JPH06193151A - Widening anchor - Google Patents

Abstract

PURPOSE:To securely prevent an anchor body from rotating together with a nut on fastening the nut of a widening anchor and easily carry out the fastening work of nuts. CONSTITUTION:A widening sleeve 5 provided with a plurality of split grooves 6 axially extending to the front to enable to widen, is fitted to the anchor body 2 having a conical plug 4 at the front end of a screw rod 3 and a nut 7 screwed from the base end of the above screw rod 3 is fastened. In the widening anchor of a type pulling the conical plug 4 into the widening sleeve 5, a protrusion 11 preventing the rotation to fit the split grooves 6 of the widening sleeve 5 is provided at the outer face of the conical plug 4. And a claw 13 radially protruding to prevent the rotation is provided at the outer peripheral face of the base end of the widening sleeve 5. A long nut is used for the nut 7 and a long size suspension bolt 10 is screwed and fastened in the screw hole 9 provided at the opposite side of the screw hole 8 fastened on the screw rod 3. The nut 7 is rotated by use of the suspension bolt 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expanding anchor suitable for fixing hanging bolts and other mounting members to a structure such as a concrete skeleton.

[0002]

2. Description of the Related Art At present, as an expansion anchor of this type, an expansion main body having a conical plug at the tip of a screw rod is provided with a plurality of axially extending split grooves on the tip side thereof to enable expansion. A large number of types are used in which a sleeve is fitted and a nut member screwed from the proximal end side of the screw rod is tightened to pull the conical plug into the expanding sleeve.

[0003]

When such an expansion anchor is used, the expansion of the expansion anchor is taken into consideration in consideration of variations in the diameter of the drill for making mounting holes in the concrete skeleton and wear of the drill during use. The mounting hole is opened using a drill slightly larger than the outer diameter of the open sleeve. For this reason,
There is a considerable gap between the expansion anchor inserted in the mounting hole and the mounting hole.When tightening the nut member and pulling the conical plug into the expansion sleeve to expand the expansion sleeve,
There is the inconvenience that the expansion sleeve and the anchor body rotate together with the nut member and the conical plug cannot be drawn into the expansion sleeve. In particular, when it is used to fix a hanging bolt to a concrete ceiling wall, the nut member must be tightened with the fixing point at a high place and in an upward state, which makes the work difficult and causes the inconvenience caused by the co-rotation described above. There is a problem that is likely to occur.

The present invention has been made for the purpose of solving such problems, and it is possible to surely prevent co-rotation of the anchor body when tightening the nut member of the expansion anchor, and tighten the nut member. Provide an expansion anchor that can be easily operated.

[0005]

In order to achieve the above object, the present invention provides an anchor body having a conical plug at the tip of a screw rod with a plurality of split grooves extending axially on the tip side of the anchor body. In the expansion anchor of the type in which the expansion sleeve that can be opened is fitted, and the conical plug is drawn into the expansion sleeve by tightening the nut member screwed from the base end side of the screw rod, the conical plug Is provided with a detent protrusion that engages with the split groove of the expanding sleeve, and a detent claw is provided on the outer peripheral surface of the expanding sleeve on the base end side. .

Further, a long nut is used as the nut member,
Another screw hole is provided on the opposite side of the screw hole screwed to the screw rod of the anchor body, and a long suspension bolt is screwed and fixed to the screw hole to form a spreading anchor with a suspension bolt. In addition,
Instead of the suspension bolt, another mounting member may be screwed and fixed. Further, another member may be directly connected to or attached to the nut member. Furthermore, a long nut made of resin may be used as the nut member.

[0007]

With the above structure, when the expanding anchor is inserted into the mounting hole formed in the structure such as concrete, the detent claws provided on the expanding sleeve are bite and fixed in the peripheral edge portion of the inlet of the mounting hole. It When the nut member is tightened in this state, the anchor body is locked to the expansion sleeve through the rotation stop protrusion provided on the conical plug, so that when the nut member is tightened, the anchor body does not move. There is no turning around. Further, when the expansion anchor with the hanging bolt is used as described above, the nut member can be tightened through the hanging bolt, which is convenient when the fixing point is a high place such as a concrete ceiling wall. .

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example in which the present invention is applied to an expansion anchor with a hanging bolt, FIG. 2 is an enlarged cross-sectional view showing a main part of a conical plug of the anchor body, and FIG. 3 is a base end side of an expansion sleeve. It is an end view.

As with the conventional product, the expansion anchor 1 itself has an anchor body 2 having a conical plug 4 that expands toward the tip of the screw rod 3, and an anchor body 2 that is fitted to the anchor body 2 and is axially attached to the tip side. The expansion sleeve 5 is provided with a plurality of split grooves 6 extending inward and can be expanded, and a nut member 7 screwed from the base end side of the screw rod 3 to the expansion sleeve 5. A long nut is used as the nut member 7, and a long hanging bolt 10 is screwed and fixed in a large diameter screw hole 9 provided on the opposite side of the screw hole 8 screwed into the screw rod 3 It is an open anchor.

On the outer surface of the conical plug 4, a plurality of detent projections 11 that engage with the split grooves 6 of the expanding sleeve 5 are integrally provided. As shown in FIG. 2, the anti-rotation protrusion 11 has a mountain-shaped cross-section, the highest point is near the screw rod 3, gradually lowers toward the tip, extends axially, and converges near the tip. There is. On the other hand, the split groove 6 of the expanding sleeve 5
A chamfered portion 12 having an outward expansion is provided at the tip of the so as to facilitate the engagement of the rotation preventing projection 11. Further, a plurality of detent claws 13 protruding in the radial direction are formed on the outer peripheral surface of the expanding sleeve 5 on the base end side (FIG. 3).
reference).

FIG. 4 shows the construction sequence of the expansion anchor with a suspension bolt constructed as described above. Figure 4
As shown in (a), a mounting hole 21 is made in the concrete ceiling wall 20 with a drill 31 mounted on the electric rotating tool 30.
The hole diameter of the mounting hole 21 is slightly larger than the outer diameter of the expanding sleeve 5. Next, the bolt tightening tool 32 is attached to the electric rotating tool 30, the end of the hanging bolt 10 is gripped and fixed by the bolt tightening tool 32, and the expansion anchor 1 at the tip is inserted into the mounting hole 21. And the nut member (long nut) 7
Expansion anchor 1 until the end contacts the inlet end face of the mounting hole 21
4B, as shown in FIG. 4B, the detent claw 13 of the expanding sleeve 5 bites into the peripheral edge portion of the inlet of the mounting hole 21 and is temporarily fixed. When the electric rotating tool 30 is operated in this state and the hanging bolt 10 is rotated through the tightening tool 32, the nut member (long nut) 7 connected and fixed to the hanging bolt 10 rotates, and the screw hole 8 is formed. The screw rod 3 that is screwed moves to the suspension bolt 10 side. The conical plug 4 is drawn into the expansion sleeve 5 by the axial movement of the screw rod 3, and the expansion sleeve 5 is expanded to attach the mounting hole 21.
It is fixed to the wall surface of, and the construction is completed (see FIG. 4C). At this time, since the conical plug 4 is pulled into the expanding sleeve 5 with the detent projection 11 engaged with the split groove 6, the detent projection 11 is locked to the side edge of the split groove 6. become. Therefore, the screw rod 3 does not rotate together with the nut member (long nut) 7, and the conical plug 4 is reliably pulled in to fully expand the expanding sleeve 5 and a large holding force is obtained.

FIG. 5 shows an embodiment in which a fitting 14 for a gutter is connected and fixed to the nut member 7 of the expansion anchor 1 instead of the suspension bolt 10. In this case, the expanding anchor 1 is fixed to the concrete wall 22 by rotating the nut member 7 via the mounting member 14 in the same manner as the construction procedure shown in FIG.

In FIG. 6, a long nut 15 made of resin is used as a nut member screwed to the screw rod 3, and a concrete wall 22 is used.
An example in which a wooden board 24 is attached and fixed via a heat insulating material 23 is shown. The long nut 15 has a screw hole 16 which is screwed into the threaded rod 3 at one end and a screw hole 17 into which a stop bolt 18 is screwed at the other end. Then, by rotating the long nut 15 screwed to the screw rod 3 in a state of being in contact with the concrete wall 22, the screw rod 3 is pulled in and the expansion sleeve 5 is expanded by the conical plug 4, and the concrete wall 22 is expanded. Stick to it. On the other hand, the set bolt 18 for fixing the wooden board 24 is screwed into the screw hole 17.

The nut member 7 screwed onto the threaded rod 3 is not limited to the long nut shown in the above embodiment, but may have various shapes corresponding to the member attached via the expansion anchor 1. Is possible.

[0015]

As described above, the expansion anchor according to the present invention is provided with the detent protrusion that engages with the split groove of the expansion sleeve on the outer surface of the conical plug of the anchor body, and the expansion is performed. Since the rotation stopping claw is provided on the outer peripheral surface of the base end side of the sleeve, it is possible to surely prevent co-rotation of the anchor main body when tightening the nut member screwed into the screw rod of the anchor main body, and tighten the nut member. Work can be done easily.

Further, a long nut is used as the nut member,
If another screw hole is provided on the opposite side of the screw hole screwed to the screw rod of the anchor body, and a long suspension bolt is screwed and fixed to the screw hole to form an expansion anchor with a suspension bolt, Since the long nut can be tightened by using a bolt, it is particularly effective when the fixing point is a high place such as a concrete ceiling wall.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a main part of a spreading anchor with a hanging bolt according to the present invention.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged view of an end surface of the expanding sleeve.

FIG. 4 is an explanatory view showing the construction procedure.

FIG. 5 is a longitudinal sectional view of a main part showing a usage state according to another embodiment.

FIG. 6 is a longitudinal sectional view of an essential part showing a usage state according to still another embodiment.

[Explanation of symbols]

 1 Expansion Anchor 2 Anchor Main Body 3 Screw Rod 4 Conical Plug 5 Expansion Sleeve 6 Split Groove 7 Nut Member (Long Nut) 8, 9 Screw Hole 10 Suspension Bolt 11 Locking Protrusion 13 Rotation Claw 14 Mounting Bracket 15 Resin Long nut 16,17 screw hole

Claims (4)

[Claims] 1. An expansion main body having a conical plug at the tip of a screw rod is fitted with an expansion sleeve having a plurality of split grooves extending in the axial direction on the distal end side so as to be expandable. In an expansion anchor of a type in which the conical plug is pulled into the expansion sleeve by tightening a nut member screwed from the base end side, a rotation engaging an outer surface of the conical plug with a split groove of the expansion sleeve. An expanding anchor, wherein a stop projection is provided, and a rotation stopping claw is provided on the outer peripheral surface of the expanding sleeve on the base end side. 2. The expansion anchor according to claim 1, wherein the nut member is a long nut, and another screw hole is provided on the opposite side of the screw hole screwed into the screw rod. 3. The expansion anchor according to claim 1, wherein a mounting member such as a hanging bolt is connected to the nut member. 4. The nut member is a resin long nut,
The expansion anchor according to claim 2, wherein another screw hole is provided on the opposite side of the screw hole screwed into the screw rod.