JP2014089211A - Tunnel cross-section measurement method using three-dimensional laser scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate measurement of a cross section and evaluation and management on an excavation cross section and a lining cross section without making work in one cycle of tunnel excavation construction complicated, and to achieve shortening of a construction period and improvement in construction precision.SOLUTION: A tunnel cross-section measurement method using a three-dimensional laser scanner includes: fixing a plurality of targets in a tunnel and making a laser scan so as to measure a tunnel cross section in terms of scan coordinates based upon origin coordinates of the three-dimensional laser scanner; recognizing the targets from data absence of scan coordinates and acquiring tunnel coordinates of the respective targets on the basis of a pattern of the data absence; and converting scan coordinates of the tunnel cross section into tunnel coordinates on the basis of the scan coordinates of the respective targets and the tunnel coordinates.

Description

  The present invention relates to a tunnel cross-section measuring method using a three-dimensional laser scanner in which a plurality of targets are fixed in a tunnel.

  NATM (New Austrian Tunneling Method) is a standard underground excavation method for mountain tunnels. NATM uses the support materials such as spray concrete, rock bolts, steel support works, etc. as appropriate based on the idea of maintaining the stability of the tunnel by effectively using the support capacity and strength of the natural ground. It is a construction method to construct a tunnel structure integrated with a mountain. In NATM, construction management is carried out by on-site measurement, the behavior of natural ground is grasped, and mechanical studies are conducted. Therefore, a series of measurement management operations that collect a lot of data during construction, analyze and evaluate the data, and present countermeasures are very important elements. In particular, it is required to smoothly perform measurement work, analysis of the data, and output of evaluation results.

  Generally, in tunnel excavation work, tunnel faces are drilled and charged with gunpowder, blown up, then slashed, scraped, supported, primary lining, and placed with rock bolts. With this as one cycle, the excavation work cycle is repeated at a pitch of about 1.5 m. Then, the displacement of the sky section in the tunnel and the behavior of the natural ground are measured at the rear, and after confirming that the behavior of the natural ground has stabilized, the final secondary lining is performed. The cross section of this secondary lining is the design cross section of the completion of the tunnel excavation work.

  The concrete thickness of the secondary lining (secondary lining thickness) is determined by the strength and stability of the natural ground. Along with this, the adoption of support work on the inner side (back side), the concrete blast thickness of the primary lining, the number of times, etc. are determined, and the initial excavation cross section is also determined according to these conditions.

  The hitting is a change in a section where the cross section is insufficient to secure the concrete thickness of the secondary lining, and is usually determined by the operator's visual judgment. If the hitting is insufficient in the primary lining section before the secondary lining, it will be necessary to rearrange the machinery and perform the winning work, which wastes working time and costs. Become more. On the contrary, Yohori is filled with primary lining by spraying concrete, but if there is a large amount of Yohbori, the amount of slippage work and the amount of concrete spraying of the primary lining will increase. More time and money is wasted.

  In tunnel excavation work, measurement management work in the construction cycle is a very important element in order to reduce wasteful work and costs as much as possible and to reduce the time required for each work and to carry out work efficiently. (See, for example, Patent Documents 1 to 3). In Patent Document 1, a laser transit is installed on a ceiling in a tunnel, a laser beam is irradiated on a target, a position and an installation posture of a light wave range finder are detected, and an inner space of a tunnel face is detected by a light wave range finder. The cross-section is measured to determine the hollow cross-sectional shape. Further, Patent Document 2 measures a tunnel internal section using a light wave range finder located behind the face, and shows the amount of each displacement, spray thickness, and lining thickness in a developed view of the size of a figure, symbol, or mark. It will be displayed. Japanese Patent Laid-Open No. 2004-228688 performs tunnel stereometry using a total station, a survey target, and a three-dimensional laser scanner, and projects a three-dimensional figure in three-dimensional coordinates onto two-dimensional coordinates and draws it on a screen.

Japanese Patent No. 2627980 Japanese Patent No. 3842771 JP 2006-162444 A

  However, in conventional tunnel excavation work, it is common to perform excavation by repeating the construction cycle up to primary lining by concrete spraying and rock bolt placement, and measure the cross section behind it to evaluate the internal cross section It was the target. In the conventional tunnel cross-section measurement system, there are many total stations, targets, distance measuring devices, and other equipment as proposed in the above-mentioned patent document, and the installation, setting and measurement work thereof becomes complicated. This is because labor and time are required. In addition, when conventional measurement work is incorporated in the middle of one cycle of tunnel excavation work, the construction time required for one cycle becomes long and the construction period cannot be shortened.

  The present invention can easily measure the cross-section, evaluate the cross-section of the excavation, and the cross-section of the lining, and improve the construction accuracy without complicating the work in one cycle of the tunnel excavation work. It is intended to be able to plan.

  To this end, the present invention is a tunnel cross-section measuring method using a three-dimensional laser scanner, in which a plurality of targets are fixed in the tunnel, laser scanning is performed, and a tunnel cross-section by scan coordinates based on the origin coordinates of the three-dimensional laser scanner. Measures the target, recognizes the target by missing data in the scan coordinates, acquires the tunnel coordinates of each target based on the data missing pattern, and sets the scan coordinates of the tunnel cross-section to the tunnel coordinates based on the scan coordinates of each target and the tunnel coordinates. It is characterized by converting into.

  Further, after the first measurement for recognizing the target by missing the scan coordinate data is performed to obtain the tunnel coordinates of each target, the second measurement is performed to scan the tunnel cross section based on the scan coordinates and the tunnel coordinates of each target. It is characterized by converting coordinates into tunnel coordinates, and as a target, a target having a mirror surface or a highly reflective finish area with high regressivity is fixed in the tunnel, and the target is rotated in an orthogonal direction. A possible target is mounted on an anchor in the tunnel.

  According to the present invention, a plurality of targets are fixed in a tunnel, laser scanning is performed, tunnel cross-section is measured with scan coordinates based on the origin coordinates of a three-dimensional laser scanner, and the targets are recognized by missing data in the scan coordinates. Therefore, the target can be arbitrarily determined from the scan coordinates at which the tunnel cross-section is measured without being particularly aware of the position of the target when performing laser scanning. Then, the tunnel coordinates of each target are acquired based on the pattern of missing data, and the scan coordinates of the tunnel cross section are converted into tunnel coordinates based on the scan coordinates and tunnel coordinates of each target, so that the 3D laser is unaware of the tunnel coordinates. The position of the scanner can also be freely selected, and measurement with the total station can be performed easily. Cross-section measurement, excavation cross-section, and lining cross-section evaluation can be performed without complicating the work of three-dimensional measurement with a three-dimensional laser scanner. Can be managed, and the construction period can be shortened and the construction accuracy can be improved.

It is a figure explaining embodiment of the tunnel excavation construction which employs the tunnel section measuring method using the three-dimensional laser scanner concerning the present invention. It is a figure explaining the construction cycle of the tunnel excavation construction concerning this embodiment. It is a figure which shows embodiment of the target used by cross-section measurement. It is a figure which shows the structural example of the marking surface of a target main body. It is a figure which shows the example of the pattern of data missing. It is a figure explaining embodiment of the processing apparatus of measurement data. It is a figure explaining the coordinate conversion from the measurement data by a three-dimensional laser scanner. It is a figure explaining the example of an output of hit and surplus mining. It is a figure explaining the flow of the process which carries out the coordinate conversion of measurement data by the tunnel cross-section measuring method using the three-dimensional laser scanner concerning this invention, and outputs the expanded view of cross-section data. It is a figure explaining the expanded view to output.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining an embodiment of tunnel excavation work that employs a tunnel cross-section measuring method using a three-dimensional laser scanner according to the present invention, and FIG. 2 is a diagram for explaining a construction cycle of tunnel excavation work according to this embodiment. It is. In the figure, 1 is a face surface, 2 is a drilling wall surface, 3 is a primary lining surface, 4 is a bottom board, 5 is a drilling section, 6 is a reference section, 7 is a lock bolt, 31 is an anchor, 100 is a three-dimensional laser scanner, 200 Denotes a measurement data processing apparatus, and 300 denotes a target. The lower suffix L indicates the left wall surface, R indicates the right wall surface, and U indicates the top end surface.

  Fig. 1 (A) shows a side view of the mine before the primary lining in tunnel excavation work, and Fig. 1 (B) shows a top view of it. FIG. 1C shows the excavation cross section close to the face 1. In FIG. 1, the face surface 1 and the excavation wall surface 2 are in a state of being excavated by blasting or using a machine, and the primary lining surface 3 is a surface where concrete is sprayed on the excavated wall surface that has been hit.

The excavation cross section 5 shown in FIG. 1 (C) shows the cross sectional shape of the excavation wall surface 2, and the reference cross section 6 has a cross sectional shape corresponding to the primary lining that is larger than the design cross section or the planned cross section by the secondary lining thickness, for example. Show. The three-dimensional (3D) laser scanner 100 is installed on the bottom plate 4 behind the face in the tunnel, for example, performs laser scanning in the horizontal direction and the vertical direction, and each of the horizontal angle (0 to 360 °) and the vertical angle (upward) 0 to 90 °, and 0 to 60 ° below), the distance to the laser irradiation point is measured. The three-dimensional laser scanner 100 may be placed on a heavy machine. The measurement data processing device 200 is a computer that takes in measurement data of a distance corresponding to a horizontal angle and a vertical angle from the three-dimensional laser scanner 100 and performs various arithmetic processes based on the measurement data. The target 300 has tunnel coordinates (x, y, z) and is detachably mounted on the left and right wall surfaces 3 _L and 3 _R of the primary lining surface 3. As the tunnel coordinates, public coordinates set by the so-called Geographical Survey Institute are used, and local coordinates unique to the tunnel set based on the public coordinates may be used.

  Next, the construction cycle of the tunnel excavation construction method using the three-dimensional laser scanner according to the present embodiment will be described. As shown in FIG. 2, the construction cycle is performed by first excavating the working face 1 with a work pitch of one cycle, for example, about 1.5 m (step S11: excavation process), and excavating the gap (step S12: Slipping process). This excavation includes, for example, blast excavation and mechanical excavation in which holes are drilled at predetermined positions on the face 1 and charged with an explosive and ignited for explosion.

Then, the measurement process which consists of step S13-S18 is performed. In the measurement process, the targets 300 _L1 , 300 _L2 , 300 _R1 , and 300 _R2 are mounted at predetermined positions on the left and right wall surfaces 3 _L and 3 _R of the primary lining surface 3 (Step S13), and the primary lining surface 3 behind the face is mounted. The three-dimensional laser scanner 100 and the measurement data processing device 200 are installed on the bottom plate 4 (step S14), and the excavation wall surface 2 is measured (step S15). Next, the measurement data is processed to compare the excavation cross section data with the reference cross section data (step S16), and the comparison cross section data between the excavation cross section and the reference cross section is output (step S17). Then, the targets 300 _L1 , 300 _L2 , 300 _R1 , and 300 _R2 are removed (step S18).

  Winning is performed based on the output of the comparison cross section data (step S19: winning process). After winning, the primary lining by concrete spraying is performed (step S20: lining process), and the natural ground is reinforced by placing the lock bolt 7 (step S21: reinforcing process). When excavation is continued (step S22), the process returns to step S11 again and the same operation is repeated without ending the operation.

  The hitting process and the lining process are appropriately performed according to the support capacity, strength, stability, etc. of the natural ground, or the concrete spraying work is divided into primary and secondary. For example, if the ground is weak and there is a high risk of rock fragments and earth and sand collapsing, a simple concrete spraying may be performed first to stabilize the excavation surface, and then hitting may be performed. Further, the winning may be performed by visual judgment of the operator, and then the cross-sectional measurement may be performed to confirm the winning.

  Therefore, in the construction cycle described with reference to FIG. 2, the measurement process by the 3D laser scanner 100 is performed immediately after the slipping process, and the winning process is performed by looking at the output, but the measurement process by the 3D laser scanner 100 is Further, it may be performed after the winning process in step S19 or after the lining process in step S20. Also, not only after the scraping process, after the hitting process, or after the lining process, but also according to each process, winning conditions, winning conditions, and natural conditions Multiple measurements may be performed.

  FIG. 3 is a diagram showing an embodiment of a target used in cross-sectional measurement, FIG. 4 is a diagram showing a configuration example of a marking surface of a target body, and FIG. 5 is a diagram showing an example of a data missing pattern. In the figure, 300 is a target, 301 is an outer frame, 302 is a main body, 303 is a base, 304 is a bolt, and 305 is a rotation axis.

  For example, as shown in FIG. 3A, the target 300 is rotatably attached to an outer frame 301 with a main body 302 serving as a marking surface with a rotation shaft 305, and the outer frame 301 is attached to a base 303 with an axis orthogonal to the rotation shaft 305. A bolt 304 is attached to the pedestal 303. An anchor 31 having a screw hole is driven on the primary lining surface 3, and the target 300 is mounted by screwing a bolt 304 of the target 300 into the screw hole of the anchor 31. Since the target 300 is mounted and removed in order to prevent damage caused by scattering of debris caused by blasting during excavation, the target 300 is not limited to the above-described procedure. It may be attached or removed at any time after measurement and before blasting. Of course, it can be used without being removed by covering with a protective cover.

  In the present embodiment, the anchor 31 is a mounting bracket for the target 300, and is not limited to the types of bolt-in anchors such as anchor bolts and grip anchors, and may be bonded. On the contrary, the anchor 31 may be screwed into a screw hole of the target 300 with the head as a bolt, or a field structure such as the lock bolt 7 or a support work may be used as the anchor 31. Furthermore, it may be attached and fixed via an intermediate member having bolts and nuts. Further, in the target 300 shown in FIG. 3B, an anchor 31 ′ having a fitting hole is driven on the primary lining surface 3 and is attracted to the fitting hole by a magnet 304 ′.

When the target 300 is mounted on the anchor 31 of the primary lining surface 3, the coordinates of the center position O of the main body 302 are rotated regardless of whether the target 300 rotates about the illustrated vertical axis R _v or the horizontal axis R _h. Will not change. The coordinates of the center position O of the main body 302 are the tunnel coordinates (x, y, z) of the target 300. The surface of the main body 302 is a sign surface having line information intersecting at the center position O. For example, as shown in FIG. 3 and FIG. By using the upper and lower regions 312 as surfaces having high reflection intensity, the reflection intensity is changed so that the measurement data can be identified. When the boundary lines m1 and m2 of the mark X are detected from the measurement data d obtained by scanning in the illustrated direction, the center position O of the main body 302 can be accurately obtained.

  Similarly, as shown in FIG. 4B, by changing the reflection intensity of the lower left and upper right area 312 with respect to the upper left and lower right area 311 at the + mark, the measurement data can be identified. Good. However, in the scanning in the illustrated direction, the detection accuracy of the vertical boundary line is lower than in the case where the boundary of the region enters between the scans and the mark of X, so the accuracy of the required center position O of the main body 302 is lower. Therefore, it is necessary to employ image processing for increasing detection accuracy. In addition to the + and X marks, a circle or other mark capable of detecting the center position O may be employed.

In the measurement data processing apparatus 200, when the measurement data of the distance L corresponding to the horizontal angle θ and the vertical angle φ is taken from the three-dimensional laser scanner 100, the scanner coordinates (x _si, y based on the origin coordinates of the three-dimensional laser scanner 100 are obtained. _si, z _si ) data is obtained. This scanner coordinate (
The tunnel coordinates of the target 300 are used to convert x _si, y _si, z _si ) into tunnel coordinates (x _ti, y _ti, z _ti ). The center position O of the target 300 is detected in the scanner coordinate data, and the scanner coordinate data is converted into tunnel coordinates based on the scanner coordinates and tunnel coordinates of the center position O.

  In the present embodiment, in order to easily recognize the area where the target 300 is installed in the scanner coordinate data, a pattern 306 using, for example, a reflection sheet or an absorption sheet that can be recognized as missing data is arranged. The reflective sheet is a highly reflective sheet with a mirror finish that has a reflection angle equal to the incident angle, a highly reflective sheet that reflects in the light incident direction by an array of microprisms, or the like. The absorption sheet is an extremely low reflection sheet that has extremely low reflectance and absorbs incident light. Such a pattern 306 is disposed on an outer frame 301 that forms the outer periphery, for example, as shown in FIG.

  In the outer frame 301 having the pattern 306 using a mirror-like highly reflective sheet, the reflected light does not return to the three-dimensional laser scanner 100 unless it is accurately directed to the three-dimensional laser scanner 100. Therefore, the reflected light data is detected. The data is lost. In normal target mounting work, it is unlikely that the reflected light from the pattern 306 using the mirror-like high-reflection sheet of the outer frame 301 will be accurately directed to return to the three-dimensional laser scanner 100. Thus, the inner area can be easily recognized as a coordinate area where the target 300 exists.

  In addition, in the outer frame 301 having the pattern 306 using a highly reflexive highly reflective sheet, the reflected light returns to the light emitting unit, but the light receiving unit is arranged near the light emitting unit, so the reflected light is reflected. No data is detected and data is lost. The outer frame 301 having the pattern 306 using the absorbing sheet absorbs incident light and has almost no reflected light. Alternatively, a sheet with irregular reflection finish may be used. In short, if a sheet that can acquire data capable of recognizing a pattern in scanner coordinate data is used, pattern matching with each pattern of the target 300 can be performed based on the data, and the target 300 can be specified and the tunnel coordinates possessed by the target 300 can be acquired. It becomes.

  In general, the target 300 has a size of several cm square, but may be several tens cm square or several hundred cm square. As shown in FIG. 3A, when the pattern 306 is provided on the outer frame 301, the pattern becomes smaller corresponding to the size of the target 300. Therefore, when the size of the pattern 306 is increased to several tens of centimeters and several hundreds of centimeters in comparison with the target 300 having a size of several centimeters so that the region can be easily recognized, for example, as shown in FIG. However, it is not provided on the outer frame 301 ′ of the target 300 but on the outside thereof.

  Therefore, by recognizing the data missing area in the scanner coordinate data by the rough laser scan (pre-scan), the scanner coordinate area where the target 300 exists can be easily recognized. When the mirror finish pattern of the outer frame 301 is registered and mounted as a specific pattern by the target 300 as shown in FIG. 5, for example, the target 300 can be identified by collating the data missing pattern, and its tunnel coordinates are acquired. Can do. As shown in the figure, the missing data pattern is not identified by the position where the sides of the rectangle or polygon are missing, but is identified by a shape such as a rectangle, polygon, circle, ellipse, or petal pattern. You may identify and combine with the missing position.

  Also, one of the areas 311 and 312 on the marking surface of the main body 302 shown in FIG. May be. By using a mirror surface or a highly reflective surface with a high reflexive finish and a surface with high reflection intensity, it is easy to recognize high reflection intensity data and missing data areas, and at the same time detect boundaries. Can be easily. Therefore, it is easy to recognize the area where the target 300 is installed and to detect the center position O having the specific tunnel coordinates, and it is possible to acquire the tunnel coordinates of the target using only the sign surface of the main body 302. It becomes.

  The pre-scan may be used as a measurement scan of the excavation wall surface, or may be executed for region recognition of the target 300 separately from this scan. As described above, since the area of the target 300 can be recognized based on the data missing area, the center position O of the target 300 shown in FIG. Tunnel coordinates can be acquired. Further, by displaying the measurement data on the screen, the operator may instruct the position of the target 300, and the area may be laser-scanned at a high density. In this case, by using the target 300 with the outer frame 301 having a mirror finish, the position can be accurately designated from the data missing area.

  Next, an embodiment of a support system for a tunnel excavation construction method using the three-dimensional laser scanner according to the present invention will be described. FIG. 6 is a diagram for explaining an embodiment of a measurement data processing device, FIG. 7 is a diagram for explaining coordinate transformation from measurement data by a three-dimensional laser scanner, and FIG. FIG. 9 is a diagram for explaining the flow of processing for converting the measurement data into coordinates by the tunnel cross-section measurement method using the three-dimensional laser scanner according to the present invention and outputting a development view of the cross-section data, and FIG. It is a figure to do. In the figure, 100 is a three-dimensional laser scanner, 200 is a measurement data processing device, 201 is target data, 202 is design data, 203 is display attribute data, 204 is scanner measurement data, 205 is coordinate conversion parameters, and 206 is a reference. Cross section data, 207 is tunnel coordinate measurement data, 208 is comparison cross section data, 211 is a scanner coordinate conversion processing unit, 212 is a target recognition processing unit, 213 is a parameter calculation processing unit, 214 is a reference data calculation processing unit, and 215 is a tunnel A coordinate conversion processing unit, 216 indicates a cross-sectional comparison calculation processing unit, and 217 indicates a comparative cross-section output processing unit.

FIG. 6 shows a specific configuration example of the measurement data processing apparatus 200. In FIG. 6, target data 201 is a storage unit that stores tunnel coordinate data of each target 300 _L1 , 300 _L2 , 300 _R1 , 300 _R2 and discrimination / recognition information such as a data missing pattern. For example, the coordinates of the reference point outside the mine by using a total station at the time of anchor installation, the horizontal alignment of the tunnel (line of the tunnel center on the plane), the vertical alignment (line of the tunnel center of the high and low), the cross section It is obtained in advance from the data and stored in the storage unit.

  The design data 202 is a storage unit that stores data such as a plane alignment, a longitudinal alignment, a cross section (secondary lining cross section), and a lining thickness at the completion of a tunnel to be excavated. The display attribute data 203 is a storage unit that stores, for example, data such as hue, saturation, luminance, blinking presence / absence, and cycle as a display attribute for outputting a comparison result between the reference cross section data and the tunnel coordinate measurement data. .

  The measurement data 204 of the scanner is a storage unit that stores the three-dimensional measurement data measured by the three-dimensional laser scanner 100. The distance data corresponding to the horizontal angle and the vertical angle, and the three-dimensional laser from these data. This is three-dimensional scanner coordinate data calculated based on the origin coordinates (0, 0, 0) of the scanner 100.

  The coordinate conversion parameter 205 is a storage unit that stores conversion parameters for converting scanner coordinate data stored in the measurement data 204 of the scanner into tunnel coordinates, and is obtained based on the scanner coordinates and tunnel coordinates of each target 300. .

  The reference cross-section data 206 is a storage unit that stores reference data for the secondary lining section, the primary lining section, and the excavation section to be compared with the measurement data of the tunnel coordinates, and is obtained from the design data 202.

  The tunnel coordinate measurement data 207 is a storage unit that stores data converted from the scanner coordinate data stored as the scanner measurement data 204 into the tunnel coordinates based on the coordinate conversion parameter 205.

  The comparison cross-section data 208 is a storage unit that stores data obtained by comparing the tunnel coordinate measurement data 207 with the reference cross-section data 206, and the difference between the cross-sections subjected to the comparison calculation represents the hit or the amount of excavation.

  The scanner coordinate conversion processing unit 211 converts data of the distance d measured by the three-dimensional laser scanner 100 and the horizontal angle θ and the vertical angle φ at that time into scanner coordinate data, and data of the distance d = 0. Becomes the origin coordinates (0, 0, 0) of the scanner coordinates. The target recognition processing unit 212 recognizes the position of the target from the measurement data 204 of the scanner, and performs processing for extracting the scanner coordinates and tunnel coordinates of the target.

For example, when the front surface of the three-dimensional laser scanner 100 is the x-axis direction and the horizontal angle θ with reference to the x-axis and the vertical angle φ with reference to the xy plane are defined as shown in FIG. Measurement data (x _s , y _s , z _s ) of the scanner coordinates by the scanner coordinate conversion processing unit 211 based on the data.
x _s = d cosφ cosθ
y _s = d cosφ sinθ
z _s = d sinφ
Is required.

The parameter calculation processing unit 213 performs processing for calculating a coordinate conversion parameter 205 for converting from scanner coordinate data to tunnel coordinates based on the scanner coordinates and tunnel coordinates of each target extracted by the target recognition processing unit 212. It is. The tunnel coordinate conversion processing unit 215 performs processing for converting the scanner coordinate measurement data into the tunnel coordinate measurement data 207 based on the coordinate conversion parameter 205. These conversion processes are well known, and for example, an algorithm described in Patent Document 3 can be used. From the scanner coordinates (x _s , y _s , z _s ) to the tunnel coordinates (x _ti, y _ti, z _ti ) Can be requested.

  The reference data calculation processing unit 214 performs processing for generating reference cross-section data 206 for obtaining the hit amount and the surplus amount from the design data 202. The cross-section comparison calculation processing unit 216 compares the tunnel coordinate measurement data 207 with the reference cross-section data 206 and performs calculation processing of the hit and surplus amount in each cross section. The hit and surplus amount in each cross section Is obtained as comparative cross-sectional data 208.

The comparison section output processing unit 217 determines the display attribute based on the display attribute data 203 based on, for example, hue, saturation, brightness, presence / absence of blinking, period, etc. according to the hit or comparison amount of the comparison section data 208 and outputs it. The process which performs is performed. In the process of determining and outputting the display attribute according to the hit of the comparison cross section data 208 and the surplus amount, the lining thickness t (primary + secondary) from the design line which is the line of the design cross section / secondary lining cross section. Add ₁ to find the reference cross section line.

  Then, when hitting, the line of the excavation cross section is located on the inner side of the mine from the line of the reference cross section, and the excavation has the line of the excavation cross section on the ground side. In the display attribute, for example, as shown in FIG. 8, hue, saturation, and luminance are set according to the amount of the hits and surpluses, and further, display attributes to be emphasized for the hits are set. The display attributes to be emphasized are especially for calling attention, and are set to a particularly conspicuous color with high saturation, high brightness, or blinking. The output of the comparative section information may be an output based on a sectional view, a numerical value of a difference, a table, or other information, as well as an output based on the developed view as described above.

  For example, as shown in FIG. 9 (A), a three-dimensional scanner is used as a process of performing three-dimensional measurement and outputting comparison cross-section data with a desired display attribute by comparison between excavation cross-section data and reference cross-section data. Coordinate measurement data is obtained and stored in the storage unit (step S31).

  Next, a data missing pattern is detected from the three-dimensional measurement data (step S32), and the pattern is collated with the target recognition pattern (step S33). Then, the tunnel coordinates registered in the target recognition pattern are acquired (step S34), and the scanner coordinates of the center position O of the target are obtained from the three-dimensional measurement data in the data missing pattern (step S35).

  Next, a coordinate conversion parameter is calculated from the scanner coordinates of the center position O based on the measurement data of the target and the tunnel coordinates of the target (registered) (step S36), and the coordinates of the measurement data are tunneled using the coordinate conversion parameters. The coordinates are converted (step S37). Further, reference data is obtained from the design data (step S38), the excavation cross section of the measurement data converted into tunnel coordinates is compared with the reference cross section of the reference data (step S39), and displayed in the comparison cross section data thus calculated. The attribute is set (step S40), and the data of the comparison section is developed and output with the set display attribute (step S41). As shown in FIG. 10, the information of the comparison cross section corresponds to the situation where the operator looks toward the face when the face is faced up and is developed on both sides from the center of the top of the tunnel. The situation at each point on the cross section is easy to grasp.

In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above-described embodiment, a case has been described in which three-dimensional measurement is performed before hitting and information on a comparison cross section between the measurement cross section and the reference cross section is output. Processing may be performed in such a manner that three-dimensional measurement is performed before hitting after spraying, and information on the comparison cross section is output in the same manner. Of course, it is needless to say that the same process may be performed by spraying concrete and performing three-dimensional measurement after the primary lining. The information of the comparison cross section may be printed out. The target was shown to be detachably attached to the anchor of the primary lining wall surface by screwing bolts and nuts or attracting magnets, but it should be fixed to the wall surface and covered with a cover to avoid damage during excavation. It may be. Moreover, although mounted on the left and right wall surfaces, it is not limited to the left and right wall surfaces, and may be installed on the bottom panel or the top.

  DESCRIPTION OF SYMBOLS 1 ... Face face, 2 ... Excavation wall surface, 3 ... Primary lining surface, 4 ... Bottom board, 5 ... Excavation cross section, 6 ... Reference | standard cross section, 31 ... Anchor, 100 ... 3D laser scanner, 200 ... Measurement data processing apparatus, 201 ... Target data 202 ... Design data 203 ... Display attribute data 204 ... Scanner measurement data 205 ... Coordinate conversion parameter 206 ... Reference cross section data 207 ... Tunnel coordinate measurement data 208 ... Comparison cross section data 211 ... Scanner Coordinate conversion processing unit, 212 ... target recognition processing unit, 213 ... parameter calculation processing unit, 214 ... reference data calculation processing unit, 215 ... tunnel coordinate conversion processing unit, 216 ... cross-sectional comparison calculation processing unit, 217 ... comparative cross-section output processing unit , 300 ... target, 301 ... outer frame, 302 ... main body, 303 ... pedestal, 304 ... bolt, 305 ... rotating shaft

Claims (4)

A tunnel cross-section measurement method using a three-dimensional laser scanner,
Multiple targets are fixed in the tunnel, laser scanning is performed, the tunnel cross section is measured by the scan coordinates based on the origin coordinates of the 3D laser scanner, the target is recognized by the missing data of the scan coordinates, and the data missing pattern A tunnel cross-section measurement method using a three-dimensional laser scanner, wherein the tunnel coordinates of each target are acquired based on the scan coordinates, and the scan coordinates of the tunnel cross-section are converted into tunnel coordinates based on the scan coordinates and the tunnel coordinates of each target. After the first measurement for recognizing the target by missing the scan coordinate data and acquiring the tunnel coordinates of each target, the second measurement is performed to determine the scan coordinates of the tunnel cross section based on the scan coordinates and the tunnel coordinates of each target. The tunnel cross-section measuring method using the three-dimensional laser scanner according to claim 1, wherein the tunnel cross-section is converted into tunnel coordinates. 3. A tunnel cross-section measurement using a three-dimensional laser scanner according to claim 1, wherein a target having a mirror surface or a highly reflective finish region having a high recursive property is fixed in the tunnel as a target. Method. The tunnel cross-section measuring method using a three-dimensional laser scanner according to any one of claims 1 to 3, wherein a target rotatable in an orthogonal direction is attached to the anchor in the tunnel as the target.

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