JPH0556816B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a compaction degree measuring device in a compaction device for compacting foundation ground such as road subgrade soil or roadbed.

<Prior Art> The degree of compaction of subgrade soil or roadbed for roads, etc. must be formed so as to satisfy a predetermined standard up to a predetermined depth. For this reason, conventionally, for example, subgrade soil is removed by a predetermined height (for example, 20 to 30 cm) and compacted using a compaction device such as a road roller. moreover,
A predetermined height of subgrade soil is removed from the compacted subgrade soil and compacted by the compaction device. In this way, the degree of compaction of the subgrade soil is formed to a predetermined depth to satisfy a predetermined standard.

<Problems to be Solved by the Invention> Conventionally, in order to measure the degree of compaction of subgrade soil or roadbed, the density is measured from a compacted subgrade soil or roadbed specimen, and the density is The degree of compaction was measured by

However, in the method in which the degree of compaction is measured by taking a specimen after compaction and measuring the density, it takes time to measure the degree of compaction and the measurement efficiency is not good.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a compaction degree measuring device for a compaction device that can efficiently measure the compaction degree of foundation ground such as subgrade soil in a short time. do.

<Means for Solving the Problems> For this reason, the present invention provides an acceleration sensor that detects the acceleration at or near the time of collision of a compaction member that repeatedly collides with the surface of the foundation ground, and a and a compaction degree determination device that determines the compaction degree of the foundation ground based on the basis of the compaction degree determination device.

<Function> In this way, the degree of compaction of the foundation ground is determined from the acceleration of the compaction member, and the foundation ground can be compacted efficiently in a short time.

<Example> An example of the present invention will be described below based on FIGS. 1 to 5.

First, the tightening device will be explained based on FIGS. 1 and 2. A steering wheel 2 and a driving wheel 3 are attached to a lower front end and a lower rear end of a vehicle frame 1, respectively. A steering mechanism (not shown) is connected to the steering wheel 2, and a drive device (not shown) is connected to the drive wheel 3. A driver's seat 4 is provided at the rear of the vehicle frame 1, and a control device 5 for controlling the steering mechanism, the drive device, and various devices described below is provided in the vehicle frame 1 in front of the driver's seat 4. Further, a hydraulic pressure supply device 6 is provided at the front of the vehicle frame 1 to supply hydraulic pressure to various devices via the control device 5.

A cutting conveyor 7 is attached to a substantially central portion of the vehicle frame 1 and extends in the longitudinal direction of the vehicle, and a guide plate 8 is provided below the cutting conveyor 7 along the conveyor 7. Then, the cutting conveyor 7 excavates the subgrade soil A as the foundation ground to a predetermined depth, and conveys and supplies it to the rear of the first compaction device 9, which will be described later, while being guided by the guide plate 8.

Furthermore, rotary type screw cutters 10a and 10b for excavating the subgrade soil A to a predetermined depth are provided on both sides of the cutting conveyor 7, respectively. These screw cutters 10a, 10b have spiral blades formed in opposite directions from the center, and collect excavated subgrade soil onto the cutting conveyor 7 in the center. Then, these subgrade soils are transported and supplied to the rear of the first compaction device 8 by the cutting conveyor 7.

A first compaction device 9 is provided below the cutting conveyor 7. This first compaction device 9
As shown in FIG. 3, there is a diaphragm 9a as a tightening member extending in the width direction of the vehicle, and a plurality of diaphragms 9a arranged at predetermined intervals on the diaphragm 9a, which are applied mainly in the vertical direction. Vibrating eccentric cam type vibrator 9b
It is composed of and. The first compacting device 9 compacts the subgrade soil excavated and exposed by the cutting conveyor 7 and the screw cutters 10a and 10b to a predetermined compaction degree.

Further, a second compaction device 11 is provided at the rear of the vehicle frame 1, and the second compaction device 11 compacts the subgrade soil B conveyed and supplied by the cutting conveyor 7 to a predetermined degree of compaction. It's summery. Second
The compaction device 11, like the first compaction device 9,
A diaphragm 11a extending in the width direction of the vehicle, and a plurality of diaphragms 1 arranged at predetermined intervals on the diaphragm 11a.
A vibrator 11b that vibrates 1a primarily in the vertical direction
It is composed of and.

A screw spreader 12 is provided between the first tightening device 9 and the second tightening device 11 so as to extend in the vehicle width direction. The screw spreader 12 has spiral blades formed in opposite directions from the center, and the blades transport the subgrade soil conveyed and supplied from the cutting conveyor 7 toward both sides, so that it is almost uniform. It is structured so that it is evenly distributed.

Further, the vibration plate 9a of the first compaction device 9 has a third
As shown in the figure, an acceleration sensor 13 is provided to detect the vertical acceleration of the diaphragm 9a, and the detection signal of this acceleration sensor 13 is transmitted to the control device 5.
has been entered. Further, a rotation speed sensor 14 is provided to detect the rotation speed of the eccentric cam of the vibrator 9b of the first compacting device 9, and a detection signal of this rotation speed sensor 14 is input to the control device 5. Also,
A speed sensor 15 is provided to detect the traveling speed of the vehicle, and a detection signal from this speed sensor 15 is input to the control device 5.

The control device 5 is provided with a first converter 16 for D/A converting the rotation speed detection signal, and the first converter 16 outputs a conversion signal to the rotation speed display meter 17 and the compaction degree determination section 18. do. Further, the control device 5 is provided with a second converter 19 that converts the acceleration detection signal into D/A, and the second converter 19 converts the acceleration detection signal into the compaction degree determination section 18, the acceleration indicator 20, and the integrator 21. Output a signal. The integrator 21 integrates the converted acceleration to determine the displacement of the diaphragm 9a in the vertical direction, and outputs this displacement signal to the displacement indicator 22. Further, the control device 5 is provided with a third converter 23 for D/A converting the traveling speed detection signal, and the third converter 23 outputs a conversion signal to the traveling speed indicator 24 and the traveling speed control section 25. do.

The degree of compaction determination section 18 determines the degree of compaction of the subgrade soil from the rotational speed of the vibrator 9b and the acceleration of the diaphragm 9a, as will be described later, and also determines the degree of compaction of the determined subgrade soil. A compaction degree signal corresponding to the above is output to the traveling speed control section 25. Further, the compaction degree determining unit 18 applies the rotation speed control signal for controlling the rotation speed of the vibrator 9b so that the determined compaction degree of the subgrade soil becomes a predetermined target compaction degree. Shaker 9
Output to b.

The traveling speed control unit 25 also controls the traveling speed so that the entire surface of the subgrade soil uniformly reaches a predetermined target degree of compaction based on the detected traveling speed and the determined degree of compaction of the subgrade soil. is set, and the set traveling speed control signal is output to the drive device that drives the drive wheels 3.

Further, the control device 5 is provided with a setting section 26 for setting a target compaction degree and running speed of the subgrade soil, and the setting section 26 sends setting signals to the compaction degree determining section 18 and the running speed control section 25, respectively. Output.

Note that 27 is a drive motor that drives the cutting conveyor 7.

Next, the action will be explained.

The cutting conveyor 7 and the screw cutters 10a, 10b are moved while the vehicle is moving forward at a predetermined speed.
The subgrade soil A is excavated to a predetermined depth, and the excavated subgrade soil is conveyed to the rear of the first compaction device 9 by the cutting conveyor 7.

Then, the vibrating plate 9a of the first compacting device 9 is struck against the excavated and exposed subgrade soil to compact the subgrade soil to a predetermined degree of compaction. Further, the subgrade soil conveyed by the cutting conveyor 7 is dropped onto the subgrade soil compacted by the first compaction device 9, and is spread almost uniformly by the screw spreader 12. The diaphragm 11a of the second compaction device 11 is placed on the leveled subgrade soil.
to compact the subgrade soil to a predetermined target compaction degree.

By the way, when the diaphragms 9a, 11a are struck against the subgrade soil, the diaphragms 9a, 11a are damaged due to the reaction of the subgrade soil.
The acceleration when raising 11a in the vertical direction depends on the degree of compaction of the subgrade soil. Specifically, as the degree of compaction of the subgrade soil increases, the acceleration increases and converges to a certain value when the degree of compaction exceeds a predetermined degree. Further, the converged acceleration corresponds to the rotation speed of the vibrators 9b, 11b, and becomes a substantially constant value when the rotation speed of the vibrators 9b, 11b exceeds a predetermined value C, as shown in FIG.

Therefore, if the rotational speed of the vibrators 9b and 11b is set above the predetermined value C, when the acceleration detected by the acceleration sensor 13 reaches the predetermined value D shown in FIG. It can be determined that the soil has been compacted to a predetermined target compaction degree.

In this way, the rotational speed of the accelerators 9a and 11b can be controlled, and the subgrade soil can be compacted to a predetermined target compaction degree.

Then, while compacting the subgrade soil to a predetermined target compaction degree, the traveling speed of the compaction device is variably controlled, and the entire surface of the subgrade soil is compacted to approximately a predetermined target compaction degree.

As explained above, since the degree of compaction of the subgrade soil is determined by detecting the acceleration of the diaphragm 9a that compacts the subgrade soil, compaction hardness measurement can be carried out quickly and efficiently. The measurement efficiency can be greatly improved.

In addition, in this embodiment, the subgrade soil exposed by excavating the subgrade soil is compacted to a predetermined target compaction degree by the first compaction device 9, and the excavated subgrade soil is compacted. The subgrade soil is transported and supplied to the subgrade soil and compacted to a predetermined target degree of compaction by the second compaction device 11, so that the subgrade soil can be delivered to a predetermined depth to a deeper place than before by simply driving the vehicle once. It is possible to compact the compaction to the target compaction degree, and the work efficiency can be greatly improved compared to the conventional method, thereby reducing construction costs.

In this embodiment, the diaphragm 9b detects the acceleration immediately after the collision with the subgrade soil, but the acceleration at the time of the collision with the subgrade soil may also be detected. In addition, the vibration exciter 9
Although the rotation speed of the compaction device b and the running speed of the compacting device are automatically controlled, when the running speed is controlled manually by the driver, the control device 5 controls the running speed and the running speed of the vibration exciters 9b and 11b. The rotation speed and acceleration are displayed and the vehicle is moved forward when the subgrade soil reaches a predetermined target compaction degree.

Further, in the case of automatic operation, a predetermined target degree of compaction can be ensured by setting the traveling speed to be substantially constant and controlling the rotational speed of the vibrator 9a so that the acceleration becomes a predetermined value. Furthermore, even if the traveling speed is changed based on the rotation speed and acceleration of the vibrator 9a, a predetermined target degree of compaction can be similarly ensured.

<Effects of the Invention> As explained above, the present invention measures the degree of compaction of the foundation ground by detecting the acceleration of the compaction member that compacts the foundation ground. Since it can be carried out quickly and efficiently, measurement efficiency can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a side view of the compaction device, Fig. 2 is a plan view of the same, Fig. 3 is a perspective view of the main parts of the above, Fig. 4 is a block diagram of the control device of the above, and Fig. 5 is the operation of the same as the above. It is a characteristic diagram for explaining. 5... Control device, 9a... Vibration plate, 13... Acceleration sensor, 14... Rotation speed sensor, 15... Speed sensor, 18... Compaction degree determination section, 25... Traveling speed control section.

Claims (1)

[Claims] 1. In a foundation ground compaction device that compacts the foundation ground by repeatedly colliding a compaction member against the surface of the foundation ground, an acceleration sensor that detects acceleration at or near the time of collision of the compaction member; A compaction degree measuring device in a foundation ground compaction device, comprising: a compaction degree determination device that determines the compaction degree of the foundation ground based on acceleration.