JPH0830324B2 - Inclined surface rolling device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an inclined surface compaction device for compacting asphalt during asphalt pavement of an inclined surface.

[Prior Art] For example, an inclined surface of a dike, a waterway, a test course of an automobile, etc. is usually paved in a longitudinal direction orthogonal to the inclined surface.
At this time, the compaction device, for example, the tire roller, must run while leaning to the left and right. For this reason, the vehicle is supported by a winch wire rope that is mounted on an anchor vehicle that is placed above the slope. At this time, if the tension of the wire rope is not properly adjusted, the roller is inclined, so the rolling load becomes uneven over the rolling width of the roller, uniform compaction is not possible, and the quality of the pavement surface is poor. descend. Further, since two operators, a roller and an anchor car, work in cooperation with each other, workability is poor, and there is a risk of erroneous operation and incomplete signaling.

[Object of the Invention] Accordingly, an object of the present invention is to provide an inclined surface compacting device having high workability and safety, which improves the quality of a pavement surface without using an anchor wheel.

According to the present invention, according to the present invention, an arm pivotally attached to one side of the main body and laterally protruding to the other side, a support wheel provided at an end portion of the arm, the arm and the other side of the main body A hydraulic cylinder interposed between the hydraulic cylinder and hydraulic control means for controlling the hydraulic pressure to the hydraulic cylinder in accordance with the gradient so as to equalize the rolling load.

[Advantageous effects of the invention] Therefore, the hydraulic pressure to the hydraulic cylinder is controlled according to the gradient,
The rolling load is made uniform over the rolling width to perform uniform compaction, and as a result, the pavement quality can be improved. In addition, the supporting wheels prevent the vehicle from tipping over to the side, eliminating the need for an anchor wheel, and as a result, workability and safety can be improved.

[Preferable Embodiments] In carrying out the present invention, the hydraulic control means includes an inclinometer for detecting the inclination or a pressure sensor for detecting the ground pressure of the rolling wheels, and a hydraulic pressure to the hydraulic cylinder based on signals from these. It is preferable that the hydraulic control servo device is configured by, for example, a command signal converter, a servo amplifier, a proportional solenoid valve, and a feedback hydraulic sensor.

In practicing the present invention, it is preferable that the overhanging distance of the arm is set so that the supporting wheel extends outside the rolling surface. This makes it possible to prevent the unrolled pavement surface from being disturbed by the support wheels.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are a plan view and a front view showing a tire roller embodying the present invention.

In the drawings, reference numeral 1 designates a tractor of a tire roller provided with a tire 2 according to a known technique, which is fixed to one side of the tractor 1 (right side in FIGS. 1 and 2). A bifurcated arm 3 is pivotally attached to the support 4 via pins 5 and 5. The arm 3 is projected to the left side in the figure with respect to the main body 1, and the protruding end portion has a second
In the state shown in the drawing, a support tire 7 that supports the tractor 1 so as to be substantially horizontal is rotatably provided. A hydraulic cylinder 6 is interposed between a bracket 3a provided above the center line of the arm 3 and a bracket 1a vertically provided on the left side of the tractor 1 in the drawing.

Further, in the tractor 1, an inclinometer 8 and a hydraulic control servo device 9 which are hydraulic control means for controlling the hydraulic pressure to the hydraulic cylinder 6 in proportion to the gradient and controlling the rolling load to be even.
Are provided.

In FIG. 3, the hydraulic control servo device 9 includes a command signal converter 10, a servo amplifier 11, a proportional solenoid valve 12 and a hydraulic sensor 13, and outputs a signal from the inclinometer 8 to the command signal converter.
The signal is converted into a command signal at 10 and output to the servo amplifier 11. The servo amplifier 11 controls the proportional solenoid valve 12 based on the command signal to control the hydraulic pressure to the hydraulic cylinder 6, and the hydraulic sensor 13
Detects the hydraulic pressure and feeds it back to the servo amplifier 11. However, the hydraulic control means is not limited to this, and a pressure sensor for detecting the ground contact pressure of each tire 2 and the hydraulic control servo device 9 are provided.
You may comprise with.

 Next, the operation will be described mainly with reference to FIG.

When the roller travels on the inclined surface having the inclination of θ during the rolling pressure, the overturning component force F expressed by the following equation parallel to the inclination acts on the center of gravity G of the roller.

F = Wsinθ Here, W ... Weight of roller Therefore, if the voltage loads at the ground contact points a and b of the tire 2 at both ends of the roller are Pa and Pb, respectively, Pa> Pb and uniform compaction cannot be performed.

Therefore, in the present invention, the overturning moment M M = F × h (1) (where h is the distance between the center of gravity G and the intersection point C) acting on the intersection point C between the center line of the roller and the inclined surface. Moment equal to M ′ M ′ = F ′ × d (2) (where F ′ ... Extension force of hydraulic cylinder 6, d ...
The component force F is canceled out by making the distance between the axis of the hydraulic cylinder 6 and the center of gravity G) act so that the rolling load of the roller is equalized over the whole range. Therefore, the hydraulic pressure to the hydraulic servo cylinder 6 is controlled by the hydraulic servo device 9 so that F ′ = F × h / d = Wsin θ × h / d from the equations (1) and (2). The extension force F ′ of the hydraulic cylinder 6 is R = F ′ × l1 / (l1 + l2) (where l1 ... It is supported by the support tire 7 in a relationship of the distance from the axis of the cylinder, l2 ... Distance between the axis of the hydraulic cylinder 6 and the center rotation surface of the support tire 7.

At this time, for example, when the slope θ changes sequentially as in the automobile test course shown in FIG. 5, the hydraulic control servo device 9 controls the hydraulic pressure based on the signal of the slope θ detected by the inclinometer 8. Automatically adjust sequentially to equalize the compaction load. Further, the inclined portion A is a portion which is currently rolling, and when the roller rolls the uppermost stage of the pavement, the tire 7 is located outside the rolling surface A when the roller is rolling the uppermost stage of the pavement. If it is allowed to come out, the supporting tire 7 does not disturb the unpaved pavement surface. Further, even if the width of the roof B is narrow and the anchor vehicle cannot run, the compaction can be performed, and even if there is an obstacle such as the guardrail C, it can be compacted to a portion very close to the obstacle.

[Summary] As described above, according to the present invention, the hydraulic pressure to the hydraulic cylinder is controlled in accordance with the gradient, and the compaction load is evened over the compaction width to perform uniform compaction. , Pavement quality can be improved. In addition, the supporting tire prevents the vehicle from falling to the side and does not require an anchor wheel. As a result, workability and safety can be improved, and rolling can be performed to a portion very close to an obstacle such as a guardrail.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a front view, FIG. 3 is a block diagram of hydraulic control means, and FIG. , FIG. 5 is a drawing similar to FIG. 4 for explaining compaction of an automobile test course. 1 ... tractor, 3 ... arm, 6 ... hydraulic cylinder,
7 ... Support tire, 8 ... Inclinometer, 9 ... Hydraulic control servo device

Claims (1)

[Claims] 1. An arm pivotally attached to one side of a main body and protruding laterally to the other side, a support wheel provided at an end of the arm, and an arm interposed between the arm and the other side of the main body. Hydraulic cylinder,
An inclined surface compaction device comprising: a hydraulic pressure control means for controlling the hydraulic pressure to the hydraulic cylinder according to the gradient to equalize the compaction load.