JPH0444699Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] Industrial field of use This invention is used to lock hanging fittings to the side walls of concrete products such as U-shaped grooves when transporting or laying concrete products. , relates to an insert bushing buried in a concrete product.

Conventional Technology Conventionally, when transporting concrete products or laying them on site, hollow cylindrical insert bushes are buried in the concrete products depending on the shape of the concrete product and its purpose of transportation and use, and two bolts are inserted into the concrete product. The concrete product was suspended by connecting the insert bush and the formwork by tightening them with two nuts, but with this method, the shape of the concrete product was adjusted depending on various conditions such as the purpose of use and the shape of the hanging metal fittings. Different insert bushes had to be buried in the concrete product, and due to the different shapes of the insert bushes, the method of connecting them to the formwork was different, which was extremely troublesome.

In addition, there are some insert bushes in which a bottom cover is removably welded to the inner surface of the rear end of the insert bush, but when the bottom cover is removed, such insert bushes are attached to the rear end of the insert bush main body together with the bottom cover. It had the disadvantage that some parts were missing.

Problems to be solved by the invention This invention is capable of both fitting the hanging fitting into the side wall of the concrete product and fixing it to the side wall, depending on the purpose of use when manufacturing concrete products such as U-shaped grooves. At the same time, it is an object of the present invention to provide an insert bushing which prevents damage to the rear end portion.

[Structure of the idea]

Means for Solving the Problems In order to solve the above-mentioned drawbacks, the present invention has a main body made of synthetic resin having a substantially hollow cylindrical shape, and a number of substantially triangular protrusions are formed on the rear end of the main body, and the front outer periphery is The insert has a protruding flange with an appropriate number of retaining protrusions around the periphery, and the large-diameter circumferential part of the truncated conical bottom cover is removably welded to the intermediate inner circumferential part of the insert bush. It provides information.

Function This invention is suitable for embedding insert bushes in side walls when manufacturing concrete products such as U-shaped grooves.
The opening of the insert bushing is brought into close contact with the specified part of the formwork, cement is poured into the formwork, and after the cement has hardened, the formwork is removed, and the end face of the insert bushing opening is exposed flush with the side wall surface. It is.

In such a case, if the bottom cover of the insert bush is also buried in contact with the formwork, the bottom cover, which is removably welded to the intermediate peripheral surface of the insert bush, will be detached after the formwork is removed, and the bottom cover will move from the outer surface of the side wall to the inner surface. This means that a hollow cylindrical insert bushing that passes through the hole is buried.

When the insert bushing is buried in the side wall of the concrete product as described above and the concrete product is suspended, the retaining protrusion and flange of the insert bushing are prevented from slipping out or shifting from the concrete product. That's what I do.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an insert bush made of synthetic resin. Triangular protrusion 2,
2a... are continuously formed, a flange 4 with an appropriate number of retaining protrusions 3, 3a... protruding around the front outer circumferential surface is provided, and a bottom surface formed in a truncated conical shape is provided on the intermediate inner circumference. The large-diameter circumferential portion 6 of the lid 5 is removably welded, and the front part of the inner circumferential surface is formed with an annular uneven strip 7.
It is engraved on.

Note that the bottom cover 5 is not limited to a welded one, but can also be formed into a truncated cone shape by notching the circumference of the bottom cover 5 of the insert bush 1 having an opening 8 and integrally forming the bottom cover 5. , the insert bush 1 may be configured to be detachable from the large diameter circumferential portion 6.

In other embodiments, a female thread 9 is formed in a front portion of the inner circumferential surface of the insert bush 1.

10 is the opening 8 of the insert bush 1 whose outer diameter is
A hard rubber such as urethane is formed into a hollow cylindrical shape with the same diameter as the bolt 14. A through hole 13 is formed in the hollow part 11 of the hard rubber 10 in the axial direction from the center of the bolt head 12. Insert the bolt head 12
A hard rubber 10 is inserted into the insert bush 1 with the bottom cover 5 facing the bottom cover 5.

Reference numerals 15 and 15a are formworks for concrete products, and the formworks 15 and 15a are provided with communicating holes 16 having approximately the same diameter as the bolts 14 at predetermined positions.
6 is screwed together with a butterfly screw 18 through the male threaded portion 17 of a bolt 14 protruding from the opening 8 of the insert bushing 1, thereby fixing the formwork 15 and the insert bushing 1 in close contact.

Reference numeral 19 denotes a hanging metal fitting, and the hanging metal fitting 19 has a U-shaped locking part for locking a wire rope attached to one end of a substantially rod-shaped shaft that substantially matches the inner diameter of the insert bush 1. Figures 10 and 11
As shown in the figure, it is inserted into an insert bush 1 buried in a side wall 21 of a concrete product 20.

The shape of the hanging fitting 19 is not limited to the above-mentioned one, but it can be made by attaching a U-shaped locking part across both ends of a shaft with male screws cut into both ends, and tightening both ends with nuts. The material may be inserted into an insert bush 1 embedded in a side wall 21 of a concrete product 20 as shown in FIG.

Next, the operation of the insert bushing according to the present invention will be explained. As shown in FIG. By tightening the butterfly screws 18, the formwork 15 and the insert bushing 1 are tightly fixed, and the hard rubber 10 present on the inner surface of the insert bushing 1 is connected to the bolt head 12 of the bolt 14 and the inner surface of the formwork 15. The hard rubber 10 expands outward due to compressive force and presses against the uneven stripes 7 formed on the inner surface of the insert bushing 1.
The insert bush 1 and the bolt 14 are crimped together through the bolt 14, and in order to prevent the insert bush 1 from being deformed by the tightening pressure of the bolt 14 and butterfly screw 18, air is vented through the through hole 13 provided through the bolt 14. By applying this, the pressure in the space 22 inside the insert bush 1 and the pressure due to the concrete poured into the formwork 15 are kept constant, and the insert bush 1 is tightly fixed to the formwork 15. .

Then, cement is poured into the formworks 15, 15a, and after the cement has hardened, the butterfly screw 18 is screwed back, the formworks 15, 15a are removed, and the hard rubber 10 is pulled out. is exposed flush with the side wall 21.

In addition, as shown in Fig. 9, concrete products 20
The opening 8 of the insert bush 1 is tightly fixed to the formwork 15 forming the outer shape of the side wall 21 of the formwork 15a.
The projecting pieces 2, 2a of the insert bush 1 are brought into contact with the tips of the concrete and formworks 15, 15.
After the concrete poured in a has hardened, screw back the butterfly screw 18, remove the formwork 15, 15a, pull out the hard rubber 10, and use a rod or the like to close the bottom cover 5.
By pressing , the bottom cover 5 removably welded to the inner periphery of the rear end of the insert bush 1 can be easily removed together with the concrete that has flowed a little between the bottom cover 5 and the formwork 15a, and the inner surface of the side wall 21 is moved from the outer surface to the inner surface. This means that a hollow cylindrical insert bush 1 penetrating through the hole is embedded.

Further, the shaft of the hanging fitting 19 is fitted into the insert bush 1 buried in the side wall 21 of the concrete product 20 as described above, and the wire rope is locked to the locking device to suspend the concrete product 20. In this state, the retaining protrusions 3, 3a, . . . and the flange 4 of the insert bush 1 are prevented from slipping out or shifting from the concrete product 20.

[Effect of idea]

In short, the present invention has a large number of substantially triangular protrusions 2, 2a, etc. formed on the rear end of the main body 1, which is made of synthetic resin and formed into a substantially hollow cylindrical shape, so that concrete products 20 such as U-shaped grooves can be During manufacturing, the insert bush 1 is connected to the formwork 15 using hard rubber 10, bolts 14, and butterfly screws 18, and cement is poured into the formwork 15, 15a, thereby producing the concrete product 20.
The insert bush 1 can be buried flush with the side wall 21 of the insert bush 1, exposing only the end face 23 of the opening 8.
...Concrete flows in between the protrusions 2 and 2a.
. . . are each held within the concrete, so that the insert bush 1 and the concrete product 20 can be integrated.

In addition, an appropriate number of retaining protrusions 3, 3a... are provided on the front outer peripheral surface.
Since the flange 4 protruding from the periphery is formed, the shaft of the hanging metal fitting 19 is inserted into the insert bush 1 buried in the side wall 21 of the concrete product 20, and the wire rope is locked to the locking device. When the concrete product 20 is suspended, the retaining protrusions 3, 3a of the insert bush 1...
...and the flange 4 can be prevented from slipping out or shifting from the concrete product 20,
Personal accidents caused by falling concrete products 20 can be prevented.

In addition, since the large diameter circumferential portion 6 of the truncated conical bottom cover 5 is removably welded to the inner circumferential portion of the base of the protrusions 2, 2a..., the protrusions 2, 2a... of the insert bushing are simply attached.
...The insert bush 1 is buried with its tip in contact with the formwork 15a, and the bottom cover 5 is removed by the rod-shaped body, and at the same time, the concrete that has flowed in between the projecting pieces 2, 2a is also pushed out to form the concrete product 20. The concrete product 2 can be formed with a hollow cylindrical insert bush 1 penetrating the side wall 21.
There is no need to select between the above two types of insert bushes to be buried in the concrete product 20 depending on the transportation of the concrete product 20, the installation conditions at the site, etc.; It can be attached to the bush 1 and transported under suspension, and there is no need to change the coupling structure for different types of insert bushes as in the past. , 2a... can prevent the rear end of the insert bush 1 from being damaged when the bottom cover 5 is removed by the rod-shaped body.

In addition, since the annular unevenness strip 7 is carved on the inner circumferential surface,
By rotating the butterfly screw 18, the hard rubber 10 bulges outward and is pressed against the uneven strip 7, thereby forming the formwork 15.
Insert bushing 1 can be firmly fixed in place.

Further, since the internal thread 9 is formed on the inner circumferential surface of the insert bush 1, the practical effects such as the same effect as the above-mentioned uneven strip 7 can be achieved.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a front view of the insert bushing according to the present invention.
2 and 3 are side views of the same, FIG. 4 is a sectional view taken along the line A-A in FIG. 2, FIG. 5 is a sectional view showing another embodiment, and FIG. 6 is an insert bush according to the present invention. A perspective view of the hard rubber used for embedding the above in the concrete product, Figure 7 is a side view of the same bolt,
FIGS. 8 and 9 are sectional views of essential parts of the insert bush according to the present invention showing the state in which the concrete product is buried, and FIGS. 10 to 12 are views showing the same in use. 1... Insert bushing, 2, 2a... Projection piece, 3, 3a... Removal prevention projecting piece, 4... Flange, 5
...Bottom lid, 6...Large diameter circumferential part, 7...Irregular stripes,
9...Female screw.

Claims (1)

[Scope of utility model registration request] A large number of approximately triangular protrusions are formed on the rear end of the main body, which is made of synthetic resin and has a roughly hollow cylindrical shape, and a flange with an appropriate number of retaining protrusions protruding around the front outer peripheral surface is formed. In addition, the insert bush is characterized in that the large-diameter circumferential portion of the truncated conical bottom cover is removably welded to the inner circumferential portion of the protrusion base.