JP5128249B2 - Fireproof structure for the eaves - Google Patents

Description

  The present invention relates to a fireproof structure for the back of an eave, in which an eaves back ceiling plate is provided on a fireproof outer wall surface below the eaves of a building roof.

  As a conventional fireproof structure for the eaves, there is a structure in which a fireproof eaves back ceiling board is provided on the outer wall surface below the eaves of the building roof as described in Japanese Patent Laid-Open No. 2001-020408 (Patent Document 1). . In addition, as described in Japanese Patent No. 3898831 (Patent Document 2), there are some which improve the fire resistance performance by stacking two eave roof materials below the eaves of the building roof.

JP 2001-020408 A Japanese Patent No. 3898831

  However, in the above-described conventional example, the refractory eaves back ceiling plate is horizontally stretched and supported at both ends, so the plate thickness is reduced for weight reduction, the strength is weak, and it is broken because it is easily damaged by external force. In some cases, there was a problem that the fireproof performance could not be exhibited. Moreover, when a fireproof eaves back ceiling board is piled up twice, there exists a problem that a weight will become large and a horizontal support structure will enlarge.

  The present invention solves the above-mentioned problems, and its object is to provide a fireproof structure for the eaves that can exhibit complete fireproof performance even if the ceiling plate of the fireproof eaves is damaged. is there.

The first configuration of the eaves back refractory structure according to the present invention for achieving the above object has the soffit below the building roof, a beam for supporting the roof, and a refractory outer wall plate, said refractory outer wall In the fireproof structure for the eaves back, in which an eaves ceiling plate is provided on the outer wall surface of the board, the outer wall side of the fireproof outer wall plate from the beam between the upper end of the fireproof outer wall plate and the eaves back of the building roof In the fireproof outer wall plate, a continuous fireproof plate is provided , and the fireproof plate is attached to a fireproof plate receiving portion fastened to the beam by a member inserted into a through hole formed in the beam, The fireproof plate receiving portion is fixed to the beam only from the outer wall surface side of the fireproof outer wall plate of the beam .

Further, the second configuration of the fireproof structure for eaves according to the present invention is characterized in that, in the first configuration, the fireproof plate is made of the same material and the same thickness as the fireproof outer wall plate. And

  Moreover, the 3rd structure of the fireproof structure for eaves back which concerns on this invention is a fireproof eaves back ceiling board in the said 1st, 2nd structure, The said eaves back ceiling board is characterized by the above-mentioned.

According to the first configuration of the fireproof structure for the eaves according to the present invention, the fireproof eaves roof ceiling board has no fire resistance due to the fireproof plate provided between the upper end of the fireproof outer wall surface and the eaves of the building roof. Both can satisfy the specification standards stipulated in the Building Standards Law and the law on promotion of ensuring the quality of houses. Furthermore, since the fireproof plate can be fixed to the beam of the building only from the outer wall surface side, it can be retrofitted to an existing building with a simple operation.

  Moreover, according to the 2nd structure of the fireproof structure for eaves back which concerns on this invention, it is comparable as an outer wall by comprising a fireproof board with the same material and the same thickness as the fireproof outer wall board which comprises a fireproof outer wall surface. Fire resistance can be obtained.

  Moreover, according to the 3rd structure of the fireproof structure for eaves back which concerns on this invention, the eaves back ceiling board was made into the fireproof eaves back ceiling board, this fireproof eaves back ceiling board, the upper end of a fireproof outer wall surface, and a building A fireproof plate provided between the roof eaves of the roof and a fireproof double structure.

  An embodiment of a fireproof structure for eaves according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a cross-sectional explanatory view showing the configuration of the first embodiment of the fireproof structure for the eaves according to the present invention, FIG. 2 is an exploded perspective view showing how the fireproof plate is fixed to the steel beam of the building from the outer wall side, FIG. Fig. 4 is an exploded perspective view of the fireproof plate bracket A, Fig. 4 is a cross-sectional explanatory view showing the configuration of the second embodiment of the eaves-side fireproof structure according to the present invention, and Fig. 5 is the first view of the eaves-side fireproof structure according to the present invention. 6 is an exploded perspective view showing the configuration of the second embodiment, FIG. 6 is a cross-sectional explanatory view showing a state in which the refractory plate bracket B is attached to the beam, FIG. 7 is a three-view diagram showing the configuration of the refractory plate bracket B, FIG. 9 is a cross-sectional explanatory view showing another structure of the fireproof structure for the eaves according to the present invention, and FIG. 10 is an exploded perspective view showing a state in which the fireproof plate brackets A and B are attached to the beam.

  1 and 4 show the eaves back provided with a fireproof eaves back ceiling plate 12 on a lightweight cellular concrete (ALC) fireproof outer wall plate 2 constituting the fireproof outer wall surface below the eaves back 1a of the building roof 1 inclined at a predetermined gradient. The fireproof structure is shown. Between the upper end of the refractory outer wall plate 2 constituting the refractory outer wall surface and the eaves back 1a of the building roof 1, an eaves refractory plate 3 is provided.

  The refractory plate 3 for the eaves is made of the same lightweight cellular concrete (ALC) material as the refractory outer wall plate 2 constituting the refractory outer wall surface, and has the same thickness, and is attached to the steel beam 4 of the building by the refractory plate brackets A and B. It is fixed only from the outer wall side.

  In FIG. 1 and FIG. 4, the eaves back 1 a of the building roof 1 is continuously fire-resistant for eaves made of lightweight cellular concrete (ALC) on the top of the fire-resistant outer wall plate 2 made of lightweight cellular concrete (ALC) on the top floor. A plate 3 is attached to a steel beam 4 that supports the roof 1.

  1 to 3 includes a pair of flat plates 5 that are longer than the outer diameter of the through hole 4a1 provided in the web 4a of the steel beam 4 and shorter than the height of the web 4a. The refractory plate receiving portion provided on the standing piece 6a of the L-shaped plate 6 of the present embodiment is configured to further include a refractory plate receiving piece 6b bent at a right angle from the rising piece 6a. And has a Z-shaped cross section as a whole. In addition, the refractory plate receiving piece 6b can be bent from the upright piece 6a to the fixed piece 6c side where the bolt insertion hole 6c1 is provided, and the whole can be configured in a U-shaped cross section. In addition, when fixing the fire-resistant plate bracket A to the web 4a with a bolt and nut, a Z-shaped cross section is preferable in order to make a work space easy.

  The length from the center of the bolt insertion hole 5b provided in the flat plate 5 to the one end 5a of the flat plate 5 is the length from the center in the height direction of the web 4a of the steel beam 4 to the upper surface of the lower flange 4c of the steel beam 4. Is set.

  At one end of the L-shaped plate 6, a notched portion 6 d is formed by notching a part of the standing piece 6 a and the refractory plate receiving piece 6 b.

  When attaching the refractory plate support A to the web 4a of the steel beam 4, first, the bolt 7 is inserted into the bolt insertion hole 5b of the flat plate 5 and the bolt insertion hole 6c1 of the L-shaped plate 6 from the flat plate 5 side. 7, with one end of the flat plate 5 inserted into the indoor side of the web 4a from the through hole 4a1 of the web 4a of the steel beam 4 with the nut 8 temporarily fixed from the L-shaped plate 6 side, and the other end of the flat plate 5 is further inserted The web 4 a is disposed between the flat plate 5 and the L-shaped plate 6 by being inserted into the indoor side of the web 4 a from the through hole 4 a 1. At this time, the lower end 5 a of the flat plate 5 is brought into contact with the upper surface of the lower flange 4 c of the steel beam 4.

  A pair of flat plates that are longer than the outer diameter of the through hole 4a1 and shorter than the height of the web 4a on both sides of the web 4a at the periphery of the through hole 4a1 provided in the web 4a of the steel beam 4 5 and the L-shaped plate 6 are brought into contact with each other, and bolts to be inserted into bolt insertion holes 5b and 6c1 provided in a range in the through hole 4a1 of the web 4a of each steel beam 4 of the flat plate 5 and the L-shaped plate 6 A nut 8 is screwed to 7 and the flat plate 5 and the L-shaped plate 6 are fixed with the web 4 a of the steel beam 4 interposed therebetween.

  As shown in FIG. 2, the fire-resistant plate receiving piece 6b which becomes the fire-resistant plate receiving portion of the plurality of fire-resistant plate receiving brackets A attached to the periphery of the through-hole 4a1 of the web 4a of the steel beam 4 is a long U-shaped cross section. The member 9 is passed and abutted and fixed by the drill screw 10. Then, the eaves back fireproof plate 3 is attached to the long member 9 with a drill screw 11. In addition, it is more preferable if a space is provided between a heat insulating plate (not shown) provided on the indoor side of the web 4a of the steel beam 4 and the web 4a.

  Alternatively, the elongate refractory plate 3 may be directly attached to the refractory plate receiving piece 6b of the refractory plate receiving bracket A with the drill screw 11 without the long member 9.

  In the second embodiment shown in FIGS. 4 to 7, the web 4 a of the steel beam 4 is shown in FIGS. 4 to 6 when there is no through hole 4 a 1 or when there is another obstacle and the through hole 4 a 1 cannot be used. As described above, the refractory plate bracket B that can be attached to the steel beam 4 using a pair of through holes 4b1 and 4c1 provided in the upper and lower flanges 4b and 4c of the steel beam 4 is used.

  As shown in FIG. 7, the fireproof plate bracket B is provided with shaft portions 22 and 23 at both ends of a box-type fireproof plate receiving portion 21 for attaching the fireproof plate 3 for the eaves back. The part 22 is provided with a ring-shaped locking part 22a, and the other shaft part 23 is provided with a screw part 23a.

  Then, as shown in FIG. 6, with the nut 24 screwed to a position near the fireproof plate receiving portion 21 of the screw portion 23a, the through hole 4c1 of the lower flange 4c is formed from the upper surface side of the lower flange 4c of the steel beam 4. After inserting one shaft portion 23 in the inside, the other shaft portion 22 is inserted into the through hole 4b1 of the upper flange 4b from the lower surface side of the upper flange 4b of the steel beam 4, and the nut 24 is moved along the screw portion 23a. The locking portion 22a of the shaft portion 22 is brought into contact with and locked to the lower surface of the upper flange 4b, and the nut 24 is brought into contact with the upper surface of the lower flange 4c to be fastened and fixed. .

  As described above, the shaft portions 22 and 23 provided at both ends of the fireproof plate receiving portion 21 for attaching the fireproof plate 3 for the eaves of the fireproof plate receiving bracket B are provided on the upper and lower flanges 4b and 4c of the steel beam 4. The engaging portions 22a inserted into the pair of through holes 4b1 and 4c1 and provided on one shaft portion 22 are engaged with the inner surface of the upper flange 4b, which is one flange, and the other shaft portion 23 is inserted. A nut 24 screwed into a screw portion 23a provided on the inner surface of the lower flange 4c is abutted and locked to the inner surface of the lower flange 4c.

  In the same manner as in the above-described embodiment, the long member 9 is passed to the fireproof plate receiving portions 21 of the plurality of fireproof plate receiving brackets B attached to the upper and lower flanges 4b and 4c of the steel beam 4 and fixed by the drill screw 10. The eaves-side fireproof plate 3 can be attached to the long member 9 with a drill screw 11. Alternatively, the elongate fireproof plate 3 may be directly attached to the fireproof plate receiving portion 21 of the fireproof plate receiving bracket B by the drill screw 11 without the long member 9.

  When the veranda is provided at a position lower than the upper surface of the steel beam 4, the floor surface of the veranda is set at a position lower than the floor surface of a general floor panel. Therefore, as shown in FIG. The length of the shaft portion 22 is appropriately set so as not to interfere with the material 25. Similarly, the notch 6d provided in the L-shaped plate 6 of the refractory plate bracket A is formed so as not to interfere with the dropping angle member 25 on the veranda floor.

  8 and 9, a fireproof nose concealment plate 32 made of lightweight cellular concrete (ALC) supported by a steel beam 31 from a horizontal building roof 1 is suspended, and the lower part of the fireproof nose concealment plate 32 and the fireproof outer wall plate 2 The refractory eaves back ceiling board 12 is supported horizontally between the upper part. Also in the present embodiment, the eaves-back refractory plate 3 can be fixed to the steel beam 4 only from the outer wall side by the refractory plate receiving brackets A and B. Other configurations are the same as those in the above embodiment, and have the same effects.

  FIG. 10 shows that the fireproof plate brackets A and B are selectively attached to the steel beam 4 appropriately, the long member 9 is omitted, and the fireproof plate 6a of the fireproof plate bracket A connected to the upright piece 6a. This is an example in which the fireproof plate 3 for the eaves back is directly attached to the fireproof plate receiving portion 21 of the plate receiving piece 6b and the fireproof plate receiving bracket B by the drill screw 11.

  According to the above configuration, the refractory eaves roof ceiling plate 12 is damaged by the eaves-retaining fire plate 3 provided between the upper end of the fire-resistant outer wall plate 2 constituting the fire-resistant outer wall surface and the eaves back 1 a of the building roof 1. Even so, it can satisfy the specification standards stipulated in the Building Standards Law and the Law on Promotion of Housing Quality Assurance.

  Further, the fireproof plate 3 for the eaves can be made of the same material and with the same thickness as the fireproof outer wall plate 2 constituting the fireproof outer wall surface, so that the same level of fire resistance can be obtained.

  Moreover, since the eaves back ceiling board is the fireproof eaves back ceiling board 12, the fireproof eaves back ceiling board 12, the upper end of the fireproof outer wall board 2 constituting the fireproof outer wall surface, and the eaves back 1a of the building roof 1 are arranged. A double fire-resistant structure can be formed by the eaves-back fire-resistant plate 3 provided on the eaves.

  In addition, since the refractory plate 3 for the eaves can be fixed to the steel beam 4 of the building only from the outer wall side using the refractory plate fittings A and B, it can be retrofitted to an existing building with a simple operation.

  As an application example of the present invention, the present invention can be applied to a fireproof structure for the back of an eave, in which an eaves back ceiling plate is provided on the fireproof outer wall surface below the eaves of a building roof.

It is a section explanatory view showing the composition of a 1st embodiment of the fireproof structure for eaves back concerning the present invention. It is a disassembled perspective view which shows a mode that a fireproof board is fixed to the steel beam of a building from the outer wall side. It is a disassembled perspective view of the refractory plate bracket A. It is sectional explanatory drawing which shows the structure of 2nd Embodiment of the fireproof structure for eaves back which concerns on this invention. It is a disassembled perspective view which shows the structure of 2nd Embodiment of the fireproof structure for eaves back concerning this invention. It is sectional explanatory drawing which shows a mode that the refractory board metal fitting B was attached to the beam. 3 is a three-sided view showing a configuration of a refractory plate bracket B. FIG. It is sectional explanatory drawing which shows the other structure of the fireproof structure for eaves back concerning this invention. It is sectional explanatory drawing which shows the other structure of the fireproof structure for eaves back concerning this invention. It is a disassembled perspective view which shows a mode that the fire-resistant plate brackets A and B were attached to the beam.

Explanation of symbols

A, B ... Refractory plate bracket 1 ... Building roof 1a ... Eave back 2 ... Fire resistant outer wall plate 3 ... Fire proof plate for eaves back 4 ... Steel beam 4a ... Web
4a1 ... Through hole 4b, 4c ... Upper and lower flanges
4b1, 4c1 ... through hole 5 ... flat plate 5a ... one end (lower end)
5b ... Bolt insertion hole 6 ... L-shaped plate 6a ... Standing piece 6b ... Fireproof plate receiving piece 6c ... Fixed piece
6c1 ... Bolt insertion hole 6d ... Notch 7 ... Bolt 8 ... Nut 9 ... Long member
10, 11 ... Drill screw
12… Fireproof eaves back ceiling board
21 ... Fireproof plate receiving part
22, 23 ... Shaft
22a ... Locking part
23a ... Screw part
24 ... Nut
31 ... Steel beam
32 ... Fireproof nose cover

Claims (3)

The soffit below the building roof, the beams supporting the roof, and a refractory outer wall plate, the eaves back refractory structure in which a soffit ceiling plate on the outer wall surface of the refractory wall panels,
Between the upper end of the fireproof outer wall plate and the eaves of the building roof, on the outer wall surface side of the fireproof outer wall plate from the beam, a fireproof plate continuous to the fireproof outer wall plate is provided ,
The refractory plate is attached to a refractory plate receiving portion fastened to the beam by a member inserted into a through hole formed in the beam.
The eaves-side fireproof structure , wherein the fireproof plate receiving part is fixed to the beam only from the outer wall surface side of the fireproof outer wall plate of the beam . The fireproof structure for the eaves according to claim 1 , wherein the fireproof plate is made of the same material as the fireproof outer wall plate and has the same thickness.   The fireproof structure for an eaves according to claim 1 or 2, wherein the eaves roof ceiling board is a fireproof eaves back ceiling board.

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