JP2016017271A - Fire prevention measure structure and fire prevention measure unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a through-hole fire prevention measure structure capable of easily securing necessary fireproof performance without use of a high-performance thermal expansion material.SOLUTION: A fire prevention measure structure is provided on the side of an outer surface 3a of a division body 3 corresponding to a gap G between a through-hole 3H of the division body 3 and a long body 4 inserted therethrough. A thermal expansion material 6 is arranged around the long body 4. A thermosetting material 7 is arranged around the thermal expansion material 6. An annular holding frame 20 arranged in the state of covering at least the periphery of the thermosetting material 7 is fixed to the outer surface 3a of the division body 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fire protection structure and a fire protection unit provided on the outer surface side of a partition corresponding to a gap between a through hole formed in a partition of a building and a long body inserted through the through hole. .

  Generally, the internal space of a building is partitioned into a plurality of room spaces by partitions such as walls, floors, and ceilings. When a fire occurs in a certain room space, a fireproof compartment may be used to prevent the fire from spreading to another room space. In this case, when a long body such as a pipe or a cable is inserted into the through hole formed in the partition body, there is a possibility that a flame may spread through the gap between the through hole and the long body. Therefore, it is necessary to take fire prevention measures for this through hole. As a fire prevention method for a through hole, a method of loading fire prevention material into the gap between the through hole and the long body, or an outer surface of a partition corresponding to the gap between the through hole and the long body There is known a method of disposing a fire protection material on the side using an annular holding frame. In addition, as a fire prevention material, it is common to use the thing containing the thermal expansion material which a volume expands by heating.

  Of the two methods described above, the method of disposing the fire protection material on the outer surface side of the compartment using the annular holding frame is not limited to the thickness of the compartment, the size of the gap, the construction location, etc. It is attracting attention as a versatile method because it is easy to ensure fireproof performance appropriately. An example of such a fire prevention structure by the external arrangement method is disclosed in FIG. 4 and FIG. 6 of Japanese Patent Application Laid-Open No. 2009-243105 (Patent Document 1). In the fire protection structure of Patent Document 1, a fire protection material including a thermal expansion material and an incombustible material is held by an annular holding frame in a state of being wound around a long body. Since the fire prevention material further includes a non-combustible material in addition to the thermal expansion material, it is possible to suppress a reduction in the density of the fire protection part as a whole, and to suppress a reduction in fire prevention performance before and after the fire. It has become.

  However, in the fire protection structure of Patent Document 1, inorganic fibers such as rock wool are used as the non-combustible material disposed so as to face the annular holding frame. Since inorganic fibers have flexibility and cushioning properties, they are crushed to some extent when an external force is applied. For this reason, in order to sufficiently close the gap between the through hole and the elongated body even in the event of a fire, it is necessary to use a thermal expansion material having a high thermal expansion ratio to some extent, and there is still room for improvement in this respect. It had been.

JP 2009-243105 A

  Therefore, the necessary fireproof performance can be easily ensured without using a high-performance thermal expansion material as the thermal expansion material that is placed around the portion of the long body that is inserted through the through hole and exposed on the outer surface side of the partition. Realization of a fire prevention structure that can be performed is desired. Also, it is desired to realize a fire prevention unit that can easily and appropriately realize such a fire prevention structure.

The fire protection structure according to the present invention is:
A fire protection structure provided on the outer surface side of the partition corresponding to a gap between a through-hole formed in a partition of a building and a long body inserted through the through-hole,
A thermal expansion material whose volume is increased by heating is disposed around a portion exposed on the outer surface side of the partition in the long body,
A thermosetting material that is cured by heating is disposed around the thermal expansion material,
An annular holding frame disposed so as to cover at least the periphery of the thermosetting material is fixed to the outer surface of the partition.

According to this structure, in the part exposed in the outer surface side of the division body in the elongate body penetrated by the through-hole, the thermal expansion material, the thermosetting material, and the annular holding frame are provided from the radially inner side around the elongate body. Are arranged in the order of description, and the annular holding frame is fixed to the outer surface of the partition. In the event of a fire, the ambient temperature becomes high due to the heat of the flame, whereby the thermosetting material disposed inside the annular holding frame is heated and cured. For this reason, even if it is heated by the heat of the flame and the thermal expansion material expands, the thermosetting material (cured thermosetting material) is hardly crushed in the radial direction by the force to expand. Since the expansion direction of the thermal expansion material during heating is limited to the longitudinal direction of the elongated body, the thermal expansion of the thermal expansion material is necessary to sufficiently close the gap between the through hole and the elongated body even in a fire. The magnification can be kept small.
Therefore, it is possible to realize a fire prevention structure that can easily ensure necessary fire prevention performance without using a high-performance thermal expansion material having a high thermal expansion ratio.

  Hereinafter, the suitable aspect of the fire-protection structure which concerns on this invention is demonstrated. However, the scope of the present invention is not limited by the preferred embodiments described below.

  As one aspect, the annular holding frame is formed to protrude inward in the radial direction from a peripheral wall portion that covers the periphery of the thermosetting material, and an end portion of the peripheral wall portion opposite to the partitioning body. An end wall part that at least partially covers the outer surface side of at least one of the material and the thermal expansion material, and a holding piece extending from the end wall part toward the partition body side, the thermosetting material, It is preferable that the annular holding frame holds the peripheral wall portion and the holding piece supported at least in the radial direction.

  According to this configuration, the holding piece is further provided on the annular holding frame having the peripheral wall portion and the end wall portion, and the thermosetting material is supported in the radial direction by the peripheral wall portion and the holding piece, so that the inside of the annular holding frame is provided. The thermosetting material can be held with high certainty. For this reason, since the unit can be arrange | positioned around a elongate body and a thermal expansion material in the state which hold | maintained the thermosetting material in the annular holding frame previously, workability | operativity can be improved. In addition, since the holding piece is formed to extend from the end wall portion, for example, when the annular holding frame is integrally formed by punching a metal plate or the like, the yield can be improved, and the cost can be reduced. Can be achieved.

  As one aspect, the annular holding frame includes a peripheral wall portion that covers the periphery of the thermosetting material, and a plurality of fixing portions that are formed at predetermined intervals in the circumferential direction on a base end portion of the peripheral wall portion on the partition body side, And the auxiliary fixing piece is formed in a bent plate shape with a slit hole formed at a circumferential position different from the fixing part of the peripheral end portion of the peripheral wall portion on the partition body side. In the state where the bent end portion is inserted into the thermosetting material side from the slit hole, the annular holding frame is formed by the fastening member inserted through the insertion holes of the fixing portion and the auxiliary fixing piece. It is preferable to be fixed to the outer surface.

  According to this configuration, not only the fixing portion provided in the annular holding frame but also the bent plate-like auxiliary fixing piece inserted into the slit hole of the peripheral wall portion and locked to the annular holding frame is used. The annular holding frame that covers the thermal expansion material and the thermosetting material can be firmly fixed to the outer surface of the partition. Since the thermosetting material is in an uncured state at the time of construction, the bent end portion of the auxiliary fixing piece can be appropriately inserted from the slit hole of the peripheral wall portion toward the thermosetting material side. Further, when the fire occurs, the thermosetting material is cured, and the bent end portion of the auxiliary fixing piece is firmly held between the peripheral wall portion of the annular holding frame and the cured thermosetting material. It is easy to keep the holding frame fixed properly. Therefore, the annular holding frame can be firmly fixed to the outer surface of the partition regardless of the presence or absence of a fire, and the fireproof performance can be maintained high.

The fire protection unit according to the present invention is:
A fire protection unit provided on the outer surface side of the partition corresponding to a gap between a through hole formed in a partition of a building and a long body inserted through the through hole,
A peripheral wall portion concentrically arranged around the thermal expansion material surrounding the elongated body at a predetermined interval, and a radially inwardly projecting form from an end portion of the peripheral wall portion opposite to the partition body. An annular holding frame fixed to the outer surface of the partition body, and an end wall portion and a holding piece extending from the end wall portion toward the partition body side,
A thermosetting material that is held by the annular holding frame in a state of being supported at least in the radial direction by the peripheral wall portion and the holding piece;
Is provided.

According to this configuration, the holding piece is further provided on the annular holding frame having the peripheral wall portion and the end wall portion, and the thermosetting material is supported in the radial direction by the peripheral wall portion and the holding piece, so that the inside of the annular holding frame is provided. The thermosetting material can be held with high certainty. And by arranging the fire protection unit in a state where the thermosetting material is held in the annular holding frame in advance around the thermal expansion material surrounding the long body, the workability during construction of the fire protection structure is improved. Can do. In addition, since the holding piece is formed to extend from the end wall portion, for example, when the annular holding frame is integrally formed by punching a metal plate or the like, the yield can be improved and the cost can be reduced. Can be achieved.
After construction, in the portion exposed to the outer surface side of the partition in the long body inserted through the through hole, the thermal expansion material, the thermosetting material, and the annular holding frame are described from the radially inner side around the long body. The annular holding frame is fixed to the outer surface of the partition body. In the event of a fire, the ambient temperature becomes high due to the heat of the flame, whereby the thermosetting material disposed inside the annular holding frame is heated and cured. For this reason, even if it is heated by the heat of the flame and the thermal expansion material expands, the thermosetting material (cured thermosetting material) is hardly crushed in the radial direction by the force to expand. Since the expansion direction of the thermal expansion material during heating is limited to the longitudinal direction of the elongated body, the thermal expansion of the thermal expansion material is necessary to sufficiently close the gap between the through hole and the elongated body even in a fire. The magnification can be kept small.
Therefore, it is possible to realize a fire prevention unit that can easily and appropriately realize a fire prevention structure that can easily ensure necessary fire prevention performance without using a high-performance thermal expansion material having a high thermal expansion ratio.

A perspective view of a fire protection structure according to an embodiment Cross section of fire protection structure Perspective view of annular holding frame Perspective view from the back side of the fire protection unit Diagram showing one aspect of construction method for fire protection structure Diagram showing one aspect of construction method for fire protection structure Diagram showing one aspect of construction method for fire protection structure Cross-sectional view showing the fire protection structure during fire The perspective view which shows another aspect of the production method of an annular holding frame

  DESCRIPTION OF EMBODIMENTS Embodiments of a fire protection structure and a fire protection unit according to the present invention will be described with reference to the drawings. As shown in FIG.1 and FIG.2, the fire protection unit 1 which concerns on this embodiment is between the through-hole 3H formed in the partition 3 of a building, and the elongate body 4 penetrated by the through-hole 3H. It is a unit for a through-hole fire prevention measure provided on the outer surface 3a side of the partition 3 corresponding to the gap G. In addition, the fire protection structure according to the present embodiment is a through-hole fire protection structure realized using such a fire protection unit 1.

  The fire protection structure according to this embodiment is characterized by the following points. That is, the thermal expansion material 6 is disposed around the portion of the long body 4 exposed to the outer surface 3a side of the partition body 3, the thermosetting material 7 is disposed around the thermal expansion material 6, and at least the thermosetting material 7 is disposed. An annular holding frame 20 arranged so as to cover the periphery of the partition 3 is fixed to the outer surface 3 a of the partition 3. Thereby, it is possible to easily ensure the fireproof performance necessary for the gap G between the through hole 3H of the partition 3 and the long body 4 without using the high-performance thermal expansion material 6. . Hereinafter, the fire protection structure and the fire protection unit 1 according to the present embodiment will be described in detail.

  In the following description, the longitudinal direction of the long body 4 is defined as the “axial direction” with respect to the respective directions of the long body 4 and the annular holding frame 20 arranged coaxially, and the longitudinal direction of the long body 4 The direction orthogonal to the “radial direction” is defined, and the direction of circling around the elongated body 4 is defined as the “circumferential direction”. Reference to the direction in the description of each part of the annular holding frame 20 intends the direction in a state where the annular holding frame 20 is fixed to the partition body 3. In the drawings referred to in the following description, the scale, the vertical / left / right dimensional ratio, and the like may be different from those of an actual product from the viewpoints of easy illustration and easy understanding.

  The partition 3 to which the fire-protection structure is applied is a fire-proof structure that partitions a space in a building into a plurality of room spaces. For example, the partition 3 may be a floor (or a ceiling) that partitions a plurality of room spaces in the vertical direction (see FIG. 2), or may be a wall that partitions the plurality of room spaces in the horizontal direction. Good (not shown). Moreover, as the division body 3, a reinforced concrete structure (RC), a lightweight cellular concrete structure (ALC), a hollow wall (a gypsum board etc. are included) etc. can be illustrated, for example. Of course, what has a structure other than these may be used as the partition 3.

  As shown in FIGS. 1 and 2, the partition body 3 is formed with a through hole 3 </ b> H that penetrates the partition body 3 in the thickness direction (vertical direction in the illustrated example). In the present embodiment, a circular through hole 3H is formed. However, the specific shape of the through hole 3H is not limited to such a configuration, and may be various shapes such as an elliptical shape, a race track shape, and a polygonal shape. In addition, a cylindrical (in this example, a cylindrical shape corresponding to the shape of the through hole 3H) sleeve member (not shown) may be disposed in the through hole 3H.

  The elongated body 4 is inserted into the through hole 3H of the partition body 3. The long body 4 has a long structure extending in one direction, such as a linear body, a tubular body, and a strip-shaped body. As such an elongate body 4, the refrigerant | coolant piping for air conditioners can be illustrated, for example. In the present embodiment, the elongated body 4 includes a piping member 4A for circulating the refrigerant and a covering material 4B that covers the periphery of the piping member 4A. The piping member 4A is a metallic tubular member, for example, and the covering material 4B is a heat insulating material made of, for example, synthetic resin, which is sheathed on the piping member 4A. As described above, the “long body 4” is a concept including not only a tubular member itself functioning as a main body for piping but also a composite body in which such a tubular member and a predetermined functional layer are combined. In addition, the elongate body 4 is not limited to the refrigerant | coolant piping for air conditioners, For example, piping for water supply / drainage, an electric cable, etc. may be sufficient.

  As shown in FIGS. 1 and 2, a thermal expansion material 6 is disposed around a portion of the long body 4 exposed to the outer surface 3 a side of the partition body 3 so as to be in contact with the long body 4. The thermal expansion material 6 is a member having a thermal expansion property (property that increases in volume by heating). For example, a putty-like member (thermal expansion putty material) can be used. Moreover, in this embodiment, the thermal expansion material 6 has flexibility (a property capable of bending) and fire resistance (a property that can easily withstand heat, a property that has a high melting temperature and is difficult to burn) in addition to thermal expansion. It has further. The thermal expansion material 6 includes a resin component having flexibility and fire resistance and a thermal expansion filler kneaded in the resin component. Various known materials can be used as the thermal expansion material 6.

  The composition constituting the thermal expansion material 6 may be coated with a covering member (first covering member). The covering member is formed in a bag shape or a cylindrical shape, for example. Such a covering member is composed of, for example, a resin film, a metal thin film, organic fibers, inorganic fibers, or the like. In the present embodiment, when the covering member is provided, the “thermal expansion material 6” is configured to include the composition and the covering member.

  As shown in FIG. 2, a thermosetting material 7 is disposed around the thermal expansion material 6 so as to be in contact with the thermal expansion material 6. The thermosetting material 7 is a member having thermosetting properties (properties that are cured by heating), and for example, a putty-like member (thermosetting putty material) can be used. Moreover, in this embodiment, the thermosetting material 7 has flexibility in addition to thermosetting, fire resistance, and uncured. For example, the thermosetting material 7 includes a resin component having flexibility, thermosetting property, and fire resistance, and an inorganic filler kneaded in the resin component. As the thermosetting resin component constituting the thermosetting material 7, various thermosetting resins can be used. Various inorganic fillers can be used as the inorganic filler constituting the thermosetting material 7.

  The composition constituting the thermosetting material 7 may be coated with a covering member (second covering member). The covering member is formed in a bag shape or a cylindrical shape, for example. Such a covering member is composed of, for example, a resin film, a metal thin film, organic fibers, inorganic fibers, or the like. In the present embodiment, when the covering member is provided, the “thermosetting material 7” is configured to include the composition and the covering member.

  The thermosetting rate of the thermosetting material 7 is preferably faster than the thermal expansion rate of the thermally expanding material 6. In other words, in the event of a fire, it is preferable that the time required for the thermosetting material 7 to be sufficiently thermoset is shorter than the time required for the thermal expansion material 6 to be sufficiently thermally expanded. In this way, when the ambient temperature rises to, for example, 100 to 250 ° C. in the event of a fire, the thermosetting material 7 is thermoset before the thermal expansion material 6 is thermally expanded. The specific composition ratio (blending ratio) of each of the thermal expansion material 6 and the thermosetting material 7 may be determined so that the relationship between the thermal curing rate and the thermal expansion rate satisfies the above relationship.

  As shown in FIG. 2, an annular holding frame 20 is disposed around the thermosetting material 7 so as to cover at least the thermosetting material 7. The annular holding frame 20 is fixed to the outer surface 3 a of the partition body 3. In the fire protection structure according to the present embodiment, in the portion exposed to the outer surface 3a side of the partition body 3 in the long body 4 inserted through the through hole 3H, the long body 4, the thermal expansion material 6, the thermosetting material 7, And the annular holding frame 20 is arranged in the order described in the radial direction, and the annular holding frame 20 is fixed to the outer surface 3 a of the partition 3. The annular holding frame 20 is configured using a metal material made of iron, stainless steel, steel, copper or the like.

  As shown in FIG. 3, the annular holding frame 20 includes a plurality (two in this example) of divided frame bodies 21 having the same shape that are substantially equally divided in the circumferential direction. The annular holding frame 20 is formed by combining the plurality of divided frame bodies 21. In the present embodiment, one end of each of the pair of divided frame bodies 21 constituting the annular holding frame 20 is hinged. The annular holding frame 20 has an opening posture in which the other end portions of the divided frame bodies 21 are spaced apart from each other with a hinge portion as a base point, and a closed posture in which the other end portions of the divided frame bodies 21 overlap with each other. The posture can be changed freely.

  The annular holding frame 20 (each of the divided frame bodies 21) includes a peripheral wall portion 22, a fixing portion 23, and an end wall portion 24. These are integrally formed. The peripheral wall portion 22 is a wall portion that covers the periphery of the thermosetting material 7 and is formed in a substantially semicylindrical shape. Further, as shown in FIG. 2, the peripheral wall portion 22 is formed so as to have a curved outer peripheral surface that gradually decreases in diameter as it moves away from the outer surface 3 a of the partition body 3 in the longitudinal sectional shape. The end wall portion 24 is a wall portion that protrudes inward in the radial direction from an end portion of the peripheral wall portion 22 opposite to the partition body 3 and is formed in a substantially semicircular shape. In this embodiment, the end wall part 24 is provided so that the outer surface side (opposite side to the outer surface 3a of the division body 3) of the radial direction outer side part in the thermal expansion material 6 may be covered.

  The fixing part 23 is a part for fixing the annular holding frame 20 to the partition body 3 provided at the base end portion on the partition body 3 side in the peripheral wall part 22. As shown in FIG. 3, the fixing portion 23 is formed to protrude in the circumferential direction at both end portions of the peripheral wall portion 22 of each divided frame body 21. In this embodiment, the peripheral wall part 22 has the recessed part 22a formed so that it may dent in the radial direction compared with the other site | part of the said peripheral wall part 22 in the both ends, In this recessed part 22a The fixed portion 23 is configured by a perforated plate-like portion provided at the base end portion on the partition 3 side. The annular holding frame 20 is fixed to the partition body 3 by a fastening member 36 such as a screw inserted in a state where the insertion holes 23a of the fixing portions 23 of the adjacent divided frame bodies 21 overlap with each other (see FIG. 1). reference).

  When the entire annular holding frame 20 is viewed, a plurality (two in this example) of fixing portions 23 are provided substantially equally in the circumferential direction at predetermined intervals (see FIG. 4). A connecting member such as an eyelet is provided in the insertion hole 23a in one of the fixing portions 23 over the pair of divided frame bodies 21, and this portion functions as the hinge portion described above (see FIG. 3).

  In the present embodiment, the annular holding frame 20 (each of the divided frame bodies 21) further includes a holding piece 26. The holding piece 26 is a plate piece extending from the end wall portion 24 toward the partition body 3 side. In the present embodiment, a plurality of (three in this example) holding pieces 26 are provided in each of the divided frame bodies 21. As shown in FIG. 4, one holding piece 26 is provided in the vicinity of both end portions in the circumferential direction of the peripheral wall portion 22 in each divided frame body 21 (a position avoiding the fixing portion 23), and the periphery of the peripheral wall portion 22. One holding piece 26 is provided at the center in the direction. However, without being limited to such a configuration, the number and the formation position of the holding pieces 26 may be appropriately set according to the required holding performance and the like.

  In the present embodiment, the holding piece 26 is bent at a plurality of locations (two locations in this example). As shown in FIG. 2, the holding piece 26 includes a first side part 26a, a second side part 26b bent with respect to the first side part 26a, and a first side part 26a with respect to the second side part 26b. And a third side portion 26c bent in the opposite direction. The holding piece 26 is fixed to the inner side surface (the surface on the outer surface 3a side of the partition body 3) of the end wall portion 24 at the first side portion 26a. The second side part 26b is provided so as to extend from the radially outer end of the first side part 26a toward the partition 3 along the axial direction. The third side 26c is provided so as to extend radially outward from the end of the second side 26b on the side of the partition 3. An end portion on the radially outer side of the third side portion 26c is an open end, and is kept in an unfixed state with respect to other portions of the annular holding frame 20 (particularly, the peripheral wall portion 22).

  The internal space of the annular holding frame 20 (the space defined between the partition 3 and the annular holding frame 20) is roughly divided into two regions arranged concentrically by the second side portion 26b of the holding piece 26. It is done. Of these two regions, the radially inner region (first region) is a thermal expansion material placement region where the thermal expansion material 6 is placed, and the radially outer region (second region) is placed with the thermosetting material 7. It becomes a thermosetting material arrangement area.

  In the present embodiment, as shown in FIG. 4 and the like, the thermosetting material 7 is held by an annular holding frame 20. Further, the thermosetting material 7 is held by the annular holding frame 20 in a state of being supported at least in the radial direction by the peripheral wall portion 22 and the holding piece 26 in the thermosetting material arrangement region. As shown in FIG. 2, in the present embodiment, the thermosetting material 7 is held by the annular holding frame 20 while being supported in the radial direction by the peripheral wall portion 22 and the second side portion 26 b of the holding piece 26. Yes. In addition, the thermosetting material 7 is held by the annular holding frame 20 in a state where the thermosetting material 7 is also supported in the axial direction by the peripheral wall portion 22 and the third side portion 26 c of the holding piece 26. In order to hold the thermosetting material 7 on the annular holding frame 20, the thermosetting material 7 extends in the gap between the peripheral wall portion 22 and the holding piece 26 from the open end side of the third side portion 26 c along the axial direction. Should be inserted. After the thermosetting material 7 is inserted (after holding), the third side portion 26 c also functions as a retainer for the thermosetting material 7. An annular holding frame 20 (fire protection unit 1) holding the thermosetting material 7 is arranged around the thermal expansion material 6 surrounding the long body 4.

  In the present embodiment, as shown in FIG. 3, slit holes 28 are formed at circumferential positions different from the fixing portion 23 at the base end portion on the partition body 3 side in the peripheral wall portion 22. The slit hole 28 is a base end portion of the peripheral wall portion 22 on the partition body 3 side, and is formed at a position slightly separated from the outer surface 3a of the partition body 3 (see FIG. 2). Further, the slit hole 28 is formed in the central portion in the circumferential direction of the peripheral wall portion 22. Looking at the entire annular holding frame 20, a plurality of (two in this example, the same number as the fixing portions 23) slit holes 28 are provided substantially equally in the circumferential direction at predetermined intervals. In this embodiment, the fixing | fixed part 23 and the slit hole 28 are provided substantially equally in the circumferential direction at predetermined intervals so that it may appear alternately in the circumferential direction. In the present embodiment, the slit hole 28 is formed as a long hole whose longitudinal direction is along the circumferential direction. The slit hole 28 is an opening through which the auxiliary fixing piece 30 provided separately from the annular holding frame 20 is partially inserted into the internal space of the annular holding frame 20.

  The auxiliary fixing piece 30 is configured using a metal material made of iron, stainless steel, steel, copper or the like. The auxiliary fixing piece 30 is formed in a bent plate shape having a substantially L shape in a side view (see in the circumferential direction) using a band plate member (see FIG. 7). That is, the auxiliary fixing piece 30 includes a flat plate-like first plate portion 31 and a flat plate-like second plate portion 32 that intersects the first plate portion 31 (substantially orthogonal in this example). An insertion hole 31 a is formed in the central portion of the first plate-like portion 31. Moreover, the notch 31b is formed in the predetermined position (position on the 2nd plate-shaped part 32 side rather than the insertion hole 31a) in the opposite side of the both ends of the 1st plate-shaped part 31, respectively. The second plate portion 32 is smaller than the first plate portion 31. The second plate-like portion 32 can be considered as a portion where the end portion of the first plate-like portion 31 as the main body portion of the auxiliary fixing piece 30 is bent. In the present embodiment, the second plate-like portion 32 corresponds to a “bent end” in the present invention.

  The second plate-like portion 32 of the auxiliary fixing piece 30 is inserted into the internal space of the annular holding frame 20 through the slit hole 28. Although the thermosetting material 7 is held on the annular holding frame 20, the thermosetting material 7 is in an uncured state at the time of construction, and therefore the insertion of the auxiliary fixing piece 30 through the slit hole 28 is hindered. It will never be done. After insertion, the second plate-like portion 32 is sandwiched in the radial direction between the peripheral wall portion 22 and the thermosetting material 7, and the first plate-like portion 31 protrudes radially outward from the peripheral wall portion 22. Then, the posture adjustment of the auxiliary fixing piece 30 is performed.

  In this state, when a fastening member 36 such as a screw inserted into the insertion hole 31a is screwed into the outer surface 3a of the partition 3, the annular holding frame that is engaged with the second plate-like portion 32 of the auxiliary fixing piece 30 20 is also indirectly fixed to the outer surface 3 a of the partition 3. Thus, in the present embodiment, the annular holding frame 20 is fixed to the outer surface 3a of the partition body 3 by the fastening members 36 inserted through the insertion holes 23a and 31a of the fixing portion 23 and the auxiliary fixing piece 30, respectively. Yes. That is, not only the fixing portion 23 provided in the annular holding frame 20 from the beginning, but also the bent plate-like shape in which the second plate-like portion 32 is inserted into the slit hole 28 of the peripheral wall portion 22 and locked to the annular holding frame 20. The annular holding frame 20 is fixed also using the auxiliary fixing piece 30. Thereby, the annular holding frame 20 that covers the thermal expansion material 6 and the thermosetting material 7 is firmly fixed to the outer surface 3 a of the partition 3.

  Hereinafter, the construction method of the fire protection structure according to the present embodiment will be described in order. First, as shown in FIG. 5, the through-hole 3H is formed in the division body 3, and the elongate body 4 is inserted in the through-hole 3H. A radial gap G exists between the through hole 3 </ b> H and the elongated body 4.

  Next, as shown in FIG. 6, on the outer surface 3 a side of the partition 3 corresponding to the gap G, the thermal expansion material 6 is disposed around the portion of the long body 4 exposed from the partition 3. The thermal expansion material 6 is disposed so as to surround the outer periphery of the long body 4, and is also disposed in a gap between the adjacent long bodies 4. Thereafter, the fire protection unit 1 including the annular holding frame 20 and the thermosetting material 7 supported by the peripheral wall portion 22 and the holding piece 26 of the annular holding frame 20 is disposed around the thermal expansion material 6. . At that time, the posture of the annular holding frame 20 is changed from the open posture to the closed posture so as to surround the thermal expansion material 6 on the outer surface 3 a of the partition 3.

  Next, as shown in FIG. 7, the fastening member 36 is inserted into the insertion hole 23 a formed in the fixing portion 23 of the annular holding frame 20 in the closed posture, and the fastening member 36 is screwed into the partition body 3. Further, the second plate-like portion 32 of the auxiliary fixing piece 30 is inserted from the outside into the slit hole 28 formed in the peripheral wall portion 22 of the annular holding frame 20 and is formed in the first plate-like portion 31 of the auxiliary fixing piece 30. The fastening member 36 is inserted into the inserted through hole 31 a and the fastening member 36 is screwed into the partition 3. In this way, the annular holding frame 20 is placed on the outer surface 3a of the partition 3 at a plurality of locations in the circumferential direction (in this example, a total of four locations including two locations of the fixing portion 23 and two locations of the auxiliary fixing piece 30). To fix. This completes the construction of the fire protection structure according to the present embodiment.

  By the way, when a fire occurs in a building, the ambient temperature rises due to the heat of the flame, and the thermosetting material 7 starts to cure. Further, the covering material 4B constituting the long body 4 melts and burns (illustration is omitted in FIG. 8). The gap G between the through hole 3H and the elongated body 4 is further expanded by melting and burning the covering material 4B, but the thermal expansion material 6 is expanded so as to compensate for the increase in the gap volume. To start.

  At this time, in the present embodiment, the thermosetting material 7 is thermally cured prior to or in parallel with the thermal expansion of the thermal expansion material 6. For this reason, as shown in FIG. 8, the cured thermosetting material 7 is hardly crushed in the radial direction by the force of the thermal expansion material 6 to expand, and the expansion direction of the thermal expansion material 6 is the axial direction. It is limited to (longitudinal direction of the long body 4). As a result, the thermally expandable thermal expansion material 6 can be efficiently guided to the inside of the through hole 3H, so that it is necessary to sufficiently close the gap G between the through hole 3H and the elongated body 4 in the event of a fire. The thermal expansion magnification of the resulting thermal expansion material 6 can be kept small.

  Further, in the present embodiment, the end wall portion 24 of the annular holding frame 20 is provided so as to cover a part of the outer surface on the radially outer side of the thermal expansion material 6. For this reason, the expansion of the thermal expansion material 6 along the axial direction (longitudinal direction of the long body 4) is partially blocked by the end wall 24, and also from this point, the thermal expansion material 6 that thermally expands efficiently penetrates. It can be guided to the inside of the hole 3H.

  Moreover, in this embodiment, the thermosetting material 7 is hold | maintained at the cyclic | annular holding frame 20 with the holding piece 26, and after the hardening, the surrounding wall part 22, the hardened thermosetting material 7, and the holding piece 26 are united. Thus, it functions as a thick and highly rigid outer peripheral wall (hereinafter referred to as “integrated outer peripheral wall”). For this reason, even if the thermal expansion material 6 expands and the expansion force acts on the inner surface of the integrated outer peripheral wall (mainly the inner surface of the thermosetting material 7), the integrated outer peripheral wall (in particular, the annular holding frame 20 here). Can be prevented from being deformed. Since the integral outer peripheral wall has a certain degree of regularity even when a fire occurs, it is possible to suppress a large stress from acting on the fixing portion 23 and the auxiliary fixing piece 30. Moreover, since the 2nd plate-shaped part 32 is clamped firmly between the hardened | cured thermosetting material 7 and the surrounding wall part 22, the attitude | position of the auxiliary | assistant fixed piece 30 is stabilized. Therefore, the fixing force using the auxiliary fixing piece 30 is sufficiently exhibited. As a result, even when a fire occurs, it is possible to appropriately maintain the fixed state of the annular holding frame 20 covering the thermal expansion material 6 and the thermosetting material 7 to the partition body 3.

  Moreover, in this embodiment, since the thermal expansion material 6 with a small thermal expansion magnification can be used, the density reduction accompanying the thermal expansion at the time of a fire can be suppressed regarding the thermal expansion material 6. Furthermore, in the present embodiment, the thermosetting material 7 that is used together with the thermal expansion material 6 and plays a role such as providing a guide in the thermal expansion direction and imparting rigidity to the integrated outer peripheral wall does not substantially change in volume before and after curing. It is also possible to suppress a reduction in density as a whole of the fire prevention part. Combined with these effects, it is possible to effectively suppress the reduction in the density of the entire fire prevention part. Therefore, according to the fire-protection measure structure according to the present embodiment, it is possible to effectively suppress a decrease in fire-proof performance before and after a fire without using a high-performance thermal expansion material 6 having a high thermal expansion ratio.

[Other Embodiments]
Finally, other embodiments of the fire protection structure and fire protection unit according to the present invention will be described. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises.

(1) In said embodiment, the structure by which the annular holding frame 20 (namely, fire prevention unit 1) of the state which hold | maintained the thermosetting material 7 is arrange | positioned around the thermal expansion material 6 surrounding the elongate body 4. FIG. Described as an example. However, the embodiment of the present invention is not limited to this. For example, the annular holding frame 20 having no holding piece 26 is used, and the thermosetting material 7 and the annular holding frame 20 are not unitized. And the structure which only arrange | positions the cyclic | annular holding frame 20 in order of description may be sufficient. In this case, the thermal expansion material 6 and the thermosetting material 7 are collectively covered with one covering member, the thermal expansion material 6 is located on the long body 4 side, and the thermosetting material 7 is on the annular holding frame 20 side. It may be arranged so as to be located at.

(2) In the above embodiment, an example in which the thermosetting material 7 including a thermosetting resin and an inorganic filler is used has been described. However, the embodiment of the present invention is not limited to this. Any material having other composition can be used as the thermosetting material 7 as long as it is cured when heated.

(3) In the above embodiment, the holding piece 26 is configured as a separate member with respect to the peripheral wall portion 22 and the end wall portion 24 that are integrally formed, and the description is mainly made assuming that these are joined to each other. did. However, the embodiment of the present invention is not limited to this. For example, as can be understood from FIG. 9 showing a stage in the middle of creating the annular holding frame 20, all the parts constituting the annular holding frame 20 may be integrally configured. In FIG. 9, locations corresponding to the respective portions of the annular holding frame 20 after completion are indicated by adding apostrophes (′) to the reference numerals of the respective portions used in the above embodiment as precursor portions of the respective portions. . When the annular holding frame 20 is integrally formed by punching a metal plate as shown in FIG. 9, the holding piece precursor portion 26 ′ is formed by utilizing the central plate portion which is essentially discarded. Since it can be formed, the yield can be improved and the cost can be reduced. In this case, the holding piece 26 can be finally formed by bending the holding piece precursor portion 26 ′ at two locations. As in this case, a configuration in which the holding piece 26 does not have the first side portion 26 a is also possible, and the end wall portion 24 may be configured to cover the outer surface side of the thermosetting material 7.

(4) In the above embodiment, the configuration in which the bent holding piece 26 has the first side portion 26a, the second side portion 26b, and the third side portion 26c has been described as an example. However, the embodiment of the present invention is not limited to this. For example, the holding piece 26 may include only the first side portion 26a and the second side portion 26b without having the third side portion 26c. Further, in the case where the entire annular holding frame 20 is configured integrally, the holding piece 26 may be configured only by the second side portion 26b. In such a case, although it is not expected to surely prevent the thermosetting material 7 from coming off, at least the peripheral wall portion 22 and the holding piece 26 support the thermosetting material 7 in the state of being radially supported. Can be held in.

(5) In the above embodiment, the configuration in which the fixing portion 23 is formed to protrude from the peripheral wall portion 22 in the circumferential direction has been described. However, the embodiment of the present invention is not limited to this. If the annular holding frame 20 can be fixed to the partition 3, the formation mode of the fixing portion 23 can be arbitrarily determined. For example, the fixing portion 23 may be formed to protrude from the peripheral wall portion 22 in the radial direction. In this case, for example, a perforated plate-like fixing piece having a shape similar to that of the auxiliary fixing piece 30 described in the above embodiment and bent so as to exhibit a substantially L shape in a side view is used, and the peripheral wall is used. The fixing portion 23 may be bonded to the outer peripheral surface of the portion 22.

(6) In the above embodiment, the configuration in which the annular holding frame 20 is fixed to the partition body 3 by the two fixing portions 23 and the two auxiliary fixing pieces 30 has been described as an example. However, the embodiment of the present invention is not limited to this. For example, the auxiliary fixing pieces 30 may be provided at three places, four places,..., Or the auxiliary fixing pieces 30 may not be provided at all. Further, depending on the structure of the fixing portion 23, the fixing portion 23 may also be provided at three places, four places,. The number of the fixing portions 23 and the auxiliary fixing pieces 30 is preferably an even number from the viewpoint of symmetry, considering that the annular holding frame 20 includes a pair of divided frame bodies 21. .

(7) In the above embodiment, the configuration in which the pair of divided frame bodies 21 constituting the annular holding frame 20 are hinge-connected has been described as an example. However, the embodiment of the present invention is not limited to this. For example, a pair of divided frame bodies 21 are configured to be detachable at both end portions of each peripheral wall portion 22, and a separation posture in which both divided frame bodies 21 are separated from each other and both end portions of both divided frame bodies 21 are engaged with each other. The closed posture may be configured so that the posture can be freely changed. Further, the annular holding frame 20 may be configured to include three or more divided frame bodies 21.

(8) The construction procedure described in the above embodiment is merely an example, and the embodiment of the present invention is not limited to this. For example, the annular holding frame 20 (that is, the fire protection unit 1) holding the thermosetting material 7 is concentrically arranged at a predetermined interval around the long body 4 and fixed to the partition body 3, and then The thermal expansion material 6 may be disposed between the long body 4 and the thermosetting material 7 so as to surround the outer periphery of the long body 4. For example, when the annular holding frame 20 having no holding piece 26 is used, after the thermal expansion material 6 is arranged around the elongated body 4, the thermosetting material 7 is arranged around the thermal expansion material 6. Thereafter, the annular holding frame 20 may be arranged around the thermosetting material 7 and the annular holding frame 20 may be fixed to the partition body 3.

(9) Regarding other configurations as well, it should be understood that the embodiments disclosed herein are illustrative in all respects and that the scope of the present invention is not limited thereby. Those skilled in the art will readily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Accordingly, other embodiments modified without departing from the spirit of the present invention are naturally included in the scope of the present invention.

  The present invention can be used for, for example, a fire prevention structure and a fire prevention unit applied to a fire prevention section.

DESCRIPTION OF SYMBOLS 1 Fire prevention unit 3 Partition body 3a Outer surface 3H Through-hole 4 Long body 6 Thermal expansion material 7 Thermosetting material 20 Annular holding frame 21 Divided frame body 22 Peripheral wall part 23 Fixing part 23a Insertion hole 24 End wall part 26 Holding piece 28 Slit Hole 30 Auxiliary fixing piece 31 First plate-like portion 31a Insertion hole 32 Second plate-like portion (bent end)
36 Fastening member G Clearance

Claims (4)

A fire protection structure provided on the outer surface side of the partition corresponding to a gap between a through-hole formed in a partition of a building and a long body inserted through the through-hole,
A thermal expansion material whose volume is increased by heating is disposed around a portion exposed on the outer surface side of the partition in the long body,
A thermosetting material that is cured by heating is disposed around the thermal expansion material,
A fire protection structure in which an annular holding frame arranged to cover at least the periphery of the thermosetting material is fixed to the outer surface of the compartment. The annular holding frame is formed to protrude inward in the radial direction from a peripheral wall portion that covers the periphery of the thermosetting material, and an end portion of the peripheral wall portion opposite to the partition, and the thermosetting material and the thermal expansion An end wall portion that at least partially covers at least one outer surface side of the material, and a holding piece extending from the end wall portion toward the partition body,
The fire protection structure according to claim 1, wherein the thermosetting material is held by the annular holding frame in a state of being supported at least in the radial direction by the peripheral wall portion and the holding piece. The annular holding frame has a peripheral wall portion that covers the periphery of the thermosetting material, and a plurality of fixing portions that are formed at predetermined intervals in the circumferential direction on a base end portion of the peripheral wall portion on the partition body side,
A slit hole is formed at a circumferential position different from the fixed portion of the base end portion on the partition body side in the peripheral wall portion,
Using the auxiliary fixing piece formed in a bent plate shape, each of the fixing portion and the auxiliary fixing piece is inserted in a state where the bent end portion of the auxiliary fixing piece is inserted from the slit hole to the thermosetting material side. The fire protection structure according to claim 1 or 2, wherein the annular holding frame is fixed to an outer surface of the partition body by a fastening member inserted through the hole. A fire protection unit provided on the outer surface side of the partition corresponding to a gap between a through hole formed in a partition of a building and a long body inserted through the through hole,
A peripheral wall portion concentrically arranged around the thermal expansion material surrounding the elongated body at a predetermined interval, and a radially inwardly projecting form from an end portion of the peripheral wall portion opposite to the partition body. An annular holding frame fixed to the outer surface of the partition body, and an end wall portion and a holding piece extending from the end wall portion toward the partition body side,
A thermosetting material that is held by the annular holding frame in a state of being supported at least in the radial direction by the peripheral wall portion and the holding piece;
Fire protection unit comprising.

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