JP3185097B2 - Inserts and how to attach them - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert and a method for mounting the insert.

[0002]

2. Description of the Related Art A fixture called an insert is used to attach another component or member to a structure such as a concrete structure that cannot be welded. This is generally done by embedding a nut-shaped part in the concrete surface when casting concrete. After the mold is disassembled, the end face of the nut is exposed on the concrete surface, so a bolt is screwed into the nut and used.

[0003]

The above-mentioned conventional insert and its mounting method have the following problems. <A> Since the conventional insert is made of metal, there is a possibility that it will be corroded by long-term use. Then, there is a risk that members (piping, signboard, etc.) attached via bolts may fall off. <B> Ceramic inserts have been manufactured to cope with such corrosion. A ceramic insert has advantages such as being not corroded and being hardly damaged in a fire. However, ceramics have a low resistance to tensile force as compared with metal, and on the other hand, a large tensile force acts on the insert from the attached bolt, so that there was a problem in practical use. <C> When attaching to a newly constructed structure, etc., the above-mentioned attachment is possible, but the phenomenon that the metal insert is about to corrode in the already constructed existing structure etc. It has occurred. In this case, a method of replacing the corroded insert with a new insert or a method of newly installing the insert on an existing structure has not yet been established.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an insert which can sufficiently resist a pulling force and can withstand practical use. Another object of the present invention is to provide an attachment method that allows such an insert to be replaced with an old one or to be easily and securely attached to an existing structure or the like.

[0005]

In order to achieve the above-mentioned object, an insert of the present invention is a cylindrical body entirely formed of ceramics, and has a through hole formed therein through which a bolt is screwed. The outer circumference is formed with a plurality of portions of the same diameter having the same diameter, and in the middle of the portions having the same diameter,
The insert features a reduced diameter that gradually decreases from the diameter of the same diameter part and then expands again to reach the same diameter as the same diameter part, and a cutout is formed in part of the same diameter part. It was done.

Further, in the method of mounting an insert according to the present invention, a screw is cut into the tip, a hollow injection tube is used, and a screw portion at the tip of the injection tube is screwed into the screw hole of the insert. And drilling a concrete structure, etc., insert the insert at the tip of the injection cylinder into this drilling, close the opening of the drilling hole leaving the exhaust port, and fill the filler through the injection cylinder. It is characterized by a method of mounting an insert, which is performed by injection.

Furthermore, the mounting method of the insert of the present invention, the screw holes of the above-described insert, note from one side
Screw the fixing bolts together with a closing plate that opens the inlet and exhaust ports , integrate them, screw in the anchor bolts from the other side of the screw holes and integrate them, drill a concrete structure, etc. , Insert the insert to the bottom of the hole with the anchor bolt, close the opening of the drill hole with a closing plate,
The present invention is characterized by a method of attaching an insert, in which a filler is injected into a hole from an injection port opened in a closing plate.

[0008]

Embodiments of the present invention will be described below with reference to the drawings with reference to an embodiment of an insert of the present invention and a method of attaching the insert to an existing structure.

[0009]

[Shape of Insert] First, the shape of the insert 1 of the present invention will be described.

<A> Overall shape. The overall shape of the insert 1 of the present invention is a cylindrical body,
The whole is made of ceramics. In the inside of the cylinder, there is a screw hole 1 for screwing a bolt in parallel with the center axis of the cylinder.
1 through. The range in which the screw is engraved may be the entire range or a part.

<B> Same diameter portion and throttle portion. The outer periphery has two identical diameter portions 12 having the same diameter.
In the middle of the same-diameter portion 12, there is formed a narrowed portion 13 whose diameter gradually decreases from the diameter of the same-diameter portion 12, expands again, and reaches the same diameter as the same-diameter portion 12. Therefore, it is formed in a so-called drum shape. Although the above description has been given of the case where the same-diameter portion 12 is formed in two places,
2 need not be two places, but can be arranged at three places or more as shown in FIG.

<C> Non-circular portion. Further, a cutout surface 14 is formed in a part of the same diameter portion 12. As a result, a non-circular portion, which is not perfectly circular in cross section, is formed in the same diameter portion 12. The purpose of this is to avoid the possibility of rotation if the whole is completely symmetrical about the central axis, thereby avoiding it.

[0013]

[Installation Method (1)] Next, a method of attaching the insert 1 to an existing structure, for example, a concrete structure, artificial stone, brick, bedrock or the like will be described.

<A> Injection cylinder. First, the injection cylinder 2 is used. As shown in FIG. 4, the injection cylinder 2 is provided with a screw 21 at its tip, and has a hollow through passage 2 therein.
2 is a cylindrical body. In the following description, for convenience of explanation, a description will be given as a combination of the “injection cylinder 2” and an “exhaust port 25” described later. However, in the case of upward construction, the filler is injected from the exhaust port 25 side in the drawing, and In some cases, exhaust is performed from the side.

<B> Integration with insert 1. The screw 21 at the tip of the injection cylinder 2 is screwed from one end to the other end of the screw hole 11 of the insert 1 to be integrated. Further, an outer cylinder 23 is placed in the middle of the injection cylinder 2 and a lid 24 integral with the outer cylinder 23 is attached. This lid 24
Is provided with an exhaust port 25 for bleeding air.
Are integrated while penetrating the center of the lid 24. The outer cylinder 23 is used when the injection cylinder 2 is made of a thin material. If the injection tube 2 has a sufficient thickness and can be tapered, a large rotational force can be applied from the outside to cut off the adhesion, so that the outer tube 23 is unnecessary.

<C> Drilling. On the other hand, a cylindrical hole is drilled in a structure, a bedrock or the like using a cylindrical diamond cutter or the like. If an old, metal insert is already installed, the hole is drilled using a cutter having a diameter greater than the outer diameter of the insert, and the old insert is removed along with the surrounding concrete.

<D> Insertion, closing, filling. Next, the insert 1 attached to the tip of the injection cylinder 2 is inserted into the hole, and the opening of the hole is closed by the lid 24. In this state, if the filler is injected through the injection cylinder 2, the filler is discharged from the other end of the injection cylinder 2, that is, the other end of the screw hole 11 of the insert 1, and can fill the inside of the hole. . When the insert 1 is set upward, the gas may be injected from the exhaust port and exhausted from the injection cylinder 2 in some cases. When the filler is hardened, the lid 24 is removed, and the injection cylinder 2 is rotated using a special tool or the like, and is twisted out of the screw hole 11 of the insert 1 and removed. Thus, the insert 1 can be newly attached to an existing structure or the like. A hook, for example, is screwed into the screw hole 11 of the insert 1 from the outside, and piping and wiring are attached to the hook for use.

[0018]

[Installation method (2)] Next, another method of attaching the insert 1 to an existing concrete structure, rock or the like will be described.

<A> Mounting of fixing bolts. The fixing bolt 3 is screwed into the screw hole 11 of the insert 1 from one side to be integrated. Fixing bolt 3
Is mounted at the base end or in the middle with the lid 24 penetrating therethrough. The cover 24 is attached in a state of being in direct contact with the surface of the insert 1 or in a state of being separated therefrom. When the lid 24 and the insert 1 are separated from each other, an outer cylinder is put between them so that the fixing bolt 3 can be easily pulled out.

<B> Installation of anchor bolts. On the other hand, the anchor bolt 4 is screwed in from the other side of the screw hole 11 of the insert 1 to be integrated. The anchor bolt 4 has a normal shape in which an enlarged portion or the like is formed at the other end of the bolt to improve the fixing property.

<C> Insertion, occlusion, injection. A concrete structure, rock, or the like is drilled, and the insert 1 is inserted into the drilled hole with the anchor bolt 4 facing the hole bottom. Then, the opening of the hole is closed with the lid 24. Thereafter, if the filler is injected into the hole from the injection port opened in the lid 24, the hole can be filled with the filler. When the filler is hardened, the lid 24 is removed, and the fixing bolt 3 is rotated to twist out the screw hole 11 of the insert 1 and remove it. Thus, the strong insert 1 with the anchor attached to the tail end side of the insert 1 can be newly attached to an existing structure or the like.

[0022]

[Installation method (3)] As shown in FIG. 10, the insert 1 and the injection cylinder 2 are preliminarily embedded in the concrete, mortar, or cement milk block 6 in the factory, and the block 6 is inserted into the borehole. An insertion method can also be adopted. In this case, the protrusion 61 is provided on the outer periphery of the block 6 as a spacer. If the filler is injected from the injection cylinder 2 after the block 6 is housed inside the hole and the lid 24 is attached, the filler is discharged from the tail end of the insert 1 into the hole and the filler is deposited on the outer periphery of the block 6. Get around and unite. Since such a block 6 can be manufactured at a factory, good quality can be ensured.

[0023]

According to the present invention, the insert and its mounting method are as described above, and the following effects can be obtained. <A> Since the insert 1 of the present invention is made of ceramics, it does not corrode even when used for a long time. Therefore, if a mounting bracket such as a hook screwed into the insert 1 is corroded, it can be used in a permanently safe state if only the bracket is removed and replaced with a new bracket. <B> The diameter of the insert 1 is gradually reduced from the diameter of the same-diameter portion 12 to the middle of a plurality of the same-diameter portions 12 having the same diameter, and then expanded again to have the same diameter as the same-diameter portion 12. This is a shape in which the narrowed portion 13 is formed. That is, it is formed in a so-called drum shape. Therefore, insert 1
When a metal piece such as a hook is attached to the insert 1, most of the load acts as a compressive force on the insert 1. For this reason, even ceramics that are weak in tensile force can sufficiently withstand practical use. <C> In the insert 1, a narrowed portion 13 whose diameter gradually increases is formed in the middle of the same-diameter portion 12. In the gradually expanding portion, the compressive force can be dispersed and smoothly transmitted to the outer portion having the same diameter, so that the compressive force does not concentrate and the risk of breakage can be avoided. <D> Since it is a ceramic insert, it has good electrical insulation and high resistance to electrolytic corrosion. Further, if cement is used as the filler, the reliability can be maintained for a long time without being damaged by fire.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of the insert of the present invention.

FIG. 2 is a perspective view thereof.

FIG. 3 is a perspective view of another embodiment.

FIG. 4 is an explanatory view of an injection cylinder 2.

FIG. 5 is an explanatory view of a state of insertion into a drilled hole.

FIG. 6 is a perspective view thereof.

FIG. 7 is an explanatory view of another embodiment.

FIG. 8 is an explanatory view of another embodiment.

FIG. 9 is an explanatory view of another embodiment.

FIG. 10 is an explanatory view of another embodiment.

Continued on the front page (72) Inventor Shojiro Masuo 1-17-17 Yoshioka Higashi, Ayase-shi, Kanagawa Prefecture (72) Inventor Kimio Momose 532 Hiratsuka-shi Public Office, Kanagawa Prefecture 2-17-16 (56) References JP-A-56-135650 (JP, A) JP-A-58-177499 (JP, U) JP-A-1-90905 (JP, U) JP-A 48-67526 ( (JP, U) Actually open 58-72300 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/41 503 F16B 37/04

Claims (3)

(57) [Claims] 1. A cylindrical body entirely formed of ceramic, having a threaded hole for screwing a bolt therein, and a plurality of portions having the same diameter formed on the outer periphery. In the middle of the same-diameter portion, a constricted portion is formed that gradually decreases in diameter from the diameter of the same-diameter portion and expands again to reach the same diameter as the same-diameter portion. Notched insert 2. A screw is engraved at the tip and a hollow injection tube is used. A screw portion at the tip of the injection tube is screwed into a screw hole of the insert according to claim 1 to be integrated, thereby forming a concrete structure. Drilling an object, insert the insert at the tip of the injection cylinder into this drilling, close the opening of the drilling hole leaving an exhaust port , and inject the filling material through the injection cylinder, insert How to attach 3. The screw hole of the insert according to claim 1, wherein a fixing bolt is screwed together with a closing plate having an inlet port and an exhaust port opened from one side thereof, and an anchor is inserted from the other side of the screw hole. Bolts are screwed together to drill a hole in a concrete structure, etc.Into this hole, insert an anchor bolt to the bottom of the hole, insert an insert, close the opening of the hole with a closing plate, Inserting method by inserting filler into the hole from the opened inlet