JP4968690B2 - Front room facilities for isolation area - Google Patents

Description

  The present invention relates to an anterior room facility attached to an isolation area for handling harmful substances such as asbestos and performing various operations such as removal and detoxification.

  When dismantling and removing a building where asbestos is used, or when removing asbestos in a building, it is necessary to reliably prevent asbestos from being scattered around. For this reason, the asbestos is usually isolated by partitioning the work area with a sheet material and isolating it in an airtight manner from the surroundings, and maintaining the negative pressure in the isolation area by forced exhaust from the isolation area. We try to prevent it from flowing out or leaking out of the area.

In that case, the entrance and exit for workers to enter and exit the isolation area can prevent asbestos from inadvertently flowing out and leak through the entrance and exit, and maintain a negative pressure in the isolation area. However, it is necessary to have a function that allows workers to go in and out. Therefore, conventionally, a front room facility having such a function is generally installed outside the entrance to the isolation area.
3 to 4 show an example of a conventional front room facility 5 for that purpose. This is the same as the clean room for asbestos removal workers shown in Patent Document 1, and the front room 11, the washing room 12, and the changing room 13 are formed on the outside of the entrance to the isolation area 1. In addition, a cleaning device 14 such as an air shower device is installed in the cleaning chamber 12.

In this front room facility 5, when an operator enters the isolation area 1 from the outside, after changing into work clothes in the changing room 13 and wearing protective equipment such as a mask and glasses, the cleaning room 12 and the front room 11 Will enter the isolation area 1 through.
When the worker goes out of the isolation area 1, he first takes off the work clothes while wearing the protective equipment in the front chamber 11, takes an air shower in the cleaning chamber 12, and removes asbestos adhering to the body. The procedure is to remove the protective equipment in the changing room 13 and go outside after removing it by blowing it down.
Of course, since the asbestos is attached to the work clothes taken off in the front chamber 11, it is separately collected and cleaned, and the asbestos that is removed by the air shower and blown off is appropriately provided with a filter provided in the cleaning device 14 or separately provided. It will be collected and collected by this filter.

The front room facility 5 functions not only as a passage for workers to enter and exit, but also functions as an air inflow path from the outside into the isolation area 1. It also has a function of preventing the outflow of the water and maintaining the inside of the isolation area 1 at an appropriate negative pressure.
That is, a negative pressure dust remover 2 is installed in the isolation area 1, and the negative pressure dust remover 2 constantly exhausts the exhaust gas from the isolation area 1. Although the pressure is maintained, the air corresponding to the displacement is always sucked and flows into the isolation area 1 through the front room facility 5, and therefore, from the isolation area 1 in the front room facility 5. There is no room for backflow to the outside, so that asbestos outflow and leakage through the anterior chamber facility 5 are reliably prevented.
And in order to give moderate pressure loss with respect to the inflow outdoor air which flows in through the front room equipment 5, in addition to the entrance / exit provided in the isolation area 1 as shown in FIG. The chambers 13 are also provided with doorways, and the doors 3 are each provided with a simple door 3 made of a flexible sheet material such as a vinyl sheet. Each of these simple doors 3 naturally opens to the inside appropriately according to the pressure difference between the inside and outside (more precisely, a slight gap is naturally formed by being blown inward by being blown by the wind pressure). Accordingly, an appropriate ventilation resistance, that is, a pressure loss is generated in the air flow flowing from the outside into the isolation area 1 through the front room facility 5, and the negative pressure corresponding to the pressure loss is maintained in the isolation area 1. It has become so.
Japanese Patent Laid-Open No. 2007-303165

By the way, the cleaning device 14 provided in the cleaning chamber 12 in the above-mentioned front room facility 5 blows off and blows off asbestos adhering to the worker by blowing an air shower with a large air volume and large air pressure to the worker. Therefore, when this is used, it is preferable to seal the cleaning chamber 12 in order to prevent inadvertent scattering of asbestos.
However, as described above, the conventional front room facility 5 also serves as an air inflow path to the isolation area 1, so that the simple doors 3 made of sheet material are only provided before and after the cleaning room 12. It is difficult to seal the cleaning chamber 12 with such a simple door 3.
Of course, in order to seal the cleaning chamber 12, the simple door 3 before and after it is changed to an airtight door, for example, because the air inflow path is blocked and the inside of the isolation area 1 becomes excessive negative pressure. In order to prevent this, it may be possible to secure a separate inflow path somewhere other than the front room facility 5 to prevent backflow in the front room facility 5 and cause asbestos to flow out. Both are unfavorable and unrealistic.

  In view of the above circumstances, an object of the present invention is to provide an effective and appropriate front room facility that can seal a cleaning room in this type of front room facility and that can function as an air inflow path without any problem. And

  The present invention is attached to an isolation area that is isolated from the surroundings in an airtight manner to handle harmful substances such as asbestos and the inside thereof is maintained in a negative pressure state, while maintaining the negative pressure state in the isolation area, and While preventing the outflow of harmful substances from the isolation area to the outside, it functions as a passage for workers to enter and leave the isolation area and is maintained by maintaining a negative pressure in the isolation area. A front chamber functioning also as an inflow path of air flowing into the isolation area from the outside due to a pressure difference between the inside and outside, and a front chamber disposed outside the entrance to the isolation area, and communicates with the front chamber Consists of a washing room and a changing room that leads to the washing room, the changing room is provided with an entrance that leads to the outside, and a washing device is installed in the washing room for removing harmful substances by suction, The Between the cleaning room and the front chamber, and between the cleaning room and the changing room, the cleaning room is closed when the cleaning device is used, so that the cleaning room is separated from both the changing room and the front room. Air-tight doors that can be partitioned in an air-tight manner, and a bypass duct that bypasses the cleaning room and directly connects the changing room and the front room between the changing room and the front room. The bypass duct is provided with a backflow prevention mechanism that allows air to flow from the changing room to the front room and prevents backflow of air from the front room to the changing room. To do.

  As the backflow prevention mechanism in the present invention, a backflow prevention valve that uses a flexible sheet material that closes by its own weight and opens against its own weight by the inflow of air from the changing room to the front chamber can be suitably employed. .

According to the front chamber facility of the present invention, since the airtight doors are provided before and after the cleaning chamber, it is possible to prevent asbestos from being inadvertently scattered during cleaning.
In addition, since a bypass duct that bypasses the cleaning chamber is provided, the front chamber equipment can function as an air inflow path without any trouble even if the cleaning chamber is sealed with an airtight door. There is no need for back flow to the outside through the front room facilities.
Furthermore, since the bypass duct is provided with a backflow prevention mechanism, it is possible to effectively prevent the backflow of air from the isolation area to the outside even if the isolation area side becomes positive pressure.

  In particular, by using a backflow prevention valve that uses a sheet material as a valve body as a backflow prevention mechanism, not only has a sufficient backflow prevention function, but also the air flow status can be confirmed by visual observation of the valve body, Thereby, it can be confirmed whether or not the isolation area is maintained in a proper negative pressure state.

  1 to 2 show an anterior chamber facility 10 according to an embodiment of the present invention. This is an improvement of the conventional anteroom facility 5 shown in FIGS. 3 to 4 and is basically installed and used in the same manner as the conventional one except for the points described below. Therefore, elements common to both are denoted by common reference numerals, and the description will be simplified.

  The front room facility 10 of the present embodiment is composed of a front room 11, a cleaning room 12, and a changing room 13 as in the prior art. A cleaning device 14 such as an air shower device is installed in the cleaning room 12, and as a whole. A quadruple entrance / exit is provided, and also functions as an air inflow path for allowing external air to flow into the isolation area 1 by the differential pressure generated inside and outside the isolation area 1. The facility 10 is characterized in that an airtight door 15 is provided at the front and rear entrances of the cleaning chamber 12 in place of the conventional door 3 made of a sheet material so that the cleaning chamber 12 can be sealed.

  That is, in the prior art, the simple doors 3 made of sheet material were provided at all the entrances in order to make the front room facility 5 itself function as an air flow passage, whereas in this embodiment, the entrances to the isolation area 1 and changing clothes Similarly, a simple door 3 made of a sheet material is provided at the entrance to the chamber 13, but at the entrance between the front chamber 11 and the cleaning chamber 12 and at the entrance between the cleaning chamber 12 and the changing chamber 13. Is provided with an airtight door 15 made of steel or wooden or hard resin, and when using the cleaning chamber 12, the airtight door 15 can be closed to seal the cleaning chamber 12, so that asbestos is not prepared at the time of cleaning. Is prevented from being blown away.

In addition, in the present embodiment, the air flow into the isolation area 1 through the front room facility 10 is hindered when the airtight doors 15 are closed in connection with the provision of such airtight doors 15. In order to compensate for this, a bypass duct 16 is provided in the upper part of the cleaning chamber 12, and the bypass duct 16 is provided with a backflow prevention mechanism 17.
The bypass duct 16 is installed in a state in which both ends thereof are opened to the front chamber 11 and the changing room 13 so as to directly connect both chambers (that is, in a state of bypassing the cleaning chamber 12). In consideration of the air inflow required to maintain a proper negative pressure, it is set so that an appropriate pressure loss occurs, and normally the passing flow velocity is within the range of about 0.1 to 5.0 m / s. However, it is preferable to have a flat rectangular cross section as shown in consideration of the installation space so that the effective ceiling height of the cleaning chamber 12 does not become too small.

  The backflow prevention mechanism 17 in the present embodiment uses a flexible sheet material (for example, a 0.15 mm thick polyethylene sheet) made of the same material as the sheet material forming the isolation area 1 and the sheet material used as the simple door 3. The valve 18 is a backflow prevention valve, and the upper part of the valve body 18 is fixed so as to be swingable. In the natural state, the valve duct 18 is suspended by its own weight and the front end of the bypass duct 16 is closed. When the pressure on the chamber 11 side is more positive than the side of the changing room 13, the valve body 18 is pressed against the tip of the bypass duct 16 to close the bypass duct 16, thereby moving from the front chamber 11 to the side of the changing room 13. It is possible to effectively prevent the reverse flow of the air flow that is directed.

When the isolation area 1 is used, the backflow prevention mechanism 17 has a negative pressure inside thereof and a pressure difference between the inside and outside of the isolation area 1. Thus, the valve body 18 is automatically opened against its own weight. That is, as shown in FIG. 2, the valve body 18 is lifted by the wind pressure like the simple door 3 and flutters inward, so that a slight gap is naturally formed between the valve duct 18 and the bypass duct 16. A series of air inflow paths for directly communicating the changing room 13 and the front room 11 are secured by opening the front end of the door.
Therefore, in the front room facility 10 of the present embodiment, air from the outside is sucked into the changing room 13 through the simple door 3, and the air passes from the changing room 13 through the bypass duct 16 (that is, bypasses the washing room 12). In this case, the air flows into the front chamber 11 and flows into the isolation area 1 from the front chamber 11 through the simple door 3, so that even when the airtight doors 15 before and after the cleaning chamber 12 are closed. The air inflow path can be secured without any trouble, and the inside of the isolation area 1 can be maintained at an appropriate negative pressure. There is no room for the isolation area 1 to become an excessive negative pressure or to generate a backflow in the front room facility 10. .

As described above, according to the front chamber facility 10 of the present invention, since the airtight doors 15 are provided before and after the cleaning chamber 12, it is possible to prevent inadvertent scattering of asbestos during cleaning.
In addition, since the bypass duct 16 for bypassing the cleaning chamber 12 is provided, the front chamber facility 10 can function as an air inflow path without any trouble even if the cleaning chamber 12 is sealed by the airtight door 15. There is no need to provide an air inflow path, and no back flow to the outside occurs through the front chamber facility 10.
Furthermore, since the bypass duct 16 includes the backflow prevention mechanism 17, even if the isolation area 1 side becomes positive pressure, it is possible to effectively prevent the backflow of air from the isolation area 1 to the outside.

In addition, since the backflow prevention valve using the sheet material as the valve body 18 is used as the backflow prevention mechanism 17, not only has a sufficient backflow prevention function, but also the air circulation state is confirmed by visual observation of the valve body 18. Thus, it can be easily confirmed whether or not the isolation area 1 is maintained in a proper negative pressure state.
That is, conventionally, in order to confirm whether or not the inside of the isolation area 1 has an appropriate negative pressure, the pressure in the isolation area 1 is directly measured by a micro differential pressure gauge, or the inside of the front room facility 5 is appropriately air In order to check whether or not the air is circulating, it is necessary to conduct a test by flowing smoke. However, in the case of the front room facility 10 of the present embodiment, the valve of the backflow prevention mechanism 17 is substituted for these operations. It is sufficient to visually observe the body 18, and such a simple and simple method can contribute to reduction of work and improvement of safety and reliability of the entire facility.

  Although one embodiment of the present invention has been described above, the above embodiment is merely a preferred example, and the present invention is not limited to the above embodiment, and various design modifications as listed below, for example. And can be applied.

In the above embodiment, the interior of the front chamber facility 10 is divided into three chambers so that the center is the cleaning chamber 12, but the cleaning chamber 12 is configured as an independent unit, and the front chamber 11 and the dressing are changed on both sides. It is also conceivable to connect the chamber 13 to an airtight cage.
In that case, the airtight doors 15 are attached to both sides of the unit as the cleaning chamber 12, installed inside or outside in the cleaning device 14, and the bypass duct 16 and the backflow prevention mechanism 17 are incorporated in the ceiling portion. If such a unit is manufactured in a factory with appropriate standards and specifications, the front room facilities can be obtained simply by bringing it into the field and installing the front room 11 and the changing room 13 before and after that. 10 can be installed easily, and after the work there is completed, it can be used again after being properly cleaned and transferred to other work facilities.
Of course, not only the cleaning room 12 but also the whole room including the front room 11 and the changing room 13 can be integrated into one unit, or each unit can be manufactured as a unit of a desired standard that can be appropriately connected.

The shape and size of each room constituting the front room facility 10 is arbitrary as long as it can function as a passage for workers to at least the isolation area 1 and is large enough to be used simultaneously by many people. It can also be considered.
Further, it is conceivable to arrange the chambers in an L shape as well as in a row as in the above embodiment. In that case, instead of connecting or connecting the front chamber 11 and the changing room 13 to the two opposing wall surfaces of the cleaning chamber 12 as in the above embodiment, they are adjacent to each other in the orthogonal state. The airtight doors 15 may be provided on the two wall surfaces.

  Of course, the cross-sectional shape and size of the bypass duct 16, the installation position, and the configuration of the backflow prevention mechanism 17 may be any as long as they can satisfy the functions and performances described in the above-described embodiment. Various configurations can be changed in various ways.

  Furthermore, in the above embodiment, the entrance / exit from the front chamber 11 to the isolation area 1 and the entrance / exit from the outside to the changing room 13 are the simple doors 3 made of a sheet material as in the conventional case. It is also conceivable to provide an airtight door 15 as provided at the front and rear. However, even in that case, it is necessary to secure an inflow path for allowing air to flow into the isolation area 1 from the outside through the changing room 13, the bypass duct 16, and the front chamber 11 as in the above-described embodiment. It is necessary to secure an air flow path between the front chamber 11 and between the changing room 13 and the outside, for example, by providing a louver for ventilation in the airtight door 15.

  The above embodiment assumes an application example in the case of performing asbestos removal work for an existing building. However, the front room facility of the present invention is not limited to such a case, and the inside of the isolation area is negatively affected. Needless to say, the present invention can be widely applied to facilities that need to prevent scattering of harmful substances under pressure, for example, treatment facilities for cleaning contaminants.

It is a whole top view which shows schematic structure of the front chamber equipment which is embodiment of this invention. FIG. 2 is an elevational sectional view (a view taken along line II-II in FIG. 1). It is a whole top view which shows schematic structure of the conventional general anteroom equipment. FIG. 4 is an elevational sectional view (IV-IV line view in FIG. 3).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Isolation area 2 Negative pressure dust remover 3 Simple door 10 Front room equipment 11 Front room 12 Cleaning room 13 Changing room 14 Cleaning device 15 Airtight door 16 Bypass duct 17 Backflow prevention mechanism (backflow prevention valve)
18 Disc

Claims (2)

In order to handle harmful substances such as asbestos, it is isolated from the surroundings in an airtight manner and is attached to an isolation area where the inside is maintained in a negative pressure state, while maintaining the negative pressure state in the isolation area and from the isolation area While preventing the outflow of harmful substances to the outside, it functions as a passage for workers to enter and leave the isolation area, and the difference between the inside and outside caused by maintaining a negative pressure in the isolation area It is a front room facility that also functions as an inflow path for air flowing into the isolation area from the outside due to pressure,
It is constituted by a front chamber arranged outside the entrance to the isolation area, a cleaning chamber leading to the front chamber, and a changing room leading to the cleaning chamber, and an entrance leading to the outside is provided in the changing chamber,
A cleaning device for removing harmful substances by suction is installed in the cleaning chamber, and the cleaning device is provided between the cleaning chamber and the front chamber and between the cleaning chamber and the changing room. Airtight doors that can be closed in use and can be partitioned in an airtight manner with respect to both the changing room and the front room are installed.
In addition, a bypass duct is provided between the changing room and the front room to bypass the cleaning room and directly connect the changing room and the front room. A front room facility for an isolation area, characterized in that a backflow prevention mechanism is provided that allows air to flow into the front room and prevents backflow of air from the front room to the changing room. The front room equipment for the isolation area according to claim 1,
The backflow prevention mechanism is a backflow prevention valve that uses a flexible sheet material that is closed by its own weight and opened against the own weight by the inflow of air from the changing room to the front chamber. Front room facilities to the area.

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