the expansion piece, and then inserted into the hollow interior of the anchor main rod either beforehand or after the expansion piece is expanded. Insert a stirring rod into the anchor main rod to destroy the double-component mixed adhesive capsule containing a plurality of separated liquids, and at the same time mix and stir the double liquids inside the anchor main rod and the anchor hole. A method for fixing anchors to concrete structures, which is characterized by extruding them into the gap between them and the inner surface. 2. It has a hollow cylindrical anchor main rod, and has a large diameter part on the inner surface of the distal end of the anchor main rod, the inner diameter of which is increased with a step as a boundary, and a large diameter part on the side end of the large diameter part of the anchor main rod. The anchor includes a plurality of expansion pieces divided by a plurality of slits extending in the longitudinal direction, and has a flange at one end that engages with the stepped portion in the hollow interior of the main anchor rod, and isolating a plurality of liquids therein. A concrete frame anchor device which houses a sealed double-liquid mixed adhesive capsule and has a narrow diameter side end of a tapered expansion wedge fitted into the large diameter side tip.