JPH028403A - Device and method of cutting pavement body - Google Patents

Abstract

PURPOSE:To attain cutting having excellent efficiency by turning a cutting section, to which a truncated cone-shaped truncated cone top face is disposed at a lowermost level, while using the perpendicular of the cutting section as the axis of rotation and revolving the cutting section centering around a horizontal axis approximately orthogonal to the progressive direction of a car. CONSTITUTION:A perpendicular 15c tying a truncated cone top face 15a and the base 15b of a truncated cone-shaped cutting section 15 is arranged to the cutting section 15 approximately vertically while the truncated cone top face 15a is disposed approximately horizontally at a lowermost level thereof. A hydraulic cylinder 7 elevating and lowering the cutting section 15, a second hydraulic cylinder 12 for rotation turning the cutting section 15, and a hydraulic motor 14 revolving the cutting section 15 while employing the perpendicular 15c as approximately the axis of rotation are installed to a cutter body 6. The perpendicular 15c of the cutting section 15 is set at an arbitrary angle to the surface of a pavement body D, and the pavement body D is cut. Accordingly, a cut surface can be cut selectively to a flat shape and a curved surface shape, thus improving the operating efficiency of cutting.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention provides a method for repairing and repairing a road, for example, when a pavement such as asphalt or concrete is damaged or when a water pipe or the like is buried below the pavement. The present invention relates to a cutting device and a cutting method for cutting.

<Prior Art> The structure of an asphalt paved road includes an asphalt surface layer, an asphalt base layer, and a roadbed formed in this order from the road surface, and furthermore, a roadbed is formed below the roadbed. When a water pipe or the like is buried, the water pipe or the like is usually buried in the roadbed. Therefore, in the burial work, after cutting and stripping the asphalt surface layer and the asphalt base layer by a predetermined width, the roadbed and roadbed below them are excavated and water pipes etc. are installed. Thereafter, subgrade soil, roadbed material, asphalt base layer material, and asphalt surface layer material are sequentially supplied to the excavated area to restore it to its original condition.

By the way, in the past, after cutting the asphalt surface layer and the asphalt base layer (hereinafter collectively referred to as asphalt pavement) to a sufficient depth with a disc-shaped diamond blade at predetermined intervals, the asphalt between the cuts was cut. The pavement is crushed and peeled off using a breaker. Here, the asphalt pavement is cut approximately vertically using a diamond blade. Further, the asphalt pavement is cut approximately perpendicularly by the diamond blade.

There is also a cylindrical drum cutter that cuts an asphalt pavement by positioning its cylindrical shaft substantially parallel to the surface of the asphalt pavement.

<Problems to be Solved by the Invention> However, in such conventional construction methods, the asphalt pavement is cut by arranging the diamond blade so that the plate surface of the diamond blade is approximately perpendicular to the surface of the asphalt pavement. Therefore, the asphalt pavement must be cut by moving the diamond blade straight in the direction of extension of the diamond blade, which causes the following problems.

In other words, when damage occurs locally on the road,
Since it is necessary to cut the area around the damaged part with a diamond blade along each side of the approximately square shape, and to cut the asphalt pavement by extending it from the corner of the square, work efficiency decreases and cracks may occur at the extended parts. There is a problem that it causes

Furthermore, when cracks occur in a continuous, undulating, curved manner on the road, the direction of movement of the diamond blade is changed multiple times to cut both sides of the crack, resulting in the same problem as described above. Similar problems also occurred in those using a cylindrical drum cutter.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a pavement cutting device that can cut curved damaged parts with good work efficiency.

Means for Solving the Problems> Therefore, in claim 1, the present invention provides a cutting section that is formed in a substantially truncated cone shape and cuts a pavement body by a perpendicular line connecting the top surface of the truncated cone and the bottom surface of the truncated cone. an elevating device for elevating and lowering the cutting section, the truncated conical top surface on the small diameter side being arranged to be substantially vertical, and the vertical line substantially rotating the cutting section and the perpendicular line; The vehicle is equipped with a rotation device that rotates the cutting portion as a shaft, and a rotation device that rotates the cutting portion about a substantially horizontal axis that is substantially perpendicular to the direction of travel of the vehicle.

Moreover, in claim 2, using the cutting part of claim 1,
The cutting part is rotated by a predetermined amount around a substantially horizontal axis that is substantially perpendicular to the direction of vehicle travel, and the cutting part is rotated by a predetermined amount while the perpendicular line connecting the truncated conical top surface and the truncated conical bottom surface is inclined with respect to the pavement surface. The vehicle is rotated about a perpendicular line as the axis of rotation, and the pavement is cut by moving the vehicle forward.

<Function> According to the first aspect, the perpendicular line of the cutting portion is set at an arbitrary angle with respect to the surface of the pavement, and the pavement is cut.

Further, in the second aspect of the present invention, the cutting portion is cut with its perpendicular line inclined at a predetermined angle with respect to the surface of the pavement.

<Example> Below, an example corresponding to claims 1 and 2 of the present invention will be described based on FIGS. 1 to 5.

1 and 2, a front wheel 2 and a rear wheel 3 are attached to a lower front end and a lower rear end of a vehicle frame 1, respectively. Front wheel 2 and rear wheel 3 steering mechanism (not shown)
is connected to. Steering device is front wheel 2 and rear wheel 3
The steering direction is opposite to that shown by the chain line in FIG. 2, so that the minimum turning radius of the vehicle is extremely small.

The front wheels 2 and rear wheels 3 are rotationally driven by a drive device (not shown).

An engine 4 is provided at the front of the vehicle frame 1, and the engine 4 drives the drive device and various devices described below. Further, a driver's seat 5 and a control panel (not shown) disposed in front of the driver's seat 5 are provided at the rear of the vehicle frame 1.

A cutting device main body 6 is provided on the side of the substantially central portion of the vehicle frame 1 . As shown in FIG. 3, this cutting device main body 6 is provided with a pair of lifting hydraulic cylinders 7 as a lifting device that are rotatably attached to the vehicle frame 1 in a vertical plane orthogonal to the vehicle traveling direction. It is being Also,
A pair of link members 8 are attached to the vehicle frame 1 so as to be able to rotate freely within the vertical plane, and the piston rod tip of the lifting hydraulic cylinder 7 is attached to the intermediate portion of the link members 8 in the vertical plane. It is mounted so that it can rotate freely within the plane.

Upper end portions of first brackets are attached to the other end portions of the link members 8 such that they can rotate freely within the vertical plane, and a first rotational hydraulic cylinder 10 is attached to the lower end portion of the first bracket 9.
are each mounted rotatably within the vertical plane. The piston rods of these first rotational hydraulic cylinders 10 are attached to the vehicle frame 1 so as to be freely rotatable within the vertical plane.

A second bracket 11 is provided on the side of the first bracket 9.
is rotatably attached to a horizontal shaft C extending in the vehicle width direction. A second rotating hydraulic cylinder 12 as a rotating device is attached to the first bracket 9 so as to be freely swingable.
The piston rod of the second rotational hydraulic cylinder 12 is connected to a connecting member 1 that is swingably attached to the second bracket eye 1.
It is attached to 3. The second bracket 11 is rotated about the horizontal axis C by operating the second rotation hydraulic cylinder 12.

A hydraulic motor 14 as a rotating device is attached to the second bracket 11 with its output shaft 14a being arranged substantially vertically. A truncated conical cutting part 15 for cutting the asphalt pavement is detachably attached to the lower end of the output shaft 14a with bolts, taper pins, etc., as shown in FIG. This cutting portion 15 has a truncated conical top surface 15a.
A perpendicular line 15c connecting the truncated cone and the truncated cone bottom surface 15b is arranged substantially vertically, and the truncated cone top surface 15a is arranged substantially horizontally at the lowest point.

A plurality of holders 16 are attached in three spiral shapes at a predetermined pitch to the truncated conical top surface 15a and outer circumference 15d of the cutting portion 15, and bits 17 made of a cemented carbide member are attached to these holders 16, respectively. There is.

Here, the diameter DT of the truncated conical top surface 15a of the cutting member 15 is formed to be 300 mm, and the diameter DB of the truncated conical bottom surface 15b is formed to be 400 mm. In addition, the truncated conical top surface 15a
The height H from to the bottom surface L5b of the truncated cone is 80 mm. Therefore, the size ratio between the diameter DT and the height H of the truncated conical top surface 15a is set to 15/4. Also,
The angle θ between the truncated cone top surface 15a and the outer circumference 15d is approximately 6.
It is formed at 0°.

Next, the action will be explained.

The link member 8 is rotated counterclockwise in FIG. 6 about one end by the lifting hydraulic cylinder 7, and the first bracket 9 is moved downward. Further, the first bracket 9 is rotated clockwise by the rotating hydraulic cylinder 10 around the tip of the piston rod of the lifting hydraulic cylinder 7.

In this way, the cutting part 15 is positioned so that the perpendicular line 15c of the cutting part 15 is substantially orthogonal to the surface of the asphalt pavement.

Then, the hydraulic motor 14 rotates the cutting part 15 around the perpendicular line 15c and moves it downward, and the pinto 17 cuts the asphalt pavement.

Then, while cutting the asphalt pavement body, the cutting part 15
is lowered, and when the truncated conical bottom surface 15c of the cutting portion 15 reaches the surface of the asphalt pavement as shown in FIG. 6, the lowering of the cutting portion 15 is stopped.

Then, the vehicle is moved forward while rotating the cutting part 15.

In this way, the asphalt pavement is cut by turning the conical cutting part 15 with its conical top surface 15a facing downward and rotating it around its perpendicular line 15c. The asphalt pavement can be cut by the bit 17 having the conical top surface 15a and the outer peripheral part 15d without moving the cutting part 15 vertically and horizontally on the surface of the asphalt pavement. At this time, the conical top surface 15a
The pavement is formed into a flat shape.

Specifically, for example, when repairing around a manhole and constructing buried pipes near the manhole, the cutting section 15 is moved linearly as shown by the solid line in FIG. 7 to cut the asphalt pavement. When approaching the manhole, the vehicle is rotated around the manhole and the cutting part 15 is rotated.
The asphalt pavement is cut so that the cutting path becomes a circular shape centered on the manhole. Further, the asphalt pavement is cut with a predetermined width and a line symmetry with the cutting trajectory.

Therefore, since the asphalt pavement can be continuously cut by the cutting part I5, the extension part that occurs in the past does not occur, and it is possible to prevent the occurrence of cracks etc. after repair. can be significantly improved.

Moreover, since the cut surface that remains after cutting is inclined upward, and the bits 17 are arranged at a predetermined pitch, the cut surface is formed to have an uneven shape in the vertical direction. As a result, the area of the cut surface is significantly increased compared to the conventional one, so the contact area between the new asphalt mixture and the old asphalt mixture is significantly increased, and the adhesion between them can be significantly improved.

In addition, since the cut surface faces upward, the new asphalt mixture is placed on top of the old asphalt mixture, which significantly increases the structural strength of the new asphalt mixture against external forces from above at the cut part. can be improved.

Further, when cutting the cut surface of the pavement into a curved surface, the second bracket 11 and the cutting part 15 are rotated by a predetermined amount clockwise in FIG. 1 about the horizontal axis C by the second rotation hydraulic cylinder 12. . As a result, the perpendicular line 15c of the cutting portion 15 is inclined at a predetermined angle α with respect to the pavement surface, as shown by the solid line in FIG.

In this state, when the vehicle is moved forward while rotating the cutting part 15 about the perpendicular line 15c, the cut surface of the pavement body is formed into a curved shape with a concave central part, as shown by the solid line in FIG. Both side walls are formed to be inclined. Therefore, this device is also effective when cutting a pavement into a curved shape while producing the same effects as described above.

Further, when the dimensional ratio of the diameter of the conical top surface 15a and the height H from the top surface 15a to the conical bottom surface 15a is set to 15/4, and the angle θ is set to about 60', the cutting portion 15
Vibration during cutting can be suppressed, and bouncing of the cutting part 15 in the vertical direction can be reduced. Therefore, the cutting part 15 can cut stably, the cutting ability is improved, and cutting can be performed with raw horsepower.

Incidentally, even if the angle θ is formed in the range of 40° to 60° and the size ratio is formed in the range of 2/1 to 4/1, vibration of the cutting part 15 can be suppressed and the vibration in the vertical direction can be suppressed. It has been experimentally verified that bounce can be reduced.

In addition, when damaged parts such as cracks occur in a continuous, undulating, curved shape, the asphalt pavement can be cut in an arbitrary curved shape along the damaged part by moving the vehicle while changing the direction of travel. can.

<Effects of the Invention> As explained above, in the present invention, in claim 1, a substantially conical cutting part is disposed with the top surface of the cone being at the lowest position, and the cutting part is rotated about a perpendicular line as a rotation axis. The present invention provides a cutting device that rotates the cutting section about a horizontal axis that is substantially orthogonal to the direction of vehicle travel, so that the cut surface of the pavement can be selectively formed into a flat shape or a curved shape, It is possible to stably cut the pavement without creating any extensions, prevent the occurrence of cranks, etc. after repair, and improve cutting work efficiency and cutting ability.

In addition, in claim 2, a cutting method is provided in which the pavement is cut with the perpendicular line of the cutting part of claim 1 inclined at a predetermined angle with respect to the surface of the pavement, so that the cut surface of the pavement is curved. Not only can it be cut into a shape, but it can also prevent the occurrence of cranks, etc. after repair.

[Brief explanation of the drawing]

FIG. 1 is a side view of a cutting device showing one embodiment of the present invention, the second is a schematic plan view of the same, and FIG. 3 is an enlarged view of the main parts of the same.
FIG. 4 is an enlarged view of another main part same as above, FIG. 5 is a bottom view of FIG. 4, and FIGS. 6 to 9 are diagrams for explaining the operation of same as above. 1... Vehicle frame 7... Hydraulic cylinder for lifting 10... First hydraulic cylinder for rotation 12... Second hydraulic cylinder for rotation 14... Hydraulic cylinder... Cutting part

Claims (2)

[Claims] (1) A cutting part formed in a substantially truncated cone shape and for cutting the pavement is arranged so that the perpendicular line connecting the top surface of the truncated cone and the bottom surface of the truncated cone is substantially perpendicular, and the top of the truncated cone on the small diameter side an elevating device disposed such that the surface thereof is at the lowest position and that raises and lowers the cutting section; a rotating device that rotates the cutting section about the perpendicular line as an axis of rotation; a rotation device that rotates around orthogonal substantially horizontal axes;
A pavement cutting device characterized in that a vehicle is equipped with: (2) A substantially conical cutting section that is installed on the vehicle and cuts the pavement so that the top surface of the truncated cone on the small diameter side is at the lowest position is rotated a predetermined number of times around a substantially horizontal axis that is substantially perpendicular to the direction of vehicle travel. cutting the pavement by moving the vehicle while rotating the cutting part about the perpendicular line as a rotation axis with the perpendicular line connecting the top surface of the truncated cone and the bottom surface of the truncated cone inclined with respect to the surface of the pavement body; A method for cutting a pavement body characterized by: