JP6390881B2 - Processing method for walls containing asbestos - Google Patents

Description

  The present invention relates to a method for treating an asbestos-containing wall that can efficiently treat a treatment material from which the asbestos-containing wall has been removed using a wet removal means such as a water jet.

  Asbestos (asbestos) has been widely used as a building material for buildings since it has excellent properties such as incombustibility, heat insulation, and sound absorption. However, asbestos has been shown to cause health hazards such as mesothelioma when inhaling dust containing it. For this reason, asbestos is not currently used as a building material.

  However, even if asbestos is no longer used as building materials, there are many buildings that use asbestos-containing building materials, and when assembling or renovating such buildings, the asbestos will not be scattered. It is required by laws and regulations to work under proper control.

Patent Document 1 discloses a method for removing sprayed asbestos and asbestos-containing sprayed rock wool so that asbestos does not scatter. That is, in this patent document 1, in order to prevent the asbestos from being scattered around the work site during the removal work of asbestos adhering to the building materials of the building, a curing process for isolating the work place and peeling the asbestos A removal method comprising a removal step to be removed and a treatment step to treat the removed asbestos and waste containing asbestos is shown.
And in the removal process in the removal method, while the asbestos adhering to the building is peeled off by the peeling means that performs direct cleaning by the mixed jet jet of compressed air and high-pressure water, the inside of the isolated curing is made into a spray state The separated asbestos and sprayed water droplets are mixed and dropped to form a mud.

JP 2007-92387 A

However, the conventional asbestos removal method has the following problems.
That is, as shown in Patent Document 1, when asbestos is removed by jetting high-pressure water, there is a drawback that large-scale and strict curing must be performed.
In addition, as shown in Patent Document 1 above, when removing asbestos in a wet environment, it is necessary to collect the treated material containing the removed asbestos and high-pressure water without leakage with vacuum or the like. There was a problem that it took. Moreover, as a post-treatment of the treatment material in which water and asbestos are mixed, a method of simply performing solid-liquid separation treatment by sedimentation separation is generally used. However, a large-capacity sedimentation basin is required and the sedimentation separation takes a long time. It had the problem that it required.
In this way, in the wet asbestos-containing wall removal method, the removal process and the treatment process of the treated material after removal can be processed efficiently and economically in a short time, and high-quality treatment is achieved in a balanced manner. There is a need for a processing method that can be used, and there is room for improvement in this regard.

  The present invention has been made in view of the above-described problems, and can remove asbestos in a wet environment and efficiently and economically treat a treatment material containing asbestos as a post-treatment in a short time. An object of the present invention is to provide a method for treating asbestos-containing walls.

  In order to achieve the above object, the method for treating an asbestos-containing wall according to the present invention is a method for treating an asbestos-containing wall for removing an asbestos-containing wall and treating an asbestos material generated by this removing step, Asbestos removal wall that removes asbestos-containing walls using wet removal means mixed with, treatment material recovery step that sucks and collects the treatment material containing asbestos removed in the asbestos removal step, and the treatment material A muddy water treatment step of separating the treatment material collected in the collection step into a solid content and moisture by solid-liquid separation treatment, and the asbestos removal step and the treatment material collection step are performed on the asbestos-containing wall. The wet removal means is a water jet equipped with an injection nozzle, and is made by injecting high-pressure water. When the asbestos-containing wall is removed and the opening side of the housing is moved in close contact with the asbestos-containing wall, and the opening port side of the housing is separated from the asbestos-containing wall, the housing is moved to the housing. The high-pressure water supply is stopped, and suction from the housing is stopped.

In the method for treating an asbestos-containing wall according to the present invention, the asbestos-containing wall is exfoliated and removed using a wet removal means, and a treatment material in which water used for the removal or removed asbestos is mixed is used. Collected by suction. And the processing material collect | recovered by the processing material collection | recovery process can be isolate | separated into the solid substance containing asbestos which can be discharged | emitted in the muddy water processing process, and can be processed.
At this time, since the removal part in the asbestos removal process and the treatment material suction part in the treatment material recovery process are performed in a housing that is in close contact with the asbestos-containing wall without any gaps, water used for removal or removal is removed. Asbestos can be prevented from splashing around. Moreover, since the water generated at the time of removal and the removed asbestos material can be reliably recovered at the removed portion, the work efficiency can be improved as compared with the case of sucking the material dropped below the work wall.
In this case, since the wet processing means is a water jet using high-pressure water, the asbestos-containing wall can be cut efficiently and in a short time. And even if it is a case where the water jet by a high pressure water is used in this way, since the asbestos containing wall can be removed within a housing | casing, scattering to the circumference | surroundings can be prevented.
Furthermore, when the opening side of the casing is separated from the asbestos-containing wall, the supply of high-pressure water to the casing is stopped and the suction from the casing is stopped.

  In the method for treating an asbestos-containing wall according to the present invention, it is preferable that the high-pressure water is generated by a high-pressure water generating vehicle that has been carried near a building having an asbestos-containing wall.

  In this case, the high-pressure water generated by the high-pressure water generation vehicle being carried near the building can be supplied to the injection nozzle disposed in the housing via, for example, a high-pressure water supply hose. .

  According to the asbestos-containing wall treatment method of the present invention, in the series of steps from the removal of asbestos-containing wall to the treatment, it becomes a treatment method in which scattering of the treatment material to the periphery is suppressed, and the periphery of the asbestos-containing wall is conventionally used. Thus, since it is not necessary to perform strict curing, it is possible to perform an efficient and economical treatment in a short time.

It is process drawing of the asbestos removal and processing material collection | recovery in the processing method of the asbestos containing wall which concerns on one Embodiment of this invention. It is process drawing of the muddy water process in the processing method of the asbestos containing wall which concerns on one Embodiment of this invention.

  Hereinafter, the processing method of the asbestos containing wall by embodiment of this invention is demonstrated using drawing. The present invention is not limited to this embodiment, and constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. .

  FIG. 1 shows an asbestos removal step / treatment material recovery step 1 including both asbestos removal and turbid water recovery in an asbestos-containing wall processing method according to an embodiment of the present invention. In FIG. 1, the asbestos-containing wall W provided vertically in the building B has a concrete wall surface coated with asbestos and a paint is coated on the asbestos coated surface. For this reason, when the paint is peeled and removed, it is removed including the base asbestos coating layer. In addition, because asbestos is included in the removed material, the removed material as waste is always handled with care from the time it is discharged until it is processed according to laws and regulations. It is treated as “specially managed industrial waste”, so-called “special pipes”. Hereinafter, each process is demonstrated in order.

(Asbestos removal process / treatment material recovery process)
First, after pre-cleaning the inside of the building B, the work place such as the work floor surface of the worker M and the lower floor surface of the work scaffold F is a plastic film that does not allow water to pass through such as a vinyl sheet (not shown). Covered. In addition, the curing by this water-impermeable film is to make it possible to easily remove water later when water is spilled. It is different from curing hermetically.

  After curing with the above-mentioned water-impermeable film, the worker M performs peeling and removal work using the cutting machine 2 (wet removal means). The work of the worker M is performed while wearing protective equipment such as a mask suitable for handling special pipes. The cutting machine 2 used by the worker M has a water jet equipped with an injection nozzle as a cutting mechanism, and a known suction recovery type handy type cutting machine having a suction part is used. This cutting machine 2 has a bowl-shaped or bottomed cylindrical casing having a size and weight that can be held by the worker M, and a state in which the open port side of the casing is in close contact with the asbestos-containing wall W It is configured to be able to move with.

  High-pressure water generated by the high-pressure water generation vehicle 3 being carried near the building B is supplied to the injection nozzle (not shown) disposed in the housing of the cutting machine 2 via the high-pressure water supply hose 3a. It is configured to be. Further, the inside of the casing of the cutting machine 2 is connected via a suction hose 4a and a vacuum car 4 being carried near the building B. Further, a safety selector 5 is provided in the middle of the high-pressure water supply hose 3a and the suction hose 4a. When the open side of the housing is separated from the asbestos-containing wall W, the supply of high-pressure water to the housing is stopped. In addition, the suction from the inside of the housing is stopped.

  The cutting machine 2 having the above configuration can peel the paint (treatment material) containing asbestos in a portion facing the opening surface of the housing with the high-pressure water supplied into the housing, and the peeled off The paint containing asbestos is sucked from the inside of the casing and collected in the vacuum car 4. Therefore, when removing the paint containing asbestos using this cutting machine 2, the work can be performed without leakage of the paint containing asbestos that has been subjected to high pressure and water separation from the inside of the casing of the cutting machine 2.

  After peeling of the paint containing asbestos is completed, post-cleaning is performed after the equipment such as scaffolding F is removed. Thereafter, the building B is again coated with a new paint or disassembled as necessary.

(Muddy water treatment process)
Next, it demonstrates using the muddy water processing process figure in the processing method of the asbestos containing wall based on one Embodiment of this invention of FIG. This muddy water treatment process is provided in a predetermined treatment center that is distant from the building B, and is composed of a roughing treatment process 10 at the front stage and a coagulation separation process 20 at the rear stage. Hereinafter, it demonstrates in order.

(Roughing process)
The roughing treatment process 10 includes a vessel tank 11 that receives muddy water containing asbestos and paint collected by the vacuum car 4 (see FIG. 1) of the asbestos removal / treatment material collection process 1 described above, and a screen processing unit 12. It is configured.

  The vessel tank 11 has a capacity that is greater than the capacity of one vacuum car 4 and can withstand a plurality of peeling / removal work sites. And the muddy water in this vessel tank 11 is comprised so that it can supply to the screen process part 12 via the pump 11a.

  The screen processing unit 12 includes a water receiving tank 12a, a screen 12b, a solid storage tank 12c, and a filtered water tank 12d.

  The water receiving tank 12a is configured to receive muddy water from the vessel tank 11 side, and is configured to uniformly supply muddy water on the screen 12b.

  The screen 12b is composed of a screen having a predetermined opening. As the screen 12b, a well-known solid-liquid separation means having a predetermined opening such as a filter cloth or a bar screen that is widely used in various fields such as the water treatment field and the food processing field can be used.

  The solid matter storage tank 12c is configured so that solid matter that has not been filtered by the screen 12b, that is, solid matter containing asbestos and paint, is received from the screen 12b. In addition, the solid matter in the solid matter storage tank 12c is subjected to processing suitable for special pipes by bagging or the like in a double bag.

  The filtered water tank 12d is configured to receive filtered water that has passed through the screen 12b. Since the filtered water contains suspended solids of asbestos and paint that have passed through the openings of the screen 12b, the filtered water in the filtered water tank 12d is sent to the next coagulation separation step 20 through the pump 12e. It is comprised so that.

(Aggregation and separation process)
The agglomeration and separation step 20 includes a raw water tank 21, a mixing and agitation agglomeration tank 22, an agglomeration reaction device 23, a cyclone solid-liquid separation tank 24, a slit-type solid substance separator 25, a treated water tank 26, and a solid substance storage tank 27. And a neutralizing device 28.

  The raw water tank 21 is configured to receive the filtered water from the filtered water tank 12d of the roughing treatment step 10 as raw water. And it is comprised so that the received raw | natural water, ie, the raw | natural water containing the asbestos and the suspended solid of a coating material, can be sent to the mixing stirring coagulation tank 22 via the pump 21a.

  The mixing and agglomerating tank 22 has a predetermined volume so that raw water received from the raw water tank 21 and a predetermined aggregating agent such as an inorganic aggregating agent injected from the aggregating agent injector 22a can be mixed and agitated. And configured to generate a flocculation of suspended solids of asbestos and paint contained in the raw water. The raw water flocked in the mixing and stirring coagulation tank 22 is configured to be supplied to the coagulation reaction device 23 via the pump 22b. In addition, the flocculant used in this mixing and stirring flocculant tank 22 is appropriately selected depending on the properties of the suspended solid contained in the raw water.

  The agglomeration reaction device 23 is constituted by a pipe-type agglomeration reaction device, and is configured to promote flocking of suspended solids of asbestos and paint in the middle of flowing in the pipe. The downstream side of the agglomeration reaction device 23 is configured to be connected to a cyclone solid-liquid separation tank 24.

  The cyclone solid-liquid separation tank 24 is configured by providing an inner cylinder 24a inside, as in the known cyclone-type solid / liquid separation tank. The raw water containing the flock is configured to be supplied. The solid matter separated from the lower part of the cyclone solid-liquid separation tank 24 and the floating matter (scum) floating in the inner cylinder 24a are discharged to the slit-type solid matter separator 25. Moreover, the overflow water which flowed out to the overflow tank 24b provided in the upper part of the cyclone solid-liquid separation tank 24 is comprised so that it may discharge | emit to the treated water tank 26. FIG.

  The slit-type solid material separator 25 is configured by arranging a plurality of ellipsoidal bodies so as to be rotatable in the horizontal direction, and receives the solid matter from the cyclone solid-liquid separation tank 24 on the ellipsoidal bodies. It is configured to be able to. And this slit type solid substance separator 25 is comprised so that the water | moisture content contained in a solid substance may be dropped and isolate | separated from the clearance gap which exists between mutually adjacent ellipsoids, and the solid substance which isolate | separated the water | moisture content Is moved in one direction on the ellipsoid (right direction in the illustrated example) and discharged to the solid storage tank 27. Moreover, the water | moisture content isolate | separated with the slit-type solid substance separator 25 is returned to the aggregation reaction apparatus 23, and is comprised so that it may process. Instead of the slit-type solid separator 25, other types of solid-type separators such as a screw-type solid-type separator that lifts solids with a rotary screw and performs solid-liquid separation may be used.

  The treated water tank 26 has a predetermined capacity. And the sensor 28a of the neutralization apparatus 28 is provided in the treated water tank 26, and it is comprised so that the pH of the treated water in the treated water tank 26 can be detected. Further, the treated water in the treated water tank 26 is treated to the standard that can be discharged because it is neutralized as will be described later. The treated water in the treated water tank 26 can also be used as raw water for the high-pressure water generator 3.

  The solid material storage tank 27 has a predetermined capacity and is configured to receive the solid material from the slit type solid material separator 25. And since this solid substance contains asbestos, the process suitable for a special pipe thing is made like the solid substance in the solid substance storage tank 12c of the roughing process step 10.

The neutralization device 28 is configured so that a detection signal of the pH of the treated water can be input by a sensor 28a provided in the treated water tank 26, and the cyclone solid-liquid separation tank is based on the input detection signal. The neutralizing agent can be injected into the 24 inner cylinders 24a.
Therefore, the quality of the treated water discharged from the cyclone solid-liquid separation tank 24 to the treated water tank 26 is adjusted to a pH that satisfies the discharge standard.

Next, the operation and effect of the method for treating an asbestos-containing wall having the above-described configuration will be described in detail based on the drawings.
As shown in FIG. 1, the processing method of the asbestos containing wall which consists of the said structure was used for the removal while the asbestos containing wall W was exfoliated and removed by wet using the cutting machine 2 provided with the water jet. The treatment material mixed with water and removed asbestos is collected by suction. And the processing material collect | recovered by the processing material collection | recovery process can be isolate | separated into the solid substance containing asbestos which can be discharged | emitted in the muddy water processing process, and can be processed.

At this time, since the removal part in the asbestos removal process and the treatment material suction part in the treatment material recovery process are performed in the casing of the cutting machine 2 that is in close contact with the asbestos-containing wall W without gaps, they are used for removal. Can be prevented from splashing around the water and asbestos to be removed.
Moreover, since the water generated at the time of removal and the removed asbestos material can be reliably recovered at the removed portion, the work efficiency can be improved as compared with the case of sucking the material dropped below the work wall.

Moreover, in this Embodiment, since the cutting machine 2 (wet processing means) is a water jet using high-pressure water, it becomes possible to cut the asbestos-containing wall W efficiently in a short time. And even if it is a case where the water jet by a high pressure water is used in this way, since the asbestos containing wall W can be removed within a housing | casing, scattering to the circumference | surroundings can be prevented.
And since it becomes the method of using the handy type suction collection type cutting machine 2, there exists an advantage that an operator can work easily by holding a cutting machine by hand.

Moreover, in this Embodiment, since the solid substance is coagulated and separated from a processing material, it can process easily to such an extent that treated water can be discharged.
Furthermore, as shown in FIG. 2, since the roughing treatment process 10 using the screen 12b is used, it is possible to reduce the load of the agglomeration separation process 20 corresponding to the subsequent stage and to perform high-quality treatment. .

  In the above-described method for treating an asbestos-containing wall, the rough removal treatment step 10 using the screen 12b is provided before the aggregation separation step 20, but the rough removal treatment step 10 may be omitted. However, when this roughing treatment step 10 is used, it is possible to obtain an effect of reducing the load on the subsequent agglomeration separation step 20.

  As described above, according to the asbestos-containing wall processing method according to the present embodiment, in the series of steps from the removal of the asbestos-containing wall W to the processing, it becomes a processing method in which scattering of the processing material around is suppressed, Since it is no longer necessary to carefully cure the periphery of the asbestos-containing wall W as in the prior art, efficient and economical treatment can be performed in a short time.

  As mentioned above, although preferred embodiment of the processing method of the asbestos containing wall of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above-described example, the cutting machine 2 is provided with a water jet that ejects high-pressure water into the housing and a suction recovery type that sucks the ejected water. This type of cutting machine can be used. In any case, the asbestos-containing wall can be removed and removed in a wet environment, and it can be adopted if it is based on a wet removal means mixed with water in a format that can suck muddy water containing the solid matter that has been peeled and removed. it can.

  Moreover, in the above-mentioned example, although the asbestos containing wall W was made into the wall surface of the building B, it may exist in the object containing asbestos provided in the building. For example, asbestos pipes such as those used in chimneys, drain pipes, irrigation water pipes, etc. in a bathtub in a building can be applied.

B Building W Asbestos-containing wall M Worker F Scaffolding 1 Asbestos removal process / treatment material recovery process 2 Cutting machine 3 High-pressure water generator 3a High-pressure water supply hose 4 Vacuum car 4a Suction hose 5 Safety selector 10 Roughing process 11 Vessel Tank 11a Pump 12 Screen processing part 12a Water receiving tank 12b Screen 12c Solid matter storage tank 12d Filtration water tank 12e Pump 20 Coagulation separation process 21 Raw water tank 21a Pump 22 Mixing and stirring coagulation tank 22a Coagulant injector 22b Pump 23 Coagulation reaction device 24 Cyclone solid liquid Separation tank 24a Inner cylinder 24b Overflow tank 25 Slit-type solid substance separator 26 Treated water tank 27 Solid substance storage tank 28 Neutralizer 28a Sensor

Claims (2)

An asbestos-containing wall treatment method for removing asbestos-containing walls and treating the asbestos material generated by this removal step,
An asbestos removal step of removing the asbestos-containing wall using a wet removal means mixed with water;
A treatment material recovery step of sucking and collecting the treatment material containing asbestos removed in the asbestos removal step;
A muddy water treatment step of separating the treatment material collected in the treatment material collection step into solid content and moisture by solid-liquid separation treatment;
Have
The asbestos removal step and the treatment material recovery step are performed in a housing that can be intimately contacted with the asbestos-containing wall without a gap,
The wet removal means is a water jet provided with an injection nozzle, and removes the asbestos-containing wall by injecting high-pressure water,
Move the open side of the housing in close contact with the asbestos-containing wall,
The asbestos-containing wall is characterized in that when the opening side of the casing is separated from the asbestos-containing wall, supply of high-pressure water to the casing is stopped and suction from the casing is stopped. Processing method.   The method for treating asbestos-containing walls according to claim 1, wherein the high-pressure water is generated by a high-pressure water generating vehicle that is carried near a building having asbestos-containing walls.

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