JP2020033809A - Heat insulation method of underfloor space and heat insulation structure of underfloor space - Google Patents

Abstract

To provide a heat insulation method of an underfloor space and a heat insulation structure of an underfloor space capable of constructing a floor heat insulation reform in an existing building for reducing a heat loss from a floor and improving a heat insulation performance easily.SOLUTION: The invention is a heat insulation method of an underfloor space having an underfloor ventilation port at a rise part of a foundation of a building. The heat insulation method of the underfloor space comprises: an insertion process for inserting a bag body expanding in a column shape when filled with liquid in a state of pre-expansion through the underfloor ventilation port to inside of the underfloor space; an arrangement process for arranging the bag body to be along an outer periphery of the underfloor space; and a filling process for filling the inside of the bag body with a heat insulation material having fluidity from the underfloor ventilation port to form the heat insulation member in a column shape.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an underfloor space heat insulating method for insulating a building under a floor, and a heat insulating structure of the underfloor space.

  2. Description of the Related Art In recent years, underfloor heat insulation structures for improving heat insulation properties under floors of buildings have been known for the purpose of improving the living environment of buildings and improving energy efficiency (for example, Patent Document 1). In this underfloor heat insulation structure, a plate-like heat insulation material is arranged between the lower surface of the floor material and the ground (concrete surface) to realize heat insulation under the floor.

JP 2001-011997 A

  In order to improve the heat insulation performance of an existing building in which floor insulation is not installed, floor insulation reform in which an insulation material is installed under the floor is performed. The technology described in Patent Literature 1 is supposed to perform construction of an underfloor insulation structure on a newly-built building, and if it is to be applied to a floor insulation reform of an existing building, a large scale such as peeling of a floor material is required. Construction is required, the construction period is lengthened, and construction costs may increase.

  Therefore, the present invention has been made in consideration of the above-described circumstances, and a floor insulation reform for reducing heat loss from the floor and improving heat insulation performance can be easily installed in an existing building. It is an object of the present invention to provide a method and a heat insulating member for an underfloor space.

  In order to solve the above problems, the present invention has adopted the following aspects.

  An underfloor space heat insulation method according to one embodiment of the present invention is an underfloor space heat insulation method having an underfloor ventilation opening at a rising portion of a foundation of a building, in which a bag that expands in a columnar shape when a fluid is filled is inflated. An insertion step of inserting the underfloor ventilation hole into the interior of the underfloor space in the previous state, an arranging step of arranging the bag body along the outer periphery of the underfloor space, and A filling step of forming a pillar-shaped heat-insulating member by filling the material with a heat-insulating material having fluidity.

  According to this aspect, after the worker located outside the building inserts the uninflated bag from the underfloor ventilation port, the inside of the bag is filled with the heat insulating material in the underfloor space to inflate the bag. By forming the heat insulating member by this, the floor heat insulating reform can be performed without affecting the living room of the building. Moreover, since the heat insulating member is installed on the outer peripheral portion of the underfloor space that is easily affected by the outside air, the amount of the heat insulating material can be reduced, and the construction cost can be reduced.

  In the heat insulation method for an underfloor space according to one aspect of the present invention, in the inserting step, after attaching a guide rod to the bag body before inflation, the bag body is inserted together with the guide rod from the underfloor ventilation opening. It is configured.

  According to this aspect, by attaching the guide bar to the bag, it is possible to easily insert the bag together with the guide bar from the underfloor ventilation opening into the underfloor space.

  The heat insulation method for an underfloor space according to one aspect of the present invention is configured such that, in the arranging step, the guide rod is moved while moving along the inside of the rising portion, and the bags are juxtaposed inside the rising portion. Have been.

  According to this aspect, the guide rod to which the bag is attached can be moved from outside the underfloor ventilation opening, and the bag can be juxtaposed at a predetermined design position such as inside the rising portion.

  In the method of insulating a space under the floor according to one aspect of the present invention, in the filling step, a mixed gas in which a gas such as air and a heat insulating material are mixed is caused to flow into the inside of the bag, and the bag is inflated. The heat insulating material is filled in the bag.

  According to this aspect, by flowing the mixed gas in which the gas and the heat insulating material are mixed into the inside of the bag, the blowing of the gas causes the bag to expand, and the heat insulating material mixed with the gas forms the bag. By flowing into and accumulating inside, the heat insulating material can be easily filled and pressed into the inside of the bag. Moreover, according to this aspect, since the heat insulating material is filled in the inside of the bag, the collection method can be facilitated when the heat insulating member is replaced.

  In the method for insulating a space under the floor according to one aspect of the present invention, in the filling step, a hose connected to a blower is inserted into the inside of the bag, and a tip of the hose is an end region inside the bag. After arranging the blower, the blowing device is operated, and the mixed gas of the heat insulating material and the gas is blown into the inside of the bag body from the hose to move the hose in a drawing direction while filling the heat insulating material. Is configured.

  According to this aspect, the heat insulating material can be efficiently filled from the end inside the bag.

  The method for heat insulation of an underfloor space according to one aspect of the present invention further includes, before the inserting step, a laying step of laying a moisture-proof sheet body that develops in a mat shape by filling gas on the ground surface of the underfloor space. The laying step, after inserting the wound sheet body before inflation from the underfloor ventilation port, and filling the inside of the sheet body with gas to expand the sheet body, It is configured to be deployed while being rolled on the ground surface.

  According to this aspect, when the ground surface is exposed in the underfloor space, the moisture-proof sheet laid on the ground surface can be inserted from the underfloor ventilation opening. Further, since the sheet body before inflation is wound, the bag body can be inserted into the underfloor space from the underfloor ventilation opening. Then, when the inside of the bag is filled with gas, the bag is expanded in a mat shape, so that the sheet can be laid on the ground surface. Further, by expanding the wound sheet body while inflating the sheet body with the gas, even if there are irregularities and undulations on the ground surface, the sheet body can run over the ground and travel on its own.

  The heat insulation method of the underfloor space according to one aspect of the present invention, after the filling step, while installing a ventilator for discharging the air of the underfloor space in the underfloor ventilation port, provided on the foundation that communicates with the outside It is configured to further include an installation step of closing another underfloor ventilation port that has been set with a lid.

  According to this aspect, the ventilator exhausts the air in the underfloor space by shutting off the outside air and the underfloor space by the lid, thereby preventing the underfloor space from being kept in a high-humidity environment for a long time due to excess moisture. be able to.

  In the method for insulating a space under a floor according to one aspect of the present invention, after the installation step, the ventilation device is operated to exhaust air inside the space under the floor to the outside and introduce air inside the room under the floor. It is configured to further include a step.

  According to this aspect, by operating the ventilation device, the air-conditioned air in the living room can be introduced into the underfloor space, and the temperature of the air under the floor can be brought close to the temperature of the air in the living room, so that the floor surface is comfortable. Temperature can be kept.

  A heat insulation structure for an underfloor space according to one embodiment of the present invention includes a tubular bag and a heat insulator filled inside the bag, wherein the bag is filled with the heat insulator. A heat insulating member that expands in a columnar shape and is juxtaposed in the underfloor space at the rising portion of the foundation along the outer periphery of the underfloor space.

  According to this aspect, it is possible to install a heat insulating member for reducing heat loss in the underfloor space from the outside of the building via the underfloor ventilation port without affecting the living room.

  The underfloor space heat insulating structure according to one aspect of the present invention further includes a moisture-proof sheet body laid on the ground surface of the underfloor space such that the heat insulating member is placed thereon, wherein the sheet body is gaseous. Is configured to be developed in a mat shape by filling with.

  According to this aspect, when the ground surface of the underfloor space is exposed, the moisture-proof sheet body is laid on the ground surface from outside the building via the underfloor ventilation hole without affecting the living room. Can be.

  According to one aspect of the present invention, a floor heat insulation reform for improving heat insulation performance by reducing heat loss from the floor in an existing building by applying the heat insulation method of the underfloor space and the heat insulation structure of the underfloor space is simplified. Can be constructed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows an example of a structure of the foundation of the target building to which the heat insulation method of the underfloor space which concerns on embodiment of this invention is applied. It is sectional drawing which shows an example of a structure of the cloth foundation to which the heat insulation method of an underfloor space is applied. It is a top view which shows an example of a structure of the sheet body laid in the ground surface of an underfloor space. It is a figure which shows the process of a sheet laying process. It is a top view which shows an example of a structure of the bag body arrange | positioned inside the rising part of a cloth foundation. It is a perspective view which shows an example of the state which arranged the bag in the underfloor space. It is a figure which shows the state in which the heat insulating material was filled in the inside of the bag body, and the heat insulating member was formed.

  Hereinafter, embodiments of a heat insulation method for an underfloor space and a heat insulation structure for an underfloor space according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, some of the foundations 1 of an existing building have no floor insulation. The method of insulating the underfloor space, for example, is applied to the cloth foundation 2 to perform the floor insulation reform. The heat insulating member described below is installed in the underfloor space S inside the cloth foundation 2, for example.

  The cloth foundation 2 is a concrete foundation in which a rising portion 2a standing upward from the ground surface E is formed in a continuous wall shape. The cloth base 2 is formed in an inverted T-shaped cross section. The cloth foundation 2 includes a rising portion 2a that stands upright in the vertical direction, and a footing portion 2b that is formed in a direction perpendicular to the rising portion 2a when viewed from the cross-sectional direction and extends along the bottom of the rising portion 2a. The footing 2b is buried in the ground lower than the ground surface E.

  The rising portion 2a is provided, for example, according to the shape of the floor of the building. The rising portion 2a is, for example, arranged in a rectangular shape so as to support the periphery of a rectangular plate-like floor slab 10 as viewed in a plane direction. The rising portion 2a is formed, for example, so that the height from the ground surface E is about 400 [mm]. A plurality of floor slabs 10 are arranged according to the floor area and layout of the building. The floor slab 10 is, for example, an ALC (Autoclaved Light-weight Concrete) plate formed of cement.

  In the lower part of the floor slab 10, a rising portion 2a arranged so as to surround the substantially rectangular ground surface E, a bottom surface of the substantially rectangular floor slab 10, and a substantially rectangular ground surface E surrounded by the substantially rectangular ground surface E A cuboid-shaped underfloor space S is formed.

  A small beam that supports the floor slab may be provided in the middle part of the pair of opposed rising parts 2a. Desirably, the floor slab 10 is not supported by a bundle. In particular, it is desirable that there is no bundle along the inside of the rising portion 2a in contact with the external space of the building.

  In the underfloor space S, the ground surface E may be exposed, and there is a concern that moisture may enter under the floor from the ground surface. Therefore, at least one underfloor ventilation port 3 is provided in the rising portion 2a on one side of the outer periphery of the underfloor space S to ventilate the underfloor space S. When there is a small beam in the middle of the pair of rising portions 2a, one underfloor ventilation port 3 is provided in each of the areas separated by the small beam in the rising portion 2a.

  The underfloor ventilation port 3 is, for example, a rectangular through hole formed so as to communicate the outside and the underfloor space S. The underfloor vent 3 is standardized, for example, in a size of about 100 [mm] in height x 300 [mm] in width.

  The underfloor space S is exposed to outside air because air enters and exits from the underfloor ventilation port 3. Some existing buildings do not have floor insulation, and when the outside temperature is lower than the room temperature, such as in winter, when outside air enters and exits the underfloor space S, the indoor heat escapes through the floor, The temperature may drop, and the floor surface and feet may feel cold. Therefore, in order to improve the livability and the heating and cooling efficiency of the building, a floor insulation reform for reducing heat loss may be installed.

  The heat insulation method of the underfloor space S is applied to, for example, a heat insulation repair work such as a floor heat insulation reform of an existing building having the cloth foundation 2. Since the existing building is occupied by residents, it is desirable that the insulation repair work be carried out without affecting the occupants' lives as much as possible. In the heat insulation method of the underfloor space, there is no influence on living such as moving furniture and the like inside the building, and the heat insulation repair work can be performed from outside the building.

  In the method of heat insulation of the underfloor space, for example, materials of the heat insulating member are carried in from the underfloor ventilation port 3 and are carried out through the underfloor ventilation port 3 until the end of the construction work. A lattice 3a is attached to the underfloor vent 3 so that small animals and the like do not enter the underfloor space S. The lattice 3a is fitted into, for example, an underfloor ventilation port 3 formed in the rising portion 2a. The grid 3a may be provided with a plurality of steel rods juxtaposed beforehand at the time of casting the concrete of the rising portion 2a and integrally provided with the rising portion 2a, and in the case where a net is used instead of the grid 3a. There is also.

  The lattice 3a is removed from the underfloor ventilation port 3, for example, to secure a passage that allows access to the underfloor space S from the external space. When the grid 3a is formed integrally with the underfloor ventilation port 3, the grid 3a is removed by cutting. When the lattice 3a is removed, the underfloor ventilation port 3 becomes a work entrance as well as a carry-in port for the material of the heat insulating member. The edge of the underfloor ventilation port 3 is cured with a sheet-like material to carry in materials and the like of the heat insulating member.

  Next, a method of installing the heat insulating member in the heat insulating structure in the underfloor space will be described. Since the ground surface E is exposed in the underfloor space S, first, a moisture-proof and waterproof sheet member 20 for covering the ground surface E is laid. The sheet body 20 is configured to be carried in from the underfloor ventilation opening 3 and to be deployed and laid on the ground surface E of the underfloor space S.

  As shown in FIG. 3, the sheet body 20 is formed in a bag shape by, for example, welding the periphery of two rectangular polyethylene sheets 21 and 22. The sheet body 20 may be formed by bending one sheet of polyethylene and welding three sides around the sheet, or by welding two sides on both sides in a state where the tubular sheet is crushed. Is also good. The sheet body 20 has a thickness of, for example, about 0.2 [mm].

  A plurality of linear partitions 23 are formed parallel to the short side direction of the two sheets 21 and 22 whose periphery is welded. The partition 23 includes a plurality of linear welding portions 24 formed by welding two sheets 21 and 22 to each other, and an unwelded airway 25. Airways 25 are arranged at predetermined intervals between the plurality of welded portions 24. As a result, a large number of cells 26 are formed adjacent to each other on the sheet body 20 with the axis extending along the short side direction.

  At one end of the two short sides of the sheet member 20, an air inlet 27 that is not welded is provided. When gas flows in from the intake port 27, for example, the cell 26 expands in a substantially columnar shape. Then, the gas flows from each airway 25 of the expanded cell 26 into the adjacent cell 26, and the adjacent cell 26 also expands in a substantially columnar shape. When all the cells 26 expand, the sheet body 20 expands in a mat shape. The length of the sheet body 20 in the longitudinal direction is formed to be, for example, one side length of the ground surface E.

  The sheet body 20 before expansion having such a configuration is wound along the longitudinal direction such that the air inlet 27 appears as an end. The winding direction of the sheet body 20 may be a direction along the short direction. The winding direction is appropriately determined according to the size and shape of the sheet body 20 and the state of the construction place, and the position of the air inlet 27 is also appropriately determined accordingly. Therefore, the air inlet 27 may be provided at an arbitrary position on the long side of the sheet member 20.

  As shown in FIG. 4A, the worker inserts the wound sheet body 20 through the underfloor ventilation port 3. Next, as shown in FIG. 4 (2), the worker connects one end of the hose H to the intake port 27 of the sheet body 20, passes the underfloor ventilation port 3, and connects the other end of the hose H to the building. It is connected to the air outlet of blower B arranged outside. Then, the worker operates the blower B to fill the inside of the sheet body 20 with gas (air) and sequentially inflates the sheet body 20 into a cylindrical shape from the cell 26 on the near side. The gas may be filled into the body 20 using a compressible gas filled in a cylinder, or an incompressible liquid may be filled into the sheet body 20.

  The adjacent cells 26 are sequentially expanded, and the wound sheet body 20 is pushed up by the expanded cells 26 to start rolling on the ground surface E. That is, the operator fills the inside of the sheet body 20 with gas to expand the sheet body 20 and rolls and deploys the sheet body 20 on the ground surface E.

  Then, the gas is caused to flow into the adjacent cells 26 from each airway 25 of the expanded cells 26, all the cells 26 are expanded, and the sheet body 20 is developed in a mat shape. By filling the wound sheet body 20 with air as described above, the sheet body 20 rolls and unfolds and unfolds. In this way, by expanding the wound sheet body 20 while inflating it with gas, even if there are irregularities or undulations on the ground surface E, the sheet body 20 can ride over them and travel on their own.

  The length in the longitudinal direction of the sheet body 20 is formed to be, for example, substantially the length of one side of the ground surface E. The operator lays out, for example, the spread sheet body 20 on the entire ground surface E of the underfloor space S. The operator lays the unfolded sheet body 20 on the ground surface E along at least the peripheral side of the underfloor space S, that is, the inside of the rising portion 2a exposed to the external space of the building.

  At this time, when the position of the unfolded sheet body 20 is deviated from the predetermined position, the operator pushes the sheet body 20 out of the underfloor ventilation port 3 using a stick or the like, or lays down the sheet body 20 at the predetermined position. I do. Since the sheet member 20 developed in a mat shape has rigidity, the position of the sheet member 20 from the outside of the building can be easily adjusted by an operator.

  The operator removes the hose H from the air inlet 27 after laying the sheet member 20. At this time, the intake port 27 does not necessarily have to be closed. That is, the sheet body 20 may be formed into a carpet shape by bleeding air from the air inlet 27. When existing moisture-proof soil-to-soil concrete or moisture-proof sheet is present on the ground surface E, these may be used directly as moisture-proof means, and the laying of the sheet body 20 may be omitted.

  On the sheet body 20, a heat insulating member 30 is installed along the inside of the rising portion 2a (wall on the side of the underfloor space S) in contact with the external space of the building. The heat insulating member 30 is formed by filling and press-fitting a heat insulating material 38 inside the bag body 31 as described later.

  As shown in FIG. 5, the bag body 31 is formed by welding both open ends of a polyethylene sheet formed in a tubular shape. The bag body 31 may be formed into a tube by welding four sides of two band-shaped sheets, or may be formed by bending one sheet and welding three surrounding sides. The bag body 31 has an opening 32 for filling and press-fitting a gas and a heat insulating material described below into the bag body 31.

  A hose H1 for filling and press-fitting a heat insulating material is inserted into the opening 32. The opening 32 is formed so as to open larger than the cross-sectional area of the hose H1. The opening 32 is provided at a position corresponding to the position of the underfloor ventilation port 3.

  The bag 31 expands in a columnar shape when gas or heat insulating material is filled and press-fitted into the inside from the opening 32. The bag body 31 has a substantially cylindrical shape with a diameter of, for example, about 500 to 600 [mm] when inflated. The bag body 31 is installed along the inside of the rising portion 2a in a state in which a heat insulating material is filled and pressed into the inside as described later. The bag body 31 before inflation is in a state of being crushed in a belt shape. The length of the bag body 31 in the longitudinal direction is formed to be, for example, the length of one side of the ground surface E. The length of one side may be determined so that the total length is the length of one side of the ground plane E when the plurality of bags 31 are arranged in the longitudinal direction.

  For example, a guide rod C is attached to one longitudinal side of the bag body 31 before inflation using an adhesive tape T or the like along the longitudinal direction. The guide bar C is attached, for example, to one side of the bag body 31 provided with the opening 32. The operator, for example, folds the bag body 31 appropriately so as to match the height of the underfloor ventilation port 3 and places the uninflated bag body 31 together with the guide rod C from the underfloor ventilation port 3 into the underfloor space S, for example, in the direction of the arrow. Insert along. Then, the operator arranges the bag body 31 along the outer periphery of the underfloor space S.

  As shown in FIG. 6, in this arrangement step, the operator moves the guide bar C along the inside of the rising portion 2a, and arranges the bags 31 inside the rising portion 2a. At this time, the worker adjusts the position of the bag body 31 by pushing or pulling the guide bar C with a rod or the like from the underfloor ventilation opening 3 in a different direction as appropriate.

  The bag bodies 31 are continuously arranged inside the orthogonal rising portions 2a. One or a plurality of bags 31 may be arranged, and if there are small beams, a plurality of bags may be divided at the position of the small beams.

  The guide rod C is left in the underfloor space S while being attached to the bag body 31. After the bag body 31 is arranged, the worker inserts the hose H1 connected to a blower (not shown) from the underfloor ventilation port 3 into the bag body 31 through the opening 32. Thereafter, the worker operates the air blower, first blows only air into the bag body 31 to inflate the bag body 31.

  At this time, the operator adjusts the position of the bag 31 so as not to separate the bag 31 from the inside of the rising portion 2a by holding the guide rod C or the like. The worker confirms whether or not the bag body 31 is arranged at an appropriate position by photographing the inside of the underfloor space S using a camera or the like attached to the tip of the rod and imaging a 360-degree field of view. Can also.

  Next, the operator causes the heat insulating material having fluidity to flow into the inside of the bag body, and fills and press-fits the heat insulating material into the bag body 31 while inflating the bag body. The heat insulating material having fluidity is, for example, a mixed gas in which a gas such as air and a heat insulating material are mixed. Here, as the heat insulating material, for example, a small lump of flocculent fiber having a size that flows inside the hose H1 is used. As the flocculent fiber, for example, cellulose fiber, wood fiber, cotton, wool, glass wool, rock wool and the like are used. As the heat insulating material, not only the cotton-like fiber but also a chip-like or bead-like foamed resin may be used.

  When filling the inside of the bag body 31 with a heat insulating material, moisture may be mixed with the gas. Therefore, it is desirable that the heat insulating material has a moisture absorbing property and a moisture proof property in order to prevent dew condensation and freezing. When a material having low hygroscopicity and moisture-proof properties is used for the heat insulating material, a material having hygroscopicity and humidity control properties such as silica gel or diatomaceous earth may be mixed in the heat insulating material.

  In the process of filling the heat insulating material, the operator arranges the end of the hose H1 so as to reach the region of the inner end of the bag 31. Thereafter, the worker operates the blower, blows a mixed gas of the heat insulating material and the gas into the inside of the bag 31 from the end of the hose H1, and fills and press-fits the heat insulating material from the end of the bag 31. Move in the direction in which hose H1 is pulled out. Thereby, the heat insulating material can be filled and press-fitted from the end of the bag body 31.

  When filling the heat insulating material, the operator discharges the air by leaving a gap without completely closing the opening 32 of the bag body 31. In order to discharge air, the bag body 31 may be provided with a separate air discharge port in addition to the opening 32. The outlet may be provided near the opening 32 in the bag body 31 or may be provided at another position.

  The weight of the bag body 31 increases as the heat insulating material is filled and press-fitted. As the weight of the heat insulating material increases, the portion of the expanded sheet body 20 located at the lower portion of the bag body 31 on which the bag body 31 is placed is crushed and air is discharged. The bag body 31 into which the heat insulating material has been filled and press-fitted, for example, is stretched so as to cover a space between the ground surface E and the lower surface of the floor slab 10, and expands into a substantially cylindrical shape. For example, the bag body 31 is not necessarily inflated into a substantially columnar shape when sandwiched between the ground surface E and the lower surface of the floor slab 10, for example.

  After filling the inside of the bag body 31 with the heat insulating material, the operator pulls out the hose H1 from the opening 32 and closes the opening 32 with an adhesive tape or the like. Through the above steps, the substantially cylindrical heat insulating member 30 is formed inside the rising portion 2a. Since the heat insulating member 30 has elasticity, the shape conforms even when a step is formed on the ground surface E or when a member such as a beam exists above the ground surface E. In addition, since the heat insulating member 30 is pressed against the ground surface E and the lower surface of the floor slab 10 during the expansion process, the heat insulating member 30 is less likely to be displaced without providing a fixing means.

  According to the heat insulating member 30, even if there is a gap between the heat insulating member 30 and the floor slab 10, or if a gap occurs due to aging, if the gap is narrow, air is less likely to convect in the gap. Therefore, a decrease in heat insulation is suppressed. By arranging the heat insulating member 30 in this manner, it is possible to prevent outside air from entering through a gap between the rising portion 2a in contact with the outside air and the outer peripheral wall of the building, and to improve the airtightness of the building. As a result, heat loss due to leakage of the building is reduced. Since the heat insulating member 30 is installed on the sheet member 20, the heat insulating member 30 is protected from damage due to projections on the ground surface E or the like. In addition, since the fixing means is not provided, the bag 31 of the heat insulating member 30 is less likely to be damaged, and the possibility that the heat insulating material filled inside blows into the underfloor space S is reduced.

  As shown in FIG. 7, a heat insulating material is sequentially filled and press-fitted into two bags 31 arranged inside the rising portions 2a on two orthogonal sides to form the heat insulating member 30. At this time, the bag body 31 into which the heat insulating material is filled and press-fitted later expands in accordance with the state of the bag body 31 which has been filled with the heat insulating material first. Depending on the shape of the existing building, the heat insulating member 30 may not be completely continuous along the outer periphery of the underfloor space S or may have a gap.

  Next, the worker installs the ventilation device 40 for discharging the air in the underfloor space S into the underfloor ventilation port 3. The ventilation device 40 is installed in the underfloor ventilation opening 3 from the outside of the building, for example. The ventilation device 40 is formed, for example, in accordance with the size of the opening of the underfloor ventilation port 3. The ventilation device 40 includes, for example, a fan 41 that forcibly exhausts the air in the underfloor space S to the outside of the building. For example, at least one underfloor ventilation port 3 is provided for one unit of underfloor space S divided by rising portions 2a and small beams.

  It is preferable that the ventilator 40 is installed in the underfloor ventilation port 3 installed below a non-heating room such as a washroom or a toilet, for example. Further, it is preferable that the ventilating device 40 be provided in a place where the operating noise during operation is not bothersome. Moreover, it is preferable that the ventilation device 40 is provided near an existing power supply (such as a power supply for a water heater).

  The ventilator 40 does not need to be installed in all the underfloor vents 3, and the other underfloor vents 3 where the ventilator 40 is not installed are externally provided with a lid 45 to close the opening. In order to ensure the airtightness of the lid 45, the worker may enter the underfloor space S from the underfloor inspection port in the living room, for example, and block the underfloor ventilation port 3 from behind the lid 45 using foamed resin or the like. In addition, the worker may fill the gap between the ventilation device 40 or the lid 45 and the underfloor ventilation opening 3 with a foamed resin or the like in order to ensure airtightness around the ventilation device 40 or the lid 45. If it is difficult to enter the underfloor space S from the underfloor inspection port, these operations may be performed from outside the building.

  After the installation of the lid 45, the ventilation device 40 is operated. When the space between the ventilation device 40 and the underfloor space S is sealed by the heat insulating member 30, the heat insulating member 30 may be deformed to secure an airway, or a pipe or the like may be provided between the floor slab 10 and the heat insulating member 30. An airway may be secured across the. Moreover, you may install the bag body 31 so that the heat insulation member 30 may be divided | segmented at the position of the underfloor ventilation opening 3 at the time of construction of the heat insulation member 30.

  When the ventilation device 40 is operated to exhaust the air in the underfloor space S to the outside of the building, the air pressure in the underfloor space S decreases and the air in the living room of the building is supplied to the underfloor space S from the gap in the floor slab 10. . Then, the air pressure in the living room of the building is lower than the external air pressure, so that external air is supplied into the living room from the ventilation holes and gaps in the building. By operating the ventilation device 40 in this manner, ventilation of the air in the building is performed.

  In addition, by operating the ventilation device 40, in addition to ventilating the air in the building, introducing the air-conditioned air in the living room into the underfloor space to bring the temperature of the air under the floor close to the temperature of the air in the living room. Can be.

  That is, by operating the ventilator 40, for example, in the winter, the air in the air-conditioned room is introduced into the underfloor space S, and the air in the underfloor space S is heated. The air in the underfloor space S is hardly cooled because the surroundings are insulated by the heat insulating member 30. Thereby, the temperature in the underfloor space S rises, the heat of the air in the underfloor space S is conducted to the floor slab 10, and the temperature of the floor surface in the living room becomes a state in which the heat insulating member 30 and the ventilation device 40 are not installed. As a result, the floor surface can be maintained at a comfortable temperature.

  In particular, as described above, the ventilation device 40 is installed in the underfloor ventilation port 3 below the non-heating room such as the washroom or the toilet, so that the temperature of the floor of the washroom or the toilet can be maintained comfortably. Further, since the air conditioned in the living room by the ventilation device 40 is introduced into the underfloor space S, the underfloor space is maintained in a high-humidity environment for a long time due to excess moisture generated by accumulation of moisture in the underfloor space S. Is prevented. As described above, the heat insulating structure is installed in the underfloor space S of the foundation of the existing building by the process of installing the sheet body 20, the heat insulating member 30, and the ventilation device 40.

  As described above, according to the method of insulating the underfloor space, the heat insulating member 30 is installed in the underfloor space S from the underfloor ventilation port 3 provided on the cloth foundation 2 from outside the building, so that the living room is not affected. Insulation of the underfloor space can be performed. In other words, according to the method of insulating the underfloor space, no burden is imposed on the occupants of the building, the living room is not polluted, there is no need to cure the living room, and the construction can be performed even when the resident is absent. . Further, since the heat insulating member 30 is filled with the heat insulating material inside the bag body 31, it is easy to collect the heat insulating material 30 when performing the construction for replacing the heat insulating material.

  The technical scope of the present invention is not limited to the above embodiments, and includes various modifications of the above embodiments without departing from the spirit of the present invention. For example, the heat insulating material used for the heat insulating method of the underfloor space may be mixed with an insect repellent for controlling pests such as termites. Further, air cooled by the geothermal heat of the ground surface E of the underfloor space S may be introduced into the living room by rotating the fan 41 of the ventilation device 40 in the summer. In addition, the above-described method of insulating the underfloor space has been described as being applied to an existing building, but may be applied to a new building.

DESCRIPTION OF SYMBOLS 1 ... foundation, 2 ... cloth foundation, 2a ... rising part, 2b ... footing part, 3 ... underfloor ventilation opening, 3a ... lattice, 10 ... floor slab, 20 ... sheet body, 21, 22 ... sheet, 24 ... welding part, 25 ... airway, 26 ... cell, 27 ... intake port, 30 ... heat insulating member, 31 ... bag, 32 ... opening, 38 ... heat insulating material, 40 ... ventilator, 41 ... fan, 45 ... lid, B ... blower, C: guide rod, E: ground surface, H, H1: hose, S: underfloor space, T: adhesive tape

Claims (10)

An insulation method for an underfloor space having an underfloor ventilation opening at a rising portion of a foundation of a building,
An insertion step of inserting the bag that expands in a columnar shape when filled with fluid from the underfloor ventilation port into the underfloor space in a state before inflation,
An arranging step of arranging the bag along the outer periphery of the underfloor space;
A filling step of filling the inside of the bag body with fluidity from the underfloor vent to form a pillar-shaped heat insulating member by filling the heat insulating material with fluidity.
Insulation method for underfloor space. In the inserting step, after attaching a guide rod to the bag body before inflation, insert the bag together with the guide rod from the underfloor ventilation port,
The method for heat insulation of an underfloor space according to claim 1. In the arranging step, the guide rod is moved along the inside of the rising portion, and the bag is juxtaposed inside the rising portion.
The method for heat insulation of an underfloor space according to claim 2. In the filling step, a mixed gas in which a gas and a heat insulating material are mixed is caused to flow into the inside of the bag, and the inside of the bag is filled with the heat insulating material while inflating the bag.
The heat insulation method for an underfloor space according to any one of claims 1 to 3. In the filling step, a hose connected to a blower is inserted into the bag body, and a tip of the hose is arranged in an end region inside the bag body. Moving the gas in the direction of pulling out the hose while blowing the mixed gas of the heat insulating material and the gas inside the bag body and filling the heat insulating material,
The heat insulation method for an underfloor space according to any one of claims 1 to 4. Prior to the inserting step, further comprising a laying step of laying a moisture-proof sheet body that expands into a mat shape by filling with gas on the ground surface of the underfloor space,
In the laying step, after inserting the wound sheet body before expansion from the underfloor ventilation port, the inside of the sheet body is filled with gas to expand the sheet body, and the sheet body is grounded. Roll and deploy on the surface and lay it down,
The heat insulation method for an underfloor space according to any one of claims 1 to 5. After the filling step, while installing a ventilator for discharging the air of the underfloor space in the underfloor vent, an installation step of closing another underfloor vent provided on the foundation that communicates with the outside with a lid. Further prepare,
The heat insulation method for an underfloor space according to any one of claims 1 to 6. After the installation step, the ventilation device is operated, and the air inside the underfloor space is discharged to the outside, and further includes a ventilation step of introducing room air under the floor,
The method of insulating a floor space according to claim 7. A tubular bag,
Heat insulation material filled inside the bag body,
The bag body expands in a columnar shape in a state where the heat insulating material is filled, and is juxtaposed in an underfloor space at a rising portion of a foundation along an outer periphery of the underfloor space,
Insulation structure for underfloor space. Further comprising a moisture-proof sheet body laid on the ground surface of the underfloor space so that the heat insulating member is placed thereon,
The sheet body is developed in a mat shape by filling with gas,
The heat insulation structure of the underfloor space according to claim 9.

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