JPH01239262A - Removing and disposing method for fine fibrous substance layer such as asbestos affixed to wall surface - Google Patents

Abstract

PURPOSE:To eliminate the risk that dust of fine fiber disperses to outside a room by constituting a working room with its inside held under negative pressure, and furnishing a seal-lock chamber for operators to come in and go out of this working room. CONSTITUTION:A working room 13 is constructed in sealed condition while the asbestos fiber layer part as object attached to the internal wall surface is exposed, and a seal-lock chamber 15 is arranged at the entrance/exit to/from this room. One side of this room 13 is in communication with a neg. pressure dust collector 16 with a blower, etc., equipped with filter, and a filter 17 is furnished at the exhaust part of this dust collector 16. The seal-lock chamber 15 consists of an air lock part 15a, a water shower part 15b, and an air lock part 15c and is equipped with an entrance/exit 15d at the air lock part 15c. Changing clothes can be made in an asbestos guard service car 21.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for removing and disposing of layers of fine fibrous materials such as asbestos and rock wool attached to internal walls of buildings. More specifically, a fine fibrous material layer attached to the internal wall surface of a building, especially a layer of fine asbestos fibers, is used for the purpose of imparting insulation, moisture, nonflammability, sound absorption, etc. to the internal wall surface. Improved method for peeling off and disposing of asbestos Ml fibrous layers or rock wool fibrous layers of a similar form, which are formed by spraying them together with adhesive mortar cement, etc. This is related to.

[Conventional technology]

Generally, this kind of fine fibrous material as.

Asbestos fiber, which is a mineral-based natural fiber, and rock wool, which is a mineral-based artificial fiber (hereinafter, each of these fibers has similar characteristics, so in this case, the explanation will not be complicated). (In order to avoid this, I will discuss this on behalf of asbestos fiber.) In the 1950s, when new construction materials suitable for various uses were not available as interior materials for buildings as they are today, 4
In the 2000s, due to its own properties such as heat insulation, nonflammability, sound absorption, and bulkiness, it was used for building dyed buildings, especially large and large buildings of public use. It has been widely used for internal walls of large-scale buildings.

However, asbestos Ni attached to the internal walls of this building
Regarding the first layer, the date and time from the time of construction, that is,
Along with its aging, the surrounding environment to which it is exposed,
In addition, it has recently been found that this asbestos fiber layer has poor weather resistance due to the service life of mortar cement used as an adhesive. Deterioration due to this aging.

rfy, as it ages, it may peel off and flake off in a natural state and be scattered into the indoor air. It has been confirmed that even if it is a small amount, it is relatively easily liberated and floats up in the air as fine dust, and when you breathe this floating dust on a regular basis, It has been pointed out that there is a risk of causing undesirable damage to human health, for example, that there is a risk of inducing harmful older cancers, and as a countermeasure to prevent iL, this asbestos fiber layer was removed from the wall surface. In addition to forcibly peeling it off, removing it, and disposing of it, it was necessary to replace it with other surface coating materials that had similar properties and were not likely to turn into dust over time. .

When forcibly peeling or removing the asbestos fiber layer from the wall surface, the asbestos fiber layer itself has already become weakened or is in the process of becoming weakened due to aging, etc. Along with the impact that is applied, a large amount of dust is generated and suspended in the air, and the size of this dust itself is extremely fine (approximately 0.03 to IOμm). In S, workers can inhale this dust or get it on their skin, which can be harmful to their health, and effective measures to prevent this are desired. Appropriate measures are also desired for the disposal of materials in order to prevent pollution.

Therefore, as one of the safety measures for peeling and removing this asbestos fiber layer, in the conventional case 1, for example, JP-A-62-1
There is a method disclosed in Japanese Patent No. 78659.

In other words, this conventional method involves sufficiently injecting or spraying a nonionic surfactant containing an octinol derivative as a main component into the asbestos fiber layer as a so-called wetting agent during peeling and removal. The layer itself is moistened and maintained in its original shape so that it cannot be blown away, and in this state, an operator manually removes it using a scraper or the like.

It is designed to be scraped onto the floor before being disposed of.

(Problem to be Solved by the Invention) However, in the case of the conventional method described above, the target asbestos fiber layer is moistened in advance during peeling and removal, and therefore, during the removal work, fine fiber pieces are On the one hand, it is possible to avoid the scattering of dust, but on the other hand, the work itself of injecting or spraying a wetting agent to the asbestos fiber layer, which has become so weakened that it requires peeling and removal, , this asbestos fiber layer has already been unnecessarily subjected to undesirable stimuli such as vibrations and shocks, and at this point the same dust is scattered, causing not only primary pollution indoors but also escaping outdoors and causing secondary pollution. On the other hand, when scraping with a scraper or the like, even if the wetted asbestos fiber layer can be roughly peeled off, since it is wetted, it is more likely to cause residue, and it may cause the asbestos fiber layer to be removed again. Finishing must be done with a brush, etc. Furthermore, collecting and removing asbestos fibers scraped off the floor surface is time-consuming, and there are various problems in disposing of the removed waste externally. In any case, workers could not be practically completely protected from the dangers posed by this type of fine fibrous material.

Therefore, in view of the above-mentioned problems in the prior art, the object of the present invention is to create a layer of fine fibrous material using asbestos, rock wool, etc. attached to the internal wall surface of a building. To enable safe, easy, and efficient stripping and removal of grass without causing secondary pollution or exposing workers to hazardous conditions, and to properly dispose of removed waste. Made it possible to dispose of it. It is an object of the present invention to provide a method for removing and disposing of a layer of fine fibrous material such as asbestos attached to this type of wall surface.

(Means for Solving the Problems) In order to achieve the above object, a method for removing and disposing of a layer of fine fibrous material such as asbestos attached to a wall surface according to the present invention is provided. Then, the asbestos fiber layer was peeled off and removed, and the work was done in a system that was essentially sealed from the outside, including the work style of the workers and the transport of the removed asbestos fibers. It is something.

That is, the present invention provides a method for peeling off, removing, and disposing of a layer of fine fibrous material such as asbestos or rock wool attached to the inner wall of a building, the method comprising: The interior of the room, including the inner wall portions that have been removed, is sealed except for at least the fine fibrous material layer, and a work chamber is maintained under negative pressure, and a seal-lock chamber is configured through which workers enter and exit the work chamber. In the sealing and curing process, a peeling head with a spray nozzle installed inside the hood with an open tip is used, and with the hood pressed against the fine fibrous material layer, high-pressure water is sprayed from the spray nozzle. Peeling, in which the fine fibrous material layer of the target area is peeled off and removed, and the removed waste is collected by vacuum suction into a water-permeable collection bag housed in a collection tank under reduced pressure.

a waste removal process, and a waste treatment process for making the waste non-polluting and disposing of the collection bag after the collected waste is made non-polluting. This is a method for removing and disposing of layers of fine fibrous materials such as asbestos.

[For production]

Therefore, in the method for removing and disposing of a layer of fine fibrous material such as asbestos attached to a wall surface according to the present invention, the layer of fine fibrous material such as asbestos is Since the work chamber is constructed in a sealed state except for the parts and the work chamber is maintained under negative pressure, there is no risk of fine fiber dust floating in the air inside the work chamber escaping to the outside. Regarding the peeling head as a working device, high perspiration water is sprayed from the spray nozzle while the hood is pressed against the target area of the fine fibrous material layer, that is, the target area is double sealed. Therefore, the fine fibrous material layer of the target area,
It can be peeled off and removed without scattering it to the surrounding area, and the peeling head is communicated with a depressurized collection tank, and the water-permeable collection bag stored in this collection tank is
Since the waste is collected by suctioning it under reduced pressure,
In this case as well, the waste can be collected while being isolated from the outside, and the collection bag containing the waste can be easily treated to make it non-polluting and then disposed of.

(Example) The following is a first example of the method for removing and disposing of a layer of fine fibrous material such as asbestos attached to a wall surface according to the present invention.
This will be explained in detail with reference to FIGS. 9 through 9.

Figure 1 shows the main process (100
), the peeling and removal of the asbestos fiber layer, the waste collection process, the pollution-free disposal process of the collected waste, and the flow of each process, such as the various necessary management measures incidental to this. 2 is a flowchart showing an overview of

Next, we will explain the flow of each process such as stripping, removal, waste collection, non-polluting waste treatment, and various necessary management measures incidental to this, which are shown in the example method in Figure 1. \Now, in order.

Each step of the process will be described in detail, and at the same time, the outline of the systematic means used for each process will also be specifically described.

In this embodiment method, an asbestos fiber layer (numerically, indoors) is attached to an internal wall surface of a room or the like.

Or, it is often on the ceiling or upper wall in a hallway. ), and to collect and dispose of waste, the following process steps are carried out in order.

In other words, in this step, the first step is sealing and curing the interior of the room including the inner wall portion to which the asbestos fiber layer is attached (100), and the second step is peeling and removal of the asbestos fiber layer. A waste collection step (200), a third step is a pollution-free disposal treatment step (300) for the collected waste, and a fourth step is restoration of the inner wall portion after removing the asbestos fiber layer. Regeneration process (40
0) respectively.

First of all, the sealing and curing process of the first step (i.o.
In o), as an auxiliary step (+01),
As shown in Figures 2 and 3, the internal wall surface (11)
All of the target asbestos fiber layer (12) attached to (in case the attachment range of this asbestos fiber layer (12) is relatively narrow),
Alternatively, if the asbestos fiber layer (12) is partially attached to a relatively wide area), the asbestos fiber layer (12) is left exposed on the inside and a suitable tough sheet member such as a vinyl sheet is used. Using (14), remove the outside from each wall part or part of each space in the room over a wide range that allows the worker to perform peeling and removal work inside the room. A working chamber (13) is formed by sealing the work chamber, and a seal lock chamber (15) is attached to the entrance and exit portion of the working chamber (13).

Here, regarding the sheet member (14) constituting the work room (13), its ceiling, wall, and floor surfaces,
In addition, when a part is divided by a space, a relatively thick sheet material (14a) with sufficient sheet strength is used to accommodate the space, and the floor side on which the worker steps is double-layered. A thin sheet material (14b) is used for protection. In addition, if necessary, a relatively flexible sheet material (14c) that can be peeled off may be provided in order to collect and remove the waste that has fallen due to peeling. is also one preferred form.

A negative pressure dust collector (I6), such as a blower with a filter, is connected from the outside to the negative side of the working chamber (13), and suction from this negative pressure dust collector (16) is used during work. The room is constantly maintained at a negative pressure lower than atmospheric pressure,
The air containing dust can be prevented from escaping from the room to the outside, and at the same time, the dust in the air sucked from the room to generate negative pressure can be filtered and collected.
Furthermore, just to be sure, a filter (17) is installed even on the side of the intake air outlet to prevent dust from being present in the exhaust air. The negative pressure sensor (19) arranged in the room and the negative pressure detector (I8) connected to the negative pressure sensor (I8) on the outside allow the indoor negative pressure to be monitored and managed on the outside. In this case, the blower of the negative pressure dust collector (16) is automatically controlled by the detection force of the negative pressure detector (18);
In other words, it does not prevent the inside of the work chamber (13) from being controlled and maintained under a predetermined negative pressure at all times.

In addition, the seal lock chamber (15) includes, from the work chamber (13) side, an air lock portion (15a), a portion of the water shower (15b), and an air lock portion (15).
c) are constructed in sequence, and the final aerodynamic part (15c) is constructed.
An inlet/outlet (15d) is provided in the water shower, and a drainage filter (20) is provided for the drainage from a portion of the water shower (15b) to remove dust that is washed away.

Therefore, with this configuration, the target asbestos fiber layer (12
) inside the working chamber (13) exposed.

During the entire period of removal work, maintain the required level of negative pressure to prevent dust generated during the work from escaping to the outside, even if the sheet member (14) is partially torn. At the same time, the exposed asbestos fiber layer (
The parts other than 12) can be covered and cured with the sheet member (14) to prevent them from being accidentally damaged.

In addition, for stripping and removal work, workers wearing designated protective work clothes and protective masks must be in the seal lock room (
15) from the entrance/exit (15d) of the aero vine section (15c).
), a part of the quarter shower (15b), and the aerostat section (15a) to enter the work room (I3) directly, and when leaving the room after finishing the work, enter the aerospace section (+5a). After going through the water shower, part of the water shower (15b
), thoroughly wash away the dust that has adhered to protective work clothes and protective masks during work, and then exit the room through the airlock section (15c) and take the dust outside, creating a cause of secondary pollution. In addition, changing into normal clothes can be done in a separately prepared asbestos guard service car (21) to further ensure the safety of both workers. Strictly control the export of dust.

), the above-mentioned asbestos guard service car (21
) As an example, as shown in Fig. 4, there is a locker room (22) with lockers (22a) arranged inside it from the entrance/exit side to the outside, and a part of the locker room (22a) with a flush toilet (23a).
), a changing room (24) with a work clothes disposal box (24a), and an air shower room (25) on the entrance/exit side to the working area. It may be. In addition, in Figure 4, (2
6) is the LP gas tank room, (27) is the water storage tank (27
a), water supply unit (27b), hot water supply unit (27
C), a machine room equipped with a water unit (27d), an air shower unit (27e), etc. is shown in each case.

Therefore, in this sealing and curing process (ioo), in the auxiliary step (101), the working chamber (13
), and prior to peeling and removal of the target asbestos fiber layer (12), a pre-work monitoring auxiliary step (
+02), on -day, the work environment before work in the same work room (13), in other words, the floating rate of asbestos fiber dust was measured and understood, and the work environment was monitored.
It is preferable to obtain the measured values as report materials.

This is followed by the above-described second step of stripping, removal, and waste collection step (200), and the third step of making the collected waste non-polluting waste treatment step (300).
), a device system as shown in FIG. 5 is prepared.

That is, in this apparatus system shown in FIG. 5, the peeling and removing means applied to the auxiliary step (201) in the peeling and removing process (200) can be carried and operated by the operator, such as a hand-held type, for example. It has a peeling head (31) as a 9 working tool, and this peeling head (
31) is provided with a cylindrical part (31a) for receiving peeled and removed waste on its base end side, and a trumpet-shaped hood part (32) with an open tip on its distal end side. The injection nozzle (33) is rotatably supported inside the injection nozzle (33), and the injection nozzle (33) is provided with an injection port (33a).
As will be described later, the injection port (33a) is arranged eccentrically.
The target portion of the asbestos fiber layer (I2) can be reliably peeled off and removed by high-pressure water jetted from the asbestos fiber layer (I2).

And according to this auxiliary step (201)! lJ away.

For the removal means, first, in an auxiliary step (202), a means of supplying high-pressure water having a predetermined pressure is taken, and then, in an auxiliary step (2t13), a suction means with a predetermined reduced pressure is taken. For both of these means, the respective equipment configurations for generating high-pressure water and reduced pressure are respectively mounted on the work service car (67) 1.

First, as the high-pressure water supply means in the former auxiliary step (202), the injection nozzle (3) of the peeling head (31) is used.
3) is connected to the discharge side of the water supply pump (41) by a flexible hose (42), and this water supply pump (4
1) into the water storage tank (43) and the strainer (4).
4), and this water supply pump (41
) as appropriate for driving a car engine, electric motor, etc. 1j9.
(45), and high-pressure water from the water supply pump (4I) is supplied to the eccentric injection port (3:3a) of the injection nozzle (33) for injection.

Therefore, in this case, as shown in FIG.
is pressed against each part of the target asbestos fiber layer (12), that is, in a sealed working chamber (13) with double sealing by this hood part (32), By injecting high-pressure water obtained by the water supply pump (41) from the eccentric injection port (33a) of the injection nozzle (33), the injection nozzle (33) rotates using the injection force, and the corresponding part Asbestos fiber layer (1
2), and then thoroughly moisturizes all the corresponding parts of the asbestos fiber layer (12), thoroughly and effectively preventing the diffusion and release of dust into the atmosphere outside the head. It can be reliably and easily peeled off and removed, and the waste thus peeled off and removed is removed from the cylindrical part (31) of the peeling head (31) together with the water component that moistens it.
The inside of the cylindrical part (31a), which is received in the cylindrical part (31a) and is placed in a reduced pressure atmosphere as described below, can be substantially separated from the hood part (32), and this hood part (32) does not interfere with the pressurized atmosphere for peeling and removal using high-pressure water. In addition, when it is necessary to use a wetting agent, a cleaning agent, a concentration suppressing agent, etc. in conjunction with this peeling and removal operation, use these in the water supply tank (43).
All you have to do is mix them inside.

In addition, as a decompression suction means in the latter auxiliary step (203), the suction side is commonly connected to the suction pipe line of the water supply pump (41), and the discharge side is connected to the water storage tank (41).
43) connected to the venturi nozzle (52a) in the venturi tube (52) provided at the upper part of the venturi tube (52).
For example, it has a suction pump (51) coaxially driven by the drive source (45), and this suction pump (51
), the negative pressure generated within the Venturi tube (52) is cleverly utilized by jetting out high-pressure water from the Venturi nozzle (52a).

That is, in this case, the cylindrical part (:1Ia) of the peeling head (31) is connected to a closed recovery tank (53) that can be opened and closed by a suction hose (54), and this recovery tank (53) (56) and (56) respectively.
), this S is connected to the negative pressure generating section in the Venturi tube (52) via a safety tank (55) which acts as a reduced pressure receiver to obtain an average degree of reduced pressure, and the recovery Inside the tank (53), a collection bag (57), in this case a collection bag (57) made of a tough material that can only pass through the liquid, is accommodated so that it can be attached to the safety tank (55). A pressure sensor (55a) is built inside to detect and output the internal pressure.

Therefore, in this case, after the above-described peeling and removal operation is started, the suction pump (51) is driven by the drive source (45), and the Venturi nozzle (52) of the Venturi tube (52) is driven.
By jetting out pressurized water from a), the Venturi tube (5
2) Negative pressure is generated inside the tank, and this generated negative pressure reduces the pressure inside the safety tank (55) and, by extension, the recovery tank (53). Accordingly, the cylindrical part (
The water-containing waste received in 31a) is collected in a collection bag (57) housed in a collection tank (53) due to the suction effect caused by this reduced pressure. At the same time, through this collection bag (57), only the water contained in the waste is separated into the collection tank (53),
The waste collected in the collection bag (57) in this way is sufficiently compressed and solidified, and the separated water passes through the safety tank (55) and the Venturi tube (57).
2) is returned to the water storage tank (43) and reused.
Minimize water usage.

Then, this peeling, removal, and waste recovery process (2
00), the asbestos fiber layer (12
), the supply of high-pressure water to the stripping head (31) by a high-pressure water supply means in an auxiliary step (202), and the collection of waste by a reduced-pressure suction means in an auxiliary step (203). During the continuing work in the same work room (1), in the work monitoring assistance step (204),
3) In other words, the floating rate of asbestos fiber dust during work and the floating rate of asbestos fiber dust around the outside of the same working room (13) are measured and understood, respectively. It is preferable to monitor the working environment and the radiation to the outside, and to obtain the respective measured values as report materials.

Therefore, in the pollution-free disposal process (300) of the collected waste, in the auxiliary step (:101), the waste collected is placed in the collection bag (57) in the collection tank (53). When a fixed amount is reached and the effect of the vacuum suction force on the peeling head (31) decreases, this state is detected by a pressure sensor (55a) built in the safety tank (55).
The detection force controls the drive source (45) to stop, and after waiting for this stop, the recovery tank (53)
), that is, the collection bag (57) in which the waste has been solidified and collected, is taken out to the outside, and a suitable outer cover 2 is further applied to the taken-out collection bag (57), for example, After carrying out pollution-free treatment by covering with another outer bag (not shown), etc., as shown in the auxiliary step (302), it is processed into concrete, for example, in accordance with legal regulations such as waste disposal regulations. The container is then sealed and disposed of appropriately in an auxiliary step (302).

Furthermore, in the configuration of the device system shown in FIG. 6,
Pressure sensor (5) built into the safety tank (55)
5a) detects that the waste collected in the collection bag (57) has reached a predetermined amount as described above, and turns on the drive source (45).
In addition to controlling the drive of the
) For example, abnormal pressure caused by clogging of each channel is detected, and the drive source (45) is similarly stopped and the equipment configuration is destroyed due to abnormal pressure within the system. prevent the danger of And also the water pump (
A pressure regulating valve (5) is provided between the discharge side of the suction pump (51) and the water storage tank (43), and between the discharge side of the suction pump (51) and the water storage tank (43), each of which can be set to a predetermined pressure.
8) and (59) are connected, and the pressure set by these pressure regulating valves (58) and (59) controls the supply pressure of high-pressure water to the peeling head (31) and the recovery tank (53). Adjust the degree of decompression to the optimum level. Furthermore, water is supplied to the water storage tank (43) through a water supply pipe (60).
The water tank (43) is drained by a water supply valve (61) whose opening and closing are controlled by a liquid level sensor (62).
5), and water above a predetermined liquid level and dust floating on the water surface are similarly discharged to the drain pipe (65) via the discharge pipe (64). In the figure, (66) is a hose drum that winds up the hose (44).

An example of the form of the work service car (67) on which each device in this device system is mounted may be as shown in FIG. 7.

That is, since the waste that has been peeled off and removed in one or more of the above methods is recovered in a substantially closed system, there is no possibility that the waste will escape to the outside atmosphere.

Since there is no release, safety can be effectively and fully ensured.

Then, this peeling, removal, and waste recovery process (2
00), the asbestos fiber layer (12) is completely removed by measuring and understanding the floating rate of asbestos fiber dust in the work chamber (13) in the post-work monitoring auxiliary step (205). It is preferable to confirm whether or not the measurement value has been measured, and obtain the measured value as report material in the same way.

Incidentally, Figure 8 shows the process flow from peeling off the asbestos fiber layer to the pollution-free treatment of the waste in this example method, and the flow of the same process in a conventional general method. We will summarize and compare them with each other.

In Fig. 8, in the conventional method, peeling and removal of the asbestos fiber layer (I) → collection and collection of waste M(n) → bagging of waste (III) → double bagging ( rV) → Carrying out bagged waste (V) → Temporary storage of bagged waste (Vl)
Among these steps, steps (1) to ([1) are the most dangerous, and steps (I) to ([1]) are the most dangerous.
V) There is an extremely large amount of asbestos fiber scattering up to the process. On the other hand, in the case of the method of this embodiment, as described above, in a work room isolated from the outside under negative pressure, the individual removed portions of the asbestos fiber layer are peeled and removed by a closed system → by the same closed system. Since the process goes through the steps of bagging the waste, which also serves as waste collection, and then processing the bagged waste to make it non-polluting, there is no chance of asbestos fibers scattering or any other danger.

Next, in the 1M old regeneration step (400) of the fourth step, the auxiliary step (
After the asbestos fiber layer (12) has been removed in step 401), the inner wall surface (11) is coated with paint or the like by airless spraying to form a coating layer (71). Even if some remains, it can be fixed in that position by this coating layer (71).Subsequently, on the coating layer (71), insulation, heat retention, nonflammability, sound absorption, etc. are applied as appropriate. They are regenerated by applying a surface liquid material (72) that has characteristics such as elasticity and is not likely to turn into dust over time.

A specific example in which this invention is applied will now be described. In this specific example, for a building with an asbestos fiber layer adhered to the internal wall surface, the concentration of suspended dust was measured before, during, and after construction work to remove the asbestos fiber layer. It is something.

1. Target building sports center 2, measurement points (and measurement date and time, weather) The measurement points were the interior of the room where asbestos removal work was being carried out, and the vicinity of the north, south, east, and south site boundaries as the surrounding environment.

2-a construction ff1T, (December 19th 12:00-1
8:35 (Sunny weather) IF pool, 2nd floor stairs, 3rd floor office, 3rd floor waiting room.

4F training room, 5F locker room, 5F jazz dance room, environment (stairs), environment (center of road beside site),
Environment (next to the office), Environment (next to the small pool),
All 11 locations 2-b under construction 1. (December 23rd 13:03-17:10 Clear skies) Construction entrance/exit, environment (north side), environment (south side), environment (west side), environment (east side) Total of 5 locations 6 or more 2-c under construction r1. (December 24th 13:
01-16:20 Clear weather) Construction entrance/exit, environment (north side), environment (south side), environment (west side), environment (east side) 5 locations 9 or above 2-d under construction III, (December 25th 14:5
8-17:55 Clear skies) Exhaust outlet exit, all 1 location 2-e construction? &, (tFebruary 30th 10:40~
16:04 Clear weather) 1F pool, IF stairs, 3F office, 4F training room, 5F jazz dance room, environment (north side).

Environment (south side), environment (west side), environment (east side).

Measurement method *3-a Sampling A membrane filter (diameter 47 mm, pore size 0.8 μDI) was used to collect asbestos dust in the relevant room, and a low-volume air sampler was used to collect asbestos dust. held a gathering.

Suction speed 1-25 It/ff1in Suction time
15 minutes to 4 hours Measurement location Installed approximately 1.5m above the floor (ground level) *3-b Measurement Asbestos dust was confirmed and measured using a phase contrast microscope at 400x magnification.

Equipment used: Olympus MODEL-EH Sampling and measurement methods were based on the following.

・Environmental Agency Air Quality Conservation Bureau Asbestos Monitoring Manual ・Ministry of Labor Safety and Health Department Work Environment Measurement Handbook Others *3-c Meteorological Measurement Applicable During the measurement of dust concentration in the room, the temperature and humidity in the same room and the wind direction in the surrounding environment are measured. , wind speed measurements were carried out.

Equipment used: Temperature, humidity Assmann ventilation hygrometer - Wind direction, wind speed Upper ram type portable anemometer 4, measurement results The results of measuring the concentration of asbestos dust at each measurement point are shown in Tables 1 to 5 below.

Before construction.

The asbestos dust concentration in the room before construction was 5.
The dust concentration is 2.2 to 18:1 fibers/IL, and among the measurement points, the one where the dust concentration is extremely high is 183 fibers/IL in the 3rd floor office! , and 136 fibers/j in the 5th floor Jiyaz dance room! Met.

In addition, the asbestos dust concentration in the surrounding environment at this time is
It was 1.72 to 2.10 fibers/Jl.

Under construction.

During construction, the asbestos dust concentration on the first day was 2.30 fibers/It at the work entrance and exit, and 1.51 to 2.59 fibers/It in the surrounding environment at this time.
/JZ was.

During construction, the asbestos dust concentration on the second day was 2.53 fibers/1 at the work entrance and exit, and at this time, the concentration in the surrounding environment was 1.30 to 2.68 fibers/1.
It was J2.

The asbestos dust concentration at the exhaust outlet during construction was 0.3.
7 fibers/IL.

After construction.

The asbestos dust concentration in the room after construction was 0.
．． 25 to 0.81 fibers/l, which has significantly decreased overall, with the 3rd floor office, where the dust concentration was extremely high before construction, to 0.62 fibers/41, and the 5th floor jazz dance room to 0.25 fibers/42. became.

In addition, the asbestos dust concentration in the surrounding environment at this time is
It was 0.95 to 1.24 fibers/4.

Currently, there are no specific standards set for asbestos dust concentrations in the general environment in Japan, but the following standards exist for asbestos control concentrations in working environments. . Namely.

・Ministry of Labor Notification (1981, Base No. 69) 2 fibe
rs/cc (2000ffbers/Jri.

・Specified Chemical Substance Hazard Prevention Regulations 5 fibers/cc ~ 5 μm or more.

・Japan Society of Industrial Hygiene Asbestos 2 fibers/cc.

Blue asbestos 0.2 fibers/cc.

It is.

In the case of the United States, there are standards as shown below. Namely.

-ACGltl (American (:onffe
Rence of Government-mcntal In
Industrial Hygienicsjnc, )TL
V-TWA = time weight a
verage con-centration.

(Time-weighted average concentration during regular working hours of 8 hours per day, 40 hours per day) Of asbestos.

Amosite 0.5 fibers/cc.

Chrysotile 2 fibers/cc.

Crocitolite 0.2 fibers/cc.

Others 2 fibers/cc.

It is.

Therefore, when these numerical values are used as a reference (standard), the following can be said about the measurement results in the specific example of this invention described above.

A) Comparing the asbestos dust concentration in the room before and after construction and the surrounding environment at that time, the dust concentration in the room was very high before construction, but after construction, the dust concentration was higher than that in the surrounding environment. The environment deteriorates to the same level as me.

8) During construction, the asbestos dust concentration at the work entrance is maintained at the same level as that in the surrounding environment, and at this time, the asbestos dust concentration at the exhaust outlet is lower than that in the surrounding environment. It has become.

c) Tin, the asbestos dust concentration in the relevant room is approximately 1/1O of the above-mentioned control concentration at the highest point, and the surrounding environment at that time and the dust concentration during and after construction are also 1/1O of the same control concentration. loo.

It's an order of magnitude.

〔Effect of the invention〕

As described in detail in 1.2 above, according to the method of the present invention, in a method for peeling off, removing and disposing of a layer of fine fibrous material such as asbestos or rock wool attached to the inner wall of a building, The interior of the chamber, including the inner wall portion to which the fine fibrous material layer is adhered, is sealed except for at least the portion of the fine fibrous material layer to form a work chamber in which the interior is maintained under negative pressure, and no work is carried out within this work chamber. A seal lock chamber is provided for people to enter and exit, so there is no risk of fine fiber dust floating in the air in the work room escaping to the outside.
Using a peeling head with a spray nozzle inside a hood with an open tip, the hood is pressed against the target area of the fine fibrous material layer, that is, the target area is doubly sealed. Since high-pressure water is sprayed from the spray nozzle, the fine fibrous material layer in the target area is
It can be peeled off and removed extremely easily without scattering it around the cylinder, and furthermore, the waste thus removed is stored in a collection tank maintained under reduced pressure. Since the waste is collected by vacuum suction into the collection bag, it is possible to effectively collect the waste in this S while blocking the waste from the outside, and the collection bag in which the waste was collected can be easily removed. It can be treated to make it non-polluting and then disposed of.

In addition, because the sheet members that make up the work room are made of a sheet material with sufficient strength and a sheet material that doubles as protection for the floor side on which workers step, it is possible that the sheet members may be accidentally damaged during work. By arranging a relatively flexible sheet material that can be peeled off inside each of these sheet materials, it is easy to collect waste that has fallen off the floor. This work room is connected to a negative pressure dust collector that sucks the air in the room, maintains it at negative pressure, and filters dust from the sucked air, making it easy to maintain negative pressure in the room. In addition, the suction of indoor air prevents dust from being dissipated outside, and by placing a pressure sensor inside the work room and controlling the suction force of the negative pressure dust collector, it is possible to maintain a predetermined negative pressure. maintenance becomes easier.

Furthermore, by providing a cylindrical part to receive the removed waste at the base end of the stripping head and connecting this cylindrical part to a recovery tank, high-pressure water is jetted from the injection nozzle and the waste is removed. It is possible to perform depressurization and suction in a well-balanced manner, and by forming an eccentric injection port at the tip of the injection nozzle and rotatably supporting the injection nozzle,
The fine fibrous material layer can be peeled off and removed quickly and effectively by jetting high-pressure water.

Furthermore, since a safety tank that acts as a vacuum receiver is interposed in the vacuum suction system of the recovery tank, the degree of vacuum for waste recovery is added to the average of the peeling head, and 1 (
In addition, the water component of the folded waste collected in the collection bag of the collection tank can be sucked through this safety tank, which improves the drainage of waste and promotes its solidification. And inside this safety tank,
By installing a pressure sensor that detects the degree of reduced pressure, and using this pressure sensor to control the supply of high-pressure water to the stripping head and the degree of reduced pressure in the recovery tank, risks such as destruction of the equipment configuration can be reduced. You can avoid it before it happens.

Furthermore, by forming a coating layer on the internal wall surface after removing the fine fibrous substance layer, even if asbestos fibers remain on the internal wall surface, this coating layer will remove them from their positions. It has excellent features such as being able to be fixed to the surface and preventing it from scattering.

[Brief explanation of the drawing]

The attached drawings show an overview of an embodiment of the method for removing and recycling a layer of fine fibrous material such as asbestos attached to a wall surface according to the present invention, and FIG.
The sealing and curing process (+00) of the room, including the inner wall part with the miscellaneous layer attached, the peeling and removal process of asbestos fibers, the waste collection process, and the pollution-free disposal process of the collected waste and a flowchart outlining the flow of each process such as the various necessary control measures accompanying this, Figures 2 and 3 show an overview of the work room and incidental equipment in the sealing and curing process in the same method. A perspective view of the configuration and a cross-sectional view of the main parts of the work room, FIG. 4 is a plan layout diagram of an example of the guard service car, and FIGS. 5 and 6 show peeling, removal, and waste recovery in the same method. FIG. 2 is a layout configuration diagram showing an overview of the process and the equipment system in the waste pollution-free disposal process. FIG. 7 is a plan layout diagram of an example of the above-mentioned work service car; FIG. 8 is an explanatory drawing showing a comparison of the process according to the embodiment method and the conventional method; FIG. 9
The figure shows restoration after removing the asbestos fiber layer using the same method as above.
It is a sectional view showing an inner wall part in a reproduction process. (100)...Sealed! ! Raw process. (11)...
- Internal wall surface of a building, (12)... Asbestos fiber layer attached to the internal wall surface, (13)... Working room containing the asbestos fiber layer, (14)... Sheet member, ( 15)...
・Seal lock chamber, (15a)...Aero vine section,
(isb)・・・Quarter shower part, (15c)・
...Aerial section, (15d)...Work entrance,
(16)... Negative pressure dust collector, (17)... Filter filter, (18)... Negative pressure detector, (19)...
... Negative pressure sensor, (20) ... Drainage filter, (2
1) Asbestos guard service car, (22)
... Locker room, (23) ... Hot water shower room, (24) ... Changing room, (25) ... Air shower room. (200)... Stripping, removal, and waste collection process, (300)... Pollution-free waste treatment process for the collected waste. (31)...Peeling head, (31a)
...Cylindrical part of the head base, (32) ...Hood part, (33) ...Injection nozzle, (33a) ...
Injection port, (41)... Water supply pump, (43)...
・Water storage tank, (44)...Strainer, (45)
... Drive source, (51) ... Suction pump, (52
)...Venturi tube, (52a)...Venturi nozzle, (53)...Recovery tank, (54)...
・Suction hose, (55) safety tank, (55a
)...Pressure sensor, (57)...Collection bag, (5
8), (59)...pressure regulating valve, (60)...
...Water supply pipe, (61)...Water supply valve, (62)...
...Liquid level sensor, (63)...Drain valve, (64)
...Drain pipe, (65) ...Drain pipe. (400)...Restoration and regeneration process. (7I)...
Paint layer, (72)... surface coating material.

Claims (8)

[Claims] (1) A method for peeling off, removing, and disposing of a layer of fine fibrous material such as asbestos or rock wool attached to the inner wall of a building, the inner wall having the layer of fine fibrous material attached to it. Sealing and curing that constitutes a work chamber in which the interior of the room containing the parts, etc. is sealed except for at least the same fine fibrous material layer part, and the inside is kept under negative pressure, and a seal lock chamber through which workers enter and exit the work chamber. In the process, using a peeling head with a spray nozzle installed in the hood with an open tip, with the hood pressed against the fine fibrous material layer, high-pressure water is sprayed from the spray nozzle to remove the target area. Peeling and removing the fine fibrous material layer, and collecting the removed waste by suctioning it under reduced pressure into a water-permeable collection bag stored in a collection tank under reduced pressure. fine fibers such as asbestos attached to a wall surface, the method comprising: a collection step of collecting the waste; and a waste treatment step of decontaminating the collection bag in which the waste is collected and then disposing of the waste. How to remove and dispose of the sexual substance layer. (2) The sheet members constituting the work room are made of a sheet material with sufficient strength and a sheet material that double protects the floor side on which the worker steps, and as necessary, each of these sheets is 2. The method for removing and disposing of a layer of fine fibrous material such as asbestos attached to a wall surface as claimed in claim 1, characterized in that a relatively flexible sheet material that can be peeled off is arranged inside the material. (3) The work room is connected to a negative pressure dust collector that sucks the air in the room and maintains it at negative pressure, and filters the dust in the suction air, and if necessary, the pressure 2. The method for removing and disposing of a layer of fine fibrous material such as asbestos attached to a wall surface as claimed in claim 1, wherein the suction force of the negative pressure dust collector is controlled by a sensor. (4) A cylindrical part for receiving the removed waste is provided at the base end of the peeling head, and the cylindrical part is connected to a collection tank. How to remove and dispose of layers of fine fibrous materials such as asbestos. (5) The spray nozzle provided in the hood of the peeling head is rotatable, and an eccentric injection port is formed at the tip of the spray nozzle. How to remove and dispose of layers of fine fibrous materials such as asbestos. (6) A safety tank that acts as a vacuum receiver to obtain an average degree of vacuum is interposed in the vacuum suction system of the recovery tank, and the water component of the waste collected in the collection bag of the recovery tank is transferred to the safety tank. 2. The method for removing and disposing of a layer of fine fibrous material such as asbestos attached to a wall surface according to claim 1, characterized in that the layer of fine fibrous material such as asbestos attached to a wall surface is suctioned through a tank. (7) A safety tank is interposed in the vacuum suction system of the recovery tank, which acts as a vacuum receiver to obtain an average degree of vacuum, and a pressure sensor is provided in the safety tank to detect the degree of vacuum, and this pressure sensor According to
The method for removing and disposing of a layer of fine fibrous material such as asbestos attached to a wall surface according to claim 1, characterized in that the supply of high-pressure water to the stripping head and the degree of depressurization of the recovery tank can be controlled. . (8) Removal of the fine fibrous substance layer such as asbestos attached to the wall surface according to claim 1, characterized in that a coating layer is formed on the inner wall surface after the fine fibrous substance layer has been removed. ,
Disposal method.