Ground measurement system

Abstract

To provide a ground measurement system capable of precisely obtaining a ground state as moving an RI measuring instrument.SOLUTION: A ground measurement system 1 is provided with: a vibration roller 2 (traveling device); a scattering-type RI measuring instrument 10 mounted on the vibration roller 2; a location information receiver 3 receiving location information of the RI measuring instrument 10; a control device 20 producing measurement results of a compaction degree or water ratio of the ground on the basis of radiation data measured with the RI measuring instrument 10; and a display 4 displaying the location information and the measurement result of the RI measuring instrument 10. Every time traveled distance of the RI measuring instrument 10 reaches a specific distance, the control device 20 produces the measurement results and causes the display 4 to display the measurement results.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ground measurement system. [Background technology]

[0002] When managing ground compaction in road construction or embankment construction, the degree of compaction and water content of the ground are calculated from the wet density or moisture content of the ground. One type of soil measurement system is one in which a rotating cylinder that can roll on the ground is attached to a vibrating roller and a scattering-type RI (radioisotope) measuring device is housed inside the rotating cylinder (see, for example, Patent Document 1). In this type of soil measurement system, the wet density or moisture content of the ground is measured by the RI measuring device while the vibrating roller is running. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7246039 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional ground measurement system described above, measurements using an RI measuring instrument are started and ended at appropriate positions while operating a vibrating roller, and the position information of the start and end positions is recorded. After the measurement, the measurement results are input into a computer and visualized. This configuration is prone to human error and, because the measurement results cannot be grasped in real time, there are problems in that if insufficient compaction is discovered, a significant amount of rework is required.

[0005] The present invention aims to solve the above-mentioned problems and to provide a ground measurement system that can accurately grasp the state of the ground while moving an RI measuring instrument. [Means for solving the problem]

[0006] To solve the above problems, the present invention provides a ground measurement system comprising: a traveling device capable of traveling on the ground, a scattering-type RI measuring instrument mounted on the traveling device, a position information receiver that receives position information of the RI measuring instrument, a control device that generates measurement results of the degree of compaction or water content of the ground based on radiation data measured by the RI measuring instrument, and a display device that displays the position information of the RI measuring instrument and the measurement results. The control device generates the measurement results and displays them on the display device each time the RI measuring instrument reaches a predetermined distance.

[0007] In the ground measurement system of the present invention, measurement results are displayed on the display device each time the RI measuring device moves a predetermined distance based on the position information of the RI measuring device. In this way, the ground measurement system of the present invention automatically creates measurement results for each predetermined distance, preventing measurement errors. Furthermore, in the ground measurement system of the present invention, measurement results can be displayed on the display device in real time as the RI measuring device is moved, allowing the condition of the ground to be accurately understood based on the position of the RI measuring device.

[0008] In the above-described ground measurement system, it is preferable that the traveling device is provided with a rotating cylinder capable of rolling on the ground, and the RI measuring device is housed inside the rotating cylinder. With this configuration, the RI measuring instrument can be moved while maintaining a constant distance between it and the ground, making it less likely that measurement errors will occur due to unevenness in the ground, thereby improving the accuracy of the measurement results.

[0009] In the above-described ground measurement system, it is preferable that the distance satisfies the condition of the following formula 1. L≧T×V (Formula 1) (In the formula, L is the distance, T is the measurement time at which the difference between the measurement results of a scattering-type RI measuring instrument and the measurement results of a transmission-type RI measuring instrument on a specified ground surface is approximately 10% or less, and V is the movement speed at which the difference between the measurement results of a scattering-type RI measuring instrument and the measurement results of a transmission-type RI measuring instrument on a specified ground surface is approximately 10% or less.)

[0010] In this configuration, the measurement time T and movement speed V of the scattering-type RI measuring instrument are set so that the difference in measurement results with the transmission-type RI measuring instrument is small, and the distance L required for the RI measuring instrument to measure the ground accurately is calculated from the measurement time T and movement speed V. In this way, by improving the measurement accuracy of the RI measuring instrument, the condition of the ground can be accurately grasped. Although the maximum value of the distance L is not limited, the smaller the distance L, the smaller the area indicated by a single measurement result, and therefore the more detailed the condition of the ground at the measurement target can be grasped. [Effects of the Invention]

[0011] In the ground measurement system of the present invention, measurement results are automatically and continuously displayed in real time at specified distances as the RI measuring instrument moves, allowing for an accurate understanding of the ground condition, thereby improving the accuracy and efficiency of work on the ground. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is an overall configuration diagram of a ground measurement system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front cross-sectional view showing an RI measuring device in the ground measurement system according to the embodiment of the present invention. [Figure 3] FIG. 10 is a diagram showing measurement results displayed on a display device in the ground measurement system according to the embodiment of the present invention. [Figure 4] FIG. 10 is a diagram showing a state in which a plurality of measurement results are continuously displayed on a display device in the ground measurement system according to the embodiment of the present invention. [Figure 5] 1 is a flowchart of a ground measurement method using a ground measurement system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a diagram showing the overall configuration of a ground measurement system according to an embodiment of the present invention. In this embodiment, as shown in Fig. 1, a ground measurement system 1 using a vibrating roller 2 will be described. The ground measurement system 1 measures the degree of compaction and water content of the ground while performing a ground compaction operation using the vibrating roller 2.

[0014] The ground measurement system 1 includes a vibrating roller 2, an RI measuring instrument 10 mounted on the vibrating roller 2, a position information receiver 3 that receives position information of the RI measuring instrument 10, a control device 20, and a display device 4. The vibrating roller 2 is a rolling machine that compacts the ground with two rolls 2a, 2a while traveling on the ground. The vibrating roller 2 of this embodiment is a traveling device in the claims.

[0015] FIG. 2 is a front cross-sectional view showing an RI measuring device of a ground measurement system according to an embodiment of the present invention. The RI measuring instrument 10 measures the wet density and moisture content of the ground. As shown in Fig. 2, the RI measuring instrument 10 includes a radiation generating unit 11 that irradiates the ground with gamma rays and neutron rays, and a detecting unit 12 that detects radiation that has been repeatedly scattered within the ground. The RI measuring instrument 10 also outputs the emitted and detected amounts of radiation to the control device 20 as radiation data.

[0016] 1, the RI measuring device 10 is mounted on a vibrating roller 2. That is, the RI measuring device 10 moves in conjunction with the movement of the vibrating roller 2. A rotating cylinder 2b is provided at the bottom of the vibrating roller 2. The rotating cylinder 2b is a cylindrical member with a peripheral wall formed around an axis parallel to the wheel axis of the vibrating roller 2. The rotating cylinder 2b is rotatably connected to the lower end of an arm 2c that extends downward from the bottom of the vibrating roller 2. The rotating cylinder 2b can roll on the ground. The RI counter 10 is housed inside the rotating cylinder 2b, as shown in Fig. 2. The radiation generating unit 11 and the detecting unit 12 of the RI counter 10 are housed inside the rotating cylinder 2b so that they always maintain the same posture without being linked to the rotation of the rotating cylinder 2b.

[0017] 1, the position information receiver 3 acquires the position information of the RI measuring instrument 10. The position information receiver 3 is a receiver used for position detection using the GNSS (Global Navigation Satellite System), and has an antenna for receiving satellite signals from multiple artificial satellites. The position information receiver 3 is mounted on the vibrating roller 2 together with the RI measuring instrument 10. In this embodiment, the position coordinates of the position information receiver 3 are set to the position coordinates of the RI measuring instrument 10. Note that the position coordinates of the position information receiver 3 may be corrected to the actual position coordinates of the RI measuring instrument 10.

[0018] The control device 20 is a computer configured with a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), HDD (Hard Disk Drive), I / F (Interface), etc. Each means of the control device 20 is realized by the CPU executing a predetermined control program stored in storage means such as the ROM or HDD.

[0019] The control device 20 includes a position information processing means 21, a calculation means 22, and an image processing means 23. Based on the position information and time received by the position information receiver 3, the position information processing means 21 calculates data including the position coordinates, movement distance, and movement speed of the RI measuring device 10 (hereinafter referred to as "movement data"). The position information processing means 21 creates movement data including the position coordinates of the start point, the position coordinates of a point the distance L from the start point (hereinafter referred to as the "end point"), and the movement speed from the start point to the end point, each time the RI measuring instrument 10 moves a predetermined distance L from a certain point (hereinafter referred to as the "start point"), and outputs the data to the calculation means 22. In this embodiment, the position information processing means 21 continuously creates movement data, that is, the end point of movement data is set as the start point of the next movement data.

[0020] In the position information processing means 21 of this embodiment, the distance L is set in advance to satisfy the following formula 1. L≧T×V (Formula 1) In the formula, L is the distance. T is the measurement time at which the difference between the measurement results of the scattering type RI measuring instrument and the measurement results of the transmission type RI measuring instrument on a given ground is approximately 10% or less. V is the moving speed at which the difference between the measurement results of the scattering type RI measuring instrument and the measurement results of the transmission type RI measuring instrument on a given ground is approximately 10% or less.

[0021] The transmission type RI measuring instrument measures the wet density and moisture content of the ground by burying the radiation generating unit in the ground. Such a transmission type RI measuring instrument has higher measurement accuracy than the scattering type RI measuring instrument 10. By setting the distance L to satisfy the formula 1, the measurement results of the scattering-type RI measuring instrument 10 will approximate the measurement results of the transmission-type RI measuring instrument. In other words, the distance L that satisfies the formula 1 is the distance necessary for the scattering-type RI measuring instrument 10 to measure the ground with high accuracy. In this embodiment, the measurement time T and the movement speed V are set so that the difference between the measurement results of the scattering type RI measuring instrument and the measurement results of the transmission type RI measuring instrument is approximately 10% or less, but it is more preferable to set the measurement time T and the movement speed V so that the difference between the measurement results of the scattering type RI measuring instrument and the measurement results of the transmission type RI measuring instrument is approximately 5% or less.

[0022] Furthermore, in the position information processing means 21 of this embodiment, the distance L satisfies the condition of the above-mentioned formula 1, and is set to be approximately the same size as the rolling width (horizontal width of the roll 2a) of the vibrating roller 2. Therefore, in the position information processing means 21, each time the RI measuring instrument 10 moves the distance L corresponding to the rolling width, the position information processing means 21 creates movement data (position coordinates of the start point, position coordinates of the end point, and movement speed from the start point to the end point).

[0023] The calculation means 22 calculates the wet density and water content of the ground based on the radiation data measured by the RI measuring instrument 10, and calculates the degree of compaction and water content of the ground from the wet density and water content.

[0024] The calculation means 22 generates, for each piece of movement data created by the position information processing means 21, measurement results of the degree of compaction and the water content of the ground in the area indicated by the movement data. That is, the calculation means 22 calculates the degree of compaction and water content of the ground in the area corresponding to the distance L each time the RI measuring instrument 10 moves a predetermined distance L based on the radiation data measured while the RI measuring instrument 10 moves the distance L.

[0025] The image processing means 23 creates image data that reflects the movement data of the RI measuring instrument 10 and the measurement results of the ground compaction degree and water content, and outputs the image data to the display device 4. The display device 4 is a monitor that can display the image data of the movement data and the measurement results on a screen.

[0026] Fig. 3 is a diagram showing measurement results displayed on a display device in the ground measurement system according to the embodiment of the present invention. Fig. 4 is a diagram showing a state in which a plurality of measurement results are displayed consecutively on a display device in the ground measurement system according to the embodiment of the present invention. As shown in Fig. 3, the image processing means 23 indicates movement data by a circular mark M whose diameter is the line segment (distance L) connecting the start point P1 and the end point P3. The center point of the circular mark M is the midpoint P2 between the start point P1 and the end point P3. As shown in Fig. 4, the mark M is placed at a corresponding position within a target range A that indicates the area to be measured. In this embodiment, the distance L is approximately the same as the width of the compaction by the vibrating roller 2 (see FIG. 1), so the mark M also indicates the compacted area within the target area A. Note that the mark M may be rectangular or have another shape.

[0027] Furthermore, the image processing means 23 (see FIG. 1) is configured to display either the degree of compaction of the ground or the magnitude of the water content ratio by using a color on the mark M, as shown in FIG. 3. The display of the degree of compaction or the water content ratio can be switched by the worker as appropriate. The color of the mark M is graded according to the degree of compaction or the water content ratio of the ground. The numerical value of the degree of compaction or the water content ratio of the ground may also be added to the mark M.

[0028] Next, a ground measurement method using the above-described ground measurement system 1 will be described. 5 is a flowchart of a ground measurement method using a ground measurement system according to an embodiment of the present invention. In the following description, the flowchart in FIG. 5 will be referred to as appropriate. When a measurement start signal is input to the control device 20 (step S1), the RI measuring instrument 10 starts the first (n-th) measurement (step S2).

[0029] When the RI measuring device 10 shown in FIG. 1 starts measurement, the position information processing means 21 sets the position coordinates of the RI measuring device 10 at that time as the starting point (step S3). Furthermore, the position information processing means 21 calculates the distance Ln that the RI measuring device 10 has traveled from the starting point based on the positional relationship between the starting point and the current position coordinates of the RI measuring device 10.

[0030] When the distance Ln traveled from the starting point P1 becomes equal to or greater than the predetermined distance L (YES in step S4), the position information processing means 21 sets the coordinates of the RI measuring device 10 at that time as the end point (step S5). Then, the position information processing means 21 creates movement data indicating the coordinates of the start point, the coordinates of the end point, and the distance L (step S6). Furthermore, the calculation means 22 generates measurement results of the degree of compaction and the water content of the ground in the area indicated by the movement data based on the radiation data measured by the RI measuring instrument 10 (step S7).

[0031] The image processing means 23 creates image data of the movement data and the measurement results (step S9), and causes the image data to be displayed on the display device 4 (step S9). Thereafter, the control device 20 increments the number of measurements (step S10) and starts the second (n+1=nth) measurement (step S2). Then, the ground measurement is repeated and the measurement results are displayed on the display device 4 until a signal to end the ground measurement is input to the control device 20 (YES in step S11).

[0032] In the above-described ground measurement system 1, as shown in Fig. 1, measurement results are displayed on the display device 4 every time the RI measuring instrument 10 moves a predetermined distance L (see Fig. 4). In this way, in the ground measurement system 1 of this embodiment, measurement results are automatically created every predetermined distance L, preventing measurement errors. Furthermore, the ground measurement system 1 of this embodiment can display the measurement results on the display device 4 in real time while the RI measuring instrument 10 is being moved. Furthermore, in the ground measurement system 1 of this embodiment, the distance L required for the RI measuring instrument 10 to measure the ground with high accuracy is calculated. As a result, the ground measurement system 1 can accurately grasp the state of the ground (degree of compaction and water content) while compacting the ground, thereby enabling the ground to be compacted efficiently.

[0033] Furthermore, in the ground measurement system 1 of this embodiment, as shown in Figure 2, the RI measuring instrument 10 is housed inside the rotating cylinder 2b that rolls on the ground, and the distance between the RI measuring instrument 10 and the ground can be kept constant, thereby improving the accuracy of the measurement results.

[0034] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate within the scope of the invention. In the ground measurement system 1 of this embodiment, as shown in Figure 3, movement data is represented by a circular mark M, but the display format of the movement data is not limited to this. For example, the movement data may be represented in a band by connecting rectangular marks that correspond to the compaction width.

[0035] In the ground measurement system 1 of this embodiment, the RI measuring instrument 10 is housed in the rotating cylinder 2b as shown in FIG. 2, but the RI measuring instrument 10 may also be attached directly to the bottom of the vibrating roller 2.

[0036] In the ground measurement system 1 of this embodiment, as shown in Figure 1, the RI measuring instrument 10 is mounted on the vibrating roller 2, but the running device for moving the RI measuring instrument 10 is not limited, and a running device may be provided separately from the vibrating roller 2. [Explanation of symbols]

[0037] 1. Ground measurement system 2 vibrating rollers 2a Roll 2b Rotating cylinder 2c Arm 3. Location information receiver 4 Display device 10 RI measuring instrument 11 Radiation Generation Unit 12 Detector 20 Control device 21 Location information processing means 22 Calculation means 23 Image processing means A. Scope M mark P1 Starting point P2 midpoint P3 End point

Claims

1. A running device capable of running on the ground; a scattering type RI measuring instrument mounted on the traveling device; a location information receiver for receiving location information of the RI measuring instrument; a control device that generates measurement results of the degree of compaction or the water content of the ground based on the radiation data measured by the RI measuring device; a display device that displays the position information of the RI measuring device and the measurement results, The control device A ground measurement system characterized in that the measurement results are created and displayed on the display device each time the travel distance of the RI measuring instrument reaches a predetermined distance.

2. the traveling device has a rotating cylindrical body that can roll on the ground, 2. The ground measurement system according to claim 1, wherein the RI measuring device is housed inside the rotating cylinder.

3. 2. The ground measurement system according to claim 1, wherein the distance satisfies the condition of the following formula 1. L≧T×V (Formula 1) (In the formula, L is the distance, T is the measurement time at which the difference between the measurement result of the scattering-type RI measuring instrument and the measurement result of the transmission-type RI measuring instrument on a specific ground becomes approximately 10% or less, and V is the moving speed at which the difference between the measurement result of the scattering-type RI measuring instrument and the measurement result of the transmission-type RI measuring instrument 1 on a specific ground becomes approximately 10% or less.)

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