JP2012163579A - Asbestos dust generation amount measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To directly measure an asbestos dust generation amount from a surface of an asbestos inclusion as a measuring object.SOLUTION: The present invention comprises: a cover 2 to air-tightly cover a circumference of a measurement object area; a collection mechanism 3 which is air-tightly attached to the cover and collects asbestos dust with a membrane filter 3a by sucking air inside the cover; an intake pipe 4 to suck the air inside the cover through the collection mechanism; a suction pump 5 connected to a base end of the intake pipe; an injection pipe 7 which is installed in a manner that penetrates the cover and sprays the air outside the cover to the measurement object area through a tip thereof by suction force of the suction pump; a scattering prevention plate 10 to receive asbestos peeled off from the measurement object; a suction mechanism 14 to suck the air from a gap between the scattering prevention plate and the measurement object; and the collection mechanism to collect the asbestos from the air suctioned by the suction mechanism. The scattering prevention plate has a sticky surface enabling the asbestos to adhere thereto.

Description

  The present invention relates to an apparatus for measuring asbestos dust generation from the surface of an asbestos-containing material.

As is well known, asbestos (asbestos) has been widely used in various fields including building materials in the past because it has excellent physical properties, but in recent years it is clear that the dust causes serious health damage. It has become a big social problem.
In order to take measures against asbestos dust, it is indispensable to grasp the concentration of asbestos dust in the ambient air. Therefore, the “Asbestos Monitoring Manual” has been formulated as a technical guideline for measuring the asbestos dust concentration in the ambient air. (Refer nonpatent literature 1).

“Asbestos Monitoring Manual (Revised Version)”, Air Quality Control Division, Air Quality Control Bureau, December 1993, p.1-6

The measurement method of asbestos dust concentration stipulated in the above manual measures the amount of asbestos dust in the atmosphere by sampling the atmosphere continuously over a long period of time at the measurement target point and passing it through a filter paper (membrane filter) for collection. It is based on doing.
However, although such measurement methods can measure the average concentration in the atmosphere near the measurement target point, for example, the amount of dust generated from a specific building material can be measured directly or the location of dust generation can be specified. There is nothing you can do.
Therefore, the above measurement method alone is not always sufficient, and in taking higher measures, not only the average concentration measurement in the ambient air, but also the asbestos dust from specific members is directly measured. In addition, it is necessary to establish a measurement method that can measure the possibility of asbestos dust generation and the degree of deterioration of building materials that would lead to it.

  In view of the above circumstances, an object of the present invention is to provide an effective and appropriate measuring apparatus capable of directly measuring the amount of asbestos dust generated from the surface of an asbestos-containing material.

  The invention according to claim 1 is an apparatus for measuring the amount of asbestos dust from a specific part of the surface of an asbestos-containing material as a target, the cover covering the measurement target part in an airtight manner, and the cover And a trapping mechanism for sucking air in the cover and collecting asbestos dust by a membrane filter, and a trapping mechanism connected to the trapping mechanism for collecting the air in the cover. An intake pipe for suction through the intake pipe, an intake pump connected to the proximal end of the intake pipe, and the cover is provided so as to suck the air outside the cover by the suction force of the intake pump and its tip In order to prevent the scattering of the asbestos that peels off from the vicinity of the measurement target part when the cover is attached to the measurement target object. Characterized by comprising comprises a shatterproof plate.

  The invention of claim 2 is the asbestos dust generation measuring device of the invention of claim 1, comprising a suction mechanism for sucking air from the gap between the scattering prevention plate and the measurement object, And it has a collection mechanism for collecting asbestos from the air sucked by the suction mechanism.

  The invention described in claim 3 is the asbestos dust generation measuring apparatus according to claim 1 or 2, wherein the surface of the anti-scattering plate is an adhesive surface capable of adhering asbestos. To do.

According to the measuring apparatus of the present invention, the measurement target part is covered with the cover, and then the intake pump performs intake from the inside through the intake mechanism through the intake pipe, whereby the air outside the cover is absorbed by the suction force of the intake pump. Is sucked into the cover through the injection pipe and sprayed to the measurement target part, and the dust is forcibly generated from the measurement target part by the jet air flow, and the total amount of dust generation is collected by the membrane filter built in the collection mechanism. Can be collected.
Therefore, by measuring the amount of asbestos collected by forced dust generation, the amount of asbestos dust from the measurement target part can be quantitatively determined in relation to the intake air amount. It is possible to quantitatively compare the amount of asbestos dust from each part by performing under the same conditions, and it is possible to estimate and grasp the presence and degree of deterioration of each part, and the result is asbestos-containing material Can be used effectively when dismantling and repairing.
Of course, the measurement site is covered with an airtight cover with a cover, and the entire amount of forced asbestos is collected by the membrane filter, so that asbestos is scattered around the measurement. It can be surely prevented, and highly accurate and safe measurement work is possible.

  In particular, in the present invention, since a small amount of asbestos is assumed to be peeled off when the cover is attached to the measurement target site in an airtight manner during measurement, a scattering prevention plate for catching the peeled asbestos should be provided. By placing, asbestos peeled off at the time of measurement can be effectively prevented from being scattered around. At that time, asbestos is more reliably prevented by sucking air from between the anti-scattering plate and the measurement object to collect asbestos, or by sticking asbestos to the surface of the anti-scattering plate. Can do.

It is a schematic block diagram of the measuring apparatus which is a reference example used as the foundation of this invention. It is a figure which shows the schematic structure of the measuring apparatus which is embodiment of this invention, and the scattering prevention board which is the component. It is a schematic block diagram of the measuring apparatus which is another reference example used as the foundation of this invention. It is a schematic block diagram of the measuring apparatus which is another reference example used as the foundation of this invention. It is a schematic block diagram of the measuring apparatus which is another reference example used as the foundation of this invention. It is a schematic block diagram of the measuring apparatus which is other embodiment of this invention. It is a schematic block diagram of the measuring apparatus which is other embodiment of this invention. It is a schematic block diagram of the measuring apparatus which is other embodiment of this invention.

Prior to the description of the asbestos dust generation measuring apparatus according to the embodiment of the present invention, a measuring apparatus that is the basis of the present invention will be described with reference to FIG. 1 as a reference example.
FIG. 1 is a schematic configuration diagram of a reference measuring apparatus as a basis of the present invention. This is because various asbestos-containing materials, for example, structural members such as steel beams having a fireproof coating with asbestos on the surface as shown in the example shown in FIG. Is a handy-type device for directly measuring the amount of air that is connected to the cover 2, the cover 2 that covers the periphery of the measurement target portion in an airtight manner, the collection mechanism 3 attached to the cover 2, and the collection mechanism 3. An intake pipe 4 for sucking air in the cover 2 through the collection mechanism 3, an intake pump 5 connected to the proximal end of the intake pipe 4, and a built-in intake pump 5 measures the intake air amount. A flow meter 6, an injection pipe 7 that is provided through the cover 2 and blows air outside the cover 2 from its distal end to the measurement target site by a suction force of the intake pump 5, and a proximal end portion of the injection pipe 7 And a collecting mechanism 8 attached to the Than is.

The cover 2 in this reference example has a short cylindrical shape with both ends being open surfaces (same diameter as the collecting mechanism 3), and the open surface on the tip side is directed toward the measurement object 1 and pushed onto the surface. It is for preventing the asbestos dust from being scattered to the surroundings at the time of measurement by covering the part to be measured by being mounted in the applied state.
Although the material of the cover 2 is appropriate, for example, a vinyl chloride material, an acrylic material, or a metal material can be suitably used. If necessary, a sealing member made of a flexible material such as silicon rubber is attached around the open end surface that is pressed against the object 1 to be measured. Even when the surface of the measuring object 1 has unevenness or unevenness, no gap is generated.

  The collection mechanism 3 attached to the open surface on the base end side of the cover 2 is provided with a membrane filter in a cylindrical holder that can be detachably attached to the open surface on the base end side of the cover 2 in an airtight manner. 3a is built in, and the membrane filter 3a can collect the entire amount of asbestos dust in the intake air. As this collection mechanism 3, for example, a known open face holder having a diameter of 25 mm can be suitably employed.

As the intake pipe 4 connected to the collection mechanism 3, for example, a hard pipe material having an inner diameter of about 6 mm can be suitably used, and an intake pump 5 is connected to the base end thereof. The intake pump 5 sucks a desired amount of air from the cover 2 through the collection mechanism 3 and the intake pipe 4 and, along with that, sucks air into the cover 2 through the injection pipe 7 and injects it to the measurement target site at a predetermined wind speed. And has a suction force necessary for that purpose.
In the illustrated example, the flow meter 6 is integrated into the intake pump 5, but the flow meter 6 may be prepared separately from the intake pump 5 and connected to the suction side or the discharge side of the intake pump 5. .

For example, a metal tube having an inner diameter of about 3 to 6 mm can be suitably used as the injection tube 7, and the injection tube 7 obliquely penetrates the side surface of the cover 2 while being inclined with respect to the axis of the cover 2, and its tip Is extended to a position in the vicinity of the open end surface of the cover 2, and as shown in the figure, when the front end of the cover 2 is pressed against the surface of the measurement object 1, the front end of the injection tube 7 is naturally brought into contact with the measurement target site. It is designed to be located in the vicinity.
The penetration portion of the injection pipe 7 with respect to the cover 2 is sealed in an airtight manner, and a collection mechanism 8 containing a membrane filter 8a similar to the above-described collection mechanism 3 is attached to the proximal end of the injection pipe 7.
As a result, when the intake pump 5 is operated, the air outside the cover 2 is cleaned through the collection mechanism 8 by the suction force and then sucked into the injection pipe 7, and the air flow is at a predetermined flow rate from the tip of the injection pipe 7. It is sprayed toward the measurement target part, and the asbestos on the surface of the measurement target part is forcibly blown off by such a jet air flow, and dust generation can be forcibly generated in the cover 2. .
The injection flow rate of the injection air flow from the injection pipe 7 may be set as appropriate. For example, when the inner diameter of the injection pipe 7 is 6 mm, the intake flow rate by the intake pump is about 3 L / min and the injection flow rate is 1.8 m. / S is preferable, and measurement in such a state is performed for about 5 minutes, and the total intake amount is preferably about 15L.

The measurement by the measuring apparatus of the reference example having the above configuration is performed by attaching the cover 2 to the measurement target portion, covering the periphery thereof in an airtight manner, and operating the intake pump 5 to suck the air in the cover 2.
As a result, as described above, the jet air flow from the jet pipe 7 is blown to the measurement target portion at a predetermined wind speed, the asbestos in the surface layer portion is blown off, a minute amount of dust is generated, and the asbestos dust scattered in the cover 2 is The air is sucked together with the air in the cover 2 by the collecting mechanism 3 and the entire amount is collected by the membrane filter 3a, and only clean air after the asbestos dust is collected is sucked by the intake pump 5 through the intake pipe 4. Exhausted outside the system.
Therefore, after the operation for a predetermined time, the operation is stopped, the collecting mechanism 3 is removed from the cover 2, the membrane filter 3a is taken out from the collecting mechanism 3, and analyzed to analyze the collected amount (that is, forcibly generate dust). Measure the asbestos dust amount). Further, the intake air amount during the operation time is measured by the flow meter 6.

  As described above, the asbestos dust amount forcibly generated from the measurement target site by the jet air flow can be directly and quantitatively obtained in association with the intake air amount (= the jet air amount). Therefore, it is possible to quantitatively compare the amount of asbestos dust from each part by performing the same measurement at each part under the same conditions. Therefore, the amount of dust generated from each part can be quantitatively compared. Therefore, the presence or absence and degree of deterioration of each part can be estimated, and the measurement results can be effectively used for disassembling and repairing asbestos-containing materials.

Of course, although asbestos is forced to generate dust, the part to be measured is covered with a cover 2 in an airtight manner, and dust is generated only inside it. The total amount of asbestos that has been forcibly generated is captured. It can be completely collected by the collecting mechanism 3 (membrane filter 3a). Further, since the same collecting mechanism 8 is provided in the injection pipe 7, not only the outside air sucked into the injection pipe 7 is naturally cleaned. In addition, asbestos dust that is forcibly generated during measurement does not inadvertently fly around the injection tube 7 and can be measured not only with high accuracy but also with safety.
Moreover, the overall configuration of the device is extremely simple and can be manufactured at a low cost by combining inexpensive general-purpose products, and since it is a small and lightweight handy type, the measurement work does not require any troublesome and complicated procedures. Even one person can easily carry out, and from the above, it is extremely effective as a tool for diagnosing the degree of deterioration of asbestos-containing materials.

In the case where asbestos is sprayed on the structural member as a fireproof coating as in the above reference example, the injection pipe 7 having an inner diameter of 6 mm is used as described above to provide about 1.8 m / s. However, the diameter of the injection tube 7 and the setting of the injection flow rate therefrom are set in consideration of the material and application of the measurement object 1, the measurement purpose, and other various conditions. What is necessary is just to set arbitrarily, especially about the injection flow velocity, for example, what is necessary is just to set freely in the range from the slight wind speed of about 0.5 m / s to the strong wind speed of about 15 m / s.
In any case, if the diameter of the injection pipe 7 and the injection flow velocity are determined, the injection air amount per unit time (= intake amount from the inside of the cover 2) is theoretically determined, and then the measurement time is determined. Thus, since the total intake air volume during measurement is determined, the measurement can be performed using only the measurement time as a parameter, and the measurement under the same conditions can be repeated as long as the measurement time is kept constant.

The reference example on which the present invention is based has been described above. Next, an embodiment of the present invention will be described with reference to FIG. The measuring apparatus of this embodiment is obtained by adding a scattering prevention plate 10 to the measuring apparatus of the reference example.
That is, in the measurement apparatus of the above reference example, when the tip of the cover 2 is pressed against the measurement object 1, it is assumed that a small amount of asbestos is peeled off from the measurement object 1, and thus the measurement apparatus of the present embodiment. Then, it is equipped with the anti-scattering plate 10 for collecting such a small amount of asbestos, so that the asbestos that has been peeled off is surely prevented from being accidentally scattered around. It is.

The scattering prevention plate 10 is, for example, a thin disc-like plate made of a transparent acrylic plate or the like, and a mounting hole 11 that can be mounted to the cover 2 and the collecting mechanism 3 at the center as shown in FIG. Is formed and is mounted in a state of being sandwiched between the cover 2 and the collecting mechanism 3. Therefore, in a state where the tip of the cover 2 is pressed against the measurement object 1, the scattering prevention plate 10 is naturally disposed at a position immediately below the periphery of the cover 2, and asbestos is peeled from the cover 2 by pressing. Even so, it falls on the scattering prevention plate 10 and can be received.
In order to reliably receive asbestos, it is preferable that the diameter of the anti-scattering plate 10 is as large as possible. However, if it is too large, it becomes heavy and inconvenient to handle, so it is realistic to set it to about 10-50 cm. Yes, it is usually sufficient. Of course, the anti-scattering plate 10 is not limited to a circular shape, and may be a square, a polygon or other shapes.

An air suction port 12 is formed at a position slightly shifted from the center of the anti-scattering plate 10, and a collection mechanism for collecting asbestos in the suction air is formed in the air suction port 12. A suction mechanism 14 having a built-in HEPA filter 13 is connected via an air hose 15 so that air is sucked between the scattering prevention plate 10 and the measurement object 1 by the suction mechanism 14. Yes.
Therefore, if the cover 2 is pressed against the measurement object 1 while the suction mechanism 14 is in operation, the asbestos that has been peeled off from the measurement target portion is falling toward the scattering prevention plate 10 or the scattering prevention plate 10. After falling down, the air sucked into the air suction port 12 together with the air sucked by the suction mechanism 14 and collected by the HEPA filter 13 can be reliably prevented from being scattered around. Yes.

  In addition to or in addition to providing the suction mechanism 14 described above, it is also preferable that the surface of the scattering prevention plate 10 is made of asbestos as an adhesive surface, and in that case, the asbestos dropped on the scattering prevention plate 10. Immediately sticks to it and can reliably prevent re-scattering from there.

Moreover, it is also preferable to raise the side wall 16 at the outer peripheral edge of the anti-scattering plate 10 as indicated by a chain line in FIG. 2, so that a gap between the measurement object 1 and the anti-scattering plate 10 is formed. It becomes a semi-enclosed space and can improve the suction effect from there, that is, the effect of preventing peeling of the asbestos peeled off, and when the measuring object 1 is inclined with respect to the horizontal or on the vertical wall surface It is also effective when performing measurements.
However, in the case where such a side wall 16 is provided, there is a concern that asbestos may be peeled off when the upper edge of the side wall 16 comes into contact with the measurement object 1. Should not be touched.

Furthermore, as long as it can catch asbestos as the material of the anti-scattering plate 10, various plate materials such as a metal plate and a resin molded plate can be arbitrarily adopted, but it is more transparent than opaque. This is preferable because the tip of the cover 2 can be seen from below during the measurement operation. In this respect, a transparent acrylic plate can be suitably used as described above.
In addition, as shown in the figure, the scattering prevention plate 10 may be formed with an insertion hole 17 for allowing the injection tube 7 to pass obliquely. Alternatively, the scattering prevention plate 10 may be replaced with such an insertion hole 17. It is also possible to form a slit 18 cut in the radial direction and pass the injection pipe 7 therethrough. In that case, the slit 18 may be closed by attaching a tape after passing through the injection pipe 7.

As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment, Of course, if it is a range which does not deviate from the summary of this invention, the cover 2 and the collection mechanisms 3 and 8, Various design changes can be made to the specifications, shapes, and dimensions of each component such as the intake pump 5, the intake pipe 4, and the injection pipe 7.
For example, in the above embodiment, the flow meter 6 for measuring the intake air amount is provided. However, when the measurement is performed under a condition where the intake air amount is fixed, the intake air amount does not necessarily need to be measured. The total 6 can be omitted.
Further, in the above embodiment, the collecting mechanism 8 is provided at the base end of the injection pipe 7, but there is no risk that the asbestos dust that has been forcibly generated will be scattered outside the cover 2 through the injection pipe 7, and around the cover 2. If the asbestos dust or other suspended matter scattered in the air is not in a state where it is sucked into the cover 2 through the injection pipe 7, the collecting mechanism 8 is not necessarily required and can be omitted.
In particular, the specific configuration of the scattering prevention plate 10 and related components (suction mechanism 14 and the like) can be changed as appropriate. For example, in the above embodiment, the scattering prevention plate 10 is sandwiched between the cover 2 and the collection mechanism 3, but the scattering prevention plate 10 is attached to the cover 2 or the collection mechanism 3, or the cover 2 or Of course, it may be formed integrally with the collecting mechanism 3.

  In order to repeat the measurement under the same conditions, not only the injection air amount and the injection flow rate are kept constant as described above, but also the distance between the tip of the injection tube 7 and the measurement target part is always kept constant. In the case where the sprayed air is blown from the oblique direction to the measurement target part as in the above embodiment, the blowing direction should not be changed every time the measurement is performed. For this purpose, it is only necessary to firmly and securely fix the mounting position and mounting angle of the injection pipe 7 with respect to the cover 2 so that the spraying distance and the spraying direction do not change each time. Measurement accuracy can be performed with no loss of measurement accuracy or reliability.

Alternatively, instead of blowing the jet air obliquely to the measurement target site as in the above embodiment, the injection pipe 7 is arranged so as to be perpendicular to the measurement target site, and the measurement target site is always It may be configured to spray from the normal direction, and the measured value in that case may be used as a standard index.
Hereinafter, configuration examples in such a case will be listed.
3 is formed by forming the front end surface of the cover 2 obliquely with respect to the axis thereof in the apparatus of the reference example shown in FIG. 1, and attaching the front end surface of the cover 2 to the measurement target portion in an airtight manner. The injection tube 7 is naturally arranged so as to be perpendicular to the measurement target portion. In this case, air can always be blown from the normal direction, and measurement is performed under the same conditions. Can be done.

4, the tip of the injection tube 7 in the reference example shown in FIG. 1 is bent inside the cover 2 so that the tip of the injection tube 7 is perpendicular to the site to be measured. The one shown in FIG. 5 is one in which the injection tube 7 is vertically penetrated with respect to the side surface of the cover 2 and both end portions thereof are bent at right angles respectively. It is possible to repeat measurement under certain conditions by spraying.
In the case where the injection tube 7 is bent in this way, it is conceivable that at least the bent portion is formed by a flexible tube such as a bellows tube. Also, it should be securely fixed so that the distance from the measurement target part does not change carelessly.

  Therefore, in the present invention, the configuration of the apparatus of the reference example shown in FIGS. 3 to 5 is combined with the apparatus of the embodiment shown in FIG. 2 to form the embodiment shown in FIGS. It ’s fine.

DESCRIPTION OF SYMBOLS 1 Measurement object 2 Cover 3 Collection mechanism 3a Membrane filter 4 Intake pipe 5 Intake pump 6 Flowmeter 7 Injection pipe 8 Collection mechanism 8a Membrane filter 10 Scatter prevention plate 11 Mounting hole 12 Air suction port 13 HEPA filter (collection mechanism) )
14 Suction mechanism 15 Air hose 16 Side wall 17 Insertion hole 18 Slit

Claims (3)

A device for measuring the amount of asbestos dust from a specific part of the surface of an asbestos-containing material,
A cover that covers the area to be measured in an airtight manner,
A collection mechanism that is attached to the cover in an airtight manner and sucks air in the cover and collects asbestos dust with a membrane filter;
An intake pipe connected to the collection mechanism for sucking air in the cover through the collection mechanism;
An intake pump connected to the proximal end of the intake pipe;
Provided with an injection pipe that is provided through the cover, sucks air outside the cover by the suction force of the intake pump, and sprays it from its tip to the measurement target site in an injection state;
An apparatus for measuring the amount of asbestos dust generation, comprising a scattering prevention plate for receiving asbestos peeled from the vicinity of the measurement target portion when the cover is attached to the measurement target and preventing the scattering. . The asbestos dust generation measuring device according to claim 1,
Provided with a suction mechanism for sucking air from the gap between the scattering prevention plate and the object to be measured, and a collecting mechanism for collecting asbestos from the air sucked by the suction mechanism. Asbestos dust generation measuring device. The asbestos dust generation measuring device according to claim 1 or 2,
The asbestos dust generation measuring device, characterized in that the surface of the anti-scattering plate is an adhesive surface capable of adhering asbestos.

Images