JP2514389Y2 - Fire resistant trough - Google Patents

Description

[Detailed description of the device]

[0001]

FIELD OF THE INVENTION The present invention relates to a fire resistant trough for laying cables.

[0002]

2. Description of the Related Art Fire proof troughs are widely used for laying cables. As shown in FIG. 7, a conventional fireproof trough for laying cables has been manufactured by stacking a pair of members 1 each having a substantially U-shaped cross section so that their openings are aligned. This trough member 1 was made of concrete or fiber reinforced plastic. Further, this member 1 was manufactured by using a mold different for each size.

In this refractory trough, a mold is required to manufacture the member 1, so that the price is high.
In addition, in order to change the size, it is necessary to replace the entire member 1 with a different size, and because the amount of cable to be laid is different from the plan, the size of the trough must be changed on-site. In this case, there was a problem that it was difficult to deal with.

As a refractory trough capable of solving such a problem, the one shown in FIG. 8 has been proposed. This trough is formed by cutting four fire-resistant plates made of calcium silicate or the like and combining a plurality of fire-resistant plates 2 into a rectangular cross section. In this trough, a joining member 3 having a U-shaped cross section shown in FIG. 9 is provided along both side edges of the upper refractory plate 2 and the lower refractory plate 2 as shown in FIG.
As shown in FIG. 0, it is attached by using screws 4, and the fireproof plate 2 forming a side portion is fitted in the joining member 3 as shown in FIG.

Since this trough uses the refractory plate 2 manufactured by cutting the plate, it can be manufactured without using a die, and there is an advantage that the cost can be reduced. Further, this trough has the advantage that the size can be changed only by exchanging the refractory plate 2 with one having a different width, and the size change on site can be easily dealt with.

However, in this trough, a gap is likely to be formed between the fireproof plate 2 and the joining member 3, and there is a problem that hot air enters the inside through the gap during a fire. Further, in this trough, the joint member 3 and the fireproof plate 2 fastened with screws undergo different thermal deformations as the temperature rises in the event of a fire, and a large gap is created in the joint portion, and a large amount of hot air enters the trough. There are also problems.

In order to cope with such a problem, the inventor of the present invention replaces the joining member 3 of the trough with a joining member 5 having a T-shaped cross section as shown in FIG. 12 as shown in FIG. A prototype of a trough fixed to the plate 2 with screws was examined.

[0008] However, when this trough was tested, it was found that even in this trough, a large amount of hot air intruded from the joint with time at the time of fire, and it was difficult to sufficiently perform the function as a fire resistant trough.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an excellent fireproof function to a trough of a type that can be easily changed in size and is inexpensive.

[0010]

In order to achieve the above object, in the refractory trough of the present invention, a plurality of refractory plates are used as the joining members 7, and side edges of the first refractory plate 2 as shown in FIG. And a U-shaped portion 8 having a substantially U-shaped cross section and an L-shaped portion 9 having a substantially L-shaped cross section, and the first U-shaped portion 8 is formed. An L-shaped portion 9 and a portion 14 corresponding to a U-shaped vertical bar in a state where a portion 12 corresponding to a U-shaped horizontal bar and a portion 11 corresponding to an L-shaped vertical bar are overlapped with each other and L The portion 13 corresponding to the horizontal bar of the letter is provided so as to form a second recess 16 into which the side edge portion of the second fire-resistant plate 2 is inserted, and the U-shaped portion is provided. The portion 8 and the L-shaped portion 9 are the overlapped portion 1
It is characterized in that it is assembled in a quadrangular cross section by using a member that is joined over the entire length at a position away from a portion 14 corresponding to a U-shaped vertical bar of 8. The U-shaped section 8 and the L-shaped section 9 of the joining member 7 can be joined by welding, mechanical crimping, or the like. However, as shown in FIG. It is also possible to manufacture an integrated joining member 7 by forming the substantially U-shaped portion 8 and the L-shaped portion 9.

[0011]

In the trough of the present invention having the above-mentioned structure, the refractory plate 2 inserted into the first recess 10 has three side surfaces, that is, the front surface, the back surface and the end surface, which are substantially U-shaped in cross section. Is covered by a U-shaped portion 8. Further, the side edge of the fireproof plate 2 inserted into the second recess 16 has an L-shaped portion 9 having an L-shaped cross section of the joining member 7 on the front surface and the end surface, and a U-shaped portion 8 on the back surface. It is covered, and also the front, back and end faces are covered. As a result, this trough makes it difficult for hot air to enter the interior from the connection part during a fire.

The trough of this embodiment is shown in FIG.
As shown in FIG. 3, the joint member 7 is separated from a portion 14 which is an overlapping portion of the substantially U-shaped section 8 and the L-shaped section 9 and which corresponds to a U-shaped vertical bar of the substantially C-shaped section 8. Since it is joined over its entire length at a different position, the overlapping portion 18
A gap 22 communicating with the second recess 16 is formed in the. Therefore, by inserting the connecting member 20 having an L-shaped cross section along the inner surface of the L-shaped portion 9 into the gap 22, the two connecting members 7 can be firmly connected. Further, when the connecting member 20 is inserted into the gap 22 in this manner, the first recess 10 and the second recess 1 are also formed in the connected parts of the joining members 7, 7.
Since 6 is shielded from the outside and gas is difficult to flow in, it is possible to prevent hot air from entering from the portion where the joining member 7 is connected.

[0013]

EXAMPLE 1 FIG. 1 shows an example of the fire resistant trough of the present invention. The trough of this embodiment has a rectangular cross section assembled by four fireproof plates 2 and four joining members 7. The fireproof plate 2 is a calcium silicate fireproof plate (Keikalite SG manufactured by Furukawa Electric Co., Ltd., thickness 25 mm).
Is used.

The joining member 7 is manufactured by bending a stainless steel plate having a thickness of 1.2 mm.
As shown in FIG. 5, the cross section is composed of a substantially U-shaped portion 8 and an L-shaped portion 9. The U-shaped portion 8 has a U-shaped cross section. That is, the portions 12 and 12 corresponding to the U-shaped horizontal bar and the portions 14 corresponding to the U-shaped vertical bar are formed. The space inside the U-shaped portion 8 is a first recess 10 into which the side edge of the fireproof plate 2 is inserted. The L
The character-shaped portion 9 is formed to have a substantially L-shaped cross section. That is, it is formed by a portion 11 corresponding to an L-shaped vertical bar and a portion 13 corresponding to an L-shaped horizontal bar. The substantially U-shaped section 8 and the L-shaped section 9 have a portion 1 corresponding to an L-shaped vertical bar.
A portion 1 corresponding to an L-shaped horizontal bar of the L-shaped portion 9 is overlapped with a portion 12 corresponding to a U-shaped horizontal rod, and a vertical bar of a U-shaped portion 8 corresponding to an L-shaped horizontal rod of the L-shaped portion 9. Is arranged in a state of being vertically separated from the portion 14 corresponding to. Then, between the portion 13 corresponding to the L-shaped horizontal bar and the portion 14 corresponding to the U-shaped vertical bar, the second concave portion 16 into which the side edge portion of the heat-resistant plate 2 is inserted.
Are formed.

These cross-section substantially U-shaped portion 8 and L-shaped portion 9
Is made by bending one plate,
The end of the portion 11 corresponding to the L-shaped vertical bar and the end of the portion 12 corresponding to the U-shaped horizontal bar overlapped with this are continuous. As a result, this joining member 7 is
In a portion (hereinafter, abbreviated as an overlapping portion) 18 provided in an overlapping state, the section-shaped portion 8 and the L-shaped portion 9 have a total length apart from a portion 14 corresponding to a U-shaped vertical bar. It is in a state of being joined across.

In this joining member 7, the substantially U-shaped section 8 and the L-shaped section 9 are joined at their overlapping portions 18 as described above, so that the overlapping portions 18 are A gap 22 communicating with the second recess 16 is formed.

As shown in FIG. 3, the trough of this embodiment is assembled by inserting the edge portions of the refractory plate 2 into the first recess 10 and the second recess 16 of the joining member 7. The refractory plate 2 inserted in the second recess 16 and the joining member 7 are fixed by screws 4 at a position 13 corresponding to a horizontal bar having a substantially U-shaped cross section.

When connecting the joining members 7 of the trough, as shown in FIG. 4, a connecting member 20 having an L-shaped cross section is used. That is, as shown in FIG.
The connecting member 20 is inserted along the inner surface of the L-shaped portion 9 to connect the two joining members 7. At this time, the connecting member 20
One end of is inserted into the gap 22 of the overlapping portion 18 of the joining member 7.

Since the refractory trough of this embodiment is constructed as described above, the three sides of the side edge of the fireproof plate 2 inserted into the first recess 10, that is, the three sides of the front side, the back side and the end side. Are covered by a U-shaped portion 8 having a substantially U-shaped cross section. In addition, the side edge of the fireproof plate 2 inserted into the second recess 16 is covered with an L-shaped portion 9 having a L-shaped cross section and a U-shaped portion 8 on the front surface and the end surface of the joining member. Also, all three surfaces of the front surface, the back surface, and the end surface are covered. As a result, this trough becomes highly reliable with excellent fire resistance, because hot air during a fire is unlikely to enter from the connection part.

The trough of this embodiment is shown in FIG.
As shown in FIG. 4, from the portion 14 where the substantially U-shaped section 8 and the L-shaped section 9 of the joining member 7 are overlapping portions 18 and correspond to the U-shaped vertical bar of the U-shaped section 8. Since they are joined at the distant positions over the entire length, a gap 22 communicating with the second recess 16 is formed in the overlapping portion 18. By inserting the connecting member 20 having an L-shaped section along the inner surface of the substantially L-shaped section 9 into the gap 22, the two connecting members 7 can be firmly connected. Further, when the connecting member 20 is inserted into the gap 22 in this manner, the first recess 10 and the second recess 1 are also formed in the portion where the joining members 7, 7 are connected.
6 is cut off from the outside, and it becomes difficult for gas to flow in.
Therefore, this trough has an advantage that the joining member 7 can be easily and mechanically strongly connected and that hot air can be prevented from entering from a portion where the joining members 7 are connected.

(Embodiment 2) FIG. 6 shows a joining member 7 used in this embodiment.
In the trough of this example, the joining member 7 in which the thermal expansion refractory material 23 was laminated on the inner surface of each of the first recess 10 and the second recess 16 was used. These heat-expandable refractory materials 23 are strip-shaped, and the surfaces with which the end surfaces of the fire-resistant plate 2 come into contact, that is, the portions 11 and the U-shaped portions 9 corresponding to the L-shaped vertical bars of the substantially L-shaped section 9 are shown. It is laminated in a portion 14 corresponding to a vertical U-shaped bar. As the heat-expandable refractory material 23, Dunseal F (trade name; manufactured by Furukawa Electric Co., Ltd.), which foams when heated and changes into an ash product with excellent heat insulation, can be used.

In the trough of this example, the recess 1 of the joining member 7 is used.
Since the heat-expandable refractory material 23 is disposed on the Nos. 0 and 16 as described above, when the trough is heated during a fire or the like, the heat-expandable refractory material 23 expands to cause a space between the fire-resistant plate 2 and the joining member 7. Since the gap is closed, the airtightness of the trough is further enhanced, and the entry of hot air can be more reliably prevented. Therefore, this trough becomes more reliable.

(Comparative Test) The trough of Example 1 shown in FIG. 1, the conventional trough shown in FIG. 8 (Comparative Example 1), and the conventional trough shown in FIG. 13 (Comparative Example 2) were manufactured. Then, this was placed in a gas-fired refractory furnace and heated according to the fire heating curve specified in JIS A1304, and the temperature of the surface A of the cable 23 loaded in the trough as shown in FIG. 1 was measured. As the refractory material 2 forming the trough, a calcarete SG (trade name; manufactured by Furukawa Electric Co., Ltd.) having a thickness of 25 mm was used. The outer dimensions of the trough section are 400 mm x 4000 mm, and the inner dimensions are 350 mm.
It was × 350 mm. The results are shown in Table 1.

[0024]

[Table 1]

From the results shown in Table 1, it was confirmed that the trough of Example 1 had a much slower rise in the surface temperature of the cable 23 and less intrusion of hot air into the trough as compared with the trough of Comparative Example.

[0026]

According to the fire resistant trough of the present invention having the above-mentioned structure, the side edge portion 3 of the fire resistant plate 2 inserted in the first recess 10 is
The surfaces, that is, the three surfaces of the front surface, the back surface, and the end surface are covered by the U-shaped portion 8 having a substantially U-shaped cross section. Further, the side edge portion of the fireproof plate 2 inserted into the second recess 16 is covered by the L-shaped portion 9 having an L-shaped cross section of the joining member on the front surface and the end surface and by the substantially U-shaped portion 8 in the back surface. It is also covered, and all three surfaces of the front surface, the back surface, and the end surface are covered. As a result, in the event of a fire, this trough is unlikely to allow hot air to penetrate into the interior from the connection portion, and has an excellent fire resistance function and high reliability.
Further, in the trough of the present invention, the substantially U-shaped section 8 and the L-shaped section 9 of the joining member 7 are overlapped with each other 18
And, since it is joined over the entire length at a position away from the portion 14 corresponding to the U-shaped vertical bar of the substantially U-shaped section 8, the overlapping portion 18 communicates with the second concave portion 16. A gap 22 is formed. Therefore, the two connecting members 7 can be firmly connected by inserting the connecting member 20 having an L-shaped section along the inner surface of the substantially L-shaped section 9 into the gap 22. Further, in this way, the connecting member 20 is provided with the gap 22.
In this case, the first recess 10 and the second recess 16 are blocked from the outside even in the portion where the connecting members 7, 7 are connected to each other, so that the gas is difficult to flow into. Therefore, this trough has an advantage that the joining member 7 can be easily and mechanically strongly connected and that hot air can be prevented from entering from a portion where the joining members 7 are connected.

[Brief description of drawings]

FIG. 1 is a sectional view showing a trough according to a first embodiment.

FIG. 2 is a perspective view showing a joining member that constitutes the trough of the first embodiment.

FIG. 3 is a cross-sectional view showing a portion to which the refractory plate of the trough of the first embodiment is joined.

4A and 4B are views for explaining a method of connecting the joining members according to the first embodiment, where FIG. 4A is a perspective view seen from the outside, and FIG.
Is a perspective view seen from the inside.

FIG. 5 is a cross-sectional view showing a connected portion of the joining member.

FIG. 6 is a perspective view showing a joining member used in the trough of the second embodiment.

FIG. 7 is a cross-sectional view showing a trough of a first conventional example.

FIG. 8 is a sectional view showing a trough of a second conventional example.

FIG. 9 is a perspective view showing a joining member used in the trough of the second conventional example.

FIG. 10 is a cross-sectional view showing a state in which the joining member of the second conventional example is attached to a fireproof plate.

FIG. 11 is a cross-sectional view showing a joined portion of the fireproof plates of the second conventional example.

FIG. 12 is a perspective view showing a joining member previously examined by the present inventor.

FIG. 13 is a cross-sectional view showing a state in which the joining member previously examined by the present inventor is attached to a fireproof plate.

FIG. 14 is a cross-sectional view showing a state in which a fireproof plate is joined by the joining member previously examined by the present inventor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Member 2 Fireproof plate 3 Joining member 4 Screw 5 Joining member 7 Joining member 8 Sectional U-shaped section 9 Section L-shaped section 10 First recess 11 Section corresponding to a vertical bar of section L-section 12 Horizontal section of section U-shape Part corresponding to a bar 13 Part corresponding to a horizontal bar having an L-shaped cross section 14 Part corresponding to a vertical bar having a U-shaped cross section 16 Second recess 18 Overlapping part 20 Connecting member 22 Gap 23 Cable A surface

Claims (1)

(57) [Scope of utility model registration request] 1. A refractory trough formed by assembling a plurality of refractory plates 2 with a joining member 7 in a rectangular cross section, wherein the joining member 7 has a side edge portion of the first refractory plate 2 inserted therein. A U-shaped portion 8 having a substantially U-shaped cross section that forms one concave portion 10.
And an L-shaped portion 9 having a substantially L-shaped cross section, and the U-shaped portion 8 and the L-shaped portion 9 correspond to a U-shaped horizontal bar and a L-shaped vertical portion. Place 1 corresponding to a U-shaped vertical rod in a state where the portion 11 corresponding to a bar is overlapped.
4 and a portion 13 corresponding to an L-shaped horizontal bar are provided so as to be spaced apart from each other so as to form a second concave portion 16 into which the side edge portion of the second refractory plate 2 is inserted, and The U-shaped portion 8 and the L-shaped portion 9 are the overlapped portion 18
A fire-resistant trough, characterized in that it is joined over the entire length at a position away from a point 14 corresponding to a U-shaped vertical bar.