JP2001248244A - Underfloor ventilation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underfloor ventilation method capable of ensuring an effective underfloor ventilation applied to a footing packing building method having earthquake resistance and a footing heat insulating building method. SOLUTION: In the underfloor ventilation method provided to the footing packing building method, an exhaust port 1b connected to an outdoor side 5 from below the floor 6 is provided to at least one place of a footing wall 1, a ventilation device having one outlet 15 and a plurality of suction ports 16 are arranged downward of the floor, and the underfloor ventilation method capable of being exhausted to the outdoor side from the exhaust port through an outlet pipe 15a from the outlet, connecting a suction pipe 16a from the suction port in a specific place and being sucked from the specific place below the indoor floor through the other end port of the suction pipe is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is applied to a base packing building system and a base heat insulating building system having earthquake resistance.
The present invention relates to an underfloor ventilation method for ensuring effective underfloor ventilation.

[0002]

2. Description of the Related Art A conventional underfloor ventilation method is shown in FIG.
As shown in the above, in the basic ventilation system, which is mainly used for wooden houses and has a ventilation opening (40) on the concrete foundation wall (1), the fabric foundation standing on a concrete foundation such as a footing is used. A plurality of vents with a sufficiently wide cross section equipped with a lattice (40a) that protects the invasion of rats, etc. are provided by forming recesses at predetermined locations on the concrete foundation wall (1) The base (2) is fixed to the base wall using fixing members such as anchor bolts, and a base plane (1a) made of moisture-proof concrete, also called a solid base, is provided on the indoor side of the base wall. A wall (3) for blocking the outdoors is erected on the upper side, a floor (6) is fixed on the side surface, and a floor receiving member (1c), also called a floor bundle, is erected at a predetermined place on the base plane indoors. To support the underfloor, and install a ventilation fan inside the ventilation opening There is an under-floor ventilation methods that can also be Bei.

The underfloor ventilation method in the prior art, as shown in FIG. 7, employs a base packing construction method mainly used for a wooden house, and a buffer made of resin or the like at a predetermined interval on a concrete base wall (1). A wooden base or the like (2) of a building is fixed to the foundation wall using a fixing member via a plurality of packings (4) having a property, and a foundation made of moisture-proof concrete or the like is provided on the indoor side of the foundation wall. A flat surface (1a) is provided, a wall (3) for blocking the outdoors is erected on the base, a floor (6) is fixed on the side surface, and a floor receiving member is provided at a predetermined position on the base plane indoors. (1c) is erected, and the under-floor is supported on the floor receiving member at predetermined intervals through a plurality of the packings, and the thickness of the packing is smaller than the width of the base wall or the floor receiving member. Through the gap between adjacent packings, under the floor of the foundation wall and outside, and Both sides under the floor of the floor receiving member communicate with each other, and outside air flows in from the adjacent packing gap on the foundation wall, and under the indoor floor, the adjacent packing gap on the floor receiving member and the adjacent packing gap are formed. There has been an underfloor ventilation method in which the inflow outside air flows through the gap between the floor receiving members and ventilation is performed.

The underfloor ventilation method in the prior art, as shown in FIG. 8, employs a concrete insulation foundation system used for concrete buildings such as concrete condominiums. A concrete wall (3) integrally formed with a heat insulating material is formed on the wall (1), and a foundation plane (1a) made of moisture-proof concrete is provided on the indoor side of the foundation wall.
A concrete floor receiving member (1c) is erected at a predetermined position on the foundation plane, and a concrete indoor side wall (3a) integrally formed on the floor receiving member and provided with a heat insulating material is formed. Using the wall and the indoor side wall, including under the floor (6),
There has been an underfloor ventilation method in which independent heat-insulating spaces are formed except for passages, the floors made of wood or the like are provided for each of the heat-insulating spaces, and the floor depends on flowing air passing through the floors from inside the room.

[0005]

The under-floor ventilation method in the prior art basic ventilation opening construction method is to provide a ventilation opening having a plurality of sufficiently large cross sections in which a concave portion is formed at a predetermined position on a concrete foundation wall. Therefore, there is a problem that the main metal reinforcing bars for burying the cross section of the foundation wall horizontally need to bypass the ventilation opening, and the earthquake resistance is significantly impaired.

The underfloor ventilation method in the prior art basic packing construction method has good seismic resistance, but the outside air flows in from the adjacent packing gap on the foundation wall, and the adjacent packing on the floor receiving member under the indoor floor. Since the inflow outside air flows through the gap and ventilation is performed, the thickness of the packing is smaller than the width of the base wall and the floor receiving member, the flow resistance of the flowing air is large, and sufficient ventilation is performed. The humidity rises to 70% or higher, and the moisture content of the wood on the floor and the like also exceeds 20%. Therefore, the breeding of termites, the occurrence of large bark beetles, which are large pests of the awning material, the propagation of blue mold, the growth of wood rot fungi There has been a problem that the floor material is corroded and deteriorated due to breeding and the like, and the underfloor environment is deteriorated.

[0007] The underfloor ventilation method in the prior art basic insulated building system has good seismic resistance but depends on flowing air permeating through the floor from the room, so the flow resistance is large, sufficient ventilation is not performed, and the humidity is low. It becomes 70% or more, and the moisture content of the wood on the floor and the like also exceeds 20%. Therefore, it is caused by the breeding of termites, the occurrence of giant fly beetles, which are large pests of the round wood, the propagation of blue mold, the propagation of wood rot fungi, etc. There is a problem that the underfloor environment is deteriorated, causing corrosion and deterioration of the floor material and the like.

[0008]

In order to solve the above-mentioned problems, a method of ventilating under the floor in the foundation packing construction system according to the first aspect of the present invention, comprises the steps of:
At one location, a discharge port communicating from under the floor to the outside is provided, and a ventilation means having one discharge port and a plurality of suction ports is disposed under the floor, and the discharge port is connected to the discharge port through the discharge pipe from the discharge port. It is characterized in that discharge can be performed outdoors, a suction pipe is connected from the suction port at a predetermined location, and suction can be performed from a predetermined location under the indoor floor from the other end of the suction pipe.

According to a second aspect of the present invention, there is provided a method of ventilating under the floor in a heat insulating foundation system, wherein a discharge opening communicating with the outside is provided at at least one location on the concrete foundation wall or the wall, and the ventilation means is provided under the floor or the floor. The ventilating means is disposed in a room communicating with the underfloor, and the ventilating means has a discharge port and a suction port. The discharge port can discharge from the discharge port to the outside through a discharge pipe. A communication port is provided in at least the adjacent floor receiving member, and an indoor air introduction means is provided below the most upstream indoor floor, and communicates with each other through the communication port. It is characterized by a structure in which ventilation under the floor in all rooms is effectively performed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The underfloor ventilation method according to the first aspect of the present invention is a method of building a wooden floor of a building on a concrete foundation wall, also called a cloth foundation, via a plurality of packings having a cushioning property at predetermined intervals. Is fixed to the foundation wall, a foundation plane made of moisture-proof concrete is provided on the indoor side of the foundation wall, a wall is provided on the foundation to block the outdoors, and a floor is provided on the side. An underfloor ventilation method to be applied to a foundation packing building system for fixing, wherein at least one of the foundation walls communicates with the outside of the foundation wall from under the floor to a location where a horizontal main reinforcing bar can be avoided. A ventilation outlet is provided at a location separated from the outlet by a predetermined distance, the ventilation means having one discharge port and a plurality of suction ports in a main body container containing a fan, From the discharge port to the outside through the discharge pipe via the discharge pipe Possible out with and connects the suction pipe from the suction plug mouth of predetermined locations, characterized in that to enable the suction from the indoor floor in a predetermined position from the other end opening of the suction write pipe.

According to a second aspect of the present invention, there is provided a method of ventilating under a floor, wherein a concrete wall is integrally formed on a concrete base wall, and a base plane made of moisture-proof concrete or the like is provided on the indoor side of the base wall. And a concrete floor receiving member is erected at a predetermined position on the foundation plane, and integrated with the floor receiving member to form a concrete indoor side wall. An underfloor ventilation method applied to a basic insulated building system, wherein an independent insulated space is formed except for a passage by using an indoor side wall, and the floor made of wood or the like is arranged for each of the independent insulated spaces. At least one concrete wall
Outlets communicating with the outdoors, ventilation means are provided under the floor or in a room communicating with the floor, the ventilation means having a discharge port and a suction port in a main body container containing a fan; A discharge port can be discharged to the outside from the discharge port through the discharge port through the discharge pipe, and air under the floor can be sucked from the suction port. A communication port is provided at least in the adjacent floor receiving member, The communication port is arranged such that the lower part of the indoor floor where the ventilation means is installed is the most downstream side, and the indoor air introducing means is disposed under the most upstream indoor floor, and one end of a pipe constituting the indoor air introducing means. The indoor air inlet that is
The underfloor outlet, which is a branched other end of the pipe, is disposed at the most upstream side under the floor of the room, and is disposed so as to communicate with the floor of the room at a predetermined place such as under stairs. The air is discharged to the most upstream side under the floor of the room, and ventilation is effectively performed under the floor of the whole room which communicates with each other through the communication port.

The ventilating means used in the underfloor ventilation method of the present invention has one discharge port and a plurality of suction ports on a side surface of a main body container containing a fan, and a fan head of the fan is provided above the main body container. A suction port is provided below the fan inside the main body container, a discharge port on a side surface of the fan is connected to the discharge port, and a drain receiving member is provided below the main body container. A drain outlet is provided at at least one place of the drain receiving member, a drain to be stored can be discharged from the drain outlet through a pipe, and a plurality of support members are provided outside the side surface of the main body container. A column can be vertically attached to the support member with a fixing member such as a bolt and a nut, and the column can be extended and fixed vertically.

In the ventilation means used in the underfloor ventilation method of the present invention, the power supply of the fan is controlled from inside the room, a humidity detector is provided under the floor, and the humidity of the humidity detector exceeds a predetermined value. And a timer, the power of the fan can be controlled to be in an input state for a predetermined time.

In the underfloor ventilation method according to the second aspect of the present invention, a bathroom for installing a unit bath, which is usually used in a basic heat insulation building system, can be used as a room for installing a ventilation means. The ventilation means is installed in an empty space above the ceiling of the built-in storage box.
A plurality of support members are provided on the outside of the side surface of the main body container, and columns can be vertically attached to the support members by fixing members such as bolts and nuts. The columns are extended to the indoor ceiling, and ventilation means is suspended from the ceiling. The storage box can be fixed, and the storage box is installed on a base plane via a plurality of supports, and the air flowing in from below the floor in the adjacent room through the communication port rises between the bathroom side wall and the storage box. However, the air can be sucked into a plurality of inlets of the ventilation means and discharged to the outside from the outlet.

In the underfloor ventilation method according to the second aspect of the present invention, the underfloor in the basic heat insulation building system may be used as a place for installing the ventilation means. An outlet communicating with the outside is provided, and the air can be discharged from the outlet through the discharge port to the outside through a discharge pipe from the outlet of the ventilation means. Can be sucked into the suction port and discharged outside through the discharge port.

In the underfloor ventilation method of the present invention, the outlet and suction port of the ventilation means, the outlet of the discharge pipe, the inlet of the suction pipe, and the indoor air suction port and the underfloor discharge port of the indoor air introducing means are required. If necessary, it can be equipped with a defense grid or net to prevent the invasion of rats and the like.

By using the underfloor ventilation method of the present invention, the humidity under the floor is kept at 65% or less throughout the four seasons, and the moisture content of the wood on the floor and the like is reduced to 20% or less.
Protects termites from breeding, outbreaks of beetles, which are the major pests of awning, breeding of blue mold, and propagation of wood rot fungi.
It has the effect of preventing corrosion and deterioration of floor materials and the like, and maintaining the underfloor environment well.

In the underfloor ventilation method according to the first aspect of the present invention, fresh outside air is sucked under the floor from an adjacent packing gap provided on the entire periphery of the building, and is ventilated from the outlet through the discharge pipe by the ventilation means. Because it discharges to the floor, it has the effect of always maintaining a good ventilation state under the floor.

In the underfloor ventilation method according to a second aspect of the present invention, indoor air is introduced under the floor communicating with each other by using indoor air introducing means, and the ventilation means provided at the most downstream side is connected to the floor via a discharge pipe. Since it is discharged from the outlet to the outside, it has the effect of always maintaining a good ventilation state under the floor.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings of an embodiment of the present invention, FIG. 1 shows an embodiment 1 of the present invention, which is applied to a foundation packing building system, shows a use state of an underfloor ventilation method, and is a partially omitted side view.
FIG. 2 is a partially cutaway plan view of a ventilator used in the underfloor ventilation method, and FIG. 3 is a schematic explanatory view taken along an arrowhead just below the underfloor plane base showing a flow direction of ventilation in the underfloor ventilation method. FIG. 4 shows a second embodiment of the present invention, showing a use state of a below-floor ventilation method applied to a basic heat-insulating building system, a partially-mounted side view, and FIG. 5 shows a ventilation flow direction in the under-floor ventilation method. It is an underfloor plane cross section schematic explanatory view including a part right below the ceiling where the unit bus shown is installed.

Embodiment 1 of the present invention will be described below. The underfloor ventilation method according to the first embodiment is, as shown in FIG. 1, a underfloor ventilation method applied to a foundation packing building system, and includes at least a foundation wall (1). At one location, an outlet (1b) communicating with the outdoor (5) from below the floor (6) is provided at a location where the main metal bars that bury the inside of the foundation wall horizontally can be avoided, and a predetermined distance from the outlet. Ventilation means (10) is provided at a remote location, and the ventilation means has one discharge port (15) and a plurality of suction ports (1) in a main body container (12a) containing a fan (12).
6), the discharge port can be discharged from the discharge port to the outside through the discharge pipe (15a) through the discharge port, and the suction pipe (16a) is connected from the suction port at a predetermined location, and It is characterized in that it can be sucked from a predetermined location under the indoor floor from the other end.

The ventilation means (10) used in the underfloor ventilation method of the first embodiment includes a fan (1) as shown in FIGS.
The main body container (12a) containing 2) has one discharge port (15) and a plurality of suction ports (16) on the side surface, and the fan head (12a) of the fan protrudes above the main body container. A suction port is provided below the fan inside the main body container, and a discharge port on the side of the fan is connected to the discharge port, and a drain receiving member (13) is provided below the main body container. A drain outlet (13a) is provided in at least one place of the drain receiving member, and the drain to be stored can be discharged from the drain outlet through a pipe. A member (14) is provided, and the support member (14) is vertically attached to the support member with fixing members such as bolts and nuts.
a) can be attached, and the column can be extended on the basic plane (1a), and the ventilation means can be installed and used on the basic plane.

The power supply of the fan (12) of the ventilation means (10) used in the underfloor ventilation method of the first embodiment is controlled from the room, and a humidity detector is provided under the floor (6). When the humidity of the humidity detector exceeds a predetermined value, a timer can be used to control the fan to be in an input state for a predetermined time.

The ventilation means (10) used in the underfloor ventilation method of Example 1 uses a ventilation air volume of about 300 m ³ / hour, requires a power supply of 100 V: about 40 W, and has a discharge port (15) and a suction port ( The diameter of 16) is 100 mm, and the main container (1
The plane size of 2a) is a square of about 30 cm on one side, height:
About 20 cm was adopted, and by using the ventilation means, the humidity under the floor could be kept at 65% or less throughout the four seasons, and the water content of the corresponding wood could be kept at 20% or less.

The direction of ventilation flow using the underfloor ventilation method of Example 1 is shown by the thick black line arrow in FIG. 3, and is provided at least at one location on the foundation wall (1) from below the floor (6) to outside (5). ) Is provided, and a ventilator (10) is provided at a predetermined distance from the outlet, and one outlet (15) is provided in the main body container (12a) of the ventilator. )
And a plurality of suction ports (16), discharge from the discharge port to the outside through the discharge pipe (15a) through the discharge port, and connect the suction pipe (16a) from the suction port at a predetermined location. The suction pipe can be sucked from a predetermined location under the indoor floor from the other end of the suction pipe, and an arrangement is selected in which the other end of the suction pipe can suck air from the lower part of the indoor front floor as uniformly as possible.
Outside air from outside of the foundation wall is sucked under the floor through a gap between the adjacent packings (4), and a plurality of floor receiving members (1c) are sucked.
Through the gap between the adjacent packings above or the gap between the adjacent floor receiving members, the air under the floor flows into the other end of the suction pipe or the suction port of the ventilation means, and is discharged outside from the discharge port. It is characterized by being done.

As shown in FIG. 4, the underfloor ventilation method according to the second embodiment is a underfloor ventilation method applied to a basic heat insulation building system, and is made of concrete in which a heat insulating material is arranged integrally on a basic wall (1). An outlet (1b) communicating with the outdoor (5) is provided at at least one location on the wall (3), and a ventilation means (10) is provided under the floor (6) or in a room communicating with the floor. The means comprises a main body container (12a) containing a fan (12).
A discharge port (15) and a suction port (16), from which the discharge port can be discharged to the outside through a discharge pipe (15a), and the underfloor air can be sucked from the suction port. A communication port (1d) is provided at least in the floor receiving member (1c) that blocks the floor under each adjacent room, and the communication port is located at the most downstream position in the indoor floor where the ventilation means is installed. It is characterized by being on the side.

In the underfloor ventilation method according to the second embodiment, as shown in FIG. 4, as a room for installing the ventilation means (10), a unit bath (2
0), the ventilation means is installed in an empty space above the ceiling of a storage box (21) containing a bathtub (22), and the ventilation means (10) is shown in FIG. like,
A main body container (12a) containing a fan (12) has one discharge port (15) and a plurality of suction ports (16) on a side surface thereof.
A fan head (12a) of the fan protrudes and is fixed to the upper part of the main body container, a suction port is provided below the fan inside the main body container, and a discharge port on a side surface of the fan is connected to the discharge port. A drain receiving member (13) is formed below the main body container, and a drain outlet (13a) is provided at at least one position of the drain receiving member. A plurality of supporting members (14) are provided outside the side surface of the main body container, and a column (14a) can be vertically attached to the supporting member with fixing members such as bolts and nuts. It can be extended to the indoor ceiling (7), and the ventilation means can be suspended and fixed to the ceiling, and the storage box is installed on the base plane (1a) via a plurality of supports (24), and Floor (6)
The air flowing through the communication port (1d) from below rises between the bathroom side wall and the storage box, is sucked into the plurality of suction ports of the ventilation means, and is discharged outside through the discharge port (1b). It is characterized by things.

The direction of ventilation flow using the underfloor ventilation method of Example 2 is indicated by the thick black line arrow in FIG. 5 and is at least one portion of the concrete wall (3) integrated on the foundation wall (1). A vent (1b) communicating with the outdoor (5) is provided, and a ventilation means (10) is arranged under the floor (6) or in a room communicating with the floor. The ventilation means is provided with a fan (12). The main body container (12a) has a discharge port (15) and a suction port (16). The discharge port can be discharged from the discharge port to the outside through a discharge pipe (15a). The underfloor air can be sucked in, and a communication port (1d) is provided at least in a floor receiving member (1c) that blocks the underfloor of each adjacent room, and the communication port is provided with the ventilation means. The indoor floor under the indoor floor is the most downstream, and the indoor air Means (30), and the indoor air inlet (31a), which is one end of the pipe (31) constituting the indoor air introducing means, is placed on the indoor floor at a predetermined place that is not noticeable, such as inside the push-in area or under the stairs. And an underfloor discharge port (31b), which is the other end of the pipe, is disposed at the most upstream position under the indoor floor, so that room air is discharged to the most upstream position under the indoor floor. And a structure in which ventilation is effectively performed under the floor of all the rooms that communicate with each other through the communication port.

[0029]

The present invention is embodied in the form described above and has the following effects.

By using the underfloor ventilation method of the present invention, the underfloor humidity can be reduced by 65% throughout the four seasons in the base packing building system and the base insulation building system having earthquake resistance.
The water content of wood on the floor and the like is also reduced to 20% or less. Therefore, the breeding of termites, the occurrence of bark beetles, which is a major pest of round wood, the propagation of blue mold, the propagation of wood rot fungi, etc. are prevented. It has the effect of preventing corrosion and deterioration of floor materials, etc., and maintaining the underfloor environment well.

In the underfloor ventilation method applied to the basic packing building system of the present invention, fresh outside air is sucked under the floor from a gap between adjacent packings provided on the entire periphery of the building, and is discharged from the discharge port through the discharge pipe by the ventilation means. Since it is discharged to the outside, it has the effect of always maintaining good ventilation under the floor.

In the underfloor ventilation method applied to the basic heat insulation building system of the present invention, indoor air is introduced under the floor communicating with each other by using indoor air introduction means, and the discharge pipe is discharged by the ventilation means installed at the most downstream side. As a result, the air is discharged from the outlet to the outside, so that there is an effect that the underfloor is always maintained in a good ventilation state.

[Brief description of the drawings]

FIG. 1 is a partially cut-away side view showing a use state of an underfloor ventilation method applied to a foundation packing building system, showing a first embodiment of the present invention.

FIG. 2 is a partially cut-away plan view of a ventilator used in an underfloor ventilation method, which is applied to a foundation packing building system, showing Embodiment 1 of the present invention.

FIG. 3 is a schematic cross-sectional view of a section directly below the under-floor plane base showing the direction of ventilation flow in the under-floor ventilation method applied to the foundation packing building system, showing the first embodiment of the present invention.

FIG. 4 is a partially cut-away side view showing a use state of an underfloor ventilation method applied to a basic heat insulation building system, showing a second embodiment of the present invention.

FIG. 5 is a schematic plan sectional view of the underfloor section including a part directly below the ceiling and showing the direction of ventilation flow in the underfloor ventilation method applied to the basic heat insulation building system, showing the second embodiment of the present invention.

FIG. 6 is a perspective view showing a partly omitted underfloor ventilation method applied to a basic ventilation opening construction method, showing a first embodiment of the prior art.

FIG. 7 is a perspective view showing a second embodiment of the prior art, in which a part of the underfloor ventilation method applied to a foundation packing building system is partially omitted.

FIG. 8 is a perspective view showing a third embodiment of the prior art, in which a part of a below-floor ventilation method applied to a basic heat insulation building system is not shown.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Basic wall 1a Basic plane 1b Discharge port 1c Floor receiving member 1d Communication port 2 Base 3 Wall 3a Indoor side wall 4 Packing 5 Outdoor 6 Floor 7 Ceiling 10 Ventilation means 11 Main body container 12 Fan 12a Fan head 13 Drain receiving member 13a Drain discharge Outlet 14 Support member 14a Prop 15 Discharge port 15a Discharge pipe 16 Suction port 16a Suction pipe 20 Unit / bus 20a Connecting member 21 Storage box 22 Bathtub 23 Bathroom door 24 Support stand 25 Bathroom ventilation fan 30 Indoor air introduction means 31 Pipe 31a Indoor air Suction port 31b Underfloor outlet 40 Ventilation port 40a Grid

Claims (2)

[Claims] 1. A foundation (2) made of a wooden material or the like of a building is placed on a concrete foundation wall (1), also called a cloth foundation, via a plurality of packings (4) having a cushioning property at predetermined intervals. A foundation plane (1a) made of moisture-proof concrete or the like is provided on the indoor side of the foundation wall, a wall (3) for blocking the outdoors is erected on the base, and a floor (6) is provided on the side. ) Is a method for underfloor ventilation applied to a foundation packing construction method, wherein the underfloor is installed in at least one place of the foundation wall so as to avoid a main metal bar buried horizontally inside the foundation wall. An outlet (1b) communicating with (5) is provided, and a ventilator (10) is provided at a location away from the outlet by a predetermined distance, and the ventilator includes a main body container (10) having a built-in fan (12). 12a) has one discharge port (15) and a plurality of suction ports (16). A discharge pipe (15a) can be discharged from the outlet through the discharge port to the outside, a suction pipe (16a) is connected from the suction port at a predetermined location, and a predetermined level below the indoor floor from the other end of the suction pipe. An underfloor ventilation method characterized by being able to suck in from a location. 2. A concrete wall (3) is formed integrally with a concrete foundation wall (1), and a foundation plane (1a) made of moisture-proof concrete is provided on the indoor side of the foundation wall. A concrete floor receiving member (1c) is erected at a predetermined position on the foundation plane, and integrated with the floor receiving member to form a concrete indoor side wall (3a), and each room has a floor (6).
Using the wall and the indoor side wall, including the bottom, to form an independent heat-insulating space except for indoor doors and passages, and laying the floor for each independent heat-insulating space. An underfloor ventilation method, wherein at least one of said concrete walls is
Outlets (1b) communicating with the outdoors (5)
A ventilation means (10) is provided under the floor or in a room communicating with the underfloor, and the ventilation means has a discharge port (15) and a suction port (16) in a main body container (12a) containing a fan (12). A discharge pipe through a discharge pipe (15a) from the discharge port so that air can be discharged from the discharge port to the outside, and air under the floor can be sucked from the suction port. The mouth (1d) is arranged, and the arrangement of the communication port is as follows.
The floor under the indoor floor where the ventilation means is installed is the most downstream side, and the indoor air introduction means (30) is disposed under the indoor floor at the most upstream side, and one end of a pipe (31) constituting the indoor air introduction means. A certain indoor air intake port (31a) is provided so as to communicate with the indoor floor at a predetermined place that is inconspicuous, such as inside the press-in area or under a staircase, and a below-floor discharge port (31b), which is the branched other end of the pipe. At the most upstream position under the floor of the room, the indoor air is discharged to the most upstream position under the floor of the room, and ventilation under the floor of all rooms communicating with each other through the communication port is performed effectively. Underfloor ventilation method characterized by the following.