JP5301415B2 - Fireproof joint structure and outer wall having this fireproof joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure having a fire resistance increased utilizing the vaporization heat of moisture. <P>SOLUTION: This fireproof joint structure includes a connection metal fitting 12 installed between the opposed ends of two wall bodies which constitute the outer wall of a structure, and a water retaining member 22 filled in at least the depth part of the joint space excluding the outer part to protect the connection metal fitting against fire on the outside of the structure. The connection metal fitting includes a mounting plate part 14b projecting from one wall body to the other wall body and a buried plate part 14a which is inserted from the mounting plate part into the depth part of the joint space and fixed to the opposed end surface of the other wall body. The water retaining member 22 is formed of a material which does not almost release water at a specified temperature or below and releases water above the specified temperature, and covers the entire part of the surface of the connection metal fitting exposed to the joint space 6. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a fire joint structure and an outer wall having the fire joint structure.

  Conventionally, as a joint of the outer wall panel of the building, the outer edge of the joint is closed with a waterproof sealing material, and a back-up material is provided on the back side (joint bottom) of this sealing material to prevent adhesion of the three surfaces of the sealing material. In this case, a portion filled with a refractory material such as rock wool is known (Patent Document 1). There is also known a connecting tool in which a channel-shaped frame plate is attached to each facing end surface of the outer wall panel and the frame plate is connected by a metal fitting (Patent Document 2).

  Furthermore, although it is not restricted to the outer wall of a building, covering the connection part of the two wall materials which comprise a structure with a fireproof coating material is performed conventionally (patent document 3).

  In addition, in order to prevent the flame from penetrating the joint, a thermal expansion refractory material (thermal expansion graphite, etc.) is attached to one of the opposite end faces of the wall material, and this thermal expansion refractory material expands in the event of a fire. The one that closes the joint is known (Patent Document 4).

Japanese Patent Application Laid-Open No. 08-049387 JP 07-180241 A JP 2005-188232 A Japanese Patent No. 3790468 JP-A-11-315605

Tomohiro Murakami “Reusable polymer gel water-absorbing sheet for preventing sweat wetting loss” January 21, 2006

  The outer wall of the building is required to suppress the temperature rise on the inner side of the metal fitting that connects the panel materials according to the Building Standards Act within a predetermined time during a fire. Since the connector of Patent Document 2 often used for the inner wall of a building extends from the inside of the joint to the outside, it easily exceeds the specified temperature due to the good thermal conductivity of the metal. Therefore, the applicant tested the fire resistance performance by connecting the outer wall panels using L-shaped connecting fittings that are often used for the outer wall of the building and inserted from the inside of the building to the middle of the joint structure.

  As a result of assuming indoor fire, it was confirmed that the prescribed fire resistance (flame shielding) was satisfied. However, in the test that assumed an outdoor fire, it was found that the temperature of the metal part inside the building increased by 180 K in about 25 minutes from the start of the test, and sufficient heat shielding properties could not be obtained. For this reason, under the present circumstances, covering with a refractory material such as spray wool or the like is required for the metal part.

  In the case of an outdoor fire, the L-shaped connecting bracket of the type in which the end portion is inserted into the joint space is likely to rise in temperature because the end portion is close to the fire source. If the joint space is filled with a material that suppresses heat conduction like the rock wool of Patent Document 1, the temperature rise of the L-shaped bracket can be suppressed to some extent, but the above-mentioned fire resistance standard is not satisfied.

  One way to deal with this problem is to employ a fitting shape that does not enter the joint space. However, depending on the construction method, there is a case where it is desired to use an L-shaped connecting fitting as a connecting means for the wall body. For example, it is a case where a locking structure (see Patent Document 5) in which a wall body rotates in an in-plane direction with an end portion of an L-shaped connecting fitting as a fulcrum, or a case where a slide structure described later is adopted.

  Another method for dealing with this problem is to directly cover the metal part of the connector with a refractory material such as rock wool (see Patent Document 3). Thereby, the temperature rise on the back side of the outer wall against an outdoor fire can be suppressed to some extent. However, it takes cost, time and labor to perform the fireproof coating operation.

  Therefore, there is a demand for economically improving the fire resistance performance of joints with an idea different from that of fireproof coating materials such as rock wool.

  The first object of the present invention is to propose a joint structure with improved fire resistance performance by utilizing the heat of vaporization of moisture.

  The second object of the present invention is to propose a joint structure in which a material containing moisture is provided in the back of the joint space around the metal fitting inserted from the inside of the building, and the temperature rise of the metal fitting is suppressed.

  The third object of the present invention is to propose a joint structure having a shape capable of sufficiently increasing the water retention amount in the joint space.

The first means is
A fireproof joint structure formed between opposing ends of a wall body such as at least two panel members connected in a vertical direction or a horizontal direction to constitute an outer wall of the structure,
Opposite end faces of both walls,
A connection fitting erected between the inner side of the structure among the opposite ends of the wall,
In order to protect the connection fitting from a fire outside the structure, the water retaining member filled at least in the inner part of the joint space except the outer part,
The connecting metal fitting includes a mounting plate portion that protrudes from one wall body to the other wall body, and an embedded plate portion that protrudes from the mounting plate portion into the back of the joint space and is fixed to the opposite end surface of the other wall body. Have
The water retaining member is formed of a material that releases almost no water below a certain temperature and releases above a certain temperature, and is configured to cover a portion of the surface of the connection fitting that is exposed to the joint space. doing.

  The purpose of this means is to contain moisture in the joint space and delay the temperature rise of the connecting metal fitting by evaporating the moisture in the event of a fire. As shown in FIG. 2, a part (embedded plate part) of the connecting metal fitting is inserted from the inside of the building into the back part of the joint space, and does not reach the outer end of the joint space. This is because the temperature rises quickly when the connecting bracket is exposed to the outside of the building. In addition, you may form the sealing material which obstruct | occludes the outer end of joint space between the opposing end surfaces of the said both wall bodies. Moreover, although the water retaining member is filled at least in the back part of the joint space, it may be filled in substantially the entire joint space (portion excluding the sealing material).

  The “back portion of the joint space” is a portion excluding at least the outer portion of the joint space, and is used as a space for inserting the embedded plate portion of the connecting metal fitting. The shorter the insertion length is, the less heat conduction will be. However, to ensure the accuracy of mounting the upper wall and to support the wall load with the embedded plate, it should be at least half the thickness of the joint space. Is desirable. In a preferred example of illustration, about 70% of the inside of the joint space is used as a storage space for the embedded plate portion.

  The “water retaining member” has a function of discharging water at a certain temperature or higher and stopping releasing water at a certain temperature or lower. A cloth impregnated with water is not included in the water retaining member because moisture gradually evaporates even at room temperature and may dry out in the event of a fire. A suitable example of the water-retaining member is a temperature-sensitive water-absorbing polymer, which causes a phase transition at a certain temperature (temperature-sensitive point), and shrinks the polymer as it moves from the swollen phase to the dry phase. To forcibly discharge the contained water. Below the temperature sensitive point, the release of water is stopped and, conversely, water absorption is exhibited. Detailed description will be described later. Other suitable examples are dihydrate gypsum, aluminum hydroxide, manganese hydroxide and the like that cause a dehydration reaction above a certain reaction temperature, and these also hardly produce water below the reaction temperature. Even if it says “stopping the release of water”, it is sufficient if the amount of water released is small compared to a state where the temperature is above a certain level. In the illustrated example, a water retention member is provided between the end face of one wall body and the embedded plate portion fixed to the other wall body. Covering the water retaining member with the entire exposed portion of the surface of the connecting fitting in the joint space is preferable in terms of maintaining the blockage of the joint space and preventing foreign matter from entering.

The second means includes the first means, and a storage recess is formed in an inner portion of one of the opposing end surfaces of the both wall bodies, and the water storage member is filled in the storage recess and the joint space. ing.

  In this means, the storage volume of the water retaining member is increased by forming a storage recess on the opposite end face of the wall as shown in FIG. In the example of illustration, although provided in one (upper end surface) of two opposing end surfaces, you may provide in both end surfaces.

The third means has the second means, and the water retaining member is formed in the inner part of the joint space, and the joint space portion outside the water retaining member is blocked with at least a blocking member that blocks radiant heat. .

  In this means, as shown in FIG. 3, it is proposed that the member located just outside the water retaining member is at least a blocking member that blocks radiant heat. The member in the illustrated example also serves as a backup member for the sealing material. Combined with the configuration in which the water retention member is provided in the back part of the joint space, the temperature rise of the water retention member and the coupling fitting can be delayed.

  The fourth means includes third means, and the closing member 10 is formed of a thermally expandable refractory material.

  In this means, it has been proposed that a heat-expandable refractory material is used as the closing member, and the closing member is expanded by the heat of fire as shown by an arrow in FIG. Thereby, heat insulation performance can further be improved.

The fifth means includes any one of the first means to the fourth means, and the water retention member is formed of a bag-containing temperature-sensitive water-absorbing polymer, and is formed in the joint space on the surface of the connecting fitting. Covering the facing part with a foam coating layer that is foamed by heat, and setting the foaming start temperature of the foam coating layer to be higher than the temperature sensing point of the temperature-sensitive water-absorbing polymer, the water retaining member shrinks due to the evaporation of moisture. The voids generated in this manner are configured to be used as expansion allowance for the foam coating layer.

  This means proposes to use both the heat of vaporization by the water retaining member and the fire resistance of the foam coating (see FIGS. 7 and 8). Compared with the case where a certain fire resistance performance is realized by using only the foam coating material, the amount of the relatively expensive foam coating material can be reduced. The thermosensitive temperature at which the foam coating material foams is set higher than the temperature sensitive point of the temperature-sensitive water-absorbing / draining polymer. According to this structure, as shown in FIG. 8, a foaming material can expand | swell in the space which the water retention member contracted and produced, and space saving is achieved.

  The sixth means is an outer wall in which the joint structure according to any one of the first means to the fifth means is formed between the opposing end surfaces of the wall body, and each wall body has a thermal conductivity such as an ALC plate. It is made of a low material.

  In this means, an outer wall including the joint structure described in the previous means is proposed (see FIG. 1). This is because, by reducing the thermal conductivity of the outer wall panel, the feature of the present invention in which the outer surface of the connecting fitting is covered with a water retaining member is utilized.

The invention according to the first means has the following effects.
○ Since the water in the water retaining member evaporates, heat is taken away, improving fire resistance.
○ Costs are lower than fireproof measures that only cover the joint structure with foam coating.

  According to the invention relating to the second means, since the storage recess is provided in one of the both wall bodies, the volume of the water retaining member can be increased.

  According to the third aspect of the invention, since the water retaining member is provided in the inner part of the joint space and the blocking member that blocks the radiant heat is provided in front of the water retaining member, heat conduction due to radiation can be reduced.

  According to the invention relating to the fourth means, since the closing member is formed of the thermally expandable refractory material, the flame is prevented from breaking through the joint and entering the inside of the outer wall.

  According to the invention relating to the fifth means, since the temperature-sensitive water-absorbing polymer and the foam coating layer are used in combination, the amount of the foam coating agent used can be reduced and a compact configuration can be achieved.

  According to the invention relating to the sixth means, since the thermal conductivity of the wall body is low, the connecting metal fitting does not reach a high temperature through the wall body.

1 is a front view showing an outer wall including a fireproof joint structure according to a first embodiment of the present invention with a half cutout of the fireproof joint structure. It is sectional drawing which looked at the fireproof joint structure of FIG. 1 from the II-II direction. It is an expanded sectional view of the fireproof joint structure of FIG. It is sectional drawing which looked at the fireproof joint structure of FIG. 1 from the IV-IV direction. It is explanatory drawing of design of the fireproof joint structure of this invention. It is sectional drawing which looked at the fireproof joint structure concerning the 2nd Embodiment of this invention from the side. It is the front view which notched half the fireproof joint structure of FIG. It is sectional drawing seen from the side of the fireproof joint structure which concerns on the 3rd Embodiment of this invention. It is action | operation explanatory drawing of the fireproof joint structure of FIG. It is effect | action explanatory drawing of the fireproof joint structure which concerns on the 4th Embodiment of this invention. It is a side view of the Example of the fireproof joint structure of this invention. It is a partially notched front view of the other Example of the fireproof joint structure of this invention.

  1 to 5 show an outer wall including a fireproof joint structure according to a first embodiment of the present invention. In FIG. 1, W is an outer wall, and is composed of first and second wall bodies that are a waist wall S and a panel material P, and a fireproof joint structure 2. The panel material is preferably formed of a lightweight and highly heat-insulating material such as an ALC plate. As shown in FIG. 2, the outer part of the opposing edge part of the two wall materials which comprise a fireproof joint structure has the role which blocks | interrupts that a radiant heat hits diagonally upward and diagonally downward with respect to the below-mentioned water retention member.

  The fireproof joint structure 2 includes end surfaces 4U and 4L of both wall bodies shown in FIG. 2, a sealing material 8, a backup material 10, a connecting fitting 12, a spacer 20 shown in FIG. 1, and a water retaining member 22. ing. A space between the end faces 4U and 4L of both wall bodies is referred to as a joint space 6, and a portion of the joint space excluding the outer portion 6a is referred to as a back portion 6b of the joint space as shown in FIG.

  The sealing material 8 is a material that seals the outer end of the joint space 6 in an airtight or watertight manner in order to prevent rainwater and dirt from entering the joint.

  The backup material 10 is generally a synthetic resin or rubber member that does not adversely affect the sealing material such as discoloration and does not adhere to the sealing material, and supports the sealing material 8 from the inside of the building. The backup material of the present embodiment also serves as a blocking member that blocks radiant heat from the outside. The sealing material and the backup material occupy the outer part of the joint space 6.

  The connecting metal fitting 12 is attached over the whole width direction of these wall bodies along the edge part of both wall bodies. In the illustrated example, as shown in FIG. 3, the connecting metal fitting includes a first metal fitting 14 having an L-shaped cross section and a second metal fitting (inazuma metal fitting) 16 having a lightning shape.

  The first metal fitting 14 is formed by refracting a single plate material into an L-shaped cross section, and any metal member can be inserted between the two wall materials by inserting a part of the metal fitting into the joint space 6. Such a shape may be used. The illustrated first metal fitting 14 projects a horizontal embedded plate portion 14a from the lower end of the vertical mounting plate portion 14b. The mounting plate portion 14b extends along the inner surface of the upper wall body, and the embedded plate portion 14a. Is brought into contact with the end surface 4L of the lower wall body and fixed to this end surface by a fixing tool (not shown).

  As shown in FIG. 3, the embedded plate portion 14a of the first metal fitting 14 is disposed only in the inner portion 6b of the joint space, and a distance is provided between the tip of the embedded plate portion 14a and the outer end of the joint space. I'm taking it. This is because if the front end of the embedded plate portion reaches the outer end of the joint space, the first metal fitting 14 is directly exposed to radiation from the fire at the time of a fire, and the temperature rise is accelerated. In a preferred illustrated example, a distance of about 3 cm is set between the outer end of the joint space 6 and the front end of the embedded plate portion 14a with respect to the outer wall having a thickness of 10 cm.

  The second metal fitting 16 has an upper half fixed to the inner surface of the upper wall with bolts and nuts, etc., and the first metal fitting between the lower half of the second metal fitting and the inner surface of the upper wall. The mounting plate part 14b of the metal fitting 14 is slidably sandwiched. Thus, the upper wall body is configured to be swingable in the in-plane direction with respect to the lower wall body. However, when this swinging is not required, the connecting metal fitting may be formed of only the first metal fitting.

  As shown in FIG. 4, the spacer 20 is a plate material inserted in the center portion of the outer wall between the embedded plate portion 14 a and the end surface 4 U of the upper wall body. With this spacer as the center, the upper wall can swing in the in-plane direction as shown by an arrow in FIG.

  The water retaining member 22 is configured by putting a conventionally known temperature-sensitive water-absorbing polymer 24 in a storage bag 26. The water retaining member 22 is installed so as to cover the entire contour exposed to the joint space in the first metal fitting 14 shown in FIG. Thereby, the temperature of the 1st metal fitting 14 can be suppressed below to the boiling point of water until a water | moisture content evaporates. Further, it is desirable that the water retaining member is provided over almost the entire length of the first metal fitting 14 in the depth direction. In the illustrated example, a pair of water retaining members 22 are provided on both sides of the spacer 20 as shown in FIG. 1, but the structure can be changed as appropriate. Although not shown in the drawings, it is preferable that a slight gap is provided between the water retaining member and the end face 4U of the upper wall so as not to prevent the wall from swinging.

The temperature-sensitive water-absorbing / draining polymer 24 has the following characteristics (Non-Patent Document 1).
(A) A polymer network is a substance that is three-dimensionally cross-linked and contains water therein, and has a property that its volume changes from tens to hundreds of times from a shrink phase to a swollen phase due to temperature change.
(B) The above volume change occurs abruptly, and water is quickly discharged by the shrinkage force of the polymer.
(C) Below the phase transition temperature (referred to as the temperature sensitive point), it has water absorption performance.
(D) The temperature sensitive point can be easily changed by the ionization ratio.
(E) The phase change described above is reversible, and the suction and drainage can be repeated any number of times.

  According to the property (a), it is possible to contain a very large amount of water as compared with the volume of the polymer itself, which is convenient for storing a required amount of water in a limited joint space. Further, according to the property (b), water can be discharged before the connection fitting reaches a predetermined temperature even if the fire is relatively fast. On the other hand, according to the nature of (c), the water holding power is strong below the temperature sensitive point. According to the property (d), there is an advantage that the temperature sensitive point can be easily set. For example, it is desirable to assume a temperature inside the joint space on the outer wall on the solar radiation side in summer and to set the temperature sensitive point higher than that.

  As a specific composition of the temperature-sensitive water-absorbing and draining polymer, for example, a resin that is polymerized and cross-linked using N-alkylacrylamide such as N-isopropylacrylamide as a main monomer is known.

  The storage bag 26 has a function of preserving at least water contained in the temperature-sensitive water-absorbing / draining polymer 24. Normally, it is formed of a material having good airtightness so that the internal moisture does not escape, and when the internal pressure reaches a certain level due to a fire, the internal water vapor can be released.

  According to the said structure, the temperature-sensitive drainage polymer 24 of the water retention member 22 is hold | maintaining without evaporating water below a temperature sensitive point. As shown in FIG. 3, the water retaining member 22 is located in the inner portion 6 b of the joint space, and the sealing material 8 and the backup material 10 protect the water retaining member from solar radiation in summer. Thereby, the water in a water retention member can be hold | maintained for a long period of time. Further, the backup material 10 blocks the radiant heat of the fire. When the temperature of the inner portion 6b of the joint space rises due to heat conduction, the moisture in the water retention member 22 evaporates first, and the heat of vaporization is taken away from the surroundings. Since the water retaining member 22 covers substantially the entire outer surface of the first metal fitting 14, the temperature of the first metal fitting 14 does not become higher than the boiling point of water unless substantially all of the water in the water retaining member evaporates. Thereby, the time for the first metal fitting 14 to reach a predetermined temperature can be delayed.

  The procedure for setting the amount of water in the water retaining member 22 will be described with reference to FIG. In the Building Standard Law, the panel of the outer wall W is heated under predetermined heating conditions, and the temperature rise of the inner part of the panel material mounting bracket is 180K or less (average temperature rise of the entire outer wall is 140K or less). The time that can be maintained must be longer than the prescribed time required by the Building Standards Act. Therefore, as shown in FIG. 5, the water retaining member 22 formed of a temperature-sensitive water-absorbing polymer in the fireproof joint structure 2 is a flat plate-like rectangular body, and is larger than the heat receiving surface so as to face one side surface that is the heat receiving surface. Assume a radiation surface R of area. Then, the amount of heat received by the temperature-sensitive water-absorbing polymer from the radiation surface during a predetermined time (1 hour as a calculation example) is offset by the heat of vaporization and the temperature rise, and the amount of water necessary for this is calculated. Ignore backup materials.

First, the heat of water evaporation is 2259 kJ / kg, and the specific heat of water is 4.184 kJ / kg ° C. The amount of heat required for 1 kg of water from 20 ° C. to 100 ° C. is 4.184 × (100−20) × 1 = 334.72 kJ (= Q _A ). Next, the amount of heat required to evaporate 1 kg of water is 2259 × 1 = 2259 kJ (= Q _B ). Accordingly, the amount of heat consumed before 1 kg of water at 20 ° C. evaporates is Q _A + Q _B = 334.72 + 2259 = 22593.72 kJ (= Q _C ).

The amount of heat incident on the temperature-sensitive water-absorbing polymer shown in FIG. 5 is given by the following equation. Where σ is the Stefan-Boltzmann constant 5.67 × 10 ⁻¹¹ (kw / m ² K ⁴ ), ε is the emissivity (= 1.0), φ is the form factor, and T _f is the radiation surface temperature. (K), T _i is the heat receiving surface temperature (K), and T _f is the ISO-834 heating curve temperature (in-furnace temperature).
[Formula 1] I = σε (T _f ⁴ −T _i ⁴ ) = 5.67 × 10 ⁻¹¹ × 1.0 × 0.967 × (T _f ⁴ −293 ⁴ )

The amount of heat received for 60 minutes is 321348.1 kw / m ² · s. The temperature-sensitive water-absorbing polymer has a height of 0.02 m, a length of 3 m, and a heat receiving area of 0.06 m ² . The amount of heat received by the temperature-sensitive water-absorbing and draining polymer is 321348.1 × 0.06 = 19280.9 kw · s = kJ (= Q _D ).

Thus, if one hour of radiant heat is to be absorbed by the latent heat and sensible heat of water, the required amount of water is Q _D / Q _A = 19280.9 / 2593.7 = 7.43 kg, and the volume is 0.3. It becomes 00743 m ³ . Since the area of the heat-receiving surface is 0.06 m ² , the depth of the temperature-sensitive water-absorbing and draining polymer is 0.00743 m ³ /0.06 m ² = 0.12 m.

  The thickness of the panel material is generally about 10 cm to 15 cm. Therefore, if the wall thickness is 13 cm or more, it is possible to provide a temperature-sensitive water-absorbing polymer having a depth of 12 cm in the joint space. If the wall thickness is less than that, place a light shielding material in front of the temperature-sensitive water-absorbing polymer to limit the amount of light received, or take measures such as increasing the volume at the back of the joint space as described below. Just do it.

  Other embodiments of the present invention will be described below. In these embodiments, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  6 and 7 show a second embodiment of the present invention. In this embodiment, the storage recess 30 is formed by cutting out a portion extending from the inside of the end surface 4U of the upper wall body to the lower portion of the inner surface of the upper wall body. By forming the storage recess 30, the inner portion 6 b of the joint space is enlarged, and the volume of the water retaining member can be increased. When the upper wall is supported by the spacer 20 so as to be able to swing, the housing recess 30 is provided except for the installation location of the spacer.

  8 and 9 show a third embodiment of the present invention. In this embodiment, the foam covering layer 32 is configured by applying a foam blocking material to a portion of the surface of the first metal fitting 14 exposed to the joint space. The foam coating layer is provided so as to foam at a temperature higher than the boiling point of water, and is formed so as to fill a space formed by the water retaining member 22 being degenerated by evaporation of moisture. The foam coating layer can be formed of a synthetic resin emulsion-based material or an epoxy resin-based material. As an example of the former, “SK Tyker Coat” (registered trademark) of SK Kaken Co., Ltd. or “Tycalit” (registered trademark) of Nippon Paint Co., Ltd. can be used.

  FIG. 10 is an operation explanatory diagram of the fourth embodiment of the present invention. In the present embodiment, the backup material 10 is formed of a thermally expandable refractory material. The configuration in the initial state (the state before expansion) is the same as that in FIG. As shown in FIG. 10, the surface sealing material 8 disappears due to the heat of the fire, and when the backup material reaches a certain temperature, the backup material 10 expands. As the heat-expandable refractory material, heat-expandable graphite can be used. The heat-expandable graphite has the characteristics that the expansion start temperature is low and the expansion coefficient is high, and the heat-expandable graphite having a known expansion start temperature of 130 to 150 ° C. or the expansion start temperature of 190 ° C. or less. Can be suitably used.

  In this embodiment, since the thermally expandable refractory material is in contact with the end faces 4L and 4U of the wall material from the beginning, the thermally expandable refractory material expands inward and outward in the joint space. The foaming start temperature of the thermally expandable refractory material is desirably about 180 ° C. Since this temperature exceeds the boiling point of water, the water in the water retention member 22 has evaporated, and the thermally expandable refractory material expands into the space created by the retraction of the water retention member. When the amount of the heat-expandable refractory material is increased, a part of the heat-expandable refractory material does not fit in the joint space and protrudes outside the wall. It is preferable to fix a part of the thermally expandable refractory material to the end face of the wall material by bonding or the like so that the heat-expandable refractory material does not fall out of the joint space. The thermally expandable graphite expands to form a heat insulating layer. When a part of the thermally expandable graphite protrudes outward, the region of the heat insulating layer existing outward from the embedded plate portion becomes longer.

  As a fifth embodiment of the present invention, the temperature-sensitive water-absorbing polymer of the water retaining member can be replaced with a water-containing inorganic substance. Since the external configuration is the same as that of the first embodiment, the above-described drawings (particularly FIGS. 6 and 7) are used.

Suitable hydrous minerals are aluminum hydroxide, dihydrate gypsum, magnesium hydroxide, boric acid and the like. The advantage of these water-containing minerals is that the water discharge function is not easily lost over a long period of time. As a specific application mode, a material in which a water-containing inorganic substance of sodium hydroxide is put in a container such as a bag or impregnated with rock wool (compressed material) is placed in the inner part 6b of the joint space. What is necessary is just to fill. The merit of using the hydrous inorganic material as a water retention material is that the water discharge function can be maintained over a long period of time. These hydrous inorganic substances cause a dehydration reaction by heating and release water.
2Al (OH) ₃ (s) → Al ₂ O ₃ + 3H ₂ O

The specific gravity of the aluminum hydroxide molecule is 2.42 g / cm and its molecular weight is 78. Since the molecular weight of water is 18, 2.42 × (0.5 × 3 × 18/78) = 0.837 g of water is released from 1 cm ³ of aluminum hydroxide. In order to store a sufficient amount of aluminum hydroxide in the joint space, it is preferable to form the storage recess 30 shown in FIGS. 6 and 7 on the end surface of the joint space.

  When aluminum hydroxide is used as a simple substance (powder), a dehydration reaction occurs at about 150 ° C. As described above, when trying to suppress the temperature rise of the metal fitting to 180 ° C. or less, it is sufficient that the endothermic reaction is exhibited at a temperature lower than 190 ° C. by setting the initial temperature of the metal to 10 ° C., so there is a sufficient margin. Moreover, normal aluminum hydroxide is about 1-70 micrometers, and reaction temperature becomes low, so that a particle size is large. When mixed with building materials such as fireproof coatings, the particle size is usually about 10 μm, but in the application of the present invention, the particle size should be 10 μm or more.

The reaction temperature of dihydrate gypsum (CaSO ₄ · 2H ₂ O) is 160 ° C to 170 ° C. Dihydrate gypsum and aluminum hydroxide may be mixed to form a molded product.

[Example 1]
As a 1st Example, as shown in FIG. 11, each wall body is each fixed to the beam B through the 1st metal fitting 14 as the panel material P, and the fireproof joint structure 2 is formed between each panel material. be able to.

[Example 2]
As a second embodiment, a target wall to which the present invention is applied can be a slide structure as shown in FIG. 12 instead of the above-described wall structure having a locking function. Specifically, the connecting metal fitting 12 is provided on the lower surface and the inner surface of the connecting portion of the two walls. As in the above-described embodiment, the connecting metal fitting is composed of the L-shaped first metal fitting 14 and the inazuma-shaped second metal fitting, and is an upper panel material with respect to the lower panel material (not shown). Is formed to be slidable in the left-right direction. A water retention member 22 is installed between the horizontal plate portion of the first metal fitting 14 and the lower end surface of each wall. In FIG. 12, drawing of the sealing member and the backup material is omitted, and a cross-sectional view of the joint portion is shown. The connecting fitting 12 is not provided through the entire length of each wall as in the previous embodiment, but it is sufficient if it is provided at a connecting portion between adjacent walls. What is necessary is just to fill the rock wool 36 in the joint space other than the installation location of the connection fitting.

  It should be noted that the embodiments and examples described in the present specification should not be construed as limiting, and the invention described in the claims of the present application is not limited to the nature of the invention. It is possible to implement according to the form.

2 ... Fireproof joint structure 4U, 4L ... End face 6 ... Joint space 6a ... Outer part 6b ... Back part 8 ... Sealing material 10 ... Closure member (backup material) 12 ... Connecting metal fitting 14 ... First metal fitting 14a ... Embedded plate part 14b ... Mounting plate part 16 ... Second metal fitting 18 ... 20 ... Spacer 22 ... Water retaining member 24 ... Temperature sensitive / drainage polymer 26 ... Storage bag 30 ... Storage recess 32 ... Foam coating layer 36 ... Rock wool R ... Radiation surface B ... Beam W ... Outer wall S ... Waist wall P ... Panel material

Claims (6)

A fireproof joint structure formed between opposing ends of a wall body such as at least two panel members connected in a vertical direction or a horizontal direction to constitute an outer wall of the structure,
Opposite end faces of both walls,
A connection fitting erected between the inner side of the structure among the opposite ends of the wall,
In order to protect the connection fitting from a fire outside the structure, the water retaining member filled at least in the inner part of the joint space except the outer part,
The connecting metal fitting includes a mounting plate portion that protrudes from one wall body to the other wall body, and an embedded plate portion that protrudes from the mounting plate portion into the back of the joint space and is fixed to the opposite end surface of the other wall body. Have
The water retaining member is formed of a material that releases almost no water below a certain temperature and releases above a certain temperature, and is configured to cover a portion of the surface of the connection fitting that is exposed to the joint space. Fireproof joint structure, characterized by   The fireproof joint structure according to claim 1, wherein a storage recess is formed in an inner portion of one of the opposing end surfaces of the both wall bodies, and the storage recess and the joint space are filled with the water retaining member.   The fireproof member according to claim 1 or 2, wherein the water retaining member is formed in a deep part of the joint space, and the joint space portion outside the water retaining member is closed with at least a blocking member that blocks radiant heat. Joint structure.   The fireproof joint structure according to claim 3, wherein the closing member (10) is made of a heat-expandable fireproof material.   The water retaining member is formed of a temperature-sensitive water-absorbing and draining polymer in a bag, and a portion of the surface of the connecting metal fitting facing the joint space is covered with a foam coating layer that is foamed by heat, and the foaming start temperature of the foam coating layer Is set to be higher than the temperature sensing point of the temperature-sensitive water-absorbing and draining polymer, and the void formed by shrinkage of the water retaining member due to evaporation of moisture is used as the expansion allowance of the foam coating layer. The fireproof joint structure according to any one of claims 1 to 4. 6. An outer wall in which the fireproof joint structure according to any one of claims 1 to 5 is formed between opposing end surfaces of a wall, and each wall is formed of a material having low thermal conductivity such as an ALC plate. An outer wall having a fireproof joint structure.

Images