JP2598805Y2 - Metal extension anchor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal expansion anchor.

[0002]

2. Description of the Related Art A metal expansion anchor is a type of "post-installed anchor" to be retrofitted to concrete or the like. When a bolt or the like is retrofitted to a base material such as concrete, a metal member having an expanded portion is attached. An anchor that is inserted into a pre-drilled hole to a predetermined depth, and its expanded portion is opened by hitting or rotating and then mechanically fixed by cutting into the concrete hole wall.

A metal expansion anchor in the prior art is typically an anchor bolt described in Japanese Patent Publication No. 59-30925. This anchor is of a double cone type, in which a screw shaft is rotated to pull up a cone nut mounted on the distal end of an expansion sleeve, and at the same time, a cone member is press-fitted from the opposite side to expand the sleeve in parallel.

[0004] The expansion sleeve forms a thin portion in the middle, the cone member is formed adjacent to the thin portion, and an axial direction applied to the sleeve when the cone nut is pulled up by rotation of the screw shaft. The thin portion is cut using force. However, in some cases, the sleeve can be cut from the thin portion only by pulling up the cone nut, but the cone member cannot be pressed into the expansion sleeve.

In order to solve this drawback, in the above-mentioned prior art, a supporter for forming a gap between a nut or bolt head and a concrete surface is provided at a base end of a screw shaft protruding from a sleeve, and the thin wall portion is provided. At the same time as cutting the supporter, remove the supporter and continue the rotation of the screw shaft to bring the nut or bolt head closer to the concrete surface, thereby pressing the cone member into the expansion sleeve and fixing the expansion sleeve to the concrete hole wall. Was.

On the other hand, the surface of a concrete skeleton on which an anchor is to be installed is often not flat, and when a component to be mounted is mounted on concrete, a gap may be formed between the component and the concrete. If this gap is left unattended, the attached object may become loose. Therefore, after the expansion sleeve is fixed to the concrete hole wall, a technology to shorten the entire length of the sleeve has been developed.
It is published in Japanese Patent Publication No. 1-485.

[0007] The above-mentioned conventional invention is an anchor of a type called a cone nut type which is a metal expansion anchor but expands only one end of the expansion portion. For this reason, at the time of anchoring, after the expansion part is fixed to the concrete hole wall by rotating the bolt, an axial force is applied to the bolt but no force is applied to the sleeve. Therefore, in the present invention, the sleeve main body and the expansion sleeve having the slit formed from the opening end are cut in advance, and the stepped sleeve is inserted between them. The stepped sleeve is easily deformed by the axial force.If there is a gap between the mounting object and the concrete surface, the bolt continues to rotate and the sleeve is The sleeve is deformed by applying force to shorten the length of the sleeve.

In the prior art, a sleeve for adjusting the length called a stepped sleeve is deformed, so that it is suitable for a cone nut type anchor. There is a problem that it is not suitable for the cone type.

[0009]

The problem to be solved by the present invention is to solve the problem of an anchor of the double cone type, in which the cone member is cut during the anchoring work, between the object to be mounted and the concrete surface after the anchoring work. An object of the present invention is to provide a metal expansion anchor in which the gap is eliminated by reducing the length of the sleeve when a gap is formed therebetween.

[0010]

Means for solving the problem in the present invention is to provide a thin-walled cut portion 3 formed by cutting the inner and outer peripheral surfaces in the middle of the sleeve to form the main sleeve 1 and to form the thin-walled cut portion 3. The cone sleeve 4 has one part formed on the cone sleeve 4 and the other part formed on the expansion sleeve 5.
And an outer peripheral insertion portion 7 which is continuous with the outer peripheral tapered portion 6 and has a smaller diameter than the outer diameter of the cone sleeve 4, and an outer peripheral portion of the cone sleeve 4 is provided at a portion of the expansion sleeve 5 adjacent to the thin cut portion 3. An inner peripheral receiving portion 8 having a diameter smaller than that of the insertion portion 7, one first slit 10 extending in the axial direction from the distal end to the thin cut portion 3 in the expansion sleeve 5, and the first slit 10. And one or more second slits 11 extending from the distal end of the expansion sleeve 5 to immediately before the thin-walled cut portion 3, and the main sleeve 1 is provided with a headed bolt 1 from the cone sleeve 4 side.
3 is inserted, and a cone nut 18 is screw-coupled to a threaded portion of the bolt projecting from the distal end of the expansion sleeve 5.

[0011]

The anchor is inserted into the hole 21 formed in the concrete body 20 via the attachment 22. By the rotation of the bolt 13, the cone nut 18 is pulled up toward the base end, the tip of the expansion sleeve 5 is expanded, and a force is applied to the main sleeve 1 from both ends toward the thin cut portion 3. The main sleeve 1 is cut from the thin cut portion 3 to form a hole 2
The expansion sleeve 5 cuts into the hole wall of the first hole, and the anchor is fixed to the concrete frame 20.

If there is a gap 23 between the object 22 and the concrete body 20, the bolt 13 is further rotated to allow the tip of the cone sleeve 4 to enter the expansion sleeve 5 to shorten the overall length of the sleeve. At the same time, the base end of the expansion sleeve 5 is expanded. Therefore, the attachment 22 can be fixed to the concrete skeleton 20 without any gap.

[0013]

1, 2 and 3, a sleeve constituting an anchor comprises a main sleeve 1 and an auxiliary sleeve 2, and the length of the entire sleeve is changed by appropriately selecting the length of the auxiliary sleeve 2. Can be adjusted. However, it is free to form the main sleeve 1 and the auxiliary sleeve 2 integrally.

The main sleeve 1 is provided with a thin-walled cut portion 3 formed by shaving the inner and outer peripheral surfaces on the way, one of which is formed as a cone sleeve 4 and the other is formed as an expansion sleeve 5 adjacent to the thin-walled cut portion 3. An outer peripheral taper portion 6 having a smaller diameter toward the thin-walled cut portion 3 is formed on the outer peripheral surface of the cone sleeve 4 connected to the thin-walled cut portion 3, and is continuous with the outer peripheral taper portion 6 and outside the cone sleeve 4. An outer peripheral insertion portion 7 having a smaller diameter than the diameter is formed. In addition, expansion sleeve 5
The inner peripheral surface of the connecting portion with the thin cut portion 3 is formed with an outer peripheral insertion portion 7 of the cone sleeve 4 and an inner peripheral receiving portion 8 having a small diameter.

Therefore, when the thin cut portion 3 is cut, the outer peripheral tapered portion 6 of the cone sleeve 4 is pushed into the inner peripheral receiving portion 8 of the expansion sleeve 5. The inner peripheral surface of the distal opening of the expansion sleeve 5 is formed with a distal tapered portion 9 having a larger diameter toward the opening. The expansion sleeve 5 is provided with three slits 10 and 11 parallel to the axial direction from the distal end opening. Of these, the slit reaching the thin cut portion 3 is the first slit 10, and the other two are the other. The inner slit receiving portion 8 is in phase with the first slit 10 at 120 °.
Is a second slit 11. In addition,
A knurled portion 12 is formed on the outer peripheral surface of the distal end of the expansion sleeve 5.

Reference numeral 13 denotes a headed bolt inserted into the main sleeve 1 and the auxiliary sleeve 2, and is inserted into the hexagonal head 14 at the base end from the opening of the auxiliary sleeve 2 through the flat washer 15 and the cap-shaped dome washer 16. Then, the screw shaft 17 at the distal end projects from the opening at the distal end of the expansion sleeve 5, and the cone nut 18 is screwed to the screw shaft, and the cone nut 1
8 is in contact with the distal end tapered portion 9 of the expansion sleeve 5.

Next, the construction of the anchor of the embodiment will be described with reference to FIG. Drill a hole 21 in the concrete skeleton 20,
An anchor is inserted into the hole 21 through the attachment 22,
Next, the bolt 13 is rotated by the hexagonal head 14. The rotation of the bolt 13 raises the cone nut 18 toward the base end, and the distal end of the expansion sleeve 5 is expanded. When the rotation of the bolt 13 is continued, the dome washer 16 is crimped and gradually deforms flat, so that a force is applied to the main sleeve 1 from the both ends toward the thin cut portion 3 via the auxiliary sleeve 2.

When the dome washer 16 is deformed into a flat washer similarly to the flat washer 15, the main sleeve 1 is cut from the thin cut portion 3 and the outer tapered portion 6 of the cone sleeve 4 is expanded as shown in FIG. The extension sleeve 5 enters the inner peripheral receiving portion 8 of the sleeve 5, so that the width of the groove of the first slit 10 is increased, and the distal end portion is expanded by the entry of the cone nut 18, and the expanded sleeve 5 The anchor is fixed to the concrete skeleton 20 with the expansion sleeve 5 digging into it.

After the anchor is installed, if a gap 23 is formed between the object 22 and the concrete frame 20, as shown in FIG. 5, the bolt 13 is further rotated. In FIG. 4, the anchor is fixed to the concrete hole wall, but since the base end of the expansion sleeve 5 does not reach the step of the outer peripheral insertion portion 7 of the cone sleeve 4, when the bolt 13 is rotated in the state of FIG. The outer peripheral insertion portion 7 of the cone sleeve 4 enters the expansion sleeve 5, so that the entire length of the sleeve is reduced while the expansion sleeve 5 is kept in a constant expanded state. Therefore, the gap 23 generated between the attachment 22 and the concrete skeleton 20 is eliminated, and the attachment 22 can be fixed to the concrete skeleton 20 without any gap.

In FIG. 4, the expansion sleeve 5 is cut from the thin cut portion 3 and fixed to the hole wall. However, only one of the first slits 10 is cut off at the base end of the expansion sleeve 5. The expansion sleeve 5 maintains the shape of the cylindrical body.

[0021]

According to the present invention, one main sleeve is formed as a cone sleeve and the other is formed as an expansion sleeve via a thin-walled cut portion. An outer peripheral taper portion and an outer taper portion are formed at a portion of the cone sleeve adjacent to the thin-wall cut portion. Since it is provided with an outer peripheral insertion portion that is continuous to the part and formed with a smaller diameter than the outer diameter of the cone sleeve, when a gap is generated between the attached object and the concrete skeleton after anchoring,
By further rotating the bolts inserted through the sleeve, the outer peripheral insertion portion of the cone sleeve can be pushed into the expansion sleeve while the expansion sleeve remains in a constant expanded state, thereby reducing the overall length of the sleeve. There is an effect that the attachment can be fixed to the concrete frame without any gap.

[Brief description of the drawings]

FIG. 1 is an assembled perspective view.

FIG. 2 is a partially broken side view.

FIG. 3 is a perspective view of a main sleeve.

FIG. 4 is a sectional view showing a construction state.

FIG. 5 is a cross-sectional view illustrating a state where a gap has been formed between the object and the concrete body when the object is fixed.

[Description of Signs] 1 main sleeve 2 auxiliary sleeve 3 thin cut section 4 cone sleeve 5 expansion sleeve 6 outer taper section 7 outer insert section 8 inner circumference receiving section 9 tip taper section 10 first slit 11 second slit 12 knurl processing section 13 bolt 14 hexagonal head 15 flat washer 16 dome washer 17 screw shaft 18 cone nut

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuyoshi Hosokawa 1-24-10 Higashi-Nippori, Arakawa-ku, Tokyo Inside Miyuki Trading Co., Ltd. (72) Katsuyuki Sato 1-24-10 Higashi-Nippori, Arakawa-ku, Tokyo In Sanko Industry Co., Ltd. (56) References JP-A-51-83959 (JP, A) JP-A-48-44657 (JP, A)

Claims (2)

(57) [Scope of request for utility model registration] 1. A provided thin cut portions obtained by forming scraping inner and outer peripheral surfaces in the middle of the sleeve using the tubular member (3) forming a main sleeve (1), Sri adjacent to said thin cutting unit (3)
Use the cone sleeve (4) with the shaved outer peripheral surface
A portion obtained by shaving and forming the inner peripheral surface is formed as an expansion sleeve (5), and an outer peripheral taper portion (6) and an outer peripheral taper portion (6) are formed in a portion of the cone sleeve (4) adjacent to the thin cut portion (3). ) To form an outer peripheral insertion portion (7) which is smaller than the outer diameter of the cone sleeve (4)
The thin cut portion (3) in the expansion sleeve (5)
The inner sleeve receiving portion (8) having a smaller diameter than the outer circumferential insertion portion (7) of the cone sleeve (4) is formed in a portion adjacent to the above, and the thin cut portion (3) is formed on the expansion sleeve (5) from the front end portion.
One first slit (10) leading to and along the axial direction
And one or more second slits (11) having a phase different from that of the first slit (10) and extending from the distal end of the expansion sleeve (5) to immediately before the thin cut portion (3).
A headed bolt (13) is inserted through the main sleeve (1) from the cone sleeve (4) side, and a cone nut (18) is screwed into a threaded portion of the bolt protruding from the tip of the expansion sleeve (5). A metal expansion anchor, characterized in that it is joined. 2. A sleeve comprising a main sleeve (1) and an auxiliary sleeve (2), wherein a cone sleeve (4) and an expansion sleeve (5) are formed in the main sleeve (1), and the auxiliary sleeve (2) is formed. 2. The metal expansion anchor according to claim 1, wherein the length of the entire sleeve can be adjusted by appropriately selecting the length.