JPH0750822Y2 - Fireproof duct connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a connection structure in a fireproof duct used for a wire cover that supports a communication cable or the like.

[Conventional technology]

Conventionally, this kind of wire cover for a communication cable is arranged in a structure such as a building or a gallery to support the communication cable and prevent it from being exposed to the outside.

However, in such a conventional cable rack, since a communication cable is simply placed, no protection can be provided even if, for example, a fire occurs and the communication cable touches the fire.

Therefore, for example, in U.S. Pat.No. 4,064,359, U.S. Pat.No. 4,276,332, etc., it has been proposed to cover the communication cable with a heat insulating material or to surround it and mount it in a box-shaped frame. .

According to this method, even if, for example, a fire occurs, the communication cable is not exposed to the fire. Therefore, it is possible to protect the communication cable according to the heat insulation performance of the heat insulating material, and to eliminate the trouble caused by the disconnection of the communication cable. I can.

[Problems to be solved by the device]

However, in this method, since each box-shaped frame is connected to form a heat insulating structure having a predetermined length, a gap is formed at the joint with the heat insulating material of each frame at each connection. If the area is exposed to a fire, the internal communication cable may be adversely affected.

The present invention has been made to solve such a conventional problem, and an object thereof is to provide a connection structure of a fireproof duct that prevents a fire from entering from a connection portion of each box-shaped frame. is there.

[Means for Solving the Problems]

The fireproof duct connection structure according to claim 1 is a fireproof structure in which a heat insulating material is provided inside, and four plate-shaped wall materials for forming side walls, a bottom portion, and a ceiling portion are connected in a box-shaped cross section. In the fire-resistant duct that connects the duct units, arranges communication cables, etc. through the above-mentioned heat insulating material, and is arranged in the structure through the support tool, the lengths of both side walls and the bottom wall are approximately the same. Two substantially L-shaped metal corner members are attached to each wall member, one end portion of the wall member forms an insertion tongue protruding from one end portion of the metal corner member, and the other end portion is formed. A fitting portion for fitting the insertion tongue portion is formed closer to the one end portion side than the other end portion of the metal corner member, and a heat insulating material is not provided on the bottom portion of the insertion tongue portion and the fitting portion. In addition, a plurality of refractory duct units each having a joining flange provided at a portion where this heat insulating material is not provided By inserting the insertion tongue provided at the end into the mating fitting part, back-to-back with the joining flanges and fixing them with bolts, etc., the tip of each joining flange is bent and connected to the bottom side. is there.

In the connection structure of the fireproof duct according to claim 2, when the joining flanges according to claim 1 are back-to-back, two plate members are inserted, and the joining flanges are fixed together with the plate members by bolts or the like, and then both plate members are joined together. Is configured to be bent toward the bottom side.

The fireproof duct connection structure according to claim 3 is a fireproof structure in which a heat insulating material is provided inside and four plate-like wall materials for forming side walls, a bottom and a ceiling are connected in a box-shaped cross section. In the fire-resistant duct that connects the duct units, arranges communication cables, etc. through the above-mentioned heat insulating material, and is arranged in the structure through the support tool, the lengths of both side walls and the bottom wall are approximately the same. Two substantially L-shaped metal corner members are attached to each wall member, one end portion of the wall member forms an insertion tongue protruding from one end portion of the metal corner member, and the other end portion is formed. A fitting portion for fitting the insertion tongue portion is formed closer to the one end portion side than the other end portion of the metal corner member, and a heat insulating material is not provided on the bottom portion of the insertion tongue portion and the fitting portion. In addition, a plurality of refractory duct units each having a joining flange provided at a portion where this heat insulating material is not provided The insertion tongue provided at the end is fitted into the mating fitting on the mating side, the joining flanges are back-to-back, and a U-shaped plate is inserted between them. The cover is attached and connected.

[Action]

In the connection structure of the fireproof duct according to claim 1, since the insertion tongue portion and the fitting portion are formed at both ends of the fireproof duct unit, the insertion tongue portion can be inserted into the fitting portion. . Next, after the joining flanges provided on both sides are back-to-back, they are fixed by bolts and the like, and by further bending both joining flanges toward the bottom side, they are joined securely to prevent both from separating. It is possible to prevent the joint from becoming an obstacle when arranging a communication cable or the like.

Further, in the fireproof duct connecting structure according to claim 2, since a plate material having a height higher than these is inserted between both joining flanges, and the plate material is bent toward the bottom side, the joining flange is directly connected. It can be processed more easily than bending.

Furthermore, in the fireproof duct connection structure according to claim 3,
After attaching the joining flanges back to back and inserting a plate with a U-shaped cross section between them, a cover with a U-shaped cross section is attached to this fixing part to ensure reliable joining and to prevent the two from coming off. At the same time, it is possible to prevent this joint from becoming an obstacle when arranging a communication cable or the like.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, 10 is a fireproof duct,
It is formed by appropriately connecting a fireproof duct unit A composed of a plurality of box-shaped bodies 20 having a substantially U-shape and a ceiling wall 30 placed on the upper portions of both side walls of each box-shaped body 20. ing.

The plurality of box-shaped bodies 20 each having a substantially U-shape have a predetermined temperature (for example, 12
When heated above 0 ℃, several times (volume expansion coefficient is 8 on average)
A plate-shaped foam material that expands to double the volume and a metal plate that is attached to the inside of the plate-shaped wall material with a predetermined length (for example, the product name of Sumitomo 3M Ltd .: FS
-195RR sheet) 21 is formed by two metal corner members 22 having a substantially L-shape having a length substantially equal to that of the wall member 21, and one end portion 211 of the wall member 21 has the corner member made of the metal. While forming the insertion tongue portion 23 protruding from the one end portion 221 of 22
The top wall 3 is formed so that the other end 212 is closer to the one end 211 side than the other end 222 of the metal corner member 22 and forms the fitting portion 24.
It is a combination of three sides except 0.

A communication cable 50 is placed on the bottom wall 25 of the box-shaped body 20, and a heat insulating material 26 is arranged to prevent heat from being transferred to the communication cable 50 in the event of a fire. It is desirable to use a calcium silicate plate having a thickness of about 25 mm as the heat insulating material 26, but a glass fiber plate, a gypsum board, a heat resistant synthetic resin plate or the like may be used.

In addition, at both ends of the bottom wall 25 of the box-shaped plate 20, a portion where the heat insulating material 26 is not placed is formed, and a joining flange 27 for joining with the adjacent box-shaped plate 20 is attached here. There is.

Further, inside the both side walls 28 of the box-shaped plate 20, another plate-shaped foam ceramic material 29 having substantially the same length as the heat insulating material 26 is attached. The foam ceramic material 29 is a heat insulating material 26.
Similarly, in order to prevent heat from being transferred to the communication cable 50 in the case of a fire. This foam ceramic material 29
As the product name of Sumitomo 3M Co., Ltd .: Matt
M20 is preferred. This material has a certain temperature (eg 350
When heated to a temperature of ℃ or more, several times (volume expansion coefficient is 3 to 4 on average)
Expands to double the volume.

Also, a heat insulating material attached to the inside of both side walls 28 of the box-shaped body 20.
Joining plates 40, 41 for joining adjacent box-shaped bodies 20 are fixed to both sides of 26 with screws or the like.

On the other hand, the ceiling wall 30 covers the upper opening portion of the box-shaped body 20, and when heated to a predetermined temperature (for example, 120 ° C.) or more like the box-shaped body 20, several times (the volume expansion coefficient is average). Plate-shaped foam ceramic material that expands to a volume of 8 times) and a plate-shaped wall material of a predetermined length composed of a metal plate attached to the inside (for example,
Sumitomo 3M Co., Ltd. product name: FS-195RR sheet etc.) 31 is used, and the width of this wall material 31 is both side walls of the box-shaped body 20.
It is the same as the internal law of 28. A substantially L-shaped metal corner member 32 is attached to both sides of the wall member 31, and the corner member 32 can be installed so as to straddle the upper portions of both side walls 28 of the box-shaped body 20. is there.

The top wall 30 also has a wall member 31 protruding at a portion 33 of the insertion tongue portion 23 of the box-shaped body 20.

The present embodiment thus constructed will be described according to the assembling process.

First, a plurality of box-shaped bodies 20 are arranged over a desired length, the insertion tongue portion 23 of the box-shaped body 20 is inserted into the fitting portion 24 at each joining portion, and then both ends of each box-shaped body 20. After back-to-back joining flanges 27 provided on the parts, these joining flanges 27, 27
Two plate members 271 and 271 that are taller than these are inserted between them. Then, the bolts and nuts 272 are fixed so that these are integrated. After that, the tip portions 271a and 271a of both plate members 271 and 271 are bent toward the respective bottom walls 25 as shown in FIGS. 2 and 3.

Due to the joining of the box-shaped bodies 20, at the joined portions of the box-shaped bodies 20, the corners 22 and the joining plates 40 and 41 made of metal are reinforced at the corners 22 at the bottom of each wall in the lengthwise direction. At the same time, since it is lined from the inside by the joining flange 27, problems such as curling when the joining portion expands and exposure to the outside do not occur. Therefore, there is no risk of fire entering from the joint. In addition, these joints are heat insulating materials.
The same reinforcing effect as that of the portion where 26 is provided is achieved.

After that, support rods are arranged outside the bottom wall 25 of each box-shaped body 20 at appropriate intervals (for example, 2 to 3 m), and are suspended by suspension bolts.

In this way, the communication cable 50 is placed on the heat insulating material 26 on the bottom wall 25 according to the conventional method with respect to the fire resistant duct 10 formed by connecting the fire resistant duct units A (see FIG. 2).

At this time, at the joint B of each fireproof duct unit A,
As shown in FIG. 3, the joining flanges 27, 27 provided on each
The two plate members 271 and 271 fixed to the bottom wall 25 are bent toward the bottom wall 25, and the respective tip portions 271a and 271a are located on the bottom wall 25 side. Therefore, the communication cable 50 is placed on the bottom wall 25. At the joint B, the joint flanges 27, 27 support the communication cable 50, and the communication cable 50 can be bent by the concave portion at the joint B. Absent.

Furthermore, it is desirable that the communication cable 50 be placed so as not to contact the wall surfaces 28 on both sides. Then, when the placing of the communication cable 50 is completed, the opening of the box-shaped body 20 is covered with the ceiling wall 30. At this time, the metal corner members 32 provided on both sides of the top wall 30 straddle the opening of the box-shaped body 20 so that the wall member 31 covers the opening surely. In addition, the top wall 30 is attached by inserting the insertion tongue portion 33 at the tip into the adjacent top wall as in the case of joining the box-shaped bodies 20.
There is no problem that the joint portion is turned up by being inserted into the fitting portion 34 of 30 and that it is exposed to the outside. Therefore, there is no risk of fire entering from the joint.

Since the refractory duct mounted in this manner is entirely surrounded by the heat insulating material, it is not affected by the abnormal heat in the structure, and there is no fear of causing a modulation in the communication cable.

Then, in the unlikely event that a fire occurs in a place where the box-shaped body is provided, the members forming the box-shaped body 20 and the ceiling wall 30 are formed of a foam ceramic material, When the temperature exceeds a predetermined temperature, the foam ceramic material expands at a predetermined rate. As a result, the foamed ceramics material bulges outward at the portions excluding the metallic corner members 22 and 32 to form a seamless heat insulating layer on the entire wire covering. As a result, the internal communication cable 60 can be used as long as the fire resistance of the heat insulating layer continues (normally 1 to 3 hours).
It will be shielded from the heat of the flame. Therefore, if the fire extinguishing work is performed promptly, there is no risk of damaging the communication cable 50. In addition, if it takes time to extinguish the fire, it is possible to take sufficient measures such as providing a bypass for the above-mentioned communication cable at a place away from the fire site, and prevent a communication error or disconnection due to the fire. Can be done.

FIG. 4 shows another example of the joining method of the box-shaped body 20. Instead of the method of providing the joining flange 27 as shown in FIG. 1, the insertion tongue portion 23 is inserted into the fitting portion 24, and the other. This is to prevent the joints from slipping in the department.

In this embodiment, the heat insulating material is provided in the recess formed in the joint B.
26 is placed, and like the joining flange 27 in the above embodiment, it is possible to protect the heat insulating material 26 in both the fireproof duct units A and place the communication cable 50 without any hindrance.

FIG. 5 shows another example of the joining method of the box-shaped body 20. A cover 273 having a U-shaped cross section is attached to one of the joining flanges 27 in FIG. The plate 274 having a substantially U shape is inserted between the two plates, and this plate 2
The cover 273 covers the 74.

According to this method, the work of bending the joining flange 27 is unnecessary, and the assembling work is further simplified.

In the embodiment shown in FIG. 3, the joining flanges 27, 27 are used.
Although the plate members 271 and 271 are inserted between them and the plate members 271 and 271 are bent, the joining flanges 27 and 27 may be made tall and bent. Alternatively, this joining method is used for each fireproof duct unit A
Any shape and structure may be adopted as long as a structure that does not allow a fire or the like to enter from the joint portion of is adopted.

[Effect of device]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the connected fireproof duct units are fixed to each other by bolts or the like after back-to-back joining flanges provided on both sides so as not to separate, and then both joining flanges are bent toward the bottom side. To be joined together. As a result, the refractory duct units are securely joined, and no gap is created at each joint, and
The mechanical strength of each joint can be improved. In addition, the gap between the heat insulating materials in each joint is prevented from forming a step due to the joint flange, and the joint flange is bent downward. Therefore, when mounting the communication cable, The communication cable can be placed smoothly without hindering the gap, and the corners of each heat insulating material are protected from contact with the communication cable when the communication cable is placed, and the communication cable is depressed in the gap. There is no risk of bending.

According to the second aspect, when the joining flanges are back-to-back, two plate members are inserted and bent to the bottom wall side, so that the bent portion fills the gap in the joint section, You can achieve the same effect as.

According to claim 3, the joint flanges are back-to-back, a plate having a U-shaped cross section is inserted between them, and then a cover having a U-shaped cross section is attached to the fixing portion for joining. As a result, the joining work becomes easier than the joining structure according to claim 11.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of an essential part showing an embodiment according to the present invention. FIG. 2 is a perspective view showing a state in which a communication cable is placed inside. FIG. 3 is an enlarged sectional view of the joint portion in the present invention. FIG. 4 is an enlarged sectional view showing another embodiment. FIG. 5 is an enlarged sectional view showing still another embodiment. [Explanation of the symbols of the main parts] A …… Fire-resistant duct unit B …… Joined portion 10 …… Fire-resistant duct 20 …… Plural box-shaped bodies with a substantially U-shape 21,31 …… Wall material 22,32… … Metal corner member 23 …… Insertion tongue 24 …… Insertion part 25 …… Bottom wall of box 20 27 …… Flange 28… Both sides of box 20… Top wall 50… … Communication cable 271 …… Plate material 271a …… Tip part of plate material 271 272 …… Bolts and nuts 273 …… C-shaped cross section cover 274 …… Plate.

Claims (3)

[Scope of utility model registration request] 1. A refractory duct unit formed by connecting four plate-like wall materials for forming both side walls, a bottom portion and a ceiling portion in a box-shaped cross section by providing a heat insulating material inside, In a fireproof duct in which a communication cable or the like is arranged through a heat insulating material and which is arranged in a structure through a supporting tool, a substantially L-shape having substantially the same length as both side walls and the bottom wall material is formed. Two metal corner members are attached to each wall member, one end portion of the wall member forms an insertion tongue projecting from one end portion of the metal corner member, and the other end portion of the metal corner member is formed. A fitting portion for fitting the insertion tongue portion is formed closer to the one end portion side than the other end portion, and a heat insulating material is not provided at the bottom portion of the insertion tongue portion and the fitting portion, and
A plurality of refractory duct units provided with connecting flanges at the parts where this heat insulating material is not provided are fitted with the insertion tongue provided at one end of each to the mating fitting part, and the connecting flanges are back-to-back. A connection structure for a fire-resistant duct, characterized in that after connecting together with bolts and the like, the connection flanges are connected by bending the tips of the connection flanges to the bottom side. 2. When the connecting flanges are back-to-back, 2
2. The connection structure for a fireproof duct according to claim 1, wherein a single plate material is inserted, the connecting flange is fixed together with the plate material with bolts, and both plate materials are bent toward the bottom side. 3. A refractory duct unit formed by connecting four plate-like wall members for forming both side walls, a bottom portion and a ceiling portion in a box-shaped cross section by providing a heat insulating material inside, In a fireproof duct in which a communication cable or the like is arranged through a heat insulating material and which is arranged in a structure through a supporting tool, a substantially L-shape having substantially the same length as both side walls and the bottom wall material is formed. Two metal corner members are attached to each wall member, one end portion of the wall member forms an insertion tongue projecting from one end portion of the metal corner member, and the other end portion of the metal corner member is formed. A fitting portion for fitting the insertion tongue portion is formed closer to the one end portion side than the other end portion, and a heat insulating material is not provided at the bottom portion of the insertion tongue portion and the fitting portion, and
A plurality of refractory duct units provided with connecting flanges at the parts where this heat insulating material is not provided are fitted with the insertion tongue provided at one end of each to the mating fitting part, and the connecting flanges are back-to-back. In addition, after inserting a plate having a U-shaped cross section between them, a cover having a U-shaped cross section is attached to the fixing portion to connect the plates, and the connection structure of the fire resistant duct is characterized.