JPH0737843Y2 - Insert bush coupling structure - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] Industrial field of application The present invention is an insert bush for locking a hanging metal fitting to a side wall of a concrete product for transporting a concrete product such as a U-shaped groove or laying it on site. The present invention relates to an insert bush connecting structure in which an insert bush is embedded in a side wall of a concrete product by simply and closely connecting the insert bush to a formwork.

2. Description of the Related Art Conventionally, when carrying concrete products or laying concrete products on-site, depending on the shape of such concrete products, their transportation, and the purpose of use, suspending metal fittings such as those shown in FIG. 1 are used. A cap-shaped insert bush c to be fitted on the side wall b of the product a, and a concrete product a with a hanging metal fitting as shown in FIG.
The hollow cylindrical insert bush d or the like for inserting the side wall b of the concrete product a is embedded in the concrete product a, and the former cap-shaped insert bush c is different from the side wall b surface of the concrete product when the concrete product a is manufactured. A male screw is threaded through a hole h formed by inserting the insert bush c into the form g so that the end face f of the opening of the insert bush c, which is threaded with a female screw e on the inner surface thereof, is exposed on the same plane. The insert bush c is screwed with the bolt i to connect the insert bush c and the form g, and the insert bush is embedded in the concrete product a by pouring concrete into the form g, g '... Was there.

Further, in the latter hollow cylindrical insert bush d, the insert bush d is bored in the molds g, g ′ so that the openings at both ends are exposed on the inner wall surface and the outer wall surface. , And bolts j with male threads on both ends are tightened with two nuts k and k ', and insert bush d and molds g and g'are joined together to form molds g and g' ... The insert bush d was buried in the concrete product a by pouring concrete into the concrete product a.

However, in such a method, insert bushes c and d having different shapes must be embedded in the concrete product a according to the purpose of use, and molds g and g due to the difference in shape of the insert bushes c and d. It was very troublesome because the method of connecting with ′ was different.

Further, when the concrete poured into the molds g, g '... is in an uncured state, the concrete is applied to the molds g, g'.
To press the molds g, g '... and the insert bushes c, d in close contact with each other, so that the molds g, g' ...
Has a second point that the embedding positions of the insert bushes c and d are displaced due to the loosening of the insert bushes to prevent such close contact.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention makes it possible to make a suspending metal fitting to a side wall of a concrete product and a metal fitting to be fixed to the side wall at the time of manufacturing a concrete product such as a U-shaped groove according to the purpose of use. (EN) A joint structure of insert bushes in which a form insert bush is tightly joined to a form, and the close contact state between the insert bush and the form is maintained until the form is removed from the concrete product.

[Constitution of device]

Means for Solving the Problems In view of this point, the present invention is made of synthetic resin and has a substantially hollow cylindrical insert bush with the same length as the thickness of the buried portion of the concrete product and the bottom cover at the rear end. Is detachably provided, a female screw is engraved on the inner peripheral surface on the opening side, a retaining member is protrudingly provided on the outer peripheral surface, and a bolt having a through hole in the axial direction is formed into a hollow cylindrical hard Insert the rubber from one end surface side, insert the hard rubber into the insert bush so that the other end surface is flush with the opening end surface of the insert bush, and screw the male screw part of the bolt onto the nut fixed to the form. The above-mentioned drawbacks cannot be solved by providing a connecting structure of an insert bush in which a hollow disk-shaped water absorbing member having elasticity is externally fitted to the male screw portion and a butterfly screw is screwed and fixed.

Action The present invention, when the insert bush that is embedded in the side wall when manufacturing a concrete product such as a U-shaped groove is connected to the form, by rotating the bolt in the direction to screw it into the nut with a butterfly screw, the bolt head of the bolt Moves to the opening side of the insert bush, which causes the hard rubber to compress and deform so as to bulge outward, and the female screw on the inner surface of the insert bush is crimped, so that the insert bush is crimped to the bolt through the hard rubber. The mold and insert bush are firmly attached and fixed.

Further, the through holes of the bolts are designed to release the expanded air in the insert bush during steam curing.

Further, since the water absorbing member is externally fitted to the male screw portion of the bolt projecting from the nut so as to come into surface contact with the nut, the moisture of the concrete leaching from the nut is absorbed and blocked.

Embodiments An embodiment of the present invention will be described below with reference to the drawings. 1 is an insert bush made of synthetic resin in which the thickness and the total length of a buried portion of a concrete product 22 such as a U-shaped groove are the same. The insert bush 1 is formed in a substantially hollow cylindrical shape, and a retaining portion 3a formed by projecting an appropriate number of retaining protrusion pieces 2, 2a ...
And a bottom lid 5 formed in a truncated cone shape on the inner peripheral portion 4 of the rear end.
The large-diameter circumferential portion 6 is detachably welded, and a female screw 7 is threaded on a front part of the inner peripheral surface.

The bottom surface lid 5 that forms the bottom surface of the insert bush 1 is not limited to one that is welded, but has an opening 8 so that the circumference of the bottom surface lid 5 of the insert bush 1 in which the bottom surface lid 5 is integrally molded can be detached. A notch may be formed.

Reference numeral 9 is a hard rubber such as urethane formed in a hollow cylindrical shape having an outer diameter equal to that of the opening 8 of the insert bush 1.
From the one end surface 9a of the hard rubber 9 to the hollow portion 10 of the bolt head 11
A bolt 13 formed by penetrating a through hole 12 in the axial direction from the center of the bolt is inserted, the bolt head 11 and the bottom cover 5 are opposed to each other, and the other end surface 9b of the hard rubber 9 is the end surface 24 of the opening 8 of the insert bush 1. The hard rubber 9 is inserted into the insert bush 1 so as to be flush with the insert bush 1.

14 is a concrete product form, and the form 14 is a bolt.
A hole 15 having a diameter substantially the same as the diameter of 13 is drilled at a predetermined position, and the nut 16 is welded and fixed to the form 14 so that the hole 15 and the female screw hole 17 of the nut 16 communicate with each other. A bolt having a hole 18 formed therein and protruding from the opening 8 of the insert bush 1 into the communication hole 18.
The male screw portion 19 of 13 is screwed in to bring the end face 24 of the opening 8 of the insert bush 1 into contact with the form 14, and the male screw portion 19 protruding from the nut 16 has elasticity and is a hollow disk-shaped water absorbing member 20. Nut so that the water absorbing member 20 is elastically contracted while the
The bolt 13 and the butterfly screw 21 are integrated with each other by bringing the butterfly screw 21 into screw contact with the male screw portion 19 by making surface contact with the screw 16.

Incidentally, as a means for fixing the butterfly screw 21 to the bolt 13 by screwing, a hole is formed in both the bolt 13 and the butterfly screw 21, and a locking pin,
A well-known technique conventionally used to prevent loosening of bolts and nuts, such as a method of inserting a wire or a method of pushing a screw thread of a bolt 13 with a small screw from a side surface of a butterfly screw 21.

Next, the operation of the insert bush coupling structure according to the present invention will be described. When the bolt 13 is rotated in the direction in which the bolt 13 is screwed into the nut 16, the bolt head 11 causes the insert bush 1 to move.
Since the hard rubber 9 is moved toward the opening 8 side, the hard rubber 9 is compressed and deformed by its elastic action so as to contract in the axial direction and expand in the radial direction, thereby crimping the female screw 7 on the inner surface of the insert bush 1. As a result, the insert bush 1 is pressed against the bolt 13 via the hard rubber 9, and the mold 14 and the insert bush 1 are firmly and closely fixed to each other.

Then, when the bolt 13 is rotated in the direction to be screwed into the nut 16, the butterfly screw 21 is moved by the distance traveled by the bolt head 11,
Since the water absorbing member 20 is moved away from the position where the water absorbing member 20 is elastically contracted, the water absorbing member 20 elastically returns in the axial direction in a contact state with the nut 16 and the thumb screw 21.

When the insert bush 1 and the mold 14 are combined as described above, the bottom cover 5 of the insert bush 1 is brought into contact with the mold 14a, and concrete is poured into the molds 14 and 14a.
The state shown in FIG. 7 is established.

Further, the water absorbing member 21 absorbs and blocks the water content of the concrete that oozes out from the communication hole 18 while being in surface contact with the nut 16.

After the concrete has hardened, the bolt head 11 and the butterfly screw 21 are moved in the opposite direction by rotating the bolt 13 with the butterfly screw 21 in the direction in which the bolt 13 is retracted from the nut 16. Elastically returns to the radial direction to release the bulging in the radial direction, and the compression with the insert bush 1 is also released.
Further, the water absorbing member 21 is elastically contracted between the nut 16 and the butterfly screw 21,
The water absorbed by the water absorbing member 21 is squeezed out, and the form 14,
When the hard rubber 9 is pulled out from the insert bush 1 by removing 14a, the end surface 24 of the opening 8 of the insert bush 1 and the bottom cover 5 are exposed flush with the outer surface and the inner surface of the side wall 25.

Further, the through hole 12 of the bolt 13 is designed to release the expanded air in the insert bush 1 during steam curing.

[Effect of device]

In short, according to the present invention, a female screw 7 is threaded on the inner peripheral surface of the insert bush 1 made of a synthetic resin and made of a substantially hollow cylindrical shape on the side of the opening 8 and the retaining member 3a is formed on the outer peripheral surface. On the other hand, the bolt 13 having the through hole 12 formed in the axial direction is inserted from the one end surface 9a side of the hard rubber 9 having a hollow cylindrical shape,
The other end surface 9b is the end surface of the opening 8 of the insert bush 1.
A nut that is attached to the insert bush 1 so as to be flush with 24 and has the male screw portion 19 of the bolt 13 fixed to the form 14
Since the hollow disk-shaped water absorbing member 20 having elasticity is externally fitted to the male screw portion 19 and the butterfly screw 21 is screwed and fixed, the bolt 13 is screwed to the nut 16 with the butterfly screw 21. By rotating in the inserting direction, the bolt head 11 of the bolt 13 moves to the insert bush 1 opening 8 side, whereby the hard rubber 9 is compressed and deformed so as to bulge outward, and the inner surface of the insert bush 1 is The female screw 7 is crimped, so that the insert bush 1 is crimped to the bolt 13 through the hard rubber 9, and the mold 14 and the insert bush 1 are strong enough to withstand the impact generated when the concrete product 18 is placed. It is possible to easily achieve a tightly fixed state.

Moreover, by fixing the nut 16 to the mold 14,
Nut 16 by pressing uncured concrete in 14
Since the looseness of the insert bush 1 and the mold 14 can be kept in close contact with each other until the concrete product 22 is detached from the concrete product 22, the insert bush 1 can be embedded at a predetermined position in the side wall 25 of the concrete product 22 without being displaced. In addition, in the insert bush coupling structure according to the present invention, it is not necessary to remove the concrete product 22 from the mold 14 each time the concrete product 22 is demolded. As a result, the bolt 14 and the butterfly screw 21 are removed from the mold 14.
It is possible to prevent a tightening failure such as clogging caused by concrete powder or the like adhering to the male screw portion 19 of the bolt 13 by removing the work for removing the mold and the like from the mold 14 after each mold release.

Further, when the insert bush 1 and the form 14 are connected to each other, the water absorbing member 20 is elastically returned in the axial direction and is capable of absorbing water, so that the water content of the concrete leaching from the communicating hole 18 in a surface contact state with the nut 16 The water is blocked by water absorption, and when the mold 14 is released from the mold, the water is absorbed by the water absorbing member 21 due to elastic contraction between the nut 16 and the butterfly screw 21.

Also, the through holes 12 of the bolts 13 are vented to the outside so that the air in the insert bush 1 expands during steam curing and the insert bush 1 is deformed, which causes a decrease in adhesion with concrete. Can be planned.

Further, since the insert bush 1 made of synthetic resin and having a substantially hollow cylindrical shape has the same length as the thickness of the embedding portion of the concrete product 22 and the bottom cover 5 is detachably provided at the rear end, When the insert bush 1 is connected to the mold 14 as described above, the bottom cover 5 of the insert bush 1 can be brought into contact with the mold 14a, whereby the thumb screw after the concrete is hardened.
The bolt 13 is rotated in the direction to be screwed back from the nut 16 by 21 to release the pressure contact with the insert bush 1 by the hard rubber 9, and the mold frames 14 and 14a are removed to form the end face 24 of the opening 8 of the insert bush 1. Each of the bottom lid 5 and the side wall 25
It can be exposed flush with the outer and inner surfaces of the.

Then, the concrete product 22 can be hung by inserting a hanging metal fitting from the opening 8 of the insert bush 1 that is usually exposed on the outer surface of the side wall 25 of the concrete product 22, and depending on the state of the work site, for example, the concrete product. In the hanging state where the hanging metal fittings protrude from the outer surface of the side wall 25 of the 22, the hanging metal fittings interfere with the earth and sand accumulated near the laying position of the concrete product 22 and the installation becomes difficult. Concrete products 22
The bottom lid 5 exposed on the inner side surface of the side wall 25 of the above can be detached, and hanging metal fittings can be inserted and hung.

Therefore, when the hanging metal fitting is inserted into the insert bush 1, it can be selected in the working state as described above or can be used by inserting it through both holes used at the same time, so that excellent workability can be exhibited. Also, eliminating the need to select insert bushes of different shapes as in the past, there is no need to change the connection structure with the mold 14, therefore, when the concrete product 22 is manufactured, it corresponds to the shape of the insert bushing. No need to select formwork.

Further, in the various hanging states as described above, in order to cope with an external force such as a pulling force applied to the insert bush 1 by the respective hanging states, the slip-off preventing projections 2, 2a ... And the flange 3 of the insert bush 1 are formed. Since the retaining portion 3a exerts a hooking action on the concrete product 22, it prevents the concrete product 22 from slipping out and shifting, and its practical effect is very great.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIGS. 1 and 2 are cross-sectional views of a main part showing a conventional insert bush coupling structure, and FIG. 3 is a perspective view of the insert bush according to the present invention. 4 is a sectional view taken along line AA of the same as above, FIG. 5 is a perspective view of a hard rubber according to the present invention, FIG. 6 is a side view of a bolt according to the present invention, and FIG. 7 is a combination of an insert bush according to the present invention. It is a principal part sectional view which shows a structure. 1 insert bush, 3a retaining member, 5 bottom cover, 7 female screw, 8 opening 9 hard rubber, 9a one end face, 9b other end face, 12 through hole, 13 bolt, 14 formwork 16 nut, 19 male screw part, 20 water absorbent material, 21 butterfly screw, 22 concrete product

Claims (1)

[Scope of utility model registration request] 1. A synthetic resin-made substantially hollow cylindrical insert bush whose length is the same as the thickness of a buried portion of a concrete product, and a bottom lid is detachably provided at a rear end,
A female screw is engraved on the inner peripheral surface on the opening side, a retaining member is provided on the outer peripheral surface so as to project, and a bolt having a through hole formed in one axial direction is formed from one end surface side of the hollow cylindrical hard rubber. Insert the hard rubber into the insert bush so that the other end surface is flush with the opening end surface of the insert bush, and screw the male screw part of the bolt into the nut fixed to the form, An insert bush coupling structure characterized in that a hollow disk-shaped water absorbing member having elasticity is externally fitted and a butterfly screw is screwed and fixed.