JP2009299289A - Building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building improved in thermal insulation performance of a contact section of a steel frame beam and a floor slab and around the contact section. <P>SOLUTION: This building is provided with the floor slab, the steel frame beam supporting the floor slab, an external wall supported on the steel frame beam by opposing to one side face of the steel frame beam, and a heat insulating structure at each story provided along the external wall and the steel frame beam to insulate heat at the story just below the floor slab. The heat insulating structure at each story is provided with a first heat insulating part provided on the opposite side to the external wall for the steel frame beam and opposing to an upper end part of the steel frame beam and a second heat insulating part connected with the first heat insulating part and provided from a side face to a lower face of the steel frame beam and along the external wall. The first heat insulating part is sandwiched between the second heat insulating part and the floor slab and is extended in the direction for leaving the steel frame beam along a lower face of the floor slab. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a building such as an assembly house.

In a building represented by a house, a heat insulating material is filled for the purpose of improving energy efficiency by improving heating efficiency and cooling efficiency. In wooden houses, the pillars and beams that make up the frame have some heat insulation, so it is possible to obtain an effect just by filling the insulation between the pillars and beams, but in steel houses, the pillars and beams are expensive. Insulation cannot be expected.
That is, in steel-framed houses, it is common to use ALC (Lightweight Aerated Concrete) panels as the outer wall material, and the building is defined by the heat insulating properties of these ALC panels and the heat insulating material filled between columns and beams. Has a heat insulating effect. However, since the beams and columns are made of iron material having a high thermal conductivity, there is a problem that the beams and columns supporting the outer wall become a heat bridge that becomes a heat transfer path indoors and outdoors.
In particular, the beam on the intermediate floor supports the floor slab and is generally formed of H-shaped steel, so that the way of storing the heat insulating material becomes more complicated than other parts, and thus the heat insulation around the beam is improved, for example, There was a risk of lowering than the wall surface portion (general portion) below the beam.

In order to solve such a problem, for example, in Patent Document 1, in a steel frame housing, a small end surface of a plate-like heat insulating material is formed in a step shape, and the heat insulating material is fitted into a side surface of a steel beam made of H-shaped steel. The structure which covers the side surface of a steel beam with a heat insulating material by this is disclosed.
Japanese Patent Laid-Open No. 11-172801

However, in the configuration disclosed in the above-mentioned Patent Document 1, since the bottom slab lower surface is supported on the upper flange of the steel beam H-shaped steel, the heat transfer from the upper flange to the floor slab is performed. It is conceivable that a path is formed, and not only the contact portion between the upper flange of the beam and the floor slab but also the heat insulation around the contact portion is impaired.
Then, an object of this invention is to provide the building which improved the heat insulation of the contact site | part of a steel beam and a floor slab, and its circumference | surroundings.

As a specific means for solving the above problems, the building according to the present invention is:
(1) A floor slab, a steel beam supporting the floor slab, an outer wall supported by the steel beam facing one side of the steel beam, and provided along the outer wall and the steel beam. With each floor heat insulation structure that insulates the floor directly under the floor slab,
Each of the floor heat insulating structures is provided on the opposite side of the steel beam from the outer wall and is opposed to the upper end of the steel beam, and is connected to the first heat insulating unit and is connected to the first heat insulating surface from the side surface of the steel beam. And a second heat insulating portion provided along the outer wall, and the first heat insulating portion is sandwiched between the second heat insulating portion and the floor slab and along the lower surface of the floor slab. It is characterized by extending in a direction away from the steel beam.

  According to this, since the contact part of the steel beam and the floor slab is covered with the first heat insulating part by providing the first heat insulating part at the contact part of the steel beam and the floor slab, the contact part This improves the heat insulation. In addition, since the first heat insulating portion extends in a direction away from the steel beam while being sandwiched between the second heat insulating portion and the floor slab, the lower surface of the floor slab is covered by the first heat insulating portion. It will be. As a result, even if a heat transfer path is formed in which the floor slab comes into contact with the steel beam to form a space below the steel beam → floor slab → floor slab (hereinafter also referred to as the underfloor space), the floor slab and the underfloor space A 1st heat insulation part will interpose between this, and the reduction | decrease of the heat insulation performance by formation of the said heat-transfer path | route will be suppressed remarkably by this.

(2) Further, the steel beam is an H-shaped steel formed by connecting upper and lower flanges with a web, and the first heat insulating portion is directed to a main body portion provided along a lower surface of the floor slab and the web. It is preferable that the second heat insulating portion is in close contact with either or both of the protruding portion of the first heat insulating portion and the main body portion.
According to this, a 1st heat insulation part can be reliably clamped by a 2nd heat insulation part and a floor slab. Moreover, the protrusion amount toward the underfloor space of the second heat insulating portion can be suppressed.

(3) The second heat insulating portion includes a plate-shaped web heat insulating body provided in a state along the web of the steel beam, and the web heat insulating body allows one side portion to enter between the upper and lower flanges. In addition, it is preferable that the other side portion is provided in a state of protruding in a direction away from the outer wall from the end portions of the upper and lower flanges.
According to this, between the end of the upper flange of the steel beam and the underfloor space, not only the first heat insulating part but also the web heat insulator of the second heat insulating part is located. The heat transfer path serving as the underfloor space is blocked by these two heat insulating portions, and the heat insulating performance can be improved more effectively.

(4) The first heat insulating portion is formed in a flat plate shape, and the thickness t _bm is set within the range defined by the following formula (1), and the extending length l _bm from the end of the steel beam is set to It is preferable to be within the range defined by the following formula (2).
10 ≦ t _bm (1)
50 ≦ l _bm (2)
However, the unit is mm.
By disposing the first heat insulating portion having the size in the above range, it is possible to appropriately suppress the deterioration of the heat insulating performance around the steel beam.

(5) Moreover, it is preferable that the said 1st heat insulation part is formed with the hard plastic type heat insulating material.
According to this, a 1st heat insulation part can be formed in plate shape, and the installation with respect to a steel beam and the clamping by a 2nd heat insulating material and a floor slab can also be performed easily.
Note that the hard plastic heat insulating material indicates polyethylene foam B, foamed polyethylene, phenol resin foam, beaded polystyrene foam, extruded polystyrene foam, and the like.

(6) Furthermore, a base layer serving as a base of the floor surface is formed on the top surface of the floor slab, and the base layer is a lower end of the second heat insulating portion of each floor heat insulating structure on the floor directly above the floor slab. A plate-like intermediate material extending in a direction in contact with the portion and separating from the second heat insulating portion, and a base material laid in a state adjacent to the intermediate material,
The intermediate material is formed of a material having a thermal conductivity smaller than at least the floor slab, and the base material is formed of a material having a thermal conductivity equal to or higher than that of the floor slab. preferable.
According to this, since the heat insulation performance above the floor slab can be improved, the heat insulation effect can be obtained in a well-balanced manner with respect to any space above and below the floor slab, and the steel beam that supports the floor slab It is possible to improve the overall heat insulation performance around.

  According to the building of this invention, the contact part of a steel beam and a floor slab and the heat insulation of the circumference | surroundings are improved.

Hereinafter, based on FIG.1 and FIG.2, it demonstrates in detail about the form which implemented this invention.
As shown in FIG. 1, a building according to the present invention includes a foundation 10, a structural housing 11 assembled on the foundation 10, an outer wall 12 supported by the structural housing 11, and the outer wall 12 and the structural housing 11. It is an assembly house on the second floor above ground that is formed with a heat insulating structure 13 provided.

The foundation 10 is formed as a cloth foundation made of reinforced concrete having the same cross section continuous in the length direction of the outer wall 12 and the partition wall.
The structural frame 11 includes a steel column (not shown) standing on the foundation 10, a steel beam 14 spanned between the steel columns, and a floor slab 15 supported by the foundation 10 and the steel beam 14. The steel frame brace structure is formed. Moreover, the structure which installs an earthquake-resistant element (illustration omitted) between steel columns is also employable.
The steel column is formed by a steel square pipe or by attaching a column head member or a column base member to an end of the square pipe. The seismic element is formed by connecting a pair of square pipes with braces or a damping frame.

The steel beam 14 is formed of a so-called H-shaped steel formed by including a pair of upper and lower flanges 14a and 14b and a web 14c connecting between the center portions of the flanges 14a and 14b. It is connected and supported to the steel column via
The thermal conductivity λ of the steel material forming the steel beam 14 is usually about 53.0 W / mK.
Further, the connection between the steel column, the joint piece, and the steel beam 14 is made by mechanical means (not shown) such as high-strength bolt joining, and this eliminates the welding joint regardless of the skill of the operator. The quality of the bonded part is constant.

The floor slab 15 includes a first floor slab 15a, a second floor slab 15b, and a roof slab 15c, and is formed by laying a plurality of flat floor panels made of lightweight cellular concrete (ALC). The floor panel forming the first floor slab 15a is installed in a state where the end is placed on the upper surface of the foundation 10. Further, the floor panels forming the second floor slab 15b and the roof slab 15c are rigid floor hardware (not shown) attached to the steel beam 14 with the ends thereof placed on the upper surface of the upper flange 14a of the steel beam 14. ) Through the steel beam 14.
These floor panels usually have a thickness of 75 mm to 100 mm, and the lightweight cellular concrete is not particularly limited, but typically has a thermal conductivity of about 0.17 W / mK. Can be used.
In this embodiment, lightweight cellular concrete having a thickness of 100 mm and a thermal conductivity of 0.17 W / mK is used.

The outer wall 12 includes a first-floor outer wall 12a and a second-floor outer wall 12b, and is formed by arranging a plurality of flat-walled lightweight cellular concrete (ALC) outer wall panels.
Each outer wall panel has a height corresponding to at least the height of each floor from the lower surface of the floor slab 15 (15a, 15b) of each floor to the upper surface of the upper flange 14a of the steel beam 14. In addition, as shown in FIG. 2, the outer wall panels of each floor are steel beams through various support hardwares 16 such as a self-weight bracket and a Inazuma plate attached to the steel beam 14 and the foundation 10 so as to protrude toward the outer wall panel. The upper and lower ends are supported by 14 and the foundation 10.
In addition, the said outer wall panel also has the performance similar to the said floor panel made from ALC. In this embodiment, lightweight cellular concrete having a thickness of 75 mm and a thermal conductivity of typically 0.17 W / mK is used.
As described above, the floor slab 15 and the outer wall 12 formed of lightweight cellular concrete are lightweight and have good heat insulation performance.

In addition, a gap is formed above the steel beam 14 at a position between the floor slab 15 supported by the steel beam 14 and the lower end of the outer wall 12 on the second floor facing the floor slab 15. Yes. The gap is a space for attaching various support hardware 16 such as the above-mentioned hard floor hardware, self-weight receiving hardware and Inazuma plate to the beam, and mortar 17 is filled after these various hardware, floor slab 15 and outer wall 12 are installed. The
Note that the thermal conductivity of the mortar is usually about 1.5 W / mK.

The heat insulating structure 13 includes a first floor heat insulating structure 13a provided along a steel beam 14 supporting the first floor outer wall 12a and the second floor slab 15b, and a steel beam 14 supporting the second floor outer wall 12b and the roof slab 15c. A second-floor heat insulating structure 13b provided, a roof heat-insulating structure 13c provided on the roof slab 15c, and a floor heat-insulating structure 13d provided on the first-floor floor slab 15a are provided.
Each floor heat insulating structure 13a, 13b is provided on the opposite side to the outer wall 12a, 12b with respect to the steel beam 14, and is connected to the first heat insulating portion 18 and a first heat insulating portion 18 facing the upper end of the steel beam 14. And a second heat insulating portion 19 provided from the side surface to the lower surface of the steel beam 14 and along the outer walls 12a and 12b.

The second heat insulating portion 19 includes an outer wall heat insulator 19a provided along the outer walls 12a and 12b, and an indoor side of the lower flange 14b from the lower surface of the lower flange 14b of the steel beam 14 continuously to the outer wall heat insulator 19a. A creeping flange heat insulator 19b provided around the end portion of the steel plate, and a creeping web heat insulator 19c standing on the flange heat insulator 19b and facing the web 14c of the steel beam 14.
The exterior wall heat insulator 19a is made of a hard urethane foam, an extruded polystyrene foam heat insulating plate, a molded body such as a phenolic resin foam or a foam, etc. "Explanation of energy conservation standards for houses" (issued by the Building Environment and Energy Conservation Organization (No. 1) 1st edition: issued on June 1, 2002) It is composed of various heat insulating materials defined in “Foamed plastic heat insulating materials” on pages 137 to 138, and has a small edge at the bottom. Is placed on the floor slab 15 on the lower floor or the mortar 17 between the floor slab 15 and the outer wall 12 to stand along the outer wall 12, and the small edge at the upper end is the lower surface of the lower flange 14 b of the steel beam 14. Are provided between the floor slab 15 and the steel beam 14.

In the present embodiment, the main exterior wall heat insulator 19a is made of a phenol resin foam. Specifically, the present applicant has already developed an international application (Japanese Patent Application No. 2000-558158). The technology related to this technology (Neoma Foam (registered trademark)) is used. The phenol resin foam according to the technology can be preferably used as a heat insulating material, and can also be preferably used as an airtight material.
Phenolic resin foam according to the above techniques, a phenolic resin base part, and a bubble portion formed from a large number of fine bubbles, the density is phenolic foam to ^{10kg / m 3 ~100kg / m 3} . The phenol resin foam has fine bubbles containing hydrocarbons and an average cell diameter in the range of 5 μm to 200 μm, and the cell walls of most of the fine bubbles are constituted by a smooth phenol resin substrate surface. . Despite the fact that the foaming agent is a hydrocarbon, it has a thermal conductivity comparable to that of conventional fluorocarbon foaming agents, and there is no change in the thermal conductivity over time, resulting in a mechanical strength such as compressive strength. Excellent and improved brittleness.

The above-mentioned phenol resin foam has high heat insulating properties and airtightness, and has the property of maintaining these performances for a long period of time. The heat insulation in the phenol resin foam can be ensured by keeping the bubble diameter as small as 5 μm to 200 μm, preferably as small as 10 μm to 150 μm, and keeping the closed cell ratio as high as 80% or more. . In addition, the phenol resin foam has high combustion resistance, and when the flame acts, the surface is carbonized, so that no ignition occurs and no gas is generated.
For example, when the density of the phenol resin foam is set to 27 kg / m ³ , the thermal conductivity at 20 ° C. is 0.02 W / m · K, the compressive strength is 15 N / cm ² , and the thermal deformation temperature is 200 ° C.

By the way, three types of extruded polystyrene foam heat insulating plates have a thermal conductivity of 0.028 W / m · K, a compressive strength of 20 N / cm ² , a heat distortion temperature of 80 ° C., and two types of rigid urethane foam have a thermal conductivity. Rate: 0.024 W / m · K, compressive strength: 8 N / cm ² , heat distortion temperature: 100 ° C. Therefore, the phenol resin foam has sufficiently higher performance than these three types of extruded polystyrene foam heat insulating plates and two types of rigid urethane foam. For this reason, a heat insulating material made of a phenol resin foam can exhibit substantially the same heat insulating performance with a thickness of about 2/3 that of conventional extruded polystyrene or rigid urethane foam.
Moreover, since a phenol resin foam is a comparatively brittle material, it is common to provide the protective layer which consists of a kraft paper or a nonwoven fabric at least on one side. In particular, the phenol resin foam laminate disclosed in Japanese Patent Application Laid-Open No. 11-198332, which has been developed and patented by the present applicant, has improved adhesive performance by improving the nonwoven fabric forming the protective layer. This nonwoven fabric improves the strength of the phenol resin foam and is provided as a heat insulating material for buildings having excellent strength and heat insulating properties.
In the present embodiment, the neoma foam having a thickness of 25 mm is used as the exterior wall heat insulator 19a.

The downside flange heat insulator 19b is formed by processing polyethylene foam B, and is connected to the flat plate portion 19b1 along the lower surface of the lower flange 14b, the intermediate portion 19b2 protruding from the flat plate portion 19b1, and the intermediate portion 19b2. And a folded portion 19b3 extending in parallel with the flat plate portion 19b1. The folded portion 19b3 faces the flat plate portion 19b1 through a gap formed by the intermediate portion 19b2. By fitting the lower flange 14b of the steel beam 14 into the gap, the lower flange heat insulator 19b is attached to the steel beam 14 so as to cover the lower flange 14b from the lower surface to the indoor side end.
In the present embodiment, the thickness of the downside flange heat insulator 19b is set to 25 mm for all of the flat plate portion 19b1, the intermediate portion 19b2, and the folded portion 19b3. Therefore, when the downside flange heat insulator 19b is attached to the lower flange 14b of the steel beam 14, the intermediate portion 19b2 protrudes 25 mm from the indoor end of the lower flange 14b.

The web-side heat insulation 19c is formed by forming a plate of a phenolic resin foam similar to the outside-wall heat insulation 19a. When the web-side heat insulation 19c is erected on the folded portion 19b3 of the downside flange heat insulation 19b, the steel beam 14 Opposite the web 14c. Further, the height of the creeping web heat insulating body 19c is such that when it stands on the lower flange heat insulating body 19b as described above, a gap with a predetermined interval is formed between the lower surface of the floor slab 15 or the lower surface of the upper flange 14a of the steel beam 14. The size is set to have.
Further, the creeping web heat insulator 19c has one side inserted between the upper and lower flanges 14a and 14b, and the other side is separated from the outer walls 12a and 12b rather than the ends of the upper and lower flanges 14a and 14b. It is provided in a state of projecting.
In this embodiment, the thickness of the creeping web heat insulator 19c is 40 mm, 15 mm of which is accommodated between the upper and lower flanges 14a and 14b of the steel beam 14, and 25 mm is the thickness. These upper and lower flanges 14a and 14b protrude toward the underfloor space.

The first heat insulating portion 18 is formed in a plate shape from the polyethylene foam B, and protrudes toward the main body portion 18 a provided along the lower surface of the floor slab 15 and the web 14 c of the steel beam 14. And a protrusion 18b that covers the lower surface of the upper flange 14a.
The main body 18 a is formed in a flat plate shape and extends along the lower surface of the floor slab 15 in a direction away from the indoor side end of the upper flange 14 a of the steel beam 14.
Here, the thickness _t bm mm of the main body portion 18a as shown in FIG. 2, when the extension設長of the indoor-side end portion of the upper flange 14a of the steel beam 14 and _{l bm,} following equation _{t bm} it is preferably in the range defined in equation (2) below l _bm with the range defined in (1).
10 ≦ t _bm (1)
50 ≦ l _bm (2)
However, the unit is mm.
In the present embodiment, the thickness of the main body portion 18a is set to t _bm = 25 mm, and the extending length is set to l _bm = 200 mm.

Further, since the present embodiment is to aim to suppress a decrease in heat insulating performance due to the heat transfer path between the steel beams 14 and the floor slab 15, in view of the purpose, the unnecessarily t _bm and l _bm Even if it is set to be long, a remarkable effect cannot be obtained, and there is a possibility that the housing with other members may be hindered. Then, the maximum thickness of the main body portion 18a is preferably about _tbmmax = 30 mm, and the maximum length of the _extension is preferably about _lbmmax = 250 mm.
A step portion having a size equal to the plate thickness of the upper flange 14a of the steel beam 14 is formed between the main body portion 18a and the protruding portion 18b, whereby the main body portion 18a is attached to the floor slab 15. When brought into close contact with the lower surface, the protrusion 18b comes into close contact with the lower surface of the upper flange 14a of the steel beam 14. Further, the protrusion length of the protrusion 18b from the main body 18a is at most the size from the end of the upper flange 14a to the connecting portion of the upper flange 14a and the web 14c, and is 48 mm in this embodiment. ing.

  Further, the height of the web heat insulator 19c of the second heat insulating part 19 is such that the projecting part 18b of the first heat insulating part 18 is in contact with the upper flange 14a from the lower end of the projecting part 18b. It is formed slightly larger than the length to the heat insulator 19b. Therefore, in a state where the first heat insulating portion 18 is disposed along the lower surface of the floor slab 15, the web-side heat insulator 19c is turned up between the protruding portion 18b and the main body portion 18a of the first heat-insulating portion 18 and the downside flange heat-insulating body 19b. By pushing between the portion 19b3, the projecting portion 18b of the first heat insulating portion 18 comes into close contact with the upper flange 14a, whereby the first heat insulating portion 18 is brought into contact with the floor slab 15 and the second heat insulating portion 19. It is pinched.

In the present embodiment, the web-side heat insulation 19c is provided in a state where the indoor side surface of the web-side heat insulation 19c is aligned with the indoor side surface of the down-flange heat insulation 19b. Adhesion of an airtight tape for covering an airtight line formed between the flange heat insulator 19b and the side web heat insulator 19c is facilitated.
On the other hand, as shown in FIG. 3, it is possible to provide the outdoor side surface of the web-side heat insulator 19c along the end surface of the folded portion 19b3 of the lower flange heat-insulating body 19b on the web-opposing side. The body 19c opposes the web 14c of the steel beam 14 with a slight gap, and the entire web insulation 19c is accommodated between the upper and lower flanges 14a, 14b of the steel beam 14.

  Moreover, as each heat insulation body of the 2nd heat insulation part 19 of FIG. 2, the hard plastic type heat insulating material which makes heat conductivity 0.02 W / mK-0.06 W / mK, such as a phenol resin, a polystyrene foam, a polyethylene foam, is used. It is possible to adopt as appropriate, and as the first heat insulating portion 18, a hard plastic heat insulating material having a thermal conductivity of 0.02 W / mK to 0.06 W / mK, such as phenol resin, polystyrene foam, polyethylene foam or the like. It is possible to adopt as appropriate.

On the other hand, the upper surface of the floor slab 15 is provided with a base layer 20 for adjusting the height of the second-floor floor surface, and a finishing layer 21 laminated on the base layer 20 to form the floor surface of the living room. Yes.
The underlayer 20 includes an intermediate member 22 laid on the peripheral edge of the floor slab 15 adjacent to the outer wall 12 (12a, 12b), and the floor slab 15 in a state where the end portions of the intermediate member 22 face each other and are adjacent to each other. And a base material 23 laid at the center of the substrate.
In this embodiment, the intermediate member 22 is formed by forming a plate shape with three types of extruded polystyrene foam heat insulating plates (thermal conductivity: 0.028 W / mK). The intermediate material 22 is laid from the upper surface of the mortar 17 filled in the gap to the upper surface of the end portion of the floor slab 15, and the end portion located on the mortar 17 has an outer wall of the second-floor heat insulating structure 13b. It contacts the lower end of the heat insulator 19a. Thereby, the intermediate material 22 is extended in the direction away from the said outer wall insulation 19a.

The intermediate member 22 has a thickness of t _f mm and a length (from the outdoor side edge abutting the exterior wall heat insulator 19a of each floor heat insulating structure 13a, 13b to the indoor side edge) l _f. it is preferably in the range defined in equation (4) below l _f with the range defined in equation (3) below _f.
20 ≦ t _f (3)
100 ≦ l _f (4)
However, the unit is mm.
In this embodiment, the thickness t _f = 20 and the length l _f = 250 mm.
In this embodiment, the base material 23 is a self-leveling material (typically, specific gravity: 2.0, thermal conductivity: 1.5 W / mK) mainly composed of mortar. By pouring toward the center of the floor slab 15 which is the side of the intermediate material 22, the second floor is formed horizontally.

Thus, since the intermediate material 22 is formed of three types of extruded polystyrene foam heat insulating plates and the base material 23 is formed of a self-leveling material, the intermediate material 22 is significantly smaller than the floor slab 15 (floor panel). On the other hand, the base material 23 has a thermal conductivity equal to or higher than that of the floor slab (floor panel) 15.
In view of this point, as the intermediate material 22, in addition to polystyrene foam, a plastic heat insulating material having a thermal conductivity of 0.02 W / mK to 0.06 W / mK, such as phenol resin and polyethylene foam, is appropriately employed. In addition to the self-leveling material, the base material 23 may be a material having a thermal conductivity of 0.15 W / mK to 1.5 W / mK, such as plywood, particle board, asphalt mat, and mortar material. It is possible to adopt as appropriate.

The finishing layer 21 formed on the upper surface of the foundation layer 20 includes a first finishing member 21a laid on the intermediate material 22 and the foundation material 23 of the foundation layer 20, and an upper surface laid on the first finishing member 21a. And a second finishing member 21b that exposes. On the upper surface of the first finishing member 21a, an interior material 24 provided so as to face the exterior wall heat insulator 19a is erected, and the second finishing member 21b is more than the interior material 24 of the first finishing member 21a. It covers the area on the indoor side.
The first finishing member 21a and the second finishing member 21b are formed of plywood, synthetic wood, particle board, plastic heat insulating material, flooring material, and the like, each having a thickness of 9 mm to 30 mm. Yes.
In the present embodiment, the finishing layer 21 is configured with a 12 mm thick plywood as the first finishing member 21 a and a 13 mm thick flooring material as the second finishing member 21 b.

  The present embodiment is configured as described above. According to the present embodiment, as shown in FIG. 2, the outer wall panel constituting the outer wall 12a on the first floor and the outer wall panel constituting the outer wall 12b on the second floor as shown in FIG. A supporting metal 16 such as a self-weight receiving metal or a Inazuma plate provided as a heat bridge becomes a thermal bridge, and a heat transfer path is formed from the supporting metal 16 to the steel beam 14 to the inside and outside of the outer walls 12a and 12b. By providing the first heat insulating portion 18 at the contact portion between the beam 14 and the floor slab 15, the contact portion between the steel beam 14 and the floor slab 15 and its periphery are covered with the first heat insulating portion 18 from the indoor side. . For this reason, the heat transfer path from the steel beam 14 to the underfloor space (attic or living room) S is blocked by the first heat insulating portion 18, and as a result, the support hardware 16 and the steel beam 14 become a thermal bridge. The temperature change of the underfloor space S due to the above is suppressed. In addition, since the first heat insulating portion 18 extends in a direction away from the steel beam 14 while being sandwiched between the second heat insulating portion 19 and the floor slab 15, the lower surface of the floor slab 15 has the outer wall 12. A region in a predetermined range is covered with the first heat insulating part 18 from the indoor side toward the indoor side. Thus, even if the heat transfer path is formed from the steel beam 14 to the floor slab 15 due to the floor slab 15 coming into contact with the steel beam 14, the first heat insulating portion is provided between the heat transfer path and the underfloor space S. Accordingly, the heat transfer path from the floor slab 15 to the underfloor space S is interrupted, and this also causes the underfloor caused by the support hardware 16 and the steel beam 14 to become a thermal bridge. The temperature change of the space S is suppressed.

Therefore, the 1st heat insulation part 18 interrupts | blocks the heat transfer path | route which becomes the steel beam 14-> underfloor space S, and the heat transfer path | route which becomes the steel beam 14-> floor slab 15-> underfloor space S, The said 1st heat insulation part 18 As a result, the two heat transfer paths from the steel beam 14 to the underfloor space S are interrupted, thereby ensuring the heat insulation of the underfloor space S and thus improving the heat insulation performance of the entire building.
Further, the creeping web heat insulator 19c is provided in a state in which one side is inserted between the upper and lower flanges 14a and 14b and the other side is protruded into the underfloor space S from the ends of the upper and lower flanges 14a and 14b. In addition, since not only the first heat-insulating portion 18 but also the along-web heat insulator 19c are located between the end of the upper flange 14a of the steel beam 14 and the underfloor space S, the steel beam 14 → The heat transfer path serving as the under-floor space S is blocked by these two heat insulating portions, and the heat insulating performance is improved more effectively, whereby the main body portion of the first heat insulating portion 18 is thinned and shortened. Is planned.

Also, on the upper surface side of the floor slab 15, an intermediate material 22 is laid across the floor slab 15 and the mortar 17 in contact with the exterior wall insulator 19 a, and the intermediate material 22 is more than the floor slab 15. Since the thermal conductivity is small, even when a heat transfer path is formed as steel beam 14 → floor slab 15 → floor space U, it is between the heat insulation path and the room space on floor slab 15. Therefore, the intermediate material 22 is positioned in the middle, and the heat transfer path is interrupted. Similarly, even when a heat transfer path is formed as steel beam 14 → mortar 17 → floor space U, the heat insulating path is also blocked by the intermediate member 22.
Therefore, the second heat insulating portion 19 also blocks the heat transfer path that is the steel beam 14 → the floor slab 15 → the above-floor space U and the heat transfer path that is the steel beam 14 → the mortar 17 → the under-floor space S. Two heat transfer paths from the steel beam 14 to the above-floor space U are blocked by the heat insulating portion 19, thereby ensuring the heat insulation of the above-floor space U and eventually improving the heat insulation performance of the entire building.

Further, the intermediate material 22 is provided only at the peripheral edge of the floor slab 15, and the center portion of the floor slab 15 is covered with the base material 20 having a thermal conductivity larger than that of the floor slab 15. In the central part of the slab 15, there is no possibility that the heat transfer between the floor slab 15 and the floor slab 15 is significantly hindered, so that the energy efficiency of the entire building can be maintained.
Further, the mortar 17 existing between the outer wall 12 and the floor slab 15 has the second heat transfer path 14 → the mortar 17 in addition to the first heat transfer path of the steel beam 14 → the floor slab 15 as described above. Thus, a third heat transfer path such as a steel heat beam 14 → a floor slab 15 → a mortar 17 is formed. However, since the mortar 17 has a thermal conductivity larger than that of the floor slab 15, the heat transfer path is branched into these first to third heat transfer paths, or the second and third heat transfer paths are the first. It can be considered superior to the heat transfer path. For this reason, the amount of heat passing through the first heat transfer path is relatively reduced. Therefore, although the heat insulation is ensured by providing the intermediate material 22 on the first heat transfer path and the floor space U, the temperature change of the floor space U due to the heat transfer by the heat transfer path. Is more suppressed.
Furthermore, since each floor heat insulation structure 13a, 13b and the intermediate material 22 are arranged on the mortar 17, the heat transfer paths from these second and third heat transfer paths to the living room are the floor heat insulation structures 13a, 13b and the intermediate material. 22 is suppressed. Therefore, heat transfer from the steel beam 14 to the floor space U is further suppressed by the above-described heat insulating structure on the floor.

Moreover, when only the structure for the heat insulation of the lower surface side of the floor slab 15 as described above is provided, heat easily flows toward the heat transfer path toward the upper surface side of the floor slab 15, thereby rejecting the heat insulation property of the floor space U. Similarly, if only the structure for heat insulation on the upper surface side of the floor slab 15 as described above is provided, heat can easily flow toward the heat transfer path toward the lower surface side of the floor slab 15, so According to the present embodiment, the first heat insulating portion 18 below the floor slab 15 and the intermediate material 22 above the floor slab 15 are both opened from the outer wall 12 side. It is installed along the inside, and these are opposed to each other via the floor slab 15, whereby the heat transfer path that is the floor slab 15 → the underfloor space S and the heat transfer that is the floor slab 15 → the above-floor space U are performed. Both routes can be suppressed simultaneously. To become. For this reason, there is no risk of causing a decrease in the heat insulation of the other with the improvement of the heat insulation of one of the floor slabs 15 above and below, rather one of them complements the heat insulation performance of the other, The heat insulating effect can be obtained in a well-balanced manner with respect to any of the upper and lower spaces of the floor slab 15.
That is, in the present embodiment, the floor slab 15 is made to have a synergistic effect between the structure for heat insulation on the lower surface side of the floor slab 15 and the structure for heat insulation on the upper surface side of the floor slab 15 by the above-described structure. The overall heat insulation performance around the supporting steel beam 14 is improved, and the heat insulation performance of the entire building is significantly improved.

As mentioned above, although embodiment of the building concerning this invention was explained in full detail, this invention is not limited only to the said embodiment.
For example, although the above embodiment is a two-story detached house, the same effects as those of the above embodiment can be obtained even when the building has three or more floors and the above-described configuration is adopted for each floor.

  The configuration of the present invention is as described above, and in order to confirm the effectiveness of the present invention, the inventors of the present invention have a plurality of thermal insulation structures around and around the steel beam supporting the floor slab on the intermediate floor as shown below. Analysis was performed using the examples.

Analysis 1
<Example>
In the above embodiment, the steel beam 14 has a height of 250 mm, a width of 100 mm (flange thickness 9 mm, web thickness 4.5 mm) (λ _Fe = 53.0 W / mK), and the outer wall 12 has a light weight of 75 mm. The cellular concrete (λ _ALC = 0.17 W / mK) is used, and the floor slab 15 is a lightweight cellular concrete having a thickness of 100 mm. A mortar 17 (λ _mortar = 1.5 W / mK) is provided between the floor slab 15 and the outer wall 12.
Further, the outer wall heat insulator 19a of the second heat insulating portion 19 of each floor heat insulating structure 13a, 13b is made of a neoma foam (λ _NF = 0.020 W / mK) having a thickness of 25 mm, and the subordinate flange heat insulator 19b is made of polyethylene having a thickness of 25 mm. Form B (λ _PE = 0.042 W / mK) is used, and the web insulation 19c is a neoplastic foam having a thickness of 40 mm.
Further, the intermediate material 22 has a thickness of 20 mm, the length from the outdoor side edge to the indoor side edge is 250 mm, _XPS type 3 (λ _XPS = 0.028 W / mK), and the base material 23 has a thickness of 20 mm. And
XPS refers to extruded polystyrene, which is a mixture of a liquefied raw material, a foaming agent and a flame retardant under high temperature and high pressure, and blown into a normal atmospheric pressure / temperature environment at a time. It is a plate-like flame retardant foamed polystyrene that has been cured and cut to a required size, and Styrofoam (registered trademark, trademark owner: The Dow Chemical Company) is well known.
The first heat insulating part 18 is made of polyethylene foam B (λ _PE = 0.042 W / mK), foamed PE (λ _PE = 0.054 W / mK), _XPS 3 type (λ _XPS = 0.028 W / mK), neoma foam ( λ _NF = 0.020 W / mK) is used as the analysis model (I) to (IV), and the thickness t _bm of the main body portion 18a of the first heat insulating portion 18 for each analysis model. the 10mm, 15mm, 20mm, 25mm, with a 30 mm, the extension設長of _{l bm 25mm, 50mm, 75mm,} 100mm, 150mm, 200mm, and analyzing 250mm and the ones respectively.
Also, 20 mm thickness _{t f} of the intermediate member 22, the length (floor heat insulating structure 13a, from contacting the outdoor side end edge in沿外wall insulation 19a and 13b to the indoor-side edge) _{l f} a 250mm particle board of ( λ _PCB = 0.15 W / mK), and the base material 23 is a mortar having a thickness of 20 mm.
Then, the first insulating section 18 and polyethylene foam _{B (λ PE = 0.042W / mK} ) to each analysis model what (V), and the thickness _{t bm} of the main body portion also the analysis model (V) and the applying the extension設長of l _bm to analyze those as described above.

<Analysis software>
As the analysis software, use the thermal bridge calculation software (TB1 for Windows ver.1.0 (Housing and Building Energy Conservation Organization) free software). The thermal bridge calculation software is a program that was developed to determine the effective thermal conductivity and thermal bridge coefficient of walls, ceilings, and floors with thermal bridges such as steel frames. , Reference thermal bridge coefficient, thermal bridge coefficient, (material temperature of each layer) can be calculated.

<Assumptions associated with modeling>
In addition, the dew point temperature measurement position is the entire inner surface of the first heat insulating portion 18 and the second heat insulating portion 19, the joint portion between the first heat insulating portion 18 and the web heat insulator 19c that is supposed to be the lowest temperature, Alternatively, the first heat insulating part 18 and the floor slab 15 (floor ALC) lower surface are closely watched.

<Condition setting and pass / fail judgment>
Under conditions set to be outdoor-4.7 ° C., indoor 15 ° C., and relative humidity 70% rh, it is acceptable if it is 9.7 ° C. or higher at the temperature measurement site, and is rejected if it is lower.
In addition, the setting of the conditions and the acceptance criteria are as follows: "Test guidelines for thermal environment (measures to prevent the occurrence of condensation) based on the results of calculations or experiments (Housing Performance Evaluation Fundamental Liaison Council: determined on April 15, 2004) (Revised on December 20, 2004)) ”and those that fall under the regional classification IV of the guidelines are adopted. In addition, according to the test guideline, the temperature condition of the indoor conditions is 9.6 ° C. as the dew point temperature, and therefore, 9.7 ° C. or higher was accepted in this analysis.

<Analysis results>
FIG. 4A shows the analysis result when the first heat insulating portion 18 is made of polyethylene foam B (analysis model (I)), and FIG. 4B shows the case where the first heat insulating portion 18 is made of foamed PE (analysis). 4 (c) shows the analysis result of the model (II)), FIG. 4 (c) shows the analysis result when the first heat insulating portion 18 is XPS type 3 (analysis model (III)), and FIG. 4 (d) shows the first heat insulation. FIG. 4 (e) shows an analysis result when the part 18 is made of neomafoam (analysis model (IV)), and FIG. 4 (e) shows an analysis result when the intermediate material 22 is made of particle board (analysis model (V)).
4 (a) to 4 (e), it is indicated as “◯” with respect to what is estimated to be acceptable with reference to the result of FIG. 4 (a), and “x” with respect to what is estimated to be unacceptable. .

As is apparent from the analysis result, when more than 50mm together extending設長of _{l bm} to the thickness _{t bm} or more 10 mm, one of the underfloor space S also form a first heat insulating member 18 by the material is 9.7 Confirmed that the heat insulation performance of the entire building was improved by sufficiently suppressing the influence of the thermal bridge despite the fact that the steel beam 14 made of iron became a thermal bridge even if it passed above ℃ Is done.

Analysis 2
<Example>
The same steel beam 14, outer wall 12, floor slab 15, and mortar 17 as in the above embodiment are used.
Further, the first heat insulating portion 18 of each floor heat insulating structure 13a, 13b is made of polyethylene foam B (λ _PE = 0.042 W / mK) having a thickness t _bm = 25 mm and an extended length l _bm = 250 mm, and second heat insulating The creeping flange thermal insulation 19b of the part 19 is made of polyethylene foam B (λ _PE = 0.042 W / mK) with a thickness of 25 mm, and the creeping web thermal insulation 19c is made of neoma foam with a thickness of 40 mm.
Moreover, what makes the outer wall heat insulator 19a a 25 mm thick neoma foam (λ _NF = 0.02 W / mK) is an analysis model (VI), and what makes a 45 mm thick neoma foam is an analysis model (VII). .
In each analysis model (VI) (VII) the intermediate material 22 and be formed by XPS3 species, and, 10 mm thickness _{t f,} 15 mm, 20 mm, 25 mm, with a 30 mm, length (floor heat insulating structure (From the outdoor side edge to the indoor side edge, which is in contact with the outer wall heat insulator 19a of 13a, 13b) l _f is 0 mm, 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm.
When the outer wall heat insulator 19a is made of 25 mm thick neoma foam, the intermediate material 22 overlaps the steel beam 14 by 91 mm, so that the inner side end of the upper flange 14a of the steel beam 14 is overlapped. extending設長of _{l fa} to the _l fa = 0 mm, the composed -39mm, 9mm, 59mm, 109mm, 159mm, and 209 mm. In addition, when the outer wall heat insulator 19a is made of neomafoam having a thickness of 45 mm, the intermediate member 22 overlaps the steel beam 14 by 71 mm, and therefore, from the indoor side end of the upper flange 14a of the steel beam 14 _l fa = 0 mm When the extension設長of _{l fa,} made -19mm, 29mm, 79mm, 129mm, 179mm, and 229 mm.
Furthermore, an analysis model (N) is used for the outer wall insulator 19a having a thickness of 25 mm and λ _NF = 0.02 W / mK and the intermediate material 22 is a particle board (λ _PCB = 0.15 W / mK). and VIII), 10 mm thickness _{t f} of the intermediate member 22, 15mm, 20mm, 25mm, with a 30 mm, length (floor heat insulating structure 13a, outdoor side edge in contact with the沿外wall insulation 19a and 13b karaya Analyzing the case where l _f is 0 mm, 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm (to the inner edge).
When the outer wall heat insulator 19a is made of 25 mm thick neoma foam, the intermediate material 22 overlaps the steel beam 14 by 91 mm, so that the inner side end of the upper flange 14a of the steel beam 14 is overlapped. extending設長of _{l fa} to the _l fa = 0 mm, the composed -39mm, 9mm, 59mm, 109mm, 159mm, and 209 mm.

<Analysis software, modeling assumptions, condition settings, and pass / fail judgment>
This is the same as Analysis 1 above. The dew point temperature measurement position is the entire inner surface of the first heat insulating portion 18 and the intermediate material 22, and the joint portion of the first heat insulating portion 18 and the intermediate material 22 that is supposed to be the lowest temperature, or the intermediate material. No. 22 and the floor base material 23 (mortar) were closely watched on the upper surface.

<Analysis results>
FIG. 5A shows an analysis result when the thickness of the outer wall heat insulator 19a is 25 mm (analysis model (VI)), and FIG. 5B shows that the thickness of the outer wall heat insulator 19a is 45 mm. It is an analysis result in the case of (analysis model (VII)). FIG. 5C shows an analysis result of an analysis model (VIII) in which the intermediate material 22 is formed by a particle board.
5 As is clear from the analysis results of (a), when the both lengths _{l f} and the intermediate material 22 at least the thickness _{t f} 15 mm or more to adopt more than 100 mm, the temperature of the floor space U 9.7 Confirmed that the heat insulation performance of the entire building was improved by sufficiently suppressing the influence of the thermal bridge despite the fact that the steel beam 14 made of iron became a thermal bridge even if it passed above ℃ Is done.
Further, in order to make the intermediate member 22 thin or short, it is preferable to form the outer wall heat insulator 19a to a thickness of at least 45 mm or more, so that, as is clear from the analysis result of FIG. Even when the thickness t _f of the material 22 is set to 10 mm or more and the length l _{f is set} to 50 mm or more, the space U on the floor becomes 9.7 ° C. or more, which is passed. It is confirmed that the heat insulation performance of the entire building is improved by sufficiently suppressing the above.

  In addition, the analysis model (VI) and the analysis model (VIII) differ only in the material of the intermediate material 22 on the floor slab. Compare these analysis results of FIG. 5 (a) and FIG. 5 (c). Then, although the thermal conductivity of the particle board is significantly larger than that of XPS, the temperature of the analytical model (VIII) is lower than that of the analytical model (VI). This is because the heat insulation performance of the floor slab 15 → the above-floor space U is lower than that of XPS because the heat insulation performance of the particle board is lower than that of the XPS. In addition, the heat transfer path from the floor slab 15 to the above-floor space U will be superior, and the heat insulation performance of the underfloor space S will be improved as in the above analysis results, but the heat insulation performance of the above-floor space U will be hindered, and the analysis However, in the analysis model (VIII), the temperature of the floor space U is lower than 9.7 ° C. (The temperature state of the floor space U under the conditions of the analysis model (VIII) is the same as that of the analysis model (V). (Refer FIG.4 (e)). Needless to say, such a tendency becomes remarkable in the configuration in which the intermediate member 22 is not provided.

  That is, from the results of the analysis model (I), the analysis model (V), and the analysis model (VIII), the floor slab 15 is moved upward and downward by providing the heat insulating structure as in the present embodiment above and below the floor slab 15. There is no risk of causing a decrease in the heat insulation of the other with the improvement of the heat insulation of one of the spaces, but rather one of them complements the heat insulation performance of the other, so that any of the spaces above and below the floor slab 15 However, it is confirmed that the heat insulation effect can be obtained with a good balance.

It is a sectional side view showing the building concerning a first embodiment of the present invention. It is the sectional side view which expanded and showed the principal part of FIG. It is the same figure as FIG. 2, and is sectional side view which shows the principal part of the building which concerns on 2nd embodiment of this invention. In the table | surface showing the analysis result of the heat insulation effect regarding a 1st heat insulation part especially about the analysis model containing the Example of this invention, (a) is the analysis result of the analysis model (I) using the polyethylene foam B as a 1st heat insulation part, (B) is the analysis result of the analysis model (II) using foamed PE as the first heat insulation part, (c) is the analysis result of the analysis model (III) using XPS type 3 as the first heat insulation part, (d) is The analysis result of the analysis model (IV) using neoma foam as the first heat insulating portion, and (e) the analysis result of the analysis model (V) using particle board as the intermediate material. It is a table | surface showing the analysis result of the heat insulation effect regarding an intermediate material especially about the analysis model containing the Example of this invention, (a) is the analysis result of the analysis model (VI) which made the outer wall insulation thickness 25mm, (b) Is the analysis result of the analysis model (VII) in which the outer wall insulation thickness is 45 mm, and (c) is the analysis result of the analysis model (VIII) using the particle board as the intermediate material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Foundation 11 Structure frame 12 Outer wall 12a First floor outer wall 12b Second floor outer wall 13 Heat insulation structure 13a First floor heat insulation structure 13b Second floor heat insulation structure 13c Roof heat insulation structure 13d Floor heat insulation structure 14 Steel beam 14a Upper flange 14b Lower flange 14c Web 15 Floor slab 15a 1st floor slab 15b 2nd floor slab 15c roof slab 16 support hardware 17 mortar 18 first heat insulating part 18a main body part 18b projecting part 19 second heat insulating part 19a outer wall heat insulating body 19b lower flange heat insulating body 19b1 flat plate part 19b2 middle Part 19b3 Folding part 19c Along the web insulation body 20 Underlayer 21 Finishing layer 21a First finishing member 21b Second finishing member 22 Intermediate material 23 Underlying material 24 Interior material S Underfloor space (space under the slab, attic)
U Floor space

Claims (6)

A floor slab, a steel beam supporting the floor slab, an outer wall supported by the steel beam in a state of being opposed to one side of the steel beam, and provided along the outer wall and the steel beam. With each floor insulation structure that insulates the floor directly below,
Each of the floor heat insulating structures is provided on the opposite side of the steel beam from the outer wall and is opposed to the upper end of the steel beam, and is connected to the first heat insulating unit and is connected to the first heat insulating surface from the side surface of the steel beam. And a second heat insulating portion provided along the outer wall, and the first heat insulating portion is sandwiched between the second heat insulating portion and the floor slab and along the lower surface of the floor slab. A building that extends in a direction away from the steel beam.   The steel beam is an H-shaped steel in which upper and lower flanges are connected by a web, and the first heat insulating portion includes a main body portion provided along a lower surface of the floor slab, and protrudes toward the web so as to have an upper flange. The building according to claim 1, further comprising: a projecting portion that covers a lower surface, wherein the second heat insulating portion is in close contact with either or both of the projecting portion of the first heat insulating portion and the main body portion.   The second heat insulating portion includes a plate-shaped web heat insulating body provided in a state along the web of the steel beam. The web heat insulating body allows one side portion to enter between the upper and lower flanges and the other. The building according to claim 2, wherein the side portion is provided in a state of projecting in a direction away from the outer wall from the end portion of the upper and lower flanges. The first heat insulating part is formed in a flat plate shape, and the thickness t _bm is set within the range defined by the following expression (1), and the extending length l _bm from the end of the steel beam is expressed by the following expression: The building according to any one of claims 1 to 3, wherein the building is within a range defined in (2).
10 ≦ t _bm (1)
50 ≦ l _bm (2)
However, the unit is mm.   The building according to claim 1, wherein the first heat insulating portion is formed of a hard plastic heat insulating material. On the upper surface of the floor slab, a base layer serving as a base of the floor surface is formed, and the base layer is in contact with the lower end portion of the second heat insulating portion of each floor heat insulating structure on the floor immediately above the floor slab. A plate-like intermediate material extending in a direction away from the second heat insulating portion, and a base material laid in a state adjacent to the intermediate material,
The intermediate material is formed of a material having a thermal conductivity smaller than that of the floor slab, and the base material is formed of a material having a thermal conductivity equal to or higher than that of the floor slab. The building according to any one of claims 1 to 5, characterized in that:

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