JP2006170680A - Wheel tracking test method for pavement by means of random travel wheel load and wheel tracking tester for pavement by means of random travel wheel load - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly comprehend/evaluate the quality characteristics and deterioration durability strength of pavement material in a test environment where a running wheel load actually acting on a paved road is correctly simulated by executing a wheel tracking test standing on the actual condition of positional variation in a wheel running track of a vehicle that travels the paved road. <P>SOLUTION: A test wheel compared to the wheel of a vehicle traveling on a paved road is caused to repeatedly travel a number of times on a test specimen equipped with a structure of the same quality as a paved road under test and compared to the paved road under test. The test wheel is caused to travel along the same rectilinear track in a traveling direction X. With the test wheel apart from the test specimen after having traveled on the test specimen, the test specimen is moved to and positioned at a moving position changing in a moving direction Y different from the traveling direction X of the test wheel while randomly controlling the moving position and the occurrence frequency of the moving position according to a normal distribution characteristic. After the movement and positioning, the test wheel is caused to proceed to next traveling on the test specimen. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  This invention is a wheel for grasping / evaluating, by a simulation test, wear, deformation, and damage of a pavement surface caused by a traveling wheel load of a vehicle traveling on a paved road, quality of a pavement, deterioration durability strength, and the like. The present invention relates to a tracking test method and a wheel tracking test apparatus for executing the test method.

  As a method / apparatus for grasping / evaluating the state of wear, deformation, breakage or prediction of road pavement caused by the load (traveling wheel load) received from the wheels of a vehicle traveling on a paved road through simulation tests In addition, a wheel tracking test method and a wheel tracking test apparatus are conventionally known, and can be found in, for example, Japanese Patent Application Laid-Open No. 2002-214102 (Patent Document 1). The structure of the main part common to such conventional wheel tracking test methods and devices, that is, the interrelationship between the test specimens as viewed on the paved road under test and the test wheels as viewed as the wheels of the traveling vehicle (traveling wheels) As apparent from the paragraph [0003] of Patent Document 1 and the description of FIG. 5, the specimen 102 is fixed horizontally, and the test wheel 103 to which a load is applied is placed on the specimen 102. No reciprocating movement is made in the direction of the axle 103, and the reciprocating motion is repeated in the left-right direction as seen in FIG. In other words, the test wheel 103 repeatedly reciprocates on the specimen 102 with the same linear locus. Then, as the reciprocating motion of the test wheel 103 is integrated, as shown in FIG. 6 in the drawings of the present application, a single ridge 106 accompanying the reciprocating motion of the test wheel 103 is formed on the pavement layer 102c of the specimen 102. The depth and depth of the specimen 102 are gradually increased and the deformation and damage of the specimen 102 are gradually increased. Therefore, based on the relationship between the number of reciprocating movements of the test wheel 103 and the degree of deformation / damage of the specimen 102 (for example, the number of reciprocating movements required until the depth d of the flange 106 generated by the reciprocating movement of the test wheel 103 reaches 1 cm). Thus, it is possible to evaluate the deterioration durability of the specimen 102, that is, the deterioration durability of the pavement material on the paved road under test caused by the running wheel load of the vehicle. In Fig. 6 of the present application, 102a is a concrete floor slab of a paved road, 101c is an asphalt pavement layer, 102b is a waterproofing film material interposed between the concrete floor slab 102a and the asphalt pavement layer 102c, “Pavement material” is a general term for the asphalt pavement layer 102c and the waterproof membrane material 102b.

However, when actually observing the traveling trajectory group of wheels of a vehicle that travels frequently on a paved road, each wheel traveling trajectory group of the wheel traveling trajectory group is not concentrated only on a certain line on the road. In other words, it is known that they are distributed and distributed with different occurrence frequencies in the distribution area extending in the width direction of the road. That is, when observing the actual distribution of the wheel trajectory group, the position of each individual wheel trajectory that appears one after another changes randomly in the road width direction. Presenting a normal distribution of the standard deviation σ with the traveling locus as the center position, it is said that the characteristics of the distribution position of the wheel traveling locus and the frequency of occurrence of each distribution position show a so-called Gaussian distribution curve. Therefore, as in the conventional wheel tracking test method / apparatus, in the evaluation of the test result in which the test wheel 103 is reciprocated on a straight line on the specimen 102, the evaluation is based on the actual traveling wheel trajectory on the road. The problem that cannot be obtained is inherent. In addition, in order to correct this problem, the test wheel 103 is moved back and forth on the asphalt pavement layer 102c of the specimen 102 to change the position of the wheel traveling locus on the specimen each time. It is conceivable to move the test wheel 103 or the specimen 102 in the direction of the axle S of the test wheel 103 (in the direction of the arrow Y) while being in contact with the asphalt pavement layer 102c. As shown briefly in FIG. 6 and FIG. 6, the wall surface W1 of the eaves 106 formed on the specimen 102 and the side surface W2 of the test wheel 103 running on the eaves 101a come into contact with each other. A large contact pressure is generated, and an unnecessary abnormal force such as tearing in the axle S direction (arrow Y direction) of the test wheel 103 acts on the asphalt pavement layer 102c and the waterproof membrane material 102b. That. Accordingly, the test wheel 103 or the specimen 102 is moved in the direction of the axis S (arrow Y direction) of the test wheel 103 while the test wheel 103 is grounded to the specimen 102 while the test wheel 103 is running on the specimen 102. Even if it is moved, it will not be a pavement simulation test that matches the actual condition of the wheel traveling locus group of the vehicle traveling on the paved road.
Japanese Patent Laid-Open No. 2002-214102

  The present invention corrects the problems in the conventional wheel tracking test method and apparatus as described above, and sets up a test environment that imitates the actual condition of a vehicle traveling locus that actually varies randomly on a road, that is, a wheel traveling locus. The purpose of this is to perform a wheel tracking test in order to grasp and evaluate the quality deterioration degree and deterioration durability strength of the pavement material according to the actual wheel running state on the paved road. In addition, in a paved road structure in which asphalt pavement is applied to the concrete floor slab, an asphalt pavement layer is laminated on the concrete floor slab via a waterproof membrane material. The role of the waterproof membrane material in the pavement structure is extremely large. Therefore, the present invention is a pavement material, particularly a waterproof film material, in which a traveling wheel load is applied in accordance with the actual condition of a wheel traveling locus of a vehicle traveling on a paved road and an abnormal tensile force / tear force in the wheel axle direction is applied. The object is to obtain a wheel tracking test method and apparatus capable of grasping the actual state of damage / deterioration of the waterproof membrane material and the deterioration durability strength of the waterproof membrane material without being added to the above.

  As a wheel tracking test method for achieving the above-mentioned problems / objects, in the present invention, a vehicle that travels on a paved road on a specimen that has the same quality configuration as the test paved road and is regarded as the paved road to be tested. The test wheel, which is considered to be the wheel of the test vehicle, is repeatedly traveled several times, and in the repeated travel process, the test wheel is traveled on the same straight line locus in the traveling direction X, and the test wheel travels on the specimen. Is the range from the end of traveling to the position away from the specimen, and in the state where the test wheel has finished traveling on the specimen and is away from the specimen, the specimen is the traveling direction X of the test wheel. It is based on moving to the one movement position of the movement position which changes in the different movement directions Y at random, and making it move to the next run on the specimen after the movement positioning.

And, as a wheel tracking test method that achieves the above-mentioned problems and objectives based on the above basics, a vehicle that travels on a paved road with a specimen of the same quality as that of the paved road to be tested and viewed as the paved road to be tested The test wheel, which is considered to be the wheel of the test vehicle, is repeatedly traveled several times, and in the repeated travel process, the test wheel is traveled on the same straight line locus in the traveling direction X, and the test wheel travels on the specimen. Is the range from the end of traveling to the position away from the specimen, and in the state where the test wheel has finished traveling on the specimen and is away from the specimen, the specimen is the traveling direction X of the test wheel. Move to different movement directions Y, move and position the movement position and the frequency of occurrence of the movement position randomly according to the normal distribution characteristics, and test after the movement positioning To shift the wheel for the next running onto the specimen.

  On the other hand, as a wheel tracking test apparatus for executing the wheel tracking method according to the present invention to achieve the above-mentioned problems / objects, a test specimen that is considered to be a test paved road with the same quality configuration as the test paved road is provided. A slide table to be held; a test wheel that travels on the specimen as if it were a vehicle wheel traveling on a paved road; and a moving body to which the test wheel is mounted and a weight-adjustable load is applied at the bottom; A test wheel traveling means for causing the test wheel to travel along the same linear locus in the traveling direction X and to repeatedly travel in a range from the test wheel traveling on the specimen to reaching a position away from the specimen; Slide table moving position for positioning the held slide table by moving it to a moving position that randomly changes in the moving direction Y different from the traveling direction X of the test wheel Determining means; detecting that the test wheel has finished traveling on the specimen and located at a position away from the specimen, and generating a slide table movement position signal at each run of the test wheel at random; A slide table movement control signal generation circuit for generating a slide table movement control signal based on the table movement position signal; and a slide table drive / control circuit for driving and controlling the slide table movement positioning means based on the slide table movement control signal With a configuration

Further, as a further embodied wheel tracking test apparatus for solving the above-mentioned problem, a slide table that holds a specimen as if to be a test paved road with the same configuration as the test paved road; and runs on the paved road A test wheel that travels on the specimen as if it were a vehicle wheel; a moving body that has a test wheel attached to the bottom and that is loaded with a weight-adjustable load; And a test wheel traveling means for repeatedly traveling the test wheel on the specimen until it reaches a position away from the specimen; and a sliding table holding the specimen is moved in the running direction X of the test wheel. And a slide table moving positioning means for positioning by moving to a moving position that randomly changes in a moving direction Y different from that of the test wheel; Detecting that the position is away from the body, the slide table movement position and the frequency of occurrence of the movement position is generated randomly every time the test wheel travels according to the normal distribution characteristics, A slide table movement control signal generation circuit for generating a slide table movement control signal based on the slide table movement position signal; and a slide table drive / control circuit for driving and controlling the slide table movement positioning means based on the slide table movement control signal It is set as the structure provided with.

Further, the moving body equipped with the test wheel as the test wheel traveling means for reciprocally traveling the test wheel in the range of the same straight line locus in the traveling direction X and beyond the specimen to reach the position away from the specimen. One end of the connecting rod is pivotally supported at an eccentric position of the moving body driving rotator for reciprocating the moving body, and the other end of the connecting rod is pivotally supported by the moving body.

  Further, the slide table movement control signal generating circuit includes a test wheel position detector that detects that the test wheel has finished traveling on the specimen and is at a position away from the specimen and generates a test wheel position signal, and A random number generator that receives a test wheel position signal and outputs a normal random number x for each run of the test wheel, and based on the normal random number x, the moving position of the slide table and the frequency of occurrence of the moving position are normal distribution characteristics A slide table movement position calculation circuit that randomly generates a slide table movement position signal y according to the above, and a slide table control signal calculation circuit that generates a slide table movement control signal c based on the slide table movement position signal y To do.

Furthermore, from a practical point of view, the specimen is configured by asphalt pavement layer laminated on a concrete floor slab with a waterproof membrane material, and the traveling direction X of the test wheel and the moving direction Y of the specimen are orthogonal to each other. Set.

  And if the pavement wheel tracking test method and test apparatus for pavement with the random running wheel load according to the present invention as described above are used, based on the fluctuation / distribution actual condition of the wheel running locus which is said to fluctuate on the paved road according to the normal distribution characteristics. Therefore, the wheel tracking test can be executed after simulating the test environment. Deterioration durability strength can be grasped and evaluated. In addition, when conducting a wheel tracking test on a paved road made by laminating an asphalt pavement layer on a concrete floor slab via a waterproof membrane material, Different abnormal lateral pulling and tearing forces are not applied, and therefore, in accordance with the actual condition of the vehicle wheel trajectory traveling on the paved road, It is possible to correctly grasp and evaluate the deterioration durability strength of the waterproof membrane material.

  One of the best embodiments of the present invention is that on a specimen that looks like a test pavement with the same quality as a test pavement in which an asphalt pavement layer is laminated on a concrete floor slab via a waterproof membrane material. A test wheel resembling a vehicle wheel traveling on a paved road is reciprocated many times, and the test wheel to which a weight-adjustable load is applied in the reciprocating process travels in the same linear locus in the traveling direction X. In addition, the travel range of the test wheel is defined as the range from when the test wheel finishes traveling on the specimen until it reaches a position away from the specimen, and from the specimen after the test wheel finishes traveling on the specimen. In a separated state, the specimen is moved to a moving position that changes in the moving direction Y orthogonal to the traveling direction X of the test wheel, and the moving position and the frequency of occurrence of the moving position are randomly controlled according to the normal distribution characteristics. While moving Positioned by a random running wheels pavement tracking test method due to the load to shift the next running of the test wheel after the movement positioning onto specimen.

  Another embodiment of the present invention is that the test pavement is similar in structure to the test pavement in which the asphalt pavement layer is laminated on the concrete floor slab with a waterproof membrane material interposed therebetween. A slide table that holds a specimen; a test wheel that travels on the specimen as if it is a vehicle wheel traveling on a paved road; and a movement that is loaded with a weight-adjustable load with the test wheel mounted on the bottom One end of a connecting rod is pivotally supported at an eccentric position of a movable body driving gear that meshes with a body and a transmission gear rotated by a drive motor, and multiple ends of the connecting rod are pivotally supported by the movable body. A test wheel traveling means for reciprocating the test wheel in the range of the same linear locus in the traveling direction X and exceeding the specimen and reaching a position away from the specimen; a ball rotated by a servo motor screw A slide table movement positioning mechanism that is screwed to the slide table and moves the slide table holding the specimen to a movement position in the movement direction Y orthogonal to the traveling direction X of the test wheel; A test wheel position detector that detects that the test wheel has finished traveling on the specimen and is at a position away from the specimen, and generates a test wheel position signal; receives the test wheel position signal; A random number generator that outputs a normal random number x for each run, and based on the normal random number x, the slide table movement position and the frequency of occurrence of the movement position according to the normal distribution characteristics are randomly generated. The servo motor control signal c is generated based on the slide table moving position calculation circuit to be generated and the slide table moving position signal y. A servo motor control signal generation circuit including a servo motor control signal calculation circuit to be driven; a servo motor drive / control for driving the servo motor by controlling a rotation direction and a rotation speed of the servo motor based on the servo motor control signal c; This is a tracking test device for pavement with a random running wheel load equipped with a circuit.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a pavement wheel tracking test apparatus according to the present invention for a random running wheel load, FIG. 2 is a perspective view of a slide table moving positioning mechanism in the test apparatus, and FIG. 3 is a control circuit block diagram of the test apparatus. is there. FIG. 4 is an explanatory diagram of the movement relationship between the specimen in FIG. 1 and the test wheel traveling on the specimen, and FIG. 5 is a distribution frequency characteristic diagram of the traveling locus of the test wheel traveling on the specimen.

  In FIG. 1 to FIG. 5, reference numeral 1 denotes a specimen that is considered to be a paved road to be tested and evaluated (test paved road), and 2 is a test wheel that is assumed to be a wheel of a vehicle traveling on the paved road. The specimen 1 has the same configuration as the test paved road, and as shown in FIG. 4, an asphalt pavement layer 1c is laminated on a concrete floor slab 1a with a waterproof membrane material 1b interposed therebetween. The waterproof membrane material 1b is made of a material having high adhesion to the asphalt pavement layer 1c and the concrete floor slab 1a, and an asphalt coating film, a urethane resin, an asphalt waterproof sheet (a sheet having an asphalt film attached to a nonwoven fabric), or the like is used. . The waterproof membrane material 1b is disposed in order to prevent rainwater that has permeated from the asphalt pavement layer 1c or has penetrated into the asphalt pavement layer from cracks generated in the asphalt pavement layer 1c. Therefore, if the waterproof membrane 1b is torn or misaligned, water leaks into the concrete floor slab 1a and significantly deteriorates the concrete. Therefore, it reproduces a group of actual wheels on the paved road. It is practically necessary to test and evaluate the degree of deterioration and the durability of various waterproofing membrane materials 1b interposed between the concrete floor slab 1a and the asphalt pavement layer 1c by a wheel tracking test using a traveling wheel load. It is extremely important.

  3 is a slide table for mounting and holding the specimen 1, and 4 is a slide table movement positioning mechanism (slide table movement positioning means) that moves the slide table 3 to a predetermined position and positions it there. The mechanism 4 has the same structure as a conventionally known uniaxial slide table positioning mechanism as shown in FIG. That is, the slide table movement positioning mechanism 4 is placed horizontally on the guide rail 5 and is held along the guide rail 5 so as to freely reciprocate in the direction of the arrow Y, the servo motor 6, and the servo motor 6. And a ball screw 7 that is connected to the rotation shaft of the servo motor 6 and extends in parallel with the guide rail 5 and screwed into a part of the slide table 3. The rotation direction and rotation angle (rotation number) of the servo motor 6 are controlled. As a result, the rotation direction and the rotation angle of the ball screw 7 are controlled, and the slide table 3 screwed into the ball screw 7 and the specimen 1 held thereon are moved in the direction indicated by the arrow Y (on the paper surface in FIG. 1). The slide table 3 is prepared for the next movement of the slide table 3 by accurately moving to a predetermined position in the vertical direction, that is, in the direction of the axle of the test wheel 2 and stopping and positioning. Note that the drive source for moving and positioning the slide table is not limited to the rotary servo motor 6 as described above, and the slide table 3 is moved by a slide table moving and positioning means using a linear drive source such as a linear motor or a hydraulic control mechanism. Of course, it is also possible to position by moving in the arrow Y direction.

  Reference numeral 8 denotes a moving body that can be regarded as a vehicle body. The test wheel 2 is mounted on the bottom of the moving body 8, and a load body (a kind of weight) 9 capable of adjusting the weight is placed on the moving body 8. Then, a predetermined load corresponding to the traveling wheel load of the actual vehicle is applied to the test wheel 2 by the load body 9. The moving body 8 is supported and guided by the guide rail 10 and reciprocates in the direction of the arrow X. As the moving body 8 reciprocates, the test wheel 2 comes into contact with the test body 1 and While applying the load of the load body 9 on the specimen 1, it travels in the direction of arrow X. The means for applying the load to the test wheel 2 is not limited to the means for placing the load body 9 on the moving body 8 as described above, and for example, means for applying a fluid pressure capable of adjusting the pressure on the moving body 8. Is also possible.

The reciprocating range of the test wheel 2 in the direction of the arrow X is set to a range that exceeds the range of the upper surface of the specimen 1 and reaches the state in which the test wheel 2 is completely separated from the specimen 1. In FIG. 4, S represents the axle of the test wheel, and m ₀ represents one of the traveling trajectories of the test wheel 2 traveling on the specimen 1. 11 is a transmission gear that is rotated by a drive motor (not shown), 12 is a movable body drive gear that meshes with the transmission gear 11, 13 is a coupling rod that connects the movable body driving gear 11 and the movable body 8, and one end of the coupling rod 13 is The movable body 8 is pivotally supported by one end 8 a and the other end of the connecting rod 13 is pivotally supported by an eccentric shaft 12 a at an eccentric position of the movable body drive gear 12. When the movable body drive gear 12 is rotated by the drive motor via the transmission gear 11, the rotational motion of the movable body drive gear 12 is converted into the reciprocating linear motion of the movable body 8 via the connecting rod 13, and moved. The body 8 and the test wheel 2 reciprocate in the arrow X direction. Then, by changing the eccentric distance L of the eccentric shaft 12a, the range of reciprocation of the moving body 8 and the test wheel 2 (in FIG. 1, the distance between the position where the test wheel 2 is located on the leftmost side and the position on the rightmost side). ) Can be changed and adjusted. The moving body driving gear 12 generally means a moving body driving rotating body that is rotated by any means.

Reference numerals 14 and 15 denote test wheel position detectors (light detectors) that detect that the test wheel 2 has come to a position away from the specimen 1 in the reciprocating range of the test wheel 2 that reciprocates on the specimen 1. The test wheel position detectors 14 and 15 are arranged to face, for example, the side surface of the mobile drive gear 12 and change as the mobile drive gear 12 rotates. By detecting the position of the twelve eccentric shafts 12a in the left-right direction (arrow X direction), it is detected that the test wheel 2 has finished running on the specimen 1 and is separated from the specimen 1, and the test Wheel position detection signals d1 and d2 are output.

  What is important as a feature of the present invention is that the above-described reciprocating range of the test wheel 2 exceeds the range of the specimen 1 and reaches a position completely away from the upper surface of the specimen 1, that is, as shown in FIG. A state in which the test wheel 2 passes over the specimen 1 to the positions 2f and 2e and is completely separated from the specimen 1 (the test wheel 2 has reached positions 2f and 2e in FIG. 5). State), the servo motor 6 rotates to move the slide table 3 to a predetermined position in the arrow Y direction. In other words, the rotation of the servo motor 6 is controlled so that the specimen 1 does not move in the arrow Y direction when the test wheel 2 is on the specimen 1. In the above embodiment, the crossing angle between the moving direction of the slide table 3 and the specimen 1 (arrow Y direction) and the traveling direction of the test wheel 2 (arrow X direction) is 90 °, and the crossing angle is orthogonal. Is not necessarily limited to 90 °, and can be arbitrarily set depending on the purpose of the test. Therefore, in the wheel tracking test according to the present invention, the wall surface of the kite formed in the process in which the test wheel 2 travels on the specimen 1 and the side surface of the test wheel 2 come into contact with each other and the contact pressure of the specimen 1 The pavement material is prevented from applying an abnormal horizontal pulling force or tearing force.

FIG. 5 shows a specimen 1 simulating the relationship between the distribution of the wheel travel trajectory and the frequency of occurrence of each wheel travel trajectory based on the actual observation of the wheel travel trajectory group of the vehicle actually traveling on the paved road. It shows the state reproduced in a simulated manner on the wheel travel trajectory of the test wheel traveling above. In FIG. 5, 1 is a specimen, 2 is a test wheel that reciprocates on the pavement surface of the specimen 1 in the direction of arrow X, 2f and 2e indicate the positions of both ends of the reciprocating range of the test wheel 2, and 2f and 2e. Is a position where the test wheel 2 is completely separated from the specimen 1. m is a test wheel travel locus group generated in the process in which the test wheel 2 reciprocates many times on the specimen 1 and is composed of a large number of test wheel travel loci m ₀ to m _n having different positions on the specimen 1. Further, y in the vertical axis shows the distribution position of the test wheel traveling locus m ₀ ~ m _n on specimens 1, p of the horizontal axis represents the frequency of occurrence of each test wheel traveling locus m ₀ ~ m _n. Note that p represents the occurrence frequency of each test wheel travel locus m ₀ to m _n and at the same time the movement position of the slide table 3 and the specimen 1. Then, in light of the actual condition of the wheel traveling locus group of the vehicle actually traveling on the paved road, each traveling locus m ₀ to m _n constituting the test wheel traveling locus group m is randomly generated in time, and The occurrence frequency of the test wheel travel trajectories m ₀ to m _n is controlled to follow a normal distribution characteristic with the test wheel travel trajectory m ₀ having the highest occurrence frequency p in the center of the test wheel travel trajectory group m as the median value. ing. A curve G in FIG. 5 represents a normal distribution characteristic curve (Gaussian distribution curve) indicating the occurrence frequency characteristic of each test wheel travel locus m ₀ to _mn constituting the test wheel travel locus group m.

  Therefore, in order to execute the wheel tracking test in a state in which the actual wheel traveling trajectory characteristic of the vehicle traveling on the paved road is reproduced, the present invention keeps the reciprocating traveling position of the test wheel 2 in the arrow X direction at a constant position. In addition, prior to running the test wheel 2 on the specimen 1, the slide table 3 and the specimen 1 are moved in a predetermined movement direction in the arrow Y direction different from the reciprocating direction (arrow X direction) of the test wheel 2. It is controlled to move to the moving position y according to y, that is, the normal distribution characteristic, and to run the test wheel 2 on the specimen 1 after the movement. In the above embodiment, the slide table 3 is quickly moved to the predetermined movement position y and positioned by controlling the rotation direction and the rotation speed of the servo motor 6.

  That is, the movement timing and the movement position y of the slide table 3 and the specimen 1 in the arrow Y direction with respect to the reciprocating travel of the test wheel 2 in the arrow X direction are controlled by the control circuit shown in FIG. In FIG. 3, 6 is a servo motor that controls movement of the slide table 3 and the specimen 1 in the direction of arrow Y, 14 and 15 are the test wheel position detectors, 16 is a power source, and 17 is a servo motor drive / control circuit ( 18 is a servo motor control signal generation circuit (slide table movement control signal generation circuit), and a servo motor control signal generation circuit (slide table movement control signal generation circuit) 18 is connected to a random number generator 19. , A slide table moving position calculation circuit 20 and a servo motor control signal calculation circuit (slide table control signal calculation circuit) 21.

・・・・・式（１）
Then, as described above, the test wheel position detectors 14 and 15 detect that the test wheel 2 has finished traveling on the specimen 1 and is in a position away from the specimen 1, and thus the test wheel position signal d _1. , D ₂ , the random number generator 19 receives the test wheel position signals d ₁ , d _2, and is synchronized with the test wheel 2 every time when the test wheel 2 runs once. Then, one normal random number x is calculated and generated and output. The normal random number x can be generated by an operation based on the following equation (1) using two uniform random numbers U ₁ and U ₂ between 0 and 1, and the random number generator 19 The calculation program of Formula (1) is provided.

・ ・ ・ ・ ・ Formula (1)

・・・・・式（２）

但し、μ：発生頻度が最も大きい中心位置
σ：標準偏差
Next, the slide table movement position calculation circuit 20 receives the normal random number x, and generates and outputs a slide table movement position signal y by calculation based on the following equation (2) based on the normal random number x. Note that the slide table movement position calculation circuit 20 includes a calculation program of the formula (2). In this application, y represents the slide table movement position signal, and also means the movement position signal of the specimen held on the slide table, the movement position of the slide table 3 and the specimen 1.

・ ・ ・ ・ ・ Formula (2)

Where μ: center position where occurrence is highest σ: standard deviation

  Next, the servo motor control signal calculation circuit (that is, the slide table control signal calculation circuit) 21 receives the slide table movement position signal y, and moves the slide table to the slide table movement position y based on the slide table movement position signal y. A servo motor drive control signal (that is, a slide table movement control signal) c required to move 3 is calculated and output based on the formula: c = f (y). The servo motor control signal calculation circuit 21 has a calculation program of the formula: c = f (y). Then, the servo motor drive / control circuit (namely, slide table drive / control circuit) 17 receives the servo motor drive control signal (namely, slide table movement control signal) c, and the servo motor 6 is controlled based on the servo motor drive control signal c. By controlling the rotation direction and the number of rotations, the slide table 3 and the specimen 1 can be instantaneously moved to a predetermined moving position for positioning.

By performing repeated running control of the test wheel on the specimen and moving position control of the specimen as described above, a wheel tracking test can be performed in a test environment based on the actual condition of the wheel running trajectory that fluctuates randomly on the road. Thus, it is possible to grasp and evaluate the quality deterioration degree and deterioration durability strength of the pavement material in accordance with the actual wheel running state on the paved road.

  As described above, the pavement wheel tracking test method and the test apparatus according to the present invention for the random running wheel load according to the present invention is a pavement material under test conditions that are in line with the actual condition of the wheel running trajectory of the vehicle running on the paved road. It is possible to grasp and evaluate the deformation, breakage state, and deterioration strength of the road, so that it can be widely used industrially in the fields of development and commercialization of various paving materials, construction of paved roads, safety management, repair, etc. it can.

The side view of the wheel tracking test apparatus of the pavement by the random running wheel load concerning this invention. The perspective view of the slide table movement positioning mechanism in the test apparatus. FIG. 3 is a control circuit block diagram of the test apparatus. Explanatory drawing of the movement relationship between the specimen and the test wheel in the test apparatus. The distribution frequency characteristic figure of the wheel run locus of the test wheel of the test device. Schematic sectional view of a specimen and a test wheel during a conventional wheel tracking test.

Explanation of symbols

1: Specimen
1a: Concrete slab
1b: Waterproof membrane material
1c: Asphalt pavement layer 2: Test wheel 3: Slide table 4: Slide table movement positioning mechanism (slide table movement positioning means)
5: Guide rail 6: Servo motor 7: Ball screw 8: Moving body
8a: One end of the moving body 9: Load body 10: Guide rail 11: Transmission gear 12: Moving body driving gear (moving body driving rotator)
12a: Eccentric shaft 13 of moving body drive gear 13: Connecting rod 14: Test wheel position detector 15: Test wheel position detector 16: Power supply 17: Servo motor drive / control circuit (slide table drive / control circuit)
18: Servo motor control signal generation circuit (slide table movement control signal generation circuit)
19: Random number generator 20: Slide table movement position calculation circuit 21: Servo motor control signal calculation circuit (slide table control signal calculation circuit)
L: Eccentric distance of eccentric shaft of moving body drive gear R: Test wheel traveling means / moving body driving means S: Axle of test wheel X: Running direction of test wheel Y: Moving direction of slide table / Moving direction of specimen / Axle direction c of test wheel: Servo motor control signal (slide table movement control signal)
d ₁ : Test wheel position signal
d _2: test wheel position signal
m ₀ , m ₁ , m ₂ ... m _n : Test wheel travel locus
m ₀ : Test wheel traveling locus with the highest occurrence frequency m: Test wheel traveling locus group p: Test wheel traveling locus occurrence frequency / slide table moving position occurrence frequency /
Frequency of occurrence of movement position of specimen x: normal random number y: slide table movement position / slide table movement position signal /
Specimen movement position / Specimen movement position signal

Claims (11)

The test wheel, which has the same composition as the test paved road and is considered to be the test paved road, is repeatedly run several times with the test wheel set as the wheel of the vehicle running on the paved road. The test wheel travels along the same linear locus in the traveling direction X, and the travel range of the test wheel is the range from the test wheel finishes traveling on the specimen until it reaches a position away from the specimen. One moving position of the moving position that randomly changes in the moving direction Y different from the traveling direction X of the test wheel in a state where the wheel has finished traveling on the specimen and is separated from the specimen. The pavement tracking test method using a random running wheel load, wherein the test wheel is moved to the next run on the specimen after the move positioning. The test wheel, which has the same composition as the test paved road and is considered to be the test paved road, is repeatedly run several times with the test wheel set as the wheel of the vehicle running on the paved road. The test wheel travels along the same linear locus in the traveling direction X, and the travel range of the test wheel is the range from the test wheel finishes traveling on the specimen until it reaches a position away from the specimen. In a state where the wheel has finished traveling on the specimen and is separated from the specimen, the specimen is moved to a movement position that changes in a movement direction Y different from the traveling direction X of the test wheel. Random running characterized in that the frequency of occurrence of a moving position is controlled while being randomly controlled according to a normal distribution characteristic, and the test wheel is shifted to the next running on the specimen after the moving positioning. Tracking Test method pavement by wheel load.   3. The pavement tracking test with a random traveling wheel load according to claim 1 or 2, wherein the specimen has a structure in which an asphalt pavement layer is laminated on a concrete floor slab with a waterproof membrane material interposed therebetween. Method.   3. The pavement tracking test method according to claim 1 or 2, wherein the traveling direction X of the test wheel and the moving direction Y of the specimen are orthogonal to each other. A slide table that holds a specimen that is similar in structure to the test paved road and that is viewed as the test paved road; a test wheel that travels on the test specimen as a vehicle wheel traveling on the paved road; A moving body to which the test wheel is mounted and a weight-adjustable load is applied; the test wheel is made to travel along the same linear locus in the traveling direction X, and the test wheel has finished running on the specimen, and from the specimen Test wheel travel means for repeatedly traveling in a range up to a distant position; and moving the slide table holding the specimen to a travel position that randomly changes in a travel direction Y different from the travel direction X of the test wheel. A slide table moving positioning means for positioning the slide table; detecting that the test wheel has finished traveling on the specimen and is at a position away from the specimen; A slide table movement control signal generating circuit for randomly generating a movement position signal for each run of the test wheel and generating a slide table movement control signal based on the slide table movement position signal; and the slide table movement control; A pavement tracking test apparatus using a random traveling wheel load, comprising a slide table drive / control circuit for driving and controlling the slide table movement positioning means based on a signal. A slide table that holds a specimen that is similar in structure to the test paved road and that is viewed as the test paved road; a test wheel that travels on the test specimen as a vehicle wheel traveling on the paved road; A moving body to which the test wheel is mounted and a weight-adjustable load is applied; the test wheel is made to travel along the same linear locus in the traveling direction X, and the test wheel has finished running on the specimen, and from the specimen Test wheel travel means for repeatedly traveling in a range up to a distant position; and moving the slide table holding the specimen to a travel position that randomly changes in a travel direction Y different from the travel direction X of the test wheel. A slide table moving positioning means for positioning the slide table; detecting that the test wheel has finished traveling on the specimen and is in a position away from the specimen; A slide table movement position signal in which the movement position and the frequency of occurrence of the movement position follow a normal distribution characteristic is randomly generated for each run of the test wheel, and a slide table movement control signal is generated based on the slide table movement position signal. A pavement with a random traveling wheel load, comprising: a slide table movement control signal generation circuit to be generated; and a slide table drive / control circuit for driving and controlling the slide table movement positioning means based on the slide table movement control signal Tracking test equipment. One end of the connecting rod is pivotally supported at an eccentric position of the rotating body for driving the moving body, and the other end of the connecting rod is pivotally supported by the moving body. 7. A random traveling wheel according to claim 5 or 6, further comprising test wheel traveling means for reciprocally traveling in a range beyond the specimen and reaching a position away from the specimen. Pavement tracking test device by load.   A test wheel position detector that detects that the test wheel has finished traveling on the specimen and is at a position away from the specimen and generates a test wheel position signal; A random number generator that outputs a normal random number x every time the vehicle travels, and a slide table moving position signal y according to a normal distribution characteristic in which the moving position of the slide table and the frequency of occurrence of the moving position are randomly generated based on the normal random number x And a slide table movement control signal generation circuit including a slide table movement control signal calculation circuit for generating a slide table movement control signal c based on the slide table movement position signal y. A tracking test apparatus for pavement with a random traveling wheel load according to claim 5 or 6. The test specimen has a structure in which an asphalt pavement layer is laminated on a concrete floor slab with a waterproof membrane material interposed therebetween. Pavement tracking test equipment. The pavement tracking test apparatus according to any one of claims 5 to 8, wherein the traveling direction X of the test wheel and the moving direction Y of the specimen are orthogonal to each other. A slide table that holds a specimen that looks like a test paved road with the same quality as the test paved road, in which the asphalt pavement layer is laminated on the concrete floor slab with a waterproof membrane; traveling on the paved road A test wheel that travels on the specimen as if it were a vehicle wheel; a mobile body on which the test wheel is mounted and a weight-adjustable load is applied; and a mobile body that meshes with a transmission gear that is rotated by a drive motor One end of a connecting rod is pivotally supported at an eccentric position of the drive gear, and multiple ends of the connecting rod are pivotally supported by the movable body, and the test wheel is moved along the same linear locus in the traveling direction X. And a test wheel running means for reciprocating in a range from the specimen to a position away from the specimen; and a ball screw that is rotated by a servo motor is screwed to the slide table, A slide table movement positioning mechanism for positioning the slide table holding the specimen by moving it to a movement position in the movement direction Y orthogonal to the running direction X of the test wheel; and the test wheel traveling on the specimen A test wheel position detector that detects that the test wheel position signal is detected after being finished and is in a position away from the specimen, and receives the test wheel position signal and obtains a normal random number x for each run of the test wheel. A random number generator for outputting, a slide table movement position calculation circuit for randomly generating a slide table movement position signal y in which the movement position of the slide table and the frequency of occurrence of the movement position follow normal distribution characteristics based on the normal random number x, and A servo motor control signal calculation circuit for generating a control signal c of the servo motor based on the slide table movement position signal y Bomota control signal generating circuit and; the servo motor control signal pavement tracking test apparatus according to the random travel wheel load, characterized in that it comprises a servo motor drive and control circuit for driving the servo motor based to c.

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