JPH11200640A - Lining material dismantling method and device for cylindrical structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently dismantle a lining material on the inner face of a cylindrical structure including a funnel without depending on manpower. SOLUTION: After a device mainbody 10 is lifted down to the lowest portion of a funnel T with a lift 15, the rotation of the device mainbody is locked to be freely lifted with a reaction device 12 provided on the device mainbody. In such a state, the device mainbody is lifted up with the lift, while cutting the lining material 2 with the rotary cutter 20 by driving a cutting head 11 provided on the device mainbody, to continuously cut and remove the lining material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing a lining material from the inner surface of a tubular structure such as a chimney.

[0002]

2. Description of the Related Art For example, a lining material is adhered to a chimney for the purpose of improving heat insulation and fire resistance. In the past chimneys, asbestos (asbestos) harmful to the human body was used as a lining material.

Conventionally, such removal of the lining material from the inner surface of the chimney is performed by an operator scraping the lining material from above the chimney using a wrench rod. For this reason, the working range at one time has been limited to a range (about 2 m) that can be reached by the Keren bar.

FIGS. 9A to 9D show a conventional work procedure. In the figure, T indicates a chimney, 1 indicates a surrounding wall concrete, and 2 indicates a lining material (for example, asbestos). As shown in (a), the chimney T is dismantled by removing the lining material 2 within a reach of the keren rod, and then removing the surrounding wall concrete 1 (portion from which the lining material 2 is removed) as shown in (b). It is dismantled, and thereafter, by repeating this as shown in (c) and (d).

[0005]

However, the conventional method is a manual operation and is inefficient. Also,
Since the worker removes the lining material directly, there is a danger that the worker may inhale the scattered material from the lining material in addition to the danger of working at heights. Especially when the lining material is asbestos, there is a safety problem.

An object of the present invention is to provide a removing method and apparatus capable of efficiently removing a lining material without relying on humans in order to ensure the safety of workers in consideration of the above circumstances. .

[0007]

According to a first aspect of the present invention, there is provided a method for removing a lining material on an inner surface of a tubular structure such as a chimney, wherein a main body of the lining material removing device is moved up and down by a lifting device. After hanging down to the bottom of the device, the rotation of the device main body is stopped by the reaction force device provided in the device main body so that the device main body can be moved up and down.In this state, the cutting head provided in the device main body is driven and the lining material is The cutting of the lining material is performed continuously by raising the apparatus main body by the lifting device while cutting the lining material.

According to a second aspect of the present invention, in the first aspect, a reaction force receiver of the reaction device is installed above the uppermost portion of the cylindrical structure, and the reaction structure is utilized by utilizing the reaction force receiver. The lining material is cut and removed up to the top.

According to a third aspect of the present invention, there is provided a method for removing a lining material on the inner surface of a tubular structure such as a chimney, wherein the apparatus body of the lining material removing device is suspended inside the tubular structure by an elevating device. In the state where the cylindrical structure is positioned at the height of the cutting position at the time and the rotation of the apparatus main body is stopped at that position, the cutting head provided on the apparatus main body is driven, and the lining around the cutting position is rotated by the rotary cutter. It is characterized in that only the material is cut and removed, and this operation is repeated for each cutting position of the tubular structure at the time of dismantling.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the internal air is sucked from a lower portion of the tubular structure to cut the lining material while maintaining the inside of the tubular structure at a negative pressure. The removal operation is performed.

According to a fifth aspect of the present invention, there is provided an apparatus for removing a lining material on the inner surface of a cylindrical structure such as a chimney, wherein the apparatus main body is suspended inside the cylindrical structure by an elevating device, and the apparatus main body. A reaction force device that is mounted on the device and stops the device body in a state in which the device body can be moved up and down by taking a reaction force on the inner surface of the tubular structure; And a cutting head for performing the following.

According to a sixth aspect of the present invention, in the fifth aspect, the rotary cutter comprises: a rotary frame which is driven to rotate about a substantially axis of the cylindrical structure; And a cutting blade that is displaced radially outward of the rotating frame by centrifugal force generated by rotation of the rotating frame and pressed against the lining material.

According to a seventh aspect of the present invention, in the sixth aspect, the cutting blade is formed of a circular blade having a center hole and an outer periphery serving as a blade, and the center hole of the cutting blade is formed in an outer peripheral portion of the rotary frame. The cutting blade can be displaced in the radial direction of the rotating frame by being fitted with play on the shaft fixed to the shaft.

According to an eighth aspect of the present invention, in any one of the fifth to seventh aspects, a plurality of rotary cutters are provided in a vertical direction,
One of the upper and lower steps is used for cutting the lining material, and the other is used for finishing the remaining lining material of the rotary cutter for cutting the lining material together with the surrounding wall concrete of the tubular structure. Features.

A ninth aspect of the present invention is characterized in that, in any one of the fifth to eighth aspects, the rotary cutter is provided in two upper and lower stages, and the upper rotary cutter and the lower rotary cutter are reversely rotated.

According to a tenth aspect of the present invention, in any one of the fifth to ninth aspects, the apparatus main body is provided with a nozzle for spraying a lining material scattering prevention liquid at a cutting position of the rotary cutter. And

According to an eleventh aspect of the present invention, in any one of the fifth to tenth aspects, a wheel that bites into the lining material when the reaction force device is pressed against the lining material on the inner surface of the tubular structure; And a pressing device that presses the wheel against the lining material by projecting the supporting leg, wherein the wheel is spaced apart from the lining material by three in the circumferential direction.
A plurality of pieces are arranged so as to be rollable in the axial direction of the tubular structure.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which the lining material 2 on the inner surface of the chimney T is cut and removed by the lining material removing device of the embodiment. First, the lining material removing device will be described first.

The lining material removing device has a device main body 10 suspended inside a chimney T by a wire 16 of a lifting device 15 such as a winch. Device body 10
As shown in the enlarged view of FIG.
A cutting head 11 for cutting and removing the lining material by rotation of 0 is provided, and a reaction force device 12 for stopping the rotation of the apparatus main body 10 in a state capable of moving up and down by taking a reaction force on the inner surface of the chimney T is provided at the upper portion. ing. Rotary cutter 20
Is a rotary frame 2 that is driven to rotate about the center of the chimney T.
3, and a plurality of cutting blades 25 arranged on the outer peripheral portion of the rotating frame 23 at intervals in the circumferential direction, as shown in FIG. The center of the rotary frame 23 is the rotary drive motor 2
One downward facing output shaft 22. In this example, four cutting blades 25 are arranged in the circumferential direction.

The cutting blade 25 is constituted by a circular blade having a center hole 25a and having an outer periphery as a blade. The center hole 25a is fitted with play to a shaft 24 fixed to the outer periphery of the rotating frame 23. Thus, the rotating frame 23 can be displaced in the radial direction. Therefore, the cutting blade 25 is displaced radially outward of the rotating frame 23 by centrifugal force due to the rotation of the rotating frame 23 and is pressed against the lining material 2.

In this rotary cutter 20, the cutting blades 25 are provided in multiple stages in the vertical direction as shown in FIG. Here, six stages of cutting blades 25 are provided. Here, the entirety is the rotary cutter 20, but it can be said that the rotary cutter is configured for each stage. The type and size of the four cutting blades 25 in each stage are the same, and the type and size are different for each stage or for a plurality of stages. The upper two cutting blades 25A are cutting blades dedicated to lining material cutting. Further, the lower four cutting blades 25B are finishing cutting blades for completely cutting and removing the lining material left behind by the upper cutting blade 25A for each surface layer of the peripheral wall concrete 1 of the chimney T (see FIG. 1). . Therefore, the lower the cutting blade 25, the larger the diameter and the amount of play (center hole 25a), so that it can protrude toward the outer periphery.

FIG. 5 shows the types of the cutting blade 25.
(A) and (b) are cutting blades 25A dedicated to lining material cutting.
Is shown. These cutting blades 25A have a circular saw shape having a large number of sharp corners, and can cut and remove the lining material efficiently. (C) and (d) are
Cutting blade 25 for finishing to the surface of concrete
B is shown. These cutting blades 25B have chips 26 and 27, such as carbide and stellite, embedded in the outer peripheral portion, and are capable of cutting concrete.

As shown in FIG. 2, a nozzle 29 is provided above the cutting head 11. The nozzle 29 is for spraying a scattering prevention liquid to a cutting portion so that cutting powder of the lining material is not scattered.

As shown in FIGS. 2 and 3, the reaction force device 12 provided on the upper portion of the apparatus main body 10 has a total of six upper and lower stages radially provided with respect to the axis center of the apparatus main body 10.
It has a plurality of support legs 31 and wheels 32. These are arranged at intervals of 120 degrees in the circumferential direction for each step, and wheels 32 are rotatably attached to the tips of the support legs 31. The wheels 32 are sharper toward the outer periphery, and bite into the lining material when pressed against the lining material. Further, the wheel 32 is provided so as to be freely rotatable in a vertical plane along a radial direction centered on the axis center of the apparatus main body 10, so that when the wheel 32 bites into the lining material, the wheel 32 moves vertically (in the axial direction of the chimney). Although rolling,
Do not move in the circumferential direction of the lining material. Accordingly, the rotation of the apparatus main body 10 can be stopped by taking a reaction force on the lining material.

The upper end of each support leg 31 is connected to the reaction force device frame 30 by a pin so as to be vertically swingable. The operation of a hydraulic cylinder 35 as a pressing device causes each support leg 31 to project outward at each stage. It can be retracted inside. The right support leg 31 in FIG. 2 shows a state in which the support leg 31 is retracted inward, and the left support leg 31 shows a state in which it protrudes outward. Note that at least three wheels 32 are required for each stage, and the number may be more than three. Further, the number of stages of the wheels 32 in the vertical direction may be one, three or more. The point is that it is only necessary to be able to maintain a good balance and to stably stop the rotation of the apparatus body 10. If the chimneys have different inner diameters, the wheels 32 having an appropriate diameter can be used. Further, as a pressing device for extending the support leg 31, a configuration in which the support leg 31 is extended by the elastic force of a spring and retracted by a hydraulic cylinder may be employed.

Next, a procedure (method) for removing the lining material will be described. First, before starting the actual work, the gantry 17 is installed above the chimney T as shown in FIGS. A reaction force receiver 18 that is continuous with the inner surface of the chimney T is attached to the mount 17. At the bottom of the chimney T, a waste material collection duct 6 with a waste material collection receptacle 6a is provided.
And the ventilation duct 7, the waste material collection duct 6 leads to a vacuum collection device, and the ventilation duct 7 leads to a dust collection device.

When the above preparations are completed, the apparatus main body 10 is suspended by the elevating device 15, and the apparatus main body 10 is lowered into the chimney T. After hanging down to the lowermost part, the support legs 31 of the reaction force device 12 mounted on the upper part of the apparatus main body 10 are extended outward, and the wheels 32 are pressed against the lining material 2 to be bitten. Thus, the apparatus main body 10 can be freely moved up and down, but is reliably stopped from rotating. In this state, the cutting head 11 mounted on the lower part of the apparatus main body 10 is driven to rotate the rotary cutter 20. Then, the cutting blade 25 moves to the outer peripheral side by the centrifugal force generated by the rotation of the rotary cutter 20, and cuts the lining material 2. At this time, since the lower cutting blade 25B scrapes off the remaining portion of the lining material by the upper cutting blade 25A together with the surface layer of the concrete 1, the lining material can be removed cleanly. Simultaneously with this cutting operation, the apparatus main body 10 is pulled up by the elevating device 15. By doing so, it is possible to continuously cut and remove the lining material 2.

The cut and removed waste material is sucked by the collection duct 6 and carried to the collection device. Work proceeds from bottom to top, and when it reaches the top of the chimney T, the wheel 32 of the reaction force device 12 is pressed against the reaction force receiver 18 installed in advance, and the work is continued similarly. This makes it possible to cleanly remove the lining material from the bottom to the top of the chimney. During the above operation, the inside air is sucked from the lower duct 7 to keep the inside of the chimney T at a negative pressure. Thereby, scattering of the cutting powder to the outside can be prevented.

As described above, since the lining material can be automatically removed using the lining material removing device, the operation can proceed efficiently with little need for human labor, and the safety of the operation can be improved. it can. In addition, since the cutting blade 25 of the rotary cutter 20 cuts the lining material 2 while being displaced outward by centrifugal force, the cutting blade 25 automatically follows changes in the inner diameter of the chimney, and excessive force is applied. No overload.

In the above-mentioned method, a case has been described in which all the lining material is removed in advance before the concrete of the surrounding wall of the chimney is disassembled. However, if only the purpose of preventing scattering of the lining material during the surrounding wall concrete cutting operation is described. It is not necessary to remove all lining materials. FIG. 7 shows an example of the method.

In this method, the apparatus main body of the lining material removing apparatus is suspended inside the chimney and positioned at the cutting position of the surrounding concrete 1 at the time of dismantling, and the rotation of the apparatus main body is stopped at that position. Do. Then, the cutting head provided in the apparatus main body is driven while being stopped at that position, and only the lining material 2 around the cutting position is cut and removed by the rotary cutter. Repeat this for each cutting position,
As shown in FIG. 7A, the lining material 2 around the entire cutting position is removed. The part to be removed is indicated by reference numeral 3. In this case, the positioning of the apparatus main body at the cutting position height is performed by measuring the feeding length or winding length of the wire of the lifting / lowering apparatus which suspends the apparatus main body, using an encoder or the like provided on the pulley. Can be. After removing the lining material at all the cutting positions, the peripheral wall concrete 1 is cut at the cutting position as shown in FIGS. 7B and 7C and disassembled from above.

By proceeding in this manner, removal of the lining material on site can be minimized. Moreover, since the lining material can be removed semi-automatically by the lining material removing device, the work can proceed efficiently without relying on humans, and the chimney can be safely dismantled.

In the above embodiment, the case where all the rotary cutters are rotated in one direction has been described. However, the rotary cutter may be divided into upper and lower stages and rotated in reverse. FIG. 8 shows an example. The cutting head 1 of the device main body 10B
In 1B, a planetary gear mechanism 40 of a fixed carrier type is provided on the output side of the motor 21, and the output shaft 22 connected to the sun gear and the outer frame 41 connected to the internal gear rotate in reverse at a constant speed. It is supposed to. And the output shaft 22
The lower rotary cutter 20A is connected to the outer frame 41.
Is connected to the upper rotary cutter 20B.

According to the apparatus main body 10B, since the upper and lower rotary cutters 20B and 20A are driven in reverse rotation, the rotational force generated by the cutting force can be canceled. Therefore, the load on the reaction device can be reduced.

[0035]

As described above, according to the lining material removing method of the first aspect of the present invention, the apparatus body is suspended, the reaction force device and the cutting head are operated, and the lining material is cut and removed by the rotary cutter. Therefore, the lining material can be efficiently removed without relying on humans, and when the lining material is a harmful substance such as asbestos, the safety of workers can be ensured. In particular, since the lining material is cut and removed upward from the lowermost part, the work can be performed while applying a reaction force during rotational cutting to the lining material above the cut portion, and stable work can be performed. Further, if the reaction force receiver is provided above the uppermost part of the tubular structure as in the invention of claim 2, the lining material can be completely cut and removed continuously to the uppermost part of the tubular structure.

According to the lining material removing method of the third aspect of the present invention, the apparatus main body is hung, the reaction force device and the cutting head are operated, and only the lining material around the cutting position when the tubular structure is dismantled is removed. Since the cutting is performed by the rotary cutter, the minimum lining material can be efficiently removed without relying on manual labor. Therefore, thereafter, by cutting the tubular structure at the position where the lining material has been removed, the tubular structure can be safely dismantled without scattering the lining material.

According to the lining material removing method of the fourth aspect of the present invention, the lining material is cut and removed while suctioning the internal air from the lower part of the tubular structure and maintaining the inside of the tubular structure at a negative pressure. In addition, it is possible to prevent the lining material from scattering to the outside.

According to the lining material removing device of the fifth aspect of the present invention, the removing method of the first aspect of the present invention can be carried out, and the lining material can be removed efficiently without relying on humans.

According to the lining material removing device of the invention of claim 6, since the cutting blade cuts the lining material while being displaced outward by centrifugal force, the cutting blade is automatically turned on when the inner diameter of the tubular structure changes. Can be followed. Further, when the cutting blade bites into the lining material, the cutting blade automatically escapes inward, thereby preventing overload and preventing damage to the cutting blade. In order to make the cutting blade freely displaceable in the radial direction, it may be configured as in the invention of claim 7.

According to the lining material removing device of the eighth aspect of the invention, the lining material left uncut by the cutting blade for cutting the lining material can be removed together with the concrete surface layer by the finishing cutting blade. It can be removed cleanly without leaving it.

According to the lining material removing device of the ninth aspect of the present invention, since the upper and lower rotary cutters are rotated in reverse, the cutting reaction force can be canceled and the load on the reaction force device can be reduced.

According to the lining material removing device of the tenth aspect of the present invention, since the lining material scattering prevention liquid is jetted to the cut portion, the scatter preventing effect can be surely improved.

According to the lining material removing device of the eleventh aspect of the present invention, the wheels of the reaction force device are made to bite into the lining material. Can be stopped,
Enables stable lining material cutting work with a rotary cutter.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a state in which a lining material on an inner surface of a tubular structure is cut and removed using a lining material removing device according to an embodiment of the present invention.

FIG. 2 is an enlarged side view showing a configuration of a device main body of the lining material removing device.

FIG. 3 is an enlarged plan view illustrating a configuration of a reaction force device of the apparatus main body.

FIG. 4 is a plan view schematically showing a rotary cutter of a cutting head of the apparatus main body.

FIGS. 5A to 5D are diagrams showing types of cutting blades attached to the rotary cutter.

FIG. 6 is a side sectional view showing a state in which the lining material at the uppermost portion of the tubular structure is cut and removed using the lining material removing device according to the embodiment of the present invention.

FIGS. 7A to 7C are explanatory views showing the procedure of another removal method of the present invention.

FIG. 8 is a partial side view of an apparatus main body in a lining material removing apparatus according to another embodiment of the present invention.

FIGS. 9A to 9D are explanatory views showing the procedure of a conventional lining material removing method.

[Explanation of symbols]

 T Chimney (tubular structure) 1 Body concrete 2 Lining material 3 Dismantling position 10,10B Equipment body 11,11B Cutting head 12 Reaction force device 20,20A, 20B Rotary cutter 23 Rotating frame 24 Axis 25 Cutting blade 25A Center hole 25A Cutting blade for lining material cutting 25B Cutting blade for finishing 29 Nozzle 31 Support leg 32 Wheel 35 Cylinder (pressing device)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Katsunori Manabe 1-23-7 Nishigotanda, Shinagawa-ku, Tokyo Inside Tokyo Trimtech Co., Ltd. (72) Osamu Mogami Inventor 1-23 Nishigotanda, Shinagawa-ku, Tokyo No. 7 Tokyo Trim Tech Co., Ltd.

Claims (11)

[Claims] 1. A method for removing a lining material on an inner surface of a tubular structure such as a chimney, wherein the device body of the lining material removing device is suspended by an elevating device to a lowermost portion in the tubular structure. The rotation of the device body is stopped by the reaction force device provided in the up and down state, and in that state, the cutting head provided on the device body is driven and the lining material is cut by the rotary cutter.
A method for removing a lining material from a tubular structure, wherein the lining material is continuously cut and removed by lifting the apparatus body by an elevating device. 2. The method according to claim 1, further comprising: installing a reaction force receiver of the reaction device above the uppermost portion of the tubular structure, and cutting and removing the lining material to the uppermost portion of the tubular structure using the reaction force receiver. The method for removing a lining material from a tubular structure according to claim 1, wherein: 3. A method for removing a lining material on an inner surface of a tubular structure such as a chimney, wherein the apparatus body of the lining material removing device is suspended inside the tubular structure by an elevating device to dismantle the tubular structure. With the product positioned at the height of the cutting position of the object and the rotation of the device main body stopped at that position, the cutting head provided on the device main body is driven and the rotary cutter cuts and removes only the lining material around the cutting position. And removing the lining material of the tubular structure by repeating this operation for each cutting position of the tubular structure at the time of dismantling. 4. A cutting and removing operation of the lining material while sucking internal air from a lower portion of the tubular structure and maintaining a negative pressure in the tubular structure.
The method for removing a lining material of a tubular structure according to any one of the above. 5. An apparatus for removing a lining material on an inner surface of a cylindrical structure such as a chimney, comprising: an apparatus main body suspended inside the cylindrical structure by an elevating device; A reaction force device for stopping rotation of the apparatus main body in a state capable of ascending and descending by taking a reaction force on the inner surface of the like structure; and a cutting head mounted on the apparatus main body and performing cutting and removal of a lining material by rotation of a rotary cutter. A lining material removing device for a tubular structure, comprising: 6. A rotary frame, which is rotatably driven about a substantially axial center of a cylindrical structure, and a plurality of rotary cutters are arranged on an outer peripheral portion of the rotary frame at intervals in a circumferential direction, and centrifugation is performed by rotation of the rotary frame. 6. A cutting blade which is displaced radially outward of the rotating frame by force and pressed against the lining material.
A lining material removing device for a tubular structure as described in the above. 7. The cutting blade is constituted by a circular blade having a center hole and having an outer periphery as a blade, and the center hole of the cutting blade has a play on a shaft fixed to an outer peripheral portion of the rotating frame. The lining material removing device for a tubular structure according to claim 6, wherein the cutting blade is made displaceable in a radial direction of the rotating frame by being fitted. 8. The rotary cutter is provided in a plurality of stages in the vertical direction, one of the upper and lower stages is used for cutting a lining material, and the other is formed in a cylindrical shape of the remaining lining material of the rotating cutter for cutting the lining material. The lining material removing device for a cylindrical structure according to any one of claims 5 to 7, wherein the lining material is used for finishing the surface layer of the peripheral wall concrete of the structure by cutting. 9. The tubular structure according to claim 5, wherein the rotary cutter is provided in two stages, upper and lower, and the upper rotary cutter and the lower rotary cutter are reversely rotated. Lining material removal equipment. 10. The cylindrical device according to claim 5, wherein the apparatus main body is provided with a nozzle for spraying a lining material scattering prevention liquid at a location cut by the rotary cutter. Equipment for removing lining materials from structures. 11. A wheel that bites into the lining material when pressed against the lining material on the inner surface of the tubular structure, a support leg that supports the wheel, and a projection of the support leg. And a pressing device for pressing the wheel against the lining material, wherein three or more wheels are arranged at circumferentially spaced intervals so as to be rollable in the axial direction of the tubular structure. Item 10. A lining material removing device for a tubular structure according to any one of Items 5 to 10.