JP6158557B2 - Fireproof structure - Google Patents

Description

  The present invention relates to a fireproof structure.

  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. Such a partition part may be formed with, for example, a through-hole through which a drain pipe passes. In order to suppress the spread of fire through a through hole, a technique using a thermal expansion material that thermally expands by heating at the time of a fire is known (see Patent Document 1). The fireproof member for piping of Patent Document 1 has a valve body that swings inward as the thermal expansion material expands. And at the time of a fire, the flow of flame, smoke, gas, etc. in a through-hole is suppressed because the flow path which penetrates a through-hole partly or entirely is obstruct | occluded with a thermal expansion material and a valve body.

JP 2010-236677 A

  By using a cast iron refractory joint pipe for a pipe portion penetrating a partition portion of a building, durability of the pipe portion can be improved. In a structure in which a flame-resistant resin pipe is connected to such a fire-resistant joint pipe, it is possible to suppress passage of flame, smoke, gas, etc. to the flow path of the fire-resistant joint pipe, and to penetrate the compartment There is still room for improvement in terms of improving the fire resistance of parts.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a fire-resistant structure that can easily improve the fire resistance of a partition penetration portion through which a fire-resistant joint pipe made of cast iron is disposed. There is.

A fireproof structure that solves the above problem is a fireproof structure in which a fireproof pipe is connected to a fireproof joint pipe made of cast iron that is disposed through a partition of a building up and down . The pipe body has a flame-retardant resin pipe main body and a covering material provided on the outer periphery of the pipe main body, and the pipe main body is connected with the fireproof joint pipe inserted therein. A connecting portion and a second connecting portion connected by inserting a flame-resistant resin standpipe, and the covering material includes an inorganic fiber layer having fire resistance, and the covering material A support device is provided that supports the partition portion or the fireproof joint pipe, and the support device includes a wall portion that is disposed along a lower end surface of the covering material, and the wall portion is provided under the tube body. It protrudes to a position that overlaps the end face .

  According to this configuration, since the support member for supporting the covering material on the partition part or the refractory joint pipe is provided, the positional deviation of the covering material with respect to the pipe body, that is, the positional deviation of the covering material with respect to the refractory joint pipe is suppressed for a long time. It is possible. Moreover, the heat conduction to the outer periphery of a pipe | tube main body is suppressed by the inorganic fiber layer which has fire resistance.

About the said fireproof structure, it is preferable that the said support has a shape which covers the whole outer peripheral surface of the said coating | covering material.
According to this structure, it is avoided that a hot air hits the outer peripheral surface of a coating | covering material directly. This makes it difficult for softening and thermal decomposition of the tube main body during a fire, and the flame-retardant resin constituting the tube main body is likely to remain inside the coating material.

About the said fireproof structure, it is preferable that the said inorganic fiber layer has air permeability, and the said support has a shape which covers the whole end surface of the said inorganic fiber layer.
According to this configuration, intrusion of hot air from the end face of the inorganic fiber layer is suppressed. This makes it difficult for softening and thermal decomposition of the tube main body during a fire, and the flame-retardant resin constituting the tube main body is likely to remain inside the coating material.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes easy to improve the fire resistance of the division | segmentation penetration part by which the refractory joint pipe made from cast iron is penetrated.

Sectional drawing which shows the fireproof structure in embodiment. Sectional drawing which shows typically the state by which the fireproof tubular body was heated. Explanatory drawing explaining the test method of fire resistance.

Hereinafter, an embodiment of a fireproof structure will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the fireproof structure has a configuration in which a fireproof pipe body 11 is connected to a fireproof joint pipe 61 made of cast iron and disposed through a floor slab 71 of a building. That is, the fireproof structure includes a floor slab 71 as a partition part of the building, a fireproof joint pipe 61 disposed through the floor slab 71, and the fireproof pipe body 11. Piping which the fireproof structure of this embodiment has constitutes a building drainage system.

<Fireproof joint pipe>
The refractory joint pipe 61 is inserted into a through hole 72 formed in the floor slab 71. The floor slab 71 is made of concrete, and the refractory joint pipe 61 is fixed to the floor slab 71 by filling a space between the fireproof joint pipe 61 and the inner wall of the through hole 72 with a mortar 73. The refractory joint pipe 61 may have a flow path only at the top and bottom, or may have a branch pipe portion that forms a flow path along the lateral direction above the floor slab 71.

<Fireproof tube>
The refractory tube 11 has a resin tube main body 12 having flame retardancy. The pipe body 12 includes a first resin joint pipe 13 and a second resin joint pipe 14 connected to the first resin joint pipe 13.

  The 1st resin joint pipe 13 has the 1st connection part 15 to which the fireproof joint pipe 61 is connected. The 1st connection part 15 has the insertion part 15a in which the edge part of the fireproof joint pipe 61 is inserted, and the rubber-made sealing members 15b arrange | positioned along the inner periphery of this insertion part 15a. Yes. By inserting the end of the refractory joint pipe 61 into the inserted part 15a, the inner wall of the first connecting part 15 and the outer peripheral surface of the refractory joint pipe 61 are sealed by the seal member 15b.

The end of the first resin joint pipe 13 opposite to the first connecting part 15 is inserted into the second resin joint pipe 14 and joined with an adhesive.
The 2nd resin coupling pipe 14 has the 2nd connection part 16 with which the resin stand pipe 62 which has a flame retardance is connected. The end portion of the standpipe 62 is inserted into the second connecting portion 16 and joined with an adhesive.

As resin which comprises the pipe main body 12 and the standpipe 62, hard vinyl chloride resin is mentioned, for example.
<Coating material>
A coating material 21 is provided on the outer periphery of the tube body 12. The covering material 21 includes an inorganic fiber layer 22 having a fire resistance and a non-air-permeable layer 23. The inorganic fiber layer 22 has air permeability and includes a first inorganic fiber layer 22a and a second inorganic fiber layer 22b. The non-breathing layer 23 is disposed between the first inorganic fiber layer 22a and the second inorganic fiber layer 22b. Thus, the covering material 21 has a laminated structure in which the first inorganic fiber layer 22a, the non-breathing layer 23, and the second inorganic fiber layer 22b are laminated in order.

Examples of the inorganic fiber constituting the first inorganic fiber layer 22a and the second inorganic fiber layer 22b include glass fiber, silica fiber, alumina fiber, ceramic fiber, metal fiber, mineral fiber, alumina fiber, and carbon fiber. . The 1st inorganic fiber layer 22a and the 2nd inorganic fiber layer 22b are comprised from a woven fabric or a nonwoven fabric. The heat-resistant temperature of the first inorganic fiber layer 22a and the second inorganic fiber layer 22b is preferably 700 ° C. or higher, more preferably 800 ° C. or higher, and further preferably 900 ° C. or higher. It is preferable that the density of the 1st inorganic fiber layer 22a and the 2nd inorganic fiber layer 22b is the range of 30-250 kg / m < ³ >. The thickness of the first inorganic fiber layer 22a and the second inorganic fiber layer 22b is preferably in the range of 2 to 15 mm.

  The non-air-permeable layer 23 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 the polymer materials, it is preferable to use at least one selected from an elastomer and rubber because flexibility is easily imparted to the shape along the outer periphery of the tube body 12.

  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 23 may contain additives such as a plasticizer, an antioxidant, and an adhesive as necessary. The thickness of the non-breathing layer 23 is preferably in the range of 0.5 to 5 mm.
Next, details of the arrangement of the covering material 21 will be described.

  In the pipe body 12 described above, the thick wall portion 12a between the first connecting portion 15 and the second connecting portion 16 overlaps the peripheral wall of the first resin joint pipe 13 and the peripheral wall of the second resin joint pipe 14. Is formed. The laminated structure of the covering material 21 is provided at a position extending from the thick portion 12 a to the end of the second connecting portion 16. The laminated structure of the covering material 21 is preferably provided at a position that overlaps at least the thick portion 12a, and more preferably provided at least over the entire length of the second resin joint pipe 14.

  In addition, the 2nd inorganic fiber layer 22b of this embodiment is provided in the position which overlaps with the 1st connection part 15. As shown in FIG. Similarly to the second inorganic fiber layer 22b, the non-breathing layer 23 is also provided at a position overlapping the first connecting portion 15.

<Supporting tool>
The fireproof structure includes a metal support 51 that supports the covering material 21 on the floor slab 71. The support tool 51 includes a holding part 52 that holds the covering material 21 and a support part 53 that supports the holding part 52 on the floor slab 71. Examples of the metal include iron, aluminum, and stainless steel.

  The holding portion 52 includes a cylindrical main body portion 52a, a first wall portion 52b extending along one end surface of the covering material 21, and a second wall portion extending along the other end surface of the covering material 21. 52c. The 1st wall part 52b and the 2nd wall part 52c have a shape which covers the upper end surface and lower end surface of the inorganic fiber layer 22, respectively. Thus, the holding part 52 has a shape that covers the covering material 21.

  The holding part 52 can be mounted from the radial direction of the covering material 21. Such a holding part 52 has, for example, an opening / closing part extending in the axial direction, and a rotating part is provided at a position facing the opening / closing part. The opening / closing part is configured to be engageable and disengageable, and the holding part 52 is mounted by engagement of the opening / closing part.

  In the support tool 51, after fixing one end of the support part 53 to the floor slab 71, at least a part of the support part 53, or the holding part 52 and the support part 53 are connected by a connecting tool such as a bolt and a nut, for example. It is installed by.

<Action>
Next, the operation of the fireproof structure will be described.
Since the fireproof structure includes the support 51 that supports the covering material 21 on the floor slab 71, the positional displacement of the covering material 21 with respect to the pipe body 12, that is, the positional displacement of the covering material 21 with respect to the fireproof joint pipe 61 is suppressed over a long period of time. It is possible. Moreover, since the refractory tube 11 has the inorganic fiber layer 22, heat conduction to the outer periphery of the tube body 12 is suppressed. That is, by providing the covering material 21 on the outer periphery of the pipe body 12, it becomes difficult for the pipe body 12 to soften or thermally decompose in the event of a fire, and the flame-retardant resin constituting the pipe body 12 is the covering material 21. It tends to remain inside.

  As shown in FIG. 2, when the fireproof structure is heated, the tube body 12 is thermally deformed and part of the tube body 12 is thermally decomposed, and a residue 17 is formed inside the covering material 21. The residue 17 closes the entire radial direction inside the coating material 21 or a part of the radial direction.

The effects exhibited by this embodiment will be described below.
(1) The fireproof structure has a configuration in which the fireproof tubular body 11 is connected to the fireproof joint pipe 61. The refractory tube 11 has a tube body 12 and a covering material 21. The covering material 21 includes an inorganic fiber layer 22 having fire resistance. Furthermore, the fireproof structure includes a support 51 that supports the covering material 21 on the floor slab 71.

  According to this configuration, since the covering material 21 is provided on the outer periphery of the tube body 12, it becomes difficult for softening and thermal decomposition of the tube body 12 to proceed in the event of a fire, and the flame-retardant resin constituting the tube body 12. Tends to remain inside the covering material 21. The resin (residue 17) remaining in this way closes the entire radial direction inside the coating material 21 or a part of the radial direction. At this time, since the displacement of the covering material 21 with respect to the refractory joint pipe 61 is suppressed by the support 51, the residue 17 is easily formed in the vicinity of the opening of the refractory joint pipe 61. Thereby, it becomes easy to improve the fire resistance of the division | segmentation penetration part by which the refractory joint pipe 61 made from cast iron is penetrated.

  (2) The support 51 has a shape that covers the entire outer peripheral surface of the covering material 21 and the entire end surface of the inorganic fiber layer 22. According to this configuration, hot air is prevented from directly hitting the outer peripheral surface of the covering material 21, and intrusion of hot air from the end face of the breathable inorganic fiber layer 22 is suppressed. As a result, the softening and thermal decomposition of the tube main body 12 are unlikely to proceed during a fire, and the flame retardant resin constituting the tube main body 12 is likely to remain inside the coating material 21.

  (3) The non-breathing layer 23 is disposed between the first inorganic fiber layer 22a and the second inorganic fiber layer 22b. According to this configuration, the heat insulating action inside the inorganic fiber layer 22 is increased, so that the softening and thermal decomposition of the tube body 12 are difficult to proceed in the event of a fire, and the flame-retardant resin constituting the tube body 12 is reduced. It tends to remain inside the covering material 21.

  (4) The non-breathing layer 23 is formed of a material containing a base material made of a polymer material and an inorganic filler, thereby increasing the viscosity of the polymer material when softened or melted. Thereby, since the non-air-permeable layer 23 becomes easy to stay between the 1st inorganic fiber layer 22a and the 2nd inorganic fiber layer 22b, the shape of the coating | covering material 21 becomes easy to be maintained.

  (5) When a vinyl chloride resin, which is a kind of resin having flame retardancy, is heated, chlorine atoms and hydrogen atoms in the molecule are desorbed as hydrogen chloride gas. This hydrogen chloride gas causes volume expansion of the vinyl chloride resin. For this reason, the pipe body 12 is made of vinyl chloride resin, so that the volume of the residue 17 is likely to increase. Therefore, it is possible to promote the blockage inside the covering material 21.

  (6) The pipe body 12 includes a first resin joint pipe 13 and a second resin joint pipe 14 connected to the first resin joint pipe 13. In this case, it becomes easy to form the thick portion 12a. For this reason, the volume of the residue inside the coating | covering material 21 can be increased easily. Therefore, it is possible to promote the blockage inside the covering material 21.

(Example of change)
In addition, the said embodiment can also be changed and comprised as follows.
-Although the said support tool 51 has the 1st wall part 52b and the 2nd wall part 52c, at least one of the 1st wall part 52b and the 2nd wall part 52c may be abbreviate | omitted.

  -Although the said main-body part 52a has a shape which covers the whole outer peripheral surface of the coating | covering material 21, it may be changed into the shape which covers the outer peripheral surface of the coating | covering material 21 partially. For example, the main body 52a may be formed in a discontinuous annular shape.

The holding portion 52 may have a protrusion that is inserted into the covering material 21. In this case, the positional deviation between the holding portion 52 and the covering material 21 is easily suppressed over a long period of time.
-You may provide the damping layer which suppresses a vibration in at least one part of the outer peripheral surface of the said holding | maintenance part 52, for example.

-Although the said support tool 51 is making the flooring slab 71 support the coating | covering material 21, it may be changed so that the coating | covering material 21 may be supported by the fireproof joint pipe 61. FIG.
-The said air-impermeable layer 23 may be abbreviate | omitted. Further, the non-breathing layer 23 is omitted and one of the first inorganic fiber layer 22a and the second inorganic fiber layer 22b is omitted, so that the covering material is provided with a single inorganic fiber layer. Also good.

  -Either one of the first inorganic fiber layer 22a and the second inorganic fiber layer 22b may be omitted. That is, the said covering material 21 may be changed into the covering material provided with the inorganic fiber layer and the non-breathing layer arrange | positioned on the outer periphery, for example. The heat-insulating action between the inorganic fiber layer and the support 51 can be enhanced by the non-breathing layer arranged in this way. Accordingly, the softening and thermal decomposition of the tube main body 12 are difficult to proceed during a fire, and the flame-retardant resin constituting the tube main body 12 is likely to remain inside the coating material 21.

-The non-breathing layer 23 may contain inorganic fibers.
-At least 1 layer of the said 1st inorganic fiber layer 22a, the 2nd inorganic fiber layer 22b, and the air-impermeable layer 23 may be comprised from the several layer.

-You may further provide the non-breathing layer 23 in the outer periphery of the said 2nd inorganic fiber layer 22b.
-Although the said 2nd inorganic fiber layer 22b has coat | covered the outer periphery of the 1st connection part 15, you may be changed into the structure by which only the thick part 12a is coat | covered. Similarly to the second inorganic fiber layer 22b, the non-air-permeable layer 23 covers the outer periphery of the first connecting portion 15, but may be changed to a configuration in which only the thick portion 12a is covered.

-The covering material 21 may be changed so that the 1st connection part 15 may be coat | covered also by the said 1st inorganic fiber layer 22a.
The pipe body 12 includes a first resin joint pipe 13 and a second resin joint pipe 14, but an integrated resin made of a first connection part 15 and a second connection part 16. It may be changed to a joint pipe. Note that the degree of blockage by the residue 17 can be increased, for example, by setting the thickness of the first inorganic fiber layer 22a or the second inorganic fiber layer 22b to be thicker. Moreover, since the residue 17 tends to increase as the thickness of the tube body 12 increases, the degree of blockage by the residue 17 can be increased by setting the thickness of the tube body 12. The tube main body 12 of the above-described embodiment is advantageous from the viewpoint that the thick wall portion 12a effective for blocking by the residue 17 can be easily formed.

  -The said pipe | tube main body 12 may contain materials other than resin which has a flame retardance. For example, the tube main body 12 can promote the expansion | swelling by heating by changing to the structure containing resin and a thermally expansible material.

-The said pipe | tube main body 12 may be formed with the olefin resin which has a flame retardance, for example.
-Although the said 1st connection part 15 has the to-be-inserted part 15a in which the refractory tube 11 is inserted, it may be changed into the insertion part inserted in the refractory tube 11. In this case, for example, as disclosed in Patent Document 1, a flange is formed on the refractory joint pipe 61, and the refractory pipe body 11 is attached to the refractory joint pipe 61 using the flange, packing, fasteners, and the like. Can be fixed.

  -Regarding the connection structure between the first resin joint pipe 13 and the second resin joint pipe 14 and the connection structure between the second connection portion 16 and the standing pipe 62, the relationship between insertion and insertion is the same as that of the embodiment. It is not limited and can be changed appropriately.

The floor slab 71 is not limited to concrete but may be formed of a stone plate or the like.
-Although the said fireproof structure is applied to the floor slab 71 partitioned along a horizontal direction as a partition part, for example, it is applied to the wall material which has fire resistance partitioned along a vertical direction as a partition part. Also good. In this case, instead of the standpipe 62, a resin horizontal pipe having flame retardancy is connected to the second connecting portion 16.

-The pipe connected to the 2nd connection part 16 is not restricted to the resin pipe which has a flame retardance, and may be changed into the pipe made of cast iron, and the pipe made of steel.
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) In the fireproof structure, the pipe body includes a first resin joint pipe connected to the fireproof joint pipe and a second resin joint pipe connected to the first resin joint pipe. Fireproof structure.

(B) In the fire resistant structure, the covering material further includes a non-venting layer disposed on the outer peripheral side of the inorganic fiber layer.
(C) In the fireproof structure, the covering material further includes a non-breathing layer, the inorganic fiber layer includes a first inorganic fiber layer and a second inorganic fiber layer, and the non-breathing layer includes the first breathable layer. A fireproof structure disposed between an inorganic fiber layer and the second inorganic fiber layer.

Next, the embodiment will be specifically described with reference to examples and comparative examples.
Example 1
The refractory tube shown in FIG. 1 was produced. The tube body was made of vinyl chloride resin, and silica fiber nonwoven fabric was used as the first inorganic fiber layer and the second inorganic fiber layer. The nonwoven fabric has a thickness of about 5 mm, a density of about 125 kg / m ³ , and a heat resistant temperature of about 1000 ° C. As the non-breathing layer, a sheet containing a base material made of an olefin resin and barium sulfate as an inorganic filler was used. The thickness of this sheet is about 1.5 mm. A fireproof structure for testing was formed using this fireproof tube.

  As shown in FIG. 3, a test floor slab 92 made of concrete was provided in the opening of a container 91 having fire resistance and heat insulation. A refractory joint pipe 61 was placed in the through hole 93 of the test floor slab 92, and a mortar 94 was placed above the through hole 93. Then, the fire-resistant pipe body 11 to which the standing pipe 62 having a predetermined length was connected was connected to the fire-resistant joint pipe 61 and the support tool 51 was further attached.

(Comparative Example 1)
In Comparative Example 1, a test fireproof structure was formed in the same manner as in Example 1 except that the covering material and the support were omitted.

(Fire resistance test)
The fire resistance test of the fire resistant structure of Example 1 was performed. In this test, the inside of the container 91 was heated using the burner 95. Then, the heating power of the burner was adjusted so that the start temperature was about 20 ° C. and the end temperature was about 1000 ° C. at the temperature measurement point 96, and the fire resistance test was finished 60 minutes after the start.

Also for Comparative Example 1, a fire resistance test was conducted in the same manner as in Example 1.
Subsequently, after each test, a picture of the flow path was taken from above the fireproof joint pipe 61. Using the photograph, the area of the portion blocked with respect to the opening area at the lower end of the fireproof joint pipe 61 was calculated as a percentage, and this was taken as the blockage rate. The blocking rate of Example 1 was 90% or more, while the blocking rate of Comparative Example 1 was 0%.

  DESCRIPTION OF SYMBOLS 11 ... Fire resistant pipe body, 12 ... Pipe main body, 21 ... Covering material, 22 ... Inorganic fiber layer, 51 ... Supporting tool, 61 ... Fire resistant joint pipe, 71 ... Floor slab (partition part).

Claims (3)

A fire-resistant structure in which a fire-resistant pipe is connected to a fire-resistant joint pipe made of cast iron, which is disposed through a partition of a building up and down ,
The refractory tube has a flame retardant resin tube main body, and a covering material provided on the outer periphery of the tube main body,
The pipe main body has a first connecting part to which the fireproof joint pipe is inserted and connected, and a second connecting part to which a flame-resistant resin standing pipe is inserted and connected,
The covering material includes an inorganic fiber layer having fire resistance,
A support for supporting the covering material on the partition part or the refractory joint pipe ;
The support has a wall portion disposed along a lower end surface of the covering material,
The fireproof structure , wherein the wall portion protrudes at a position overlapping the lower end surface of the pipe body .   The fireproof structure according to claim 1, wherein the support has a shape covering the entire outer peripheral surface of the covering material.   The fireproof structure according to claim 2, wherein the inorganic fiber layer has air permeability, and the support has a shape covering the entire end surface of the inorganic fiber layer.