JPH0533599Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a cutting machine that cuts an inner wall of concrete for repairing tunnels such as large diameter concrete water pipes.

(Prior art) For example, tunnels such as concrete water pipes that lead water from dams, lakes, etc. to various reservoirs develop cracks over the years after construction. A new concrete layer is formed to a specified thickness and replenished. Conventionally, when cutting the inner wall for repairing such a concrete tunnel, a worker would either hold the breaker and cut it, or a guide rail similar in shape to the tunnel inner wall would be installed on the movable trolley and the guide rail would be cut. The inner concrete walls were cut using a cutting machine equipped with a concrete cutting device that could be moved freely along the rail.

(Problems to be solved by the invention) However, there were problems in that manual cutting of concrete inner walls was inefficient, and when cutting the upper surface of the inner walls, workability was poor. Also,
Since the cutting machine with the concrete cutting device attached along the guide rail is a special purpose machine, it cannot be used for other operations and is uneconomical.

(Means for Solving the Problems) In order to solve the above problems, the tunnel inner wall cutting machine of the present invention uses a pin hole for attaching the boom and a pin hole for attaching the boom cylinder in the main body of the hydraulic excavator. a bracket removably pinned so as to protrude from the bracket; a vertical rotation device attached to the front of the bracket;
a slide arm attached to the pivoted body of the swing device so as to protrude to one side and having a protrusion width display means; a concrete cutting device attached to the tip of the slide arm; and a slide arm attached to the pivoted body. and a centering roller which is attached to protrude from the opposite side of the protrusion direction so that the protrusion width can be adjusted, and has a protrusion width display means.

(Example) The details of the present invention will be explained below with reference to an example shown in FIGS. 1 to 4. FIG. 1 is a schematic diagram showing a tunnel inner wall cutting machine according to the present invention in a working state. As shown in FIG. 1, at the bottom of the tunnel 1, which has a circular cross-sectional shape, a running path for the tunnel inner wall cutting machine 4 is formed by an underframe 2 serving as a base and an H-shaped steel 3 placed horizontally on the underframe 2. A rail 5 is laid on top of the rail 5 on which a trolley 6 for transporting concrete chips cut by a cutting machine 4 is run. The tunnel inner wall cutting machine 4 is a hydraulic excavator 11
A slide arm 25 is attached via a swing device 21 to the tip of a bracket 12 that is attached to the upper rotating body so as to protrude forward, and a concrete cutting device 29 is attached to the tip of the bracket 12 so as to protrude from the other end of the slide arm 25. A centering roller 40 is attached to the cut surface 9 cut by the cutting device 29.
A new concrete layer 10 is formed by providing a formwork 8 so as to face it.

2 to 4 show the detailed structure of the tunnel inner wall cutting machine 4. As shown in FIG. It is removably pinned to the hydraulic excavator using the cylinder mounting pin hole 19 so as to project forward of the hydraulic excavator. A hydraulic unit 20 is mounted on the bracket 12 and includes a valve device for cutting the inner wall of concrete.

The swing device 21 attached to the front part of the bracket 12 is provided to enable the cutting device 29 to cut the entire circumference of the inner wall of the tunnel 1. 2
It has a swivel joint 23 that supplies hydraulic oil to a hydraulic actuator of a device attached to one pivoted body 24.

As shown in FIGS. 2 and 4, a slide arm 25 is attached to the pivoted body 24 so as to protrude to one side. The slide arm 25 is
An outer cylinder 26 with a rectangular cross section fixed to the rotated body 24
and an inner tube 27 having a rectangular cross section that is slidably fitted into the outer tube 26, and the piston rod is housed in these tubes 26 and 27, the tube end is pinned to the outer tube 26, and the piston rod is inserted into the inner tube. It consists of a hydraulic cylinder 28 for extending and retracting the slide arm pinned to a cylinder 27.

The tip of the slide arm 25, that is, the inner cylinder 27
A cutting device 29 for cutting concrete using a pin 30 is attached to the tip of the concrete. The cutting device 2
9 has a pair of cutting drums 32 rotated by a hydraulic motor 31. A large number of cutting bits made of cemented carbide or the like are attached around the drum 32, but they are not shown. 45 is a scale that displays the protrusion width of the slide arm 25.

At the other end of the slide arm 25, a telescoping mounting frame 33 for the centering roller 40 is attached to the outer cylinder 33 of the centering roller 40.
a to the slide arm 25 by welding or the like,
Moreover, the inner cylinder 33b is slidably fitted and attached to the outer cylinder 33a. 34 is a hydraulic cylinder that makes the inner tube 33b move in and out of the outer tube 33a, and the end of the tube is connected to the outer tube 33a with a pin 35.
The piston rod is connected and attached to a bracket 37 integral with the inner cylinder 33b by a pin 36, and the hydraulic cylinder 34 has a smaller diameter than the hydraulic cylinder 28 housed in the slide arm 25. ing.

The centering roller 40 is rotatably supported by a bracket 38 which is attached to the bracket 37 by upper and lower pins 39, 39. By removing the upper pin 39 that connects the bracket 38 to the bracket 37, the centering roller 40 can be placed in a hanging state as shown by the two-dot chain line a in FIG. At times, by leaving the centering roller 40 in the hanging state a, the protruding width of the centering roller 40 portion is made small to facilitate running. On both sides of the centering roller 40, scales 41 for displaying the protrusion width of the centering roller 40 are attached by fixing them with metal fittings 42 to the bracket 37 attached to the tip of the inner cylinder 33b. A sliding roller 43 is attached so as to have the same protruding width as the centering roller 40.

When using this tunnel inner wall cutting machine 4,
First, the cutting machine 4 is run on the H-shaped steel 3 and its position is adjusted so that the cutting drum 32 faces the area to be cut on the inner wall of the tunnel 1. and,
Centering work is performed so that the turning center of the turning device 21 is located at the center of the tunnel 1. In this centering work, the hydraulic cylinder 34 is extended so that the centering roller 40 comes into contact with the inner wall of the tunnel 1, and the protruding width of the centering roller 40 at this time is adjusted to a scale 41.
Then, the rotation position is changed by operating the rotation device 21, and the centering roller 40 is rotated around the entire circumference.
Find the protrusion width and correct the left and right misalignment by turning the swing device of the hydraulic excavator body. In addition, vertical alignment is normally possible by accurately setting the underframe 2 and H-shaped steel 3, but if the inner wall of the tunnel 1 is uneven and misalignment occurs in the vertical direction, Adjust the inclination of the hydraulic excavator 11 body using a jack or the like.

After performing such centering, the hydraulic cylinder 28 housed in the slide arm 25 is extended,
In order to cut the inner wall of the tunnel to the set cutting depth, first read the markings on the scale 45 when the cutting bit of the cutting drum 32 is in contact with the inner wall of the tunnel 1, and while extending the slide arm 25, Rotating the cutting drum 32 and cutting the scale 45
Cutting is performed until the value of becomes a predetermined value, and then the turning device 21 is operated to slowly turn the slide arm 25 while cutting the inner wall of the tunnel.

After cutting the predetermined portion in this way, the hydraulic excavator 11 is moved by the cutting width of the cutting drum 32.
Retract the main unit and perform the same operation.

In the above embodiments, the explanation was centered on a tunnel serving as a water conduit, but the present invention can be used for cutting an inner wall of a tunnel having a circular cross section or a circular upper part.

(Effects of the invention) As described above, the tunnel inner wall cutting machine of the invention uses a hydraulic excavator as a base machine, and instead of the front attachment for excavation, it has a bracket, a turning device, a slide arm, a cutting device, and a centering roller. The cutting attachments are compatible with each other, and can perform cutting operations more efficiently at twice the speed of conventional manual operations, and eliminate the scattering of cutting chips that would otherwise be generated by manual operations. The strain of working in a place with a poor work environment is also reduced. In addition, by attaching a standard excavation front attachment instead of the cutting attachment, it can be used as a hydraulic excavator, allowing more effective use of the machine and improving economic efficiency compared to conventional dedicated machines. .

[Brief explanation of the drawing]

Fig. 1 is a side view schematically showing an embodiment of the tunnel inner wall cutting machine according to the present invention in a working state, Fig. 2 is a front view of the tunnel inner wall cutting machine, and Figs. 3 and 4 are respectively the embodiments. They are a side view and a plan view.

Claims (1)

[Scope of utility model registration request] A bracket is removably pinned to the front of the hydraulic excavator using the boom mounting pin hole and the boom cylinder mounting pin hole on the hydraulic excavator body, and the vertical bracket is attached to the front of the bracket. A swing device, a slide arm attached to a rotated body of the swing device so as to protrude to one side and having a protrusion width display means, a concrete cutting device attached to a tip of the slide arm, and the rotated body A tunnel inner wall cutting machine comprising: a centering roller which is attached to project from the opposite side of the projecting direction of the slide arm so as to be adjustable in projecting width, and has a projecting width display means.