JP4053172B2 - Method and apparatus for cutting reinforcing bars in a cylindrical structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of cutting and removing a reinforcing bar installed in a state of traversing the inside thereof when disassembling or repairing a cylindrical structure such as a chimney, and an apparatus therefor.
[0002]
[Prior art]
As is well known, lining materials with fire resistance and heat insulation are applied inside the large chimneys of reinforced concrete, but asbestos is often used as the lining material in the chimneys constructed in the past. It was.
[0003]
In recent years, asbestos has been shown to be harmful, asbestos must be removed from the chimney inner surface to replace it with a safe lining material or to dismantle the existing chimney. Means for performing it safely and efficiently is required, and for example, development of a lining material removing apparatus as shown in FIG. 2 is in progress. The removal device 1 shown in FIG. 2 is disposed in the center of the chimney 2 by an arm 5 that is inserted into the chimney 2 from the top and supported by a wire 4 through a suspension frame 3 and that projects from the inner surface of the chimney 2. In this state, the inside of the chimney 2 is lowered while the lining material 7 is scraped off by the cutting head 6, and safe and efficient work can be performed by remote operation from outside the chimney 2.
[0004]
[Problems to be solved by the invention]
By the way, as shown in FIG. 2, the reinforcing bar 8 may be provided in the chimney 2 in a transverse state. The rebar 8 is the one provided as the separator of the mold when the chimney 2 is constructed, but is left as it is. If such a rebar 8 is present, the removal device 1 cannot be lowered. Therefore, prior to the removal work of the lining material 7, it is necessary to cut the reinforcing bar 8, and therefore it is urgently required to develop an effective means that can efficiently perform the cutting work of the reinforcing bar 8.
[0005]
[Means for Solving the Problems]
In view of the above circumstances, the invention of claim 1 is a reinforcing bar cutting method applied when cutting and removing a reinforcing bar installed in a state crossing the inside of a cylindrical structure such as a chimney, wherein the cylindrical shape The main part of the reinforcing bar cutting device is inserted into the inside from the top of the structure, suspended by a lifting tool, and placed at a position directly above the reinforcing bar to be cut. The main part is remotely operated from the outside of the cylindrical structure. It is made to operate | move and cut | disconnect the both ends of the said reinforcing bar.
[0006]
The invention of claim 2 is a reinforcing bar cutting apparatus suitable for use in carrying out the reinforcing bar cutting method of the invention of claim 1, and a main body part inserted into the inside from the top of the cylindrical structure; A hanger for suspending the main body part in the cylindrical structure, and a main body part in the cylindrical structure by taking a reaction force on the inner surface of the cylindrical structure provided at the upper part of the main body part A holding mechanism for holding at a substantially central position, and a cutting machine provided at a lower portion of the main body portion for cutting the reinforcing bar.
[0007]
According to a third aspect of the present invention, in the reinforcing bar cutting apparatus according to the second aspect of the invention, the main body portion includes a guide mechanism that guides the cutting machine to a cutting position, and the guide mechanism is provided at a lower portion of the main body portion. The cutting machine is positioned in the vertical direction by abutting a leg portion that is relatively rotatable with respect to the reinforcing bar, and the main body is rotated in this state so that the cutting machine has a cylindrical structure. It is configured to perform circumferential positioning by rotating and moving along the inner surface of the object.
[0008]
According to a fourth aspect of the present invention, in the rebar cutting device according to the third aspect of the invention, the main body portion includes a slide mechanism that performs a radial positioning by moving the cutting machine in a radial direction of the cylindrical structure. It is a thing.
[0009]
According to a fifth aspect of the present invention, in the reinforcing bar cutting device according to the second, third, or fourth aspect of the invention, the main body portion is a surveillance camera capable of photographing the inside of the cylindrical structure and monitoring the image outside. The light source is provided.
[0010]
A sixth aspect of the present invention is the reinforcing bar cutting apparatus according to the second, third, fourth or fifth aspect of the present invention, wherein any one of a gas torch, an electric disk sander, and a water jet cutting machine is used as the cutting machine.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic configuration diagram showing an embodiment of a reinforcing bar cutting device of the present invention. Prior to removing the lining material 12 on the inner surface of the chimney 11, the reinforcing bar cutting device 10 of the present embodiment is for cutting the reinforcing bar 13 installed in a transverse state in the chimney 11. The reinforcing bar cutting device 10 according to the present embodiment includes a main body 14 inserted into the chimney 11 from the top thereof, and an upper part of the main body 14. A holding mechanism 15 that holds the central portion of the main body 14, a suspension 16 that is inserted through the holding mechanism 15 to suspend and rotate the main body 14 in the chimney 11, and is provided below the main body 14, and cuts the reinforcing bar 13. The cutting machine 17 is a main component.
[0012]
That is, the holding mechanism 15 is provided on the upper portion of the main body 14 so as to be relatively rotatable, and the hanging tool 16 is inserted through the holding mechanism 15, and the main body 14 is rotated by rotating the hanging tool 16. Can be done. Further, a leg portion 19 as a guide mechanism for the cutting machine 17 is attached to the lower portion of the main body portion 14 through a bearing 20 so as to be relatively rotatable, and the main body portion 14 is suspended in the chimney 11 by a hanging tool 16. And the leg portion 19 can be placed on the reinforcing bar 13 to be cut, and the load of the entire reinforcing bar cutting device 10 can be entrusted to the reinforcing bar 13, and in this state, the vertical positioning of the cutting machine 17 is automatically performed, and the above-described hanging tool The main body 14 is rotated by 16 so that the cutting machine 17 can be positioned in the circumferential direction. Note that a general-purpose electrical pipe can be used as the hanging tool 16.
[0013]
The holding mechanism 15 is provided with at least three arms 21 on the outer periphery of the cylindrical body 18 so as to be opened and closed like an umbrella bone by a link 23 and inserted into the chimney 11 with each arm 21 closed. Thereafter, when the operation rope 22 is pulled and the cylinder 18 and the link 23 are pulled up, each arm 21 is opened and its tip is pressed against the inner surface of the chimney 11, whereby the main body 14 is naturally positioned at the center position of the chimney 11. And can be held stably.
[0014]
A gas torch is employed as the cutting machine 17 in the present embodiment, and this cutting machine 17 is held by the main body 14 via a slide mechanism 24. The slide mechanism 24 moves the cutting machine 17 in the radial direction of the chimney 11. When an operation rope (not shown) is pulled, the cutting machine 17 slides radially outward, and when it is loosened, the cutting machine 17 is moved by a return spring (not shown). It is designed to be pulled back to the center side. Then, the cutting machine 17 is positioned in the radial direction by the slide mechanism 24. By providing the slide mechanism 24, the reinforcing bar cutting apparatus 10 can be applied to various chimneys having different inner diameter dimensions without any trouble. It is possible.
[0015]
As shown in FIG. 1B, a cutting plate 17 is provided with a contact plate 28 that abuts against the reinforcing bar 13 and serves as a guide for cutting work. Although not shown, the rebar cutting device 10 includes a monitoring camera capable of photographing the inside of the chimney 11 and monitoring the image outside, and a light source for photographing, and monitors the image. However, the cutting work can be performed by remote control from outside the chimney 11.
[0016]
In order to cut the reinforcing bar 13 by the reinforcing bar cutting device 10 having the above-described configuration, the arm 21 of the holding mechanism 15 is closed as described above, and the cutting machine 17 is ignited with the cutting machine 17 positioned inside, The main body 14 is suspended by the hanging tool 16, and when the leg 19 is placed on the reinforcing bar 13, the operation rope 22 is pulled to open the arm 21, and the main body 14 is held at the center of the chimney 11. Thereby, the vertical positioning of the cutting machine 17 is automatically performed.
[0017]
Next, the cutter 17 is moved radially outward by moving the slide mechanism 24 forward, and the cutter 17 is positioned in the radial direction.
[0018]
Therefore, the hanger 16 is operated to rotate the main body portion 14 so that the tip of the cutting machine 17 faces one end portion of the reinforcing bar 13, and the main body portion 14 is cut while gradually rotating the main body portion 14. Rotate 180 degrees and cut the other end. At this time, the contact plate 28 is brought into contact with the reinforcing bar 13 so that positioning at the time of completion of cutting or positioning at the time of starting cutting can be easily and reliably performed. The above operation may be performed by remote operation while monitoring the video from the surveillance camera.
[0019]
If both ends of the reinforcing bar 13 are cut, the reinforcing bar 13 will naturally fall, so that the holding mechanism 15 is restored by operating the operation rope 22, and if there is another reinforcing bar 13 below, the hanger 16 is pulled down and the main body part 14 is suspended to that position, and the same operation is repeated. When all the reinforcing bars 13 are cut, the main body 14 is lifted to the top of the chimney 11 to complete the operation.
[0020]
By performing the above procedure using the reinforcing bar cutting apparatus 10 of the above embodiment, it is possible to safely, easily and efficiently perform the cutting operation of the reinforcing bar 13 provided in a state of traversing the chimney 11. is there.
[0021]
In the above embodiment, a gas torch is used as the cutting machine 17, but other cutting machines such as an electric disk sander or a water jet cutting machine can be used instead of the gas torch as long as the rebar 13 can be cut. In this case as well, an efficient cutting operation can be performed. In addition, the configuration of the holding mechanism 15 and the hanging tool 16 can be appropriately changed in design, and the configuration of the leg portion 19 as the guide mechanism and the configuration of the slide mechanism 24 can be variously changed. Depending on the case, they can be omitted. Furthermore, when the work can be performed while looking inside from the top of the chimney 11, a monitoring camera and a light source are not necessarily provided. Of course, it goes without saying that the present invention is not limited to the chimney 11 and can be widely applied to all tubular structures of the same form.
[0022]
【The invention's effect】
The method of cutting a reinforcing bar according to the first aspect of the present invention is such that the main body of the reinforcing bar cutting device is inserted from the top of a cylindrical structure such as a chimney into the interior thereof, and is placed and suspended at a position directly above the reinforcing bar to be cut. Is operated by remote operation from the outside and both ends of the reinforcing bar are cut, so that the cutting work can be easily and efficiently performed.
[0023]
A reinforcing bar cutting device according to a second aspect of the present invention includes a main body portion inserted into a cylindrical structure from the top thereof, a hanging tool for hanging the main body portion, and a holding mechanism for holding the main body portion at a substantially central position. And a cutting machine for cutting the reinforcing bars, it is possible to easily and efficiently carry out the reinforcing bar cutting work, and it is optimally adopted when the above method is carried out.
[0024]
In the reinforcing bar cutting device according to the third aspect of the present invention, the leg portion provided in the lower portion of the main body portion is relatively rotatable so as to contact the reinforcing bar, thereby positioning the cutting machine in the vertical direction and rotating the main body portion. With the guide mechanism configured to position the cutting machine in the circumferential direction, the cutting machine can be positioned easily and reliably.
[0025]
The rebar cutting device according to the invention of claim 4 includes a slide mechanism that performs positioning in the radial direction by moving the cutting machine in the radial direction of the cylindrical structure. Can be applied without any problem.
[0026]
The rebar cutting device of the invention of claim 5 includes a surveillance camera capable of photographing the inside of the cylindrical structure and monitoring the image on the outside and a light source for photographing, so that remote operation is easily and reliably performed. obtain.
[0027]
Since the reinforcing bar cutting apparatus according to the sixth aspect of the present invention uses any of a gas torch, an electric disk sander, and a water jet cutting machine as a cutting machine, any of them can perform efficient cutting.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a reinforcing bar cutting device of the present invention.
FIG. 2 is a view showing an outline of an apparatus for removing a lining material on the inner surface of a chimney.
[Explanation of symbols]
10 Rebar cutting device 11 Chimney (tubular structure)
13 Reinforcing bar 14 Body 15 Holding mechanism 16 Lifting tool 17 Cutting machine (gas torch)
19 Leg (guide mechanism)
24 Slide mechanism 28 Contact plate

Claims (6)

When cutting and removing the reinforcing bars installed in a state of crossing the inside of a cylindrical structure such as a chimney,
The main part of the reinforcing bar cutting device is inserted from the top of the cylindrical structure into the interior thereof, is suspended by a hanging tool, and is disposed at a position directly above the reinforcing bar to be cut. A method for cutting a reinforcing bar in a cylindrical structure, wherein the reinforcing bar is operated by remote control of the cutting to cut both ends of the reinforcing bar. An apparatus for use in performing the method of claim 1, comprising:
A main body portion inserted into the cylindrical structure from the top thereof;
A hanger for suspending the main body in the cylindrical structure;
A holding mechanism that is provided at an upper portion of the main body portion and holds the main body portion at a substantially central position in the cylindrical structure by taking a reaction force on the inner surface of the cylindrical structure;
A rebar cutting device in a cylindrical structure, comprising: a cutting machine provided at a lower portion of the main body portion to cut the rebar. The main body portion includes a guide mechanism that guides the cutting machine to a cutting position, and the guide mechanism abuts a leg portion provided at a lower portion of the main body portion so as to be rotatable relative to the main body portion to the reinforcing bar. In this configuration, the cutting machine is positioned in the vertical direction, and the main body is rotated in this state to rotate the cutting machine along the inner surface of the cylindrical structure to perform circumferential positioning. The reinforcing bar cutting device in a cylindrical structure according to claim 2, wherein the reinforcing bar is cut. The said main-body part is equipped with the slide mechanism which positions in a radial direction by moving the said cutting machine to the radial direction of the said cylindrical structure, The cylindrical structure in Claim 3 characterized by the above-mentioned. Rebar cutting device. 5. The cylinder according to claim 2, 3 or 4, wherein the main body includes a surveillance camera capable of photographing the inside of the cylindrical structure and monitoring the image outside and a light source for photographing. Rebar cutting device in the structure. 6. The reinforcing bar cutting device in a cylindrical structure according to claim 2, 3, 4 or 5, wherein the cutting machine is any one of a gas torch, an electric disk sander, and a water jet cutting machine.

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