JPH0754055B2 - Spray type asbestos dry type removal equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a spray type asbestos dry type removing apparatus, and more particularly, to an asbestos sprayed on a wall surface / ceiling of an existing building or a member coated with fireproof material. , A device for removing by a dry scraping method.

[Conventional technology]

Spraying asbestos to buildings for the purpose of sound absorption, fire resistance, heat insulation, etc. was widely performed from 1955 to 1950. Asbestos, if it is stable,
It is a material with excellent fire resistance and durability, but
Due to the damage, and for the construction work such as removal, the health of the building users and construction workers became a concern. To do this, properly grasp the degree of damage and deterioration of the sprayed asbestos and determine the appropriate treatment according to the usage conditions of the room, and in the treatment, work environment and general environment. It is important to develop a construction method that considers the above.

By the way, many companies have been trying to research and develop these technologies or have been introduced from foreign countries, but these technologies have not reached the established stage yet. Against this background, from the Japan Building Center, "Technical guidelines / figure explanation for spraying asbestos dust scattering prevention treatment of existing buildings"
However, the Association for Prevention of Industrial Accidents in the Construction Industry issued "Manuals for Preventing Exposure of Asbestos Dust during Demolition or Renovation of Buildings" in 1988, respectively, and currently follow these guideline manuals. It is being evaluated and constructed.

In the removal treatment work, which is one of the treatment methods, the removal work area is completely isolated from other portions by curing, and the negative pressure dust remover is operated. Then, the asbestos surface to be removed is sprayed with a dust scattering preventive agent made of a nonionic surfactant to make the asbestos sufficiently wet, and then the asbestos is scraped off with a squeegee stick, scraper, spatula, or the like.

[Problems to be Solved by the Invention]

Although it is possible to temporarily prevent the scattering by the wet removal work as described above, when the dust scattering prevention inhibitor does not sufficiently penetrate into asbestos or when the surface becomes dry over time. However, there is a problem that the fibers are scattered and the dust concentration in the room is increased.

Also, in the electrical room, machine room, computer room, air conditioning room, telephone exchange room, etc., when removal work must be performed while the various devices are running or the conductors are energized. There is. In such a case, the dust scattering inhibitor may be used for curing seams, pinholes,
There is a risk of infiltration due to breakage, which could cause serious accidents or failures in the equipment and electrical conductors. Therefore, it takes a few times as many man-hours as usual for curing, but it is difficult to completely prevent water leakage. Further, even in construction in which the operation of the equipment and the energization are stopped, water may leak during the construction and an accident may occur at the start of energization to restart the operation of the equipment.

If the dry method of scraping the sprayed asbestos with a scraper or a brush is adopted instead of the above-mentioned wet method, the number of fibers scattered from the sprayed asbestos immediately becomes tens of thousands to several hundreds of thousands. This value far exceeds the environmental standard, and the dust mask and the filter of the negative pressure dust remover are clogged in a short time, and the negative pressure of the filtering ability dust remover decreases, and the dust is outside the work area. There is a risk of scattering, and it is virtually impossible to work. To realize unmanned work, expensive equipment and advanced technology are required for its operation, but no such equipment has been put to practical use yet.

By the way, when purifying indoor air once polluted to tens of thousands of f (where f is a fiber), even if the negative pressure dust remover is operated and the indoor air is replaced four times per hour, the asbestos fiber concentration It has been experimentally known that it takes 150 to 300 hours to reduce the value of 1 to 100 f or less. Therefore, when the sprayed asbestos is removed by the dry method, a great amount of time is spent on the indoor air purification work. For this reason, efforts have been made to develop a removal device by the dry method, but it is still in a state where it cannot be put to practical use.

The present invention has been made in view of the above problems, and an object thereof is to realize a dry method adopted when removing sprayed asbestos by a closed system and to remove asbestos scraped from a wall surface, a ceiling, and a fireproof covering member. Fibers and dust scattered during scraping and scraping can be collected and processed without causing pollution of indoor air,
It is an object of the present invention to provide a spray type asbestos dry type removal device capable of speeding up the removal work and reducing the work cost.

[Means for Solving the Problems]

The present invention is a spray-type dry asbestos removing apparatus that achieves the above object, and is characterized by a structure including the following (a) to (c).

(A) A rotary cutter that cuts sprayed asbestos at the front end surface.

(B) A dust collection casing that covers the cutter, has a connection port to the negative pressure / dust removal device, and has a cushion cous at the tip end that abuts against the wall surface. This cushion cowl is a substantially cylindrical hollow elastic body that contracts when pressed in the axial direction.

(C) A temporary fixing device for temporarily fixing this casing to the wall surface.
The temporary fixing device is provided with, for example, a plurality of needle-like needles having a pointed tip that can advance and retract freely as a temporary fixing portion.

(D) It is more preferable to provide an outside air intake jig at the contact portion with the wall surface of the cushion cowl. The outside air intake jig covers the contact area with the wall surface of the casing and has an air intake opening, for example, a slit, a notch, etc. near the wall surface.

[Action]

The dry asbestos removing device of the present invention is a handy and portable dry removing device, in which the asbestos layer is cut by a cutter and the atmosphere in the casing is sucked by a negative pressure dust removing device. When the tip end of the casing of this device is pressed against the wall, the cushion cowls attached to the tip end of the casing shrinks, the tip of the needle is temporarily fixed to the wall, and the cutter cuts the sprayed asbestos. The cutting powder is sucked into the negative pressure dust collector and does not scatter in the air. When the pressing is further advanced, the cushion cowl further shrinks while keeping the tip end in close contact with the wall surface. The temporary fixing device also retracts as much as the progress, and the cutter further cuts the wall surface.

If an outside air intake jig is installed at the contact part with the wall surface of the cushion cowl, it is more reliable to completely suck the scattered substances generated in the contact area with the wall surface into the negative pressure dust remover by the intake air. Since it is guaranteed to be, dust is not scattered to the outside at all.

When cutting is completed and the device is pulled back, the cushion cowls extend forward, the temporary fixing part of the temporary fixing device also moves forward relatively, and when the device is pulled back further, the temporary fixing part moves from the wall surface. Since the temporary fixation is released and the tip of the cushion cowl also separates from the wall surface, the wall surface sprayed material removing head can be moved to the next removal position, and the same operation as above can be repeated.

Thus, the sprayed asbestos can be removed without dissipating dust outside the casing, and all the drawbacks of the wet method are eliminated.

〔Example〕

FIG. 2 shows (a) a longitudinal sectional view and (b) a front view of an embodiment of the present invention, and an exploded perspective view thereof is shown in FIG. The embodiment is, as shown in FIG. 1, a cutter device 10 and a casing.
20 and a temporary fixing device 30. Note that FIG. 1 also shows the outside air intake jig 40.

The cutter device 10 is composed of a rotary cutter 11 whose front end face is a cutting blade, a motor 14 which drives the rotary cutter 11, and a rod 12 which connects these. Cutter
11 is detachably connected to a rod 12, and the rod 12 is connected to a motor 14 via a coupling 13. The shape and size of the cutter are not limited, but the asbestos layer is scraped off by rotation, removed by the action of cutting, polishing or the like. The motor 14 may be fixed to the casing 21 as shown in FIG. 1, or may be a separate body to transmit power by a flexible shaft or the like to rotate the cutter 11.

The casing 20 covers the cutter 11 and collects the asbestos removed by the cutter 11 without scattering it to the outside. The casing 20 is, in the embodiment shown in FIG. 1, a deformed pipe 21 having a branch pipe 22 for connecting a vacuum hose 23,
It is composed of a cushion cowl 25 attached to its front end face. Of course, the casing 20 may have any shape as long as it has the dust collecting function.

The cushion cowse 25 covers the cutter, and when the dry removal device for sprayed asbestos is pressed against the wall surface, its front end face 26 abuts on the asbestos, and the cushion cowus 25 contracts to allow the cutter 11 to reach the asbestos surface. However, the suction space of the negative pressure dust remover is formed between the surface of the asbestos and the surface of the asbestos. Cushion cows 25 is shaped pipe 21 with fastener 27
Connected with. In FIG. 1, a mounting band 28 for mounting an outside air intake jig 40 is attached to the front end surface 26 of the cushion cowl 25. When the outside air intake jig 40 is not attached, the front end surface 26 of the cushion cowl 25 serves as an intake portion for the outside air into the casing. Therefore, it is preferable that the end surface 26 be appropriately uneven.

As shown in detail in FIGS. 3 (a) and 3 (b), the temporary fixing device 30 includes a plurality of needles 31, a sleeve 32 in which the needles are fitted and held, an elastic member 34 for pressing the needles 31, and the elasticity thereof. The holding member 33 holds the member 34. The sleeve 32 is fitted over the profiled tube 21. When the dry spray asbestos removing apparatus of the present invention is pressed against the asbestos surface, the needle 31 sticks to the asbestos surface to temporarily fix the dry spray asbestos removing apparatus at this working position. Therefore, the needle 31 is arranged with its pointed tip facing the front end of the dry asbestos removing device, and is held in the insertion hole of the sleeve 32 parallel to the cutter rotation axis. The needle 31 is biased in the front end direction by the elastic material 34, and the tip of the needle 31 sticks into the asbestos layer. When the device of the present invention advances, as shown in FIG. 3 (c), the tip of the needle is prevented from advancing by the wall material base 50, and when the device of the present invention is advanced to cut the asbestos layer, the needle
The elastic member 34 pushes the elastic member 34 rearward and moves back relative to the sleeve 32 as shown in FIG. 3 (c).

The outside air intake jig 40 is interposed in the contact portion with the wall surface of the cushion cowl 25, and is composed of, for example, an outer cylinder 41 and an inner cylinder 42, and the inner cylinder 42 has a large number of legs provided on the outer periphery thereof. It is fixed in the outer cylinder 41 by 43, and a slit-shaped air intake opening is formed between the outer cylinder 41 and the inner cylinder 42. The tip 44 of the inner cylinder 42 is the outer cylinder.
It projects further forward than the tip of 41 and has a notch 45
Is provided. This notch 45 is an air intake opening of the inner cylinder. FIG. 4 is a longitudinal sectional view showing the operation of the outside air intake jig 40. The tip 44 of the inner cylinder 42 is in contact with the asbestos layer 51,
A gap 49 is kept between the tip of the outer cylinder 41 and the asbestos layer 51. Outside air is introduced through the gap 49, and the notch at the tip 44 of the inner cylinder
The primary air 46 that enters the inner cylinder from 45 and the secondary air 47 that passes through the slit between the outer cylinder 41 and the inner cylinder 42 are sucked. The asbestos 52 cut by a cutter (not shown) is collected by the primary air 46, but even if there is something that is not collected, the secondary air 47 collects this so that asbestos will not leak to the outside air. Not at all.

FIG. 2 is an assembly view of each part except the outside air intake jig. The sleeve 32 is externally fitted to the deformed pipe 21 of the casing, and the cushion cowse 25 is externally fitted to the sleeve 32. The front end 26 is the frontmost, the tip of the needle 31 is next to this, and the front end of the cutter 11 is located rearmost.

A method of using the dry spray asbestos removing apparatus of the present invention will be described below.

The operator holds the deformed pipe 21 of the dry asbestos spraying removal device with a handle (not shown), and turns on the start switch of the negative pressure dust collector at hand and the switch of the cutter motor,
Press the tip end 26 of the cushion cowl 25 against the wall.

The cushion cowl 25 is contracted by the pressing force, the tip of the needle 31 sticks to the wall surface, and the dry removal device for sprayed asbestos is temporarily fixed. When this device is further advanced, the blade edge of the cutter 11 comes into contact with the sprayed asbestos and scrapes it off. The scraped off sprayed asbestos is recovered from the branch pipe 22 through the vacuum hose 23 into the recovery tank of the negative pressure dust collector. While the cutter 11 bites into the spray material and rotates, the needle 31 serves to fix the removing device to the wall surface, and therefore, there is no fear that the worker's hand will be shaken by the rotational force and wobble. Since the needle retracts due to the function of the elastic material, the spray material with a thickness of 60 mm can be scraped off in one operation. After shaving off one place, remove the removing device from the wall surface, move to the next place, and repeat the above operation. When separated, the cutter, the needle, and the cowl are separated from the wall surface in this order, so that all the minute scattered substances caused by contact with the sprayed asbestos are sucked into the cowl and are not scattered outside the removing device. Immediately after the crow leaves the wall, the scattered substances generated by the contact between the rim of the crow and the wall are sucked into the crow.

The motor rotation shaft and the torque transmission rod and the attachment part between the rod and the cutter are detachable, so the type of cutter can be freely selected and replaced. A wire brush can also be attached. It is also easy to select and replace the rod length according to the thickness of the asbestos sprayed on the wall surface.

Further, in the dry asbestos dry removing device of the present invention, the mounting portion between the deformed pipe and the motor is also detachable, so that it is easy to mount a blast nozzle instead of the motor and use it as a vacuum blast head.

〔The invention's effect〕

The spray type asbestos dry type removal device of the present invention prevents the scattering of asbestos dust even if the removal is performed without spraying the dust scattering inhibitor, and it is possible to efficiently remove asbestos, thereby significantly improving the working environment. Therefore, it is possible to remove the sprayed material such as the machine room and the electric room, which has been inconvenient in the wet method so far.

In addition, it is lightweight and handy due to its simple structure.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a spray type asbestos dry removing apparatus of the present invention, FIG. 2 is a longitudinal sectional view of (a), (b) is a front view, and FIG. 3 is an explanatory view of the action of a needle (a). ) Is a front view of the sleeve, (b) and (c) are vertical sectional views thereof, and FIG. 4 is a vertical sectional view showing the action of the outside air intake jig. 10 …… Cutter device, 11 …… Cutter 12 …… Rod, 13 …… Coupling 14 …… Motor, 20 …… Casing 21 …… Deformed pipe, 22 …… Branching pipe 25 …… Cushion cous 30 …… Temporary fixing Device, 31 …… Needle 32 …… Sleeve, 33 …… Holding material 34 …… Elastic material, 40 …… Outside air intake jig 41 …… Outer cylinder, 42 …… Inner cylinder 43 …… Leg, 44 …… Tip 45 …… Notch, 46 …… Primary air 47 …… Secondary air

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ken Hamada 1140-2 Mitsushima, Kadoma-shi, Osaka Prefecture Atsushi Iron Works Co., Ltd. (72) Inventor Ryohei Noda Constec Co., Ltd. 3-8-6 Tsubuhoncho, Nishi-ku, Osaka City, Osaka Prefecture

Claims (2)

[Claims] 1. A rotary cutter for cutting blown asbestos at a front end face, a dust collecting casing which covers the cutter and has a cushion cous at its front end that abuts against a wall surface, and a temporary fixing of the casing to the wall surface. A dry asbestos removing device for spraying asbestos, characterized by comprising a fixing device. 2. An outside air intake jig having a contact area with the wall surface of the cushion cowl covering the contact area with the wall surface and having an air intake opening near the wall surface. The dry-type removing device for sprayed asbestos according to claim 1.