Vibration roller track control device for earth dam rolling construction

Abstract

The utility model relates to the technical field of earth dam rolling construction of water conservancy projects, and particularly discloses a rolling track control device of a vibrating roller. According to the device, the distance between the device and a target device, such as a horizontal pull rope, on the side of a preset grinding track is measured in real time through a distance measuring device installed on the vibrating roller, a double-threshold comparator in an electric control device is combined, audible and visual alarms with different frequencies are triggered, and real-time early warning of grinding track deviation is achieved. The double-threshold comparator is connected with the adjustable potentiometer to set the upper and lower limits of the safety distance. The device is further provided with a stabilizing mechanism comprising a vibration isolator and an inertial platform, and the distance measuring precision is improved. The target device can be provided with a plurality of pull ropes to enlarge the surface area of the target. Compared with traditional manual control or GPS control, the system has the advantages of being simple in structure, low in cost, free of signal delay, high in environmental adaptability, convenient and fast to maintain and the like, pressure leakage / overpressure can be effectively avoided, and the rolling quality and the construction efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering construction technology, and in particular to the technology for controlling the track of vibratory rollers in earth dam compaction construction. Background Technology

[0002] Earth dams are a widely used type of dam in water conservancy projects. The core construction process involves using a vibratory roller to compact the soil in layers to ensure the density, impermeability, and stability of the dam body. As a key compaction device, the vibratory roller significantly improves the compaction efficiency of soil by combining high-frequency vibration with static pressure (compaction depth can reach more than 1m, and productivity is 2-4 times higher than traditional static compaction machinery).

[0003] In earth dam compaction construction, the control of the vibratory roller's track directly determines the dam body quality, and its specific role is reflected in:

[0004] 1. Ensure dam body compaction: Vibratory rollers must repeatedly compact the soil along a predetermined trajectory to ensure uniform stress on the soil. If the roller track deviates (such as under-compaction or over-compaction), it will lead to insufficient compaction in some areas (for every 1% decrease in compaction, the dam body permeability coefficient increases by 1-2 orders of magnitude), causing leakage or settlement risks;

[0005] 2. Improve construction efficiency: Traditional manual operation requires repeated checks and corrections of the trajectory, and often requires repressurization, which is time-consuming and labor-intensive; if the matching degree between the actual trajectory and the predetermined trajectory can be improved through automation technology, rework can be reduced and the construction period can be shortened.

[0006] However, in traditional earth dam compaction construction, the control of vibratory roller tracks mainly relies on the operator's experience. Some projects use GPS positioning to assist in track control, but GPS technology has the following shortcomings: 1. High technical complexity: Adjusting positioning accuracy and optimizing trajectory matching require understanding data analysis and algorithm programs (such as Kalman filtering and path planning), and programming support is required, placing high demands on the knowledge of relevant personnel. 2. High cost: It requires high-precision positioning modules such as RTK-GPS, satellite communication equipment, and supporting software, resulting in a high total investment. 3. The GPS system needs to complete the entire process of "signal reception → data transmission → coordinate calculation → trajectory comparison → alarm triggering," which involves signal transmission delay (usually 0.1-0.5 seconds) and algorithm calculation delay (such as 0.2-0.3 seconds for path matching), leading to delayed early warning response and potentially missing the best adjustment opportunity (e.g., when the vibratory roller travels at a speed of 2 m / s, a 0.5-second delay can cause a trajectory deviation of 1 m). 4. GPS technology relies on satellite signals. In narrow valleys, steep banks, or mountainous areas (such as canyon-type reservoirs) commonly encountered during earth dam construction, satellite signals are easily blocked by terrain or construction equipment (such as excavators and material stockpiles), leading to positioning failure or reduced accuracy (the error can reach 5-10cm or even higher).

[0007] In many earth dam compaction constructions, the control of the vibratory roller's track mainly relies on the operator's experience; manual operation is easily affected by factors such as fatigue and limited visibility, leading to problems such as under-compaction, under-compaction, over-compaction, or track deviation, which directly affect the uniformity and density of the dam body.

[0008] Compaction quality relies on post-construction testing (such as sampling testing with a nuclear density meter), which cannot provide real-time feedback and adjustments. This often leads to issues such as under-compaction rework or over-compaction (specific problems such as excessive compaction, soil structure damage, cracking, and uneven settlement). Utility Model Content

[0009] The purpose of this utility model is to provide a vibratory roller track control device for earth dam compaction construction, which improves compaction accuracy and construction quality through automated and real-time track monitoring and warning.

[0010] To achieve the above objectives, the vibratory roller track control device for earth dam compaction construction of this utility model includes a distance measuring device, an audible and visual alarm, and an electrical control device installed on the vibratory roller. The electrical control device is connected to the audible and visual alarm. A target device is provided on one side of the predetermined track of the vibratory roller, and the distance measuring device is used to continuously measure the distance between the vibratory roller and the target during the operation of the vibratory roller.

[0011] The electronic control device is connected to a dual threshold comparator, which has a first non-inverting input, a second non-inverting input, a first inverting input, a second inverting input, a first output, and a second output.

[0012] The first non-inverting input of the dual threshold comparator is connected to a first potentiometer, which is used to provide an adjustable reference threshold voltage to set the lower limit distance V_low of the safe distance range between the vibratory roller and the target.

[0013] The second inverting input of the dual threshold comparator is connected to a second potentiometer, and the second potentiometer is used to provide an adjustable reference threshold voltage to set the upper limit distance V_high of the safe distance range between the vibratory roller and the target;

[0014] The output of the ranging device is connected to the first inverting input and the second non-inverting input of the dual threshold comparator; the first output and the second output of the dual threshold comparator are respectively connected to the electronic control device to transmit switching signals.

[0015] The target device includes a pull rope parallel to the predetermined grinding track. The pull rope extends horizontally, and one end of the pull rope is connected to a mechanical tension gauge. The mechanical tension gauge is used to assist the operator in controlling the tension of the pull rope to maintain its horizontal state. One end of the pull rope is connected to a temporary fixed object through the mechanical tension gauge, and the other end of the pull rope is directly connected to a temporary fixed object at the other end.

[0016] The target device is provided with two or more channels connected vertically.

[0017] The vibratory roller is equipped with a stabilizing mechanism, which includes a vibration isolator installed on the vibratory roller, an inertial stabilizing platform installed on the vibration isolator, and a rangefinder installed on the inertial stabilizing platform.

[0018] The ranging device is an ultrasonic distance sensor, an infrared distance sensor, or a laser distance sensor.

[0019] There are two audible and visual alarms, namely the first audible and visual alarm and the second audible and visual alarm; the first audible and visual alarm emits a relatively high-frequency alarm sound and a relatively high-frequency flashing light, and the second audible and visual alarm emits a relatively low-frequency alarm sound and a relatively low-frequency flashing light.

[0020] The second audible and visual alarm is triggered when the measured distance between the vibratory roller and the target is less than the lower limit distance V_low, and the first audible and visual alarm is triggered when the measured distance between the vibratory roller and the target is greater than the upper limit distance V_high.

[0021] This utility model has the following advantages:

[0022] This invention features a simple structure and low cost. It issues a real-time alarm when the vibratory roller deviates from the predetermined path (exceeding the safe range), prompting workers to adjust the roller's direction to return it to the predetermined path. Compared to manual experience-based control, it provides real-time feedback and adjustment, preventing underpressure or overpressure. Compared to GPS-controlled roller tracks, this invention significantly reduces technical complexity and requires less knowledge from personnel. Since it is unlikely to experience signal obstruction due to narrow valleys, steep banks, or mountainous areas, it is more environmentally adaptable. The absence of signal transmission delays and algorithm calculation delays between the ground and the sky ensures higher real-time performance, preventing delayed alarms that could lead to significant track deviations. Furthermore, compared to GPS-controlled roller tracks, this invention does not rely on software programs or complex electronic components, resulting in higher reliability. Potential failure points are concentrated in only a few components such as the rangefinder and potentiometers; repairs only require replacing damaged components, and ordinary construction workers can perform maintenance with simple training, significantly reducing maintenance costs. Adjusting the safe distance range also requires no specialized software or algorithm knowledge; simply adjusting the first and second potentiometers is sufficient, allowing ordinary workers greater flexibility.

[0023] The pull rope is easy to set as a target parallel to the roller track, allowing for convenient distance-based control of the track. Both ends of the rope connect to temporary fixtures on the construction site, enabling flexible and adaptable connections, making it suitable for use on any construction site.

[0024] For pull ropes of the same specifications and model, given a fixed length, the lower limit of tension required to maintain a basically horizontal state is fixed. Therefore, only one test is needed to determine the lower limit. During use, a mechanical tension meter can be used to ensure the horizontal state of the pull rope. Workers only need to tighten and secure the pull rope before the tension drops to the lower limit. Of course, in most cases, the tension of the pull rope will not drop to the lower limit during use, so there is no need for manual tensioning of the pull rope midway.

[0025] Setting up two or more target devices can increase the area of ​​the target devices, making it easier for the range measuring device to align with the target devices and perform effective distance measurement.

[0026] Stabilization mechanisms can significantly improve the stability of rangefinders during operation, thereby maintaining ranging availability and accuracy in vibrating environments.

[0027] Two audible and visual alarms visually indicate to staff whether the distance is too far or too close by distinguishing between the different alarms and the different alarm frequencies, saving staff time in judging whether the distance is too far or too close and helping staff to correct the tracks of the vibratory roller more quickly. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model.

[0029] Figure 2 yes Figure 1 Enlarged view of the vibratory roller section.

[0030] Figure 3 This is a schematic diagram of the electrical control structure of this utility model.

[0031] Figure 4 This is a schematic diagram of the present invention. Detailed Implementation

[0032] like Figures 1 to 4 As shown, the vibratory roller track control device for earth dam compaction construction of this utility model includes a distance measuring device 2, an audible and visual alarm and an electronic control device 3 installed on the vibratory roller 1. The electronic control device 3 (such as the IO port of a single-chip microcomputer) is connected to and drives the audible and visual alarm. A target device is provided on one side of the predetermined track of the vibratory roller 1. The distance measuring device 2 is used to continuously measure the distance between the vibratory roller 1 and the target during the operation of the vibratory roller 1.

[0033] The electronic control device 3 is connected to a dual threshold comparator 4 (such as LM393). The dual threshold comparator 4 has a first non-inverting input terminal, a second non-inverting input terminal, a first inverting input terminal, a second inverting input terminal (connected to ranging), a first output terminal (outputting a high level VCC or a low level GND to indicate the comparison result), and a second output terminal.

[0034] The non-inverting input terminal of the first comparator 4 is connected to a first potentiometer 5, which is used to provide an adjustable reference threshold voltage to set the lower limit distance V_low of the safe distance range between the vibratory roller 1 and the target.

[0035] The inverting input terminal of the second comparator 4 is connected to a second potentiometer 6, which is used to provide an adjustable reference threshold voltage to set the upper limit distance V_high of the safe distance range between the vibratory roller 1 and the target.

[0036] The output terminal of the distance measuring device 2 is connected to the inverting input terminal and the non-inverting input terminal of the second comparator 4 (such as IN1- and IN2+ of LM393). The inverting input terminal receives the analog signal V_in output by the distance measuring device 2 and compares it with V_low; the non-inverting input terminal receives V_in output by the distance measuring device 2 and compares it with V_high.

[0037] The first output terminal and the second output terminal of the second comparator 4 are respectively connected to the electronic control device 3 (such as OUT1 and OUT2 of LM393 are respectively connected to the IO interfaces P2.0 and P2.1 of the single-chip microcomputer), and transmit digital quantity signals.

[0038] When V_in < V_low (the vibratory roller 1 is too close), the first output terminal outputs a high level (triggering the "too close" alarm); otherwise, it outputs a low level (normal).

[0039] When V_in > V_high (the vibratory roller 1 is too far), the second output terminal outputs a high level (triggering the "too far" alarm); otherwise, it outputs a low level (normal).

[0040] When both the first output terminal and the second output terminal output low levels, it means that the distance falls within the safe distance range and no alarm is required.

[0041] The electronic control device 3 can be a single-chip microcomputer or an integrated circuit board.

[0042] This invention features a simple structure and low cost. It issues a real-time alarm when the vibratory roller 1 deviates from the predetermined path (exceeding the safe range), prompting workers to adjust its direction to return it to the predetermined path. Compared to manual experience-based control, it provides real-time feedback and adjustment, preventing underpressure or overpressure. Compared to GPS-controlled track technology, this invention significantly reduces technical complexity and requires less knowledge from personnel. Since it is unlikely to experience signal obstruction due to narrow valleys, steep banks, or mountainous areas, it is more environmentally adaptable. The absence of signal transmission delays and algorithm calculation delays between the ground and the sky results in higher real-time performance, preventing delayed alarms that could lead to significant track deviations. Furthermore, compared to GPS-controlled track technology, this invention does not rely on software programs or complex electronic components, resulting in higher reliability. Potential failure points are concentrated in only a few components such as the rangefinder and potentiometer; repairs only require replacing damaged components, and ordinary construction personnel can perform maintenance with simple training, significantly reducing maintenance costs. Adjusting the safe distance range does not require specialized software or algorithm knowledge; simply adjusting the first potentiometer 5 and the second first potentiometer 5 is sufficient, allowing ordinary workers to complete the task with greater flexibility.

[0043] The target device includes a pull rope 7 parallel to the predetermined grinding track. The pull rope 7 extends horizontally, and one end of the pull rope 7 is connected to a mechanical tension gauge 8. The mechanical tension gauge 8 is used to assist the operator in controlling the tension of the pull rope 7 to maintain its horizontal state. One end of the pull rope 7 is connected to a temporary fixed object 9 (such as temporarily unused construction machinery or temporarily piled materials) through the mechanical tension gauge 8, and the other end of the pull rope 7 is directly connected to the temporary fixed object 9 at the other end.

[0044] The pull rope 7 is easily set as a target parallel to the roller track, thus facilitating control of the roller track through distance control. Both ends of the pull rope 7 are connected to temporary fixtures 9 at the construction site, allowing for convenient and adaptable connection to various site conditions, making it suitable for use on construction sites.

[0045] For pull ropes 7 of the same specifications and model, given a fixed length, the lower limit of tension required to maintain a basically horizontal state is fixed. Therefore, only one test is needed to determine the lower limit of tension. During use, the horizontal state of the pull rope 7 can be ensured by using a mechanical tension meter 8. The operator only needs to tighten and secure the pull rope 7 before the tension drops to the lower limit value. Of course, in most cases, the tension of the pull rope 7 will not drop to the lower limit value during use, so there is no need for manual tightening of the pull rope 7 midway.

[0046] The target device is provided with two or more channels connected vertically. The arrangement of two or more target channels can increase the area of ​​the target device, making it easier for the ranging device 2 to align with the target device and perform effective distance measurement.

[0047] A stabilizing mechanism is installed on the vibratory roller 1. The stabilizing mechanism includes a vibration isolator 10 installed on the vibratory roller 1, an inertial stabilizing platform 11 installed on the vibration isolator 10, and a rangefinder installed on the inertial stabilizing platform 11.

[0048] Stabilization mechanisms can significantly improve the stability of rangefinders during operation, thereby maintaining ranging availability and accuracy in vibrating environments.

[0049] The ranging device 2 is an ultrasonic distance sensor, an infrared distance sensor, or a laser distance sensor.

[0050] There are two audible and visual alarms, namely a first audible and visual alarm 12 and a second audible and visual alarm 13; the first audible and visual alarm 12 emits a relatively high-frequency alarm sound and a relatively high-frequency flashing light, and the second audible and visual alarm 13 emits a relatively low-frequency alarm sound and a relatively low-frequency flashing light.

[0051] When the measured distance between the vibratory roller 1 and the target is less than the lower limit distance V_low, the second audible and visual alarm 13 is triggered; when the measured distance between the vibratory roller 1 and the target is greater than the upper limit distance V_high, the first audible and visual alarm 12 is triggered.

[0052] The two audible and visual alarms visually indicate to the staff whether the distance is too far or too close by distinguishing between the different alarms and the different alarm frequencies, saving the staff time to judge whether the distance is too far or too close, and helping the staff to correct the tracks of the vibratory roller 1 more quickly.

[0053] Follow these steps to use:

[0054] I. On-site deployment

[0055] 1. Target device installation

[0056] Based on the predetermined compaction track (design trajectory) for earth dam compaction, a target device is set on one side of the track (usually parallel to the side of the track). The target device adopts a rope-stayed structure.

[0057] Select temporary fixed objects 9 (such as idle construction machinery or temporary material piles) at the construction site as the fixing points at both ends of the pull rope 7 to ensure that the extension direction of the pull rope 7 is strictly parallel to the predetermined rolling track.

[0058] One end of the pull rope 7 is connected to a fixed object via a mechanical tension gauge 8, and the other end is directly connected to a fixed object on the other side. The tension of the pull rope 7 is adjusted by the mechanical tension gauge 8 to keep the pull rope 7 in a horizontal state (the tension must exceed the "lower limit value of tension" determined in advance through testing to ensure that the pull rope 7 does not sag significantly).

[0059] If the construction environment is complex (such as the length of the rope 7 being long or the distance measuring device 2 being difficult to align), two or more target devices can be set up in parallel, with adjacent target devices placed together to expand the target area and improve the reliability of the distance measuring device 2 alignment.

[0060] 2. Installation of equipment at one end of the vibratory roller

[0061] Install a stabilizing mechanism at a suitable location on the vibratory roller 1 body (such as the top or side of the cab): fix the inertial stabilizing platform 11 with the vibration isolator 10, and install the ranging device 2 (ultrasonic / infrared / laser sensor) on the inertial stabilizing platform 11 to reduce the impact of the vibration of the vibratory roller 1 on the ranging accuracy.

[0062] 3. Install the electronic control device 3 (including the dual threshold comparator 4LM393, potentiometer and other circuit modules) and the audible and visual alarm (first audible and visual alarm 12: high-frequency sound + high-frequency flashing light; second audible and visual alarm 13: low-frequency sound + low-frequency flashing light), and connect the ranging device 2, the electronic control device 3 and the audible and visual alarm through the line to ensure stable signal transmission.

[0063] 4. System calibration and parameter setting

[0064] Start the vibratory roller 1 and drive it to the initial position of the predetermined roller track. Measure the initial distance (i.e., the center value of the safe distance range) between the roller and the pull rope 7 using the distance measuring device 2.

[0065] Adjust the first potentiometer 5 (corresponding to V_low) and the second potentiometer 6 (corresponding to V_high) in the electronic control device 3 to set the safe distance range (the lower limit V_low is "initial distance - 5cm", and the upper limit V_high is "initial distance + 5cm") to ensure that the vibratory roller 1 does not alarm within the predetermined trajectory ±5cm range.

[0066] II. Track Control Operation Phase

[0067] 1. Real-time ranging and signal transmission

[0068] After the vibratory roller 1 starts rolling operation, the distance measuring device 2 continuously measures the real-time distance to the pull rope 7 at a high frequency (such as 50Hz) and converts the distance signal into a voltage value V_in, which is synchronously transmitted to the dual threshold comparator 4 of the electronic control device 3.

[0069] 2. Distance comparison and alarm triggering

[0070] The dual threshold comparator 4 performs real-time comparison of V_in:

[0071] If V_in < V_low (the measured distance is less than the safety lower limit, i.e., the vibratory roller 1 is too close): The first output terminal outputs a high level, triggering the second audible and visual alarm 13 (low-frequency sound + low-frequency flashing light), prompting the operator that the track is too close to the pull rope 7 and needs to adjust the vibratory roller 1 away from the pull rope 7.

[0072] If V_in > V_high (the measured distance is greater than the safety upper limit, i.e., the vibratory roller 1 is too far): The second output terminal outputs a high level, triggering the first audible and visual alarm 12 (high-frequency sound + high-frequency flashing light), prompting the operator that "the track is too far and needs to be adjusted towards the pull rope 7".

[0073] If V_in is between V_low and V_high (safe range): Both output terminals are at a low level, without alarm, and the operator does not need to adjust the current track of the vibratory roller 1.

[0074] 3. Manual Intervention and Trajectory Correction

[0075] The operator quickly judges the deviation direction according to the alarm type (sound frequency, light flashing frequency, and the audible and visual alarm that issues the alarm), and corrects the track by adjusting the steering system of the vibratory roller 1 until V_in returns to the safe range and the alarm stops. This process does not rely on complex algorithms or satellite signals (both complex algorithms and satellite signals are factors causing alarm delay), and the response time ≤ 0.1 second (only including the ranging and circuit comparison time), avoiding large-scale track deviation caused by delay.

[0076] III. Stage of Transfer Installation and Use

[0077] 1. Dismantling at the Original Site

[0078] After completing the rolling task in the current area, disconnect the connection between the pull rope 7 and the temporary fixture 9 (loosen the mechanical tensiometer 8), reel in the pull rope 7 and mark the length for subsequent reuse; the equipment at the vibratory roller 1 end (ranging device 2, stabilizing mechanism, electric control device 3, alarm) remains fixed in place, and only the power supply needs to be disconnected and the circuit checked for looseness.

[0079] 2. Deployment at the New Site

[0080] After transporting to the new construction area, reset the pull rope 7 according to the预定碾迹 in the new area (the same steps as in the "On-site Deployment Stage"), ensure that the pull rope 7 is parallel to the new track, and adjust the tension to exceed the "tension lower limit value" through the mechanical tensiometer 8.

[0081] Start the vibratory roller 1, recalibrate the initial distance between the ranging device 2 and the pull rope 7, and readjust the potentiometer to set V_low and V_high according to the width or accuracy requirements of the new track (for example, the safe range is adjusted to ±8 cm).

[0082] IV. Stage of On-site Demolition and Storage

[0083] After the entire project is completed, disassemble the pull rope 7 and clean the surface dirt, then store it in a dry and ventilated place; the equipment at the vibratory roller 1 end does not need to be removed to facilitate future use. Wind the pull rope 7 onto the reel, marking its specifications (length, experimentally determined lower limit of tension at a specific length), and avoid exposure to sunlight or moisture. Clean the surfaces of the audible and visual alarm, distance measuring device 2, and electrical control device 3 with a soft cloth, then cover them with anti-static bags and moisture-proof bags to maintain a sealed state.

[0084] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for controlling the rolling track of a vibrating roller in the construction of an earth dam, characterized in that: It includes a distance measuring device, an audible and visual alarm, and an electronic control device installed on the vibratory roller, with the electronic control device connected to the audible and visual alarm; a target device is provided on one side of the predetermined roller track of the vibratory roller, and the distance measuring device is used to continuously measure the distance between the vibratory roller and the target during the operation of the vibratory roller; The electronic control device is connected to a dual threshold comparator, which has a first non-inverting input, a second non-inverting input, a first inverting input, a second inverting input, a first output, and a second output. The first non-inverting input of the dual threshold comparator is connected to a first potentiometer, which is used to provide an adjustable reference threshold voltage to set the lower limit distance V_low of the safe distance range between the vibratory roller and the target. The second inverting input of the dual threshold comparator is connected to a second potentiometer, and the second potentiometer is used to provide an adjustable reference threshold voltage to set the upper limit distance V_high of the safe distance range between the vibratory roller and the target; The output of the ranging device is connected to the first inverting input and the second non-inverting input of the dual threshold comparator; the first output and the second output of the dual threshold comparator are respectively connected to the electronic control device to transmit switching signals.

2. The earth dam construction roller track control device according to claim 1, characterized by: The target device includes a pull rope parallel to the predetermined grinding track. The pull rope extends horizontally, and one end of the pull rope is connected to a mechanical tension gauge. The mechanical tension gauge is used to assist the operator in controlling the tension of the pull rope to maintain its horizontal state. One end of the pull rope is connected to a temporary fixed object through the mechanical tension gauge, and the other end of the pull rope is directly connected to a temporary fixed object at the other end.

3. The embankment construction vibration roller track control device according to claim 2, characterized by: The target device is provided with two or more channels connected vertically.

4. The vibratory roller track control device for earth dam compaction construction according to any one of claims 1 to 3, characterized in that: The vibratory roller is equipped with a stabilizing mechanism, which includes a vibration isolator installed on the vibratory roller, an inertial stabilizing platform installed on the vibration isolator, and a rangefinder installed on the inertial stabilizing platform.

5. The embankment construction vibration roller track control device according to any one of claims 1 to 3, characterized by: The ranging device is an ultrasonic distance sensor, an infrared distance sensor, or a laser distance sensor.

6. The vibratory roller track control device for earth dam compaction construction according to claim 5, characterized in that: There are two audible and visual alarms, namely the first audible and visual alarm and the second audible and visual alarm; the first audible and visual alarm emits a relatively high-frequency alarm sound and a relatively high-frequency flashing light, and the second audible and visual alarm emits a relatively low-frequency alarm sound and a relatively low-frequency flashing light. The second audible and visual alarm is triggered when the measured distance between the vibratory roller and the target is less than the lower limit distance V_low, and the first audible and visual alarm is triggered when the measured distance between the vibratory roller and the target is greater than the upper limit distance V_high.

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