JP2010126946A - Underfloor structure of building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underfloor structure which does not greatly deteriorate underfloor ventilation performance in a building with a parting wall. <P>SOLUTION: The parting wall 30 for partitioning a plurality of dwelling units is provided on a floor surface material 28A above a floor girder 23A in a first-story section of a unit building. An underfloor partition wall 150 as an inhibition portion is provided along the longitudinal direction of the floor girder 23A in the first-story section 12, that is, in a direction parallel to the floor girder 23A, below the floor girder 23A, that is, in a position directly below the parting wall 30, in the underfloor space 15 of the building 10. A gap CL1 for permitting the circulation of air in the underfloor space 15 is formed between the floor girder 23A and the underfloor partition wall 150. The gap CL1 is formed in such a shape as to inhibit the passage of a person and have gap dimensions D1 effective for underfloor ventilation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an underfloor structure of a building having a boundary wall.

In collective housing, it is required to install a boundary wall between the dwelling units. The boundary wall is for ensuring fire prevention performance that suppresses the spread of fire between the dwelling units, soundproof performance that suppresses sound leakage between the dwelling units, crime prevention performance that suppresses intrusion of people between the dwelling units, and the like. Here, it is common that the conventional wall is raised from the cloth foundation (for example, refer to Patent Document 1).
JP 2001-214522 A

  However, if the structure is such that the boundary wall is raised from the fabric foundation, the ventilation performance under the floor will be significantly reduced. This is because the air flow is obstructed by the boundary wall portion under the floor. When the ventilation performance under the floor is low, there is a concern that the deterioration performance of the building may be affected.

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide an underfloor structure that does not significantly lower the underfloor ventilation performance in a building having a boundary wall.

  In order to solve the above-mentioned problem, the first invention is an underfloor structure of a building in which a boundary wall for partitioning the first dwelling unit and the second dwelling unit is provided. In addition, there is provided a blocking portion that blocks movement of a person under the floor between the second dwelling unit and allows air to flow under the floor between the first and second dwelling units.

  In a building having a boundary wall, since the boundary wall is generally formed even under the floor, the ventilation performance under the floor is hindered by the boundary wall. Here, the present inventor, based on a new viewpoint that fire prevention performance is not necessary in the underfloor space facing the ground (ground surface) from the viewpoint of preventing the spread of fire between the dwelling units, the first and first sandwiching the boundary wall under the floor It reached | attained the point which comprises the prevention part which permits the distribution | circulation of the air under the floor between the 1st and 2nd dwelling units, while providing the prevention part which prevents the movement of the person under the floor between 2 dwelling units. And according to this composition of the present invention, while the act which penetrates into the 2nd dwelling unit from the 1st dwelling unit under the floor is controlled, the ventilation performance under the floor is more than before, maintaining fire prevention performance. The advantage is that it is significantly improved.

  According to a second invention, in the first invention, the blocking portion is provided directly below the boundary wall.

  In the first aspect of the invention, any blocking unit may be used as long as it can prevent people from coming and going, so the blocking unit does not necessarily have to be provided directly under the boundary wall. However, if it is not directly under the boundary wall, the blocking part must be set so as to prevent people from coming and going in anticipation of the offset between the blocking part and the boundary wall in plan view. It is envisaged that there are many points to consider. In this respect, according to the present invention, consideration for the offset is not necessary, which is advantageous from the viewpoint of design and construction.

  According to a third invention, in the first or second invention, the blocking portion is a rising portion that protrudes upward from the ground and extends along the boundary wall, and an upper end portion of the rising portion and a floor constituent material A gap is formed between the two.

  The blocking part can be configured as a rising part protruding upward from the ground. Further, in the present invention, air can be allowed to flow by a simple configuration in which a gap is provided between the upper end portion of the rising portion and the floor constituent material (floor beam, floor surface material, etc.).

  Thus, the configuration using the gap not only provides a configuration that allows air flow, but also provides the following advantages.

  In other words, because of the nature of the prevention part that exists from the viewpoint of crime prevention that prevents people from coming and going, it is desirable that the prevention part is robust, but if the prevention part itself tries to secure air circulation, it will be blocked. It is necessary to form a through hole in the portion, and it is necessary to compensate for the strength reduction due to the through hole with the reinforcing material. In this regard, according to the present invention, since the gap with the floor constituent material is used, there is an advantage that excessive reinforcement is not necessary.

  In addition, in a configuration where there is no gap between the rising part and the floor component (conventional structure), the height must be set so that the height of the underfloor wall fits exactly under the floor. However, in the present invention, since there is a gap that allows air to flow while preventing human movement, the height accuracy of the rising portion may be considerably low. As a result, the required accuracy level in each process of design, production and construction is lowered.

  In a fourth aspect based on the third aspect, the building is a unit type building configured by combining a plurality of building units, and each building unit includes a plurality of columns and a ceiling connected to the top and bottom thereof. A beam and a floor beam are provided, and the gap is formed between the floor beam and the rising portion.

  When the skeleton of the building unit is formed by columns, ceiling beams, and floor beams, the floor beams are exposed below the floor surface material under the floor. Therefore, in such a unit type building, it is advantageous in terms of design and construction to form a gap between the floor beam and the rising portion. As for the gap between the floor beam and the rising portion, it is not necessary to pay attention only to the gap seen in the vertical direction. That is, the upper end of the rising portion may be above the lower end of the floor beam, and even in this case, this can be realized if the floor beam and the rising portion are offset in plan view.

  According to a fifth invention, in the first or second invention, the blocking portion is a hanging portion that protrudes downward from the floor constituent material and extends along the boundary wall, and a lower end portion of the hanging portion is separated from the ground. It is separated.

  The blocking portion can be configured as a hanging portion that protrudes downward from the lower surface of the floor. Further, in the present invention, air can be allowed to flow by a simple configuration in which a gap is provided between the lower end portion of the hanging portion and the ground.

  Thus, the configuration using the gap not only provides a configuration that allows air flow, but also provides the following advantages.

  In other words, because of the nature of the prevention part that exists from the viewpoint of crime prevention that prevents people from coming and going, it is desirable that the prevention part is robust, but if the prevention part itself tries to secure air circulation, it will be blocked. It is necessary to form a through hole in the portion, and it is necessary to compensate for the strength reduction due to the through hole with the reinforcing material. In this regard, according to the present invention, since a gap with the ground is used, there is an advantage that excessive reinforcement is not necessary.

  Further, in the conventional structure, there was a problem that the height of the lower floor wall had to be set so that the height of the lower floor wall closely fits between the floor constituent material and the ground. However, in the present invention, human movement is prevented. However, since there is a gap that allows air flow, the height accuracy of the hanging portion may be considerably low. As a result, the required accuracy level in each process of design, production and construction is lowered.

  Furthermore, in the present invention, since a rising portion such as a foundation is not provided as in the prior art, but a hanging portion is provided on the building side, consideration for the boundary wall becomes unnecessary when the foundation is constructed.

  In a sixth aspect based on the fifth aspect, the building is a unit type building configured by combining a plurality of building units, and each of the building units includes a plurality of columns and a ceiling connected to the top and bottom thereof. A beam and a floor beam are provided, and the hanging portion is connected to the floor beam.

  When the skeleton of the building unit is formed by columns, ceiling beams, and floor beams, the floor beams are exposed below the floor surface material under the floor. Therefore, in such a unit type building, by connecting the hanging part to the floor beam, the hanging part can be provided in the building unit without affecting the indoor environment.

  In addition, since the hanging part will protrude greatly downward from the building unit, if the hanging part is provided so as to be foldable along the floor beam or connected to the floor beam during construction on site, it will be The hanging part does not get in the way in the manufacturing process and the conveying process. Here, when building units are arranged side by side at a construction site, a process of installing one building unit instead of installing a building unit at a time and then installing an adjacent building unit is common. . Therefore, when one building unit is installed, a hanging part is constructed on a part of the building by deploying the hanging part from the floor beam of the installed building unit or connecting the hanging part to the floor beam. Then, if the construction sequence is to install the adjacent building unit, the site construction can be performed efficiently.

  According to a seventh invention, in any one of the first to sixth inventions, the blocking portion is set to allow passage of piping and wiring in addition to the circulation of the air. To do.

  According to the seventh invention, in a building provided with a boundary wall that partitions a plurality of dwelling units, in addition to improving the underfloor ventilation performance, piping and wiring can be further passed under the floor so as to straddle each dwelling unit. Thereby, the freedom degree of wiring and piping is raised.

  An eighth invention is characterized in that, in any one of the first to seventh inventions, the blocking portion is a plurality of wall portions extending along the boundary wall and disposed at a predetermined interval. To do.

  According to the eighth aspect of the present invention, a gap is formed between adjacent wall portions of the plurality of wall portions constituting the blocking portion, so that this can be used for air circulation or for piping and wiring. It can be used for a penetration part. It is also possible to share roles such that the gaps in the third and fifth inventions are exclusively used for air circulation, and the gaps between the wall portions are mainly used as piping and wiring passages.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings. In the present embodiment, the building is embodied as an apartment house in which a plurality of dwelling units are assembled to form one building, and in particular, the building is a two-story unit type building constructed by a steel frame unit construction method. . FIG. 1 is a front view showing a schematic configuration of a building 10 in the present embodiment, and FIG. 2 is a plan view showing an arrangement of building units 20 constituting the building 10.

  As shown in FIG. 1, a building 10 includes a first floor portion 12 as a lower floor portion provided on a foundation 11, and a second floor portion as an upper floor portion provided adjacent to the upper portion of the first floor portion 12. 13 and a roof portion 14 provided above the second floor portion 13. The foundation 11 is composed of a cloth foundation, and is continuously provided at a site surrounding at least the outer edge of the building 10. And the building unit 20 of the first floor part 12 is installed on the upper surface of the rising part of the foundation 11. Below the building 10, an underfloor space 15 is formed so as to be surrounded by the foundation 11.

  In the present embodiment, as shown in FIG. 2, the first floor portion 12 and the second floor portion 13 are both constructed by six building units 20, and four building units 20 are arranged on the same floor. Two dwelling units A1, A2, A3, A4 are formed. The number of units and the number of dwelling units on each floor are arbitrary, and a plurality of dwelling units may be formed by the plurality of building units 20.

  Between each adjacent dwelling unit A1-A4 (boundary part), the boundary walls 30 and 40 as a door boundary wall are provided. Here, the boundary wall 30 separates between the dwelling unit A1 and the dwelling unit A2 and between the dwelling unit A3 and the dwelling unit A4, and is along the docking line DL (unit boundary line) between the building units 20. In other words, the boundary wall 40 is provided between the dwelling unit A1 and the dwelling unit A3 and between the dwelling unit A2 and the dwelling unit A4. It is not along the (unit boundary line), that is, provided at a position different from the docking line DL. In addition, in FIG. 2, although it seems that the boundary wall 30 is provided in the clearance gap between each unit, this only shows the boundary wall installation place in the whole building, and details, such as an installation place, are shown. Will be described later.

  As shown in FIG. 1, the boundary walls 30 and 40 extend in the vertical direction from the floor surface of the first floor portion 12 to the field plate of the roof portion 14. Fireproof performance and soundproof performance are ensured.

  Next, the structure of the building unit 20 is demonstrated using FIG. The building unit 20 includes four columns 21 disposed at the four corners thereof, and four ceiling beams 22 and floor beams 23 that respectively connect the upper end and the lower end of each column 21. A rectangular frame (frame) is formed by the pillars 21, the ceiling beams 22 and the floor beams 23. The column 21 is made of a square tube-shaped square steel. Moreover, the ceiling beam 22 and the floor beam 23 are made of channel steel having a U-shaped cross section, and are installed so that the openings thereof face each other. Supplementing the ceiling beam 22 and the floor beam 23, these include a web whose plate surface extends in the vertical direction and a pair of flanges extending laterally from the upper and lower ends of the web, and the web surrounded by the web and the flange. It is comprised by the groove type steel in which the groove part opened in the side used as the opposite side was formed.

  A plurality of ceiling beams 25 are bridged and fixed between the large ceiling beams 22 of the long side portion (girder portion) of the building unit 20 facing each other. Similarly, a plurality of floor beams 26 are bridged and fixed at predetermined intervals between the large floor beams 23 of the long side portion (girder portion) of the building unit 20 facing each other. The ceiling beam 25 and the floor beam 26 are provided horizontally on the ceiling beam 22 and the floor beam 23 on the short side (wife side) at the same interval. For example, the ceiling beam 25 is made of lip groove steel, and the floor beam 26 is made of square steel. The ceiling member 27 is supported by the ceiling beam 25 and the floor member 28 is supported by the floor beam 26. Each building unit 20 used in the building 10 is manufactured in advance in a factory and then transported to a building site by a truck or the like.

  Next, the building structures of the boundary walls 30 and 40 and their peripheral parts will be described in detail. In the present embodiment, the boundary wall 30 provided at the same position as the docking line DL of the building unit 20 and the boundary wall 40 provided at a position different from the docking line DL of the building unit 20 have different configurations. 4 shows a cross-sectional configuration of the boundary wall 30 and its peripheral portion, and FIG. 5 shows a cross-sectional configuration of the boundary wall 40 and its peripheral portion. 4 is an X1-X1 cross-sectional view in FIG. 2, and FIG. 5 is an X2-X2 cross-sectional view in FIG. 4 and 5, for convenience of explanation, each component of the building unit 20 in the first floor portion 12 is represented by a ceiling beam 22A, a floor beam 23A, a ceiling beam 25A, a floor beam 26A, a ceiling surface material 27A, respectively. The floor surface material 28A is used, and the constituent elements of the building unit 20 in the second-floor portion 13 are a ceiling beam 22B, a floor beam 23B, a ceiling beam 25B, a floor beam 26B, a ceiling surface 27B, and a floor material 28B, respectively. 4 and 5 show the boundary line between the upper floor unit and the lower floor unit as a stacking line SL.

  Here, the detailed configuration of the building unit 20 will be described prior to the description of the boundary walls 30 and 40. First, the detailed configuration of the first floor portion 12 will be described.

  As shown in FIG. 4, a floor joist 51 (a joist upper joist) that supports the floor material 28A (floor material) from below is provided on the large floor beam 23A of the first floor portion 12 (specifically, on the upper flange). The floor material 28A is fixed on the floor joist 51 with screws, nails or the like. The floor material 28A is made of, for example, a particle board (plywood). Further, a floor connecting material 52 is provided between the two left and right floor members 28A provided on two adjacent floor beams 23A to form a floor surface flush with the floor member 28A (same height). It has been. The floor connecting material 52 is formed of the same material as the floor surface material 28A, and is fixed to the floor joist 51 with screws, nails or the like. An underfloor heat insulating material 53 is provided on the lower surface side of the floor surface material 28 </ b> A and the floor connecting material 52. Further, in the portion where the floor beam 26A is provided, as shown in FIG. 5, a floor joist 54 (beam joist) is provided on the floor beam 26A, and the floor material 28A is provided on the floor joist 54. Is fixed with screws or nails. The floor material 28A can be directly fixed to the floor beam 26A with screws, nails or the like.

  A field edge 55 (large beam field edge) is fixed to the ceiling large beam 22A (specifically, the lower flange) of the first floor portion 12 with screws or nails, and a ceiling surface member 27A is screwed to the lower surface of the field edge 55. It is fixed with nails. The ceiling surface material 27A is configured, for example, by stacking two plaster boards. In addition, a ceiling connecting member 56 that forms a ceiling surface that is flush with (same height as) the ceiling surface material 27A is provided between the two left and right ceiling surface materials 27A provided on the two adjacent ceiling beams 22A. ing. The ceiling connecting material 56 is formed of the same material as the ceiling surface material 27A, and is fixed to the field edge 55 with screws, nails, or the like. Further, in the portion where the ceiling beam 25A is provided, as shown in FIG. 5, the ceiling face material 27A is fixed to the ceiling beam 25A together with the field edge 57 (field edge for the beam) with screws, nails or the like. Has been.

  Note that the floor connecting material 52 and the ceiling connecting material 56 are assembled so as to fill the gaps between the floor portions and the ceiling portions between the units 20 after the installation of the building units 20 at the construction site.

  Next, the configuration of the second floor portion 13 will be described. A second-floor unit is installed above the first-floor unit, and a floor beam 23B of the second-floor portion 13 is provided above the ceiling beam 22A of the first-floor portion 12. In such a case, a gap is formed between the upper end of the first-floor ceiling beam 22A and the lower end of the second-floor beam 23B, and rock wool 58 as a gap filling material is disposed in a compressed state in this gap. . In the natural state, the rock wool 58 has a vertical dimension larger than the gap between the first-floor ceiling beam 22A and the second-floor beam 23B and has elasticity in at least the vertical direction. When assembled, it is crushed into a compressed state. The rock wool 58 is a fibrous member having excellent fire resistance, soundproofing, and heat insulating properties. The rock wool 58 can be attached at the construction site. However, in the unit manufacturing factory, the rock wool 58 is attached in advance to the large beam of the building unit 20 on either the upper floor side or the lower floor side. Is desirable.

  On the floor beam 23B (specifically, on the upper flange) of the second-floor portion 13 is provided a floor joist 61 (the upper beam joist) that supports the floor material 28B (floor material) from below, on the floor joist 61. The floor material 28B is fixed with screws, nails or the like. The floor material 28B is made of, for example, a particle board. Further, between the two left and right floor members 28B provided on the two adjacent floor beams 23B, a floor connecting member 62 that forms a floor surface flush with the floor member 28B (the same height) is provided. It has been. The floor connecting material 62 is formed of the same material as the floor surface material 28B, and is fixed to the floor joist 61 with screws, nails or the like. Rock wool 63 is disposed in a compressed state between the floor girder 23B and the floor material 28B. Further, at the portion where the floor beam 26B is provided, as shown in FIG. 5, the floor material 28B is attached to the floor joist 64 (beam joist) provided on the floor beam 26B by screws, nails or the like. The floor material 28B is fixed to the floor beam 26B directly by screws or nails.

  A field edge 67 (field beam edge) is fixed to the ceiling beam 22B (specifically, the lower flange) of the second floor portion 13 with screws or nails, and a ceiling surface material 27B is fixed to the lower surface of the field edge 67 with screws or nails. It is fixed by etc. The ceiling surface material 27B is configured, for example, by stacking two plaster boards. Further, between the two left and right ceiling surface members 27B provided on the two adjacent ceiling beams 22B, there is provided a ceiling connecting material 68 that forms a ceiling surface flush with the ceiling surface material 27B (same height). ing. The ceiling connecting material 68 is formed of the same material as the ceiling surface material 27B, and is fixed to the field edge 67 with screws, nails, or the like. Further, in the portion where the ceiling beam 25B is provided, as shown in FIG. 5, the ceiling surface material 27B is fixed to the ceiling beam 25B together with the field edge 69 (field edge for the beam) with screws, nails or the like. Has been.

  In addition, the floor connecting material 62 and the ceiling connecting material 68 are the floor portions between the units 20 after the installation of the building units 20 on the construction site, similarly to the floor connecting material 52 and the ceiling connecting material 56 of the first floor portion 12. And it is assembled so as to fill the gap in the ceiling part.

  Moreover, in the building 10 of this embodiment, it has the structure by which an attic room is formed in the roof part 14, and the attic floor for forming the floor part of an attic room above the ceiling large beam 22B of the second floor part 13 is comprised. Components are installed. Specifically, a plurality of floor beams 72 are connected to the ceiling beam 22B (one of the ceiling girder beam and the ceiling girder beam) of the second floor portion 13 using a bracket 71. An attic floor material 73 is fixed to the upper surface of the floor beam 72 by screws, nails or the like. Glass wool 74 is provided on the lower surface side of the attic floor material 73. Further, between two adjacent ceiling beams 22B (gap between the webs), the glass wool 75 is sandwiched between the ceiling beam 22B (specifically, the bracket 71) and the attic floor material 73. Is provided.

  Incidentally, in the configuration shown in FIG. 4, the configurations of the first-floor ceiling portion and the second-floor floor portion are different between the left side and the right side of the drawing with the boundary wall 30 at the center portion interposed therebetween. That is, on both the left and right sides of the figure, the glass wool 65 is installed on the upper surface of the ceiling face material 27A that has a different thickness at the ceiling portion of the first floor and the ceiling face material 27A is thicker (right side in the figure). ing. Further, on the right and left sides of the figure, the structure of the floor material of the second floor is different, and on the right side of the figure, the floor material 28B is composed of particle board and gypsum board, and the finished floor material 66 is on the upper surface. It is installed in a stacked state.

  In the above configuration, particularly in the right part of the figure, the fireproof performance and the soundproof performance are enhanced between the rooms on the upper and lower floors. Therefore, it can be said that the configuration on the right side of the figure is a preferable configuration when the upper and lower floors are different dwelling units, and the configuration on the left side of the diagram is a preferable configuration when the upper and lower floors are the same dwelling unit.

  Next, the “boundary wall 30” will be described. As shown in FIG. 4, the boundary wall 30 includes a first-floor room boundary wall 31, a first-floor ceiling back-boundary wall 32, a second-floor lower-boundary wall 33, a second-floor room-boundary wall 34, and a second-floor ceiling back boundary in order from the first-floor floor. It can be separated into a wall 35 and an attic wall 36. Each of these boundary walls 31 to 36 will be described. In the present embodiment, the boundary wall 30 is composed of a pair of left and right wall structural members shown in FIG.

  The first-floor room boundary wall 31 has a horizontal space between the lower surface (ceiling surface) of the ceiling surface material 27A and the upper surface (floor surface) of the floor surface material 28A in the first-floor portion 12, that is, a plurality of first-floor room spaces. It is provided at a height position for partitioning. Specifically, the first-floor room boundary wall 31 includes a wall surface material 83 between an upper base material 81 provided on the ceiling surface material 27A of the building unit 20 and a lower base material 82 provided on the floor surface material 28A. It was installed over the bridge. The wall surface material 83 is configured by, for example, stacking two plaster boards. On the back surface of the wall material 83, rock wool 84, which is a coating material excellent in fire resistance, sound insulation, and the like, is provided.

  Further, the first floor ceiling back wall 32 is provided integrally with the ceiling beam 22A of the first floor portion 12. The first floor ceiling backside wall 32 is accommodated by a field wall panel 90 as a field wall structure in a space in the beam (grooved steel groove) surrounded by a pair of upper and lower flanges and a web between the upper and lower ceiling beams 22A. The details will be described with reference to FIG. 6A and 6B are perspective views showing details of the first-floor ceiling back boundary wall 32. FIG. 6A shows a state before assembly of the field wall panel 90 to the ceiling beam 22A, and FIG. 6B shows assembly of the field wall panel 90. The latter state is shown, and (c) shows an exploded state of the field wall panel 90. Reference numeral 96 in FIG. 6 denotes a bracket for connecting the ceiling beam 25A to the ceiling beam 22A.

  As shown in FIG. 6 (c), the boundary wall panel 90 has, for example, a wall surface material 91 formed by stacking two plaster boards, and substantially the same size (substantially the same vertical and horizontal dimensions) as the wall surface material 91. It consists of a plate-like glass wool 92 that is stacked on one side, and a block-shaped base material 93 that is assembled to the part of the glass wool 92 that is notched (in this embodiment, both longitudinal ends of the glass wool 92). It is configured by being integrated.

  Then, as shown in FIGS. 6A and 6B, the glass wool 92 is opposed to the web of the ceiling girder 22A (ceiling girder girder), and a predetermined gap is formed between the glass wool 92 and the girder web. Thus, the field wall panel 90 is assembled to the ceiling beam 22A. At this time, screws and nails are driven from the outside of the ceiling beam 22A in accordance with the position of the base material 93, so that the field wall panel 90 is fixed to the ceiling beam 22A. A ceiling beam 25A is connected to the ceiling beam 22A (ceiling beam) by a bracket 96 at a predetermined interval, and the field wall panel 90 is assembled by being divided into a plurality of pieces so as not to interfere with the ceiling beam 25A. . Block-shaped rock wool 94 is assembled to the gap formed by dividing the boundary wall panel 90 and the side surface of the column 21. The rock wool 94 is configured as a gap filling material having fireproof performance and soundproof performance, and further has flexibility (is elastically deformable). It is possible to fill the gap without worrying about.

  In the unit manufacturing factory, the building unit 20 of the first floor portion 12 has one wall structure (wall surface material 83 or the like) constituting the first floor room boundary wall 31 and one of the first floor ceiling back boundary walls 32 constituting the first floor ceiling wall 32. The wall panel 90 is provided integrally.

  Returning to the description of FIG. 4, the second floor lower boundary wall 33 is integrally provided on the floor beam 23 </ b> B of the second floor portion 13. The second-floor lower floor wall 33 accommodates a wall panel 100 as a field wall structure in a space in the beam (grooved steel groove) surrounded by a pair of upper and lower flanges and a web between the upper and lower flanges 23B. The details will be described with reference to FIG. FIG. 7 is a perspective view showing details of the second floor lower boundary wall 33, (a) shows a state before the assembly of the field wall panel 100 to the floor beam 23 </ b> B, and (b) shows a state after the assembly of the field wall panel 100. A state is shown, (c) shows the decomposition | disassembly state of the field wall panel 100. FIG. In addition, the code | symbol 106 in FIG. 7 is a bracket for connecting the floor small beam 26B to the floor large beam 23B.

  As shown in FIG.7 (c), the boundary wall panel 100 has the wall material 101 comprised, for example by stacking two sheets of gypsum board, and the magnitude | size (substantially the same length and width dimension) as the wall surface material 101, for example. It consists of a plate-like glass wool 102 that is stacked on one side, and a block-like base material 103 that is assembled to a portion where a part of the glass wool 102 is cut out (in this embodiment, both longitudinal ends of the glass wool 102). It is configured by being integrated.

  Then, as shown in FIGS. 7A and 7B, the glass wool 102 is opposed to the web of the floor girder 23B (floor girder girder), and a predetermined gap is formed between the glass wool 102 and the girder web. Thus, the field wall panel 100 is assembled to the floor beam 23B. At this time, screws or nails are driven from the outside of the floor beam 23B in accordance with the position of the base material 103, so that the field wall panel 100 is fixed to the floor beam 23B. A floor beam 26B is connected to the floor beam 23B (floor beam) by a bracket 106 at a predetermined interval, and the field wall panel 100 is assembled by being divided into a plurality of pieces so as not to interfere with the floor beam 26B. . Block-shaped rock wool 104 is assembled to the gap portion formed by dividing the boundary wall panel 100 and the side surface portion of the column 21. The rock wool 104 is configured as a gap filling material having fireproof performance and soundproof performance, and further has flexibility (it can be elastically deformed). It is possible to fill the gap without worrying about.

  Returning again to the description of FIG. The second-floor room wall 34 is a height that partitions the space between the lower surface (ceiling surface) of the ceiling surface material 27B and the upper surface (floor surface) of the floor surface material 28B in the second-floor portion 13, that is, the second-floor room space portion in the horizontal direction. It is provided in the position. The second-floor room boundary wall 34 has the same configuration as that of the first-floor room boundary wall 31 described above. In FIG. The explanation is omitted here.

  The second-floor ceiling back wall 35 is provided integrally with the ceiling beam 22B of the second-floor portion 13. The second floor ceiling back wall 35 has the same configuration as the first floor ceiling back wall 32 described above. In FIG. 4, the ceiling large beam 22B is surrounded by a pair of upper and lower flanges and a web between them. A configuration is shown in which a field wall panel 90 (see FIG. 6 for details) is accommodated in a space portion in the beam (groove portion of channel steel). I will omit the explanation here.

  In the unit manufacturing factory, the building unit 20 of the second floor portion 13 has one wall panel 100 constituting the second floor lower boundary wall 33 and one wall structure constituting the second floor room boundary wall 34 (wall surface material 83 and the like). And one of the wall panels 90 constituting the second floor ceiling back wall 35 are integrally provided.

  The attic boundary wall 36 is provided in the roof portion 14 between the lower surface of a field board (not shown) and the upper surface of the attic floor surface material 73, that is, at a height position that partitions the attic space portion into a plurality of portions in the horizontal direction. The attic boundary wall 36 has the same configuration as that of the first-floor room boundary wall 31 described above. In FIG. 4, the same member number as that of the first-floor boundary wall 31 is assigned to the configuration of the attic boundary wall 36. The explanation is omitted here.

  Next, the “boundary wall 40” will be described. As shown in FIG. 5, the boundary wall 40 includes, in order from the first floor, the first floor room boundary wall 41, the first floor ceiling back wall 42, the second floor lower boundary wall 43, the second floor room boundary wall 44, and the second floor ceiling back boundary. It can be separated into a wall 45 and an attic wall 46. Among these boundary walls 41 to 46, the first-floor room wall 41 and the second-floor room wall 44 have the same configuration as the first-floor room wall 31 and the second-floor room wall 34 of the wall 30. Therefore, these boundary walls 41 and 44 are shown with the same member numbers (the same member numbers as in FIG. 4) in FIG. 5, and the description thereof is omitted here. Below, a structure is demonstrated in detail about the 1st floor ceiling back wall 42, the 2nd floor lower floor wall 43, the 2nd floor ceiling back wall 45, and the attic wall 46 which are the structures different from the wall 30. FIG. In the present embodiment, the boundary wall 40 is composed of a pair of left and right wall structural members shown in FIG.

  As described above, the boundary wall 40 is provided at a position different from the docking line DL of the building unit 20, and FIG. 5 does not show the ceiling large beam 22 and the floor large beam 23, but instead replaces the ceiling small beam. A beam 25 and a floor beam 26 are shown. Further, the pair of left and right wall structures shown in FIG. 5 are different in configuration, and the left wall structure in the figure is provided integrally with the ceiling beam 25 and floor beam 26 at the installation positions thereof. The wall structure on the right side is provided separately from the installation positions of the ceiling beam 25 and the floor beam 26. In other words, the installation interval (mounting pitch) of the ceiling beam 25 and the floor beam 26 is about 500 mm, for example, while the width of the boundary wall 40 (that is, the installation interval between the pair of left and right wall structures) is about 250 mm, for example. For this reason, at least one of the pair of left and right wall components is separated from the installation position of the ceiling beam 25 and the floor beam 26 and is provided separately from these beams.

  First, the structure of the first floor ceiling back wall 42 will be described. The first floor ceiling back wall 42 is configured by a field wall panel 110 being installed above the ceiling face material 27A at a height position where the ceiling beam 22A of the first floor portion 12 is installed. Details will be described with reference to FIG. FIG. 8 is a perspective view showing the details of the first floor ceiling back wall 42, (a) shows a state after the wall panel 110 is assembled, (b) shows a single body wall panel 110, (c ) Shows an exploded state of the field wall panel 110.

  As shown in FIGS. 8B and 8C, the wall panel 110 is composed of, for example, a wall surface material 111 formed by stacking two plaster boards, and approximately the same size as the wall surface material 111 (substantially the same vertical and horizontal dimensions). And a plate-like glass wool 113 incorporated into the inside of the frame 112, and these are integrated. The frame body 112 is configured by combining square members made of, for example, a wooden material on four sides. The glass wool 113 is incorporated in the frame body 112 in a state where there is no gap with the inner peripheral surface of the frame body 112 and is in contact with the wall surface material 111. The vertical dimension (height dimension) of the field wall panel 110 is substantially the same as the vertical dimension (web height dimension) of the ceiling beam 22A, and the horizontal dimension (longitudinal dimension) is the ceiling large beam on the short side (wife side). It is substantially the same as the length dimension of 22A. In addition, the wall surface material 111 and the frame 112 are integrated by screwing in a screw, a nail, etc. from the wall surface material 111 side (refer FIG. 5).

  Then, as shown in FIG. 8A, the field wall panel 110 is oriented in a direction orthogonal to the two opposing ceiling girder 22A (ceiling girder girder), that is, in a direction extending in the same direction (parallel) as the ceiling girder 25A. It is attached. Here, a backing material 115 is installed on the upper surface of the ceiling material 27A, and a field wall panel 110 is installed on the backing material 115 (see FIG. 5). The backing material 115 is a base plate material used for fixing the upper end portion (upper base material 81) of the first-floor room boundary wall 41 to the ceiling surface material 27A. The backing material 115 is made of, for example, a particle board, and one side has a length dimension between two facing ceiling beams 22A (ceiling beam beams), and the other side has two adjacent ceiling beams 25A. It has a rectangular plate shape with a length dimension between them. Then, staples, nails, or the like are driven into the frame body 112 of the field wall panel 110, and the field wall panel 110 is fixed by penetrating the staples and nails through the backing material 115 and the ceiling surface material 27A.

  The backing material 115 can be fixed to the ceiling beam 22A or the ceiling beam 25A. The backing material 115 is not limited to a particle board (plywood), but can be applied as long as it is a material suitable for screwing or the like and has a higher load bearing performance than a ceiling surface material.

  When the field wall panel 110 is attached as described above, a gap is formed between the longitudinal end of the field wall panel 110 and the web of the ceiling beam 22A (ceiling girder beam). Therefore, block-shaped rock wool 116 is assembled in this gap. As a result, between the two ceiling beams 22A facing each other, excellent fireproof performance and soundproof performance are ensured in any part of the first floor ceiling back wall 42 and both ends thereof.

  In FIG. 5, among the pair of left and right boundary wall panels 110 constituting the first floor ceiling back wall 42, the right side wall wall panel 110 (the boundary wall panel 110 provided apart from the ceiling beam 25A) in the drawing is described above. The configuration shown in FIG. 8 can be applied as it is. On the other hand, the configuration of the left side wall panel 110 (the wall wall panel 110 provided at the same position as the ceiling beam 25A) is slightly different from that in FIG. That is, the left-hand side wall panel 110 is provided on the ceiling beam 25A, and the vertical dimension (height dimension) of the frame body 112 is reduced by the height of the ceiling beam 25A. Yes. Moreover, the vertical dimension of the wall surface material 111 is larger than the vertical dimension of the frame body 112, and the lower end portion of the wall surface material 111 covers the opening (the groove opening of the lip channel steel) of the ceiling beam 25A. It is in a state. The field wall panel 110 is fixed by driving a screw, a nail, or the like into the frame body 112 of the field wall panel 110 and passing it through the ceiling beam 25A below it. Glass wool 117 is attached to the outside of the web of the ceiling beam 25A, and the ceiling beam 25A is sandwiched between the wall material 111 and the glass wool 117 on both sides in the vertical direction (the groove opening side and the outside of the web), respectively. It is in a state.

  In the unit manufacturing factory, the building unit 20 of the first floor portion 12 has a pair of left and right wall components (wall surface material 83 and the like) constituting the first floor room boundary wall 41 and left and right sides constituting the first floor ceiling back wall 42. A pair of field wall panels 110 are integrally provided.

  Next, the configuration of the second floor lower boundary wall 43 will be described. The second floor lower boundary wall 43 is configured by the boundary wall panel 120 being installed below the floor material 28B at the height position where the floor beam 23B of the second floor portion 13 is installed. 9 will be used for explanation. FIG. 9 is a perspective view showing details of the second floor lower boundary wall 43, (a) shows a state after the assembly of the boundary wall panel 120, (b) shows a single body of the boundary wall panel 120, and (c) shows The disassembled state of the field wall panel 120 is shown.

  As shown in FIGS. 9B and 9C, the wall panel 120 is composed of, for example, a wall surface member 121 formed by stacking two plaster boards, and approximately the same size as the wall surface member 121 (substantially the same vertical and horizontal dimensions). And a plate-like glass wool 123 incorporated in the inside of the frame 122, and these are integrated. The frame body 122 is configured by combining, for example, square members made of a wood-shaped material into four sides, and the upper side square members project in the longitudinal direction from the other parts, so that they are stretched at both ends in the longitudinal direction. A protruding portion 122a is formed. The glass wool 123 is incorporated in the frame body 122 with no gap with the inner peripheral surface of the frame body 122 and in contact with the wall surface material 121. The vertical dimension (height dimension) of the field wall panel 120 is substantially the same as the vertical dimension (web height dimension) of the floor beam 23B. Further, the horizontal dimension (longitudinal dimension) of the field wall panel 120 is substantially the same as the length of the ceiling large beam 22A on the short side (wife side) except for the overhanging portion 122a of the frame body 122. The overhanging portion 122a of the body 122 is larger than the length of the ceiling large beam 22A on the short side (wife side). Note that the wall surface material 121 and the frame body 122 are integrated by driving a screw, a nail, or the like from the wall surface material 121 side (see FIG. 5).

  Then, as shown in FIG. 9A, the field wall panel 120 is oriented in a direction orthogonal to the two opposing floor girder 23B (floor girder girder), that is, in a direction extending in the same direction (parallel) as the floor girder 26B. It is attached. Here, the boundary wall panel 120 is installed in a state where the overhanging portion 122a of the frame body 122 is placed on the flange of the floor girder 23B (floor girder girder). In this case, the overhanging portion 122a functions as a hooking portion, and the overhanging portion 122a is hooked on the floor large beam 23B, so that the field wall panel 120 is supported by being suspended. Specifically, a floor joist 61 is attached on the flange of the floor beam 23B (floor girder beam) along the longitudinal direction as shown in the figure, but the surplus portion where the floor joist 61 is not placed on the end of the flange The overhanging portion 122a is placed on the remaining portion, that is, the field wall panel 120 is installed with the overhanging portion 122a being close to the floor joist 61. The boundary wall panel 120 is fixed by driving staples, nails, or the like into the overhanging portion 122 a of the frame body 122 and the floor joist 61 to connect the frame body 122 to the floor joist 61. A configuration in which the frame body 122 is connected to the floor joist 61 by a locking connection between the frame body 122 and the floor joist 61, in addition to the frame body 122 being connected and fixed to the floor joist 61 by a fixing tool such as a staple or a nail. A configuration in which the frame body 122 is directly connected to the floor beam 23B is also possible.

  Here, it is desirable to provide the floor joist 61 at a position slightly offset from the inside of the unit on the floor girder 23B, so that the room wall panel 120 is naturally provided on the inside of the unit on the floor girder 23B. It is possible to give it. Further, if the height of the boundary wall panel 120 including the overhanging portion 122a (the hooking portion) is set to be equal to or lower than the upper end position of the floor joist 61, it is a hindrance when forming the floor surface of the upper floor. do not become.

  When the field wall panel 120 is attached as described above, a gap is formed between the longitudinal end portion of the field wall panel 120 and the web of the floor beam 23B (floor beam girder). Therefore, block-shaped rock wool 125 is assembled in this gap. Thereby, between the two floor beams 23B facing each other, excellent fireproof performance and soundproof performance are ensured in any part of the second floor lower boundary wall 43 and both ends thereof.

  In FIG. 5, among the pair of left and right wall constituents constituting the second floor lower boundary wall 43, the right side wall constituent (the wall constituent provided away from the floor beam 26B) in FIG. The wall panel 120 can be applied as it is. On the other hand, the structure of the left side wall structure (the wall structure provided at the same position as the floor beam 26B) is different from that of FIG. That is, the left side wall structure in the figure includes a wall material 127 and glass wool 128 provided on both sides of the floor beam 26B and the floor joist 64 thereon. In this case, the vertical dimension of the wall surface material 127 is larger than the vertical dimension of both the floor beam 26B and the floor joist 64, and the lower end portion of the wall material 127 protrudes downward from the floor beam 26B. ing. A plywood 129 is fixed to the lower end portion of the wall material 127 (portion protruding downward from the floor beam 26B) with screws, nails or the like.

  When the second floor unit is installed on the upper part of the first floor unit, a gap is formed between the upper end of the first floor ceiling back wall 42 and the lower end of the second floor lower wall 43, and the gap Rock wool 118 as a filling material is disposed in a compressed state. That is, in the wall structure on the right side of the figure, the rock wool 118 is disposed in the gap between the upper surface of the boundary wall panel 110 of the first floor ceiling back wall 42 and the lower surface of the boundary wall panel 120 of the second floor lower boundary wall 43. In the left side wall structure in the figure, rock wool 118 is disposed in the gap between the upper surface of the field wall panel 110 of the first floor ceiling back wall 42 and the lower surface of the wall material 127 of the second floor lower boundary wall 43. ing. In the natural state, the rock wool 118 has a vertical dimension larger than the gap between the first floor ceiling back wall 42 and the second floor lower wall 43 and has elasticity in at least the vertical direction. When the floor unit is assembled, it is crushed and compressed. The rock wool 118 is a fibrous member having excellent fire resistance, soundproofing, and heat insulation. The rock wool 118 can be attached at the construction site. However, in the unit manufacturing factory, the rock wool 118 is attached to the boundary wall (wall structure) of the building unit 20 on either the upper floor side or the lower floor side. It is desirable to paste in advance.

  The second-floor ceiling back wall 45 has a structure having different wall structures on the left and right in the drawing. The wall structure on the right side of the figure is configured by installing a field wall panel 110 (see FIG. 8 for details) provided as the first floor ceiling back wall 42. The main difference from the first floor ceiling back wall 42 is that the height dimension of the field wall panel 110 is different (the second floor ceiling back wall 45 is smaller in height). As the second floor ceiling back wall 45, a configuration is shown in which a wall panel 110 having the same number as that of the first floor ceiling back wall 42 is assembled. The configuration in which the boundary wall panel 110 is fixed to the backing material 115 for fixing the upper end portion (upper base material 81) of the second-floor room boundary wall 44 to the ceiling surface material 27B is also as described above.

  Further, in the second floor ceiling back wall 45, the left side wall structure (wall structure provided at the same position as the ceiling beam 25B) is sandwiched between the ceiling beam 25B and the field edge 69 below it. A wall material 131 and glass wool 132 provided on both sides are provided. In addition, a base wood 133 is provided on the upper surface of the ceiling beam 25B, and a wall material 131 is fixed to the base wood 133 by screws, nails or the like.

  In the unit manufacturing factory, the building unit 20 of the second floor portion 13 is provided with a pair of left and right wall structures (the right wall panel 120, the left wall material 127, etc. in FIG. 5) constituting the second floor lower boundary wall 43, and A pair of left and right wall components (wall surface material 83 and the like) constituting the second-floor room boundary wall 44 and a pair of left and right wall components (second wall panel 110 on the right side in FIG. The wall material 131 and the like are integrally provided.

  The attic wall 46 is composed of a lower wall structure (also referred to as an attic floor lower wall) and an upper wall structure (also referred to as an attic upper wall) across the attic floor material 73. First, the wall structure below the attic floor material 73 will be described.

  The wall structure (attic floor lower boundary wall portion) below the attic floor material 73 has a pair of left and right configurations as described above, and the right side of the figure is a boundary wall panel provided as the second floor lower boundary wall 43. 120 (see FIG. 9 for details) is installed. The main difference from the second floor lower boundary wall 43 is that the height dimension of the boundary wall panel 120 is different (the height dimension of the attic boundary wall 46 is smaller). The structure which assembled | attached the field wall panel 120 which attached | subjected the same number as the 2nd floor underworld wall 43 as an attic floor underworld wall part is shown. In this configuration, the field wall panel 120 is installed in a state where the projecting portion 122a of the frame body 122 is placed on the flange of the ceiling beam 22B (ceiling beam).

  Further, below the attic floor material 73, the left side wall structure (the wall structure provided at the same position as the attic floor beam 72) is provided on both sides of the floor beam 72. Wall surface material 135 and glass wool 136 to be formed. In this configuration, the wall material 135 is fixed to the floor beam 72 by screws, nails or the like.

  The upper wall structure (attic floor upper wall) of the attic floor member 73 is horizontally located between the lower surface of the field board (not shown) and the upper surface of the attic floor material 73 in the roof portion 14, that is, in the attic space. It is divided into a plurality of directions. This has the same configuration as the attic wall 36 of the boundary wall 30 described above, and FIG. 5 shows a configuration with the same member numbers as the attic boundary wall 36 of the boundary wall 30.

  Rock wool 138 is disposed between the second floor ceiling back wall 45 and the attic wall 46 in a compressed state. That is, in the wall structure on the right side of the figure, the rock wool 138 is disposed in the gap between the upper surface of the field wall panel 110 of the second-floor ceiling back wall 45 and the lower surface of the field wall panel 120 of the attic wall 46, In the left wall structure in the figure, rock wool 138 is disposed in a gap between the upper surface of the ceiling beam 25B and the wall material 131 and the lower surface of the floor beam 72 and the wall material 135. The rock wool 138 is larger in the vertical direction than the gap between the second floor ceiling back wall 45 and the attic wall 46 in the natural state (the gap generated in the part when the upper floor unit is placed on the lower floor unit). It has elasticity at least in the vertical direction, and is crushed and compressed when the roof unit constituting the roof portion 14 is assembled on the upper floor unit. Rock wool 138 is a fibrous member having excellent fire resistance, soundproofing, and heat insulating properties. The rock wool 138 can be attached at the construction site, but in the unit manufacturing factory, the rock wool 138 is affixed in advance to the boundary wall (wall structure) of either the upper floor unit or the roof unit. It is desirable.

  Next, the underfloor structure of the building 10 will be described. In the present embodiment, as the underfloor structure, there is provided a blocking unit that blocks the movement of a person under the floor between two adjacent dwelling units and allows the air to flow under the floor between the dwelling units. Details will be described below.

  FIG. 10 is a cross-sectional view showing the configuration of the lower floor portion of the building 10. FIG. 10 is a cross-sectional view below the floor along line X1-X1 in FIG. 2, that is, a cross-sectional view below the portion that crosses the boundary wall 30 provided along the docking line DL (unit boundary line) between the building units 20. . This is a cross-sectional view showing the underfloor structure below the boundary wall 30 shown in FIG.

  As shown in FIG. 10, on the floor material 28A above the two floor beams 23A of the first floor portion 12, as described above, the boundary wall 30 (the boundary wall provided at the same position as the docking line DL of the building unit 20). ) Is provided. In the underfloor space 15 of the building 10, a floor girder 23A is provided so as to protrude downward from the floor surface material 28A. Similarly, in the underfloor space 15, below the two floor beams 23A, that is, directly below the boundary wall 30, along the longitudinal direction of the floor beams 23A of the first floor portion 12, that is, in a direction parallel to the floor beams 23A. In addition, an underfloor partition wall 150 is provided as a blocking portion. The underfloor partition wall 150 is configured as a concrete rising portion protruding upward from the ground.

  Specifically, a quarry layer G1 and a discarded concrete layer G2 are provided in two layers in the upper and lower sides, and an underfloor partition wall 150 is formed on the discarded concrete layer G2. The underfloor partition wall 150 is configured by stacking a plurality of rectangular parallelepiped concrete blocks 151, and the height position of the upper end portion thereof is the same as the upper end portion of the foundation 11. More specifically, the underfloor partition wall 150 is configured by placing concrete in a state in which vertical reinforcing bars as reinforcing materials are arranged in the reinforcing holes of the concrete blocks 151 stacked in plurality.

  In the configuration of FIG. 10, the two large floor beams 23 </ b> A and the underfloor partition wall 150 are provided to be separated from each other, and air flow in the underfloor space 15 is allowed between the large floor beams 23 </ b> A and the underfloor partition wall 150. A clearance CL1 is formed. The gap CL1 is formed so that a person cannot pass therethrough and has an effective gap dimension D1 for underfloor ventilation. Specifically, the clearance dimension D1 may be 9 mm or more for effective ventilation, but in the present embodiment, the clearance dimension D1 is set to about 30 to 100 mm in consideration of workability and wiring / pipe workability.

  In the illustrated configuration, the underfloor partition wall 150 is disposed at the center of the two floor beams 23A, but may be disposed so as to be biased to one of the floor beams 23A. Further, the height position of the upper end portion of the underfloor partition wall 150 may not be the same as the upper end portion of the foundation 11, and may be higher or lower than the upper end portion of the foundation 11. In this case, by increasing the height position of the upper end portion of the underfloor partition wall 150, the large floor beam 23A and the underfloor partition wall 150 are separated by a predetermined gap, and the underfloor partition wall 150 faces the web of the large floor beam 23A. It is good also as composition to do. In short, it is only necessary to form a gap CL1 between the large floor beam 23A and the underfloor partition wall 150, which cannot pass a person and has an effective gap size for underfloor ventilation.

  11 is an underfloor cross-sectional view taken along line X2-X2 in FIG. 2, that is, an underfloor cross section of a portion crossing the boundary wall 40 provided at a position different from the docking line DL (unit boundary line) between the building units 20. FIG. This is a cross-sectional view showing the underfloor structure below the boundary wall 40 shown in FIG.

  As shown in FIG. 11, the boundary wall 40 (the boundary wall provided at a position different from the docking line DL of the building unit 20) is provided on the floor material 28 </ b> A in the first floor portion 12 as described above. In the underfloor space 15 of the building 10, a floor beam 26A is provided so as to protrude downward from the floor surface material 28A. Similarly, in the underfloor space 15, a position just below the boundary wall 40 is below the floor as a blocking portion along the longitudinal direction of the floor beam 26 </ b> A of the first floor portion 12, that is, in a direction parallel to the floor beam 26 </ b> A. A partition wall 155 is provided. Like the underfloor partition wall 150 described above, the underfloor partition wall 155 is configured as a concrete rising portion that protrudes upward from the ground, and is formed on the discarded concrete layer G2. The underfloor partition wall 155 is configured by stacking a plurality of rectangular parallelepiped concrete blocks 156, and the height position of the upper end portion thereof is the same as the upper end portion of the foundation 11. Like the underfloor partition wall 150, the underfloor partition wall 155 is configured by placing concrete in a state in which vertical reinforcing bars as reinforcing materials are disposed in the rebar arrangement holes of the stacked concrete blocks 156.

  In the configuration of FIG. 11, the floor beam 26A and the underfloor partition wall 155 are provided to be separated from each other, and air flow in the underfloor space 15 is allowed between the floor beam 26A and the underfloor partition wall 155. A clearance CL2 is formed. The gap CL2 is formed so that a person cannot pass through and has an effective gap dimension D2 for underfloor ventilation. Specifically, the gap dimension D2 may be 9 mm or more as effective for ventilation, but in this embodiment, the gap dimension D2 is set to about 30 to 100 mm in consideration of workability and wiring / pipe workability.

  In addition, the height position of the upper end part of the underfloor partition wall 155 may not be the same as the upper end part of the foundation 11, and may be higher or lower than the upper end part of the foundation 11. In this case, by increasing the height position of the upper end portion of the underfloor partition wall 155, the floor beam 26A and the underfloor partition wall 155 are separated from each other by a predetermined gap, and the underfloor partition wall 155 is disposed vertically with respect to the floor beam 26A. It is good also as a structure which opposes a side part. In short, it is only necessary to form a gap CL2 between the floor beam 26A and the underfloor partition wall 155 that cannot pass a person and that has an effective gap dimension for underfloor ventilation.

  FIG. 12 is a plan view showing an installation layout of the underfloor partition walls 150 and 155 provided along the boundary walls 30 and 40. FIG. 12 shows a configuration in which four dwelling units A1 to A4 are formed on the same floor by six building units 20 as in FIG. 2 described above, and the underfloor partition wall 150 includes dwelling units A1-A2 and dwelling units A3. -A4 is provided between the dwelling units A1-A3 and between the dwelling units A2-A4.

  As shown in FIG. 12, the underfloor partition wall 150 is provided along the unit boundary on the long side (girder side) of the building unit 20, whereas the underfloor partition wall 155 includes the underfloor partition wall 150 and It is provided at a position away from the unit boundary portion on the short side (wife side) of the building unit 20 in a direction orthogonal (direction in which the longitudinal direction is orthogonal). These are the same as the installation positions of the boundary walls 30 and 40. A plurality of underfloor partition walls 150 and 155 are provided along the boundary walls 30 and 40, respectively, and gaps CL3 are formed between the underfloor partition walls 150 and between the underfloor partition walls 155, respectively. That is, the underfloor partition walls 150 and 155 are configured as a plurality of wall portions that extend along the boundary wall and are installed at predetermined intervals.

  The gap CL3 has a width dimension that allows piping and wiring to pass therethrough and cannot pass through (invade) by humans. For example, the width in the longitudinal direction of the wall is set to about 150 to 200 mm. Yes. Thereby, the underfloor partition walls 150 and 155 are set so as to allow passage of piping and wiring in addition to the circulation of air in the underfloor space 15.

  According to the embodiment described in detail above, the following excellent effects can be obtained.

  In the underfloor space 15 of the building 10, a person is prevented from moving in the underfloor space 15 at a position directly below the boundary walls 30 and 40 provided on the floor, and air is allowed to flow in the underfloor space 15 between the dwelling units. Since the underfloor partition walls 150 and 155 are provided, the suspicious behavior of entering from one dwelling unit to another dwelling unit through the underfloor space 15 is restricted, while the ventilation performance in the underfloor space 15 is maintained while maintaining fire prevention performance. There is an advantage that it is much improved than before.

  In addition, according to the configuration in which the underfloor partition walls 150 and 155 are provided directly below the boundary walls 30 and 40, it is not necessary to consider the offset between the underfloor partition walls 150 and 155 and the boundary walls 30 and 40 in plan view. This is advantageous in terms of design and construction. That is, in the configuration in which the underfloor partition walls 150 and 155 are provided at positions that are not directly below the boundary walls 30 and 40, the underfloor partition walls 150 and 155 are set so as to prevent people from coming and going in consideration of the offset. There are many points that need to be taken into consideration during design and construction, but these disadvantages can be eliminated.

  The underfloor partition walls 150 and 155 are configured as rising portions that protrude upward from the ground and extend along the boundary walls 30 and 40. Then, below the boundary wall 30 (the boundary wall provided at the same position as the docking line DL of the building unit 20), a predetermined gap CL1 is provided between the upper end portion of the underfloor partition wall 150 and the first floor floor beam 23A. Formed below the boundary wall 40 (a boundary wall provided at a position different from the docking line DL of the building unit 20), between the upper end of the lower floor partition wall 155 and the floor beam 26A on the first floor. It was set as the structure which forms the clearance gap CL2 (refer FIG. 10, FIG. 11). Accordingly, air flow is allowed by a simple configuration in which the gaps CL1 and CL2 are provided between the upper ends of the lower partition walls 150 and 155 and the floor large beam 23A and the floor small beam 26A as the floor constituent material. be able to. In the underfloor space 15, the large floor beams 23A and the small floor beams 26A are exposed below the floor material. Therefore, in the unit type building, the underfloor partition walls 150 and 155, the large floor beams 23A and the small floor beams 26A It is advantageous from the viewpoints of design and construction that the gaps CL1 and CL2 are formed between the two.

  As described above, according to the configuration using the gaps CL1 and CL2, the following advantages are also obtained. In other words, because of the nature of the underfloor partition walls 150 and 155 existing from the viewpoint of crime prevention that prevents people from coming and going, it is desirable that the underfloor partition walls 150 and 155 be robust, but the underfloor partition walls 150 and 155 If it is intended to secure the air flow alone, it is necessary to form through holes in the underfloor partition walls 150 and 155, and it is necessary to compensate for the strength reduction due to the through holes with a sufficient reinforcing material. In this respect, according to the above configuration, since the gaps CL1 and CL2 with the floor constituent material are used, there is an advantage that excessive reinforcement is not necessary.

  Further, in the configuration in which the gaps CL1 and CL2 exist between the floor partition walls 150 and 155 and the floor constituent material as described above, the necessary gaps CL1 and CL2 prevent air movement while preventing human movement. Any condition may be used as long as the conditions permitting the distribution of the above are satisfied. Therefore, the height accuracy of the underfloor partition walls 150 and 155 may be considerably low, and the required level of accuracy in each process of design, manufacture, and construction is lowered, so that a significant reduction in installation costs can be expected. .

  In addition to improving the underfloor ventilation performance under the floor of multiple dwelling units, the underfloor partition walls 150 and 155 are set so as to allow passage of piping and wiring in addition to air circulation. Piping and wiring can be further passed through the underfloor space 15. As a result, the degree of freedom of the layout for installing wiring and piping can be increased, and the workability can be greatly improved.

  Since the underfloor partition walls 150 and 155 are configured as a plurality of wall portions that extend along the boundary walls 30 and 40 and are installed at predetermined intervals, gaps between the walls are used for air circulation, piping and wiring It can be used for the penetration part for.

[Other Embodiments]
The present invention is not limited to the description of the above embodiment, and may be implemented as follows, for example.

  -You may change the underfloor structure of the building 10 like FIG. 13 (a) (b). 13 (a) and 13 (b) are cross-sectional views showing the underfloor structure below the boundary wall 30 (the boundary wall provided at the same position as the docking line DL of the building unit 20), as in FIG. 10 described above.

  In the underfloor structure shown in FIG. 13A, in the underfloor space 15 of the building 10, below the two floor beams 23A, that is, directly below the boundary wall 30, along the longitudinal direction of the floor beams 23A of the first floor portion 12, That is, the connecting foundation 161 is provided in a direction parallel to the floor beam 23A. The connecting foundation 161 is an underground beam member that is continuously provided in the underground portion (footing) of the foundation 11 so that movement, twisting, uneven settlement, and the like of the foundation 11 are suppressed by connecting the foundations together. It has become. The connection foundation 161 is lower than the foundation 11 from the ground, and the building unit 20 is not installed on the upper part thereof. In this case, the foundation 11 (cloth foundation) is provided at least in a portion surrounding the outer edge of the building 10, whereas the connection foundation 161 is provided at a position connecting intermediate portions that face each other in the foundation 11. . The reinforcing bar 161 a of the connecting foundation 161 extends from the foundation 11.

  The upper end of the connection foundation 161 protrudes upward from the ground (actually embankment), and an underfloor partition wall 162 as a blocking portion is provided on the upper surface of the connection foundation 161. The underfloor partition wall 162 is configured as a concrete rising portion protruding upward from the ground. Specifically, the underfloor partition wall 162 is configured by stacking a plurality of rectangular parallelepiped concrete blocks 163, and the height position of the upper end portion thereof is the same as the upper end portion of the foundation 11. More specifically, the underfloor partition wall 162 is configured by placing concrete in a state in which a vertical reinforcing material as a reinforcing material is arranged in a reinforcing hole in a plurality of stacked concrete blocks 163.

  In the configuration of FIG. 13A, two floor beams 23A and an underfloor partition wall 162 are provided apart from each other, and air flows in the underfloor space 15 between the floor beam 23A and the underfloor partition wall 150. A gap CL1 is formed to allow the above. The configuration and effects relating to the gap CL1 are the same as the configuration of FIG. 10 described above.

  In the underfloor structure shown in FIG. 13B, a wall plate member 165 as a hanging portion is attached to one of the two floor beams 23A in the underfloor space 15 of the building 10 along the longitudinal direction of the floor beam 23A. It has been. The wall plate material 165 is made of a plate material such as a metal plate or a reinforced plastic plate, and is connected to the web of the floor large beam 23A by a fastener (not shown) such as a bolt or a welding process, so that the wall plate material 165 is below the floor large beam 23A. It is attached in a state where it hangs down and is separated from the ground. The vertical width dimension of the wall plate material 165 is shorter than the height dimension from the floor material (floor surface material 28A and the underfloor heat insulating material 53) of the first floor portion 12 to the ground (actually the embankment surface), In a state where the wall plate material 165 is attached to the web of the floor beam 23A, a gap CL4 is formed between the lower end portion of the wall plate material 165 and the embankment surface. The gap CL4 is a gap for allowing air to flow in the underfloor space 15, and the configuration and effect thereof are the same as those of the configuration shown in FIG. In addition, it is also possible to comprise a hanging part in a surface lattice member, a net | network body, etc.

  Since the configuration of FIG. 13B is provided with a hanging portion on the building side, consideration regarding the boundary wall can be eliminated when the foundation 11 is constructed.

  13A and 13B can be embodied as an underfloor structure below the boundary wall 40 (a boundary wall provided at a position different from the docking line DL of the building unit 20). In this case, an underfloor partition wall 162 on the connection foundation 161 shown in FIG. 13A is provided to face the floor beam 26A. Moreover, the wall board material 165 shown in FIG.13 (b) is attached in the state hung down below the floor beam 26A, and spaced apart from the ground.

  In the configuration of FIG. 13B, the wall plate material 165 may be provided on the floor large beam 23A (or the floor beam 26A) so as to be foldable or extendable. For example, the wall plate member 165 is configured to be provided with a hinge for connection with the floor large beam 23A (or the floor small beam 26A). Or it is set as the structure expanded and contracted by each sliding the wall board divided | segmented into plurality. Furthermore, it is good also as a structure which connects the wall board | plate material 165 to the floor large beam 23A (or floor small beam 26A) in the case of site construction. In this way, even if the wall plate material 165 can be folded, stretchable, or installed on the site, even if the wall plate material 165 (hanging portion) protrudes significantly downward from the building unit 20, the manufacturing process and transport process in the factory The hanging part does not get in the way.

  Here, when the building units 20 are arranged side by side at a construction site, a process of installing one building unit first, and then installing an adjacent building unit, instead of installing the building units at once, is generally performed. Is. Accordingly, when one building unit is installed, a hanging part is expanded from the floor large beam 23A (or floor beam 26A) of the installed building unit or a hanging part is formed on the floor beam 23A (or floor beam 26A). If it is a construction sequence in which a hanging part is constructed in a part of a building by connecting them and then an adjacent building unit is installed, the construction on site can be performed efficiently.

  -As the underfloor structure, separate the underfloor partition wall (blocking part) that forms a gap exclusively used for air flow and the underfloor partition wall (blocking part) that forms a gap mainly used as a passage for piping and wiring It is also possible to provide it.

  In the above embodiment, a building having both the boundary wall 30 (the boundary wall provided along the unit docking line DL) and the boundary wall 40 (the boundary wall provided at a position different from the unit docking line DL) is exemplified. However, it is also possible to realize a building having only the boundary wall 30 as a door boundary wall or a building having only the boundary wall 40 as a door boundary wall.

  In the above embodiment, the present invention is applied to a two-story unit type building, but the present invention is applied to other types of buildings such as a one-story unit type building or a unit type building having three or more floors. Is also possible. In addition, it can be applied to buildings other than unit type buildings.

The front view which shows schematic structure of the building in embodiment. The top view which shows the arrangement | sequence of the building unit which comprises a building. The perspective view which shows the structure of a building unit. Sectional drawing which shows the cross-sectional structure of a boundary wall and its peripheral part. Sectional drawing which shows the cross-sectional structure of a boundary wall and its peripheral part. The perspective view which shows the detail of a 1st-floor ceiling back wall. The perspective view which shows the detail of a 2nd floor underworld wall. The perspective view which shows the detail of a 1st-floor ceiling back wall. The perspective view which shows the detail of a 2nd floor underworld wall. Sectional drawing which shows the structure of the lower floor part of a building. Sectional drawing which shows the structure of the lower floor part of a building. The top view which shows the installation layout of the underfloor partition wall provided along a boundary wall. Sectional drawing which shows the structure of the underfloor part of the building in other embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Building, 20 ... Building unit, 21 ... Column, 22 ... Ceiling girder (ceiling beam), 23 ... Floor girder (floor beam), 25 ... Ceiling girder (ceiling beam), 26 ... Floor girder (floor beam) , 30, 40 ... boundary walls, 150, 155, 162 ... under-floor partition walls (rising parts), 165 ... wall plate materials (hanging parts), A1-A4 ... dwelling units, CL1-CL4 ... gaps.

Claims (8)

It is an underfloor structure of a building provided with a boundary wall that partitions the first dwelling unit and the second dwelling unit,
Under the floor, there is provided a blocking portion for blocking the movement of a person under the floor between the first and second dwelling units across the boundary wall and allowing the air to flow under the floor between the first and second dwelling units. The underfloor structure of the building, characterized by   The underfloor structure of a building according to claim 1, wherein the blocking portion is provided directly below the boundary wall. The blocking portion is a rising portion that protrudes upward from the ground and extends along the boundary wall,
The underfloor structure of a building according to claim 1 or 2, wherein a gap is formed between an upper end portion of the rising portion and a floor constituent material. The building is a unit type building configured by combining a plurality of building units,
Each of the building units includes a plurality of columns and ceiling beams and floor beams connected to the top and bottom of the columns.
The underfloor structure of a building according to claim 3, wherein the gap is formed between the floor beam and the rising portion. The blocking portion is a hanging portion that protrudes downward from the floor component and extends along the boundary wall,
The underfloor structure of a building according to claim 1 or 2, wherein a lower end portion of the hanging portion is separated from the ground. The building is a unit type building configured by combining a plurality of building units,
Each of the building units includes a plurality of columns and ceiling beams and floor beams connected to the top and bottom of the columns.
The underfloor structure of a building according to claim 5, wherein the hanging portion is connected to the floor beam.   The underfloor structure of a building according to any one of claims 1 to 6, wherein the blocking portion is set to allow passage of piping and wiring in addition to the flow of air.   The underfloor structure of a building according to any one of claims 1 to 7, wherein the blocking portion is a plurality of wall portions that extend along the boundary wall and are installed at predetermined intervals.

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