JP5791416B2 - Building floor structure - Google Patents

Description

  The present invention relates to a floor structure of a building, and more particularly to a floor structure suitable for installing a bus unit in a building unit.

  Conventionally, when installing a bathroom in a building unit having a skeleton member, it is common to install a bus unit on a floor beam that constitutes the skeleton member.

In addition, the installation height of the bath unit and the bathtub with respect to the building unit is lower than the floor in order to prevent a step between the floor of the bath unit and the floor of the room adjacent to the bathroom. Are also known (see, for example, Patent Document 1 and Patent Document 2).
Among these, Patent Document 2 discloses a technique in which a floor beam of a skeleton member is removed from a building unit to form an opening in the floor, a dropping floor is formed in the opening, and a bus unit is installed on the dropping floor. It is disclosed.

JP 2002-4429 A JP 2010-159602 A

In the technique described in Patent Document 2 described above, floor beams are cut out during renovation after installation of a building unit, a floor opening is formed over the entire width of the building unit, and a bus unit is installed in the floor opening. It was an installed structure.
For this reason, the bus unit is restricted to a size that covers the entire width of the building unit, and the living room space outside the bathroom is also restricted by the bus unit, and the degree of freedom in design is limited.

  An object of the present invention is to solve the above-described problems, and provides a floor structure of a building capable of improving the degree of design freedom in a floor structure in which a floor opening is provided on a floor of a building. The purpose is that.

In order to achieve the above object, the present invention provides a pair of floor girder beams and a pair of floor girder beam beams provided on a skeleton member that forms a skeleton of a building, and installed on the four circumferences of the floor. A floor opening that is part of the floor in a direction along the floor girder large beam from one of the floor girder large beams, and is opened across the entire width in the direction along the floor girder large beam, and faces the floor opening. The beam girder reinforcing member attached to the pair of floor girder girder, the wife girder reinforcing member attached to the floor girder girder, and the girder girder reinforcing member and the girder girder reinforcing member supported from the floor. and small beam members disposed be low position, the floor openings of the external existing floor side edges smell Te of the existing between the floor and the small beam member at the level of the floor girder girders a first lower floor joists that spans between, in the floor opening, the existing floor The small between the beam members are arranged in substantially equal height as the first lower floor joists, and the first lower and the wife girders reinforcing member across the direction along the floor opening in the floor girder girders A second lower floor beam spanned between the floor beam and the second lower floor beam that covers a part of the floor opening and is supported by the second lower floor beam and extends along the floor girder beam. e Bei added and flooring, the forming an additional bed of consecutive floor, the wife girders reinforcing member, and the small beam support bracket for supporting the second lower floor joists, via said joists pivot bracket The floor structure of the building is characterized by comprising a support bracket support bracket for supporting the beam member at a position lower than the second lower floor beam .
According to a second aspect of the present invention, in the building floor structure according to the first aspect, the second lower floor beam and the beam member are arranged orthogonally. It was.

In addition, the invention according to claim 3 is the floor structure of the building according to claim 1 or 2 , wherein the second lower floor beam has both ends in the longitudinal direction and the end face beam reinforcing member. The floor structure of the building is characterized by being supported by beam support brackets respectively coupled to the first lower floor beam.
The invention according to claim 4 is the building floor structure according to any one of claims 1 to 3 , wherein a floor heat insulating material is provided below the additional flooring. The floor structure of the building is characterized by
Further, the invention according to claim 5 is the floor structure of the building according to claim 4 , wherein a drop floor is supported by the beam member, and a drop floor is formed at a position lower than the floor, A floor heat insulating material is provided below the dropped floor material, and a side heat insulating material is provided between a side edge of the dropped floor and the floor girder beam and floor girder beam. The floor structure of the building was used.
According to a sixth aspect of the present invention, in the building floor structure according to any one of the first to fifth aspects, a bus unit is supported by the beam member through the floor opening. The floor structure of the building is characterized by this.

In the present invention, an additional floor that is continuous with an existing floor outside the floor opening is set in a part of the floor opening formed across the entire width between the floor beams and a small opening is formed in the remaining opening. The beam member was installed lower than the existing floor.
For this reason, the modeling variation of a floor increases and a design freedom improves. In addition, since the first lower floor beam and the second lower floor beam are installed below the periphery of the floor opening, the supporting strength of the existing floor and the additional floor can be secured.

Furthermore, in the invention according to claim 3 , the second lower floor beam is formed by a beam support bracket coupled to the end beam beam arranged at both ends of the floor opening and the first lower floor beam. I tried to support it. For this reason, the support strength by the second lower floor beam can be secured.
Moreover, in the invention of Claim 4 , since the floor heat insulating material was provided under the additional floor material, the heat insulation of the additional floor newly installed in the floor opening part can be ensured.
Further, in the invention according to claim 5 , in the dropped floor formed by supporting the dropped floor material with the small beam member, a floor heat insulating material is provided below the dropped floor material, and the side edge of the dropped floor and the floor girder beam Since the side heat insulating material is provided between the floor girder and the floor girder, high heat insulation can be secured in the dropped floor provided by dropping from the floor opening.
In addition, in the invention described in claim 6 , since the bus unit is supported by the small beam member, it is possible to improve the installation flexibility of the drop-in type bus unit.

FIG. 1 is a perspective view showing a skeleton member of a building unit to which a building floor structure according to an embodiment of the present invention is applied. Drawing 2 is a figure showing the floor structure part of the building unit to which the floor structure of the building of an embodiment is applied, (a) is a top view, (b) is a line of Sb-Sb of (a). It is sectional drawing which shows the state cut | disconnected by the position. FIG. 3 is a flowchart illustrating a work procedure for constructing the floor structure of the building according to the embodiment. FIG. 4 is a perspective view for explaining the removal work of the floor beam at the time of constructing the floor structure of the building according to the embodiment, (a) before removal, (b) during removal, (c) after removal. Shows the state. FIG. 5 is a perspective view illustrating a first partition lower floor beam beam attaching operation when the floor structure of the building according to the embodiment is constructed. FIG. 6 is a perspective view illustrating a work of attaching the end-to-end beam reinforcing member when the floor structure of the building according to the embodiment is constructed. FIG. 7 is a perspective view showing a girder beam reinforcing member attaching operation when the floor structure of the building according to the embodiment is constructed. FIG. 8 is a perspective view illustrating a work for attaching a beam support when the floor structure of the building according to the embodiment is constructed. FIG. 9 is a perspective view illustrating a beam member attaching operation when the floor structure of the building according to the embodiment is constructed. FIG. 10 is a perspective view showing a state at the time of mounting the beam member in the beam beam mounting operation at the time of constructing the floor structure of the building according to the embodiment, changing the viewpoint from FIG. 9. FIG. 11 is a perspective view showing a state when the first beam under the partition is attached in the work of attaching the first beam at the time of constructing the floor structure of the building according to the embodiment, changing the viewpoint from FIG. 9. FIG. 12 is a perspective view illustrating a floor joist attaching operation when the floor structure of the building according to the embodiment is constructed. FIG. 13 is a perspective view illustrating a floor heat insulating material installation operation at the time of constructing the floor structure of the building according to the embodiment. FIG. 14 is a perspective view illustrating a floor material installation operation at the time of building the floor structure of the building according to the embodiment. FIG. 15 is a perspective view illustrating a side heat insulating material installation operation at the time of building the floor structure of the building according to the embodiment. FIG. 16 is a diagram for explaining the renovation using the floor structure of the building of the embodiment, (a) is a plan view of the unit building before the renovation, and (b) is the unit building after the renovation. It is a top view.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
In the present embodiment, when the first floor portion of the unit building H shown in FIG. 16 (a) is renovated as shown in FIG. Will be described as changing to a drop-in type bus unit BU placed under the floor.

Below, the floor structure of embodiment is demonstrated based on FIGS.
The unit building H shown in FIG. 16 is configured by combining a plurality of building units UN. As is well known, each building unit UN includes a metal skeleton member 10 serving as a skeleton shown in FIG.

As shown in the plan view of FIG. 2A, the skeletal member 10 is formed in a rectangular frame shape by a pair of floor girder beams 11 and 11 and a pair of floor girder beams 12 and 12. A plurality of metal floor beams 13 are bridged between the floor beams 11 and 11.
The ceiling portion is also formed in a rectangular frame shape by the ceiling girder beams 17 and 17 and the ceiling girder beams 18 and 18, and is formed in a box frame shape by being coupled to the floor structure portion by pillars 19 at the four corners of the rectangle. Yes.

  As shown in FIG. 2A, a wooden floor joist 14 is bridged between the floor girder beams 12 and 12. As shown in FIG. 2B, the floor joists 14 are installed on the floor beam 13, and a floor material 15 is provided on the floor joists 14.

  In the present embodiment, in the building unit UN, a dropped floor DFL (see FIG. 15) lower than the height of the existing floor FL in another area is formed in the installation area SU shown in FIG. That is, in the present embodiment, the bus unit BU (see FIG. 16) is installed in the installation area SU when renovating a house. This bus unit BU eliminates a step between the bathroom floor FL3 (see FIG. 16) and the existing floor FL (see FIG. 5) in the adjacent room, and from the bathroom floor FL3 to the edge of the bathtub. This is a so-called drop-in type whose rising height is about 20 cm to 45 cm. For this reason, the floor DFL (see FIG. 15) is formed in the installation area SU by dropping below the height of the floor FL of the room outside the bathroom.

  Therefore, in the present embodiment, first, a work procedure until the dropping floor DFL is formed in the installation area SU will be described, and based on this, the floor structure of the building of the embodiment will be described.

FIG. 3 is a flowchart showing a work procedure.
In the first step S1, the floor material, floor joists and floor beam are removed.
In the next step S2, the first partition lower floor beam is attached.
In the next step S3, a work for attaching the end beam reinforcement member is performed.
In the next step S4, a girder beam reinforcing member attaching operation is performed.
In the next step S5, a small beam receiving bracket mounting operation is performed.
In the next step S6, a beam member mounting operation is performed.
In the next step S7, floor joist installation work is performed.
In the next step S8, floor insulation material installation work is performed.
In the next step S9, flooring installation work is performed.
In the next step S10, side heat insulating material installation work is performed.
In the next step S11, piping and flooring airtight work is performed.
In the next step S12, bus unit installation work is performed.

Each operation will be described in detail below.
(Removal work of floor boards, floor joists and floor beams)
In the removal work of the floor material 15, the floor joist 14, and the floor beam 13, first, the wooden floor material 15 and the floor joist 14 are included within the range where the bus unit BUb is installed, including the installation area SU shown in FIG. Then, the metal floor beam 13 is removed.
In the present embodiment, the two floor beams 13 and 13 (the ones denoted by reference numeral 13 (a) in FIG. 2 (a)) are removed. In this case, the beam receiving flanges 13a connected to both ends in the longitudinal direction of the floor beam 13 shown in FIG. 4A and to the floor beam girder 11 are used, for example, by using a cutting machine C such as a reciprocating saw. It cut | disconnects and removes the floor beam 13 as shown in FIG.4 (b) (c).
As a result, as shown in FIG. 5, the floor opening 16 is opened over the entire width of the building unit (full width in the direction along the floor girder beam 12) including the installation area SU in the floor FL.

(Installation work of first beam under floor beam)
The first partition lower floor beam is attached to the floor opening 16 of the floor FL at a position slightly spaced from the edge of the existing floor 15 of the unit (first lower floor beam). This is the work of installing the floor beam.

That is, the first partition wall W1 and the second partition wall W2 for partitioning the bathroom are erected at the installation position of the bus unit BU as shown in FIG. In order to support the second partition wall W2, the first partition lower floor beam 21 is installed at a lower position thereof.
The first partition lower floor beam 21 includes a metal channel-shaped main body 21a and a wooden crosspiece 21b fixed to the upper surface of the main wall 21a by screws or the like along the main body 21a. And the attachment brackets 21c and 21c couple | bonded with the longitudinal direction both ends of the main body 21a of the 1st partition lower floor beam 21 are fastened to the floor beam girder 11. FIG.

  Further, as shown in FIG. 6, a small beam support bracket 23 is attached to the main body 21 a on the side surface facing the floor gable large beam 12. This beam support bracket 23 is for supporting a second partition lower floor beam (second beam lower beam) 22 which will be described later, and as shown in FIG. 11, both sides of the horizontal support plate 23a. The side plates 23b and 23b are raised from the top and formed in a U-shaped cross-sectional shape opened upward.

(Installation work of Tsumagogi reinforcement member)
As shown in FIG. 6, the end-to-end beam reinforcing member mounting operation is performed on the end-to-end beam beam 12 to support a later-described end beam member 60 and a second partition lower floor end beam 22 (see FIG. 9). It is work to attach.

The wife large beam reinforcing member 30 includes a metal base member 31, receiving metal support brackets 32 and 32, and a small beam support bracket 33.
The base member 31 is formed in an L-shaped cross-sectional shape that can follow the lower flange 12a and the side plate 12b of the floor girder 12 having a C-shaped channel shape.
The bracket support bracket 32 is a bracket for attaching a beam support 50 (see FIG. 8) for supporting the beam member 60 described later. The bracket support bracket 32 protrudes from the base member 31 in the horizontal direction and is integrated by welding or the like. Are combined. The bracket support bracket 32 is formed in an inverted U-shaped cross section by a pair of side plates 32a and 32a and an upper plate 32b connecting the upper ends of the side plates 32a and 32a.
The beam support bracket 33 is a bracket for supporting a second partition lower floor beam 22 which will be described later, and as shown in FIG. It is formed in a U-shaped cross section opening upward.
The beam support bracket 33 is disposed to face the beam support bracket 23 described above in the horizontal direction.

  As shown in FIG. 7, the end-face beam reinforcing member 30 is coupled to the floor end-end beam 12. For this connection, it is preferable to use a fastener that can be prepared by drilling pilot holes in advance at a plurality of locations on the base member 31 and fastening it by one of the operations called ST lock. Note that a sheet-like spacer 39 is interposed between the base member 31 and the lower flange 12a of the floor girder 12 (see FIG. 6).

(Girder beam reinforcement member installation work)
As shown in FIG. 7, the beam beam reinforcing member mounting operation is a task of mounting a pair of beam beam reinforcing members 40 for supporting the beam members 60 described later on the floor beam beams 11 and 11.

The girder beam reinforcing member 40 includes a metal base member 41 and three metal support brackets 42, 42, 42.
The base member 41 is formed in an L-shaped cross-sectional shape that can follow the lower flange 11a and the side plate 11b of the C-shaped channel-shaped floor girder beam 11.
The support bracket support bracket 42 is integrally coupled by welding or the like, and is formed in an inverted U-shaped cross section by a pair of side plates 42a and 42a and an upper plate 42b that connects the upper ends of the side plates 42a and 42a. . The pair of girder beam support members 40 are arranged so that the respective bracket support brackets 42 face each other in the direction along the floor girder beam 12 according to the installation position of the beam members 60 described later.

  The girder beam reinforcing member 40 is preferably joined to the floor girder beam 11 by using a fastener that has holes prepared in advance at a plurality of locations on the base member 41 and can be fastened by one operation called ST lock or the like. . A sheet-like spacer 49 is interposed between the base member 41 and the lower flange 11a of the floor beam girder 11.

(Installation work of small beam bracket)
The small beam bracket mounting operation is an operation of mounting the small beam bracket 50 for supporting the small beam member 60 to the bracket support brackets 32 and 42 of the reinforcing members 30 and 40, respectively.

  As shown in FIG. 8, the small beam receiving bracket 50 has side flanges 52, 52 raised on both sides of a Z-shaped steel base 51, and box-shaped upper receiving portions on the upper back side and lower front side of the base 51. 53 and a lower receiving portion 54 are formed.

That is, the base 51 includes an upper flange 51a that covers the upper surfaces of the upper plates 32b and 42b of the bracket support brackets 32 and 42, and a leg plate 51b that is bent substantially perpendicularly from the upper flange 51a and extends downward. The lower flange 51c is bent from the lower end portion of the leg plate 51b to the front side at a substantially right angle to receive the small beam member described later.
The side flanges 52 and 52 are coupled to the side edge of the leg plate 51b and are coupled to both side edges of the upper flange 51a and the lower flange 51c.
Therefore, as shown in an enlarged view in FIG. 8, a box-like shape is formed by a leg plate 51b, a lower flange 51c, and left and right side flanges 52, 52 at the lower end portion on the surface side of the leg plate 51b. A lower receiving portion 54 surrounded by is formed.
Similarly, an upper receiving portion surrounded by a box shape by a leg plate 51b, an upper flange 51a, and left and right side flanges 52, 52 is provided at the upper end portion of the rear surface of the leg plate 51b. 53 is formed.

  When attaching such a small beam bracket 50 to the bracket support brackets 32, 42 of the reinforcing members 30, 40, the upper flange 51a is connected to each bracket support bracket 32 as shown in an enlarged manner in FIG. The upper receiving portion 53 is attached to the outer periphery of each of the bracket support brackets 32, 42 so as to be covered from the upper side of the brackets 42, and is fastened and fixed by a fastening material.

(Beam member installation work)
In the small beam member attaching operation, the small beam member 60 and the second partition lower floor small beam 22 shown in FIG. 9 are attached to the skeleton member 10.
As shown in FIG. 10, the beam member 60 is made of metal and has a rectangular cylindrical shape. Further, among the three small beam members 60, the small beam member 60 installed in the vicinity of the floor girder large beam 12 is provided with a coupling receiver 63 protruding in the direction of the floor gable large beam 12.

Each beam member 60 has both longitudinal ends thereof placed on the lower flange 51c at the lower receiving portion 54 of the beam receiving metal fitting 50, and a fastener such as a bolt is used from above the notch portion 64. Fastened to the beam support 50 and fixed.
The small beam member 60 installed in the vicinity of the floor gable large beam 12 is connected to the adjacent small beam member 60 by the connecting small beam 65.

  Similarly to the small beam member 60, the second partition lower floor beam 22 is made of metal and is formed in a square tube shape, and both ends in the longitudinal direction are attached to the small beam support brackets 23 and 33 such as bolts. Coupled using fasteners.

(Floor joist installation work)
The floor joist attaching operation is an operation of spanning the first additional joist 24a and the second additional joist 24b between the partition lower floor beams 21 and 22 and the floor girder beam 11 and the floor beam 13.
That is, the first additional joist 24a is disposed in contact with the existing floor joist 14, and is spanned and fixed between the first partition lower floor beam 21 and the floor beam 13 adjacent thereto. .

  Similarly to the first partition lower floor beam 21, the second partition lower floor beam 22 has a wooden crosspiece 22 b fixed to the upper surface thereof. The second additional floor joists 24b are spanned and fixed between the second partition lower floor beam 22 and the floor beam girder 11.

(Floor insulation installation work)
The floor heat insulating material installation operation is an operation of installing plate-like floor heat insulating materials 71a and 71b in the floor opening 16 at a position below the floor surface as shown in FIG.

  In other words, in the present embodiment, as shown in FIG. 15, an additional floor newly added adjacent to the installation area SU so as to be continuous with the existing floor FL is provided in the floor opening 16. An AFL and a dropped floor DFL at a position lower than the existing floor FL are installed.

The floor heat insulating materials 71a and 71b are installed on the dropped floor DFL and the additional floor AFL.
In this installation, although not shown in detail, a support member (not shown) is extended from the beam member 60 and the second additional floor joist 24b to the height of the lower surface thereof in the horizontal direction. In addition, the floor heat insulating materials 71a and 71b are cut into a shape that matches the planar shape of the space between the beam members 60 and the space between the second additional floor joists 24b, and then disposed in this space. It is installed so that its lower surface is supported by the support material (not shown).
In addition, as the plate-like floor heat insulating materials 71a and 71b, for example, a material obtained by foaming and curing a phenol resin is used.

(Floor installation work)
As shown in FIG. 14, the floor material installation work is performed at the positions of the dropped floor DFL and the additional floor AFL (see FIG. 15) and the installation positions of the first partition wall W1 and the second partition wall W2 (see FIG. 16). The dropped flooring 15b, the first additional flooring 15c, and the second additional flooring 15d are respectively installed.

That is, the dropped floor material 15b is screwed to the beam member 60, the first additional floor material 15c is screwed to the second additional floor joist 24b, and the second additional floor material 15d is screwed to the first additional floor joist 24a. Screw on to.
The second additional flooring 15d is a flooring for supporting the second partition wall W2, and is formed to have a width substantially the same as the thickness of the second partition wall W2.
(Side insulation installation work)
The side heat insulating material installation operation is an operation of installing the side heat insulating material 72 on the side surface of the dropped floor DFL.
In the present embodiment, glass wool that is easily deformable is used as the side heat insulating material 72, and, as shown in FIG. 15, a nailing machine that is laid without gaps over the entire circumference of the side surface of the dropped floor DFL, etc. Use a needle to fix it with a fixture such as a needle. The side heat insulating material 72 is preferably airtight by covering the upper surface with an airtight adhesive tape.

(Piping and flooring airtight work)
Piping and flooring airtight work is performed by drilling holes in the required place of the dropped floor DFL formed as described above, and the gap between the first additional flooring 15c, the gap of the hole by the piping, etc. This is an operation to ensure airtightness by sealing with an adhesive tape (not shown).

(Bus core installation work)
The bus core installation work is an operation of installing the bus unit BU shown in FIG. 16B on the dropped floor DFL. Further, with the installation of the bus unit BU, the partition walls W1 and W2 are installed at positions above the partition lower floor beams 21 and 22.

  In the installed state of the second partition wall W2, the additional floor AFL is included in the entrance space outside the bathroom as shown in FIG. 16 (b).

  The floor structure of the building of the embodiment configured as described above has a floor opening 16 that is opened over the entire width in the direction along the floor girder beam 12 in the skeleton member 10 that forms the skeleton of the building unit UN. Facing the floor opening 16, the beam girder reinforcement member 40 attached to the floor girder beams 11, 11 and the girder beam reinforcement member 30 attached to the floor girder beam 12, the girder beam reinforcement member 40, and the girder beam The beam member 60 supported by the reinforcing member 30 and disposed at a position lower than the existing floor FL is disposed at the end edge of the floor opening 16 and is bridged between the floor beams 11 and 11. The first partition lower floor beam 21 and the floor opening 16 are arranged at a lower height than the existing floor FL, and cross the floor opening 16 in the direction along the floor beam girder 11 so as to cross the tread beam. Between the reinforcing member 30 and the first partition lower floor beam 21 It is supported by the spanning second partition lower floor beam 22 and the second partition lower floor beam 22, spans one end of the floor opening 16, and continues to the existing floor FL along the floor girder beam 11. The floor structure of a building is characterized by comprising a first additional floor material 15c forming the additional floor AFL.

Further, the second partition lower floor beam 22 is supported at both ends in the longitudinal direction by beam support brackets 23 and 33 coupled to the end large beam reinforcing member 30 and the first partition lower floor beam 21. .
Further, a plate-like floor heat insulating material 71b is provided below the first additional floor material 15c.
Then, the dropped floor member 15b is supported by the beam member 60, the dropped floor DFL is formed at a position lower than the existing floor FL, and a floor heat insulating material 71a is provided below the dropped floor DFL. A side heat insulating material 72 is provided between the side edge of the DFL and the floor girder beams 11 and 11 and the floor girder beam 12.
Further, the bus unit BU is supported on the beam member 60 through the floor opening 16.

The building floor structure of the embodiment configured as described above has the following effects.
a) In the floor structure in which the floor opening 16 is provided on the floor FL of the building to form the dropped floor DFL, since the additional floor AFL is set in a part of the floor opening 16, only a part of the floor opening 16 is dropped. Setting as DFL became possible.
Therefore, the degree of freedom in design is improved as compared with the case where only the entire floor opening 16 is dropped into the floor.
Specifically, when a drop-type bus unit BU is installed on the drop-in floor DFL, the degree of freedom of the size of the installed bus unit BU is increased. In addition, as shown in the embodiment, the additional floor AFL can be used by being connected to the entrance space outside the building unit UN where the bus unit BU is installed, and the degree of freedom in design is also improved in this respect. .

  b) Since the first partition lower floor beam 21 and the second partition lower floor beam 22 are installed below the first partition wall W1 and the second partition wall W2, the partition walls W1 , W2 can provide sufficient support strength. Moreover, since the both-partitioned lower floor beams 21 and 22 are directly or indirectly coupled to the floor girders 11 and 11 and the floor girder-beam 12 of the skeleton member 10, both-partitioned lower floor beams 21 and 22 are separated. Support strength can be secured.

  c) The second partition lower floor beam 22 which is the end of the additional floor AFL and supports the first partition wall W1 is disposed at the end of the floor opening 16, and is made of metal and has strength. It was made to support by the beam support brackets 33 and 23 couple | bonded with the wife large beam reinforcement member 30 and the 1st partition lower floor beam 21. For this reason, the support strength by the second partition lower floor beam 22 can be secured.

d) In the dropped floor DFL and the additional floor AFL, which are floors provided in the floor opening 16, floor insulating materials 71a and 71b are installed on the lower surfaces of the dropped floor 15b and the first additional floor 15c, respectively. For this reason, the heat insulation of not only a bathroom but building unit UN is securable.
In addition, the dropped floor DFL is provided with a side heat insulating material 72 between the dropped floor material 15b, which is a side surface portion thereof, and each of the large beams 11, 11, 12 and the first partition lower floor beam 21. For this reason, each heat insulating material 71a, 71b, 72 is spread | laid between the building unit UN and the exterior, and it can be made more excellent in heat insulation.

e) A small beam receiving bracket 50 for supporting the small beam member 60 at a position lower than each of the large beams 11 and 12 is a receiving bracket supporting bracket 32 and 42 that protrudes in the horizontal direction in the reinforcing members 30 and 40. To support.
For this reason, even when a foundation made of concrete or the like is present below each of the large beams 11 and 12, the small beam receiving bracket 50 and the small beam member 60 can be disposed on the inside thereof without interfering with the foundation.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment, In the range which does not deviate from the summary of this invention, a various deformation | transformation and substitution can be added.

  For example, in the embodiment, the unit building formed by combining the building units as the building is illustrated, but the building can be applied to a building other than the unit building.

  In the embodiment, the example in which the bus unit is installed on the dropped floor is shown. However, the present invention is not limited to the one in which the bus unit is installed. It may be applied to

  Further, the first partition lower floor beam may be installed below the edge of the existing floor, and in this case, setting of the second additional floor material is not necessary.

  Further, the shape and number of the beam members are not limited to those shown in the embodiment, and may be arbitrarily set.

  Moreover, although the 1st and 2nd partition lower floor beam was shown below the partition wall as the 1st and 2nd lower floor beam, each of these lower floor beams is an edge of the existing floor Or as long as it supports an additional flooring, you may not support a partition wall.

DESCRIPTION OF SYMBOLS 10 Frame member 11 Floor girder beam 12 Floor girder beam 15 Floor material 15b Dropping floor material 15c First additional floor material 16 Floor opening 21 First partition lower floor beam (first lower floor beam)
22 Second partition lower floor beam (second lower floor beam)
23 Beam support bracket 30 Tsum beam support member 33 Beam support bracket 40 Girder beam support member 50 Beam support 60 Beam member 71a Floor insulation 71b Floor insulation 72 Side insulation AFL Additional floor BU Bus unit DFL Dropping Floor FL Floor H Unit building

Claims (6)

A pair of floor girder beams and a pair of floor girder beams installed on the skeleton members forming the skeleton of the building,
In the floor, a floor opening that is a part of the floor in a direction along the floor girder beam from one of the pair of floor beams, and is opened over the entire width in the direction along the floor beam.
Facing the floor opening, the beam girder reinforcing member attached to the pair of floor girder girder and the wife girder reinforcing member attached to the floor girder girder,
A beam member supported by the beam beam reinforcement member and the end beam reinforcement member and disposed at a position lower than the floor;
The first lower floor joists that bridged between the floor girder girders at a height between the floor openings of the external existing floor side edges smell Te of the existing floor and the small beam member When,
The floor opening is disposed at a height substantially equal to the first lower floor beam between the existing floor and the beam member , and crosses the floor opening in a direction along the floor girder beam. A second lower floor beam spanned between the wife large beam reinforcing member and the first lower floor beam;
An additional floor material that covers a part of the floor opening, is supported by the second lower floor beam, and forms an additional floor continuous with the existing floor in a direction along the floor beam girder;
Bei to give a,
The wife large beam reinforcing member includes a beam supporting bracket that supports the second lower floor beam, and a receiving beam that supports the beam member at a position lower than the second lower floor beam through a beam receiving bracket. A building floor structure comprising a bracket support bracket . The building floor structure according to claim 1, wherein the second lower floor beam and the beam members are arranged orthogonally. The second lower floor beam is supported at both ends in the longitudinal direction by a beam support bracket coupled to the end beam beam reinforcing member and the first lower beam beam, respectively. The floor structure of the building of Claim 1 or Claim 2 . The floor structure of a building according to any one of claims 1 to 3, wherein a floor heat insulating material is provided below the additional floor material. The dropped floor material is supported by the beam member, and the dropped floor is formed at a position lower than the floor,
A floor insulation is provided under the dropped flooring,
The building floor structure according to claim 4 , wherein a side heat insulating material is provided between a side edge of the dropped floor and the floor girder girder and floor gable girder. The building floor structure according to any one of claims 1 to 5 , wherein a bus unit is supported by the beam member through the floor opening.