JPH04111909U - metal expansion anchor - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a metal expansion anchor that can eliminate a gap that exists between an object to be attached and a concrete surface after anchor construction. [Structure] A main sleeve 1 is formed into a cone sleeve 4 on one side and an expansion sleeve 5 on the other through a thin cut portion 3, and an outer peripheral insertion portion 7 is provided in the cone sleeve 4 adjacent to the thin cut portion 3 to expand the sleeve. The sleeve 5 is provided with an inner periphery receiving portion 8, a plurality of slits 10, 11 are formed in the expansion sleeve 5 from the tip opening, a threaded shaft is inserted into the main sleeve 1, and a cone nut 18 is screwed to the threaded shaft. is attached to the opening of the expansion sleeve 5.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a metal expansion anchor.

0002

[Conventional technology]

Metal expansion anchors are used as post-installation anchors that are attached to concrete, etc. This is a type of extension when attaching bolts, etc. to a base material such as concrete. Insert the metal member into the pre-drilled hole to a specified depth, and then hit or rotate it. By tightening, the extension opens and bites into the concrete hole wall. An anchor that is mechanically fixed.

0003 The metal expansion anchor in the prior art is disclosed in Japanese Patent Publication No. 59-30925. Anchor bolts are a typical example. This anchor is a double cone type , rotate the screw shaft and pull up the cone nut attached to the tip of the expansion sleeve. At times, a cone member is press-fitted from the opposite side to expand the sleeve in parallel. be.

0004 The expansion sleeve forms a thin wall part in the middle, and the cone member is placed adjacent to the thin wall part. When the cone nut is pulled up by rotating the screw shaft, The thin wall section is cut using the axial force applied to the sleeve. but However, the sleeve cannot be cut from the thin section with just the force of pulling up the cone nut. Although it can be cut, the cone member cannot be press-fitted into the expansion sleeve. Something happened.

[0005] In order to solve this drawback, in the above-mentioned conventional technology, the base of the screw shaft protruding from the sleeve is Supporter at the end that forms a gap between the nut or bolt head and the concrete surface At the same time as cutting the thin section, remove the supporter and rotate the screw shaft. Continue rolling to bring the nut or bolt head closer to the concrete surface. This allows the cone member to be press-fitted into the expansion sleeve and the expansion sleeve to be concreted. It was stuck to the hole wall.

[0006] On the other hand, the surface of the concrete structure on which anchors are installed is often not flat. When the mounted part is attached to concrete, the connection between the mounted part and the concrete is There may be gaps between them. If this gap is left unattended, the object to be attached may become loose. After fixing the expansion sleeve to the concrete hole wall, do not completely remove the expansion sleeve. A technique was developed to shorten the length of the body, and the technique was published in Japanese Patent Publication No. 61-485. represented.

[0007] Although the above invention is a metal expansion anchor, the cone expands only one end of the expansion part. This is a type of anchor called a nut type. Therefore, when installing anchors, After the extension is fixed to the concrete hole wall by rotating the A force is applied in the direction, but no force is applied to the sleeve. Therefore, the issue Specifically, the main body of the sleeve and the expansion sleeve with a slit formed from the open end are cut in advance. A stepped sleeve is inserted between the sections. The stepped sleeve above is It deforms easily in response to axial force, and as mentioned above, it does not connect with the object to which it is attached. If there is a gap between the concrete surface and the concrete surface, keep rotating the bolt to prevent slipping. The length of the sleeve is shortened by applying an axial force to the sleeve to deform it.

[0008] In the above conventional technology, the sleeve for length adjustment called a stepped sleeve is deformed. Sleeve length adjustment function The problem is that it is not suitable for the double cone type because it does not have an expansion function. There is.

[0009]

[Problem that the idea aims to solve]

The problem that this invention aims to solve is that it is a double cone type, and the cone member is unlatched. For anchors that are cut during car construction, the connection with the attached object after the anchor construction is If there is a gap between the sleeve and the concrete surface, shorten the length of the sleeve to To provide a metal expansion anchor that can eliminate gaps. .

0010

[Means to solve the problem]

In order to solve the problem in the present invention, the cone member is inserted from both ends of the sleeve. It is a press-fit double cone type, and the cone member is cut during anchor construction. At the anchor, connect the main sleeve to the cone sleeve through the thin cut section. one side is formed into an expansion sleeve and adjacent to the thin cut portion in the cone sleeve. The cone sleeve is connected to the outer circumferential tapered portion and the cone sleeve is connected to the outer circumferential tapered portion. An outer peripheral insertion portion is formed to have a smaller diameter than the outer diameter of the expansion sleeve. The inner peripheral surface of the connecting part with the thin cut part is shaped to have a smaller diameter than the outer peripheral insertion part of the cone sleeve. In addition to providing an inner periphery receiving section with a A plurality of slits are formed along the main sleeve, and the screw shaft is inserted into the main sleeve, and the screw shaft is inserted into the main sleeve. A cone nut screwed to the shaft is attached to the opening at the tip of the expansion sleeve. It is characterized by:

[0011]

[Effect]

The anchor is inserted into the hole 21 drilled in the concrete frame 20 through the object to be attached 22. insert. As the bolt 13 rotates, the cone nut 18 is pulled up toward the base end. The tip of the expansion sleeve 5 is expanded, and the main sleeve 1 is opened from both ends. A force is applied toward the thin cut section 3. The main sleeve 1 is cut from the thin cut section 3. The expansion sleeve 5 bites into the hole wall of the hole 21, and the anchor is attached to the concrete frame. 20.

0012 If there is a gap 23 between the object 22 and the concrete frame 20, Further rotate the bolt 13 to insert the tip of the cone sleeve 4 into the expansion sleeve 5. The total length of the expansion sleeve is shortened and at the same time the proximal end of the expansion sleeve 5 is expanded. child Therefore, the attached object 22 can be fixed to the concrete frame without any gaps. .

[0013]

【Example】

In Figures 1, 2, and 3, the sleeves constituting the anchor are the main sleeve 1 and the auxiliary sleeve. It consists of a sleeve 2, and by appropriately selecting the length of the auxiliary sleeve 2, it is possible to The entire length of the tube can be changed and adjusted. However, the above main sleeve 1 and auxiliary sleeve 2 You are free to form them in one piece.

[0014] The main sleeve 1 has a thin cut part 3 formed by cutting the inner and outer peripheral surfaces in the middle. Adjacent to the meat cutting part 3, one side is formed into a cone sleeve 4 and the other side is formed into an expansion sleeve 5. ing. The outer circumferential surface of the connecting portion of the cone sleeve 4 with the thin cut portion 3 is as follows: An outer circumferential tapered portion 6 having a smaller diameter toward the thin cut portion 3 is provided, and An outer portion continuous with the circumferential tapered portion 6 and formed with a smaller diameter than the outer diameter of the cone sleeve 4. A circumferential insertion portion 7 is provided. Further, the thin cut portion of the expansion sleeve 5 The inner peripheral surface of the connecting part with the cone sleeve 4 has a smaller diameter than the outer peripheral insertion part 7 of the cone sleeve 4. A receiving section 8 is provided.

[0015] Therefore, if the thin cut portion 3 is cut, the outer circumferential tapered portion of the cone sleeve 4 6 is adapted to be pushed into the inner peripheral receiving portion 8 of the expansion sleeve 5. Also, the above The inner circumferential surface of the distal opening of the expansion sleeve 5 has a tapered tip whose diameter increases toward the opening. 9 is provided. In addition, the expansion sleeve 5 has a section parallel to the axial direction from the tip opening. Three slits 10 and 11 are provided, of which the thin cut section 3 has three slits 10 and 11. The slit reaching the end is the first slit 10, and the other two are the first slits 10 and 1. A slit with a phase of 20° and reaching the inner peripheral receiving portion 8 is defined as a second slit 11. ing. Note that a knurled portion 12 is formed on the outer peripheral surface of the distal end of the expansion sleeve 5. are doing.

[0016] 13 is a bolt inserted into the main sleeve 1 and the auxiliary sleeve 2, and the bolt is inserted into the main sleeve 1 and the auxiliary sleeve 2. The above-mentioned auxiliary screw is attached to the hexagonal head 14 via a flat washer 15 and a cap-shaped dome washer 16. Insert through the opening of the sleeve 2, and insert the screw shaft 17 at the tip into the tip of the expansion sleeve 5. The cone nut 18 protrudes from the opening and is screwed to the tip of the screw shaft. A cone nut 18 is brought into contact with the tapered end portion 9 of the expansion sleeve 5.

[0017] Next, construction of the anchor of the example will be explained with reference to FIG. Concrete frame 20 A hole 21 is drilled, an anchor is inserted into the hole 21 through the object 22, and then , the bolt 13 is rotated by the hexagonal head 14. By rotating the bolt 13, the cone The nut 18 is pulled up toward the base end, and the distal end of the expansion sleeve 5 is expanded. . Then, as the bolt 13 continues to rotate, the dome washer 16 is crimped and gradually The main sleeve 1 is deformed flat, and therefore the main sleeve 1 is thinned from both ends through the auxiliary sleeve 2. Force is applied toward the meat cutting section 3.

[0018] When the dome washer 16 is transformed into a flat washer in the same way as the flat washer 15 As shown in Fig. 4, the main sleeve 1 is cut from the thin cut section 3 to form a cone sleeve. The outer circumferential tapered part 6 of 4 enters into the inner circumferential receiving part 8 of the expansion sleeve 5, so that In the expansion sleeve 5, the groove width of the first slit 10 is expanded and the cone nut is expanded. As the tip 18 enters, the tip part is expanded, and the expansion sleeve 5 bites into the hole wall of the hole 21. Once inserted, the anchor is fixed to the concrete frame 20.

[0019] After anchor construction, as shown in Fig. 5, the attached object 22 and concrete frame 20 are separated. If there is a gap 23 between them, the bolt 13 is further rotated. Figure 4 Smell The anchor is fixed to the concrete hole wall, but the base end of the expansion sleeve 5 is Since the stepped part of the outer circumferential insertion part 7 of the cone sleeve 4 has not been reached, the bolt should be removed in the state shown in Figure 4. When the shaft 13 is rotated, the outer peripheral insertion portion 7 of the cone sleeve 4 enters the expansion sleeve 5. Therefore, the length of the entire sleeve is shortened while the expansion sleeve 5 remains in a constant expanded state. be done. Therefore, a gap 23 is created between the object 22 and the concrete frame 20. has been resolved, and the object 22 to be attached can be fixed to the concrete frame 20 without any gaps. It is possible to do this.

[0020] In addition, 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 at the proximal end of the expansion sleeve 5. Since they are only separated, the expansion sleeve 5 maintains its shape as a cylinder. There is.

[0021]

[Effect of the idea]

This invention is a double cone type in which the cone member is cut during anchor construction. In this anchor, one side of the main sleeve is connected to the cone sleeve through the thin cut section. The other end is formed into an expansion sleeve and is adjacent to the thin cut portion in the cone sleeve. There is an outer circumferential tapered part in the part where the cone sleeve is continuous with the outer circumferential tapered part and the cone sleeve The outer diameter of the anchor is smaller than the outer diameter of the anchor. If there is a gap between the object to be installed and the concrete frame later, By further rotating the inserted bolt, the expansion sleeve will be expanded to a certain extent. The outer circumferential insertion portion of the cone sleeve is pushed into the expansion sleeve while The overall length of the sleeve can be shortened, and the object to be attached can be attached to a concrete frame. This has the effect of being able to be fixed without any gaps.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the entire assembly.

FIG. 2 is a partially cutaway side view.

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

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

FIG. 5 is a sectional view showing a state where a gap is created between the object and the concrete frame when the object is fixed.

[Explanation of symbols]

1 Main sleeve 2 Auxiliary sleeve 3 Thin cut section 4 Corn sleeve 5 Expansion sleeve 6 Outer periphery taper part 7 Outer insertion part 8 Inner circumference receiving part 9 Tip tapered part 10 First slit 11 Second slit 12 Knurling section 13 volts 14 Hexagonal head 15 Flat washer 16 Dome washer 17 Screw shaft 18 Corn nut

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Kazuyoshi Hosokawa 3-1-24-10 Higashi Nippori, Arakawa-ku, Tokyo Within Sachi Shoji Co., Ltd. (72) Creator Katsuyuki Sato 3-1-24-10 Higashi Nippori, Arakawa-ku, Tokyo Inside Saiwai Kogyo Co., Ltd.

Claims (2)

[Scope of utility model registration request] Claim 1: In a double cone type anchor in which cone members are press-fitted from both ends of the sleeve, and the cone member is cut during anchor construction, one main sleeve is inserted into the cone sleeve through a thin cut portion, and the other is inserted into the cone sleeve. formed into an expansion sleeve, an outer circumferential tapered part and an outer circumferential insertion part continuous with the outer circumferential tapered part and formed to have a smaller diameter than the outer diameter of the cone sleeve are provided in a portion of the cone sleeve adjacent to the thin cut part, and the above-mentioned An inner peripheral receiving part is provided in which the inner peripheral surface of the connecting part of the expansion sleeve with the thin cut part is formed to have a smaller diameter than the outer peripheral insertion part of the cone sleeve, and a plurality of slits are provided in the expansion sleeve along the axial direction from the distal end opening. A metal expansion anchor characterized in that a screw shaft is inserted into the main sleeve, and a cone nut screwed to the screw shaft is attached to the opening at the distal end of the expansion sleeve. 2. The expansion sleeve includes a first slit parallel to the axial direction and extending over the entire length;
A phase difference is provided between the slits, and one or more second slits are provided halfway from the distal end of the expansion sleeve, and the first slit extends from the distal opening of the expansion sleeve to the thin cut section. 2. The metal expansion anchor according to claim 1, wherein the second slit is provided from the opening to the inner peripheral receiving portion.