JP2023040728A - Fire spreading prevention device and pipeline structure using the same - Google Patents

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

The present invention is used when installing thermoplastic synthetic resin pipes through through-holes formed in a fire protection compartment (for example, a building frame such as a floor slab of a fire resistant structure in a building) in a fire protection compartment area. More specifically, regarding the fire spread prevention technology used in the The present invention relates to a fire spread prevention device that prevents flames, harmful gases, and the like from flowing into upper floors through a through hole due to expansion, and a piping structure using the fire spread prevention device.

The pipes to which the present invention is applied include water supply pipes in which water flows, drainage pipes in which waste water flows, and cable protection pipes in which one or more electric cables or communication cables are installed. There is no particular limitation as long as it is a synthetic resin pipe that is inserted through a through hole formed in a floor slab of a building. 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 thermoplastic materials such as polyethylene, polybutene, polypropylene (so far polyolefin-based), (hard) poly Vinyl chloride etc. are mentioned. Furthermore, in the piping structure to which the present invention is applied, there is no particular limitation on the joining method in the case where these synthetic resin pipes are provided with joints that are connected to each other. Insertion joint, union adapter joint, adhesive joint, rubber ring insertion joint, housing joint, electrical fusion joint, thermal fusion joint, and the like can be mentioned.

The background art will be described by taking as an example a case where the pipe to which the present invention is applied is a drain pipe.
For example, in a condominium, which is a representative example of collective housing, floor slabs play a role as a fireproof partition to prevent a fire that breaks out on a lower floor from spreading to the upper floors. Drain pipes for draining waste water from upper floors to lower floors are formed by vertically connecting drain pipe joints arranged through floor slabs on each floor with vertical pipes. Such drain pipes are equipped with a fire spread prevention device that prevents a fire from spreading to upper floors through a hole for drain pipes penetrating through the floor slab or through the inside of the drain pipes.

For example, Japanese Patent Application Laid-Open No. 2014-005689 (Patent Document 1) filed by the applicant of the present application discloses a drainage pipe structure including such a device for preventing the spread of fire. The drainage piping structure disclosed in Patent Document 1 is a drainage piping structure that is constructed in a building and allows drainage to flow down from a high place, and is provided to penetrate through a floor slab and has a lower end connection part with a spigot shape. A nonflammable piping member, a combustible piping member having a receptacle-shaped upper end connection portion and connected to a lower end connection portion of the nonflammable piping member, and the nonflammable piping member and the combustible pipe formed of a nonflammable material. A fire spread comprising a connecting portion of members, and a body portion covering the outer periphery of the combustible piping member below the connecting portion, and a thermally expandable refractory material disposed between the body portion and the outer periphery of the combustible piping member. and a prevention device, wherein a concave portion or a convex portion is formed on the outer periphery of the lower connection portion of the incombustible piping member, and the fire spread prevention device is engaged with the concave portion or the convex portion to move downward. is regulated.

JP 2014-005689 A

In the drainage pipe structure disclosed in Patent Document 1, a non-combustible pipe member having an insert-shaped lower end connecting portion is fixed to a through hole provided in a floor slab with a filler (such as mortar). For this reason, it is not a big problem unless the renewal of the piping is taken into consideration. It is assumed that it is not preferable to renew the piping by destroying the mortar, which is the filler filled between. In addition, in the drainage pipe structure disclosed in Patent Document 1, the nonflammable pipe member fixed to the through hole provided in the floor slab is made of a metal such as cast iron or a fireproof layer such as mortar on the outside of the resin layer. It must be made of fireproof double-layered pipe and have fire resistance. For this reason, if it is not desirable that the pipes inserted through the through-holes provided in the floor slab must be non-combustible (for example, if light-weight and inexpensive (not fire-resistant) synthetic resin pipes are provided in the floor slab, is inserted into a through-hole provided) is assumed. In such a case, a thermally expandable refractory material is provided around the outer periphery of the synthetic resin pipe inserted through the through hole provided in the floor slab, and the synthetic resin pipe is filled with a filler (such as mortar) together with the thermally expandable refractory material. There is also a known technique for fixing through holes provided in the floor slab, but as described above, it is assumed that this is not preferable in that it is necessary to destroy the mortar and renew the piping when renewing the piping.

DISCLOSURE OF THE INVENTION The present invention was developed in view of the above-mentioned problems, and an object of the present invention is to facilitate the renewal of piping by inserting pipes into through-holes formed in floor slabs of buildings. The object of the present invention is to provide a device for preventing the spread of fire for a synthetic resin pipe and a piping structure using the device for preventing the spread of fire.

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 take the following technical means.
That is, 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 through a through hole formed in a floor slab of a building, wherein the synthetic resin pipe is inserted below the floor slab. A heat-expandable fireproof material provided so as to be in contact with the outer circumference of the resin pipe, and a nonflammable holding member that restrains the outer circumference of the heat-expandable fireproof material, and the holding member is fixed to the through hole. It is characterized by including a connecting portion that is pivotably connected to the cylindrical body.

Preferably, the cylindrical body is a sleeve fixed in the through hole with a filler material, the lower end of the sleeve is positioned below the lower surface of the floor slab, the sleeve is provided with a flange at the lower end, and the The connecting portion can be configured to have a locking pawl that locks onto the collar.
More preferably, the holding member includes two substantially semi-cylindrical band portions that cover the outer periphery of the thermally expandable refractory material, and a pair of substantially semi-circular band portions that are connected to each other at one ends by a hinge; and a joining portion that joins the two band portions at the other end of the substantially semicircular shape on the opposite side, and the locking pawl is provided at the upper end of the substantially semicylindrical shape.

More preferably, the holding member includes N band pieces covering the outer periphery of the thermally expandable refractory material divided into N pieces in the circumferential direction, and the N band portions are assembled in a pair into a substantially cylindrical shape; and a joint portion for joining the N band pieces, and the locking pawl is provided at the upper ends of the band pieces. Here, N is an integer of 2 or more.
More preferably, the holding member is formed in a plurality of strip shapes, and includes a band portion covering the outer periphery of the thermally expandable refractory material by the inner peripheral side of the strip shape, and a joint portion joining both ends of the band portion. and the locking pawl can be configured to be provided at the upper end of the strip shape.

More preferably, the holding member may further include a lower connecting portion 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 characterized by being a piping structure using any one of the fire spread prevention devices described above.
Preferably, the cylindrical body is a sleeve that is fixed in the through hole with a filler, and has a convex portion on an outer peripheral surface of the sleeve to prevent the sleeve from being displaced in the through hole. can do.
More preferably, the convex portion can be configured to be provided on the outer peripheral surface of the sleeve at a substantially central portion in the up-down direction.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a fire spread prevention device for a synthetic resin pipe inserted through a through hole formed in a floor slab of a building, and a piping structure using the fire spread prevention device, which facilitates renewal of piping. can do.

(A) Overall side view (bottom is cross-sectional view) of piping structure 100 using fire spread prevention device 1100 according to the first embodiment of the present invention, (B) Enlarged view of region 1B in FIG. 1 (A) is. (A) Three-sided view of holding member 1120 constituting fire spread prevention device 1100 shown in FIG. 2 is a two-sided view of the folded state; FIG. Regarding the holding member 2120 different from the holding member 1120 shown in FIG. 2, (A) a three-sided view before assembly (set in a synthetic resin pipe), (B) a diagram for explaining the assembly procedure, (C) assembled It is a two-sided view of a state. 2 and holding member 3120 different from holding member 2120 shown in FIG. 3 (A) Side view before assembly (set in synthetic resin pipe), (B) for explaining the assembly procedure , (C) a top view of the assembled state, and (D) a cross-sectional view taken along the arrow 4D-4D in FIG. 4(A). (A) Overall side view (lower side is cross-sectional view) of piping structure 200 using fire spread prevention device 5100 according to the second embodiment of the present invention, (B) Enlarged view of area 5B in FIG. 5(A) is. (A) Overall side view (below is a cross-sectional view), (B ) is a side view (sectional view) of the sleeve 6200, and (C) is a side view (outline view) of the sleeve 6200. FIG. It is a figure (1: when piping bends) for demonstrating the construction procedure (construction method) and renewal procedure (renewal method) of piping in the piping structure common to embodiment of this invention. It is a figure (2: when piping does not bend) for demonstrating the construction procedure (construction method) and renewal procedure (renewal method) of piping in the piping structure common to embodiment of this invention.

Hereinafter, as a fire spread prevention device for a synthetic resin pipe inserted through a through hole formed in a floor slab of a building according to the present invention and a piping structure using the fire spread prevention device, a first embodiment will be described with reference to FIGS. 4, with reference to FIG. 5 for the second embodiment, and with reference to FIG. 6 for a modification (sleeve 6200) commonly applied to these two embodiments, the present invention. Figure shows the construction procedure (construction method) for realizing the piping structure common to the embodiment and the renewal procedure (renewal method) for renewing the pipe (made of synthetic resin inserted through the through-hole of the floor slab) in the piping structure Each will be described in order with reference to FIGS. In these FIGS. 1 to 8, the same components are denoted by the same reference numerals and have the same functions, so the description may not be repeated.

The piping structure according to the present invention is a structure in which synthetic resin pipes are installed in the through-holes of the floor slab using the fire spread prevention device according to the present invention according to the construction procedure (construction method) shown in FIGS. Here, as described above in the technical field, the synthetic resin pipe to which the present invention is suitably applied is not particularly limited. 8 is a pipe that does not bend (for example, made of hard vinyl chloride), and the synthetic resin pipe in the drawings other than these is not particularly limited, but it is a flexible pipe (for example, a polyolefin synthetic resin pipe). It is described as having

<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. 1 to 4. FIG.
This piping structure 100 has a structure in which a synthetic resin pipe 1500 is inserted through a through hole (a hole having a diameter before being filled with mortar M) formed in a floor slab S of a building. The piping structure 100 as described above is provided with a fire spread prevention device 1100 for preventing the spread of fire in the synthetic resin pipe 1500 inserted through the through hole formed in the floor slab S. The synthetic resin pipes 1500 inserted through the through-holes provided in the slab S, the synthetic resin pipes 1500 on the upper floor side, and the synthetic resin pipes 1500 on the lower floor side are connected by housing joints 1600 . Again, as described above in the technical field, the method of joining synthetic resin pipes to which the present invention is preferably applied is not particularly limited. Synthetic resin pipes 1500 are connected to each other.

Grooves 1510 are provided at both ends of the synthetic resin pipe 1500 for this housing connection (this portion is shown in detail in FIG. 5 because it has the same structure as in FIGS. 1 and 5). A pair of metal or resin-made couplings 1610 having a substantially hollow semi-cylindrical shape are engaged, and the pair of couplings 1610 are fastened by a fastening member 1620 (here, a nut 1624 and a coupling 1610). It is fastened by screwing in combination with a bolt 1622 inserted through the hole 1612 . A gasket 1630 is provided between the coupling 1610 and the synthetic resin pipe 1500 . Although the groove 1510 is provided here by processing the outer peripheral surface of the synthetic resin pipe 1500, it may be formed by a component having a metal groove, for example.

As described above, since flexible piping (for example, polyolefin-based synthetic resin piping) is adopted as the synthetic resin pipe 1500, there is only one joint on each floor (as shown in FIG. 7, which will be described later). It is possible to realize a piping structure with On the other hand, if a pipe that does not bend (for example, a pipe made of hard vinyl chloride) is adopted as the synthetic resin pipe 1500, a pipe structure that requires at least two joints on each floor (as shown in FIG. 8 described later) becomes.

A synthetic resin pipe 1500 inserted through a through-hole provided in the slab S is provided via a space SS (separated) from a sleeve 1200 which will be described later. That is, since the mortar M is not in contact with the outer periphery of the synthetic resin pipe 1500, it is necessary to destroy the mortar M when replacing the synthetic resin pipe inserted through the through-hole provided in the slab S (details will be described later). There is no In addition, since the synthetic resin pipe 1500 inserted through the through-hole provided in the slab S is not fixed to the through-hole by the mortar M, and the space SS exists, the synthetic resin pipe 1500 is placed on the upper floor side. and the inner cylindrical surface of the sleeve 1200, a waterproof packing 1800 is provided. This water stop packing 1800 is made of rubber, for example, and prevents water leakage from the upper floor from propagating to the lower floor through the inner cylindrical surface of the sleeve 1200, or prevents water from accumulating on the inner cylindrical surface of the sleeve 1200. . For the waterproof packing 1800, a material is selected that does not generate smoke or harmful gas due to melting or the like in the event of a fire on the lower floor. Further, a synthetic resin pipe 1500 is fixed to the floor surface on the upper story side with a floor band 1700 .

This fire spread prevention device 1100 includes a thermally expandable fireproof material 1110 provided below the floor slab S so as to be in contact with the outer periphery of the synthetic resin pipe 1500, and an incombustible (for example, holding member 1120 (made of metal), and the holding member 1120 includes a connecting portion that is oscillatably connected to a cylindrical body (for example, a thin metal plate processed into a substantially hollow cylindrical shape) fixed in the through hole. characterized by

Here, the thermally expandable refractory material 1110 is a thermoplastic resin, expanded graphite, a resin composition containing zinc phosphate, a butyl rubber containing graphite, or the like, and has an expansion rate of 8 times or more when heated at 600° C. for 10 minutes. is preferred. The material and quantity (shape, size), etc. of the thermally expansible refractory material 1110 are selected so that the fire spread prevention device 1100 can fully exhibit the fire spread prevention function (also considering the diameter of the synthetic resin pipe 1500). It is determined.

Here, preferably, this cylindrical body is a sleeve 1200 fixed in the through hole with a filler (mortar M), and the lower end of a substantially hollow cylindrical portion 1210 of the sleeve 1200 is below the bottom surface of the floor slab S. , this sleeve 1200 has a collar 1220 at its lower end. Further, it is characterized by having a locking claw 1140 that locks onto the brim 1220 as the connecting portion described above. Here, the flange 1220 and the locking pawl 1140 do not need to exist in a full circle as a ring (within the range where they can be stably connected in a rocking manner), but can be formed on a part of the circumference. It may be partially present.

The outer peripheral surface of the sleeve 1200 (the surface in contact with the mortar M) is surface-treated (surface treatment such as satin finishing) so that the friction with the mortar M is high. It is preferable to prevent it from moving (shifting) not only in the direction but also in the upward direction. This is for the same reasons as in the modified example described later with reference to FIG. 1200, the lower end surface of the sleeve 1200 when inserting the synthetic resin pipe 1500 into the sleeve 1200 from the lower floor to the upper floor during construction and renewal of the piping structure 100 (the collar 1220 provided at the lower end of the sleeve 1200) This is because there is a possibility that the synthetic resin pipe 1500 pushes up the end surface of the sleeve 1200 and pushes up the sleeve 1200, so it is necessary to restrain the vertical movement of the sleeve 1200 in consideration of these possibilities.

More preferably, the holding member 1120, which is incombustible (by being made of metal, but is not limited thereto), has a substantially semi-cylindrical shape that covers the outer circumference of the thermally expandable refractory material 1110, as shown in FIG. A joint that joins two band portions 1122 in which one end of a pair of approximately semicircles is connected by a hinge 1124 and two band portions 1122 at the other end of the approximately semicircle on the opposite side , and the above-described locking pawl 1140 is provided at the upper end of the substantially semi-cylindrical shape.

More specifically, the joint includes a lower joint 1128D with a through hole 1129 and an upper joint 1128U with a through hole 1129 and a threaded hole 1130. As shown in FIG. In the direction of the white arrow shown in FIG. 2B, the band portions 1122 on the side opposite to the hinge 1124 side (joint side) are synthesized (the thermally expandable fireproof material 1110 is provided at a predetermined position). The resin pipes 1500 are brought close to each other so as to cover the resin pipes 1500, the positions of the through holes 1129 of the lower joint portion 1128D and the positions of the through holes 1129 of the upper joint portion 1128U are aligned, and the wing bolts 1126 are inserted from the lower side and screwed. By screwing it into the hole 1130, it is assembled and integrated as shown in FIG. 2(C). Employing the wing bolt 1126 preferably eliminates the need for tools.

In addition, since the fire spread prevention device according to the present invention has a configuration including the thermally expandable refractory material and the holding member, the fire spread prevention device 1100 according to the present embodiment is in a state where the thermally expandable fireproof material 1110 is set. The holding member 1120 is assembled as described above to cover the synthetic resin tube 1500 . However, the synthetic resin pipe 1500 is provided with the thermally expandable fireproof material 1110 separate from the holding member 1120, and the synthetic resin pipe 1500 provided with the thermally expandable fireproof material 1110 is covered with the holding member 1120. A fire spread prevention device 1100 may also be provided.

More preferably, the holding member 1120 may be replaced with the holding member 2120 shown in FIG. This holding member 2120 is also non-flammable (by being made of metal, but not limited thereto). Here, the holding member, one example of which is shown in FIG. It includes a pair of band portions that are assembled in a substantially cylindrical shape and a joint portion that joins N band pieces, and a locking claw is provided at the upper end of the band pieces. =2. As shown in FIG. 3, the holding member 2120 includes a pair of approximately semi-cylindrical band portions 2122 (each band piece) covering the outer periphery of the thermally expandable refractory material 1110, and these two band portions 2122. , and the locking claw 1140 described above is provided at the upper end of the substantially semi-cylindrical shape (band piece).

More specifically, in contrast to the retaining member 1120, the retaining member 2120 does not include the hinge 1124 that the retaining member 1120 includes. For this reason, the band portions 2122 facing each other are arranged in the direction of the white arrow shown in FIG. By bringing them closer together, aligning the position of the through hole 1129 of the lower joint part 1128D with the position of the through hole 1129 of the upper joint part 1128U, inserting the wing bolt 1126 from below and screwing it into the screw hole 1130. are assembled and integrated as shown in FIG. 3(C).

More preferably, instead of the holding member 1120 and the holding member 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, but not limited thereto). The holding member 3120 has a strip shape shown in FIGS. 4A to 4C, and a plurality of metal plates 3124 having a sectional shape shown in FIG. It includes a band portion formed by forming a metal plate and a joint portion 3124 that joins both ends of the band portion. As described above, the locking claws do not need to exist in a full circle as an annular ring, and may exist partially in a part of the circumference. 3124 may be provided at the upper end of part of it instead of all of it.

More specifically, both ends of the band formed by the plurality of metal plates 3124 are aligned in the direction of the white arrows shown in FIG. d) They are brought close to each other so as to cover the synthetic resin pipe 1500, and are integrated by a joint portion 3124 that joins both ends of the band portion. The joint 3124 may be a so-called snap lock (which is not limited but is made of metal and is nonflammable).
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-described configuration. Effects of such a configuration will be described later.

<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. Holding member 1120, holding member 2120, and holding member 3120, which constitute fire spread prevention device 1100 in the first embodiment described above, are swingably mounted on a tubular body (flange 1220 of sleeve 1200) fixed in a through hole. A connecting portion (locking claw 1140 or a folded portion 3140 as a locking claw) to be connected is provided only above the fire spread prevention device 1100 . A fire spread prevention device 5100 according to a second embodiment described below is provided with a connection portion (locking claw 1140) that is pivotally connected to a tubular body (flange 1220 of sleeve 1200) at its upper portion. In addition, the only difference is that a lower connecting portion (here, a lower locking claw 5140) that is pivotally connected to a pipe joint (here, a projection 2510) provided below is provided. Other than that, it is the same as the first embodiment, is given the same reference numerals, and has the same function, so it will not be described repeatedly.

Holding member 5120 constituting fire spread prevention device 5100 according to the present embodiment has a lower connection portion (here is characterized by further including a lower locking claw 5140).
More specifically, the holding member 5120 further includes a lower engaging claw 5140 at its lower end vertically symmetrically with the engaging claw 1140 provided at its upper end. This lower engaging claw 5140 is pivotably connected by being engaged with a projection 2510 provided below the fire spread prevention device 5100 . This protrusion 2510 corresponds to the above-described collar 1220 in terms of the function of swingably locking the holding member 5120 that constitutes the fire spread prevention device 5100 .

Here, in the present invention, the method of joining the synthetic resin pipes is not particularly limited, but as an example, it is assumed that the synthetic resin pipes are joined together by housing joining. For this reason, the protrusion 2510 is preferably formed on the synthetic resin pipe 2500 when the groove 1510 is formed, although it is not limited to this. Because it is preferable), the lower locking pawl 5140, which is the lower connecting portion, is described as being locked to the pipe joint (which is the housing joint portion 1600). That is, the counterpart to which the lower connecting portion of the holding member constituting the fire spread prevention device of the present invention is pivotally connected is the pipe joint (not limited to the pipe joint by housing connection). In particular, when the housing joint portion 1600 is used as a pipe joint and the groove groove 1510 is not provided by processing the outer peripheral surface of the synthetic resin pipe 1500 but is formed by a metal part or the like, It is preferable that the groove 1510 and the protrusion 2510 can be formed together on the part.

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-described configuration. Effects of such a configuration will be described later. Note that the holding member 5120 of the fire spread prevention device 5100 according to the present embodiment is configured such that the holding member 1120 constituting the fire spread prevention device 1100 described in the first embodiment further includes the lower locking claw 5140. but the first
The holding member 2120 or the holding member 3120 described in the embodiment may be configured so as to further include the lower locking claw 5140 .

<Modified Example Common to Two Embodiments>
Next, with reference to FIG. 6, a modification commonly applied to the first embodiment and the second embodiment of the present invention will be described. This modification differs only in that a sleeve 6200 having a different shape from the sleeve 1200 described in the above two embodiments is used. Other than that, it is the same as the first embodiment, is given the same reference numerals, and has the same function, so it will not be described repeatedly.

In this modification, a sleeve 6200 is employed in place of the sleeve 1200 described above. The tubular body that is the sleeve 6200 is fixed in the through hole with mortar M that is a filler, and has a projection 6212 on the outer peripheral surface of the sleeve 6200 (substantially hollow cylindrical portion 6210). For the reason described above, this convex portion suitably prevents the sleeve 6200 from being displaced in the vertical direction in the through hole. More preferably, the protruding portion 6212 is provided on the outer peripheral surface of the sleeve 6200 (of the substantially hollow cylindrical portion 6210) at the substantially central portion in the vertical direction.

Due to this projection 6212, there is a possibility that the sleeve 6200 will fall downward from the through-hole provided in the slab S, a possibility that the fire spread prevention device will rise upward and push up the sleeve 6200, and a combination during construction and renewal of this piping structure. When the resin pipe 1500 is inserted through the sleeve 6200 from the lower floor to the upper floor, the synthetic resin pipe 1500 may push up the lower end surface of the sleeve 6200 (the end surface of the collar 1220 provided at the lower end of the sleeve 6200) to push up the sleeve 6200. , can be suitably suppressed.

<Construction method and update method common to all embodiments>
Next, a construction method (construction procedure) for realizing a piping structure using the fire spread prevention device having the above-described configuration, and a method (updated state) for updating the piping in the piping structure realized by the construction method. explain.
In the following, first, referring to FIG. 7, the installation method and renewal method when the pipe is bent (for example, when a synthetic resin pipe 1500A made of polyolefin synthetic resin is adopted) will be described, and then, With reference to FIG. 8, the construction method and renewal method when the pipe does not bend (for example, when the synthetic resin pipe 1500B made of rigid vinyl chloride is adopted) will be described. 7 and 8 other than the (flexible) synthetic resin pipe 1500A and the (non-flexible) synthetic resin pipe 1500B are the same as in FIG. Since the reference numerals are the same as those in FIG. 1, the holding member 1120 is used in the following description.

7(A) and 8(A) respectively show elevation views after completion of construction, definition of one unit, one unit to be constructed, and one unit to be updated. Here, a horizontal branch pipe (including a case where the synthetic resin pipe is provided with only a horizontal branch pipe connection portion) is connected to the synthetic resin pipe arranged in the vertical direction on each floor. Regardless of the presence or absence of, in Figure 7, the piping structure is realized with only one joint (joint by joint) on each floor, and in Figure 8, the pipe structure is realized by two joints (joint by joint) on each floor. Realized. What is important in terms of construction and renewal is that the synthetic resin pipe cannot be constructed so as to pass through the through hole provided in the slab S when the lateral branch pipe is connected. 1 unit including the vertical position of the lateral branch pipe (between the lower floor slab S and the upper floor slab S, from the bottom, the pipe joint, the lateral branch pipe, and the fire spread prevention device 1100 It is preferable that one unit is formed by the synthetic resin pipes provided in order, and that the lateral branch pipe, the pipe joint, and the fire spread prevention device 1100 are not set from the bottom.

Construction Method Using Synthetic Resin Pipe 1500A (Flexible Pipe) First, as shown in FIG. At this time, the sleeve 1200 is set in the through hole provided in the slab S, and the space between the sleeve 1200 and the through hole is filled with mortar M from the upper floor. After being constructed in this manner, the lower end of the substantially hollow cylindrical portion 1210 of the sleeve 1200 is located below the lower surface of the floor slab S, and the sleeve 1200 has a flange 1220 at its lower end, so that the flange 1220 is positioned on the floor. It is positioned below the lower surface of the slab S.

Next, as shown in FIG. 7(C), for one unit to be constructed (to which the lateral branch pipe is connected), a joint damage prevention member 1502 (cap, cushioning material) is attached to the upper end of the synthetic resin pipe 1500A. etc.). The synthetic resin pipe 1500A is bent (tilted obliquely) to bend the synthetic resin pipe 1500A for this one unit, and the through hole provided in the floor slab S (more precisely, the sleeve fixed to the through hole with mortar M). 1200).
Next, as shown in FIG. 7(D), the synthetic resin pipe 1500A on the lower floor and the synthetic resin pipe 1500A to be constructed are connected (joint joint), and the lateral branch pipe of the synthetic resin pipe 1500A to be constructed is connected. Connect (joint) with the existing horizontal branch pipe on the construction target floor. The joining method here is not limited to housing joining, as described above.

Furthermore, a fire spread prevention device 1100 including a thermally expandable fireproof material 1110 and a holding 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 holding member 1120 is attached to the flange 1220 provided at the lower end of the sleeve 1200 (fixed to the through hole by the filler M) located below the lower surface of the floor slab S. Locked, retaining member 1120 is pivotally connected to sleeve 1200 . Furthermore, in the direction of the white arrow shown in FIG. ) Bring the synthetic resin pipes 1500 closer together so as to cover them, align the through hole 1129 of the lower joint 1128D with the through hole 1129 of the upper joint 1128U, and insert the wing bolt 1126 from below. 2(C), the fire spread prevention device 1100 is integrated, and the fire spread prevention device 1100 is set in the synthetic resin pipe 1500A.

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 gap (not shown) between the synthetic resin pipe 1500 and the inner cylindrical surface of the sleeve 1200 is removed. A waterproof packing 1800 is attached, and a floor band 1700 is used to fix the synthetic resin pipe 1500A.
By the construction method described above, the piping structure shown in FIG. 7A is realized.

Renewal Method Using Synthetic Resin Pipe 1500A (Flexible Piping) Next, a method for renewing the synthetic resin pipe 1500A in the piping structure realized in this way will be described.
First, as shown in FIG. 7(F), the floor band 1700 that fixes the synthetic resin pipe 1500A to be updated to the upper floor of the floor to be updated is removed, and the inner cylinder of the synthetic resin pipe 1500A and the sleeve 1200 is removed. Remove the waterproof packing 1800 attached between the surfaces. At this time, the synthetic resin pipe 1500A is not fixed to the through hole with the mortar M, and the synthetic resin pipe 1500A is 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, the mortar M is destroyed when the synthetic resin pipe 1500A inserted through the through-hole provided in the slab S is renewed. No need.

Next, as shown in FIG. 7(G), the connection between the synthetic resin pipe 1500A on the upper floor and the synthetic resin pipe 1500A on the lower floor and the synthetic resin pipe 1500A to be updated is released (the state joined by the joint is released). ), and disconnect the lateral branch pipe of the synthetic resin pipe 1500A to be constructed from the existing lateral branch pipe of the floor to be updated (disconnect the jointed state by the joint). Furthermore, the fire spread prevention device 1100 is removed from the synthetic resin pipe 1500A to be constructed. Since the joining method is not limited as described above, the unjoining method is also not limited. It will be. On the other hand, in the case where the synthetic resin pipe 1500A is detachably joined including the housing joint, for example, by releasing the fastening of the fastening member 1620 of the housing joint 1600, the state of being joined by the joint. can be easily released.

Next, as shown in FIG. 7(H), the synthetic resin pipe 1500A is warped (tilted obliquely) by bending the synthetic resin pipe 1500A for one unit to be updated (unjoined) to the floor slab. It is pulled out from a through hole provided in S (more precisely, a sleeve 1200 fixed to the through hole with mortar M). At this time, the sleeve 1200 is kept fixed to the through hole provided in the slab S with the mortar M. As shown in FIG. Then, prepare a new synthetic resin pipe 1500A for renewal, and use the construction method described with reference to FIGS. By constructing the pipe 1500A, the synthetic resin pipe 1500A of the floor to be renewed can be renewed without destroying the mortar M of the floor slab S.

・Construction method using synthetic resin pipe 1500B (piping that does not bend) Next, the construction method when synthetic resin pipe 1500B made of hard vinyl chloride is adopted instead of synthetic resin pipe 1500A made of polyolefin synthetic resin. and the update method will be described with reference to FIG. Regarding the construction method and the renewal method when the synthetic resin pipe 1500B is adopted, only the differences from the construction method and the renewal method described above when the synthetic resin pipe 1500A is adopted will be explained. Specifically, description will be made with reference to FIGS. 8(C) and 8(H). Regarding the definition of 1 unit itself and 1 unit to be constructed and updated, 1 unit shown in FIG. 8 is shorter than 1 unit shown in FIG. 7, and 1 unit shown in FIG. One unit shown in FIG. 8 is limited within one layer.

As shown in FIG. 8C, after the synthetic resin pipe 1500B on the lower floor and the synthetic resin pipe 1500B to be constructed are installed so as to be connectable (joint joint), the synthetic resin pipe 1500B on the upper floor is connected to the floor slab. The synthetic resin pipe 1500B on the upper floor and the synthetic resin pipe 1500B to be constructed are connected (joint joint ) are installed as possible (installed so that connection (joint joint) is possible in order from bottom to top in FIG. 8(D)).

・Updating method using synthetic resin pipe 1500B (piping that does not bend) As shown in FIG. The resin pipe 1500B is moved laterally. After that, the synthetic resin pipe 1500B on the upper floor is extracted from the through-hole provided in the floor slab S (more precisely, the sleeve 1200 fixed to the through-hole with mortar M). At this time, the sleeve 1200 is kept fixed to the through hole provided in the slab S with the mortar M. As shown in FIG. Then, a new synthetic resin pipe 1500B for one unit is prepared for renewal, and the construction method described with reference to FIGS. By constructing the synthetic resin pipe 1500B for one unit, the synthetic resin pipe 1500B of the update target floor can be renewed without destroying the mortar M of the floor slab S.

<Action and effect of the fire spread prevention device and piping structure according to the embodiment described above>
According to the fire spread prevention device and the piping structure having the configurations described above, the following effects are obtained.
(1) Even if there is an abnormality in the synthetic resin pipe and it needs to be renewed, or if there is no abnormality but it needs to be renewed due to deterioration over time, the through hole provided in the floor slab S is buried. The synthetic resin pipes inserted through the through-holes provided in the floor slab S can be repeatedly replaced (renewed) without destroying the mortar M.
(2) The fire spread prevention device is composed of a holding member and a thermally expansive refractory material integrally constructed, and the upper portion (locking claw 1140) is rockably locked to the brim of the sleeve. Since the lower portion (lower locking claw 5140) is locked to the joint in a swingable manner, there is no need for prior confirmation such as measurement of mounting height, and the joint can be securely mounted at a predetermined position without individual differences. Is possible.
(3) Since the fire spread prevention device is supported so that its upper portion is swingable with the sleeve and its lower portion is swingably supported with the pipe joint, the fire spread prevention device follows thermal expansion and contraction. , it is possible to follow the tremors of an earthquake or the like, prevent stress from concentrating on the synthetic resin pipe, and form a fireproof compartment area.
(4) The fire spread prevention device is supported so that its upper part is swingably supported by the sleeve, and its lower part is supported by the pipe joint so that it is swingably supported (the axial position is held swingably). Therefore, it is possible to reliably prevent sagging due to thermal expansion and contraction of the synthetic resin pipe or sagging due to the weight of the synthetic resin pipe.

As described above, according to the fire spread prevention device and the piping structure using the fire spread prevention device according to the present embodiment, the through holes formed in the floor slab of the building can be easily renewed. It is possible to provide a fire spread prevention device for a synthetic resin pipe inserted through a pipe and a piping structure using the fire spread prevention device.
It should be noted that the embodiments disclosed this time should be considered as examples in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the meaning and range of equivalents of the scope of the claims.

INDUSTRIAL APPLICABILITY The present invention is suitable for fire spread prevention technology used when flammable synthetic resin pipes are inserted through through-holes formed in a floor slab in a fire prevention compartment area, and renewal of synthetic resin pipes. At the same time, the thermally expandable refractory material provided below the floor slab expands due to the heat generated by the fire, allowing flames and harmful gases to flow into the upper floors through the through holes. It is particularly preferable in that it can prevent this.

REFERENCE SIGNS LIST 100, 200 Piping structure 1100, 5100 Fire spread prevention device 1110 Thermally expandable refractory material 1120, 2120, 3120, 5120 Holding member 1500 Synthetic resin pipe 1600 Housing joint 1700 Floor band 1800 Waterproof packing

Claims (9)

A fire spread prevention device for a synthetic resin pipe inserted through 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 the outer periphery of the synthetic resin pipe;
and a nonflammable holding member that restrains the outer periphery of the thermally expandable refractory material,
The fire spread prevention device, wherein the holding member includes a connecting portion that is pivotably connected to a cylindrical body that is fixed to the through hole. The cylindrical body is a sleeve fixed to the through-hole with a filler material, the lower end of the sleeve is positioned below the lower surface of the floor slab, the sleeve is provided with a flange at the lower end,
2. The fire spread prevention device according to claim 1, wherein the connecting portion has a locking pawl that locks onto the flange. The holding member includes two substantially semi-cylindrical band portions covering the outer periphery of the thermally expandable refractory material, and a pair of substantially semi-circular band portions each having one end thereof connected by a hinge, and a band portion opposite to the one. and a joint that joins the two band portions at the other end of the approximately semicircle of
3. The fire spread prevention device according to claim 2, wherein the locking pawl is provided at the upper end of the substantially semi-cylindrical shape. The holding member includes N band pieces covering the outer periphery of the thermally expandable refractory material divided into N pieces in the circumferential direction, and the N band portions assembled in a pair into a substantially cylindrical shape; a joint that joins the band pieces;
3. A fire spread prevention device according to claim 2, wherein said locking pawl is provided at the upper end of said band piece. The holding member is formed in a plurality of strip shapes, and includes a band portion that covers the outer periphery of the thermally expandable refractory material with the inner peripheral side of the strip shape, and a joint portion that joins both ends of the band portion,
3. The fire spread prevention device according to claim 2, wherein said locking pawl is provided at an upper end of said strip shape. 6. The holding member according to any one of claims 1 to 5, wherein the holding member further includes a lower connecting portion swingably connected to a pipe joint provided below the fire spread prevention device. Fire spread prevention device. A piping structure using the fire spread prevention device according to any one of claims 1 to 6. The cylindrical body is a sleeve fixed to the through-hole by a filler, and has a convex portion on an outer peripheral surface of the sleeve to prevent the sleeve from being displaced in the through-hole. Item 7. The piping structure according to Item 7. 9. The piping structure according to claim 8, wherein the convex portion is provided on an outer peripheral surface of the sleeve at a substantially central portion in the vertical direction.

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