Fireproofing material and fireproof structure

Abstract

To provide a fireproofing material and a fireproof structure with excellent workability.SOLUTION: A fireproofing material 1 is a division body W that divides a space, and comprises: a fireproof material support part 2 that is fixed to the outside of the division body W in which a through hole is formed, and provided around an axial extension line of a center of the through hole; and a fireproof material 4 that is in contact with the fireproof material support part 2, and expands in the opposite direction to the fireproof material support part 2 when exposed to heat.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a partition that divides a space, for example, a fireproofing material and a fireproof structure for a partition that has a through hole through which a long object can pass. [Background technology]

[0002] Conventionally, in a wall constituting a fire compartment, which is a partition body, a through hole provided for passing a long object such as a cable or a pipe through the through hole has been provided with a thermally expandable sealant inside the through hole (for example, Patent Document 1). However, since it takes a lot of work to fill a through hole with a sealant, which has a small space, there is room for improvement in terms of workability. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-351305 A Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, an object of the present invention is to provide a fireproofing material and a fireproof structure that are easy to install. [Means for solving the problem]

[0005] The present invention is a fire-resistant measure comprising a partition that divides a space, the partition having a through hole formed therein, a fire-resistant support part that is fixed to the outside of the partition and arranged around the axial extension line of the center of the through hole, and a fire-resistant material that is in contact with the fire-resistant support part and expands in the opposite direction to the fire-resistant support part when exposed to heat.

[0006] The present invention also relates to a fireproof structure comprising a partition that divides a space into multiple sections, a long body that penetrates the partition, a fireproof support portion provided around the position where the long body passes, and a fireproof material that is in contact with the fireproof support portion and expands in the opposite direction to the fireproof support portion when exposed to heat.

[0007] According to these configurations, by providing a combination of the fireproof material support portion and the fireproof material, the fireproof material that acts on the through hole can be arranged by fixing the fireproof material support portion to the outside of the partition body.

[0008] The fireproof material may be provided radially outside the fireproof material support portion and configured to expand radially outwardly of the fireproof material support portion upon receiving heat.

[0009] According to this configuration, the fire-resistant material expanded in the radially outward direction of the fire-resistant material support portion can prevent heat from passing through the through hole in the event of a fire.

[0010] The fireproof material support portion may also be configured to have a retaining through-hole, and the fireproof material may be disposed in the space defined by the retaining through-hole, thereby allowing the fireproof material support portion to retain the fireproof material.

[0011] According to this configuration, the fireproof material is reliably held by the fireproof material support portion through the holding through-hole.

[0012] The refractory support portion may be made of a deformable material and may be configured to be composed of a plurality of divided pieces separated in the circumferential direction.

[0013] According to this configuration, the refractory material support portion can be easily deformed by deforming each of the plurality of divided pieces.

[0014] Also, at least some of the plurality of split pieces may be configured to have a plastically deformable additional portion on the end side farther from the partition body in the fixed state.

[0015] According to this configuration, the additional portion can be wound around a long body, such as an electric wire passing through the through hole, so that the fireproof material can be tightly attached to the long body.

[0016] In addition, engaging pieces may be provided on at least some of the multiple segments, and the engaging pieces may be configured to maintain the multiple segments in a close relationship by engaging with themselves or with the other engaging pieces when multiple engaging pieces are provided.

[0017] According to this configuration, the state of the multiple split pieces can be easily maintained by the engaging pieces. Effect of the Invention

[0018] According to the present invention, if the fireproof material support portion is fixed to the outside of the partition body, the fireproof material acting on the through hole can be disposed, thereby improving workability. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view showing a single fireproofing material according to a first embodiment of the present invention prior to installation. [Diagram 2] FIG. 1 shows divided pieces of a fireproof support portion of the fireproofing material of the first embodiment, one of which is shown without fireproofing material and the adjacent one is shown with fireproofing material attached. [Diagram 3] FIG. 11 is a perspective view showing a single fireproofing material according to a second embodiment of the present invention prior to application. [Figure 4] FIG. 11 is a perspective view showing a single fireproofing material according to a third embodiment of the present invention before installation. [Diagram 5] FIG. 11 is a perspective view showing the fireproofing material of the third embodiment with the fireproofing material removed. [Figure 6] FIG. 11 is a perspective view showing a single fireproofing material according to a fourth embodiment of the present invention before installation. [Figure 7] FIG. 11 is a perspective view showing a fireproofing material according to a third embodiment of the present invention in a state during construction (attached to a partition body). [Figure 8] FIG. 11 is a perspective view showing a state during construction (a state in which a fireproofing material support portion has been deformed so as to be squeezed) of the fireproofing material of the third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Next, the present invention will be described with reference to first to fourth embodiments. Note that each embodiment is merely an example, and the present invention can be modified and embodied in various forms.

[0021] First, the partition W to which the fireproofing material 1 of each embodiment is placed to construct the fireproof structure C will be described. As shown in Fig. 7 and Fig. 8 (which relate to the third embodiment), the partition W is a plate-like object with a surface dimension larger than a thickness dimension, which is provided to partition the space inside a building into a plurality of spaces, and corresponds to, for example, a wall or a floor. In the case of a wall, the space inside the building is partitioned into two spaces, the front side and the back side of the wall. In Fig. 7 and the like, the wall as the partition W is drawn as a solid object, but it may be a hollow object composed of, for example, two parallel plate-like bodies. In the partition W, the surface facing the partitioned space is defined as the surface W1. This partition W has a through hole (hidden by the fireproofing material 1 in the drawing, and the shape is not shown) that penetrates in the thickness direction. The through hole to which the fireproofing material 1 of each embodiment is applied is assumed to be a round hole with a circular cross-sectional shape. However, the shape of the through hole is not limited to this, and it may be a polygonal hole. A long body L passes through this through hole from one space (e.g., the front side) to the other space (e.g., the back side) separated by the partition W. The long body L is an object whose longitudinal dimension is greater than its radial dimension and which can pass fluid, power, and electrical signals between the one space and the other space, such as a pipe or electric wire. Multiple long bodies L can be passed through one through hole (three are shown in Figure 7, etc.). In this case, the multiple long bodies L can be bundled together using a binder or the like.

[0022] Next, the fireproofing material 1 will be described. FIG. 1 shows the fireproofing material 1 of the first embodiment. The fireproofing material 1 includes a fireproofing support part 2, a partition body mounting part 3, and a fireproofing material 4. The fireproofing material 1 has a cylindrical appearance with a flange at the base. In the following, the "radial direction" and "circumferential direction" of the cylindrical shape are used to describe the directions of the fireproofing material 1. The imaginary axial direction passing through the center of the cylindrical shape is referred to as the "axial direction". With regard to the "circumferential direction", since the divided pieces 21 described later are flat, there is a slight deviation in the direction from the strict circumferential direction, which is the curvature direction, except for the fourth embodiment. However, for the sake of convenience, this directional expression will be used. In addition, in the axial direction of the fireproofing material 1, the side closer to the partition body W when installed is referred to as the "base end side" or "rear", and the far side is referred to as the "tip side" or "front".

[0023] The fireproof material support part 2 is a part fixed to the outside of the partition body W (the front side of the partition body W). In this embodiment, as shown in Figs. 7 and 8, for example, it is fixed to the surface W1 of the wall as the partition body W via the partition body mounting part 3 described later. The fixing can be performed, for example, by screwing to the partition body mounting part 3. It may also be fixed by staples embedded in the partition body W using a tacker. In addition, in the case where a part of the fireproof material 4 is provided so as to wrap around the inner peripheral edge part of the partition body mounting part 3 and the fireproof material 4 has adhesiveness, it is also possible to fix the partition body mounting part 3 to the surface W1 of the wall by utilizing the adhesive force of the fireproof material 4. It is also possible to use the adhesive force of the fireproof material 4 for temporary fixing.

[0024] The fireproof material support part 2 is provided around the axial extension line of the center of the through hole penetrating the partition body W while being fixed to the partition body W. In normal cases, the long body L is arranged so as to coincide with the axial extension line. The fireproof material support part 2 is formed from a deformable material. Specifically, it is formed from a material capable of plastic deformation. The fireproof material support part 2 in this embodiment is made of a steel plate, and can be bent at the boundary position with the partition body mounting part 3. When bent, the fireproof material support part 2 can cover the through hole.

[0025] The fireproof material support part 2 is composed of a plurality of divided pieces 21-21 separated in the circumferential direction. By deforming each of the plurality of divided pieces 21-21, the fireproof material support part 2 as a whole can be easily deformed. The deformation of each divided piece 21 can be performed by tilting it radially inward (diagonally inward) as shown in FIG. 8. In the first embodiment, eight approximately flat plate-shaped divided pieces 21-21 are provided so as to be aligned in the circumferential direction. Each divided piece 21 is made to have an approximately rectangular flat plate shape. Therefore, the fireproof material support part 2 as a whole has an octagonal tubular shape, and the cross-sectional shape is a regular octagon. The inner diameter of the fireproof material support part 2 (more specifically, the inner diameter including the fireproof material 4 in a state in which the fireproof material 4 is arranged) is set to be larger than the diameter of the through hole in the partition body W. In this way, even if the partition body mounting part 3 is provided, the partition body mounting part 3 is unlikely to block the through hole of the partition body W, and the fireproof performance is excellent. Also, construction is easier when the fireproof material support part 2 is larger than the through hole of the partition body W. When the fireproof material support part 2 is a polygonal cylinder, the relationship with the through hole of the partition body W is evaluated based on the dimension of the minimum inner diameter (when the cross-sectional shape of this embodiment is a regular octagon, the dimension between the opposing sides, not between the opposing vertices).

[0026] In the fireproof material support part 2, the divided pieces 21, 21 adjacent in the circumferential direction are separated by a separation slit 21a. However, the fireproof material 4 may overlap on the radially inner side of the separation slit 21a (when the divided pieces 21, 21 adjacent in the circumferential direction are sequentially folded or when a space for passing the long body L through the separation slit 21a is formed, the part of the fireproof material 4 that was connected in the circumferential direction at the separation slit 21a is separated). Also, the fireproof material 4 may be separated from the beginning at the separation slit 21a. In the fourth embodiment shown in FIG. 6, each divided piece 21 is curved in the circumferential direction, and the fireproof material support part 2 is cylindrical.

[0027] The fireproof material support part 2 has a retaining through hole 211. In this embodiment, the retaining through hole 211 is formed in each divided piece 21. The retaining through hole 211 in the first embodiment is shaped as shown in FIG. 2. Each divided piece 21 is provided with two sets of circumferentially extending inner and outer continuous slits 212 facing each other in the axial direction, and a protruding region 213 between the inner and outer continuous slits 212, 212 facing each other in each set is formed to protrude radially inward from the outer region of each divided piece 21. Each set of the inner and outer continuous slits 212 forms a part having a space in which the radial inside and the radial outside are connected in each divided piece 21. This part is the retaining through hole 211. The fireproof material 4 is arranged in the retaining through hole 211 and the part where the space is connected to the retaining through hole 211, and in the first embodiment, it is in the form shown in the right part of FIG. 2. As shown in FIG. 1, the fireproof material 4 is disposed on the radially inner surface of each divided piece 21 and on the radially outer surface thereof at a position that coincides with the protruding region 213 between the inner and outer continuous slits 212, 212. In the first embodiment, the fireproof material 4 is disposed so as to sandwich the protruding region 213 from the radially inner and outer sides at the holding through-holes 211. Therefore, the fireproof material 4 can be closely attached to each divided piece 21 with a sufficient area at the holding through-holes 211. Since the fireproof material 4 can be securely held by the fireproof material support part 2, even if the fireproof material 4 is plasticized (softened) during a fire, for example, the fireproof material 4 is unlikely to fall off the fireproof material support part 2, and the fireproof material 4 can be reliably expanded starting from the closely attached part.

[0028] Here, the retaining through-hole 211 in another embodiment will be described. Note that parts that are functionally the same even if they have different shapes will be described with the same reference numerals as in the first embodiment. The second embodiment shown in Fig. 3 has the same basic form as the first embodiment, but the retaining through-hole 211 is formed long in a direction perpendicular to the first embodiment, that is, in the axial direction when viewed from the radially outer side. This is because a slit (not shown) is formed in the axial direction.

[0029] In the third embodiment shown in Fig. 4, fireproof material 4 is disposed over the entire radially inner and outer surfaces of each divided piece 21. Fig. 5 shows the fireproofing material 1 of the third embodiment in a state in which the fireproofing material 4 is not attached. The retaining through-holes 211 of the third embodiment are slit-shaped extending in the axial direction and penetrating inside and outside in the radial direction. A plurality of slit-shaped retaining through-holes 211 are formed in each divided piece 21. Seven retaining through-holes 211 are provided at equal intervals in each divided piece 21 of the third embodiment, but the shape and arrangement of the retaining through-holes 211 can be changed in various ways.

[0030] 6 is similar to the third embodiment with regard to the retaining through-holes 211, in which the fireproof material 4 is disposed over the entire radially inner surface of each divided piece 21, and the radially outer surface of each divided piece 21 is exposed at the retaining through-holes 211. Although the retaining through-holes 211 in the fourth embodiment do not reach each divided piece 21, the formation range of the retaining through-holes 211 is not particularly limited.

[0031] Returning to the first embodiment, the explanation will be made. In the first embodiment (similar to the second and third embodiments), at least some of the divided pieces 21-21 have an additional part 22 that is plastically deformable at the axial tip side, that is, at the end side far from the partition body W when the fireproofing material 1 is fixed to the partition body W. In the first embodiment, all of the divided pieces 21-21 have the additional part 22, but the additional part 22 may be provided only on some of the divided pieces 21. The additional part 22 has a circumferentially elongated shape, and the plate thickness and circumferential dimension are the same as those of the divided pieces 21. The circumferential dimension may be smaller than that of the divided pieces 21. The additional part 22 is integrally connected to each divided piece 21 at the circumferential center, and is separated from each divided piece 21 at both circumferential ends. The connection points of the additional part 22 to each divided piece 21 may be at other positions. At the axial center of each additional part 22, a horizontal slit 221 extending in the circumferential direction is formed. The horizontal slits 221 have the same function of holding the fireproof material 4 as the holding through holes 211 of the divided pieces 21, and also reduce the rigidity of the additional portion 22, making it easier to bend, particularly in the circumferential direction. The fireproof material 4 is disposed on the radially inner side of the additional portion 22. The fireproof material 4 is provided continuously from the divided pieces 21 to the additional portion 22. The additional portion 22 can be deformed, for example, into a U-shape, and the additional portion 22 can be wrapped around or aligned along the elongated body L, for example. This allows the fireproof material 4 to be brought into close contact with the elongated body L.

[0032] At least some of the divided pieces 21 are provided with the engagement piece 23. In the first embodiment (similar to the second and third embodiments), the engagement piece 23 is integrally connected to the axial tip side of the additional part 22 in two divided pieces 21 facing each other in the radial direction. That is, the engagement piece 23 in the first embodiment is provided so that the additional part 22 is interposed between the divided pieces 21. However, as described above, in the divided pieces 21 in which the additional part 22 is not provided, the engagement piece 23 is provided directly on the divided pieces 21. The engagement piece 23 constitutes a part of the fireproof material support part 2, but the fireproof material 4 is not attached due to the function described later. The engagement piece 23 is a strip-shaped part extending along the width direction (circumferential direction) of the divided pieces 21. As shown in FIG. 1, the engagement piece 23 is formed such that one side in the longitudinal direction of the engagement piece 23 is a long part 231 having a large longitudinal dimension, and the other side is a short part 232, based on the connection point with the additional part 22 (or the divided pieces 21). Moreover, the pair of engaging pieces 23, 23 are parallel to each other before they are engaged. In the pair of engaging pieces 23, 23, the short portion 232 faces the long portion 231. The reason for this is that when engaging the pair of engaging pieces 23, 23 as shown in Fig. 8, if one of them (the long portion 231) is longer, the degree of freedom of engagement increases accordingly.

[0033] The engagement piece 23 has a plurality of engagement slits 233 formed at both ends in the width direction. The engagement slits 233 are provided at regular intervals on one end edge in the width direction from the connection to the divided piece 21 to the longitudinal end. They are also provided at regular intervals on the other end edge in the width direction from the connection to the divided piece 21 to the longitudinal end. The engagement slits 233 on one end edge in the width direction and the engagement slits 233 on the other end edge are alternately formed in the longitudinal direction. The pair of engagement pieces 23, 23 thus formed can be appropriately bent as shown in FIG. 8 to sandwich the elongated body L between the engagement slits 233 of one engagement piece 23 and the engagement slits 233 of the other engagement piece 23, so that the divided piece 21 can be kept bent with respect to the elongated body L. In this way, the engaging piece 23 holds the multiple divided pieces 21-21 in close proximity by engaging with itself, or with another engaging piece 23 when multiple engaging pieces 23 are provided. Since the engaging piece 23 is made of steel plate, it will not burn even in the event of a fire, and the state of the multiple divided pieces 21-21 can be continued to be held.

[0034] However, in the fourth embodiment shown in Fig. 6, the divided pieces 21 are not provided with the additional portion 22 and the engagement piece 23. Instead of providing the additional portion 22 and the engagement piece 23, in the fourth embodiment, the plate thickness is set to a degree that allows plastic deformation when subjected to an external force while retaining shape, so that each divided piece 21 can be deformed to be curved in the circumferential direction and the axial direction in addition to being tilted. Deformation can be performed not only at the ends in the axial direction, but also in the middle part by squeezing. With this configuration, even if the additional portion 22 and the engagement piece 23 are not provided, each divided piece 21 and the fireproof material 4 can be easily attached to the long body L.

[0035] The fireproof material support part 2 in each embodiment is configured to be deformable at least in the radial direction. Here, the cross-sectional area of ​​the long body L in the cross-sectional area of ​​the through hole may be small (small area / few pieces, etc.) or large (large area / many pieces, etc.). Even if the shape of the long body L is different, the fireproof material support part 2 can easily follow the outer circumferential position of the long body L. Therefore, it is easy to use.

[0036] The partition mounting part 3 is made of a steel plate like the fireproofing support part 2, and in this embodiment, it is a substantially square flat plate with rounded corners. A fixing hole 31 penetrates the corner of the partition mounting part 3. A screw S for fixing the fireproofing material 1 to the surface W1 of the partition W is inserted into this fixing hole 31. A space penetrating in the thickness direction of the partition mounting part 3 is formed radially inside the position where the fireproofing support part 2 is formed. The long body L passes through this space. The partition mounting part 3 is cut by a separation slit 3a extending in the radial direction at one point in the circumferential direction. This separation slit 3a is continuous with one of the separation slits 21a between the divided pieces 21, 21. Therefore, a part that is divided in the circumferential direction is provided in the entire fireproofing material 1. This part is expanded in the circumferential direction to form a space, and the long body L is passed through this space, so that the fireproofing material 1 can be arranged so as to surround the long body L that has been passed through the through hole in advance.

[0037] The fireproof material 4 is provided so as to contact the fireproof material support part 2. A part of the fireproof material 4 is provided so as to wrap around the inner peripheral edge part of the partition body mounting part 3 (see FIG. 6). The fireproof material 4 is made of a material containing, for example, expansive graphite, and expands when heated (has thermal expansion). The expansion is prevented by the fireproof material support part 2, so that the expansion is performed on the opposite side of the fireproof material support part 2 where nothing is provided to prevent it. The fireproof material 4 is provided so as to be exposed at least on the radially outer side of the fireproof material support part 2 (for example, in the state before folding shown in FIG. 1, etc.), and expands in the radially outward direction of the fireproof material support part 2 when it receives heat applied to the partition body W during a fire. At the start of expansion, the fireproof material support part 2 is positioned so as to cover the through hole in the axial direction as shown in FIG. 8 (however, this relates to the third embodiment), so that the expansion of the fireproof material 4 in the "radially outward direction" is performed in a radially outward direction inclined with respect to the axial extension line of the center of the through hole. The expanded fireproof material 4 is attached to the surface W1 of the partition body W so as to surround the axial extension line of the center of the through hole, and therefore the through hole can be blocked on the axial extension line, and flames and hot air are prevented from flowing into the through hole in the event of a fire, and the fire spreads to adjacent partitions. The fireproof material 4 is preferably provided also on the radially inner side of the fireproof material support part 2 (in the state before bending shown in FIG. 1, etc.). In each embodiment, the fireproof material 4 is also provided on the radially inner side of the fireproof material support part 2. The fireproof material 4 on the radially inner side functions to block the through hole and to block the space that is created after the combustible material (such as the coating material of the electric wire) constituting the long body L is burned.

[0038] In the first embodiment, the fireproof material 4 is provided in the entire area of ​​the radial inner side of each divided piece 21 and in the protruding area 213 of the holding through hole 211 on the radial outer side. The fireproof material 4 is, for example, putty-like, and has flexibility at least when attached to each divided piece 21. The fireproof material 4 can be attached to the fireproof material support part 2 in a fluid state, for example, by using a technique of insert molding. However, when it is not necessary to pass the fireproof material 4 through the holding through hole 211, a relatively hard plate-like material can be used and attached by pasting to each divided piece 21. In this way, the fireproof material 4 expanded in the radially outward direction of the fireproof material support part 2 can suppress heat from passing through the through hole. Then, as described with respect to the holding through hole 211, the fireproof material 4 is arranged in the space formed by the holding through hole 211, so that the fireproof material support part 2 holds the fireproof material 4. The fireproof material 4 is reliably held by the fireproof material support part 2 by the holding through hole 211 provided in each divided piece 21.

[0039] In the fireproofing material 1 of each embodiment configured as described above, the fireproofing material support part 2 and the fireproofing material 4 are provided, and by fixing the fireproofing material support part 2 to the outside of the partition body W, the fireproofing material 4 can be arranged in the through hole. Therefore, the workability on site can be improved.

[0040] Next, the procedure for installing the fireproofing material 1 in the partition body W will be described using the fireproofing material 1 of the third embodiment as an example. First, as shown in Fig. 7, the fireproofing material 1 is placed in front of the through hole. At this time, the elongated body L is positioned in the radial center of the fireproofing material 1 by passing it radially through the separation slits 21a, 3a formed continuously between the divided pieces 21, 21 from the partition body mounting part 3. Then, the partition body mounting part 3 is fixed to the surface W1 of the partition body W with the screw S.

[0041] Next, the multiple divided pieces 21-21 located around the long body L are bent so that their tips face inwardly in the radial direction. The bending is performed sequentially on the divided pieces 21-21 arranged in the circumferential direction. Therefore, one divided piece 21 adjacent to the other divided piece 21 in the circumferential direction is partially overlapped with the other divided piece 21. Although not shown in the third embodiment, the additional portion 22 (see FIG. 1) provided in the same manner as in the first embodiment is deformed into a U-shape or the like as necessary, and the additional portion 22 is wrapped around or aligned along the long body L. This allows the fireproof material 4 to be tightly attached to the long body L.

[0042] Next, the engagement slit 233 of one of the engagement pieces 23 provided on one of the divided pieces 21 that are overlapped is engaged with the engagement slit 233 of the other engagement piece 23 provided on the other divided piece 21. The engagement is achieved by combining the long portion 231 of one engagement piece 23 with the short portion 232 of the other engagement piece 23. As a result, as shown in Fig. 8, the refractory material support part 2 is held in a state in which it is deformed into a polygonal pyramid or dome shape on the front side of the through hole. The protruding parts of each engagement piece 23 that are closer to the end than the engagement parts can be deformed so as to be rolled up or cut so as not to get in the way.

[0043] By the above steps, a fireproof structure C is constructed, which includes a partition W that divides a space into multiple sections, a long body L that penetrates the partition W, a fireproof material support part 2 provided around the position where the long body L passes, and a fireproof material 4 that is in contact with the fireproof material support part 2 and expands in the opposite direction to the fireproof material support part 2 when exposed to heat.

[0044] Although an embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

[0045] For example, in each of the above embodiments, one (lump) fireproofing material 1 is configured so that the fireproofing material support part 2 surrounds the axial extension line of the center of the through hole or the entire circumference of the long body L. However, this is not limited to this, and the fireproofing material 1 may be divided into multiple parts (such as two parts) in the circumferential direction, and a combination of multiple pieces may be used to surround the entire circumference of the long body L.

[0046] Also, the fireproof material support part 2 can be directly attached to the partition body W without providing the partition body attachment part 3.

[0047] In addition, in the first to third embodiments, one side of the engagement piece 23 in the longitudinal direction is a long portion 231 having a large longitudinal dimension, and the other side is a short portion 232, but both sides in the longitudinal direction may be the same length.

[0048] In the first to third embodiments, two engaging pieces 23 are provided facing each other in the radial direction, but only one may be provided and the engaging slit 233 may be engaged by folding back the engaging piece 23 itself. When only one is provided, the engaging piece 23 may have a length that can be wound around the long body L to engage with it. Three or more engaging pieces 23 may be provided. The shape of the engaging piece 23 is not particularly limited, and various modifications are possible as long as the engaging piece 23 itself, or the engaging piece 23 in the case where multiple engaging pieces 23 are provided, engages with other engaging pieces 23 to hold the multiple divided pieces 21-21 in a state where they are close to each other. The engaging piece 23 may also be engaged using an auxiliary tool (such as a clamp or wire) separate from the engaging piece 23.

[0049] In addition, in each of the above-described embodiments, the fire-resistant material 4 is provided on all of the multiple divided pieces 21-21. However, this is not limited to this, and divided pieces 21 may be provided without being provided with the fire-resistant material 4. In this case, the divided pieces 21 without being provided with the fire-resistant material 4 do not have an expansion function, and therefore function solely as covers for covering the through-holes of the partition body W. [Explanation of symbols]

[0050] 1 Fireproofing materials 2 Fireproof material support part 21 Split piece 21a Separation slit 211 Retention through hole 212 Inner and outer continuous slits 213 Prominent area 22 Addition 221 Horizontal slit 23 Engagement piece 231 Long section 232 Short section 233 Engagement slit 3 Partition mounting part 3a Separation slit 31 Fixing hole 4 Fireproof material C Fireproof structure W Partition (wall) W1 Partition surface L Long body S screw

Claims

1. A partition that divides a space, the partition having a through hole formed therein, and a fireproof material support portion fixed to the outside of the partition and provided around an axial extension line of the center of the through hole; A fireproof material that is in contact with the fireproof material support portion and expands in a direction opposite to the fireproof material support portion when heated; A fire-resistant material equipped with

2. 2. The fireproofing material according to claim 1, wherein the fireproofing material is provided radially outside the fireproofing support portion and expands radially outwardly of the fireproofing support portion when exposed to heat.

3. The refractory support portion has a retaining through hole, The fireproofing material according to claim 1 , wherein the fireproofing material is disposed in a space defined by the holding through-hole, so that the fireproofing material support portion holds the fireproofing material.

4. 2. The fireproofing material according to claim 1, wherein the fireproofing support portion is made of a deformable material and is composed of a plurality of divided pieces separated in a circumferential direction.

5. 5. The fireproofing material according to claim 4, wherein at least some of the divided pieces have a plastically deformable additional portion provided on an end side farther from the partition body in the fixed state.

6. At least some of the plurality of divided pieces are provided with engagement pieces, The fireproofing material according to claim 4, wherein the engaging piece holds the plurality of divided pieces in close proximity by engaging with itself or with another engaging piece when a plurality of the engaging pieces are provided.

7. A partition body that divides the space into multiple parts; An elongated body penetrating the partition body; A fireproof material support portion provided around a position where the elongated body passes; A fireproof material that is in contact with the fireproof material support portion and expands in a direction opposite to the fireproof material support portion when heated; Fire-resistant construction with

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