JP2014137329A - System and method for measuring plumbing error of plumbing member and method for plumbing reversely driven column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate an installation work of a device used for measuring a plumbing error of a plumbing member such as a reversely driven column and the like.SOLUTION: A system 10 measures a plumbing error of a reversely driven column 10 plumbed in a ground based on a target 50 provided inside a guide pipe 20, and includes: a camera 110 installed so as to image a target 50; an inclinometer 120 for measuring an inclination of the camera 110; and a computer 130 for extracting a position of the target 50 based on imaging information of the camera 110, calculating an inclination angle for a vertical axis of an optical axis 112 of the camera 110 based on the measurement value of the inclinometer 120, and correcting the position of the target 50 based on the calculated inclination angle.

Description

  The present invention relates to a measuring system, a measuring method, and a erection method for a back strut which measure an erection error of a erection member erected in the ground or underwater.

  When constructing an underground structure of a building by the reverse driving method, a reverse strut for supporting the load of the building frame is buried in the ground before excavating the ground. When this erection error occurs, it is important to ensure erection accuracy when embedding the erection column.

  For this reason, the back struts are erected while measuring the error. For example, a guide tube is attached to the outer periphery of the back struts, a mark is given to the inside, and a laser vertical device is placed above the guide tubes. Is installed, and the erection error of the striking strut is measured based on the positional relationship between the mark and the laser beam (see, for example, Patent Document 1).

JP 2011-214307 A

  However, in the measurement method described in Patent Document 1, it is necessary to install the laser vertical device horizontally (so that the optical axis of the laser is vertical) with high accuracy, and high-level work is required. In addition, when the erection posture of the back strut is corrected, the horizontality of the laser vertical tool is lost, so that the erection error cannot be measured while correcting the erection posture of the counter strut.

  The present invention has been made in view of the above problems, and facilitates the installation work of the device used for measuring the erection error of the erection member such as the back strut and the erection posture of the erection member. It is an object to enable measurement of erection error while correcting.

  The system for measuring an erection error of an erection member according to the present invention is such that an erection error of an erection member that is erected so as to extend in the vertical direction on the ground or in water extends to the erection member in the vertical direction. A system for measuring based on the position of an index provided inside a tube attached to the camera, the camera installed to photograph the index above the tube, and measuring the tilt of the camera An inclination meter, an index position extraction unit that extracts a position of the index based on imaging information of the camera, and an inclination angle of the optical axis of the camera with respect to a vertical axis based on a measurement value of the inclinometer, An index position correction unit that corrects the position of the index extracted by the index position extraction unit based on the calculated inclination angle.

  In the erection error measurement system of the erection member, the index position correction unit is configured to determine the inclination corresponding to the measurement value of the inclinometer from a relational expression indicating a relationship between the measurement value of the inclinometer and the inclination angle. An angle may be calculated.

  Moreover, the measuring method of the erection error of the erection member according to the present invention is that the erection error of the erection member that is erected so as to extend in the vertical direction in the ground or water is given to the erection member in the vertical direction. A method of measuring based on the position of an index provided inside a tubular body attached so as to extend, wherein the camera and an inclinometer for measuring the tilt of the camera are installed above the tubular body. The step of photographing the index, the step of extracting the position of the index based on the imaging information of the camera, and the tilt angle of the optical axis of the camera with respect to the vertical axis based on the measured value of the inclinometer And a step of correcting the extracted position of the index based on the calculated inclination angle.

  In the method of measuring the erection error of the erection member, the step of calculating the inclination angle corresponds to the measurement value of the inclinometer from the relational expression indicating the relationship between the measurement value of the inclinometer and the inclination angle. The tilt angle may be calculated.

  The method for measuring the erection error of the erection member may include a step for obtaining the relational expression. In this step, a camera and the inclinometer are installed above the tubular body, and the camera A first step of photographing an index and extracting a position coordinate of the index based on imaging information of the camera; and rotating the camera and the inclinometer around the vertical axis by 180 ° about the camera, The second step of photographing the index and extracting the position coordinates of the index based on the imaging information of the camera, and the average value of the position coordinates of the index extracted in the first step and the second step Performing a third step of calculating a plurality of times and a fourth step of calculating the tilt angle in the first step based on the average value calculated in the third step; Measurements of the swash meter and may be determined linear equations with the inclination angle.

  Further, the erection method of the striking strut according to the present invention is a method of laying the striking strut on the ground, and the pipe body in which an index is provided so as to extend in the vertical direction of the striking strut. Mounting a camera and an inclinometer for measuring the tilt of the camera above the tubular body, placing the back strut on the ground, photographing the index with the camera, and imaging information of the camera Extracting the position of the indicator based on the step, calculating the tilt angle of the optical axis of the camera with respect to the vertical axis based on the measured value of the inclinometer, and calculating the position of the extracted indicator A step of correcting based on the inclination angle; a step of calculating an erection error of the counter-strut post based on the corrected position of the index; and the counter-strike so that the calculated erection error is reduced. And a step of modifying the construction put attitude of the pillars.

  According to the present invention, it is easy to install a device used for measuring the erection error of a erection member such as a back-strut strut and measure the erection error while correcting the erection posture of the erection member. Is possible.

It is a figure which shows the upper side of the striking strut built in the ground. It is a figure which shows the lower side of the reverse strike support | pillar built in the ground. It is a figure which shows the outline of the measurement system of an erection error. It is a block diagram which shows schematic structure of a computer. It is a figure which shows the relationship between inclination-angle ((beta) x, (beta) y), a position coordinate (Xt, Yt), and a position coordinate (Xr, Yr). It is a graph which shows the relationship between the measurement data ((alpha) x, (alpha) y) of an inclinometer, and the inclination angle ((beta) x, (beta) y) of a camera. It is a flowchart which shows the procedure which calculates | requires following (1) Formula. It is a figure for demonstrating the procedure which calculates | requires the following (1) Formula. It is a flowchart which shows the procedure which measures the erection error (Xr, Yr) of the reverse strut. It is a flowchart for demonstrating the calculation process of the position coordinate (Xr, Tr) by a computer. (A)-(E) is a figure which shows the operation | work procedure which builds a back strut strut. It is a figure which shows the operation | work procedure which installs a reverse strut. It is a flowchart for demonstrating the procedure which corrects the erection attitude | position of the back strut 10.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a diagram showing the upper side of the counter strut 10 built in the ground, and FIG. 1B is a diagram showing the lower side of the counter strut 10 built in the ground. As shown in these figures, the upper portion of the counter strut 10 is formed of a steel pipe having a rectangular cross section, and most of the lower side thereof is formed of a so-called cross H-section steel. A stud 12 is driven at the lower end portion of the reverse strut 10, and a part of the lower side including this portion is embedded in the reinforced concrete pile 1. A Yatco 104 is installed on the head of the counter strut 10. The YATCO 104 is a steel pipe having the same cross-sectional shape and dimensions as the steel pipe portion of the counter strut 10 and is arranged coaxially with the counter strut 10 so that the square and the four sides overlap each other.

  A guide tube 20 is attached to the counter strut 10 so as to extend along the axial direction thereof. The guide tube 20 is a square steel tube that extends from the upper end of the Yatco 104 to the vicinity of the head of the pile 1, and is fixed to the Yatco 104 and the counter strut 10 through the bracket 22. In addition, a plate-like target 50 used for measuring the erection error of the back strut 10 is attached to the lower end of the guide tube 20 (see FIG. 2).

  FIG. 2 is a diagram showing an outline of the erection error measurement system 100. As shown in this figure, the erection error measurement system 100 includes a measurement unit 101 installed in the YATCO 104 and a computer 130. The measurement unit 101 is attached to the side surface of the YATCO 104 via the installation table 108, the camera 110 and the inclinometer 120 installed on the plate 102, and attached to the side surface of the YATCO 104 via the installation table 108. The illumination 106 is provided. As shown in the enlarged view in the drawing, a circular reflecting mirror 51 is attached to the upper surface of the target 50, and the center of the reflecting mirror 51 is the core (center axis) of the guide tube 20. It is arranged so as to coincide with the position through which 21 passes.

  A plate with a reference line is provided on the upper side of the installation table 108, and the plate 102 is installed on the upper side of the installation table 108 according to the reference line. In addition, an opening through which the core of the guide tube 20 passes is formed in the plate 102, and the camera 110 is installed downward so that the optical axis 112 passes through the opening. That is, the camera 110 is installed so as to photograph the reflecting mirror 51 of the target 50. The illumination 106 is arranged to illuminate the inside of the guide tube 20 below the camera 110.

  The inclinometer 120 is a strain gauge type inclinometer that is usually used to measure the inclination of the ground, and the inclination angle αx in two directions (X direction and Y direction) orthogonal to the horizontal plane of the installation surface (plate 102). , Αy is measured.

  The computer 130 is connected to the camera 110 and the inclinometer 120 in a wired or wireless manner, and receives imaging data of the camera 110 and measurement data of the inclinometer 120. Further, the computer 130 is installed with a program for executing a process of calculating the erection error of the back strut 10 based on the image data of the camera 110 and the measurement value of the inclinometer 120.

  FIG. 3 is a block diagram illustrating a schematic configuration of the computer 130. As shown in this figure, the computer 130 includes a CPU 132, a memory 134, an interface 136, and a monitor 138. The CPU 132 includes a position coordinate extraction unit 132A and a position coordinate correction unit 132B. The interface 136 inputs imaging data output from the camera 110 and measurement data (αx, αy) output from the inclinometer 120. The memory 134 stores a program for extracting a position coordinate (Xt, Yt) of the center point of the reflecting mirror 51 and correcting the value, and the CPU 132 performs processing according to the program. And the calculated value is displayed on the monitor 138.

  The position coordinate extraction unit 132A extracts the position coordinates (Xt, Yt) of the center point of the reflecting mirror 51 based on the imaging data input by the interface 136. The origin of this coordinate system is the intersection of the height surface of the reflecting mirror 51 and the optical axis 112. Then, the position coordinate correcting unit 132B corrects the position coordinates (Xt, Yt) based on the measurement data (αx, αy) of the inclinometer 120, and the actual (that is, the camera 110 is accurately leveled (optical axis 112)). Position coordinates (Xr, Yr) are calculated.

Here, the position coordinate correction unit 132 </ b> B is based on the relational expression (equation (1) below) between the measurement data (αx, αy) of the inclinometer 120 and the inclination angle (βx, βy) of the camera 110. The inclination angle (βx, βy) is calculated, and based on the relational expression (the following expression (2)) between the inclination angle (βx, βy), the position coordinate (Xt, Yt), and the position coordinate (Xr, Yr) Coordinates (Xr, Yr) are calculated. Note that ax, bx, ay, by, and L will be described later.
(Βx, βy) = (ax · αx + bx, ay · αy + by) (1)
(Xr, Yr) = (Xt + Lsin βx, Yt + Lsin βy) (2)

  Hereinafter, the relationship between the measurement data (αx, αy) of the inclinometer 120 and the tilt angle (βx, βy) of the camera 110, the tilt angle (βx, βy), the position coordinate (Xt, Yt), and the position coordinate (Xr) , Yr).

  FIG. 4 is a diagram illustrating a relationship among the tilt angle (βx, βy), the position coordinates (Xt, Yt), and the position coordinates (Xr, Yr). Although FIG. 4 shows only the X direction, the same applies to the Y direction. As shown on the left side of FIG. 4, when the tilt angle (βx, βy) of the camera 110 is (0, 0), the core of the guide tube 20 when the back strut 10 is correctly erected. 21 and the optical axis 112 coincide with each other, the actual position coordinates (Xr, Yr) of the target 50 coincide with the position coordinates (Xt, Yt) in the captured image 114 of the camera 110.

  On the other hand, as shown on the right side of FIG. 4, when the optical axis 112 of the camera 110 is inclined relative to the core 21 of the guide tube 20, the actual position coordinates (Xr, Yr) of the target 50 and The position coordinate (Xt, Yt) in the captured image 114 of the camera 110 deviates, and the relationship of the above equation (2) is obtained. Note that L is the distance from the camera 110 to the target 50.

  FIG. 5 is a graph showing the relationship between the measurement data (αx, αy) of the inclinometer 120 and the inclination angle (βx, βy) of the camera 110. This graph shows only αx and βx values in the X direction, but the same applies to αy and βy values in the Y direction. As shown in this graph, the measurement capacity of the inclinometer 120 is ± α ′ ° (for example, ± 1 to 5 °), and in that range, the resistance change amount of the strain gauge of the inclinometer 120 and the measured values (αx, αy). ), The linearity as shown in the above equation (1) is also established in the measurement data (αx, αy) of the inclinometer 120 and the inclination angle (βx, βy) of the camera 110. can do.

  FIG. 6 is a flowchart showing a procedure for obtaining the equation (1), and FIG. 7 is a diagram for explaining a procedure for obtaining the equation (1). First, as shown on the left side of FIG. 7, the measurement unit 101 is installed on the installation table 108 (step 1). The position where the measurement unit 101 is installed in this step is the installation position when measuring the erection error. Next, the target 110 is imaged with the camera 110 (step 2). In this step, the position coordinate extraction unit 132A extracts the position coordinates (Xt1, Yt1).

  Next, as shown on the right side of FIG. 7, the measurement unit 101 is rotated 180 ° around the vertical axis about the optical axis 112 of the camera 110 and installed on the installation table 108 along the reference line (step 3). ). Next, the target 110 is imaged with the camera 110 (step 4). In this step, the position coordinate extraction unit 132A extracts the position coordinates (Xt2, Yt2).

Next, actual position coordinates (Xr, Yr) are calculated from the following equation (3) (step 5). Here, when the tilt angle of the camera 110 in steps 1 and 2 is (βx1, βy1), the tilt angle of the camera 110 in steps 3 and 4 is (−βx1, −βy1), and extracted in step 2. By calculating the average value of the position coordinates (Xt1, Yt1) and the position coordinates (Xt2, Yt2) extracted in step 4, the actual position coordinates (Xr, Yr) can be obtained.
(Xr, Yr) = ((Xt1-Xt2) / 2, (Yt1-Yt2) / 2) (3)

  Next, the tilt angle (βx1, βy1) of the camera 110 is calculated by substituting the position coordinates (Xr, Yr) calculated in step 5 into the equation (2) (step 6).

  Then, by executing Steps 1 to 6 again, the inclination angle (βx2, βy2) at the time of installing the second measurement unit 101 is obtained (Step 7).

Here, when the tilt angle (βx, βy) of the camera 110 is (βx1, βy1), the measurement data of the inclinometer 120 is (αx1, αx1), and the tilt angle (βx, βy) of the camera 110 is (βx2). , Βy2), the measurement data of the inclinometer 120 is assumed to be (αx2, αx2), and ax, bx, ay, and by the above equation (1) are calculated (step 8).
ax = (βx1-βx2) / (αx1-αx2)
bx = (αx1, βx2-αx2, βx1) / (αx1-αx2)
ay = (βy1-βy2) / (αy1-αy2)
by = (αy1 · βy2-αy2 · βy1) / (αy1-αy2)

  A program including a relational expression (the above expression (1)) between the tilt angle (βx, βy) of the camera 110 and the measured value (αx, αy) of the inclinometer 120 obtained as described above is stored in the memory 134. The CPU 132 calculates actual position coordinates (Xr, Yr) according to the program.

  FIG. 8 is a flowchart showing a procedure for measuring the erection error (Xr, Yr) of the back strut 10. As shown in this flowchart, first, the distance L between the camera 110 and the target 50 is input to the computer 130 (step 11). Next, the measurement unit 101 is installed on the installation table 108 according to the reference line (step 12). Next, the target 110 is imaged with the camera 110 (step 13).

  FIG. 9 is a flowchart for explaining the calculation process of the position coordinates (Xr, Tr) by the computer 130. As shown in this flowchart, when the target 50 is imaged by the camera 110, the position coordinate extraction unit 132A extracts the position coordinates (Xt, Yt) from the imaging data (step 131). Then, the position coordinate correcting unit 132B calculates the tilt angle (βx, βy) of the camera 110 from the measured values (αx, αy) of the inclinometer 120 by the above formula (1), and the position coordinates (Xt, Yt), tilt Based on the angle (βx, βy) and the distance L between the camera 110 and the target 50, the position coordinates (Xr, Yr) are calculated by the above equation (2) (step 132).

  As described above, the measurement error of the position coordinates (Xt, Yt) of the target 50 due to the tilt of the optical axis 112 of the camera 110 with respect to the vertical axis can be corrected, and the installation of the camera 110 on the back strut 10 is performed. Regardless of the state, the erection error (Xr, Yr) of the striking strut 10 can be accurately measured. Therefore, the installation work of the camera 110 is easy.

  In addition, even if the installation state of the camera 110 installed on the head is corrected by correcting the erection of the back strut 10, accurate measurement in the changed state is performed without correcting the installation state of the camera 110. Therefore, the erection error (Xr, Yr) can be measured while correcting the erection posture of the back strut 10.

  10 (A) to 10 (E) and FIG. 11 are diagrams showing a work procedure for installing the back strut 10. First, as shown in FIG. 10A, a hole 2 for constructing the pile 1 is excavated by a known excavator such as an earth drill excavator, and necessary operations such as bottom preparation and slime treatment are performed. . Moreover, the casing 3 is built in a surface layer part. Next, as shown in FIG. 10B, the gantry 6 for supporting the counter-strut 10 is installed on the ground so as to straddle the hole 2. Then, the reinforcing bar 5 is built in the hole 2 by hanging the reinforcing bar 5 with the crane 4 and lowering it to the bottom of the hole 2.

  Next, as shown in FIG. 10C, the Yatco 104 is attached to the head of the counter strut 10. Then, the back strut 10 is erected and installed in the hole 2. Further, a water pipe 13 for supplying the stabilizing liquid is built in the hole 1.

  Next, as shown in FIG. 11, the height of the head of the striking strut 10 and the position in the horizontal direction are adjusted. Thereafter, by adjusting the horizontal position of the lower portion of the striking strut 10, the verticality (building posture) of the core of the striking strut 10 is adjusted.

  A plurality of journal jacks 7 are installed on the gantry 6, and the backlash struts 10 are supported by the plurality of journal jacks 7 through the yatco 104. The journal jack 7 is a screw-type jack that expands and contracts in the vertical direction, and the height of the head of the counter strut 10 can be adjusted by expanding and contracting the journal jack 7.

  A plurality (for example, four as shown) pantograph jacks 8 are installed between the casing 3 and the counter strut 10. A plurality of pantograph jacks 8 are arranged for each flange of the counter strut 10. The plurality of pantograph jacks 8 are pantograph type hydraulic jacks, which take a reaction force on the casing 3 to press the counter strut 10 toward the center of the hole 2. By extending or contracting the plurality of pantograph jacks 8 in the radial direction of the hole 2, the horizontal position of the lower portion of the counter strut 10 can be adjusted.

  Next, as shown in FIG. 10 (D), the tremy tube 11 is built in the hole 2 and concrete is placed below the hole 2. At this time, by adjusting the position in the horizontal direction of the lower portion of the striking strut 10, the erection posture of the striking strut 10 is adjusted.

  Then, after removing the tremy tube 11, the concrete is cured, and the gantry 6 and the Yatco 104 are removed in a state where the back strut 10 is temporarily fixed. Thereafter, as shown in FIG. 10 (E), the back strut 10 is buried in the ground by backfilling the soil with the top of the hole 2.

  FIG. 12 is a flowchart for explaining a procedure for correcting the erection posture of the back strut 10. As shown in this flowchart, first, the distance L between the camera 110 and the target 50 is input to the computer 130 (step 101). Here, the measuring unit 101 is installed on the installation base 108 in accordance with the reference line before the reverse strut 10 is installed.

  Next, the target 50 is photographed with the camera 110 (step 102). As described above, when the target 50 is photographed by the camera 110, the position coordinate extraction unit 132A extracts the position coordinate (Xt, Yt), and the position coordinate correction unit 132B detects the measured value (αx of the inclinometer 120). , Αy) to calculate the tilt angle (βx, βy) of the camera 110 and correct the position coordinate (Xt, Yt) based on the tilt angle (βx, βy) to calculate the position coordinate (Xr, Yr). .

  Next, it is determined whether or not the erection error (Xr, Yr) measured by the erection error measurement system 100 is within the management value (step 103). 8 corrects the erection posture of the back strut 10 (step 104). At this time, until the erection error (Xr, Yr) measured by the erection error measuring system 100 falls within the control value, the correction of the erection posture of the back strut 10 by the pantograph jack 8 is continued.

  As described above, after the camera 110 is installed on the YATCO 104, the installation error (Xr, Yr) of the backlash strut 10 is automatically determined regardless of the installation state of the camera 110 on the backlash strut 10. It can be measured accurately. Therefore, not only before placing the concrete of the pile 1 after placing the reverse strut 10 but also during the concrete placement of the pile 1 thereafter (Xr, Yr) It is possible to correct the erection posture of the striking strut 10 while measuring. Moreover, the installation operation | work of the apparatus used for the measurement of the erection error of the back strut 10 can be facilitated.

  Here, by arranging the target 50 in the vicinity of the head of the pile 1, the position of the root portion (lower end) of the portion of the counter strut 1 near the head of the pile 1, that is, the portion rising from the pile 1. The error can be measured. Moreover, by arranging the pantograph jack 8 in the vicinity of the head of the pile 1, the position of the root portion of the portion of the counter strut 10 that stands up from the pile 1 can be corrected.

  In the above embodiment, most of the struts 10 are made of cross H-shaped steel. However, the present invention is not limited to this, and an appropriate steel material such as H-shaped steel or square steel pipe can be used. Moreover, in the said embodiment, although the upper part of the reverse strut 10 was comprised with the square steel pipe, it is not restricted to this, A round steel pipe can also be used.

  Moreover, in the said embodiment, although the case where the installation error of the reverse strut 10 built in the ground was measured was demonstrated, it is not restricted to this, H-shape steel and the steel pipe which are the core materials of soil cement column wall The present invention can be applied to a case where a long erection member is installed in the vertical direction, such as when an erection error is measured, or when a erection error of a seawall built in water is measured.

  Moreover, in the said embodiment, although the error of the position of the base part (lower end part) of the part which stood up from the pile 1 of the striking strut 10 was measured as an erection error, the inclination angle etc. with respect to the vertical axis of the striking strut 1 etc. May be measured as an erection error.

1 pile, 2 holes, 3 casing, 4 crane, 5 reinforcing bar, 6 mount, 7 journal jack, 8 pantograph jack, 10 counter strut, 11 tremy pipe, 12 stud, 13 water pipe, 20 guide pipe, 21 core, 22 Bracket, 50 Target, 51 Reflector, 100 Installation error measurement system, 101 Measurement unit, 102 Plate, 104 Yatco, 106 Illumination, 108 Installation table, 110 Camera, 112 Optical axis, 114 Captured image, 120 Inclinometer, 130 computer, 132 CPU, 132A position coordinate extraction unit, 132B position coordinate correction unit, 134 memory, 136 interface, 138 monitor

Claims (6)

An erection error of a laying member that is erected so as to extend in the vertical direction in the ground or underwater is at the position of an index provided inside the tubular body that is attached to the erection member so as to extend in the vertical direction. A measurement system based on
A camera installed to photograph the index above the tube;
An inclinometer for measuring the tilt of the camera;
An index position extraction unit that extracts a position of the index based on imaging information of the camera;
An index position for calculating an inclination angle of the optical axis of the camera with respect to a vertical axis based on a measurement value of the inclinometer, and correcting the position of the index extracted by the index position extraction unit based on the calculated inclination angle A system for measuring an erection error of an erection member comprising a correction unit.   The erection member according to claim 1, wherein the index position correction unit calculates the inclination angle corresponding to the measurement value of the inclinometer from a relational expression indicating a relationship between the measurement value of the inclinometer and the inclination angle. Erection error measurement system. An erection error of a laying member that is erected so as to extend in the vertical direction in the ground or underwater is at the position of an index provided inside the tubular body that is attached to the erection member so as to extend in the vertical direction. A measurement method based on
Installing a camera and an inclinometer that measures the tilt of the camera above the tube and photographing the index with the camera;
Extracting the position of the index based on imaging information of the camera;
Calculating an inclination angle of the optical axis of the camera with respect to a vertical axis based on a measurement value of the inclinometer;
Correcting the position of the extracted index based on the calculated inclination angle.   The building according to claim 3, wherein in the step of calculating the tilt angle, the tilt angle corresponding to the measured value of the inclinometer is calculated from a relational expression indicating a relationship between the measured value of the inclinometer and the tilt angle. Measuring method for erection error. A step for obtaining the relational expression;
In this step,
A first step of installing a camera and the inclinometer above the tubular body, photographing the index with the camera, and extracting position coordinates of the index based on imaging information of the camera;
A second step of rotating the camera and the inclinometer by 180 ° about the vertical axis about the camera, photographing the index with the camera, and extracting position coordinates of the index based on imaging information of the camera; When,
A third step of calculating an average value of the position coordinates of the index extracted in the first step and the second step;
Based on the average value calculated in the third step, the fourth step of calculating the tilt angle in the first step is performed a plurality of times to obtain a linear equation between the measured value of the inclinometer and the tilt angle. The measuring method of the erection error of the erection member according to claim 4. It is a method of laying back struts on the ground,
A tube having an index provided therein is attached to the back strut so as to extend in the vertical direction, a camera and an inclinometer for measuring the tilt of the camera are installed above the tube, and the back strut Laying the ground on the ground and photographing the index with the camera;
Extracting the position of the index based on imaging information of the camera;
Calculating an inclination angle of the optical axis of the camera with respect to a vertical axis based on a measurement value of the inclinometer;
Correcting the position of the extracted index based on the calculated tilt angle;
Based on the corrected position of the indicator, calculating a erection error of the backlash strut,
Correcting the erection posture of the counter-strut so that the calculated erection error is reduced.

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