JP6758137B2 - Fireproof bulkhead - Google Patents

Description

The present invention relates to a refractory bulkhead, and more particularly to a refractory bulkhead used in equipment such as a nuclear power plant.

For electric power cables and mechanical equipment of nuclear power plants, the new regulatory standards for nuclear power plants established by the Nuclear Regulatory Commission, "Examination Standards for Fire Protection of Reactors for Practical Power Plants and Their Ancillary Equipment (Original Regulation No. 1306195) ) ”, It is stated that fire protection measures are required so that various facilities have fire resistance performance of 3 hours or more. In particular, for important equipment, arrange two or more devices of the same type and separate them with a refractory partition wall that has a fire resistance performance of 3 hours or more so that one of the devices will function sufficiently in the event of a fire. It is said that it must be done. For this reason, the fire-resistant bulkhead not only has a fire-resistant performance of 3 hours, but is sufficient to prevent the equipment installed on the other side from causing a failure due to heating in the event of a fire. It is necessary to have excellent heat shielding performance, and it is also necessary to have rigidity that can withstand a heavy water discharge load due to fire extinguishing activities.

Conventionally, in general buildings, fireproof partition walls of a dry construction method have been widely adopted in order to partition the interior space of an existing building as a fireproof section. Among them, partition walls made of gypsum board or calcium silicate board, which do not require heavy panels, are often used because of their ease of construction. For example, in Patent Document 1, at least one top-pasting plate is provided in a fire-resistant partition wall in which a plurality of studs are erected between the upper and lower runners and a bottom-pasting plate and a top-pasting plate made of a fire-resistant material are attached to both sides of the studs. A refractory partition wall (claim 1) characterized by using a calcium silicate board or a gypsum-based board as a base material; the bottom board is a gypsum board, and at least one top board is calcium silicate. Fire-resistant partition wall with a decorative board as a base material (claim 2); A fire-resistant partition with a bottom-paste board as a calcium silicate board and at least one top-paste board as a gypsum-based board-based decorative board. The wall (claim 3) is disclosed.

Further, Patent Document 2 describes a fireproof structure of a partition wall that partitions a space formed by a ceiling surface or a beam lower surface and a floor surface, and an upper runner and an upper runner attached to the ceiling surface or the beam lower surface and the floor surface, respectively. It was composed of a lower runner, a plurality of studs erected between the upper runner and the lower runner, and an underlay refractory plate and an upper refractory plate made of a calcium silicate plate, and were attached to both side surfaces of each stud. A fireproof wall structure (claim 1) is disclosed which includes left and right refractory materials and in which a heat-expandable refractory material that expands by heating is inserted between the upper runner and the ceiling surface or the lower surface of the beam. Further, in paragraph [0032] of Patent Document 2, a calcium silicate plate having a bulk density of 0.25 g / cm ³ is used as an underlay fireproof plate, and a calcium silicate plate having a bulk density of 0.35 g / cm ³ is used as an upholstery fireproof plate. It is described that each is used.

Japanese Unexamined Patent Publication No. 11-19008 Japanese Unexamined Patent Publication No. 2012-522333

However, with the fire-resistant partition wall disclosed in Patent Document 1, it is difficult to secure the fire-resistant performance for 3 hours, and in the event of a fire, the paper portion on the surface of the gypsum board disappears and loses its strength. It could not withstand the water discharge by. Further, in the refractory wall structure disclosed in Patent Document 2, a calcium silicate plate having a bulk density of 0.25 g / cm ³ as an underlay refractory plate and a silicate plate having a bulk density of 0.35 g / cm ³ as an upper refractory plate are used. Although it is exemplified that calcium plates are used respectively, in a configuration using only calcium silicate plates corresponding to JIS A 5430 type 3, the total thickness of the refractory wall structure is to be made as thin as possible. In some cases, even if the refractory performance can be ensured, the strength of each refractory plate is insufficient, so that it cannot be said that the refractory plate has sufficient rigidity to withstand severe water discharge in the event of a fire. However, Patent Document 2 does not provide any suggestion or disclosure regarding the response to such a problem. That is, the conventional refractory partition structure does not have a refractory performance of 3 hours or more, sufficient heat shielding performance, and rigidity.

Therefore, an object of the present invention is to ensure fire resistance for 3 hours and heat insulation performance sufficient to maintain the performance of important equipment while having a practical wall thickness, and further, in the event of a fire. The purpose is to provide a fire-resistant bulkhead that can sufficiently withstand severe water discharge due to fire extinguishing activities.

That is, the refractory partition wall of the present invention is a steel frame body fixed between the superstructure skeleton and the substructure skeleton constituting the interior space of the building, and is fixed and erected in the direction perpendicular to the steel frame body. It is characterized in that it is provided with a base material, an underlaying material installed on both sides of the base material, and an upholstery material installed on the outer surface of the underlaying material.

Further, the refractory partition wall of the present invention is characterized in that the base material is a square steel pipe for general structure.

Further, in the refractory partition of the present invention, when the underlaying material is composed of a high-strength calcium silicate refractory material or a lightweight calcium silicate refractory material, and the underlaying material is a high-strength calcium silicate refractory material, the upper part is used. The upholstery is composed of a lightweight calcium silicate refractory material, and when the underlaying material is a lightweight calcium silicate refractory material, the upholstery material is composed of a high-strength calcium silicate refractory material. To do.

Further, the refractory partition wall of the present invention, high-strength silicon bulk density of calcium refractories material 0.80 g / cm ³ or more 1.20 g / cm less than ^3, the bending strength of 7~28N / mm ^2, a thickness The residual shrinkage rate after heating at 20 to 35 mm and 1200 ° C is within the range of 4% or less, the bulk density of the lightweight calcium silicate refractory material is 0.35 g / cm ³ or more and less than 0.70 g / cm ³ , and the bending strength. Is 1.5 to 6 N / mm ² , the thickness is 15 to 30 mm, and the thermal conductivity is within the range of 0.14 W / m · K or less.

Further, in the refractory partition wall of the present invention, the length of the side of the base material in the thickness direction in the thickness direction is 40 to 60 mm, the one-side laminated thickness of the underlaying material and the upholstery material is 35 to 50 mm, and the base material is used. When the thickness of the refractory bulkhead body composed of the material and the underlaying material and the upholstery material installed on both sides of the base material is 110 to 150 mm, and heating is performed from one side for 3 hours according to the ISO834 heating curve. The temperature rise on the non-heated side of the above from before heating is 180 ° C. or less.

Further, the refractory partition wall of the present invention is characterized by being provided with a finishing material installed on the outer surface of the upholstery material.

Further, the fireproof partition wall of the present invention is characterized in that the finishing material is selected from the group consisting of a flexible plate, a fiber-mixed gypsum plate, a gypsum board, a metal steel plate, a tarpaulin and a wallpaper.

According to the present invention, it is possible to guarantee the performance of the 3-hour fire-resistant partition in the fire protection regulations in the examination concerning the conformity with the new regulatory standards of the nuclear power plant of the Nuclear Regulatory Commission and the internal fire countermeasures / design examination guide. It is possible to provide a fireproof partition having a fire resistance of 3 hours, sufficient heat shielding performance for maintaining the function of important equipment, and rigidity to withstand the discharge of water for fire extinguishing activities.

It is the schematic which shows one Embodiment of the refractory bulkhead of this invention. It is a horizontal sectional view of the refractory bulkhead shown in FIG. It is the schematic of the specimen of the refractory partition wall used for the 3-hour fire resistance test and the water discharge test in an Example. It is a horizontal sectional view of the specimen shown in FIG. It is a vertical sectional view of the specimen shown in FIG. It is a graph which shows the ISO834 heating curve.

Hereinafter, the refractory partition wall of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a schematic view showing one embodiment of the refractory partition wall of the present invention, and FIG. 2 is a horizontal sectional view of the refractory partition wall shown in FIG. The steel frame 5 is assembled between the superstructure skeleton (not shown) and the substructure skeleton (not shown) constituting the interior space of the building, and at least a part thereof is fixed to the structural skeleton of the building. ing. Here, the steel frame body 5 can be fixed to any of the floors, walls, columns, ceilings or beams constituting the interior space of the building. The method of fixing the steel frame body 5 is not particularly limited, but it can be fixed with anchor bolts or the like using a fixing bracket such as an L-shaped material. As the steel frame 5, for example, channel steel, H-section steel (both hot-rolled shaped steel: equivalent to JIS G 3192), square steel pipe for general structure (corresponding to JIS G 3466), and the like can be used. In the case of a structure in which the steel frame body 5 is largely exposed, the steel frame body 5 can also be provided with a fireproof coating as needed.

The base material 1 is fixed and erected in the direction perpendicular to the steel frame body 5. Here, the fixing of the base material 1 to the steel frame body 5 is not particularly limited, but is performed by welding using a fixing metal fitting such as an L-shaped material, fixing with bolts, or the like. be able to. It should be noted that the base material 1 installed at both ends of the refractory partition wall may be fixed along the vertical portion of the steel frame body 5. As the base material 1, for example, a square steel pipe for general structure (equivalent to JIS G 3466), an H-shaped steel (hot rolled steel: equivalent to JIS G 3192), or the like can be used.

Underlaying materials 2 are installed on both sides of the base material 1. As the underlaying material 2, a high-strength calcium silicate refractory material or a lightweight calcium silicate refractory material can be used.

Here, the high-strength calcium silicate refractory material, bulk density 0.80 g / cm ³ or more 1.20 g / cm less than ^3, the bending strength of 7~28N / mm ^2, a thickness of 20 to 35 mm, 1200 The residual shrinkage rate after heating at ° C. is within the range of 4% or less. If the bulk density of the high-strength calcium silicate refractory material is less than 0.80 g / cm ^3, it is difficult to secure the strength to withstand the water discharge associated with the fire extinguishing activity in the event of a fire, which is not preferable, and 1.20 g. If it is / cm ³ or more, the mass of the refractory material becomes heavy and the workability deteriorates, which is not preferable. Further, if the bending strength of the high-strength calcium silicate fireproof material is less than 7 N / mm ^2, it is not preferable because it is insufficient to withstand the water discharge associated with the fire extinguishing activity at the time of fire, and the bulk density is not high. Within the range, a calcium silicate fire-resistant material having a bending strength of more than 28 N / mm ² is practically unavailable. Further, if the thickness of the high-strength calcium silicate refractory material is less than 20 mm, it is difficult to secure the strength to withstand the water discharge associated with the fire extinguishing activity at the time of fire, and if it exceeds 30 mm, the entire fire-resistant partition wall is not preferable. It is not preferable because the thickness of the is too thick. Further, if the residual shrinkage rate of the high-strength calcium silicate refractory material after heating at 1200 ° C. exceeds 4%, a gap is likely to occur in the joint portion when a fire is received, which is not preferable.

The lightweight calcium silicate fireproof material has a bulk density of 0.35 g / cm ³ or more and less than 0.70 g / cm ³ , a bending strength of 1.5 to 6 N / mm ² , a thickness of 15 to 30 mm, and heat. The conductivity is in the range of 0.14 W / m · K or less. If the bulk density of the lightweight calcium silicate refractory material is less than 0.35 g / cm ^3, it is not preferable because the material has insufficient strength, and if it is 0.70 g / cm ³ or more, the thermal conductivity is high. Is not preferable because it becomes expensive. If the bending strength of the lightweight calcium silicate fireproof material is less than 1.5 N / mm ^2, it is not preferable because the handling during construction deteriorates, and the bending strength is 6 N / mm within the above-mentioned bulk density range. Calcium silicate fireproof materials over mm ² are virtually unavailable. Further, if the thickness of the lightweight calcium silicate refractory material is less than 15 mm, it is difficult to secure heat insulating properties for obtaining sufficient fire resistance, and if it exceeds 30 mm, it is not preferable. It is not preferable because the overall thickness becomes too thick. Further, if the thermal conductivity of the lightweight calcium silicate refractory material exceeds 0.14 W / m · K, sufficient fire resistance cannot be ensured, which is not preferable.

The method of attaching the underlaying material 2 to the base material 1 is not particularly limited, and for example, it can be fixed by using a fastener 4 such as a tapping screw or a bolt. Further, the connection between the adjacent underlaying members 2 can have a structure in which the end faces are brought together.

Next, the upholstery member 3 is installed on the outer surface of the underlayment member 2. Here, when the underlaying material 2 is composed of the high-strength calcium silicate refractory material, the upholstery material 3 is composed of the lightweight calcium silicate refractory material, and the underlaying material 2 is the lightweight. When composed of a calcium silicate refractory material, the upholstery material 3 is composed of the high-strength calcium silicate refractory material. When the resistance to water discharge of fire extinguishing activity in the event of a fire is emphasized, it is preferable that the upholstery material 3 is a high-strength calcium silicate refractory material.

The method of attaching the overlay material 3 to the base material 2 is not particularly limited, and for example, it can be fixed by using a fastener 4 such as a tapping screw or a bolt. Further, the connection between the adjacent upholstery members 3 can have a structure in which the end faces are brought together.

In the refractory partition wall of the present invention having the above-described configuration, the length of the side of the base material in the thickness direction of the refractory partition wall is 40 to 60 mm, and the one-side laminated thickness of the underlaying material and the overlay material is 35 to 50 mm. The thickness of the refractory bulkhead body composed of the base material and the underlaying material and the upholstery material installed on both sides of the base material is 110 to 150 mm, and 3 hours from one side according to the ISO834 heating curve. The temperature rise on the non-heated side when heating is performed from before heating is set to 180 ° C. or less.

Next, in the refractory partition wall of the present invention, a finishing material can be installed on the outer surface of the upholstery material 3. As the finishing material, for example, a flexible plate, a fiber-mixed gypsum plate, a gypsum board, a metal steel plate, a tarpaulin, a wallpaper and the like can be used, and a flexible plate, a fiber-mixed gypsum plate and a metal steel plate are particularly preferable. The flexible plate and the fiber-mixed steel plate can be used with a thickness of 3 to 6 mm, and the metal steel plate can be used with a thickness of 0.1 to 1 mm. Here, the method of attaching the finishing material to the base material 2 is not particularly limited, and for example, it can be fixed by using tapping screws, staples, an adhesive or the like. When a finishing material is used, the finishing material may be installed on one side or both sides. Further, instead of the finishing material, a paint, a waterproofing agent or the like can be applied to the surface of the upholstery material.

Next, the refractory partition wall of the present invention will be further described with reference to Examples.
Specimens of the refractory bulkhead of the present invention were prepared in the shapes shown in FIGS. 3, 4 and 5, and the "Examination Criteria for Fire Protection of Practical Power Reactors and Their Ancillary Facilities (Original)" established by the Nuclear Regulation Authority. It was subjected to a 3-hour fire resistance test and a water discharge test after the 3-hour fire resistance test in accordance with "Regulation No. 1306195)".

FIG. 3 is a schematic view of the specimen of the refractory bulkhead, FIG. 4 is a horizontal sectional view of the specimen shown in FIG. 3, and FIG. 5 is a vertical sectional view of the specimen shown in FIG. .. As shown in FIGS. 3, 4 and 5, a steel frame body 5 having a size of 1300 mm × 1250 mm × 144 mm is formed of channel steel having a size of 150 × 75 mm (thickness: 6.5 mm), and the base material 1 is 100 × 50 mm (thickness: 6.5 mm). A square steel pipe for general structure (thickness: 2.3 mm) was fixed to the steel frame 5 by welding, and on both sides of the base material 1, the thickness was 27 mm, the bulk density was 0.98 g / cm ³ , and the bending strength was 8. A high-strength calcium silicate fireproof material having a residual shrinkage rate of 2.6% after heating at 9 N / mm ² and 1200 ° C. was fixed to the base material 1 using tapping screws as the underlay material 2, and then the outer surface of the underlay material 2 was used. A lightweight calcium silicate fireproof material with a thickness of 20 mm, a bulk density of 0.43 g / cm ³ , a flexural strength of 4.5 N / mm ² , and a thermal conductivity of 0.088 W / m · K is used as the overlay material 3. Fixing to the base material 1 with a tapping screw, the specimen No. I got 1.
The method for measuring each physical property value is based on JIS A 5430. However, the flexural strength was measured with the width of the test piece set to 50 mm and the bending span set to 200 mm. The residual shrinkage rate after heating at 1200 ° C. was determined by heat-treating a test piece whose dimensions were measured in advance under the condition of 1200 ° C. for 3 hours, cooling to room temperature, and then measuring the dimensions again.

Further, as the underlaying material 2, a lightweight calcium silicate refractory material having a thickness of 20 mm, a bulk density of 0.43 g / cm ³ , a bending strength of 4.5 N / mm ² , and a thermal conductivity of 0.088 W / m · K was used. As the overlay material 3, a high-strength calcium silicate refractory material with a thickness of 27 mm, a bulk density of 0.98 g / cm ³ , a flexural strength of 8.9 N / mm ² , and a residual shrinkage rate of 2.6% after heating at 1200 ° C. is used. Except for the presence, the specimen No. Specimen No. 1 has the same configuration as No. 1. 2 was prepared.

(1) 3-hour fire resistance test Specimen No. in a test furnace that can heat only one side of the specimen. No. 1 was installed, and heating was performed for 3 hours according to the ISO834 heating curve shown in FIG. 6 using a gas burner, and thermocouples were placed at 12 locations including the joints on the back surface (the surface on the non-heated side) of the specimen. The temperature during heating was measured by the pair, and it was observed whether any abnormality appeared in the state of the back surface. Immediately after the completion of heating, the specimen No. 1 was taken out from the test furnace and a water discharge test was carried out. In addition, the specimen No. The same test was conducted for 2.
From the test results, the pass / fail of the 3-hour fire resistance test was judged according to the following criteria.
Criteria for passing the 3-hour fire resistance test:
(A) The average value of the temperature rise on the back surface from before the start of heating is 140 ° C. or less;
(B) The maximum value of the temperature rise on the back surface before the start of heating is 180 ° C. or less;
(C) The flame does not penetrate to the back surface side of the specimen during heating.

The results of the 3-hour fire resistance test are shown in Table 1. As a result of the test, since all of the above-mentioned acceptance criteria were satisfied, the specimen No. Both 1 and 2 were pass judgments. Further, it can be said that the measured value of the back surface temperature has high fire resistance performance and heat shielding performance because there is a sufficient margin for the above-mentioned acceptance criteria.

(2) Water discharge test after 3-hour fire resistance test Immediately after the 3-hour fire resistance test was performed, the specimen was removed from the test furnace, and a water discharge test from the heated surface was performed under the conditions shown in Table 2. The condition of the specimen was observed during and after water discharge, and the pass / fail of the water discharge test was judged according to the following criteria.
Criteria for passing the water discharge test: There is no opening that penetrates to the back side in the water discharge test by direct sunlight.

As a result of the water discharge test, the specimen No. In each of 1 and 2, in the water discharge test by direct irradiation to the heated surface performed immediately after the 3-hour fire resistance test, an opening penetrating to the back surface side was not formed, and the pass judgment was made in light of the above-mentioned pass judgment criteria. In addition, the specimen No. In No. 1, a part of the upholstery material on the heating surface side fell off during the discharge water, but the specimen No. In No. 2, no dropout of the refractory material in the discharged water was observed.

As described above, the specimen No. In Nos. 1 and 2, no flame was ejected or smoked on the back surface side during heating for 3 hours, and no damage such as cracks through which the flame passed occurred. Further, even in the water discharge test after heating for 3 hours, there was no opening penetrating to the back surface side, which sufficiently satisfied the judgment criteria. In addition, the specimen No. In 1 and 2, the temperature of the back surface of the test piece was equal to or lower than the combustible combustion temperature specified by the Building Standards Act.

1: Base material, 2: Underlay material, 3: Upholstery material, 4: Fastener, 5: Steel frame

Claims (6)

A steel frame fixed between the upper structure skeleton and the lower structure skeleton that constitute the interior space of the building, a base material fixed and erected in the direction perpendicular to the steel frame body, and both sides of the base material. a ing refractory partition wall provided with upholstery material installed in the installed outer surface of the underlayer material and the lower clad material, the length in the thickness direction of the side of the fire partition walls of the base material in 40~60mm Yes, the laminated thickness of the underlaying material and the upholstery material on one side is 35 to 50 mm, and the total thickness of the base material and the refractory partition body composed of the underlaying material and the upholstery material installed on both sides of the base material. A refractory partition having a diameter of 110 to 150 mm and having a temperature rise of 180 ° C. or less on the surface on the non-heated side when heated from one side for 3 hours according to the ISO834 heating curve. .. The refractory partition wall according to claim 1, wherein the base material is a square steel pipe for general structure. If the underlayment is composed of a high-strength calcium silicate refractory or a lightweight calcium silicate refractory and the underlayment is a high-strength calcium silicate refractory, the upholstery is a lightweight calcium silicate refractory. The fireproof partition according to claim 1 or 2, wherein the upholstery is made of a high-strength calcium silicate refractory material when the underlaying material is a lightweight calcium silicate refractory material. High strength calcium silicate electrolyte bulk density of the refractory material is 0.80 g / cm ³ or more 1.20 g / cm less than ^3, the bending strength of 7~28N / mm ^2, a thickness of 20 to 35 mm, remaining after 1200 ° C. heating The shrinkage rate is within the range of 4% or less, the bulk density of the lightweight calcium silicate refractory material is 0.35 g / cm ³ or more and less than 0.70 g / cm ³ , and the bending strength is 1.5 to 6 N / mm ^2. The refractory partition according to claim 3, wherein the thickness is 15 to 30 mm, and the thermal conductivity is within the range of 0.14 W / m · K or less. The refractory bulkhead according to any one of claims 1 to 4 , further comprising a finishing material installed on the outer surface of the upholstery. The refractory partition wall according to claim 5 , wherein the finishing material is selected from the group consisting of a flexible plate, a fiber-mixed steel plate, a steel plate, a metal steel plate, a tarpaulin, and a wallpaper.

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