JP7786117B2 - Fire extinguishing equipment and installation methods for fire extinguishing equipment - Google Patents

Description

The present invention relates to fire extinguishing equipment used for fire prevention measures for cable facilities and a method for installing fire extinguishing equipment.

Fire extinguishing tubes are known that are installed in cable trays in which cables, including cables or electric wires, are laid, and that spray a fire extinguishing agent at the point where the cables catch fire (see, for example, Patent Document 1). The fire extinguishing tube described in Patent Document 1 is configured so that a fire extinguishing agent is sealed in a tubular container, and when a fire breaks out, the container melts, spraying the fire extinguishing agent from the melted point. This fire extinguishing tube is installed in a serpentine manner relative to the direction in which the cable tray is laid.

Special Publication No. 2000-510737

Cable trays may be positioned at an angle that includes a vertical tilt, depending on the condition of the installation location, such as a wall surface. If a fire were to break out in an inclined cable tray, the flames would tend to spread upward in the direction in which the cables are laid. According to the technology described in Patent Document 1, if a cable tray is inclined, there is a risk that extinguishing agent will remain in the fire extinguishing tube located below the cable tray in the event of a fire, resulting in insufficient fire extinguishing.

The present invention aims to provide a fire extinguishing device and a method for installing fire extinguishing equipment that can provide fire prevention measures for inclined cable trays.

One aspect of the present invention is a fire extinguishing system comprising: a fire extinguishing tube in which a pressurized fire extinguishing agent is sealed in a tubular container, and the outer shell of the container melts when heated to release the fire extinguishing agent; and a cable tray in which cables are laid and in which a plurality of the fire extinguishing tubes are installed along the laying direction of the cables, wherein the plurality of fire extinguishing tubes are arranged such that the arrangement density of the fire extinguishing tubes arranged at the top increases as the inclination angle, which is the angle between the laying direction and the horizontal direction , increases, the inclination angle being greater than or equal to 0 degrees and less than 90 degrees, and the plurality of fire extinguishing tubes are arranged such that the arrangement width from the top to the bottom of the plurality of fire extinguishing tubes decreases as the inclination angle increases, and the arrangement density within the arrangement width increases .

The present invention makes it possible to implement fire prevention measures for inclined cable trays. According to the present invention, by increasing the installation density of multiple fire extinguishing tubes in the area above the cable tray as the inclination angle of the cable tray increases, it is possible to improve fire extinguishing performance against flames that spread upward.

In addition, the multiple fire extinguishing tubes in this embodiment may be arranged so that as the inclination angle increases, the arrangement width from the top to the bottom of the multiple fire extinguishing tubes decreases and the arrangement density within the arrangement width increases.

This invention makes it possible to achieve an arrangement of fire extinguishing tubes with increasing density as they move upward.

Furthermore, the plurality of fire extinguishing tubes of the present invention may be arranged so that the arrangement density increases upward within the specified length.

This invention makes it possible to achieve an arrangement of fire extinguishing tubes with increasing density as they move upward.

Furthermore, the fire extinguishing tube of the present invention is arranged so that its axis intersects with the laying direction.

According to the present invention, even if the cable tray is installed at an inclination angle, fire prevention measures can be taken to prevent the extinguishing agent in the fire extinguishing tube from remaining in the fire in the event of a fire.

Furthermore, each of the fire extinguishing tubes of the present invention may be arranged in a direction that spans both sides of the cable tray along the laying direction.

According to the present invention, by arranging multiple fire extinguishing tubes parallel to the width direction of the cable tray, a fire prevention measure can be taken that prevents the extinguishing agent in the fire extinguishing tubes from remaining in the tube in the event of a fire.

Furthermore, in the present invention, when the inclination angle is 90 degrees, the array width may be less than half of the predetermined length.

According to the present invention, when a cable tray is placed on a vertical surface such as a wall, fires that spread upward can be reliably extinguished.

The present invention may also include a heat-resistant sheet covering the cables and the plurality of fire extinguishing tubes in the cable tray.

According to the present invention, by covering cables, fire extinguishing tubes, and cable trays with fire-resistant sheets, the storage space formed within the fire-resistant sheets can be filled with fire extinguishing agent in the event of a fire, improving fire extinguishing performance.

One aspect of the present invention is a method for installing fire extinguishing equipment in a cable tray in which cables are laid, the method including: setting an inclination angle, which is the angle between the laying direction of the cables and the horizontal; and setting an arrangement of multiple fire extinguishing tubes within an arrangement width from the top to the lowest part of the multiple fire extinguishing tubes so that the arrangement density of the fire extinguishing tubes arranged upward increases as the inclination angle increases, wherein the inclination angle is greater than or equal to 0 degrees and less than or equal to 90 degrees .

The present invention allows for advance design of fire protection measures for inclined cable trays. According to the present invention, by increasing the installation density of multiple fire extinguishing tubes in the area above the cable tray as the inclination angle of the cable tray increases, it is possible to create a design that improves fire extinguishing performance against flames that spread upward.

The present invention may also include a step of installing multiple fire extinguishing tubes in the cable tray based on the arrangement.

The present invention allows multiple fire extinguishing tubes to be installed on an inclined cable tray in an arrangement that takes fire prevention measures into account.

The present invention may also include a step of covering the cable tray on which the plurality of fire extinguishing tubes are installed with a heat-resistant sheet.

This invention improves the fire extinguishing performance of cable trays in the event of a fire.

This invention makes it possible to implement fire prevention measures for inclined cable trays.

FIG. 2 is a front view showing a schematic configuration of the fire extinguishing equipment. FIG. 10 is a side view showing the configuration of a fire extinguishing system having cable trays with different inclination angles. 1 is a flowchart showing each step of a method for installing a fire extinguishing system. FIG. 10 is a front view schematically showing the configuration of a fire extinguishing system according to a modified example. FIG. 10 is a front view schematically showing the configuration of a fire extinguishing system according to a modified example. FIG. 10 is a front view schematically showing the configuration of a fire extinguishing system according to a modified example. FIG. 10 is a front view schematically showing the configuration of a fire extinguishing system according to a modified example.

The following describes a fire extinguishing device and a method for installing fire extinguishing equipment according to an embodiment of the present invention, with reference to the drawings.

As shown in Figure 1, fire extinguishing equipment 1 comprises a cable tray C installed on an installation target and multiple fire extinguishing tubes F arranged on the cable tray C. The cable tray C is a support structure for installing cables K, such as multiple power lines and multiple communication lines, in power facilities such as nuclear power plants. In addition to being installed on horizontal installation targets such as floors and ceilings, cable trays C may also be installed on installation targets at an inclined angle relative to the horizontal, such as on walls, inclined surfaces, or installed aerial. Below, the cable tray C is shown in a state where it is inclined in the installation direction of the cables K. Figure 1 shows an example of a cable tray C with an inclination angle of 90 degrees.

The cable tray C is formed, for example, from a plate-shaped metal material. The cable tray C has, for example, a pair of side plates C1, C2 arranged opposite each other. The side plates C1, C2 are formed in the shape of rectangular strips. The longitudinal direction of the side plates C1, C2 is arranged upright so that it follows the laying direction of the cables K (z-axis direction). The lateral direction of the side plates C1, C2 is arranged so that it follows the horizontal direction (y-axis direction).

One side (+y side) of the pair of side plates C1, C2 in the short direction is connected to the other side (-y direction) of multiple cross beams C3. The cross beams C3 are formed in a rectangular plate shape. The longitudinal direction of the cross beams C3 is arranged along a direction perpendicular to the longitudinal direction of the side plates C1, C2 (x-axis direction). The short direction of the cross beams C3 is arranged along the laying direction of the cables K (z-axis direction). As a result, the other surface of the multiple cross beams C3 in the cable tray C forms the laying surface for the cables K, and the cables K are laid on it. Multiple fire extinguishing tubes F are installed on the other side (-y side) of the cables K, along the laying direction of the cables K.

The number of fire extinguishing tubes F to be installed is set, for example, for each predetermined length L of the cable tray C. Because the cable tray C can be several kilometers long, the fire extinguishing equipment 1 is divided and managed into units based on the predetermined length L. The predetermined length L is set, for example, from several meters to several tens of meters. In the cable tray C, the amount of fire extinguishing agent required is predetermined for each protected volume that includes the area to be extinguished. The number of fire extinguishing tubes F to be installed is determined, for example, based on the amount of fire extinguishing agent specified for each protected volume. Therefore, the number of fire extinguishing tubes F to be installed is set based on the amount of fire extinguishing agent for the protected volume corresponding to the predetermined length L.

The multiple fire extinguishing tubes F are arranged so that there are more of them in the upper half of the cable tray C than in the lower half. The multiple fire extinguishing tubes F are arranged based on an arrangement method described below. Each fire extinguishing tube F, for example, comprises a tubular container F1. The fire extinguishing tube F is filled with pressurized fire extinguishing agent, and when heated, the outer shell of the container melts, releasing the fire extinguishing agent. The container F1 has a storage space for storing the fire extinguishing agent. The container F1 is made of, for example, a resin material.

A lid F2 is provided at each end of the container F1 to close the opening. A pressurized fire extinguishing agent is sealed in the storage space within the container F1. When the outside of the container F1 is heated, the outer shell melts, and the fire extinguishing agent is released from the melted area due to the internal pressure of the storage space. The fire extinguishing tubes F are, for example, straight. Each fire extinguishing tube F is, for example, arranged in a direction that spans a pair of side plates C1, C2 on both sides of the cable tray C in the laying direction. The overall length of the fire extinguishing tube F is adjusted so that it can be spanned in the width direction of the cable tray C and protrudes beyond the overall width of the cable tray C so that a heat-resistant sheet T, described below, can be wrapped around it.

Each fire extinguishing tube F is positioned so that its axis intersects the installation direction, and preferably so that its axis is horizontal. By positioning the axis of the fire extinguishing tube F horizontally, it is possible to prevent extinguishing agent from remaining in the container F1 when a fire is extinguished.

Adjacent fire extinguishing tubes F are arranged parallel to each other and at equal intervals. The fire extinguishing tubes F are fixed to the cable tray C using, for example, a fixing member (not shown) that is fastened to the cable tray C by screws. The fixing member is made of a material with high thermal conductivity, such as metal, to facilitate the transfer of heat from a fire to the fire extinguishing tubes F when the heat is transferred to the cable tray C.

The cable tray C and multiple fire extinguishing tubes F are covered with a heat-resistant sheet T. The heat-resistant sheet T is made of a flame-retardant film material. The cable tray C is wrapped with the heat-resistant sheet T to form a storage space S for cables K. In the event of a fire breaking out within the storage space S and the flames propagate upward within the storage space S, the temperature in the upper part of the storage space S is more likely to rise than in the lower part. In this case, the containers F1 of the multiple fire extinguishing tubes F arranged at the top of the storage space S melt, filling the storage space S with fire extinguishing agent and extinguishing the flames within the storage space S. The heat-resistant sheet T is not necessary if the cable tray C is installed in a narrow space such as a pipeline, or if the fire extinguishing agent is guaranteed to flow downward.

Next, we will explain how to arrange the fire extinguishing tubes in the fire extinguishing equipment 1.

As shown in Figure 2, the fire extinguishing system 1 may be installed with the cable tray C at an inclination angle θ greater than 0 degrees. The speed at which a flame spreads upward within the storage space S of the cable tray C increases as the inclination angle θ increases. Based on the above phenomenon, the multiple fire extinguishing tubes F in the fire extinguishing system 1 are positioned closer to the upper side of the cable tray C in accordance with the increase in the inclination angle θ.

Specifically, the multiple fire extinguishing tubes F are arranged so that as the inclination angle θ in the laying direction of the cable tray C of a predetermined length L increases, the arrangement width H from the top CT of the cable tray C of the predetermined length L to the bottommost FB of the multiple fire extinguishing tubes F decreases compared to the predetermined length L, and the arrangement density within the arrangement width H increases. The multiple fire extinguishing tubes F are arranged, for example, at equal intervals within the arrangement width H.

When the inclination angle θ of the cable tray C is close to 0 degrees , the speed at which the flame spreads upward on the cable tray C is low, and the arrangement width H of the multiple fire extinguishing tubes F is set to a value close to the predetermined length L of the cable tray C. As the inclination angle θ of the cable tray C increases, the distance between the lowest part FB of the multiple fire extinguishing tubes F and the lower part CB at the predetermined length L of the cable tray C increases, and the arrangement width H is set to decrease.

When the inclination angle is 90 degrees, for example, the array width H is set to less than half the predetermined length L of the cable tray C. The array width H can be set to any value, and may be set according to the speed at which a flame spreads upward, which varies depending on the type, quantity, diameter, and other conditions of the cables K. The array width H may also be set appropriately based on calculated values obtained through simulations or experimental data.

Next, we will explain the installation method for the fire extinguishing equipment 1. This installation method for the fire extinguishing equipment can be applied not only to newly installed cable trays C, but also when installing fire extinguishing tubes on existing cable trays C.

Figure 3 shows each step of the installation method for fire extinguishing equipment 1. In the installation method for fire extinguishing equipment 1, an operator sets a predetermined length L of the cable tray C along the laying direction of the cables K (step S100). The predetermined length L is set for each unit used to manage the cable tray C. An ID is assigned to each cable tray C for each classification of the predetermined length L, and the IDs are stored in a database. The operator sets the number of fire extinguishing tubes F to be installed on the cable tray C according to the predetermined length L (step S102).

To prevent increases in installation costs, the worker determines the optimal number of fire extinguishing tubes F that can ensure fire extinguishing performance within the specified length L of the cable tray C, based on specified conditions such as the type, material, diameter, burning rate, and amount of fire extinguishing agent contained in the fire extinguishing tubes F of the cables K contained within the specified length L of the cable tray C.

The worker sets the inclination angle θ in the laying direction of the cable tray C (step S104). The worker sets the inclination angle θ in the laying direction of the cable tray C based on the installation conditions of the cable tray C of a specified length L that is the object of management. The worker identifies the installation target for the cable tray C, such as a wall surface, inclined surface, or ceiling surface. The worker sets the inclination angle θ in the laying direction of the cable tray C based on the type of direct fixing method or indirect fixing method such as hanging when installing the cable tray C on the installation target.

The worker sets the arrangement width H, from the top CT of the cable tray C to the bottom FB of the multiple fire extinguishing tubes F over a predetermined length L, to be smaller than the predetermined length L in accordance with the tilt angle θ (Step S106). The worker sets the arrangement width H based on the estimated speed at which a flame will spread upward in accordance with the tilt angle θ of the cable tray C. The worker sets the arrangement width H to be narrower in accordance with the increase in the tilt angle θ. The worker sets the arrangement of the multiple fire extinguishing tubes F within the arrangement width H (Step S108). The worker increases the density of the multiple fire extinguishing tubes F within the arrangement width H and sets an arrangement that moves the multiple fire extinguishing tubes toward the top of the cable tray C. Based on the set arrangement of the multiple fire extinguishing tubes F, the worker installs the multiple fire extinguishing tubes F on the cable tray C along the laying direction of the cables K (Step S110). The worker covers the cable tray C on which the multiple fire extinguishing tubes F are arranged with a heat-resistant sheet T (Step S112).

As described above, the fire extinguishing system 1 can provide fire prevention measures for inclined cable trays. By arranging multiple fire extinguishing tubes at a higher installation density on the upper side of an inclined cable tray, the fire extinguishing system 1 can activate multiple fire extinguishing tubes when a fire spreads upward, improving fire prevention. The fire extinguishing system 1 can set the arrangement of multiple fire extinguishing tubes F according to the inclination angle θ of the cable tray C, thereby setting the arrangement of multiple fire extinguishing tubes F according to the speed at which a fire spreads upward.

[Modification]
The arrangement of the plurality of fire extinguishing tubes F of the fire extinguishing system 1 may be changed as appropriate. Hereinafter, the same components as those in the above embodiment will be designated by the same names and reference numerals, and duplicated descriptions will be omitted as appropriate.

When using general-purpose fire extinguishing tubes F, they may be formed longer than the width of the cable tray C. In this case, each fire extinguishing tube F may be bent so that its axis snakes along the installation direction of the cable tray C. For example, when multiple fire extinguishing tubes F are arranged at a high density within the arrangement width H, they may be arranged not only in parallel but also in other arrangements.

As shown in Figure 4, each fire extinguishing tube F may have one bent portion and be arranged in a U-shape relative to the installation direction of the cable tray C. In this case, each fire extinguishing tube F melts from below as the fire spreads upward, so no extinguishing agent remains within the fire extinguishing tube F. With this fire extinguishing system 1, even if the overall length of each fire extinguishing tube F is longer than the width of the cable tray C, the axis of the fire extinguishing tube F is arranged parallel to the horizontal direction within the arrangement width H, reducing the amount of extinguishing agent remaining in the event of a fire.

As shown in Figure 5, each fire extinguishing tube F may have, for example, multiple bends and be arranged in a serpentine pattern relative to the installation direction of the cable tray C. With this fire extinguishing system 1, even if the overall length of each fire extinguishing tube F is longer than the width of the cable tray C, the axis can be arranged parallel to the horizontal direction within the arrangement width H. With this fire extinguishing system 1, fire prevention measures can be taken to prevent the extinguishing agent in the fire extinguishing tube F from remaining in the event of a fire, even if the cable tray C is tilted.

As shown in Figure 6, the cable tray C may be inclined at an angle θ in the laying direction when installed with its width direction aligned with the wall surface. In this case, each fire extinguishing tube F may be arranged parallel to the horizontal. In this case, each fire extinguishing tube F may be provided with one or more bent portions as shown in Figures 4 and 5. With this fire extinguishing system 1, even if the cable tray C is inclined at an angle θ in the laying direction when its width direction is aligned with the wall surface, fire prevention measures can be taken to prevent the extinguishing agent in the fire extinguishing tube F from remaining in the cable tray C in the event of a fire.

As shown in Figure 7, the fire extinguishing tubes F may be arranged so that their installation density increases upward. For example, the fire extinguishing tubes are arranged so that the second distance L2 between each adjacent fire extinguishing tube above is shorter than the first distance L1 between each adjacent fire extinguishing tube below. With this fire extinguishing equipment, in the event of a fire where temperatures rise upward, multiple fire extinguishing tubes can be activated when the flames spread upward, improving fire prevention.

While several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments may be embodied in a variety of other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and their variations are within the scope of the invention and its equivalents as defined in the claims, as well as the scope and spirit of the invention.

1 Fire extinguishing equipment C Cable tray CB Bottom CT Top F Fire extinguishing tube F1 Container FB Bottom H Arrangement width K Cables L Specified length T Heat resistant sheet θ Inclination angle

Claims (8)

a fire extinguishing tube in which a pressurized fire extinguishing agent is sealed in a tubular container, and an outer shell of the container melts when heated to release the fire extinguishing agent;
a cable tray in which cables are laid and in which a plurality of the fire extinguishing tubes are installed along the laying direction of the cables;
As the inclination angle, which is the angle between the laying direction and the horizontal direction, increases, the plurality of fire extinguishing tubes are arranged so that the arrangement density of the fire extinguishing tubes arranged at the top increases;
The tilt angle is equal to or greater than 0 degrees and equal to or less than 90 degrees,
The plurality of fire extinguishing tubes are arranged such that as the inclination angle increases, the arrangement width from the top to the bottom of the plurality of fire extinguishing tubes decreases and the arrangement density within the arrangement width increases . The arrangement density of the plurality of fire extinguishing tubes increases upward.
The fire extinguishing system according to claim 1 . The fire extinguishing tube is arranged with its axis parallel to the horizontal direction.
The fire extinguishing system according to claim 1 or 2 . Each of the fire extinguishing tubes is arranged in a direction of extending on both sides of the cable tray along the laying direction.
The fire extinguishing system according to any one of claims 1 to 3 . A heat-resistant sheet is provided in the cable tray to cover the cables and the plurality of fire extinguishing tubes.
The fire extinguishing system according to any one of claims 1 to 4 . A method for installing fire extinguishing equipment, in which a fire extinguishing tube is installed in a cable tray in which cables are laid, the fire extinguishing tube containing a pressurized fire extinguishing agent sealed in a tubular container, and the tube is heated to melt the outer shell of the container and release the fire extinguishing agent,
setting an inclination angle, which is the angle formed between the laying direction of the cables and the horizontal direction;
A step of arranging the plurality of fire extinguishing tubes within an arrangement width from the top to the bottom of the plurality of fire extinguishing tubes so that the arrangement density of the fire extinguishing tubes arranged at the top increases as the inclination angle increases;
Equipped with
The method for installing fire extinguishing equipment, wherein the inclination angle is greater than or equal to 0 degrees and less than or equal to 90 degrees. installing a plurality of the fire extinguishing tubes in the cable tray based on the arrangement;
A method for installing the fire extinguishing system according to claim 6 . and covering the cable tray on which the plurality of fire extinguishing tubes are installed with a heat-resistant sheet.
A method for installing a fire extinguishing system according to claim 6 or 7 .