WO2022163742A1

WO2022163742A1 - Anchor bolt and method for installing same

Info

Publication number: WO2022163742A1
Application number: PCT/JP2022/003022
Authority: WO
Inventors: 晃三宅
Original assignee: 晃三宅
Priority date: 2021-01-28
Filing date: 2022-01-27
Publication date: 2022-08-04
Also published as: JP2024049399A

Abstract

Provided are an anchor bolt that is not displaced under load and a method for installing the same. This bolt has a tip provided with a flange-shaped abutment stop, and a lock ring provided with a plurality of expansion pieces recurved and opened from an annular base end of the lock ring toward the outer side is inserted over this bolt such that the base end side is abutted against the abutment stop of the bolt. This structure makes this bolt function as an anchor bolt which bites the tips of the expansion pieces into a peripheral wall of a fixing hole when the expansion pieces are further opened by the installation. The tips of the expansion pieces are made to be acuter both in width and thickness. The lock ring produces higher strength when a plurality of lock rings are used with intermediation of spacers.

Description

Anchor bolt and its construction method

The present invention relates to anchor bolts, and more particularly to anchor bolts that are not displaced by load and construction methods thereof.

Anchor bolts are used to secure structures to concrete.

The anchor bolt disclosed in Japanese Patent Application Laid-Open No. 10-184627 uses a bolt having a head with a tapered tip and a large diameter. A sleeve having an expansion piece provided with a slit dividing the peripheral wall into a plurality of parts in the axial direction is inserted through the bolt, and the expansion piece corresponds to the taper of the head.

With the above configuration, when the bolt is pulled up by the nut, the tapered head bites into the expansion piece, the diameter of the expansion piece expands in the fixing hole, and the anchor bolt is fixed in the fixing hole. It will be.

In the anchor bolt disclosed in Japanese Patent Application Laid-Open No. 2017-96470, a sleeve having an axial slit formed in the tip end portion to form an expanded portion is inserted through the bolt, and a tapered cone nut is provided at the tip end thereof. is inserted. As a result, when the bolt is turned at the rear end, the cone nut bites into the extension and widens the extension.

In both of the above two examples, the expansion part expands from the shallow side to the deep side of the fixing hole. Therefore, when a large tensile force is applied from the outside in the axial direction, the bolt may come off. Needless to say, the state of the fixing holes at the time of construction, aging deterioration of concrete and metal, etc., have a great influence.

Fig. 9 shows an anchor bolt that realizes a structure in which the expansion part expands from the deep side to the shallow side of the fixing hole.

The direction of the screw is opposite to the front end side 61 and the rear end side 62 of the bolt 60, and the expansion ring 65 is fitted to the front end side 61 with the expansion portion facing the rear end direction of the bolt. From 62, insert a nut 66 with a male taper at the tip. When a hexagonal wrench is inserted from the nut 66 side and the bolt 60 is rotated in the direction in which the expansion ring 65 and the nut 66 abut their front and rear ends, the male taper 68 at the tip of the nut 66 is pushed into the expansion ring 65. The expansion ring 66 bites into the female taper 67 formed at the rear end of the fixing hole, forming a state in which the expansion ring 66 opens toward the mouth of the fixing hole, thereby preventing the bolt from coming off.

Furthermore, in a state in which an adhesive (injection type, capsule type) is pre-filled into a hole drilled in the construction concrete base material and the anchor body is driven in, the adhesive is cured to physically fix the fixing portion. Adhesive anchors have also been used for some time.

JP-A-10-184627 JP 2017-96470 A

As described above, in the structures disclosed in

Patent Documents

1 and 2, the diameter of the expansion portion widens toward the depth of the fixing hole. There is a danger that it will become easier to come off due to the deterioration of concrete and metal, which may lead to a serious accident.

Even if an accident does not occur, when a load is applied, a so-called displacement load occurs, in which the bolt is slightly displaced in the direction of the load.

The configuration shown in FIG. 9 has a structure in which the front end and rear end of the bolt are threaded in opposite directions, and when the bolt is rotated, the expansion ring and the nut move in opposite directions. The ring does not co-rotate with the rotation of the bolt, and spreads from the back of the fixing hole toward the front. Therefore, although the above-mentioned inconvenience is improved, it is troublesome in construction in that it is necessary to cut threads in opposite directions at the front end side and the rear end side of the bolt. There is a drawback that it takes too much.

The adhesive anchor relies only on the chemical strength of the adhesive without the anchor member forming a bridge (crosslinking) in the fixing hole. Service life is a problem because the adhesives can deteriorate over time.

The present invention has been proposed in view of the above conventional circumstances, and an object of the present invention is to provide an anchor bolt that forms a bridge within a fixing hole and does not cause displacement under load, and a method of installing the anchor bolt.

The anchor bolt of the present invention comprises the following bolt and locking ring.

A brim-shaped stop is provided at the tip of the bolt, and a locking ring provided with a plurality of open leg pieces bent outward from the base end of the ring contacts the stop of the bolt at the base end. It is inserted into the bolt so that it touches.

With this configuration, when the leg piece is opened by construction, the tip of the leg piece bites into the peripheral wall of the fixing hole and functions as an anchor bolt.

It is preferable that both the width and the thickness of the tip of the split leg piece are sharpened.

A single locking ring exhibits sufficient strength, but greater strength can be obtained by using a plurality of them via spacers.

　The construction of the anchor bolt of the present invention is carried out according to the following procedure using a hammering jig and a screwing jig.

First, a fixing hole is opened. Next, the bolt with the locking ring inserted therein is inserted into the fixing hole with the contact stopper as the tip. The leg piece is further opened using a jig (striking jig, screwing jig), and the tip of the leg piece is bitten into the wall of the fixing hole to form a bridge.

The gap between the fixing hole and the bolt can be filled with adhesive or can be filled with a bush.

Although only a single locking ring is used above, another locking ring having the same structure as the locking ring is inserted through a spacer, and its open leg pieces are opened using a jig, It is also possible to make it bite into the peripheral wall of the fixing hole.

In the present invention, the tip of the leg piece reliably bites into the peripheral wall of the fixing hole to form a bridge, so that it exhibits a strong anchoring function. High strength is obtained. Also, the gap between the fixing hole and the bolt can be filled with an adhesive or by inserting a bush. Furthermore, by increasing or decreasing the number of locking rings, it is possible to meet the required strength.

1 is a side view showing an anchor bolt of the present invention; FIG. It is a side view which shows the jig|tool used for this invention. It is a flowchart which shows the construction procedure of this invention. It is a figure which shows the processing state of the space|gap of an anchor bolt and a fixing hole. It is a photograph which shows the construction state of this invention. It is a photograph showing the construction state of the present invention and the state of the fixing hole after the anchor bolt is removed. It is a figure which shows another construction example of this invention. It is a figure which shows another construction procedure of this invention. It is a figure which shows an example of the conventional anchor.

FIG. 1 shows an anchor bolt of the present invention, FIG. 1(a) is a side view, and FIG. 1(b) is a sectional view of a locking ring that constitutes the anchor bolt of the present invention.

First, as shown in Fig. 1, a lock ring described below is inserted into the bolt to form an anchor bolt before construction.

As shown in FIG. 1(b), the locking ring 2 has a plurality of (five lobes in the drawing) split leg pieces 22 with a predetermined width at equal intervals in the circumferential direction from a base end ring 21 in the radial direction. It is designed to spread out. Further, the width in the circumferential direction of each open leg piece 22 is tapered from the center to the tip, and the tip is pointed in a triangular shape. Since the number of the split leg pieces 22 is set to an odd number, the cross-sectional view of FIG. 1(b) is not symmetrical.

As shown in FIG. 1( a ), a stopper 11 is provided at the tip of the bolt 1 , and the base end ring 21 of the locking ring 2 is inserted so as to face the stopper 11 side. A simple anchor bolt 10 is constructed.

When constructing the anchor bolts, use the driving jig shown in Fig. 2(a). The driving jig 4 has a driving portion 41 at the tip of which has an outer diameter that fits into the fixing hole 3 described below, and a bolt hole 42 that has a diameter and depth that allows the bolt 1 to fit in the axial direction, extending from the tip to the rear end. placed towards the side. Furthermore, the rear end serves as a driving head 43 .

FIG. 3 is a diagram showing the procedure for installing the anchor bolts.

First, as shown in FIG. 3(a), a fixing hole 3 is drilled in the construction site of the concrete structure.

The diameter of the fixing hole 3 is such that the leg opening piece 22 of the locking ring 2 inserted into the bolt 1 can be accommodated before construction. is smaller than the diameter of

The anchor bolt 10 is inserted into the fixing hole 3 so that the stopper 11 side is the leading end (back side of the fixing hole 3) and hits the bottom (Fig. 3(b)).

In the above state, when the bolt 1 constituting the inserted anchor bolt 10 is inserted into the bolt hole 42 of the driving jig 4, and the driving portion 41 at the tip of the jig 4 is inserted into the fixing hole 3, driving is performed. The tip of the portion 41 comes into contact with the inner side of the open leg piece 22 of the locking ring 2 (FIG. 3(c)). In this state, when the driving head 43 at the rear end of the jig 4 is strongly hit with a hammer drill or the like, the leg pieces 22 are opened.

As shown in FIG. 3(d), the open leg piece 22 has a sharp tip that breaks into the peripheral wall of the fixing hole 3 and bites into it to form a bridge, which is firmly fixed.
It should be noted that if the front end surface of the driving jig 4 is formed into a shape that is gradually widened with a large outer diameter, and the shape is similar to the initial widened shape of the leg pieces 22, when the driving jig 4 is driven as described above, In addition, the open leg piece 22 can be easily opened.

After that, when the driving jig 4 is pulled out, the anchor bolt 10 is fixed in the fixing hole 3 (Fig. 3(e)).

Here, as shown in FIG. 4(a), the gap between the fixing hole 3 and the bolt 1 is filled with an adhesive R to obtain a metal anchor having higher strength. At this time, as shown in FIG. 4(b), the adhesive R may be filled after the metal bush B is inserted. Preferably, the metal bush B is threaded into the bolt 1 with an internal thread.

FIG. 5 is a photograph showing a state in which the anchor bolt 10 of the present invention is driven into the fixing hole 3 by cutting the fixing hole 3 in the axial direction. As described above, it can be confirmed that the tip of the open leg piece 22 is opened from the fixing hole 3 and bites into the hole wall.

The photograph in FIG. 6 shows a state in which the anchor bolt 10 is removed from the state in which the fixing hole 3 is cut in the axial direction as in FIG. It can be confirmed that a hole 31 is formed after the tip of the leg piece 22 bites into the hole wall of the fixing hole 3 .

FIG. 7 illustrates a case where a plurality of locking rings 2 are used.

As described above, the locking ring 2 on the front end side inserted into the bolt 1 is driven by the driving jig 4 to be fixed in the fixing hole 3, and then the locking ring 2 on the rear end side is inserted through the bush-like spacer 23. is inserted, and the split leg piece 22 is widened by the driving jig 4 in the same manner as described above.

With this, it is certain that the fixing strength will be higher than in the case where there is only one locking ring 2. Of course, it is also possible to further increase the number according to the strength required.

In the above description, the split leg piece 22 is widened by the driving jig 4, but as shown in FIG. The split leg piece 22 may be widened by inserting the driving jig 4 from the rear end side of the spacer 23 and driving the spacer 23 . When two locking rings 2 are used, the locking ring 2 on the rear end side can be subsequently inserted.

Instead of the driving jig 4, a screwing jig 5 shown in FIG. 2(b) can be used. That is, it is a structure in which the screwed nut 51 can be fitted into the fitting hole 52 at the tip.

With the anchor bolt 10 having the locking ring 2 inserted into the bolt 1 inserted into the fixing hole 3 , the screwing jig 5 with the nut 51 screwed into the fitting hole 52 at the tip is attached to the anchor bolt 10 . Tighten into bolt 1. When the tip of the screw-in nut 51 hits the leg piece 22 of the lock ring 2, it is further screwed in to widen the leg piece 22.例文帳に追加

Also in this case, it is preferable that the tip side of the screw-in nut 51 has a shape in which the outer diameter is greatly curved and widened so that the shape matches the opening condition of the leg pieces 22 .

As described above, according to the present invention, since the tip of the open leg piece of the locking ring constituting the anchor bolt bites into the peripheral wall of the fixing hole, when a strong load is applied, the tip further bites into the concrete and is not displaced by the load. You can accept it, and you can't get out of it.

1 bolt 2 locking ring 3 fixing hole 4 driving jig 5 screwing jig 11 stop 21 locking ring 22 locking piece 23 spacer 41 driving part 42 bolt hole 43 driving head 51 nut 52 fitting hole 60 bolt (61 tip side, 62 rear end side)
65 Expansion ring 66 Nut 67 Female taper 68 Male taper B Bush R Adhesive

Claims

A bolt with a brim-shaped stop at the tip,
An anchor comprising a plurality of open leg pieces bent outward from a base end of an annular shape, and a locking ring inserted into a bolt so that the base end side abuts against a stop of the bolt. bolt.
The anchor bolt according to claim 1, wherein the tip of said open leg piece is sharpened in both width and thickness.
The anchor bolt according to claim 1 or 2, wherein at least one set of a spacer and another locking ring having the same structure as the locking ring is inserted into the bolt into which the locking ring is inserted.
A step of opening a fixing hole; A step of inserting the anchor bolt according to claim 1 or 2 into the fixing hole with the stopper as a tip.
A step of further opening the leg-spreading piece using a jig to bite the tip of the leg-spreading piece into the wall of the fixing hole.
A method of installing an anchor bolt, comprising:
(4) further comprising a step of inserting another locking ring having the same structure as said locking ring through a spacer, opening the leg pieces by using a jig, and making it bite into the shadow of said fixing hole. Construction method of the anchor bolt described in .
6. The anchor bolt installation method according to claim 4 or 5, further comprising a step of filling a gap between the fixing hole and the anchor bolt with an adhesive.