JP6612544B2 - Thermal insulation structure of building - Google Patents

Description

  The present invention relates to a heat insulating fireproof structure for a building.

  The following Patent Document 1 discloses an invention related to a heat insulating structure in a building. In the heat insulating structure in this building, a floor beam heat insulating material is disposed on the indoor side of the floor beam so as to cover the floor beam. Moreover, the upper end part of the floor beam heat insulating material is in contact with the lower surface of the floor board material, and forms a continuous heat insulating line with the wall heat insulating material disposed on the indoor side in the wall. For this reason, the thermal bridge by a floor girder can be suppressed.

Japanese Patent Laying-Open No. 2008-150790 (FIG. 3)

  By the way, when building a building to which the heat insulation structure in the building disclosed in Patent Document 1 is applied in a semi-fire prevention area or a fire prevention area, in order to ensure the fire resistance performance of the floor portion, the floor board material is used as a semi-incombustible material or non-combustible material. It must be composed of materials. However, in the said patent document 1, it does not mention about comprising a floor board material with a quasi-incombustible material or a non-combustible material, and there exists room for improvement in the viewpoint of coexistence with the heat insulation performance and fireproof performance of a floor part.

  In view of the above facts, an object of the present invention is to obtain a heat insulating and fireproof structure for a building that can achieve both the heat insulating performance and the fireproof performance of the floor.

  The heat insulation fireproof structure of the building which concerns on a 1st aspect is comprised including the flange part which faces a building upper side, and the web part extended to the building lower side from the peripheral part of the outdoor side of the said flange part. And a floor plate material having a non-combustible property equal to or greater than the quasi-incombustible material, and a plurality of sheets are laid along the longitudinal direction of the floor large beam on the building upper side of the flange portion to constitute the floor portion of the building. The outer heat insulating material that covers the outdoor side of the web portion, and is interposed between the flange portion and the floor board material, supports the floor board material, has non-combustibility higher than the quasi-incombustible material, and the building height direction A plurality of types of joists having different dimensions.

  In the heat insulation fireproof structure of the building which concerns on a 1st aspect, the floor part beam includes the flange part which faces a building upper side, and the web part extended to the building lower side from the peripheral part of the outdoor side of the said flange part. It consists of And the floor part of a building is comprised in the building upper part side of the flange part of a floor beam by laying a plurality of floor board materials which have nonflammability more than a semi-incombustible material along the longitudinal direction of a floor beam. Further, the floor board material is supported by a joist interposed between the flange portion of the floor beam and the floor board material, and the joist has an incombustibility higher than that of the semi-incombustible material. For this reason, the fireproof performance of the floor part of a building is securable. On the other hand, the outdoor side of the web portion of the floor girder is covered with an outer heat insulating material. Thereby, the thermal bridge by a floor girder can be suppressed.

  By the way, in the floor board material composed of a material having incombustibility higher than the semi-incombustible material and the wooden floor board material having the same shape as the floor board material, the floor board material composed of a material having incombustibility higher than the semi-incombustible material is more preferable. Become heavier. For this reason, if the floorboard material is made of a material having nonflammability that is equal to or greater than that of the semi-incombustible material while maintaining the shape of the floorboard material, the weight of the floor of the building increases, and the inertial force generated on each floor during an earthquake, etc. To increase. Therefore, when ensuring the fire resistance of the floor of the building, it is preferable to take measures against an increase in the weight of the floor.

  Here, in this aspect, the building has a plurality of types of joists having different dimensions in the height direction of the building, and maintains the height of the floor surface of the floor portion composed of the floorboard material, while the building height direction of the joists The thickness of the floor board material can be changed according to the dimensions. For this reason, in this aspect, the thickness of the floor board material can be adjusted according to the proof stress necessary for each location of the floor portion, and as a result, the thickness of the floor slab material at the location where the proof stress is not required in the floor portion. By reducing the thickness, an increase in the weight of the floor can be suppressed.

  The heat insulation fireproof structure of the building which concerns on a 2nd aspect is a heat insulation fireproof structure of the building which concerns on a 1st aspect. WHEREIN: The said joist is an upper wall part extended in the longitudinal direction of the said floor girder, and the said upper wall part A pair of side wall portions extending from the respective peripheral portions of the outdoor side and the indoor side to the building lower side, and made of steel, and further, the side wall on the outdoor side of the joists It has an inner heat insulating material that covers the part.

  In the heat insulation fireproof structure of the building which concerns on a 2nd aspect, a joist extends to the building lower side from the upper wall part extended in the longitudinal direction of a floor girder, and each peripheral part of the outdoor side of the said upper wall part, and an indoor side. It is made of steel while being configured to include a pair of side wall portions that are taken out. For this reason, the nonflammable performance of the joist can be improved as compared with the case where the joist is made of a semi-incombustible material such as a wood-based cement board.

  However, if the joists are made of steel, it is considered that a thermal bridge is formed by the joists. Here, in this aspect, by setting the joist to the above configuration, the joist has a bending rigidity that is more efficient with respect to the outer dimension and cross-sectional area of the joist's vertical cross section than when the joist is made of a quasi-incombustible material. Can be secured. For this reason, the space | interval of the side wall part of a joist can be narrowed, and a space can be ensured on the outdoor side of the joist in the flange part of a floor beam. As a result, by arranging the inner heat insulating material in the outdoor space of joist and covering the side wall portion of the outdoor side of joist with the inner heat insulating material, it is possible to suppress the thermal bridge from being generated by the joist.

  The heat insulation and fireproof structure of a building according to a third aspect is the heat insulation and fireproof structure of the building according to the second aspect, wherein the building is composed of a plurality of building units, and the frame of the building unit includes the floor beam and the floor. A large beam and a ceiling beam arranged facing the building height direction, and further spanned between the floor beam and the ceiling beam of the building unit constituting the lower floor side of the building. And a spacer that is disposed on the outdoor side of the joist in the flange portion and partitions the inner heat insulating material, and a heat insulating material that covers the outdoor side of the heat insulating pillar, and the heat insulating material for the pillar is the outer heat insulating material. And are arranged continuously.

  In the heat insulating fireproof structure of the building according to the third aspect, the building is composed of a plurality of building units, and the ceiling of the building unit is arranged facing the floor beam and the floor beam in the building height direction. It is composed of large beams. And in the building unit which comprises the lower floor side of a building, the stud is arrange | positioned in the space of the outdoor side of the joist in the flange part of a floor girder, and the said stud is spanned by the floor girder and the ceiling girder. For this reason, the ceiling girder and floor girder on the lower floor side are reinforced, and the span length of the beam of the building unit constituting the lower floor side is lengthened, or some of the pillars of the plurality of building units on the lower floor side are removed. Even if the large space is configured, it is possible to suppress an increase in the bending generated in the ceiling beam and the floor beam.

  Further, in this aspect, by arranging the studs as described above, the inner insulating material is partitioned by the studs, but the outdoor side of the studs is covered with the stud insulating material, and the stud insulating material is continuous with the outer insulating material. Are arranged. For this reason, the heat insulation layer extended in the building height direction can be ensured on the outdoor side of the stud.

  The heat insulation fireproof structure of the building which concerns on a 4th aspect is a heat insulation fireproof structure of the building which concerns on a 2nd aspect or a 3rd aspect, The said joist is welded to the said flange part.

  In the heat insulation fireproof structure of the building which concerns on a 4th aspect, since the joist is welded to the flange part of a floor beam, a floor board material can be arranged on the joist in the state where the joist was positioned in the flange part. .

  The heat insulation fireproof structure of the building which concerns on a 5th aspect is a heat insulation fireproof structure of the building which concerns on a 1st aspect, The said joist is comprised with the wood-type cement board.

  In the heat insulation fireproof structure of the building which concerns on a 5th aspect, since a joist is comprised with the wood-type cement board, a space can be ensured on the flange part of a floor beam by notching a joist. For this reason, it is possible to add a spacer or the like on the flange portion of the floor girder.

  The heat insulation fireproof structure of the building which concerns on a 6th aspect is a heat insulation fireproof structure of the building which concerns on any 1 aspect of a 1st aspect-a 5th aspect, The said floor board material is comprised with the wood-type cement board. .

  In the heat insulation fireproof structure of the building which concerns on a 6th aspect, since a floor board material is comprised with the wood-type cement board, compared with the case where a floor board material is comprised with a lightweight cellular concrete, a floor part can be reduced in weight. .

  As described above, the heat insulating and fireproof structure for a building according to the first aspect has an excellent effect that it is possible to achieve both the heat insulating performance and the fireproof performance of the floor portion.

  In the heat insulation fireproof structure of the building which concerns on a 2nd aspect, while ensuring the heat insulation performance of a floor part, the improvement that the improvement of the fireproof performance of the floor part of a building and the design freedom of the surrounding part of a joist can be aimed at It has the effect.

  In the heat insulation fireproof structure of the building which concerns on a 3rd aspect, it has the outstanding effect that the heat insulation of a building can be ensured, respond | corresponding to various housing plans.

  In the heat insulation fireproof structure of the building which concerns on a 4th aspect, it has the outstanding effect that the installation operation to the joist of a floor board material can be simplified.

  In the heat insulation fireproof structure of the building which concerns on a 5th aspect, it has the outstanding effect that it can respond flexibly also to the change of a house plan, ensuring the fireproof performance of a building.

  In the heat insulation fireproof structure of the building which concerns on a 6th aspect, it has the outstanding effect that the inertia force which generate | occur | produces on each floor at the time of an earthquake etc. can be made small compared with the case where a floor board material is comprised with lightweight cellular concrete.

It is an expanded sectional view (sectional view showing the state where it cut along line 1-1 of Drawing 6) which shows the composition around the floor of the building concerning a 1st embodiment. (A) is a front view seen from the outdoor side showing the fit of joists, (B) is a sectional view showing the fit of joists (along line 2B-2B in FIG. 2 (A)) FIG. It is an expanded sectional view (sectional view which shows the state cut | disconnected along the 3-3 line of FIG. 6) which shows the accommodation by the side below the building of the stud in the building which concerns on 1st Embodiment. It is an expanded sectional view (sectional view which shows the state cut | disconnected along line 4-4 of FIG. 6) which shows the accommodation of the stud and outer wall frame in the building which concerns on 1st Embodiment. It is a perspective view which shows the structure of the inner wall frame and outer wall frame of the building which concern on this embodiment. It is a perspective view which shows the building unit which comprises the building which concerns on 1st Embodiment. It is a perspective view which shows the building which concerns on 1st Embodiment. It is an expanded sectional view (sectional view equivalent to the state where it cut along line 1-1 of Drawing 6) showing composition of a floor part periphery of a building concerning a 2nd embodiment. According to the second embodiment, (A) is a front view showing the accommodation of joists, and (B) is a cross-sectional view showing the accommodation of joists (along line 9B-9B in FIG. 9A). FIG.

<First Embodiment>
Hereinafter, an example of a building 10 to which the heat insulating fireproof structure of a building according to the first embodiment of the present invention is applied will be described with reference to FIGS.

  First, the overall structure of the building 10 according to the present embodiment will be described. As shown in FIG. 7, the building 10 according to the present embodiment has a plurality of lower floor side building units 14, 16 installed on the foundation 12, and then is placed on the lower floor side building units 14, 16. A plurality of building units 18 and 20 on the upper floor side are installed.

  Next, taking the building unit 14 as an example, the configuration of the frame 22 as a frame of the building unit 14 will be described. As shown in part in FIG. 5, the frame 22 includes a pillar 24 erected at four corners, a ceiling frame 26 that connects upper ends of the pillar 24, and a floor that connects lower ends of the pillar 24. Frame 28. The ceiling frame 26 includes a ceiling beam 30 made of channel steel and a ceiling beam 32 shorter than the ceiling beam 30 arranged in a rectangular frame shape, and a plurality of ceiling beams (not shown) between the ceiling beams 30. Is constructed at a predetermined interval. The floor frame 28 has the same configuration as that of the ceiling frame 26, and is configured by arranging a floor girder 34 made of channel steel and a floor girder 36 shorter than the floor girder 34 in a rectangular frame shape. ing. More specifically, the floor girder 34 includes an upper flange portion 34A facing the upper side of the building, and a web portion 34B extending from the outer peripheral edge of the upper flange portion 34A to the lower side of the building. Has been. And the ceiling part is comprised in the building lower side of the ceiling frame 26 including the ceiling base material and ceiling material which are not shown in figure.

  On the other hand, as shown in FIG. 6, outer wall panels 38, 40, 42 are attached side by side along the outer peripheral surface of the building 10 on the outdoor side of the ceiling beam 30 and the floor beam 34, and the outer wall 44 of the building 10. Part of. A plurality of outer wall panels 38 are arranged side by side to constitute a general part of the outer wall 44, the outer wall panel 40 constitutes a connecting part of the building units 14 and 16 on the outer wall 44, and the outer wall panel 42 is The corner of the building unit 14 in the outer wall 44 is configured. The configuration of the outer wall panel 40 will be described later.

  First, the structure of the outer wall panel 38 which comprises the general part of the outer wall 44 is demonstrated. As shown in FIGS. 1 and 5, the outer wall panel 38 includes a rectangular frame-shaped outer wall frame 46 and a rectangular flat plate-shaped outer wall member 48, and the width direction of the building unit 14 is It is arranged in the longitudinal direction.

  The outer wall frame 46 is stretched over the vertical beams 50 and 52 extending in the building height direction, the horizontal beam 54 spanned over the upper ends of the vertical beams 50 and 52, and the lower ends of the vertical beams 50 and 52. The horizontal crosspiece 56 is included. Specifically, the vertical beam 50 is made of angle steel (angle), and the web portion 50A is disposed on the outer side in the width direction of the outer wall panel 38, and the flange portion 50B is disposed on the outdoor side. . On the other hand, the vertical beam 52 is configured symmetrically with the vertical beam 50 with respect to the center line in the width direction of the outer wall panel 38. An outer wall material 48 is attached to the flange portion 50B of the vertical beam 50 and the flange portion 52A of the vertical beam 52 as described later.

  On the other hand, the horizontal rail 54 is made of channel steel, and the web portion 54A is disposed on the lower side of the building. Then, the upper end of the vertical beam 50 is joined to one end portion in the width direction of the outer wall panel 38 in the web portion 54A, and the upper end portion of the vertical beam 52 is joined to the other end portion of the web portion 54A by welding means or the like. Yes. In addition, an outer wall member 48 is attached to the flange 54B on the outdoor side of the horizontal rail 54 as will be described later.

  Further, weld nuts (not shown) are provided at a plurality of locations in the width direction of the outer wall panel 38 on the outdoor side surface of the flange portion 54 </ b> C on the indoor side of the horizontal rail 54. On the other hand, an insertion hole (not shown) corresponding to the weld nut of the cross beam 54 is formed in the web portion 30 </ b> A of the ceiling beam 30. A bolt (not shown) is screwed into the weld nut of the cross beam 54 from the indoor side of the web portion 30 </ b> A of the ceiling beam 30, so that the upper side of the building of the outer wall frame 46 is fixed to the ceiling beam 30.

  On the other hand, the horizontal rail 56 extends in the width direction of the outer wall panel 38 and has a plate thickness direction that is a vertical direction of the building, and a building lower side from the outdoor side end of the upper wall portion 56A. And a front wall portion 56 </ b> B extending in the shape of an L-shaped cross section. Then, the lower end portion of the vertical beam 50 is joined to one end portion of the outer wall panel 38 in the width direction of the upper wall portion 56A, and the lower end portion of the vertical beam 52 is joined to the other end portion of the upper wall portion 56A by a welding means or the like. Has been. Note that an outer wall member 48 is attached to the front wall portion 56B as will be described later.

  In addition, brackets 58 each having a vertical wall portion 58A facing the floor large beam 34 and having an L-shaped cross section are welded to both ends in the width direction of the outer wall panel 38 in the upper wall portion 56A of the cross rail 56. It is joined by the joining means. An insertion hole (not shown) is formed in the vertical wall portion 58A of the bracket 58, while a weld nut 60 corresponding to the insertion hole is provided in the web portion 34B of the floor girder 34. The bolt 62 is screwed into the weld nut 60 from the outside of the web portion 34 </ b> B of the floor girder 34, so that the lower side of the outer wall frame 46 is fixed to the floor girder 34.

  When the outer wall frame 46 configured as described above is attached to the housing frame 22, the web portion 50 </ b> A of the vertical rail 50 of one outer wall frame 46 and the web portion 52 </ b> B of the vertical rail 52 of the other outer wall frame 46 are in contact with each other. It is in the state. Further, in this state, the insertion holes (not shown) formed at a plurality of locations in the building height direction of the web part 50A and the insertion holes (not shown) corresponding to the insertion holes of the web part 52B are aligned. Yes. Then, bolts (not shown) are inserted into these insertion holes, and nuts (not shown) are screwed into the bolts so that the outer wall frames 46 are connected to each other.

  Further, the outer wall material 48 is in contact with the flange portion 50B of the vertical beam 50 and the flange portion 52A of the vertical beam 52 via a water blocking material (not shown) that covers the boundary between the outer wall frames 46. Then, the tapping screw 64 is attached from the outdoor side of the outer wall member 48, and the outer wall member 48 is fixed to the flange portions 50B and 52A, the flange portion 54B of the horizontal beam 54, and the front wall portion 56B of the horizontal beam 56. The outer wall panel 38 is configured.

  Further, as shown in FIG. 4, an outer heat insulating material 66 is fitted inside each outer wall frame 46, and the outer heat insulating material 66 is a rectangular plate made of XPS (extruded polystyrene foam) as an example. Configured. In the outer heat insulating material 66, peripheral portions on both sides in the width direction of the outer wall panel 38 are in contact with inner peripheral surfaces of the vertical bars 50 and 52 of the outer wall frame 46, respectively. In addition, the peripheral edge of the outer heat insulating material 66 on the upper side of the building is in contact with the web portion 54A of the horizontal crosspiece 54, and the peripheral edge of the outer heat insulating material 66 on the lower side of the building is the upper wall portion of the horizontal crosspiece 56. It is in contact with 56A. Furthermore, the outdoor side portion of the outer heat insulating material 66 on the lower side of the building covers the portion on the upper side of the building with respect to the horizontal beam 56 in the web portion 34B of the floor beam 34.

  The outer wall panel 42 arranged at the corner of the building unit 14 has the same configuration as the outer wall panel 38, but the length of the horizontal beam constituting the outer wall frame (not shown) of the outer wall panel 42 is the horizontal beam. The length is set to be shorter than the lengths 54 and 56. Therefore, the outer wall material 68 constituting the outer wall panel 42 is made narrower than the outer wall material 48, and the outer heat insulating material (not shown) arranged inside the outer wall frame of the outer wall panel 42 is also narrower than the outer heat insulating material 66. It is said that.

  On the other hand, as shown in FIGS. 4 and 5, the inner wall 70 of the building 10 is an inner wall member 74 formed of a rectangular flat plaster board on each of the inner wall frames 72 arranged in the longitudinal direction of the building unit 14. It is comprised by being attached. The inner wall frame 72 includes a pair of prismatic and wooden vertical bars 76 extending in the height direction of the building, and a pair of rectangular pillars and wooden horizontal bars 78 extending in the longitudinal direction of the building unit 14. Including a rectangular frame shape. More specifically, the cross-sectional shapes of the vertical beam 76 and the horizontal beam 78 are rectangular with the short direction of the building unit 14 as the long direction. Further, both ends of the horizontal beam 78 on the upper side of the building are fixed to the upper end of the vertical beam 76 by fixing means such as a nail (not shown). On the other hand, the horizontal beam 78 on the lower side of the building has both ends fixed to the lower end of the vertical beam 76 by fixing means such as a nail (not shown).

  The inner wall frame 72 having the above configuration is fastened to the ceiling of the building 10 by tapping screws (not shown) from the lower side of the building to the side beam 78 on the upper side of the building. Yes. On the other hand, the building lower side of the inner wall frame 72 is fixed to the floor portion 82 of the building 10 as described later. An inner wall material 74 is attached to the inner wall frame 72 from the indoor side by attachment means such as a nail (not shown), and an inner wall cloth for inner wall finishing (not shown) is stretched on the inner wall material 74. Further, on the outdoor side of the inner wall frame 72, an inner heat insulating material 80 made of XPS and configured in a rectangular plate shape is disposed. The inner heat insulating material 80 is disposed between the inner wall frame 72 and the outer heat insulating material 66 and is attached to the inner wall frame 72 and the outer heat insulating material 66 with an adhesive (not shown).

  Here, in this embodiment, as an example, the building 10 is a semi-fireproof building that can be built in a semi-fire-proof area, and the floor portion 82 of the building 10 includes a joist 84 and floor boards 86 and 88. It is set as the structure corresponding to a semi-fireproof structure. Hereinafter, the structure of the floor part 82 which comprises the principal part of the heat insulation fireproof structure of the building 10 which concerns on this embodiment is demonstrated in detail.

  First, the configuration of the joist 84 will be described with reference to FIGS. 1 and 2. The joist 84 is composed of a plurality of types of joists having different dimensions in the building height direction. In the present embodiment, the joist 84 is configured to include a first joist 90 and a second joist 92 as an example. . The first joist 90 faces the upper side of the building and extends in the longitudinal direction of the floor beam 34 (longitudinal direction of the building unit 14), and the outer and indoor peripheral edges of the upper wall portion 90A. And a pair of side wall portions 90B extending from the portion to the building lower side, and made of steel. That is, the first joist 90 is formed by bending a flat steel material into a U-shape with the lower side of the building open in a longitudinal sectional view. In the present embodiment, the building height of the first joist 90 is taken as an example. The vertical dimension is set to about half of the interval between the side wall portions 90B.

  The second joist 92 includes the upper wall portion 92A and the side wall portion 92B and is made of steel, like the first joist 90, but is made of steel. The dimensions are different. Specifically, in the present embodiment, as an example, the building height direction dimension of the second joists 92 is approximately the same as the interval between the side wall portions 92B. In other words, the building height of the second joists 92 is as follows. The vertical dimension is about twice the dimension of the first joist 90 in the building height direction. The first joist 90 and the second joist 92 configured as described above are joined to each other by joining means such as welding, and the end portions of the side wall portions 90B and 92B are welded to the upper surface of the upper flange portion 34A of the floor beam 34. It is fixed by being joined by the joining means. Furthermore, the joist 84 is made of a steel material, that is, a non-combustible material, and therefore has a non-combustibility higher than that of the semi-combustible material. In addition, "having nonflammability more than a semi-incombustible material" here means that it is composed of a non-combustible material or a semi-incombustible material.

  On the other hand, the floor boards 86 and 88 are each formed in a rectangular plate shape, the floor board 86 on the upper wall 90A of the first joist 90, and the floor board 88 on the upper wall 92A of the second joist 92, respectively. A predetermined number is laid along the longitudinal direction of the building unit 14. In other words, the joist 84 is in a state of being interposed between the upper flange portion 34 </ b> A of the floor girder 34 and the floor board materials 86 and 88. Further, the floor board materials 86 and 88 are configured such that a finishing surface 86A constituted by the floor board material 86 and a finishing surface 88A constituted by the floor board material 88 are arranged on the same plane. That is, the floor board material 86 and the floor board material 88 are set to have different plate thicknesses. Specifically, the board thickness of the floor board material 88 supported by the second joists 92 is supported by the first joists 90. It is set smaller than the thickness of the floor board 86. The second joists 92 and the floor board material 88 are disposed at places where the proof stress is not required in the floor portion 82, while the first joists 90 and the floor board material 86 are required proof strength in the floor portion 82. It is arranged at the place. Further, the floor boards 86 and 88 are fastened to the joists 84 together with the horizontal rails 78 by driving the tapping screws 94 from the upper side of the horizontal rails 78 on the lower side of the building of the inner wall frame 72. A flooring 96 (floor finishing material) is laid on the finished surfaces 86A and 88A of the floor board materials 86 and 88.

  In the present embodiment, the joist 84 and the floor board materials 86 and 88 are configured as described above, so that the height of the joist 84 in the building height direction is maintained while maintaining the height of the floor surface 82A of the floor portion 82. It is possible to change the thickness of the floor boards 86 and 88. Furthermore, the floor board materials 86 and 88 are made of a wood-based cement board which is a semi-incombustible material, and can correspond to a semi-fire resistant structure. In addition, the thickness of the floor board | plate materials 86 and 88 can be changed in the range which can respond to a semi-fireproof structure.

  Moreover, in the joist 84 of the said structure, compared with the case where the joist 84 is comprised with quasi-incombustible materials, such as a wood-type cement board, it is efficient with respect to the external dimension and cross-sectional area of the vertical cross section of the joist 84. It becomes possible to ensure bending rigidity. This makes it possible to secure a space 98 on the outdoor side of the joist 84 in the upper flange portion 34 </ b> A of the floor beam 34, and the lower portion 80 </ b> A of the inner heat insulating material 80 is disposed in the space 98. That is, the outdoor side wall portion 90 </ b> B of the first joist 90 and the outdoor side wall portion 92 </ b> B of the second joist 92 are covered with the inner heat insulating material 80. The configuration of the floor portion on the second floor of the building 10 is the same as the configuration of the floor portion 82.

  Moreover, the space 98 is also used for arrangement | positioning of the stud 102 which reinforces the housing frame 22, as FIG.3 and FIG.4 shows. More specifically, in the present embodiment, a plurality of building units constituting the lower floor side of the building 10 are removed from the lower floor of the building 10 by removing the pillars 24 arranged at the indoor central portion of the respective frame frames 22. A large space (not shown) is formed on the side. In the present embodiment, as an example, the studs 102 are disposed between the outer wall frame 46 and the outer wall frame 100 constituting the outer wall panel 40. Although the outer wall frame 100 is basically configured in the same manner as the outer wall frame 46, the length of a horizontal beam (not shown) constituting the outer wall frame 100 is shorter than the length of the horizontal beams 54 and 56. It is set to length. In other words, the outer wall frame 100 is narrower than the outer wall frame 46. Correspondingly, the outer heat insulating material 108 made of XPS disposed inside the outer wall frame 100 is also narrower than the outer heat insulating material 66.

  Next, the structure of the stud 102 will be described in detail. The stud 102 includes a lower mounting portion 104 attached to the floor beam 34, a main body portion 106 formed of a square pipe extending in the building height direction, and an upper mounting portion (not shown) attached to the ceiling beam 30. And is made of steel.

  The lower attachment portion 104 includes a main body side wall portion 104A joined to the lower end portion of the main body portion 106, and an attachment wall portion 104B extending from the outdoor peripheral edge portion of the main body portion side wall portion 104A to the building lower side. The vertical cross-sectional shape is L-shaped. More specifically, the main body side wall portion 104A is disposed along the upper flange portion 34A of the floor girder 34, and the mounting wall portion 104B is disposed along the web portion 34B of the floor girder 34. Further, insertion holes (not shown) are formed at two locations in the longitudinal direction of the building unit 14 in the mounting wall portion 104B. On the other hand, on the indoor side surface of the web portion 34B of the floor beam 34, the insertion holes are not provided. A corresponding weld nut 110 is provided. Then, the bolt 118 is inserted from the outdoor side of the mounting wall portion 104B into the insertion hole of the mounting wall portion 104B and screwed into the weld nut 110, so that the lower mounting portion 104 is attached to the floor beam 34. ing.

  On the other hand, the upper mounting portion has the same configuration as the lower mounting portion 104. Specifically, the upper attachment portion is disposed along the attachment wall portion disposed along the web portion 30 </ b> A of the ceiling beam 30 and the lower flange portion 30 </ b> B of the ceiling beam 30 and the upper end portion of the main body portion 106. And a main body side wall portion joined to the main body. Then, the upper mounting portion is attached to the ceiling beam 30 by attaching the mounting wall portion of the upper mounting portion to the web portion 30A of the ceiling beam 30 at a plurality of locations from the outdoor side by mounting means such as tapping screws. Yes.

  The main body portion 106 has a rectangular frame shape, more specifically, a square frame shape in a plan view, and when viewed from the building height direction, about half of the outdoor side is the web portion 34B of the floor beam 34 and the ceiling beam 30. It protrudes from the web portion 30A to the outdoor side. The width of the main body portion 106 (the length in the longitudinal direction of the building unit 14) is set to about half of the length in the longitudinal direction of the building unit 14 of the upper mounting portion and the lower mounting portion 104. The upper end portion of the main body portion 106 is disposed at the center in the longitudinal direction of the main body portion side wall portion of the upper attachment portion, and the lower end portion of the main body portion 106 is disposed on the main body side wall portion 104A of the lower attachment portion 104. It is arrange | positioned in the longitudinal direction center part. It should be noted that a joining means such as welding is used for joining the main body portion 106 to the upper attachment portion and the lower attachment portion 104.

  In the state where the stud 102 configured as described above is attached to the frame 22, the main body portion 106 is arranged on the floor beam 34 and the ceiling beam 30 arranged facing the floor beam 34 in the building height direction. It is laid over. The main body portion 106 of the stud 102 is in contact with the vertical beam 50 of the outer wall frame 46 and the vertical beam 52 of the outer wall frame 100. In addition, by arranging the studs 102 as described above, the inner heat insulating material 80 is partitioned by the main body portion 106 of the studs 102. The outer wall material 112 constituting the outer wall panel 40 is set wider than the outer wall material 48.

  Moreover, the arrangement | positioning location and number of the studs 102 are not restricted to the above, but are suitably arranged at a location where the frame frame 22 needs to be reinforced. In addition, the studs 102 are not limited to a case where a large space is configured by a plurality of building units, but are appropriately arranged at places where reinforcement is required even when the span length of the beams of the building units is long.

  Further, XPS outer heat insulating materials 114 are respectively disposed at the positions where the studs 102 are disposed in the web portion 34B of the floor beam 34 and the web portion 30A of the ceiling beam 30. The outer heat insulating material 114 has the length in the longitudinal direction of the building unit 14 approximately the same as the width of the main body portion 106 of the stud 102, and the length in the building height direction is the web portion 34B and the web portion 30A. It is about the same as the length in the building height direction. And the outer side heat insulating material 114 is affixed on the surface by the side of the web part 34B and the web part 30A, respectively, and has covered the outdoor side of the web part 34B and the web part 30A.

  On the other hand, on the outdoor side of the body portion 106 of the stud 102, a stud heat insulator 116 made of XPS and configured in a rectangular flat plate shape is disposed. The width of the interstitial insulator 116 is set to be approximately the same as the width of the main body 106, and the length in the building height direction is approximately the same as the length of the main body 106 in the building height direction. In addition, the side wall portion 106 </ b> A on the outdoor side of the main body portion 106 is covered with the inter-column heat insulating material 116. In addition, the lower end portion of the inter-column heat insulating material 116 is in contact with the outer heat insulating material 114, in other words, the inter-column heat insulating material 116 is disposed continuously with the outer heat insulating material 114.

<Operation and effect of this embodiment>
Next, the operation and effect of this embodiment will be described.

  In this embodiment, the floor girder 34 includes an upper flange portion 34A facing the building upper side, and a web portion 34B extending from the outdoor peripheral edge of the upper flange portion 34A to the building lower side. Has been. A plurality of floor board materials 86 and 88 having incombustibility equal to or higher than the semi-incombustible material are laid along the longitudinal direction of the floor beam 34 on the upper side of the upper flange portion 34A of the floor beam 34A. Part 82 is configured. Further, the floor boards 86 and 88 are supported by joists 84 interposed between the upper flange portions 34A of the floor beams 34 and the floor boards 86 and 88, and the joists 84 are more incombustible than quasi-incombustible materials. have. For this reason, the fireproof performance of the floor part 82 of the building 10 can be ensured. On the other hand, the outdoor side of the web portion 34 </ b> B of the floor beam 34 is covered with outer heat insulating materials 66, 108 and 114. Thereby, the thermal bridge by the floor girder 34 can be suppressed.

  By the way, in the floor board material 86,88 comprised with the material which has nonflammability more than a quasi-incombustible material and the said floor board material 86,88 and the wooden floor board material of the same shape, the floor board material 86,88 becomes heavier. For this reason, if the floor board materials 86 and 88 are made of a material having incombustibility equal to or higher than that of the semi-incombustible material while maintaining the shape of the floor board materials 86 and 88, the weight of the floor portion 82 of the building 10 increases, during an earthquake, etc. The inertial force generated on each floor increases. Therefore, when securing the fire resistance of the floor portion 82 of the building 10, it is preferable to take measures against an increase in the weight of the floor portion 82.

  Here, in this embodiment, it has the 1st joist 90 and the 2nd joist 92 from which the dimension of a building height direction differs, and the height of floor surface 82A of the floor part 82 comprised by the floor board materials 86 and 88. FIG. The thickness of the floor board materials 86 and 88 can be changed according to the dimension of the first joist 90 and the second joist 92 in the building height direction. For this reason, in this embodiment, the thickness of the floor board materials 86 and 88 can be adjusted according to the proof stress required for each location of the floor portion 82. As a result, in the location where the proof strength in the floor portion 82 is not required. By reducing the thickness of the floor board material 88, an increase in the weight of the floor portion 82 can be suppressed. Therefore, in this embodiment, it is possible to achieve both heat insulation performance and fire resistance performance of the floor portion 82.

  Further, in the present embodiment, the first joists 90 and the second joists 92 are respectively formed from the upper wall portion extending in the longitudinal direction of the floor beam 34 and the peripheral portions on the outdoor side and indoor side of the upper wall portion. It is made of steel and includes a pair of side wall portions extending to the building lower side. For this reason, the nonflammable performance of the joist 84 can be improved as compared with the case where the joist 84 is made of a semi-incombustible material such as a wood cement board.

  However, when the joist 84 is made of steel, it is considered that a thermal bridge is generated by the joist 84. Here, in the present embodiment, the joist 84 is configured as described above, so that the joist 84 is efficiently made with respect to the outer dimensions and cross-sectional area of the vertical cross section of the joist 84 compared to the case where the joist 84 is made of a semi-incombustible material. The bending rigidity of 84 can be ensured. For this reason, the space | interval of the side wall part of the joist 84 can be narrowed, and the space 98 can be ensured on the outdoor side of the joist 84 in the upper side flange part 34A of the floor beam 34. As a result, by arranging the inner heat insulating material 80 in the outdoor space 98 of the joist 84 and covering the outdoor side wall portion of the joist 84 with the inner heat insulating material 80, it is possible to prevent the joist 84 from generating a thermal bridge. can do. Therefore, in the present embodiment, it is possible to improve the fire resistance performance of the floor portion of the building and improve the design freedom of the peripheral portion of the joists while ensuring the heat insulating performance of the floor portion.

  Furthermore, in this embodiment, the building 10 is composed of a plurality of building units, and the building unit frame 22 is a floor girder 34 and the ceiling girder 30 arranged facing the floor girder 34 in the building height direction. It is comprised including. In the building unit 14 constituting the lower floor side of the building 10, the studs 102 are arranged in the outdoor space 98 of the joist 84 in the upper flange portion 34 </ b> A of the floor beam 34. It spans the ceiling beam 30. For this reason, the ceiling girder 30 and the floor girder 34 on the lower floor side are reinforced. As a result, even if the span length of the beam of the building unit 14 constituting the lower floor side is increased or a large space is formed by partially removing the pillars 24 of the plurality of building units on the lower floor side, the ceiling beam 30 And it can suppress that the bending which generate | occur | produces in the floor large beam 34 becomes large.

  Moreover, in this embodiment, although the inner side heat insulating material 80 is partitioned off by the said stud 102 by arrange | positioning the stud 102 as mentioned above, while the outdoor side of the stud 102 is covered with the stud thermal insulator 116, the said stud thermal insulator 116 is continuously arranged with the outer heat insulating material 114. For this reason, the heat insulation layer (heat insulation line) extended in the building height direction can be ensured on the outdoor side of the stud 102. Therefore, in this embodiment, the heat insulation of the building 10 can be ensured while supporting various housing plans.

  In addition, in the present embodiment, the joist 84 is welded to the upper flange portion 34A of the floor girder 34, so that the joist 84 is positioned on the upper flange portion 34A, and the floor planks 86, 88 are placed on the joist 84. Can be arranged. As a result, in this embodiment, it is possible to simplify the work of attaching the floor board materials 86 and 88 to the joists 84.

  In addition, in this embodiment, since the floor board materials 86 and 88 are made of wood-based cement boards, the floor portion 82 is made as compared with the case where the floor board materials 86 and 88 are made of lightweight cellular concrete (ALC). The weight can be reduced. As a result, in this embodiment, the inertial force generated on each floor during an earthquake or the like can be reduced as compared with the case where the floor board materials 86 and 88 are made of lightweight cellular concrete.

Second Embodiment
Next, the structure of the floor part 130 to which the heat insulation fireproof structure of the building which concerns on 2nd Embodiment of this invention is applied is demonstrated using FIG.8 and FIG.9. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted. This embodiment is a reference example.

  As shown in FIGS. 8 and 9, the present embodiment is characterized in that the joists 132 are made of a wood cement board. More specifically, the joist 132 includes a first joist 134 that has a prism shape extending in the longitudinal direction of the building unit 14 and an angle that extends in the longitudinal direction of the building unit 14 in the same manner as the first joist 134. And a second joist 136 having a columnar shape. More specifically, the longitudinal cross-sectional shape of the first joist 134 is set so that the dimension in the building height direction is about half of the dimension in the direction orthogonal to the building height direction. On the other hand, the vertical cross-sectional shape of the second joist 136 is set so that the dimension in the building height direction is approximately the same as the dimension in the direction orthogonal to the building height direction. For this reason, also in this embodiment, it is possible to change the thickness of the floor board materials 86 and 88 according to the dimension of the joist 132 in the building height direction while maintaining the height of the floor surface 130A of the floor portion 130. It has become.

  Further, in the present embodiment, the joists 132 and the floor board materials 86 and 88 and the horizontal rail 78 on the lower side of the building of the inner wall frame 72 are separately attached. Specifically, the joist 132 and the floor boards 86 and 88 are fastened to the upper flange portion 34 </ b> A of the floor girder 34 by the tapping screw 94 being driven in from the building upper side of the joist 132. Although not shown, in this embodiment, the crosspiece 78 on the lower side of the building of the inner wall frame 72 is a place different from the place where the joist 132 is attached, and the treading screw 94 together with the floor board members 86 and 88 is used as the joist. It is fastened to 132.

<Operation and effect of this embodiment>
Next, the operation and effect of this embodiment will be described.

  In the present embodiment, except that the joist 132 is made of a wood cement board, the structure is the same as that of the first embodiment described above, so that the joist 84 is made of steel, Except for the effects, the same operations and effects as those of the first embodiment described above are exhibited. The joist 132 is made of a wood-based cement board, but the floor portion 130 according to the present embodiment is also compatible with the semi-fire resistant structure as long as the fire prevention performance that can be applied to the semi-fire resistant structure is satisfied in the fire prevention test. Is possible.

  In the present embodiment, since the joists 132 are made of a wood cement board, a space can be secured on the upper flange portion 34A of the floor beam 34 by cutting the joists 132 or the like. For this reason, the spacer 102 etc. can be additionally arranged on the upper flange portion 34 </ b> A of the floor girder 34. Therefore, in this embodiment, it is possible to flexibly cope with a change in the house plan while ensuring the fire resistance of the building 10. Furthermore, since the joist 132 can be additionally processed locally, the degree of freedom in the construction process can be improved.

<Supplementary explanation of the above embodiment>
(1) In the above-described embodiment, the floor board materials 86 and 88 are made of wood-based cement boards, but the floor board materials 86 and 88 may be made of a concrete member such as a lightweight cellular concrete which is a non-combustible material. Moreover, although the weight of the floor board materials 86 and 88 becomes heavy by setting it as such a structure, the floor part 82 respond | corresponds to a fireproof structure by setting the thickness of the floor board materials 86 and 88 to predetermined thickness. It is also possible to adopt the configuration described above. In the above-described embodiment, it is assumed that the building 10 is built in the semi-fire prevention area. However, the building 10 can be built in the fire prevention area by satisfying a predetermined number of floors, a floor area, and the like.

  (2) In the above-described embodiment, the joists are configured to include the first joists and the second joists having different dimensions in the building height direction, but the present invention is not limited thereto. In other words, joists are two or more types of joists that have different dimensions in the building height direction in consideration of the proof stress required for each part of the floor and the inertial force generated at each floor during an earthquake. It may be configured.

  (3) Further, in the first embodiment described above, the joists 84 are welded to the floor beams 34, but, like the joists 132 of the second embodiment, they are fastened to the upper flange portions 34A of the floor beams 34 with tapping screws. It is good also as a structure to be made.

10 Building 14 Building Unit 16 Building Unit 18 Building Unit 20 Building Unit 22 Housing Frame
30 Ceiling girder 34 Floor girder 34A Upper flange (flange)
34B Web part 66 Outer heat insulating material 80 Inner heat insulating material 82 Floor part 84 joist 86 Floor board material 88 Floor board material 90 First joist (joe)
90A Upper wall portion 90B Side wall portion 92 Second joist (josh)
92A Upper wall part 92B Side wall part 102 Intermediary pillar 108 Outer insulation material 114 Outer insulation material 116 Intermediary pillar insulation material 130 Floor part 132 joist 134 First joist (joe)
136 Second joist (Jewel)

Claims (5)

A floor girder configured to include a flange portion facing the building upper side, and a web portion extending from the peripheral edge portion on the outdoor side of the flange portion to the building lower side,
A plurality of sheets are laid along the longitudinal direction of the floor beam on the building upper side of the flange portion to constitute the floor portion of the building, and a floor board material having non-combustibility more than a semi-incombustible material,
An outer heat insulating material covering the outdoor side of the web portion;
A plurality of types of joists that are interposed between the flange portion and the floor board material, support the floor board material, have non-flammability more than a semi-incombustible material, and have different dimensions in the building height direction,
Have a,
The joist includes an upper wall portion extending in the longitudinal direction of the floor beam, and a pair of side wall portions extending from the outer peripheral side and the indoor side of the upper wall portion to the building lower side. It is configured to be made of steel, and the end of the side wall is in contact with the flange.
Insulating fireproof structure of buildings. Further comprising an inner heat insulating material covering the side wall portion of the outdoor side of the front Symbol joists,
The heat insulation fireproof structure of the building of Claim 1. The building is composed of a plurality of building units, and the frame of the building unit includes the floor beam, the ceiling beam and the ceiling beam arranged facing the building height direction,
Further, a pillar that is spanned between the floor beam and the ceiling beam of the building unit that constitutes the lower floor side of the building and is arranged on the outdoor side of the joist in the flange portion, and partitions the inner heat insulating material, A spacer insulation covering the outdoor side of the stud, and
The inter-column heat insulating material is disposed continuously with the outer heat insulating material,
The heat insulation fireproof structure of the building of Claim 2. The joist is welded to the flange portion,
The heat insulation fireproof structure of the building of Claim 2 or Claim 3. The floor board material is composed of a wood-based cement board,
The heat insulation fireproof structure of the building of any one of Claims 1-4 .

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