JP4986823B2 - Fire spread prevention device and drain piping structure - Google Patents

Description

  The present invention relates to a drainage pipe structure that collects drainage generated at each floor in an apartment house or an office building and sends it to the lower floor, and a fire spread prevention device used in the drainage pipe structure.

For example, in middle- and high-rise houses, drainage pipes that pass through floor slabs such as fire prevention sections on upper and lower floors are provided. Domestic wastewater generated at each floor is collected from the horizontal branch pipes into the drainage collecting pipes at each floor. The drainage collected at each floor is sequentially sent to the lower floor by a vertical pipe connected to the drainage collecting pipe, and sent to the sewer pipe through the bend pipe and the drainage horizontal main pipe.
By the way, the drainage pipe provided through the fire prevention section separating the upper and lower floors of the middle-high-rise housing is required to prevent the fire generated on the lower floor from spreading to the upper floor through the drainage pipe. Therefore, conventionally, the drainage collecting pipes installed through the floor slabs, the vertical pipes connecting the drainage collecting pipes provided on the upper and lower floor slabs, and some of the side branch pipes are all made of non-combustible material. What was built was used.

In general, a drain pipe made of metal such as a cast iron pipe or a steel pipe is used as a vertical pipe and a side branch pipe made of a non-combustible material. In recent years, a fire-resistant double-layer tube in which an inner tube made of a hard vinyl chloride resin is covered with an outer tube of mortar containing fibers is often used because of its light weight (Patent Document 1).
JP 2005-282330 A

  A pipe made of a metal material and a fireproof double-layer pipe are suitable for use as a side branch pipe in a high-rise house or the like because they are nonflammable. However, a pipe made of a metal material has a problem that since it is heavy, the degree of freedom of transportation is low, and processing operations such as dimensional alignment at a construction site are not easy. In addition, the refractory double-layer pipe must be cut separately for the inner pipe and outer pipe in the cutting work for size adjustment, and the work becomes complicated, and dust is generated from the mortar of the outer pipe at the time of cutting. There's a problem.

  Compared to tubes made of these noncombustible materials, tubes made of a flammable resin such as a hard vinyl chloride resin are superior in terms of workability such as cutting and cost. However, when a flammable resin pipe or a pipe containing a flammable resin is used as a side branch pipe, if a fire breaks out on the floor where it is constructed and the side branch pipe burns, flame and smoke are transferred to the drainage collection pipe. Enter and reach the upper floor through the vertical pipe. Thus, when the pipe | tube containing a combustible material is used for a side branch pipe, there exists a problem that a fire and smoke cannot be stopped in the fire prevention division which separates an upper and lower floor.

Similarly, from the viewpoint of fire resistance, the horizontal main pipe on the lowest floor of the building may be a pipe made of a metal material, but the horizontal main pipe with a large diameter is heavy and more than the horizontal branch pipe. However, there are difficulties in workability. For this reason, it is conceivable to use a flammable resin pipe or a pipe containing a flammable resin in part as the horizontal main pipe, but there is a problem similar to that of the above-mentioned side branch pipe.
The present invention has been made in view of the above-mentioned problems, and in buildings such as medium- and high-rise houses, a flammable resin pipe or a pipe containing a flammable resin in part is used as a lateral branch pipe for drainage. It aims at providing the fire spread prevention apparatus and drain piping structure which can prevent the fire spreading to the upper floor of the fire which occurred on the lower floor.

In order to achieve the above object, the present invention takes the following technical means.
That is, the fire spread prevention device according to the present invention is a fire spread prevention device installed at a connection portion between a flammable pipe formed of a flammable material and extending in a substantially horizontal direction and a nonflammable pipe formed of a nonflammable material. , Both of which are formed of a non-combustible material and have a flat plate-shaped blocking portion having a portion capable of closing an opening connected to the flammable piping in the non-flammable piping by moving; A main body movably supported in a direction orthogonal to the axis of the combustible pipe, the main body includes a notch capable of accommodating an end of the combustible pipe, and the blocking portion is elastic in movement. It is configured to be guided by a biasing force of the member or a volume increase of the thermal expansion member and guided to a state where the notch is closed when moving in the orthogonal direction.

Another fire spread prevention device according to the present invention is a fire spread prevention device installed at a connection portion between a flammable pipe formed of a flammable material and extending in a substantially horizontal direction and a nonflammable pipe formed of a nonflammable material. , Both of which are made of a non-combustible material, and by turning, a blocking portion capable of closing the opening connected to the flammable piping in the non-flammable piping, and a body that rotatably supports the blocking portion And the blocking portion is a flat blocking plate, and the blocking plate is rotatably supported around the direction perpendicular to the plane portion of the blocking plate at the upper part of the main body, The main body is provided with a through hole that is closed by the downward rotation of the blocking plate.

  Another fire spread prevention device according to the present invention is a fire spread prevention device installed at a connection portion between a flammable pipe formed of a flammable material and extending in a substantially horizontal direction and a nonflammable pipe formed of a nonflammable material. Each of the nonflammable pipes is made of a nonflammable material and can be turned to block the opening connected to the flammable pipe. A main body rotatably supported by a moving shaft, and the blocking portion is a flat blocking plate, and is a surface opposite to the side closing the opening, and from the rotating shaft. A weight is provided at the remote end.

  Another fire spread prevention device according to the present invention is a fire spread prevention device installed at a connection portion between a flammable pipe formed of a flammable material and extending in a substantially horizontal direction and a nonflammable pipe formed of a nonflammable material. A non-flammable material, a non-flammable pipe, a non-flammable pipe that can close the opening connected to the flammable pipe, and a body that supports the non-flammable part so as to be movable or rotatable. The blocking portion is configured to be movable or rotatable from a state of being arranged outside the opening to a state in which the opening can be closed, and communicating with the noncombustible pipe. Are separated from each other by a wall member and arranged outside the flow path or the opening, and move or rotate when the wall member is burned out, burned out, softened or detached.

Preferably, when the nonflammable pipe is installed at a connection portion between the nonflammable pipe and a part of the blocking portion is locked or abutted on the outer periphery of the flammable pipe, and the flammable pipe is removed. It is configured to be able to close the flow path that moves or rotates to communicate with the non-combustible pipe.
Preferably, the main body is configured to be attachable to the drainage collecting pipe.
The movement or rotation of the blocking part is performed by the weight of the blocking part.

The movement or rotation of the blocking part may be performed by the biasing force of the elastic member.
The movement or rotation of the blocking part may be performed by increasing the volume of the thermal expansion member.
The nonflammable pipe formed of the nonflammable material is a drainage collecting pipe or a bend pipe.
In addition, the “connecting portion” in the above is, for example, in the case of a drainage collecting pipe and a side branch pipe, not only in the vicinity of the boundary between the two when the drainage collecting pipe and the side branch pipe are directly connected, It has a broad meaning including also between the drainage collecting pipe and the side branch pipe when the collecting pipe and the side branch pipe are connected via the connecting member.

  According to the present invention, even if a flammable resin pipe or a pipe containing a flammable resin is used as a horizontal branch pipe or a horizontal main pipe for drainage, a fire that has occurred on the lower floor is spread to the upper floor. A fire spread prevention device and a drain piping structure that can be prevented can be provided.

[Example 1]
FIG. 1 is a view showing an outline of a drainage pipe structure 1, FIG. 2 is a front view of a fire spread prevention device 3 attached to a drainage collecting pipe 2, and FIG. 3 is a cross-sectional view taken along line AA in FIG.
In the following description, the upper side in FIGS. 1 to 3 is referred to as the upper or upper side, the lower side is referred to as the lower or lower side, and the upper and lower sides are referred to as the upper and lower sides. Further, the horizontal direction in FIG. 3 is referred to as a horizontal direction or a horizontal direction.

1 to 3, the drainage pipe structure 1 includes a drainage collecting pipe 2, a side branch pipe 4, a vertical pipe 5, a fire spread prevention device 3, and the like as one unit. The drainage piping structure 1 installed in each floor slab 6 and 6 that divides each floor is connected sequentially from the lower floor to the upper floor, and is consistent from the upper floor to the lower floor of the middle and high-rise multi-layered building Formed drainage piping system.
The drainage collecting pipe 2 is for joining drainage flowing in from the side branch pipes 4 provided on each floor to drainage flowing down from the upper floor, and for flowing the joined drainage down to the vertical pipe 5 on the lower floor. The middle part of the drainage collecting pipe 2 in the axial direction is a huge part having an inner diameter larger than the inner diameter of the vertical pipe 5, and an upper vertical pipe connecting part which is a connection part with the vertical pipe 5 on the upper floor above the huge part. 10 is formed, and a lower vertical pipe connecting portion that is a connecting portion with the lower level vertical pipe 5 is formed below the enormous portion, and toilet water, miscellaneous drainage, etc. on the drainage collecting pipe installation floor are formed on the side of the enormous portion A horizontal branch pipe connection portion 9 that is a connection portion with the horizontal branch pipe 4 through which the gas flows is formed. On the inner surface of the enormous portion, in particular, the inner surface of the inclined portion that transitions from the largest enlarging portion portion that bulges to the lower connecting portion 12, a blade body or an inclined plate that imparts a turning force to the drainage flow may be provided.

  The drainage collecting pipe 2 is fixed in a through hole 7 that penetrates a floor slab 6 that is a fire prevention section that divides an upper floor and a lower floor of a building. The drainage collecting pipe 2 has an upper portion (that is, an upper vertical pipe connecting portion and a lateral branch pipe connecting portion) protruding above the upper surface of the floor slab 6, and a lower portion (that is, a huge inclined portion and a lower vertical pipe connecting portion). It protrudes below the lower surface of the floor slab 6. The drainage collecting pipe 2 has a side branch pipe connection part 9 for connecting the side branch pipe 4 and a side pipe connection part 10 for connecting the side pipe 5 at a portion protruding from the upper surface of the floor slab 6. A nonflammable filling material 8 such as mortar, cement, or rock wool is filled between the drainage collecting pipe 2 and the through hole 7 that accommodates the drainage collecting pipe 2.

The drainage collecting pipe 2 is fixed to the floor slab 6 by a non-combustible filling material filled in a gap between the through hole 7 and the drainage collecting pipe 2, or in addition to or instead of a metal fitting (not shown). . When it is fixed only by the metal fitting, the gap between the through hole 7 and the drainage collecting pipe 2 is closed with a nonflammable material having no fixing function.
The lateral branch pipe connecting portion 9 includes a receiving port 11 that protrudes laterally and opens circularly at the protruding end. The receiving port 11 communicates with the internal flow path of the drainage collecting pipe 2. A slightly thicker flange 12 is provided on the outer periphery of the protruding end of the lateral branch pipe connecting portion 9. The flange 12 has a support portion 13 that protrudes upward in the radial direction and has a flat end surface (upper surface). The lateral branch pipe connecting portion 9 is connected to the lateral branch pipe 4 inserted into the receiving port 11.

The vertical pipe connecting portion 10 includes a receiving port 14 that protrudes upward and opens in a circular shape at the protruding end. The receiving port 14 communicates with the internal flow path of the drainage collecting pipe 2. A vertical pipe 5 is inserted into the receiving port 14, and drainage from the drainage pipe structure 1 on the upper floor flows into the drainage collecting pipe 2 through the vertical pipe 5.
The structure relating to the connection between the horizontal branch pipe connection portion 9 and the horizontal branch pipe 4 and the connection between the vertical pipe connection portion 10 and the vertical pipe 5 is known.

The drainage collecting pipe 2 is manufactured by a cast material such as gray cast iron and spheroidal graphite cast iron, a metal material such as steel and stainless steel, or a fireproof double-layer pipe having a two-layer structure of a vinyl chloride pipe and a fiber mortar pipe.
The horizontal branch pipe 4 is provided on each floor with a slight slope with respect to the horizontal so as to have a drainage gradient, and is used to send wastewater generated in a toilet, a washroom, a bathroom, and the like to the drainage collecting pipe 2. For the side branch pipe 4, a pipe made of a flammable resin or a flammable material such as an inexpensive and light hard vinyl chloride resin is used. Further, as the horizontal branch pipe, a pipe partially containing a flammable resin, for example, a fire-resistant double-layer pipe or a fire-resistant double-layer resin pipe, or a heat-resistant resin pipe can be used. In the case of using a fireproof double-layer pipe, it is conceivable to use the combustible vinyl chloride pipe portion which is an interior pipe exposed at or near the connecting portion of the drainage collecting pipe with the side branch pipe connecting portion 9. In addition, the fireproof multi-layer resin pipe is a three-layer resin pipe having a combustible resin layer such as a vinyl chloride pipe in the inner and outer layers and an intermediate layer made of a resin layer having thermal expansion and fire resistance. The heat-resistant resin tube means a heat-resistant vinyl chloride resin tube that is more resistant to heat than a normal vinyl chloride tube and other heat-resistant resin tubes.

  The vertical pipe 5 is for connecting the drainage collecting pipe 2 fixed to the floor slab 6 of the upper floor Fu and the drainage collecting pipe 2 fixed to the floor slab 6 of the lower floor Fd. As the vertical pipe 5, a pipe having fire resistance such as a fire-resistant two-layer pipe having a two-layer structure of a metal such as cast iron or a vinyl chloride pipe and a fiber mortar pipe is used. In addition to the above materials, the vertical pipe 5 may be a flammable resin pipe such as a vinyl chloride pipe, a heat-resistant resin pipe, or the above-described fireproof multilayer resin pipe. Thus, when using a pipe containing a flammable resin for a vertical pipe, it is necessary to adopt a piping form devised to give fire resistance as a drainage pipe structure, but the description is omitted because it is not directly related to the present invention. To do.

The fire spread prevention device 3 includes a blocking plate 15 and a main body 16.
The blocking plate 15 is a rectangular flat plate having four sides having a length larger than the outer diameter of the horizontal branch pipe 4. The shielding plate 15 and the main body 16 are formed of a nonflammable material such as a metal that is not melted by a flame during a fire, for example, cast iron.
The main body 16 includes a blocking plate housing portion 17 and an attachment portion 18.

The shielding plate accommodating portion 17 is a cylindrical body having a rectangular cross section that is slightly larger than the horizontal cross section of the shielding plate 15 (lateral cross section in FIG. 3). The shielding plate accommodating portion 17 accommodates the shielding plate 15 therein so that it can move up and down without rattling by guiding four surfaces except the upper and lower surfaces of the shielding plate 15. The blocking plate accommodating portion 17 has a substantially square notch 19 on the lower side. The notch 19 has a depth larger than the outer diameter of the lateral branch pipe 4. Both lateral sides of the notch 19 are leg-like portions 20, 20 extending in the vertical direction.

  The blocking plate accommodating portion 17 also guides one of the lateral side surfaces 21 and 21 extending in the vertical direction of the blocking plate 15 and the two surfaces 22 and 22 that are orthogonal to these and spread in the vertical direction in the leg-shaped portions 20 and 20. Is possible. Locking portions 23 and 23 for restricting the downward movement of the blocking plate 15 are provided inside the lower portions of the leg portions 20 and 20, respectively. In the case where the floor surface is used as the locking surface, a mode in which the locking portion is not provided is also possible.

The mounting portion 18 is fixed above one of the outer surfaces of the shielding plate housing portion 17. The mounting portion 18 protrudes in the horizontal direction and has a flat bottom surface.
The fire spread prevention device 3 is incorporated into the drainage pipe structure 1 as follows.
First, the horizontal branch pipe 4 and the vertical pipe 5 are connected to the drainage collecting pipe 2 embedded in the through-hole 7 of the floor slab 6, and the basic part of the drainage pipe structure that collects drainage sequentially from the upper floor and flows down to the lower floor. Is constructed. Thereafter, the mounting portion 18 is overlaid on the support portion 13 of the flange 12 of the side branch pipe connecting portion 9 so that the side branch pipe 4 is accommodated in the notch 19. The attachment portion 18 is provided with a hole penetrating vertically, and the support portion 13 is provided with a female screw communicating with the hole. The attachment portion 18 is fixed to the support portion 13 by screws 24 and 24, and the main body 16 Is attached to the lateral branch pipe connecting portion 9. In the above example, the fire spread prevention device 3 is attached to the drainage collecting pipe 2. However, the present invention is not limited to this, and the fire spread prevention device 3 can be installed or attached to the floor slab 6 or the vertical pipe 5.

In a state where the main body 16 is attached to the lateral branch pipe connecting portion 9, the locking portions 23, 23 of the leg portions 20, 20 are positioned below the lateral branch pipe 4.
Finally, the shielding plate 15 is fitted into the shielding plate housing portion 17 from the upper end of the shielding plate housing portion 17. After that, the shielding plate 15 fitted in the shielding plate accommodating portion 17 is maintained in a state where the lower end surface 25 which is a part of the shielding plate 15 is locked or abutted on the outer peripheral upper surface of the lateral branch pipe 4. The In this way, the shielding plate 15 as the shielding portion is supported by the shielding plate housing portion 17 constituting the main body 16 so as to be movable downward. It should be noted that the blocking plate 15 may be locked or brought into contact with the outer peripheral surface of the horizontal branch pipe 4 indirectly by interposing a buffer material or the like between them.

FIG. 4 is a view showing the vicinity of the side branch pipe connecting portion 9 when the fire spread prevention device 3 operates.
4B is a cross-sectional view taken along the line BB in FIG.
In FIG. 1, when a fire occurs in the lower floor Fd and a flame reaches the place where the drainage pipe structure 1 is installed, the side branch pipe 4 formed of a flammable resin starts to burn. When the side branch pipe 4 burns and burns out, burns out or softens, the blocking plate 15 loses its support, and is guided by the inner surface of the blocking plate accommodating portion 17 and moves downward by its own weight. Then, the movement of the blocking plate 15 is stopped by the locking portions 23 and 23 at the lower ends of the leg portions 20 and 20. By this movement, the blocking plate 15 mechanically closes the opening portion (the inflow opening portion of the drainage from the side branch pipe) of the receiving port 11 of the side branch pipe connecting portion 9 of the drainage collecting pipe.

  The fire spread prevention device 3 closes the side branch pipe connection portion 9 that opens to the floor where the drainage collecting pipe 2 opens in the event of a fire that causes the side branch pipe 4 to disappear, and flame and hot air are discharged from the drainage collecting pipe 2. Can be prevented from entering the interior. For this reason, the drainage pipe structure 1 in which the fire spread prevention device 3 is adopted is not limited to the upper floor Fu even when the side branch pipe 4 of the upper floor Fu of the floor Fd where the fire has occurred is made of a flammable material. It is possible to prevent the spread of fire.

  As described above, the blocking plate 15 as the blocking portion is supported by the main body 16 of the fire spread prevention device 3 so as to be movable downward by its own weight. Then, the blocking plate 15 is locked or abutted on the outer peripheral portion of the lateral branch pipe 4 by the downward urging force due to its own weight in a state where the lateral branch pipe 4 is connected to the outlet 11 of the drain collection pipe at room temperature. It is in the state arrange | positioned outside the inflow opening part. The fire spread prevention device 3 has a flammable side branch pipe in a high temperature atmosphere when the side branch pipe 4 has been removed from the receiving port 11 due to man-made, heat or other causes in the event of a fire. In a state of being deformed, burned out, or burned out due to softening or the like, the downward movement hindrance disappears, and the inflow opening is moved or rotated so that it can be closed.

It should be noted that the state that can be closed (the same applies to the following embodiments) is preferably that the entire opening area of the inflow opening or the entire area of the inflow path to the drainage collecting pipe described later is closed. If it is within the range where movement to the upper floor of the smoke can be prevented, it includes the case where the partial area of the opening or inflow passage is not blocked (for example, the flat area of the shielding plate is slightly smaller than the opening area). Meaning.
[Example 2]
FIG. 5 is a front view of another fire spread prevention device 3B attached to the drainage collecting pipe 2, and FIG. 6 is a cross-sectional view taken along the line CC in FIG.

In the following description, the upper side in FIGS. 5 and 6 is referred to as the upper or upper side, the lower side is referred to as the lower or lower side, and the upper and lower sides are referred to as the upper and lower sides. Further, the side in FIG.
The fire spread prevention device 3B includes a blocking plate 15B and a main body 16B.
The blocking plate 15 </ b> B is a rectangular flat plate having four sides having a length larger than the outer diameter of the lateral branch pipe 4, similar to the blocking plate 15 in the fire spread prevention device 3. The blocking plate 15B is longer in the vertical direction than the blocking plate 15, and weights 26B and 26B which are long horizontally are attached to the surfaces 22 and 22 on both sides near the upper end. The shielding plate 15B, the main body 16B, and the weights 26B and 26B are formed of a non-combustible material such as a metal that does not melt due to a flame during a fire, for example, cast iron.

The main body 16 </ b> B includes a blocking plate housing portion 17 </ b> B and an attachment portion 18.
The shielding plate accommodating portion 17B also has a notch 27B similar to the lower notch 19 on the upper side of the shielding plate accommodating portion 17 in the fire spread prevention device 3. The upper cutout 27 </ b> B is smaller in depth than the lower cutout 19, and the rear edge 28 </ b> B is located above the attachment portion 18. Further, the lateral width of the notch 27B is larger than the lateral length of the weight 26B, and the weights 26B and 26B can be accommodated in the concave portion.

Other configurations in the fire spread prevention device 3B are the same as those in the fire spread prevention device 3. In the fire spread prevention device 3B, those having the same configuration as that in the fire spread prevention device 3 are given the same reference numerals in FIGS. 5 and 6 as in FIGS. 2 and 3, and the description thereof is omitted.
In the event of a fire, the operation for preventing a flame or the like from entering the drainage collecting pipe 2 by the fire spread prevention device 3B is the same as the operation by the fire spread prevention device 3.

  In the fire spread prevention device 3B, the shield plate 15B has weights 26B and 26B in the vicinity of the upper end thereof, so that the shield plate 15B can be lowered with a larger force than the fire spread prevention device 3. For example, the fire spread prevention device 3B can reduce the opening area of the side branch pipe connecting portion 9 by lowering the blocking plate 15B when the resin forming the side branch pipe 4 is softened by the surrounding heat. Therefore, the amount of flame and hot air entering the drainage collecting pipe 2 can be reduced at an early stage, and the risk of spreading fire to the upper floor can be further reduced.

Further, the notch 27B provided on the upper side of the shielding plate accommodating portion 17B can accommodate the weights 26B and 26B. Therefore, even if the shielding plate accommodating portion 17B is raised and the length (height) of the shielding plate 15B in the vertical direction is shortened, the shielding plate 15B is not obstructed from moving by the weight 26B, and the lateral branch pipe connecting portion 9 can completely cover the opening in the receiving port 11 (FIG. 6B). Due to the combination of the vertically long shield plate receiving portion 17B and the short shield plate 15B, the fire spread prevention device 3B can stably hold the shield plate 15B in the main body 16B during normal times, and smoothly shuts off in the event of a fire. The plate 15B can be moved downward.
Example 3
FIG. 7 is a front view of another fire spread prevention device 3 </ b> C attached to the drainage collecting pipe 2, and FIG. 8 is a cross-sectional view taken along the line DD in FIG. 7.

In the following description, the upper side in FIGS. 7 and 8 is referred to as the upper or upper side, the lower side is referred to as the lower or lower side, and the upper and lower sides are referred to as the upper and lower sides. Moreover, the horizontal in FIG. 8 is called horizontal or horizontal direction.
The fire spread prevention device 3C includes a shielding plate 15C, a main body 16C, and shielding plate moving members 29C and 29C.
The blocking plate 15 </ b> C is a rectangular flat plate having four sides having a length larger than the outer diameter of the lateral branch pipe 4, similar to the blocking plate 15 in the fire spread prevention device 3. The blocking plate 15C has upper claw portions 30C and 30C at both lateral ends at the upper end thereof.

The main body 16 </ b> C includes a blocking plate housing portion 17 </ b> C and a mounting portion 18.
The shielding plate accommodating portion 17C is provided with lower claw portions 31C and 31C on outer surfaces in the vicinity of the lower ends of the leg portions 19 and 19, respectively. One lower claw portion 31C is positioned vertically below one upper claw portion 30C, and the other lower claw portion 31C is positioned vertically below the other upper claw portion 30C.
The blocking plate moving members 29C and 29C are for lowering the blocking plate 15C. The blocking plate moving members 29C and 29C are formed by tension coil springs. The shield plate moving members 29C and 29C have the main body 16C fixed to the horizontal branch pipe connecting portion 9 of the drainage collecting pipe 2, and the lower side of the shield plate 15C is accommodated in the shield plate accommodating portion 17C. It is connected to the upper claw portion 30C and one lower claw portion 31C. In the fire spread prevention device 3C incorporated in the drainage pipe structure, the urging force for moving the shielding plate 15C downward is always working by the shielding plate moving members 29C and 29C.

Other configurations in the fire spread prevention device 3C are the same as those in the fire spread prevention device 3. In the fire spread prevention device 3C, those having the same configuration as that in the fire spread prevention device 3 are given the same reference numerals in FIGS. 7 and 8 as in FIGS. 2 and 3, and the description thereof is omitted.
In the event of a fire, the operation for preventing a flame or the like from entering the drainage collecting pipe 2 by the fire spread prevention device 3C is the same as the operation by the fire spread prevention device 3.

  In the fire spread prevention device 3C, a force to constantly move the shield plate 15C downward is applied by the shield plate moving members 29C and 29C. Therefore, when the horizontal branch pipe 4 is softened by a flame or the like and cannot withstand the urging force of the blocking plate moving members 29C and 29C, the blocking plate 15C moves downward according to the degree of softening of the horizontal branch pipe 4, The opening area of the receiving port 11 of the branch pipe connecting part 9 is reduced. Therefore, the amount of flame and hot air entering the drainage collecting pipe 2 can be reduced early.

Moreover, since the fire spread prevention device 3C moves the blocking plate 15C with a stronger force, the opening portion of the receiving port 11 in the side branch pipe connection portion 9 can be closed at an early stage after the side branch pipe 4 is softened or disappeared ( FIG. 8 (b)), it is possible to more reliably prevent the spread of fire to the upper floor.
[Reference Example 1]
9 is a front view of another fire spread prevention device 3D attached to the drainage collecting pipe 2, and FIG. 10 is a cross-sectional view taken along the line EE in FIG.

In the following description, the upper side in FIGS. 9 and 10 is referred to as the upper or upper side, the lower side is referred to as the lower or lower side, and the upper and lower sides are referred to as the upper and lower sides. Further, the horizontal direction in FIG. 10 is referred to as the horizontal direction in the fire spread prevention device 3D.
The fire spread prevention device 3D includes a blocking plate 15D, and a main body configured by a mounting portion 32D and a rotation shaft 33D.

The blocking plate 15D is a substantially rectangular flat plate having four sides having a length larger than the outer diameter of the lateral branch pipe 4 (see FIG. 10B). The upper end of the shielding plate 15D is supported by the mounting portion 32D so as to be rotatable around the rotation shaft 33D. The shielding plate 15D and the main body are formed of a non-combustible material such as a metal that does not melt by a flame at the time of a fire, such as cast iron.
The attachment portion 32D is formed of a substantially rectangular flat plate. The mounting portion 32D has a lateral length substantially equal to the lateral length of the blocking plate 15D. The attachment portion 32D supports the blocking plate 15D at the lower edge thereof. The attachment portion 32 </ b> D is fixed to the side surface of the support portion 13 in the lateral branch pipe connection portion 9 by bolts 24 and 24. Although it is easy to attach the fire spread prevention device 3D to the drainage collecting pipe 2, the present invention is not limited to this, and the fire spread prevention device 3D is not limited to this, but the floor spread slab 6 or the vertical pipe 5 can be devised. It can also be installed or attached to.

  The fire spread prevention device 3D is configured such that the shielding plate 15D has a side branch pipe in a state where an end portion (a part of the shielding plate 15D) farthest from the rotating shaft 33D is locked or abutted on the outer peripheral upper surface of the transverse branch pipe 4. It is attached to the connection part 9. The fire spread prevention device 3D can be attached to the side branch pipe connecting portion 9 either before or after the side branch pipe 4 is connected to the drainage collecting pipe 2. In this way, the blocking plate 15D as the blocking portion is supported by the main body so as to be rotatable. The blocking plate 15D may be locked or brought into contact with the outer peripheral surface of the horizontal branch pipe 4 indirectly by interposing a buffer material or the like between them.

The blocking plate 15D can have a shape other than a rectangle, for example, a circle, an ellipse, or an oval. Moreover, it may have not only a flat plate shape but also a curved surface.
In the fire spread prevention device 3D, when the side branch pipe 4 disappears due to a fire, the shielding plate 15D rotates in the direction of arrow R in FIG. 9 due to its own weight, and the opening portion of the receiving port 11 in the side branch pipe connection portion 9 (from the side branch pipe) The drainage inflow opening) is mechanically closed (FIG. 10B). By this operation of the shielding plate 15D, the fire spread prevention device 3D blocks the flame and hot air from entering the drainage collecting pipe 2 and prevents the fire from spreading to the upper floor.

As described above, the shielding plate 15D as the shielding part is supported by the main body of the fire spread prevention device 3D so as to be rotatable by its own weight. The shielding plate 15D is in contact with the outer peripheral surface of the side branch pipe 4 by the rotational biasing force due to its own weight in a state where the side branch pipe 4 is connected to the outlet 11 of the drainage collection pipe at normal temperature. Although it is in the state of being arranged outside, the connection of the lateral branch pipe 4 to the receiving port 11 is disconnected and the lateral branch pipe is removed, or the flammable lateral branch pipe is softened in a high temperature atmosphere at the time of a fire. In the state of being deformed or burned out, the rotation obstruction in the rotation direction is eliminated, and the inflow opening is rotated to a state where it can be closed.
Example 4
FIG. 11 is a schematic view of another fire spread prevention device 3E. 11A is a front view of the fire spread prevention device 3E, and FIG. 11B is a cross-sectional view taken along line FF in FIG.

The fire spread prevention device 3E includes a main body that includes a blocking plate 15E, a mounting portion 32D, and a rotation shaft 33D.
The blocking plate 15E is formed of a substantially rectangular flat plate, and a weight 26E is integrated by a weight support portion 35E near the edge on the side facing the rotation shaft 33D. Other configurations in the fire spread prevention device 3E are the same as those in the fire spread prevention device 3D. In the fire spread prevention device 3E, those having the same configuration as the fire spread prevention device 3D are given the same reference numerals in FIG. 11 as in FIGS. 9 and 10, and the description thereof is omitted.

The operation of the fire spread prevention device 3E at the time of a fire is the same as that of the fire spread prevention device 3D. However, since the fire spread prevention device 3E has the weight 26E, the blocking plate 15E can start the operation of closing the opening portion of the receiving port 11 in the lateral branch pipe connecting portion 9 earlier than the fire spread prevention device 3D. In addition, the dashed-two dotted line in FIG. 11 shows the state which the shielding board 15E closed the opening part of the receptacle 11 at the time of a fire.
[Reference Example 2]
FIG. 12 is a schematic view of another fire spread prevention device 3F. 12A is a front view of the fire spread prevention device 3F, and FIG. 12B is a cross-sectional view taken along line GG in FIG.

The fire spread prevention device 3F includes a shielding plate 15D, a main body constituted by the attachment portion 32F and the rotating shaft 33D, and shielding plate rotating members 36F and 36F.
The shielding plate 15D and the rotation shaft 33D are substantially the same as those in the fire spread prevention device 3D.
The attachment portion 32F has a larger width (length in the vertical direction in FIG. 12) than the attachment portion 32D in the fire spread prevention device 3D. The reason why the width of the attachment portion 32F is large is that the short arms 37F and 37F of the blocking plate rotating members 36F and 36F can be supported.

  The shield plate rotation member 36F is for causing the shield plate 15D to rotate in the arrow R direction. The blocking plate rotating member 36F is a torsion spring, and the rotating shaft 33D is passed through the winding portion so that the short arm 37F locks the mounting portion 32F and the long arm 38F locks the blocking plate 15D. It is incorporated in the fire spread prevention device 3F. When the fire spread prevention device 3F becomes a part of the drainage pipe structure, the end of the shield plate rotating member 36F that is farthest from the pivot shaft 33D of the shield plate 15D presses the outer peripheral surface of the horizontal branch pipe 4 when it is normal. The blocking plate 15D is urged so as to.

Other configurations in the fire spread prevention device 3F are the same as those in the fire spread prevention device 3D. For the fire spread prevention device 3F having the same configuration as the fire spread prevention device 3D, the same reference numerals as in FIGS. 9 and 10 are given in FIG. 12, and the description thereof is omitted.
The operation of the fire spread prevention device 3F at the time of a fire is the same as that of the fire spread prevention device 3D. However, in the fire spread prevention device 3F, the shield plate 15D is biased by the shield plate rotating members 36F and 36F, so the opening portion of the receiving port 11 by the shield plate 15D is closed earlier than the fire spread prevention device 3D. An operation can be initiated. In addition, the dashed-two dotted line in FIG. 12 shows the state which the shielding board 15D closed the opening part of the receptacle 11 at the time of a fire.
Example 5
13 is a front view of another fire spread prevention device 3G attached to the drainage collecting pipe 2, and FIG. 14 is a cross-sectional view taken along line HH in FIG.

In the following description, the upper side in FIGS. 13 and 14 is referred to as the upper or upper side, the lower side is referred to as the lower or lower side, and the upper and lower sides are referred to as the upper and lower sides. Further, the horizontal direction in FIG. 14 is referred to as a horizontal direction.
The fire spread prevention device 3G includes a main body 16G and blocking plates 38Ga and 38Gb.
The main body 16G includes an annular portion 39G (including a blocking plate support portion 40G) and an attachment portion 18G.

The annular portion 39G is an annular flat plate, and its outer diameter is slightly smaller than the outer diameter of the flange 12 of the lateral branch pipe connecting portion 9 and its inner diameter is slightly larger than the outer diameter of the lateral branch pipe 4. The annular portion 39G has a blocking plate support portion 40G having a certain lateral width and extending upward on the upper side thereof. The blocking plate support portion 40G is continuous with the attachment portion 18G on the tip side.
The attachment portion 18G is orthogonal to the blocking plate support portion 40G and extends in the horizontal direction (lateral direction in FIG. 13).

The annular portion 39G and the attachment portion 18G are manufactured integrally from the same plate material.
The blocking plates 38Ga and 38Gb are obtained by equally dividing a circular plate having a diameter larger than the outer diameter of the lateral branch pipe 4 into two. The shielding plates 38Ga and 38Gb extend outward in the vicinity of one end of the dividing surface, and the extended portions are rotatably supported by the shielding plate support portion 40G constituting the main body 16G by the rotation shafts 41G and 41G, respectively. ing. The shielding plates 38Ga and 38Gb are supported by the shielding plate support portion 40G so that surfaces (hereinafter referred to as “divided surfaces”) 42G and 42G corresponding to the divided surfaces can be substantially in contact with each other.

  The fire spread prevention device 3G is attached to the lateral branch pipe connecting portion 9 by attaching the mounting portion 18G on the supporting portion 13 of the flange 12 and using the screws 24, 24 penetrating the mounting portion 18G as female screws of the supporting portion 13. It is done by screwing and tightening. The fire spread prevention device 3G is attached to the side branch pipe connecting portion 9 before the side branch pipe 4 is connected to the drainage collecting pipe 2. The horizontal branch pipe 4 is inserted into the receiving port 11 of the horizontal branch pipe connecting portion 9 after the closed blocking plates 38Ga and 38Gb are separated and connected to the drainage collecting pipe 2 (see FIG. 14A).

The fire spread prevention device 3G operates as follows.
The fire spread prevention device 3G is maintained in a state in which the blocking plates 38Ga and 38Gb are opened by being locked to the outer periphery of the lateral branch pipe 4 during normal times. However, the side branch pipe 4 formed of a flammable resin is burnt down or disappears due to a fire, or the insertion of the side branch pipe 4 into the receiving port 11 is removed due to heat, heat in the fire or other causes. When 4 is removed, the blocking plates 38Ga and 38Gb rotate in the direction of arrow R shown in FIG. The blocking plates 38Ga and 38Gb rotate until the respective split surfaces 42G and 42G come into contact with each other, close the opening hole at the center of the annular portion 39G of the main body 16G, and connect the inside of the drainage collecting pipe 2 and the floor where the fire has occurred. Cut off.

  As described above, when the side branch pipe 4 disappears or the side branch pipe is removed due to a fire, the blocking plate 15D rotates in the direction of arrow R in FIG. Is closed (FIG. 14B). By this operation of the blocking plates 38Ga and 38Gb, the fire spread prevention device 3G blocks the flame and hot air from entering the drainage collecting pipe 2 and prevents the fire from spreading to the upper floor.

In this way, the fire spread prevention device 3G closes the side branch pipe connection portion 9 where the drainage collecting pipe 2 opens to the fire occurrence floor when a fire occurs, and flame and hot air enter the inside of the drainage collecting pipe 2. Can be prevented. The drainage pipe structure employing the fire spread prevention device 3G can prevent the fire from spreading to the upper floor even when the horizontal branch pipe 4 on the upper floor where the fire broke out is made of flammable material. it can.
Example 6
FIG. 15 is a schematic view of another fire spread prevention device 3H. 15A is a front view of the fire spread prevention device 3H, and FIG. 15B is a cross-sectional view taken along arrows II in FIG.

The fire spread prevention device 3H includes a main body 16G and blocking plates 38Ga and 38Gb.
In the fire spread prevention device 3H, a cylindrical weight 43H having a low height is integrated with each of the shielding plates 38Ga and 38Gb. The weights 43H and 43H are fixed near the side surfaces of the shielding plates 38Ga and 38Gb that are slightly separated from the dividing surface 42G and are curved, and when the lateral branch pipe 4 disappears, the shielding plates 38Ga and 38Gb are moved in the direction of the arrow R with a stronger force. Is intended to pivot. The weights 43H and 43H are made of a nonflammable material such as a metal having a relatively high melting point such as cast iron, similarly to the blocking plates 38Ga and 38Gb or the main body 16G.

Other configurations in the fire spread prevention device 3H are the same as those in the fire spread prevention device 3G. For the fire spread prevention device 3H having the same configuration as that of the fire spread prevention device 3G, the same reference numerals as in FIGS. 13 and 14 are given in FIG.
In addition, the operation of the fire spread prevention device 3H during a fire is the same as that of the fire spread prevention device 3G. However, since the fire spread prevention device 3H has the weights 43H and 43H, the blocking plates 38Ga and 38Gb start to close the opening portion of the receiving port 11 in the lateral branch pipe connection portion 9 more quickly than the fire spread prevention device 3G. obtain. In addition, the dashed-two dotted line in FIG. 15 shows the state which the shielding plates 38Ga and 38Gb closed the opening part of the receptacle 11 (annular part 39G) at the time of a fire.
Example 7
FIG. 16 is a schematic view of another fire spread prevention device 3J. In FIG. 15, (a) is a front view of the fire spread prevention device 3J, and (b) is a cross-sectional view taken along line JJ in (a).

The main body 16J in the fire spread prevention device 3J includes an attachment portion 18J and a blocking plate support portion 40J. Each of the attachment portion 18J and the blocking plate support portion 40J is a rectangular flat plate. The mounting portion 18J and the blocking plate support portion 40J are continuous with an L-shaped cross section so as to be orthogonal to each other.
The fire spread prevention device 3J has substantially the same configuration as the fire spread prevention device 3H, except that the main body 16J does not have the annular portion 39G in the fire spread prevention device 3H. In FIG. 16, the same components as those in the fire spread prevention device 3H are denoted by the same reference numerals as those in the fire spread prevention device 3H (FIG. 15).
Example 8
17 is a diagram showing an outline of the drainage pipe structure 1K, and FIG. 18 is a cross-sectional view taken along the line KK in FIG.

In the following description, the upper side in FIG. Further, the horizontal direction in FIG. 18 is referred to as a horizontal direction.
In FIG. 17, the drainage pipe structure 1K includes a penetrating vertical pipe 44K, a bend pipe 45K, a horizontal main pipe 46K, and a fire spread prevention device 3K. In the condominium, wastewater generated at each floor is collected by the drainage collecting pipe 2 and flows downward. In many cases, the lower main floor is sewer piped by a horizontal main pipe 46K that is slightly inclined with respect to the horizontal. It is sent to the connection place with etc. The drainage pipe structure 1K is for sending wastewater flowing down substantially vertically to a sewer pipe or the like.

  The penetrating vertical pipe 44K is a straight circular pipe, in the through hole 7 that penetrates the floor slab 6 that is a fire prevention section that divides the upper floor and the lower floor of the building, with the upper part on the upper floor Fu and the lower part Are fixed to the lower floor Fd. A bend pipe 45K is connected to the lower end of the penetrating vertical pipe 44K. Connected to the upper end of the penetrating vertical pipe 44K is a vertical pipe that allows the drainage collected in the drainage collecting pipe on the upper floor of the upper floor Fu to flow down. The penetrating vertical pipe 44K is made of cast iron such as gray cast iron and spheroidal graphite cast iron, non-combustible metal material such as steel and stainless steel, or a fireproof double-layer pipe having a two-layer structure of a vinyl chloride pipe and a fiber mortar pipe. The

The bend pipe 45K is a pipe bent at approximately 90 degrees, and is for guiding the collective drainage flowing down substantially vertically through the penetrating vertical pipe 44K to a substantially horizontal horizontal main pipe 46K.
The bend pipe 45K is connected to the penetrating vertical pipe 44K by inserting the lower end of the penetrating vertical pipe 44K into the receiving port 47K opening upward. The bend pipe 45K, like the penetrating vertical pipe 44K, has a two-layer structure of a non-combustible metal material such as gray cast iron and spheroidal graphite cast iron, steel, stainless steel, or a vinyl chloride pipe and a fiber mortar pipe. Manufactured with a layered tube.

The bend pipe 45K is supported on the lower surface of the floor slab 6 by a suspension fitting 54K including a band 52K and a suspension bolt 53K.
The horizontal main pipe 46K is a circular pipe formed of a combustible material such as hard vinyl chloride resin. The end of the horizontal main pipe 46K is inserted into a receiving port 48K provided on the discharge side of the bend pipe 45K, and the flange-shaped pusher wheel 49K is fastened to the flange 51K at the end of the bend pipe 45K by bolts 50K and 50K. Connected to the bend tube 45K.

  Further, as the horizontal main pipe 46K, a fireproof double-layer pipe, a fireproof multilayer resin pipe, or a heat-resistant resin pipe can also be used. In the case of using a fireproof double-layer pipe, it is conceivable to use the combustible vinyl chloride pipe portion that is an internal pipe exposed at the connection portion of the drainage collecting pipe with the side branch pipe connecting portion 9. Further, here, the fireproof multilayer pipe means a resin pipe having a three-layer structure in which a flammable resin such as a vinyl chloride pipe is provided in the inner and outer layers, and an intermediate layer is formed of a resin layer having thermal expansion and fire resistance. The heat-resistant resin pipe means a heat-resistant vinyl chloride resin pipe that is more resistant to heat than a normal vinyl chloride pipe and other heat-resistant resin pipes.

The fire spread prevention device 3K includes a blocking plate 15K and a weight 26K, and a main body including a mounting portion 32K and a rotating shaft 33K.
The attachment portion 32K is for fixing the fire spread prevention device 3K to the push wheel 49K. The attachment portion 32K holds the rotation shaft 33K in the vicinity of the upper end and the side surface of the push wheel 49K.
The shielding plate 15K is for covering the opening portion of the push wheel 49K in the event of a fire (see FIG. 18B), and is formed of a substantially circular plate material having a diameter larger than the inner diameter of the opening portion of the push wheel 49K. . Further, the diameter of the blocking plate 15K is the same as the triangle centered on the bolt hole of the pusher wheel 49K, and the opening part of the pusher wheel 49K is not obstructed by the heads of the bolts 50K, 50K, 50K passed through the bolt hole. It is a size that can cover. The shielding plate 15K extends radially outward at a part of the circumference, and is rotatably supported by the mounting portion 32K, which is the main body, via the rotation shaft 33K.

The weight 26K is connected to the blocking plate 15K by a weight support portion 35K.
The fire spread prevention device 3K becomes a part of the drainage pipe structure 1K when the mounting portion 32K is fixed to the push wheel 49K by screws 24K and 24K. Thereafter, the shield plate 15K is maintained in a state where the end of the side opposite to the side supported by the rotating shaft 33K is supported by the horizontal main pipe 46K (FIG. 18A).

The shielding plate 15K may not have the weight 26K as long as it rotates to its own weight.
Next, the operation of the fire spread prevention device 3K during a fire will be described.
A fire occurs on the floor (lowermost floor) where the fire spread prevention device 3K is provided, and the horizontal main pipe 46K softens and burns and disappears. Then, the blocking plate 15K starts to rotate in the direction of the arrow R in FIG. 17 by a moment such as the weight 26K. The blocking position 15K rotates until it comes into contact with the side surface of the push wheel 49K, and closes the opening of the push wheel 49K as shown in FIG.

As described above, when the opening portion of the push wheel 49K is closed by the blocking plate 15K, the flow path on the outflow side of the bend pipe 45K constituted by the inner space of the push wheel 49K is mechanically blocked. Is prevented from entering the inside of the vertical pipe 44K or the drainage collecting pipe 2 provided in The drainage pipe structure 1K having the fire spread prevention device 3K can prevent the fire spread to the upper floor even when the vertical pipe and the side branch pipe installed on the upper floor are made of a combustible material. As a means for connecting the horizontal main pipe 46K to the bend pipe 45K, instead of using the push wheel 49K, for example, a receiving port type as shown in FIG. 2 or FIG. The fire spread prevention device 3 or the fire spread prevention device 3D can be employed. In this case, the outlet side opening of the bend pipe is closed by the blocking plate.
[Reference Example 3]
19 is a front partial cross-sectional view of another fire spread prevention device 3L in the drainage pipe structure 1L, and FIG. 20 is a cross-sectional view taken along line LL in FIG.

The fire spread prevention device 3L includes a main body constituted by a tubular body 55L and a mounting portion 32L and a blocking portion 56L.
The tubular body 55L includes a small-diameter portion 57L, a large-diameter portion 58L, and a support portion 13L.
The small diameter portion 57 </ b> L is a cylindrical portion having an outer diameter equal to the outer diameter of the lateral branch pipe 4. The inner diameter of the small diameter portion 57L is substantially equal to the inner diameter of the lateral branch pipe 4. The large diameter portion 58L is a cylindrical portion that is continuous with one end of the small diameter portion 57L and has a larger outer diameter than the small diameter portion 57L. The large-diameter portion 58L has an inner diameter on the small-diameter portion 57L side that is equal to the inner diameter of the small-diameter portion 57L, has a step, and the inner diameter is large and is open (an end opposite to the small-diameter portion 57L) It continues until. The support portion 13L is a substantially rectangular plate-like portion provided at a part of the outer periphery of the open end of the large-diameter portion 58L, and both surfaces of the support portion 13L extend outward at right angles to the axis of the tubular body 55L.

The blocking unit 56L includes a blocking plate 15L.
The attachment portion 32L is formed of a substantially rectangular flat plate. The mounting portion 32L has a lateral length larger than the outer diameter of the lateral branch pipe 4, and is substantially equal to the outer diameter of the large-diameter portion 58L of the tubular body 55L. The mounting portion 32L has a rotation shaft 33L that rotatably supports the blocking plate 15L at the lower edge thereof. The attachment portion 32L is fixed to the support portion 13L of the tubular body 55L by bolts 24 and 24.

The blocking plate 15L is a substantially rectangular flat plate having four sides having a length substantially equal to the outer diameter of the large diameter portion 58L of the tubular body 55L (see FIG. 20). The shielding plate 15L is rotatably supported at its upper end by a mounting portion 32L that constitutes the main body by a rotating shaft 33L.
The tube body 55L and the blocking portion 56L are made of a non-combustible material such as a metal that does not melt by a flame at the time of a fire, for example, cast iron.

  In the fire spread prevention device 3L, after the pipe body 55L and the blocking part 56L are connected, the small diameter part 57L is inserted into the receiving port 11 of the side branch pipe connection part 9 and connected to the drainage collecting pipe 2. The connection by inserting the small-diameter portion 56L into the receiving port 11 is the same as the manner in which the side branch pipe 4 is inserted and connected to the side branch pipe connection portion 9. Subsequently, the rotation end of the blocking plate 15L is rotated upward so that the end of the large diameter portion 58L is opened, and the lateral branch pipe 4 is inserted into the large diameter portion 58L. The horizontal branch pipe 4 is inserted until it hits the step formed by the large diameter part 58L and the small diameter part 57L, and is connected to the drainage collecting pipe 2 via the fire spread prevention device 3L. And the inflow path of the waste_water | drain from the side branch pipe 4 to the waste_water | drain collecting pipe 2 is formed of the pipe path inside the pipe 55L.

The fire spread prevention device 3L performs the same operation as the fire spread prevention device 3D in the event of a fire. That is, when the side branch pipe 4 disappears due to a fire or the side branch pipe is removed, the blocking plate 15L rotates in the direction of arrow R in FIG. 19 due to its own weight, and closes the opening portion of the large diameter portion 58L in the tubular body 55L ( As a result, the drainage inflow passage to the drainage collecting pipe 2 is blocked. By this operation of the shielding plate 15L, the fire spread prevention device 3L blocks the flame and hot air from entering the drainage collecting pipe 2 and prevents the fire from spreading to the upper floor.
Example 9
FIG. 21 is a view showing a drainage pipe structure 1M in another form.

The drainage pipe structure 1M is configured with the vertical pipe 5M, the drainage collecting pipe 2M, the side branch pipe 4, the fire spread prevention device 3 and the like as one unit.
The lateral branch pipe 4 and the fire spread prevention device 3 in the drain piping structure 1M have the same configuration as the lateral branch pipe 4 and the fire spread prevention device 3 in the drain piping structure 1 in FIG.
FIG. 1 shows a state where drainage piping structures 1 provided on the lower floor Fd and the upper floor Fu are connected.

The vertical pipe 5M is fixed by being backfilled with an upper end opened to the upper floor in a through-hole 7 that penetrates the floor slab 6, which is a fire prevention section that divides the upper floor and lower floor of the building, and the lower end is The floor extends to the vicinity of the floor slab. The upper end of the vertical pipe 5M is a receiving port type collecting pipe connecting part 59M for connecting the lower end of the drainage collecting pipe 2M.
The collecting pipe connecting portion 59M includes a collecting pipe insertion hole 60M provided in the vicinity of the upper end in the pipe flow path of the standing pipe 5M, and a flange portion 61M provided at the upper end. The collecting pipe insertion hole 60M has a larger inner diameter than the outer diameter of the lower connection part 62M in the drainage collecting pipe 2M, which will be described later, and a depth (depth) substantially equal to the length of the lower connection part 62M. At the deepest portion of the collecting tube insertion hole 60M, a lower locking surface 63M, which is an annular surface facing upward, is formed due to the difference in inner diameter between the collecting tube insertion hole 60M and the in-tube flow path. A flange-like flange portion 61M is provided at the upper end portion of the collecting pipe connection portion 59M.

  A metal pipe such as cast iron is used for the vertical pipe 5M. As the vertical pipe 5M, another fireproof pipe, for example, a fireproof double-layer pipe in which an inner pipe made of hard vinyl chloride resin is covered with an outer pipe of mortar containing fibers may be used. Further, as the vertical pipe 5M, in addition to the above materials, a vinyl chloride pipe or the above-mentioned fireproof multilayer resin pipe can also be used. In this case, although it is necessary to take the piping form for giving fire resistance as a drain piping structure, description is abbreviate | omitted here.

The drainage collecting pipe 2M is installed near the upper surface of the floor slab 6 so that its internal flow path is vertical, and includes a pipe body 64M, a lower connection part 62M, a side branch pipe connection part 9, an upper connection part 65M, and the like. Have
The pipe body 64M has a substantially frustoconical appearance and an internal shape in which the upper part is substantially cylindrical and the lower part is reduced in inner diameter toward the lower part, and the inside of the pipe body is restricted so that the drained water does not flow back to the horizontal branch pipe. A diversion guide (not shown) or the like is provided.

  The lower connection part 62M is formed as a straight pipe having a circular cross section at the lower part of the drainage collecting pipe 2M. In the drainage collecting pipe 2M, the lower connecting portion 62M is connected to the standing pipe 5M by being inserted into the collecting pipe insertion hole 60M of the standing pipe 5M. The drainage collecting pipe 2M is inserted into the collecting pipe insertion hole 60M until the lower end of the lower connecting portion 62M comes into contact with the lower locking surface 63M via the ring-shaped flange portion of the rubber ring for sealing, and the drainage in the drainage pipe structure 1M. The arrangement of the collecting pipe 2M is performed accurately. The lower connecting portion 62M and the collecting pipe connecting portion 59M are sealed by a sealing rubber ring 66M accommodated in the collecting pipe insertion hole 60M, and when the drainage collides with a wall or the like in the drain collecting pipe. The generated vibration is prevented from being transmitted to the slab.

The drain pipe structure 1M having the same configuration as that of the drain pipe structure 1 is given the same reference numerals as those used for the explanation of the drain pipe structure 1 in FIG. 21, and the description thereof is omitted.
In addition, the operation of the fire spread prevention device 3 during a fire is the same as the operation of the fire spread prevention device 3 in the drainage pipe structure 1.
[Reference Example 4]
22 is a view showing a drainage pipe structure 1N according to another embodiment, FIG. 23 is a plan sectional view cut along a section perpendicular to the line MM in FIG. 22, and FIG. 24 is a sectional view taken along line NN in FIG. is there. (A) in FIG.23 and FIG.24 shows before a fire, (b) is a figure which shows after the fire spread prevention apparatus 3N operate | moves by the fire.

The drainage pipe structure 1N includes a drainage collecting pipe 2, a side branch pipe 4, a vertical pipe 5, a fire spread prevention device 3N, and the like. The drainage collecting pipe 2, the lateral branch pipe 4 and the vertical pipe 5 are substantially the same as those in the drainage piping structure 1, and the same reference numerals as those in the drainage piping structure 1 are attached in FIGS. To do.
22 to 24, the fire spread prevention device 3N includes a main body composed of a pipe body 55N and a blocking material accommodating portion 69N, a blocking portion 67N, and a blocking portion driving member 68N.

The tubular body 55N has a cylindrical shape having the same outer diameter as that of the lateral branch pipe 4, and thus includes a small-diameter portion 57N and a cylindrical large-diameter portion 58N having a larger outer diameter than the small-diameter portion 57N. The small diameter part 57N and the large diameter part 58N form a step and are continuous.
The inner diameter of the small diameter portion 57N is substantially equal to the inner diameter of the horizontal branch pipe 4. The small-diameter portion 57N has a blocking portion accommodating portion 69N protruding in the horizontal direction on the large-diameter portion 58N side with respect to the axial center. The blocking portion accommodating portion 69N is hollow and has a substantially rectangular shape with a cross-sectional shape having long sides in the vertical direction. A gap (slit) 71N having a width slightly larger than the thickness of a blocking plate 70N, which will be described later, is provided on the entire inner periphery of the small-diameter portion 57N at the position where the blocking-portion accommodating portion 69N is provided in the axial direction. ing. As shown in FIG. 24, the gap 71 </ b> N is rectangular in the view of the arrow NN in FIG. 23. The blocking portion accommodating portion 69N communicates with the inside of the small diameter portion 57N through a gap 71N.

A blocking portion 67N and a blocking portion driving member 68N are accommodated in the blocking portion accommodating portion 69N.
The blocking part 67N includes a pressure receiving part 72N and a blocking plate 70N. The pressure receiving portion 72N is a rectangular parallelepiped having a rectangular surface whose shape is substantially equal to the cross-sectional shape in the blocking portion accommodating portion 69N. The blocking plate 70N is formed of a substantially rectangular plate material having a width substantially equal to the internal width of the blocking portion accommodating portion 69N and a length slightly larger than the outer diameter of the standpipe 5. The blocking plate 70N spreads in the vertical direction, and is integrated with the vertical end of the pressure receiving portion 72N at substantially the center in the width direction. A part of the other perpendicular end surface of the blocking plate 70N is a concave curved surface having a curvature radius substantially the same as the outer periphery of the standpipe 5. The blocking portion 67N is formed so as to be movable in the radial direction within the tube body 55N, and both sides in the axial direction of the tube body 55N are guided by the surface of the gap 71N and can close the inside of the small diameter portion 57N.

A heat-expandable refractory material formed in a rectangular parallelepiped shape is used for the blocking portion driving member 68N. The blocking part drive member 68N is accommodated between the outer side wall 73N and the pressure receiving part 72N in the blocking part accommodating part 69N.
The heat-expandable refractory material is made of a rubber-based material or a resin material containing thermally expanded graphite. The heat-expandable refractory material expands when its temperature exceeds a predetermined temperature, for example, 200 ° C. or more, and its volume increases 5 to 40 times.

Various such heat-expandable refractory materials are commercially available, and these can be used as the blocking portion driving member 68N.
The large-diameter portion 58N has a side branch pipe insertion hole 74N having an inner diameter substantially equal to the outer diameter of the side branch pipe 4 and having a step with respect to the inner surface of the small diameter portion 57N.
The main body and the blocking part 67N in the fire spread prevention device 3N are made of a noncombustible material such as a metal such as cast iron.

The fire spread prevention device 3N is connected to the drainage collecting pipe 2 by inserting the end portion of the small-diameter portion 57 into the receiving port 11 of the side branch pipe connection portion 9 in the same manner as the side branch pipe 4. Further, the side branch pipe 4 is inserted into the side branch pipe insertion hole 74N of the large diameter portion 58N and connected to the drainage collecting pipe 2 via the fire spread prevention device 3N. In this way, a drainage inflow passage to the drainage collecting pipe 2 is formed by the pipe flow path inside the pipe body 55.
In the fire spread prevention device 3N, when a fire occurs on the floor provided, the blocking portion drive member 68N is heated to expand. The blocking part drive member 68N presses the pressure receiving part 72N in the process of expanding, and the blocking part 67N moves to the insertion hole 21E side in the blocking part accommodating part 69N. The blocking part 67N moves until it comes into contact with the side wall 48E that separates the blocking part accommodating part 69N from the insertion hole 21E, and the inside of the small diameter part 57N following the drainage collecting pipe 2 is closed by the blocking plate 70N. That is, the blocking part 67N is supported by the blocking part accommodating part 69N constituting the main body so as to be movable, and in the event of a fire, the blocking part 67N moves and mechanically blocks the drainage inflow path to the drainage collecting pipe 2.

In this way, the fire spread prevention device 3N prevents the flame and hot air from entering the drainage collecting pipe 2, and even if a flammable material pipe is used for the side branch pipe 5, a fire is caused on the upper floor. Can be prevented from spreading.
Example 10
25 is a view showing a drain pipe structure 1P according to another embodiment, FIG. 26 is a plan sectional view cut along a section perpendicular to the line P-P in FIG. 25, and FIG. 27 is a sectional view taken along arrows Q-Q in FIG. It is. FIG. 25A shows a state before a fire, and FIG. 26B shows a state after the fire spread prevention device 3P is operated by a fire.

Referring to FIGS. 25 to 27, the fire spread prevention device 3P includes a main body 75P, a short pipe 87P constituting a wall member, two blocking plates 15Pa and 15Pb, and two blocking plate driving members 76Pa and 76Pb.
The main body 75P has a circular tubular small diameter portion 77P, a large diameter portion 78P and a blocking chamber portion 79P.
One end of the small diameter portion 77P is continuous with one end of the blocking chamber portion 79P, and the other end of the blocking chamber portion 79P is continuous with the large diameter portion 78P.

The small diameter portion 77 </ b> P has an outer diameter and an inner diameter that are substantially equal to the lateral branch pipe 4. The large diameter portion 78 </ b> P has an inner diameter that is substantially equal to the outer diameter of the lateral branch pipe 4.
The shut-off chamber portion 79P has a substantially rectangular parallelepiped appearance, and forms a shut-off chamber 80P as a space portion therein.
The blocking chamber 80P includes blocking plates 15Pa and 15Pb and blocking plate driving members 76Pa and 76P.
b is accommodated.

  The blocking plates 15Pa and 15Pb are formed of a rectangular plate material having the long side of the short side of the rectangle in the cross section orthogonal to the axis of the small diameter portion 77P of the blocking chamber 80P. Referring to FIG. 26, the blocking plates 15Pa and 15Pb are supported in the blocking chamber 80P in the blocking chamber 80P so that the respective long-side ends can be rotated by the rotating shafts 81Pa and 81Pb. . Moreover, each of the shielding plates 15Pa and 15Pb is formed so as to be pivoted inward so that the end faces 82Pa and 82Pb on the side facing the pivot shaft can be brought into contact with each other. Each end face 82Pa, 82Pb can block the opening 83P of the small-diameter portion 77P that opens to the shut-off chamber 80P when they are brought into contact with each other.

Outside the opening 83P of the small diameter portion 77P, there is provided a flat locking surface 84P for locking the lower surface of the blocking plates 15Pa and 15Pb when the blocking plates 15Pa and 15Pb close the opening 83P. ing. The locking surface 84P functions to keep the state in which the blocking plates 15Pa and 15Pb close the opening 83P stably.
The main body 75P is made of a non-combustible material such as gray cast iron and spheroidal graphite cast iron, steel, stainless steel and the like, and the shielding plates 15Pa and 15Pb are made of non-combustible materials such as steel and stainless steel. Made of metal material.

  The shielding plate driving members 76Pa and 76Pb are made of plate-like thermally expandable refractory material whose thickness is slightly smaller than the distance between the inner surfaces 85Pa and 85Pb on the short side and the rotating shafts 81Pa and 81Pb. It is cut into rectangles according to the shape. The blocking plate driving members 76Pa and 76Pb are arranged in close contact with the inner surfaces 85Pa and 85Pb on the short side in the blocking chamber 80P.

The thermally expandable refractory material used as the shielding plate driving members 76Pa and 76Pb is the same as the shielding material driving member 68N in the fire spread prevention device 3N, and is made of a rubber-based material, a resin material, or the like containing thermally expanded graphite. .
Incorporation of the fire spread prevention device 3P into the drain piping structure 1P is performed as follows.
First, the fire spread prevention device 3 </ b> P is connected to the drainage collecting pipe 2 by fitting the open end of the small diameter portion 77 </ b> P into the receiving port 11 of the side branch pipe connecting portion 9 in the drainage collecting pipe 2. At this time, the end faces 82Pa and 82Pb of the blocking plates 15Pa and 15Pb of the fire spread prevention device 3P are rotated toward the blocking plate driving members 76Pa and 76Pb, and the inward rotation is prevented by the stop pins 86P and 86P. ing.

  Subsequently, the short pipe 87P having the same outer diameter and inner diameter as the lateral branch pipe 4 is pushed into the inside from the open end of the large diameter portion 78P until it comes into contact with the locking surface 84P. For the short pipe 87P, a pipe made of a flammable resin such as hard vinyl chloride resin or a heat softening resin, which is the same as the side branch pipe 4, is used. The short pipe 87P is fixed to the main body 75P by holding or adhesively bonding the outer wall surface of the short pipe 87P and the inner wall surface of the large-diameter portion 78P of the main body 75P by frictional force, or the pipe end of the short pipe 87P and the main body 75P. Both are locked at the locking surface 84P portion of the small diameter portion 77P.

After the short tube 87P is inserted, the stop pins 86P and 86P are pulled out.
Finally, the horizontal branch pipe 4 is fitted into the large-diameter portion 78P, and the drainage collecting pipe 2 and the horizontal branch pipe 4 are connected via the fire spread prevention device 3P. An inflow path through which drainage from the lateral branch pipe 4 flows into the drainage collecting pipe 2 is formed by the pipe path of the small-diameter portion 77P of the main body 75P and the pipe path of the short pipe 87P. The short pipe 87P constitutes a wall member that separates the inflow path to the drainage collecting pipe 2 and the blocking materials 15Pa and 15Pb (in other words, separates the blocking chamber 80P from the inflow path).

In the drain piping structure 1P, when a fire occurs, the side branch pipe 4 and the short pipe 87P soften and burn and disappear. At the same time, the blocking plate driving members 76Pa and 76Pb are heated and heated to expand. The blocking plate driving members 76Pa and 76Pb expand in parallel with the disappearance of the lateral branch tube 4 and the short tube 87P, and rotate the blocking plates 15Pa and 15Pb around the rotation shafts 81Pa and 81Pb. The rotating blocking plates 15Pa and 15Pb are locked to the locking surface 84P and close the opening 83P of the insertion hole 21. In this way, in the drainage pipe structure 1P, in the event of a fire, the shielding plate driving members 76Pa and 76Pb expand to rotate the shielding plates 15Pa and 15Pb, thereby shutting off the inside of the drainage collecting pipe 2 and the fire atmosphere. That is, the blocking members 15Pa and 15Pb, which are blocking portions, are rotatably supported in the blocking chamber portion 79P constituting the main body, and in the event of a fire, the wall member (short pipe 87P) is burned out, burned down or softened. The shielding plate driving member 1P is thermally expanded, and the shielding material 15Pa, 15Pb is rotated to the inflow passage side to mechanically block the drainage inflow passage to the drainage collecting pipe 2.

  As the wall member (short tube 87P), a non-combustible material such as a metal material or a material in which glass fiber is hardened, a heat-resistant resin, etc., instead of the above-described combustible resin or thermosoftening resin material. It is also possible to use a material that is easily deformed by using a heat-resistant material and reducing its tube thickness. In this case, the wall member is simply detached from the main body 75P due to heat at the time of fire or due to the rotational force of the blocking material or a combination thereof, so that the blocking of the inflow path by the blocking material is not hindered.

In this way, the drainage pipe structure 1P having the fire spread prevention device 3P can prevent the fire spreading to the upper floor even when a pipe made of a flammable material is used for the horizontal branch pipe 4.
In addition to mechanically closing as in each of the above-described embodiments, it is conceivable that the pipeline is directly closed by a thermal expansion material portion that has been thermally expanded by heating. In this case, the structure of the fire spread prevention device is compared. However, when applied to a drainage pipe structure, the closed part of the drainage pipe is composed of thermally expanded graphite, inorganic filler, or resin, so that the closed state is the drainage that flows. It can be said that it is fragile and easily broken by the water content and pressure. In contrast, in each of the above embodiments, the inflow path to the drainage collecting pipe or the inflow opening of the drainage collecting pipe or the flow path on the outflow side of the bend pipe or the outflow side opening of the bend pipe is covered with a shielding portion (shielding). Since the block is mechanically blocked by the plate, the block is water resistant and can be tightly blocked, preventing the collapsed state from being easily collapsed or damaged even under the pressure of drainage flowing through the pipe. Is done.

Hereinafter, modified embodiments of the above-described embodiments and reference examples will be described.
(1) In the above-described form, the fire spread prevention devices 3, 3B to 3H, 3J to 3N, and 3P are connected to the drainage collecting pipe 2 and the side branch pipe 4 or to the connection form of the bend pipe 45K and the horizontal main pipe 46K. Accordingly, appropriate changes can be made in accordance with the spirit of the present invention.
(2) A flammable tube made of a resin other than the hard vinyl chloride resin, such as polyethylene resin or ABS resin, may be used for the horizontal branch pipe 4 or the horizontal main pipe 46K. The side branch pipe 4, the standing pipe 5, and the horizontal main pipe 46K can be covered with a material having a sound insulation effect or a heat insulation effect, such as glass fiber.
(3) The drainage collecting pipes 2 and 2M are not made of metal such as gray cast iron, but are fire-resistant two-layered non-combustible structure in which the inner pipe of hard vinyl chloride pipe is covered with the outer pipe of fiber mortar In addition to the above, if sufficient fire resistance is not required, it may be made of a heat resistant resin.
(4) The various modifications described in the first embodiment are applicable to each example other than the first embodiment. That is, the material change of the side branch pipe, the vertical pipe and the drainage collecting pipe, the fire spread prevention devices 3, 3B to 3H, 3J to 3N, 3P are not attached to the drainage collecting pipe 2 or the bend pipe 45K, but the floor slab 6 A support or the like provided on the upper surface and attached to this or attached to a standpipe can be applied to each example.
(5) In each of the above examples, the main body that supports the blocking portion (blocking plate) is separate from the drainage collecting pipe, and the main body is connected to or attached to the drainage collecting pipe, floor slab, vertical pipe, or the like. The main body may be constituted by a part of the drainage collecting pipe without being limited to this configuration. For example, a rotating shaft is directly attached to a horizontal branch pipe connection part that is a part of the drainage collecting pipe, and the shielding plate is rotated to a main body constituted by the horizontal branch pipe connecting part of the drainage collecting pipe through this rotating shaft. You may support freely and may comprise the inflow opening part of a drainage collecting pipe so that closure is possible.
(6) As shown in FIG. 28, the periphery of the side branch pipe of the combustible material is covered with a non-combustible material tubular body (for example, a metal pipe) continuously extending from the side branch pipe connecting portion of the drainage collecting pipe. It is also possible to provide a fire spread prevention device by providing a blocking plate on the side of the body opposite to the side branch pipe connecting portion via a rotating shaft or the like. In this case, the main body of the fire spread prevention device is configured including the tubular body. Although it is desirable in terms of fire resistance that this tubular body covers the side branch pipe connection portion, the fire spread prevention device including the tubular body does not need to be particularly fixed to the side branch pipe connection portion, and may be fixed to the floor slab. In addition, as can be understood from this example, the range meaning of the term of the connection part between the horizontal branch pipe and the drainage collecting pipe where the fire spread prevention device is installed is the connection part between the horizontal branch pipe and the drainage collecting pipe. The meaning includes not only the boundary between the two but also a wide range including a position extending a considerable range on the side branch pipe side.
(7) In addition, each structure of drainage pipe structures 1, 1K to 1N, 1P and fire spread prevention devices 3, 3B to 3H, 3J to 3N, 3P, or the overall structure, shape, dimensions, number, material, etc. It can change suitably according to the meaning of invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for a fire spread prevention device and a drainage pipe structure that collect wastewater generated on each floor in a high-rise apartment or office building and send it to the lower floor.

FIG. 1 is a diagram showing an outline of a drainage pipe structure. FIG. 2 is a front view of the fire spread prevention device attached to the drainage collecting pipe. 3 is a cross-sectional view taken along arrow AA in FIG. FIG. 4 is a view showing the vicinity of the side branch pipe connecting portion when the fire spread prevention device operates. FIG. 5 is a front view of another fire spread prevention device attached to the drainage collecting pipe. 6 is a cross-sectional view taken along the line CC in FIG. FIG. 7 is a front view of another fire spread prevention device attached to the drainage collecting pipe. 8 is a cross-sectional view taken along the line DD in FIG. FIG. 9 is a front view of another fire spread prevention device attached to the drainage collecting pipe. 10 is a cross-sectional view taken along the line EE in FIG. FIG. 11 is a schematic view of another fire spread prevention device. FIG. 12 is a schematic view of another fire spread prevention device. FIG. 13 is a front view of another fire spread prevention device attached to the drainage collecting pipe. 14 is a cross-sectional view taken along line HH in FIG. FIG. 15 is a schematic view of another fire spread prevention device. FIG. 16 is a schematic view of another fire spread prevention device. FIG. 17 is a diagram showing an outline of the drainage pipe structure. 18 is a cross-sectional view taken along the line KK in FIG. FIG. 19 is a front partial cross-sectional view of another fire spread prevention device in the drainage pipe structure. 20 is a cross-sectional view taken along line LL in FIG. FIG. 21 is a view showing a drain piping structure. FIG. 22 is a view showing a drain piping structure in another embodiment. FIG. 23 is a plan sectional view cut along a section perpendicular to the line MM in FIG. 24 is a cross-sectional view taken along line NN in FIG. FIG. 25 is a diagram showing a drainage pipe structure in another form. 26 is a plan sectional view cut along a section perpendicular to the line PP in FIG. 27 is a cross-sectional view taken along the line QQ in FIG. FIG. 28 is a view showing a drain piping structure in another embodiment.

1, 1K to 1N, 1P Drainage pipe structure 2, 2M Drainage collecting pipe 3, 3B to 3H, 3J to 3N, 3P Fire spread prevention device 4 Horizontal branch pipe 5M Standing pipe 6 Floor slabs 15, 15B, 15C, 15D, 15K, 15L, 15Pa, 15Pb Blocking section (blocking plate)
16, 16B, 16C, 16G, 16J Main body 29C Elastic member (blocking plate moving member)
32D, 32F, 32K Supporting part (mounting part)
36F Elastic member (blocking plate rotating member)
38Ga, 38Gb blocking part (blocking plate)
45K Bend tube 46K Horizontal main tube 55L, 55N Support (tube)
67N block part 68N thermal expansion member (block part drive member)
75P body 76Pa, 76Pb thermal expansion member (blocking part drive member)

Claims (10)

A fire spread prevention device installed at a connection portion between a flammable pipe formed of a flammable material and extending in a substantially horizontal direction and a nonflammable pipe formed of a nonflammable material,
Both are made of nonflammable materials,
A flat plate-shaped blocking portion having a portion capable of closing an opening connected to the flammable piping in the non-flammable piping by moving;
A main body that movably supports the blocking portion in a direction perpendicular to the axis of the combustible pipe,
The main body includes a notch capable of accommodating an end of the combustible pipe,
The blocking portion is configured such that the movement is performed by an urging force of an elastic member or a volume increase of a thermal expansion member, and is guided to a state where the notch is closed when moving in the orthogonal direction. A fire spread prevention device characterized by that. A fire spread prevention device installed at a connection portion between a flammable pipe formed of a flammable material and extending in a substantially horizontal direction and a nonflammable pipe formed of a nonflammable material,
Both are made of nonflammable materials,
A blocking part capable of closing the opening connected to the combustible pipe in the non-combustible pipe by rotating;
A main body that rotatably supports the blocking portion;
The blocking portion is a flat blocking plate,
The shield plate is supported so as to be rotatable about the direction orthogonal to the flat portion of the shield plate at the upper part of the main body,
The main body includes a through hole that is blocked by the downward rotation of the blocking plate. A fire spread prevention device installed at a connection portion between a flammable pipe formed of a flammable material and extending in a substantially horizontal direction and a nonflammable pipe formed of a nonflammable material,
Both are made of nonflammable materials,
A blocking part capable of closing the opening connected to the combustible pipe in the non-combustible pipe by rotating;
A main body that rotatably supports the blocking portion by a rotation shaft at an upper portion of the opening,
The blocking part is
A fire spread prevention device, characterized in that it is a flat shield plate, and a weight is provided on an end portion of the surface opposite to the side that closes the opening and away from the rotating shaft. A fire spread prevention device installed at a connection portion between a flammable pipe formed of a flammable material and extending in a substantially horizontal direction and a nonflammable pipe formed of a nonflammable material,
Both are made of nonflammable materials,
A blocking part capable of closing an opening connected to the flammable pipe in the non-flammable pipe;
A main body that movably or rotatably supports the blocking portion,
The blocking part is
It is configured to be movable or rotatable from a state arranged outside the opening to a state where the opening can be closed, and a wall member is separated from the flow path communicating with the noncombustible pipe. A fire spread prevention device, which is disposed outside the flow path or the opening and moves or rotates when the wall member is burned out, burned out, softened or detached. It is installed at a connecting portion between the non-combustible pipe and the combustible pipe, and a part of the blocking portion is locked or abutted on the outer periphery of the combustible pipe and moved when the combustible pipe is removed or The fire spread prevention device according to any one of claims 1 to 3, wherein the flow path that rotates and communicates with the noncombustible pipe is configured to be closed. The fire spread prevention device according to any one of claims 1 to 4, wherein the main body is configured to be attachable to the non-combustible pipe. The fire spread prevention device according to any one of claims 1 to 4, wherein the blocking portion is moved or rotated by its own weight. The fire spread prevention device according to claim 3 or 4, wherein the movement or rotation of the blocking portion is performed by an urging force of an elastic member. The fire spread prevention device according to claim 3 or 4, wherein the movement or rotation of the blocking portion is performed by increasing the volume of the thermal expansion member. The fire spread prevention device according to any one of claims 1 to 4, wherein the nonflammable pipe formed of the nonflammable material is a drainage collecting pipe or a bend pipe.