Slope construction system and slope construction method

Abstract

To provide a slope construction system and a slope construction method that can ensure the safety of a work machine even if the wire rope breaks that connects the work machine working on the slope to a support carriage.SOLUTION: A slope construction system has a road surface cutting device 100 that is placed on a curved slope 500 to cut it, a support carriage 600 that is placed on a flat part 510 formed on the upper part of the curved slope 500, a wire rope 700 that connects a boom 610 of the support carriage 600 to the road surface cutting device 100 above the slope of the road surface cutting device 100, and an extendable traction rope 800 that connects the boom 610 of the support carriage 600 to the road surface cutting device 100 above the slope of the road surface cutting device 100. In the slope construction system, when the wire rope 700 breaks for some reason, the safety of the road surface cutting device 100 is ensured by supporting the road surface cutting device 100 with the traction rope 800.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a slope construction system and a slope construction method for constructing a slope.

Background Art

[0002] When constructing a slope such as an automobile test course, as described in Japanese Patent Application Laid-Open No. 11-148107 (Patent Document 1), a working machine is arranged on the slope, and a support carriage (roller supporter) is arranged on a flat portion formed at the upper part of the slope. The working machine and the support carriage are connected by a wire rope to ensure the safety of the work while suppressing the working machine from slipping down.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the safety ensuring technique described in Patent Document 1, since the working machine arranged on the slope and the support carriage are connected by a single wire rope, if the wire rope breaks for some reason, the working machine may slip downward along the slope and the safety may not be ensured. At present, although it has been avoided to break by setting a high safety factor for the wire rope, it is necessary to surely prevent such a situation from occurring.

[0005] Therefore, an object of the present invention is to provide a slope construction system and a slope construction method capable of ensuring the safety of a working machine even if a wire rope connecting the working machine for constructing a slope and a support carriage breaks.

Means for Solving the Problems

[0006] The slope construction system includes a working machine arranged on a slope to construct the slope, a support trolley arranged on a flat portion formed at the upper or lower part of the slope, a wire rope connecting the boom of the support trolley and the working machine above the slope of the working machine, and an extendable auxiliary rope connecting the boom of the support trolley and the working machine above the slope of the working machine.

[0007] In the slope construction method, using the above slope construction system, while the working machine installed on the slope and the support trolley arranged on the flat portion formed at the upper or lower part of the slope are traveling in the extending direction of the slope, the road surface is constructed by the working machine.

Effect of the Invention

[0008] According to the present invention, regarding the slope construction system and the slope construction method, even if the wire rope connecting the working machine for constructing the slope and the support trolley breaks, the safety of the working machine can be ensured.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0010] Hereinafter, with reference to the attached drawings, embodiments for carrying out the present invention will be described in detail. FIG. 1 and FIG. 2 show a road surface cutting device 100 which is an example of a working machine to which the present embodiment is applicable. It should be noted that the road surface cutting device 100 described below is merely an example to which the present embodiment is applicable, and it should not be construed as being limited to its configuration. Therefore, it goes without saying that those skilled in the art can arbitrarily change and modify within the technical scope of the present embodiment.

[0011] The road surface cutting device 100 includes a self-propelled vehicle 200, a cutting unit 300 mounted on the bottom surface of the vehicle body of the self-propelled vehicle 200, and a screw conveyor 400 for discharging waste materials of the road surface cut by the cutting unit 300.

[0012] The self-propelled vehicle 200 has, for example, a pair of left and right front wheels 210 and a pair of left and right rear wheels 220 driven by a diesel engine or an electric motor. The pair of left and right front wheels 210 and the pair of left and right rear wheels 220 are attached to the vehicle body 230 via a telescopic cylinder 240 that can expand and contract in the vertical direction of the vehicle body 230. Here, as the telescopic cylinder 240, for example, a hydraulic cylinder using hydraulic oil supplied from a hydraulic pump driven by a diesel engine or an electric motor as a drive source can be used (the same applies hereinafter). Therefore, by appropriately controlling the supply and discharge of hydraulic oil to the telescopic cylinder 240, the vertical positions of the front wheels 210 and the rear wheels 220 with respect to the vehicle body 230 can be changed, and the ground clearance of the self-propelled vehicle 200 can be arbitrarily changed.

[0013] Further, on the bottom surface of the vehicle body 230, specifically, on the bottom surface located between the pair of left and right front wheels 210 and the pair of left and right rear wheels 220, a pair of guide rails 250 extending parallel to the vehicle width direction are attached. Between the pair of guide rails 250, as a member for suspending and supporting the cutting unit 300, for example, a base member 260 having a substantially rectangular parallelepiped shape with an open bottom surface is slidably attached. And the base member 260 slides in the vehicle width direction along the guide rail 250 by, for example, a telescopic cylinder (not shown) that can expand and contract in the vehicle width direction. Note that the base member 260 is not limited to the substantially rectangular parallelepiped shape with an open bottom surface, and can be, for example, any shape such as a substantially rectangular shape in plan view that can ensure the required strength.

[0014] On the bottom surface of the base member 260, as shown in FIGS. 2 and 3, a pair of support members 270 having a substantially trapezoidal shape whose width gradually decreases toward the tip are attached at a predetermined interval so that the plate surface is located on a plane perpendicular to the front-rear direction of the vehicle body 230. Here, the support member 270 is located substantially at the center in the vehicle width direction of the base member 260 and can also be integrated with the base member 260.

[0015] The cutting unit 300 has a cutting drum 320 whose rotation axis extends in the vehicle width direction of the vehicle body 230. The cutting drum 320 has a two-part shape in which both ends are relatively displaceable in the vertical direction with respect to the central portion in the axial direction, and the split portions of the cutting drum 320 have an uneven shape that can be fitted to each other at a predetermined interval. Here, the predetermined interval can be set to an interval at which the two-part cutting drums 320 do not interfere with each other even when both ends are displaced maximally in the vertical direction (hereinafter referred to as the "maximum displacement state") with respect to the central portion in the axial direction. Also, the uneven shape of the cutting drum 320 is determined such that the tips of the cutting bits of each of the two-part cutting drums 320 do not separate in the maximum displacement state, and the dimension (length) in the axial direction thereof is determined. Therefore, in the maximum displacement state, the cutting bits of one cutting drum 320 and the cutting bits of the other cutting drum 320 overlap in a predetermined range in the axial direction including the split portion for the two-part cutting drums 320.

[0016] Next, the details of the cutting unit 300 will be further described. The cutting drum 320 has a pair of split drums 340 arranged in series along the vehicle width direction of the vehicle body 230, and a joint 360 that connects the opposing ends of the pair of split drums 340.

[0017] One of the split drums 340 has a cutter drum 342 having a substantially cylindrical shape, and a plurality of cutter bits 344 detachably attached to the outer peripheral surface of the cutter drum 342. In the pair of split drums 340, the opposing ends of each cutter drum 342 are formed in an uneven shape 342A that can be fitted to each other with a predetermined interval. In the illustrated example, the end of the cutter drum 342 is formed in a rectangular wave (square wave) shape having two cycles, that is, a shape having two convex portions and two concave portions. And the convex portions and concave portions of one cutter drum 342 are fitted to the concave portions and convex portions of the other cutter drum 342 with a predetermined interval. Note that the uneven shape 342A of the cutter drum 342 is not limited to the rectangular wave shape as illustrated, and can be a well-known shape such as a triangular wave shape, a sawtooth wave shape, or a sine wave shape. Also, the uneven shape 342A of the cutter drum 342 is not limited to two cycles, and can be three cycles or more. Here, the "rectangular wave", "triangular wave", "sawtooth wave", and "sine wave" are not limited to the exact waveforms, and it is sufficient that they can be recognized as the respective waveforms visually.

[0018] The joint 360 is composed of two universal joints connected in series so as to synchronize the rotation of the pair of split drums 340 and to tilt the pair of split drums 340 at least in a V shape. Therefore, the pair of split drums 340 can be tilted in a V shape around the rotation axis extending in the front-rear direction of the vehicle body 230 with the two connecting portions of the universal joints in the joint 360 as the rotation centers. Here, by shortening the length of the member located at the center of the universal joint, the rotation centers of the respective split drums 340 can be brought closer.

[0019] Both end portions located outside the vehicle width of the pair of split drums 340 are attached to a pair of left and right brackets 370 fixed to the support member 270. Here, the pair of left and right brackets 370 are swingable about two rotary shafts 380 extending in the longitudinal direction of the vehicle body 230.

[0020] That is, the pair of left and right brackets 370 have a substantially rectangular parallelepiped shape with an open lower surface and a side surface located inside the vehicle width. In order to be tiltable in a V shape in a side view, the upper part of the end portion located inside the vehicle width widens outward in the vehicle width direction as it goes upward, forming an inclined portion. The lower parts of the end portions of the pair of left and right brackets 370 located inside the vehicle width are attached to the tip end portion (lower end portion) of the support member 270 so as to be swingable about two rotary shafts 380 extending in the longitudinal direction of the vehicle body 230, respectively. Therefore, the pair of left and right brackets 370 can tilt in a V shape about the two rotary shafts 380. Here, the "V shape" is not limited to a perfect V shape, and it is sufficient that it can be recognized as a V shape visually (the same applies hereinafter).

[0021] Also, a motor MTR such as a hydraulic motor or an electric motor that rotationally drives while supporting both end portions of the pair of split drums 340 is fixed to a portion of the pair of left and right brackets 370 located outside the vehicle width. Therefore, each split drum 340 is supported in a cantilever state on the bracket 370 via the motor MTR.

[0022] Here, it is desirable that the two rotary shafts 380 be concentric with the two connecting portions of the universal joint in the joint 360. In this way, since the split drum 340 and the bracket 370 swing integrally, the pair of split drums 340 can be tilted smoothly.

[0023] On the outer surfaces of the left and right pair of brackets 370, which are located outside the vehicle width, the tip portions of a pair of telescopic cylinders 390 are rotatably fixed about a rotation axis extending in the longitudinal direction of the vehicle body 230. The middle portions of the pair of telescopic cylinders 390 are swingably fixed to the base member 260. Therefore, when the telescopic cylinders 390 are contracted, as shown in FIG. 4, the pair of brackets 370 tilt in a V shape, and the pair of split drums 340 fixed in a cantilever state here also tilt in a V shape.

[0024] When the pair of split drums 340 have a simple cylindrical shape, in the state where they are tilted in a V shape, at their lower surfaces, the tips of the cutter bits 344 of each cutter drum 342 are separated, resulting in a portion where the road surface cannot be cut. However, since the uneven shapes 342A of each cutter drum 342 are fitted at predetermined intervals and the cutter bits 344 are attached thereto, at the central portion in the axial direction of the pair of split drums 340, the cuttable ranges of the cutter bits 344 of one cutter drum 342 and the cuttable ranges of the cutter bits 344 of the other cutter drum 342 overlap. For this reason, even when the pair of split drums 340 are tilted in a V shape, as shown in FIG. 5, at their lower surfaces, the tips of the cutter bits 344 of each cutter drum 342 do not separate, and it is possible to avoid the occurrence of a portion where the road surface cannot be cut.

[0025] The screw conveyor 400 is driven by a motor 410 such as a hydraulic motor or an electric motor, and is arranged between the front wheels 210 of the self-propelled vehicle 200 and the cutting unit 300 so that the conveying direction extends in the vehicle width direction of the vehicle body 230. Between the cutting drum 320 of the cutting unit 300 and the screw conveyor 400, a waste material receiver 420 is attached, which receives the waste material of the road surface cut by the cutting drum 320 and sends it out to the screw conveyor 400. Therefore, the waste material cut by the cutting drum 320 is received by the waste material receiver 420 and sent out to the screw conveyor 400, and is conveyed and discharged outward of the vehicle width by the operation of the screw conveyor 400.

[0026] Here, the screw conveyor 400 may be movable vertically, for example, by a telescopic cylinder (not shown) so that its relative position with respect to the cutting drum 320 of the cutting unit 300 can be changed. Further, one end of the screw conveyor 400 may be rotatably connected to a rotating shaft extending in the longitudinal direction of the vehicle body 230, while the other end may be connected to the base member 260 via a telescopic cylinder so that the inclination angle of the screw conveyor 400 can be arbitrarily changed.

[0027] A water sprinkling device for spraying water in a mist form, for example, may be attached near the cutting drum 320 to reduce dust generated during the cutting operation of the road surface. Further, the pair of split drums 340 in the cutting drum 320 may be tilted in a V-shaped (inverted V-shaped) manner when viewed from the longitudinal direction of the self-propelled vehicle 200 by extending the telescopic cylinder 390. In this way, not only concave curved slopes but also convex curved slopes can be cut. Here, the "V-shaped" does not necessarily mean a perfect V shape, but only needs to be recognizable as a V shape visually.

[0028] Next, a procedure for a method of repairing a curved slope such as an automobile test course using such a road surface cutting device 100 will be described with reference to FIGS. 6 and 7. Here, the road surface cutting device 100 is run in the direction in which the curved slope 500 extends for each predetermined width along the direction orthogonal to the direction in which the curved slope 500 extends to cut the road surface. Note that the curved slope 500 is given as an example of a slope.

[0029] [Step 1] When starting the work of repairing the curved slope 500, as shown in FIG. 6, the road surface cutting device 100 is arranged at the lower part of the curved slope 500, and a support carriage (roller supporter) 600 is arranged on the flat part 510 formed at the upper part of the curved slope 500. Then, above the slope of the road surface cutting device 100, the road surface cutting device 100 and the boom 610 of the support carriage 600 are connected, for example, by a wire rope 700.

[0030] [Step 2] Run the road surface cutting device 100 and the support trolley 600 to move them to the position where the cutting of the road surface starts as shown in Fig. 7. At this time, since the road surface cutting device 100 is connected to the support trolley 600 via the wire rope 700, normally, even if the inclination angle of the curved slope 500 is large, the work can be carried out safely.

[0031] [Procedure 3] Extend and contract the telescopic cylinder 240 of the self-propelled vehicle 200 to move the vehicle body 230 up and down, and set the height of the cutting drum 320 of the cutting unit 300 from the road surface to a predetermined height. Then, appropriately extend and contract the telescopic cylinder 390 of the cutting unit 300, and tilt the cutting drum 320 into a V shape following the curved slope 500 as shown in Fig. 4.

[0032] [Procedure 4] While rotating the cutting drum 320 of the cutting unit 300, contract the telescopic cylinder 240 of the self-propelled vehicle 200 to move the cutting drum 320 downward. Then, cut the existing road surface to a predetermined depth. At this time, since the cutting depth of the road surface can be set by the extension and contraction of the telescopic cylinder 240, its accuracy can be improved. Also, the waste material of the road surface cut by the cutting drum 320 is bounced onto the screw conveyor 400 arranged in front of the cutting drum 320, and is discharged to the side of the self-propelled vehicle 200 by the screw conveyor 400.

[0033] [Procedure 5] Run the road surface cutting device 100 and the support trolley 600 along the direction in which the curved slope 500 extends to cut the road surface in a strip shape with a predetermined width. At this time, since the road surface cutting device 100 is connected to the support trolley 600 via the wire rope 700, it will not slip downward toward the lower part of the curved slope 500, and the road surface can be continuously cut with high precision.

[0034] [Procedure 6] When the cutting is completed up to the cutting end position of the road surface, extend the telescopic cylinder 240 of the self-propelled vehicle 200 to move the cutting drum 320 of the cutting unit 300 away from the road surface. Then, stop the rotational drive of the cutting drum 320.

[0035] [Step 7] Move the road surface cutting device 100 and the support cart 600 to the next cutting start position, and repeat Steps 3 to 6.

[0036] [Step 8] When the cutting of the road surface by the road surface cutting device 100 is completed, use a road surface sweeper (sweeper) or the like to collect and clean the waste materials remaining on the curved slope 500.

[0037] [Step 9] After spraying asphalt emulsion on the road surface after cleaning, spread the asphalt mixture evenly thereon with an asphalt finisher for the slope. At this time, the asphalt mixture is supplied to the hopper of the asphalt finisher for the slope by, for example, a stacker and a belt conveyor.

[0038] [Step 10] Compact the evenly spread asphalt mixture with an iron wheel roller for the slope, a tire roller for the slope, or the like.

[0039] In this way, when cutting the road surface of the curved slope 500, the cutting drum 320 tilts in a V shape and conforms to the shape of the curved slope 500. Therefore, the curved slope 500 can be cut in a shape that follows its cross-sectional shape, and the operation of cutting deeper than the design value becomes unnecessary. Accordingly, the leveling work for laying the asphalt mixture becomes unnecessary or less, and the extension of the construction period and the increase in cost can be suppressed. Also, when the cross-sectional shape of the road surface continuously changes from flat to a three-dimensional curve, it can be dealt with by continuously changing the posture of the cutting drum 320.

[0040] The road surface cutting device 100 may include a control device with a built-in computer, and may control the telescopic cylinder 390 of the cutting drum 320 according to the pre-input cutting depth data. In this case, the road surface cutting device 100 may, for example, measure the current position by GPS (Global Positioning System) and control the telescopic cylinder 390 according to the data associated with this current position. In this way, even when the cross-sectional shape of the cut surface of the road surface continuously changes from flat to a three-dimensional curve, the road surface cutting device 100 can easily cope with it. Note that the control device of the road surface cutting device 100 may further control the telescopic cylinder 240 that moves the front wheels 210 and the rear wheels 220 up and down according to the cutting depth data.

[0041] By the way, when cutting the curved slope 500, the road surface cutting device 100 is supported by a wire rope 700 extending from the boom 610 of the support carriage 600 that travels on the flat portion formed at the upper part of the curved slope 500. The wire rope 700 has an appropriate safety factor set in consideration of, for example, the weight of the road surface cutting device 100 and the slope of the curved slope 500. For this reason, so far, the wire rope 700 has not broken, and for example, no cases such as the road surface cutting device 100 sliding down the curved slope 500 have occurred, but for the purpose of ensuring the safety of the work, further safety measures are necessary.

[0042] Therefore, in addition to the above configuration, the slope construction system proposed in this embodiment is, as shown in FIG. 8, above the slope of the road surface cutting device 100, a bracket 620 is attached near the tip of the boom 610 of the support carriage 600, and the bracket 620 and the road surface cutting device 100 are connected by a telescopic traction rope 800. Here, since the support carriage 600 and the road surface cutting device 100 are connected by a wire rope 700, in order not to affect the supporting force of the wire rope 700 by the traction rope 800, it is desirable that the traction rope 800 connecting the support carriage 600 and the road surface cutting device 100 has a full length in which the traction function is not exerted. The fixing of the traction rope 800 to the boom 610 of the support carriage 600 may not use the bracket 620. Note that the telescopic traction rope 800 is an example of a telescopic auxiliary rope.

[0043] As shown in FIG. 9, the traction rope 800 includes a telescopic towing cable portion 810 made of fibers similar to a fire hose, a pair of rope eye portions 820 respectively fixed to both ends of the towing cable portion 810, and a telescopic rubber rope portion 830 connecting the pair of rope eye portions 820 inside the towing cable portion 810. Therefore, as shown in the same figure, the traction rope 800 is configured to be telescopic between the natural length state (the state in the upper figure) in which no external force acts on the rubber rope portion 830 and the traction state (the state in the lower figure) in which the towing cable portion 810 is fully extended and traction is possible.

[0044] One end of the towing rope 800 connected to the support trolley 600 is detachably connected to a hook (not shown) fixed to the bracket 620 of the boom 610 of the support trolley 600, for example, via a shackle (not shown). Further, the other end of the towing rope 800 connected to the road surface cutting device 100 is detachably connected to a hook (not shown) fixed to a predetermined position of the road surface cutting device 100, for example, via a shackle (not shown). Therefore, the towing rope 800 connecting the support trolley 600 and the road surface cutting device 100 can be easily replaced by releasing the shackle, and a suitable one can be used according to the distance between the support trolley 600 and the road surface cutting device 100.

[0045] Here, referring to FIG. 10, the function of ensuring the safety of the road surface cutting device 100 by the towing rope 800 when the wire rope 700 connecting the support trolley 600 and the road surface cutting device 100 breaks for some reason will be described.

[0046] When the wire rope 700 connecting the support trolley 600 and the road surface cutting device 100 breaks, the supporting function of the road surface cutting device 100 by the wire rope 700 is lost. Therefore, as shown by the white arrow in FIG. 10, the road surface cutting device 100 tends to slide downward toward the lower side of the curved slope 500. At this time, the towing rope 800 gradually extends from the natural length state to the towing state and absorbs the force that the road surface cutting device 100 tends to slide downward toward the lower side of the curved slope 500. For this reason, even if the wire rope 700 breaks, the road surface cutting device 100 does not slide down all at once, and for example, it is possible to prevent an operator operating the road surface cutting device 100 from becoming anxious. And in the state where the towing rope 800 has extended to the towing state, the road surface cutting device 100 can be safely supported by the support trolley 600 via the towing part 810.

[0047] Therefore, even if the wire rope 700 connecting the road surface cutting device 100 that cuts the curved slope 500 and the support carriage 600 breaks, the safety of the road surface cutting device 100 can be ensured by the towing rope 800. Here, the connection position of the towing rope 800 to the road surface cutting device 100 is preferably near the center of gravity of the road surface cutting device 100 when viewed from the support carriage 600 to the road surface cutting device 100. In this way, even if the road surface cutting device 100 is supported by the towing rope 800, the moment acting around the center of gravity of the road surface cutting device 100 becomes 0 or small, so the possibility of the road surface cutting device 100 tipping over can be significantly reduced.

[0048] And when constructing a slope using such a slope construction system, the road surface cutting device 100 arranged on the curved slope 500 and the support carriage 600 arranged on the flat part 510 formed on the upper part of the curved slope 500 are run in the direction in which the curved slope 500 extends, and the road surface may be cut by the road surface cutting device 100. At this time, even if the distance between the road surface cutting device 100 and the support carriage 600 changes slightly, the towing rope 800 expands and contracts accordingly, so that the towing function can prevent the supporting force of the wire rope 700 from being affected.

[0049] In the above embodiment, the road surface cutting device 100 is described as an example of a working machine. However, the working machine is not limited to the road surface cutting device 100, and may be a well-known machine such as a compaction machine such as a road roller or a tire roller, or an asphalt finisher. Further, the road surface cutting device 100 is not limited to a configuration in which the cutting drum 320 can be tilted in a V shape according to the shape of the curved slope 500, and may be a general configuration in which the cutting drum 320 does not tilt. Furthermore, the slope is not limited to the curved slope 500 with a changing inclination angle, and may be a slope with a constant inclination angle.

[0050] In addition, the support cart 600 may be arranged not only on the flat portion 510 formed on the upper part of the curved slope 500 but also on the flat portion formed on the lower part of the curved slope 500, and may be configured to support the road surface cutting device 100 by a boom 610 that extends above the curved slope 500 beyond the road surface cutting device 100. Therefore, the wire rope 700 and the towing rope 800 only need to connect the boom 610 of the support cart 600 and the road surface cutting device 100 above the slope of the road surface cutting device 100.

[0051] Those skilled in the art can easily understand that they can create new embodiments by omitting a part of the above-described technical idea, appropriately combining a part of it, or replacing a part of it with well-known techniques.

Explanation of Reference Numerals

[0052] 100… Road surface cutting device (working machine) 500… Curved slope (slope) 510… Flat portion 600… Support cart 610… Boom 700… Wire rope 800… Towing rope (extendable auxiliary rope)

Claims

1. A work machine that is placed on a slope and works on the slope; A support cart disposed on a flat portion formed on the upper or lower portion of the slope; a wire rope connecting the boom of the support carriage and the work machine above the slope of the work machine; an extendable auxiliary rope connecting the boom of the support carrier and the work machine above the slope of the work machine; A slope construction system having the above structure.

2. The auxiliary rope is connected near the center of gravity of the work machine. The slope construction system according to claim 1 .

3. The auxiliary rope is an expandable traction rope. The slope construction system according to claim 1 .

4. The auxiliary rope is connected to the boom of the support carriage and the work machine via a shackle ring, The slope construction system according to claim 1 .

5. A slope construction method using a slope construction system according to any one of claims 1 to 4, comprising: running a work machine installed on the slope and a support cart placed on a flat portion formed on the upper or lower part of the slope in the direction in which the slope extends, while the work machine constructs a road surface.

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