JP2011038317A - Fire resistant covered wood and manufacturing method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire resistant covered wood which is formed by covering a long wooden base material having a rectangular cross section with a foamed fire resistant layer and has a structure good in fire resistance. <P>SOLUTION: A support sheet piece 4 having a same width as that of the external side of the foamed fire resistant layer 3 and bonded over the whole width of the external side is disposed on each of the external sides of the foamed fire resistant layer 3, so that almost the whole of the external sides of the foamed fire resistant layer 3 is covered with the support sheet pieces 4. In such a structure, the foamed fire resistant layer 3 is supported by the support sheet piece 4 from outside, whereby the foamed fire resistant layer 3 is hardly cracked, and the support sheet piece 4 is bonded to each of the external sides of the foamed fire resistant layer 3, so that the support sheet piece 4 can surely support the foamed fire resistant layer 3 without being damaged when a fire occurs. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fire-resistant coated wood obtained by coating the periphery of a wooden base material with a foam fire-resistant layer made of a foam fire-resistant material, and a method for producing the same.

  Patent Document 1 discloses a fireproof coated wood in which a wooden base material is covered with a foamed fireproof layer made of a foamed fireproof material. In such fireproof coated wood, the foamed refractory material of the foamed refractory layer foams and exerts a heat insulating action in the event of a fire, thereby protecting the wooden substrate from the flame.

JP-A-9-256506

  By the way, in general, foamed refractory material is a relatively brittle material, so in conventional fireproof coated wood, in the event of a fire, the foamed refractory material cannot follow the expansion and contraction of the wooden base material and the foamed refractory layer May crack. In particular, if the wooden base material shrinks greatly during a fire and causes dry cracks, large cracks are likely to occur in the foamed refractory layer. And when a foaming fireproof layer is cracking in this way, a flame will reach a wooden base material through a crack and sufficient fire resistance cannot be exhibited. In the fireproof coated wood described in Patent Document 1, in order to prevent cracking of the foam refractory layer, a non-combustible sheet is disposed inside the foam refractory layer (wood substrate side). Is not completely prevented.

  An object of the present invention is to provide a fireproof coated wood in which the periphery of a wooden base material is covered with a foamed fireproof layer, and has an excellent fire resistance.

  As a result of intensive studies to solve the above problems, the inventor joined a non-combustible sheet to the outer surface of the foamed refractory layer, and applied a compressive stress in the surface direction from the outside to the foamed refractory layer. The idea was to suppress the generation and expansion of cracks by adding them. However, since the volume of the foamed refractory layer may be 10 times or more due to foaming, simply wrapping the non-combustible sheet on the foamed refractory layer will cause the foamed refractory layer to foam from the inside of the incombustible sheet due to foaming of the foamed refractory layer. A tensile stress is generated in the non-combustible sheet by the pressure, the non-combustible sheet is damaged without being able to withstand the tensile stress, and the foamed refractory layer bonded to the non-combustible sheet is also cracked accordingly. Such a noncombustible sheet breakage due to a tensile stress is likely to occur at a corner portion of a base material where the tensile stress is particularly likely to be large in a long wooden base material having a rectangular cross section. And the inventor came to this invention after trial and error in order to suppress the crack of a foaming fireproof layer by making it hard to break a nonflammable sheet.

  The present invention is a fireproof coated wood obtained by coating a long wooden base material having a rectangular cross section with a foamed fireproof layer made of a foamed fireproof material. A fireproof coated wood characterized in that nonflammable support sheet pieces having substantially the same width as the side surfaces are joined to each outer surface to cover the foamed fireproof layer. In such a configuration, since the foamed refractory layer is supported from the outside by the support sheet piece, the foamed refractory layer is hardly cracked, and the generated crack is difficult to expand. In addition, each support sheet piece is bonded to each outer surface of the foamed refractory layer, and is not joined so as to straddle the corner portion of the foamed refractory layer. It will disperse | distribute substantially uniformly to the whole support sheet piece. For this reason, each support sheet piece which concerns on this invention can support a foaming fireproof layer reliably, without being damaged. Moreover, compared with the case where a nonflammable sheet is simply wound on a foamed fireproof layer, cracks at the corners of the wooden base material are less likely to occur, and sufficient fire resistance can be exhibited.

  In the present invention, it is proposed that a nonflammable corner reinforcing tape having a square cross section is joined to the corner portion of the foamed refractory layer along the longitudinal direction. In the present invention, the support sheet piece is joined to each outer side surface of the foamed refractory layer, and a joint of the support sheet piece is formed at the corner portion of the foamed refractory layer. By supporting the joints of the pieces with the corner reinforcing tape, cracks at the corners of the foam refractory layer can be reliably suppressed.

  In the present invention, another sheet or a layer structure can be further provided on the outer surface of the support sheet piece. For example, in order to further improve the fireproof performance, it is proposed to cover the outer surface of the support sheet piece with another foamed fireproof layer. It is also proposed to coat the outer surface of the support sheet piece with a finishing layer in order to improve the appearance. As the finishing layer, a flammable layer that does not interfere with foaming of the foamed refractory layer in the event of a fire is suitable. Specifically, wood, paper, synthetic resin sheet (especially thermoplastic layer is preferable), synthetic resin coating layer Etc. Moreover, even if it is a nonflammable thing, it can be used as a finishing layer, if it is damaged by the foaming pressure of the foamed refractory layer and does not hinder foaming.

  Further, in the present invention, the first foam refractory layer covering the periphery of the wooden base material and the first foam refractory layer bonded to each outer surface of the first foam refractory layer to cover the first foam refractory layer One support sheet piece, a second foam refractory layer that further covers the periphery of the wooden substrate from the outside of the first support sheet piece, and each outer surface of the second foam refractory layer are bonded to each other A second support sheet piece covering the second foam refractory layer, and a plurality of first support sheet pieces are arranged along the longitudinal direction on each outer surface of the first foam refractory layer. A configuration is proposed in which the second support sheet piece is arranged so as to cover the seam between the first support sheet pieces. In such a configuration, since the wooden base material is covered with the two foamed fireproof layers, the flame does not reach the wooden base material only by cracking the foamed fireproof layer on one side. And since the 2nd support sheet piece is arrange | positioned so that the joint of the 1st support sheet piece may be covered, a flame cannot penetrate | invade easily from the joint of the support sheet piece, and it covers two layers of fire-resistant layers There is an advantage that cracks are hardly generated.

  Another aspect of the present invention includes a step of forming a foam refractory layer made of a foam refractory material around a long wooden substrate having a rectangular cross section, and an outer surface of the foam refractory layer. A non-flammable support sheet piece having substantially the same width as the side surface is joined to each outer surface to cover the outer surface of the foamed refractory layer. is there. According to this manufacturing method, the fireproof coated wood of the present invention can be easily manufactured.

  As described above, the fire-resistant coated wood of the present invention has fire resistance superior to that of the conventional configuration because it is in a fire and can reliably prevent the foam coating layer from being cracked by the support sheet piece. Therefore, if the fireproof covering wood of this invention is used, the wooden building excellent in fire resistance is realizable. Moreover, according to the manufacturing method of the fireproof covering wood of this invention, it becomes possible to manufacture such fireproof covering wood easily.

1 is a perspective view showing a structure of fireproof coated wood 1 of Example 1. FIG. 1 is a cross-sectional view of a fireproof coated wood 1 of Example 1. FIG. 1 is an enlarged longitudinal sectional view of a fireproof coated wood 1 of Example 1. FIG. It is a perspective view which shows the structure of the fireproof covering wood 1a of Example 2. FIG. It is a cross-sectional view of the fireproof coated wood 1a of Example 2. It is a perspective view which shows the structure of the fireproof covering wood 1b of Example 3. FIG. It is a cross-sectional view of the fireproof coated wood 1b of Example 3. It is a cross-sectional view of the fireproof coated wood 1c of Example 4. 6 is an enlarged longitudinal sectional view of a fireproof coated wood 1d of Example 5. FIG. (A) is a cross-sectional view of the fireproof coated wood 1b of Example 3, (b) is a cross sectional view of the fireproof coated wood 1e of Comparative Example 1, and (c) is the fireproof coated wood 1f of Comparative Example 2. FIG. It is a graph which shows the result of a combustion test.

  The material of the wooden base material according to the present invention is not particularly limited, and a wide variety of wood used in wooden construction can be widely used. Specific examples include pine, cypress, cedar and asunalo. Glulam and synthetic wood can also be used. Examples of the use of the wooden base material include wooden pillars and beams. Although the size of a wooden base material is not specifically limited, The size (5-20 cm square) of the wooden prism of a general house is suitable.

  As the foamed refractory material according to the present invention, a material having nonflammability and foaming and exhibiting a heat insulating action when exposed to a fire flame can be widely used. From the viewpoint of protecting the wooden substrate from fire, it is desirable to use a foamed refractory material having a foaming start temperature equal to or lower than the ignition point of wood. Moreover, it is desirable that the foamed refractory material has a property as a paint from the viewpoint of workability. Specific examples include fireproof paints described in JP2001-040290A and JP2004-339712A.

  The support sheet piece according to the present invention is preferably non-flammable and has a physical strength capable of supporting the foamed refractory material in a fire. Specific examples include fiber sheets of noncombustible materials such as glass fiber sheets, mineral fiber sheets, and carbon fiber sheets, untwisted paper containing 80% or more of noncombustible materials, and metal mesh sheets. The same material can also be used for the corner reinforcing tape according to the present invention. Although the length of a support sheet piece is not specifically limited, Since the tensile stress added from a foaming fireproof layer becomes strong, so that it is long, it is preferable to set it as about 20-40 cm length. In addition, it is desirable to prevent the flame from entering from the joint portion by overlapping the end portions of the support sheet piece or filling the joint with a foamed refractory layer at the joint portion of the support sheet piece.

  When forming a foam refractory layer around a wooden base material, the outer side of the wooden base material may be coated with a foam refractory material, or a layered foam refractory material is applied to the outer side of the wooden base material. You may do it. An adhesive layer and other sheets can be interposed between the wooden base material and the foamed refractory layer as necessary.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the fireproof covering wood in this invention can add a various change in the range which does not deviate from the summary of not only the form of an Example but this invention.

<Example 1>
As shown in FIGS. 1 and 2, the fireproof coated wood 1 of the present embodiment includes a long wooden base material 2, a foamed fireproof layer 3 covering the outer periphery of the wooden base material 2, and the foamed fireproof layer 3. And a plurality of support sheet pieces 4 to be coated.

  The wooden substrate 2 is a cedar prism having a square cross section, and the dimensions are about 10 cm long × 10 cm wide × about 3 m high.

The foamed refractory layer 3 has a thickness of 2 mm, is made of a foamed refractory material 6, is directly bonded to the outer surface of the wooden substrate 2, and covers the entire outer periphery of the wooden substrate 2 without any gaps. This foamed refractory material 6 starts to foam at about 230 ° C. below the cedar ignition point, and expands 10 to 20 times when there is no external restriction to exert a heat insulating effect. The foam refractory material 6 is a paint having the following composition, and the foam refractory layer 3 is formed by directly applying and drying the foam refractory material 6 diluted with water on the outer surface of the wooden substrate 2.
Pentaerythritol: 100 parts by weight Melamine: 100 parts by weight Vinyl acetate / acrylic Em (solid content): 350 parts by weight Ammonium polyphosphate: 450 parts by weight Titanium dioxide: 200 parts by weight

  The support sheet piece 4 is a piece of paper obtained by cutting a 0.25 mm-thick magnesium silicate mixed paper (non-twisted paper (GP) Grandex Co., Ltd.) into a rectangular shape having a width of about 10 cm and a length of about 30 cm. The width of each support sheet piece 4 is set to be equal to the width of the outer surface of the foam refractory layer 3, and as shown in FIG. 2, the outer surface of the foam refractory layer 3 is joined so as to cover the entire width. In addition, each outer surface of the foamed refractory layer 3 is covered with a separate support sheet piece 4. On the other hand, as shown in FIG. 1, the support sheet piece 4 is arranged in a tile shape in a row along the vertical direction for each outer side surface of the foamed refractory layer 3 and covers the entire outer side surface. The foamed refractory material 6 was used as an adhesive for joining each support sheet piece 4 and the foamed refractory layer 3. That is, the water-diluted foam refractory material 6 is applied to the outer surface of the foam refractory layer 3 formed around the wooden base material 2, and the support sheet piece 4 is placed thereon, and the foam refractory material 6 is dried in this state. The foamed refractory layer 3 and the support sheet piece 4 were joined. Further, as shown in FIG. 3, the support sheet piece 4 is disposed on each outer surface of the foamed refractory layer 3 and is flush with the respective end portions. The joints of the support sheet pieces 4 are filled with the foamed refractory material 6, thereby reinforcing the joints of the support sheet pieces 4 so as not to invade the flames and making the joints flat.

  In the fireproof coated wood 1 of the present embodiment, the foamed refractory layer 3 is hardly cracked because the foamed refractory layer 3 is supported in the surface direction by the support sheet piece 4 from the outside. Moreover, since the support sheet piece 4 coat | covers the foam refractory layer 3 for every outer surface, the tensile stress added from the foam refractory layer 3 will be disperse | distributed to the whole sheet piece, without concentrating locally. . For this reason, according to the present Example, a foam refractory layer can be supported reliably, without being damaged at the time of a fire.

<Example 2>
As shown in FIGS. 4 and 5, the fireproof coated wood 1 a of Example 2 is obtained by partially changing the configuration of Example 1 and joining the corner reinforcing tape 5 to the corners of the foamed fireproof layer 3. This square reinforcing tape 5 is a long tape obtained by cutting the same non-combustible magnesium silicate mixed paper as the support sheet piece 4 into a width of 2 cm. Before forming the foam refractory layer 3 on the wooden substrate 2, It is bent in a cross-sectional shape and bonded to the four corners of the wooden substrate 2 along the longitudinal direction. And the corner reinforcement tape 5 is joined to the corner | angular part of the foam refractory layer 3 from the inside by forming the foam refractory layer 3 on the circumference | surroundings of the wooden base material 2 from this corner reinforcement tape 5. FIG. Moreover, although the support sheet piece 4 has joined to each outer side surface of the foaming fireproof layer 3, since it is the same as that of the said Example 1 except for the structure except the square reinforcement tape 5, description is abbreviate | omitted. Thus, in this embodiment, since the corner reinforcing tape 5 is joined to the corner portion of the foam refractory layer 3 corresponding to the joint of the support sheet piece 4, the corner portion of the foam refractory layer 3 is cracked. It can be surely suppressed. In this embodiment, the corner reinforcing tape 5 is joined to the inside of the foamed refractory layer 3, but the corner reinforcing tape according to the present invention is joined to the outside of the foamed refractory layer so as to overlap the support sheet piece. You can also.

<Example 3>
In Example 3, as shown in FIGS. 6 and 7, the wooden substrate 2 is covered with two layers of fire-resistant layers 3a and 3b. Specifically, the fire-resistant coated wood 1b of this example is obtained by coating the fire-resistant coated wood 1b (see FIGS. 4 and 5) of Example 2 with the second foamed fire-resistant layer 3b, and further covering the fire-coated wood 1b. The two support sheet pieces 4b are joined and covered. That is, as shown in FIGS. 6 and 7, the fireproof coated wood 1b of the present embodiment covers the long wooden base material 2 and the outer periphery of the wooden base material 2 in the same manner as in the second embodiment (first). 1) a foam fireproof layer 3a and a plurality of (first) support sheet pieces 4a covering the (first) foam fireproof layer 3a. Moreover, the corner reinforcement tape 5 is joined to the corner | angular part of the 1st foam refractory layer 3a from the inner side. Since these configurations are the same as those of the second embodiment, detailed description thereof is omitted.

  The second foamed refractory layer 3b is formed on the outer side of the first support sheet piece 4a and covers the entire outer periphery of the wooden substrate 2 without any gaps. The second foamed refractory layer 3b is composed of the foamed refractory material 6 having the same thickness of 1 mm as the first foamed refractory layer 3a. Like the first foamed refractory layer 3a, the foamed refractory material diluted with water is used. 6 is applied to the outer surface of the support sheet piece 4a and dried.

  The second support sheet piece 4b is a non-combustible paper piece of the same shape and material as the first support sheet piece 4a, and is similar to the first support sheet piece 4a, outside the second foam refractory layer 3b. Each side surface is joined in a line along the longitudinal direction to cover the entire outer surface of the second foamed refractory layer 3b. Moreover, the 2nd support sheet piece 4b is affixed so that the edge part which adjoins may be faced | matched like the 1st support sheet piece 4a, and the fireproof material 6 is filled in the joint. Is done. In addition, as shown in FIG. 6, the first support sheet piece 4a and the second support sheet piece 4b are long so that the second support sheet piece 4b covers the joint of the first support sheet piece 4a. Staggered in the direction.

  Thus, in Example 3, since the wooden base material 2 is covered with the two foamed fireproof layers 3a, 3b, even if cracks occur in one of the foamed fireproof layers 3a, 3b, the other foamed fireproof layer 3a, The wooden substrate 2 can be protected from the flame by 3b. In particular, the support sheet pieces 4a and 4b joined to the outer surfaces of the respective foam refractory layers 3a and 3b are alternately stacked in the longitudinal direction, and the seams do not overlap in the thickness direction. There is an advantage that the flame hardly enters from the joint, and that cracks straddling the two foamed refractory layers 3a and 3b hardly occur.

<Example 4>
In Example 4, as shown in FIG. 8, the configuration of Example 1 is partially changed, and a corrugated support sheet piece 4 c is joined to the outer surface of the foamed refractory layer 3. Moreover, the groove part of the outer surface of the support sheet piece 4c is filled with the foamed refractory material 6 so that the surface of the fireproof coated wood 1c becomes flat. When the corrugated support sheet piece 4c is employed as in the present embodiment, the support sheet piece 4c becomes rich in elasticity, and is less likely to be damaged by the tensile stress in the surface direction.

<Example 5>
The fireproof coated wood 1d of Example 5 is partly modified from the structure of Example 1 above, and as shown in FIG. 9, the support sheet pieces 4 are foamed and fireproof so that the end portions thereof overlap each other at the joint portion. It is arranged on the outer surface of the layer 3. If the end portion of the support sheet piece 4 is overlapped at the seam portion as in the present embodiment, the flame is less likely to enter from the seam than the configuration in which the end portion is abutted at the seam portion (see FIG. 3). .

<Comparative Example 1>
In order to evaluate the fire resistance of the fire-resistant coated wood of the present invention, as shown in FIG. 10 (b), the foamed fire-resistant material 6 diluted with water is applied and dried around the same wooden substrate 2 as in the above example. One layer of fire-resistant fired layer 3 was formed to produce fire-resistant coated wood 1e of Comparative Example 1. Here, in Comparative Example 1, the thickness of the foam refractory layer 3 is the same as the total thickness of the foam refractory layers 3a, 3b and the support sheet pieces 4a, 4b according to Example 3 (see FIG. 10A). Was set to be.

<Comparative Example 2>
As shown in FIG. 10 (c), the foamed refractory material 6 diluted with water is applied and dried on the outer surface of the same wooden substrate 2 as in the above embodiment to form one foamed refractory layer 3, A support sheet piece 4d was joined to the entire outer surface of the foamed refractory layer 3 to produce a fireproof coated wood 1f of Comparative Example 2. Here, the support sheet piece 4d according to Comparative Example 2 is the same thickness and the same material as the support sheet piece 4 of the example, and has the same width dimension as the outer peripheral length of the foamed refractory layer 3, The support sheet piece 4d was joined to cover the entire circumference of the foamed refractory layer 3 instead of joining each outer surface of the foamed refractory layer 3. In addition, the total thickness of the foamed refractory layer 3 and the support sheet piece 4 according to this example is the total thickness of the foamed refractory layer 3a, 3b and the support sheet piece 4a, 4b according to Example 3 (see FIG. 10A). Was set to be the same.

<Combustion test>
The fireproof coated woods 1b, 1e, and 1f of Example 3 and Comparative Examples 1 and 2 were each cut to a height of 1.2 m and used as samples for a combustion test. In each sample, a thermocouple for measuring the surface temperature was embedded in the surface of the wooden substrate 2 in advance. In the combustion test, each sample was placed in a gas furnace, and 10 cm from the upper and lower ends of each sample was covered with glass wool having a thickness of 3 cm. After each sample was installed in the gas furnace, the gas furnace was ignited and the standard heating temperature curve of ISO834 was heated for 30 minutes. The measurement result of the surface temperature of the wooden base material of each sample and the furnace temperature is shown in FIG.

  From FIG. 11, it can be seen that the surface temperature of the wooden substrate in the example is clearly lower than that in Comparative Example 1 and Comparative Example 2. Specifically, the time to reach the cedar ignition point (about 260 ° C.) is about 3 minutes after the start of heating in the sample of Comparative Example 1, while about 13 minutes in Comparative Example 2, The sample of Example 3 is after about 14 minutes. In the sample of Comparative Example 2, the support sheet piece 4d was damaged and the foam refractory layer 3 was cracked in the region of about 230 to 300 ° C., which is the temperature at which the foam refractory layer 3 particularly foams, and then suddenly The temperature is rising. On the other hand, the sample of Example 3 does not break into the support sheet pieces 4a and 4b and the temperature rises moderately even in the region of about 230 to 300 ° C., which is the temperature at which the foamed refractory layer 3 particularly foams. And when the temperature after 30 minutes is compared, there is a temperature difference of about 200 ° C. between the sample of Comparative Example 2 and the sample of Example 3. This result has shown that the fireproof covering wood of an Example has the outstanding fire resistance compared with the conventional fireproof covering wood.

1, 1a, 1b, 1c, 1d, 1e, 1f Fireproof coated wood 2 Wooden base material 3, 3a, 3b Foamed fireproof layer 4, 4a, 4b, 4c, 4d Support sheet piece 5 Square reinforcing tape 6 Foamed fireproof material

Claims (4)

A fireproof coated wood formed by coating the periphery of a long wooden base material having a rectangular cross section with a foamed fireproof layer made of foamed fireproof material,
On the outer surface of the foamed refractory layer, a nonflammable support sheet piece having substantially the same width as each outer surface is bonded to each outer surface to cover the foamed refractory layer. wood.   The fireproof coated wood according to claim 1, wherein a nonflammable corner reinforcing tape having a square cross section is joined to the corner portion of the foamed fireproof layer along the longitudinal direction. A first foam refractory layer covering the periphery of the wooden substrate;
A first support sheet piece that is bonded to each outer surface of the first foam refractory layer to cover the first foam refractory layer;
From the outside of the first support sheet piece, a second foam fireproof layer further covering the periphery of the wooden substrate,
A second support sheet piece that is bonded to each outer side surface of the second foam refractory layer and covers the second foam refractory layer;
A plurality of first support sheet pieces are arranged along the longitudinal direction on each outer surface of the first foam refractory layer, and the second support sheet pieces are disposed between the first support sheet pieces. The fireproof coated wood according to claim 1 or 2, wherein the fireproof coated wood is arranged so as to cover a seam. Forming a foam refractory layer made of a foam refractory material around a long wooden base material having a rectangular cross section;
A non-flammable support sheet piece having substantially the same width as each outer surface is bonded to the outer surface of the foam refractory layer for each outer surface to cover the outer surface of the foam refractory layer. A method for producing fire-resistant coated wood characterized by:

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