JPH049004B2 - - Google Patents

Description

[Detailed Description of the Invention] (Prior Art) For example, in electrical conduit piping work, switching piping is often performed in which a synthetic resin pipe is buried inside a concrete wall and a metal pipe is piped outside the concrete wall. be.

In such a case, conventionally, a conduit end protector 30 is used as shown in FIG. The threaded part 32a of the male threaded body of the synthetic resin joint 32 that connects Resin joint 32
Remove the female threaded body and remove the threaded part 32 of the male threaded body.
A metal joint 33 is attached to a, and one end of a metal pipe M is connected to the metal joint 33, thereby providing switching piping.

(Problem to be solved by the invention) However, when a conduit end protector is used for switching piping, the connection point between the synthetic resin joint and the metal joint must be installed so that it is located within the conduit end protector. Therefore, when bending a metal pipe outside a concrete wall, force is applied to the connection point between the synthetic resin joint and the metal joint, causing damage to the threaded part 32a of the male threaded body of the synthetic resin joint 32. There was a problem in that the synthetic resin joint 32 and the metal joint 33 would be separated due to breakage, making subsequent piping of the metal pipe impossible.

The present invention has been made in view of these circumstances, and provides a concrete buried structure equipped with a joint that can reliably switch piping from a synthetic resin pipe to a metal pipe without breaking the joint. The purpose is to

(Means for solving the problem) That is, the concrete buried object equipped with the joint according to the present invention has a joint that connects a synthetic resin pipe buried inside a concrete wall and a metal pipe piped outside the concrete wall. A joint with a synthetic resin joint part that connects a synthetic resin pipe and a metal joint part that connects a metal pipe, and the metal joint part of the joint is buried in concrete within a concrete wall. a protective body to which the joint is attached with the metal joint part exposed so that the joint is supported;
It is characterized by consisting of.

(Function of the invention) In the case of a concrete buried object equipped with a joint according to the present invention, since the metal joint part is buried in the concrete wall and supported by concrete, the metal joint part connected to the metal joint part is Even if excessive force is applied to the metal joints, such as when pipes are bent,
Breakage at the connection point between the synthetic resin joint part and the metal joint part is completely prevented, and piping can be reliably switched from a synthetic resin pipe to a metal pipe.

(Example) Hereinafter, the present invention will be specifically described according to an example shown in the drawings.

FIGS. 1 and 2 show an embodiment of a concrete buried object equipped with a joint according to the present invention, and the concrete buried object equipped with this joint consists of a synthetic resin joint part 11 and a metal joint part 12. Naru fitting 10
and a protector 1.

The protector 1 has an opening 8 at the bottom, nail insertion holes 7 on both sides of the center and at the rear for inserting nails for fixing the protector 1 to the temporary frame 20, and is formed into a triangular shape in plan view. There is. A joint 10 is attached to the front part of the protector 1.

In this embodiment, as shown in FIG. 3, the front part of the protector 1 is formed into a stepped shape, and the bottom surface is a semicircular mounting surface 3 on which a cylindrical metal joint part 12 can be mounted. The side surface thereof is formed into a contact surface 4 with which the opening at one end of the metal joint portion 12 comes into contact.

The mounting surface 3 is provided with a screw insertion hole 5 through which a set screw 13 is inserted. The set screw 13 is adapted to be screwed into a screw hole 14 formed in the peripheral wall of the metal joint portion 12 placed on the placement surface 3.
Therefore, in this joint 10, the set screw 13 is removed and the metal joint part 12 is placed on the mounting surface 3.
Insert the set screw 13 from the inside of the protector 1 into the screw insertion hole 5.
and further into the screw hole 14 of the metal joint part 12.
It is designed to be attached to the protector 1 by screwing it onto the protector 1.

The contact surface 4 is provided with a protrusion 6 that is curved to match the inner shape of the opening at one end of the metal joint part 12. By fitting the protrusion 6 into the opening at one end of the metal joint part 12, Then, the metal joint part 1 on the mounting surface 3
2 is positioned, and the metal joint portion 12 on the mounting surface 3 does not wobble, allowing the mounting to be carried out in a more stable state.

Synthetic resin joint part 11 for connecting synthetic resin pipe P
A male thread 15 is formed in the opening at one end.
On the other hand, a female thread 16 is formed at one end of the metal joint part 12 that connects the metal pipe M, and the synthetic resin joint part 11 and the metal joint part 12 have a fourth
As shown in the figure, they have a structure in which they are connected together in advance by screwing. In addition to the joint 10 shown in this embodiment, the present invention includes a joint 10 in which a synthetic resin joint part 11 and a metal joint part 12 are connected by fitting, a structure in which they are connected by screws, etc. The connection structure is not particularly limited. Alternatively, the joint 10 may be integrated by insert molding.

Now, the case of switching the piping from the synthetic resin pipe P to the metal pipe M will be explained using the above embodiment.

First, as shown in FIG. 5, the set screw 13 of the metal joint part 12 is inserted from below into the screw insertion hole 5 provided on the mounting surface 3 of the protector 1, and then the screw hole of the metal joint part 12 is inserted from below. 14 and the joint 10 is attached to the protective body 1, the nails 21 are inserted into the nail insertion holes 7 provided on both sides and the rear of the center of the protective body 1, and the concrete buried object is attached to the temporary frame 20. It is fixed to the temporary frame 20 by hammering.

Next, one end of the synthetic resin pipe P buried in the concrete wall is connected to the synthetic resin joint part 11. In the case of this example, as shown in FIG. The connection is made by fitting the claws 17 into the recesses Pa of the corrugated synthetic resin pipe P, or by biting into the outer periphery of the smooth synthetic resin pipe P.

Next, as shown in FIG. 6, concrete is poured, and after the concrete is cured, the temporary frame 20 is removed.
Next, use the screwdriver 22 to remove the set screw 13 whose head is exposed inside the protector 1. By removing this set screw 13, the protector 1 is removed from the concrete wall as shown in FIG. In this case, the synthetic resin joint part 11 and the metal joint part 12
The connection point 2 is buried in the concrete wall,
Furthermore, the metal joints are also buried within the concrete wall so that they are supported by the concrete.

After removing the protector 1, as shown in FIG. 14, one end of the metal tube M and the metal joint portion 12 are connected. In this way, the piping is switched from the synthetic resin pipe P to the metal pipe M.

In addition, in the present invention, the attachment of the joint 10 to the protector 1 is not limited to the above-mentioned embodiment, and for example, the attachment of the joint 10 to the protector 1 is not limited to the embodiment described above. It is also possible to provide a structure in which an insertion cylinder is provided, and the metal joint part 12 is press-fitted into this insertion cylinder, so that the inner peripheral surface of the insertion cylinder is brought into pressure contact with the outer peripheral surface of the metal joint part 12.

FIG. 9 shows another embodiment of the present invention, in which the contact surface 4 of the protector 1 of the embodiment shown in FIG. 2 is opened, and a metal pipe M can be inserted into the pipe. It has a structure in which it is formed in the insertion hole 9. In this example, since the metal pipe M can be inserted through the pipe insertion hole 9 and connected to the metal joint part 12, piping can be done without removing the protector 1 from the concrete wall.

(Effects of the Invention) A concrete buried object equipped with a joint according to the present invention includes a joint comprising a synthetic resin joint part that connects a synthetic resin pipe and a metal joint part that connects a metal pipe;
A metal pipe connected to a metal joint with a protector attached to the joint with the metal joint exposed so that the metal pipe joint of the joint is supported by concrete within a concrete wall. Even if excessive force is applied to the metal pipe joint when the pipe is bent, the breakage at the connection point between the synthetic resin joint and the metal joint is completely prevented, and subsequent metal pipe piping is prevented. This solves the problem of inability to use synthetic resin pipes, and makes it possible to reliably switch piping from synthetic resin pipes to metal pipes.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of a concrete buried object equipped with a joint according to the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a perspective view of a protector, and Fig. 4 is a perspective view of a joint. , Figures 5 to 8 show the process of switching piping from synthetic resin pipes to metal pipes,
Figures 5 and 7 are side views, Figures 6 and 8.
The figure is a sectional view of the same, FIG. 9 is a sectional view showing another embodiment of a concrete buried object equipped with a joint according to the present invention, and FIG. 10 is a synthetic resin pipe using a conventional conduit end protector. FIG. 3 is a cross-sectional view showing the state of the piping that is switched from the metal pipe to the metal pipe. 1 is a protector, 2 is a connection point, 11 is a synthetic resin joint, 12 is a metal joint, P is a synthetic resin pipe,
M is a metal tube.

Claims (1)

[Scope of Claims] 1. An object buried in concrete that is equipped with a joint that connects a synthetic resin pipe buried within a concrete wall and a metal pipe that is piped outside the concrete wall, the object being made of synthetic resin and that connects the synthetic resin pipe. A fitting with a metal fitting that connects a metal pipe and a metal pipe with the metal fitting exposed so that the metal fitting is supported by concrete within a concrete wall. , a protective body to which the joint is attached, and a concrete buried object equipped with a joint.