JP6386968B2 - Thermal insulation structure of building - Google Patents

Description

  The present invention relates to a heat insulating structure of a building.

  In recent years, in order to improve the comfort and energy efficiency of the house, high thermal insulation has been required. And in order to implement | achieve high heat insulation, it replaces the floor heat insulation construction method which constructs a heat insulating material on a floor, and adoption of the basic heat insulation construction method which constructs the heat insulating material which consists of foaming resin etc. in the foundation is activated.

  For example, Patent Document 1 discloses a configuration in which such a basic heat insulation method is applied to a unit type building composed of a plurality of building units. In the thing of patent document 1, the foundation heat insulation is achieved by providing a foundation heat insulating material in the inner surface of a foundation. Moreover, the thing of patent document 1 arrange | positions the floor beam of a building unit along the said floor beam on the foundation. This floor beam is made of channel steel having a U-shaped cross section, and is arranged with the groove portion facing toward the underfloor space.

  Here, in such a configuration, it is necessary to consider that the floor beam does not become a thermal bridge (heat bridge). Therefore, in Patent Document 1, an in-beam heat insulating material made of glass wool is disposed in the groove portion of the floor beam to suppress the floor beam from becoming a thermal bridge.

JP 2012-172437 A

  However, in the above-described configuration in which the heat insulating material in the beam is arranged in the groove portion of the floor beam, the upper and lower flange portions of the floor beam cannot be covered with the heat insulating material in the beam, so that this flange portion may still be a thermal bridge. There is. For this reason, there is a concern about a decrease in heat insulation performance.

  In cold regions, it is assumed that sufficient heat insulation cannot be achieved even by the basic heat insulation method, and further improvement of heat insulation performance is required.

  This invention is made | formed in view of the said situation, and makes it the main objective to provide the heat insulation structure of the building which can aim at the further improvement of heat insulation performance.

  In order to solve the above-mentioned problem, a heat insulating structure for a building according to a first invention includes a foundation, a floor beam provided along the foundation on the foundation, and the floor beam on the floor beam. Applied to a building comprising a joist provided and a floor covering provided on the joist, provided with a foundation heat insulating part provided on an inner surface of the foundation and a lower face side of the floor covering. An underfloor heat insulating part, and a floor beam heat insulating part provided to cover the floor beam from the underfloor space side below the floor material, the floor beam heat insulating part comprising the foundation heat insulating part and the under floor It is characterized by being provided continuously with the heat insulating part.

  According to the present invention, a foundation heat insulation method is employed in which a foundation heat insulating material is provided on the inner side surface of the foundation. And while employ | adopting this basic heat insulation construction method, the underfloor heat insulation part is provided in the lower surface side of the floor surface material. Therefore, the heat insulation performance of the building is greatly enhanced, and sufficient heat insulation can be achieved even in cold regions.

  In addition, in the configuration in which the underfloor heat insulating portion is provided in addition to the basic heat insulating portion, the floor beam heat insulating portion that covers the floor beam from the underfloor space side is provided continuously with the basic heat insulating portion and the underfloor heat insulating portion. A heat insulating line (heat insulating layer) in which these three heat insulating portions (base heat insulating portion, floor beam heat insulating portion, and under floor heat insulating portion) are continuous can be formed on the under floor space side of the beam. Thereby, since the whole area in the height direction of the floor beam can be covered with the heat insulation line from the underfloor space side, the floor beam can be reliably suppressed from becoming a thermal bridge. Therefore, the heat insulation performance can be further improved as described above.

  Note that “the floor beam heat insulation part is provided continuously with the foundation heat insulation part” is not only the case where the floor beam heat insulation part is provided in contact with the foundation heat insulation part, but also the floor beam heat insulation part is provided. The meaning also includes the case where it is continuous through the basic heat insulating part and another heat insulating part (heat insulating material). Further, “the floor beam heat insulating portion is provided continuously with the underfloor heat insulating portion” has the same meaning as this.

  The heat insulating structure for a building of a second invention is the heat insulating structure for a building according to the first invention, wherein the floor beam is made of a grooved steel having a groove portion opened to the underfloor space side, and the floor beam heat insulating portion is disposed in the groove portion. A heat insulating part inside the beam and a heat insulating part outside the beam arranged outside the groove part, and the heat insulating part outside the beam is provided continuously to the base heat insulating part and the underfloor heat insulating part. It is characterized by that.

  In this invention, the floor beam heat insulation part is provided with respect to the floor beam which consists of channel steel. In this case, a part of the floor beam heat insulating portion (outside beam heat insulating portion) is provided outside the groove portion of the floor beam, and is continuous with the foundation heat insulating portion and the underfloor heat insulating portion, respectively. As a result, the floor beam can be covered with the above-mentioned heat insulation line including the upper and lower flange portions, so that the floor beam is made of channel steel and the floor beam is surely suppressed from becoming a thermal bridge. Can do. In addition, since the remaining portion of the floor beam heat insulating portion (heat insulating portion in the beam) is disposed in the groove portion of the floor beam, the thickness of the floor beam heat insulating portion can be increased (gage) by the heat insulating portion in the beam. it can. Therefore, in this case, the floor beam is made of channel steel, and the heat insulation performance can be suitably improved.

  The heat insulation structure for a building of the third invention is characterized in that, in the second invention, the heat insulation part in the beam and the heat insulation part outside the beam are formed separately.

  By the way, in the above-described configuration in which a part of the floor beam heat insulating portion (heat insulating portion in the beam) is disposed in the groove portion of the floor beam, for example, the floor beam heat insulating portion is assembled in advance in the groove portion of the floor beam in a manufacturing factory. By doing so, it is possible to reduce work on site. However, in this case, it is necessary to transport the floor beam in a state where a part of the floor beam heat insulating material (outer beam heat insulating portion) protrudes from the floor beam. There is concern that will fall off. On the other hand, if an attempt is made to assemble the floor beam heat insulating portion to the floor beam at the construction site, the floor beam heat insulating portion may be difficult to handle due to the large thickness of the floor beam heat insulating portion.

  Therefore, in the present invention, in view of these points, the in-beam heat insulating portion and the out-beam heat insulating portion are configured separately in the floor beam heat insulating portion. In this case, the heat insulation part in the beam can be assembled in the groove of the floor beam at the manufacturing factory, and the heat insulation part outside the beam can be assembled at the construction site. Therefore, it is possible to prevent the floor beam heat insulation part (heat insulation part in the beam) from falling off from the floor beam during transportation of the floor beam, etc., and in addition, the assembly of the heat insulation material outside the beam on the site can be performed relatively easily. It becomes possible.

  In addition, if the building is a unit-type building that is a combination of multiple building units, a heat insulating part inside the beam is assembled into the groove of the floor beam of the building unit at the unit manufacturing factory, and then the heat insulating part outside the beam at the construction site. Can be assembled. In this case, it is possible to prevent the floor beam heat insulating portion (the heat insulating material in the beam) from falling off when the building unit is transported to the construction site. Moreover, although the work at the construction site is a work that is submerged in the space under the floor, in this case, it is only necessary to assemble the heat insulation part outside the beam, so that the work load can be reduced.

  In the heat insulation structure of a building according to a fourth aspect of the present invention, in the third aspect of the invention, the outer heat insulating portion of the beam has a length in the thickness direction of the foundation larger than that of the heat insulating portion in the beam, and in the thickness direction. It is constituted by a plurality of divided heat insulating materials outside the beam, and each of the heat insulating materials outside the beam and the heat insulating material in the beam constituting the heat insulating portion in the beam are both made of the heat insulating material having the same configuration. To do.

  According to the present invention, since the length in the thickness direction of the foundation in the heat insulation part outside the beam (that is, the thickness of the heat insulation part outside the beam) is made larger than the thickness of the heat insulation part inside the beam, the heat insulation performance can be improved. Can do. Moreover, the heat insulation part outside a beam is comprised by the some heat insulation material outside a beam divided | segmented into the thickness direction, and each of these heat insulation materials outside a beam and the heat insulation material in a beam are the same structures. In this case, since it is possible to share the members with respect to the heat insulating material, it is possible to improve the heat insulating performance while reducing the member cost.

  In the heat insulation structure of a building according to a fifth aspect of the present invention, in any one of the second to fourth aspects of the invention, the outer heat insulating part is an end of the underfloor space in the thickness direction of the foundation. It is formed so that it may be located in the same position as the surface on the underfloor space side or on the underfloor space side.

  According to the present invention, in the foundation thickness direction, the end portion on the underfloor space side of the heat insulation part outside the beam is placed at the same level as the surface of the foundation heat insulation part on the underfloor space side or positioned on the underfloor space side. In this case, since the heat insulation part outside the beam is arranged over the whole area in the thickness direction of the foundation heat insulation part above the foundation heat insulation part, the heat insulation thickness is reduced in the continuous part where the heat insulation part outside the beam and the foundation heat insulation part are continuous. It can avoid becoming small. Thereby, it can suppress that the heat insulation performance falls in the said continuous part.

  The heat insulating structure for a building according to a sixth aspect of the present invention is the heat insulating structure for a floor according to any one of the first to fifth aspects, wherein the under-floor heat insulation is provided between the floor beam and the floor material in the space below the joist on the under-floor space side. The end of the part is inserted, and the end is disposed in contact with the joist.

  According to the present invention, the end portion of the underfloor heat insulating portion enters the gap between the floor beam and the floor material, and the end portion is in contact with the joist. In this case, the underfloor space side of the upper surface of the floor beam is covered from above by the end portion of the underfloor heat insulating portion from the joist, and therefore, heat transfer from the floor beam to the upper side (room side) can be suppressed. Thereby, heat insulation performance can be improved more.

The longitudinal cross-sectional view which shows the structure of the foundation periphery in a building. The perspective view which shows the structure of a building unit. Explanatory drawing for demonstrating the work procedure at the time of constructing a heat insulation structure.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the unit type building constructed by combining a plurality of building units with each other is embodied as a building. First, the configuration of the building unit 20 constituting the unit type building will be briefly described with reference to FIG. FIG. 2 is a perspective view showing the configuration of the building unit 20.

  As shown in FIG. 2, the building unit 20 includes four columns 21 disposed at the four corners thereof, and four ceiling beams 22 and floor beams 23 that connect the upper end portion and the lower end portion of each column 21, respectively. With. A rectangular frame (frame) is formed by the pillars 21, the ceiling beams 22 and the floor beams 23. The column 21 is made of a square tube-shaped square steel. The ceiling girder 22 and the floor girder 23 are made of channel steel having a U-shaped cross section, and are installed so that their openings face each other.

  A plurality of small ceiling beams 25 are bridged between the large ceiling beams 22 on the long sides of the building unit 20 at predetermined intervals. Similarly, a plurality of floor beams 26 are bridged between the large floor beams 23 on the long sides of the building unit 20 at predetermined intervals. The ceiling beam 25 and the floor beam 26 are provided at the same interval and at positions corresponding to the upper and lower sides, respectively. The ceiling beam 25 is made of lip groove steel, and the floor beam 26 is made of square steel.

  Next, the structure around the foundation in the building 10 will be described with reference to FIG. FIG. 1 is a longitudinal sectional view showing a configuration around a foundation in a building 10.

  As shown in FIG. 1, the foundation 11 is made of a reinforced concrete cloth foundation, and includes a footing portion 11 a embedded in the ground and a rising portion 11 b extending upward. The foundation 11 is a so-called outer circumference foundation provided along the outer circumference of the building 10. The inner side surrounded by the foundation 11 (the rising portion 11 b) is an underfloor space 13, and a moisture-proof concrete 15 is placed on the floor foundation board 14 in the underfloor space 13.

  A building unit 20 constituting the building 10 is installed on the rising portion 11 b of the foundation 11. A plurality of building units 20 are installed side by side on the rising portion 11b of the foundation 11, and the building 10 is constructed by connecting the building units 20 to each other in the installed state.

  In the installed state of the building unit 20, the floor beams 23 of the building unit 20 are disposed along the foundation 11 on the rising portion 11 b of the foundation 11. The floor girder 23 is made of channel steel as described above, and has a web part 23a extending in the vertical direction, and an upper flange part 23b and a lower flange part 23c provided on both upper and lower sides across the web part 23a. ing. The inside of the floor girder 23 surrounded by these parts 23a to 23c is a groove 23d, and the floor girder 23 is arranged with the groove 23d facing the underfloor space 13 side. The large floor beam 23 corresponds to the floor beam.

  In a state where the floor girder 23 is installed on the rising part 11b of the foundation 11, a predetermined gap 16 is formed between the upper surface of the rising part 11b and the lower surface of the floor girder 23 (specifically, the lower flange part 23c). Yes. An airtight material 17 is provided in the gap 16. The airtight member 17 is formed in a long shape along the floor beam 23 and is provided so as to close the gap 16. Thereby, the airtight performance of the underfloor space 13 is ensured.

  A joist 18 is provided on the floor girder 23 (specifically, the upper flange portion 23b). The joist 18 is disposed along the floor beam 23, and in the disposed state, the side surface on the underfloor space 13 side is located on the outdoor side of the end portion on the underfloor space 13 side of the upper flange portion 23b. A floor material 19 is provided on the joist 18. The floor surface material 19 is a floor base material made of particle board. A floor finishing material (not shown) is laid on the upper surface of the floor material 19. The floor surface of the living room 28 is formed by this floor finishing material.

  The living room 28 is partitioned from the outside by an outer wall portion 31. The outer wall portion 31 has an outer wall surface material 32 facing the outdoors and an inner wall surface material 33 facing the living room 28. The outer wall surface material 32 is fixed to the outdoor side of the floor girder 23 (specifically, the web portion 23a) via a base frame 34 provided on the back side thereof. Also, an in-wall heat insulating material 35 made of glass wool is provided between the outer wall surface material 32 and the inner wall surface material 33.

  Then, the heat insulation structure constructed | assembled around the foundation in the building 10 is demonstrated.

  In the building 10 of the present embodiment, a basic heat insulation method is employed. That is, the base heat insulating material 37 is provided on the inner surface of the rising portion 11 b of the base 11. The basic heat insulating material 37 is made of foamed polyethylene as a foam heat insulating material. The basic heat insulating material 37 is formed in a plate shape, and is provided in a state where two sheets are stacked on the rising portion 11b. Moreover, the basic heat insulating material 37 is arrange | positioned over the height direction whole region in the standing part 11b. In this case, the upper end portion of the basic heat insulating material 37 is set at the same height as the upper surface of the rising portion 11b. In addition, the basic heat insulation part is comprised by each basic heat insulating material 37 piled up two sheets.

  An underfloor heat insulating material 38 is provided on the lower surface side of the floor surface material 19. The underfloor heat insulating material 38 is made of polyethylene foam as a foam heat insulating material. The underfloor heat insulating material 38 is formed in a plate shape and is provided so as to overlap the lower surface of the floor surface material 19. The underfloor heat insulating material 38 is attached to the floor beam 26 using, for example, a mounting bracket (not shown).

  The thickness of the underfloor heat insulating material 38 is set to the same size as the height dimension (vertical width) of the joist 18. The end of the underfloor heat insulating material 38 enters between the upper surface of the floor beam 23 (upper flange portion 23 b) and the lower surface of the floor surface material 19. The part that has entered is a entering part 38 a, and the entering part 38 a is disposed in contact with (in contact with) the side surface of the joist 18.

  On the upper surface of the rising portion 11b of the foundation 11, a foundation heat insulating material 39 is provided. The base heat insulating material 39 is provided across the upper surface of the rising portion 11 b and the upper surface of the basic heat insulating material 37. The base upper heat insulating material 39 is made of plate-like (thin plate-like) glass wool, and is formed in a long shape along the base 11. A part of the base heat insulating material 39 enters the gap 16 between the rising portion 11 b and the floor beam 23, and the inserted portion is sandwiched in a compressed state between the both 11 b and 23. . Further, the upper heat insulating material 39 has an end on the underfloor space 13 side in the thickness direction of the foundation 11 (hereinafter also simply referred to as a basic thickness direction), and a surface on the underfloor space 13 side in the basic heat insulating material 37 (specifically, the basic heat insulating material). In the material 37, it is in the same position as the plate surface facing the underfloor space 13.

  An in-beam heat insulating material 41 is provided in the groove 23 d of the floor girder 23. The in-beam heat insulating material 41 is made of glass wool as a fiber heat insulating material. The in-beam heat insulating material 41 is formed in a long shape along the floor large beam 23, and is disposed so as to fill the groove 23 d of the floor large beam 23. The cross-section (cross section in the direction orthogonal to the longitudinal direction) of the in-beam heat insulating material 41 has a substantially rectangular shape. The heat insulating material 41 in the beam has a height dimension (vertical dimension) in its natural state (uncompressed state) larger than the height dimension of the floor beam 23, and its thickness (length in the foundation thickness direction) is the floor. It is the same as the width of the large beam 23. In this case, the in-beam heat insulating material 41 is disposed in a state of being compressed up and down in the groove portion 23 d of the floor large beam 23. The in-beam heat insulating material 41 forms an in-beam heat insulating portion.

  A plurality of (specifically, two) outer beam heat insulating materials 42 are provided on the underfloor space 13 side of the large floor beam 23 (and the inner heat insulating material 41). Each of these outer-beam heat insulating materials 42 is made of glass wool as a fiber-based heat insulating material. Each of the heat insulating materials 42 outside the beam is formed in a long shape along the floor large beam 23, and its cross section (cross section in a direction orthogonal to the longitudinal direction) has a substantially rectangular shape. Each of the heat insulating materials 42 outside the beam has the same configuration (specifically, a configuration in a natural state), and further, the configuration thereof is the same as the heat insulating material 41 in the beam. Thereby, in the structure which provided the several heat insulating material in the floor girder 23, the sharing of a member is achieved. In addition, the outside heat insulating part of each beam is constituted by each of these outside heat insulating materials 42.

  The external heat insulating materials 42 are arranged side by side in the foundation thickness direction on the underfloor space 13 side of the internal heat insulating material 41. In this case, each outer-beam heat insulating material 42 and the inner heat-insulating material 41 are arranged in a state of being laminated in the foundation thickness direction. Out of each heat insulating material 42 outside the beam, the heat insulating material 42 outside the beam adjacent to the heat insulating material 41 within the beam (hereinafter, this symbol is a) is provided in contact with the heat insulating material 41 within the beam. Further, the outside-beam heat insulating material 42a is provided in contact with the other outside-beam heat insulating material 42 (hereinafter referred to as “b”). In this case, a floor beam heat insulating portion is constituted by these heat insulating materials 41, 42a and 42b.

  Each of the heat insulating materials 42 a and 42 b outside the beam is disposed between the base heat insulating material 39 and the underfloor heat insulating material 38. Specifically, the outer heat insulating materials 42a and 42b are arranged between the heat insulating materials 38 and 39 in a (slightly) compressed state. In this case, each outer-beam heat insulating material 42a, 42b is in contact with the foundation heat insulating material 39 at the lower end thereof. Therefore, the extra-beam heat insulating materials 42 a and 42 b are continuous with the basic heat insulating material 37 through the upper heat insulating material 39. Moreover, each heat insulation material 42a, 42b is contacting the underfloor heat insulation 38 in the upper end part. Therefore, the outside-beam heat insulating materials 42 a and 42 b are also continuous with the underfloor heat insulating material 38. Thus, in this building 10, the heat insulation line (heat insulation layer) in which each said heat insulating materials 37-39, 42a, 42b continued was formed from the foundation 11 to the floor bottom.

  The surface (side surface) on the underfloor space 13 side of the outside-beam heat insulating material 42 b is located on the same plane as the surface (plate surface) on the underfloor space 13 side of the basic heat insulating material 37. As a result, an outer beam heat insulating portion composed of two outer beam heat insulating materials 42 a and 42 b is disposed over the entire area of the basic heat insulating material 37 in the thickness direction above the basic heat insulating material 37.

  Next, an operation procedure for constructing the above-described heat insulating structure will be described. FIG. 3 is an explanatory diagram for explaining an operation procedure when constructing a heat insulating structure.

  In the unit manufacturing factory, first, each building unit 20 constituting the building 10 is manufactured. When manufacturing the building unit 20, as shown in FIG. 3A, the underfloor heat insulating material 38 is attached to the lower surface side of the floor surface material 19, and the in-beam heat insulating material 41 is disposed in the groove portion 23 d of the floor large beam 23. .

  After the building unit 20 is manufactured, each building unit 20 is transported to a construction site by a truck.

  At the construction site, the foundation 11 is first constructed. When the foundation 11 is constructed, as shown in FIG. 3 (b), the foundation heat insulating material 37 is attached to the inner side surface of the rising portion 11 b of the foundation 11.

  After the foundation 11 is constructed, the building unit 20 transported from the unit manufacturing factory is installed on the foundation 11. When installing the building unit 20, first, as shown in FIG. 3C, the base heat insulating material 39 is disposed on the rising portion 11 b of the foundation 11, and then the building unit 20 is installed on the rising portion 11 b. .

  After installing the building unit 20, as shown in FIG. 3 (d), the work of disposing the outside-beam heat insulating materials 42 a and 42 b between the basic heat insulating material 37 (base heat insulating material 39) and the underfloor heat insulating material 38 is performed. Do. This operation is performed in a state of being submerged in the underfloor space 13.

  As mentioned above, according to the structure of this embodiment explained in full detail, the following outstanding effects are acquired.

  While adopting the basic thermal insulation method in which the basic thermal insulation 37 is provided on the inner surface of the foundation 11 (the rising portion 11b), the thermal insulation performance of the building is greatly enhanced because the underfloor thermal insulation 38 is provided on the lower surface side of the flooring material 19. Therefore, sufficient heat insulation can be achieved even in cold regions.

  Further, in such a configuration, a floor beam heat insulating portion (specifically, a heat insulating material 41 inside the beam and a heat insulating material 42 outside the beam) that covers the floor large beam 23 from the underfloor space 13 side is provided, and the heat insulating portion of the floor beam is fundamentally insulated. The material 37 and the underfloor heat insulating material 38 were made continuous. In this case, a heat insulating line (heat insulating layer) in which the base heat insulating member 37, the floor beam heat insulating portion (specifically, the heat insulating member 42 outside the beam) and the under heat insulating member 38 are continuous may be formed on the underfloor space 13 side of the large floor beam 23. Therefore, the entire area in the height direction of the floor beam 23 can be covered with the heat insulation line from the underfloor space 13 side. Therefore, it is possible to reliably suppress the floor girder 23 from becoming a thermal bridge. Therefore, in this case, the heat insulation performance can be further improved.

  A part of the floor beam heat insulating portion (the heat insulating material 41 in the beam) is disposed in the groove portion 23d of the large floor beam 23, and the remaining portion (the heat insulating material 42 outside the beam) is disposed outside the groove portion 23d. And about the heat insulation material 42 outside a beam, it was made to continue to the base heat insulation material 37 and the underfloor heat insulation material 38, respectively. In this case, since the floor girder 23 can be covered with the heat insulation line including the upper and lower flange portions 23b and 23c, the floor girder 23 is composed of channel steel, and the floor girder 23 becomes a thermal bridge. Can be reliably suppressed. Further, since the in-beam heat insulating material 41 is disposed in the groove portion 23d, the thickness of the floor beam heat insulating portion can be increased. Therefore, in this case, the floor girder 23 is made of channel steel, and the heat insulation performance can be suitably improved.

  The in-beam heat insulating material 41 and the out-of-beam heat insulating material 42 constituting the floor beam heat insulating portion were configured separately from each other. In this case, the in-beam heat insulating material 41 can be assembled to the groove 23d of the floor beam 23 at the unit manufacturing factory, and the external heat insulating material 42 can be assembled at the construction site. Thereby, it can suppress that a floor beam heat insulation part (heat insulating material 41 in a beam) falls off at the time of conveyance to the construction site of the building unit 20. FIG. In addition, although the work at the construction site is a work that is submerged in the underfloor space 13, in this case, since only the extra-beam heat insulating material 42 needs to be assembled, the work burden can be reduced.

  Here, if it is considered that the in-beam heat insulating material 41 and the out-of-beam heat insulating material 42 are integrated to form a floor beam heat insulating portion and assembled to the groove 23d of the floor large beam 23 at the construction site, the work Since the work is performed in a deep position between the base heat insulating material 37 and the underfloor heat insulating material 38, it is considered that the work is extremely difficult. Therefore, even in view of this point, the above-described configuration in which only the heat insulating material 42 outside the beam only needs to be assembled on-site by separating the heat insulating material 41 inside the beam and the heat insulating material 42 outside the beam is preferable. It can be said that it is a composition.

  Since the thickness (length in the direction of the foundation thickness) of the heat insulating portion outside the beam (the entire length of the heat insulating material 42a and 42b outside the beam) is made larger than the thickness of the heat insulating material 41 inside the beam, the entire thickness of the floor beam heat insulating portion can be increased. . Thereby, the improvement of heat insulation performance can be aimed at. Further, the heat insulating portion outside the beam is constituted by a plurality of heat insulating materials 42 a and 42 b outside the beam divided in the thickness direction, and each of the heat insulating materials 42 a and 42 b outside the beam and the heat insulating material 41 inside the beam have the same configuration. In this case, since it is possible to share the members with respect to the heat insulating material, it is possible to improve the heat insulating performance while reducing the member cost.

  In the foundation thickness direction, the end portion (side surface) of the under-beam heat insulating material 42 b on the underfloor space 13 side was set at the same position as the surface of the basic heat insulating material 37 on the underfloor space 13 side. In this case, since the outer heat insulating material 42 (42a, 42b) is disposed over the entire area of the basic heat insulating material 37 in the thickness direction above the basic heat insulating material 37, the outer heat insulating material 42 (42a, 42b) It can avoid that heat insulation thickness will become small in the continuous part where the basic heat insulating material 37 continues. Thereby, it can suppress that the heat insulation performance falls in the said continuous part.

  In the foundation thickness direction, the end portion (side surface) of the under-beam heat insulating material 42b on the under-floor space 13 side may be positioned closer to the under-floor space 13 side than the under-floor space 13-side surface of the basic heat insulating material 37. Even in that case, the above-mentioned effects can be obtained because the extra-beam heat insulating material 42 (42a, 42b) is disposed over the entire area of the basic heat insulating material 37 in the thickness direction above the basic heat insulating material 37. It becomes.

  The entering portion 38 a of the underfloor heat insulating material 38 was inserted between the upper flange portion 23 b of the floor girder 23 and the floor surface material 19, and the entering portion 38 a was brought into contact with the joist 18. In this case, the upper flange portion 23b (the front end side) of the floor girder 23 can be covered from above by the entering portion 38a of the underfloor heat insulating material 38, so that the upper flange portion 23b serves as a thermal bridge and the outdoor heat is transmitted to the floor girder. 23 (in other words, the room 28 side) can be prevented from being transmitted.

  The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

  (1) In the said embodiment, although comprised by the two beam outer heat insulating materials 42 which divided | segmented the beam outer heat insulation part, you may divide | segment into three or more beam outer heat insulating materials 42. FIG. Further, the divided outer heat insulating materials 42 do not necessarily have the same configuration, and the heat insulating material 41 in the beam does not necessarily have the same configuration. Moreover, you may make it provide only one, without dividing a heat insulation part outside a beam.

  (2) In the above embodiment, the in-beam heat insulating material 41 (in-beam heat insulating portion) and the external beam heat insulating material 42 (out-beam heat insulating portion) are configured separately in the floor beam heat insulating portion. Alternatively, a floor beam heat insulating portion in which the beam heat insulating portion and the beam outer heat insulating portion are integrated may be configured. However, considering the handleability of the floor beam heat insulating part, it is desirable to configure the heat insulating part inside the beam and the heat insulating part outside the beam separately.

  Moreover, you may make it not provide the heat insulating material 41 in a beam. Also in that case, since the basic heat insulating material 37 and the underfloor heat insulating material 38 are continuous via the beam outer heat insulating material 42, the heat insulating performance can be improved.

  (3) In the above embodiment, the base heat insulating material 37 and the beam outer heat insulating material 42 are made continuous via the heat insulating material 39 on the foundation. May be continued by directly contacting them without using the heat insulating material 39 on the foundation. Moreover, in the said embodiment, it was made to continue by making the underfloor heat insulating material 38 and the beam outside heat insulating material 42 contact directly, However, This is changed and another heat insulating material is put between these heat insulating materials 38 and 42. Each heat insulating material 38 and 42 may be made continuous through other heat insulating materials.

  (4) In the said embodiment, although the foamed polyethylene (foaming type heat insulating material) was used as the basic heat insulating material 37 and the underfloor heat insulating material 38, you may use other foaming type heat insulating materials, such as a polyethylene foam and a phenol foam. Moreover, as the basic heat insulating material 37 and the underfloor heat insulating material 38, it is not always necessary to use a foam heat insulating material, and a fiber heat insulating material such as glass wool may be used.

  In the said embodiment, although glass wool (fiber type heat insulating material) was used as the heat insulating material 41 in a beam and the heat insulating material 42 outside a beam, you may use other fiber type heat insulating materials, such as rock wool and a cellulose fiber. Moreover, as the heat insulating material 41 in a beam and the heat insulating material 42 outside a beam, a fiber type heat insulating material does not necessarily need to be used, and a foam type heat insulating material such as foamed polyethylene can also be used.

  (5) Although the application example to the unit type building has been described in the above embodiment, the present invention can be applied to a building having another structure such as a building constructed by a steel frame assembling method.

  DESCRIPTION OF SYMBOLS 10 ... Building, 11 ... Foundation, 13 ... Underfloor space, 18 ... joist, 19 ... Floor surface material, 20 ... Building unit, 23 ... Floor beam as floor beam, 23d ... Groove, 37 ... Foundation heat insulating material, 38 ... Under floor Insulating material, 41 ... heat insulating material in the beam, 42 ... heat insulating material outside the beam.

Claims (6)

An outer peripheral foundation provided along the outer periphery of the building ;
And floor beams disposed along the outer peripheral foundation on top of the outer peripheral foundation,
A joist provided along the floor beam on the floor beam,
Applied to buildings with floor coverings provided on the joists,
A foundation heat insulating portion provided on an inner surface of the outer circumferential foundation;
An underfloor heat insulating part provided on the lower surface side of the floor material;
A floor beam heat insulating portion provided to cover the floor beam from the underfloor space side below the floor material;
The heat insulating structure for a building, wherein the floor beam heat insulating portion is provided continuously to the base heat insulating portion and the underfloor heat insulating portion. The floor beam is made of channel steel having a groove portion opened to the underfloor space side,
The floor beam heat insulating portion has a beam heat insulating portion disposed in the groove portion, and a beam outer heat insulating portion disposed outside the groove portion,
The heat insulating structure for a building according to claim 1, wherein the outside heat insulating portion is provided continuously to the basic heat insulating portion and the underfloor heat insulating portion.   The heat insulating structure for a building according to claim 2, wherein the heat insulating part in the beam and the heat insulating part outside the beam are separate bodies. The outer heat insulating portion of the beam has a length in the thickness direction of the outer peripheral foundation larger than that of the inner heat insulating portion of the beam, and is configured by a plurality of outer heat insulating materials divided in the thickness direction,
4. The heat insulating structure for a building according to claim 3, wherein each of the heat insulating materials outside the beam and the heat insulating material in the beam constituting the heat insulating portion in the beam are made of the same heat insulating material. The outer heat insulating portion of the beam is positioned such that an end of the underfloor space side in the thickness direction of the outer peripheral foundation is located at the same position as the surface of the underfloor space side of the basic heat insulating portion or closer to the underfloor space side. It is formed, The heat insulation structure of the building as described in any one of Claims 2 thru | or 4 characterized by the above-mentioned.   Between the floor beam and the floor material, an end portion of the underfloor heat insulating portion enters a gap on the underfloor space side than the joist, and the end portion is arranged in contact with the joist. The heat insulating structure for a building according to any one of claims 1 to 5, wherein the heat insulating structure is a building.

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