Road surface milling machine

Abstract

To provide a road surface milling machine for cutting with a road surface cutting device the asphalt paved road surface of which a surface layer is superimposed on a base layer, which cuts the surface layer by shifting from the base layer in the cutting width direction and can reduce cutting time.SOLUTION: A road surface milling machine is equipped with a road surface milling device 20, mills with this road milling device 20 the road surface of asphalt pavement 60, which has a surface layer 61 layered on a base layer 62. The road surface milling device 20 includes a cylindrical drum 21 whose rotation axis 24 is arranged parallel to the road surface during cutting, and a cutting bit 22 which protrudes from the outer circumferential surface of the drum 21 and cuts the road surface. The cutting bit 22 includes a base layer cutting bit 32 for cutting the base layer 62 and the surface layer 61, and a surface layer cutting bit 42 for cutting only the surface layer 61 on the outer side of the base layer cutting bit 32 in the cutting width direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a road cutting machine that cuts the surface and discharges the cutting material in repair work of an asphalt-paved road surface or the like.

Background Art

[0002] Conventionally, in a paved road surface such as a road, a composite material (asphalt mixture) in which asphalt is mixed with an aggregate made of crushed stone, sand, etc. is spread evenly and compacted. Specifically, as shown in FIG. 1(A), the asphalt pavement 60 is composed of a surface layer 61, a base layer 62, an upper roadbed 63, and a lower roadbed 64 from the road surface side, and is constructed on a roadbed 65. The surface layer 61 is at the uppermost part, disperses the load received from a tire or the like, and has a function as a road surface such as traffic comfort. The base layer 62 is on the roadbed (upper roadbed 63), and has a function of properly leveling the unevenness of the roadbed and uniformly transmitting the load applied to the surface layer 61 to the roadbed. The roadbed (upper roadbed 63, lower roadbed 64) is on the roadbed 65, uniformly supports the surface layer 61 and the base layer 62, and has a function of dispersing the load due to traffic transmitted from above and transmitting it to the roadbed 65.

[0003] Asphalt pavements such as those of roads and bridges are used for a long time, and cracks, undulations, and other deteriorations occur due to vehicle running, so repair work is required.

[0004] The repair of this asphalt pavement is generally carried out by a dedicated road cutting machine (road cutting vehicle) called a road cutter, as shown in FIG. 1(B). After cutting and removing the surface layer 61 and the base layer 62 of the old asphalt pavement, as shown in FIG. 1(C), a method of applying a new asphalt pavement (surface layer 61a, base layer 62b) on the cut and removed surface is taken. As a road cutting machine used for such asphalt pavement repair work, the road cutting machine of Patent Document 1 is known.

[0005] The road milling machine for milling the asphalt pavement of Patent Document 1 includes a self-propelled vehicle, a milling drum disposed at the bottom with a rotation axis extending in the left-right direction, an actuator for moving the milling drum in the vertical direction with respect to the self-propelled vehicle, an electromagnetic wave radar for measuring the thickness of the asphalt pavement before being milled by the milling drum, and a controller incorporating a microcomputer. Then, as the self-propelled vehicle travels, while controlling the actuator according to the thickness of the asphalt pavement measured by the electromagnetic wave radar, the milling drum is rotationally driven to mill and remove the asphalt pavement.

[0006] As shown in FIGS. 7(B) and 7(C), in the repair work of the asphalt pavement, since it is necessary to prevent water and the like from infiltrating from the joint portion between the old asphalt pavement and the new asphalt pavement, the surface layer 61 is cut with an extra shift of about 15 cm more than the base layer 62 to form a stepped shape (also called step cutting). Then, a new base layer 62a is repaved on the cutting portion including this stepped shape portion so as to coincide with the stepped shape portion, and further, a new surface layer 61a is repaved on the base layers 62a and 62 so as to coincide with the old road surface (old surface layer 61).

[0007] By the way, during the repair work of the asphalt pavement, the lane of the road cannot be used, so it is required to take measures such as repair work at night with less traffic volume and completion of the repair work in a short time (construction period) so as to minimize the impact on road traffic.

[0008] However, since the milling drum of the road milling machine of Patent Document 1 for milling the old surface layer and the base layer has a cylindrical shape, in order to cut the surface layer with an extra shift of about 15 cm more than the base layer, after traveling once to mill the surface layer and the base layer, it is necessary to raise the height of the milling drum by 5 cm and shift the position in the milling width direction by about 15 cm, and then travel again at substantially the same paving end to mill only the surface layer. For this reason, the same paving end needs to be traveled twice only for milling, so the time for the repair work becomes long.

Prior Art Documents

Patent Documents

[0009] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2022-114235 [Summary of the Invention] [Problems to be Solved by the Invention]

[0010] In view of the above points, the present invention is a road surface cutting machine that cuts an asphalt pavement with a surface layer superimposed on a base layer using a road surface cutting device. After cutting the surface layer while shifting it in the cutting width direction from the base layer, it is an object of the present invention to provide a road surface cutting machine capable of shortening the cutting time. [Means for Solving the Problems]

[0011] According to an embodiment of the present invention, there is provided a road surface cutting machine that cuts an asphalt pavement with a surface layer superimposed on a base layer using a road surface cutting device, The road surface cutting device includes a cylindrical drum having a rotation axis arranged parallel to the road surface during cutting, and a cutting bit provided to protrude from an outer peripheral surface of the drum to cut the road surface. The cutting bit includes a cutting bit for the base layer that cuts the base layer and the surface layer, and a cutting bit for the surface layer that cuts only the surface layer outside the cutting width direction of the cutting bit for the base layer, which is characterized.

[0012] According to such a configuration, in the road surface cutting device of the road surface cutting machine, the cutting bits provided to protrude from the outer peripheral surface of the drum include cutting bits for the base layer that cut the base layer and the surface layer, and cutting bits for the surface layer that cut only the surface layer on the outer side in the cutting width direction of the cutting bits for the base layer. Therefore, when the road surface cutting machine travels once, the base layer and the surface layer are cut by the cutting bits for the base layer, and only the surface layer is cut by the cutting bits for the surface layer on the outer side in the cutting width direction of the cutting bits for the base layer. In this way, in one travel of the road surface cutting machine, a cutting portion for only the surface layer is formed adjacent to the cutting portions of the base layer and the surface layer. Therefore, the surface layer can be stepped and cut with a shift in the cutting width direction from the base layer, and the cutting time can be shortened. Further, when performing stepped cutting of old asphalt paving, since the stepped cutting is completed by simply running the road surface cutting machine once, the fuel of the road surface cutting machine, which is a construction machine (heavy machine), is also sufficient for one travel, and the environmental load can be reduced.

[0013] Preferably, the drum includes a large-diameter drum having a large diameter with the cutting bits for the base layer, and a small-diameter drum having a diameter smaller than that of the large-diameter drum provided coaxially adjacent to the large-diameter drum and having the cutting bits for the surface layer that cut the surface layer.

[0014] According to such a configuration, since the drum is composed of a large-diameter drum having a large diameter and a small-diameter drum having a diameter smaller than that of the large-diameter drum provided coaxially adjacent to the large-diameter drum, in one travel of the road surface cutting machine, the surface layer and the base layer are stepped and cut by the cutting bits for the base layer of the large-diameter drum and the cutting bits for the surface layer of the small-diameter drum, and the cutting time can be shortened.

[0015] Preferably, the cutting bits for the base layer and the cutting bits for the surface layer are provided on the outer peripheral surface of the same drum, and the protruding length of the cutting bits for the base layer from the drum is set to be larger than the protruding length of the cutting bits for the surface layer from the drum.

[0016] According to such a configuration, since the cutting bits for the base layer and the cutting bits for the surface layer with different protruding lengths are provided adjacent to the outer peripheral surface of the same drum, the base layer can be deeply cut with the cutting bits for the base layer, and only the surface layer can be shallowly cut with the cutting bits for the surface layer. By step-cutting the surface layer and the base layer in one pass of the road surface cutting machine, the cutting time can be shortened.

[0017] Preferably, the drum comprises a main drum with a large diameter having the cutting bits for the base layer, and a sub-drum provided separately from the main drum on the outer side in the cutting width direction of the main drum with a different axis and having the cutting bits for the surface layer.

[0018] According to such a configuration, the drum comprises a main drum with a large diameter having the cutting bits for the base layer, and a sub-drum provided separately from the main drum on the outer side in the cutting width direction of the main drum with a different axis and having the cutting bits for the surface layer. Therefore, the base layer can be deeply cut with the cutting bits for the base layer of the main drum, and only the surface layer can be shallowly cut with the cutting bits for the surface layer of the sub-drum. By step-cutting the surface layer shifted in the cutting width direction from the base layer in one pass of the road surface cutting machine, the cutting time can be shortened.

[0019] Preferably, the drum comprises a fixed drum with a fixed cutting width direction having the cutting bits for the base layer, and a moving drum provided separately from the fixed drum on the outer side in the cutting width direction of the fixed drum with a different axis and axially movable and having the cutting bits for the surface layer, and a moving mechanism for moving the moving drum in the drum width direction is provided.

[0020] According to such a configuration, the drum is composed of a fixed drum having cutting bits for the base layer and a moving drum provided separately on a different axis from the fixed drum and axially movable to the outside in the cutting width direction of the fixed drum and having cutting bits for the surface layer. Since it is provided with a moving mechanism for moving this moving drum in the drum width direction, by moving the moving drum to the outside in the cutting width direction of the fixed drum with the moving mechanism, the base layer can be deeply cut with the cutting bits for the base layer of the fixed drum, and only the surface layer can be shallowly cut with the cutting bits for the surface layer of the moving drum. It is possible to shift the surface layer in the cutting width direction from the base layer and perform step-cutting during a single run of the road surface cutting machine, thereby shortening the cutting time.

[0021] Preferably, the difference in height between the lower end of the cutting bit for the base layer and the lower end of the cutting bit for the surface layer during cutting is 4 cm or more and 6 cm or less. The cutting width of the cutting bit for the surface layer on the outside in the cutting width direction of the cutting bit for the base layer is 10 cm or more and 20 cm or less.

[0022] According to such a configuration, the difference in height between the lower end of the cutting bit for the base layer and the lower end of the cutting bit for the surface layer is 4 cm or more and 6 cm or less, and the cutting width of the cutting bit for the surface layer on the outside in the cutting width direction of the cutting bit for the base layer is 10 cm or more and 20 cm or less. Therefore, during a single run of the road surface cutting machine, a surface layer with a thickness of about 5 cm can be cut while being shifted about 15 cm in the cutting width direction. After performing cutting of the asphalt pavement according to the actual situation, the cutting time can be shortened.

Effect of the Invention

[0023] A road surface cutting machine for cutting an asphalt pavement where a surface layer is laid on top of a base layer with a road surface cutting device, which can shift the surface layer in the cutting width direction from the base layer and then cut it, and can shorten the cutting time, can be provided.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0025] Embodiments of the present invention will be described below based on the accompanying drawings. The drawings are intended to conceptually (schematically) show the road surface cutting machine.

Examples

[0026] As shown in FIGS. 1 and 2, the road surface cutting machine 10 includes a road surface cutting device 20, and cuts the road surface of the asphalt pavement 60 in which the surface layer 61 is overlaid on the base layer 62 by this road surface cutting device 20.

[0027] The road surface cutting machine 10 includes a vehicle body 11 for traveling, a driver's seat 12 provided at the center of the vehicle body 11 for the operator to drive and perform various operations, a crawler 13 for traveling provided on the vehicle body 11, a road surface cutting device 20 provided at the center lower part in the front-rear direction of the vehicle body 11 for cutting the road surface of the asphalt pavement 60, a first belt conveyor 14 provided in front of the road surface cutting device 20 for conveying the cutting waste forward, a second belt conveyor 15 for conveying the cutting waste from the first belt conveyor 14 to the loading platform of the truck 50, and a cover 23 for preventing the cutting waste cut by the road surface cutting device 20 from scattering.

[0028] Next, the road surface cutting device 20 will be described. The road surface cutting device 20 includes a cylindrical drum 21 with a rotation axis 24 arranged parallel to the road surface during cutting, and cutting bits 22 provided protruding from the outer peripheral surface of the drum 21 for cutting the road surface. The cutting bits 22 include base layer cutting bits 32 for cutting the base layer 62 and the surface layer 61, and surface layer cutting bits 42 for cutting only the surface layer 61 on the outer side in the cutting width direction of the base layer cutting bits 32.

[0029] The drum 21 consists of a large-diameter drum 31 with a large diameter that has base layer cutting bits 32 for cutting the surface layer 61 and the base layer 62, and a small-diameter drum 41 with a smaller diameter than the large-diameter drum 31 that is coaxially provided adjacent to the large-diameter drum 31 and has surface layer cutting bits 42 for cutting the surface layer 61.

[0030] The diameter of the large-diameter drum 31 is φ1, and the width in the cutting width direction is L1. The outer diameter in the state where the base layer cutting bits 32 are provided on the large-diameter drum 31 is D1. The diameter of the small-diameter drum 41 is φ2, and the width in the cutting width direction is L2. The outer diameter in the state where the surface layer cutting bits 42 are provided on the small-diameter drum 41 is D2.

[0031] During cutting, the difference in height between the lower end of the cutting bit 32 for the base layer and the lower end of the cutting bit 42 for the surface layer is 4 cm or more and 6 cm or less. Also, the cutting width of the cutting bit 42 for the surface layer on the outer side in the cutting width direction of the cutting bit 32 for the base layer is 10 cm or more and 20 cm or less.

[0032] Note that each dimension is preferably set as follows. The diameter φ2 of the small-diameter drum 41 is about 10 cm smaller than the diameter φ1 of the large-diameter drum 31. The outer diameter D1 with the cutting bit 32 for the base layer provided on the large-diameter drum 31 is about 100 cm, and the outer diameter D2 with the cutting bit 42 for the surface layer provided on the small-diameter drum 41 is about 90 cm. The width L2 in the cutting width direction of the small-diameter drum 41 is about 15 cm.

[0033] During cutting, as shown in FIG. 3(C), the road surface cutting device 20 of the road surface cutting machine 10 rotates as indicated by the arrow (1), and cuts the surface layer 61 and the base layer 62 upward in the advancing direction with the cutting bit 32 for the base layer, and cuts the surface layer 61 upward in the advancing direction with the cutting bit 42 for the surface layer.

[0034] Next, the road surface cutting machine 10 according to Example 2 will be described. As shown in FIG. 4, in the road surface cutting device 20 of the road surface cutting machine 10, the cutting bit 32a for the base layer and the cutting bit 42a for the surface layer are provided on the outer peripheral surface of a drum 21 having the same diameter φ1. The protruding length H1 of the cutting bit 32a for the base layer from the drum 21 is set to be larger than the protruding length H2 of the cutting bit 42a for the surface layer from the drum 21.

[0035] The difference between the protruding length H1 of the cutting bit 32a for the base layer from the drum 21 and the protruding length H2 of the cutting bit 42a for the surface layer from the drum 21 is about 5 cm. Also, the width in the cutting direction of the short cutting bit 42a for the surface layer is about 15 cm.

[0036] In this way, by using the cutting bits 22 (32a, 42a) with different lengths while sharing the drum 21, the surface layer 61 and the base layer 62 can be step-cut in one pass of the road surface cutting machine 10, thereby shortening the cutting time. Furthermore, by making the drum 21 have a simple shape with a uniform diameter, the processing cost of the drum 21 can also be reduced.

[0037] Next, the road surface cutting machine 10 according to Example 3 will be described. As shown in FIG. 5, in the road surface cutting device 20 of the road surface cutting machine 10, the drum 21 includes a large-diameter main drum 33 having cutting bits 32 for the base layer, and a sub-drum 43 provided separately from the main drum 33 on the outer side in the cutting width direction of the main drum 33 with a different axis and having cutting bits 42 for the surface layer. The sub-drum 43 can be position-adjusted and rotated by a rotation mechanism 43a.

[0038] The lower end of the cutting bit 42 for the surface layer of the sub-drum 43 is set 5 cm higher than the lower end of the cutting bit 32 for the base layer of the main drum 33. Thereby, in one pass of the road surface cutting machine 10, the surface layer 61 can be shifted in the cutting width direction from the base layer 62 and step-cut, thereby shortening the cutting time.

[0039] Next, the road surface cutting machine 10 according to Example 4 will be described. As shown in FIG. 6, in the road surface cutting device 20 of the road surface cutting machine 10, the drum 21 includes a fixed drum 34 with a fixed cutting width direction having cutting bits 32 for the base layer, and a moving drum 44 provided separately from the fixed drum 34 with a different axis and axially movable to the outer side in the cutting width direction of the fixed drum 34 and having cutting bits 42 for the surface layer. Further, a moving mechanism 45 for moving the moving drum 44 in the drum width direction as shown by the arrow (3) is provided.

[0040] The lower end of the cutting bit 42 for the surface layer of the moving drum 44 is set 5 cm higher than the lower end of the cutting bit 32 for the base layer of the fixed drum 34. Thereby, in one run of the road surface cutting machine 10, the surface layer 61 can be shifted in the cutting width direction from the base layer 62 and cut in steps, shortening the cutting time. Furthermore, by the moving mechanism 45, the moving drum 45 can be moved to both the left and right, and the road surface can be cut in steps on both sides of the vehicle. Furthermore, by the moving mechanism 45, the cutting width of the moving drum 45 can also be freely adjusted.

[0041] Next, the operation of road surface cutting using the road surface cutting machine of the comparative example will be described. Figures 7(A) to 7(E) are diagrams showing the operation of road surface cutting by the road surface cutting machine according to the comparative example. In Figure 7(A), the old surface layer 61 has a thickness of 5 cm and the old base layer 62 has a thickness of 5 cm. In Figure 7(B), the road surface cutting machine of the comparative example is run to cut the old surface layer 61 and the base layer 62 to the same position in the cutting width direction. In Figure 7(C), the road surface cutting machine is run again at almost the same location, and the old surface layer 61 is further cut by 15 cm in the cutting width direction. Thus, the stepped cutting of the old asphalt pavement 60 is completed.

[0042] In the comparative example, in Figure 7(D), the new base layer 62a is paved so that the upper surface coincides with the old base layer 62. Further, in Figure 7(E), the new surface layer 61a is paved on the new base layer 62a and the old base layer 62 remaining only 15 cm in width so that the upper surface coincides with the old surface layer 61. Thus, the repair work is completed. However, when performing stepped cutting of the old asphalt pavement 60, it is necessary to run the road surface cutting machine twice at the same location, which increases the cutting time. Moreover, since the fuel of the road surface cutting machine, which is a construction machine (heavy machine), is also used for two runs, the environmental load also takes twice as much.

[0043] Next, the operation of road surface cutting using the road surface cutting machine 10 of the embodiment will be described. Figs. 7(F) to 7(I) are working diagrams of the road surface cutting by the road surface cutting machine 10 according to the embodiment. In Fig. 7(F), the old surface layer 61 has a thickness of 5 cm and the old base layer 62 has a thickness of 5 cm. In Fig. 7(G), the road surface cutting machine 10 of the embodiment is run once, and the old base layer 62 and the surface layer 61 are cut so that the cutting width of the old surface layer 61 is 15 cm longer than the cutting width of the old base layer 62. Thus, the stepped cutting of the old asphalt pavement 60 is completed.

[0044] In the embodiment, in Fig. 7(H), the new base layer 62a is paved so that its upper surface coincides with that of the old base layer 62. Further, in Fig. 7(I), the new surface layer 61a is paved on the new base layer 62a and the old base layer 62 with a 15 cm width left, so that its upper surface coincides with that of the old surface layer 61. Thus, the repair work is completed. In this way, when performing the stepped cutting of the old asphalt pavement 60, the stepped cutting can be completed only by running the road surface cutting machine once, so the cutting time can be shortened, the fuel of the road surface cutting machine 10 which is a construction machine (heavy machine) is also sufficient for one run, and the environmental load can be reduced.

[0045] Next, the effects of the road surface cutting machine 10 of the embodiment described above will be described. In the embodiment of the present invention, in the road surface cutting device 20 of the road surface cutting machine 10, the cutting bits 22 provided to protrude from the outer peripheral surface of the drum 21 include the base layer cutting bits 32 for cutting the base layer 62 and the surface layer 61, and the surface layer cutting bits 42 for cutting only the surface layer 61 on the outer side in the cutting width direction of the base layer cutting bits 32. Therefore, when the road surface cutting machine 10 runs once, the base layer 62 and the surface layer 61 are cut by the base layer cutting bits 32, and only the surface layer 61 is cut by the surface layer cutting bits 42 on the outer side in the cutting width direction of the base layer cutting bits 32. In this way, in one run of the road surface cutting machine 10, a cutting portion of only the surface layer 61 is formed adjacent to the cutting portions of the base layer 62 and the surface layer 61. Therefore, the surface layer 61 can be shifted in the cutting width direction from the base layer 62 and stepped cutting can be performed, and the cutting time can be shortened. Further, when performing the stepped cutting of the old asphalt pavement 60, the stepped cutting can be completed only by running the road surface cutting machine 10 once, so the fuel of the road surface cutting machine 10 which is a construction machine (heavy machine) is also sufficient for one run, and the environmental load can be reduced.

[0046] Furthermore, since the drum 21 is composed of a large-diameter drum 31 with a large diameter and a small-diameter drum 41 that is coaxially adjacent to the large-diameter drum 31 and has a smaller diameter than the large-diameter drum 31, the base layer cutting bits 32 of the large-diameter drum 31 and the surface layer cutting bits 42 of the small-diameter drum 41 can step-cut the surface layer 61 and the base layer 62 during a single run of the road surface cutting machine 10, thereby shortening the cutting time.

[0047] Furthermore, since the base layer cutting bits 32a with different protruding lengths and the surface layer cutting bits 42a are provided adjacent to each other on the outer peripheral surface of the same drum 21, the base layer can be cut deeply with the base layer cutting bits 32a and only the surface layer 61 can be cut shallowly with the surface layer cutting bits 42a. The surface layer 61 and the base layer 62 can be step-cut during a single run of the road surface cutting machine 10, thereby shortening the cutting time.

[0048] Furthermore, since the drum 21 is composed of a main drum 33 with a large diameter having the base layer cutting bits 32 and a sub-drum 43 provided separately from the main drum 33 on the outer side in the cutting width direction of the main drum 33 and having the surface layer cutting bits 42 on a different axis, the base layer 62 can be cut deeply with the base layer cutting bits 32 of the main drum 33 and only the surface layer 61 can be cut shallowly with the surface layer cutting bits 42 of the sub-drum 43. The surface layer 61 can be shifted in the cutting width direction from the base layer 62 and step-cut during a single run of the road surface cutting machine 10, thereby shortening the cutting time.

[0049] Furthermore, the drum 21 includes a fixed drum 34 having cutting bits 32 for the base layer and a moving drum 44 provided separately on a different axis from the fixed drum 34 and axially movable to the outside in the cutting width direction of the fixed drum 34 and having cutting bits 42 for the surface layer. Since it is provided with a moving mechanism 45 for moving the moving drum 44 in the drum width direction, by moving the moving drum 44 to the outside in the cutting width direction of the fixed drum 34 with the moving mechanism 45, the base layer 62 can be deeply cut with the cutting bits 32 for the base layer of the fixed drum 34, and only the surface layer 61 can be shallowly cut with the cutting bits 42 for the surface layer of the moving drum 44. In one pass of the road surface cutting machine 10, the surface layer 61 can be shifted in the cutting width direction relative to the base layer 62 and cut in steps, thereby shortening the cutting time.

[0050] Furthermore, the difference in height between the lower ends of the cutting bits 32 for the base layer and the lower ends of the cutting bits 42 for the surface layer is 4 cm or more and 6 cm or less, and the cutting width of the cutting bits 42 for the surface layer on the outside in the cutting width direction of the cutting bits 32 for the base layer is 10 cm or more and 20 cm or less. Therefore, in one pass of the road surface cutting machine, the surface layer 61 with a thickness of about 5 cm can be shifted by about 15 cm in the cutting width direction and cut. Thus, after cutting the asphalt pavement 60 according to the actual situation, the cutting time can be shortened.

[0051] In the embodiment, the road surface cutting machine 10 is of a type equipped with crawlers 13, but it is not limited thereto, and the road surface cutting machine 10 may be of a wheel type equipped with tires. Also, for the sake of convenience, the cutting bit 22 is shaped like a substantially triangular pyramid tilted, but it is not limited thereto. Any general cutting bit 22 may be used regardless of its shape, material, attachment and detachment method, etc.

[0052] Also, in the embodiment, in each dimension, the diameter φ2 of the small-diameter drum 41 is set to be approximately 10 cm smaller than the diameter φ1 of the large-diameter drum 31. The outer diameter D1 with the cutting bits 32 for the base layer provided on the large-diameter drum 31 is set to be approximately 100 cm, the outer diameter D2 with the cutting bits 42 for the surface layer provided on the small-diameter drum 41 is set to be approximately 90 cm, and the width L2 in the cutting width direction of the small-diameter drum 41 is set to be approximately 15 cm. However, these values are only examples, and each dimension may be appropriately changed according to the road surface conditions of the asphalt pavement 60 and the conditions at the construction site.

[0053] That is, as long as the functions and effects of the present invention are achieved, the present invention is not limited to the embodiments.

Industrial Applicability

[0054] The technology of the present invention is suitable for a road surface cutting machine that cuts the surface and discharges the cutting material in repair work of an asphalt-paved road surface and the like.

Explanation of Signs

[0055] 10… Road surface cutting machine (road surface cutting locomotive) 20… Road surface cutting device 21… Drum 22… Cutting bit 31… Large-diameter drum 32… Cutting bit for base layer 32a… Cutting bit for base layer 33… Main drum 34… Fixed drum 41… Small-diameter drum 42… Cutting bit for surface layer 42a… Cutting bit for surface layer 43 … Sub-drum 43a… Rotating mechanism 44… Moving drum 45… Moving mechanism 50… Truck 60… Asphalt paving 61… Surface layer 61a… New surface layer 62… Base layer 62a… New base layer 63… Upper roadbed

Claims

1. A road surface cutting machine for cutting an asphalt pavement surface with a surface layer stacked on a base layer using a road surface cutting device, wherein the road surface cutting device includes a cylindrical drum having a rotation axis arranged parallel to the road surface during cutting, and cutting bits provided protruding from an outer peripheral surface of the drum for cutting the road surface, the cutting bits include cutting bits for the base layer for cutting the base layer and the surface layer, and cutting bits for the surface layer for cutting only the surface layer outside the cutting width direction of the cutting bits for the base layer, and is characterized in that it is a road surface cutting machine.

2. The road surface cutting machine according to Claim 1, wherein the drum includes a large-diameter drum having a large diameter with the cutting bits for the base layer, and a small-diameter drum coaxially provided adjacent to the large-diameter drum and having a smaller diameter than the large-diameter drum with the cutting bits for the surface layer for cutting the surface layer, and is characterized in that it is a road surface cutting machine.

3. The road surface cutting machine according to Claim 1, wherein the cutting bits for the base layer and the cutting bits for the surface layer are provided on an outer peripheral surface of the same drum, and a protruding length of the cutting bits for the base layer from the drum is set to be larger than a protruding length of the cutting bits for the surface layer from the drum, and is characterized in that it is a road surface cutting machine.

4. The road surface cutting machine according to Claim 1, wherein the drum includes a main drum having a large diameter with the cutting bits for the base layer, and a sub-drum provided separately from the main drum on a different axis outside the cutting width direction of the main drum and having the cutting bits for the surface layer, and is characterized in that it is a road surface cutting machine.

5. The road surface cutting machine according to Claim 1 or Claim 2, wherein the drum includes a fixed drum having a fixed cutting width direction with the cutting bits for the base layer, and a moving drum provided separately from the fixed drum on a different axis and axially movable to the outside of the cutting width direction of the fixed drum and having the cutting bits for the surface layer, and is characterized in that it includes a moving mechanism for moving the moving drum in the drum width direction.

6. The road surface cutting machine according to Claim 1, wherein a difference in height between a lower end of the cutting bits for the base layer and a lower end of the cutting bits for the surface layer during cutting is 4 cm or more and 6 cm or less, and a cutting width of the cutting bits for the surface layer outside the cutting width direction of the cutting bits for the base layer is 10 cm or more and 20 cm or less, and is characterized in that it is a road surface cutting machine.

Images