JP2010031627A - Road surface cutting apparatus and cutter blade for cutting road surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road surface cutting apparatus of excellent versatility capable of moving a rotary blade in a desired direction to cut a road surface in linear shape, circular arc shape, a combined shape of a straight line and a circular arc, or the like by selecting and changing components according to a shape to be cut, and excelling in environmental protection and resource saving properties by efficiently cutting the circumference of an installed object on a road surface without loss to minimize a cutting range and to reduce the amount of materials such as waste of asphalt or the like, a base course material required for repair, or the like. <P>SOLUTION: The road surface cutting apparatus comprises a rotary blade driving part detachably mounted with the rotary blade formed in truncated cone shape or disk shape; a frame having a lifting mechanism for holding the rotary blade driving part in a vertically movable manner; moving wheels disposed at the bottom part of the frame; a tilt holding mechanism for holding the rotary blade driving part tiltably to the lifting mechanism; and an attachment arm fixing part formed at the frame to fix an attachment arm for regulating the moving direction of the frame. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In the present invention, when cutting a paved road surface or the like, by selecting and exchanging parts, the rotary blade is moved along the shape to be cut, and the road surface is linear, arcuate, or a combination of a straight line and an arc. The present invention relates to a road surface cutting device that can cut the road surface into a circular arc shape with a desired radius.

Surrounding paved road surfaces such as manholes and information boxes installed on paved roads are susceptible to deterioration such as depression, subsidence, generation of cracks, or damage due to the influence of vibration of a traveling vehicle or aging. Moreover, when exchanging iron covers and frames such as manholes and information boxes, it is necessary to adjust the height with the surrounding paved road surface. In the conventional cutting process as a method for repairing these paved road surfaces, the surrounding paved road surfaces such as manholes are cut into quadrangular shapes or the like by a linear cutter that rotates a disk-shaped rotary blade with respect to the horizontal axis.
However, when cutting the paved road surface into a square shape with a straight cutter, in order to cut the paved road surface to the required depth, it is necessary to advance the rotation axis of the linear cutter to the position of each vertex of the square shape. Since it exceeds each vertex position, the corner has been cut off. This extra cutting not only makes the appearance worse, but also reduces the strength of the paved road surface. There was a problem that cracks and the like were easily generated and durability was lowered.
Moreover, not only the amount of waste such as asphalt generated by cutting, but also the amount of materials such as roadbed materials required for repairs increased, and there was a problem that environmental protection and resource saving were lacking.

Therefore, a circular cutter for cutting the periphery of the manhole into a circle has been proposed, and various devices have been devised.
For example, (Patent Document 1) states that “a fulcrum member that is fixed at an arbitrary position on the pavement surface and serves as a fulcrum, and a fulcrum member is provided at an end in the extending direction. A base that can move on a circumference drawn with a radius centered on a fulcrum member, a cutting drive source support member that can be tilted with respect to the base, and a cutting drive source support member And a rotary blade that is detachably attached to the cutting drive source and is driven to rotate. The rotary blade has a straight blade surface in a cross section along the rotation axis. The blade surface is a frustoconical shape that bulges outward with respect to the fulcrum, and is mounted on a cutting drive source so as to cut the pavement surface with the blade surface. A paving surface cutting apparatus having a cutting blade on the surface is disclosed.
In addition, (Patent Document 2) states that “the rotation support portion provided at the substantially central portion of the airframe formed in a substantially rectangular frame is supported on the support shaft of the fixed base fixed to the road surface to support the airframe in rotation. A pivoting means that pivots about the section, and a cutting means that is mounted on the fuselage and that cuts the road surface into a circular shape by pivoting the fuselage, and the pivoting means is in the vicinity of one side frame in the front frame of the fuselage The cutting means has a lifting device mounted on one side frame and a rotary blade that is lifted and lowered by the lifting device. In addition to being disposed on the outside of the lifting device main body, the mounting surface is formed on an inclined surface that is inclined downward, and has an inclined mounting base that is guided by the lifting device main body to move up and down. It is formed in the shape of a dish and the convex surface is located outward from the aircraft, One lower half in longitudinal section shape is Kenbashira for road cutter is mounted to the inclined mount to exhibit a substantially vertical shape "is disclosed.
Japanese Patent No. 36553236 Japanese Patent No. 4030811

However, the above conventional techniques have the following problems.
(1) Both (Patent Document 1) and (Patent Document 2) cut the paved road surface into a circular shape, which is suitable when cutting around a circular installation such as a manhole. It was not suitable for cutting the periphery of a rectangular installation, and had a problem of lacking versatility.
In addition, it is necessary to cut the road surface in a straight line when installing manholes, burying pipes such as gas pipes and water pipes, and repairing or inspecting pipes that have already been buried. However, in such a case, it is not possible to cope with it, so it is necessary to prepare a cutter for straight line cutting, etc., which complicates the work process, lacks workability and handling properties, and equipment. There is a problem that the cost of purchasing, transporting, and maintaining the product is likely to increase.
(2) Further, in (Patent Document 2), the rotation means is supported on a support shaft of a fixed base that is fixed to a road surface with a rotation support portion provided at a substantially central portion of the airframe formed in a substantially square frame. Since the machine body is rotated around the rotation support part, the radius of rotation is limited, and it is not possible to adequately cope with the case where the dimensions of installation objects such as manholes are different. However, the surroundings of the installation will be cut wastefully, increasing the amount of waste such as asphalt and the amount of materials such as roadbed materials required for repair, resulting in lack of environmental protection and resource saving. It was.
(3) Furthermore, in (Patent Document 1) and (Patent Document 2), it is described that a dust collector for collecting cutting waste is provided, but not only a cutter blade but also a circular cutter body ( (Including the drive unit) is covered with a suction cover, and suction is performed from above the circular cutter blade, so that dust generated at the time of cutting tends to adhere to the main body of the circular cutter and lacks maintenance. It was. In addition, since suction is performed by sandwiching the cutter blade from above the circular cutter blade away from the cutting surface by the circular cutter, the dust suction efficiency is poor, and it is difficult to reliably suck particularly large dust particles. There was a problem of lack of certainty and efficiency of collection.
(4) When the road surface is cut into an arc shape, a rotary blade formed in a frustoconical shape is used. In this case, the angle formed between the inclined surface of the rotary blade and the road surface in the longitudinal section is 90. By adjusting the angle, the direction of entry of the side cutting blade formed on the inclined surface of the rotary blade into the road surface becomes parallel to the feed direction of the upper and lower sides of the rotary blade so that the rotary blade enters the road surface reliably and promptly. The road surface can be cut efficiently, and the load on the rotary blade can be reduced to suppress wear. At this time, since the outer peripheral surface of the rotary blade is conical, not only the curvature of the arc to be cut changes depending on the diameter of the rotary blade, but also the curvature of the arc to be cut changes depending on the cutting depth. It is necessary to select the diameter of the rotary blade according to the radius of the arc to be controlled and to manage the cutting depth.
(Patent Document 1) describes that the inclination angle of the cutting drive source support member can be changed, but the support shaft serving as the rotation center is located on the back side of the cutting drive source, Since the entire cutting drive source rotates around the spindle, not only is it difficult to adjust the approach angle of the rotary blade to a desired angle when a rotary blade of different dimensions is attached, for example Even if the angle between the inclined surface of the rotary blade and the road surface is adjusted to be 90 degrees, the horizontal position and vertical position of the rotary blade change depending on the size and shape. Management became complicated and had a problem that the workability was remarkably lacking.
In (Patent Document 2), the bottom half of the rotary blade is attached to the inclined mounting base so that the lower half of the vertical cross-sectional shape is substantially vertical. However, since the angle of the inclined mounting base is constant, the bottom surface of the rotary blade If a rotating blade with a different angle between the inclined surface and the inclined surface is attached, the angle formed between the inclined surface of the rotating blade and the road surface will not be 90 degrees, and it is impossible to cut with an appropriate arc and lacks versatility. Was.
(5) In both (Patent Document 1) and (Patent Document 2), the relationship between the radius and cutting depth of the arc to be cut and the dimensional shape of the rotary blade is not properly maintained, and the rotary blade is excessively large. A load is easily generated, and the frame body of the rotary blade is scraped off.

  The present invention solves the above-described conventional problems. By selecting and exchanging parts according to the shape to be cut, the rotary blade is moved in a desired direction, and the road surface is linear, arc-shaped, or straight and arc-shaped. Can be cut into a combination of shapes, etc., excellent in versatility, efficiently cutting around the installed objects on the road surface without waste, minimizing the cutting range, and asphalt and other waste and repair Rotating blades that can reduce the amount of necessary roadbed materials and other materials, are environmentally friendly and resource-saving, and have different dimensions depending on the radius of the arc to be cut when cutting the road surface into an arc Even if it is replaced, the approach direction of the rotary blade can always be adjusted appropriately, the cutting position does not change, the road surface can be cut easily and reliably with an appropriate arc, workability, Excellent versatility and occurs when cutting Can efficiently collect dust and prevent the dust from adhering to the rotary blade drive unit, which is excellent in dust collection efficiency and maintainability, and can reliably suck even dust with a large particle size, It is an object of the present invention to provide a road surface cutting device that is excellent in dust collection reliability and to provide a road surface cutting cutter blade that can cut a road surface in an arc shape with a desired radius and has excellent long life.

In order to solve the above problems, the road surface cutting device and the road surface cutting cutter blade of the present invention have the following configurations.
The road surface cutting device according to claim 1 of the present invention is a rotary blade drive unit to which a rotary blade formed in a truncated cone shape or a disk shape is detachably mounted, and the rotary blade drive unit is movable up and down. A frame having a lifting mechanism for holding, a moving wheel disposed at the bottom of the frame, a tilt holding mechanism for tiltingly holding the rotary blade driving unit with respect to the lifting mechanism, and a shape formed in the frame And an attachment arm fixing part to which an attachment arm for restricting the moving direction of the frame is fixed.
This configuration has the following effects.
(1) It has a rotary blade drive unit to which a rotary blade formed in a truncated cone shape or a disk shape is detachably mounted, and an attachment arm fixing unit to which an attachment arm for regulating the moving direction of the frame is fixed. Therefore, according to the shape which cuts a road surface, the kind of a rotary blade and an attachment arm can be selected and combined, the road surface can be easily and surely cut into a desired shape, and excellent versatility. In particular, when cutting the road surface in an arc shape, by selecting a frustoconical rotary blade with the optimum size and shape according to the diameter of the arc to be cut, the road surface can be smoothed without applying a load to the rotary blade. The wear of the rotary blade can be greatly reduced by cutting into two, and the long life of the rotary blade is excellent.
(2) Since the frame has an elevating mechanism that holds the rotary blade drive unit up and down freely, the rotary blade drive unit is moved up and down by the elevating mechanism to arbitrarily set the cutting depth of the rotary blade, and the road surface is desired It can be cut at a depth of, and is easy to handle.
(3) Since the moving wheel disposed at the bottom of the frame is provided, it can be easily moved manually when the road surface is cut or transported, resulting in excellent labor saving.
(4) Since there is a tilt holding mechanism that tiltably holds the rotary blade drive unit with respect to the lifting mechanism, the rotary blade drive unit is tilted by the tilt holding mechanism to optimally set the approach angle of the rotary blade with respect to the road surface. It can be used and has excellent versatility. In particular, when a road surface is cut by a conical rotary blade, a load is applied to the rotary blade by selecting an optimal approach angle according to the angle formed by the bottom portion of the conical portion of the rotary blade and the generatrix (inclined surface). Therefore, it is possible to cut the road surface smoothly and greatly reduce the wear of the rotary blade, and the long life of the rotary blade is excellent.
(5) Since the attachment arm fixing portion formed on the frame is provided, the attachment arm can be easily attached and detached, the attachment arm can be easily replaced and maintained, and the handleability and maintainability are excellent.

Here, an arbitrary shape can be selected for the frame, but when formed in a frame shape, it is excellent in workability and mass productivity, and can be easily carried by reducing the weight of the frame. In particular, by arranging the rotary blade drive unit and the rotary blade in the opening of the frame formed in a frame shape, the rotary blade drive unit and the rotary blade do not protrude outward from the frame, and the entire road surface cutting device is It can be made compact. The frame is provided with a handle for pushing. By simply holding the handle and pushing it forward, the frame can be moved in the direction of travel, providing excellent operability.
As the moving wheel, a free caster is preferably used. This is because the traveling direction can be freely changed and the frame can be smoothly moved in the direction regulated by the attachment arm.

As the lifting mechanism, one having a lifting part that lifts and lowers a cutter holding part that detachably holds the rotary blade driving part is preferably used. This is because the rotary blade drive unit can be removed for cleaning or replacement, and the maintenance is excellent.
The elevating mechanism may be any mechanism that can hold the rotary blade drive unit up and down with respect to the frame, but in particular, those that move up and down by screwing the male screw and the female screw adjust the height steplessly. It is excellent in operability and handling.
The tilt holding mechanism may be any mechanism as long as it can hold the rotary blade drive unit in a tiltable manner with respect to the lifting mechanism, but the gap between the lifting mechanism and the cutter holding portion that is tiltably held by the lifting mechanism. It is preferable to extend or slide the connecting shaft to be connected and to tilt the rotary blade drive unit together with the cutter holding unit. Especially, the one that slides the connecting shaft by screwing the male screw and the female screw has a simple structure and excellent mass productivity, and the tilt angle can be finely adjusted by controlling the amount of rotation of the male screw. Excellent in properties.

When the rotary blade is formed in a frustoconical shape, it is sufficient that the bottom cutting blade is formed at least on the peripheral edge (outer peripheral portion) of the frame body of the rotary blade, but in addition to the bottom cutting blade, You may form a side part cutting blade radially on an inclined surface (outer peripheral surface). In particular, when the bottom cutting blade and the side cutting blade are integrally formed, the bottom cutting blade can be firmly held by the side cutting blade, and the productivity and durability of the cutting blade are excellent.
The rotary blade moves up and down (up and down) together with the rotary blade drive unit by the lifting mechanism, so when using the rotary blade formed in the shape of a truncated cone, by tilting the rotary blade drive unit with the tilt holding mechanism, The approach angle of the partial cutting blade to the road surface can be arbitrarily set. At this time, by adjusting the tilt angle so that the vertical feed direction of the rotary blade drive part and the approach direction to the road surface of the side cutting blade are parallel, the rotary blade is independent of the size and shape of the rotary blade. Can be surely and promptly entered into the road surface to efficiently cut the road surface, which is excellent in labor saving. Moreover, since the road surface can be cut broadly by effectively using the width of the bottom cutting blade, the outer peripheral surface (side cutting blade) or inner peripheral surface (rear surface side) of the rotary blade and the cutting surface Friction hardly occurs, wear of the rotary blade can be effectively reduced, and the durability and long life of the rotary blade are excellent. In addition, if the approach angle to the road surface of the side cutting blade is inclined, the road surface can be cut into a linear shape or a circular arc shape with an inclined cross section.

The attachment arm fixing portion may be anything that can detachably fix the attachment arm, but an attachment that engages the protrusion and the notch is easy to attach and detach, and is excellent in usability. Moreover, when the fixing means by screwing is used, it can be firmly fixed and has excellent fixing stability. For example, a fixed shaft may be projected from the frame as an attachment arm fixing portion, and a notch hole formed in the base portion of the attachment arm may be engaged, or a bolt shaft may be provided as the attachment arm fixing portion. Alternatively, the nut may be screwed and fixed after the bolt shaft is engaged with the notch hole formed in the base of the attachment arm. Alternatively, a female screw portion may be formed as an attachment arm fixing portion in the frame, and a hexagon bolt or the like may be inserted through a fixing hole formed in the base portion of the attachment arm and fixed to the female screw portion.
The attachment arm can be selected according to the shape for cutting the road surface. As a specific attachment arm, the frame is moved along an arcuate trajectory, the arc cutting attachment arm that cuts the road surface into an arc shape, the frame is moved along a guide rail placed on the road surface, and the road surface There is an attachment arm for continuous cutting that continuously cuts the road with a straight line and an arc, and an attachment arm for linear cutting that makes the frame go straight and cuts the road surface in a straight line. As a road surface cutting device, it may be provided with at least one of an attachment arm for arc cutting, an attachment arm for continuous cutting, and an attachment arm for linear cutting, but when these plural attachment arms are provided as a set, By selectively mounting any one attachment arm according to the application or purpose, the road surface can be cut into a desired shape, and the versatility and functionality are excellent.

Invention of Claim 2 is the road surface cutting device of Claim 1, Comprising: As the said attachment arm, the base part detachably fixed to the said attachment arm fixing | fixed part, and the arm connected with the said base part And a rotation center fixing portion held by a rotation center guide disposed on the road surface and disposed on the arm portion, and along the arcuate locus centering on the rotation center fixing portion. An arc cutting attachment arm that moves the frame and cuts the road surface in an arc shape by the rotary blade formed in a truncated cone shape is provided.
With this configuration, in addition to the operation of the first aspect, the following operation is provided.
(1) By providing an attachment arm for cutting an arc as an attachment arm, the circumference of a circular installation such as a manhole can be cut into a circle, and compared with the case where the road surface is cut into a square or the like with a straight cutter. In addition to reducing the number of man-hours and ensuring that the corners are not cut off and ensuring road strength and durability, the amount of waste such as asphalt generated by cutting, and roadbed materials and other materials required for repair The amount can be reduced, and it is excellent in environmental protection and resource saving.
(2) Since the rotation center fixing portion held by the rotation center guide installed on the road surface is disposed on the arm portion connected to the base portion, an arc shape centering on the rotation center guide Since the frame can be moved along the trajectory, the road surface can be easily and surely cut into an arc shape by the rotary blade formed in a truncated cone shape, and the handleability is excellent.

Here, the rotation center guide and the rotation center fixing portion of the arc cutting attachment arm may be shaped so as to be rotatably supported. A fitting hole may be formed in the support portion of the rotation center guide, and a cylindrical rotation center fixing portion protruding from the arm portion of the arc cutting attachment arm may be inserted, or the rotation center guide may be formed in a column shape. The support portion formed in the above may be inserted into a hole-shaped rotation center fixing portion formed in the arm portion of the arc cutting attachment arm. In addition, a cylindrical member is inserted into the fitting hole drilled in the support part of the rotation center guide and the hole-shaped rotation center fixing part drilled in the arm part of the arc cutting attachment arm and rotated. You can also. In addition, when the rotation center fixing part is disposed so as to be movable in the longitudinal direction of the arm part, or when a plurality of rotation center fixing parts are formed on the arm part, the rotation center position can be selected according to the size of the manhole. It is excellent in versatility because the cutting range can be changed. Further, the same effect can be obtained even if the arm portion is formed to be extendable.
In addition, when a hinge or the like is disposed between the base and the arm so that the arm can be rotated with respect to the base, only the arm is attached with the arc cutting attachment arm attached to the frame when not in use. Can be folded, easy to carry, and easy to handle and save space.

Invention of Claim 3 is the road surface cutting device of Claim 2, Comprising: The said attachment arm for circular cutting is arrange | positioned in the bottom part of the edge part on the opposite side to the said base part side of the said arm part. It has the structure provided with the auxiliary wheel.
With this configuration, in addition to the operation of the second aspect, the following operation is provided.
(1) Since the attachment arm for cutting the arc has an auxiliary wheel disposed at the bottom of the end opposite to the base side of the arm, the arm can be supported substantially horizontally, Prevents horizontal load from being generated at the base of the attachment arm and the center of rotation, and allows smooth circular motion around the center of rotation, which is excellent in operational stability and usability. .
Here, as the auxiliary wheel, a free caster similar to the aforementioned moving wheel is preferably used.

Invention of Claim 4 is the road surface cutting device of Claim 1, Comprising: As the said attachment arm, the base part detachably fixed to the said attachment arm fixing | fixed part, and the arm connected with the said base part And two guide wheels that are supported on the vertical axis of the arm portion and are fitted to a guide rail that is installed on the road surface and rotate, and the frame is moved along the guide rail. It has the structure provided with the attachment arm for continuous cutting which cut | disconnects the said road surface continuously with a straight line and a circular arc with the said rotary blade formed in the shape of a head cone.
With this configuration, in addition to the operation of the first aspect, the following operation is provided.
(1) By providing an attachment arm for continuous cutting as an attachment arm, the road surface can be continuously cut into a complicated shape such as a square with a rounded corner or a curved line. There is no need to cut intermittently by using different rotary blades for the straight part and the arc part, and the work man-hours can be greatly reduced, and the cutting shape is flexible and labor-saving.
(2) A guide rail formed in a desired shape by having two guide wheels that are supported by a guide rail that is supported by a vertical shaft of an arm portion that is connected to the base portion and is installed on a road surface. Therefore, the road surface can be continuously and simply cut with a straight line and an arc by the rotary blade formed in the shape of a truncated cone, and the handleability is excellent.

Here, the guide wheel is pivotally supported so as to protrude to the lower portion of the arm portion, and is inserted into the groove portion of the guide rail. As the guide wheel, a roller or a cam follower which is a kind of bearing is preferably used.
The guide rail can be formed in a desired shape to be cut, but in particular, if a guide rail formed in a rectangular shape with rounded corners is used, the road surface around the information box or the like along the shape. It can be cut into a substantially rectangular shape. In addition, if the guide rail formed in the circular arc shape is used, the road surface can be cut in the circular arc shape even with the continuous cutting attachment arm without replacing the circular arc attachment arm.

Invention of Claim 5 is the road surface cutting device of Claim 1, Comprising: As the said attachment arm, the base part detachably fixed to the said attachment arm fixing | fixed part, and the arm connected with the said base part And a straight traveling wheel disposed at the bottom of the arm portion so as to be able to travel straight in a horizontal axis direction perpendicular to the rotational axis of the rotary blade drive unit, and the frame in the traveling direction of the straight traveling wheel. And a straight cutting attachment arm that cuts the road surface in a straight line by the rotary blade formed in a truncated cone shape or a disk shape.
With this configuration, in addition to the operation of the first aspect, the following operation is provided.
(1) By providing an attachment arm for straight line cutting as an attachment arm, the frame can be surely moved straight and the road surface can be cut into a straight line, and there is no need to prepare a cutter for straight line cutting separately. It can also be used for installation work, gas pipes, water pipes, and other pipes, repairs and inspections of pipes that have already been buried, and is excellent in workability and handling.
(2) It is formed in a desired shape by having a straight traveling wheel disposed at the bottom of the arm portion connected to the base portion so as to be able to travel straight in the horizontal axis direction orthogonal to the rotation axis of the rotary blade drive unit. Since the frame can be moved along the guide rail, the road surface can be easily and reliably cut continuously with straight lines and arcs by the rotary blade formed in the shape of a truncated cone, and the handleability is excellent.

  Here, as the straight traveling wheel, a fixed caster whose traveling direction does not change is preferably used. In particular, by arranging a plurality of straight traveling wheels in parallel in the traveling direction, the straight traveling performance can be improved and the operational stability is excellent.

A sixth aspect of the present invention is the road surface cutting device according to any one of the first to fifth aspects, wherein the road surface cutting device is disposed in the rotary blade drive unit and between the rotary blade drive unit and the rotary blade. For dust collection, comprising: a partition part for partitioning; a rotary blade cover part covering the outer periphery of the rotary blade; and a suction hose connection part formed on the rotary blade cover part and connected to a suction hose of a dust collector It has the structure provided with the cover.
With this configuration, in addition to the operation of any one of claims 1 to 5, the following operation is provided.
(1) Since the dust collection cover has a partition part that is disposed in the rotary blade drive unit and partitions the rotary blade drive unit and the rotary blade, dust or the like is hardly attached to the rotary blade drive unit, and the rotary blade drive unit Excellent maintainability.
(2) Since the dust collection cover includes a rotary blade cover portion that covers the outer periphery of the rotary blade, and a suction hose connection portion to which the suction hose of the dust collector is connected to the rotary blade cover portion, The dust generated by cutting can be prevented from scattering outside the rotary blade cover part, and the dust generated in the rotary blade cover part is efficiently sucked from the suction hose connected to the suction hose connection part and collected in the dust collector. It is easy to clean after cutting work and has excellent environmental protection.
(3) Since the suction hose connection part to which the suction hose of the dust collector is connected is formed on the rotary blade cover part of the dust collection cover, the suction hose of the dust collector can be easily connected and is generated at the time of cutting. It is possible to perform cutting work while collecting dust, which not only excels in stability of cutting work and efficiency of dust collection, but also removes the suction hose when not in use and transports and stores the dust collector separately. It can be used for cleaning work, and is highly versatile.

Here, the partition part and the rotary blade cover part are disposed so as to cover at least the upper half of the rotary blade. This is to prevent the lower end side of the partition part and the rotary blade cover part from coming into contact with the road surface even if the rotary blade drive unit moves up and down depending on the cutting depth of the rotary blade. In addition, if the partition part is slidably arranged with respect to the rotary blade cover part, the upper part, both sides, and the back side of the rotary blade are always rotated almost all over the surface regardless of the vertical movement of the rotary blade drive part. It can be covered by the blade cover part, and dust can be effectively prevented from scattering around the cutting part.
Further, by making the rotary blade cover part detachable, the rotary blade can be easily replaced. In addition, the same effect is acquired even if only the back surface side plate of a rotary blade cover part is detachable instead of making the rotary blade cover part whole removable.

The position of the suction hose connecting portion may be any of the upper surface portion, the side surface portion, and the back surface portion of the rotary blade side cover portion, but the side surface portion near the road surface cutting position and the lower end side of the back surface portion are excellent in suction efficiency and are preferable. In particular, when a suction hose connection is arranged on the side of the frame in the direction of travel, dust generated by cutting is immediately sucked from the suction hose connected to the suction hose connection to minimize dust scattering. It can be suppressed and has excellent environmental protection.
In addition, it is preferable that the dust collector main body is connected to the frame by attaching a caster, or is placed and fixed on the frame so that it can move together with the frame.

The invention according to claim 7 is the road surface cutting device according to claim 6, wherein the partition portion of the dust collecting cover is slidably disposed on the rotary blade cover portion, and the rotary blade The cover portion includes a cover portion support wheel disposed on the bottom portion of the back side plate facing the partition portion with the rotary blade interposed therebetween.
With this configuration, in addition to the operation of the sixth aspect, the following operation is provided.
(1) Since the partition portion of the dust collecting cover is slidably disposed on the rotary blade cover portion, the rotary blade cover can be moved even if the partition portion moves up and down as the rotary blade drive portion moves up and down. The part can be held in place to cover almost the entire surface of the rotary blade, and regardless of the cutting depth of the rotary blade, it is possible to reliably prevent dust from scattering around the cutting location. Excellent.
(2) The rotary blade cover portion is provided with a cover portion support wheel disposed at the bottom of the back side plate facing the partition portion with the rotary blade interposed therebetween, so that the rotary blade side cover portion is covered with the cover portion support wheel. It is possible to reduce the resistance with the road surface and smoothly move while supporting the structure, and the workability is excellent.

Here, the partition part and the rotary blade cover part may be slidable with respect to each other. For example, if a guide part is provided on the rotary blade drive part side of the partition part and a sliding part that slides along the guide part of the partition part is provided on the rotary blade cover part, the partition part is provided with respect to the rotary blade cover part. Can be slid. In particular, a device using a sliding guide such as a slide rail having a guide portion and a sliding portion formed in advance is preferable because the operation is smooth and the operation is stable and reliable. The arrangement of the guide part and the sliding part may be inside or outside of the rotary blade cover part, but by arranging it outside, dust can be prevented from entering between the guide part and the sliding part, and the operation stability, Excellent maintainability.
It should be noted that at least the partition portion needs to be slidable with respect to the rotary blade cover portion while moving from the state where the lower end side of the rotary blade is in contact with the road surface to the maximum cutting depth. In addition, when the rotary blade drive unit is raised to a position where the lower end side of the rotary blade is not in contact with the road surface, the cover support wheel can be lifted from the road surface by raising the rotary blade cover unit together with the partition unit. The road surface cutting device can be easily moved when not in use and has excellent transportability and handling. For example, if the upper end of the guide part of the partitioning part is in contact with the inner surface of the upper surface part of the rotary blade cover part at a certain height or more, the partition part and the rotary blade cover part can be connected together without performing any special operation. It can be raised and has excellent usability.

Invention of Claim 8 is the road surface cutting device of Claim 6 or 7, Comprising: The said suction hose connection part of the said dust collection cover is a rounding-up direction side of the said rotary blade of the said rotary blade cover part It has the structure arrange | positioned at the side part or upper part.
With this configuration, in addition to the operation of the sixth or seventh aspect, the following operation is provided.
(1) By connecting the suction hose connection part of the dust collection cover to the side or top of the rotary blade cover part on the side of the rotary blade, the dust generated by cutting is connected to the suction hose connection part. The suction hose can be immediately sucked to minimize dust scattering, and even dust with large particles can be reliably sucked, thus providing excellent environmental protection and dust collection reliability.
Here, when arrange | positioning a suction hose connection part in the side part of a rotary blade cover part, the position of the height direction can be selected suitably.

A ninth aspect of the present invention is the road surface cutting device according to any one of the first to eighth aspects, wherein the rotary blade is formed in a truncated cone shape to be mounted on the rotary blade drive unit. The lowest point where the upper surface and the inclined surface intersect is positioned on the horizontal axis where the reference plane in the height direction of the vertical movement by the lifting mechanism and the central axis of the tilting by the tilt holding mechanism intersect. is doing.
With this configuration, in addition to the operation of any one of claims 1 to 8, the following operation is provided.
(1) The lowest point where the upper surface and inclined surface of the rotary blade formed in a frustoconical shape mounted on the rotary blade drive section intersect is the reference surface in the height direction of the vertical movement by the lifting mechanism, and tilt holding When the rotary blade formed in the shape of a truncated cone is used by being located on the horizontal axis where the central axis of tilting by the mechanism intersects, the height from the bottom surface to the top surface of the cone portion or the cone portion Even if the rotary blade has a different angle between the bottom and the inclined surface, the rotary blade is always based on the lowest point (the lowest point of the root (folding point) of the rotary blade) where the upper surface and the inclined surface of the rotary blade intersect. Since the drive unit can be moved up and down or tilted, the cutting depth and approach angle of the rotary blade can be easily managed, and the approach direction of the rotary blade can always be adjusted appropriately regardless of the radius of the arc to be cut. Excellent workability and versatility.
(2) Dimensional shape (height from the bottom surface to the top surface of the cone portion or the cone by using the lowest point where the upper surface and the inclined surface of the rotary blade formed in the truncated cone shape intersect as the horizontal position reference. Even if a rotating blade with a different angle (the angle between the bottom surface and the inclined surface) is used, the scale engraved on the arm part of the arc cutting attachment arm will not be distorted, and the scale can be used as a guide for easy and reliable targeting. The cutting work can be performed with an almost accurate turning radius (appropriate arc), and is excellent in versatility and handling.

  Here, the frustoconical rotary blade has a different shape depending on the size of the arc to be cut, but the difference is that the diameter of the bottom surface of the cone, the height from the bottom surface to the top surface, the bottom surface and the inclined surface ( The diameter of the upper surface of the conical portion and the length of the generatrix are formed to be equal. Therefore, the position of the lowest point (the lowest point of the root (folding point) of the rotary blade) where the upper surface and the inclined surface of the rotary blade intersect is always constant, and this point is the height direction of the vertical movement by the lifting mechanism The cutting depth, approach angle, and horizontal position of the rotating blade are managed by mounting the rotating blade so that it is positioned on the horizontal axis where the reference plane of the tilt and the central axis of tilting by the tilt holding mechanism intersect be able to. Also, the tilt holding mechanism is used so that the direction of vertical movement by the elevating mechanism (upward and downward feeding direction of the rotary blade drive unit) and the approach direction of the outer peripheral surface (side cutting blade) of the rotary blade to the road surface are parallel. By adjusting the tilt angle to 90 degrees, the horizontal position of the cutting is the same regardless of the size and shape of the rotary blade, so it is possible to continuously create complex shapes by combining arcs with different radii or arcs and straight lines. It can be cut and has excellent versatility.

A cutter blade for cutting a road surface according to a tenth aspect of the present invention is a rotary blade formed in a truncated cone shape, and is formed on a frame main body formed in a truncated cone shape and a bottom peripheral edge of the frame body. A bottom cutting blade, and a protrusion amount on the front surface side of the bottom cutting blade with respect to the frame body is formed to be larger than a protrusion amount on the back surface side.
This configuration has the following effects.
(1) Since it has a frame main body formed in a frustoconical shape and a bottom cutting blade formed on the periphery of the bottom of the frame main body, the road surface can be formed into an arc shape only by rotating the road surface cutting device around the rotation center. It can be cut and has excellent usability.
(2) Since the protrusion amount on the surface side of the bottom cutting blade with respect to the frame body is formed larger than the protrusion amount on the back surface side, even if the surface side of the bottom cutting blade is worn in a taper shape due to a load during cutting, The frame body is not cut, the tip side and the surface side of the bottom cutting blade are worn in a well-balanced manner, and a constant cutting ability can be maintained, and the long life and cutting reliability are excellent.

Here, when cutting an arc with a road surface cutting cutter blade (rotary blade) formed in a frustoconical shape, in order to keep the load on the road surface cutting cutter blade, What is necessary is just to make it the curvature of the cone part of the cutter blade for a cutting | disconnection correspond with the curvature of the circular arc to cut | disconnect. The curvature of the conical part varies depending on the position in the height direction. The curvature is smaller on the bottom side and larger on the upper side. Therefore, when cutting an arc with a large curvature, the amount of cut is reduced and the curvature is small. When cutting the arc, the cutting amount may be increased.
However, even if the curvature of the cone part of the cutter blade for cutting the road surface matches the curvature of the arc to be cut on the surface of the road surface, the curvature of the cone part entering the road surface is different from the curvature of the cutting surface (surface). Since the curvature is smaller toward the bottom surface side (tip side of the cutting blade), the load generated during cutting also increases on the bottom surface side (tip side of the cutting blade). At the same time as the tip side of the cutting blade wears, the surface side wears, but at this time, the load is larger on the bottom side (tip side of the cutting blade), so the amount of wear on the tip side (cone bottom side) of the cutting blade is large, The amount of wear on the upper surface side of the cone is reduced, and as a result, the surface of the cutting blade is worn in a tapered shape from the tip side.

In other words, if the cutting depth is deepened, it is possible to cut an arc with a large curvature, but the load on the tip side and the surface side of the cutting blade increases accordingly, the amount of wear on the surface side of the cutting blade increases, and the service life increases. Tends to decrease. Therefore, in order to cut arcs of various curvatures with one road surface cutting cutter blade, it is necessary to form the cutting blade thicker than the thickness of the frame body and increase the amount of protrusion on the surface side.
The amount of protrusion on the front side of the bottom cutting blade with respect to the frame body is twice the amount of protrusion on the back side, although it depends on the height of the bottom cutting blade (the length of the cone in the direction of the generatrix) and the amount of protrusion on the back side. It is preferable to form it in 30 times, preferably 3 times to 10 times. As the amount of protrusion on the front side becomes smaller than three times the amount of protrusion on the back side, the surface side wears before the tip side (bottom side of the cone) of the bottom cutting blade, the frame body is shaved, and the cutting ability The bottom cutting blade becomes unnecessarily thick and becomes less prone to decrease in productivity as it becomes larger than 10 times. Before the surface side of the bottom cutting blade wears, the tip side ( There is a tendency that the bottom side of the cone) is worn first, and the resource saving tends to be reduced. Moreover, if the protrusion amount on the front surface side is smaller than twice the protrusion amount on the back surface side, the surface side of the bottom cutting blade will be worn away quickly, lacking long life, and if it exceeds 30 times, productivity, saving This is not preferable because the resource properties are significantly reduced and the usability is insufficient.
In particular, by forming the protrusion amount on the surface side of the bottom cutting blade with respect to the frame main body to be 3 to 10 times the protrusion amount on the back surface side, the tip side and the surface side of the bottom cutting blade are worn in a well-balanced manner, and the life is substantially constant The cutting ability can be maintained, and it has a long service life and excellent cutting reliability.

As described above, according to the road surface cutting device and the road surface cutting cutter blade of the present invention, the following advantageous effects can be obtained.
According to invention of Claim 1, it has the following effects.
(1) Versatile road surface cutting that can easily and reliably cut a road surface into a desired shape by selecting and combining the types of rotary blades and attachment arms according to the shape to cut the road surface. An apparatus can be provided.
(2) A road surface cutting device that allows easy attachment / detachment of the attachment arm to the attachment arm fixing part formed on the frame, facilitates replacement and maintenance of the attachment arm, and excels in handling and maintenance. Can be provided.

According to invention of Claim 2, in addition to the effect of Claim 1, it has the following effects.
(1) By using a circular cutting attachment arm to cut the circumference of circular objects such as manholes in a circular shape, the number of man-hours is greatly reduced compared to cutting a road surface into a square shape with a straight cutter. As well as ensuring that the corners are not cut off, ensuring the strength and durability of the road surface, it is possible to reduce the amount of waste such as asphalt generated by cutting and the amount of materials such as roadbed materials required for repair. A road surface cutting device excellent in environmental protection and resource saving can be provided.

According to invention of Claim 3, in addition to the effect of Claim 2, it has the following effects.
(1) The arm portion can be supported substantially horizontally by the auxiliary wheel disposed at the bottom of the end opposite to the base side of the arm portion of the arc cutting attachment arm, and the base of the arc cutting attachment arm A road surface cutting device with excellent operational stability and usability that can prevent a horizontal load from being generated at the center of rotation and the center of rotation, and perform smooth circular motion around the center of rotation. Can be provided.

According to invention of Claim 4, in addition to the effect of Claim 1, it has the following effects.
(1) By using an attachment arm for continuous cutting, the road surface can be continuously cut into a desired shape. It is possible to provide a road surface cutting device that is excellent in laborability and flexibility in cutting shape that does not need to be used separately and that can significantly reduce the number of work steps.

According to the invention described in claim 5, in addition to the effect of claim 1, the following effect is obtained.
(1) By using a straight cutting attachment arm, the road surface can be cut straight without preparing a straight cutting cutter, manhole installation work, gas pipes, water pipes, etc. It is possible to provide a road surface cutting device excellent in workability and handleability that can be used for burial work of pipes, repair and inspection work of pipes that are already buried.

According to invention of Claim 6, in addition to the effect of any one of Claims 1 thru | or 5, it has the following effects.
(1) The dust collecting cover has a partition part that partitions between the rotary blade driving part and the rotary blade, and the rotary blade cover part is covered on the outer periphery of the rotary blade. A road surface cutting device that does not stick easily, has excellent maintainability of the rotary blade drive unit, can prevent dust from scattering around the rotary blade cover, is easy to clean after cutting work, and has excellent environmental protection. Can be provided.
(2) Since the suction hose connection part is formed in the rotary blade cover part partitioned from the rotary blade drive part by the partition part, the suction hose of the dust collector can be easily connected, and dust generated during cutting is collected by the dust collector. Therefore, it is possible to provide a road surface cutting apparatus that can perform cutting work while reliably collecting the road surface and that is excellent in the stability of the cutting work and the efficiency of dust collection.

According to invention of Claim 7, in addition to the effect of Claim 6, it has the following effects.
(1) Since the partition part is slidable with respect to the rotary blade cover part, even if the partition part moves up and down together with the rotary blade drive part, the rotary blade cover part is held in a predetermined position to It is possible to provide a road surface cutting device excellent in workability that can cover almost the entire surface and can reliably prevent dust from being scattered around the cutting portion regardless of the cutting depth of the rotary blade.

According to invention of Claim 8, in addition to the effect of Claim 6 or 7, it has the following effects.
(1) By simply connecting the suction hose of the dust collector to the suction hose connection part arranged on the side or upper side of the rotary blade of the rotary blade cover part, the dust generated by cutting is immediately sucked, It is possible to provide a road surface cutting device that can suppress dust scattering to the minimum, and can reliably suck even dust with large particles, and has excellent environmental protection and dust collection reliability.

According to invention of Claim 9, in addition to the effect of any one of Claims 1 thru | or 8, it has the following effects.
(1) When using a rotary blade formed in a frustoconical shape, with the lowest point (the lowest point of the root (folding point) of the rotary blade) where the upper surface and the inclined surface of the rotary blade intersect as a reference, By moving the rotary blade drive unit up and down and tilting, and setting the distance to the center of rotation when cutting the arc, the height from the bottom surface to the top surface of the cone portion or the bottom surface of the cone portion and the inclined surface is formed. Even for rotary blades with different angles, the cutting depth, approach angle, and horizontal position of the rotary blade can be easily managed, and the approach direction of the rotary blade is always appropriate regardless of the radius of the arc to be cut. It is possible to provide a road surface cutting device excellent in workability and versatility that can be adjusted easily and can easily and surely cut a road surface with an appropriate arc without changing the horizontal position of the cutting. it can.

According to invention of Claim 10, it has the following effects.
(1) Since the protrusion amount on the surface side of the bottom cutting blade with respect to the frame main body is formed larger than the protrusion amount on the back surface side, even if the surface side of the bottom cutting blade is worn in a taper shape due to a load during cutting, The frame body is not cut and the tip side and the surface side of the bottom cutting blade wear out in a well-balanced manner and last longer. It is possible to provide a road surface cutting cutter blade excellent in reliability.

(Embodiment 1)
A road cutting device according to Embodiment 1 of the present invention will be described below with reference to the drawings.
1 is a side view of the road surface cutting device according to Embodiment 1, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. .
1 and 2, reference numeral 1 denotes a road surface cutting device according to the first embodiment, 2 denotes a frame of the road surface cutting device 1 which is formed in a substantially C shape in plan view (see FIG. 3), and 2 a denotes a frame 2 Wheels for moving the road surface cutting device 1 using free casters disposed at the bottoms of the four corners, 2b is a handle for pushing the road surface cutting device 1 protruding from the upper surface of the rear end side of the frame 2, and 3 is a wharf. A rotary blade drive unit using a disc grinder to which a rotary blade 4 formed in a conical shape or a disc shape is detachably mounted, and 5 is an elevating mechanism of the road surface cutting device 1 that holds the rotary blade drive unit 3 up and down. , 6 is a guide shaft of the elevating mechanism 5 erected at two front and rear positions on one side of the frame 2, and 7 is a male screw portion 7a formed so as to be rotatable between the two guide shafts 6. The screwing shaft 7b of the lift mechanism 5 is disposed at the upper end of the screwing shaft 7 and rotates the screwing shaft 7. The lifting mechanism handle 8 of the lowering mechanism 5 includes a guide portion 8a through which the guide shaft 6 is inserted and a screwing portion 8b to be screwed into the male screw portion 7a of the screwing shaft 7. Elevating part 5 of the elevating mechanism 5 that elevates and lowers along the shaft 7, 8c is a support arm at two front and rear portions extended on both sides of the elevating part 8, and 9 is rotatable at the lower end of the support arm 8c by a shaft support 9a. The held cutter holder 10 having a substantially U-shaped cross section is tilted at a desired angle with respect to the lifting / lowering part 8 of the lifting / lowering mechanism 5 with the cutter holding part 9 holding the rotary blade driving part 3 around the shaft support part 9a. A tilt holding mechanism of the road surface cutting device 1 to be moved, and 11 is a tilt holding mechanism formed of a bolt shaft and slidably disposed between one support arm 8c of the elevating unit 8 and one side of the cutter holding unit 9. Reference numeral 10 denotes a connecting shaft, and 12 denotes a connecting shaft disposed on one support arm 8c of the elevating unit 8. 1 is a connecting shaft guide portion that is screwed with 1 to hold the connecting shaft 11 in a reciprocating manner, and 13 is disposed on one side of the cutter holding portion 9 and is loosely fitted to the connecting shaft 11 so that the lower end portion of the connecting shaft 11 is A connection holding portion 14 of the tilt holding mechanism 10 that is rotatably held, and 14 is provided on the upper end side of the connection shaft 11, and a tilt holding mechanism that displays the movement amount of the connection shaft 11 measured from the rotation amount of the connection shaft 11 as a numerical value. 10 is a digital position indicator, 14a is a screw lock portion that is connected to the bottom of the digital position indicator 14 to prevent rotation of the connecting shaft 11 due to vibrations, and 15 is arranged at the upper end of the connecting shaft 11 and rotates the connecting shaft 11. The tilt operation handle 50 of the tilt holding mechanism 10 that slides (moves up and down) along the connecting shaft guide portion 12 is a road surface cut by the road surface cutting device 1.

  Note that point p in FIG. 1 is a tilting central axis connecting the upper surface of the conical portion (inclined surface) of the rotary blade 4 formed in a truncated cone shape and the centers of the shaft support portions 9a on both sides of the cutter holding portion 9. And corresponds to the lowest point (the lowest point at which the upper surface of the rotary blade 4 and the inclined surface of the conical portion intersect). Therefore, when the cutter holding unit 9 holding the rotary blade driving unit 3 is tilted, the rotary blade 4 formed in a truncated cone shape has the lowest point (rotary blade 4) of the root (folding point) of the rotary blade 4. It tilts around a point p which is the lowest point where the top surface of the cone and the inclined surface of the conical portion intersect. Further, the rotary blade drive unit 3 to which the rotary blade 4 is attached has a horizontal axis where the point p intersects the reference plane in the height direction of the vertical movement by the lifting mechanism 5 and the central axis of the tilt by the tilt holding mechanism 10. It attaches to the cutter holding part 9 so that it may be located on the top. The frustoconical rotary blade 4 is formed so that the diameter of the upper surface of the cone portion and the length of the generatrix are equal, and this point p is the dimension of the rotary blade 4 (from the bottom surface of the cone portion to the upper surface). Regardless of the height of the cone or the angle between the bottom surface of the cone and the inclined surface). Therefore, the rotary blade drive unit 3 can be moved up and down or tilted with reference to the lowest point (the lowest point of the root (folding point) of the rotary blade 4) where the upper surface and the inclined surface of the rotary blade 4 always intersect. Therefore, the cutting depth, approach angle, and horizontal position of the rotary blade 4 can be easily managed, and the approach direction of the rotary blade 4 can always be properly adjusted regardless of the radius of the arc to be cut, and the cutting position can be changed. It is possible to cut the road surface with an appropriate arc easily and surely without making it.

In FIG. 3, 4a is a bottom cutting blade disposed on the outer periphery of the bottom of the rotary blade 4, 4b is a side cutting blade formed radially on the inclined surface of the rotary blade 4 and integrally formed with the bottom cutting blade 4a, 9b. Is a cutter fixing portion that protrudes from the side of the cutter holding portion 9 and holds both sides of the rotary blade driving portion 3, and 9c is detachable from both sides of the rotary blade driving portion 3 to the cutter fixing portion 9b of the cutter holding portion 9. 9d is a fixing screw for removably fixing the back surface portion of the rotary blade driving unit 3 to the cutter holding unit 9, and 16 is respectively provided at opposite ends of the frame 2 formed in a substantially C shape. An attachment arm fixing portion of the road surface cutting device 1 provided with a protruding fixed shaft 16a and a fixing protrusion 16b disposed at the tip of the fixed shaft 16a, 20 is a dust collecting cover covered by the rotary blade 4, 20a indicates the cutting of the rotary blade 4 of the dust collection cover 20. Suction hose connecting portion disposed on the side of the raising direction (advancing direction of the frame 2), 40 is a suction hose of a dust collector (not shown) connected to the suction hose connection 20a.
For convenience of explanation, the dust collection cover 20 is omitted in FIGS. 1 and 2, and a schematic cross section of the dust collection cover 20 is shown in FIG.

In the present embodiment, the frame 2 is formed in a substantially C shape, but the shape of the frame 2 can be arbitrarily selected such as a rectangular shape or a circular shape. By forming the frame 2 in a frame shape, it is excellent in workability and mass productivity, and the frame 2 can be reduced in weight and easily carried. In particular, by disposing the rotary blade drive unit 3 and the rotary blade 4 in the opening of the frame 2 formed in a frame shape, the rotary blade drive unit 3 and the rotary blade 4 do not protrude outward from the frame 2. The road surface cutting device 1 as a whole can be made compact.
By using a free caster as the moving wheel 2a, the traveling direction can be freely changed, and the frame 2 can be smoothly moved in a desired direction.
By providing the handle 2b for pushing on the frame 2, it is possible to move the frame 2 in the advancing direction simply by grasping the handle 2b and pushing it forward, and the operability is excellent.

Since the rotary blade drive unit 3 is fixed from three directions by the fixing screws 9c and 9d, the fixing stability is excellent. Moreover, the attachment and detachment to the cutter holding part 9 is easy, and it can be easily removed and cleaned, or exchanged, and is excellent in maintainability.
In the present embodiment, as the elevating mechanism 5, the elevating part 8 is moved up and down by screwing between the screwing shaft 7 and the screwing part 8 b of the elevating part 8. The height of the elevating part 8 can be adjusted steplessly by simply turning the elevating operation handle 7b, and the operability and handling are excellent. The elevating mechanism 5 is not limited to the present embodiment, and any mechanism that can hold the rotary blade drive unit 3 up and down with respect to the frame 2 may be used. If a plate with a depth scale indicating the depth of cut is erected on the frame 2 and a depth scale pointer indicating the depth scale is provided on the elevating part 8 of the elevating mechanism 5, etc. Work can be performed while checking the depth of cut, and workability is excellent. In addition, since the rotary blade drive part 3 is moved up and down on the basis of the lowest point (the lowest point of the root (folding point) of the rotary blade 4) where the upper surface and the inclined surface of the rotary blade 4 intersect, the rotary blade 4 is moved. Even if it is replaced, the depth scale does not go wrong, and it is excellent in reliability and usability.

FIG. 4 is a cross-sectional side view of an essential part showing a state in which the rotary blade driving unit of the road surface cutting device according to Embodiment 1 of the present invention is tilted.
In the present embodiment, as the tilt holding mechanism 10, a bolt shaft is provided between one support arm 8 c of the lifting unit 8 of the lifting mechanism 5 and one side of the cutter holding unit 9 that holds the rotary blade driving unit 3. What was connected with the connecting shaft 11 formed in (1) was used.
When the tilting operation handle 15 is rotated in one direction from the state of FIG. 2, the connecting shaft 11 screwed to the connecting shaft guide portion 12 moves upward along the connecting shaft guide portion 12. At this time, the lower end portion of the connecting shaft 11 is loosely fitted and held by the connecting holding portion 13 disposed on one side of the cutter holding portion 9, and the cutter holding portion 9 is freely rotatable by the shaft support portion 9a. Since it is hold | maintained, the cutter holding | maintenance part 9 rotates centering on the axial support part 9a, while the connection holding | maintenance part 13 moves upwards with the connection axis | shaft 11. FIG. As a result, as shown in FIG. 4, the rotary blade driving unit 3 held by the cutter holding unit 9 can be tilted at a desired angle with respect to the lifting unit 8 of the lifting mechanism 5. Thereby, the approach angle to the road surface 50 of the rotary blade 4 can be set optimally only by operating the handle 15 for tilting operation.
Next, if the rotary blade drive unit 3 is driven and the handle 7b is operated while the rotary blade 4 is rotated, the rotary blade drive unit 3 can be lowered until the desired cutting depth is reached. The cutting of the road surface 50 can be started.

Since the rotary blade 4 moves up and down (lifts and lower) together with the rotary blade drive unit 3 by the lifting mechanism 5, the rotary blade drive unit 3 is preliminarily moved by the tilt holding mechanism 10 according to the size of the rotary blade 4 and the shape of cutting the road surface 50. By tilting, the angle of entry of the rotary blade 4 into the road surface 50 can be arbitrarily set, and by selecting the optimum angle, the load on the rotary blade 4 can be reduced and wear can be suppressed. In particular, when the angle formed between the side cutting blade 4b and the road surface 50 is 90 degrees, the approach direction of the rotary blade 4 to the road surface 50 of the side cutting blade 4b is parallel to the elevation direction of the rotary blade driving unit 3. Therefore, the rotary blade 4 can be surely and promptly entered into the road surface 50 to efficiently cut the road surface, which is excellent in labor saving. Further, since the width direction of the bottom cutting blade 4a is parallel to the road surface 50, the entire width of the bottom cutting blade 4a can be effectively used to cut the road surface 50 broadly, and the outer surface of the rotary blade 4 ( Friction hardly occurs between the side cutting blade 4b) or the inner peripheral surface (back surface side) and the cut surface, and the wear of the rotary blade 4 itself can be effectively reduced. Excellent long life.
If the angle of entry of the rotary blade 4 into the road surface 50 is inclined, the road surface can be cut into a linear shape or a circular arc shape with an inclined cross section. In addition, the rotary blade 4 should just have the bottom part cutting blade 4a at least, and does not need to form the side part cutting blade 4b.

  In FIG. 4, the cone of the rotary blade 4 is placed on the tilting central axis passing through the shaft support portion 9a which becomes the center when the cutter holding portion 9 holding the rotary blade driving portion 3 is tilted, as shown in FIG. A point p that is an intersection with the upper surface of the portion (inclined surface) is located. Accordingly, as shown in FIG. 4, when the rotary blade drive unit 3 is tilted by the tilt holding mechanism 10, the rotary blade 4 tilts around the central axis of the shaft support portion 9 a passing through the point p. The approach angle of the blade 4 to the road surface 50 can be accurately adjusted. Further, even when the rotary blade 4 having a different dimensional shape is used, the point p is always located on the axial center of the shaft support portion 9a, so that the dimensional shape of the rotary blade 4 (the height from the bottom surface to the upper surface of the conical portion is high). Regardless of the angle between the bottom surface of the conical portion and the inclined surface), the angle at the time of tilting can be adjusted based on the lowest point of the root (folding point) of the rotary blade 4, so that the tilt angle can be managed. Is easy and the reliability of angle adjustment is excellent. Moreover, the approach direction to the road surface 50 of the side cutting blade 4b of the rotary blade 4 is parallel to the ascending / descending direction of the rotary blade drive unit 3 (the angle formed between the approach direction of the side cutting blade 4b and the road surface 50 is 90 degrees). In this case, the cutting start position is not shifted, and the road surface 50 can be cut with an appropriate arc by the rotary blades 4 having different dimensions.

Since the tilt holding mechanism 10 includes the digital position indicator 14 that displays the movement amount of the connecting shaft 11 measured from the amount of rotation of the connecting shaft 11 as a numerical value, the moving amount of the connecting shaft 11 and the tilt of the cutter holding portion 9 are preliminarily displayed. If the relationship with the angle is obtained, the rotary blade driving unit 3 can be tilted by a desired angle simply and reliably based on the display of the digital position indicator 14, and the operability is excellent.
Usually, in order to allow the rotary blade 4 to enter the road surface 50 reliably and promptly, the ascending / descending direction of the rotary blade drive unit 3 and the approach direction of the side cutting blade 4b of the rotary blade 4 to the road surface 50 are made parallel. If the rotary blade drive unit 3 is tilted so that the angle between the side cutting blade 4b and the road surface 50 is 90 degrees, only the display value of the digital position indicator 14 should be recorded. Good.
Further, since the rotation of the connecting shaft 11 due to vibration or the like can be prevented by the screw lock portion 14a, the angle holding reliability is excellent.
The tilt holding mechanism 10 is not limited to the present embodiment, and any mechanism that can hold the rotary blade drive unit 3 in a tiltable manner with respect to the lifting mechanism 5 may be used.

Next, the details of the dust collecting cover of the road surface cutting device according to the first embodiment will be described.
FIG. 5 is a schematic cross-sectional plan view showing a main part of the dust collecting cover of the road surface cutting device according to the first embodiment. FIG. 6 is a main cross section showing the dust collecting cover of the road surface cutting device according to the first embodiment. It is a side view.
5 and 6, reference numeral 21 denotes a partition part that is disposed in the rotary blade drive part 3 and partitions the rotary blade drive part 3 and the rotary blade 4, 21 a is a bent part that extends on both sides of the partition part 21, Reference numeral 22 denotes a rotary blade cover portion that is slidably held with respect to the partition portion 21 and covers the outer periphery of the rotary blade 4. Reference numeral 22a denotes a drive portion side plate that faces the partition portion 21 across the rotary blade 4 and is described later. A back surface side plate of the rotary blade cover portion 22 detachably fixed by screwing to 22b, 22b is a rotary blade cover portion formed in a substantially U-shaped cross section and disposed on the rotary blade drive portion 3 side of the partition portion 21. The drive part side plate 22 and 23 are disposed between the partition part 21 and the drive part side plate 22b of the rotary blade cover part 22 so that the partition part 21 can slide up and down with respect to the rotary blade cover part 22. A slide rail as a sliding guide for guiding, 23a is a partition portion 21 An outer rail of the slide rail 23 as a guide portion fixed to both sides on the drive unit side plate 22b side, 23b is a guide that is fixed on both sides of the drive unit side plate 22b on the partition portion 21 side and slides along the outer rail 23a. The inner rail of the slide rail 23 as a portion, 23c is a ball bearing of the slide rail 23 disposed between the outer rail 23a and the inner rail 23b, and 24 is disposed at two locations on both sides of the bottom of the back plate 22a. Cover cover supporting wheels.

The operation of the dust collecting cover when the rotary blade drive unit of the road surface cutting device according to the first embodiment is raised (moved up and down) and tilted will be described with reference to FIG.
FIG. 6A shows a state when the road surface cutting device 1 of the first embodiment is not used. Although the rotary blade drive part 3 is raised to a height at which the lower end side of the rotary blade 4 does not come into contact with the road surface 50, the entire rotary blade 4 is covered with the dust collecting cover 20, which is excellent in safety. The dust collecting cover 20 can be slid upward by hand, and the replacement part of the rotary blade 4 can be exposed to easily perform the replacement work of the rotary blade 4.
Next, when the rotary blade 4 is lowered by the rotary blade drive unit 3, as shown in FIG. 6B, the lower end side of the rotary blade 4 (the tip of the bottom cutting blade 4a and the side cutting blade 4b) is the road surface 50. The cover support wheel 24 contacts the road surface 50 before contacting the road surface.
When the rotary blade 4 is further lowered, as shown in FIG. 6C, the dust collection cover 20 slides upward, and the lower end side of the rotary blade 4 contacts the road surface 50.
Even if the rotary blade 4 is rotated and the rotary blade 4 is lowered to a predetermined cutting depth as shown in FIG. 6D, the partition portion 21 is slidable with respect to the rotary blade cover portion 22. Since the rotary blade cover portion 22 supported by the cover support wheel 24 that is grounded to the road surface 50 can be stopped and can cover almost the entire circumference of the rotary blade 4, regardless of the cutting depth of the rotary blade 4. It is possible to reliably prevent dust from being scattered around the cut portion.

As shown in FIG. 6 (e), even when the rotary blade driving unit 3 is tilted to cut the road surface 50, the rotary blade cover unit is grounded to the road surface 50 while the cover support wheels 24 are inclined. 22 can be supported, the bottom side of the back plate 22a is not supported on the road surface 50, and the road surface cutting device 1 can be smoothly moved to perform the cutting operation. Moreover, since the cover part support wheel 24 is earth | grounded with the road surface 50, a clearance gap hardly arises between the bottom part of the back surface side plate 22a and the road surface 50, and scattering of dust can be suppressed effectively.
Since the dust collection cover 20 has the partitioning portion 21 that partitions the rotary blade drive unit 3 and the rotary blade 4, dust or the like hardly adheres to the rotary blade drive unit 3, and the maintainability of the rotary blade drive unit 3 is excellent. . Furthermore, since the rotary blade cover portion 22 is disposed so as to cover only the rotary blade 4, dust generated in the rotary blade cover portion 22 is efficiently removed from the suction hose 40 connected to the suction hose connection portion 20a. It can be sucked and collected in a dust collector. The suction hose connection portion 20a may be provided on the upper surface portion or the rear surface portion (back surface side plate 22a) of the rotary blade cover portion 22, but in particular, as in the present embodiment, the suction hose connection portion 20a is provided on the rotary blade cover portion. When the rotary blade 4 is arranged on the side of the upside direction of the rotary blade 4, the dust generated by the cutting is immediately sucked to minimize the scattering of the dust and to reliably suck even the dust having a large particle size. It has excellent environmental protection and dust collection reliability.
In the present embodiment, the slide rail 23 is used as the sliding guide, but the sliding guide is not limited to this, and the partition portion 21 and the rotary blade cover portion 22 are slidable with respect to each other. Anything that can be held is acceptable. Moreover, in this Embodiment, although the slide rail 23 was arrange | positioned inside the rotary blade cover part 22, when it arrange | positions outside the rotary blade cover part 22, dust enters between the outer rail 23a and the inner rail 23b. Can be prevented, and the stability of the operation is excellent.

A method of using the road surface cutting device according to the first embodiment configured as described above when cutting the road surface into an arc will be described.
FIG. 7 (a) is a partially broken plan view showing a state in which the road surface is cut into an arc shape using the road surface cutting device of the first embodiment, and FIG. 7 (b) is a road surface cutting device of the first embodiment. FIG. 8 is a cross-sectional view taken along the line C-C in FIG. 7.
In FIG. 7, 1a is a road surface cutting device to which an arc cutting attachment arm 30a is mounted, and 17a and 17b are axes that serve as tilt centers of the rotary blade 4 at the front side and the forward end of the frame 2, respectively. A mark 31 indicating the cutting position and the traveling direction is arranged in accordance with the horizontal position (point p in FIG. 1) of the support portion 9a (see FIG. 4), and 31 is for arc cutting that is detachably fixed to the attachment arm fixing portion 16. A base part of the attachment arm 30a, 32a is an arm part of the arc cutting attachment arm 30a connected to the base part 31, and 33 is a rotation of the arc cutting attachment arm 30a disposed at a predetermined position in the longitudinal direction of the arm part 32. The center fixing portion 33a is a center hole of the rotation center fixing portion 33, and 33b is screwed to the rotation center fixing portion 33 at an arbitrary position in the longitudinal direction of the arm portion 32. 34a is a hinge that rotatably holds the arm 32 with respect to the base 31, and 34b is an arc cutting attachment disposed at the bottom of the end of the arm 32a opposite to the base 31. Auxiliary wheels of the arm 30a, 60 is a rotation center guide installed on the manhole cover of the road surface 50, and 35 is based on the position of the point p of the rotary blade 4 on the front side of the arm 32 (see FIG. 1). The scale with the horizontal distance is engraved, 61 is a magnet portion for fixing the rotation center guide 60 to the manhole cover, and 62 is standing at the center of the rotation center guide 60 in the center hole of the rotation center fixing portion 33. It is a cylindrical support part to be inserted.
In FIG. 7, the elements other than the frame 2 and the arc cutting attachment arm 30a are omitted.

In FIG. 8, reference numeral 36 denotes a notch engaging portion that is formed at both ends of the base portion 31 of the arc cutting attachment arm 30 a and engages with the fixed shaft 16 a of the attachment arm fixing portion 16.
By simply engaging the notch engaging portion 36 of the base portion 31 with the fixed shaft 16a of the attachment arm fixing portion 16, the arc cutting attachment arm 30a can be easily attached. If the attachment arm fixing portion 16 is used together with fixing means by screwing, the arc cutting attachment arm 30a can be firmly fixed, and the fixing stability is excellent.

As described with reference to FIG. 4, the rotary blade drive unit 3 is tilted to a predetermined angle and further lowered by a predetermined cut depth, and then the frame is moved along an arcuate locus centering on the rotation center fixing unit 33. By moving 2, the road surface 50 can be cut into an arc shape by the rotary blade 4 formed in a truncated cone shape.
Since there is a fixing screw portion 33b for screwing and fixing the rotation center fixing portion 33 at an arbitrary position in the longitudinal direction of the arm portion 32, the turning radius for moving the frame 2 can be easily changed according to the size of the manhole. The radius (rotation radius) of the arc to be cut can be arbitrarily set. At this time, since the scale 36 indicating the horizontal distance based on the position of the point p of the rotary blade 4 (see FIG. 1) is engraved on the side portion on the near side of the arm portion 32, the desired rotation can be easily performed. It can be set to a radius and is excellent in usability.
Note that the position of the point p of the rotary blade 4 serving as the reference of the scale 36 coincides with the horizontal position of the shaft support portion 9a (see FIG. 4) that becomes the center of tilt when the rotary blade 4 is tilted. Even when the rotary blade 4 having a different shape (height from the bottom surface to the top surface of the cone portion or an angle formed between the bottom surface of the cone portion and the inclined surface) is used, the scale 36 is not deviated and the scale 36 is always changed. The cutting operation can be performed with a target almost accurate turning radius as a guide, and it is excellent in versatility and handling. Further, the cutting work can be performed while confirming the traveling direction of the frame 2 by the mark 17b, and the workability is excellent.
Further, since the base portion 31 and the arm portion 32 are rotatably held by the hinge 34, only the arm portion 32 can be folded with the arc cutting attachment arm 30a attached to the frame 2 when not in use. Easy to transport, excellent in handling and space saving.
In the present embodiment, the rotation center guide 60 is described as being fixed to the manhole cover by the magnet unit 61, but may be fixed using the bar hole of the manhole cover. In addition, when the manhole cover is not a magnetic material, or when the rotation center guide 60 is fixed directly to the road surface 50 such as asphalt, a pin that is driven and fixed to the road surface 50 instead of the magnet portion 61 is used. You can also.

Next, a method of using the road surface cutting device of the first embodiment when cutting the road surface into a rectangular shape with rounded corners will be described.
FIG. 9A is a main part plan view showing a state in which the road surface is cut into a rectangular shape with rounded corners using the road surface cutting device according to the first embodiment, and FIG. FIG.
In FIG. 9, 1 b is a road cutting device to which a continuous cutting attachment arm 30 b is attached, 32 b is an arm portion of a continuous cutting attachment arm 30 b provided continuously to the base portion 31, and 37 is disposed at the tip of the arm portion 32 b. The guide wheel holding portion 37a is a rotation shaft disposed on both sides of the guide wheel holding portion 37 in the vertical axis direction of the arm portion 32b, and 37b is rotatably held by the rotation shaft 37a and installed on the road surface 50. A guide wheel that rotates by being fitted to the rail portion 72 of the guide rail 70, 70 is a guide rail that is installed on the road surface 50, and 71 is a guide rail 70 that supports the rail portion 72 formed in a substantially U shape at the bottom. It is the buttocks.
In FIG. 9, the elements other than the frame 2 and the continuous cutting attachment arm 30b are omitted.

As described with reference to FIG. 4, after the rotary blade driving unit 3 is tilted to a predetermined angle and further lowered by a predetermined cutting depth, the frame 2 is moved along the guide rail 70 to form a truncated cone shape. The road surface 50 can be continuously cut by a straight line and an arc by the formed rotary blade 4.
If the guide rail 70 formed in a rectangular shape with rounded corners is used, the road surface 50 around the information box or the like can be cut into a substantially rectangular shape along the shape.
In order to suppress wear of the rotary blade 4 and prolong the service life, the straight portion can be cut with a disc-like rotary blade and the arc portion can be cut with a frustoconical rotary blade 4. At this time, the approach direction of the side cutting blade 4b of the frustoconical rotary blade 4 used for cutting the arc portion to the road surface 50 is parallel to the ascending / descending direction of the rotary blade drive unit 3 as shown in FIG. If the angle formed by the approaching direction of the side cutting blade 4b and the road surface 50 is 90 degrees, the cutting start position is shifted when the straight portion is cut by exchanging with a disk-shaped rotary blade. Therefore, it is possible to perform cutting with high accuracy in which the linear portion and the arc portion are continuous.

The guide rail 70 can be formed into a desired shape to be cut. If a guide rail formed in an arc shape is used, the road surface can be used even with the continuous cutting attachment arm 30b without using the arc cutting attachment arm 30a. 50 can be cut into an arc.
In addition, if the guide rail is replaced with a disk-shaped rotary blade and is formed in a linear shape, the road surface 50 can be linearly cut even with the continuous cutting attachment arm 30b. In particular, when a straight guide rail is used when the straight distance to be cut is long, the road surface 50 can be cut accurately in a straight line without being skewed, and the reliability is excellent. Further, in this embodiment, the guide wheel 37b moves in the groove of the rail portion 72. However, instead of the guide rail 70, a single flat bar is used, and the front and rear of the flat bar in the longitudinal direction 2 You may make it move so that a location may be pinched | interposed with a cam follower or a tire from both right and left sides.

Next, a method of using the road surface cutting apparatus according to the first embodiment when cutting the road surface in a straight line will be described.
FIG. 10A is a main part plan view showing a state in which a road surface is cut linearly using the road surface cutting device of the first embodiment, and FIG. 10B is a view using the road surface cutting device of the first embodiment. It is a principal part side view which shows a mode that a road surface is cut | disconnected linearly.
In FIG. 10, 1c is a road surface cutting device to which the straight cutting attachment arm 30c is attached, 32c is an arm portion of the straight cutting attachment arm 30c disposed on both sides of the base 31, and 38 is between the arm portions 32c. The provided wheel holding portion 38 a is a straight traveling wheel using fixed casters disposed at two positions in the front and rear of the bottom portion of the wheel holding portion 38.
In FIG. 10, the elements other than the frame 2 and the straight cutting attachment arm 30c are omitted.

As described with reference to FIG. 4, after the rotary blade drive unit 3 is tilted to a predetermined angle and further lowered by a predetermined cutting depth, the frame 2 is moved in the traveling direction of the straight traveling wheel 38a, and the road surface 50 is moved. It can be cut straight.
When cutting the road surface 50 in a straight line, a disk-shaped rotary blade may be used instead of the frustoconical rotary blade 4 described above. In addition, when using a disk-shaped rotary blade, it is not necessary to tilt the rotary blade drive part 3, but it can cut | disconnect (slant cutting) so that a cut surface may become diagonal by giving an angle.
Since the straight traveling wheel 38a is a fixed caster, the frame can be smoothly moved straight without changing the traveling direction. In particular, by providing the straight traveling wheels 38a at the two front and rear positions of the wheel holding portion 38, the straight traveling performance can be improved, and the movement and cutting operation stability is excellent.

As described above, the road surface cutting device according to Embodiment 1 has the following effects.
(1) A rotary blade drive unit to which a rotary blade formed in a truncated cone shape or a disc shape is detachably mounted, and a plurality of attachment arms that are selectively mounted on the attachment arm fixing unit and restrict the moving direction of the frame. Therefore, depending on the shape of the road surface to be cut, the types of rotary blades and attachment arms can be selected and combined, and the road surface can be cut into a desired shape easily and reliably. Excellent. In particular, when the road surface is cut into an arc shape, a frustoconical rotation whose height from the bottom surface to the top surface of the cone portion or the angle between the bottom surface of the cone portion and the inclined surface is optimal according to the diameter of the arc to be cut. By selecting the blade, it is possible to cut the road surface smoothly without imposing a load on the rotary blade, and to greatly reduce the wear of the rotary blade, and the long life of the rotary blade is excellent.
(2) Since the frame has an elevating mechanism that holds the rotary blade drive unit up and down freely, the rotary blade drive unit is moved up and down by the elevating mechanism to arbitrarily set the cutting depth of the rotary blade, and the road surface is desired It can be cut at a depth of, and is easy to handle.
(3) Since the moving wheel disposed at the bottom of the frame is provided, it can be easily moved manually when the road surface is cut or transported, resulting in excellent labor saving.
(4) Since there is a tilt holding mechanism that tiltably holds the rotary blade drive unit with respect to the lifting mechanism, the rotary blade drive unit is tilted by the tilt holding mechanism to arbitrarily set the approach angle of the rotary blade with respect to the road surface. It can be used and has excellent versatility. In particular, when the road surface is cut by a conical rotary blade, the angle formed by the side cutting blade (inclined surface) of the rotary blade and the road surface is 90, even if the dimensional shape (inclination angle of the conical portion) of the rotary blade is different. If the rotary blade drive part is tilted so that the angle is higher, the vertical direction of the rotary blade and the approach direction of the side cutting blade of the rotary blade become parallel, so the road surface can be smoothed without applying a load to the rotary blade. By cutting, the wear of the rotary blade can be significantly reduced, and the long life of the rotary blade is excellent. In addition, even when the blade is replaced with a rotary blade having a different size and shape according to the radius of the arc to be cut, the cutting start position does not change, and the road surface can be cut with a proper arc easily and reliably. Excellent versatility.
(5) Since the attachment arm fixing portion formed on the frame is provided, the attachment arm can be easily attached and detached, the attachment arm can be easily replaced and maintained, and the handleability and maintainability are excellent.
(6) Since one of the plurality of attachment arms is an arc cutting attachment arm, the circumference of a circular installation such as a manhole can be cut into a circle, and the road surface is cut into a square shape with a straight cutter. Compared to the case, the man-hours can be reduced, the corners are not cut off, the strength and durability of the road surface can be secured, the amount of waste such as asphalt generated by cutting, the roadbed material necessary for repair, etc. The amount of materials can be reduced, and it is excellent in environmental protection and resource saving.
(7) Since the rotation center fixing portion held by the rotation center guide installed on the road surface is disposed on the arm portion connected to the base, an arc shape centered on the rotation center guide Since the frame can be moved along the trajectory, the road surface can be easily and surely cut into an arc shape by the rotary blade formed in a truncated cone shape, and the handleability is excellent.
(8) Since the attachment arm for cutting the arc has an auxiliary wheel disposed at the bottom of the end opposite to the base side of the arm, the arm can be supported substantially horizontally, Prevents horizontal load from being generated at the base of the attachment arm and the center of rotation, and enables smooth circular movement around the center of rotation, which is excellent in operational stability and usability. .
(9) Since one of the plurality of attachment arms is an attachment arm for continuous cutting, the road surface can be continuously cut into a complicated shape such as a square with a rounded corner or a curve, and a shape in which straight lines and arcs are continuous. Even so, there is no need to cut intermittently by using different rotary blades at the straight part and the arc part, and the work man-hours can be greatly reduced, and the cutting shape is flexible and labor-saving.
(10) An attachment arm for continuous cutting has two guide wheels that are supported by a guide rail that is pivotally supported by a vertical axis of an arm portion that is connected to a base portion and is installed on a road surface. Since the frame can be moved along the guide rail formed in the shape, the road surface can be easily and reliably cut continuously with straight lines and arcs by the rotary blade formed in a truncated cone shape. Excellent in properties.
(11) Since one of the plurality of attachment arms is an attachment arm for straight line cutting, the frame can be surely moved straight and the road surface can be cut into a straight line. It is necessary to prepare a cutter for straight line cutting separately. It can also be used for manhole installation work, pipe construction such as gas pipes and water pipes, repairing and inspection work for pipes that have already been buried, and is excellent in workability and handling.
(12) The straight cutting attachment arm has a straight traveling wheel disposed at the bottom of the arm portion connected to the base portion so as to be able to travel straight in the horizontal axis direction perpendicular to the rotation axis of the rotary blade drive unit, Since the frame can be moved along the guide rail formed in a desired shape, the road surface can be cut continuously and straightly with straight lines and arcs by the rotary blade formed in the shape of a truncated cone. Excellent handleability.
(13) Since the dust collection cover is provided in the rotary blade drive unit and has a partition part that partitions the rotary blade drive unit and the rotary blade, dust or the like hardly adheres to the rotary blade drive unit, and the rotary blade drive unit Excellent maintainability.
(14) Since the dust collection cover includes a rotary blade cover portion that covers the outer periphery of the rotary blade, and the suction blade connection portion to which the suction hose of the dust collector is connected to the rotary blade cover portion, The dust generated by cutting can be prevented from scattering outside the rotary blade cover part, and the dust generated in the rotary blade cover part is efficiently sucked from the suction hose connected to the suction hose connection part and collected in the dust collector. It is easy to clean after cutting work and has excellent environmental protection.
(15) Since the suction hose connection part to which the suction hose of the dust collector is connected is formed on the rotary blade cover part of the dust collection cover, the suction hose of the dust collector can be easily connected and is generated at the time of cutting. It is possible to perform cutting work while collecting dust, which not only excels in stability of cutting work and efficiency of dust collection, but also removes the suction hose when not in use and transports and stores the dust collector separately. It can be used for cleaning work, and is highly versatile.
(16) Since the partition portion of the dust collecting cover is slidably disposed on the rotary blade cover portion, the rotary blade cover can be moved even if the partition portion moves up and down as the rotary blade drive portion moves up and down. The part can be held in place to cover almost the entire surface of the rotary blade, and dust can be reliably prevented from scattering around the cutting point regardless of the cutting depth of the rotary blade. Excellent.
(17) Since the cover portion support wheel is disposed at the bottom of the back plate of the rotary blade cover portion facing the partition portion, while supporting the rotary blade side cover portion with the cover portion support wheel, The resistance can be reduced and smooth movement is possible, and the workability is excellent.
(18) Since the suction hose connection part of the dust collection cover is disposed on the side of the rotary blade cover part on the side of the rotary blade being cut up, dust generated by cutting is connected to the suction hose connection part. Suction can be immediately suctioned from the suction hose to minimize dust scattering, and even dust with large particles can be reliably sucked, providing excellent environmental protection and dust collection reliability.
(19) Since the rotary blade can be moved up and down (lifted) together with the rotary blade drive unit by the lifting mechanism, when using the rotary blade formed in a truncated cone shape, the rotary blade drive unit is moved by the tilt holding mechanism. By tilting, the angle of entry of the side cutting blades into the road surface can be arbitrarily set, and the road surface can be cut into a linear shape or a circular arc shape with an inclined cross section. In particular, when using a rotary blade formed in a truncated cone shape, if the approach angle of the side cutting blade to the road surface is 90 degrees, the width of the bottom cutting blade is effectively used to cut the road surface wide. Therefore, it is difficult for friction to occur between the outer surface (side cutting blade) or inner peripheral surface (back surface side) of the rotary blade and the cut surface, and the wear of the rotary blade can be effectively reduced. Excellent durability and long life of rotary blades.
(20) The lowest point where the upper surface and the inclined surface of the rotary blade formed in a frustoconical shape mounted on the rotary blade drive section intersect is the reference surface in the height direction of the vertical movement by the lifting mechanism and the tilt holding When the rotary blade formed in the shape of a truncated cone is used by being located on the horizontal axis where the central axis of tilting by the mechanism intersects, the height from the bottom surface to the top surface of the cone portion or the cone portion Even if the rotary blade has a different angle between the bottom and the inclined surface, the rotary blade is always based on the lowest point (the lowest point of the root (folding point) of the rotary blade) where the upper surface and the inclined surface of the rotary blade intersect. Since the drive unit can be moved up and down or tilted, the cutting depth and approach angle of the rotary blade can be easily managed, and the approach direction of the rotary blade can always be adjusted appropriately regardless of the radius of the arc to be cut. Excellent in workability and versatility.
(21) By using the lowest point where the upper surface and inclined surface of the rotary blade formed in the shape of a truncated cone intersect as a reference for the horizontal position, the dimensional shape (the height from the bottom surface of the cone portion to the upper surface or the cone) Even if a rotating blade with a different angle (the angle between the bottom surface and the inclined surface) is used, the scale engraved on the arm part of the arc cutting attachment arm will not be distorted. The cutting work can be performed with an almost accurate turning radius (appropriate arc), and is excellent in versatility and handling.

(Embodiment 2)
A road cutting cutter blade according to Embodiment 2 of the present invention will be described below with reference to the drawings.
FIG. 11 is a schematic cross-sectional view of the relevant part showing a bottom cutting blade of a cutter blade for cutting a road surface according to the second embodiment.
In FIG. 11, 4A is a cutter blade for road surface cutting formed in a frusto-conical shape and is mounted on the rotary blade drive unit 3 of the road surface cutting device 1 of Embodiment 1 as a rotary blade, and 4 'is a cutter blade for road surface cutting. 4A frame body. In addition, the broken line shown on the white bottom cutting blade 4a represents the progress of wear. The wear of the bottom cutting blade 4a will be described later.
In the cutter blade 4A for cutting a road surface according to the second embodiment, a bottom cutting blade 4a is formed on the periphery of the bottom of the frame body 4 ', and the protrusion amount t2 on the surface side of the bottom cutting blade 4a with respect to the frame body 4' It is formed larger than the protruding amount t1 on the side.
The protrusion amount t2 on the front surface side of the bottom cutting blade 4a with respect to the frame main body 4 ′ depends on the height of the blade of the bottom cutting blade 4a (the length of the cone in the direction of the generatrix) and the protrusion amount t1 on the back surface side. 2 to 30 times the protrusion amount t1. If the front-side protrusion amount t2 is smaller than twice the rear-surface-side protrusion amount t1, the surface side of the bottom cutting blade 4a is quickly worn out, lacks long life, and if it exceeds 30 times, the productivity, This is because the resource-saving property is remarkably lowered and the usability is lacking.

As described above, the reason why the protrusion amount t2 on the front surface side of the bottom cutting blade 4a with respect to the frame body 4 'must be formed larger than the protrusion amount t1 on the rear surface side will be described.
FIG. 12A is a schematic side view of a main part showing a state in which an arc is cut using the road cutting cutter blade of the second embodiment, and FIG. 12B shows the road cutting cutter blade of the second embodiment. It is a principal part schematic top view which shows the state which uses and cut | disconnects a circular arc.
In FIG. 12, reference numeral 51 denotes a cutting circle cut by the road surface cutting cutter blade 4A.
When the road surface cutting cutter blade 4A according to the second embodiment is used to cut the road surface into an arc shape using the road surface cutting device 1 according to the first embodiment, as shown in FIG. The cutting blade 4A for cutting the road surface is tilted so that the generatrix of the conical section and the road surface 50 form a right angle, and cutting is started.

At this time, as shown in FIG. 12 (b), if the curvature of the conical portion of the cutting blade 4A for cutting the road surface and the curvature of the cutting circle 51 substantially coincide with each other on the cut surface (the surface of the road surface 50), the road surface. It becomes difficult to apply a load to the cutting blade 4A for cutting. The curvature of the conical part varies depending on the position in the height direction. The curvature is smaller on the bottom side and larger on the upper side. Therefore, when cutting an arc with a large curvature, the amount of cut is reduced and the curvature is small. When cutting the arc, the cutting amount may be increased.
However, even if the curvature of the conical portion of the cutter blade 4A for cutting the road surface matches the curvature of the cutting circle on the surface of the road surface 50, the curvature of the conical portion entering the inside of the road surface 50 is the cut surface (surface of the road surface 50). Unlike the curvature of the cutting circle 51, the curvature is smaller on the bottom surface side (the tip side of the bottom cutting blade 4a), so the load generated during cutting also increases on the bottom surface side (the tip side of the bottom cutting blade 4a). Therefore, the front end side of the bottom cutting blade 4a wears out simultaneously with the surface side wear. At this time, the load is larger on the bottom side (front end side of the bottom cutting blade 4a), so the front end side of the bottom cutting blade 4a (bottom surface of the cone). Side) is increased, and the amount of wear on the upper surface side of the cone is reduced. As a result, the surface of the bottom cutting blade 4a wears in a tapered shape from the tip side as shown by a broken line in FIG. It will be.
If the depth of cut is deep, an arc having a large curvature can be cut. However, if there is not enough thickness on the surface side of the bottom cutting blade 4a, the frame body 4 'is cut at some point. In order to prevent this and wear the bottom cutting blade 4a efficiently, the protrusion amount t2 on the front surface side of the bottom cutting blade 4a is 2 to 30 times, preferably 3 times the protrusion amount t1 on the back surface side. It is necessary to form 10 to 10 times.

As described above, the road surface cutting cutter blade according to the second embodiment has the following effects.
(1) Since it has a frame main body formed in a frustoconical shape and a bottom cutting blade formed on the periphery of the bottom of the frame main body, the road surface can be formed into an arc shape only by rotating the road surface cutting device around the rotation center. It can be cut and has excellent usability.
(2) Since the protrusion amount on the surface side of the bottom cutting blade with respect to the frame body is formed larger than the protrusion amount on the back surface side, even if the surface side of the bottom cutting blade is worn in a taper shape due to a load during cutting, The frame body is not cut, the tip side and the surface side of the bottom cutting blade are worn in a well-balanced manner, and a constant cutting ability can be maintained, and the long life and cutting reliability are excellent.

Hereinafter, the present invention will be specifically described by way of examples.
Example 1
A cutter blade 4A for cutting a road surface suitable for cutting a cutting circle 51 having a cutting depth of 45 mm and a diameter of 500 mm was produced. The dimensions of each part are as follows: the diameter of the top surface of the conical part is 54 mm, the diameter of the bottom part is 175.5 mm, the length of the conical part bus is 63.59 mm, the height of the conical part is 18.9 mm, and the cutting edge of the bottom cutting blade 4a is Height (cone generatrix length) 7.6 mm, frame body thickness 1.6 mm, bottom cutting blade 4 a thickness 2.5 mm, bottom surface cutting edge 4 a protrusion t1 = 0.2 mm, bottom The protrusion amount t2 on the surface side of the cutting blade 4a is 0.7 mm.
Using this road surface cutting cutter blade 4A, a cutting circle 51 having a cutting depth of 45 mm and a diameter of 500 mm was repeatedly cut.

FIG. 13 is a diagram showing the relationship between the cutting distance and the wear of the bottom cutting blade.
In FIG. 13, the horizontal axis is the cutting distance (m) cut by the road surface cutting cutter blade 4A, the vertical axis is the size (mm) of each part of the bottom cutting blade 4a, and the black circles plot the bottom cutting blade 4a. The height (mm) of the blade, plotted with a black triangle, shows the thickness (mm) of the bottom cutting blade 4a.
From FIG. 13, during the first 20 m cutting, the thickness of the bottom cutting blade 4 a is reduced from 2.5 mm to 2.2 mm while the height of the bottom cutting blade 4 a is decreased from 7.6 mm to 4.5 mm. It turns out that it is decreasing.
From this result, while the cutting is properly performed by the road surface cutting cutter blade 4A, the wear amount of the blade in the thickness direction of the bottom cutting blade 4a is about 1/10 of the wear amount in the height direction. It can be said.
Therefore, the thickness of the bottom cutting blade 4a is reduced by about 0.7 mm before the height of the bottom cutting blade 4a is reduced by about 7 mm. Considering the thickness variation of the bottom cutting blade 4a, if the protrusion amount t1 on the back surface side of the bottom cutting blade 4a is set to 0.1 mm to 0.3 mm, a wear amount of 0.7 mm is added to this and a further safety factor is expected. The protruding amount t2 on the surface side at that time is about 0.9 mm to 1 mm. Therefore, if the protrusion amount t2 on the front surface side of the bottom cutting blade 4a with respect to the frame body 4 ′ is formed to be 3 to 10 times the protrusion amount t1 on the back surface side, it is ensured that the surface side of the bottom cutting blade 4a is worn first. It seems that the tip side and the surface side of the bottom cutting blade 4a are worn in a well-balanced manner, and it is possible to maintain a substantially constant cutting ability until the end of its life, thereby improving long life and cutting reliability. It is.

FIG. 14 is a diagram illustrating a state in which an arc is cut using the road surface cutting cutter blade according to the first embodiment.
As shown in FIG. 14, by appropriately selecting the shape of the cutter blade for cutting the road surface, the depth of cut, and the curvature of the cutting circle, the curvature of the cone portion of the cutter blade for cutting the road surface and the curvature of the cutting circle are substantially matched. The load on the cutter blade for road surface cutting can be reduced and the arc can be cut reliably and efficiently.

  According to the present invention, by selecting and exchanging parts according to the shape to be cut, the rotary blade is moved in a desired direction, and the road surface is cut into a straight shape, an arc shape, or a shape in which a straight line and an arc are combined. It can be used, has excellent versatility, efficiently cuts around the installed objects on the road surface without waste, minimizes the cutting range, and the amount of materials such as asphalt waste and roadbed materials required for repair In addition to being excellent in environmental protection and resource saving, it is possible to efficiently collect dust generated during cutting and prevent dust from adhering to the rotary blade drive unit. Provide excellent road maintenance, maintainability, can reliably suck even dust with large particle size, provide a road surface cutting device with excellent dust collection reliability, and can cut the road surface into a circular arc with a desired radius. Road surface cutting cap with excellent service life A single road surface cutting device can be used for various purposes such as manhole installation work, pipe construction such as gas pipes and water pipes, repair of existing pipes and inspection work, etc. It can be used properly.

Side view of the road surface cutting device according to the first embodiment. 1 is a cross-sectional view taken along line AA in FIG. 2 is a cross-sectional view taken along line BB in FIG. The principal part cross-section side view which shows the state which inclined the rotary blade drive part of the road surface cutting device of Embodiment 1. FIG. FIG. 2 is a schematic cross-sectional plan view of an essential part showing a dust collection cover of the road surface cutting device according to the first embodiment. Cross-sectional side view of main parts showing a dust collection cover of the road surface cutting device according to the first embodiment. (A) Partially broken plan view showing how the road surface is cut into an arc shape using the road surface cutting device of the first embodiment (b) The road surface is cut into an arc shape using the road surface cutting device of the first embodiment Side view of the main part showing how to do CC sectional view taken along the line CC in FIG. (A) Main part top view which shows a mode that a road surface is cut | disconnected in the rectangular shape with a rounded corner using the road surface cutting device of Embodiment 1, (b) DD side arrow sectional side view of Fig.9 (a) (A) Main part top view which shows a mode that a road surface is cut | disconnected linearly using the road surface cutting device of Embodiment 1 (b) A mode that a road surface is cut | disconnected linearly using the road surface cutting device of Embodiment 1 Side view of the main part showing Cross-sectional schematic diagram of relevant parts showing the bottom cutting blade of the cutter blade for road surface cutting according to the second embodiment. (A) Main part schematic side view showing a state of cutting an arc using the road surface cutting cutter blade of the second embodiment (b) State of cutting an arc using the road surface cutting cutter blade of the second embodiment Main part schematic plan view Diagram showing the relationship between the cutting distance and the wear of the bottom cutting blade The figure which shows the state which cut | disconnects a circular arc using the cutter blade for road surface cutting of Example 1. FIG.

Explanation of symbols

1, 1a, 1b, 1c Road surface cutting device 2 Frame 2a Moving wheel 2b Handle 3 Rotating blade drive unit 4 Rotating blade 4 'Frame body 4A Road surface cutting cutter blade 4a Bottom cutting blade 4b Side cutting blade 5 Lifting mechanism 6 Guide Shaft 7 Screwing shaft 7a Male screw portion 7b Lifting operation handle 8 Lifting portion 8a Guide portion 8b Screwing portion 8c Support arm 9 Cutter holding portion 9a Shaft support portion 9b Cutter fixing portion 9c, 9d Fixed screw 10 Tilt holding mechanism 11 Connecting shaft 12 Connection shaft guide portion 13 Connection holding portion 14 Digital position indicator 14a Screw lock portion 15 Tilt operation handle 16 Attachment arm fixing portion 16a Fixing shaft 16b Fixing protrusions 17a and 17b Marking 20 Dust collecting cover 20a Suction hose connection portion 21 Partition Part 21a Bent part 22 Rotary blade cover part 22a Back side plate 22b Drive part Plate 23 Slide rail 23a Outer rail 23b Inner rail 23c Ball bearing 24 Cover part support wheel 30a Arc cutting attachment arms 31a, 31b, 31c Base parts 32a, 32b, 32c Arm part 33 Rotation center fixing part 33a Center hole 33b Fixing screw part 34a Hinge 34b Auxiliary wheel 35 Scale 36 Notch engaging part 37 Guide wheel holding part 37a Rotating shaft 37b Guide wheel 38 Wheel holding part 38a Straight traveling wheel 40 Suction hose 50 Road surface 51 Cutting circle 60 Rotation center guide 61 Magnet part 62 Support Part 70 guide rail 71 collar part 72 rail part

Claims (10)

A rotary blade drive unit to which a rotary blade formed in a truncated cone shape or a disc shape is detachably mounted, a frame having an elevating mechanism that holds the rotary blade drive unit up and down, and a bottom portion of the frame Fixed are a moving wheel, a tilt holding mechanism that tiltably holds the rotary blade driving unit with respect to the lifting mechanism, and an attachment arm that is formed in the frame and restricts the moving direction of the frame. A road surface cutting device comprising: an attachment arm fixing portion. The attachment arm is held by a base part that is detachably fixed to the attachment arm fixing part, an arm part that is connected to the base part, and a rotation center guide that is disposed on the arm part and is installed on the road surface. A rotation center fixing portion that moves the frame along an arcuate locus centering on the rotation center fixing portion, and the road surface is formed in an arc shape by the rotary blade formed in a truncated cone shape. The road surface cutting device according to claim 1, further comprising an arc cutting attachment arm that cuts into an arc. The road surface cutting device according to claim 2, wherein the arc cutting attachment arm includes an auxiliary wheel disposed at a bottom portion of an end portion of the arm portion opposite to the base side. The attachment arm is fitted to a base portion that is detachably fixed to the attachment arm fixing portion, an arm portion that is connected to the base portion, and a guide rail that is pivotally supported by a vertical axis of the arm portion and is installed on a road surface. And two guide wheels that rotate together, move the frame along the guide rail, and continuously cut the road surface with a straight line and an arc by the rotary blade formed in a truncated cone shape. The road surface cutting device according to claim 1, further comprising an attachment arm for continuous cutting. As the attachment arm, a base part detachably fixed to the attachment arm fixing part, an arm part connected to the base part, and a horizontal axis perpendicular to the rotation axis of the rotary blade driving part at the bottom of the arm part A straight traveling wheel disposed so as to be able to travel straight in a direction, and the frame is moved in a traveling direction of the straight traveling wheel, and the road surface is moved by the rotary blade formed in a truncated cone shape or a disk shape. The road surface cutting device according to claim 1, further comprising an attachment arm for straight line cutting that cuts in a straight line. Formed in the rotary blade cover portion, a partition portion disposed in the rotary blade drive portion and partitioning the rotary blade drive portion and the rotary blade, a rotary blade cover portion covering the outer periphery of the rotary blade, and the rotary blade cover portion A road surface cutting device according to any one of claims 1 to 5, further comprising a dust collection cover having a suction hose connection portion to which a suction hose of the dust collector is connected. The partition portion of the dust collecting cover is slidably disposed on the rotary blade cover portion, and the rotary blade cover portion is disposed on a bottom portion of the back side plate facing the partition portion with the rotary blade interposed therebetween. The road surface cutting device according to claim 6, further comprising a cover support wheel disposed. The road surface according to claim 6 or 7, wherein the suction hose connection portion of the dust collection cover is disposed on a side portion or an upper portion of the rotary blade cover portion on the side of the rotary blade that is cut up. Cutting device. The lowest point where the upper surface and the inclined surface of the rotary blade formed in a frustoconical shape mounted on the rotary blade drive unit intersect is the reference surface in the height direction of the vertical movement by the lifting mechanism and the tilt holding The road surface cutting device according to any one of claims 1 to 8, wherein the road surface cutting device is located on a horizontal axis intersecting with a central axis of tilting by the mechanism. A rotary blade formed in a frustoconical shape, comprising a frame main body formed in a frustoconical shape, and a bottom cutting blade formed in a bottom peripheral edge of the frame main body, and A cutter blade for road surface cutting, characterized in that the protrusion amount on the front surface side of the bottom cutting blade is formed larger than the protrusion amount on the back surface side.