Fire prevention device and piping structure using the fire prevention device

Abstract

To prevent fire spreading of a synthetic resin pipe inserted into a through hole formed on a floor slab of a building and renew the synthetic resin pipe easily.SOLUTION: A fire spreading prevention device 1100 includes: a heat expansive fireproofing material 1110 provided below a floor slab S so as to contact with an outer periphery of a synthetic resin pipe 1500; an incombustible holding member 1120 which restrains an outer periphery of the heat expansive fireproofing material 1110. An engagement claw 1140 provided at an upper end of the holding member 1120 is swingably connected to a flange 1220 provided at a lower end of a sleeve 1200 fixedly provided at a through hole by mortar M. The synthetic resin pipe 1500 inserted into the through hole (more accurately, the sleeve 1200) is provided through a space SS (separated) from the sleeve 1200. Since the mortar M does not contact with the outer periphery of the synthetic resin pipe 1500, it is not necessary to break the mortar M when the synthetic resin pipe 1500 is renewed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fire spread prevention technology used when inserting and installing thermoplastic synthetic resin piping through a through hole formed in a fire compartment body (for example, a structure such as a floor slab of a fire-resistant structure in a building) in a fire compartment area, and more specifically, to a fire spread prevention device that makes it easy to update synthetic resin piping and prevents flames, harmful gases, etc. from flowing into upper floors through the through hole due to the thermal expansion of a heat-expandable fire-resistant material installed below the floor slab due to heat expansion caused by the occurrence of a fire, and a piping structure using the fire spread prevention device.

[0002] The piping to which the present invention is applied is not particularly limited as long as it is a synthetic resin piping that is inserted into a through hole formed in a floor slab of a building, such as a water supply piping through which water flows, a drainage piping through which wastewater flows, or a cable protection pipe in which one or more electric or communication cables are installed. Furthermore, the type of synthetic resin that is the material of the piping to which the present invention is applied is not particularly limited, and examples of such synthetic resins that have thermoplastic properties include polyethylene, polybutene, polypropylene (polyolefin-based up to this point), and (rigid) polyvinyl chloride. Furthermore, the joining method in the case where the piping structure to which the present invention is applied has a joint portion where these synthetic resin pipes are connected to each other is not particularly limited, and examples of such joining methods include cap nut screw joints, flange joints, one-push insertion joints, union adapter joints, adhesive joints, rubber ring insertion joints, housing joints, electric fusion joints, and heat fusion joints. [Background technology]

[0003] The background art will be described below by taking as an example a case where the piping to which the present invention is applied is a drainage piping. For example, in an apartment building, which is a typical example of an apartment building, the floor slab serves as a fire compartment to prevent a fire that occurs on a lower floor from spreading to the floor above. The drainage pipes that drain water from the upper floors to the lower floors are formed by connecting drainage pipe joints that penetrate the floor slab on each floor with standpipes. In such drainage pipes, a fire spread prevention device is provided to prevent a fire that occurs on the lower floor from spreading to the upper floors through the drainage pipe holes that penetrate the floor slab or through the drainage pipes themselves.

[0004] For example, JP 2014-005689 A (Patent Document 1) filed by the applicant of the present application discloses a drainage piping structure equipped with such a fire spread prevention device. The drainage piping structure disclosed in Patent Document 1 is a drainage piping structure installed in a building to allow drainage to flow downward from a high place, and includes a noncombustible piping member that is provided to penetrate a floor slab and has a lower end connection part with a plug-shaped, a flammable piping member that has an upper end connection part with a socket-shaped and is connected to the lower end connection part of the noncombustible piping member, and a fire spread prevention device that is made of a noncombustible material and has a main body part that covers the connection part of the noncombustible piping member and the flammable piping member, as well as the outer periphery of the flammable piping member below the connection part, and a thermally expandable fireproof material is disposed between the main body part and the outer periphery of the flammable piping member, and a recess or protrusion is formed on the outer periphery of the lower connection part of the noncombustible piping member, and the fire spread prevention device is characterized in that it is engaged with the recess or protrusion to restrict downward movement. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-005689 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the drainage piping structure disclosed in Patent Document 1, a non-combustible piping member with a plug-shaped lower end connection part is fixed to a through hole provided in a floor slab by a filler (mortar, etc.). For this reason, it is not a big problem when the renewal of the piping is not considered, but when the piping is renewed due to damage to the piping or deterioration over time, it is necessary to destroy the mortar, which is the filler filled between the through hole and the non-combustible piping member, to renew the piping, which is undesirable. In addition, in the drainage piping structure disclosed in Patent Document 1, the non-combustible piping member fixed to the through hole provided in the floor slab is formed of a fire-resistant two-layer pipe in which the outside of a metal such as cast iron or a resin layer is covered with a fire-resistant layer such as mortar, and is required to have fire resistance. For this reason, it is possible to assume a case where it is undesirable that the piping inserted into the through hole provided in the floor slab must have non-combustibility (for example, when a lightweight and inexpensive (non-fire-resistant) synthetic resin pipe is inserted into the through hole provided in the floor slab). In such cases, there is a known technique in which a heat-expandable fire-resistant material is provided around the outer periphery of a synthetic resin pipe inserted into a through hole provided in the floor slab, and the synthetic resin pipe together with the heat-expandable fire-resistant material is fixed to the through hole provided in the floor slab with a filler material (mortar, etc.); however, as mentioned above, this can be undesirable in that it is necessary to destroy the mortar when updating the piping.

[0007] The present invention was developed in consideration of the above-mentioned problems, and its purpose is to provide a fire prevention device for a synthetic resin pipe that is inserted into a through hole formed in the floor slab of a building, and a piping structure using the fire prevention device, which allows for easy piping renewal. [Means for solving the problem]

[0008] In order to achieve the above object, the fire spread prevention device according to the present invention and the piping structure using the fire spread prevention device employ the following technical measures. In other words, a fire spread prevention device according to one aspect of the present invention is a fire spread prevention device for a synthetic resin pipe inserted into a through hole formed in the floor slab of a building, and includes a heat-expandable fire-resistant material arranged below the floor slab so as to be in contact with the outer periphery of the synthetic resin pipe, and a non-flammable retaining member that restrains the outer periphery of the heat-expandable fire-resistant material, and the retaining member includes a connecting portion that is freely swingably connected to a cylinder fixedly installed in the through hole.

[0009] Preferably, the cylinder is a sleeve fixed to the through hole with filler material, the lower end of the sleeve is located below the underside of the floor slab, the sleeve has a flange at the lower end, and the connection portion is configured to have a locking claw that engages with the flange. More preferably, the retaining member can be configured to include a pair of approximately semi-cylindrical band portions covering the outer periphery of the heat-expandable fire-resistant material, with one end of the approximately semicircular band portions connected by a hinge, and a joint portion joining the two band portions at the other end of the approximately semicircular band portions opposite the one end, and the locking claw can be provided at the upper end of the approximately semi-cylindrical shape.

[0010] More preferably, the retaining member can be configured to include N band pieces that divide the outer periphery of the thermally expandable fireproof material into N parts in the circumferential direction and cover the outer periphery, a band portion that assembles the N pieces into a pair into a substantially cylindrical shape, and a joint portion that joins the N band pieces, and the locking claws can be provided on the upper ends of the band pieces, where N is an integer of 2 or more. More preferably, the retaining member is formed in a plurality of rectangular shapes and includes a band portion that covers the outer periphery of the heat-expandable fire-resistant material with the inner side of the rectangular shapes, and a joint portion that joins both ends of the band portion, and the locking claw can be configured to be provided at the upper end of the rectangular shapes.

[0011] More preferably, the holding member may be configured to further include a lower connecting portion that is swingably connected to a pipe joint provided below the fire spread prevention device. A piping structure according to still another aspect of the present invention is a piping structure using any one of the fire spread prevention devices described above. Preferably, the cylindrical body is a sleeve fixed in the through hole with a filler material, and is configured to have a convex portion on the outer peripheral surface of the sleeve to prevent the sleeve from shifting in the through hole. More preferably, the protrusion can be provided on the outer circumferential surface of the sleeve at approximately the center in the up-down direction. Effect of the Invention

[0012] According to the present invention, it is possible to provide a fire prevention device for a synthetic resin pipe that is inserted into a through hole formed in the floor slab of a building, which allows for easy piping renewal, and a piping structure that uses the fire prevention device. [Brief description of the drawings]

[0013] [Figure 1] 1A is an overall side view (bottom is a cross-sectional view) of a piping structure 100 using a fire spread prevention device 1100 according to a first embodiment of the present invention, and FIG. 1B is an enlarged view of region 1B in FIG. 1A. [Diagram 2] FIG. 2A is a three-sided view of the holding member 1120 constituting the fire spread prevention device 1100 shown in FIG. 1 before assembly (setting on a synthetic resin pipe), FIG. 2B is a diagram for explaining the assembly procedure, and FIG. 2C is a two-sided view of the assembled state. [Diagram 3] FIG. 3A is a three-sided view of a holding member 2120, which is different from the holding member 1120 shown in FIG. 2, before assembly (setting in a synthetic resin pipe), FIG. 3B is a diagram for explaining the assembly procedure, and FIG. 3C is a two-sided view of the assembled state. [Figure 4] 4(A) is a side view of a holding member 3120, which is different from the holding member 1120 shown in FIG. 2 and the holding member 2120 shown in FIG. 3, before assembly (setting in a synthetic resin pipe), (B) a diagram for explaining the assembly procedure, (C) a top view of the assembled state, and (D) a cross-sectional view indicated by arrows 4D-4D in FIG. 4(A). [Diagram 5]5A is an overall side view (bottom is a cross-sectional view) of a piping structure 200 using a fire spread prevention device 5100 according to a second embodiment of the present invention, and FIG. 5B is an enlarged view of a region 5B in FIG. 5A. [Figure 6] FIG. 6A is an overall side view (bottom is cross-sectional view) of a piping structure using a sleeve 6200, which is a modified example of the sleeve 1200 fixed to the through hole of the floor slab S shown in FIG. 1 and FIG. 5 , (B) a side view (cross-sectional view) of the sleeve 6200, and (C) a side view (outline drawing) of the sleeve 6200. [Figure 7] FIG. 1 is a diagram for explaining a construction procedure (construction method) and a renewal procedure (renewal method) of piping in a piping structure common to embodiments of the present invention (part 1: when the piping is bent). [Figure 8] FIG. 13 is a diagram for explaining a construction procedure (construction method) and an update procedure (update method) of piping in a piping structure common to embodiments of the present invention (part 2: when the piping does not bend). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, as a fire prevention device for a synthetic resin pipe inserted into a through hole formed in a floor slab of a building according to the present invention and a piping structure using the fire prevention device, a first embodiment will be described with reference to Figures 1 to 4, a second embodiment with reference to Figure 5, a modified example (sleeve 6200) commonly applied to these two embodiments with reference to Figure 6, and an installation procedure (installation method) for realizing the piping structure common to the embodiments of the present invention and an updating procedure (updating method) for updating the piping (made of synthetic resin inserted into a through hole in the floor slab) in the piping structure with reference to Figures 7 to 8. In these Figures 1 to 8, the same components are assigned the same reference numerals and have the same functions, so that they may not be described repeatedly.

[0015] The piping structure according to the present invention is a structure in which a synthetic resin pipe is installed in a through hole of a floor slab using the fire spread prevention device according to the present invention by the installation procedure (installation method) shown in Figures 7 and 8. As described above in the technical field, the synthetic resin pipe to which the present invention is suitably applied is not particularly limited, but in Figure 7 it is a flexible pipe (e.g., made of polyolefin-based synthetic resin), and in Figure 8 it is a non-flexible pipe (e.g., made of rigid polyvinyl chloride), and the synthetic resin pipes in the other figures are not particularly limited, but are described as being flexible pipes (e.g., made of polyolefin-based synthetic resin).

[0016] <First embodiment> A fire spread prevention device 1100 according to a first embodiment of the present invention and a piping structure 100 using the fire spread prevention device 1100 will be described with reference to Figs. This piping structure 100 has a structure in which a synthetic resin pipe 1500 is inserted into a through hole (a hole having a diameter before being filled with mortar M) formed in a floor slab S of a building. In addition, in this piping structure 100, a fire spread prevention device 1100 is provided for preventing the spread of fire to the synthetic resin pipe 1500 inserted into the through hole formed in the floor slab S. The synthetic resin pipe 1500 inserted into the through hole provided in the slab S, the synthetic resin pipe 1500 on the upper floor side, and the synthetic resin pipe 1500 on the lower floor side are connected to each other. The synthetic resin pipes 1500 are connected to each other by a housing joint 1600. Again, as described above in the technical field, the method of joining synthetic resin pipes to which the present invention is suitably applied is not particularly limited, but as an example, in this embodiment, the synthetic resin pipes 1500 are connected to each other by a housing joint (method).

[0017] For this housing connection, grooves 1510 (this portion is shown in detail in FIG. 5 since it has the same structure as FIG. 1 and FIG. 5) are provided on both ends of the synthetic resin pipe 1500, and a pair of metal or resin couplings 1610 having a substantially hollow semi-cylindrical shape are engaged in the grooves 1510, and the pair of couplings 1610 are fastened by a fastening member 1620 (here, fastened by screwing a combination of a nut 1624 and a bolt 1622 inserted into a hole 1612 of the coupling 1610). A gasket 1630 is provided between the coupling 1610 and the synthetic resin pipe 1500. Here, the grooves 1510 are provided by processing the outer circumferential surface of the synthetic resin pipe 1500, but they may be formed by, for example, a part with a metal groove.

[0018] As described above, since flexible piping (for example, piping made of polyolefin-based synthetic resin) is used for the synthetic resin pipe 1500, it is possible to realize a piping structure with only one joint on each floor (as shown in FIG. 7 described later). In contrast, if non-flexible piping (for example, piping made of rigid polyvinyl chloride) is used for the synthetic resin pipe 1500, the piping structure will require at least two joints on each floor (as shown in FIG. 8 described later).

[0019] The synthetic resin pipe 1500 inserted into the through hole provided in the slab S is provided (separated) from the sleeve 1200 described later via a space SS. That is, since the mortar M is not in contact with the outer periphery of the synthetic resin pipe 1500, it is not necessary to destroy the mortar M when updating the synthetic resin pipe inserted into the through hole provided in the slab S (as will be described in detail later). Also, since the synthetic resin pipe 1500 inserted into the through hole provided in the slab S is not fixed to the through hole by mortar M and a space SS exists, a water stop packing 1800 is provided on the upper floor side between the synthetic resin pipe 1500 and the inner cylindrical surface of the sleeve 1200. This water stop packing 1800 is made of, for example, rubber, and prevents water leakage from the upper floor from propagating through the inner cylindrical surface of the sleeve 1200 to the lower floor, or prevents water from accumulating on the inner cylindrical surface of the sleeve 1200. The watertight packing 1800 is made of a material that will not generate smoke or harmful gases due to melting or the like in the event of a fire on the floor below. Furthermore, the synthetic resin pipe 1500 is fixed to the floor surface on the upper floor side with a floor band 1700.

[0020] This fire spread prevention device 1100 includes a heat-expandable fire-resistant material 1110 arranged below the floor slab S so as to be in contact with the outer periphery of a synthetic resin pipe 1500, and a non-flammable (e.g., made of metal) retaining member 1120 that restrains the outer periphery of the heat-expandable fire-resistant material 1110, and is characterized in that the retaining member 1120 includes a connecting portion that is freely swingably connected to a cylinder (e.g., a thin metal plate processed into an approximately hollow cylindrical shape) fixed to the through hole.

[0021] Here, the thermally expandable fire-resistant material 1110 is preferably a thermoplastic resin, expandable graphite, a resin composition containing zinc phosphate, butyl rubber containing graphite, or the like, and has an expansion rate of 8 times or more when heated for 10 minutes at 600° C. The material and amount (shape, size) of the thermally expandable fire-resistant material 1110 are determined so that the fire spread prevention device 1100 can fully exert the fire spread prevention function (taking into consideration the caliber of the synthetic resin pipe 1500, etc.).

[0022] Here, preferably, this cylindrical body is a sleeve 1200 fixed in a through hole with a filler (mortar M), the lower end of a substantially hollow cylindrical portion 1210 of the sleeve 1200 being located below the lower surface of the floor slab S, and this sleeve 1200 is provided with a flange 1220 at its lower end. And, as the above-mentioned connecting portion, it is characterized in that it is provided with a locking claw 1140 that locks with the flange 1220. Here, the flange 1220 and the locking claw 1140 do not need to exist as a full circle as a ring (to the extent that they can continue to be connected stably so as to be free to swing), and may exist partially on a part of the circumference.

[0023] The outer peripheral surface of the sleeve 1200 (the surface that comes into contact with the mortar M) is surface-treated (surface treatment such as matte finish) to increase friction with the mortar M, and the sleeve 1200 is prevented from moving (shifting) in the vertical direction (not only downward but also upward) in the through hole. 5, the sleeve 1200 may fall downward from a through hole provided in the slab S, the fire spread prevention device 1100 may rise upward and push up the sleeve 1200, and when the synthetic resin pipe 1500 is inserted through the sleeve 1200 from the lower floor to the upper floor during construction and renewal of this piping structure 100, the synthetic resin pipe 1500 may push up the lower end face of the sleeve 1200 (the end face of the flange 1220 provided at the lower end of the sleeve 1200) and push up the sleeve 1200, so that it is necessary to restrain the up-down movement of the sleeve 1200 in consideration of these possibilities.

[0024] More preferably, the retaining member 1120, which is non-flammable (by being made of metal, although not limited to this), includes a pair of approximately semi-cylindrical band portions 1122 covering the outer periphery of the heat-expandable fire-resistant material 1110, one end of each of which is connected by a hinge 1124, and a joint portion which joins the two band portions 1122 at the other end of the approximately semicircular portion opposite the one, as shown in FIG. 2, and is provided with the above-mentioned locking claw 1140 at the upper end of the approximately semi-cylindrical shape.

[0025] More specifically, this joint includes a lower joint 1128D having a through hole 1129 and an upper joint 1128U having a through hole 1129 and a screw hole 1130. In the direction of the outlined arrow shown in FIG. 2(B), the band parts 1122 on the opposite side (joint side) from the hinge 1124 side are brought close to each other so as to cover the synthetic resin pipe 1500 (with the thermally expandable fireproof material 1110 provided at a predetermined position), the position of the through hole 1129 of the lower joint 1128D is matched with the position of the through hole 1129 of the upper joint 1128U, and the wing bolt 1126 is inserted from below and screwed into the screw hole 1130, so that they are assembled and integrated as shown in FIG. 2(C). The use of the wing bolt 1126 is preferable because it does not require tools.

[0026] Since the fire spread prevention device according to the present invention has a configuration including a thermally expandable fire-resistant material and a holding member, the fire spread prevention device 1100 according to this embodiment is configured by assembling the holding member 1120 with the thermally expandable fire-resistant material 1110 set therein as described above to cover the synthetic resin pipe 1500. However, the fire spread prevention device 1100 can also be provided by providing the thermally expandable fire-resistant material 1110 separate from the holding member 1120 in the synthetic resin pipe 1500, and covering the synthetic resin pipe 1500 provided with the thermally expandable fire-resistant material 1110 with the holding member 1120.

[0027] More preferably, the holding member 1120 may be replaced by a holding member 2120 shown in FIG. 3. This holding member 2120 is also non-combustible (not limited to this, but is made of metal). Here, the holding member shown in FIG. 3 includes N band pieces that cover the outer periphery of the thermally expandable fireproof material 1110 by dividing it into N (N is an integer of 2 or more) in the circumferential direction, includes a band portion that is assembled into a pair of N pieces into a substantially cylindrical shape, and a joint portion that joins the N band pieces, and includes a locking claw at the upper end of the band piece, and in the case shown in FIG. 3, N=2. As shown in FIG. 3, this holding member 2120 includes a pair of band portions 2122 (each of which is a band piece) that are substantially semi-cylindrical and cover the outer periphery of the thermally expandable fireproof material 1110, and a joint portion that joins these two band portions 2122, and includes the above-mentioned locking claw 1140 at the upper end of the substantially semi-cylindrical shape (band piece).

[0028] More specifically, in comparison with the holding member 1120, the holding member 2120 does not have the hinge 1124 that the holding member 1120 has. Therefore, the opposing band parts 2122 are brought close to each other in the direction of the outlined arrow shown in Fig. 3(B) so as to cover the synthetic resin pipe 1500 (with the thermally expandable fireproof material 1110 provided at a predetermined position), the position of the through hole 1129 of the lower joint part 1128D is aligned with the position of the through hole 1129 of the upper joint part 1128U, and the wing bolt 1126 is inserted from below and screwed into the screw hole 1130, so that they are assembled and integrated as shown in Fig. 3(C).

[0029] More preferably, instead of the holding members 1120 and 2120, a holding member 3120 shown in FIG. 4 may be used. This holding member 3120 is also non-flammable (by being made of metal, although this is not limited thereto). This holding member 3120 includes a band portion formed by connecting multiple metal plates 3124 having a rectangular shape as shown in FIG. 4(A) to FIG. 4(C) and a cross-sectional shape as shown in FIG. 4(D) with each long side being freely connected to each other, and joint portions 3124 joining both ends of the band portion, and each of the multiple metal plates 3124 has a locking claw as described above. At the upper end thereof, a folded portion 3140 is provided. As described above, the locking claw does not need to exist as a full circle, but may exist partially on a part of the circumference, so this folded portion 3140 may be provided at the upper ends of some, not all, of the plurality of metal plates 3124.

[0030] More specifically, both ends of the band portion formed by the multiple metal plates 3124 are brought close to each other in the direction of the outlined arrow shown in Fig. 4(B) so as to cover the synthetic resin pipe 1500 (with the thermally expandable fire-resistant material 1110 provided at a predetermined position), and are integrated by a joint 3124 that joins both ends of the band portion. An example of the joint 3124 is a so-called snap lock (made of metal and having non-flammability, but is not limited to this). Thus, the fire spread prevention device 1100 according to the first embodiment of the present invention and the piping structure 100 using the fire spread prevention device 1100 have the above-mentioned configuration. The effects of such a configuration will be described later.

[0031] <Second embodiment> Next, a fire spread prevention device 5100 according to a second embodiment of the present invention and a piping structure 200 using the fire spread prevention device 5100 will be described with reference to Fig. 5. The holding member 1120, the holding member 2120, and the holding member 3120 constituting the fire spread prevention device 1100 in the above-mentioned first embodiment are provided only in the upper part of the fire spread prevention device 1100 with a connection part (locking claw 1140 or folded part 3140 as locking claw) that is swingably connected to a cylindrical body (brim 1220 of sleeve 1200) fixed to a through hole. The fire spread prevention device 5100 according to the second embodiment described below is different only in that it is provided with a lower connection part (here, lower locking claw 5140) that is swingably connected to a pipe joint (here, protrusion 2510) provided below in addition to the connection part (locking claw 1140) that is swingably connected to a cylindrical body (brim 1220 of sleeve 1200) at the upper part. Other than that, the second embodiment is the same as the first embodiment, and the same reference numerals are used and the functions are also the same, so that the description will not be repeated.

[0032] The holding member 5120 constituting the fire spread prevention device 5100 in this embodiment is characterized in that it further includes a lower connection part (here, the lower engaging claw 5140) that is freely swingably connected to a pipe fitting (here, the protrusion 2510) provided below the fire spread prevention device 5100. More specifically, holding member 5120 further includes lower locking claw 5140 at its lower end, which is vertically symmetrical with locking claw 1140 provided at its upper end. Lower locking claw 5140 is connected to fire spread prevention device 5100 so as to be freely swingable by being locked to protrusion 2510 provided below fire spread prevention device 5100. Protrusion 2510 corresponds to flange 1220 described above in terms of the function of locking holding member 5120 constituting fire spread prevention device 5100 so as to be freely swingable.

[0033] Here, in the present invention, the method of joining synthetic resin pipes is not particularly limited, but as an example, the synthetic resin pipes are connected to each other by housing joint. For this reason, although not limited, the protrusion 2510 is preferably formed on the synthetic resin pipe 2500 when the groove 1510 is formed (because it is preferable to form a part of the housing joint 1600 which is a pipe joint), so the lower locking claw 5140 which is the lower connection part is described as being locked to the pipe joint (the housing joint 1600 which is a pipe joint). In other words, the counterpart to which the lower connection part provided on the holding member which constitutes the fire spread prevention device in the present invention is connected to freely swing is the pipe joint (not limited to the pipe joint by housing joint). In particular, when the housing joint 1600 is used as the pipe joint, and the groove 1510 is formed by a metal part or the like, rather than by processing the outer circumferential surface of the synthetic resin pipe 1500, it is preferable that the groove 1510 and the protrusion 2510 can be formed together on the part.

[0034] Thus, the fire spread prevention device 5100 according to the second embodiment of the present invention and the piping structure 200 using the fire spread prevention device 5100 have the above-mentioned configuration. The action and effect of such a configuration will be described later. Note that the holding member 5120 of the fire spread prevention device 5100 according to this embodiment is configured so as to further include the lower locking claw 5140 in addition to the holding member 1120 constituting the fire spread prevention device 1100 described in the first embodiment. The holding member 2120 or the holding member 3120 described in the embodiment may be configured to further include a lower locking claw 5140.

[0035] <Modifications common to both embodiments> Next, a modified example commonly applicable to the first and second embodiments of the present invention will be described with reference to Fig. 6. This modified example differs only in that it uses a sleeve 6200 having a different shape from the sleeve 1200 described in the above two embodiments. Other than that, it is the same as the first embodiment, and the same reference numerals are used and the functions are the same, so that the description will not be repeated.

[0036] In this modification, a sleeve 6200 is used instead of the above-mentioned sleeve 1200. The sleeve 6200, which is a cylindrical body, is fixed in the through hole with mortar M, which is a filler, and has a protrusion 6212 on the outer circumferential surface of the sleeve 6200 (of the approximately hollow cylindrical portion 6210). For the reasons described above, this protrusion preferably prevents the sleeve 6200 from being displaced in the up-down direction in the through hole. More preferably, this protrusion 6212 is characterized by being provided on the outer circumferential surface of the sleeve 6200 at approximately the center in the up-down direction (of the approximately hollow cylindrical portion 6210).

[0037] This convex portion 6212 can effectively suppress the possibility of the sleeve 6200 falling downward through a through hole provided in the slab S, the possibility of the fire prevention device rising upward and pushing up the sleeve 6200, and the possibility of the synthetic resin pipe 1500 pushing up the lower end face of the sleeve 6200 (the end face of the flange 1220 at the lower end of the sleeve 6200) and pushing up the sleeve 6200 when the synthetic resin pipe 1500 is inserted through the sleeve 6200 from the lower floor to the upper floor during construction and renewal of this piping structure.

[0038] <Construction and renewal methods common to all embodiments> Next, we will explain a construction method (construction procedure) for realizing a piping structure using a fire spread prevention device having the above-mentioned configuration, and a piping renewal method (renewal state) in a piping structure realized by the construction method. In the following, first, the installation method and renewal method when the piping bends (for example, when synthetic resin pipe 1500A made of polyolefin-based synthetic resin is used) will be described with reference to Fig. 7, and then, the installation method and renewal method when the piping does not bend (for example, when synthetic resin pipe 1500B made of hard polyvinyl chloride is used) will be described with reference to Fig. 8. Here, the reference numerals in Fig. 7 and Fig. 8 other than the (bending) synthetic resin pipe 1500A and the (non-bending) synthetic resin pipe 1500B are the same as those in Fig. 1. Since the reference numerals are the same as those in Fig. 1, the retaining member 1120 will be used in the following description.

[0039] Also, Figures 7(A) and 8(A) show elevation views after construction is completed, as well as the definition of one unit, one unit to be constructed, and one unit to be updated. Here, horizontal branch pipes (including cases where the synthetic resin pipe is only provided with a horizontal branch pipe connection part) are connected to synthetic resin pipes arranged vertically on each floor, but regardless of the presence or absence of this horizontal branch pipe, in Figure 7, the piping structure is realized with only one joint (jointed with a joint) on each floor, and in Figure 8, the piping structure is realized with two joints (jointed with a joint) on each floor. What is important in terms of construction and renewal is that when this horizontal branch pipe is connected, the synthetic resin pipe cannot be installed so that it passes through the through hole provided in the slab S, and taking this into consideration, it is preferable to set one unit including the vertical position of the horizontal branch pipe (between the lower floor slab S and the upper floor slab S, one unit is formed by a synthetic resin pipe equipped with a pipe fitting, horizontal branch pipe, and fire spread prevention device 1100 in that order from below, rather than the order of horizontal branch pipe, pipe fitting, and fire spread prevention device 1100 from below).

[0040] · Installation method using synthetic resin pipe 1500A (flexible piping) First, as shown in Fig. 7(B), the sleeve 1200 is fixed to a through hole provided in the slab S with mortar M. At this time, the sleeve 1200 is set in the through hole provided in the slab S, and mortar M is filled between the sleeve 1200 and the through hole from the upper floor. After construction in this manner, the lower end of the approximately hollow cylindrical portion 1210 of the sleeve 1200 is located below the lower surface of the floor slab S, and since the sleeve 1200 has a flange 1220 at its lower end, the flange 1220 is located below the lower surface of the floor slab S.

[0041] Next, as shown in Fig. 7(C), for one unit (connected to the horizontal branch pipe) to be constructed, a member 1502 (cap, buffer material, etc.) for preventing damage to the joint is provided at the upper end of the synthetic resin pipe 1500A. This one unit is passed through a through hole (more precisely, a sleeve 1200 fixed to the through hole with mortar M) provided in the floor slab S by bending and curving (tilting) the synthetic resin pipe 1500A. Next, as shown in Fig. 7(D), the synthetic resin pipe 1500A of the lower floor and the synthetic resin pipe 1500A to be constructed are connected (jointed), and the horizontal branch pipe of the synthetic resin pipe 1500A to be constructed and the existing horizontal branch pipe of the construction target floor are connected (jointed). The connecting method here is not limited to housing connection, as described above.

[0042] Furthermore, a fire spread prevention device 1100 including a thermally expandable fireproof material 1110 and a retaining member 1120 is provided at a predetermined location so as to cover the synthetic resin pipe 1500A. At this time, a locking claw 1140 provided at the upper end of the retaining member 1120 is locked to a flange 1220 provided at the lower end of a sleeve 1200 (fixed to the through hole by a filler material M) located below the lower surface of the floor slab S, so that the retaining member 1120 is connected to the sleeve 1200 so as to be freely swingable. Furthermore, in the direction of the white arrow shown in Figure 2 (B), the band portions 1122 on the opposite side (joint side) from the hinge 1124 are brought close to each other so as to cover the synthetic resin pipe 1500 (with the heat-expandable fire-resistant material 1110 provided at a predetermined position), the position of the through hole 1129 of the lower joint 1128D is aligned with the position of the through hole 1129 of the upper joint 1128U, and the wing bolt 1126 is inserted from below and screwed into the screw hole 1130, whereby the fire spread prevention device 1100 is assembled and integrated as shown in Figure 2 (C) and the fire spread prevention device 1100 is set on the synthetic resin pipe 1500A.

[0043] Next, as shown in FIG. 7(E), on the upper floor, the damage prevention member 1502 at the upper end of the synthetic resin pipe 1500A is removed, and a watertight gasket 1800 (not shown) is installed between the synthetic resin pipe 1500 and the inner cylindrical surface of the sleeve 1200, and the synthetic resin pipe 1500A is fixed with a floor band 1700. By the above construction method, the piping structure shown in FIG. 7(A) is realized.

[0044] -Renewal method using synthetic resin pipe 1500A (flexible piping) Next, a method for updating the synthetic resin pipe 1500A in the piping structure thus realized will be described. First, as shown in FIG. 7(F), the floor band 1700 that fixes the synthetic resin pipe 1500A to be renewed to the floor of the floor above the floor to be renewed is removed, and the watertight packing 1800 attached between the synthetic resin pipe 1500A and the inner cylindrical surface of the sleeve 1200 is removed. At this time, the synthetic resin pipe 1500A is not fixed to the through hole with mortar M, and the synthetic resin pipe 1500A is also separated from the sleeve 1200 via the space SS. Therefore, since the mortar M is not in contact with the outer periphery of the synthetic resin pipe 1500A, in this renewal method, it is not necessary to destroy the mortar M when renewing the synthetic resin pipe 1500A inserted into the through hole provided in the slab S.

[0045] Next, as shown in FIG. 7(G), the synthetic resin pipe 1500A on the upper floor and the synthetic resin pipe 1500A on the lower floor are disconnected from the synthetic resin pipe 1500A to be updated (the state of being connected by the joint is released), and the horizontal branch pipe of the synthetic resin pipe 1500A to be installed is disconnected from the existing horizontal branch pipe on the floor to be updated (the state of being connected by the joint is released). Furthermore, the fire spread prevention device 1100 is removed from the synthetic resin pipe 1500A to be installed. As described above, the joining method is not limited, so the joining release method is also not limited, and in the case where the synthetic resin pipe 1500A is joined in an undetachable manner (for example, by adhesive, etc.), the synthetic resin pipe 1500A is cut. On the other hand, in the case where the synthetic resin pipe 1500A is joined in a detachable manner including the housing joint, it is preferable that the state of being joined by the joint can be easily released by releasing the fastening of the fastening member 1620 of the housing joint portion 1600, for example, without cutting the synthetic resin pipe 1500A.

[0046] Next, as shown in FIG. 7(H), the unit to be updated (where the connection has been released) is synthesized. The resin pipe 1500A is bent to warp (tilt) the synthetic resin pipe 1500A and removed from the through-hole (more precisely, the sleeve 1200 fixed to the through-hole with mortar M) provided in the floor slab S. At this time, the sleeve 1200 maintains the state of being fixed to the through-hole provided in the slab S with mortar M. Then, a new synthetic resin pipe 1500A for one unit for renewal is prepared, and the new synthetic resin pipe 1500A for one unit is installed using the installation method described with reference to Figs. 7(C) to 7(E), thereby updating the synthetic resin pipe 1500A on the floor to be renewed without destroying the mortar M of the floor slab S.

[0047] · Installation method using synthetic resin pipe 1500B (non-flexible piping) Next, the construction method and renewal method when the synthetic resin pipe 1500B made of hard polyvinyl chloride is adopted instead of the synthetic resin pipe 1500A made of polyolefin-based synthetic resin will be described with reference to FIG. 8. Note that, with regard to the construction method and renewal method when the synthetic resin pipe 1500B is adopted, which will be described below, only the parts different from the construction method and renewal method described above when the synthetic resin pipe 1500A is adopted will be described. Specifically, the description will be made with reference to FIG. 8(C) and FIG. 8(H). Note that, with regard to the definition of one unit itself and one unit to be constructed and renewed, one unit shown in FIG. 8 is shorter than one unit shown in FIG. 7, and one unit shown in FIG. 7 exceeds one floor, whereas one unit shown in FIG. 8 is limited to one floor.

[0048] As shown in Figure 8 (C), after the synthetic resin pipe 1500B on the lower floor and the synthetic resin pipe 1500B to be worked on are installed so that they can be connected (jointed), the synthetic resin pipe 1500B on the upper floor is inserted into a through hole provided in the floor slab S (more precisely, a sleeve 1200 fixed to the through hole with mortar M) to install the synthetic resin pipe 1500B on the upper floor and the synthetic resin pipe 1500B to be worked on so that they can be connected (jointed) (install from bottom to top in order as shown in Figure 8 (D) so that they can be connected (jointed)).

[0049] -Renewal method using synthetic resin pipe 1500B (non-flexible piping) As shown in FIG. 8(H), the synthetic resin pipe 1500B for one unit to be updated (the joint is released and the fire spread prevention device 1100 is removed) is moved to the side. Then, the synthetic resin pipe 1500B for the upper floor is pulled out from the through hole (more precisely, the sleeve 1200 fixed to the through hole with mortar M) provided in the floor slab S. At this time, the sleeve 1200 maintains the state of being fixed to the through hole provided in the slab S with mortar M. Then, a new synthetic resin pipe 1500B for one unit for updating is prepared, and the new synthetic resin pipe 1500B for one unit is installed using the installation method described with reference to FIG. 8(C) and FIG. 7(D) to FIG. 7(E), thereby updating the synthetic resin pipe 1500B for the floor to be updated without destroying the mortar M of the floor slab S.

[0050] <Effects of the fire spread prevention device and piping structure according to the above-described embodiment> The fire spread prevention device and piping structure having the above-described configuration provide the following advantageous effects. (1) Even if an abnormality occurs in the synthetic resin pipe making it necessary to replace it, or even if there is no abnormality but it becomes necessary to replace it due to deterioration over time, the synthetic resin pipe inserted through the through hole provided in the floor slab S can be repeatedly replaced (renewed) without destroying the mortar M that embeds the through hole provided in the floor slab S. (2) The fire prevention device is constructed so that the retaining member and the heat-expandable fire-resistant material are integrally formed, and its upper part (locking claw 1140) is freely swingably engaged with the flange part of the sleeve, and its lower part (lower locking claw 5140) is freely swingably engaged with the pipe fitting. This eliminates the need for prior confirmation, such as measuring the installation height, and the device can be reliably installed in the designated position regardless of individual differences. (3) Since the upper part of the fire prevention device is supported so as to be able to swing freely relative to the sleeve and the lower part is supported so as to be able to swing freely relative to the pipe fitting, the fire prevention device can respond to thermal expansion and contraction as well as to shaking caused by earthquakes, etc., thereby preventing stress concentration on the synthetic resin pipe and forming a fire compartment area. (4) The fire prevention device is designed so that its upper part can freely swing with the sleeve, and its lower part is connected to the pipe. Because it is supported so that it can swing around by hand (the axial position is maintained so that it can swing freely), it is possible to reliably prevent the synthetic resin pipe from falling due to thermal expansion and contraction or due to its own weight.

[0051] As described above, according to the fire spread prevention device of the present embodiment and the piping structure using the fire spread prevention device, it is possible to provide a fire spread prevention device of a synthetic resin pipe that is inserted into a through hole formed in the floor slab of a building, and a piping structure using the fire spread prevention device, which allows for easy piping renewal. It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Industrial Applicability]

[0052] The present invention is preferable as a fire prevention technology used when inserting and installing flammable synthetic resin piping through a through hole formed in a floor slab in a fire compartment area, and is particularly preferable in that it allows the synthetic resin piping to be easily updated and prevents flames, harmful gases, etc. from flowing into the upper floors through the through hole due to the thermal expansion of the heat-expandable fire-resistant material installed below the floor slab due to thermal expansion due to the heat generated in the event of a fire. [Explanation of symbols]

[0053] 100, 200 piping structure 1100, 5100 Fire prevention device 1110 Thermally expandable fireproofing material 1120, 2120, 3120, 5120 Retaining member 1500 Synthetic resin pipe 1600 Housing joint 1700 Floor Band 1800 Watertight packing

Claims

1. A fire prevention device for a synthetic resin pipe inserted into a through hole formed in a floor slab of a building, A thermally expandable fireproof material provided below the floor slab so as to be in contact with an outer periphery of the synthetic resin pipe; and a non-combustible retaining member that restrains the outer periphery of the thermally expandable fireproof material, the holding member includes a connecting portion that is swingably connected to a cylindrical body fixed in the through hole, The cylindrical body is a sleeve fixed in the through hole by a filling material, the lower end of the sleeve is located below the lower surface of the floor slab, and the sleeve has a flange at the lower end, A fire spread prevention device, characterized in that the connection portion has a locking claw that locks onto the flange.

2. The retaining member includes a pair of substantially semi-cylindrical band portions covering the outer periphery of the thermally expandable fireproof material, the pair of substantially semi-circular band portions being connected to each other at one end by a hinge, and a joint portion that joins the two band portions at the other end of the substantially semi-circular portion opposite to the one end, The fire spread prevention device according to claim 1 , wherein the engaging claw is provided at an upper end of the substantially semi-cylindrical shape.

3. The retaining member includes N band pieces that cover the outer periphery of the thermally expandable fireproof material in the circumferential direction by dividing it into N parts, and includes a band portion that is assembled into a pair of N pieces into a substantially cylindrical shape, and a joint portion that joins the N band pieces, 2. The fire spread prevention device according to claim 1, wherein the locking claw is provided on an upper end of the band piece.

4. The retaining member includes a band portion formed in a plurality of rectangular shapes, the band portion covering the outer periphery of the thermally expandable fireproof material with the inner periphery of the rectangular shape, and a joint portion joining both ends of the band portion, The fire spread prevention device according to claim 1 , wherein the locking claw is provided at an upper end of the rectangular shape.

5. The fire spread prevention device according to any one of claims 1 to 4, characterized in that the retaining member further includes a lower connection portion that is freely swingably connected to a pipe joint provided below the fire spread prevention device.

6. A piping structure using the fire spread prevention device according to any one of claims 1 to 5.

7. The piping structure according to claim 6, wherein the cylindrical body is a sleeve fixed in the through hole by a filling material, and the sleeve has a convex portion on an outer circumferential surface thereof to prevent the sleeve from shifting in the through hole.

8. The piping structure according to claim 7 , wherein the protrusion is provided on an outer circumferential surface of the sleeve at a substantially central portion in a vertical direction.

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