JP3062885B1 - Cable spread prevention structure in cable laying tunnel - Google Patents

Abstract

[Problem] To prevent the spread of a cable in a cable laying tunnel easily regardless of whether it is new or existing. SOLUTION: A non-combustible or flame-retardant sheet 11 is arranged in a cable-laying cave 1 so as to extend in the longitudinal direction of the cave so as to partition at least two cable groups 6. Or,
The non-combustible or flame-retardant sheet 21 is arranged at right angles to the longitudinal direction of the sinus so as to partition the space along the cable at intervals in the longitudinal direction of the sinus. The non-combustible or flame-retardant sheet 11 extending in the longitudinal direction of the cave prevents the fire from spreading to other cable groups. The non-combustible or flame-retardant sheet 21 arranged at right angles to the longitudinal direction of the sinus prevents the spread of fire in the longitudinal direction of the sinus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the spread of fire of a laid cable when a fire occurs in which a protective coating or an insulating coating of the laid cable burns in a tunnel where cables such as power transmission and distribution cables are laid. The present invention relates to a structure for preventing a cable from spreading in a cable laying tunnel for preventing fire.

[0002]

2. Description of the Related Art In general, when a cable ignites in a cable laying tunnel, a synergistic effect occurs in that organic and insulating materials and protective materials constituting the cable supply fuel and heat to each other during combustion. The cable spreads easily.
As a measure to prevent such cable spread,
The following technologies are known. Spray paint to prevent fire spread on bundled cables or cables arranged on a rack. In this case, the paint is applied in a thick mortar shape. A fire spread prevention mat is wrapped around a bundle of cables or a group of cables arranged on a rack. Wrap a tape to prevent fire spread for each cable. Make the cable itself flame-retardant. That is, a flame-retardant material is used for the insulating coating or the protective coating.

[0003]

All of the above-mentioned conventional measures for preventing the spread of the cable have a problem that the work for preventing the spread of the fire takes a long time. In addition, when the above-described countermeasure using the paint for preventing fire spread is applied to a bundle of cables, in order to lay additional cables, the paint that has been applied thickly is peeled off, and the cables including the additional cables are bundled. After that, the work of applying the paint again is necessary, but there is a disadvantage that the work of peeling off and re-applying the paint is not easy and requires a long time. Further, even when the present invention is applied to a cable group arranged on a rack, for example, in a place where a wall penetrates, it is necessary to peel off the paint, and similarly, the work is not easy and a long time is required. Also,
Even when using the above-described fire spread prevention mat or the fire spread prevention tape, it is necessary to peel off the mat or the tape and wind it again, and the work is similarly not easy and requires a long time. It costs. In addition, there is a problem that the measure for making the cable itself flame-retardant cannot be applied to the existing cable laying tunnel.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is easy to perform a work for preventing a cable from spreading in a cable laying tunnel and has excellent workability. An object of the present invention is to provide a cable fire prevention structure.

[0005]

Means for Solving the Problems The invention of claim 1 for solving the aforementioned problems is a cable fire prevention structure for preventing the spread of the laying cable in a cable laying sinus tract was laying a plurality of the cable group, metal Foil and flame retardant rubber or
A composite sheet with a plastic sheet with a thickness of 0.4
A 5 mm non-combustible or flame-retardant sheet is extended in the longitudinal direction so as to vertically hang from the installation portion of the cave ceiling to the vicinity of the floor so as to partition at least two cable groups divided in the width direction of the cave. It is characterized by.

[0006] According to a second aspect of the invention, a cable fire prevention structure for preventing the spread of the laying cable in a cable laying sinus tract that laying cables each cable mounting body provided in multiple stages, the metal foil and flame Flammable rubber or rubber
0.45 thick composite sheet with plastic sheet
mm incombustible or flame-retardant sheet, vertically hanging from the ceiling of the cave or the mounting portion on the back of the cable placement body so as to partition the space above each of the cable placement bodies at intervals in the longitudinal direction of the cave. It is characterized by being arranged at right angles to the longitudinal direction of the sinus in this state.

A third aspect of the present invention is the non-combustible type according to the first aspect.
Split the flame-retardant sheet in the longitudinal direction of the sinus and join it
And the joining part is one side
The magnet attached to the other and the iron piece attached to the other
It is characterized by being adsorbed and connected.

[0008]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS. 1 to 3 show an embodiment of a cable spread prevention structure according to claim 1. 1 is a cross-sectional view of the cable laying tunnel 1, FIG. 2 is a cross-sectional view of FIG.
FIG. 3 is a perspective view of a main part inside the cable laying tunnel 1 of FIG. Cable installation cave (illustrated as a cave) 1 in the illustrated example
Is a rectangular cross section, the left and right sides in the longitudinal direction of the cave 1 are cable installation spaces 2, and the central portion is a passage space 3. In the left and right cable laying spaces 2, for example, a plurality of cable mounts 4 each of which is a shelf-like rack extending in the longitudinal direction of the cave 1 are installed in a plurality of stages at intervals in the vertical direction. The cables 5 are arranged side by side as one cable group 6. Each cable mounting body 4
Posts 8 standing on the inner wall and spaced apart in the longitudinal direction of the sinus
Attached to. Although not shown, the cable mounting body 4 is preferably fixed to each of the columns 8 so as to protrude toward the center of the cave, and mounted on the bracket. In addition, instead of providing the shelf-shaped rack 4 as the cable mounting body 4, a bracket-shaped mounting body protruding toward the center of the sinus is simply provided at intervals in the longitudinal direction of the sinus, and the bracket-shaped rack 4 is provided. The cable may be laid directly on the mounting body.

The non-combustible or flame-retardant sheet 11 for preventing the spread of the cable is made of a metal foil and a flame-retardant rubber, as will be described later.
Or a composite sheet with a plastic sheet,
Is 0.45 mm, and is extended in the longitudinal direction of the cave so as to hang vertically from the mounting portion of the cave ceiling to the vicinity of the floor so as to separate the left and right cable laying space 2 from the passage space 3 at the center. I do. In the illustrated example, the non-combustible or flame-retardant sheet 11 is fixed to a mounting bracket 12 provided on the ceiling with bolts or the like and hangs vertically. Further, the non-combustible or flame-retardant sheet 11 is divided in the longitudinal direction of the sinus as shown in FIG.
It is good to join. If you attach a magnet to one of the joints and an iron piece to the other,
They can be connected only by adsorbing each other, and the connection is easy.

The material of the noncombustible or flame retardant sheet 11 is gold.
Metal foils include iron, steel, copper, copper alloy, aluminum, aluminum alloy
Other metals can be used, such as flame retardant rubber or plastic.
Non-halogen flame-retardant rubber or plastic
Use backing sheet (polyolefin elastomer, etc.)
it can. Metal foil and non-halogen flame retardant rubber or plastic
FIG. 9 shows an example of a combination with a lock sheet . 9 is a black non-halogen flame-retardant rubber sheet 11a having a thickness of 0.3 mm, a stainless steel foil 11b having a thickness of 0.1 mm, and a black non-halogen flame-retardant plastic film having a thickness of 0.05 mm. 11c and a total thickness of 0.45 mm. However, in the present invention
This numerical value of 0.45 mm in this
It includes the range of common sense tolerances in the sheet.
You.

When a fire occurs in one of the left and right cable installation spaces 2 in the cable installation passageway 1, the non-combustible or flame-retardant sheet 11 prevents at least the temperature from moving to the opposite cable installation space 2. This prevents the cable 5 in the cable installation space 2 on the opposite side from spreading to the fire.

The non-combustible or flame-retardant sheet 11 may be arranged only on one side of the left and right cable installation spaces 2. Even in this case, it is possible to prevent the fire from spreading to the cable installation space on the opposite side. When three or more cable laying spaces are provided in the width direction of the tunnel (when two rows of passage spaces are provided)
In this case, two or three or more rows of non-combustible or flame-retardant sheets 11 can be arranged correspondingly.

FIG . 4 shows the non-combustible or flame-retardant sheet 11 described above.
(A) is an explanation of another embodiment in which
Cross-sectional view of the tunnel to be constructed.
Cave showing the state where non-combustible or flame-retardant sheet 11 is installed
FIG. In this embodiment, as shown in the drawing, a non-combustible or flame-retardant sheet 11 ' in a horizontal state is extended in the longitudinal direction of the sinus , and the same flame-retardant or flame-retardant sheet is used as described above.
The flexible sheet 11 from the installation part of the cave ceiling to the vicinity of the floor.
It is arranged to extend in the longitudinal direction in a state of hanging down.

FIGS. 5 to 7 show an embodiment of a cable spread prevention structure according to a second aspect of the present invention. The cable laying tunnel 1 itself is the same as described above. The non-combustible or flame-retardant sheet 21 for preventing the spread of the cable is provided with the respective cables provided in multiple stages.
Attachment to the ceiling of the cave or the back of the cable placement body so as to partition the space above the placement body 4 at intervals in the longitudinal direction of the cave.
It is arranged perpendicular to the longitudinal direction of the sinus in a state of hanging vertically from the part . In the embodiment, the non-combustible or flame-retardant sheet 21 is disposed in each space between the cable mounting bodies 4 provided in a plurality of stages. The non-combustible or flame-retardant sheet 21 is
It is fixed to a mounting bracket 22 attached to the lower surface (or ceiling) of each cable mounting body 4 with bolts or the like, and hangs vertically.

By the way, according to a fire experiment and a Steiner tunnel test simulating a cave, it can be seen that how to prevent the temperature movement in the longitudinal direction of the cave is effective in preventing the spread of fire. According to the cable spread prevention structure of FIGS. 5 to 7, when a fire occurs in the cave 1, the non-combustible or flame-retardant sheet 21 directly blocks the temperature movement in the cave longitudinal direction. It is extremely effective in preventing the spread of fire. In this embodiment, since the cable placing body 4 formed of a shelf-like rack partitions the cable laying space up and down, the cable placing body 4 also functions to prevent the spread of fire in the vertical direction .

In the cable spread prevention structure shown in FIGS. 1 to 4, the non-combustible or flame-retardant sheet 11 does not directly prevent the temperature from moving in the longitudinal direction of the sinus. Reducing the cross-sectional area of the fire occurrence space at 11 has a certain effect in suppressing the temperature movement in the longitudinal direction of the sinus, so that the effect of preventing the spread of fire in the longitudinal direction of the sinus can also be obtained.

FIG. 8 shows a vertical section from the attachment of the cave ceiling to the vicinity of the floor.
Non-combustible or flame-retardant sheet 11 ( Claim 1 ) extended in the longitudinal direction of the sinus in a state of being directly suspended , and each cable mounting body
And a non-combustible or flame-retardant sheet 21 ( Claim 2 ) which is arranged at right angles to the longitudinal direction of the sinus so as to partition the space above at a distance in the longitudinal direction of the sinus. According to this, the prevention of cable spread is further ensured.

The sinus passage in each of the above embodiments has a rectangular cross section, but the cross section itself may have a circular cross section or any other shape.
In addition, the present invention is applicable not only to a cable laying path for power transmission and distribution but also to a cable laying path in which an optical cable is laid. Furthermore, a cave is not necessarily limited to an underground tunnel. It is sufficient that the tunnel has a tunnel-like cable laying space provided in the building.

[0019]

According to the present invention, since the non-combustible or flame-retardant sheet blocks temperature movement in the width direction of the sinus or temperature movement in the longitudinal direction of the sinus, it is possible to prevent the cable from spreading. it can. The work to prevent the spread of fire can be performed by simply extending the non-combustible or flame-retardant sheet in the longitudinal direction of the sinus or at a right angle to the longitudinal direction of the sinus. This method is extremely easy and excellent in workability as compared with methods for preventing fire spread, such as winding a fire prevention mat or winding a fire prevention tape. Also, when laying additional cables, complicated and difficult operations such as peeling off paints, mats and tapes necessary for conventional methods, re-applying paints, re-wrapping mats and tapes, etc. are unnecessary, and existing It can be easily applied to cable laying tunnels.

[Brief description of the drawings]

[1] shows one embodiment of a cable fire prevention structure in a cable laying sinus tract of the invention of claim 1 is a cross-sectional view of the cable installation sinus tract.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of a main part inside the cable laying tunnel of FIG. 1;

FIG. 4 illustrates another embodiment of the invention of claim 1 .
In, (b) the transverse cross-sectional view of the sinus tract construction target, (b) is
Construction of the cable spread prevention structure of claim 1 in the tunnel of (a)
FIG. 6 is a cross-sectional view of a sinus tract showing a state where the stomach is cut.

[5] shows an embodiment of the invention of claim 2 is a cross-sectional view of the cable installation sinus tract.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a perspective view of a main part of the inside of the cable passageway of FIG. 5;

FIG. 8 is a perspective view showing a main part of an embodiment in which both the first and second aspects of the present invention are implemented, and is a main part inside a cable passageway.

FIG. 9 is a cross-sectional view showing an example of a non-combustible or flame-retardant sheet used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable laying path 2 Cable laying space 3 Passage space 4 Cable mounting body 5 Cable 6 Cable group 12,22 Mounting bracket 11,21 Non-combustible or flame-retardant sheet

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsuji Takahara 1800 Kishioka-cho, Suzuka City, Mie Prefecture Inside Fujikura Suzuka Plant (56) References 開 62-33629 (JP, U) 開 63- 198332 (JP, U) Fully open 1979-3395 (JP, U) Fully open 1986-123626 (JP, U) Fully open 1986-129424 (JP, U) Fully open 1986-169432 (JP, U) JP-B-56-3728 (JP, B2) JP-B-57-43014 (JP, B2) JP-B-55-43736 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 9/00-9/12

Claims (3)

(57) [Claims] 1. A cable spread prevention structure for preventing a spread of a laid cable in a cable laying tunnel in which a plurality of cable groups are laid, comprising a composite of a metal foil and a flame-retardant rubber or plastic sheet.
A state in which a non-combustible or flame-retardant sheet having a thickness of 0.45 mm, which is a sheet, vertically hangs from a mounting portion of a cave ceiling to near a floor so as to partition at least two cable groups divided in the width direction of the cave. A cable spread prevention structure in a cable laying tunnel, wherein the structure is extended in the longitudinal direction. 2. A cable spread prevention structure for preventing a spread of a laid cable in a cable laying tunnel in which a cable is laid on a cable mounting body provided in multiple stages, comprising a metal foil and a flame-retardant rubber or plastic. Composite with sheet
The ceiling of the cave or the back of the cable carrier so as to separate the non-combustible or flame-retardant sheet having a thickness of 0.45 mm from the space above each cable carrier at intervals in the longitudinal direction of the cave. A cable spreading prevention structure in a cable laid cave, wherein the structure is arranged perpendicularly to a longitudinal direction of the cave in a state of hanging vertically from a mounting portion of the cable. 3. A non-combustible or flame-retardant sheet is formed by dividing and joining in a longitudinal direction of a sinus, and the joining portion attracts a magnet attached to one side and an iron piece attached to the other side to each other. The structure for preventing a cable from spreading in a cable laying tunnel according to claim 1, wherein the cable is connected.