JP7475868B2 - Fire prevention system - Google Patents

Description

The present invention relates to a system that is installed in areas where buildings are densely packed together to prevent the spread of fire by releasing fire-retardant liquid into the buildings.

In old residential areas and traditional wooden housing areas in urban areas, there are areas where wooden buildings are built close together and the spacing between adjacent buildings is narrow (hereinafter referred to as "densely wooden areas"). In densely wooden areas, fires can easily overflow the narrow spacing between buildings, and damage can easily increase as the fire spreads. In addition, densely wooden areas are not only difficult for fire engines to enter, but also make it difficult to spray water on closely spaced walls, as the space in front of the wall is narrow and it is not possible to ensure a sufficient distance from the water outlet to the wall. As a result, water must be sprayed along the wall of the building at narrow intervals, making it difficult to extinguish the fire or prevent the fire from spreading. As such, it is difficult for fire engines to efficiently spray water on fires in densely wooden areas.

JP 2004-344246 A JP 2019-063199 A

Patent Document 1 describes a device that improves the fire resistance of structural members by forming a water film on the surface of the structural member in the event of a fire. In this device, water is supplied to the upper part of the surface of a wooden structural member, and while wetting the surface, the water flows freely down to form a water film that covers the surface. However, it is difficult to form a uniform water film on the surface, and fire spreads from areas where the water film is thin or where the water film has not been formed. In particular, when the exterior wall is clapboard-like, as described below, a water film cannot be formed on the bottom end of the board, making it easy for the fire to spread. Patent Document 2 also describes a fire spread prevention system that installs a drencher head in a densely wooded area and sprays water. However, this mainly sprays water on the roof, and does not spray water on the exterior wall surface.

The objective of the present invention is to provide a fire prevention system that can efficiently prevent the spread of fire in areas where buildings are densely packed together.

(1) The present invention is a fire spread prevention system characterized in that a discharge head is provided under the eaves between adjacent buildings, and the discharge head discharges fire-retardant liquid diagonally upward toward the exterior wall surface of the buildings.
The present invention has the effect of discharging fire-retardant liquid obliquely upward from a discharge head installed under the eaves close to the exterior wall surface of a building, which makes it easy for the fire-retardant liquid to reach and adhere to the exterior wall surface. In addition, because the discharge head is installed under the eaves, it has the effect of suppressing deterioration of the discharge head from the inside due to rainwater entering through the discharge head.

(2) The present invention also relates to a fire spread prevention system as described in (1), characterized in that the fire-retardant liquid has a higher viscosity than water and the exterior wall surface is clapboard-covered.
In the present invention, the fire-retardant liquid has high viscosity and therefore easily adheres to exterior wall surfaces, etc. Also, clapboard exterior wall surfaces used in traditional wooden houses, etc., have boards that protrude diagonally downward, making it easy for fire to spread. According to the present invention, the fire-retardant liquid easily adheres to the bottom of the protruding boards, so high fire-retardant capabilities can be achieved.

(3) The present invention also relates to a fire spread prevention system as described in (1) or (2), characterized in that the discharge head discharges the fire-retardant liquid in a fan shape at an angle of 120° to 160°, and the fire-retardant liquid reaches the exterior wall surface in a range of 1.5 to 2.5 widths per vertical width.
According to the present invention, the fire-retardant liquid is discharged in a fan-like shape diagonally upward, so that the exterior wall surface can be uniformly covered with the fire-retardant liquid. Furthermore, since the fan-like shape has an angle of 120° to 160°, the liquid is not discharged directly to the side, which would not reach the exterior wall, so that the fire-retardant liquid can be used effectively.

(4) The present invention also relates to a fire spread prevention system as described in any of (1) to (3), characterized in that an adjustment means is provided for rotating the discharge head vertically, making it possible to adjust the vertical discharge direction of the fire-retardant liquid.
According to the present invention, the discharge head can be adjusted at the installation site to a direction that allows the fire-retardant liquid to be discharged most efficiently relative to the exterior wall surface.

(5) The present invention also relates to a fire spread prevention system as described in any of (1) to (4), characterized in that the piping for supplying the fire-retardant liquid to the discharge head has horizontal piping and vertical piping, and the system is equipped with a plurality of the discharge heads arranged at different heights.
According to the present invention, the fire-retardant liquid can be efficiently supplied between narrow spaces between buildings by using horizontal piping, and by providing multiple discharge heads at different heights using vertical piping, the fire-retardant liquid can be sprayed over the entire exterior wall surface that extends vertically, including two- and three-story buildings.

(6) The present invention also relates to a fire spread prevention system as described in any of (1) to (5), which has a protruding pipe with the discharge head provided near its tip, and the protruding pipe protrudes from near the exterior wall surface so that the discharge head is located away from the exterior wall surface.
According to the present invention, fire-retardant liquid can be discharged from a discharge head located at a position separated from the outer wall surface through a protruding pipe from a pipe installed on the outer wall surface.

According to the present invention, the fire retardant liquid can be reliably applied to the exterior wall surface.

A fire prevention system installed between closely packed buildings 1. A fire spread prevention system installed on the exterior wall surface 11a of a building 1, viewed from diagonally above. A fire spread prevention system installed on an exterior wall surface 11a of a building 1, as viewed from above a horizontal cross section of the exterior wall surface 11a. FIG. A fire spread prevention system installed on the exterior wall surface 11a of a building 1, viewed from the side of the exterior wall surface 11a. A fire spread prevention system installed on an exterior wall surface 11a of a building 1, as viewed from outside the exterior wall surface 11a.

Figure 1 shows a fire spread prevention system installed between closely packed buildings 1. In Figure 1, two buildings 1 are wooden houses, built with their exterior walls 11 facing each other at a narrow interval. Eaves 13 extend from the roof 12, and a discharge head 2 is located under the eaves 13 between the buildings 1. In this embodiment, the distance α between the exterior wall surfaces 11a of the two buildings 1 is 100 cm. In areas where buildings 1 are densely packed, such as densely wooded areas, the distance α is narrow at 50 to 150 cm, and once a fire breaks out, it is easy for the fire to spread to other buildings 1. In the drawings of this application, the floor area of the building 1 is shown smaller than it actually is. The facing exterior walls 11 of the two buildings 1 are made of clapboard, which will be described later. The fire spread prevention system is formed by pipes 3, etc., and the discharge heads 2 are installed in two levels, one above the other.

The piping 3 is formed by a wall piping 31 attached to the exterior wall 11 along the exterior wall surface 11a, and a protruding piping 32 protruding from near the exterior wall surface 11a toward the exterior wall 11 of the adjacent building 1, and supplies fire-retardant liquid to the discharge head 2. The wall piping 31 includes a horizontal piping 311 and a vertical piping 312. The end of the horizontal piping 311 is connected to the fire-retardant liquid injection device 4. It is installed horizontally along the slab 14 of the building 1, turns the corner of the building 1, and extends to the lower part between the buildings 1.

In FIG. 1, the dotted lines indicate the vertical discharge direction of the fire-retardant liquid. The fire-retardant liquid is discharged between the two dotted lines extending from the discharge head 2. In this embodiment, the discharge heads 2 are arranged in two tiers, one above the other, and the fire-retardant liquid is discharged to cover the exterior wall surface 11a. The fire-retardant liquid also reaches below the eaves 13, preventing the fire from spreading from the eaves 13. In this embodiment, the fire-retardant liquid is a highly viscous substance with thixotropic properties, and becomes fluid due to the shear stress generated when it is pushed out into the piping 3. When it reaches the exterior wall surface 11a, etc. and the shear stress is eliminated, it returns to its high viscosity. Therefore, it adheres to the exterior wall surface 11a, etc., and has high fire-retardant properties.

Figure 2 shows a fire prevention system installed on the exterior wall surface 11a between buildings 1, as seen from diagonally above. The area enclosed by the dotted circle β shows a cross section of the exterior wall 11. The exterior wall 11 is made up of multiple wooden exterior wall panels 11b that extend laterally and are partially overlapped, with the upper part of each exterior wall panel 11b being hidden by the lower part of the exterior wall panel 11b above, forming a clapboard structure. Clapboard structure is an exterior wall structure that is often used in old wooden buildings and traditional buildings.

The pipe 3 branches off from a horizontal pipe 311 installed in the slab 14, and a vertical pipe 312 extends upward along the exterior wall surface 11a. Two protruding pipes 32 are connected to the vertical pipe 312 at different heights. The protruding pipes 32 extend in a direction approximately perpendicular to the exterior wall surface 11a. A discharge head 2 is provided near the tip of the protruding pipe 32, and the protruding pipes 32 install the discharge head 2 at two locations at different heights, spaced apart from the exterior wall surface 11a.

Figure 3 shows a fire prevention system installed on the exterior wall surface 11a of a building 1, viewed from above the horizontal cross section of the exterior wall surface 11a. The upper protruding pipe 32 and other parts shown in Figures 1 and 2 are shown. A vertical pipe 312 is connected upward from the horizontal pipe 311. In Figure 3, the vertical pipe 312 is in the shadow of the first joint 35. As shown in Figure 2, the protruding pipe 32 is connected to the vertical pipe 312 at two points, at the top and bottom, by joints such as elbows and tees and short pipes. As shown in Figure 3, the pipe 3 from the vertical pipe 312 is first directed to the side parallel to the exterior wall surface 11a by the first joint 35 and then connected to the first short pipe 33. Furthermore, the protruding pipe 32 extending approximately perpendicular to the exterior wall surface 11a in a direction away from the exterior wall surface 11a is connected by the second joint 36. The third joint 37 connects to the second short pipe 34 in a horizontal direction parallel to the outer wall surface 11a, and the fourth joint 38 connects to the outer wall surface 11a, and the discharge head 2 is attached to the second short pipe 34 after facing the outer wall surface 11a. The connection part of the pipe 3 is joined by an external thread and an internal thread provided on the pipe and an elbow. In this embodiment, the discharge head 2 is provided near the tip of the protruding pipe 32 with the head tip 25 of the discharge head 2 facing the outer wall surface 11a. In this embodiment, the distance from the outer wall surface 11a to the discharge groove 23 is 35 cm. In view of the area of the adhesion area and the adhesion state of the fire-retardant liquid on the outer wall surface 11a discharged from one discharge head 2, it is preferable that the distance from the outer wall surface 11a to the discharge groove 23 is 15 to 50 cm. However, the discharge head 2 is provided below the eaves 13 and not provided outside the tip of the eaves 13. Therefore, rainwater is less likely to enter the discharge groove 23, which is the discharge port, and deterioration of the discharge head 2, etc. is suppressed.

The third joint 37, the second short pipe 34, and the fourth joint 38 are screwed in place, and the vertical release direction of the discharge head 2 can be adjusted by tightening the screws. The third joint 37, the second short pipe 34, and the fourth joint 38 serve as adjustment means for rotating the head tip 25 of the discharge head 2 in the vertical direction, which is the up-down direction relative to the second short pipe 34. When the head tip 25 of the discharge head 2 is pressed downward, the upward-facing discharge groove 23 faces toward the outer wall surface 11a, and the vertical release direction moves downward of the outer wall surface 11a while facing diagonally upward.

Figure 4 is a cross-sectional view of the discharge head 2. Figure 4 (A) is a horizontal cross-sectional view of the discharge head 2, and (B) is a vertical cross-sectional view. (B) shows the b-b cross section in Figure 4 (A), and (A) shows the a-a cross section seen from the head tip 25 side in (B). In Figure 4 (B), the right side is the inlet 22 for the fire-retardant liquid, and an external thread 24 is cut on the outside. A central axial hole 21 is provided along the axis c-c of the discharge head 2 shown by the dotted line, connecting the inlet 22 to the discharge groove 23, which is the discharge port. From the discharge groove 23 on the left side, the fire-retardant liquid is discharged in a fan-like shape in the direction seen from the extension of the axis c-c (or in the direction of Figure 4 (A)). The discharge groove 23 is a cut made perpendicular to the axis c-c from the periphery of the discharge head 2, and the angle of the fan-like shape at which the fire-retardant liquid is discharged changes depending on the depth of the cut of the discharge groove 23. If the release groove 23 is shallow, the fan-shaped angle will be narrow, and if the release groove 23 is deep, the fan-shaped angle will be wide.

Figure 5 shows a fire spread prevention system installed on the exterior wall surface 11a of the building 1, as seen from the side of the exterior wall surface 11a. The protruding pipe 32 protrudes from the vicinity of the exterior wall surface 11a. In this embodiment, the protruding pipe 32 protrudes approximately vertically to the exterior wall surface 11a from the vertical pipe 312 provided along the exterior wall surface 11a. The protruding pipe 32 is provided approximately horizontally with respect to the ground. Here, the length of the protruding pipe 32 is selected to be shorter than the interval α between adjacent buildings 1, shorter than the length of the eaves 13 of the building 1, and such a length that the discharge head 2 can be placed at a position where a sufficient thickness of fire-retardant liquid having a fire spread effect can be applied to the entire exterior wall 11 of the building 1. Then, the discharge head 2 is attached to the exterior wall surface 11a with the head tip 25 facing the exterior wall surface 11a as shown in Figure 5 by the third joint 37, the second short pipe 34, and the fourth joint 38 shown in Figure 3. The head tip 25 located on the left side of the discharge head 2 in Figures 4(B) and 5 is slightly lowered as shown in Figure 5, and the discharge head 2 is inclined with respect to the protruding pipe 32. Therefore, the fire-retardant liquid is discharged from the discharge groove 23 toward the outer wall surface 11a from an oblique downward direction as shown by the dotted line and arrow in the vertical discharge direction 5. When viewed from the direction of the inlet 22 of the discharge head 2, the fire-retardant liquid is discharged in a fan shape, but it is not a thin curtain shape. As shown by the dotted line in Figure 5, the fire-retardant liquid spreads in the vertical direction at a predetermined angle, and is discharged so that the vertical discharge direction 5 becomes thicker toward the tip of the fan, so that a wide area in the vertical direction of the outer wall surface 11a can be covered with the fire-retardant liquid. In this embodiment, the angle of the vertical discharge direction 5 is in the range of about 50 to 85 degrees from the horizontal direction. The inner angle of the range is about 35 degrees, but the shape of the discharge groove 23 is set so that the inner angle of the range is 20 to 70 degrees. In this embodiment, the head tip 25 is lowered, so even if rainwater, dust, etc. enters the inside of the discharge head 2, it remains near the head tip 25 and is unlikely to penetrate into the pipe 3.

The exterior wall 11 is constructed by partially stacking multiple wooden exterior wall panels 11b extending laterally, and is clapboard-type, with the upper part of each exterior wall panel 11b overlapping and hidden by the lower part of the upper exterior wall panel 11b. With clapboard-type construction, rainwater flowing downward does not reach the upper end of the exterior wall panel 11b, making it difficult for rainwater to enter the interior of the exterior wall 11. However, the lower end of the protruding exterior wall panel 11b is prone to burn, and the structure makes it easy for a fire to spread from the adjacent building 1. Moreover, it is difficult to cover the lower end of the exterior wall panel 11b with the flowing fire-retardant liquid. In the present invention, the fire-retardant liquid reaches the exterior wall surface 11a from diagonally below, so the lower end of the exterior wall panel 11b in the clapboard-type construction is also covered with the fire-retardant liquid. To explain in more detail, water can be sprayed so that the fire-retardant liquid adheres sufficiently to the overlapping parts of the exterior wall panels 11b, and even if there are gaps in the overlapping parts of the exterior wall panels 11b, the fire-retardant liquid will enter the gaps and prevent the spread of fire from the adjacent building 1. Furthermore, because the fire-retardant liquid has thixotropy, it is difficult for it to flow down the exterior wall surface 11a, and it is possible to cover the exterior wall panels 11b to a thickness greater than or equal to a specified thickness.

In addition, because the fire-retardant liquid is forcefully discharged from the discharge head 2, some of it turns into a mist and floats around, adhering to the exterior wall surface 11a, etc. As a result, the fire-retardant liquid also adheres to the lower part of the eaves 13, which is off-center from the vertical discharge direction 5, preventing the spread of fire. Furthermore, because the discharge head 2 is installed under the eaves, which is closer to the exterior wall 11 than the tip of the eaves 13, the fire-retardant liquid is more likely to adhere to the lower part of the eaves 13. In addition, because the discharge groove 23 faces upward, rainwater can easily enter from above, but because the discharge groove 23 of the discharge head 2 is located under the eaves 13, there is an advantage that rainwater is less likely to enter the inside of the discharge head 2.

Figure 6 shows a fire spread prevention system installed on the exterior wall surface 11a of a building 1, viewed from the outside of the exterior wall surface 11a. The dotted line indicates the fan-shaped discharge range 6 of the fire-retardant liquid, and the inside of the thick dotted line indicates the adhesion area 7 of the fire-retardant liquid on the exterior wall surface 11a. The fire-retardant liquid is discharged in a fan shape from the discharge head 2 inside the discharge range 6 shown by the dotted line. The inner angle of the discharge range 6 as viewed from the axis c-c direction in Figure 4 (B) is shown as the discharge angle 61. The discharge angle 61 in Figure 6 is approximately 140°. If the discharge angle 61 is close to 180°, the fire-retardant liquid on both sides is discharged laterally from the discharge head 2 and does not reach the exterior wall surface 11a. This results in waste of the fire-retardant liquid. On the other hand, if the discharge angle 61 is too narrow, the exterior wall surface 11a that can be covered with fire-retardant liquid by one discharge head 2 will be narrow. It is preferable that the discharge angle 61 is a water discharge pattern of 120 to 160°, and more preferably 130 to 150°. It is also preferable for the fire-retardant liquid to be sprayed onto the exterior wall surface 11a in a water discharge pattern that results in a coverage area 7 that is 1.5 to 2.5 widths wide relative to the vertical width 1. In FIG. 6, the coverage area 7 created by the upper discharge head 2 and the lower discharge head 2 partially overlap. Also, although it is hidden by the tip of the eaves 13, the coverage area 7 created by the upper discharge head 2 reaches up to the top of the exterior wall surface 11a and also adheres to the underside of the eaves 13.

When a fire breaks out, fire-retardant liquid is pumped out from the fire-retardant liquid injection device 4 shown in FIG. 1. Then, the fire-retardant liquid is supplied to the discharge head 2 through the pipe 3, and the discharge groove 23, which is the discharge port, discharges the fire-retardant liquid in a fan-like shape diagonally upward toward the exterior wall surface 11a. The fire-retardant liquid reaches the exterior wall surface 11a in a range of 1.5 to 2.5 widths relative to the vertical width 1, and adheres to the adhesion area 7 in FIG. 6. In this embodiment, the exterior wall 11 is clapboard-covered, but a sufficient thickness is also adhered to the lower end portion of the exterior wall panel 11b. Furthermore, the sprayed fire-retardant liquid reaches the lower part of the eaves 13 and adheres to the entire area under the eaves. In this way, by covering the exterior wall surface 11a of the building 1 with fire-retardant liquid, it is possible to prevent the spread of fire from adjacent buildings 1 and to extinguish the exterior wall 11.

In FIG. 6, the lower part of the exterior wall surface 11a is not the adhesion area 7, but some of the applied fire-retardant liquid flows down and adheres thereto. Furthermore, even if the lower part of the exterior wall 11 is not covered with fire-retardant liquid, fire spread due to heat or flames from a neighboring house is unlikely to occur from low parts of the building, and sufficient fire protection is achieved. If the position of the lower discharge head 2 is lowered below the slab 14, the lower part of the exterior wall surface 11a can also be made into the adhesion area 7. The slab 14 is generally made of concrete, and fire will not spread even if it is exposed to heat without the fire-retardant liquid attached to it.

<Modification>
In this embodiment, the discharge groove 23 of the discharge head 2 is perpendicular to the axis c-c as shown in FIG. 4B, but the discharge groove 23 may be provided tilted from the axis c-c toward the head tip 25. In FIG. 4B, the cut is tilted so that the upper part of the discharge groove 23 is on the left side rather than the lower part. In this way, the fan-shaped fire-retardant liquid is discharged obliquely from the discharge head 2, so there is no need to lower the tip of the discharge head 2. When the tip of the discharge head 2 is lowered as shown in FIG. 5, the protruding pipe 32 is located to the side of the discharge groove 23, so that part of the fire-retardant liquid discharged in a fan shape may abut against the protruding pipe 32. However, if the tip of the discharge head 2 is not lowered or the amount of lowering is reduced, part of the discharged fire-retardant liquid is less likely to abut against the protruding pipe 32.

In this embodiment, a fire-retardant liquid injection device 4 is provided in each building 1, but the fire-retardant liquid injection device 4 may be mobile and connected to a fire-retardant liquid injection port provided in each building 1. By doing so, it becomes unnecessary to provide a fire-retardant liquid injection device 4 in each unit.

In this embodiment, there is one vertical pipe 312, but multiple vertical pipes 312 are installed depending on the width of the exterior wall 11. In this embodiment, the discharge heads 2 are arranged in two levels, one above the other, but they can also be arranged in three or more levels. In particular, an arrangement of three or more levels is necessary for a building 1 with a high exterior wall surface 11a, such as a two-story building. Furthermore, if the heights of the upper and lower levels are different, the horizontal pipes 311 can be provided at multiple heights and the fire protection liquid injection devices 4 can be connected separately to mitigate the pressure drop due to height.

In this embodiment, two joints are used between the vertical pipe 312 and the protruding pipe 32, but a single joint may be used to hold the protruding pipe 32 directly from the vertical pipe 312 in the vertical direction of the exterior wall surface 11a. In this embodiment, which uses two joints, the tip position of the protruding pipe 32 can be adjusted up and down. In other words, it is possible to release fire-retardant liquid diagonally upward from the discharge head 2 toward the exterior wall surface 11a of the building 1 by rotating only the protruding pipe 32 downward without rotating the discharge head 2.

The discharge head 2 may be attached in any manner so long as the discharge outlet can be held away from the exterior wall surface 11a without going beyond the eaves. It is desirable to provide an adjustment means for adjusting the direction of the discharge outlet. It is particularly preferable that the direction of the discharge outlet can be adjusted in the vertical discharge direction 5. In FIG. 3, if the attachment direction of the fourth joint 38 to the second short pipe 34 is reversed and the discharge head 2 is attached so that the head tip 25 faces away from the exterior wall surface 11a, the possibility of the discharged fire-retardant liquid hitting the protruding pipe 32, etc. may be reduced. Alternatively, the discharge head 2 may be attached directly to the protruding pipe 32 to adjust the angle of the protruding pipe 32 with respect to the exterior wall surface 11a, and the vertical discharge direction 5 may be adjusted using the second joint 36, etc. as an adjustment means.

In this embodiment, the protruding pipe 32 extends approximately perpendicular to the outer wall surface 11a, but it does not have to be perpendicular as long as the discharge head 2 can be maintained at a position away from the outer wall surface 11a. However, by extending the protruding pipe 32 approximately perpendicular to the outer wall surface 11a as in the embodiment, the discharge head 2 can be held at a position away with the short protruding pipe 32. Furthermore, the first short pipe 33 etc. can be made rotatable, and the protruding pipe 32 can be raised to a position along the outer wall surface 11a during normal times. In this case, the protruding pipe 32 rotates in reaction to the discharge of the fire-retardant liquid from the discharge port of the discharge head 2, and moves to a position protruding from the outer wall surface 11a as in the embodiment and stops there. In this modified example, the protruding pipe 32 does not protrude from the outer wall surface 11a during normal times, so it does not get in the way and maintains an aesthetic appearance. In addition, the discharge head 2 is normally provided under the eaves, so rainwater, etc. does not enter. The discharge head 2 during discharge may protrude from under the eaves.

Furthermore, when the space between adjacent buildings 1 is very narrow, the protruding piping 32 may not be provided or may be made very short, and the fire-retardant liquid may be discharged diagonally upward toward the outer wall surface 11a of the building 1 facing the attached building 1.
In the embodiment, a substance having thixotropy is used as the fire-retardant liquid, but other highly viscous substances may be used. In addition, water or a non-highly viscous agent may also provide a certain level of fire-retardant effect. In addition, although the embodiment has been described as a fire spread prevention system, the system may be used as a fire extinguishing device or a fire extinguishing system whose main purpose is to extinguish a fire.

1 Building, 11 Exterior wall, 11a Exterior wall surface, 11b Exterior wall panel, 12 Roof, 13 Eaves, 14 Slab foundation, 2 Discharge head, 21 Central axial hole, 22 Inlet, 23 Discharge groove, 24 External thread, 25 Head tip, 3 Pipe, 31 Wall pipe, 311 Horizontal pipe, 312 Vertical pipe, 32 Protruding pipe, 33 First short pipe, 34 Second short pipe, 35 First joint, 36 Second joint, 37 Third joint, 38 Fourth joint, 4 Fire protection liquid injection device, 5 Vertical discharge direction, 6 Discharge range, 61 Discharge angle, 7 Adhesion area

Claims (6)

The discharge head is installed under the eaves between adjacent buildings.
The discharge head is a fire spread prevention system that discharges fire retardant liquid obliquely upward toward the exterior wall surface of the building,
The system includes a horizontal pipe extending to the lower part of the building and constituting a wall surface pipe, a vertical pipe connected to the horizontal pipe, and a protruding pipe having the discharge head provided near the tip thereof,
The protruding pipe is provided so as to protrude from the vicinity of the outer wall surface so that the discharge head is located at a position separated from the outer wall surface,
A fire spread prevention system characterized in that the discharge head discharges the fire-retardant liquid in a fan shape toward the exterior wall surface and the eaves from a height below the middle of the building . In addition to the discharge head provided on the upper stage, a discharge head is also provided on the lower stage at a position separated from the outer wall surface,
The lower stage discharge head discharges the fire-retardant liquid toward the outer wall surface,
2. The fire spread prevention system according to claim 1, wherein the length of the protruding pipe is shorter than the distance between adjacent buildings and shorter than the length of the eaves. The discharge head is installed under the eaves between adjacent buildings.
The fire-retardant liquid is discharged from the discharge head obliquely upward toward the exterior wall surface of the building,
the discharge head is plumbed through a right angle bend fitting;
A fire spread prevention system characterized in that the vertical release direction of the fire-retardant liquid can be adjusted by the tightness of the screws of the joint. The fire spread prevention system described in claim 3, characterized in that the discharge head has a discharge groove formed by a cut made perpendicular to the axis from the periphery, and the tip is directed toward the outer wall surface and is installed so that the tip is downward. A protruding pipe having the discharge head provided near the tip thereof,
The protruding pipe protrudes from the vicinity of the outer wall surface so that the discharge head is located at a position separated from the outer wall surface,
5. A fire prevention system according to claim 3 or 4, characterized in that the direction of the discharge head is adjustable by the joint adjacent to the discharge head. The fire-retardant liquid has a higher viscosity than water,
A fire spread prevention system as described in any one of claims 1 to 5, characterized in that the exterior wall surface is clapboard-covered, and water can be sprayed so that the fire-retardant liquid adheres sufficiently to the areas where the exterior wall panels overlap .

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