JP2528787B2 - Road surface cutting method and road surface cutting device - Google Patents

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 cutting a road surface paved with concrete or asphalt into a plane circular shape.

[0002]

2. Description of the Related Art As a device for cutting a road surface around a manhole or the like into a plane circular shape, a method of rotating a cylindrical cutter around a vertical axis or a disk disclosed in Japanese Utility Model Publication No. 62-19687. There is a method using a circular blade or a method using a spherical crown blade disclosed in JP-A-63-55204.

However, among the above-mentioned methods, the one using a cylindrical cutter is disadvantageous in that the cutter has a large diameter and a supporting device and a rotary driving device for rotatably supporting the cutter are large in size, which is difficult to handle and costly. Is to have. Further, the method using the disc-shaped blade is performed while the disc-shaped blade, which is originally intended to be cut linearly, is forcibly moved along the circular locus by the guide device so that the cutting depth is deep. When the cutting diameter is small (for example, 1 to 2 m), the blade interferes with the wall surface of the cutting groove and may be bent or damaged, which is dangerous and cannot be put to practical use.

Further, in the method using the spherical crown blade,
Since the arm connected to the blade via the drive portion is directed obliquely upward toward the upper end of the column, the cutting surface by the blade is also a partially spherical surface inclined about the upper end of the column. (Spherical shape), it is difficult to measure the cutting depth, and weak points are formed in the pavement. That is, the surface layer, the base layer, the upper layer, the lower layer, and the roadbed that form the pavement structure support the load from above and transmit the load that cannot be supported to the lower layer, so the strength of each layer must be uniform. The phenomenon of destruction from weak points occurs. Therefore, as shown in FIG. 9, when the existing pavement 91 is cut by the above-mentioned inclined partial spherical cutting surface 92, the existing pavement 91 becomes thin in the portion of the area S shown in the drawing, and a different paving material is placed on this. Even if the new pavement 93 is formed by using the new pavement 93, the material and strength of the area in the range S become non-uniform, and the area is easily broken. For this reason, in general, the specifications for paving work stipulate that cutting should be performed at a right angle to the road surface, and the above-mentioned cutting method using a spherical crown blade cannot satisfy this stipulation.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art. Even when the diameter of the cutting circle is relatively small, the blade is not damaged and is substantially perpendicular to the road surface. An object of the present invention is to provide a road surface cutting method and a road surface cutting device capable of cutting a road surface with a smooth cutting surface.

[0006]

SUMMARY OF THE INVENTION A road surface cutting method according to the present invention comprises a longitudinal section consisting of a conical surface plate portion and a top plate portion each having a truncated cone shape similar to a spherical crown body obtained by cutting a part of a spherical surface having a radius R with a flat surface. A cutter is used in which a tip having a width wider than the plate thickness of the conical plate is fixed to the peripheral edge of the trapezoidal blade, and the concave side of the cutter is set to the rotation center line side on the road surface. The top plate portion is attached to a rotation drive shaft that is directed to the center line, the lower edge of the cutter is located at a road surface position having a radius R from the rotation center line, and the longitudinal section of the conical surface plate portion on the road surface side is the road surface. The rotary drive shaft is tilted so as to be substantially perpendicular to it, and the cutter is rotationally driven to lower it to a predetermined cutting depth, and then the cutter is rotated about the rotation center line, The feature is that the road surface is cut into a plane circle.

Further, the road surface cutting device of the present invention is rotatably supported by the traveling wheel rotatably supported on the chassis by the axle oriented on the rotation center line on the road surface and the axle oriented on the rotation center line. And a sub-wheel for adjusting the cutting depth, which is attached to the chassis so as to be adjustable in upper and lower directions, and is rotatably mounted on the road surface around the rotation center line. , A plate of the conical surface plate portion at the peripheral portion of a blade having a trapezoidal longitudinal cross section, which is composed of a conical surface plate portion having a truncated conical surface shape and a top plate portion which is similar to a spherical crown body in which a part of a spherical surface having a radius R is cut in a plane. A cutter that is formed by fixing chips having a width wider than the thickness, and that has the concave surface side as the rotation center line side and the top plate portion is attached to a rotation drive shaft that is oriented to the rotation center line that is rotationally driven by a drive machine. And the longitudinal direction of the conical plate portion on the road surface side, which is provided on the chassis. The rotary drive shaft is inclined obliquely downward toward the rotation center line so that the surface is substantially perpendicular to the road surface, and the lower edge of the cutter in the inclined state is a radius R from the rotation center line. And a cutter support device for supporting the vehicle at the road surface position.

The cutter supporting device in the road surface cutting device of the present invention is mounted on a chassis so as to be swingable around a center line extending in a direction perpendicular to the rotary drive shaft, and the rotary drive shaft is adjustable in inclination angle. A tilting angle variable type including a tilting platform that supports the tilting platform and a tilting angle adjusting mechanism for adjusting a tilting angle of the tilting platform with respect to the chassis, and a rotary drive shaft fixedly mounted on the chassis to maintain a predetermined tilting angle. Any of the fixed tilt angle type consisting of a fixed base can be used, but in the former case of the variable tilt angle type, cutting is performed while finely adjusting the tilt angle of the rotary drive shaft and cutter when the road surface is not horizontal. By doing so, a cutting surface perpendicular to the road surface can be obtained.In addition, by changing the orientations of the axles of the traveling wheels and auxiliary wheels, the cutter can be replaced to change the cutting diameter of the road. It is convenient because it is possible to perform cutting. The latter fixed tilt angle type is exclusively for cutting road surfaces with a constant cutting diameter, but it has excellent workability because it does not require adjustment of the tilt angle of the rotary drive shaft and cutter at the construction site.

In the longitudinal sectional shape of the cutter according to the present invention, as shown in FIG. 6, the width L of the conical surface plate portion 34 of the blade 36 including the height of the tip 37 is such that the top plate portion 35 and the cutting groove 70. In order to avoid interference, it is better to be larger than the cutting depth H. If the diameter D of the blade 36 is too large, the degree of approximation between the spherical cap 33 and the conical surface plate portion 34 decreases, causing interference between the conical surface plate portion 34 and the wall surface of the cutting groove 70 and increasing the size. However, if the cutting depth H is too small, the cutting depth H cannot be made large. Therefore, according to the inventor's knowledge, 0.5R ≦ D with respect to the radius R of the cutting circle (= radius of the spherical surface 31). It is preferable that ≦ 0.75R.

[0010]

According to the method of cutting a road surface of the present invention, as shown in FIG. 6, a cutter 30 in which a tip 37 is fixed to a blade 36 having a trapezoidal vertical cross section has a vertical cross section of a conical plate portion 34 on the road surface side. Rotation drive shaft 43 so that it is substantially perpendicular to
Is inclined obliquely downward toward the rotation center line 3, and is driven to rotate around the rotation center line 3 by cutting into the road surface 2 at a position of a radius R from the rotation center line 3. A spherical surface 31 centered on the center Q located below the road surface 2
By rotating the conical surface plate portion 34 about the rotation center line 3 similar to the above, a cutting groove 70 having a plane circular shape with a radius R centering on the rotation center line 3 and being substantially perpendicular to the road surface 2 is formed.

The conical plate portion 34 of the blade 36 is a spherical surface 31.
(Specifically, a spherical crown 33, which is obtained by cutting the spherical surface 31 with a flat surface 32)
The width W of the cutting groove 70 is smaller than the width t of the tip 37 and the plate thickness of the conical plate portion 34 is smaller than this width t in addition to having a shape similar to
No contact with the wall surface of 0, and even if the radius of the cutting circle is relatively small as R = 500 to 600 mm, it causes abnormal wear and damage of the blade as when using a disc-shaped cutter. The road surface can be cut smoothly without any problems.

Further, in the road surface cutting device of the present invention,
With respect to the circular rotation center line of radius R to be cut on the road surface, the cart is moved so that the cutter drive shaft is directed to the rotation center line and the lower edge of the cutter is in contact with the road surface at the radius R. When the cutter is positioned above and the cutter is rotationally driven by the driving machine to lower the cutter, the cutter is cut substantially in the direction perpendicular to the road surface.

When the auxiliary wheel maintains this cutting amount at a predetermined amount and the carriage is moved forward by a manual drive or the like, the traveling wheel and the auxiliary wheel whose axles are oriented to the center line of rotation rotate around the center line of rotation. While traveling on a road surface along a circular locus, the carriage and the cutter are rotated around the rotation center line, and the cutter itself having the tip fixed to the conical surface plate portion having a radius R of a spherical surface also turns and moves at the radius R. There is a tendency (when turning with a radius of curvature other than the deformation R, the tip that has passed through the lowest point interferes with the groove wall surface of the cut groove that has already been cut, and the cutting resistance increases. It tends to be automatically corrected in the turning direction), and the radius R centered on the rotation center line
That is, a cutting groove is formed which is continuous with the plane circle and is substantially perpendicular to the road surface.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 denotes a road surface cutting device placed on a road surface 2. A cutter driving device 40 having an engine as a power source is mounted on a carriage 10 via a cutter supporting device 50, and the cutter driving device is rotated. The cutter 30 is mounted on the drive shaft 43. 1 to 3 show the center line 3 of rotation set on the road surface 2.
3 shows a state (hereinafter referred to as a set state) in which the road surface cutting device 1 is set on the road surface 2 in order to cut the road surface 2 along a circle 4 having a radius R centered at.

The dolly 10 has a handle 12 for manual pushing operation fixedly mounted on the rear end of a flat plate-shaped chassis 11, and two traveling wheels 14, on a leg 13 fixed below the rear part of the chassis 11. 15
And a sub-wheel 17 for adjusting the cutting depth is rotatably supported on the lower portion of the telescopic leg 20 which is fixed to the front part of the chassis 11 via the arm 16.

The telescopic leg 20 has a double prismatic tubular structure in which an outer cylinder 21 fixed to the arm 16 is slidably fitted with an inner cylinder 22 which pivotally supports the auxiliary wheel 17. The male screw portion of the screw rod 24 rotatably supported by the end plate 23 of the upper end portion of 21 is screwed into the end plate 25 fixed to the upper end portion of the inner cylinder 22, and the handle 26 is attached to the upper end portion of the screw rod 24. The inner cylinder 22 is fixed by being fixed, and the handle 26 is manually rotated.
Is driven to retract upward with respect to the outer cylinder 21, and the cutter 30 is moved by a distance corresponding to the retracted amount (shortened amount of the telescopic leg 20).
Is cut into the road surface 2 and the bogie 10 is moved forward while maintaining the cut amount constant, thereby cutting at a constant cutting depth.

As shown in FIG. 1, the traveling wheels 14, 15 and the auxiliary wheel 17 of the carriage 10 are arranged so that the axles 14a, 15a and 17a of the axles are oriented to the rotation center line 3. The orientation of is set. Note that, due to the cutting of the cutter 30, the chassis 11 tilts forward, so strictly speaking, each of the above-mentioned axes deviates from the rotation center line 3 by a small amount, but the distance between the front and rear axes is smaller than the cutting depth. If it is large to some extent, the amount of deviation is small, and the carriage 10 travels substantially along a circular locus around the rotation center line 3 due to the rolling of each wheel.

Next, as shown in FIGS. 6 and 7, the cutter 30 approximates to a spherical crown body 33 obtained by cutting a part of a spherical surface 31 having a radius R equal to the radius of the road cutting circle 4 with a plane 32. A metal plate (for example, a steel plate) having a trapezoidal vertical cross section, which includes a conical surface plate portion 34 and a circular flat plate-shaped top plate portion 35.
A plurality of chips 37 made of a hard material (for example, a sintered body of diamond and metal) are arranged in a circular shape with a gap 38 and welded to the peripheral edge of a blade 36 made of. Chip 3
The width t of 7 is larger than the plate thickness of the conical surface plate portion 34, and the side portions of the tip 37 project to both sides of the conical surface plate portion 34. Three
Reference numeral 9 denotes a mounting hole for inserting a bolt for mounting the cutter 30 on the rotary drive shaft 43. The cutter driving machine 40 includes a rotary drive shaft 4 at the tip of an arm 42 fixed to a casing 41.
3 is rotatably attached and is a chain built in the arm 42
The rotation of the engine in the casing 41 is transmitted to the rotation drive shaft 43 by the drive mechanism. Note that the illustration of the chip 37 is omitted in the drawings other than FIGS. 6 and 7.

The cutter supporting device 50 comprises a flat plate-shaped tilting base 51 for supporting and mounting the cutter driving machine 40 on the upper surface thereof, and a tilt angle adjusting mechanism 55 for adjusting the tilt angle of the tilting base 51. As shown in FIG. 4, the tilting base 51 has a hinge mechanism 52 at one end of the chassis 11 and a rotary drive shaft 43 of the cutter driving machine 40 (directed to the rotation center line 3 in a set state as described later). Is swingably supported about a swing center line 54 extending in a direction perpendicular to

The tilt angle adjusting mechanism 55 has an intermediate portion of a screw rod 58 penetrating through elongated holes 56 and 57 provided in the tilt base 51 and the chassis 11 and extending in the chassis width direction (direction of arrow X in FIG. 4). A screw rod 58 of a screw rod 58 is screwed into a nut 64 (see FIG. 5) that is swingably supported by pins 62 and 63 around a support shaft line 61 parallel to the swing center line 54 in an annular body 60 fixed to the lower surface of 51. The tilt angle of the tilting table 51 is adjusted by manually rotating the handle 65 fixed to the upper end, and then the nuts 66 and 67 for locking are tightened.
The tilt angle is kept constant. 68
Is a pin penetrating the lower end of the screw rod 58.

The cutter driver 40 is mounted on the tilting base 51.
Is attached to the rotary drive shaft 43 of the cutter driving machine 40.
The blade 3 of the cutter 30 is attached to the mounting plate portion 43a at the tip of the blade.
The top plate portion 35 of 6 is fixed by tightening. The attachment position of the cutter driving machine 40 to the tilting base 51 and the rotary drive shaft 4 are fixed.
The lengths of 3 are respectively set so that the lower edge of the cutter 30 comes to a position of a distance R from the rotation center line 3 in the set state described later.

A road surface 2 is formed by using the road surface cutting device 1 having the above structure.
In order to cut, the circle 4 having the radius R and the position of the rotation center line 3 is drawn on the road surface 2 with a circular ruler and a marking choke as shown in FIG. And the handle 26 of the telescopic leg 20
By adjusting the vertical position of the auxiliary wheel 17 by operating the tilt wheel 51, and by adjusting the tilt angle of the tilting base 51, that is, the rotary drive shaft 43 by operating the handle 65 of the tilt angle adjusting mechanism 55, the cutter 3 can be operated.
0 so that the lower edge (outer periphery of the tip 37) is almost in contact with the road surface 2 and is located below the cutter 30.
The cutter 30 is positioned so that an angle α (see FIG. 3) formed by the vertical cross section 4 (a vertically downward generating line of the conical surface) and the road surface 2 is substantially right angle.

The orientation and position of the carriage 10 in this positionally adjusted state are set so that the rotation center axis line 44 of the rotary drive shaft 43 is directed to the rotation center line 3 and below the cutter 30, as shown in FIG. The edge (chip 37) is positioned so that it is located on the circle 4, and the edge is set. After that, the cutter 30 is rotationally driven by the cutter driving machine 40, and the handle 2
When the cutter 30 is lowered while the telescopic leg 20 is being contracted by the operation of 6 and cuts into the road surface 2, and when the predetermined cutting depth H is reached, the trolley 10 is moved forward by operating the handle 12, and the trolley 10 becomes a traveling wheel. 14 and 15 and the auxiliary wheel 17 travel around the rotation center line 3 in a substantially circular trajectory, and the cutter 30 rotates around the rotation center line 3 in a circular orbit having a radius R. The road surface 2 is cut into a circle.

In this cut state, the tips 37 arranged on the circumference of the cutter 30 are part of the spherical surface 31 centered on the center Q located below the road surface 2 on the rotation center line 3 in FIG. As it rotates about the rotation center axis 44 and turns about the rotation center line 3, a substantially vertical cutting groove 70 having a width W slightly smaller than the width t of the tip 37 is formed on the road surface 2. Further, since the conical surface plate portion 34 is near the center of the cutting groove 70 and is a plate-shaped body thinner than the width t of the tip 37, the conical surface plate portion 34 hardly contacts the wall surface of the cutting groove 70. The road surface can be cut without damaging or wearing the blade 36.

With the above road surface cutting device 1, the radius R = 5
In order to cut the road surface 2 into a circle of 15 mm, as a truncated cone surface shape approximate to the spherical crown body 33 of the spherical surface 31 of radius R = 515 mm shown in FIG. 6, D = 350 mm, d = 110 mm, trapezoid height h = 28 mm (In this embodiment, each value is detailed in detail.
Blade 36 with a trapezoidal vertical cross section (value between the tip edge corner and the bent corner on the convex side of the blade) (JIS standard S4 with a plate thickness of 2.5 mm)
7mm wide, 6mm high, 40mm long on the outer circumference of 5C steel plate)
Using a cutter 30 formed by fixing 24 pieces of diamond and metal sintered bodies 37 by welding, in the set state, the tip 37 (in this embodiment, the tip 3 will be described in detail).
The outer side surface 37a of 7 is located on the circle 4 having a radius R = 515 mm, and the cutting is performed according to the above process. While forming, the road surface 2 could be cut in a circular shape (radius in the outer diameter portion of the cutting groove 70 = about 515 mm).

The present invention is not limited to the above-described embodiment, and for example, the specific shapes and structures of the carriage 10, the cutter 30, the cutter driving device 40, the cutter supporting device 50, etc.
Other than the above may be used. When the diameter of the circle 4 to be cut is one type, the tilt angle adjusting mechanism 55 may be omitted and the tilting base 51 may be fixed to the chassis 11 at a constant tilting angle. See also Blade 36
The approximation to the spherical crown body 33 may be performed on the concave surface side of the blade 36.

When one road surface cutting machine is used to cut a circle 4 having a plurality of types of diameters, a plurality of types of cutters 30 corresponding to the radii are prepared and replaced, and the traveling wheels 14, The directions of the axes 14a, 15a and 17a of the auxiliary wheel 15 and the auxiliary wheel 17 in FIG. 1 may be attached to the leg 13 or the inner cylinder 22 so as to be switched according to the radius. FIG. 8 shows an example of a wheel support structure in which the direction of the axis can be switched.
Alternatively, in a caster-type wheel support structure 80 in which a wheel 82 is rotatable with a bracket 83 around a vertical axis with respect to a mounting plate 81 which is bolted to the inner cylinder 22,
The turning center 8 is attached to the side plate 84 fixed to the side of the mounting plate 81.
5, a plurality of holes 86 are formed on the circumference, and a bolt 89 for positioning that is screwed into one screw hole 88 provided in the swivel plate 87 fixed to the bracket 83 is inserted into which hole 86.
The direction of the axis line 82a of the wheel 82 is switched depending on whether or not the wheel 82 is inserted.

[0028]

As described above, according to the present invention,
Even if the diameter of the cutting circle is relatively small, it does not cause damage to the blade, and the cutting surface is almost perpendicular to the road surface.
The road surface can be cut.

[Brief description of drawings]

FIG. 1 is a plan view of a road surface cutting device showing an embodiment of the present invention.

FIG. 2 is a side view taken along the line AA of FIG.

FIG. 3 is a side view taken along the line BB of FIG.

4 is a cross-sectional view taken along the line CC of FIG.

5 is a cross-sectional view taken along line DD of FIG.

6 is a vertical cross-sectional view showing a cut state of a road surface by the device of FIG.

FIG. 7 is a front view of the cutter 30 in FIG.

FIG. 8 is a perspective view showing another embodiment of the support structure for the wheels of the truck according to the present invention.

FIG. 9 is a vertical cross-sectional view showing a cut state of a road surface by a conventional cutting method.

[Explanation of symbols]

1 ... Road surface cutting device, 2 ... Road surface, 3 ... Rotation center line, 4 ...
Yen, 10 ... dolly, 11 ... chassis, 14 ... running wheel, 14a
... Axis, 15 ... Running wheel, 15a ... Axis, 17 ... Secondary wheel, 17a ... Axis, 20 ... Telescopic leg, 26 ... Handle, 3
0 ... Cutter, 31 ... Spherical surface, 32 ... Plane, 33 ... Spherical cap,
34 ... Conical surface plate part, 35 ... Top plate part, 36 ... Blade, 3
7 ... Tip, 38 ... Clearance, 40 ... Cutter drive machine, 43
... rotary drive shaft, 44 ... rotation center axis line, 50 ... cutter support device, 51 ... tilting base, 54 ... swing center line, 55 ... tilt angle adjusting mechanism, 58 ... screw rod, 64 ... nut, 65 ... handle, 70 ... Cutting groove, 80 ... Wheel support structure, 82 ... Wheel, 82a ... Axis.

Claims (4)

(57) [Claims] 1. A cone having a trapezoidal vertical cross section, which is composed of a conical surface plate portion having a truncated cone shape and a top plate portion, which is similar to a spherical crown body in which a part of a spherical surface having a radius R is cut in a plane, and the cone is formed in the peripheral portion. A cutter formed by fixing chips having a width wider than the plate thickness of the face plate portion is used, and the top plate portion is attached to a rotary drive shaft that is directed to the rotation center line with the concave side of the cutter as the rotation center line side on the road surface. The lower edge of the cutter is located at a road surface position having a radius R from the rotation center line, and the rotary drive shaft is mounted so that the vertical cross section of the conical surface plate portion on the road surface side is substantially perpendicular to the road surface. A road surface characterized by cutting the road surface into a plane circle by inclining and driving the cutter to lower it to a predetermined cutting depth and then rotating the cutter around the rotation center line. Cutting method. 2. A traveling wheel rotatably supported on a chassis by an axle oriented on a rotation center line on a road surface, and a traveling wheel rotatably supported by an axle oriented on the rotation center line and vertically on the chassis. A trolley mounted on a road surface so as to be rotatable about the rotation center line, and a spherical wheel having a radius R. A chip having a width wider than the plate thickness of the conical plate is fixed to the peripheral edge of a blade having a trapezoidal vertical cross section, which is composed of a conical plate having a truncated cone shape and a top plate, which are similar to a spherical crown body obtained by cutting the part in a plane. A cutter attached to a rotary drive shaft that is directed to the rotation center line that is rotationally driven by a drive machine, and the top plate is provided on the chassis. The longitudinal section of the conical plate on the road surface is almost perpendicular to the road surface. Cutter support device for inclining the rotary drive shaft diagonally downward toward the rotation center line and supporting the lower edge of the cutter in the inclined state at a road surface position having a radius R from the rotation center line. A road surface cutting device comprising: 3. A tilting base, wherein the cutter supporting device is mounted on a chassis so as to be swingable about a center line extending in a direction perpendicular to the rotary drive shaft, and supports the rotary drive shaft so that the tilt angle can be adjusted. The road surface cutting device according to claim 2, comprising a tilt angle adjusting mechanism for adjusting a tilt angle of the tilting platform with respect to the chassis. 4. The road surface cutting device according to claim 2, wherein the cutter support device comprises a fixed base fixed to the chassis to hold the rotary drive shaft at a predetermined inclination angle.