JP2019199709A - Groove evaluation device, groove evaluation system, and groove evaluation method - Google Patents

Abstract

To provide a technology capable of objectively evaluating the quality of construction immediately after construction of a pavement having vertical grooves.SOLUTION: A groove evaluation device 10 evaluates grooves in pavement in which the grooves were formed. A control unit 12 is included. The control unit 12 comprises: an input control part 21 for inputting groove measurement information; an index calculation part 22 for calculating a determination index based on the measurement information; a reference part 23 for referring to a database 14 for a correlation between the determination index and an evaluation item; and an evaluation part 24 for evaluating a groove to be measured based on the determination index calculated by the index calculation part 22 and the correlation referenced by the reference part 23.SELECTED DRAWING: Figure 7

Description

    The present invention relates to pavement technology, and more particularly to evaluation of pavements having longitudinal grooves.

  In the grooving pavement, a groove having a width of 6 to 9 mm and a depth of 4 to 6 mm is generally provided on the pavement surface at intervals of 40 to 60 mm. Grooving pavement has a vertical type (vertical groove) installed along the traveling direction of the vehicle and a horizontal type (horizontal groove) installed in the transverse direction.

  Vertical grooving is mainly used on road surfaces with many curves that require an increase in the slip resistance value in the lateral direction. Horizontal grooving has an excellent effect mainly in shortening the braking distance of the vehicle, and is used in front of a slope or an intersection. In addition, horizontal grooving can give drivers warnings such as cues, snooze driving, overspeed, etc. by the sound and vibration generated during driving.

  In addition to increasing slip resistance, it promotes drainage, dries the road surface quickly, and prevents slippage when it rains. In particular, it exhibits a hydroplaning suppressing effect.

  Furthermore, in the cold region, in addition to the remarkable anti-slip effect, the anti-freezing effect, the snow accumulation preventing effect, and the snow melting effect are exhibited. In the grooving pavement, the road surface becomes uneven and the surface area is increased, and a groove space is formed. In addition, when a medicine such as calcium chloride is sprayed as an antifreeze agent, a part of the medicine remains in the groove even when passing through the vehicle, so that the snow melting effect is sustained. Even when water on the road surface freezes and black ice burn occurs, the effect of accelerating black ice burn breakage is exhibited by contact with a tire of a passing vehicle.

  The main grooving method in asphalt pavement is cutting with a dedicated machine. After constructing in the same way as general paving, the cutting process is performed. Therefore, compared with general pavement, there exists a subject that construction cost becomes high and a construction period becomes long.

  Furthermore, a dust treatment process is required in the cutting process, and in this respect as well, there are problems related to the construction cost and the construction period.

  On the other hand, there is a tine grooving method as one of the grooving methods in concrete pavement. Groove the pavement surface using a piano wire or the like in the direction across the road during concrete paving. However, the tine grooving method is suitable for forming horizontal grooves, but is not suitable for forming vertical grooves. Also, the drainage effect is insufficient.

  In response to the above problem, the applicant of the present application has proposed a longitudinal groove forming technique that is easy to construct (Patent Document 1).

  In the technique according to Patent Document 1, a pavement longitudinal groove forming tool composed of a plurality of beam members arranged in parallel with the screed device traveling direction as the axial direction is used on the lower surface of the screed device.

  When the pavement surface is leveled by the screed, the beam member is pushed into the leveling surface, and in a state where the beam member is pushed into the leveling surface, the beam member is driven in the traveling direction of the screed device and Is formed.

  According to this technique, it is easier to form longitudinal grooves than the cutting method or the tine grooving method. As a result, the construction cost and construction period can be reduced.

Japanese Patent No. 5913753

  The applicant of the present application has applied this technology to the main construction. The construction results up to the end of 2017 are 300,000 square meters, which is steadily accumulating results. In addition, construction expectation of 2018 is 100,000 square meters.

  We have also verified that the vertical groove pavement with this technology has the effects of improving slip resistance, improving drainage and reducing noise.

  However, the verification test is performed by a special engineer using a predetermined device. Immediately after construction, the operator or on-site supervisor evaluates the quality of construction by visual inspection. That is, there was no objective evaluation method.

  This invention solves the said subject, and it aims at providing the technique which evaluates the quality of construction immediately after construction of the pavement which has a vertical groove.

  The present invention that solves the above problems is a groove evaluation device that evaluates a groove of a pavement in which grooves are formed, and has a control unit, and the control unit inputs an input control unit that inputs measurement information of the groove, An index calculation unit that calculates a determination index based on the measurement information, a reference unit that refers to a database for a correlation between the determination index and the evaluation item, a determination index calculated by the index calculation unit, and the reference unit An evaluation unit that evaluates a groove to be measured based on the referenced correlation.

  According to the present invention, immediately after the construction, an objective evaluation of the quality of construction can be shown to an operator or a field supervisor.

  In the above invention, preferably, the measurement information is depth information for each groove width direction.

  In the above invention, preferably, the determination index is calculated based on a cross-sectional area of the groove.

  Thereby, an objective index can be obtained.

  Preferably, in the above invention, the determination index is weighted and corrected based on the depth.

  Preferably, in the above invention, the determination index is weighted and corrected based on the groove shape classification.

  These corrections improve the evaluation accuracy.

  Preferably, in the above invention, the evaluation unit evaluates at least one of the evaluation items of texture depth, slip resistance value, water permeation amount, and noise reduction amount.

  This can give physical significance to the index.

  The present invention that solves the above-described problems includes a groove measuring unit that measures groove information, a database that is stored for the correlation between the determination index and the evaluation item, the control unit described above, and the evaluation of the evaluation unit. Display means for displaying the result.

  Preferably, in the above invention, a recording means for recording the measurement information of the groove, the determination index, and the evaluation result is provided.

  As a result, each time construction results increase, the accuracy of the correlation improves and the evaluation accuracy improves.

  In the evaluation method of the present invention that solves the above problems, a pavement having a groove is formed, and a groove measuring device is installed so as to face the groove, and the groove measuring device is used as measurement information for each groove width direction. Measuring the depth, the groove evaluation device inputs the measurement information of the groove, calculates a determination index based on the measurement information, refers to the database for the correlation between the determination index and the evaluation item, the measurement information Based on the determination index calculated based on the above and the correlation referenced by the reference unit, the groove that is the measurement target is evaluated, and the evaluation result is output.

  According to the present invention, the quality of the construction can be objectively evaluated immediately after the construction of the pavement having the longitudinal grooves.

Vertical groove forming device outline (asphalt finisher) Outline of vertical groove formation (screed) Vertical groove forming pavement Device usage example Example of groove measurement Device configuration diagram Functional block diagram Control flow diagram Correlation example Cross-sectional shape modification Reference example Evaluation method not based on this application Reference example Measurement example with mold gauge

<Vertical groove pavement>
The pavement having a longitudinal groove proposed by the present applicant will be briefly described.

  The asphalt finisher used for paving was provided with a crawler for traveling, a driver's seat for the operator to perform driving work, a hopper provided in front of the driver's seat, in which the asphalt mixture was introduced from the dump truck, and A bar feeder that conveys the asphalt mixture to the rear, a screw spreader that is provided behind the driver's seat and uniformly spreads the asphalt mixture over the pavement width, and a tamper that is provided behind the screw spreader and compacts the asphalt mixture. It is composed of various member devices such as a main body screed and a stretch screed for spreading and leveling the asphalt mixture. A wheel may be used instead of the crawler.

  FIG. 1 shows a schematic diagram of an asphalt finisher. FIG. 2 shows the screed.

  Further, as a characteristic configuration, a longitudinal groove forming tool 111 is provided on the lower surface of the base plate of the screed (see FIG. 2).

  The longitudinal groove forming instrument 111 includes a plurality of beam members 112. The beam members 112 are arranged in parallel with the screed traveling direction as the axial direction.

  The beam member 112 has a cross-sectional width of 2 mm to 30 mm and a cross-sectional height of 5 mm to 30 mm. Preferably, the beam member 112 has a cross-sectional width of 5 mm to 20 mm and a cross-sectional height of 5 mm to 20 mm. The length of the beam member 112 is 50 to 110% of the screed bottom length. The centers of the beam members 112 are arranged at intervals of 20 mm to 100 mm. Preferably, the centers of the beam members 112 are arranged at intervals of 20 mm to 50 mm.

  The beam member 112 may be welded to the lower surface of the base plate of the screed or may be mechanically joined. For example, if it is a screw type, exchange is easy and the cross-sectional shape and magnitude | size of a beam member can be selected.

  The longitudinal groove forming tool 111 is used for forming the longitudinal groove.

  The asphalt mixture is manufactured at the compounding plant, transported to the construction site by the dump truck, and then put into the hopper from the dump truck. The asphalt mixture temporarily stored in the hopper is conveyed by a bar feeder, spread by a screw spreader, and spread by a main body screed and a telescoping screed.

  The asphalt finisher has a crawler (or wheel), and proceeds slowly at a constant speed in the longitudinal direction of the road while leveling to maintain the flatness of the pavement. At this time, the laying operation and the leveling operation are repeated continuously.

  After finishing the leveling work with the asphalt mixture, the asphalt pavement surface is compacted by rolling with a roller.

  As a characteristic operation, when leveling the pavement surface, the beam member 112 is pressed against the leveling surface and moves in the leveling direction in the pressed state, and the vertical groove 120 is formed.

  The beam member 112 is provided on the lower surface of the base plate of the screed. The weight of the screed acts, and the beam member 112 is pushed into the leveling surface by the pressing force.

  As the asphalt finisher advances, the beam member 112 is driven while maintaining a state of being pushed into the leveling surface. The vertical groove 20 is formed corresponding to the trajectory due to the advance of the beam member 112.

  The extension of the longitudinal groove 120 corresponds to the travel distance of the beam member 112. The center interval between the adjacent vertical grooves 120 corresponds to the center interval between the beam members 112.

  Note that due to the roller rolling, the cross-sectional width of the vertical groove 120 becomes narrower than the cross-sectional width of the beam member 112, and the depth of the vertical groove 120 tends to be shallower than the cross-sectional height of the beam member 112. That is, the cross-sectional shape of the longitudinal groove 120 roughly corresponds to the cross-sectional shape of the beam member 112, but does not necessarily match. Thereby, the quality of construction occurs. In addition, the quality of construction also depends on the suitability of temperature management. Therefore, it is necessary to judge the quality of construction.

<Groove evaluation system and groove evaluation device>
In FIG. 4, the usage example of a groove | channel evaluation system and a groove | channel evaluation apparatus is shown.

  The groove evaluation system includes a groove measuring means 1 and an apparatus main body 10.

  The groove measuring means 1 is, for example, a laser measuring device. In the illustrated example, the laser measuring device main body 2, the bar 3, the drive mechanism 4, and the grounding unit 5 are included.

  The groove measuring means 1 is installed so that the bar 3 is orthogonal to the groove direction so as to straddle the plurality of grooves 120 via the grounding portions 5 and 5.

  The laser measuring device main body 2 moves on the bar 3 by the driving means 4. The laser measuring device main body 2 has laser light transmitting means and laser light receiving means, and can measure the distance by reflection of the laser light. Thereby, depth information for each groove width direction is obtained.

  FIG. 5 shows the actual measurement. The stroke length is 900 mm. The resolution in the stroke direction (groove width direction) is 1 mm. The resolution in the depth direction is 0.01 mm.

  The laser measuring device main body 2 is set at a position 150 mm above the pavement surface. A pavement having a longitudinal groove having a width of 12 mm, a depth of 12 mm, and a groove interval of 40 mm was measured.

  FIG. 6 shows the configuration of the apparatus main body 10. The apparatus main body 10 includes an input unit 11, a control unit 12, a storage unit 13, a database 14, a display unit 15, and a recording unit 16.

  The input unit 11 is an interface for inputting measurement information from the groove measuring means 1. For example, the laser measuring device main body 2 is connected by a cable.

  The control unit 12 includes a CPU (Central Processing Unit) and the like, and controls the apparatus 10. Details will be described with reference to a functional block diagram.

  The storage unit 13 includes a hard disk, a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The storage unit 13 stores various control programs for controlling the apparatus 10 and the like. Provide a working area.

  The database 14 is stored separately from the storage unit 13, but may be stored in the storage unit 13.

  The display unit 15 is configured by a liquid crystal display, for example, and displays characters and images to the user. The display unit 15 may be configured to include a touch panel as a user interface.

  The recording unit 16 records groove measurement information, determination indices, and evaluation results. For example, a flash memory, a hard disk or a memory card.

  FIG. 7 shows functional blocks of the control unit 12. The control unit 12 includes an input control unit 21, an index calculation unit 22, a reference unit 23, an evaluation unit 24, a display control unit 25, and a recording control unit 26.

  FIG. 8 shows a control flow, and the operation of the control unit 12 will be described.

  The input control unit 21 inputs depth information (measured value) for each groove width direction from the groove measuring means 1 (step S1).

  The index calculator 22 calculates a determination index based on the measurement information. Temporarily, the cross-sectional area of the groove is used as a determination index (step S2). Specifically, a plurality of determination indexes are acquired for each unit plane, and an average value is obtained.

  The database 14 stores the correlation between the determination index and the evaluation item.

  FIG. 9 shows an example of the correlation. We have also verified that the pavement has the effects of improving slip resistance, drainage, and reducing noise. For example, the amount of osmotic water (drainage) is in direct proportion to the determination index, but becomes constant when it exceeds a predetermined value. On the other hand, noise has a negative proportional relationship with the judgment index. A correlation equation can be calculated based on past experimental results.

  The reference unit 23 accesses the database 14 and acquires a correlation formula for each evaluation item (step S3).

  The evaluation unit 24 calculates an estimated value of each evaluation item based on the determination index calculated in step S2 and the correlation formula for each evaluation item (step S4). For example, if all evaluation items are within the optimal range, A is determined, and most evaluation items are within the optimal range, but if some are within the allowable range, B is determined, and most evaluation items are within the allowable range (for example, 3 out of 4) are judged as C, and if even one is in the inappropriate range, it is judged as D.

  The display control unit 25 displays and outputs the evaluation result on the display unit 15 (step S5). The recording control unit 26 records (outputs) the groove measurement information, the determination index, and the evaluation result in the recording unit 16. The data in the recording unit 16 is organized and transferred to the database. The database 14 is updated.

<Evaluation items>
It is known from past verification tests that the index related to the vertical groove has a correlation with texture depth, slip resistance value, water permeability, noise reduction amount, and the like.

  The road texture depth (MPD) is a measure of the roughness of the road surface. In the measurement of the texture depth, measurement is performed using a rotary texture depth measuring device (CT meter). The texture depth of the paved road surface may be measured using sand. Details of the test method are described in "Handbook of Pavement Survey Test Method (Japan Road Association) II Chapter 2 Section S022."

  The amount of infiltrated water is an index in a pavement structure that can smoothly infiltrate rainwater below the road surface. It is the amount of water that permeates for 15 seconds under the road surface of a circular paved road surface having a diameter of 15 cm. It is determined for each section where the thickness and material of the surface layer are the same. Details of the test method are described in "Handbook of Pavement Survey Test Method (Japan Road Association) II Chapter 2 Section S025".

  The slip resistance value is a performance that resists the slip of a vehicle or a person. There are one that measures the slip resistance of the paved road surface using a pendulum skid resistance tester (BPN) and one that measures the friction coefficient of the road surface using a slip resistance measuring device (DF tester) using a rotating disk. Details of the test method are described in "Handbook of Pavement Survey Test Method (Japan Road Association) II Chapter 2 Section S021".

  Noise reduction is to reduce the generation of noise by suppressing the generation of sound due to contact with automobile tires or absorbing the sound that collides with the road surface. The details of the test method are described in “Handbook of Pavement Survey Test Method (Japan Road Association) Chapter II Section 2 S027”.

<Indicator correction>
The applicant of the present application has proposed a new vertical groove forming method and a paving method, and has been conducting various studies on the effects of the vertical grooves. In addition to asphalt pavement, application to concrete slabs is also being considered.

  In FIG. 10, an example of the evaluation test result which concerns on the concrete floor slab which has a vertical groove is shown. For example, it is suggested that there may be a slight difference in the result due to the difference in cross-sectional shape (rectangle, inverted triangle, horseshoe shape, etc.).

  With this system, a huge amount of data can be easily acquired. In the future, the accuracy of the correlation formula will be improved by reflecting a huge amount of data.

  For example, this system has a scanning resolution of 0.02 to 2 mm in the width direction (1 mm in the example of FIG. 5), and can easily grasp and classify shapes. In the above description, the sectional area of the groove is tentatively used as the determination index. However, the determination index may be appropriately corrected based on the shape category. For example, if it is found that a noise reduction effect is high in a horseshoe shape or a rectangular shape longer in the depth direction than the width, in the evaluation relating to noise reduction, the upward correction may be performed based on the shape classification.

  Further, regarding the noise reduction effect, if it is found that the influence of the depth is large, the upward correction may be performed based on the depth. On the other hand, if it is found that the effect of the depth on the slip resistance value is small, downward correction may be performed based on the depth.

<Modification>
Above, an example of the groove evaluation system and the groove evaluation apparatus was shown. The present invention is not limited to this, and various modifications are possible within the scope of the technical idea of the present application.

  The apparatus main body 10 may have a communication unit. By having the communication function, the head office server can have configurations of the index calculation unit 22, the reference unit 23, the evaluation unit 24, the database 14, the recording unit 16, and the like of the control unit 12.

  Since the head office server has the database 14, construction data from all over the country is accumulated on the same day, and the accuracy of the correlation formula is improved by reflecting a huge amount of data.

  Moreover, since the head office server has the main functions of the control unit 12, the apparatus main body 10 can be simplified. For example, it can be replaced by installing a dedicated application on a smartphone or tablet. Commercially available smartphones and tablets include an external interface, user ROM, RAM, display screen, user interface, and the like as standard.

  By the way, in recent years, the progress of image analysis technology is remarkable. The depth information of the longitudinal groove can be obtained by image analysis. On the other hand, commercially available smartphones and tablets have a camera as a standard.

  Acquire a longitudinal groove image at the construction site and send it to the head office server. The head office server performs image analysis, performs evaluation based on the image information, and transmits the evaluation result to a smartphone or tablet on the construction site. The worker or the field supervisor confirms the evaluation result via the display screen of the smartphone or tablet.

  Furthermore, commercially available smartphones and tablets have a GPS device as a standard. It is possible to perform positional evaluation by adding position information.

  For example, if the evaluation tends to deteriorate as the amount of construction increases as compared to the start of construction, the replacement time is examined in consideration of wear of the beam member. If the evaluation on the right side of the traveling direction tends to be worse than the left side of the traveling direction, the setting of the longitudinal groove forming device is readjusted. Also, if the evaluation is poor in all areas, review the temperature management etc. drastically.

<Effect>
According to this system, immediately after the construction, an evaluation of the quality of the objective construction based on the physical index can be shown to the worker or the field supervisor.

  According to this system, the greater the construction record, the more data is reflected and the evaluation accuracy is improved.

  At present, verification tests for each evaluation item are performed in conjunction with the simple evaluation by this system, but with the improvement of the evaluation accuracy of this system, the verification test will be reduced, and in the future the quality of construction will be evaluated based on the simple evaluation. Judgment can be made.

<Reference example>
The applicant of the present application has proposed a new vertical groove forming method and a pavement method, and is also examining its evaluation method. The process leading to the present invention will be described with reference examples of the present application.

  A plurality of cross-sectional dimensions (width × height) of the longitudinal groove after roller rolling were measured. An example of a measurement memo is attached to FIG. For convenience, the longitudinal groove shape is shown upside down. The cross-sectional area was calculated by assuming that the cross-section is a substantially triangular shape. A mold gauge was used to measure the cross-sectional dimensions. FIG. 12 shows an example of measurement using a mold taking gauge.

  If the standard of the beam member to be used is determined as one, the longitudinal groove sectional area itself after the rolling may be used as an index (not compared with the effective sectional area of the beam member as described later). We call it "sharpness" as an index of construction quality. For example, sharpness over 65 is "no rolling pressure", sharpness over 65-35 is "deep groove", sharpness over 35-30 is "clear", sharpness over 30-25 is "standard", and sharpness 25- A value exceeding 15 is defined as “thin”, and a value of 15 or less is defined as “ultra-thin”.

In the example of FIG. 11, the average value of the longitudinal groove cross-sectional area obtained by the measurement is 31 mm ² , the sharpness is 31, and the construction result is evaluated as “clear”.

  In addition, when deviating from the temperature control range, the construction result was often “thin” or “ultra-thin”. That is, sufficient sharpness was not obtained.

  Further, the ratio (percentage) between the longitudinal groove cross-sectional area and the beam member effective cross-sectional area obtained by the measurement may be used as an index (definition) of quality of the construction result. According to this, objective evaluation is possible without unifying the beam member standards.

For example, when the effective sectional area of the beam member is 142.5 mm ² (= (16 + 3) * 15/2), the sharpness exceeding 46 is “no rolling pressure”, and the sharpness exceeding 46 to 25 is “deep groove”. The degree 25 to 21 is defined as "clear", the definition 21 to 18 is defined as "standard", the definition 18 to 11 is defined as "thin", and the definition 11 or less is defined as "ultra thin".

In the example of FIG. 11, the average value of the cross-sectional area of the longitudinal groove obtained by the measurement is 31 mm ² , and the sharpness is 21.7 compared with the effective cross-sectional area of the beam member, and the construction result is evaluated as “clear”.

  The inventor of the present application considered evaluating the quality of the construction of the longitudinal groove by the method according to the reference example. However, with the method according to the reference example, it is impossible to measure in large quantities, and the subjectivity of the measurer is mixed where the measurement point is. In addition, the relationship between the sharpness and other physical indices is unclear. Furthermore, since it is simplified when calculating the judgment index, there are problems such as insufficient accuracy.

  The usefulness of the longitudinal groove forming method and the pavement method proposed by the applicant of the present application is recognized, and construction results are steadily accumulated. The amount of construction is expected to increase dramatically in the future, and the method according to the reference example cannot cope with it, and the effective use of data is not sufficient.

  Due to the above circumstances, the present invention has been completed.

  The evaluation method according to the present application is proposed in correspondence with the new vertical groove forming method and pavement method proposed by the applicant of the present application, but is formed by a conventional vertical groove forming method (for example, a cutting method). The vertical groove may be evaluated. Further, the lateral groove may be evaluated.

DESCRIPTION OF SYMBOLS 1 Groove measuring means 2 Laser measuring instrument main body 3 Bar 4 Drive mechanism 5 Grounding part 10 Apparatus main body (groove evaluation apparatus)
DESCRIPTION OF SYMBOLS 11 Input part 12 Control part 13 Storage part 14 Database 15 Display part 16 Recording part 21 Input control part 22 Index operation part 23 Reference part 24 Evaluation part 25 Display control part 26 Recording control part 111 Vertical groove forming instrument 112 Beam member 120 Vertical groove

Claims (9)

A groove evaluation device for evaluating a groove of a pavement in which a groove is formed, having a control unit,
The controller is
An input control unit for inputting groove measurement information;
An index calculator that calculates a determination index based on the measurement information;
A reference section that references the database for the correlation between the judgment index and the evaluation item,
An evaluation unit that evaluates the groove to be measured based on the determination index calculated by the index calculation unit and the correlation referenced by the reference unit;
A groove evaluation apparatus comprising: The groove evaluation apparatus according to claim 1, wherein the measurement information is depth information for each groove width direction. The groove evaluation apparatus according to claim 1, wherein the determination index is calculated based on a cross-sectional area of the groove. The groove evaluation apparatus according to claim 3, wherein the determination index is weighted and corrected based on a depth. The groove evaluation apparatus according to claim 3, wherein the determination index is weighted and corrected based on a groove shape classification. The groove according to any one of claims 1 to 5, wherein the evaluation unit evaluates at least one of the evaluation items of texture depth, slip resistance value, water permeation amount, and noise reduction amount. Evaluation device. Groove measuring means for measuring groove information;
A database that stores the correlation between the determination index and the evaluation item;
A control unit according to any one of claims 1 to 6;
And a display means for displaying the evaluation result of the evaluation section. The groove evaluation system according to claim 7, further comprising recording means for recording the measurement information, determination index, and evaluation result of the groove. A pavement with grooves is formed,
A groove measuring device is installed to face the groove,
The groove measuring device measures the depth for each groove width direction as measurement information,
The groove evaluation device
Enter the measurement information of the groove,
Calculate a judgment index based on the measurement information,
Refer to the database for the correlation between judgment indicators and evaluation items,
Based on the determination index calculated based on the measurement information and the correlation referenced by the reference unit, the groove that is the measurement target is evaluated,
A groove evaluation method characterized by outputting an evaluation result.