JPH05202528A - Cutter for man-hole internal-wall - Google Patents

Abstract

PURPOSE:To quickly cut off the internal wall surface of a man-hole inexpensively fixing an arm on a bearing member set rotatably on the central shaft of a fixing member and setting a cutting-off blade rotatably on the arm. CONSTITUTION:The handle 11 of a cutter 4 is rotated, and a support 7 provided with a rack 10 is moved down, and a fixing member 8 is moved down in a man-hole 2, and a blade 31 is moved down to a specified position. After that, pressure-oil is fed to a cylinder 12, and a bearing rod 14 is pushed, and a contact section 16 is brought in pressure contact with a man-hole internal-wall 15, and the fixing member 8 is firmly fixed on the internal wall 15. After that, when the blade 31 is rotated and an arm 25 fixed on a bearing section 17 is rotated, then by the blade 31, the internal wall 15 is cut off in the circumferential direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole inner wall cutting machine for cutting the inner wall of a manhole from the road.

[0002]

2. Description of the Related Art When it is necessary to remove an existing manhole due to repair of sewerage facilities or road construction, the manhole conduit part made of concrete rising from the sewer pipe on the road should be cut to remove the manhole part. Is done.

In order to cut such a manhole conduit portion, the lid of the manhole is opened and the inner wall of the manhole is cut from the opening. For that purpose, various means are used, and one of them is a means for inserting a hydraulic seri arrow into a joint of a circular concrete ring in a manhole and lifting it by its taper. It is also possible to insert a cutter through a hole in a manhole and manually cut it. Further, a means for fixing the frame of the cutting machine on the road, lowering the cutting machine in the manhole, and cutting the inner wall surface has also been proposed.

[0004]

Among the above-mentioned conventional manhole inner wall cutting means, the one using the hydraulic serrated arrow can be adopted when the manhole conduit has a seam, but when there is no joint, the serrated arrow is used. Cannot be inserted, and this method has a drawback that it cannot be adopted.

Further, when manually cutting the inner wall surface of the manhole with a cutter, the working posture is unstable and only a small cutter can be used, so that the cutting depth cannot be increased.

Further, in the means for fixing the frame of the cutting machine on the road and lowering the cutting machine into the manhole, it is extremely difficult to receive a large cutting reaction force by the cutting machine, and the reaction force is received. Required a large amount of equipment and construction cost and a lot of time to fix the frame on the road.

[0007] Therefore, the present invention, by simple equipment,
An object of the present invention is to provide a manhole inner wall cutting machine that is inexpensive and can quickly cut the inner wall surface of a manhole.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned drawbacks of the prior art, the present invention provides a fixing member having a plurality of supporting arms radially provided with a contacting portion with an inner wall surface of a manhole, and a center of the fixing member. A support member rotatably provided with respect to the shaft, a support member rotation motor fixed to a fixed member, a blade driving motor fixed to the support member, and a cutting rotatably provided to an arm fixed to the support member. A blade for a manhole constitutes a machine for cutting the inner wall of a manhole, whereby the inner wall of the manhole can be cut inexpensively and quickly by a simple facility.

[0009]

Since the present invention is constructed as described above, when cutting the inner wall of the manhole, each supporting arm is brought into contact with the inner wall surface of the manhole to support the fixing member. Then, the blade driving motor is driven to rotate the blade and cut the inner wall of the manhole. On the other hand, the supporting member is rotated by driving the supporting member rotating motor. As a result, the cutting blade provided on the arm fixed to the support member rotates around the central axis of the support member while cutting the inner wall surface of the manhole, and gradually cuts deeper from the surface side of the inner wall of the manhole. The cutting position is gradually rotated by arbitrarily rotating the support member with respect to the fixed member, and the inner wall surface of the manhole is cut by making one rotation about the center of the fixed member. At that time, the reaction force at the time of cutting is received by the inner wall surface of the manhole by the support arm.

[0010]

Embodiments of the present invention will be described with reference to the drawings. Concrete inner wall 3 of manhole 2 on pavement 1
In the manhole inner wall cutting machine 4 for cutting, the fixing member 8 is provided at the lower end of the support column 7 which is vertically movable with respect to the frame 6 having the plurality of legs 5, and the rack 10 formed on the support column 7 is provided. By rotating the handle 11, the interlocking pinion can be moved up and down and set at an arbitrary position to be cut.

The fixing member 8 includes three support arms 1 in the drawing.
2 are provided in a radial pattern, and each support arm 12 includes a hydraulic cylinder 13 and a support rod 14 provided inside the hydraulic cylinder 13 so as to be movable back and forth.
The support rod 14 is provided with an abutting portion 16 against the inner wall 15 of the manhole. Therefore, pressure oil is supplied into the cylinder 13 so that each support rod 14 is connected to the cylinder 1.
3, the fixing member 8 is fixed to the central portion of the manhole by pressing the contact portion 16 against the inner wall 15 of the manhole.

A blade drive motor 18 is fixed to a fixed plate 9 provided at the tip of a support shaft 7 supported by a fixed member 8, and the blade drive motor 18 can be rotated around the center axis of the motor on the outer periphery of the blade drive motor 18. The support member 17 is provided.

The support member 17 has a disk shape, and inner teeth 20 are formed on the outer periphery thereof, and the inner teeth 20 have a gear 22 of an arm rotation motor 21 fixed to the fixing member 8.
Mesh with each other. When the arm rotating motor 21 is driven thereby, the supporting member 17 rotates around the central axis of the blade driving motor 18.

A drive shaft 23 of the blade drive motor 18 is provided with a drive sprocket 24, and a chain 30 is stretched between a driven sprocket 28 rotatably supported at the tip of an arm 25 fixed so as to project from the support member 17. Set up
By fixing the blade 31 to the shaft of the driven sprocket 28, the blade driving motor 18 drives the blade 31 to rotate. A diamond blade 32 for cutting concrete is formed on the outer periphery of the blade 31.

Various motors can be used as the blade driving motor 18, for example, a 400 Hz high frequency motor or a hydraulic motor is used.

When using the above cutting machine 4, the lid of the manhole whose inner wall is to be cut is opened, and the frame 6 is placed on top of it.
Move and set. Then, by rotating the handle 11, the support column 7 provided with the rack 10 is lowered into the manhole 2, and the fixing member 8 is lowered into the manhole below the support column 7.

After lowering the blade 30 to a predetermined position to be cut, pressure oil is supplied to the cylinder 12, the supporting rod 14 is pushed out, and the abutting portion 16 at its tip is pressed against the inner wall 15 of the manhole to fix it. Is firmly fixed to the center of the manhole 2. At that time, the support member 17 is rotated,
With the arm 25 in the retracted position, the blade 3
Set so that 1 does not contact the inner wall surface of the manhole.

From this state, the blade driving motor 18 is driven to rotate the blade 31 via the chain 30, and at the same time, the arm rotating motor 21 is driven to support the supporting portion 1.
The arm 25 fixed to 7 is rotated about the rotation axis of the blade driving motor 18. As a result, the blade 31 contacts the inner wall surface 15 of the manhole while rotating, and cuts the inner wall surface. When the arm 25 further rotates, the blade 31 cuts the inner wall surface deeper and moves in the circumferential direction of the inner wall surface.

When the arm 25 is in the most protruding state, the blade has the maximum cutting depth, and when the arm 25 further rotates, the cutting depth becomes gradually shallower and comes off the inner wall surface 15 again. Next, by rotating the frame 6 from outside the manhole and rotating the support column 7 by a predetermined angle, the cutting position of the blade 31 is displaced in the circumferential direction of the inner wall of the manhole,
When the arm 25 rotates in the same manner as described above, the same cut position makes one round in the manhole at that position, and the manhole inner wall is cut all around.

In the above embodiment, the arm rotating motor 21 is always driven to constantly rotate the arm. However, the arm is rotated at the time of the first cut, and the inner wall surface is cut at a predetermined distance. The arm may be rotated until the depth is reached and then stopped, and thereafter, the spindle 7 may be rotated to cut the arm while keeping the arm as it is and making a round of the inner wall surface. Further, the column 7 may be moved up and down by hydraulic pressure.

The reaction force generated when the inner wall surface of the manhole is cut by the blade as described above is received by the inner wall surface of the manhole through the support arm 12 and does not exert the reaction force on other members.

At the end of the cutting, the pressure oil in the hydraulic cylinder 13 of the support member 12 is drained and set in a free state, and then the handle 11 is rotated to raise the support, so that all the devices are moved out of the manhole and moved. ..

[0023]

EFFECTS OF THE INVENTION Since the present invention is constructed and operates as described above, it is not necessary to have a seam in the manhole conduit as in the case of cutting using a conventional arrowhead, and cutting of all manhole inner walls can be performed. It will be possible. Further, it is not necessary to perform unstable cutting as in the case of manually cutting, and since a large cutter can be used, all manhole inner walls can be cut. Furthermore, as the cutting machine frame is fixed on the road to perform cutting, it is possible to prevent the equipment from becoming large because it reliably receives the cutting reaction force, and it is possible to quickly inside the manhole with small and inexpensive equipment. The wall can be cut.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of an embodiment of the present invention.

FIG. 3 is a plan view of an embodiment of the present invention.

[Explanation of symbols]

 1 Paved Road Surface 2 Manhole 3 Inner Wall 4 Manhole Inner Wall Cutting Machine 6 Frame 7 Strut 8 Fixing Member 9 Fixing Plate 10 Rack 12 Support Arm 13 Hydraulic Cylinder 14 Rod 15 Manhole Inner Wall 17 Supporting Member 18 Blade Drive Motor 20 Internal Teeth 21 For Arm Rotation Motor 22 Gear 24 Drive sprocket 25 Arm 28 Driven sprocket 30 Chain 31 Blade

Claims (1)

[Claims] 1. A fixing member having a plurality of support arms radially provided with an abutting portion against the inner wall surface of the manhole, a supporting member rotatably provided about a central axis of the fixing member, and the fixing member fixed to the fixing member. A manhole inner wall cutting machine comprising: a supporting member rotating motor; a blade driving motor fixed to the supporting member; and a cutting blade rotatably provided on an arm fixed to the supporting member.