JP7193955B2 - Heat insulation method for underfloor space and heat insulation structure for underfloor space - Google Patents

Description

The present invention relates to an underfloor space insulation method and an underfloor space insulation structure for insulating the underfloor of a building.

BACKGROUND ART In recent years, an underfloor heat insulation structure for improving underfloor heat insulation properties of a building is known for the purpose of improving the living environment and energy efficiency of the building (for example, Patent Literature 1). In this underfloor heat insulation structure, a plate-shaped heat insulating material is arranged between the lower surface of the floor material and the ground (concrete surface) to achieve underfloor heat insulation.

Japanese Patent Application Laid-Open No. 2001-011997

In order to improve the insulation performance of existing buildings where floor insulation is not installed, floor insulation renovation is performed to install insulation under the floor. The technology described in Patent Literature 1 is supposed to construct an underfloor insulation structure for a new building, and if it is applied to the floor insulation renovation of an existing building, it will require large-scale work such as peeling off the floor material. It requires a lot of construction work, which may lengthen the construction period and increase the construction cost.

Therefore, the present invention has been made in consideration of the above-mentioned circumstances, and it is possible to easily perform floor insulation remodeling in an existing building to reduce heat loss from the floor and improve insulation performance. , the object is to provide a heat insulation method and a heat insulation member for an underfloor space.

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

A method for insulating an underfloor space according to one aspect of the present invention is a method for insulating an underfloor space having an underfloor ventilation opening at a rising portion of the foundation of a building, wherein the bag expands into a columnar shape when filled with a fluid. An insertion step of inserting the bag into the underfloor space from the underfloor ventilation port in the previous state, an arrangement step of arranging the bag along the outer circumference of the underfloor space, and an inside of the bag from the underfloor ventilation port and a filling step of filling a heat insulating material having fluidity into the space to form a columnar heat insulating member.

According to this aspect, after a worker positioned outside the building inserts the uninflated bag through the underfloor ventilation port, the inside of the bag is filled with a heat insulating material in the underfloor space to inflate the bag. By forming the heat insulating member by using the heat insulating material, it is possible to construct the floor heat insulation renovation without affecting the living room of the building. In addition, since the heat insulating member is installed in the outer peripheral portion of the underfloor space, which is susceptible to the influence of the outside air, it is possible to reduce the amount of heat insulating material used and reduce construction costs.

A method for insulating an underfloor space according to an aspect of the present invention is such that, in the inserting step, a guide rod is attached to the bag body before inflation, and then 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 rod to the bag, it is possible to easily insert the bag together with the guide rod into the underfloor space through the underfloor ventilation opening.

A method for insulating an underfloor space according to an aspect of the present invention is configured such that, in the arranging step, the guide rod is moved along the inside of the rising portion, and the bag body is arranged side by side inside the rising portion. It is

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

In the method for insulating an underfloor space 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 interior of the bag, and the bag is inflated. The inside of the bag is configured to be filled with the heat insulating material.

According to this aspect, the mixed gas in which the gas and the heat insulating material are mixed is caused to flow into the inside of the bag body, so that the bag body is inflated by blowing of the gas, and the heat insulating material mixed with the gas is introduced into the bag body. By flowing into and accumulating inside, the heat insulating material can be easily filled and press-fitted into the inside of the bag. Moreover, according to this aspect, since the inside of the bag is filled with the heat insulating material, the recovery method can be facilitated when the heat insulating member is replaced.

A method for insulating an underfloor space according to an aspect of the present invention is such that, in the filling step, a hose connected to a blower is inserted into the interior of the bag, and a tip of the hose is inserted into an end region of the interior of the bag. , the air blower is operated to blow a mixed gas of the heat insulating material and gas from the hose into the inside of the bag body to move the hose in a pulling direction while filling the heat insulating material. is configured to

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

The method for insulating an underfloor space according to an aspect of the present invention further includes, prior to the inserting step, a laying step of laying a moisture-proof sheet body that expands into a mat-like shape by being filled with gas on the ground surface of the underfloor space. In the laying step, after inserting the rolled sheet body before inflation 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 expanded. It is configured to be deployed and laid 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 body laid on the ground surface can be inserted through the underfloor ventilation opening. Further, since the sheet body before inflation is wound, the bag body can be inserted into the underfloor space through the underfloor ventilation opening. Then, when the inside of the bag is filled with gas, the bag expands into a mat shape, so that the sheet can be laid on the ground surface. In addition, by deploying the wound sheet body while inflating it with gas, even if there are irregularities or undulations on the ground surface, the sheet body can overcome them and be self-propelled.

In the method for insulating an underfloor space according to one aspect of the present invention, after the filling step, a ventilation device for discharging the air in the underfloor space is installed in the underfloor ventilation opening, and the ventilation device is installed in the foundation communicating with the outside. It is configured to further include an installation step of closing the other underfloor ventilation opening with a lid.

According to this aspect, the underfloor space is prevented from being kept in a high-humidity environment for a long time due to excess moisture by blocking the underfloor space from the outside air with the lid and discharging the air in the underfloor space with the ventilator. be able to.

In the method for insulating an underfloor space according to one aspect of the present invention, after the installation step, the ventilation device is operated to exhaust the air inside the underfloor space to the outside and to introduce indoor air into the underfloor. 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, and the floor surface can be kept comfortable. temperature can be maintained.

A heat insulating structure for an underfloor space according to an aspect of the present invention includes a tubular bag body and a heat insulating material filled inside the bag body, and the bag body is filled with the heat insulating material. is a heat insulating member that expands into a columnar shape in the underfloor space and is placed side by side on the rising portion of the foundation along the outer circumference of the underfloor space in the underfloor space.

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

The insulation structure for an underfloor space according to an aspect of the present invention further includes a moisture-proof sheet body laid on the ground surface of the underfloor space so that the heat insulating member is placed thereon, wherein the sheet body contains gas It is configured to develop 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 can be laid on the ground surface through the underfloor ventilation opening from the outside of the building without affecting the interior of the living room. can be done.

According to one aspect of the present invention, an underfloor space insulation method and an underfloor space insulation structure are applied to reduce heat loss from the floor of an existing building, thereby simplifying floor insulation renovation for improving insulation performance. 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 insulation method of the underfloor space which concerns on embodiment of this invention is applied. FIG. 2 is a cross-sectional view showing an example of the configuration of a continuous footing to which the underfloor space insulation method is applied. FIG. 2 is a plan view showing an example of the configuration of a sheet body laid on the ground surface of the underfloor space; It is a figure which shows the process of the laying process of a sheet|seat body. FIG. 4 is a plan view showing an example of the configuration of a bag arranged inside the rising portion of the continuous foundation; It is a perspective view which shows an example of the state which has arrange|positioned the bag body in the underfloor space. It is a figure which shows the state by which the inside of the bag was filled with the heat insulating material, and the heat insulating member was formed.

Embodiments of a method for insulating an underfloor space and a heat insulating structure for an underfloor space according to the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, some existing building foundations 1 are not provided with floor insulation. The insulation method for the underfloor space is applied to, for example, the continuous foundation 2 to perform floor insulation renovation. A heat insulating member, which will be described later, is installed, for example, in the underfloor space S inside the continuous foundation 2 .

The continuous foundation 2 is a foundation made of concrete in which a rising portion 2a erected upward from a ground surface E is formed in a continuous wall shape. The continuous foundation 2 has an inverted T-shaped cross section. The continuous foundation 2 includes a rising portion 2a erected in a vertical direction, and a footing portion 2b formed perpendicular to the rising portion 2a when viewed from the cross-sectional direction and extending along the bottom of the rising portion 2a. The footing portion 2b is buried in the ground below the ground level E. As shown in FIG.

The rising portion 2a is provided, for example, according to the shape of the floor surface 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-shaped floor slab 10 when viewed in the planar direction. The rising portion 2a is formed so that the height from the ground surface E is about 400 [mm], for example. 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) board made of cement.

At the bottom of the floor slab 10, there is a substantially rectangular ground surface E surrounded by a rising portion 2a surrounding the substantially rectangular ground surface E, the bottom surface of the substantially rectangular floor slab 10, and the substantially rectangular ground surface E. A cuboid-shaped underfloor space S is formed.

A small beam for supporting the floor slab may be provided at the intermediate portion of the pair of opposing rising portions 2a. Preferably, the floor slab 10 is not supported in bundles. In particular, it is desirable that no bundles are present along the inner side of the riser 2a that contacts the exterior space of the building.

The ground surface E may be exposed in the underfloor space S, and there is concern that moisture may enter the underfloor 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 circumference of the underfloor space S to ventilate the underfloor space S. As shown in FIG. When there is a small beam in the middle portion of the pair of rising portions 2a, one underfloor ventilation port 3 is provided in each range divided 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 allow the underfloor space S to communicate with the outside. The underfloor ventilation opening 3 is standardized, for example, to have a size of about 100 [mm] in height x 300 [mm] in width.

The underfloor space S is exposed to the outside air because air enters and exits from the underfloor ventilation port 3 . Some existing buildings do not have floor insulation, and when the outdoor temperature is lower than the indoor temperature, such as in winter, when the outdoor air enters and exits the underfloor space S, the indoor heat escapes through the floor. The temperature drops, and the floor surface and feet may feel cold. Therefore, in order to improve the habitability and heating and cooling efficiency of the building, floor insulation renovation is sometimes implemented to reduce heat loss.

The insulation method for the underfloor space S is applied, for example, to insulation repair work such as floor insulation renovation of an existing building having a continuous foundation 2 . Residents live in existing buildings, so it is desirable that insulation repair work be carried out without affecting the lives of residents as much as possible. In the underfloor space insulation method, there is no impact on living such as moving furniture inside the building, and it is possible to carry out insulation repair work from the outside of the building.

In the method of insulating the underfloor space, for example, the material for the heat insulating member is brought in through the underfloor ventilation opening 3 and carried through the underfloor ventilation opening 3 until the construction work is completed. A lattice 3a is attached to the underfloor ventilation port 3 to prevent small animals from entering the underfloor space S. The lattice 3a is, for example, fitted into the underfloor ventilation opening 3 formed in the rising portion 2a. The grid 3a may be provided integrally with the rising portion 2a by arranging a plurality of steel rods in parallel in advance when the concrete of the rising portion 2a is poured, or when a net is used instead of the grid 3a. There is also

The grid 3a is removed from the underfloor ventilation opening 3, for example, to ensure a passage that allows access to the underfloor space S from the exterior space. When the grid 3a is formed integrally with the underfloor ventilation port 3, the grid 3a is removed by cutting. When the grid 3a is removed, the underfloor ventilation opening 3 becomes a port for carrying in materials for the heat insulating member and a working space. The edge of the underfloor ventilation port 3 is covered with a sheet-like material for carrying in materials for heat insulating members.

Next, a method for installing a heat insulating member in the heat insulating structure of 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 body 20 for covering the ground surface E is laid. The sheet body 20 is carried in through the underfloor ventilation opening 3 and is configured to be laid out on the ground surface E of the underfloor space S.

As shown in FIG. 3, the sheet body 20 is, for example, formed into a bag shape by welding the peripheries of two rectangular polyethylene sheets 21 and 22 . The sheet body 20 may be formed by bending a single polyethylene sheet and welding three sides of the periphery, or by crushing a tubular sheet and welding two sides on both sides. good too. The sheet body 20 has a thickness of, for example, about 0.2 [mm].

A plurality of linear partitions 23 are formed in parallel with the short side direction of the two sheets 21 and 22 whose peripheries are welded. The partition 23 includes a plurality of linear welded portions 24 formed by welding two sheets 21 and 22 together, and an airway 25 that is not welded. Airways 25 are arranged at predetermined intervals between the plurality of welded portions 24 . Thus, the sheet body 20 is formed with a large number of adjacent cells 26 each having an axis along the short side direction.

An intake port 27 that is not welded is provided on one end side of the two short sides of the sheet body 20 . When gas is introduced from the intake port 27, the cell 26 expands into a substantially columnar shape, for example. Then, gas flows from each airway 25 of the expanded cell 26 into the adjacent cell 26, and the adjacent cell 26 is also expanded into a substantially cylindrical shape. When all the cells 26 expand, the sheet body 20 expands like a mat. The length of the sheet body 20 in the longitudinal direction is, for example, the length of one side of the ground surface E. As shown in FIG.

The sheet body 20 before inflation having such a structure is wound along the longitudinal direction so that the intake port 27 appears as an end. The winding direction of the sheet body 20 may be the direction along the lateral direction. The winding direction is appropriately determined according to the size and shape of the sheet body 20 and the condition of the construction site, and the position of the intake port 27 is also appropriately determined accordingly. Therefore, the intake port 27 may be provided at any position on the long side of the sheet body 20 .

As shown in FIG. 4(1), the operator inserts the wound sheet body 20 from the underfloor ventilation opening 3. As shown in FIG. 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 it through the underfloor ventilation port 3, and connects the other end of the hose H to the building. Connect to the blower port of the blower B arranged outside. Then, the operator activates the blower B to fill the inside of the sheet body 20 with gas (air), and sequentially inflate the sheet body 20 into a cylindrical shape from the cell 26 on the front side. The gas may be filled inside the body 20 using a compressible gas filled in a cylinder, or may be filled inside the sheet body 20 with an incompressible liquid.

Adjacent cells 26 are sequentially inflated, and the wound sheet body 20 is pushed up by the inflated cells 26 and starts to roll on the ground surface E. - 特許庁That is, the operator fills the inside of the sheet body 20 with gas to inflate the sheet body 20, and rolls the sheet body 20 on the ground surface E to spread and lay it.

Then, gas is allowed to flow into the adjacent cells 26 from each airway 25 of the expanded cells 26 to expand all the cells 26 and spread the sheet body 20 into a mat shape. By filling air into the wound sheet body 20 in this manner, the sheet body 20 rolls and unfolds while self-propelled. In this way, by deploying the wound sheet body 20 while inflating it with gas, even if the ground surface E has irregularities or undulations, the sheet body 20 can ride over them and run by itself.

The length of the sheet body 20 in the longitudinal direction is, for example, substantially the length of one side of the ground surface E. As shown in FIG. The worker lays the unfolded sheet body 20 over the entire ground surface E of the underfloor space S, for example. The worker lays the unfolded sheet body 20 on the ground surface E along at least the peripheral side of the underfloor space S, that is, along the inner side of the rising portion 2a exposed to the exterior space of the building.

At this time, if the position of the unfolded sheet body 20 is deviated from the predetermined position, the operator pushes the sheet body 20 into the predetermined position from the underfloor ventilation opening 3 using a rod or the like, or draws the sheet body 20 to the predetermined position. do. Since the sheet body 20 developed in the form of a mat has rigidity, a worker can easily adjust the position from the outside of the building.

The operator removes the hose H from the intake port 27 after laying the sheet body 20 . At this time, the intake port 27 does not necessarily have to be closed. In other words, the sheet body 20 may have a carpet-like shape when the air is released from the intake port 27 . If existing moisture-proof floor concrete or a moisture-proof sheet exists on the ground surface E, these may be used as they are as moisture-proof means, and the laying of the sheet body 20 may be omitted.

A heat insulating member 30 is installed on the sheet body 20 along the inside of the rising portion 2a (the 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 into the inside of the bag body 31 as will be described later.

As shown in FIG. 5, the bag body 31 is formed by welding the open ends of a tubular polyethylene sheet. The bag body 31 may be formed by welding four sides of two strip-shaped sheets to form a tube, or may be formed by bending one sheet and welding three sides around it. The bag body 31 is formed with an opening 32 for filling and press-fitting the inside of the bag body 31 with a gas and a heat insulating material, which will be described later.

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 body 31 expands in a columnar shape when gas or a heat insulating material is filled and pressurized from the opening 32 . When inflated, the bag body 31 assumes a substantially columnar shape with a diameter of, for example, approximately 500 to 600 [mm]. The bag body 31 is installed along the inner side of the rising portion 2a in a state in which a heat insulating material is filled and press-fitted therein, as will be described later. Before being inflated, the bag body 31 is in a state of being crushed into a belt shape. The length of the bag body 31 in the longitudinal direction is, for example, the length of one side of the ground surface E. As shown in FIG. The length of one side may be determined so that the total length is equal to the length of one side of the ground surface E when the plurality of bags 31 are arranged in the longitudinal direction.

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

As shown in FIG. 6, in this arranging step, the operator moves the guide rod C along the inner side of the rising portion 2a to arrange the bags 31 side by side inside the rising portion 2a. At this time, the operator adjusts the position of the bag body 31 by pushing or pulling the guide rod C using a rod or the like from the underfloor ventilation openings 3 in different directions.

The bags 31 are continuously arranged inside the perpendicular rising portions 2a. One or a plurality of bags 31 may be arranged, or if a small beam exists, it may be divided at the position of the small beam and a plurality of bags may be arranged.

The guide rod C is left in the underfloor space S while attached to the bag body 31 . After the bag 31 is placed, the operator inserts the hose H1 connected to the blower (not shown) into the bag 31 through the opening 32 from the underfloor ventilation port 3 . After that, the operator operates the air blower to blow only air into the inside of the bag body 31 to inflate the bag body 31 .

At this time, the worker adjusts the position of the bag body 31 by holding the guide rod C or the like so that the bag body 31 is not isolated from the inside of the rising portion 2a. The operator photographs the underfloor space S using a 360-degree field-of-view camera or the like attached to the tip of the rod, thereby confirming whether or not the bag body 31 is arranged at an appropriate position. can also

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

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

In the process of filling the heat insulating material, the operator arranges the tip of the hose H1 so as to reach the inner end area of the bag body 31 . After that, the operator operates the air blower to blow a mixture of the insulating material and the gas into the bag 31 from the tip of the hose H1, filling and pressurizing the insulating material from the end of the bag 31. Move in the direction to pull out the hose H1. 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 does not completely close the opening 32 of the bag 31 but leaves a gap to let the air out. In order to discharge air, the bag body 31 may be provided with an air discharge port in addition to the opening 32 . The discharge port may be provided in the vicinity of the opening 32 in the bag body 31, or may be provided at another position.

The weight of the bag 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 inflated sheet 20 positioned below the bag 31 on which the bag 31 is placed is crushed and the air is discharged. The bag body 31 filled with and press-fitted with a heat insulating material stretches, for example, so as to block the space between the ground surface E and the lower surface of the floor slab 10 and expands into a substantially columnar shape. For example, the bag body 31 may be sandwiched between the ground surface E and the lower surface of the floor slab 10 and may not necessarily expand into a substantially cylindrical shape.

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 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 of the heat insulating member 30 fits well even if there is a step on the ground surface E or if a member such as a beam exists above. Since the heat insulating member 30 is crimped to the ground surface E and the lower surface of the floor slab 10 in the process of expansion, 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 a gap occurs due to aging, if the gap is narrow, it is difficult for air to convect in the gap. Therefore, deterioration in heat insulation is suppressed. By arranging the heat insulating member 30 in this way, it is possible to prevent outside air from entering through the gap between the rising portion 2a in contact with the outside air and the outer peripheral wall of the building, thereby improving the airtightness of the building. This reduces heat loss through building leakage. Since the heat insulating member 30 is installed on the sheet body 20, it is protected from damage due to projections of the ground surface E or the like. Further, since no fixing means is provided, the bag body 31 of the heat insulating member 30 is less likely to be damaged, and the heat insulating material filled inside is less likely to blow out into the underfloor space S.

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

Next, the worker installs the ventilation device 40 for discharging the air in the underfloor space S to the underfloor ventilation port 3 . The ventilation device 40 is installed in the underfloor ventilation port 3 from the outside of the building, for example. The ventilator 40 is formed according to the size of the opening of the underfloor ventilation port 3, for example. 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. At least one underfloor ventilation opening 3 is installed for each unit of underfloor space S partitioned by, for example, the rising portion 2a or the beam.

The ventilator 40 is preferably installed, for example, in an underfloor ventilation port 3 installed below a non-warming room such as a washroom or a toilet. Moreover, it is preferable that the ventilator 40 is installed in a place where the operating noise during operation is not noticeable. Moreover, it is preferable that the ventilator 40 be 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 ventilation openings 3, and the other underfloor ventilation openings 3 in which the ventilator 40 is not installed are closed by installing lids 45 from the outside. In order to ensure the airtightness of the lid 45, for example, the operator may enter the underfloor space S through the underfloor inspection opening in the living room and close the underfloor ventilation opening 3 from the back side of the lid 45 using foamed resin or the like. Further, the operator may fill the gap between the ventilation device 40 or the lid 45 and the underfloor ventilation port 3 with foamed resin or the like in order to ensure the airtightness around the ventilation device 40 or the lid 45 . Moreover, these operations may be performed from the outside of the building when it is difficult to enter the underfloor space S through the underfloor inspection door.

After installing the lid 45, the ventilator 40 is operated. If the space between the ventilator 40 and the underfloor space S is sealed by the heat insulating member 30, the heat insulating member 30 may be deformed to secure the airway, or a pipe or the like may be inserted between the floor slab 10 and the heat insulating member 30. may be used to secure the airway. Moreover, the bag body 31 may be installed so that the heat insulating member 30 is divided at the position of the underfloor ventilation opening 3 when the heat insulating member 30 is constructed.

When the air in the underfloor space S is exhausted to the outside of the building by operating the ventilation device 40, the air pressure in the underfloor space S is lowered and the air in the living room of the building is supplied to the underfloor space S through the gaps between the floor slabs 10. . As a result, the atmospheric pressure inside the living room of the building is lower than the atmospheric pressure outside, so outside air is supplied into the living room through the ventilation openings and gaps of the building. By operating the ventilation device 40 in this way, the air in the building is ventilated.

In addition to ventilating the air in the building by operating the ventilation device 40, the air-conditioned air in the living room is introduced into the underfloor space to bring the temperature of the underfloor air close to the temperature of the air in the living room. can be done.

That is, by operating the ventilation device 40, for example, in winter, the air in the living room that has been air-conditioned is introduced into the underfloor space S, and the air in the underfloor space S is warmed. The air in the underfloor space S is hard to cool because the periphery is insulated by the heat insulating member 30. - 特許庁As a result, 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 drops to a state where the heat insulating member 30 and the ventilation device 40 are not installed. and keep the floor at a comfortable temperature.

In particular, since the ventilator 40 is installed in the underfloor ventilation port 3 at the bottom of the non-heating room such as the washroom and the toilet as described above, the temperature of the floor surface of the washroom and the toilet is kept comfortable. In addition, since the air that has been conditioned in the living room by the ventilation device 40 is introduced into the underfloor space S, the excess moisture generated by the accumulation of moisture in the underfloor space S keeps the underfloor space in a high-humidity environment for a long time. is prevented. As described above, a heat insulating structure is constructed 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 underfloor space insulation method, the heat insulating member 30 is installed in the underfloor space S from the underfloor ventilation opening 3 provided in the continuous foundation 2 from the outside of the building, so that it does not affect the living room. Insulation of the underfloor space can be carried out. That is, according to the insulation method for the underfloor space, it does not burden the residents of the building, does not contaminate the living room, does not require curing of the living room, and can be constructed even when the resident is absent. . In addition, since the heat insulating member 30 is filled with the heat insulating material inside the bag body 31, it becomes easy to recover the heat insulating material when performing construction work to replace the heat insulating material.

The technical scope of the present invention is not limited to the above-described embodiments, but includes various modifications of the above-described embodiments within the scope of the present invention. For example, the heat insulating material used for insulating the underfloor space may be mixed with an insect repellent for exterminating pests such as termites. Further, by rotating the fan 41 of the ventilation device 40 in the reverse direction in summer, the air cooled by the geothermal heat of the ground surface E of the underfloor space S may be introduced into the living room. Moreover, although the method for insulating the underfloor space described above is applied to an existing building, it 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 (8)

A method for insulating an underfloor space having an underfloor ventilation opening at a rising portion of a building foundation,
an inserting step of inserting a bag that expands into a columnar shape when filled with a fluid into the underfloor space through the underfloor ventilation opening in a state before expansion;
an arrangement step of arranging the bag along the outer periphery of the underfloor space;
a filling step of filling the interior of the bag with a heat insulating material having fluidity from the underfloor ventilation port to form a columnar heat insulating member;
How to insulate the underfloor space. 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;
The method for insulating an underfloor space according to claim 1. In the arranging step, the guide rod is moved along the inner side of the rising portion, and the bag body is arranged side by side on the inner side of the rising portion.
The method for insulating 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 introduced into the bag, and the heat insulating material is filled inside the bag while expanding the bag.
The method for insulating an underfloor space according to any one of claims 1 to 3. In the filling step, a hose connected to an air blower is inserted into the bag, and the tip of the hose is placed in an end region inside the bag, and then the air blower is operated to operate the hose. blowing a mixed gas of the heat insulating material and gas into the inside of the bag from the air, and moving the hose in a direction to pull out while filling the heat insulating material;
The method for insulating an underfloor space according to any one of claims 1 to 4. Further comprising, before the inserting step, a laying step of laying, on the ground surface of the underfloor space, a moisture-proof sheet that expands in a mat-like manner by being filled with gas;
In the laying step, after inserting the rolled sheet body before inflation from the underfloor ventilation opening, the inside of the sheet body is filled with gas to expand the sheet body, and the sheet body is placed on the ground. Lay it by rolling it on the surface and unfolding it.
A method for insulating an underfloor space according to any one of claims 1 to 5. After the filling step, an installation step of installing a ventilation device for discharging the air in the underfloor space in the underfloor ventilation port and closing the other underfloor ventilation port provided in the foundation communicating with the outside with a lid. further prepare,
A method for insulating an underfloor space according to any one of claims 1 to 6. After the installation step, a ventilation step of operating the ventilation device to discharge the air inside the underfloor space to the outside and introduce the indoor air into the underfloor.
The method for insulating an underfloor space according to claim 7.

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