JP2010071950A - Method for verifying airtightness of framework under construction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for measuring airtightness of a building under construction, capable of confirming airtightness of a framework after completion of airtightness construction with high simplification and desired precision. <P>SOLUTION: The method for verifying airtightness of a building under construction, capable of verifying airtightness of a framework by generating a pressure difference at an inside and an outside of the building under construction completed up to airtightness construction in which an airtightness layer is formed in a framework after completion of framework construction in which framework is formed by erecting an upper structure on a foundation structure and installing construction materials such as outer walls and roofs on the upper structure to form the framework, includes an airtightness verification process (S3) for generating a differential pressure inside and outside the framework by operating forced exhaust equipment installed on the framework with airtightness construction completed, thus verifying an airtightness state of the framework. As the forced exhaust equipment, there can be utilized a forced exhaust system installed to improve discharge of oil-contaminated water of the construction materials by introducing outside air into an internal space of the framework. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for verifying airtightness in the course of constructing a housing such as a highly airtight housing.

In recent years, highly airtight enclosures are often built for the purpose of increasing the air conditioning efficiency of houses.
In the construction of this type of highly airtight enclosure, after the outer wall and roof are installed on the upper structure consisting of frames such as beams and columns, the enclosure is formed, and then the airtight construction is performed to form an airtight layer on the enclosure. It is common practice to install facilities that provide piping and wiring by providing through holes and the like in the housing and hermetic layer. Further, the airtight construction and the equipment construction are usually performed by different contractors. Then, when it is found that there is a problem with the airtightness of the building after completing the equipment construction and reaching the final stage of construction or after the building is completed, it is based on the construction of the airtight construction contractor who performed the airtight construction. It is extremely difficult to determine whether it is based on the construction of a facility contractor who has an opening in the airtight layer formed by the airtight construction, and there is a risk that there will be a useless dispute between the two. For this reason, presentation of the method of measuring airtightness easily also in the frame in construction is desired.

On the other hand, for example, Patent Document 1 discloses a method of measuring the airtightness of a housing from a pressure difference generated inside and outside the housing, and uses an air supply / exhaust equipment provided in advance in the housing. Alternatively, a method for measuring the airtightness of the housing is disclosed in which a pressure difference is generated inside and outside the housing by exhausting to measure the airtightness of the housing.
However, Patent Document 1 discloses a method for measuring the airtightness after the above-described facility construction is completed, and does not disclose or suggest the airtightness verification of the in-process housing before the facility construction.
JP 2001-91397 A

  This invention is made | formed in view of the said situation, and it is providing the airtight measuring method of the building in the middle of construction which can confirm the airtightness of the housing after completion of airtight construction simply and with desired precision.

As a specific means for solving the above problems, the present invention provides:
(1) After building the upper structure on the foundation structure and installing the outer wall and building materials such as a roof on the upper structure to form the housing, until the airtight construction to form an airtight layer on the housing Is a method for verifying the airtightness of a building under construction, in which a pressure difference is generated inside and outside the building under construction to verify the airtightness of the frame,
By operating a forced exhaust facility provided on the housing after the airtight construction is completed and exhausting the housing, a differential pressure is generated inside and outside the housing, and the airtight state of the housing is confirmed based on the differential pressure. It is characterized by having an airtight confirmation process.
According to such a configuration, when the hermetic construction is completed, the hermeticity of the chassis can be verified by using the forced exhaust equipment provided in the chassis, and the current hermetic state of the chassis can be checked very easily. can do. Here, the forced exhaust facility may be an air supply / exhaust facility that is used as it is after the completion of the building, or may be separately installed so that the forced exhaust device can be temporarily removed. However, when using air supply / exhaust equipment such as an air supply / exhaust fan, kitchen range fan, ventilation fan, ceiling fan, etc. that remain installed in a building such as a house, of course, such equipment is necessary when performing airtightness verification. Must already be provided, and such equipment may not be available at the stage of completion of hermetic construction where construction of equipment has not been performed. In addition, since a relatively high output exhaust system is required to verify the airtightness of the entire building, if the installed equipment does not meet the high output conditions, obtain a sufficient pressure difference for airtightness measurement. In some cases, a high-precision differential pressure gauge becomes necessary, and it takes a lot of time and effort to measure.
On the other hand, when installing forced exhaust equipment temporarily, it is natural that a forced exhaust installation with sufficient output necessary for airtightness verification must be installed. Need to be done.
Therefore, comparing the two, forced exhaust equipment may use the air supply and exhaust equipment that is used as it is after the building is completed, but it is preferable to temporarily install and use the forced exhaust equipment so that it can be removed There are many.

In addition, a frame has shown the thing containing the upper structure constructed | assembled above a foundation structure (concrete foundation and foundation), and the outer wall supported by the said upper structure. The frame is not particularly limited, such as a frame covered with a roof / floor slab or an outer wall, or a wall-type frame with a frame of a frame composed of column beams.
Roofs, floor slabs, and outer walls that form the interior space of the frame are building materials that have standardized dimensions based on the module dimensions that serve as building design standards, such as concrete panels and siding panels. When the housing is completed (in the building construction stage), a certain internal space is formed in which rainwater or the like does not flow from the outside, but outside air can be introduced through windows or gaps between building materials.
Therefore, the housing is not a structure that is not open to the outside so that ventilation is not necessary, and the internal space is not a structure that is sealed from the outside. Equivalent area), and is a structure that ensures the number of ventilations equivalent to the ventilation required to release the moisture contained in the building materials that form the enclosure, and the flow of ventilation air (circulates the air in the internal space by a forced ventilation fan) The water is transported by replacing the internal air with the outside air.
The foundation structure is a lower structure consisting of a foundation and foundation that transmits the upper load of the building including the frame to the ground, but the ventilation opening for the ventilation of the internal space is a key part of the rising part of the outer foundation Are appropriately formed.
In addition, building materials essentially include building materials that absorb moisture when exposed to building materials containing moisture, such as mortar, and are exposed to rainwater. Specific examples include concrete panels such as (ALC), siding panels, and the like.
In addition, for example, in a building with a frame structure, a frame or pillar is assembled on the upper part of the foundation or foundation, roof panels and floor panels are laid, and the installation of exterior wall panels is completed. Refers to the state. Similarly, in a building with a wall structure, a roof and a floor are laid on the upper part of the foundation and foundation, and the arrangement of the outer wall panel is completed.

(2) Moreover, it is preferable that the said forced exhaust equipment is a forced exhaust apparatus installed in order to introduce | transduce outside air into the internal space of a housing and to accelerate | stimulate discharge | release of the moisture content of the said building material.
The inventors of the present application have made extensive studies on a temporarily installed forced exhaust device with sufficient output for airtightness measurement.When measuring the airtightness of the housing after the airtight construction, the outside air is discharged into the internal space of the housing. It has been found that it is preferable to use a forced exhaust device that is introduced to promote the release of moisture contained in the building material. The forced exhaust device exhausts the dry air, which is outside air, to the internal space of the housing and circulates the dry air in the housing, and then exhausts the dry air from the gap or opening of the housing by the forced exhaust device. The dry air introduced into the interior space is exhausted to the outside of the housing through a forced exhaust device after absorbing moisture of the building material and the like forming the housing to become wet air. In order to form such a forced air flow inside and outside the enclosure, the ventilation amount of the forced exhaust system is mainly the various ventilation provided for mechanical ventilation required in daily life of the building after construction. It is significantly larger than the equipment. By using the forced exhaust device, it is possible to generate a large differential pressure of about 10 Pa inside and outside the housing (airtight layer) when the forced exhaust device is activated even after an airtight layer is formed on the housing. The present inventor has also confirmed that As a result, the differential pressure can be easily measured, and it is possible to determine the airtightness of the housing immediately after the airtight construction for forming an airtight layer on the housing.

  In addition, the forced exhaust device has been installed in the housing to remove moisture from the building materials forming the housing before the airtight construction, and is installed for the purpose of measuring airtightness. Then, in the construction process of the building, you can also check the airtightness of the enclosure using the ventilation device provided for another purpose of removing the moisture of the building material that forms the enclosure, The device installation process for airtightness confirmation can be significantly reduced or omitted, and airtightness confirmation can be performed while avoiding delays in construction.

(3) In addition, after the airtight construction, equipped with equipment construction to perform construction with the formation of through holes such as air holes penetrating the outer wall and the airtight layer of the housing,
The airtightness confirmation process includes
At the time of completing up to the airtight construction, by performing forced exhaustion by the forced air supply and exhaust device, an initial airtight confirmation step for confirming airtightness by generating a differential pressure inside and outside the housing,
After completing the facility construction, by performing forced exhaust by the forced air supply / exhaust device, an airtight confirmation step after facility construction for confirming airtightness by generating a differential pressure inside and outside the housing,
It is preferable to provide.
According to this, it becomes possible to confirm how much the airtightness of the housing has been reduced due to the airtight defect that may occur due to the facility construction.

(4) In addition, the facility construction is performed multiple times,
Every time each facility construction is completed, an after-construction airtightness confirmation process is performed to confirm the airtightness of the enclosure after the facility construction based on the internal / external differential pressure generated by forced exhaust by the forced exhaust device,
It is preferable.
According to this, it can be judged how much the airtightness of the housing has decreased for each facility construction process.

(5) Also, as a forced exhaust device capable of the above measurement,
A support member mounted on a frame material that forms an opening edge of the opening formed in the housing;
A ventilation fan body attached to the support member, for sucking air in the internal space of the housing and exhausting it outside the housing;
A protective member disposed on the windward side of the ventilation fan body to protect the ventilation fan body;
It is preferable to provide a wind direction changing member that is disposed leeward of the ventilation fan body and changes the exhaust flow.

(6) In addition, the position of the forced exhaust device is determined so that the outside air introduced into the internal space of the housing by the operation of the forced exhaust device circulates in the internal space of the housing and is discharged to the outside again. The opening in which the forced exhaust device is installed may communicate with the internal space of the frame constructed on the foundation structure formed by the frame construction to the internal space of the foundation structure. It is particularly preferred.
According to this, the underfloor space surrounded by the housing and the foundation structure can be brought into a pressurized state by the exhaust from the forced exhaust device. For this reason, the differential pressure between the internal space of the enclosure and the internal space of the foundation structure is larger than the differential pressure between the internal space of the enclosure and the outdoor space by the amount of pressure, and thereby the internal space of the enclosure and the basic structure When there is an air leakage path that communicates with the internal space, it is possible to overestimate the leakage from the internal space of the foundation structure to the internal space of the enclosure through the air leakage path, The presence of the leak path can be strictly evaluated. That is, when the internal / external differential pressure is extremely small, the existence of such an air leakage path can be suspected first. Ventilation due to temperature differences in winter and the like is likely to increase due to the air leakage path that exists below the chassis, so reducing the presence of the air leakage path as much as possible is effective in improving the airtight performance of the chassis. As described above, exhausting toward the internal space of the foundation structure has an advantageous effect on the discovery of the leakage path.

  According to the method for measuring the airtightness of a building under construction according to the present invention, the airtightness performance immediately after the completion of the airtight construction can be easily measured with desired accuracy.

In the present invention, as shown in FIG. 1, after completing the frame construction (step S1) for constructing the frame on the foundation structure, the airtight construction (step S2) for forming an airtight layer on the frame is performed, and then Airtightness confirmation work (initial airtightness confirmation process (step S3)) to confirm the airtightness of the building under construction is performed, and after the equipment construction (step S4) is performed, further airtightness confirmation work (airtightness after equipment construction) A confirmation step (step S5)) is performed.
In each of the airtightness confirmation operations (steps S3 and S4), the forced exhaust device that is left in the housing is operated after the construction of the housing is completed in order to release moisture contained in the building material used in the housing. The pressure difference (hereinafter also referred to as the internal / external differential pressure or simply the differential pressure) is generated between the housing and the external space, and the pressure difference of the building under construction is measured by measuring the pressure difference. Check.

The frame construction (step S1) includes a foundation construction process (step S1-1) for forming the foundation structure 1 of the building as shown in FIG. 2, and a frame construction process (step S1) for building the building frame 2 on the foundation structure 1. S1-2) and a moisture removing step (step S1-3) for removing moisture from the casing 2.
The foundation construction process (step S1-1) is a process of starting up the foundation on the ground. In this embodiment, a reinforced concrete continuous cloth foundation is adopted as the foundation structure 1 that supports the frame 2. As shown in FIG. 3B to be described later, a plurality of ventilation openings 3a are provided at appropriate intervals along the longitudinal direction at the rising portion that forms the outer peripheral portion of the foundation structure 1. A plurality of ventilation openings 3b communicating with each other between the foundation grids are also provided at appropriate intervals along the longitudinal direction at the rising portion of the foundation structure on the inner periphery, and the interior of the foundation structure is provided through these ventilation openings 3a and 3b. Natural ventilation of the space is made. The vents 3a and 3b have a finding area (provided on the basic rising surface) of about 300 cm ² at intervals of about 4 m, for example, and can provide a sufficient opening area for exhaust by the forced exhaust device.

The frame building step (step S1-2) is a step of building the frame 2 on the foundation structure, and in this embodiment, the frame is a normal one-story, two-story building constructed on the foundation structure, The wall 5, floor 6 and roof 7 are constructed of building materials such as concrete panels that are factory-molded into a three-storied beam 4 and pillar frame structure. When the frame 2 is erected, the wall 5 The floor 6 and the roof 7 are assembled to form a certain internal space, and the roof portion is waterproofed so that rainwater does not flow in, while the window sash and the gap between the building materials are sealed (seal ) Or is externally sealed but still incomplete, and there are certain openings, gaps, etc. in the wall 5 etc., allowing a certain amount of air in and out of the housing. It is in a state that can be. In other words, the frame that has completed the frame construction is a structure that has various members and gaps between the members, and the number of ventilations corresponding to the necessary ventilation amount to be described later is secured.
In addition, by raising the housing 2 to the foundation structure, an underfloor space S surrounded by the foundation structure and the first floor slab 6a is formed below the first floor slab 6a of the housing 2.

By the way, in the case 2 that has been completed up to the case construction, moisture remains in the interior of building materials such as concrete panels and siding panels used for outer walls and floor slabs even after completion of molding at the factory. However, since these building materials also have water absorption properties, when they come into contact with a material containing water such as mortar in the construction on site, the water is absorbed and becomes in a state containing water. Alternatively, there are cases in which water is absorbed by exposure to rainfall after the building materials are carried on site.
If the building is completed with the building materials that contain excessive moisture for the above reasons in an excessively humid state, condensation will occur inside the building due to the moisture, In addition to causing a high humidity feeling to the person, it may also adversely affect the durability of the building material and thus the durability of the entire building.

Therefore, in the present embodiment, a water removal step (step S1-3) is provided for the purpose of removing as much as possible the water remaining in the building material after the completion of the above-mentioned frame construction step (step S1-2). ing.
In the water removal step (step S1-3), a forced ventilation flow is formed in the housing, and the building material is dried from the inside by the ventilation flow. The forced ventilation flow can be generated in the housing by attaching a forced exhaust device to the housing and starting the forced exhaust device.
The forced exhaust device may be installed anywhere as long as the outside air can be introduced into the internal space of the housing. For example, the forced exhaust device can be installed in an opening such as a window. However, for example, if the forced exhaust device is installed at the opening of a window, several problems may occur. In other words, if a forced exhaust system is installed in the window, rainwater can be blown in the rain, there are many obstacles in the construction around the opening, there are security problems, the sash may be damaged, exhaust There are problems such as noise and noise that may annoy neighbors.

Therefore, in the method according to the preferred embodiment of the present invention, in order to avoid these problems, as shown in FIG. 3B, a forced exhaust device 9 is installed on the first floor slab 6a, and the foundation structure The air is exhausted outside through an internal space (hereinafter also referred to as an underfloor space S).
In order to discharge air through the internal space of the foundation structure, the forced exhaust device 9 is installed in the opening 8 of the housing 2 that communicates with the internal space of the foundation structure. The opening 8 exists as an underfloor inspection port even after the building is completed.

  Examine the ventilation volume required when the moisture content of building materials is released by the forced exhaust system. FIG. 3A shows a state in which a two-story house frame 2 is constructed on the foundation structure, and the operation of the forced exhaust device 9 installed in the opening (underfloor inspection port) 8 on the first floor. As a result, outside air is introduced into the first and second floor rooms from the openings and gaps of the housing, and the water-absorbing building materials constituting the wall 5, floor 6, ceiling, and roof 7 of the housing 2 are dried and introduced to the first floor. The outside air is passed through the forced exhaust device 9 installed in the lower floor inspection port 8 on the first floor, and the outside air introduced on the second floor is blown through the forced exhaust device 9 installed in the lower floor inspection port 8 on the first floor. The air is sucked and guided to the underfloor space S, and is exhausted to the outside again through the ventilation holes 3a and 3b of the foundation structure. In the case of a generally designed house, the volume of the internal space of the foundation structure 1 that is the underfloor space S on the first floor is about 1/10 or more of the volume of the internal space of the housing 2, and the ventilation frequency Corresponds to about 10 times or more the internal space of the housing 2.

As an example, a ventilation amount for removing 2 t of moisture weight contained in the building material constituting the housing 2 by forced ventilation is calculated as follows.
First, it is assumed that the outside air flowing into the internal space of the housing 2 has, for example, a monthly average temperature of April in Tokyo of 15.1 ° C. and a relative humidity of 61% RH. And the relative humidity of the internal space of the housing 2 at this time is set to 100% RH, and the relative humidity when the inflowing outside air is forced to circulate through the internal space of the housing and then sucked into the internal space of the foundation structure 1 under the floor, Assume 80.5% RH, which is the median relative humidity value between the inflowing outside air (61% RH) and the internal space (100% RH) of the enclosure. Here, it is assumed that the temperature does not change for simple calculation.
In this case, since the outside air before flowing into the building is in a state where the temperature is 15.1 ° C. and the relative humidity is 61% RH, it has moisture of 7.869 g / m ^3. The new low-humidity air that has entered the space comes into contact with the building material containing excess moisture, so that the equilibrium state is lost and moisture moves from the building material to room air. When the air is sucked into the internal space of the foundation structure 1 under the floor, the air temperature is 15.1 ° C., the relative humidity is 80.5% RH, and it contains 10.385 g / m ³ of water. It becomes a state. Therefore, in calculation, the inflowing outside air convects the internal space of the housing, returns to the outside through the internal space of the foundation structure, and 10.385 g / m ³ −7.869 g / m ³ = 2.51 g / m. ³ moisture can be moved.
Here, when the construction period during which forced exhaust can be carried out is 40 days, in order to discharge 2t of moisture from the building material constituting the internal space of the housing,
A ventilation volume of 2,000,000 g / (40 days × 24 hours) / (2.5 g / m ³ ) = 833 m ³ / hour is required.
Therefore, it is considered sufficient to use a ventilation facility having a ventilation capacity of 1000 m ³ / hour.
By the way, when calculating the monthly moisture weight in Tokyo when using a ventilation facility with a ventilation capacity of 1000 m ³ / hour, the construction period in which forced exhaust can be carried out is 40 days, and in January, a moisture weight of 1.8 t, 4 It is expected that a moisture content of 2.4 t will be emitted in the month, a moisture mass of 2.4 t in July, and a moisture content of 3.0 t in October.
Actually, at the initial stage of installation of the forced exhaust device, the amount of discharge is large because the inside of the case is high humidity, and the relative humidity inside the case is lowered and the amount of water discharged is reduced as drying progresses. Further, since the operation time of the forced exhaust system may be reduced due to the work at the site, it is necessary to allow for this point.

The ventilation volume of 1000 m ³ / hour explained above corresponds to 3.3 ventilation / hour as the ventilation frequency of a house with a total floor area of 40 tsubo (the floor may be 2nd floor or 3rd floor). In order to release the moisture content of the building materials to be configured, a large amount of ventilation is required as compared with the case of normal ventilation. The ventilation frequency is a level that is too large compared with ventilation in an actual living environment.
By the way, in general, it is obliged to install ventilation equipment 0.5 times / hour from the viewpoint of indoor air quality due to the revision of the Building Standards Act in 2003, but in the living environment, especially in winter, When the amount of ventilation is large, comfort may be impaired due to the feeling of airflow. For this reason, the case of exceeding 1.0 times / hour is regarded as overventilation. Note that the ventilation rate when ventilation is performed by opening a window is approximately 30 times / hour or more.

As described above, a forced exhaust device 9 having a large air volume is used, and preferably a device capable of achieving a ventilation rate of 2 to 10 times / hour is selected. In particular, even if the internal / external differential pressure is large, the exhaust amount decreases. Difficult pressured ventilation fan is used.
In addition, although the ventilation period and the amount of ventilation of the forced exhaust system 9 vary appropriately depending on the moisture contained in the building material, the season in which the construction is performed, the climate and weather, and the size of the building, the ventilation period is at least 3 to 4 weeks. It is preferable to use a forced exhaust device 9 having a ventilation amount of 1000 m ³ / hour or more.

Next, the installation structure of the forced exhaust device 9 according to the present invention will be described.
As shown in FIG. 3 (b), the continuous fabric foundation as the foundation structure 1 is formed by integrating the rising portion of the outer peripheral portion and the rising portion of the inner peripheral portion, and a plurality of ventilation ports 3a are formed on the outer peripheral portion. A plurality of ventilation openings 3b are provided at appropriate intervals along the longitudinal direction, and are provided at appropriate intervals along the longitudinal direction. It has a structure that allows for ventilation. The ventilation openings 3a and 3b are arranged, for example, at intervals of about 4 m, for example, and have an area of about 300 cm ² , for example, and an opening area sufficient for exhausting by the forced exhaust device 9 can be obtained. The housing 2 is constructed on the foundation structure 1, 6aa is the surface of the floor panel, 6b is the second floor slab, 10 is the atrium that connects the first floor and the second floor, 11 is installed with windows and the like. It is an opening.

The first floor slab 6a of the housing 2 is provided with an underfloor inspection port 8 as an opening, and a forced exhaust device 9 composed of a pressure type ventilation fan is connected to the underfloor inspection port 8 on the intake side on the first floor. On the side, the exhaust side is detachably installed toward the internal space of the foundation structure 3.
Then, by operating the forced exhaust device 9, outside air is introduced into the room through the opening 11 of the housing 2 or a gap between members (not shown) and the like, and is sucked by the forced exhaust device 9, and the internal space of the foundation structure 1. The air is exhausted from the ventilation openings 3a and 3b to the outside to be ventilated, and the building material constituting the housing 2 is dried by forced air circulation between them, and the moisture contained in the foundation structure 1 is also released. It has become so.

As shown in FIGS. 3B to 5, the forced exhaust device 9 is housed in a box-like support member 12 and dropped together with the support member 12 from the underfloor inspection port 8 to the underfloor inspection port. No. 8 is stored below the floor of the first floor and does not protrude. Further, the upper part of the forced exhaust device 9 is protected by a grid-like protective member 13 placed by using the peripheral edge of the underfloor inspection port 8. That is, the protection member 13 is fitted on the flange-like edge portion 12b of the support member 12 along the periphery of the underfloor inspection port 8, and its installation height is substantially the same level as the first floor surface.
As shown in FIG. 4, the underfloor inspection port 8 is a rectangular through-hole formed in the first-floor floor slab 6a, and the through-hole is L-shaped in cross-section in one floor panel region where the through-hole is to be provided. It is formed by laying a steel frame member 14 for floor laying composed of the above members and partially laying a floor panel.
A floor opening frame member 15 is fixedly attached to the inner peripheral edge of the through hole along the steel frame member 14. That is, the floor opening frame member 15 is attached to a steel frame member 14 in contact with a rising piece having an L-shape in sectional view and in contact with a horizontal piece on the first floor slab 6a side.

Further, on the substantially horizontal upper surface of the frame member 14, an outer frame member 16 having substantially the same outer peripheral dimensions as the frame member 14 but smaller in width than the frame member 14 is fixedly attached. A receiving seat 17 is formed on the inner portion of the outer frame member 16. This structure is a floor opening structure of an underfloor inspection port 8 constructed in a normal industrialized house, and is a floor slab in which a plurality of standardized concrete panels are provided on the foundation, foundation or beam.
The forced exhaust device 9 includes a frame 18 and a ventilation fan body including a drive unit 19 and a blade member 20, and is placed on a bottom 12 a in which a rectangular opening of the support member 12 is formed.
The frame 18 is provided with a plurality of Tasuki-shaped arm portions 18b on a rectangular frame frame 18a in which a seating portion spreads outward in a flange shape, and the drive portion 19 has a drive shaft 19a on the substantially central side of the frame frame 18a. The blade member 20 is attached to the drive shaft 19a and is disposed at a position surrounded by the frame frame 18a, and is attached to the support member 12 together with the support member 12. It is mounted on the seat 17.

  In the present invention, the support member 12 with respect to the underfloor inspection port 8 and the forced exhaust device 9 with respect to the support member 12 are configured to be easily attached and detached, so at any time during construction of the building, Regardless of the process and job type, anyone can install or remove the forced exhaust device 9. The forced exhaust device 9 is a ventilation fan device that is temporarily installed during the construction work of the building, and the attachment / detachment work of the ventilation device 9 is a one-side operation performed from the upper side of the floor slab surface 6aa. Eliminates fixing with bolts that must be operated from both sides. In this case, there is a problem that vibration occurs during operation of the ventilator. In order to suppress this, the clearance between the steel frame member 14 for laying the floor and the support member 12 is set to about 3 to 5 mm, and the support member 12 is fitted into a receiving seat 17 frame on the inner portion of the outer frame member 16 so as not to be laterally displaced.

As shown in FIG. 5, the support member 12 is a rectangular box-like frame body in which a rectangular opening is formed and the bottom 12a is formed in a strip shape, and the forced exhaust device 9 has a frame frame 18a on the bottom 12a. The flange portion is seated and fastened by fastening means 21 such as bolts and nuts and attached to the support member 12.
Further, the upper edge portion of the support member 12 is bent outward and formed into a flange shape, the flange-like edge portion 12b is seated on the receiving seat 17, and the support member 12 is forced to the forced exhaust device 9 together. It is placed on the frame member 15. Further, the length (depth) of the support member 12 in the lower floor direction is such a depth that the drive unit 19 which is the top of the forced exhaust device 9 is positioned at a position lower than the height of the upper surface of the frame member 15. Is secured.

As shown in FIG. 6, a rectangular protective member 13 in which a plurality of rod-like lattices 13 b are provided on a rectangular peripheral member 13 a is provided on the support member 12, and the peripheral member 13 a is replaced with the frame member 15. The support member 12 is placed on the flange-like edge portion 12b of the support member 12 that is seated on the receiving seat 17, and the upper surface of the protection member 13 is substantially the same height as the upper surface of the outer frame member 16. . This protective member 13 is preferably installed so that the level difference from the floor surface is 0 to 30 mm.
The forced exhaust device 9 is a pressure type in which the housing side that hits the upper side in the installed state is the intake side and the inner space side of the foundation structure 1 that hits the lower side is the exhaust side, and the exhaust is made downward in the axial direction. The Therefore, the forced exhaust device 9 is provided with wind direction changing means. That is, on the support member 12 to which the forced exhaust device 9 is attached, baffle plates 22 constituting wind direction changing means are arranged at regular intervals downward from the blade member 16 of the forced exhaust device 9, and a plurality of bolts -It is fixed by connecting means 23 made of nuts or the like, and the flow of the air exhausted downward in the axial direction hits the baffle plate 22 and changes the air direction in the horizontal direction and flows.

The forced exhaust device 9 as described above can be easily installed by being housed in a box-shaped support member 12 and dropping into the first floor under the floor inspection port 8 provided on the first floor with the support member 12. In addition, the installation state is stable due to the weight of the device. Further, at the stage where the operation of releasing the contained water is completed, the supporting member 12 can be easily removed by pulling it up from the underfloor inspection port 8.
Furthermore, since the support member 12 is stored below the floor of the first floor at the underfloor inspection port 8 and does not protrude, it is placed on the forced exhaust device 9 using the periphery of the underfloor inspection port 8 ( It is protected by a lattice-shaped protective member 13 (which is fitted). That is, the protective member 13 is set to have almost the same installation height as the first floor surface.
It can be protected by a grid-like protective member 13 placed on the forced exhaust device 9 by using the periphery of the underfloor inspection port 8, and construction materials etc. are placed on the forced exhaust device 9 while ensuring the inflow of air. Can be prevented in advance, and the protective member 13 is fitted on the flange-like edge 12b of the support member 12 along the periphery of the underfloor inspection port 8, and its installation height is set to the first floor surface. The operator can walk freely on the forced exhaust system 9, and does not catch the ventilator when moving the load, ensuring good workability on site. Is done.

Since the forced exhaust device 9 having the above structure is a pressure type, a large amount of air necessary for dehumidifying the air can be secured by a single unit. When the forced exhaust device 9 is operated, the internal space of the housing 2 becomes a reduced-pressure atmosphere, and the release of excess moisture from building materials such as ALC building materials is promoted.
Furthermore, because it is installed at the inspection floor 8, it does not cause security problems even at night when there are no workers, and it causes trouble to the neighbors due to exhaust and noise. Nor.
By operating the forced exhaust device 9, the outside air is guided to the internal space of the housing 2, is forcedly circulated in the internal space of the housing 2, and is discharged to the outside again from the vent 3 a through the internal space of the foundation structure 1. However, it passes through the surroundings of the building material 2 of the housing 2 where the circulated outside air absorbs water, absorbs moisture from the surface of the building material, dries it, and promotes the release of moisture contained in the building material during construction work. . The operation of the forced exhaust device 9 is performed until the release of moisture contained in each building material is completed to some extent, and is continuously performed not only during the day when the worker is present but also at night.

Then, as shown in FIG. 7A, the upper structure of the building in which the moisture removal process (step S1-3) as described above is performed for a predetermined period (for example, 3 to 7 days) to complete the frame construction (step S1) is performed. An airtight construction (step S2) for forming an airtight layer on the housing 2 is performed.
In addition, although the said water removal process (step S1-3) belongs to a frame construction (step S1), according to the discharge | release condition of the moisture content of building materials, it continues on the other hand, performing airtight construction (step S2) and subsequent construction. It is also possible. Even in that case, the water removal process is completed for about 2 to 4 weeks from the start of work until before the building is completed. As described above, the water removal step is a step in which the forced ventilation device 9 is continuously operated, so that it can be performed without hindering other process operations.
The airtight construction (step S2) is performed by a contractor different from the contractor performing the above-mentioned frame construction (step S1), and the outside wall airtight process (step S2) in which the airtight heat insulating material 25 is arranged inside the outer wall. -1), along the roof slab, along the roof slab, along the roof slab (step S2-2), and along the first floor slab, along the floor slab, along the floor hermetic step (step S2). -3).
The exterior wall hermetic construction (step S2-1) includes an outer wall heat insulation process in which an airtight heat insulating material 25 is arranged along the inner surface of the outer wall, and a beam that supports the outer wall and a column that supports the beam. And a structural heat insulating step of disposing a heat insulating material. The structural heat insulating step is a step of providing an airtight heat insulating material 25 along either the inner surface or the outer surface of the structural member located on the outermost side to support the outer wall or the like among the structural members, In this embodiment, the airtight heat insulating material 25 is laid along the inner surface of the structural member.
Further, the airtight construction along the roof (step S2-2) is to lay the airtight heat insulating material 25 along the upper surface or the lower surface of the roof slab. In this embodiment, the airtight heat insulation is performed on the upper surface of the roof slab. The material 25 is laid, and then a waterproof layer is formed on the airtight heat insulating material 25.
In the floor-to-floor airtight process (step S2-3), the airtight heat insulating material 25 is laid on the floor slab 6a on the first floor as described above. A configuration provided below can also be employed.

In addition, the airtight heat insulating material 25 used by the said airtight construction (step S2) is formed by the hard plastic type plate-shaped heat insulation panel which has both airtightness and heat insulation, such as a phenol resin foam, This significantly restricts ventilation through the insulation panel. In each said heat insulation construction, the heat insulation layer is formed by mutually abutting a plurality of heat insulation panels.
Furthermore, the airtight layers formed by the respective airtight constructions (step S2) as well as the joints between the respective heat insulating panels are covered with an airtight tape, and the airtight heat insulating material is formed by being covered with the airtight tape. Thus, an airtight layer (heat insulating airtight layer) is formed inside the housing by 25 and the airtight tape.

In the exterior wall airtight construction (step S2-1), the airtight heat insulating material 25 is laid on the roof slab. However, in the outer wall heat insulation construction on the top floor, the beam that supports the roof slab is installed. The upper end of the airtight heat insulating material 25 to be covered is brought into contact with the roof slab, and the seam serving as a boundary between the roof slab and the airtight heat insulating material 25 is lined with an airtight tape or the like to ensure airtightness.
By completing the airtight construction (step S2) by the above construction, a heat insulating layer is formed on the housing 2 and an airtight layer is formed. Here, in this embodiment, for the purpose of confirming the airtight performance of the airtight layer formed by the airtight construction (step S2), the airtightness confirmation work (step S3) is performed after the completion of the airtight construction.

In the airtightness confirmation operation (step S3) shown in FIG. 7B, a differential pressure gauge 26 is provided over the inside and outside of the housing 2 and an opening and the like are closed, and the forced exhaust device 9 is installed after the preparation step. It comprises a differential pressure generating step that is activated to generate a differential pressure inside and outside the building, and a measurement step that measures the differential pressure inside and outside the building after the differential pressure step.
The differential pressure gauge 26 is a known one such as a U-tube manometer, a Bourdon tube-type differential pressure meter, a diaphragm-type fine differential pressure meter, etc. In this embodiment, a U-shaped tube portion 26a formed by bending a tube, One tube 26b connected to one end of the U-shaped tube portion and the other tube 26c connected to the other end are provided.
In the preparatory step, the tip of one tube 26b is not easily affected by the air blow by the forced exhaust device 9 in the housing 2, and the tip of the other tube 26c is affected by external wind in the outdoors. Install in a place that is difficult to receive. Moreover, since the through-hole 2a used as a ventilation hole after completion is formed in the outer wall of the housing | casing 2 in any position as above-mentioned, such as a ventilation hole for normal ventilation, the said through-hole is also formed in an airtight layer. In order to form the through hole 25a at a position opposite to 2a and to install the differential pressure gauge 26, either one of the tubes 26b and 26c is provided over the inside and outside of the housing 2 through the through holes 2a and 25a. The through holes 2a and 25a are filled with a filling material such as a filler to fill the gap.

In addition, the height position of the pressure difference measurement in a high building such as a three-story building or a large internal / external temperature difference is preferably near the neutral zone of the vertical pressure distribution. In order to ensure the accuracy of the measurement, it is preferable to confirm that the pressure difference distribution in the measurement target period in the building is within 10% of the internal / external pressure difference. Moreover, in the said preparation process, before measuring a pressure difference, in order to confirm the zero point of the differential pressure gauge 26, the tubes 26b and 26c are removed and the zero point of the differential pressure | voltage of a pressure difference measuring device is confirmed. .
Note that it is preferable to stop the forced exhaust device 9 after the measurement process is completed and measure the internal / external pressure difference at zero flow rate again to confirm that no pressure difference occurs before and after the measurement.
In addition, the differential pressure gauge 26 is installed as described above, and a normal opening such as a window or a through hole formed at the stage of the airtight construction is appropriately closed without gaps, and the casing is formed through the opening and the through hole. Ensure that air flow in and out is prevented.

Next, in the differential pressure generating step, as shown in FIG. 7C, the forced exhaust device 9 is activated to discharge the air in the upper structural body toward the under-floor space below the first floor slab. The inside is depressurized.
Here, the forced exhaust device 9 is a pressure type ventilator having a ventilation capacity of 1000 m ³ / hour as described above, and the forced exhaust device is installed in a completed building in order to perform local ventilation such as a kitchen range. at a significantly greater ventilation than normal ventilator is permanent (400 meters 3 ^/ hour ~600m 3 ^/ h approximately ventilation capacity) with a skeleton body can be vacuum, the skeleton body is decompressed than the outside air Even if it is a case, there is no possibility that the amount of ventilation will fall remarkably, and the inside of a housing will be decompressed by exhibiting predetermined ventilation ability.

In the present embodiment, the forced exhaust device 9 having the static pressure-air flow characteristic shown in FIG. 8 is adopted, and the inventor of the present application activates the forced exhaust device 9 to thereby have a floor of about 100 to 150 m ^2. We know that it is possible to generate a differential pressure of at least about 10 Pa on the inside and outside of a two-story housing having an area, and if this level of differential pressure can be confirmed, the differential pressure by the differential pressure gauge It has also been confirmed that this is sufficient for the measurement.
The forced exhaust device 9 having the static pressure-air flow characteristics has sufficient performance as a forced exhaust device used in the moisture removal process as described above.
In addition, since exhaust is performed to the underfloor space S by the forced exhaust device 9, the underfloor space surrounded by the housing 2 and the foundation structure can be in a pressurized state. For this reason, the differential pressure between the internal space of the enclosure 2 and the internal space of the foundation structure 1 (underfloor space S) is larger than the differential pressure between the internal space of the enclosure 2 and the outdoor space, When there is an air leakage path that connects the internal space of the housing 2 and the internal space of the foundation structure 1, the internal space of the basic structure 1 through the air leakage path is directed toward the internal space of the housing 2. Leakage can be overestimated, and as a result, the existence of the leakage path can be strictly evaluated. That is, when the internal / external differential pressure is extremely small, the existence of such an air leakage path can be suspected first. Ventilation due to temperature differences in winter and the like is likely to increase due to the air leakage path that exists below the chassis, so reducing the presence of the air leakage path as much as possible is effective in improving the airtight performance of the chassis. As described above, exhausting air toward the internal space of the foundation structure 1 has an advantageous effect on the discovery of the leakage path.

  Then, after starting the forced exhaust device 9 for a predetermined time to generate a differential pressure inside and outside the upper structure, the differential pressure Pa is measured with a differential pressure gauge, and the measured differential pressure Pa is made to correspond to the correspondence table, Check the airtight state at the time of the current measurement (measurement process). Thereafter, the forced exhaust device 9 is stopped, and the airtightness confirmation operation (step S3) is terminated.

As shown in FIG. 9, the above correspondence table is a graph G in which the total floor area of the frame is shown on the horizontal axis and the internal / external differential pressure is shown on the vertical axis, and the graph G has a gap characteristic value n = 1.67. In this case, the internal and external differential pressure P at which the effective gap area C of the frame is 3 cm ² / m ² is plotted against each total floor area, and the value of the measured differential pressure Pa is located below the graph G (Pa <P), while it is confirmed that the airtightness is sufficiently maintained (C = 3 cm ² / m ² or less), while the value of the measured differential pressure Pa is located on the upper side of the graph G (Pa > P), it is confirmed that hermeticity is not ensured (C = 3 cm ² / m ² or more).

但し、Ｑ：通気量（ｍ^３／ｈ、送風機により建物内外に圧力差を生じさせたとき、建物外皮の隙間を通して外から内へ、もしくは内から外へ流れる空気の量。また、本願においては強制排気装置の換気量に相当）
ａ：通気率（ｍ^３／ｈ・Ｐａ^１／ｎ、通気特性式の係数で、建物内外の圧力差が１Ｐａのときの１時間当たりの通気量）
ΔＰ：内外圧力差（Ｐａ、建物の内外圧力差）
ｎ：隙間特性値
また、相当隙間面積とは、総相当隙間面積を建物外皮内の実質延べ面積で除したものであり、以下の式２で示される。実質延べ床面積は建物によって明らかになるものであるから、総相当隙間面積を仮定することにより、相当隙間面積を仮定することができる。

但し、Ｃ：相当隙間面積（ｃｍ^２／ｍ^２、総相当隙間面積を建物外皮内の実質延べ床面積で除したもの）
αＡ：総相当隙間面積（ｃｍ^２、建物内外の圧力差９．８Ｐａ時の通気量から、隙間と等価の単純開口の有効面積を算出したもの）
Ｓ：実質延べ床面積（ｍ^２、原則的に建物外皮内の換気にかかわる部分の延べ床面積） Here, the gap characteristic value indicates the state of the gap, and indicates the slope of a straight line when the airflow characteristic expression represented by the following expression 1 is expressed in logarithm, and is 1.0 to 2.0. If each gap is very narrow, n approaches 1.0, and as it becomes wider, n approaches 2.0. The inventor of the present application has confirmed that the gap characteristic value is within the range of 1.5 to 1.7 in a building such as a house by repeating a verification test and the like. Any numerical value suitable for the building within the range may be adopted.

However, Q: Ventilation rate (m ³ / h, the amount of air flowing from outside to inside or from inside to outside through a gap in the building skin when a pressure difference is generated inside and outside the building by a blower. Equivalent to forced exhaust ventilation
a: Ventilation rate (m ³ / h · Pa ^{1 / n} , coefficient of ventilation characteristic formula, ventilation rate per hour when the pressure difference inside and outside the building is 1 Pa)
ΔP: Pressure difference between inside and outside (Pa, pressure difference inside and outside the building)
n: Gap characteristic value The equivalent gap area is obtained by dividing the total equivalent gap area by the substantial total area in the outer skin of the building, and is expressed by Equation 2 below. Since the actual total floor area is determined by the building, the equivalent gap area can be assumed by assuming the total equivalent gap area.

C: equivalent gap area (cm ² / m ² , total equivalent gap area divided by the total floor area in the building skin)
αA: Total equivalent clearance area (cm ² , the effective area of a simple opening equivalent to the clearance calculated from the air flow rate when the pressure difference between inside and outside the building is 9.8 Pa)
S: Real total floor area (m ² , in general, the total floor area of the part related to ventilation inside the building skin)

As shown in FIG. 8, when the internal / external differential pressure is set to a low static pressure of about 10 Pa, for example, the forced exhaust device has a relatively small decrease in the air volume with respect to the internal / external differential pressure (static pressure). , It is not necessary to perform correction based on a decrease in the air volume due to the internal / external differential pressure. On the other hand, for example, when the internal / external differential pressure is about 10 Pa or more, the air volume is reduced due to the internal / external differential pressure. Therefore, in the creation of the correspondence table, a graph is prepared in anticipation of such air volume reduction. It is necessary to keep.
Moreover, although the said graph changes inclination and a shape with the value of the gap characteristic value n of a building, and the value of the equivalent gap area C which should be assumed, an appropriate graph is produced according to the building to be verified, It is desirable to adopt as a comparison target of measured values. In the present embodiment, the correspondence table as described above is adopted, but the correspondence table is not limited to the above-mentioned one, and to some extent the gap characteristics of the building to be verified and the equivalent gap area required for the building. This includes a graph created in advance that fits the actual situation of the building, which is obtained by considering the allowable value and safety factor. In addition, the correspondence table includes a graph prepared by changing one or both of the gap characteristics and the equivalent gap area. In the correspondence table, the graph to be used according to the building to be verified. It is possible to take measures such as pre-determining the value, thereby further facilitating the verification.
Furthermore, even when comparing the graph and the obtained coordinates, it is assumed that airtightness is secured to some extent below the graph used, or airtightness is not secured to some extent above the graph used, etc. It is also possible to use the graph as a measure of airtightness judgment according to the actual situation of the casing 2 to be measured.

  In addition, the airtightness confirmation operation (step S3) is performed using the above-described forced exhaust device 9 for forming a differential pressure inside and outside the housing 2, and the differential pressure gauge 26 is also installed through the above-mentioned through-hole. The preparation process can be made very easily by being done through the hole, and the preparation process is completed in about 10 minutes even if it takes time to open the opening of the housing 2. In addition, the differential pressure generating step of stabilizing the ventilation amount (or air volume) of the forced exhaust device 9 and setting the differential pressure inside and outside the housing to a certain steady state only requires about 1 minute. Further, according to the forced exhaust device 9, it is possible to generate a differential pressure of about 10 Pa, so that even the differential pressure gauge 26 as described above shows a sufficiently visible differential pressure, As a result, the differential pressure confirmation work for confirming the differential pressure can be completed in a few seconds. Therefore, the airtightness confirmation work (step S3) can be completed in about an hour or less, including the work for removing the differential pressure gauge 26. This is done in a very short time and easily.

When it is confirmed by referring to the correspondence table that the differential pressure Pa is greater than the internal / external differential pressure P required to maintain the C value required for the housing 2, As shown in FIG. 9, it is judged that the desired airtightness is not secured for the housing 2 in the airtight construction (step S2) (step S3-1), and the contractor who performed the airtight construction secures the airtightness. Therefore, inspections and repairs for ensuring airtightness are performed (steps S2-1, S2-2, S2-3).
Moreover, when it is confirmed that the differential pressure Pa is smaller than the internal / external differential pressure P required to maintain the C value required for the housing 2, the airtightness of the housing is required by the airtight construction. It is judged that it is secured more than the airtightness to be performed (step S3-1), and the contractor who performed the airtight construction completes the airtight construction and the casing 2 moves to the next process.

Next, the facility construction (step S4) shown in FIG. 10A is performed by a contractor different from the contractor performing the airtight construction. The facility construction means a water pipe process (step S4-1) in which water pipes and drain pipes are arranged inside and outside the casing 2, and an electric wiring process in which electrical wiring is carried out inside and outside the casing 2 ( Step S4-3) and the like, and these constructions are performed by the same contractor or different contractors.
Moreover, although these facilities construction has formed the airtight layer in advance, the through-hole which penetrates the outer wall of the housing 2 and the airtight layer is opened, and piping, wiring, etc. (hereinafter, referred to as the following) This is accompanied by construction for arranging the pipes 27 and the like. After the pipes 27 are arranged, the through holes are filled with a filler or the like to close the gap. In this work (airtight recovery process (steps S4-2 and S4-4)), the airtightness is temporarily deteriorated by opening the hole, but the airtightness is temporarily recovered by sealing the gap by filling the filler. It is thought that it is done.

In the present embodiment, in order to confirm the change in the airtightness of the housing 2 due to the equipment construction (step S4) as described above, the through-hole opened as shown in FIG. 10B after the equipment construction (step S4) is completed. The above-mentioned airtightness confirmation operation is performed again in a state where the hole is closed, the differential pressure Pb at the measurement time of the housing 2 is measured, and it is confirmed whether the measurement value is located above or below the graph G (step) S5).
When the differential pressure Pb is located above the graph G, it is determined that the airtightness of the housing is deteriorated from the required airtightness by the above-described facility construction as shown in FIG. 9 (step S5−). 1) The contractor who has installed the equipment performs inspections and repairs for ensuring airtightness around the parts processed to ensure airtightness (steps S4-2 and S4-4).
Moreover, when the said differential pressure Pb is located below the graph G, it is judged that the airtightness of a housing is ensured more than the airtightness requested | required in spite of having performed the said equipment construction ( In step S5-1), the contractor who performed the facility construction completes the construction and completes the construction of the frame 2 through interior construction, finishing construction, and the like (step S6).

According to this embodiment, since the airtightness of the housing 2 is verified using the forced exhaust device 9 provided in the housing 2 at the stage where the airtight construction (step S2) is completed, the steps up to the airtight construction (step S2) are performed. Airtightness in construction can be verified, and it can be confirmed that one's own work responsibility has been achieved. In addition, this makes it possible to clarify the location of responsibility at the time of completion of each process for the airtightness of the building, and as a result, for example, between the airtight construction contractor and the equipment contractor, the construction that impairs the airtightness. There is no risk of unnecessary conflicts such as whether they have gone.
Further, as the forced exhaust device 9, a device that introduces outside air into the internal space of the housing and promotes the release of moisture contained in the building material can be diverted. Therefore, it is necessary to prepare and install the forced exhaust device 9 only for airtightness confirmation. No airtightness can be confirmed while avoiding delays in construction. Further, by ensuring a predetermined ventilation amount from the forced exhaust device 9, it is possible to ensure a differential pressure inside and outside the building, and although the accuracy of measurement is not so high, a simple differential pressure gauge 26 is used in advance. By using the created correspondence table as shown in FIG. 9, it is possible to inspect the airtight variation at each construction stage with sufficient accuracy. In addition, since the forced exhaust device 9 is installed in the underfloor inspection port 8, the underfloor space S surrounded by the casing 2 and the foundation structure 1 can be brought into a pressurized state, and the internal space of the casing 2 and the underfloor The differential pressure with the space S is larger than the differential pressure between the internal space of the housing 2 and the outdoor space by an amount of pressurization, and thus the air leakage path that connects the internal space of the housing 2 and the internal space of the foundation structure 1. Can be evaluated strictly. Further, the forced exhaust device 9 can be easily installed just by dropping it into the underfloor inspection port 8 and can be removed very easily, so that workability is good. Furthermore, since the installation of the forced exhaust system 9 and the measurement of the differential pressure, etc. are simple, the airtightness can be measured appropriately according to the progress of the construction, and excluding external conditions (temperature, humidity, etc.) In principle, measurements are always made under the same conditions, so the reliability of the measurement results according to the progress of construction is relatively high.

  For reference, according to the test method for airtightness of houses based on “House's airtightness performance testing method” (published by: Building Environment and Energy Conservation Organization, edited by: Airtightness Measurement Technology Promotion Committee) A thermometer, a blower, a flow rate measuring device, a flow rate measuring device, and a pressure difference measuring device are required, and it takes about 60 to 120 minutes to complete one test. It becomes necessary.

As mentioned above, although embodiment of the airtightness confirmation method of the building under construction of this invention was explained in full detail, this invention is not limited only to the said embodiment.
For example, in the airtightness confirmation work after the above airtight construction, only the differential pressure is confirmed and the differential pressure immediately after completion of the airtight construction is recorded, and then the airtightness confirmation work immediately after completion of the equipment construction is performed again. It is also possible to confirm the differential pressure and adopt a configuration for comparing the magnitudes of these two recorded differential pressures. According to the airtightness confirmation method, it is only necessary to compare the differential pressure and to construct the equipment. It can be confirmed whether or not the airtightness has deteriorated more than immediately after the completion of the airtight construction, and to what extent the airtightness has deteriorated.
In addition, equipment construction can take a form in which a plurality of constructions such as piping equipment construction, electrical equipment construction, etc. are sequentially performed by different contractors, and in this kind of equipment construction, each time each construction is completed, It is possible to adopt a configuration in which airtightness confirmation work is performed and how the airtightness fluctuates in each construction is clarified, or a construction in which the entire construction is advanced can be adopted. The location of responsibility for gender can be clarified.

In addition, not only between different contractors, but also between the same contractors, confirming at which point the airtightness has been lost by performing the above airtightness confirmation work at the completion of each construction. As a result, it is possible not only to clarify the location of the responsibility for airtightness among the workers, but also to identify the site where the airtightness has been lost, leading to deterioration of the airtightness. It is possible to ensure the airtightness of the casing until the final process while minimizing the rework of the entire construction.
Moreover, in each construction, it is not necessary to observe the above-mentioned order in each construction. For example, the order of the processes in each construction is changed as appropriate, for example, the exterior wall airtight process is performed after the roof insulation process in the airtight construction. It is possible. In addition, other constructions such as waterproofing that finish the chassis can be appropriately performed after the chassis construction, at the same time as the airtight construction and facility construction, or before and after these constructions.

It is a flowchart which shows the construction process of the building containing the airtight verification process which concerns on this invention. It is a schematic sectional drawing of the building where the airtight verification method which concerns on this invention is implemented. (A) is a schematic cross-sectional view of a housing that is referred to when examining the amount of ventilation necessary for releasing moisture contained in building materials in a housing of a two-story house, and (b) is a forced exhaust device. It is a schematic sectional drawing which shows the state which installs and drive | operates. It is sectional drawing which shows the state which attached the forced exhaust apparatus to the floor under inspection port of the building. It is a top view of the support member to which a forced exhaust apparatus is attached. It is a top view of the protection member arrange | positioned on a forced exhaust apparatus. It is a cross-sectional schematic diagram which shows the airtight verification method after an airtight construction process, and is a figure at the time of airtight construction being completed. It is a cross-sectional schematic diagram which shows the airtight verification method after an airtight construction process, and is a figure which shows the state which installed the differential pressure gauge and the forced exhaust apparatus. It is a cross-sectional schematic diagram which shows the airtight verification method after an airtight construction process, and is a figure which shows the state which is operating the forced exhaust apparatus for airtightness verification. It is a graph which shows the static pressure-air volume characteristic of the forced exhaust apparatus used in embodiment of this invention. It is a correspondence table | surface of the differential pressure | voltage inside and outside an upper structure, and an airtight state. FIG. 8 is a schematic diagram similar to FIG. 7A showing an airtight verification method after facility construction, and is a diagram at the time when facility construction is completed. It is a schematic diagram similar to FIG. 7B showing the airtightness verification method after facility construction, and is a diagram showing a state in which a differential pressure gauge and a forced exhaust device are installed. FIG. 8 is a schematic view similar to FIG. 7C showing the airtightness verification method after facility construction, and is a view showing a state in which a forced exhaust device is operated for airtightness verification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Basic structure 2 Housing 3a, 3b Ventilation port 4 Beam 5 Wall 6 Floor 6a First floor slab 6aa Floor panel surface 6b Second floor slab 7 Roof 8 Inspection port 9 Forced exhaust device (forced exhaust equipment)
DESCRIPTION OF SYMBOLS 10 Blow-off part 11 Opening part 12 Support member 13 Protection member 14 Frame member 15 Opening frame member 16 Outer frame member 17 Seat 18 Frame 18a Frame frame 18b Arm part 19 Drive shaft 20 Blade member 21 Fastening means 22 Baffle plate 23 Connection means 25 Airtight heat insulating material 26 Differential pressure gauge 26a U-shaped pipe part 26b One tube 26b The other tube 27 Piping etc. S Underfloor space

Claims (6)

After building the upper structure on the foundation structure and installing the outer wall and building materials such as the roof on the upper structure to form the housing, we completed the airtight construction to form an airtight layer on the housing An airtight verification method for a building under construction in which a pressure difference is generated inside and outside the building under construction to verify the airtightness of the building,
By operating a forced exhaust facility provided on the housing after the airtight construction is completed and exhausting the housing, a differential pressure is generated inside and outside the housing, and the airtight state of the housing is confirmed based on the differential pressure. An airtight verification method for a building under construction, characterized by comprising an airtight confirmation process.   2. The building under construction according to claim 1, wherein the forced exhaust facility is a forced exhaust device that is installed to introduce outside air into an internal space of a housing to promote release of moisture contained in the building material. Hermetic verification method. After the airtight construction, equipped with facility construction to perform construction with the formation of through holes such as air holes penetrating the outer wall and airtight layer of the housing,
The airtightness confirmation process includes
At the time of completing up to the airtight construction, by performing forced exhaustion by the forced air supply and exhaust device, an initial airtight confirmation step for confirming airtightness by generating a differential pressure inside and outside the housing,
After completing the facility construction, by performing forced exhaust by the forced air supply / exhaust device, an airtight confirmation step after facility construction for confirming airtightness by generating a differential pressure inside and outside the housing,
The airtight verification method for a building under construction according to claim 2, comprising: Perform the facility construction multiple times,
Every time each facility construction is completed, an after-construction airtightness confirmation process is performed to confirm the airtightness of the enclosure after the facility construction based on the internal / external differential pressure generated by forced exhaust by the forced exhaust device,
The airtight verification method for a building under construction according to claim 3. The forced exhaust device is
A support member mounted on a frame material that forms an opening edge of the opening formed in the housing;
A ventilation fan body attached to the support member, for sucking air in the internal space of the housing and exhausting it outside the housing;
A protective member disposed on the windward side of the ventilation fan body to protect the ventilation fan body;
5. The method for verifying airtightness of a building under construction according to claim 1, further comprising: a wind direction changing member that is disposed leeward of the ventilation fan main body and changes an exhaust flow.   6. The opening in which the forced exhaust device is installed communicates the internal space of the frame constructed on the foundation structure formed by the frame construction with the internal space of the foundation structure. The airtightness verification method for the building under construction described in 1.

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