JPH1054065A - Connecting structure of fire-resistive double pipe and connecting structure of pipe utilizing socket used for connecting structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quicken connection works while surely shielding an inner pipe by filling a joint filling section installed on the opening section side of the end section of an outer pipe housed in an outer-pipe housing section formed to a socket with a joint filler and connecting a fire-resistive double pipe to the socket. SOLUTION: An inner pipe 12 is inserted on the inner circumferential side of a packing 14 mounted to the interior section of a socket 2, and a section between the outer circumferential surface of the inner pipe 12 and the inner circumferential surface of the socket 2 is interrupted in a watertight manner. A flange section 2a in constant width is formed on the inner circumferential surface of the socket 2, the side nearer to an opening than the packing 14, extending over the whole circumference. An outer-pipe housing section 15 having a constant inside diameter is formed on the opening side of the flange section 2a extending over the whole circumference, and an outer-pipe end section 13a is inserted. A joint-filler filling section 16 having a large diameter and a fixed depth is formed on the opening side of the outer-pipe housing section 15 extending over the whole circumference, and the outer-pipe end section 13a is interrupted surely from the outside by filling the filling section 16 with a joint filler 17. A connecting section can be interrupted certainly regardless of the conditions of cutting because a section not housed in the outer-pipe housing section is coated with the joint filler 17, not the cutting section of an outer pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for a fire-resistant double-layer pipe in which a hard vinyl chloride pipe (hereinafter, also simply referred to as "inner pipe") is covered with an outer pipe formed of fiber mortar, and the connection structure. The present invention relates to a pipe connection structure using a receiving port.

[0002]

2. Description of the Related Art Generally, when an outer tube is cut by hand at a connection site of the fire-resistant double-layer tube, the cut surface becomes slightly inclined, uneven, or lacks in dimensions with respect to the tube axis. If it is connected to the pipe joint as it is, a gap is formed between the pipe joint and the end face of the socket. In addition, if this type of fire-resistant double-layer pipe is roughly handled at the site of the work, the end of the outer pipe may be cracked or damaged, and in this case, a gap is formed between the end face of the fitting and the socket end. Occurs.

If the gap formed between the outer tube and the end face of the receptacle is left as it is, there is a problem that the inner tube is burned out in the event of a fire, and as a result, toxic gas is generated. For this reason, conventionally, as shown in FIG. 5, when connecting the refractory double-layer pipe 30 to the receiving port 31, conventionally, the agent 3 is applied over the entire circumference of the end of the outer pipe 30a.
2 was applied to block the end of the outer tube 30a from the outside, so that the fire resistance of the inner tube 30b was maintained.

[0004]

However, FIG.
As shown in (B), when the cutting condition of the end portion 30c of the outer tube 30a is not good, it is necessary to apply the media 32 carefully, which is troublesome. The media 32 is shown in FIG.
As shown in (A), it is necessary to apply a predetermined size (width A, thickness B), but the actual application operation is often performed in a narrow place. In such a case, As shown in FIG. 5B, there is a possibility that an unpainted portion (a portion that is not applied at all) or an insufficient coating allowance (a portion where the above dimensions A and B are not secured) may occur. It took a long time for the operation, and it was difficult to speed up the connection operation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a connection structure for a fire-resistant double-layer tube capable of speeding up the connection work while reliably shielding the inner tube, and a receptacle used in the connection structure. It is an object of the present invention to provide a pipe connection structure using a pipe.

[0006]

For this purpose, in the connection structure according to the first aspect, the outer tube end is accommodated in the outer tube accommodating portion provided in the receptacle, and is provided on the opening side of the outer tube accommodating portion. It is characterized in that the medium filling portion is filled with a medium and a refractory double-layer tube is connected to the receptacle.

[0007] According to this connection structure, the outer tube end is housed in the outer tube housing of the receptacle, and the medium is filled in the medium filling portion, so that the outer tube is not housed in the outer tube housing of the outer tube. A media is applied to the portion, which ensures that the outer tube end and thus the inner tube are shielded from the outside. In this way, the media is not applied to the cut portion of the outer tube as in the prior art, but is applied to a portion farther away than this, that is, a portion that is not housed in the outer tube housing portion, Reliable application can be performed irrespective of the cutting condition of the outer tube end.

Further, since the media is filled in the media-filled portion, ironing is not required, and escape of the media at that time is prevented. Can be easily applied without the risk of causing the problem, and thus, even in a place where the application work is difficult such as a narrow place, a reliable application of the media can be performed more quickly than before. .

The connecting structure according to a second aspect is a structure for connecting a pipe having substantially the same diameter as the inner pipe of the refractory double-layer pipe to the receptacle according to the first aspect, and filling the outer pipe housing with a noncombustible material. After doing
The medical agent filling section is filled with a medical agent, and the tube is connected to the receptacle.

According to this connection structure, a pipe having substantially the same diameter as the inner pipe, for example, a normal steel pipe, can be connected to the receiving port instead of the refractory double-layer pipe. In this case, the inside of the receptacle, for example, the end of the packing is exposed to the outside through the media filling portion and the gap between the outer tube accommodating portion and the tube (so-called apparent portion) if the connection is made as it is. Would. Therefore, the outer tube receiving portion of the receptacle is filled with a non-combustible material such as glass wool, rock wool or mortar, and the outer tube receiving portion is filled. By filling, the visible portion can be covered to prevent burning of the packing and the like.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
A description will be given based on FIG. FIG. 2 shows the drainage main pipe 10 or the horizontal branch pipe 1 in each of the receiving ports 2, 3, and 3 of the drainage vertical pipe joint 1.
An example of piping construction connecting the first and the first pipes 11 is shown. In addition,
In the figure, reference numeral 4 denotes a toilet bowl, and reference numeral 5 denotes a concrete slab that partitions an upper floor and a lower floor.

The drainage main pipe 10 and the horizontal branch pipe 11 are both fire-resistant double-layer pipes.
Since the connection structure for the third and third members is the same, the connection structure of the drainage main pipe 10 to the receptacle 2 will be described below.

FIG. 1 shows a connection structure of a drainage main pipe (hereinafter, simply referred to as a fire-resistant double-layer pipe) 10 to a receiving port 2. The refractory double-layer pipe 10 is obtained by coating an outer pipe 13 made of fiber mortar on an outer peripheral surface of an inner pipe 12 made of hard vinyl chloride, and an end 13 a of the outer pipe 13 is an end of the inner pipe 12. The portion is cut at a position where the portion is exposed to a certain size.

The refractory double-layer pipe 10 whose outer tube end 13a has been cut in this way is inserted into the receptacle 2 and connected. A substantially cylindrical packing 14 is attached to the back of the receiving port 2, and the inner pipe 12 is inserted into the inner peripheral side of the packing 14. The packing 14 blocks the outer peripheral surface of the inner tube 12 and the inner peripheral surface of the receiving port 2 in a watertight manner over the entire circumference.

The inner peripheral surface of the receiving port 2
A flange portion 2a having a constant width is formed on the entire opening side (the upper side in the figure, hereinafter the same), and the outer tube housing portion 1 having a constant inner diameter is formed on the opening side of the flange portion 2a.
5 is formed over the entire circumference, and the outer tube end portion 13a is inserted into the outer tube accommodating portion 15. The fire-resistant double-layer pipe 10
Is inserted until the distal end portion of the outer tube end portion 13a, that is, the cut portion thereof substantially contacts the flange portion 2a.

On the opening side of the outer tube accommodating portion 15, a medium filling portion 16 having a larger diameter than that of the outer tube accommodating portion 15 is formed at a constant depth over the entire circumference. The diameter of the media filling portion 16 is
The thickness of the filling allowance of the media 17 between the outer tube 13 and the outer tube 13 is set to a diameter at which at least B dimension is secured on one side, and the depth of the filling allowance including the depth of the outer tube accommodating portion 15 is included. The width is set to a depth at which the dimension A is secured at least. For this reason, when the medium filling section 16 is filled with the medium 17,
The media 17 is applied at least in the dimension of width A × thickness B, so that the outer tube end 13a is reliably shut off from the outside.

According to the connection structure of the present embodiment configured as described above, since the messing agent 17 is applied to the portion of the outer tube 13 that is not accommodated in the outer tube accommodating portion 15, the mesing agent 17 is applied. Can be applied without considering the cutting condition of the outer tube end 13a at all, so that the application can be performed more reliably than in the past.

Moreover, since the media 17 is applied to at least the width A × the thickness B when the media 17 is filled in the media filling portion 16, it is not necessary to perform ironing as in the prior art.
In addition, the escape of the media 17 at that time is reduced, and as a result, there is no occurrence of the remaining unpainted portion and insufficient coating allowance as in the related art. It can be done faster and easier than before.

Next, FIG. 4 shows a case where a pipe 20 different from the fire-resistant double-layer pipe 10 is connected by using the above-mentioned receiving port 2. The pipe 20 in this case is a lining steel pipe in which a hard vinyl chloride resin is coated on the outer peripheral surface of the steel pipe 21, and the outer diameter thereof is substantially the same as the outer diameter of the inner pipe of the fire-resistant double-layer pipe 10. . In addition, in the case of this tube 20,
Like the outer tube 13 in the refractory double-layer tube 10, the steel tube 2
No treatment is performed to cut or peel off the surface lining layer 22 in order to expose 1.

In the case of the connection structure of the pipe 20, the pipe 20 is also inserted into the inner peripheral side of the receptacle 2, and a similar packing 14 is interposed between the outer peripheral surface and the inner peripheral surface of the receptacle 2. Thereby, between the two 20 and 2 is watertightly shut off.

The outer tube receiving portion 15 includes the outer tube end 13a.
Instead, it is filled with a noncombustible material 18 made of glass wool. The non-combustible material 18 is filled so that the upper surface on the opening side substantially coincides with the bottom surface of the media filling portion 16. The non-combustible material 18 allows the flange 2a and the pipe 20
, That is, the visible portion is shielded from the opening side of the receiving port 2, whereby the end face of the packing 14 is protected from a flame or the like. The non-combustible material 18 may be made of other refractory materials such as rock wool or mortar in addition to the glass wool illustrated above.

The opening side of the non-combustible material 18 and the medium filling portion 17 are filled with the medium 17 in the same manner as described above, and the inside of the receptacle 2 is isolated from the outside. However, the filling amount of the media 17 is larger than that of the connection structure of the refractory double-layer pipe 10 by the amount of filling the opening side of the non-combustible material 18.

In this way, the receptacle 2 for connecting the fire-resistant double-layer pipe 10 can be diverted as a receptacle for connecting another kind of pipe 20. Even with this connection structure, the flame resistance of the packing 14 can be improved. (Function protected against flame) can be ensured.

Further, by adopting such a connection structure, the receptacle 2 can be shared when the fire-resistant double-layer pipe 10 and the lining steel pipe 20 are connected, and in this respect, the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the invention as set forth in claim 1, and is a partially broken side view showing a connection structure of a fire-resistant double-layer pipe.

FIG. 2 is a side view showing an example of pipe installation when the connection structure of the present invention is applied to connection between a drainage main pipe and a horizontal branch pipe.

FIG. 3 is an enlarged longitudinal sectional view showing a main part of FIG. 1;

FIG. 4 is a view showing an embodiment of the invention as set forth in claim 2, and is a partially cutaway side view showing a connection structure of a pipe different from a fire-resistant double-layer pipe.

FIG. 5 is a longitudinal sectional view showing a connection structure of a conventional fire-resistant double-layer pipe, in which (A) shows a state in which a media agent is correctly applied, and (B) shows a state in which a coating allowance is insufficient. Is shown.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drainage pipe joint 2, 3 ... Reception port 10 ... Fireproof double-layer pipe (Drainage standing pipe) 12 ... Inner pipe 13 ... Outer pipe, 13a ... Outer pipe end part 14 ... Packing 15 ... Outer pipe accommodation part 16 ... Media Agent filling part 17: Medication 18: Noncombustible material 20: Pipe (lining steel pipe) 21: Steel pipe 22: Lining layer A: Width of the media (for example, about 35 mm if the pipe diameter is 100 mm) B: Media of the media Wall thickness (for example, about 7 mm if the pipe diameter is 100 mm)

Claims (2)

[Claims] 1. A fire-resistant double-layer pipe in which an end of an outer tube is accommodated in an outer tube accommodating portion provided at a receiving port, and a medium is filled in a medium filling portion provided on an opening side of the outer tube end. Is connected to the receiving port. 2. A structure in which a pipe having substantially the same diameter as the inner pipe of the refractory double-layer pipe is connected to the receptacle according to claim 1, wherein the outer pipe housing is filled with a noncombustible material and then filled with a medium. A tube connecting structure, characterized in that a portion is filled with a medium and the tube is connected to the receptacle.