JP2015152067A - Refractory pipe body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refractory pipe body easily preventing heat from transferring from outward of the refractory pipe body to a thermal expansion material.SOLUTION: A refractory pipe body 11 includes a resin pipe body 21, and a thermal expansion material 31 thermally expanding by heating in fire. The thermal expansion material 31 is arranged along the inner peripheral surface of the resin pipe body 21. The refractory pipe body 11 is connected to a partition part penetration pipe 91 having refractory. The refractory pipe body 11 preferably includes a resin protective member 41 protecting the thermal expansion material 31. The resin protective member 41 has a body part 42 covering the inner peripheral surface of the thermal expansion material 31.

Description

  The present invention relates to a refractory tube.

  A building such as an apartment house or a building has a structure that is partitioned by a fire-resistant partition so that the spread of fire during a fire is suppressed. For example, a partition through pipe for drainage is disposed in the partition. In order to suppress the spread of fire at the time of a fire, the compartment through pipe has fire resistance, but there is a risk that flame, smoke, gas, etc. may circulate in the flow path of the compartment through pipe. is there. In order to suppress such distribution, a technique using a thermal expansion material that thermally expands by heating in a fire is known (see Patent Document 1). In patent document 1, the structure by which the thermal expansion material was arrange | positioned on the outer periphery of the resin-made standing pipe (resin-made pipe body) connected with a division part through-pipe is disclosed. According to this configuration, in the event of a fire, the thermal expansion material is thermally expanded, whereby a part or the whole of the opening of the partitioning portion through pipe is closed. This makes it difficult for flames, soot, gas, and the like at the time of a fire to flow through the flow path of the partitioning portion through pipe.

JP 2010-236677 A

  By the way, in the event of a fire, if the thermal expansion of the thermal expansion material starts excessively earlier than the softening of the resin tube body, the thermal expansion of the thermal expansion material is performed when the thermal expansion material thermally expands toward the opening of the partition portion through pipe. Is hindered by the resin tube. When the thermal expansion material is provided on the outer periphery of the resin pipe body connected to the partitioning portion through pipe described above, the heat expansion from the outside is easily transferred to the thermal expansion material. It tends to be earlier than the start of softening of the body.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a fire-resistant tube that can easily suppress heat transmitted from the outside of the fire-resistant tube to the thermal expansion material. .

  A fire-resistant tube that solves the above problems is a fire-resistant tube that is used in connection with a fire-resistant partition through-tube, and is a resin tube and a thermal expansion material that is thermally expanded by heating during a fire The thermal expansion material is disposed along the inner peripheral surface of the resin pipe body.

According to this structure, the heat from the outside of the fireproof pipe is transmitted to the thermal expansion material via the resin pipe.
It is preferable that the fire-resistant tubular body further includes a resin protective member that protects the thermal expansion material, and the resin protection member has a main body that covers an inner peripheral surface of the thermal expansion material.

  In the refractory tube in which the thermal expansion material is arranged along the inner peripheral surface of the resin tube, for example, when the thermal expansion material is connected to the partition portion through pipe, the thermal expansion material easily comes into contact with the partition portion through pipe. . In this regard, as described above, the fireproof tube includes a resin protective member, and the resin protective member has a main body that covers the inner peripheral surface of the thermal expansion material. Contact between the thermal expansion material and the partitioning portion through pipe when the refractory tube is connected to the partitioning portion through pipe is suppressed.

It is preferable that the refractory tube is connected to the partition portion through pipe so that at least a part of the thermal expansion material is disposed between the partition portion through pipe and the resin tube body.
Thus, the movement of the thermal expansion material in the radial direction of the resin pipe body is suppressed by arranging the thermal expansion material between the partition part through pipe and the resin pipe body.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes easy to suppress the heat | fever transmitted from the outer side of a refractory tube to a thermal expansion material.

The half sectional view showing the fireproof tube in an embodiment. The half sectional view showing typically the state where the refractory tube was heated. The half sectional view showing the fireproof tube in the example of change.

Hereinafter, an embodiment of a fireproof tube applied to the partitioning portion through pipe will be described with reference to FIGS. 1 and 2.
<Partition section>
As shown in FIG. 1, the partition part penetration pipe | tube 91 which has fire resistance is arrange | positioned in the partition part 81 which a building has. The partition part 81 has a floor slab 82 having a through hole, and an embedded part 83 between the inner wall of the through hole and the partition part through pipe 91. The floor slab 82 is made of, for example, concrete, and the buried portion 83 is made of, for example, mortar. The partition part penetration pipe | tube 91 comprises the drainage system of a building. As the division part penetration pipe | tube 91, the refractory joint pipe made from cast iron, and a fireproof double layer pipe (fiber reinforced mortar double layer pipe) are mentioned, for example. The partition part penetration pipe | tube 91 of this embodiment is comprised from the refractory joint pipe made from cast iron. The partition part through pipe 91 may have a flow path only in the vertical direction, or may have a branch pipe part that forms a flow path in the horizontal direction above the floor slab 82.

<Fireproof tube>
The refractory tube 11 is used by being connected to the partition through pipe 91. The fire-resistant tubular body 11 includes a resin tubular body 21 and a thermal expansion material 31 that thermally expands due to heating during a fire. The thermal expansion material 31 is disposed along the inner peripheral surface of the resin tubular body 21.

  The resin pipe body 21 has a first connection part 22 connected to the partitioning part through pipe 91 and a second connection part 23 connected to the standing pipe 92. The first connecting part 22 is connected to the partition part through pipe 91 by being fitted around the lower end part of the partition part through pipe 91. The second connecting portion 23 is connected to the standing tube 92 by being externally fitted to the upper end portion of the standing tube 92. The resin pipe body 21 and the standing pipe 92 are formed from a resin material having flame retardancy. The resin pipe body 21 and the standpipe 92 of the present embodiment are formed from hard vinyl chloride resin. The 2nd connection part 23 and the standpipe 92 are adhere | attached using an adhesive agent, for example.

  The thermal expansion material 31 preferably contains expanded graphite that is thermally expanded by external heating and a shape stabilizer that stabilizes the shape of the expanded graphite after thermal expansion. For example, boric acid can be used as the shape stabilizer. The blending amount of the shape stabilizer with respect to the expanded graphite is preferably 120 parts by mass or less of the shape stabilizer with respect to 100 parts by mass of the expanded graphite, and 110 parts by mass or less of the shape stabilizer with respect to 100 parts by mass of the expanded graphite. More preferably. The blending amount of the shape stabilizer with respect to the expanded graphite is preferably 70 parts by mass or more with respect to 100 parts by mass of the expanded graphite. The thermal expansion material 31 may contain an inorganic filler, for example. The total amount of the expanded graphite and the shape stabilizing material is preferably 80% by mass or more, and more preferably 90% by mass or more when the entire thermal expansion material 31 is 100% by mass.

  As the thermal expansion material 31, it is preferable to use a powder containing a powder of expanded graphite and a powder of a shape stabilizing material from the viewpoint that a volume of thermal expansion is easily obtained. In this case, for example, from the viewpoint of facilitating the arrangement of the thermal expansion material 31, the thermal expansion material 31 is preferably covered with a water resistant layer including a resin film such as a polyethylene film. The water-resistant layer is formed, for example, in a bag shape, and the thickness of the water-resistant layer is preferably in the range of, for example, 15 μm or more and 200 μm or less.

  When the thermal expansion material 31 is heated from the outside to a predetermined temperature or higher, the volume of the thermal expansion material 31 becomes several to several hundred times due to the action of the expanded graphite. The thermal expansion material 31 is a refractory material, and the thermal expansion material 31 after thermal expansion exhibits a heat insulating effect as well as a physical shielding effect.

  The expansion ratio of the expanded graphite used for the thermal expansion material 31 is preferably 100 times or more, and more preferably 200 times or more. The expansion ratio of expanded graphite is determined from the volume change when 1 g of expanded graphite is heated at 900 to 1000 ° C. for 5 minutes. In addition, although the upper limit of the expansion ratio of the expanded graphite used for the thermal expansion material 31 is not specifically limited, For example, it will be less than 1000 times.

  In addition, as the thermal expansion material 31, it is also possible to use a commercially available product called by a name such as a thermal expansion refractory material or a thermal expansion heat resistant material. The heat-expandable refractory material and the heat-expandable heat-resistant material contain, for example, base materials such as natural rubber, synthetic rubber, and thermoplastic elastomer, thermal expansion components such as expanded graphite, and inorganic fillers.

  The thermal expansion material 31 arranged in the resin pipe body 21 may be composed of a single member or a plurality of members. The thermal expansion material 31 may be composed of, for example, a plurality arranged along the circumferential direction of the resin tubular body 21.

  The refractory tube 11 is further provided with a resin protective member 41 that protects the thermal expansion material 31. The resin protection member 41 includes a main body portion 42 that covers the inner peripheral surface of the thermal expansion material 31, a first protrusion portion 43 that protrudes toward the resin tube body 21, and a second protrusion portion 44. The thermal expansion material 31 is disposed between the first protrusion 43 and the second protrusion 44. The first protrusion 43 covers the upper surface of the thermal expansion material 31, and the second protrusion 44 is disposed so as to cover the lower surface of the thermal expansion material 31.

  The resin material constituting the resin protection member 41 is not particularly limited as long as it is softened when the thermal expansion material 31 is thermally expanded. As a resin material constituting the resin protection member 41, for example, an olefin resin such as polyethylene or polypropylene can be used. The thickness of the resin protective member 41 is preferably in the range of 0.5 mm or more and 4 mm or less, for example.

  The thermal expansion material 31 and the resin protection member 41 are disposed in a recess having an L-shaped cross section formed on the inner peripheral surface of the resin tube body 21. As shown in an enlarged view in FIG. 1, the bottom surface (lower surface) of the concave portion of the resin tubular body 21 constitutes a movement restricting portion 24 that restricts the downward movement of the thermal expansion material 31 and the resin protective member 41. ing.

Next, details of the arrangement of the thermal expansion material 31 will be described.
The refractory tube 11 has a configuration connected to the partition through pipe 91 so as to satisfy the following condition A or condition B when the position of 15 mm upward from the lower end of the partition through pipe 91 is used as a reference. Is preferred.

Condition A: The lower end of the thermal expansion material 31 is the reference position.
Condition B: The lower end of the thermal expansion material 31 is below the reference position.
Describing in detail based on the cross-sectional view enlarged in FIG. 1, the refractory tube 11 has the partition portion so that the dimension L from the lower end of the partition portion through-tube 91 to the lower end of the thermal expansion material 31 is 15 mm or less. It is preferable to have a configuration connected to the through pipe 91.

The reference position is more preferably 10 mm or less, and further preferably 5 mm or less. In addition, each dimension of drawing is exaggerated as needed.
It is preferable that the refractory tube 11 is connected to the partition portion through pipe 91 so that at least a part of the thermal expansion material 31 is disposed between the partition portion through pipe 91 and the resin tube body 21. The refractory tube 11 of the present embodiment is connected to the partition portion through pipe 91 so that the entire thermal expansion material 31 is disposed between the partition portion through pipe 91 and the resin tube body 21.

The refractory tube 11 of the present embodiment further has the following configuration.
A rubber seal member 51 is provided on the first connecting portion 22 of the resin tube body 21. The seal member 51 is disposed along the inner peripheral surface of the first connecting portion 22, and the first connecting portion 22 is fitted on the lower end portion of the partitioning portion through-tube 91, thereby allowing the inner periphery of the first connecting portion 22. The surface and the outer peripheral surface of the partitioning portion through pipe 91 are sealed by the sealing member 51.

  A coating material 61 is provided on the outer periphery of the resin tube body 21. The covering material 61 includes an inorganic fiber layer 62 having air permeability and fire resistance and a non-air-permeable layer 63. The covering material 61 has a laminated structure in which an inorganic fiber layer 62, a non-breathing layer 63, and an inorganic fiber layer 62 are laminated in order from the resin tubular body 21 side.

Examples of the inorganic fibers constituting the inorganic fiber layer 62 include glass fibers, silica fibers, alumina fibers, ceramic fibers, metal fibers, mineral fibers, alumina fibers, and carbon fibers. The inorganic fiber layer 62 is composed of a woven fabric or a non-woven fabric. The heat resistant temperature of the inorganic fiber layer 62 is preferably 700 ° C. or higher, more preferably 800 ° C. or higher, and further preferably 900 ° C. or higher. The density of the inorganic fiber layer 62 is preferably in the range of ^{30 to} 250 kg / m ³ . The thickness of the inorganic fiber layer 62 is preferably in the range of 2 to 15 mm.

  The non-breathing layer 63 is formed from a material containing a base material made of a polymer material and an inorganic filler. Examples of the polymer material include at least one selected from synthetic resins, elastomers, and rubbers. Examples of synthetic resins include olefin resins, acrylic resins, and styrene resins. Examples of the elastomer include an olefin elastomer and a urethane elastomer. Examples of the rubber include acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), and butyl rubber. Among polymer materials, it is easy to be deformed into a shape along the outer periphery of the resin tubular body 21 by imparting flexibility, and therefore at least one selected from elastomers and rubbers may be used. preferable.

  Examples of the inorganic filler include barium sulfate, calcium carbonate, talc, magnesium oxide, alumina, titanium oxide, barite, iron powder, zinc oxide, and graphite. The content of the inorganic filler is preferably in the range of 50 to 85 parts by mass with respect to 100 parts by mass of the polymer material.

The non-breathing layer 63 may contain additives such as a plasticizer, an antioxidant, and an adhesive as necessary. The thickness of the non-breathing layer 63 is preferably in the range of 0.5 to 5 mm.
<Fireproof structure>
The fireproof structure has a configuration in which the fireproof tubular body 11 is connected to the partitioning portion through pipe 91. That is, the fireproof structure includes a floor slab 82 that constitutes a partition 81 of the building, a partition through pipe 91 that is disposed through the floor slab 82, and the fireproof tube 11. The fireproof structure of the present embodiment includes a metal support 64 that supports the covering material 61 on the floor slab 82. The support tool 64 includes a holding portion 65 that holds the covering material 61 and a support portion 66 that supports the holding portion 65 on the floor slab 82. The holding part 65 is formed in a continuous annular shape. The holding part 65 has an opening / closing part that can engage and disengage at least a part in the circumferential direction, and can be mounted from the radial direction of the covering material 61. In the support tool 64, after fixing one end of the support part 66 to the floor slab 82, at least a part of the support part 66, or the holding part 65 and the support part 66 are connected by a connecting tool such as a bolt and a nut. It is installed by. As a metal which comprises the support tool 64, iron, aluminum, and stainless steel are mentioned, for example.

<Action>
Next, the operation of the refractory tube 11 will be described.
The refractory tube 11 is connected to the partition through pipe 91 by being externally fitted to the partition through pipe 91. Here, in the refractory tube 11 in which the thermal expansion material 31 is disposed along the inner peripheral surface of the resin tubular body 21, for example, when the thermal expansion material 31 is connected to the partition portion through pipe 91, the thermal expansion material 31 is partitioned. It becomes easy to contact the part through-tube 91. In this regard, the fireproof tube 11 of the present embodiment includes a resin protective member 41, and the resin protective member 41 includes a main body 42 that covers the inner peripheral surface of the thermal expansion material 31. . For this reason, the contact of the thermal expansion material 31 and the partition part penetration pipe 91 at the time of connecting the refractory tube 11 to the partition part penetration pipe 91 is suppressed. Further, for example, when the refractory tube 11 is transported, the inner peripheral surface of the thermal expansion material 31 is protected, so that the inner peripheral surface of the thermal expansion material 31 is hardly damaged.

  The fireproof tube 11 (fireproof structure) connected to the partition through pipe 91 is heated in the event of a fire. At this time, the thermal expansion material 31 of the refractory tube 11 is arranged along the inner peripheral surface of the resin tube 21. For this reason, the heat from the outside of the refractory tube 11 is transmitted to the thermal expansion material 31 through the resin tube 21.

  As shown in FIG. 2, in the fireproof pipe after being heated at the time of the fire, the resin pipe 21 is thermally deformed and the thermal expansion material 31 is thermally expanded, so that the lower end of the partition through pipe 91 is All or part of the opening is closed. That is, the whole or part of the opening of the lower end of the partitioning portion through pipe 91 is blocked by the residue 71 obtained by thermally decomposing the resin pipe body 21 and the product 72 generated from the thermal expansion material 31.

The effects exhibited by this embodiment will be described below.
(1) The thermal expansion material 31 included in the fire-resistant tubular body 11 is disposed along the inner peripheral surface of the resin tubular body 21. According to this configuration, heat from the outside of the refractory tube 11 is transmitted to the thermal expansion material 31 via the resin tube 21. Thereby, it becomes easy to suppress the heat transmitted from the outside of the refractory tube 11 to the thermal expansion material 31.

  Therefore, for example, when the thermal expansion material 31 is thermally expanded toward the opening of the partitioning portion through pipe 91 by heat from the outside of the refractory pipe body 11, the resin pipe body 21 is easily sufficiently softened. That is, when the thermal expansion material 31 is thermally expanded toward the opening of the partitioning portion through pipe 91, the thermal expansion is hardly hindered by the resin pipe body 21. For this reason, the opening of the partition through pipe 91 is preferably easily closed by the product 72 generated from the thermal expansion material 31.

  (2) The fireproof tubular body 11 includes a resin protective member 41, and the resin protective member 41 includes a main body 42 that covers the inner peripheral surface of the thermal expansion material 31. Thereby, since the internal peripheral surface of the thermal expansion material 31 is protected suitably, the function of the thermal expansion material 31 becomes easy to be maintained.

(3) The refractory tube 11 may be connected to the partition portion through pipe 91 so that at least a part of the thermal expansion material 31 is disposed between the partition portion through pipe 91 and the resin tube body 21. preferable.
As described above, the thermal expansion material 31 is disposed between the partitioning portion through pipe 91 and the resin pipe body 21, thereby suppressing the movement of the thermal expansion material 31 in the radial direction of the resin pipe body 21. .

  (4) The fire-resistant tubular body 11 has a configuration in which the fire-resistant tubular body 11 is connected to the partition portion through pipe 91 by being externally fitted to the lower end portion of the partition portion through pipe 91. Such a refractory tube 11 is such that the lower end of the thermal expansion material 31 is lower than the reference position or the reference position when the position of 15 mm upward from the lower end of the partition through pipe 91 is used as a reference. It is preferable to have a configuration connected to the partitioning portion through pipe 91.

  As described above, the thermal expansion material 31 is arranged close to the opening of the lower end of the partitioning portion through-tube 91, so that the opening of the lower end of the partitioning portion through-pipe 91 is more easily blocked in a fire. Become.

  (5) The refractory tube 11 is connected to the partition through pipe 91 by being fitted around the lower end of the partition through pipe 91, and the resin tube 21 is made of the thermal expansion material 31. It has a movement restricting section 24 that restricts downward movement. According to this configuration, the thermal expansion material 31 is easily held in a predetermined position until a fire.

  (6) The resin protection member 41 has a second protrusion 44 that protrudes toward the resin tube 21, and the second protrusion 44 is disposed between the movement restricting portion 24 and the thermal expansion material 31. Has been. According to this configuration, the displacement of the thermal expansion material 31 and the resin protection member 41 is suppressed, and the thermal expansion material 31 and the resin protection member 41 are easily held at predetermined positions until the time of a fire.

(Example of change)
In addition, the said embodiment can also be changed and comprised as follows.
As shown in FIG. 3, the refractory tube 11 can also be connected to the partition through pipe 91 such that the lower end of the thermal expansion material 31 is positioned below the lower end of the partition through pipe 91. . Further, in the refractory tube 11, the relative position between the partitioning portion penetration pipe 91 and the thermal expansion material 31 may be changed by changing the position of the thermal expansion material 31.

  The thermal expansion material 31 may be divided into upper and lower parts. In this case, the lower end of the thermal expansion material 31 means the lower end of the thermal expansion material 31 located at the lowest position. In addition, among the thermally expandable materials 31 divided in this way, a part of the uppermost thermally expandable material 31 is disposed between the partition through pipe 91 and the resin tubular body 21. By being connected to the partitioning portion through pipe 91, movement of the resin tubular body 21 in the radial direction is suppressed with respect to the uppermost thermal expansion material 31.

  -In the resin-made pipe body 21 shown expanded in FIG. 1, the shape of the insertion part of the division part penetration pipe | tube 91 can also be changed as follows. That is, the lower end of the partition part through-pipe 91 is disposed below the movement restricting part 24 by further providing a recess in which the lower end part of the partition part through-pipe 91 is disposed on the bottom surface of the recess of the resin tubular body 21. May be modified as desired.

The resin protective member 41 may be omitted.
The resin protection member 41 may be composed of only the main body portion 42, or may be composed of the main body portion 42 and one of the first projecting portion 43 and the second projecting portion 44.

  The main body 42 constituting the resin protection member 41 may be configured to partially cover the inner peripheral surface of the thermal expansion material 31. The first protrusion 43 constituting the resin protection member 41 may also be configured so as to partially cover the upper surface of the thermal expansion material 31, and the second protrusion 44 may also be configured of the thermal expansion material 31. It may be configured to partially cover the lower surface.

  The covering material 61 may be omitted. In this case, the residue 71 obtained by thermally decomposing the resin pipe body 21 is less likely to remain in the vicinity of the opening of the lower end of the partition through pipe 91, but the product 72 generated from the thermal expansion material 31 causes the partition through pipe 91 to A part or the whole of the opening of the lower end is closed.

-The support 64 may be omitted. In this case, an adhesive layer is preferably provided between the layers of the covering material 61 and between the resin tubular body 21 and the covering material 61.
-Although the holding | maintenance part 65 which comprises the said support tool 64 is formed in the continuous cyclic | annular form, you may be formed in the discontinuous cyclic | annular form.

The support tool 64 supports the covering material 61 on the floor slab 82, but may be changed so that the covering material 61 is supported by the partitioning portion through pipe 91.
In the refractory tube 11, the position of the second connecting portion 23 is not limited to the above embodiment. That is, the resin pipe body 21 of the fireproof pipe body 11 may be changed to a resin pipe body that extends downward, and the second connection portion 23 may be formed at the lower end portion thereof.

-The resin pipe 21 may be formed of, for example, an olefin resin having flame retardancy.
The refractory tube 11 may be changed so as to be fitted in the partitioning portion through pipe 91. Further, the refractory tube 11 may be modified so as to be fitted in the standpipe 92.

The floor slab 82 is not limited to concrete but may be formed of a stone plate or the like.
-Although the said refractory tube 11 and the fireproof structure are applied to the division part 81 divided along a horizontal direction, you may apply to the division part divided along a vertical direction, for example. In this case, instead of the vertical tube 92, a flame retardant resin horizontal tube is connected to the second connecting portion 23.

The refractory tube 11 and the refractory structure are applied to a drainage system, but may be applied to a ventilation system.
Next, the technical idea that can be grasped from the embodiment and the modified examples will be described below.

  (A) The fire-resistant pipe body is configured to be connected to the partition part through pipe by being externally fitted to the lower end part of the partition part through pipe, and 15 mm upward from the lower end of the partition part through pipe. Refractory tube connected to the partitioning portion through pipe so that the lower end of the thermal expansion material is lower than the reference position or the reference position.

  (B) In the fire-resistant tube, the fire-resistant tube is externally fitted to a lower end portion of the partition-part through pipe and connected to the partition-part through pipe, and the resin tube Is a refractory tube having a movement restricting portion for restricting the downward movement of the thermal expansion material.

  (C) In the fire resistant tube, the resin protective member protrudes toward the resin tube and has a protrusion disposed between the movement restricting portion and the thermal expansion material. Fireproof tube.

  (D) A fire-resistant structure having a structure in which the fire-resistant tubular body and a fire-resistant partition through pipe are connected.

  DESCRIPTION OF SYMBOLS 11 ... Fireproof pipe body, 21 ... Resin pipe body, 31 ... Thermal expansion material, 41 ... Resin protective member, 42 ... Main-body part, 91 ... Partition part penetration pipe | tube.

Claims (3)

A fire-resistant tube used in connection with a fire-resistant compartment through pipe,
It has a resin tube and a thermal expansion material that expands by heating during a fire,
The said heat expansion material is arrange | positioned along the internal peripheral surface of the said resin-made tubular bodies, The fireproof tubular body characterized by the above-mentioned.   The fireproof tube according to claim 1, further comprising a resin protection member that protects the thermal expansion material, wherein the resin protection member has a main body portion that covers an inner peripheral surface of the thermal expansion material.   The said fireproof pipe body is connected to the said partition part penetration pipe | tube so that at least one part of the said thermal expansion material may be arrange | positioned between the said partition part penetration pipe | tube and the said resin-made pipe bodies. Item 3. The fire-resistant tube according to Item 2.