JP7206805B2 - Thermal insulation structure of building and its construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat insulating structure of a building and a method of installing a heat insulating material forming the heat insulating structure.

Conventionally, there is known a technique of laying a heat insulating material on the lower surface side of a floorboard of a building to improve the heat insulation performance of the floorboard. In addition, as a method of attaching heat insulating material to the lower surface of the floorboard, for example, a support member is attached to the horizontal member (specifically, a beam, a joist, or a joist) that supports the floorboard from the lower side, and There is known a method of supporting a laid heat insulating material with a supporting member.

By the way, it has been pointed out that in steel-framed buildings in which the horizontal members of the above configuration are formed of shaped steel or steel pipes, the horizontal members act as heat bridges, making the building susceptible to the effects of the outside air. there is For this reason, in such a building, there are cases in which heat insulating materials are arranged on the side surfaces of the horizontal members during underfloor repair work to suppress the thermal bridging phenomenon.

Patent Literature 1 listed below discloses a configuration in which a support member (fixture) fixed to the lower surface of a horizontal member (joist) is used to replenish the underfloor with a heat insulating material. The support member is fixed to the horizontal member by embedding a needle-shaped embedded portion in the lower surface of the horizontal member, and plate-like support portions extending in the horizontal direction are provided on both sides of the embedded portion. is provided. A plate-like heat insulating material is inserted into the gap between the supporting portion and the floorboard to cover the side surface of the horizontal member.

JP 2017-133313 A

However, in the prior art described above, it is necessary for a worker to enter the underfloor space and drive the embedded portion of the support member into the lower surface of the horizontal member using a tool such as a hammer. Therefore, in a building with a small underfloor space, it may be difficult to attach the support member, and there is room for improvement in terms of improving workability.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a heat insulating structure for a building and a method for installing heat insulating materials for forming the heat insulating structure, which can reduce the burden of construction work and improve the underfloor heat insulating performance. be.

The heat insulating structure for a building according to the first aspect includes a plurality of horizontal members arranged at predetermined intervals under the floor and supporting the floorboard from below; a plurality of upper support members that support the first heat insulating material laid between the horizontal members from below; and a plurality of lower support members that support the laid second heat insulating material from below.

In the heat insulating structure for a building according to the first aspect, a plurality of horizontal members that support the floorboard from below are arranged at predetermined intervals under the floor. A first heat insulating material is laid on the lower surface side of the floorboard between the horizontal members. Moreover, the second heat insulating material is arranged on the lower side of the first heat insulating material. In this way, by arranging the first heat insulating material and the second heat insulating material vertically, the heat insulating material is arranged on the side surface portion of the horizontal member. As a result, heat transfer to the inside and outside of the building through the floorboards and horizontal members is suppressed, so that the underfloor insulation performance is improved.

Here, the second heat insulating material arranged on the lower side of the first heat insulating material is supported from below by the lower support member, and the lower support member is engaged with the upper support member that supports the first heat insulating material. It is considered to be in a state of In other words, the second heat insulator is supported by the upper support member via the lower support member. Therefore, when assembling the second heat insulating material, it is not necessary to attach a new support member to the horizontal member using a tool. This makes it easier to install even in buildings with small underfloor spaces, reducing the burden on workers.

A heat insulating structure for a building according to a second aspect is the structure according to the first aspect, wherein the lower support member extends in the vertical direction, is arranged along the side surface of the horizontal member, and supports the upper support member. a plate-like engaging portion having a notch portion that can be engaged with a member; and a member extending from the lower end portion of the engaging portion to the outside of the side surface of the horizontal member, and the second heat insulating member is positioned downward. It has a plate-like support part that supports from.

In the building heat insulation structure according to the second aspect, the lower support member is configured to include the engaging portion arranged along the side surface of the horizontal member, and the notch portion provided in the engaging portion is It is configured to be engageable with the upper support member. Thus, an operator can engage the lower support member with the upper support member without the use of tools to place the insulation on the sides of the cross member. Therefore, the burden on workers in construction work is further reduced.

A heat insulating structure for a building according to a third aspect is the configuration according to the second aspect, wherein a pair of the lower support members are provided on both sides of the horizontal member, and one end of the lower support member is provided on one side surface of the horizontal member. By means of a string-like restraint member that is engaged with the support portion of the arranged lower support member and whose other end is engaged with the support portion of the lower support member arranged on the other side surface of the horizontal member A third heat insulating material covering the lower surface of the horizontal member is supported from below.

In the insulating structure of the building according to the third aspect, in addition to the first heat insulating material and the second heat insulating material, the third heat insulating material is provided to cover the lower surface of the horizontal member. Therefore, a heat-insulating structure covering the side and bottom surfaces of the horizontal members is ensured. As a result, heat transfer to the inside and outside of the building through the horizontal members is further suppressed, and the underfloor insulation performance is improved.

In addition, in this aspect, the third heat insulating material is supported from below by string-like restraining members whose both ends are respectively locked to both sides of the horizontal member. Therefore, the third heat insulating material can be easily attached by attaching the third heat insulating material to the lower surface of the horizontal member and passing the string-like restraint member around the lower surface of the horizontal member. Therefore, it can be easily constructed even in a building with a small underfloor space.

In a building insulation structure according to a fourth aspect, in the building insulation structure according to the third aspect, the lower support member has The angle formed by the engaging portion and the support portion is set to be an acute angle, and in a state where the third heat insulating material is assembled by the restraining member, the angle formed is substantially vertical due to the load transmitted from the restraining member. , the support portion is elastically deformed.

In the building insulation structure according to the fourth aspect, a load is transmitted from the restraining member that supports the third heat insulating material to the support portion of the lower support member. As a result, the supporting portion is elastically deformed such that the angle formed by the engaging portion and the supporting portion in a side view changes from an acute angle to a substantially vertical angle. For this reason, an upward tensile load is applied to both end portions of the restraining members arranged on both sides of the horizontal member from the supporting portions that are to be elastically restored. As a result, the supporting force of the restraining member for the third heat insulating material is increased, so that the durability of the underfloor heat insulating structure is improved.

According to a fifth aspect of the building heat insulation structure, in the configuration according to the third aspect or the fourth aspect, both ends of the restraint member are engaged with holes formed in the support portions of the lower support member. A possible hook is provided.

In the building insulation structure according to the fifth aspect, hooks are provided at both ends of the restraining member, and each hook is engaged with a hole provided in the support portion of the lower support member. Therefore, both ends of the restraint member can be locked to the lower support member with a simple structure.

A heat insulating material construction method according to a sixth aspect is a heat insulating material construction method applied to the insulating structure of a building according to any one of claims 1 to 5, wherein the floor board is supported. The first heat insulating material laid between the plurality of horizontal members and the upper supporting member supporting the first heat insulating material from below are installed under the floor of an existing building. and a second step of supporting said second insulation against said lower support member.

In the method of installing a heat insulating material according to the sixth aspect, first, a lower support member is engaged with an upper support member that is pre-arranged under the floor of an existing building. After that, by supporting the second heat insulating material on the lower support member, the first heat insulating material and the second heat insulating material can be laid vertically side by side between the horizontal members. Therefore, an existing building provided with the first heat insulating material for improving the heat insulating performance of the floorboard can be replenished with the second heat insulating material covering the side portion of the horizontal member without using a tool or the like. As a result, the insulation performance of the underfloor of an existing building can be improved by a simple method, and the burden on the workers involved in the underfloor repair work can be reduced.

A heat insulating material construction method according to a seventh aspect is a heat insulating material construction method applied to the insulating structure of a building according to any one of claims 3 to 5, wherein the floor board is supported. The first heat insulating material laid between the plurality of horizontal members and the upper supporting member supporting the first heat insulating material from below are installed under the floor of an existing building. a second step of supporting the third insulation against the restraining member; and a third step of supporting the second insulation against the lower support member.

In the method of installing the heat insulating material according to the seventh aspect, first, the lower support member is engaged with the upper support member previously provided under the floor of the existing building. After that, the lower surface of the horizontal member is covered with the third heat insulating material by supporting the third heat insulating material on the restraining member. After that, by supporting the second heat insulating material on the lower support member, the first heat insulating material and the second heat insulating material are arranged vertically between the horizontal members. As a result, it is possible to replenish the heat insulating material covering the side and bottom surfaces of the horizontal member by a simple method, and to reduce the burden on workers involved in underfloor repair work.

As described above, the heat insulation structure for a building according to the first aspect has the excellent effects of reducing the burden of construction work and improving the underfloor heat insulation performance.

According to the heat insulating structure of the building according to the second aspect, it is possible to arrange the heat insulating material on the side surface of the horizontal member without using a tool, and it is possible to further reduce the burden on the worker in the construction work. have the same effect.

According to the heat insulating structure for a building according to the third aspect, the underfloor heat insulating performance is improved, and excellent effects can be obtained in that even a building with a small underfloor space can be easily constructed.

The heat insulating structure for a building according to the fourth aspect has an excellent effect of improving the durability of the support structure for the third heat insulating material that covers the lower surface of the horizontal member.

According to the heat insulating structure for a building according to the fifth aspect, both ends of the restraining member can be locked to the lower support member with a simple configuration, and the excellent effect of facilitating the work of installing the third heat insulating material is achieved. have.

According to the insulation construction method according to the sixth aspect, it is possible to replenish the insulation covering the side surface of the horizontal member by a simple method, and it is possible to reduce the burden on the workers involved in underfloor repair work. have the same effect.

According to the method for installing the heat insulating material according to the seventh aspect, the heat insulating material that covers the side surfaces and the bottom surface of the horizontal member can be replenished by a simple method, and the burden on the worker involved in underfloor repair work can be reduced. It has the excellent effect of being able to

FIG. 8 is an enlarged cross-sectional view showing a partially enlarged state cut along line 1-1 in FIG. 7; FIG. 2 is a partially enlarged cross-sectional view showing a structure in the vicinity of a floor girder in a building to which the heat insulating structure according to the first embodiment is applied; FIG. 4 is a partially enlarged cross-sectional view showing a structure in the vicinity of a floor beam in a building to which the heat insulating structure according to the first embodiment is applied; FIG. 4 is an enlarged perspective view showing a second upper support member shown in FIG. 3; (A) is a side view of the lower support member shown in FIG. 1, and (B) is a front view of the lower support member shown in FIG. (A) is a side view corresponding to FIG. 5(A) showing a state in which the lower support member is locked to the second upper support member, and (B) is a line 6B-6B of FIG. 6(A); It is a cross-sectional view showing a state cut along. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of the building to which the heat insulation structure which concerns on 1st Embodiment was applied. (A) is a perspective view of a lower support member according to a second embodiment, and (B) is a side view thereof. It is an expanded sectional view corresponding to FIG. 1 which shows the heat insulation structure which concerns on 2nd Embodiment. (A) is a perspective view of a lower support member according to a third embodiment, and (B) is a side view thereof. It is an expanded sectional view corresponding to FIG. 1 which shows the heat insulation structure which concerns on 3rd Embodiment. (A) to (C) are side views showing modifications of the restraining member.

<First embodiment>
A heat insulation structure 12 for a building (hereinafter simply referred to as "heat insulation structure 12") according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 7. FIG. The heat insulation structure 12 is provided in the underfloor space 20 of the building 10 . Below, first, after demonstrating the whole structure of the building 10, the heat insulation structure 12 is demonstrated in detail.

(Overall configuration of building 10)
As shown in FIG. 7, the building 10 is a unit building. The building 10 is constructed by installing a plurality of lower floor building units 16 on a foundation 14 and then installing a plurality of upper floor building units 18 on the lower floor building units 16. there is The foundation 14 is provided continuously along the entire perimeter of the building 10, and the inner space surrounded by the foundation 14 serves as an underfloor space 20 (see FIGS. 1 to 3). 2, 3, and 7, illustration of the floor finishing material 32 is omitted for convenience of explanation.

Each building unit 16, 18 is joined to four pillars 22 and the upper end of each pillar 22, and joined to the lower end of each pillar 22 by a ceiling girder 24 having a substantially rectangular shape in a plan view. and a floor girder 26 having a substantially rectangular shape in plan view. Thereby, the building units 16 and 18 are made into a skeleton frame.

Between the pair of longitudinal floor girders 26 are bridged a plurality of small floor girders 28 arranged substantially parallel to the lateral floor girders 26 . A floor plate 30 made of particle board or the like is fixed to the floor girders 26 and the small floor girders 28 as a basement. A floor finishing material 32 is laid on the finished surface (upper surface 30A) of the floor board 30 (see FIG. 1). In addition, the floor girders 26 and the floor small girders 28 correspond to the "horizontal members" in the present invention.

As shown in FIG. 2, the floor girders 26 are made of channel steel so that the cross-sectional shape when cut along the height direction (substantially vertical direction) of the building 10 forms a U-shape. formed. Specifically, the floor girder 26 includes a web portion 26A arranged along the height direction, an upper flange portion 26B projecting substantially horizontally from the upper end of the web portion 26A, and a lower end of the web portion 26A. and a lower flange portion 26C formed to face the upper flange portion 26B extending substantially horizontally.

On the other hand, as shown in FIG. 3, the small floor beams 28 are steel square pipes. The small floor beam 28 includes a pair of side portions 28A arranged along the height direction, an upper surface portion 28B connecting the upper ends of the pair of side portions 28A in the horizontal direction, and the lower ends of the side portions 28A extending in the horizontal direction. and a connecting lower surface portion 28C.

(Configuration of heat insulating structure 12)
As shown in FIG. 1, on the side of the lower surface 30B of the floor plate 30, between adjacent floor girders 26 and floor small girders 28, and between adjacent floor small girders 28, first plate-shaped first A heat insulating material 34 is laid. The first heat insulating material 34 is made of polystyrene foam, for example. The first heat insulating material is supported from below by a plurality of first upper support members 36 attached to the floor girders 26 and a plurality of second upper support members 38 attached to the floor small beams 28 . The first upper support member 36 and the second upper support member 38 correspond to the "upper support member" in the present invention.

As shown in FIG. 2, the first upper support member 36 is formed by curving a long plate material whose thickness direction is the height direction. Also, as an example, it is made of steel plate. Specifically, the first upper support member 36 includes an upper portion 36A that abuts on the upper flange portion 26B of the floor girders 26, an intermediate portion 36B that vertically hangs down from the indoor-side end of the upper portion 36A, and an intermediate portion 36B. It has a lower portion 36C that extends indoors from the lower end. In other words, the first upper support member 36 is substantially S-shaped in side view, and the upper part 36A is placed on the upper flange portion 26B of the floor girder 26, so that the floor girder 26 is supported from below. Supported.

The lower portion 36C extends from the lower end portion of the intermediate portion 36B toward the indoor side while being slightly inclined downward (see FIG. 1). A claw portion 36D extending upward from the lower end portion is provided at the lower end portion of the lower portion 36C.

As shown in FIG. 1, the first heat insulating material 34 is inserted into the gap between the floor plate 30 and the lower part 36C of the first upper support member 36 at the end portion arranged along the floor girder 26 to form the claw portion 36D. supported from below by

As shown in FIG. 4, the second upper support member 38 is formed by curving a long plate material whose thickness direction is the height direction, like the first upper support member. Moreover, as an example, it is made of steel plate. The shape of the second upper support member 38 is equivalent to a shape in which the pair of first upper support members 36 are arranged to face each other in a side view, and has a substantially hat shape. Specifically, the second upper support member 38 includes an upper portion 39 that abuts on the upper surface portion 28B of the small floor beam 28, an intermediate portion 36B that vertically hangs from both left and right ends of the upper portion 39 in a side view, and an intermediate portion 36B. and a lower portion 36C extending outward from the side portion 28A from the lower end. A claw portion 36D is provided at the tip of the lower portion 36C. Note that the intermediate portion 36B, the lower portion 36C, and the claw portion 36D have the same configuration as the first upper support member 36, and thus description thereof is omitted.

The dimension between the intermediate portions 36B provided at the left and right ends of the upper portion 39 is substantially the same as the dimension in the plate thickness direction of the side portion 28A of the small floor beam 28 . When the upper part 39 is placed on the upper surface part 28B of the small floor beam 28, the small floor beam 28 is inserted between the pair of intermediate parts 36B. Thereby, the second upper support member 38 is supported by the small floor beam 28 from below.

As shown in FIGS. 1 and 3, the first heat insulating material 34 is inserted into the gap between the floor board 30 and the lower part 36C of the second upper support member 38 at the end portion arranged along the floor beam 28. , and claw portions 36D from below.

Further, on the lower surface side of the first heat insulating material 34, between the adjacent floor girders 26 and floor small girders 28, and between the adjacent floor small girders 28, plate-shaped second heat insulating materials 40 are provided. are laid. The second heat insulating material 40 is made of glass wool, for example. The second heat insulating material is supported from below by a block body 42 supported by the lower flange portion 26C of the floor girder 26 and a lower support member 44 engaged with the second upper support member 38 .

As shown in FIGS. 1 and 2, the block body 42 is formed in a long prismatic shape and extends along the extending direction of the floor girder 26 . Moreover, as an example, it is made of polystyrene foam, glass wool, or the like. The block body 42 is placed on the upper surface of the lower flange portion of the floor girders 26 and fixed by means such as double-sided tape or adhesive. The height position of the upper surface of the block body 42 substantially coincides with the height position of the lower end of the engaging portion 46 of the lower support member 44, which will be described later.

The second heat insulating material 40 is supported by the block body 42 from below by inserting the end portion arranged along the floor girder 26 into the gap between the first heat insulating material 34 and the block body 42 .

On the other hand, the lower support member 44 is formed by curving a long plate material whose thickness direction is the height direction. Moreover, as an example, it is made of steel plate. Specifically, the lower support member 44 includes an engaging portion 46 extending in the height direction along the side surface portion 28A of the small floor beam 28, and an engaging portion 46 extending from the lower end of the small floor beam 28 to the small floor beam 28. A support portion 48 extending outward from the side portion 28A is provided. In other words, the lower support member 44 is formed in a substantially L shape when viewed from the side.

As shown in FIGS. 5A and 5B, the engaging portion 46 is formed in a rectangular shape when viewed from the front, and the plate thickness direction is the thickness direction of the side portion 28A of the small floor beam 28. Match. A slit-shaped notch 50 extending from the upper end of the engaging portion 46 to substantially the center of the engaging portion 46 is provided at one widthwise end of the engaging portion 46 . The extending direction of the notch 50 substantially coincides with the horizontal direction, and a stepped portion 52 projecting toward the lower surface 50B is formed in the intermediate portion of the upper surface 50A of the notch 50 . That is, the dimension between the upper surface 50A and the lower surface 50B of the notch portion 50 is formed so that the portion located on the one end side of the engaging portion 46 with the stepped portion 52 as a boundary is smaller. The open end (outer end) of the notch 50 formed at one end of the engaging portion 46 is chamfered.

On the other hand, the support portion 48 is formed in a substantially rectangular shape in plan view. Before the lower support member 44 is assembled, the support portion 48 extends from the lower end portion of the engagement portion 46 toward the outside of the side surface portion 28A of the small floor beam 28 while being inclined slightly upward. there is Therefore, the angle θ1 formed by the engaging portion 46 of the lower support member 44 and the support portion 48 in side view is an acute angle in side view. It should be noted that θ1=85° in this embodiment. In addition, a hole 54 is formed through the support portion 48 in the plate thickness direction, and one end of a restraining member 58, which will be described later, is locked.

As shown in FIGS. 6A and 6B, the lower support member 44 is locked to the second upper support member 38 by inserting the second upper support member into the notch 50. It is configured.

Specifically, the engagement portion 46 of the lower support member 44 is inserted so that the portion above the notch 50 is arranged outside the middle portion 36B of the second upper support member 38. . In other words, the intermediate portion 36B of the second upper support member 38 is arranged between the side portion 28A of the small floor beam 28 and the engaging portion 46. As shown in FIG. Further, the lower portion 36C of the second upper support member 38 extends outward beyond the side portion 28A of the small floor beam 28 through the notch portion 50. As shown in FIG. In this state, the upper surface 50A of the notch 50 contacts the lower portion 36C of the second upper support member 38, thereby restricting the downward movement of the lower support member 44. As shown in FIG.

Also, when the second upper support member 38 is inserted all the way into the notch 50 , the second upper support member 38 is accommodated between the inner end of the notch 50 and the stepped portion 52 . Further, in this state, the lower portion 36C of the second upper support member 38 extending obliquely downward through the cutout portion 50 and the stepped portion 52 of the cutout portion 50 overlap each other in a side view. (See FIG. 6B). Therefore, when the lower support member 44 is moved along the extension direction of the floor beam 28, the lower portion 36C of the second upper support member 38 hits the inner end portion of the notch portion 50 or the stepped portion 52 to prevent the movement. Regulated. This prevents the lower support member 44 from falling off from the second upper support member 38 after the lower support member 44 is attached.

As shown in FIG. 1, the secondary insulation 40 has an end portion disposed along the floor joist 28 of the secondary insulation 40 between the first insulation 34 and the support portion 48 of the lower support member 44 . part is inserted. Thereby, the second heat insulating material 40 is supported from below by the supporting portion 48 .

Furthermore, as shown in FIG. 3 , a third heat insulating material 56 is arranged below the lower support member 44 to cover the lower surface portion 28C of the small floor beam 28 . The third heat insulating material 56 is made of glass wool, for example. The third heat insulating material 56 has a U-shape in side view, and is arranged so as to wrap the lower side portion 28A of the floor beam 28 and the lower surface portion 28C of the floor beam 28 . The third heat insulating material is supported from below by a string-like restraint member 58 that is engaged with the lower support member 44 .

The binding member 58 includes a string member 60 and hooks 62 attached to both ends of the string member 60 . Each hook 62 is engaged with a hole 54 formed in a pair of lower support members 44 arranged on the left and right side portions 28A of the floor beam 28 (see FIG. 1).

A third heat insulating material 56 is arranged between a restraining member 58 bridged between the small floor beam 28 and the pair of lower support members 44 . Thereby, the third heat insulating material is supported by the restraining member 58 from below.

The overall length of the restraining member 58 is set to be shorter than the outer circumference of the third heat insulating material 56. When the third heat insulating material 56 is wrapped with the restraining member 58 and attached to the small floor beam 28, the restraining member 58 A tension is generated in the string member 60 of . A downward load acts on the support portions 48 of the lower support member 44 via the hooks 62 provided at both ends of the restraint member 58 . In this state, the supporting portion 48 is elastically deformed by the load transmitted from the hook 62, and the angle θ1 formed by the engaging portion 46 of the lower supporting member 44 and the supporting portion 48 in a side view is substantially vertical (FIG. 1). reference). Also, due to the restoring force of the lower support member 44 , an upward load acts on both ends of the restraining member 58 , so that the third heat insulating material 56 is lifted upward by the restraining member 58 to reach the floor beam 28 . It is configured to improve the assembly strength.

(Action and effect)
Next, a construction method for applying the heat insulating structure 12 to the building 10 will be described, and the action and effect of this embodiment will be described.

In this embodiment, the first heat insulating material 34 and the first heat insulating material 34 laid in advance between the adjacent floor girders 26 and floor small girders 28 and between the adjacent floor small girders 28 are supported from below. A case of construction under the floor of the building 10 having the first upper supporting member 36 and the second upper supporting member 38 will be described as an example. In such a case, the worker crawls into the underfloor space 20 of the building 10 and performs the work of assembling the second heat insulating material 40 and the third heat insulating material 56 .

(1) First, the operator engages the lower support member 44 with the second upper support member 38 . Specifically, the second upper support member 38 is inserted into the notch 50 of the lower support member 44 so that the lower support member 44 is suspended below the second upper support member 38 .

(2) Next, the third heat insulating material 56 is supported by the restraining member 58 . In this step, first, the third heat insulating material 56 is attached to the lower part of the floor beam 28 . Then, the hooks 62 of the restraining member 58 are engaged with the lower support members 44 arranged on both side surfaces 28A of the small floor beam 28 by passing the restraining member 58 from the lower surface portion 28C side of the small floor beam 28.

(3) Finally, the second heat insulating material 40 is supported by the lower support member 44 . In this step, the ends of the second heat insulating material 40 are attached to the side surfaces of the floor beams 28 to which the lower support members 44 have already been attached. Specifically, between the floor girders 26 and the floor small girders 28, a block body in which one end of the second heat insulating material 40 arranged along the floor girders 26 is fixed in advance to the lower flange portion 26C of the floor girders 26 is provided. 42 (see FIG. 2). On the other hand, one end of the second heat insulating material 40 arranged along the floor beam 28 is inserted between the first heat insulating material 34 and the support portion 48 of the lower support member 44 .

On the other hand, between the adjacent floor beams 28, both ends of the second heat insulating material 40 arranged along the floor small beams 28 are placed between the first heat insulating material 34 and the support portions 48 of the lower support members 44. insert. As a result, the first heat insulating material 34 and the second heat insulating material 40 are laid vertically side by side between the adjacent floor girders 26 and floor small girders 28 and between the adjacent floor small girders 28 .

Through the above steps, the construction work of the heat insulating material is completed.

In the heat insulating structure 12 of the present embodiment described above, the first heat insulating material 34 and the second heat insulating material 40 are laid vertically side by side on the lower surface 30B side of the floor plate 30 . Also, the first heat insulating material 34 and the second heat insulating material 40 are arranged so as to cover the side surface portion 28A of the floor beam 28. As shown in FIG. Furthermore, a third heat insulating material 56 is arranged on the lower side of the floor beam 28 so as to cover the lower surface portion 28C of the floor beam 28 . As a result, heat transfer to the inside and outside of the building through the floorboards 30 and the floor beams 28 is suppressed, so that the underfloor insulation performance of the building 10 can be improved.

In addition, the lower support member 44 that supports the second heat insulating material 40 from below is inserted into the notch 50 provided in the engagement portion 46 so that the second upper support member 38 is inserted into the notch 50 . can be locked. Therefore, when assembling the second heat insulating material 40, it is not necessary to attach a new support member to the floor beam 28 using a tool. This makes it easier to install even in buildings with small underfloor spaces, reducing the burden on workers.

In addition, the operation of attaching the third heat insulating material 56 according to the present embodiment involves attaching the third heat insulating material 56 to the lower surface portion 28C of the floor beam 28, and attaching a string-like restraint member to the lower surface portion 28C of the floor small beam 28. 58 is passed around. Specifically, hooks 62 are provided at both ends of the restraint member 58, and each hook 62 is hooked to the hole 54 of the support portion 48 of the lower support member 44 provided on both sides of the small floor beam 28 to engage. . In this way, the third heat insulating material 56 can be attached by a simple method, and construction can be easily performed even in a building with a small underfloor space.

In addition, in this embodiment, the load from the restraining member 58 that supports the third heat insulating material 56 is transmitted to the supporting portion 48 of the lower supporting member 44 . As a result, the supporting portion 48 is elastically deformed such that the angle θ1 formed by the engaging portion 46 and the supporting portion 48 in a side view changes from an acute angle (eg, θ=85°) to a substantially vertical angle. For this reason, an upward tensile load acts on both ends of the restraining members 58 arranged on both sides of the small floor beam 28 from the supporting portions 48 which are trying to elastically return via the hooks 62 . As a result, the restraining member 58 can strongly support the third heat insulating material 56 from below, and the durability of the underfloor heat insulating structure of the building 10 can be improved.

In addition, the method of installing the heat insulating material described above is a simple method for underfloor repair work of the building 10 in which the first heat insulating material 34 for improving the heat insulating performance of the floor plate 30 is laid in advance. 28A and lower surface 28C can be covered with a heat insulating material. As a result, the underfloor insulation performance of the building 10 can be further improved, and the burden on workers involved in the underfloor repair work can be reduced.

<Second embodiment>
A heat insulation structure 70 for a building according to the second embodiment (hereinafter simply referred to as “heat insulation structure 70”) will be described below with reference to FIGS. 8 and 9. FIG. The heat insulating structure 70 of this embodiment is characterized in that it includes lower support members 72 that support the second heat insulating materials 40 arranged on both left and right sides of the floor beam 28 from below. It should be noted that the same reference numerals are assigned to the same configurations and actions as in the first embodiment, and the description thereof will be omitted.

FIG. 8A shows a perspective view of the lower support member 72 according to this embodiment. As shown in this figure, the lower support member 72 includes a bottom surface portion 74 arranged on the side of the lower surface portion 28C of the small floor beam 28, and a pair of engaging portions 76 erected vertically upward from the bottom surface portion 74. , and support portions 78 extending from the bottom portion 74 to the left and right outside of the side portions 28A of the small floor beams 28. As shown in FIG. Moreover, as an example, the lower support member 72 is formed of a steel plate.

The bottom surface portion 74 is a substantially rectangular plate in a plan view, with the vertical direction being the plate thickness direction. The longitudinal direction of the bottom surface portion 74 coincides with the extending direction of the small floor beam 28, and the widthwise dimension of the bottom surface portion 74 substantially coincides with the thickness direction dimension of the side surface portion 28A of the small floor beam 28. .

A pair of engaging portions 76 standing vertically upward are integrally formed at both ends in the short side direction of the bottom portion 74 on one side in the longitudinal direction from the central portion. The engaging portion 76 is formed in a rectangular shape whose longitudinal direction is the vertical direction when viewed from the front. formed. A slit-shaped notch portion 50 is formed in the engaging portion 76 . In addition, since the structure of the notch part 50 is the structure similar to 1st Embodiment mentioned above, description is omitted.

On the other hand, a pair of support portions 78 are integrally formed on the other side of the bottom portion 74 in the longitudinal direction from the central portion thereof, the support portions 78 extending from both ends in the short direction to the left and right outer sides. Each support portion 78 has a substantially vertical direction as a plate thickness direction and is formed in a rectangular shape in a plan view. Further, the support portion 78 extends from the end portion of the bottom portion 74 so as to be inclined slightly upward toward the outside. Therefore, before the lower support member 72 is assembled, the angle θ2 formed by the engaging portion 76 and the support portion 78 of the lower support member 72 is an acute angle in side view. Further, each support portion 78 is formed with a hole 54 for engaging the hook 62 of the restraint member 58 .

As shown in FIG. 9 , the lower support member 72 has the floor beam 28 inserted between the pair of engaging portions 76 and the second upper support member 38 inserted into the notch 50 . As a result, the lower support member 72 is engaged with the second upper support member 38 . In addition, in the state where the second heat insulating material 40 is assembled, the second heat insulating material 40 arranged on both sides of the small floor beam 28 is supported from below by the pair of support portions 78 .

(Action and effect)
The basic configuration of the heat insulating structure 70 of this embodiment follows the heat insulating structure 12 of the first embodiment. Therefore, it is possible to obtain the same function and effect as the heat insulating structure 12 of the first embodiment.

In addition, in this embodiment, the lower support members 72 can support the second heat insulating materials 40 arranged on both sides of the side portions 28A of the floor beams 28 . Therefore, compared to a structure in which separate lower support members are arranged on both sides of the floor beam 28, the number of members can be reduced, and the number of man-hours during construction can be reduced.

<Third Embodiment>
A heat insulation structure 80 for a building according to the third embodiment (hereinafter simply referred to as “heat insulation structure 80”) will be described below with reference to FIGS. 10 and 11. FIG. The heat insulation structure 80 of this embodiment is characterized in that it includes lower support members 82 that support the second heat insulation members 40 arranged on both left and right sides of the floor beam 28 from below, as in the second embodiment. The same reference numerals are given to the same configurations and actions as those of the first embodiment and the second embodiment, and the description thereof will be omitted.

FIG. 10A shows a perspective view of the lower support member 82 according to this embodiment. As shown in this figure, the lower support member 82 includes a bottom portion 74 arranged on the side of the lower surface portion 28C of the small floor beam 28, and a pair of engaging portions 76 erected vertically upward from the bottom portion 74. , is equipped with The lower support member 82 includes a pair of extensions 84 extending along the longitudinal direction of the bottom surface 74 from the upper part of the engaging part 76 and the side surface 28A of the small floor beam 28 extending from the lower end of the extensions 84 . and a support portion 86 extending to the left and right outside. Also, as an example, the lower support member 82 is made of a steel plate. Note that the bottom surface portion 74 and the engaging portion 76 have the same configurations as those of the second embodiment, so the description thereof is omitted.

The pair of extension portions 84 are provided on the upper portion of one side of the pair of engaging portions 76 opposite to the side on which the notch portion 50 is formed. The extending portion 84 is aligned in the plate thickness direction with the engaging portion 76 and has a rectangular shape when viewed from the front. Support portions 86 extending in a direction away from the extension portions 84 are formed integrally with the lower end portions of the pair of extension portions 84 .

Each support portion 86 has a substantially vertical direction as a plate thickness direction and is formed in a rectangular shape in a plan view. Further, the support portion 86 extends from the lower end portion of the extension portion 84 so as to be inclined slightly upward toward the outside. Therefore, before the lower support member 82 is assembled, the angle θ3 between the engaging portion 76 and the support portion 86 of the lower support member 82 is an acute angle in side view. Further, each support portion 86 is formed with a hole 54 for engaging the hook 62 of the restraining member 58 .

As shown in FIG. 11 , the lower support member 82 has the floor beam 28 inserted between the pair of engaging portions 76 and the second upper support member 38 inserted into the notch 50 . As a result, the lower support member 82 is locked to the second upper support member 38 . Further, in the state where the second heat insulating material 40 is assembled, the second heat insulating material 40 arranged on both sides of the small floor beam 28 is supported from below by the pair of support portions 86 .

(Action and effect)
The basic configuration of the heat insulating structure 80 of this embodiment follows the heat insulating structure 12 of the first embodiment. Therefore, it is possible to obtain the same function and effect as the heat insulating structure 12 of the first embodiment.

In addition, in this embodiment, the lower support members 82 can support the second heat insulating materials 40 arranged on both sides of the side portions 28A of the floor beams 28 . Therefore, compared to a structure in which separate lower support members are arranged on both sides of the floor beam 28, the number of members can be reduced, and the number of man-hours during construction can be reduced.

Moreover, by appropriately setting the vertical dimension of the extension portion 84, it is possible to support various thicknesses of heat insulating material, and the structure is highly versatile.

[supplementary explanation]
In the first to third embodiments, the heat insulating structures 12, 70, 80 are applied to the building 10, which is a unit building, but the present invention is not limited to this. It may be applied under the floor of a building with a steel frame structure or a wooden building constructed by a conventional construction method. Therefore, the floor girders 26 and the floor small girders 28 are not limited to being made of steel, but may be made of wood.

In addition, in the first to third embodiments, the floor girders 26 and the floor small girders 28 are used as the "horizontal members" that support the floorboards from below, but the present invention is not limited to this. or joists.

Further, in the first to third embodiments, the third heat insulating material 56 is provided on the lower side of the floor beam 28, but the present invention is not limited to this, and the third heat insulating material 56 is not assembled. may be configured.

In addition, in the first to third embodiments, the support portion 48 of the lower support member 44 is inclined slightly upward toward the outside of the small floor beam 28 (for example, θ1 = θ2 = θ3 = 85°), but the present invention is not limited to this. The support portion 48 may be configured to extend along the horizontal direction (θ1=θ2=θ3=90°), and the support portion 48 may be inclined slightly downward toward the outside of the small floor beam 28. (When θ1, θ2, and θ3 are set to obtuse angles).

Further, in the first embodiment, the hooks 62 are provided at both ends of the restraining member 58, but the present invention is not limited to this. As with a restraining member 90 shown in FIG. 12A, a configuration in which clips 92 are provided at both ends, and a configuration in which the outer ends of the support portion 48 are held by the clips 92 may be employed. Alternatively, as in a restraining member 100 shown in FIG. 12B, annular portions 102 are provided at both ends of the restraining member 100, and the annular portions 102 are hooked to the lower notch portions 50 formed in the support portion 48 to be locked. It is good also as a structure which carries out. Alternatively, as in the restraint member 200 shown in FIG. It is good also as a structure hooked and latched. Also, the configurations of the restraining members 90, 100, and 200 described above can also be applied to the second embodiment or the third embodiment.

In addition, in the above-described first embodiment, the supporting members provided on the floor beams 28 are the second upper supporting members 38, but this is not limiting, and the first upper supporting members 36 are provided on the floor small beams 28. It is good also as a structure which carries out. That is, the first upper support member 36 may be provided on each of the left and right sides of the small floor beam 28 to support the second heat insulating materials 40 arranged on both sides of the small floor beam 28 .

Further, in the above-described first embodiment, the heat insulating structure 12 is applied to the building 10 in which the first heat insulating material 34 is assembled in advance to the lower side of the floorboard 30 using the first upper supporting member 36 and the second upper supporting member 38. I explained the construction method. However, the present invention is not limited to this, and the heat insulation structure 12 may be applied to a newly constructed building. In this case, first, the first upper support member 36 and the second upper support member 38 are installed on the floor girders 26 and the floor small girders 28 . At this time, the first upper support member 36 may be temporarily fixed to the upper flange portion 26B of the floor girder 26 using double-sided tape or the like. Thereafter, the lower support member 44 is engaged with the second upper support member 38 and the restraining member 58 is made to support the third heat insulating material 56 . Next, the lower support member 44 is made to support the second heat insulating material 40 , and then the first upper support member 36 and the second upper support member 38 are made to support the first heat insulating material 34 . After that, the construction work is completed by fixing the floor plate 30 to the floor girders 26 and the floor small girders 28 .

REFERENCE SIGNS LIST 10 building 12 heat insulating structure of building 30 floor board lower surface of 30B floor board 26 floor girder (horizontal member)
28 Floor beams (horizontal members)
34 First heat insulator 40 Second heat insulator 56 Third heat insulator 36 First upper support member (upper support member)
38 second upper support member (upper support member)
44 Lower support member 46 Engagement part 48 Support part 54 Hole 50 Notch 58 Restraint member 62 Hook 70 Thermal insulation structure of building 72 Lower support member 76 Engagement part 78 Support part 80 Thermal insulation structure of building 82 Lower support member 86 Support part 90 Restraint member 100 Restraint member 200 Restraint member θ1 Angle between engagement portion and support portion θ2 Angle between engagement portion and support portion θ3 Angle between engagement portion and support portion

Claims (6)

a plurality of horizontal members arranged at predetermined intervals under the floor and supporting the floorboard from below;
a plurality of upper support members attached to the horizontal members and supporting from below a first heat insulating material laid between the lower surface side of the floor plate and between the horizontal members;
a plurality of lower support members that are engaged with the upper support member and support from below the second heat insulator laid between the horizontal members and on the lower side of the first heat insulator ;
The upper support member has a contact portion that contacts the upper surface of the horizontal member, an intermediate portion that hangs down from the contact portion, and a lower portion that extends from the intermediate portion and supports the first heat insulating material from below. has
The lower support member includes a plate-like engaging portion extending in the vertical direction, arranged along the side surface of the horizontal member, and having a cutout portion that can be engaged with the lower portion of the upper support member. a plate-shaped support portion extending from the lower end of the engaging portion to the outside of the side surface of the horizontal member and supporting the second heat insulating member from below ;
Thermal insulation structure of the building. A pair of the lower support members are provided on both sides of the horizontal member,
One end is engaged with the support portion of the lower support member arranged on one side surface of the horizontal member, and the other end is the support portion of the lower support member arranged on the other side surface of the horizontal member. A third heat insulating material that covers the lower surface of the horizontal member is supported from below by a string-like restraint member that is locked to the
The thermal insulation structure of the building according to claim 1 . In the lower support member, before the third heat insulating material is assembled using the restraining member, the angle formed by the engaging portion and the supporting portion is set to be an acute angle in a side view, and the restraining member allows the third heat insulating material to form an acute angle. 3 When the heat insulating material is assembled, the support portion is elastically deformed by the load transmitted from the restraining member so that the angle formed is substantially vertical.
The heat insulation structure of the building according to claim 2 . Both ends of the restraint member are provided with hooks that can be engaged with holes formed in the support portion of the lower support member,
The heat insulation structure of the building according to claim 2 or 3 . A method for installing a heat insulating material applied to the heat insulating structure of a building according to any one of claims 1 to 4 ,
The lower support member is installed under the floor of an existing building provided with the first heat insulator laid between the plurality of horizontal members that support the floor plate and the upper support member that supports the first heat insulator from below. a first step of engaging the upper support member;
a second step of supporting the second heat insulating material on the lower support member;
Insulation installation method including. A method for installing a heat insulating material applied to the heat insulating structure of a building according to any one of claims 2 to 4 ,
The lower support member is installed under the floor of an existing building having the first heat insulator laid between the plurality of horizontal members that support the floor plate and the upper support member that supports the first heat insulator from below. a first step of engaging the upper support member;
a second step of supporting the third heat insulating material on the restraining member;
a third step of supporting the second heat insulating material on the lower support member;
Insulation installation method including.

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