JP5669315B2 - Surveying method and surveying device for uneven plane - Google Patents

Description

  The present invention relates to an uneven surface surveying method for measuring a change in the height direction of an uneven surface such as a road, and a surveying apparatus optimal for the implementation of this method.

  Conventionally, when preparing a repair plan for a road, a road with a high degree of unevenness due to wear or the like was selected and repaired with a road with a high asphalt surface. Also, when making a repair plan, the degree of unevenness was considered as a road section, and the amount of existing asphalt to be cut and the amount of asphalt to be newly laid were grasped.

  In this case, various methods for measuring uneven surfaces of roads have been proposed. For example, an apparatus for transmitting a laser beam to a road surface and receiving reflected light is loaded on the carriage, and the carriage is driven on a road to measure road surface unevenness information (for example, Patent Documents 1 to 3). 3).

  In another method, a device that emits one or a plurality of lasers is arranged on the side of the road, a laser is emitted from the laser transmitter toward the road surface, and the reflected light is received by some method. A method for acquiring road surface information has also been proposed (for example, Patent Documents 4 to 5).

JP 2001-221620 A JP 2004-325411 A JP2009-198382 JP 2005-106532 A JP-A-7-35522

  In the former method and apparatus of the prior art, since the apparatus is enlarged and the speed of the carriage is extremely slow compared with a vehicle traveling on the road, it is necessary to close the road when performing surveying. was there. Therefore, there are problems that require a great amount of labor, such as a regulation diagram necessary for application for regulation, preparation on site until surveying, and placement of guardman to regulate on site.

  Even in the latter method / device, since it is necessary to make the vehicle absent in a certain area on the road for a certain period of time, it is smaller than the former method, but vehicle regulation is still necessary. In addition, the range that can be processed by one laser transmitter is limited, it is necessary to move the laser transmitter frequently, and special processing is required to obtain uneven information from the received data, and the amount of data There was also a huge problem.

  Therefore, in the present invention, the plane position and height of the slave unit are set by transmitting the laser of the master unit to the prism of the slave unit that can move along the preset measurement line of the measurement plane and receiving it by the master unit. Since it can be easily obtained and can be grasped by the (X, Y, Z) data of the slave unit, the above-mentioned problems have been solved.

That is, the invention provides a method for measuring the unevenness of the road surface when planning repair plan of the road, the position is not blocking the traffic of the road as a reference point P _1, the reference point P ₁ And a slave unit that has a laser receiving and transmitting function and a slave unit that has a prism that is movable along a measurement line and that receives laser light from the master unit and returns it to the master unit. This is a method for measuring the height of an uneven surface, characterized in that it is configured as described above.
(1) Using the uneven surface to be measured as a measurement surface, a first measurement line is set at a position crossing the road. The slave sets the distance H ₀ from the measurement plane to the center of the prism constant. Further, a coordinate measurement interval T of the master unit is set.
(2) The slave unit is arranged at the initial position Q ₀ of the first measurement line, laser light is transmitted and received from the master unit to the prism of the slave unit, and the coordinate information of Q ₀ ( X ₀ , Y ₀ , Z ₀ ) are acquired and stored.
(3) without blocking the traffic of the road, and through the spaces of the car traffic moves along said handset to said first measurement line, the first movement position Q _1, from the base unit Laser light is transmitted to and received from the prism of the slave unit, and coordinate information (X ₁ , Y ₁ , Z ₁ ) of the first movement position Q ₁ is acquired and stored by the master unit. The moving speed of the slave is arbitrarily set during the measurement according to the measurement interval. Further, when the slave unit is moved, the measurement start position Q ₀ and the measurement end position Q are set so that each measurement line S can correspond to the measurement result when the road repair work is performed thereafter. Mark _n .
(4) Similarly, move the slave unit to the end point of the first measurement line, and similarly acquire coordinate information (X _n , Y _n , Z _n ) of the nth movement position Qn with the master unit. save.
(5) From Q ₀ (X ₀ , Y ₀ , Z ₀ ), Q ₁ (X ₁ , Y ₁ , Z ₁ ), ... Q _n (X _n , Y _n , Z _n ), the first A change in height of the measurement plane along the measurement line is displayed in a cross section along the first measurement line.

In the above, a method for measuring the height of an uneven surface is configured as follows.
(1) With respect to the measurement plane of the road, a number of measurement lines S are set at positions crossing the road,
(2) For each of the measurement lines S, mark the measurement start position Q ₀ and the measurement end position Q _n so that they can correspond to the measurement results when performing subsequent road repair work. Along with each measurement line, during the measurement, the moving speed of the slave unit is arbitrarily set according to the measurement interval, and the slave unit is moved.
(3) A plurality of measurement lines S ₁ , S ₂ ,... _Sn are set for one reference point P ₁ , and the coordinate information of the slave units is acquired for each measurement line S by the master unit. And save.
(4) A plurality of reference points P ₁ , P ₂ ,..., P _n whose plane positions and height positions are known are set, and the measurement lines S ₁ , S at all the reference points P are set. ₂ ,..., _Sn are set, and the coordinate information of the slave unit is acquired and stored by the master unit for each measurement line S.

The invention of the apparatus comprises a master unit installed at a reference point and having a laser receiving and transmitting function, and a slave unit having a prism that is movable and receives a laser beam from the master unit and returns it to the master unit. An apparatus for measuring the height of an uneven surface, characterized in that it is configured as follows.
(1) The uneven surface to be measured is the measurement surface.
(2) The master unit emits a laser beam toward the prism of the slave unit, receives the reflected laser beam, measures the plane position and height position of the current position of the slave unit, and coordinates It has a function of acquiring and storing information (X, Y, Z).
(3) The slave has a base, and the base is provided with two wheels that can move along the unevenness on the measurement plane, and the wheels are attached to both sides of the axle.
(4) The slave unit is arranged such that the prism is attached to the upper surface of the base body, maintaining a certain height H ₀ from the ground contact position of the wheel, and the prism is positioned directly above the axle.
(5) In the slave unit, an operation rod for operating the movement is fixed to the base body in an obliquely upward direction.

The storage of the coordinate information from the slave unit in the above can be any of the following (a) and (b).
(A) When storing the coordinate information (X, Y, Z) from the slave unit as it is.
(A) Height H ₀ from the measurement surface to the prism, the plane position of the reference point (that is, the plane position of the laser transmission / reception part of the master unit), and the height position (that is, the height position of the laser transmission / reception part of the master unit) ) When the distance to the measurement line needs to be corrected, and the coordinate information (X, Y, Z) from the slave unit is corrected and stored.

If the concave / convex plane is a road, the cross section can be displayed by measuring the height along the measurement line along which the slave has moved, at least as long as the slave has enough time to cross the road. Therefore, there is an effect that the measurement can be performed while passing through the gap of traffic of the vehicle without blocking the road traffic.
In addition, since the plane position and height of the slave unit can be grasped by (X, Y, Z) data, data processing can be performed with a simple and small amount of data, so it is simple but accurate and in a short time. It has the effect of being able to survey uneven surfaces such as road unevenness.

FIG. 1 is a handset used for carrying out the present invention, in which (a) is a side view with a part cut away, and (b) is a front view. FIG. 2 is a perspective view of the master unit used for carrying out the present invention. FIG. 3 is a partial cross-sectional view of a road measured by the present invention. FIG. 4 is a schematic plan view for explaining the measurement method of the present invention.

(1) The subunit | mobile_unit 10 attaches and comprises the 360 degree prism 7 on the upper surface of the base | substrate 1 which can move with the wheel 5. FIG. The wheel 5 is configured by providing two wheels on both sides of the axle 4, and the center 8 of the prism 7 is located immediately above the axle 4. An operating rod 11 for operating the travel of the slave unit 10 is provided on the base 1 (FIG. 1).

(2) The master unit 20 has a main body 22 that can freely rotate in a horizontal plane and a vertical plane, and the main body 22 is provided with a lens unit that can receive and transmit a laser. The laser emitted from the lens unit 22 of the master unit 20 is reflected by the center 8 of the prism 7 of the slave unit 10 and can be received by the lens unit 23 again.

(3) The master unit 20 is placed at the reference point P, and the slave unit 10 is caused to travel along the measurement line S to be surveyed. At a measurement point on the measurement line S, a laser is transmitted and received from the master unit 20 toward the slave unit 10, and the plane position of the slave unit 10 (that is, the plane position of the center 8 of the prism 7 of the slave unit 10), The height information of the child device 10 (that is, the height of the center 8 of the prism 7 of the child device 10) can be acquired using the position information of the child device 10 as coordinates (X, Y, Z). If the coordinate information (X, Y, Z) of the slave unit is similarly obtained at a large number of measurement points along the measurement line, the cross section (plane position and height) along the measurement line S can be surveyed.

(4) By setting a large number of measurement lines S that cross the road to be surveyed, it is possible to survey the unevenness and wear state of the road surface over the entire length of the road. Further, the uneven plane can be applied to any plane such as an airfield or various stadiums, but is particularly effective for surveying in a place with a lot of traffic such as a road.

  Embodiments of the present invention will be described with reference to the drawings.

1. Configuration of measuring device

  The measuring device is composed of a slave unit 10 and a master unit 20 as follows.

(1) Configuration of handset 10

A base body 1 shaped like a horizontal cylinder has an axle 4 that is horizontal in the axial direction of the cylinder, and wheels 5 and 5 are provided at both ends of the axle 4. The base body 1 has a flat surface portion 2 on the upper surface, and an attachment hole 3 for attaching the prism 7 to the flat surface portion 2 is formed. Further, the operation rod 11 for operating the movement of the base body 1 is fixed to the base body 1 obliquely upward.
The prism 7 is a so-called 360 ° prism, and has a function of guiding laser light incident on the prism 7 from an arbitrary direction to the center 8 of the prism 7 and reflecting the laser light in the incident direction. Moreover, it has the protrusion part 9 for attachment toward the lower end at the lower end. The protrusion 9 of the prism 7 is inserted into the mounting hole 3 of the base 1 and the prism 7 is detachably attached to the base 1 to obtain the handset 10 of the present invention. In this case, the positions of the prism 7 and the axle 4 are set so that the center 8 of the prism 7 is located immediately above the axle 4 (FIG. 1A).
Further, the distance from the ground 31 (the ground contact point of the wheel 5) to the center 8 of the prism 7 is H ₀ (FIG. 1A).

(2) Configuration of base unit 20

The main unit 20 has a main body portion 22 having a lens portion 23 that receives and transmits a laser beam on a main body column portion 21 so as to be rotatable in a horizontal plane and rotatable in a vertical plane (angle changeable). The main body 22 has a function of sensing the prism 7 of the slave unit 10 and tracking the slave unit 10 so that the lens unit 23 always faces the prism 7 (FIG. 2). In the figure, 24 and 24 are operation panels for performing various settings of the master unit 20, and two are provided at diagonal positions (diameter targets) with respect to the vertical axis.
The parent device 20 has a function of measuring the position of the child device 10 and storing data using the position information of the child device as coordinates Q _n (X _n , Y _n , Z _n ). Data can be taken out via various recording media, and data can be transferred to a predetermined PC or the like by a communication function.
For example, a “TPS1200 + series” of “Leica” is used as the parent device 20 and a 360 ° prism, which is an accessory product of the same device, is adopted as the prism 7 of the child device. In the case of this device, since the reach distance can be about 500 to 800 m, if the road has no shielding, at least 500 m on both sides of the reference point P where the base unit 20 is installed can be measured in total about 1000 m. When the measurement lines S are set at intervals of 50 m, about 200 road sections can be surveyed. In addition, as for the main | base station 20, it cannot be overemphasized that the other model which can exhibit the same function as well as the said model, or the product of another company can be used.

2. Measurement method (1)-Measurement plan

(1) For example, by measuring the unevenness of the surface of the road 32, the degree of wear of the road 32 is determined. If the amount of wear is large, asphalt repair is performed. For example, when information on the presence / absence of rutting (road wear due to car tires) is required, the interval T between the measurement points S is set to about 10 cm, for example.

(2) A position to be measured is set as a measurement line S across the road 32 to be measured in advance on the map for each interval L. For example, it is set at L = 50 m.
Setting the reference point P ₁ having jurisdiction over the plurality of measurement lines S. At the reference point P ₁ , the master unit 20 is installed, and a laser is transmitted to the slave unit 10 traveling on each measurement line S under its control and received. When the base unit 20 is moved, it is necessary to set various settings again. Therefore, it is desirable to reduce the movement of the base unit 20. An obstacle 38 such as a high median strip or a tree between the lens unit 23 for receiving and transmitting the laser of the master unit 20 and the prism 7 of the slave unit 10 (moving along the measurement line S). Is set arbitrarily within the range of the reach in terms of the laser performance of the master unit 20, avoiding the position that becomes a blind spot. Even if there are some obstructions between the parent device 20 and the child device 10, the child device 10 moves at a constant speed, so the parent device 20 tracks the movement of the child device 10 in anticipation of the movement. Therefore, if there is no obstacle at the measurement point, it can be measured.

(3) Further, the coordinate measurement interval T is set in the parent device 20. For example, when obtaining data for each T = 10 cm ₂ on the measurement line S ₁ , “2 km / hour” (about 2 km / hour) in which the moving speed of the handset 10 is slower than the average walking speed (4 km / hour) of the person. 55.6 cm / second), taking this into consideration, the measurement interval (laser transmission interval) of the master unit 20 may be set to about 0.2 seconds. Further, the master unit 20 can be set by directly inputting the value of T, which is a measurement pitch, as “10 m”.

2. Measurement method (2)-Measurement of one measurement line

(1) On the road 32 at the measurement site, a section line whose cross section (height) needs to be measured is set as a measurement line S for each interval L based on the measurement plan. In order to perform the measurement on each measurement line S, the position of the master unit 20 is determined (so that the laser beam from the master unit 20 can be received), and the reference points P ₁ , P ₂ ,. _n is determined.
Therefore, the measurement lines S ₁ , S ₂ ,..., _Sn are set for each reference point P, and the measurement start position Q ₀ and the measurement end position Q _n are determined by each measurement line S.

(2) Next, at the measurement site, the master unit 20 is installed by marking the positions of the reference points P ₁ , P ₂ ,... P _n on the road. Further, for each measurement line S, the measurement start position Q ₀ and the measurement end position Q _n are marked. Sign of the measurement start position Q ₀ and the measurement end position Q _n, at the time of the subsequent road repair work, the survey results may be made to correspond.

(3) to the reference point _{P 1} by installing the base unit 20, placing the slave unit 10 in the first measurement start position _{Q 0} of the measuring line _{S 1.}
The master unit 20 is switched on and tracking of the slave unit 10 is started. The base unit 20 applies a laser to the prism 7 of the slave unit 10, receives the reflected light by the base unit 20, and coordinates information of the initial position Q ₀ of the first measurement line S ₁ of the reference point P ₁ ,
Coordinate Q _1-0 (X _1-0 , Y _1-0 , Z _1-0 )
Therefore, the base unit 20 sets and saves it.
Subsequently, the measurer holds the operation rod 11 of the slave unit 10 and walks toward the measurement end point Q _n of the set first measurement line S ₁ at the set speed (about 2 km / hour). The machine 10 is moved. At this time, if a target is set at an intermediate position (between Q ₀ and Q _n ) of the first measurement line S ₁ and walking, measurement along the first measurement line can be performed. During this time, the position of the slave unit 10 is tracked from the master unit 20.

(4) Subsequently, the first movement position of the mobile device 10, i.e. to obtain a received light by transmitting the laser from the base unit 20 from the Q ₀ after about 0.2 seconds, the coordinates information at the first movement position,
Coordinate Q _1-1 (X _1-1 , Y _1-1 , Z _1-1 )
Therefore, the base unit 20 sets and saves it. Similarly,
Coordinates _Q1-2 ( _X1-2 , _Y1-2 , _Z1-2 )
Coordinates _Q1-3 ( _X1-3 , _Y1-3 , _Z1-3 )
Coordinates Q _1-4 (X _1-4 , Y _1-4 , Z _1-4 )
...
Coordinate Q1 _-n (X1 _-n , Y1 _-n , Z1 _-n )
Thus, to give up data in Q _n, the master unit 20, and stores the set all this (Figure 4 (b)).

(5) In this case, the vehicle travels at a constant speed (predetermined) close to a preset speed (in this case, 2 km / hour), and the operator does not enter between the master unit and the slave unit. warn. However, since the coordinate information of the height position corresponding to the plane position of the slave unit can be obtained even if the speed is slightly changed, there is no problem in the measurement of the cross section of the measurement line.
Further, when the operator operates the slave unit 10, the slave unit 10 has two wheels 5 and 5, so that the vertical direction (the ground contact surface 31 and the height direction) does not fluctuate. The same is true for the four axial directions. Therefore, care should be taken so that the prism 7 does not tilt in the traveling direction (the direction of the measurement line S, the direction perpendicular to the axle 4). However, for example, if the inclination of the prism 7 is shifted by 5 °, if the height (= H ₀ ) of the center 8 of the prism 7 to the contact surface 31 is 30 cm, the horizontal shift is about 2.61 cm, since the up-and-down direction of the deviation is only about 0.11 cm, also Ri is the gradient of the pavement in the normal road Oh, great influence is not on this measurement.
Also, for example, in the case of a four-lane road (width 10 m), even if the travel speed of the slave is 2 km / h, it can be crossed in about 18 seconds. You can survey without having to. In addition, the walking speed (the moving speed of the slave unit 10 along the measurement line) can be increased, and the road crossing time can be further shortened.

(6) As described above, when the walking speed (2 km / hour) and the measurement interval are set in T (= 10 cm) time, when the measurement interval T is set to 10 cm and every 5 cm, the parent Without changing the setting of the machine 20, the moving speed (walking speed) of the child machine 10 can be halved. Moreover, when there is little change in the cross section of the road and it is desired to set the measurement interval to 50 cm, the moving speed (walking speed) may be increased by about 5 times and can be arbitrarily set. In particular, when an abnormal part is found during measurement and measurement of a fine cross section is desired, it is possible to cope with it only by slowing the moving speed of the slave unit 10, which is effective.

4). Measurement method (3)-Surveying the entire road

(1) Once the first exit measurement line _{S 1,} to move the slave unit 10 to the measurement starting position _{Q 0} of the second measurement line _{S 2} in the same manner. In this case, since the handset 10 is being tracked from the base unit 20, the measurement on the second measurement line S2 can be started immediately. In the same manner, along a second measurement line S _2, by moving the handset 10, measured (Figure 4 (a)).
Coordinate Q _2-0 (X _2-0 , Y _2-0 , Z _2-0 )
Coordinate Q _2-1 (X _2-1 , Y _2-1 , Z _2-1 )
Coordinate Q _2-2 (X _2-2 , Y _2-2 , Z _2-2 )
...
Coordinate Q _2-n (X _2-n , Y _2-n , Z _2-n )

(2) The start position of the first measurement line can be started by setting the measurement end position side of the first measurement line, that is, the Q _2-n side as Q _2-0 (FIG. 4A). In this case, the number of times of crossing the road can be reduced.

(3) Similarly, data of all the n measurement lines S ₁ , S ₂ ,..., S _{n to be} measured is acquired at one reference point P ₁ .
Coordinate Qn _-0 ( _Xn-0 , Yn _-0 , Zn _-0 )
Coordinate Qn _-1 ( _Xn-1 , Yn _-1 , Zn _-1 )
Coordinate Qn _-2 ( _Xn-2 , Yn _-2 , Zn _-2 )
...
Coordinates Q _n-n (X _n-n , Y _n-n , Z _n-n )

(4) Next, the base unit 20 is moved to the second reference point P ₂ , the third reference point P ₃ ,..., The nth reference point P _n , and the measurement line is measured for each reference point P in the same manner. The slave unit 10 is moved along S, and data is acquired in the same manner. When moving the reference point P, the planar position and height position of the first reference point P ₁ to obtain, corrects the coordinate information of each measurement line S.

(5) Since each piece of data obtained as described above is a set of ternary coordinate data, it can be processed with general-purpose processing software, can easily create cross-sectional views, and has a very small amount of data. The processing time can be shortened for easy processing. Therefore, it is easy to increase the number of measurement points on one measurement line, or increase the number of measurement lines, and it is possible to obtain finer road unevenness information very easily.
For example, if S ₁ at the reference point P ₁ is a road, such as 3, it can easily grasp the presence of a smooth concave height several mm "rut 33". Further, the position of the line 35a, the water collecting basin 36, the manhole 37, etc. of the street lantern 35 can also be grasped by information from the handset 10 (FIG. 3).

(6) Further, if a worker having a remote control for operating the master unit operates the slave unit, even one worker can perform the measurement work. In addition, if a cord or the like is stretched along the measurement line and the slave unit is moved along the string or the like, it is possible to prevent the displacement of the planar position from the measurement line.

(7) In addition, in the above, considering the repair work, it is desirable that the measurement lines S ₁ , S ₂ ,... S _n are arranged in parallel to cross the road. It can also be set to cross the road or in the length direction of the road (not shown). In addition, the measurement line S is not limited to a straight line, and can be a curved line such as an arc or a wave, and can be a zigzag type.
In particular, the measurement line S can be set in various ways, for example, at branches, merges, intersections, and the like. Regardless of which measurement line is set, the uneven surface of the road can be measured accurately and easily.

5. Other examples

(1) In the said Example, although the wheel 5 of the subunit | mobile_unit 10 was provided, it can also be set as three or four or more (not shown). With two wheels, it is necessary to pay some attention to the inclination of the prism 7 in the traveling direction, but with three or more wheels, it is not necessary to consider the inclination of the prism 7, but the plane position of the center 8 of the prism 7 is Since there is a slight shift in the contact position 5, a slight error may occur in the plane position of the center 8 of the prism 7 when there is a sudden height change. Therefore, in order to eliminate the error, it is necessary to devise such as installing a prism above one axle.

(2) Moreover, in the said Example, when the wheel 5 of the subunit | mobile_unit 10 is made into 3 or 4 or more, it can also comprise so that a power apparatus (an engine or a motor) may be attached to the subunit | mobile_unit 10, and it may drive | work automatically. Possible (not shown).

(3) Moreover, in the said Example, although the base | substrate 1 of the subunit | mobile_unit 10 was made into the structure where the cylinder was installed horizontally, if two or more wheels 5 and 5 and the prism 7 can be attached, of base | substrate 1 The structure is arbitrary (not shown).

1 Base (child machine)
4 axles (slave unit)
5 wheels (child machine)
7 Prism (child unit)
8 The center of the prism (slave unit)
10 Handset 11 Operation stick (Handset)
20 Main machine 21 Main body pillar part 22 Main part part 23 Lens part 24 Operation panel 25 Tripod 31 Ground 32 Road 33 Waddle 34 Curb 35 Street 35a Street 35 Line Catch 37 Manhole (Human hole)
38 Obstacle

Claims (3)

A method for measuring the unevenness of the road surface when planning repair plan of the road, as a reference point P ₁ a position where there is no blocking traffic of the road, installed in the laser received by the reference point P ₁ Using a master unit having a transmission function and a slave unit having a prism that is movable along a measurement line and receives a laser beam from the master unit and returns it to the master unit, the configuration is as follows: A method for measuring the height of an uneven surface, characterized by:
(1) Using the uneven surface to be measured as a measurement surface, a first measurement line is set at a position crossing the road. The slave sets the distance H ₀ from the measurement plane to the center of the prism constant. Further, a coordinate measurement interval T of the master unit is set.
(2) The slave unit is arranged at the initial position Q ₀ of the first measurement line, laser light is transmitted and received from the master unit to the prism of the slave unit, and the coordinate information of Q ₀ ( X ₀ , Y ₀ , Z ₀ ) are acquired and stored.
(3) without blocking the traffic of the road, and through the spaces of the car traffic moves along said handset to said first measurement line, the first movement position Q _1, from the base unit Laser light is transmitted to and received from the prism of the slave unit, and coordinate information (X ₁ , Y ₁ , Z ₁ ) of the first movement position Q ₁ is acquired and stored by the master unit. The moving speed of the slave is arbitrarily set during the measurement according to the measurement interval. Further, when the slave unit is moved, the measurement start position Q ₀ and the measurement end position Q are set so that each measurement line S can correspond to the measurement result when the road repair work is performed thereafter. Mark _n .
(4) Similarly, move the slave unit to the end point of the first measurement line, and similarly acquire coordinate information (X _n , Y _n , Z _n ) of the nth movement position Qn with the master unit. save.
(5) From Q ₀ (X ₀ , Y ₀ , Z ₀ ), Q ₁ (X ₁ , Y ₁ , Z ₁ ), ... Q _n (X _n , Y _n , Z _n ), the first A change in height of the measurement plane along the measurement line is displayed in a cross section along the first measurement line. The method for measuring the height of a concavo-convex plane according to claim 1, wherein the method is configured as follows.
(1) With respect to the measurement plane of the road, a number of measurement lines S are set at positions crossing the road,
(2) For each of the measurement lines S, mark the measurement start position Q ₀ and the measurement end position Q _n so that they can correspond to the measurement results when performing subsequent road repair work. Along with each measurement line, during the measurement, the moving speed of the slave unit is arbitrarily set according to the measurement interval, and the slave unit is moved.
(3) A plurality of measurement lines S ₁ , S ₂ ,... _Sn are set for one reference point P ₁ , and the coordinate information of the slave units is acquired for each measurement line S by the master unit. And save.
(4) A plurality of reference points P ₁ , P ₂ ,..., P _n whose plane positions and height positions are known are set, and the measurement lines S ₁ , S at all the reference points P are set. ₂ ,..., _Sn are set, and the coordinate information of the slave unit is acquired and stored by the master unit for each measurement line S. It consists of a master unit installed at a reference point and having a laser receiving / transmitting function, and a slave unit having a prism that is movable and receives a laser beam from the master unit and returns it to the master unit. An apparatus for measuring the height of an uneven surface, characterized in that.
(1) The uneven surface to be measured is the measurement surface.
(2) The master unit emits a laser beam toward the prism of the slave unit, receives the reflected laser beam, measures the plane position and height position of the current position of the slave unit, and coordinates It has a function of acquiring and storing information (X, Y, Z).
(3) The slave has a base, and the base is provided with two wheels that can move along the unevenness on the measurement plane, and the wheels are attached to both sides of the axle.
(4) The slave unit is arranged such that the prism is attached to the upper surface of the base body, maintaining a certain height H ₀ from the ground contact position of the wheel, and the prism is positioned directly above the axle.
(5) In the slave unit, an operation rod for operating the movement is fixed to the base body in an obliquely upward direction.

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