JP3067997B2 - Insert bushing coupling structure, insert bushing used therefor, and insert bushing fixture - 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 bushing coupling structure for fixing an insert bush buried in a concrete product such as a U-shaped groove to the inner side surface of a concrete product formwork, and an insert bush and an insert bush fixation therefor. It is about tools.

[0002]

2. Description of the Related Art Conventionally, a concrete product such as a U-shaped groove has a substantially cylindrical shape at a fixing position of a hanging metal fitting for supporting a hanging metal fitting for hanging a hanging wire rope. The insert bush is buried in advance so that its opening is exposed on the side wall surface of the concrete product.When transporting concrete products or laying on the site, wire ropes are hung on the hanging bracket inserted from the opening of the insert bush. The work was stopped and the concrete product was suspended and moved by a crane truck or the like.

When embedding an insert bush in a concrete product, a bolt is inserted through a through hole provided in the form from the outer surface of the form, and the insert bush is screwed into the bolt when the concrete product is manufactured. By tightly fixing to the inner surface of the formwork and then pouring concrete into the formwork, curing and solidifying the concrete, screwing the bolt out of the insert bush and removing the formwork,
An insert bush was buried in the side wall surface of the concrete product so that the end face of the opening was exposed.

[0004] However, in the above method, since the insert bush is fixed to the mold with bolts, the fastening operation is troublesome, and if the end face of the opening of the insert bush does not adhere to the inner surface of the mold, There is a drawback that concrete flows into the insert bush, and after removing the bolt from the insert bush when removing the mold,
Since the mold was removed, the work was extremely troublesome.

[0005]

SUMMARY OF THE INVENTION According to the present invention, an insert bush can be easily fixed to a desired position on the inner surface of a mold,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert bush coupling structure that facilitates removal of a mold frame during demolding, an insert bush used therefor, and an insert bush fixture.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional technique, and in view of the problems of workability of fixing an insert bush to a mold and removing the mold, a substantially hemispherical base is provided at a predetermined position on the inner surface of the mold. An insert bush mounting portion provided with a thread portion for one lead is provided on the outer periphery, and a receiving portion matching the insert bush mounting portion is formed on the inner periphery of the opening of the insert bush made of a soft material from the insert bush mounting portion. By rotating the insert bush one turn with respect to the insert bush mounting portion, the insert bush can be easily and firmly fixed to the inner surface of the mold, and the mold can be removed only by removing the mold when removing the mold. The above-mentioned drawbacks have not been solved by making the insert bush mounting part, together with the mold, detachable from the insert bush by the force to remove the frame. Than it is.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a mold corresponding to the outside of a concrete product W such as a U-shaped groove. Is provided to be openable and closable with respect to a substantially concave mold 1a corresponding to the inside of
Is provided.

The mold 1 is not limited to the mold 1a provided to be openable and closable with respect to the mold 1a, but is provided with a through hole at a portion corresponding to a position where the insert bush 3 is embedded in the concrete product W. 2 may be used.

Reference numeral 4 denotes an insert bush fixing tool made of a material harder than the insert bush 3 made of metal or the like. The insert bush fixing tool 4 is provided on the outer periphery of a substantially hemispherical base formed larger in diameter than the through hole 2. An insert bush mounting portion 6 having a thread portion 5 for one lead is provided, and a screw rod 8 having a diameter capable of passing through the through hole 2 is projected from the center of a bottom surface portion 7 of the insert bush mounting portion 6. And
The screw rod 8 is inserted through the through hole 2 in the inner surface I of the mold 1, and two nuts 9 and 9 a are screwed into the screw rod 8. Is made to protrude.

Further, an air hole 10 is formed through the center axis of the insert bush fixing tool 4.

The insert bush fixing device 4 may be formed by threading a thread portion 5 for one lead on the head of a round head bolt and forming an air hole 10 on the center axis thereof. .

The thread portion 5 is equivalent to one lead, that is, the one on the thread portion 5 when the insert bush mounting portion 6 is rotated once.
The distance at which the point has moved in the axial direction is such that the insert bush 3 can be screwed into the insert bush mounting portion 6 in one rotation, and the number of threads of the thread portion 5 is substantially one. When the mold 1 is turned to the open side when the mold is removed, the insert bush 3 embedded in the concrete product W is operated.
This is because the insert bush mounting portion 6 can be more easily pulled out.

The crest of the thread portion 5 is formed flat so that the above-mentioned pull-out operation can be smoothly performed, and the receiving portion 18 is formed.
The female screw formed on the inner surface is less likely to be caught.

In this embodiment, two nuts 9 and 9a are used for attaching and detaching the insert bush fixing member 4 to and from the mold 1.
A double nut using a nut is shown. However, the present invention is not limited to such a method, and instead of the lock nut 9a, it is possible to use a wing nut, simply tighten with one nut or wing nut, or use a screw. A through hole communicating with each of the rod 8 and the nut 9 may be provided, and a split pin may be inserted into the through hole.

The insert bush 3 is made of a synthetic resin and has an opening 12 at one end of a substantially cylindrical body 11 and a closed end 13 at the other end.

Reference numeral 14 denotes a flange formed so as to protrude toward the outer periphery of the closed end portion 13 so as to expand in the outer peripheral direction. An annular rim 15 is integrally formed on the periphery of the flange 14 so as to protrude toward the opening portion 12 side. Is formed.

Reference numeral 16 denotes a plurality of ribs which are formed at predetermined intervals on the outer periphery of the body 11 and are protruded in the axial direction. The ribs 16 are formed in a substantially triangular plate shape which gradually inclines toward the closed end 13. And the highest part 16a of the rib 16 and the rim 15
A gap 17 is provided between them.

In the inside of the insert bush 3, a receiving portion 18 is formed on the inner periphery of the opening 12 so as to match the insert bush mounting portion 6, and is formed continuously with the receiving portion 18 with a smaller diameter. The female screw portion 19 to which the hanging metal fitting is screwed is formed up to the closed end portion 13.

In the above, the female screw 19 is connected to the socket 18
The female screw portion 19 may be provided at a slight distance from the receiving portion 18 as shown in FIG.

The insert bush 3 is not limited to the above-described structure. In other words, the insert bush 3 may be provided with a retaining means such as a flange, a retaining protrusion, and a retaining ridge on the outer periphery of the body 11 of the insert bush 3. Good.

The insert bush mounting portion 6 of the insert bush fixing tool 4 protruding from the inner side surface I of the mold 1.
The insert bush 3 is tightly fixed to the inner surface I of the mold frame 1 by screwing the receiving portion 18 of the insert bush 3 to the inside.

Next, the operation of the insert bushing coupling structure according to the present invention will be described. The screw rod 8 of the insert bush fixing tool 4 is inserted into the through hole 2 from the inner side I of the mold 1 so that the mold 1 Nuts 9 and 9a are screwed onto a screw rod 8 protruding from the outer surface O, and the insert bush mounting portion 6 of the insert bush fixing tool 4 is protruded and fixed to the inner surface I of the formwork 1. The socket 18 of the insert bush 3 is screwed into the socket.

When screwing the insert bush 3,
By rotating the insert bush one turn with respect to the insert bush mounting portion 6, the end face of the opening 12 of the insert bush 3 is brought into close contact with the inner surface I of the mold 1, and the insert bush 3 is firmly fixed to the mold 1. State.

Also, the insert bush fixing device 4 is
The insert bushing fixture 4 having the insert bush mounting portion 6 corresponding to the size of the insert bush 1 can be exchanged because it is not welded and fixed to the nuts 9 and 9a.

Then, the mold 1 is closed with respect to the fixed mold 1a, concrete is poured into the molds 1 and 1a, and after the concrete is cured and solidified, the concrete product W is released.

The inside of the insert bush 3 is communicated with the outside through an air hole 10 of the insert bush fixing device 4. The air inside the insert bush 3 is expanded by the air hole 10 during the curing of the concrete by steam. The air is vented to the outside so that the bush 3 is not deformed and the adhesion to concrete is not reduced.

When removing the mold, the mold 1 is rotated.
At this time, since the insert bush fixing device 4 is fixed to the mold 1, the insert bush mounting portion 6 is rotated by the turning operation of the mold 1 to the open side, so that the insert bushing receiving portion 18 of the insert bush 3 is connected to the insert bush fixing portion 4. It is forcibly removed together with the formwork 1.

As a result of the above demolding operation, the end face of the opening 12 of the insert bush 3 is moved to the side wall W1 of the concrete product W.
Exposure to

At the time of suspending the concrete product W, a shaft of a suspension fitting (not shown) is screwed to the female screw portion 19 of the insert bush 3, and a wire is attached to a shuffle rotatably mounted on the shaft. The rope is hooked, the wire rope is hooked by a crane, and the concrete product W can be suspended and moved.

In this suspended state, the ribs 16 are formed to protrude gradually around the insert bush 3 so as to reach the closed end portion 13, so that they have a locking action in the turning direction and the pulling direction. And the flange 14 opens the rim 15
Since it has a substantially hook-shaped cross section projecting toward the 12th side, it has a latching action in the pulling direction, and the retaining function of each part of the insert bush 3 allows the periphery of the insert bush 3 when the concrete product W is suspended. The generated stress can be dispersed, so that there is no damage such as cracks, chips or the like near the buried position of the insert bush 3, and the strength of the concrete product W can be stabilized. Can be prevented from slipping out and safe work can be performed.

[0031]

In short, according to the present invention, an insert bush mounting portion 6 provided with a thread portion 5 for one lead on the outer periphery of a substantially hemispherical base body is provided at a predetermined position on the inner surface I of the mold 1 so as to protrude. A receiving portion 18 matching the insert bush mounting portion 6 was provided in the inner periphery of the opening 12 of the insert bush 3 made of a softer material than the bush mounting portion 6, and the insert bush 3 was screwed to the insert bush mounting portion 6. Therefore, when mounting the insert bush 3 on the insert bush mounting portion 6 protruding toward the inner side I of the form 1,
By forming the thread portion 5 of the insert bush mounting portion 6 for one lead, the insert bush 3 can be easily screwed to the insert bush mounting portion 6 in one rotation, and the mold 1
And the insert bush 3 can be formed in a tightly adhered and fixed state that can sufficiently withstand the shock generated when the concrete product W is cast, so that the concrete can be prevented from entering the insert bush 3 and the concrete product W The insert bush 3 can be embedded at a predetermined position in the side wall W1 without shifting.

The thread portion 5 of the insert bush mounting portion 6 has one lead and the number of threads is approximately one. Also, since the insert bush mounting portion 6 is harder than the insert bush 3, it is difficult to remove. The insert bush mounting portion 6 together with the mold 1 can be easily detached from the receiving portion 18 of the insert bush 3 by the rotating force to the open side of the mold 1 at the time of molding, and the removal work can be simplified. And can be performed efficiently.

Since the base of the insert bush mounting portion 6 to which the insert bush 3 is mounted and fixed is formed in a substantially hemispherical shape, for example, if the insert bush mounting portion has a cylindrical shape, it has a rectangular cross section. Therefore, the turning operation of the mold 1 to the open side at the time of releasing the mold is such that the corner of the insert bush mounting portion is caught by the receiving portion 18 of the insert bush 3 and the mold 1 is turned to the open side. Although it is not possible to do so, it is necessary to remove the hinge portions of the molds 1 and 1a. However, since the insert bush mounting portion 6 according to the present invention has a semi-spherical shape and a substantially arc-shaped cross section, it is necessary to rotate the mold 1 to the open side. In addition, the insert bush mounting portion 6 can be smoothly separated from the receiving portion 18 without being caught on the peripheral surface of the receiving portion 18.

The insert bush mounting portion 6 has air holes 10 communicating with the inside of the insert bush 3 and the outside of the mold 1.
Is provided, the air holes 10 are formed in the insert bushes 3 during steam curing of the concrete after casting the concrete in the molds 1 and 1a, so that the insert bushes 3 are deformed, and the close contact with the concrete is thereby caused. Air can be vented to the outside so as not to cause a drop in performance.
The insert bush 3 can be integrated with the concrete product W at a desired position without any trouble such as deformation and breakage.

A receiving portion is provided inside the insert bush 3.
Since a female screw portion 19 for attaching a hanging metal fitting with a smaller diameter than this is provided at a depth behind the insert bushing portion 6 by pulling out the insert bushing portion 6 by rotating the mold 1 to the open side at the time of removing the mold, the socket is formed. Even if the thread of the part 18 is crushed, the female thread part 19 for the hanging bracket
Since the diameter is smaller than the receiving portion 18 and is formed deeper than the receiving portion 18, there is no hindrance in mounting the hanging bracket on the insert bush 3, and the practical effect is extremely large. is there.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a coupling structure of an insert bush according to the present invention.

FIG. 2 is a sectional view showing a demolding operation of a concrete product.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a perspective view of an insert bush.

FIG. 5 is a sectional view showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Formwork 3 Insert bush 5 Thread part 6 Insert bush mounting part 10 Air hole 12 Opening 18 Reception part 19 Female thread part I Inner surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B28B 7/00 B28B 23/00

Claims (4)

(57) [Claims] 1. An insert bush mounting portion provided with a thread portion for one lead on the outer periphery of a substantially hemispherical base at a predetermined position on an inner surface of a mold, and an insert made of a softer material than the insert bush mount portion. On the inner circumference of the bush opening,
A receiving portion is provided that matches the insert bush mounting portion. An insert bush is screwed into the insert bush mounting portion, and an insert bush is inserted into the insert bush mounting portion.
An air hole communicating between the inside of the insert bush and the outside of the
Coupling structure of the insert bush, characterized in that digit. 2. The coupling structure for an insert bush according to claim 1 , wherein a female screw portion for attaching a hanging metal fitting having a smaller diameter than the receiving portion is provided inside the insert bush. 3. A forming the threaded portion of the first lead component to the substrate outer periphery of a substantially hemispherical shape, the insider <br/> Tobusshu mounting portion for screwing the insert bushing is provided, the mold in the insert bushing mounting portion A means for attaching and detaching to the mold is provided so as to protrude from the side surface , and the insert bush mounting portion is screwed to this.
Air holes that communicate between the inside of the insert bush and the outside of the formwork
Insert bushing fixture, characterized in that the provided. 4. A substantially cylindrical insert bush made of synthetic resin and provided with retaining means on its outer periphery, a receptacle formed substantially on the inner periphery of the opening of the insert bush in conformity with the insert bush mounting portion according to claim 3. Insert bush characterized by having a part.