Refractory structure

Abstract

To provide a coupler that can reliably exhibit fire resistance even with slabs of various thicknesses and can be implemented at low cost.SOLUTION: A coupler 10 comprises an upper connecting pipe 11, an intermediate pipe 15 connected to the upper connecting pipe 11, and a lower connecting pipe 12 connected to the intermediate pipe 15. The intermediate pipe 15 contains a heat-expandable refractory material, and the height of the intermediate pipe 15 is 150 mm or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joint. [Background technology]

[0002] BACKGROUND ART Conventionally, structures for realizing fire resistance in resin drainage manifold joints have been known, as described in, for example, Patent Documents 1 and 2 below. Patent Document 1 describes a drainage pipe joint that penetrates the floor slab of a building from top to bottom. In this structure, a pipe made of a heat-expandable fire-resistant material is placed inside the part where the drainage standpipe penetrates the floor slab, surrounding the entire periphery of the penetration part. Patent Document 2 describes a structure in which a drain pipe joint consisting of an upper body and a lower body penetrates a floor slab. In this structure, an interior member made of a thermally expansive material that expands due to the heat of a fire is provided inside the drain pipe joint. A plurality of blade members called swirl guides are formed on the inner periphery of this interior member, which can swirl the drain water while reducing the flow rate of the water as it flows down. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-98305 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-175187 Summary of the Invention [Problem to be solved by the invention]

[0004] In the structure described in Patent Document 1, a pipe made of a heat-expandable fire-resistant material expands due to the heat of a fire, blocking the drainage pipe and thereby blocking the flow of flames, smoke, etc. In the structure described in Patent Document 1, a swirl vane for creating a swirling flow of wastewater is installed inside the drainage pipe joint, so the installation position of the heat-expandable fire-resistant pipe and the installation position of the swirl vane must be offset in the vertical direction. This is because if an attempt is made to block the pipe at the swirl vane, the swirl vane may get in the way and interfere with smooth blockage of the pipe.

[0005] However, due to the variety of slab thicknesses and other conditions at the actual installation location of the joint assembly, there was a problem in that it was not possible to embed a pipe made of heat-expandable fire-resistant material in the slab and then position the swirl vane below the slab. For example, the thickness of a typical slab varies widely, ranging from approximately 150 to 300 mm, and the thickness of the slab varies depending on the installation environment of the collective joint, so there was a problem in that it was difficult to apply the structure described in Patent Document 1 to all installation environments.

[0006] In the structure described in Patent Document 2, in order to achieve fire resistance, it was necessary to install a swirl vane large enough to block the pipe. However, when the slab is thin, the lower part of the joint assembly is not embedded in the slab, so if a fire breaks out on the floor below, the lower part of the joint may burn down along with the swirl vane, and in some cases, fire resistance may not be achieved.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a joint that can reliably exhibit fire resistance even in slabs of various thicknesses and can be implemented at low cost. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention proposes the following aspects. "1" The joint of this embodiment is a collective joint comprising an upper connecting pipe, an intermediate pipe connected to the upper connecting pipe, and a lower connecting pipe connected to the intermediate pipe, characterized in that the intermediate pipe contains a heat-expandable fire-resistant material and the height of the intermediate pipe is 150 mm or less.

[0009] In a structure in which the lower end of the upper connecting pipe and the upper end of the lower connecting pipe are inserted into a through hole in the floor slab and the through hole is filled with filler material, the intermediate pipe connecting the lower end of the upper connecting pipe and the upper end of the lower connecting pipe contains a heat-expandable fire-resistant material. In the event of a fire, if the slab and the area around the through-hole are heated by flames or smoke, the heat-expandable fire-resistant material contained in the intermediate pipe will expand and block the connection between the upper and lower connecting pipes, preventing flames and smoke from the floor below from spreading to the floors above, thereby preventing the spread of fire.

[0010] If the height of the intermediate pipe is 150 mm or less, the floor slab thickness can be a variety of thicknesses in the range of 150 to 300 mm, and even in different installation environments, the intermediate pipe can be reliably placed in the through-hole of the floor slab, and the fire spread prevention effect can be reliably achieved. Therefore, the structure of this embodiment can be widely applied to any building as long as it has a general slab thickness, and is highly versatile.

[0011] If the slab and the area around the through-hole are heated by flames and smoke during a fire, the lower connecting pipe will melt away due to the heat of the fire. Even if the lower connecting pipe melts away, the intermediate pipe will expand and block the through-hole, reliably preventing the flames and smoke from reaching the upper floors and preventing the fire from spreading. The structure of this embodiment can be realized simply by adopting a structure including a heat-expandable refractory material in the intermediate tube, so there is no need to arrange any additional new components, and it has the characteristic of being easy to implement at low cost.

[0012] "2" The joint of this embodiment is a joint comprising an upper connecting pipe, an intermediate pipe connected to the upper connecting pipe, and a lower connecting pipe connected to the intermediate pipe, characterized in that a fire-resistant layer containing a heat-expandable fire-resistant material is provided on the outer periphery of the lower end of the upper connecting pipe and the outer periphery of the upper end of the lower connecting pipe, which corresponds to the periphery of the intermediate pipe, and the height of the fire-resistant layer is 150 mm or less.

[0013] In a structure in which the lower end of the upper connector and the upper end of the lower connector pipe are inserted into a through-hole in the floor slab and the through-hole is filled with filler, a fire-resistant layer containing a heat-expandable fire-resistant material is provided around the periphery of the part where the lower end of the upper connector pipe and the upper end of the lower connector pipe are connected. When the slab and the area around the through-hole are heated by flames or smoke during a fire, the connection between the upper connector pipe and the lower connector pipe softens, and the heat-expandable fire-resistant material contained in the fire-resistant layer expands, sealing off the connection between the upper and lower connector pipes. This prevents flames and smoke from the floor below from spreading to the floor above, effectively preventing the spread of fire.

[0014] If the height of the fire-resistant layer is 150 mm or less, the fire-resistant layer can be reliably placed in the through-hole of the floor slab, even in various different installation environments with a floor slab thickness in the range of 150 to 300 mm, and the fire spread prevention effect can be reliably exhibited. Therefore, the structure of this embodiment can be widely applied to any building as long as it has a general slab thickness, and is highly versatile.

[0015] If the slab and the area around the through-hole are heated by flames and smoke during a fire, the lower connecting pipe will melt away due to the heat of the fire. Even if the lower connecting pipe melts away, the intermediate pipe will expand and block the through-hole, reliably preventing the flames and smoke from reaching the upper floors and preventing the fire from spreading. The structure of this embodiment can be realized simply by employing a fire-resistant layer containing a heat-expandable fire-resistant material on the outer periphery of the joint between the pipes, so there is no need to place any additional components, and it has the characteristic of being easy to implement at low cost.

[0016] "3" In this form, the lower end of the upper connecting pipe and the upper ends of the intermediate pipe and the lower connecting pipe are components that are placed within the through hole of the floor slab, and it is preferable that a connecting pipe section that connects to the intermediate pipe is formed on the upper side of the lower connecting pipe, and a tapered inclined pipe section is formed on the lower side of the lower connecting pipe, and that the entire connecting pipe section and the upper part of the inclined pipe section are placed within the through hole of the floor slab.

[0017] If the entire connecting pipe section and the upper part of the inclined pipe section are placed within the slab penetration hole, the intermediate pipe containing the heat-expandable fire-resistant material or the fire-resistant layer is securely embedded within the slab penetration hole. Therefore, if the slab and the area around the penetration hole are heated by flames or smoke during a fire, the heat-expandable fire-resistant material contained in the intermediate pipe or the fire-resistant layer will reliably expand within the penetration hole, reliably sealing off the pipe connection within the penetration hole. Furthermore, if the tapered inclined pipe section is embedded in the sound-insulating material within the penetration hole, the inclined pipe section with its slope is supported by the filler material. These features, combined, reliably demonstrate fire resistance by preventing the spread of fire.

[0018] [4] In this embodiment, it is preferable that the outer diameter of the lower end of the connecting pipe section is larger than the outer diameter of the upper end of the inclined pipe section, and that a circumferential step is formed at the boundary between the connecting pipe section and the inclined pipe section.

[0019] If a peripheral step is formed at the lower end of the connecting pipe, when the heat-expandable fire-resistant material contained in the intermediate pipe or fire-resistant layer expands in the event of a fire, the peripheral step will reliably catch on the filler material filling the through hole, preventing the lower connecting pipe from falling. This allows the heat-expandable fire-resistant material to reliably block the pipe connection part inside the through hole, ensuring fire resistance.

[0020] "5" In this embodiment, when the lower end of the upper connecting pipe and the upper ends of the intermediate pipe and the lower connecting pipe are placed in the through holes of the floor slab, it is preferable to fill them with filler material so as to surround them.

[0021] Filling the through-hole with filler improves sound insulation in the through-hole area and also prevents the lower connecting pipe from melting down prematurely through the through-hole in the event of a fire.

[0022] [6] In this embodiment, it is preferable that a swirl vane is provided inside the upper connecting pipe and above the intermediate pipe.

[0023] The presence of the swirl vanes above the intermediate pipes allows the intermediate pipes or the fireproof layer containing the thermally expandable refractory material to expand at the joints between the pipes in the through-holes of the slab, and the swirl vanes do not hinder this expansion when closing the joints, allowing the through-holes to be closed reliably and quickly, thereby achieving fire resistance.

[0024] "7" The joint of this embodiment is a joint comprising an upper connecting pipe and a lower connecting pipe connected to the upper connecting pipe, characterized in that a fire-resistant layer containing a heat-expandable fire-resistant material is provided around the part where the upper connecting pipe and the lower connecting pipe are connected, and the height of the fire-resistant layer is 150 mm or less.

[0025] In a structure in which the lower end of the upper connector and the upper end of the lower connector pipe are inserted into a through-hole in the floor slab and the through-hole is filled with filler, a fire-resistant layer containing a heat-expandable fire-resistant material is provided around the periphery of the part where the lower end of the upper connector pipe and the upper end of the lower connector pipe are connected. When the slab and the area around the through-hole are heated by flames or smoke during a fire, the connection between the upper connector pipe and the lower connector pipe softens, and the heat-expandable fire-resistant material contained in the fire-resistant layer expands, sealing off the connection between the upper and lower connector pipes. This prevents flames and smoke from the floor below from spreading to the floor above, effectively preventing the spread of fire.

[0026] If the height of the fire-resistant layer is 150 mm or less, the fire-resistant layer can be reliably placed in the through-hole of the floor slab, even in various different installation environments with a floor slab thickness in the range of 150 to 300 mm, and the fire spread prevention effect can be reliably exhibited. Therefore, the structure of this embodiment can be widely applied to any building as long as it has a general slab thickness, and is highly versatile.

[0027] If the slab and the area around the through-hole are heated by flames and smoke during a fire, the lower connecting pipe will melt away due to the heat of the fire. Even if the lower connecting pipe does melt away, the fire-resistant layer will expand and block the through-hole, reliably preventing the flames and smoke from reaching upper floors and preventing the fire from spreading. The structure of this embodiment can be realized simply by employing a fire-resistant layer containing a heat-expandable fire-resistant material on the outer periphery of the joint between the pipes, so there is no need to place any additional components, and it has the characteristic of being easy to implement at low cost. [Effects of the Invention]

[0028] According to the present invention, a joint can be provided that can be applied to general slabs of various thicknesses, can reliably exhibit fire resistance, and can be implemented at low cost. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a cross-sectional view showing an example of a fire-resistant structure in which a joint according to an embodiment of the present invention is installed in a through hole in a slab. FIG. [Figure 2] FIG. [Figure 3] FIG. 2 is a development view showing the component configuration of the joint shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view showing a joint according to a second embodiment of the present invention. [Figure 5] FIG. 10 is a cross-sectional view showing a joint according to a first modified example of the second embodiment of the present invention. [Figure 6] FIG. 10 is a cross-sectional view showing a joint according to a second modified example of the second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, with reference to Figs. 1 to 3, an example of a fire-resistant structure in which a joint according to one embodiment of the present invention is applied to a through-hole in a slab will be described. The fire-resistant joint structure 1 according to this embodiment is used for drainage of a building, and is applied to a through-hole H formed in a floor slab S. In the embodiment shown in Fig. 1, a first vertical pipe P1 of an upper floor is provided above a through hole H formed in a floor slab S, and a second vertical pipe P2 of a lower floor is provided below the through hole H. As shown in Figs. 1 and 2, the fire-resistant structure 1 of the joint according to this embodiment includes a drainage collection joint (joint) 10.

[0031] The drainage manifold 10 includes an upper connecting pipe 11 and a lower connecting pipe 12 connected to the upper connecting pipe 11 via an intermediate pipe 15. The upper connecting pipe 11 has a vertical pipe connecting portion 13 connectable to a first vertical pipe P1, a horizontal pipe connecting portion 14 protruding from the side of the vertical pipe connecting portion 13 and connectable to a horizontal pipe P3, and a lower end portion 9 inserted into the through hole H. The drainage manifold joint 10 of this embodiment is composed of an upper connecting pipe 11, a lower connecting pipe 12, and an intermediate pipe 15, which are resin joint components.

[0032] In the following description, the upper connecting pipe 11 side of the vertical pipe connecting portion 13 along the central axis O of the vertical pipe connecting portion 13 will be referred to as the upper side, and the lower connecting pipe 12 side will be referred to as the lower side.

[0033] The vertical pipe connection part 13 has a damming plate 13a on its inner surface. The installation angle of the damming plate 13a is -30° to +30° from the vertical direction. If the installation angle is inclined more than 20°, the swirling flow of wastewater swirled by the inclined plate may not be sufficiently blocked, which may cause backflow into the horizontal pipe P3. Furthermore, if the installation angle is inclined more than -30°, the received wastewater may rebound more, which may disrupt the flow of wastewater and increase pressure fluctuations inside the pipe.

[0034] The horizontal pipe connecting portion 14 extends cylindrically from the peripheral wall of the vertical pipe connecting portion 13 toward the outside in the radial direction perpendicular to the central axis O. In this embodiment, three horizontal pipe connecting portions 14 are arranged in the circumferential direction of the vertical pipe connecting portion 13. Two of the three horizontal pipe connecting portions 14 are individually arranged at positions on either side of the central axis O in the radial direction. The remaining horizontal pipe connecting portions 14 extend in a radial direction perpendicular to the central axis O, in a direction that forms an angle of 90° in plan view with the directions in which the two horizontal pipe connecting portions 14 extend. Note that the number and extending directions of the horizontal pipe connecting portions 14 are not limited to this embodiment and can be changed as desired. As shown in FIG. 1, a horizontal pipe (horizontal branch pipe) P3 is connected to the tip side of each horizontal pipe connecting portion 14.

[0035] The upper connecting pipe 11 is made of, for example, a polyvinyl chloride resin composition containing 0.1 to 1.0 parts by weight of non-expandable graphite per 100 parts by weight of polyvinyl chloride resin. The upper connecting pipe 11 is obtained, for example, by injecting the polyvinyl chloride resin composition into the cavity of a molding machine.

[0036] An intermediate pipe 15 is connected to the lower end 9 of the upper connecting pipe 11. The outer diameter of the intermediate pipe 15 is smaller than the outer diameter of the vertical pipe connecting portion 13 of the upper connecting pipe 11. The upper part of the peripheral wall of the intermediate pipe 15 is fitted inside the lower end 9 of the vertical pipe connecting portion 13.

[0037] The intermediate pipe 15 is made of a resin composition containing, for example, polyvinyl chloride resin and thermally expandable graphite, which is a thermally expandable fire-resistant material. That is, the intermediate pipe 15 is produced by molding the resin composition containing the thermally expandable fire-resistant material. The intermediate pipe 15 is produced, for example, by extrusion molding the resin composition.

[0038] The intermediate pipe 15 may have a single-layer structure in which the entire intermediate pipe 15 is made of a resin composition containing a heat-expandable fire-resistant material, or a multi-layer structure made of multiple layers. In the case of a multi-layer structure, it is sufficient that any one of the layers is made of a resin composition containing a heat-expandable fire-resistant material. For example, if the intermediate pipe 15 has a three-layer structure consisting of a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be made of a resin composition containing a heat-expandable fire-resistant material, and the surface layer, intermediate layer, and inner layer may contain a heat-absorbing agent in their resin compositions.

[0039] As an example, a single-layer structure can be used, which is made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin. Alternatively, a three-layer structure can be used, which is made of a thermally expandable fire-resistant layer made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin, and coating layers of a polyvinyl chloride resin composition that does not contain thermally expandable graphite that cover the inner and outer surfaces of the thermally expandable fire-resistant layer.

[0040] That is, if the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expansion may not be obtained during combustion, and the desired fire resistance may not be obtained.If the amount of thermally expandable graphite is more than 20 parts by weight, the graphite may expand too much upon heating, and may not be able to maintain its shape, causing residue to fall out of the through holes H, resulting in a decrease in fire resistance.

[0041] When the intermediate pipe 15 has a multi-layer structure, the resin composition containing the thermally expandable fire-resistant material is not particularly limited, but preferably contains 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin. The content of the thermally expandable graphite is more preferably 4 to 18 parts by weight, and even more preferably 6 to 16 parts by weight. That is, if the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expansion may not be obtained during combustion, and the desired fire resistance may not be obtained. If the amount of thermally expandable graphite is more than 20 parts by weight, excessive thermal expansion may occur when heated, or the resin component may be insufficient, causing the residue to become brittle and unable to maintain its shape, causing the residue to fall off from the through holes H, and reducing fire resistance. In the present invention, as described below, the height of the intermediate tube 15 (the length in the thickness direction of the slab) is set to be smaller than the thickness of a typical slab, so that even if the content of thermally expandable graphite is relatively high, for example, 8 parts by weight or more, and the residue is brittle, the residue after thermal expansion can be retained within the slab and is less likely to fall off. Furthermore, if the content of thermally expandable graphite is relatively high, for example, 8 parts by weight or more, the compressive strength of the intermediate pipe 15 decreases, and the compression ratio measured based on the flattening test specified in JIS K 6741:2016 becomes 50% or less. Here, when the vertical pipe P1 or horizontal pipe P3 thermally expands or contracts, or when physical forces are applied during construction, stress concentrates at the contact points between the drainage manifold 10 and the upper and lower surfaces of the mortar M. Therefore, if stress is transmitted to the intermediate pipe 15, which has low compressive strength, it is prone to breakage. However, by setting the height of the intermediate pipe 15 to 150 mm or less, in other words, a height smaller than the thickness of a typical slab, stress is less likely to be transmitted to the intermediate pipe 15, making it less likely to break.

[0042] Examples of the polyvinyl chloride resin include polyvinyl chloride homopolymers; copolymers of vinyl chloride monomers and monomers having unsaturated bonds copolymerizable with the vinyl chloride monomers; and graft copolymers in which vinyl chloride is graft-copolymerized onto (co)polymers other than vinyl chloride. These may be used alone or in combination of two or more. If necessary, the polyvinyl chloride resin may be chlorinated.

[0043] The intermediate layer containing thermally expandable graphite is black, so it is preferable that the surface layer and the inner layer contain a colorant other than black so that they can be distinguished from the intermediate layer. The thickness of the surface layer and the inner layer is preferably 0.3 mm to 3.0 mm, and more preferably 0.6 mm to 1.5 mm. If the thickness of the coating layer is 0.3 mm or more, the mechanical strength of the pipe can be sufficiently ensured, and if it is 3.0 mm or less, a decrease in fire resistance can be suppressed. Furthermore, it is preferable that the intermediate tube 15 meets the performance requirements set forth in JIS K6741.

[0044] The thermally expandable graphite used in this embodiment can be, for example, a crystalline compound obtained by acid treating powder of natural scaly graphite, pyrolytic graphite, kish graphite, or the like with an inorganic acid and a strong oxidizing agent to insert the inorganic acid between the layers of the graphite, and then adjusting the pH. As the inorganic acid, concentrated sulfuric acid, nitric acid, selenic acid, etc. can be used. As the strong oxidizing agent, concentrated nitric acid, perchloric acid, perchlorates, permanganates, dichromates, hydrogen peroxide, etc. can be used.

[0045] By adjusting the pH, it is possible to use thermally expandable graphite which is a crystalline compound that maintains the layered structure of carbon and has a pH adjusted to 1.5 to 4.0, and thermally expandable graphite with a 1.3-fold expansion temperature of 180°C to 270°C.

[0046] If the pH of the thermally expandable graphite is less than 1.5, it will be too acidic and may easily cause corrosion of the molding equipment, while if the pH exceeds 4.0, the effect of promoting the carbonization of the polyvinyl chloride resin will be weakened, and sufficient fire resistance may not be achieved. The particle size of the thermally expandable graphite is not particularly limited, but for example, the range of 100 to 400 μm, preferably the range of 120 to 350 μm, can be used.

[0047] The resin composition constituting the intermediate tube 15 may contain additives such as stabilizers, inorganic fillers, flame retardants, lubricants, processing aids, impact modifiers, heat resistance improvers, antioxidants, light stabilizers, UV absorbers, pigments, plasticizers, and thermoplastic elastomers as needed, provided that the purpose of this embodiment is not impaired.

[0048] The height of the intermediate pipe 15 is preferably 30 mm to 150 mm, more preferably 30 mm to 100 mm, and most preferably 30 mm to 80 mm. If the height of the intermediate pipe 15 is less than 30 mm, it is difficult to ensure sufficient joint strength when joining the upper connecting pipe 11 and the lower connecting pipe 12, and the volume required to block the pipe line when heated and expanded is insufficient. If the height of the intermediate pipe 15 exceeds 150 mm, the upper or lower end of the intermediate pipe 15 will protrude above or below the floor slab S if the floor slab S is thin, making it difficult to position the horizontal pipe P3 near the floor. If the lower end of the intermediate pipe 15 is located below the through hole H, the pipe will expand significantly below the through hole H during expansion, increasing the risk of it falling out of the through hole H. If the height of the intermediate pipe 15 is in the range of 30 mm to 150 mm, the typical floor slab thickness is 150 to 300 mm, and if applied to floor slabs of any thickness, the height will be such that the purpose of blocking the pipe line due to thermal expansion when heated by a fire, etc. Also, if the height is in this range, the joint strength can be ensured for floor slabs of a typical thickness, and the height will be such that the intermediate pipe 15 can be accommodated in the through hole H.

[0049] The inner diameter of the intermediate pipe 15 is preferably larger than the inner diameter of the vertical pipe P1, more preferably 100 mm to 200 mm, even more preferably 110 mm to 175 mm, and most preferably 120 mm to 150 mm. As described above, the height of the intermediate pipe 15 is 150 mm or less, and therefore the internal volume of the intermediate pipe 15 is small. Therefore, if the inner diameter of the intermediate pipe 15 is smaller than the inner diameter of the vertical pipe P1, the intermediate pipe 15 is likely to be clogged by the wastewater flowing down from the vertical pipe P1, and excessive positive pressure is likely to occur. On the other hand, if the inner diameter of the intermediate pipe 15 is larger than 200 mm, the inner diameter of the through hole H into which the drainage manifold 10 is inserted must be made larger, which makes it difficult to fill with the filler M and reduces workability.

[0050] The lower connecting pipe 12 is a pipe body whose diameter is smaller below than above. The lower connecting pipe 12 is provided with a connecting pipe section 16 located at its upper end and connected to the lower end of the intermediate pipe 15, an inclined pipe section 17 that tapers downward and is connected below the connecting pipe section 16, and a lower pipe section 18 that is connected to the lower end of the inclined pipe section 17 and to which the second vertical pipe P2 is connected. The connecting pipe section 16, inclined pipe section 17, and lower pipe section 18 are integrally formed by, for example, injection molding of a synthetic resin material.

[0051] The inner diameter of the connecting pipe portion 16 is larger than the outer diameter of the intermediate pipe 15. The lower portion of the peripheral wall of the intermediate pipe 15 is fitted inside the connecting pipe portion 16. The outer diameter of the upper end of the inclined pipe portion 17 is smaller than the outer diameter of the connecting pipe portion 16. Therefore, a peripheral step 16a is formed at the boundary between the lower end of the connecting pipe portion 16 and the upper end of the inclined pipe portion 17. The outer diameter of the lower end of the inclined pipe portion 17 is smaller than the outer diameter of the upper end of the inclined pipe portion 17.

[0052] The outer diameter of the lower pipe section 18 is smaller than the outer diameter of the connecting pipe section 16 and larger than the outer diameter of the lower end of the inclined pipe section 17. The size of the lower pipe section 18 in the direction of the central axis O is smaller than the size of the connecting pipe section 16 in the direction of the central axis O. The second vertical pipe P2 on the lower floor is fitted into the inside of the lower pipe section 18 from below, thereby connecting the second vertical pipe P2 to the lower connecting pipe 12.

[0053] The upper connecting pipe 11 and the lower connecting pipe 12 may be made transparent, which allows the connection state of the upper connecting pipe 11 and the lower connecting pipe 12 to be visually confirmed from the outside. The upper connecting pipe 11 and the lower connecting pipe 12 may also be compounded with a flame retardant such as non-thermal expandable graphite, magnesium hydroxide, or aluminum hydroxide.

[0054] A vertical bush 21, a vertical packing 22, and a vertical ring 23 are provided at the upper end of the upper connecting pipe 11 to which the first vertical pipe P1 is connected. The vertical bushing 21 includes a fitting portion 21a, a swirl vane 21b, and a swirl vane support leg 21c. The fitting portion 21a has a smaller diameter than the upper end of the vertical bushing 21 and is cylindrical so as to fit into the vertical pipe connecting portion 13 of the upper connecting pipe 11.

[0055] The swirl vanes 21b are supported by the swirl vane support legs 21c so that the projected area of ​​the swirl vanes 21b as viewed in the pipe axis direction is 5% to 30% of the internal cross-sectional area of ​​the first vertical pipe P1 and the inclination angle is 20° to 50°. The swirl vane support legs 21c extend substantially from the lower end of the fitting portion 21a with a width substantially the same as the horizontal width of the swirl vanes 21b, and the lower edge is inclined to follow the inclination of the swirl vanes 21b. The swirl vane support surface of the swirl vane support leg 21c is formed in an arc-shaped cross section and supports the swirl vanes 21b slightly above the lower edge. The swirl vane 21b is applied when high drainage performance is required depending on the size of the building and the number of drainage fixtures, so it may be omitted in buildings where high drainage performance is not required.

[0056] The vertical packing 22 is made of a rubber material typically used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM). The vertical packing 22 has a lip 22a at its upper end that is in watertight contact with the outer circumferential surface of the first vertical pipe P1, and is fitted into the vertical bush 21 so that its upper end surface is substantially flush with the upper end surface of the vertical bush 21. As shown in Fig. 2, the lip portion 22a is formed so that its diameter gradually decreases toward its lower end when the first vertical pipe P1 is not inserted. The upper end of the lip portion 22a has a diameter that is approximately the same as or slightly larger than the outer diameter of the first vertical pipe P1, and the lower end has a diameter that is smaller than the outer diameter of the first vertical pipe P1. A step 22b that protrudes radially inward is formed at the lower end of the lip portion 22a. The pipe end of the first vertical pipe P1 abuts against this step 22b, which absorbs thermal expansion and contraction of the first vertical pipe P1.

[0057] The vertical ring 23 is fitted onto the upper end of the vertical bush 21 and prevents the vertical packing 22 from coming off the vertical bush 21 by a flange portion 23a provided at one end. The vertical bushing 21 to the vertical ring 23 can be assembled and integrated in advance, and then the fitting portion 21a of the vertical bushing 21 can be fitted into the vertical pipe connecting portion 13 of the upper connecting pipe 11 and bonded.

[0058] A horizontal bushing 31, a horizontal packing 32, and a horizontal ring 33 are provided at the tip of the horizontal pipe connecting portion 14 that connects the horizontal pipe P3. One end of the horizontal bushing 31 is fitted and bonded to the horizontal pipe connecting portion 14 of the upper connecting pipe 11, and the other end is expanded in diameter.

[0059] The horizontal packing 32 is made of a rubber material typically used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM). The horizontal packing 32 is fitted onto the enlarged other end of the horizontal bushing 31, and is tightly fitted to the outer circumferential surface of the horizontal pipe P3 in a watertight manner.

[0060] The horizontal ring 33 is fitted onto the expanded diameter portion of the horizontal bush 31, and a flange portion 33a provided at one end prevents the horizontal packing 32 from coming off the vertical ring 23. In addition, the vertical bushing 21, vertical ring 23, horizontal bushing 31, and horizontal ring 33 are all obtained by injection molding a polyvinyl chloride resin composition containing 0.1 to 1.0 parts by weight of non-expandable graphite per 100 parts by weight of polyvinyl chloride resin.

[0061] "Installation of drainage manifold joint" The drainage manifold joint 10 as described above is used at the junction of horizontal branch pipes on each floor of the drainage riser of a multi-story building, as shown in FIG. 1, and is installed as follows. That is, the parts including the fitting connections of the lower connecting pipe 12, intermediate pipe 15, and upper connecting pipe 11 are installed facing the through-hole H in the floor slab S, and a second vertical pipe P2 on the lower floor (for example, a commercially available Eslon (registered trademark) fire-resistant VP pipe manufactured by Sekisui Chemical Co., Ltd.) is fitted and glued to the lower pipe part 18 of the lower connecting pipe 12. During this installation, the upper end of the lower connecting pipe 12 and the lower ends of the intermediate pipe 15 and upper connecting pipe 11 are housed inside the through-hole H. Also, the lower end of the first vertical pipe P1 on the upper floor is fitted into the vertical packing 22 via the vertical ring 23.

[0062] Next, the through holes H in the floor slab S are filled with a filler material (sound-proofing material) M such as mortar or rock wool, and the upper end of the lower connecting pipe 12 and the lower end of the intermediate pipe 15 and upper connecting pipe 11 are embedded in the filler material M. The upper end of the inclined pipe section 17 and the connecting pipe section 16 of the lower connecting pipe 12 are embedded in the filler material M. The portion of the upper connecting pipe 11 below the lower end of the horizontal pipe connecting section 14 (lower end 9) is embedded in the filler material M. It is preferable to use mortar as the filler material M, as it has excellent residue retention properties. Then, the end of the horizontal pipe P3 is inserted into the horizontal bushing 31 via the horizontal ring 33 and the horizontal packing 32 to connect the horizontal pipe P3.

[0063] The drainage manifold 10 of this embodiment has the installation structure described above, in which the intermediate pipe 15 is buried inside the through-hole H of the floor slab S while being surrounded by filler material M. In addition, the lower end 9 of the upper connecting pipe 11, the upper end of the inclined pipe section 17, and the connecting pipe section 16, which are located outside the intermediate pipe 15, are also buried inside the through-hole H of the floor slab S while being surrounded by filler material M. With this structure, if a fire breaks out on the floor below and the through-hole H and its surrounding area are heated by the flames, the thermally expandable graphite contained in the intermediate pipe 15 will expand. The expanded intermediate pipe 15 will then block the lower end of the upper connecting pipe 11 or the upper end of the lower connecting pipe 12. This will prevent flames and smoke from flowing from the floor below to the floor above, thereby preventing the spread of fire.

[0064] In addition, assuming that the lower connecting pipe 12 will melt down due to the heat during a fire, even if the lower connecting pipe 12 melts down, the intermediate pipe 15 will expand and close the through hole H, thereby exerting a fire spread prevention effect. Therefore, the through hole H can be reliably closed in the event of a fire, and a fire spread prevention effect is exerted.

[0065] In a structure equipped with the drainage manifold joint 10 shown in Fig. 1, an intermediate pipe 15 having a height of 30 mm or more and 150 mm or less can be reliably placed in the through-hole H, regardless of the thickness of the floor slab S, which may be any value between 150 and 300 mm. Therefore, the structure shown in Fig. 1 can be applied to floor slabs S of any thickness. Therefore, the structure of this embodiment can be widely applied to any building with a general slab thickness, and is highly versatile.

[0066] In the structure shown in Figure 1, a tapered inclined pipe section 17 is provided below the connecting pipe section 16, and this inclined pipe section 17 is securely held by the filler material M, so that the connecting pipe section 16 can be reliably prevented from falling even when heated by a flame or the like. 1, the connecting pipe portion 16 has a peripheral step 16a at its lower end, so that when the intermediate pipe 15 expands during a fire, the peripheral step 16a is securely caught on the filler material M. This prevents the lower connecting pipe 12 from burning down and falling, and the expansion of the intermediate pipe 15 reliably blocks the through hole H, ensuring fire resistance.

[0067] "Second embodiment" FIG. 4 is a cross-sectional view showing an example of a joint structure in which a drainage collection joint according to a second embodiment of the present invention is applied to a fire-resistant structure. In this embodiment, an intermediate pipe 50 is provided that has a different structure from the intermediate pipe 15 used in the first embodiment. The intermediate pipe 50 of this embodiment is equivalent to the intermediate pipe 15 in terms of inner and outer diameter, height, thickness, shape, etc., but is made of a resin that does not contain thermally expandable graphite, such as a polyvinyl chloride resin. Alternatively, it is made of a polyvinyl chloride resin composition that contains 0.1 to 1.0 part by weight of non-expandable graphite per 100 parts by weight of polyvinyl chloride resin.

[0068] This embodiment is characterized in that a fire-resistant layer 51 made of a heat-expandable fire-resistant material such as heat-expandable graphite is provided on the outer periphery of the lower end 9 of the upper connecting pipe 11 located outside the intermediate pipe 50 and on the outer periphery of the connecting pipe portion 16 located outside the intermediate pipe 50. The fire-resistant layer 51 can have a structure formed by wrapping a heat-expandable fire-resistant sheet or tape containing heat-expandable graphite.

[0069] The fire-resistant layer 51 is made of the same material as that of the intermediate pipe 15 of the first embodiment. That is, the entire structure may be a single layer made of a resin composition containing a heat-expandable fire-resistant material, or a multi-layer structure made of multiple layers including a sound-insulating layer, a sound-absorbing layer, etc. In the case of a multi-layer structure, it is sufficient that any one of the layers is formed from a resin composition containing a heat-expandable fire-resistant material. For example, a portion of the sound-insulating layer or sound-absorbing layer covering the outer periphery of the upper connecting pipe 11 or the lower connecting pipe 12 may be formed from a resin composition containing a heat-expandable fire-resistant material and function as a fire-resistant layer. Alternatively, the fire-resistant layer may be a multi-layer structure formed by wrapping a single-layer fire-resistant sheet made of a resin composition containing a heat-expandable fire-resistant material. Among these, a structure wrapped with a fire-resistant sheet is preferable because it is easy to implement at the construction site. In addition, if the intermediate pipe 50 does not contain thermally expandable graphite, a sheet-like fire-resistant material containing thermally expandable graphite may be wrapped around the outer surface of the intermediate pipe 50 or the outer surface of the sound-insulating material covering the intermediate pipe 50, and the fire-resistant material may be embedded in the slab penetration portion.

[0070] The fire-resistant layer 51 of this embodiment is formed to have the same height as the intermediate pipe 15 of the previous example. That is, the fire-resistant layer 51 is formed to have a height of 30 mm or more and 150 mm or less. The other structures are the same as those of the first embodiment, and therefore a description of the other structures will be omitted.

[0071] When the structure of the second embodiment is applied to the floor slab S having the structure shown in Fig. 1, a fire-resistant layer 51 is embedded inside the through-hole H. Even when heated during a fire, the intermediate pipe 50 does not expand, but the thermally expandable graphite contained in the fire-resistant layer 51 does expand. When a fire occurs, the fire-resistant layer 51 is heated and expands to crush the lower end 9 of the upper connecting pipe 11, the connecting pipe part 16, and the intermediate pipe 15, which have been softened by the heat, and closes the through-hole H. As a result, flames and smoke from a fire that has broken out on a lower floor are not transmitted to the upper floor through the through-hole H, thereby achieving fire resistance.

[0072] Modifications of this embodiment include, for example, a first modification shown in Fig. 5 and a second modification shown in Fig. 6. In both of these modifications, there is no intermediate pipe 50, and the upper connecting pipe 11 and the lower connecting pipe 12 are directly connected (without the intermediate pipe 50). 5, the lower end 9 of the upper connecting pipe 11 is a spigot, and the upper end (connecting pipe portion 16) of the lower connecting pipe 12 is a socket. The lower end 9 of the upper connecting pipe 11 is fitted into the upper end of the lower connecting pipe 12. 6, the lower end 9 of the upper connecting pipe 11 is a socket, and the upper end (connecting pipe portion 16) of the lower connecting pipe 12 is a spigot. The upper end of the lower connecting pipe 12 is fitted into the lower end 9 of the upper connecting pipe 11. In both of these modified examples, a fire-resistant layer 51 containing a heat-expandable fire-resistant material is provided around (on the outer periphery of) the connecting portion where the upper connecting pipe 11 and the lower connecting pipe 12 are connected. The connecting portion can also be considered to be the fitting portion where the upper connecting pipe 11 and the lower connecting pipe 12 are fitted together. The fire-resistant layer 51 can have a configuration similar to that of the second embodiment. For example, the height of the fire-resistant layer 51 is 150 mm or less. Furthermore, the inner diameter of the lower end portion 9 of the upper connecting pipe 11 in FIG. 5 and the upper end portion (connecting pipe portion 16) of the lower connecting pipe 12 in FIG. 6, like the inner diameter of the intermediate pipe 15, is preferably larger than the inner diameter of the vertical pipe P1, more preferably 100 mm or more and 200 mm or less, even more preferably 110 mm or more and 175 mm or less, and most preferably 120 mm or more and 150 mm or less. Furthermore, a fireproof layer 51 is installed on the outer periphery of the lower end 9 of the upper connecting pipe 11 in Fig. 5 and the connecting pipe portion 16 of the lower connecting pipe 12 in Fig. 6. Therefore, by making the height of the lower end 9 or the connecting pipe portion 16 equal to or less than the slab thickness, the fireproof layer 51 can be reliably installed inside the through hole H. For example, the height of the lower end 9 or the connecting pipe portion 16 is 300 mm or less, and preferably 150 mm or less. In both of these modified examples, the intermediate tube 50 is not required, and the number of parts can be reduced.

[0073] Here, in any of the second embodiment shown in FIG. 4, the first modified example shown in FIG. 5, and the second modified example shown in FIG. 6, it is preferable that the fire-resistant layer 51 is provided around (on the outer periphery of) the part shown in (1) or (2) below. (1) The portion where the upper connecting pipe 11, the lower connecting pipe 12, and the intermediate pipe 50 are not connected to each other, in other words, the portion formed by a single pipe material. (2) The portions where two pipes overlap, such as the connection between the upper connecting pipe 11 and the intermediate pipe 50, the connection between the intermediate pipe 50 and the lower connecting pipe 12, and the connection between the upper connecting pipe 11 and the lower connecting pipe 12.

[0074] For example, when three pipes, i.e., the upper connecting pipe 11, the intermediate pipe 50, and the lower connecting pipe 12, are overlapping, it is not preferable to provide the fire-resistant layer 51 around (the outer periphery of) the overlapping portion of three or more pipes. This is because the more pipes overlap, the more rigid the joint between the pipes becomes and the less likely the joint is to deform. Therefore, the joint is less likely to deform when the fire-resistant layer 51 expands, and as a result, the joint is less likely to become clogged. Therefore, providing the fire-resistant layer 51 around the portion shown in (1) above rather than around the portion shown in (2) above in Figures 5 and 6 makes it easier for the expansion of the fire-resistant layer 51 to clog the drainage manifold 10. Note that, as long as the height of the fire-resistant layer 51 is 150 mm or less, it may be provided around both the portion shown in (1) above and the portion shown in (2).

[0075] From the same viewpoint, even in the case of (1) or (2) above, it is preferable that no protrusions (ribs), such as the damming plate 13a or the swirl vane 21b, are provided on the inner surface of the portion wrapped with the fire-resistant layer 51. In other words, if such protrusions are provided, the rigidity of the pipe material increases and the pipe material becomes less likely to deform, so that the pipe material is less likely to be blocked when the fire-resistant layer 51 expands.

[0076] In the structures of the first and second embodiments and their modifications, sound-insulating covers may be provided around the outer periphery of the upper connecting pipe 11 and the outer periphery of the lower connecting pipe 12 as a measure to block out noise such as drainage noise. The sound-insulating cover may be wrapped around the lower connecting pipe 12 before delivery to the site (at the time of shipment from the factory), or the sound-insulating cover may be wrapped around the pipe after installation on site. The soundproof cover can be a sheet made of soft vinyl chloride, butyl rubber, or PP (polypropylene) with a thickness of about 0.8 to 2 mm. Alternatively, a laminated soundproof cover can be used, with polyester fiber, urethane foam, or glass wool with a thickness of about 5 to 20 mm layered on the inside of the sheet.

[0077] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. In addition, within the scope of the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of symbols]

[0078] 1...Fire-resistant structure of drainage collection joint, 10...Drainage collection joint, 11...Upper connecting pipe, 12...Lower connecting pipe, 13...Vertical pipe connection part, 15...Intermediate tube, 16...connecting pipe section, 17... Inclined pipe section, 21b...swirl vane, 50...Intermediate tube, 51...Fireproof layer, H...Through hole, M...soundproofing material (mortar), S...Floor slab.

Claims

1. A fire-resistant structure comprising a floor provided between an upper floor and a lower floor and having through holes formed therein, and a joint disposed in the through holes, The aforementioned joint comprises a resin upper connecting pipe having a horizontal pipe connection section on its side and a swivel vane and a damming plate on its inner surface, and a resin lower connecting pipe connected to this upper connecting pipe. The lower end of the upper connecting pipe and the upper end of the lower connecting pipe are positioned within the through hole. A connecting pipe section is formed at the upper end of the lower connecting pipe to connect the lower end of the upper connecting pipe, and a tapering inclined pipe section is formed below the connecting pipe section, The lower end of the upper connecting pipe, the connecting pipe section, and the upper part of the inclined pipe section are positioned within the through hole. A fire-resistant layer containing a heat-expandable fire-resistant material is provided on the outer circumference between the lower end of the horizontal pipe connection and the upper end of the inclined pipe section, below the lower end of the swivel vane and the lower end of the damming plate (except in cases where the fire-resistant layer is provided on the outer circumference of the portion where the upper connecting pipe and the lower connecting pipe are connected and overlap each other). The height of the fire-resistant layer is 150 mm or less. Rock wool is filled between the through hole and the outer surface of the joint. Fireproof construction.

2. A fire-resistant structure comprising a floor provided between an upper floor and a lower floor and having through holes formed therein, and a joint disposed in the through holes, The aforementioned joint comprises a resin upper connecting pipe having a horizontal pipe connection section on its side and a swivel vane and a damming plate on its inner surface, and a resin lower connecting pipe connected to this upper connecting pipe. The lower end of the upper connecting pipe and the upper end of the lower connecting pipe are positioned within the through hole. A connecting pipe section is formed at the upper end of the lower connecting pipe to connect the lower end of the upper connecting pipe, and a tapering inclined pipe section is formed below the connecting pipe section, The lower end of the upper connecting pipe, the connecting pipe section, and the upper part of the inclined pipe section are positioned within the through hole. A fire-resistant layer containing a heat-expandable fire-resistant material is provided on the outer circumference between the lower end of the horizontal pipe connection and the upper end of the inclined pipe section. The fire-resistant layer is provided on the outer circumference between the lower end of the horizontal pipe connection and the lower end of the upper connecting pipe (except in cases where the inner surface between the lower end of the horizontal pipe connection and the lower end of the upper connecting pipe is provided with projections including the swivel vane and the damming plate), The height of the fire-resistant layer is 150 mm or less. Rock wool is filled between the through hole and the outer surface of the joint. Fireproof construction.

3. A fire-resistant structure comprising a floor provided between an upper floor and a lower floor and having through holes formed therein, and a joint disposed in the through holes, The aforementioned joint comprises a resin upper connecting pipe having a horizontal pipe connection portion on its side and a swivel vane on its inner surface, a resin lower connecting pipe connected to the upper connecting pipe, and an intermediate pipe provided between the upper connecting pipe and the lower connecting pipe and below the lower end of the swivel vane, The lower end of the upper connecting pipe and the upper end of the intermediate pipe are positioned within the through hole. A connecting pipe section is formed at the upper end of the lower connecting pipe to connect the lower end of the intermediate pipe, and a tapering inclined pipe section is formed below the connecting pipe section, The lower end of the upper connecting pipe and the upper part of the intermediate pipe are positioned within the through hole. A fire-resistant layer containing a thermally expandable fire-resistant material is provided on the outer circumference of the intermediate pipe, in the portion where the upper connecting pipe, the lower connecting pipe, and the intermediate pipe are not connected to each other. The height of the fire-resistant layer is 150 mm or less. The aforementioned connecting pipe section is a socket or a receptacle. Rock wool is filled between the through hole and the outer surface of the joint. Fireproof construction.

4. The fire-resistant structure according to any one of claims 1 to 3, wherein the lower connecting pipe has a sound-insulating cover wrapped around its outer circumference in advance.

5. The fire-resistant structure according to claim 3, wherein a sound-insulating material is provided on the outer circumference of the intermediate pipe, and a sheet-like fire-resistant material containing thermally expandable graphite is provided on the outer circumference of the sound-insulating material.

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