JP2016083086A - Fire spread prevention method and non-combustible material sheet used there - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire spread prevention method by which, even when fire occurs in a part of a combustible material (curing sheet 2), spreading of the fire to another area in the combustible material can be automatically inhibited.SOLUTION: A noncombustible material sheet 10 is arranged so as to cover a combustible material (curing sheet 2). In the event of a fire occurring in a part of the combustible material, the fire is inhibited from being further spread in the combustible material by means of an action of the arranged incombustible material sheet 10. Preferably, the incombustible material sheet 10 having a larger width than that of the combustible material 2 is used, the incombustible material sheet 10 is arranged with respect to the combustible material 2, and then both side edges 13 are fixed with appropriate fixing tools (a peg 4 or a weight 5).SELECTED DRAWING: Figure 4

Description

  The present invention relates to a flame spread prevention method capable of preventing a flame from spreading to other areas of the combustible material when a part of the combustible material is combusted, and a non-combustible material sheet used therein.

  When a flame occurs in a part of the combustible material having a required area, it is not easy to prevent the generated flame from spreading to other areas of the combustible material. Fire extinguishment is possible and easy if it can be detected early, but in places where there are no people nearby, the discovery becomes slow, the fire burns around the entire combustible material, making it difficult to extinguish, and the loss of the entire combustible material It becomes.

  When building a new building, concrete foundation work is performed at the construction site. Generally, it is necessary to cure the concrete after placing, and for this purpose, a method of covering the entire concrete foundation with a resin sheet (curing sheet) is adopted.

  In an environment where the temperature is low such as in winter, the concrete being cured may freeze. In order to avoid this, after covering with a curing sheet, seal the periphery of the curing sheet by placing soil, etc., and blow the air at the required temperature into the curing sheet with a blower to make the curing sheet into a dome shape. A curing method for inflating has been proposed (Patent Document 1). In addition, an electrothermal curing sheet with a built-in PTC heater is arranged around the formwork after placing the concrete, and the entire concrete placing part including the formwork on which the electrothermal curing sheet is arranged is covered with a heat insulating sheet. A method of curing concrete by heating control has also been proposed (Patent Document 2).

JP 2001-247384 A JP 2001-48675 A

  As a curing sheet used for curing concrete, a flammable resin sheet is generally used in relation to cost. Usually, at the site where concrete foundations are constructed, there are few people at night. For this reason, when the curing sheet is ignited for some reason, there is a high probability that the discovery will be delayed and the flame will spread to the entire curing sheet. In addition, as described in Patent Document 1 and Patent Document 2, when using a curing sheet equipped with a hot air generator or electric heating means, it is completely denied that ignition occurs due to these heat sources. Can not. Even if ignition occurs and partial combustion begins, if the combustion can be limited to a limited area without active fire extinguishing, that is, if the spread of fire can be prevented, the loss due to combustion Can be reduced to some extent. However, for example, in the current usage mode of the curing sheet, such means or method for preventing the spread of fire is not adopted.

  The present invention has been made in view of the circumstances as described above, and is not limited to a curing sheet at a concrete curing site, and in general, combustible materials, even in the event of a partial fire, the flame causes the problem. It is an object of the present invention to provide a fire spread prevention method that can automatically prevent the other areas of the combustible material from spreading. Moreover, it makes it a subject to provide the sheet | seat made from a nonflammable material for fire spread prevention used there.

  The present inventors have conducted many experiments to solve the above-mentioned problems, and by arranging the non-combustible material sheets so as to overlap the combustible material, they occurred in a part of the combustible material. We have experienced that it is possible to effectively prevent the flame from spreading to other areas, that is, to spread fire. In particular, when the combustible material and the non-combustible material sheet disposed on the combustible material are in close contact or almost in close contact with each other, it has also been experienced that fire spreading can be more effectively prevented. The present invention is based on the above findings obtained by the present inventors.

  That is, in the method for preventing the spread of fire according to the present invention, basically, a non-combustible material sheet is disposed on the combustible material, and when a portion of the combustible material is ignited, the non-combustible material sheet is disposed. By the action, further spreading of the combustible material is prevented.

  In the present invention, the spread of fire can be prevented because oxygen (air) is not sufficiently supplied between the combustible material and the noncombustible material sheet disposed thereon, and the presence of the noncombustible material sheet exists below. The reason is that the temperature of the combustible material located in is difficult to reach the ignition temperature, and that even if the flame jumps, it will not lead to the ignition of the combustible material in the case of a spark on the non-combustible material sheet it is conceivable that.

  One aspect of the method for preventing the spread of fire according to the present invention is characterized in that a plurality of non-combustible material sheets are arranged with a required gap with respect to the combustible material.

  Although the sheet made of non-combustible material depends on the material of the selected sheet, it is generally more expensive than the case where the combustible material is a curing sheet for concrete curing, for example. Therefore, high costs are required if an incombustible material sheet is placed on the entire surface of the combustible material. Therefore, by arranging the non-combustible material sheet with a necessary gap, the necessary cost can be reduced. The combustible material in the gap portion may spread, but even if it spreads, it is sufficient to repair only that portion, which leads to cost reduction.

  Moreover, in one aspect of the method for preventing the spread of fire according to the present invention, a non-combustible material sheet having a width larger than the width of the combustible material is used, and the side edges of the combustible material are covered with the non-combustible material sheet. The noncombustible material sheet is disposed on the combustible material.

  In this aspect, when the combustible material ignites and spreads in the lateral direction, even the side edge portion of the combustible material is covered with the non-combustible material sheet, so that the fire spread preventing effect is further improved.

  Moreover, in one aspect of the method for preventing fire spread according to the present invention, the method further includes the step of fixing the side edge portion of the non-combustible material sheet disposed with an appropriate fixing tool after the non-combustible material sheet is disposed on the combustible material. It is characterized by.

  In this aspect, since the side edge of the non-combustible material sheet is fixed to the ground or the like by a fixture that is a weight such as a peg or a stone, the non-combustible material sheet is turned up or scattered by wind or the like. Can be prevented.

  In one aspect of the method of preventing fire spread according to the present invention, the non-combustible material sheet to be disposed includes a weight in place, and when the non-combustible material sheet is disposed on the combustible material, the non-combustible material sheet It is characterized by using a sheet made of non-combustible material so that tension in a direction in close contact with the combustible material is generated by the action.

  When the non-combustible material sheet is placed against the combustible material, the non-combustible material sheet is blown by wind or the like, and the adhesion between the combustible material and the non-combustible material sheet becomes insufficient. If air enters, there is a fear that the fire spread prevention effect may be reduced. In addition, when the combustible material is partially combusted, there is a risk of thermal expansion of the nearby incombustible material sheet due to the heat of combustion. There is a risk that the adhesion between the layers becomes insufficient, and the effect of preventing the spread of fire is reduced.

  In the method for preventing the spread of fire in the above aspect, the non-combustible material sheet is provided with a weight at an appropriate position, and the non-combustible material sheet is in close contact with the combustible material by the action of the weight when the weight is in place. A non-combustible material sheet is used that is tensed in the direction. Due to the action of the weight, lifting due to the wind can be prevented, and the required tension is generated even when thermally expanded, thereby ensuring the adhesion between the combustible material and the non-combustible material sheet. Therefore, a higher fire spread prevention effect can be expected.

  The present invention also discloses a non-combustible material sheet comprising at least a non-combustible material sheet body and weights provided near both ends of the sheet body in the width direction.

  In this invention, there is no restriction | limiting in particular in a combustible material, The fire spread prevention method by this invention can be applied to a combustible material generally. As an example of the combustible material, a curing sheet used for curing concrete placed on site can be cited. Other examples of the combustible material include an electric heater mat.

  In the present invention, examples of the sheet main body constituting the non-combustible material sheet include a sheet made of a material that does not burn by fire heat in a normal fire, which is defined by the Building Standard Law. As an example, a glass fiber, a sheet | seat made from a silicon resin, a metal film etc. are mentioned. Moreover, the composite material, for example, a flexible and thin sheet in which a glass fiber is coated with a silicon resin can be exemplified. More specifically, a heat insulating material for a canopy described in Japanese Patent No. 3470810, a non-combustible sheet material described in Japanese Patent No. 4186488, a non-combustible material described in Japanese Patent Application Laid-Open No. 2001-31235, or Japanese Patent Application Laid-Open No. 2001-31235. Nonflammable sheet materials described in 2003-276113 can be exemplified.

  By adopting the method for preventing the spread of fire according to the present invention, and by using the non-combustible material sheet according to the present invention, even if the discovery of a fire is delayed, the flame spreads around the entire combustible material. It becomes possible to stop automatically, and the loss due to fire can be reduced.

Two figures which show an example of the sheet | seat made from a noncombustible material. The figure for demonstrating the state which applied the fire spread prevention method by this invention with respect to the curing sheet used for curing of the cast concrete. Sectional drawing which follows the aa line of FIG. The figure for demonstrating the other state which applied the fire-spreading prevention method by this invention with respect to the curing sheet used for curing of the cast concrete. Sectional drawing which follows the aa line of FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an example of a non-combustible material sheet according to the present invention. A sheet 10 made of incombustible material shown in FIG. 1A is composed of a sheet body 11 made of rectangular incombustible material, and weights 12 and 12 made of a noncombustible material attached in the vicinity of both ends in the longitudinal direction. The Although the non-combustible material sheet 10 is not limited, in this example, it is a rectangle of about 1 m × 2 to 4 m, and a weight 12 made of metal or a brick material is provided near the end in the longitudinal direction from the end. It is fixed to the sheet body 11 at a position of about 30 cm with an adhesive, screwing, or eyelet. The sheet body 11 is made of a sheet made of a noncombustible material, and here, a glass fiber woven cloth coated with a silicon resin is used.

  The sheet 20 made of non-combustible material shown in FIG. 1B has a size of about 8 m × 10 m, and the sheet body 21 is made of a glass fiber woven cloth coated with a silicon-based resin. This incombustible material sheet 20 is not provided with the above-described weight.

  Of course, the size and shape of the non-combustible material sheets 10 and 20 are arbitrary, and may be appropriately set according to the site where the non-combustible material sheets 10 and 20 are used. It may be circular or elliptical, or polygonal.

  FIG. 2 shows an example of a construction site to which the method for preventing fire spread according to the present invention is applied. Here, in the event that the curing sheet 2 placed on the concrete foundation 1 on-site is ignited, the fire spread prevention method according to the present invention is applied in order to prevent the fire spread. In FIG. 2, reference numeral 1 denotes a concrete foundation that has been cast in the field, and although omitted in the drawing, formwork is attached to both sides of the concrete foundation 1. A concrete sheet 1 including a formwork is covered from above, and a curing sheet 2 is covered over the whole, and the curing sheet 2 is covered so as to cover the curing sheet 2 as shown in FIG. Are arranged with the required gap P maintained.

  As shown in FIG. 3, which is a cross-sectional view taken along line aa in FIG. 2, in this example, the curing sheet 2 is in a state of being laid on the concrete foundation 1. Above, the above-mentioned non-combustible material sheet 10 is further laid. The seat 10 made of incombustible material is in a state where tension is generated downward due to the action of the weights 12 and 12 attached in the vicinity of both ends in the longitudinal direction. The sheet 10 is in close contact with the curing sheet 2.

  In the state shown in FIG. 2, it is assumed that a flame has occurred in the curing sheet 2 in the region indicated by S in FIG. Usually, the curing sheet 2 is a combustible material, the flame propagates in the surface direction of the curing sheet 2, and the curing sheet 2 spreads. However, when the flame reaches the area covered with the non-combustible material sheet 10, or just before that, the spreading of the curing sheet 2 stops. The reason is that the curing sheet 2 and the incombustible material sheet 10 are in close contact with each other, and there is not enough oxygen (air) to maintain combustion between them, and the incombustible material sheet 10 is present. It is difficult for the temperature of the curing sheet 2 located below it to reach the ignition temperature, and further, even if the flame jumps, it does not lead to the ignition of the curing sheet 2 in the case of a spark on the non-combustible material sheet 10 , Etc.

  In the example shown in FIG. 2, it is inevitable that the area of the curing sheet 2 exposed between the two non-combustible material sheets 10, 10 is burnt down by fire spreading, but the presence of the non-combustible material sheets 10, 10 is present. Thereby, it can avoid that the area | region other than that of the curing sheet 2 burns down. After repairing only the part that has been burned down after the fire extinguishes, the curing of the concrete after that can be continued as it is, and compared with the case where the entire curing sheet 2 is burnt down, a significant cost saving is achieved. .

  The relationship between the height of the concrete foundation 1 from the ground and the width of the non-combustible material sheet 10 is arbitrary. However, as shown in FIG. It is preferable that the area of the sheet 2 that is in contact with the ground surface can be contacted, and the weight 12 has a length that is a predetermined distance (for example, about 5 cm) from the ground surface.

  The reason is that, in the normal case, the presence of the weight 12 can prevent the bottom of the non-combustible material sheet 10 from fluttering due to the wind, and in the unlikely event that a fire occurs and the non-combustible material sheet 10 is generated by the heat of the flame. This is to prevent the weight 12 from coming into contact with the ground due to the stretching even if it is stretched. If the weight 12 comes into contact with the ground at the time of stretching, sagging occurs in the non-combustible material sheet 10, and a space is formed between the curing sheet 2, and air may enter the space, preventing the spread of fire. is there.

  4 and 5 illustrate another example in which the method for preventing fire spread according to the present invention is applied to a curing sheet used for curing a placed concrete. In this example, as the non-combustible material sheet 10, a sheet having a width larger than the width of the curing sheet 2 which is a combustible material is used. And the sheet | seat 10 made from a nonflammable material is arrange | positioned with respect to the curing sheet 2 so that the area | region of the both-sides edge parts 3 and 3 of the curing sheet 2 may also be in the state covered with the sheet | seat 10 made from a nonflammable material. Further, although not essential, after the non-combustible material sheet 10 is arranged as described above, the peg 4 or the like is driven into the side edges 13 and 13 of the non-combustible material sheet 10 or a weight 5 such as a stone is placed. Thus, both side edges 13 and 13 of the non-combustible material sheet 10 are fixed to the ground. In the example shown in FIGS. 4 and 5, the other members are the same as those shown in FIGS. 2 and 3, and the description is omitted by giving the same reference numerals.

  In this embodiment, when a flame is generated in the curing sheet 2 in the region indicated by S in FIG. 4, it is reliably prevented from spreading in the lateral direction through the regions of the side edges 3 and 3 of the curing sheet 2. Can do. In addition, since the side edge 13 of the non-combustible material sheet 10 is fixed to the ground by a fixture that is a weight 5 such as a peg 4 or a stone, the non-combustible material sheet 10 is turned up or scattered by wind or the like. Can be prevented. Thereby, the fire spread prevention effect is further ensured.

  Although not shown, a plurality of non-combustible material sheets 10 may be hung so as to cover the entire curing sheet 2 without leaving a gap. In that case, it is possible to prevent the spread of fire regardless of where the fire is generated from the curing sheet 2. Moreover, even if it uses the sheet | seat 10 made from a nonflammable material which does not have the weight 12 as shown to Fig.1 (a), a certain fire spread prevention effect can be raised. What is necessary is just to select suitably from a viewpoint of cost effectiveness.

Examples will be described below.
[Example 1]
As a sheet body made of incombustible material, Fujimori Kogyo Co., Ltd., Fuji Ace, type FG4010 (glass cloth + heat resistant paint) was used. This is cut to a length of 2 m and a width of 90 cm, and at a position of 30 cm from both sides in the length direction, a brass having a thickness of 5 mm, a length of 90 cm, and a width of 5 cm has a diameter of 6 mm. A hole was made and fixed with rivets. This corresponds to the “non-combustible material sheet” in the present invention.

  A polyethylene sheet (1.85 m × 4 m) was used as the “combustible material”. The polyethylene sheet was laid on a concrete foundation having a height of 60 cm and a width of 400 cm, and the above-described noncombustible material sheet was placed thereon, and the end of the polyethylene sheet was lit. Although the fire spread toward the non-combustible material sheet, the fire was extinguished 10 cm from the edge of the non-combustible material sheet.

[Example 2]
The material of the non-combustible material sheet body is the same as in Example 1, but the sheet width was 20 cm. A weight made of brass having a thickness of 5 mm, a length of 10 cm, and a width of 5 cm was fixed at a position of 30 cm from both sides in the length direction. This corresponds to the “non-combustible material sheet” in the present invention.

  As an equivalent to “combustible material”, a vinyl chloride sheet was used, laid on a concrete foundation, the above-mentioned non-combustible material sheet was placed thereon, and the end of the vinyl chloride sheet was ignited. Although the fire spread toward the non-combustible material sheet, the fire was extinguished at 5 cm from the edge of the non-combustible material sheet.

  DESCRIPTION OF SYMBOLS 1 ... Concrete foundation, 2 ... Curing sheet, 3 ... Side edge part of curing sheet, 4 ... Peg (fixing tool), 5 ... Stone (fixing tool), 10, 20 ... Sheet of incombustible material, 11, 21 ... Sheet main body , 12 ... weight, 13 ... side edge of the sheet made of non-combustible material.

Claims (7)

  Arranging a non-combustible material sheet on the combustible material, and preventing further fire spread in the combustible material by the action of the arranged non-combustible material sheet when ignition occurs in a part of the combustible material A method for preventing the spread of fire.   The fire spread prevention method according to claim 1, wherein a plurality of non-combustible material sheets are arranged with a required gap with respect to the combustible material.   Using a sheet having a width larger than the width of the combustible material as the noncombustible material sheet, the noncombustible material sheet with respect to the combustible material so that the side edges of the combustible material are covered with the noncombustible material sheet. The fire spread prevention method according to claim 1, wherein the fire spread prevention method is arranged.   4. The method according to claim 1, further comprising a step of fixing a side edge portion of the non-combustible material sheet with an appropriate fixture after the non-combustible material sheet is arranged on the combustible material. The method for preventing fire spread as described in the item.   As a non-combustible material sheet to be disposed, when a weight is provided at an appropriate position and the combustible material is in a state of being disposed on the combustible material, a tension in a direction in which the non-combustible material sheet is in close contact with the combustible material is generated by the action of the weight. The method for preventing the spread of fire according to any one of claims 1 to 4, wherein a sheet made of incombustible material is used.   The combustible material is a curing sheet used for curing concrete placed on site, and the non-combustible material sheet is disposed on the front surface of the curing sheet. 2. A method for preventing the spread of fire.   A non-combustible material sheet comprising at least a non-combustible material sheet body and weights provided near both ends of the sheet body in the width direction.

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