JP2000041321A - Sealing method of through-hole for wires and cables - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the sealing method of a through-hole for wires and cables which avoid malfunctioning of a control apparatus which is caused by the penetration of dust into a control panel, and can prevent an external fire from spreading along the wires and cables due to ventilation. SOLUTION: A cylindrical dustproof bag 4, which is made of flame-retardant/ inflammable fiber or made from flame-retardant/inflammable cloth and coated with flame-retardant rubber, is put on a cylindrical fixing part 5 provided around the aperture of a through-hole 1 and fixed to the cylindrical fixing part 5 by a tying band 6. Then, the bundle 2 of wires and cables is inserted through the through-hole 1 and the dustproof bag 4. The other end of the dustproof bag 4 is fixed to the bundle 2 of the wires and cables, which is inserted through the through-hole 1 and the dustproof bag 4 by a tying band 6 for sealing a gap between the through-hole 1 and the bundle 2 of the wires and cables.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire cable for sealing a gap between a through hole and an electric wire / cable bundle when the electric wire / cable bundle is passed through a through hole formed in a wall or a floor and introduced into a room or a control panel. It belongs to the technical field of sealing of through holes.

[0002]

2. Description of the Related Art Conventionally, when a cable bundle is passed through a through hole formed in a wall or a floor and introduced into a room or a control panel, as shown in FIG. Fillers 7 such as putty are filled between the through-hole 1 and the wire / cable bundle 2 and between the wire / cables 3 in the wire / cable bundle 2 in order to avoid the spread of the wire and cable during fire. Sealed.

[0003]

However, in the above-mentioned method, the gap between the through hole and the wire cable bundle and between the wire cables in the wire cable bundle is caused by shrinkage due to drying of the putty and deformation of the putty due to vibration of the wire cable. 12 occurs. If a gap is formed, the sealing property is broken, dust enters the control panel from the gap 12 and causes malfunction of the control device.Also, in the event of a fire, air flows through the gap 12 so that an external flame As a result, there is a problem that electric cables and electric devices in the control panel spread.

[0004] In the sealing work, if the through-hole is too large and there is a large gap between the wire and the cable bundle, the wire and cable bundle easily moves in the through-hole, and it becomes difficult to fill the putty. A gap is easily generated between the electric wire and the cable bundle. Conversely, if the through hole is made as small as possible, there is a problem that the wire / cable bundle is likely to be damaged by contacting the opening of the through hole.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and covers a cable dust bundle with a cylindrical dust bag.
By fixing the end of the covered dust bag on the through hole side to the wall or floor, and fixing the other end to the cable bundle to seal the gap between the through hole and the cable bundle, dust can enter the control panel. It is an object of the present invention to provide a method of sealing a cable through-hole for preventing a malfunction of a control device due to intrusion and a spread of the cable by an external flame caused by air flow.

[0006]

The gist of the present invention is to provide a cylindrical dust-proof structure in which a tubular fixing portion provided around an opening of a through hole is made of a flame-retardant non-combustible fiber or a flame-retardant rubber is coated on a flame-retardant non-combustible fiber cloth. After covering the bag and fixing the dustproof bag to the cylindrical fixing portion with a binding band, the wire cable bundle is passed through the through hole and the dustproof bag, and the other end of the dustproof bag is passed through the through hole and the dustproof bag. And a gap between the through-hole and the bundle of electric cables which is fixed by a binding band.

A cylindrical fixing device is fixed around the opening of the through-hole, and the fixing device is covered with a cylindrical dust-proof bag made of flame-retardant non-combustible fiber or flame-retardant non-combustible fiber cloth coated with flame-retardant rubber. After fixing to the tubular fixing device with a tying band,
Pass the cable bundle through the through hole and the dust bag, and secure the other end of the dust bag to the cable bundle passed through the through hole and the dust bag with a binding band to seal the gap between the through hole and the cable bundle. This is a method of sealing a through hole.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of sealing a through hole of an electric cable according to the present invention is as follows. An end of a cylindrical dustproof bag covering an electric cable is fixed to an opening of the through hole and the other end is an electric wire. This is a method of fixing to a cable bundle to seal a gap between an electric cable and a through hole. In this method, no putty is used for the seal, so there is no gap between the through hole and the wire / cable bundle or between the wire / cables in the wire / cable bundle due to shrinkage due to putty drying and deformation of the putty due to vibration of the wire / cable. . For this reason, the sealing method of the present invention can prevent dust and flame from entering the control panel, and eliminate malfunction of the control device.

Further, in this method, since the wire cable through-hole is sealed with a cylindrical dust-proof bag made of flame-retardant non-combustible fiber or flame-retardant non-combustible fiber cloth coated with flame-retardant rubber, air in the seal portion is not sealed. The circulation is so small as to be negligible, and the flame at the time of fire can be prevented from spreading to the electric cable since the dust bag serves as a barrier. Furthermore, by allowing the dust bag to have a margin, the wire / cable bundle can move freely with respect to the through hole without breaking the sealing performance.
By forming a through hole larger than the thickness of the wire / cable bundle, the contact between the wire / cable bundle and the opening of the through hole can be reduced, and damage to the wire / cable bundle can be prevented.

[0010]

Embodiment 1 FIG. 1 shows an example of a sealing method according to the present invention.
A cylindrical dust-proof bag 4 made of flame-retardant non-combustible fiber or a flame-retardant non-combustible fiber cloth coated with flame-retardant rubber is put on a raised cylindrical fixing part 5 provided around the opening of the through hole 1 opened in From above the bag 4, tighten with the binding band 6 to fix the tubular fixing portion 5.
Stick to After that, the wire cable bundle 2 is passed through the through hole 1 and the dustproof bag 4, and the other end of the dustproof bag 4 is fixed to the wire cable bundle 2 by tightening the binding band 6 from above the dustproof bag 4.
At this time, a filling 7 of non-combustible fiber or flame-retardant soft rubber (for example, sponge, silicone sealant or the like) is filled between the electric cables 2 in order to eliminate a gap between the electric cables 2, and a portion of the filling 7 is filled. Is fastened from above the dust-proof bag 4 with a binding band 6 to fix the dust-proof bag 4 to the wire / cable bundle 2.

In the example of the first embodiment, the individual electric cables 3 are handled as one electric cable bundle 2, and as described above, the non-combustible fiber or the flame-retardant soft rubber filler 7 is provided between the individual electric cables 3 as described above. By filling with, it is possible to reduce the intrusion of dust into the control panel and the flow of air. Therefore, as described above, dust can be prevented from entering the control panel, malfunction of the control device can be eliminated, and the dust bag 4 can be prevented.
Can be used as a fire barrier to prevent the spread of electric wires and cables in the event of a fire.

The following are used for the flame-retardant non-combustible fiber or the flame-retardant non-combustible fiber cloth used for the cylindrical dust-proof bag coated with the flame-retardant rubber. Aromatic polyamide fibers or aramid fibers are used for the flame-retardant and non-combustible fibers. These fibers do not dissolve and gradually decompose and carbonize at 400 ° C. For this reason, it exhibits a certain heat shielding effect against flames and high heat of 900 to 1500 ° C. In addition, flame-retardant non-combustible fiber cloth coated with flame-retardant rubber is made of glass fabric coated on both sides with silicon (Protec Sheet SG30) and carbon cloth inside (trade name carbon cloth # 3200CH) ) And use the one sewn. By sewing the glass cloth coated with silicon on both sides and the carbon cloth together, the cloth is insulated by the carbon cloth and the strength can be maintained by the glass cloth. Carbon cloth at 400 ° C for more than 30 minutes, glass fabric coated on both sides with silicon can withstand continuous 250 ° C temperature.

The binding band 6 is preferably made of metal and made of stainless steel which does not rust so as to withstand long-term use. In addition, as described above, the width of the binding band 6 is important to tighten the portion of the filler 7 between the electric wires 2.

[0014]

Embodiment 2 FIG. 2 shows an example of a sealing method according to the present invention.
A cylindrical dust-proof device 8 is fixed around the opening of the through hole 1 opened in the above, and the fixing device 8 is made of flame-retardant non-combustible fiber or flame-retardant non-combustible fiber cloth coated with flame-retardant rubber. The bag 4 is covered, and is fastened with the binding band 6 from above the dustproof bag 4 to be fixed to the tubular fixing device 8. After that, the wire cable bundle 2 is passed through the through hole 1 and the dustproof bag 4, and the other end of the dustproof bag 4 is fixed to the wire cable bundle 2 by tightening the binding band 6 from above the dustproof bag 4. A flange 9 is provided on the cylindrical fixing tool 8, and the flange 9 is fixed around the opening of the through hole 1 by a fixing tool 10 such as a screw. The advantage of using the tubular fixing device 8 is that the fixing device 8 can be fixed around the opening of the through hole 1 after the dustproof bag 4 is fixed to the fixing device 8.
Note that the second embodiment is a case of one wire cable bundle including a plurality of wire cables, but in the second embodiment, as in the first embodiment, each wire cable 3 is connected to one wire cable bundle. It can also be treated as 2.

A test was conducted on the sealing effect using the sealing method for the through hole of the electric cable shown in FIG. The results are shown below. As shown in FIG. 3, one chamber is divided into two chambers (A) and (B) by a central wall, and a wire / cable bundle 2 is passed through the wall as shown in FIG. .
Volume of each chamber is 10 m ^3. In the chamber (A), dust having an average particle diameter of 10 μm and a concentration of 0.2 g / Nm ³ is suspended, and the chamber (B)
Is dust-free and the chamber (A) pressure is + 0.49 × 10 ^{3 to} 0.98 × 10 ³ P
a (50-100 mmAq). On the other hand, the pressure in chamber (B) is
a (± 0 mmAq), sampled from the sampling port 13 after 30 minutes, and measured by the dust measurement method according to JIS Z 8808.
The dust amount of (B) was measured. As a result, the dust average particle diameter was 10
The dust concentration in the chamber (B) adjacent to the chamber (A) having a μm concentration of 0.2 g / Nm ³ was a dust average particle diameter of 1 μm and a concentration of 0.01 g / Nm ³ . Since there is almost no pressure difference in the normal case, the amount of dust moving through the seal is smaller than the above value. As described above, by using the cylindrical dust-proof bag made of flame-retardant non-combustible fiber or flame-retardant non-combustible fiber cloth coated with flame-retardant rubber for sealing the wire cable through-hole, the sealing effect against dust can be improved. Understand. T in the figure indicates a thermometer for measuring the temperature of each room.

Further, a test was conducted on the sealing effect between the chambers having different temperatures. The results are shown below. As shown in FIG. 4, one chamber is divided into two chambers (A) and (B) by a central wall, and a wire / cable bundle 2 is passed through the wall as shown in FIG. . Each room has a volume of 10m ³
It is. Moreover chamber (A) with the shutter 14 and the volume of 9.5 m ³ 0.
A chamber having a volume of 0.5 m ³ is partitioned as 5 m ³ , as shown in (a). In this state, the chamber (A) having a volume of 9.5 m ³ is heated by the burner 15 and heated up to 400 ° C. After that, the shutter 14 is opened, and the chamber (a) and the chamber (a) are opened.
The temperature change of (B) was measured. Room (A) temperature 400 during test
It was kept at ± 30 ° C. The result is shown in FIG. The partition wall is a concrete wall with a thickness of 150 mm, and an exhaust port 16 with a diameter of 200 mm is provided in the upper part of the room (A). The temperature change in the room (a) was measured by a temperature indication control recorder (TICR), and the temperature change in the room (B) was measured by a temperature measurement recorder (TIR).

As shown in FIG. 5, when the shutter 14 is opened, the temperature of the chamber (a) rises to near 400 ° C. in 10 minutes. On the other hand, the temperature of the chamber (B) does not change for 10 minutes, and after 20 minutes.
The temperature rose by 20 ° C after 5 ° C and 40 minutes. In this way, the use of a cylindrical dust-proof bag made of flame-retardant non-combustible fiber or flame-retardant non-combustible fiber cloth coated with flame-retardant rubber for sealing the cable cable through-holes reduces air circulation. I understand.

[0018]

As is apparent from the above description,
The method for sealing the through-holes of the electric wire and cable according to the present invention uses a cylindrical dust-proof bag made of a flame-retardant non-combustible fiber or a flame-retardant rubber coated on a flame-retardant non-combustible fiber cloth. It is possible to prevent the malfunction of the control device due to intrusion into the air and the spread of the electric cable by the flame from the outside due to the circulation of the air. In addition, since a cylindrical dust-proof bag is used for the seal, the through hole can be made larger than the thickness of the wire / cable bundle, and the wire cable is also prevented from being damaged by contacting the opening of the through hole. be able to. Furthermore, by forming the fixing device into a two-part shape, the sealing method can be applied to the already laid wire cable through hole.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a method for sealing a through hole of an electric cable according to the present invention according to a first embodiment.

FIG. 2 is an explanatory view of a method for sealing an electric cable through hole according to the present invention in a second embodiment.

3 is an explanatory view of a sealing test method using the sealing method of the electric wire / cable through hole shown in FIG. 2;

FIG. 4 is an explanatory diagram of a method of testing a seal between chambers having different temperatures using the method for sealing an electric wire / cable through hole shown in FIG. 2;

FIG. 5 is a diagram showing the results of a seal test between chambers at different temperatures.

FIG. 6 is an explanatory view of a conventional method for sealing a through hole of an electric cable.

[Explanation of symbols]

1: through hole, 2: electric cable bundle, 3: electric cable,
4: dustproof bag, 5: tubular fixing portion, 6: binding band, 7: filler, 8: fixing device, 9: flange, 10: fixing device, 11 ...
Floor, 12 gap, 13 sampling port, 14 shutter,
15: burner, 16: exhaust port, T: thermometer, TICR: temperature instruction control recorder, TIR: temperature measurement recorder.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Ashida 1 Kanazawa-cho, Kakogawa-shi, Hyogo Prefecture Shinko Mex Co., Ltd. Kakogawa Works (72) Inventor Ryo Shimoda 2-2-2 Isogami-dori, Chuo-ku, Kobe-shi, Hyogo Prefecture. 21 Gouda Kobe Division (72) Inventor Seijiro Takenobu 1-68-82 Numa, Yao-shi, Osaka Rubber Material Real Co., Ltd. F-term (reference) 5G363 AA05 BA01 CA01 CB11

Claims (2)

[Claims] 1. A tubular dust-proof bag made of a flame-retardant non-combustible fiber or a flame-retardant rubber coated on a flame-retardant non-combustible fiber cloth is put on a tubular fixing portion provided around an opening of a through-hole. After being fixed to the cylindrical fixing portion with a binding band, the electric wire cable bundle is passed through the through hole and the dustproof bag, and the other end of the dustproof bag is fixed to the electric wire cable bundle passed through the through hole and the dustproof bag with the binding band and penetrated. A method of sealing an electric wire cable through hole, characterized by sealing a gap between the hole and the electric cable bundle. 2. A cylindrical dust-proof bag having a tubular fixing device fixed around the opening of the through hole, and a tubular dust-proof bag made of flame-retardant non-combustible fiber or flame-retardant rubber coated on a flame-retardant non-combustible fiber cloth. After covering and fixing to the cylindrical fixing device with a binding band, the electric wire cable bundle is passed through the through hole and the dustproof bag, and the other end of the dustproof bag is fixed to the electric wire cable bundle passed through the through hole and the dustproof bag with the binding band. And sealing a gap between the through-hole and the bundle of electric wires and cables.