Drain piping structure

Abstract

To provide a resin joint capable of exhibiting an optimal fire spread prevention effect (attaining an intended fire resistant structure) even in a thin slab.SOLUTION: A resin joint 100 includes: a resin upper member 140 that has one or more branch pipes and projects to the upper side of a thin slab; a resin lower member 110 that is connected to the lower side of the upper member 140 and in which an upper part is embedded in the thin slab and a lower part projects to the lower side of the thin slab when the resin joint 100 is constructed on the thin slab; and a thermal expansion material. In the thermal expansion material, an upper thermal expansion material 711 and a lower thermal expansion material 712 are provided to vertically separate from each other on upper and lower two portions of an outer surface of the resin joint 100. The lower member 110 has a diameter contraction part 118 on the lower side, and the upper thermal expansion material 711 and the lower thermal expansion material 712 are provided on the upper side of the diameter contraction part 118. At least one of the upper thermal expansion material 711 and the lower thermal expansion material 712 is located at a position of the thin slab in an expandable manner.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a resin joint that is installed through the floor slab of a building, and in particular to a resin joint that can exhibit optimal fire spread prevention effects (can achieve the desired fire-resistant structure) even if the floor slab is a thin slab. [Background technology]

[0002] Water supply and drainage systems are installed in apartment buildings, office buildings, etc. The most widely known drainage system is a drainage piping structure that includes vertical pipes (upper standpipes, lower standpipes) that run vertically through each floor of the building, horizontal pipes (horizontal branch pipes, branch pipes) installed within each floor, and drainage pipe fittings that connect these. When installed in a building, such a drainage pipe joint includes a pipe body that is placed in the through-hole in the floor slab, an upper riser pipe connection that protrudes above the floor slab and connects to a drainage standpipe that allows drainage water from the upper floor to flow in, a lower riser pipe connection that protrudes below the floor slab and connects to a drainage standpipe that allows drainage water to flow down to the floor below, and a horizontal branch pipe connection that connects to a horizontal drainage branch pipe above the floor slab. Furthermore, many of the pipe bodies include components that change the flow of drainage water within the drainage pipe joint (e.g., swirl vanes, straightening vanes, deflector plates, etc.). Such drainage pipe joints are widely known to be made from one or more injection-molded resin products.

[0003] In buildings equipped with drainage piping structures using such drainage pipe joints, in the event of a fire or other incident on a floor below, in order to prevent flames, soot, and toxic gases from leaking to upper floors through burned or melted parts of the drainage piping structure, heat-expandable fire-resistant material is attached to the drainage pipe joints separately around the periphery of the piping material or buried within the wall of the piping material, and in the event of a fire, the through holes in the floor slab are kept blocked by this heat-expandable fire-resistant material.

[0004] As one such technique, Japanese Patent Laid-Open No. 2019-049167 (Patent Document 1) discloses a joint that can effectively block smoke and flames generated below. The joint disclosed in this Patent Document 1 is a joint configured to be able to be inserted into a floor slab, and is provided with a plurality of branch pipes. The joint includes an upper member that protrudes above the floor slab when the joint is inserted into the floor slab, a lower member that is connected to the upper member and has an upper portion embedded inside the floor slab and a lower portion protruding below the floor slab when the joint is inserted into the floor slab, a straightening vane housed in the upper portion of the lower member, and a thermal expansion material provided on the peripheral wall of the lower member, When the joint is inserted into the floor slab, the upper end of the thermal expansion material is positioned lower than the upper end surface of the floor slab, and the lower end of the thermal expansion material is positioned lower than the upper end of the straightening vane (Claim 1 of Patent Document 1), and preferably, the width of the thermal expansion material in the height direction is 30 mm to 60 mm, and the lower end of the thermal expansion material is positioned between a height of 30 mm and a height of 100 mm below the upper end surface of the floor slab (Claim 2 of Patent Document 1). According to the above-mentioned configuration, the relative positions of the thermal expansion material and the straightening vane are appropriate under the general condition that the thickness of the floor slab is 100 mm or more, so that the fire resistance of the joint is exhibited (Patent Document 1, paragraph 0013). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2019-049167 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the joint disclosed in Patent Document 1 is suitable for floor slabs with a thickness of 10 mm, as described above. The fire resistance of the joints is only demonstrated under the general condition of a height of 100 mm or more. However, for the purposes of reducing floor weight, increasing load capacity, simplifying construction, and shortening construction time, deck slabs, in which thick and thin slabs of different thicknesses are repeated at a predetermined pitch to form a flat top surface, are increasingly being used as floor slabs in steel-framed buildings. In such cases, the thickness of the thin slabs is often less than 100 mm. Furthermore, when a thin slab consisting only of the thin slab portion of such a deck slab is used as a floor slab, the thickness of the floor slab becomes thinner than the general condition. Furthermore, even if the floor slab thickness meets the general condition, the upper member protruding above the floor slab may be installed as a floating piping (rather than a rolling piping as in Patent Document 1). As such, when the floor slab is thinner than the general condition and the upper member is installed as a floating piping, the joints disclosed in Patent Document 1 may not fully demonstrate their fire resistance.

[0007] The present invention was developed in consideration of the above-mentioned problems, and its purpose is to provide a resin joint that can achieve optimal fire spread prevention even when the floor slab is a thin slab that is thinner than usual. [Means for solving the problem]

[0008] In order to achieve the above object, the resin joint according to the present invention employs the following technical means. In other words, the plastic joint of the present invention is a plastic joint that can be installed on a thin slab having a thickness within a predetermined range, and is equipped with one or more branch pipes, and includes: a plastic upper member that protrudes above the thin slab when the plastic joint is installed on the thin slab; a plastic lower member that is connected to the underside of the upper member and has an upper part that is embedded in the thin slab and a lower part that protrudes below the thin slab when the plastic joint is installed on the thin slab; and a thermal expansion material, wherein the thermal expansion material is provided at two locations, above and below, on the outer surface of the plastic joint, with the upper thermal expansion material and the lower thermal expansion material being spaced apart in the vertical direction, the lower member has a reduced diameter portion on the underside, the upper thermal expansion material and the lower thermal expansion material are provided above the reduced diameter portion, and at least one of the upper thermal expansion material and the lower thermal expansion material is present and expandable at the position of the thin slab.

[0009] Preferably, the predetermined range can be configured to be less than 150 mm. More preferably, the volume of the thermal expansion material provided at the two upper and lower locations can be configured so that the upper thermal expansion material is smaller than the lower thermal expansion material. More preferably, the volume of the lower thermal expansion material is 72 cm 3 Over 145cm 3 or less, and the volume of the upper thermal expansion material is 72 cm 3 It can be configured to be less than More preferably, the thermal expansion materials provided at the two upper and lower locations can be configured to be spaced apart by 30 mm or more.

[0010] More preferably, the upper end of the lower thermal expansion material can be configured to be positioned within 80 mm from the upper surface of the thin slab. More preferably, the reduced diameter section is provided with a swirl vane, and the upper end of the lower thermal expansion material is located below the upper surface of the thin-walled slab and above the lower end of the swirl vane, the lower end of the lower thermal expansion material is located below the upper end of the swirl vane and above the lower end of the swirl vane, and the upper thermal expansion material is located above the upper end of the swirl vane.

[0011] More preferably, when the upper end of the lower thermal expansion material is located below the lower surface of the thin slab, the upper thermal expansion material can be configured to have a portion that overlaps with the thin slab in the vertical direction. More preferably, the lower end of the upper thermal expansion material is located above the upper surface of the thin slab. In this case, the lower thermal expansion material may be configured to have a portion that overlaps with the thin slab in the vertical direction. More preferably, the resin joint can be configured to have outer layer members, in this order, a non-flammable vibration insulator and a sound insulating cover. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a resin joint that can exhibit an optimal fire spread prevention effect even when the floor slab is a thin slab that is thinner than the general conditions. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram for explaining a deck slab, which is an example of a floor slab to which a resin joint 100 according to an embodiment of the present invention is applied. [Figure 2] 1A is an exploded view of a resin joint 100 according to an embodiment of the invention, and FIG. 1B is a perspective view of a lower member 110 seen through a pipe wall. [Figure 3] FIG. 1 is a half cross-sectional view showing a drainage piping structure in which a resin joint 100 is installed using rolling piping. [Figure 4] 1 is a half cross-sectional view showing a drainage piping structure in which a resin joint 100 is installed as a floating piping (floating amount HL: large). [Figure 5] 1 is a half cross-sectional view showing a drainage piping structure in which a resin joint 100 is installed as a floating piping (floating amount HS: small). [Figure 6] FIG. 3 is a half cross-sectional view showing a case where the thermal expansion materials are provided continuously at the upper two locations in the resin joint 100. [Figure 7] This is a half-sectional view showing a drainage piping structure in which the drainage piping joint 100 (in this application, a resin joint 200) disclosed in Patent Publication No. 2021-167507 filed by the applicant of the present application is installed using rolling piping. DETAILED DESCRIPTION OF THE INVENTION

[0014] A resin joint 100 according to an embodiment of the present invention will be described in detail below with reference to Figures 2 to 6. In the following description, the resin joint 100 will be described as being installed on the deck slab DS shown in Figure 1, but the resin joint according to the present invention is also preferably applied to a thin slab consisting only of the thin slab portion of the deck slab DS (the portion indicated by thickness t(2) in Figure 1).

[0015] The perspective view shown in Fig. 2 is a schematic view, and may not be completely consistent with other views. In the following description, the outer peripheral surface, the outer surface, the outside, the outer layer side, the outer peripheral side, the outside, the inner layer side, the inner peripheral side, and the inside, and the thermally expandable material and the thermally expandable fireproof material may not be clearly distinguished. In the cross-sectional view, different components may not be clearly distinguished by the type of hatching.

[0016] <Items common to the conventional resin joint 200 and related to the present invention> The present invention is based on a drainage pipe joint 100 (referred to as a resin joint 200 in this application) disclosed in Japanese Patent Application Laid-Open No. 2021-167507 filed by the applicant as a joint capable of effectively blocking smoke and flames generated below. Fig. 7 shows a half cross-sectional view of a drainage pipe structure in which this resin joint 200 is installed using rolling piping. Components in Fig. 7 that have the same structure as the components in the other Figs. 2 to 6 are assigned the same reference numerals and have the same functions. For this reason, matters that are not closely related to the present invention and are described in Japanese Patent Application Laid-Open No. 2021-167507 may not be described below.

[0017] On the other hand, matters related to the present invention and described in JP 2021-167507 A will be replaced with the present invention and first described below. As shown in Figures 2 to 7, these plastic joints 100 and 200 (hereinafter sometimes referred to as plastic joints 100, 200) have one or more branch pipes and include a plastic upper member 140 that protrudes above the thin slab when the plastic joints 100, 200 are installed on the thin slab, a plastic lower member 110 that is connected to the underside of the upper member 140 and has an upper part embedded in the thin slab and a lower part that protrudes below the thin slab when the plastic joints 100, 200 are installed on the thin slab, and a thermal expansion material (except for the thermally expandable fire-resistant material 612, the plastic joint 200 shown in Figure 7 has a thermal expansion material 712 that corresponds to the lower thermal expansion material 712 of the present invention, but does not have the upper thermal expansion material 711 or integrated thermal expansion material 713 of the present invention).

[0018] The resin fitting 100 and the drain pipe connected to the resin fitting 100 are made of a non-fire-resistant resin. Here, "non-fire-resistant" refers to a property that allows deformation, melting, or combustion due to heat generated when a fire breaks out in a building, and this applies to resin, for example. When a resin is used, the resin fitting 100 and the piping connected thereto (upstream upper standpipe, horizontal branch pipe, downstream lower standpipe) are molded from, for example, polyvinyl chloride, polyethylene, polybutene, polypropylene, nylon, or the like. The standpipe may be, for example, a so-called two-layer fire-resistant pipe or a resin pipe made by molding a resin composition containing a heat-expandable fire-resistant material.

[0019] In these plastic joints 100, 200, an upper member 140 has an upper riser connecting portion at the upper end thereof provided with an upper riser socket 120 for connecting an upstream upper riser, and a side branch connecting portion at the side end of the upper member 140 has a first branch socket 144, a second branch socket 146, and a third branch socket 148 for connecting one or more side branch pipes (here, three side branch pipes). The lower member 110 has a straight pipe section 116 on the upper member 140 side and a reduced diameter section 118 continuous with the straight pipe section 116, and the downstream down riser 130 is connected to the down riser connecting portion at the lower end of the reduced diameter section 118. The central space of the upper member 140 forms a water collection chamber 142. The plastic joint 100 has a swirl vane 114 in the reduced diameter section 118 of the lower member 110. In order to form the swirl vane 114 so as to protrude on the inner circumferential side of the reduced diameter portion 118, a recess 112 exists on the outer circumferential side of the reduced diameter portion 118.

[0020] In these resin joints 100, 200, an outer layer member 700 is provided so as to be wrapped around the outer periphery of the upper member 140 below the branch pipe receptacle and the outer periphery of the lower member 110. This outer layer member 700 has a three-layer structure, and is provided, in this order from the outer surface of the resin joint 100, 200, with a vibration-damping material 714 (or a thermally expandable fire-resistant sheet (as the lower thermal expansion material 712 of the present application), a vibration insulator 720 formed from fire-resistant inorganic fiber (having non-combustible properties), and a sound-insulating cover 730. Note that with regard to this outer layer member 700, the vibration insulator 720 (excluding the vibration-damping material 714), the sound-insulating cover 730, and the thermal expansion material (the upper thermal expansion material 711 and lower thermal expansion material 712 of the present application, or the integrated thermal expansion material 713) are essential components in the resin joint of the present invention.

[0021] In the resin joints 100 and 200, the vibration-damping material 714 is attached to the outer surface of the lower member 110 (over the entire surface, for example with an adhesive or pressure-sensitive adhesive) so as to cover the heat-expandable fire-resistant material 612 filled in the recess 112. With regard to fire resistance, a heat-expandable fire-resistant sheet (as the lower thermal expansion material 712 of the present application) is attached to the outer surface of the lower member 110 in place of the vibration-damping material 714 at a position on the lower member 110 above the portion of the recess 112 filled with the heat-expandable fire-resistant material 612. The heat-expandable fire-resistant sheet (as the lower thermal expansion material 712 of the present application) attached to the outer surface of the lower member 110 in this manner also exhibits vibration-damping performance similar to the vibration-damping material 714 (although the performance may not be equivalent).

[0022] In this way, the innermost layer 710 in this three-layer structure is and a lower thermal expansion material 712, or an integrated thermal expansion material 713) and a thermal expansion fireproof sheet (not necessarily in sheet form) and a vibration damping material 714. The vibration-damping material 714 is formed containing a butyl-based material (butyl rubber, etc.) or an asphalt-based material (rubber asphalt, modified asphalt, etc.), the sound-insulating cover 730 is formed containing a rubber-based material (EPDM (ethylene propylene diene rubber), etc.), an elastomer-based material, or an olefin-based material (polyethylene resin, etc.), and the vibration insulator 720 formed from fire-resistant inorganic fibers consists of an aggregate (porous material) of fire-resistant inorganic fibers.

[0023] Here, examples of inorganic fibers include artificial mineral fibers, such as glass wool, rock wool, or ceramic fiber, which are preferred for their high vibration insulation and sound absorption properties. Vibrations caused by wastewater flowing down the resin joints 100, 200 (e.g., vibrations generated by hitting the swirl vanes 114) are suppressed by the vibration-damping material 714, and then vibration is blocked (and / or noise associated with the vibration is absorbed) by the vibration insulator 720 made of rock wool or the like, and further, transmission of the noise associated with the vibration is blocked by the sound-insulating cover 730 made of a rubber cover such as EPDM. Here, rock wool is a general term for materials made primarily from natural rock or steel slag such as blast furnace slag, while glass wool is a general term for cotton-like materials composed of glass fiber. Both are fire-resistant and flame-resistant. In the following, we may explain the case where butyl rubber is used as the vibration damping material 714, rock wool is used as the vibration insulator 720, and an EPDM rubber cover is used as the sound-insulating cover 730, but these materials are merely examples.

[0024] <Floor slab to which the resin joint 100 is applied> Next, with reference to Figure 1, a deck slab DS, which is a floor slab on which the resin joint 100 is installed, will be described. As shown in the external perspective view of the deck slab DS (Figure 1(D)), this deck slab DS has thick slabs (portions indicated by thickness t(1) in Figure 1) and thin slabs (portions indicated by thickness t(2) in Figure 1) of different thicknesses repeated at a predetermined pitch, and the upper surface is formed as a flat surface. Note that Figure 1(D) depicts a through hole 24 into which the resin joint 100 is inserted, and the gap between the resin joint 100 and the through hole 24 is filled with mortar or the like, and the resin joint 100 is installed by being embedded in the deck slab DS.

[0025] The outer diameter of the resin joint 100 is larger than the pitch at which thick slabs and thin slabs are repeated in the deck slab DS, and one resin joint 100 is installed across the thick slabs and thin slabs. In other words, the resin joint 100 cannot be installed only in the thick slab portion of the deck slab DS, and the resin joint 100 is always installed including the thin slab portion. As mentioned above, the resin joint 100 is also preferably applied to a thin slab that is composed only of the thin slab portion of the deck slab DS, rather than the deck slab DS.

[0026] As shown in Figure 1(A), this deck slab DS is an example and is composed of steel frame material (H-shaped steel in this case) 10, a metal sheet 12 with a cross-sectional shape that has repeated concaves and convexes and is provided on the steel frame material 10, reinforcing bars 14 provided on the metal sheet 12, and concrete 16 poured on the metal sheet 12 including the reinforcing bars 14. Note that, although not limited to this, in this embodiment, the thickness t(2) of the thin slab portion is 75 mm or more, and the thickness t(1) of the thick slab portion is 150 mm or more (the additional thickness of the thick slab is t(1) - t(2) = 75 mm).

[0027] In order to install the resin joint 100 on such a deck slab DS, it is necessary to perform a process to provide a through hole 24 before pouring the concrete 16. For this reason, as shown in FIG. 1(B), the metal sheet 12 and the reinforcing bar 14 present in the region 20 are cut into a circular shape. As shown in Figure 1(C), before pouring concrete, a circular pipe 22 called a sleeve (also called a void) is installed and fixed perpendicular to the floor surface, and concrete is poured around the sleeve to create a concrete floor (floor slab) and cured, completing the deck slab DS with through holes 24 as shown in Figure 1(D). The gap between the resin joint 100 and the through hole 24 is filled with mortar or the like, and the resin joint 100 is constructed by being embedded in the deck slab DS, although this mortar or the like is not shown in Figures 3 to 7.

[0028] <Resin joint 100> As shown in Figures 2 to 6, the resin joint 100 according to this embodiment is a resin joint that can be installed on a thin slab having a predetermined thickness (a floor slab formed only with a thin slab having a thickness t(2) of the deck slab DS shown in Figure 1 and without a thick slab having a thickness t(1)). This resin joint 100 includes one or more branch pipes and includes a resin upper member 140 that protrudes above the thin slab when the resin joint 100 is installed on the thin slab, a resin lower member 110 connected to the underside of the upper member 140, and an upper portion embedded in the thin slab and a lower portion protruding below the thin slab when the resin joint 100 is installed on the thin slab, and a thermal expansion material. The thermal expansion materials are provided at two locations, upper and lower, on the outer surface of the resin joint 100: an upper thermal expansion material 711 and a lower thermal expansion material 712, spaced apart in the vertical direction. The lower member 110 has a reduced diameter portion 118 on its lower side. The upper thermal expansion material 711 and the lower thermal expansion material 712 are provided above the reduced diameter portion 118, and at least one of the upper thermal expansion material 711 and the lower thermal expansion material 712 is expandable at the position of the thin slab. Note that the "position of the thin slab" is as shown in Figures 1 and 3.

[0029] More specifically, as shown in FIG. 3, in the drainage pipe structure in which the resin joint 100 is installed in a rolling pipe, only the upper thermal expansion material 711 can expand at the position of the thin slab. As shown in FIG. 4, in the drainage pipe structure in which the resin joint 100 is installed in a floating pipe (floating amount HL: large, HL>HS), only the lower thermal expansion material 712 can expand at the position of the thin slab. As shown in FIG. 5, in the drainage pipe structure in which the resin joint 100 is installed in a floating pipe (floating amount HS: small, HS<HL), both the upper thermal expansion material 711 and the lower thermal expansion material 712 can expand at the position of the thin slab.

[0030] On the other hand, the resin joint 200 (conventional) shown in FIG. 7 does not include the upper thermal expansion material 711. Therefore, as shown in FIG. 7, in the drainage pipe structure in which the resin joint 200 is installed in a rolling pipe, there is no thermal expansion material that can expand at the position of the thin slab, and the thermal expansion material corresponding to the lower thermal expansion material 712 has completely protruded from the lower surface of the thin slab. For this reason, the rock wool (rock wool as the vibration insulator 720 formed of a fireproof inorganic fiber having non-combustible performance) that catches the expanded thermal expansion material (here, the thermal expansion material corresponding to the lower thermal expansion material 712 and the paste-like thermally expandable refractory 612) so as not to fall off is in a state where it is likely to fall off, and a desired fireproof structure cannot be realized.

[0031] On the other hand, since the upper thermal expansion material 711 included in the resin joint 100 according to the present embodiment can expand at the position of the thin slab, a force that stretches outward in the buried portion (a force that sandwiches the rock wool between the thin slab wall surface and the thermal expansion material) acts, making it possible to prevent the rock wool from falling off, and suppressing the state in which the rock wool that catches the expanded thermal expansion material (the lower thermal expansion material 712 and the paste-like thermally expandable refractory 612) so as not to fall off is likely to fall off. Therefore, a desired fireproof structure can be realized.

[0032] Here, in addition to the upper thermal expansion material 711 and the lower thermal expansion material 712, the resin joint 100 also includes a putty-like thermal expansion fire-resistant material in a recess 112 on the outer periphery for forming the swirl vane 114 provided so as to protrude from the inner periphery of the reduced diameter portion 118 of the lower member 110 as the thermal expansion material. However, this putty-like heat-expandable fire-resistant material 612 is not an essential component of the present invention. The putty-like heat-expandable fire-resistant material 612 filled in the recess 112 also exhibits vibration-damping and sound-insulating properties.

[0033] The predetermined range for the thickness t(2) of the thin slab is less than 150 mm. As described above, although not limited thereto, in this embodiment, t(2) is set to 75 mm or more. Therefore, the thickness t(2) of the thin slab (here, the deck slab DS shown in FIG. 1) is, by way of example, 75 mm or more and less than 150 mm. Therefore, the thickness of the thin slab composed only of the thin slab portion of the deck slab DS (not the deck slab DS) to which the resin joint according to the present invention is preferably applied is 75 mm or more and less than 150 mm, and more preferably, the thickness of the thin slab is 75 mm or more and less than 100 mm.

[0034] The volume of the thermal expansion material provided at two locations, upper and lower, is such that the upper thermal expansion material 711 is smaller than the lower thermal expansion material 712, and in particular, the volume of the lower thermal expansion material 712 is 72 cm 3 Over 145cm 3 or less, and the volume of the upper thermal expansion material 711 is 72 cm 3 is less than. As shown in FIG. 3, in a drainage piping structure in which the plastic joint 100 is installed as a rolling pipe, only the upper thermal expansion material 711 is expandable at the thin slab, while the lower thermal expansion material 712 is completely exposed below the underside of the thin slab. Even in this state, as described above, the upper thermal expansion material 711 is expandable at the thin slab, which creates an outward tensioning force at the embedded portion (a force sandwiching the rock wool between the thin slab wall and the thermal expansion material), preventing the rock wool from falling out. Because the upper thermal expansion material 711 is intended to prevent the rock wool from falling out, its volume can be smaller than that of the lower thermal expansion material 712, which is intended to block the pipe. While it is possible to increase the amount (volume) of the upper thermal expansion material 711 so that it functions as a thermal expansion material for blocking the pipe, it is preferable that the upper thermal expansion material 711 be smaller in volume than the lower thermal expansion material 712.

[0035] The thermal expansion materials provided at two locations, upper and lower (upper thermal expansion material 711 and lower thermal expansion material 712) are spaced apart by 30 mm or more. When the thermal expansion material is divided into upper and lower parts, it is expected that they will often be placed in the upper member 140 and the lower member 110. In this case, if the upper thermal expansion material 711 and the lower thermal expansion material 712 are to be placed as close as possible, they will be placed at the top and bottom of the adhesive receptacle (shown in FIG. 3), so it is preferable that the adhesive margin be 30 mm or more.

[0036] The upper end of the lower thermal expansion member 712 is positioned within 80 mm from the upper surface of the thin slab. In this embodiment, the upper limit of the floating piping is set to within 80 mm (HL in Figure 4), and in conjunction with this, the upper end of the lower thermal expansion material 712 is positioned within 80 mm from the top surface of the thin slab. If it exceeds this 80 mm, the upper end of the lower thermal expansion material 712 (e.g., fire-resistant tape) will protrude above the top surface of the thin slab, reducing the amount of thermal expansion material embedded in the thin slab and resulting in poor fire resistance. To avoid this poor fire resistance, the distance between the upper end of the lower thermal expansion material 712 and the top surface of the thin slab is set to correspond to the upper limit of the floating piping.

[0037] The plastic joint 100 is provided with swirl vanes 114 in the reduced diameter section 118 of the lower member 110. As shown in Figure 3, the upper end of the lower thermal expansion material 712 is located below the upper surface of the thin slab and above the lower end of the swirl vanes 114, the lower end of the lower thermal expansion material 712 is located below the upper end of the swirl vanes 114 and above the lower end of the swirl vanes 114, and the upper thermal expansion material 711 is located above the upper end of the swirl vanes 114.

[0038] In such a position range, as shown in FIGS. 3 to 5, the upper thermal expansion material 711 and the lower thermal expansion material 71 At least one of the two can be inflatably present at the location of the thin slab, thereby achieving the desired fire-resistant structure. As shown in FIG. 3, when the upper end of the lower thermal expansion material 712 is located below the lower surface of the thin slab, the upper thermal expansion material 711 has a portion that overlaps with the thin slab in the vertical direction.

[0039] In the drainage piping structure shown in Figure 3, in which the plastic joint 100 is installed as a rolling pipe, the upper thermal expansion material 711 (only) has a portion that overlaps the thin slab in the vertical direction, allowing it to expand at the thin slab, while the lower thermal expansion material 712 is completely protruding from the underside of the thin slab. Even in this state, as described above, because the upper thermal expansion material 711 is expandable at the thin slab, an outward tensioning force (a force that sandwiches the rock wool between the thin slab wall surface and the thermal expansion material) acts at the embedded portion, preventing the rock wool from falling out. This prevents the rock wool, which holds the expanded thermal expansion material (the lower thermal expansion material 712 and the putty-like thermally expandable fire-resistant material 612) from falling out, from easily falling out, thereby achieving the desired fire-resistant structure.

[0040] As shown in FIG. 4, when the lower end of the upper thermal expansion material 711 is located above the upper surface of the thin slab, the lower thermal expansion material 712 has a portion that overlaps with the thin slab in the vertical direction. In the drainage piping structure shown in Figure 4, in which the resin joint 100 is installed as a floating piping (floating amount HL: large), the lower thermal expansion material 712 (only) has a portion that overlaps with the thin slab in the vertical direction, and is therefore able to expand at the position of the thin slab.The expanded lower thermal expansion material 712 itself blocks the pipe and prevents the rock wool from falling off, thereby achieving the desired fire-resistant structure.

[0041] As described above, this resin joint 100 comprises the outer layer member 700, which is made up of the non-flammable vibration insulator (rock wool) 720 and the sound insulating cover (EPDM rubber cover) 730 in this order. In this way, by providing non-flammable rock wool as an example of non-flammable vibration insulator 720, the thermal expansion material that is expandable at the thin slab position exerts a force that stretches it outward at the embedded part (a force that sandwiches the rock wool between the thin slab wall surface and the thermal expansion material), preventing the rock wool from falling off.

[0042] <Top and bottom integrated thermal expansion material> As described above, the resin joint 100 according to this embodiment is different from the drainage pipe joint 100 (referred to as the resin joint 200 in this application) disclosed in Japanese Patent Application Laid-Open Publication No. 2021-167507, on which the present invention is based. In addition to the lower thermal expansion material 712, an upper thermal expansion material 711 is provided separately from the lower thermal expansion material 712. When the resin joint 100 is installed on a deck slab DS, as described above, the outer diameter of the resin joint 100 is larger than the pitch at which thick and thin slabs are repeated in the deck slab DS. Therefore, one resin joint 100 is installed across the thick and thin slabs. In this case, as shown in FIG. 6, the resin joint 100 may be installed on the inclined surface S of the deck slab DS. Because the slab thickness on the inclined surface S changes continuously (because it is a variable-thickness slab), it is difficult to identify the position of the underside of the variable-thickness slab. Therefore, dividing the thermal expansion material into upper and lower parts may cause problems. More specifically, one example of this problem is when, depending on the slab thickness, floating piping height, etc., both the upper thermal expansion material 711 and the lower thermal expansion material 712 are not expandable at the position of the variable thickness slab of the deck slab DS, or when both the upper thermal expansion material 711 and the lower thermal expansion material 712 do not overlap with the variable thickness slab. Even in such cases, the integrated thermal expansion material 713 that is continuous in the vertical direction as shown in Figure 6 can be installed without causing such problems, and the desired fire-resistant structure can be achieved.

[0043] On the other hand, it is not the deck slab DS, but the thin slab part of the deck slab DS (thickness shown in Figure 1) When applying this to a thin slab consisting only of the part indicated by (2) above, there is no continuous change in the slab thickness, so it is preferable to divide it into upper and lower parts, as this has the disadvantages (1) to (3) shown below. In a drainage piping structure in which the thermal expansion material is not divided into upper and lower parts but an integrated thermal expansion material 713 as shown in Figure 6 is used and plastic joints 100 are rolled onto a thin slab for installation, (1) more thermal expansion material is required to make the amount of thermal expansion material embedded in the thin slab the same as in the upper and lower divided type, (2) because the thermal expansion material is installed on the side of the adhesive receptacle, the EPDM rubber cover acting as soundproof cover 730 expands to that extent, and (3) because of this (2), a larger through hole must be made in the thin slab, resulting in poor fit.

[0044] As described above, the resin joint 100 according to this embodiment can achieve the optimal fire spread prevention effect (achieve the desired fire-resistant structure) even if the floor slab is a thin-walled slab that is thinner than the general conditions. It should be noted that the embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Industrial Applicability]

[0045] The present invention is suitable for resin joints that are installed through the floor slabs of buildings, and is particularly suitable in that it can achieve optimal fire spread prevention effects even if the floor slab is a thin slab (it can achieve the desired fire-resistant structure). [Explanation of symbols]

[0046] 100, 200 Resin joints 110 Lower member 112 hollow 114 Swirling blades 120 Upper riser connection 130 Drain pipe connection 140 Upper member 142 Water Collection Chamber 144, 146, 148 Branch pipe socket 612 Thermally expandable fireproof material (putty type) 700 outer layer material 710 innermost layer 711 Upper thermal expansion material (sheet type) 712 Lower thermal expansion material (sheet type) 713 Integrated thermal expansion material (sheet type) 714 Damping material 720 Vibration insulator (made of fire-resistant inorganic fiber) 730 Soundproof Cover

Claims

1. A resin joint that can be installed on a thin slab having a thickness within a predetermined range, a resin upper member that includes one or more branch pipes and protrudes above the thin-walled slab when the resin joint is installed on the thin-walled slab; a resin lower member connected to the underside of the upper member, the upper portion of which is embedded in the thin-walled slab and the lower portion of which protrudes below the thin-walled slab when the resin joint is installed in the thin-walled slab; a thermal expansion material; The thermal expansion material is provided at two positions, upper and lower, on the outer surface of the resin joint, with an upper thermal expansion material and a lower thermal expansion material spaced apart in the vertical direction, the lower member has a reduced diameter portion on a lower side thereof, and the upper thermal expansion member and the lower thermal expansion member are provided above the reduced diameter portion; A plastic joint, characterized in that at least one of the upper thermal expansion material and the lower thermal expansion material is present in an expandable state at the position of the thin slab.

2. 2. The resin joint according to claim 1, wherein the predetermined range is less than 150 mm.

3. 2. The resin joint according to claim 1, wherein the volume of the upper thermal expansion material provided at the two upper and lower locations is smaller than that of the lower thermal expansion material.

4. The volume of the lower thermal expansion material is 72 cm 3 Over 145cm 3 or less, and the volume of the upper thermal expansion material is 72 cm 3 The resin joint according to claim 1, wherein the tensile strength is less than 1 / 2.

5. 2. The resin joint according to claim 1, wherein the thermal expansion materials provided at the two upper and lower locations are spaced apart by 30 mm or more.

6. 2. The resin joint according to claim 1, wherein the upper end of the lower thermal expansion material is positioned within 80 mm from the upper surface of the thin slab.

7. The reduced diameter portion is provided with a swirl vane, an upper end of the lower thermal expansion material is located below an upper surface of the thin slab and above a lower end of the swirl vane; a lower end of the lower thermal expansion member is located below an upper end of the swirl vane and above the lower end of the swirl vane; 2. The resin joint according to claim 1, wherein the upper thermal expansion material is located above an upper end of the swirl vane.

8. When the upper end of the lower thermal expansion material is located below the lower surface of the thin slab, The resin joint according to claim 1, wherein the upper thermal expansion material has a portion that overlaps with the thin slab in the vertical direction.

9. When the lower end of the upper thermal expansion material is above the upper surface of the thin slab, The resin joint according to claim 1, wherein the lower thermal expansion member has a portion that overlaps with the thin slab in the vertical direction.

10. The resin joint according to any one of claims 1 to 9, characterized in that the resin joint comprises outer layer members, in this order, a non-flammable vibration insulator and a sound insulating cover.

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