JPH019850Y2 - - Google Patents

Description

[Detailed description of the invention] (Prior art) Concrete embedding tools with built-in nuts have been provided conventionally. This device is widely used because it allows attachments such as lightweight ceilings and plumbing equipment to be easily attached to hard concrete walls. An example of such a concrete embedding tool is the one disclosed in Japanese Utility Model Publication No. 53-22250.
As shown in FIGS. 12 to 14, a cap 23 is provided which has a nut fitting part 21 as a space and a recessed part 22. A nut 24 is fitted into the cap 23, and a peripheral wall 25 of the cap 23 is used to tighten the nut 24. Corner side 2
4a, insert molding is performed in this state, and resin is cast into a cylindrical shape, and nails 27 are provided in the lower mounting portion 26. In the case of a concrete embedding device with such a structure, a male screw 28 for attaching an attachment is screwed into a built-in nut 24, thereby easily attaching an attachment such as a lightweight ceiling or piping equipment to a hard concrete wall. It is.

By the way, the concrete embedding tools for buildings according to Publication No. 53-22250 are as follows () to ()
It has the following disadvantages.

() Concrete embedding tools for buildings are available in a number of sizes depending on the type of attachment mentioned above (lightweight ceilings, piping equipment, etc.).
In the case of Utility Model Publication No. 53-22250, Natsuto 24
Because the nut 24 is fitted into a separate cap 23, a separate cap 23 with a different inner diameter must be prepared for each nut 24 with a slightly different diameter. That is, if the nut 24 has five different diameters, five different caps 23 with different inner diameters must be prepared. This is because if there is even a slight gap between the peripheral wall 25 of the cap 23 and the corner side 24a of the nut 24, the nut 24 will shift laterally, and this will cause the light weight attached to the concrete wall to be attached via the nut 24 and the male screw 28. This is because attachments such as the ceiling and plumbing equipment may also wobble.

() It is preferable to make the cap 23 from resin in consideration of moldability, cost, etc. However, in this case, the screw 28 may be accidentally screwed into the screw hole of the nut 24 due to worker carelessness or the like. When the end of the male screw 28 is attached to the resin cap 23,
The upper wall 23a of the upper wall 23a is strongly pressed, and a crack appears from there. Since the male screw 28 is inserted after the concrete wall 29 has hardened, soft fresh concrete will not enter the cap 23 from the crack and clog it. If the nut 24 advances to the peripheral wall 25 that comes into contact with the corner side 24a of the nut 24, the nut 24 will rattle, and the screw 28 will be screwed into the nut 24 to prevent installation of lightweight ceilings, piping equipment, etc. Things also shake.

() In the case of Utility Model Publication No. 53-22250, as stated in the specification, the upper wall 23a of the cap 23
Since the nails 27 are driven into the temporary concrete frame 30 by hitting with a hammer or the like, the upper wall 23 of the cap 23 is made of resin.
Cracks often occur from a.
Since there is a space called the depression 22, cracks are more likely to occur. If the crack advances to the cap circumferential wall 25 that abuts the corner side 24a of the nut 24 as described above, the carefully built-in nut 24 will shift laterally due to the crack, and the screw 28 will be screwed into the nut 24. This causes looseness in attached objects such as lightweight ceilings and plumbing equipment.

The disadvantages of () to () above are that the entire nut 24 is fitted into the cap 23, and the peripheral wall 25 of the cap 23 is
This is due to the fact that the nut 24 is brought into contact with the corner side surface 24a. To reliably prevent rattling,
In order to prevent the occurrence of cracks, it is necessary to take precautions such as making the cap 23 a rather expensive cast product or a similarly expensive drawn steel plate product.

(Purpose) The purpose of the present invention is to eliminate the drawbacks () to () of the above-mentioned prior art. That is, to eliminate as much as possible the disadvantages of having to prepare several types of caps for different nut diameters, and furthermore to eliminate the disadvantage of rattling of objects attached to lightweight ceilings, piping equipment, etc. With the goal.

(Structure) The present invention focuses on the fact that the drawback of the prior art is that the entire nut 24 is fitted into the cap 23 and the peripheral wall 25 of the cap 23 is brought into contact with the corner side surface 24a of the nut 24. be. That is, the feature of the present invention is that the conventional method of fitting the nut 24 into the cap 23 is eliminated. In detail, as in the typical example shown in FIG.
The point is that the nut 1 is applied only to the upper surface (one of the surfaces having the screw hole).

The configuration of the present invention will be explained in more detail below. That is, FIGS. 1 to 9 show a first embodiment of the present invention, and FIGS. 10 and 11 show a second embodiment of the present invention. Third
In the figure, reference numeral 1 indicates a nut, for example, a square nut made of metal, and in this example, it is a hexagonal nut.
2 is a cap, which corresponds to the cap 23 of a conventional building concrete embedding tool. As shown in FIGS. 3 and 8, the cap 2 has a recess 3 approximately in the center, and has a flange 4 on the outer edge of the recess 3 that extends only laterally. It is desirable that the depth of the recess 3 be varied depending on the amount of insertion of the male screw 28 described above. Since the cap 2 is often hit with a hammer or the like when being fixed to the concrete temporary frame 30 as will be described later, it is desirable to make it from impact-resistant material such as ABS resin or polycarbonate. In the case of the second embodiment, a stepped portion 5 is provided on the inner surface of the cap 2, as shown in FIG.

As shown in FIG. 3, by placing the flange 4 of the cap 2 on the top surface of the nut 1, the flange of the cap 2 is placed so that the recess 3 of the cap 2 faces the screw hole 1a of the nut 1. 4 and Natsuto 1
The surrounding area is integrally cast in a cylindrical shape with resin. As a result, the cylindrical body 6 is formed into a cylindrical shape toward the bottom of the nut 1. The hollow portion of the cylindrical body 6 is for inserting the male screw 28. Here, the molded resin, that is, the resin constituting the cylindrical body 6, comes into direct contact with the corner side surface 1b of the nut 1, as shown in FIG. It is desirable that the molding resin be made of polyethylene resin (PE), which has good adhesion to metal.

Figure 11 shows the cap 2 and nut 1 placed in the mold 7,
8 and shows the state before the resin is injected, and in this state, the resin is injected into the cavity part C, thereby producing the building concrete embedding tool according to the present invention.

In this example, the building concrete embedding tool has press nails 9 on the inner surface of the cylindrical body 6. The press nail 9 is formed by punching a steel plate. The press nail 9 is made by fitting the tip of the press nail 9 into the recess 8a of the mold 8 as shown in FIG. , is provided on the inner surface side of the cylindrical body 6 by injecting resin in this state. As shown in FIG. 11, the tip of the rod portion 8b is approximately the same diameter as the screw hole 1a of the nut 1. Therefore, the nut 1 is securely fixed to the mold 8 and will not shift due to resin injection pressure.

The building concrete embedding tool having the structure as described above having the cap 2 and the nut 1 and the cylindrical body 6 manufactured by insert molding is used in the following procedure. That is, first, as shown in FIG. 6B, the tip of the press nail 9 is driven in by mainly hitting the cap 2 portion with a hammer or the like, thereby fixing it to the surface of the temporary concrete frame 30. Concrete is poured around the fixed state to form a concrete wall 29, and after the concrete wall 29 has hardened, the temporary concrete frame 30 is removed as shown in FIG. It is buried on the surface side of the wall 29. The male screw 28 is inserted into the screw hole 1a of the nut 1 of the building concrete embedding tool embedded in the concrete wall 29 in this way.
screw in. This external thread 28 allows attachment of fixtures such as a lightweight ceiling or piping equipment.
In this example, the male thread 28 is connected to the screw hole 1 of the nut 1.
It is safe to remove the press nail 9 by hitting the tip of the press nail 9 from the side with a hammer or the like, as shown in FIG. 6E, before screwing it into the hole a. In the case of this example, the press nails 9 are inclined as shown in the figure, so that the lower ends are widened, and can be fixed to the temporary concrete frame 30 in a more stable manner.

The concrete walls of buildings in this invention also include concrete walls of tunnels, bridges, etc.

(Effect) As explained above, in the case of the present invention in which the cap 2 having the flange 4 extending laterally is provided on the outer edge of the recess 3, and the flange 4 is applied only to the upper surface of the nut 1, Unlike the prior art disclosed in Japanese Patent No. 53-22250, since the entire nut 24 is not fitted into the cap 23, there is no need to prepare multiple types of caps 2 for each type of nut 1 diameter. That is, since the present invention is characterized in that the flange 4 of the cap 2 is applied only to the upper surface of the nut 1, two to four different diameters of the nut 1 are available, as shown in FIGS. 15A, B, and C. It is possible to deal with this by using only one size of cap 2.

Furthermore, in the case of the present invention in which the flange 4 of the cap 2 is applied only to the top surface of the nut 1, the screw 28 may be screwed too far into the threaded hole 1a of the nut 1 due to the operator's carelessness or the like. Even if a crack occurs in the upper wall 2a of the cap 2, the crack will not progress any further. In other words, the crack was made in 1973.
Unlike the case of Publication No. 22250, the corner side 1 of the nut 1
It does not progress to b. This is because, as shown in FIG. 3, the corner side surface 1b of the nut 1 is not covered by the cap 2, but by the cylindrical body 6 made by resin molding. it is obvious. In this regard, the one published in Jitsugoku Publication No. 53-22250 is
The peripheral wall 25 of the cap 23 is connected to the corner side 2 of the nut 24.
4a, and extends to the upper wall 23a of the cap 23.
This is very different from the case where a crack that enters the nut 24 extends to the corner side 24a of the nut 24, causing the nut 24 and the attached object to rattle.

If you hit the top wall 2a of the cap 2 too much, the top wall 2a
The same thing applies if there is a crack in a.

In the present invention, in which the nut 1 is integrally cast with the resin forming the cylindrical body 6, the shrinkage of the resin during molding ensures that the resin and the corner side surface 1b of the nut 1 are tightly bonded. Therefore, it is possible to prevent the nut 1 from shifting laterally. In this respect, since the nut 24 is fitted into a separate cap 23, the corner side 24a of the nut 24 and the cap 2
This differs from the one disclosed in Japanese Utility Model Publication No. 53-22250, in which it was inevitable that a gap would be formed between the peripheral wall 25 of No. 3 and the peripheral wall 25 of No. 3. A round nut may be used as long as an anti-rotation groove is provided on the outer surface of the nut.

[Brief explanation of the drawing]

Figures 1 to 9 show the first embodiment of the present invention,
Fig. 1 is a cross-sectional plan view of the vicinity of the square nut, Fig. 2 is a plan view of the entire structure, Fig. 3 is a vertical cross-sectional side view taken along line A-A in Fig. 2, and Fig. 4 is a cross-sectional view of the entire structure. A side view, Fig. 5 is a cross-sectional plan view taken along the line B-B in Fig. 4, Fig. 6 is a side view showing the procedure for embedding in a concrete wall, and Fig. 7 shows the cap, nut, and press. FIG. 8 is a perspective view of the nail before it is set on a rod forming a part of the mold, FIG. 8 is a perspective view of the nail cut in the longitudinal direction, and FIG. 9 is a perspective view of the completed nail. 10 and 11 show a second embodiment of the present invention, with FIG. 10 being a view corresponding to FIG. 8, and FIG. 11 being a longitudinal sectional side view of the mold set in the mold. Figures 12 to 14 are explanatory views of the prior art, with Figure 12 being a perspective view of the cap before the nut is fitted into the cap, and Figure 13 being a partially cutaway side view of the cap fixed to the temporary concrete frame. FIG. 14 is a partially cutaway side view showing a state in which the device is embedded in a concrete wall and a male screw is inserted therein. 1st
5A, B, and C are longitudinal sectional side views of essential parts for explaining the effects of the present invention. In the figure, 1 is a square nut, 1a is a screw hole, 1b is a corner side, 2 is a cap, 3 is a recess, 4 is a flange,
6 indicates a cylindrical body, and 9 indicates a press nail.

Claims (1)

[Scope of Claim for Utility Model Registration] The head is fixed to the surface of the temporary concrete frame by being hammered, concrete is poured around it in this state, and by removing the temporary concrete frame, it is buried on the surface side of the concrete wall. It has a built-in nut into which a male thread for attaching an attachment is screwed, and has a recessed part and a flange extending only laterally on the outer edge of the recessed part, and the flange is connected to the nut. A cap that is attached to the head so that the recess faces the screw hole of the nut by applying only to the top surface, and a resin integrally formed so as to wrap around the flange of the cap and the top surface of the flange that extends horizontally around the nut. a cylindrical body for inserting a male screw, which is formed into a cylindrical shape toward the bottom of the nut by being cast into the nut, and has the cast resin brought directly into close contact with the side surface of the nut; Concrete embeddings for buildings.