KR101280960B1 - Apparatus for measuring tunnel convergence displacements - Google Patents

Abstract

Disclosed is a tunnel displacement measuring apparatus. A device for measuring the internal displacement of the tunnel section, a pair of cameras coupled to the rail frame installed inside the tunnel along the tunnel section line, the carriage and the carriage moving along the rail frame, and photographing the tunnel section. Including, it is possible to represent the tunnel displacement in three-dimensional coordinates by using a photogrammetry technique.

Description

Apparatus for measuring tunnel convergence displacements

The present invention relates to a tunnel displacement measuring apparatus.

Tunnel measurement items include additional measurement items that are additionally measured according to the ground measurement conditions and daily measurement items that must be carried out for construction management. The essential items for the construction management of tunnels are the measurement of pore-displacement measurement and census settlement, and the main purpose is to measure the ground movement around tunnel and the displacement of tunnel walls.

On the other hand, while the tunnel is used after construction, measurement is made to continuously monitor the behavior of the tunnel in terms of glass management, which requires automatic measurement of tunnel hole displacement in terms of durability and stability of the tunnel.

Internal displacement measurement can be classified according to the type of sensor measuring the cross section and the measurement method of the generated displacement. Generally, the sensor is attached to the inside of the tunnel wall to measure the displacement and inclination, and the target is attached to the tunnel wall There is a method of measuring the displacement of the wall surface by the optical wave and photogrammetry, the method by the optical fiber sensor system. In addition, the above method can be reclassified into a method performed manually by light wave or photogrammetry and a method of automatically monitoring by attaching a sensor.

However, the sensors installed to automatically measure the internal displacement of tunnels measure displacement by the principle of electric resistance or vibration expression. These sensors are sensitive to temperature and humidity, and they can malfunction due to vibration or electromagnetic interference. There is a risk of causing the problem that can not meet the purpose of automatic measurement.

In addition, in the conventional method of measuring the internal displacement of a tunnel, it is difficult to obtain a fixed point that is a starting point of measurement and no displacement occurs. It is measured and expressed in two-dimensional coordinates. The measurement of relative distance change between tunnel walls cannot accurately measure the internal hole displacement of the tunnel. This is due to the fact that the reference point is a variable point located in the inner wall of the tunnel where the displacement is occurring. This results in accumulating measurement errors due to displacement of the reference point.

The present invention provides a tunnel pore displacement measuring apparatus and a tunnel pore displacement measuring method capable of representing tunnel pore displacement using three-dimensional spatial coordinates by using a photogrammetry technique.

The present invention also provides a tunnel hole displacement measuring apparatus and a tunnel hole displacement measuring apparatus which can represent the hole displacement of the tunnel in three-dimensional coordinates with respect to a fixed point derived from the outside of the relaxed region of the tunnel does not occur displacement.

According to an aspect of the present invention, an apparatus for measuring the internal displacement of the tunnel cross section, comprising: a rail frame installed inside the tunnel along the tunnel cross section line; A carriage moving along the rail frame; And a pair of cameras coupled to the carriage and including a pair of cameras photographing the tunnel cross section.

The tunnel pore displacement measuring apparatus may further include a plurality of photographing targets that are set at predetermined intervals along the tunnel cross-section line on the tunnel inner wall and photographed by a pair of cameras.

A reference hole may be drilled from the inner wall of the tunnel to the outside of the relaxation region of the tunnel, in which case a pipe is inserted into the reference hole so that one end reaches the outside of the relaxation region; The apparatus may further include a reference chuck including a reference rod inserted into the pipe and fixed to one end of the pipe so that one end thereof is positioned in the relaxation region.

And, it is coupled to the other end of the reference bar, it may further include a plate on which the known point target is set.

Further racks may be provided along the rail frame, in which case the carrier includes: a pinion gear meshed with the rack; A motor for providing rotational force to the pinion gear; And it may include an encoder for measuring the amount of rotation of the rotating shaft of the motor.

The camera may be a CCD camera.

The pair of cameras may be arranged to be perpendicular to the tunnel cross-sectional line.

According to another aspect of the present invention, three or more known point photographing targets and a plurality of unknown point photographing targets are sequentially set along the cross-sectional line of the tunnel, and the internal displacement of the tunnel section is measured using a pair of cameras. In one embodiment, a pair of cameras simultaneously captures at least three or more known point capture targets and at least one unknown point target among unknown shot targets to generate two image data, and then generates two image data. A first step of generating three-dimensional coordinates of the captured unknown point photographing target; A second step of setting the unknown shooting target in which the three-dimensional coordinates are generated as the known shooting target; And a third step of repeatedly performing the first step and the second step as the pair of cameras are moved along the tunnel cross section line.

The reference hole is drilled from the inner wall of the tunnel to the outside of the relaxation region of the tunnel, and one end of the pipe is inserted into the reference hole so that one end reaches the outside of the relaxation region and the pipe is inserted into the pipe so that one end is located in the relaxation region. A reference chuck including a reference rod fixed to the reference hole may be inserted into the reference hole. In this case, any one of three or more known point photographing targets may be derived from the other end of the reference rod.

The pair of cameras may be arranged to be perpendicular to the tunnel cross-sectional line.

According to an embodiment of the present invention, by using a photogrammetry technique can be represented in three-dimensional coordinates the tunnel displacement.

In addition, it is possible to represent the internal displacement of the tunnel in three-dimensional coordinates with respect to a fixed point derived from the outside of the relaxed region of the tunnel and no displacement occurs.

1 is a conceptual diagram of a tunnel displacement measurement apparatus according to a first embodiment of the present invention.
2 is a cross-sectional view of the tunnel displacement measurement apparatus according to a first embodiment of the present invention.
3 is a cross-sectional view of the reference chuck of the tunnel displacement measuring apparatus according to the first embodiment of the present invention.
Figure 4 is a cross-sectional view of the tunnel displacement measurement apparatus according to a second embodiment of the present invention.
5 is a cross-sectional view of the tunnel displacement measurement apparatus according to a third embodiment of the present invention.
Figure 6 is a flow chart of the tunnel displacement measurement method according to a fourth embodiment of the present invention.
7 and 8 are views for explaining a tunnel internal displacement measurement method according to a fourth embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, embodiments of a tunnel pore displacement measuring apparatus and a tunnel pore displacement measuring method according to the present invention will be described in detail with reference to the accompanying drawings. In the following description with reference to the accompanying drawings, the same or corresponding components are the same drawings. The numbering and duplicate description thereof will be omitted.

1 is a block diagram of a tunnel hole displacement measurement apparatus according to a first embodiment of the present invention, Figure 2 is a cross-sectional view of the tunnel hole displacement measurement apparatus according to a first embodiment of the present invention, Figure 3 is a third embodiment of the present invention Fig. 1 shows the installation state of the reference chuck of the tunnel displacement measuring apparatus according to the embodiment.

1 to 3, the tunnel cross-section line 12, the relaxation region 14, the rail frame 16, the carriage 18, the pipe 20, the reference hole 21, the reference rod 22, Reference chuck 24, fixing part 26, plate 28, shooting target 30, camera 32, rack 34, body 36, pinion gear 38, motor 40, roller 42, the camera support 43 is shown.

The tunnel pore displacement measuring apparatus according to the present embodiment is a device for measuring the pore displacement of a tunnel cross section, and includes a rail frame 16 and a rail frame 16 installed inside a tunnel along a tunnel cross section line 12. Including a carriage 18 coupled to the carriage 18 and a pair of cameras 32 coupled to the carriage 18 and photographing the tunnel cross section, the tunnel internal displacement can be represented in three-dimensional coordinates by using a photogrammetry technique. have.

The rail frame 16 is installed along the tunnel section line 12 inside the tunnel, and the carriage 18 on which the photographing unit to be described later is mounted is moved along the tunnel section line 12.

A tunnel means a passage through the ground for passage through roads, railways, waterways, etc., and means underground structures that are long in one direction. Therefore, the hole displacement is measured for tunnel sections at regular intervals for tunnels long in one direction. Here, the tunnel cross-section line 12 means a virtual line formed by the tunnel cross-section to measure the internal hole displacement.

The rail frame 16 may be installed along the tunnel cross-section line 12 corresponding to the tunnel shape. The rail frame 16 may be installed to maintain a predetermined distance from the tunnel inner wall or attached to the tunnel wall.

In the present embodiment, as the rail frame 16, an H-type steel provided with a flange facing the tunnel inner wall is used. In addition, various types of frames, such as I-type steel, channel type, hollow square, circular steel, and synthetic resin, may be used.

The carriage 18 moves along the rail frame 16, and a pair of cameras 32 are mounted to move the pair of cameras 32 along the tunnel cross-section line 12. The moving distance of the carriage 18 may be controlled by a controller (not shown).

The pair of cameras 32 are mounted on the carriage 18. As the carriage 18 moves, a pair of cameras 32 move along the tunnel cross-section line 12 and a pair of cameras 32 photograph a point in the tunnel cross section. The pair of cameras 32 acquires two images by photographing a point of the tunnel cross section, and image data corresponding to the two images is generated through a controller (not shown). The two image data are processed to extract three-dimensional coordinates of a point of the tunnel cross section. The pair of cameras 32 may be a charge coupled device (CCD) camera 32.

Hereinafter, the tunnel displacement measurement apparatus according to the present embodiment will be described in detail with reference to FIGS. 1 to 3.

Referring to Figure 1, the loosening region 14 is a range that becomes somewhat loose due to the redistribution of ground reaction force around the tunnel when the tunnel is excavated in the ground. The ground in the loosening region 14 causes the tunnel to displace in an unstable state. The relaxation region 14 may be estimated by numerical analysis or by empirical rule.

The rail frame 16 may be installed along the tunnel cross-section line 12 corresponding to the tunnel cross-sectional shape. In this embodiment, the form using the H-type steel as the rail frame 16 is presented. The H-shaped steel may be bent in a semicircle or arch shape corresponding to the tunnel cross-sectional shape. In addition, it is also possible to install by assembling each other inside the tunnel by partially cutting it.

A rack 34 may be attached to the rail frame 16, and the carriage 18 may be provided with a pinion gear 38 engaged with the rack 34. In this embodiment, the rack 34 is attached to the flange of the H-shaped steel which faces the tunnel cross section in the longitudinal direction.

The photographing target 30 is set at regular intervals along the tunnel section line 12 to be measured on the tunnel inner wall and photographed by a pair of cameras 32 of the photographing unit. The photographing target 30 indicates a preset position of the tunnel inner wall to be photographed, and may be a fixture fixed to the tunnel inner wall or a mark displayed on the tunnel inner wall.

The shooting target 30 is a starting point of measurement and a known point shooting target (44, 46, 48 of FIG. 7), which is a fixed point without displacement, and a displacement is generated to be a target of measurement, and a known point shooting target (44, 46 and 48 may be divided into unknown point photographing targets 50 and 52 of which position coordinates are calculated.

The known point photographing target may be configured such that the coordinate does not change since there is substantially no displacement during the measurement period in measuring the internal displacement of the tunnel. However, the term 'the coordinates do not change substantially during the measurement period' means that the coordinates do not change substantially in consideration of the measurement error range and the displacement caused by the vibration around the tunnel.

In this embodiment, as shown in FIG. 3, the reference chuck 24 is used to select a fixed point at which no displacement occurs. The reference chuck 24 includes a pipe 20 and a reference rod 22 inserted into the pipe 20, such as a cantilever, and one end of which is fixed to one end of the pipe 20 by the fixing part 26. Comprise.

In the method of installing the reference chuck 24, first, the reference hole 21 is drilled from the inner wall of the tunnel to the outside of the relaxation region 14 of the tunnel, and the one end of the pipe 20 reaches the outside of the relaxation region 14. Insert the chuck 24. A grout may be injected between the outer surface of the reference chuck 24 and the reference hole 21 to fix the reference chuck 24.

Meanwhile, in order to select a fixed point at which no displacement occurs, the pipe 20 is drilled from the inner wall of the tunnel to the outside of the relaxed area 14 of the tunnel, and one end reaches the outside of the relaxed area 14. After inserting the grout into the outside of the pipe 20, and inserting the reference rod 22 into the pipe 20 so that one end is located outside the relaxation region 14, such as a cantilever (cantilever) It is also possible to fix it to one end of the pipe 20 by the government part 26.

One end of the reference rod 22 of the reference chuck 24 is located outside the relaxation region 14 of the tunnel, so that the position is fixed even if a displacement occurs due to the movement of the ground around the tunnel, thereby fixing the other end of the reference rod 22. Can be used as a dot.

On the other hand, in order to calculate the three-dimensional coordinates of the unknown point by the photogrammetry requires two or more cameras 32 and three or more known points, the coordinates can be known from the fixed point of the other end of the reference bar 22 A plate 28 having three or more photographing targets 30 formed thereon may be attached to the other end of the reference rod 22. As described above, three or more photographing targets 30 formed on the plate 28 and knowing coordinates from the fixed point of the other end of the reference rod 22 are called known photographing targets. On the other hand, when the three-dimensional coordinates of the unknown shooting target is calculated from the known shooting target derived from such a fixed point, this can also be known as the known shooting target because it is also known.

The known point photographing target may be disposed along the tunnel cross section line 12, and a plurality of unknown point photographing targets may be disposed along the tunnel cross section line 12 at a predetermined interval adjacent to the outermost known point photographing target.

Carriage 18 is the pinion gear 38 and the pinion gear 38 meshing with the rack 34 formed on the rail frame 16, the motor 40 to provide a rotational force to the pinion gear 38 and the rotation amount of the rotation shaft of the motor 40 It may include an encoder (not shown) to measure. In this case, the motor 40 is a concept including a geared motor 40 having a gear for reducing the amount of rotation of the rotating shaft of the motor 40. Since the rotation amount of the rotation shaft of the motor 40 can be measured by the encoder and thus the rotation amount of the pinion gear 38 can be known, the carriage 18 of the carriage 18 moving along the rack 34 of the rail frame 16 can be measured. The amount of movement can be controlled.

In order to move the carriage 18 to slide along the rail frame 16, the body 36 of the carriage 18 is supported by the lower portion of the flange facing the tunnel inner wall and rotates as the carriage 18 moves. ) May be provided, and a camera support 43 for supporting a pair of cameras 32 may be provided at an upper portion of the body 36 of the carriage 18. The camera support 43 supports the pair of cameras 32 so that the lens of the camera 32 faces the shooting target 30. The camera support 43 may be configured to adjust the direction of the camera 32 toward the shooting target 30 according to the installation position of the tunnel displacement measuring apparatus according to the present embodiment, and the pair of cameras 32 It can be configured to adjust the separation distance of the.

The pair of cameras 32 may be arranged in various forms so that the shooting target 30 can be simultaneously photographed, but in this embodiment, the virtual line formed by the pair of cameras 32 is a tunnel cross-sectional line 12. It presents the form arranged to be perpendicular to the.

A method of measuring the pore displacement of a tunnel using the tunnel pore displacement measuring apparatus according to the present embodiment will be described with reference to FIGS. 7 and 8 as follows. First, the first, second and third known point photographing targets 44, 46, and 48 formed on the plate 28 using a pair of cameras 32 installed on the rail frame 16 via the carriage 18. ) And the first unknown point photographing target 50 adjacent thereto are simultaneously photographed to obtain two images. Image data are generated for each of the two images, and three-dimensional spatial coordinates of the first unknown point photographing target 50 are extracted using the two image data.

Next, the second adjacent point photographing target 46, the third known point photographing target 48, the first unknown point photographing target 50, and the first unknown point photographing target 50 using the carriage 18. 2 A pair of cameras 32 are moved and photographed at the same time so that the unknown shooting target 52 is located on one screen. At this time, since the position of the first unknown point photographing target 50 is extracted as a three-dimensional table, the three-dimensional point of the second known point photographing target 46, the third known point photographing target 48, and the first unknown point photographing target 50 is obtained. Three-dimensional coordinates of the second unknown point imaging target 52 may be calculated from the coordinates. In this way, the three-dimensional coordinates of the unknown photographing target formed along the tunnel cross-section line 12 can be calculated while moving the pair of cameras 32 using the carriage 18. From these three-dimensional coordinates, it is possible to measure the hole displacement with respect to the front end surface of the tunnel.

4 is a cross-sectional view of the tunnel displacement measurement apparatus according to a second embodiment of the present invention. Referring to FIG. 4, the rail frame 16, the carriage 18, the shooting target 30, the camera 32, the rack 34, the body 36, the pinion gear 38, the motor 40, and a roller 42, the camera support 43 is shown.

In this embodiment, the H-shaped steel having a short web length is installed as the rail frame 16. The H-shaped steel is spaced apart from the tunnel inner wall at a predetermined distance so that the flange faces the tunnel inner wall. Unlike the first embodiment, the present embodiment can be applied when it is difficult to secure the focal length of the camera 32 due to the narrow space inside the tunnel.

The rail frame 16 is installed along the tunnel cross section line corresponding to the tunnel cross section shape. The rack 34 is attached along the lengthwise direction to the bottom of the lower flange.

Carriage 18 is the pinion gear 38 and the pinion gear 38 meshing with the rack 34 formed on the rail frame 16, the motor 40 to provide a rotational force to the pinion gear 38 and the rotation amount of the rotation shaft of the motor 40 It may include an encoder (not shown) to measure.

In order to move the carriage 18 to slide along the rail frame 16, the body 36 of the carriage 18 is supported by the lower flange of the H-shaped steel and rotated in accordance with the movement of the carriage 18 It may be provided. The pinion gear 38 is coupled to the body 36 to be engaged by being located under the rack 34 attached to the bottom of the lower flange. Both sidewalls of the body 36 of the carriage 18 are provided with a camera support 43 for supporting the pair of cameras 32. The camera support 43 supports the pair of cameras 32 so that the lens of the camera 32 faces the shooting target 30. The camera support 43 may move up and down along the side wall of the body 36 to adjust the focal length of the camera 32 with respect to the shooting target 30.

Since other components are as described above, a description thereof will be omitted.

5 is a cross-sectional view of the tunnel displacement measurement apparatus according to a third embodiment of the present invention. Referring to FIG. 5, the rail frame 16, the carriage 18, the shooting target 30, the camera 32, the rack 34, the body 36, the pinion gear 38, the motor 40, and a roller 42, connecting rod 58, rotating plate 60, rotating shaft 62 is shown.

This embodiment may also be applied when it is difficult to secure the focal length of the camera 32 due to the narrow space inside the tunnel as in the second embodiment.

In this embodiment, the H-shaped steel having a short web length is installed as the rail frame 16, and the upper flange is directly coupled to the tunnel inner wall 56. The upper flange may be wider than the lower flange to facilitate installation of the rail frame 16 to the tunnel inner wall 56. The rail frame 16 is installed spaced apart from the tunnel cross-section line in which the shooting target 30 is installed.

The rack 34 is attached along the longitudinal direction to the lower end of the lower flange of the H-shaped steel. In order to move the carriage 18 to slide along the rail frame 16, the body 36 of the carriage 18 is supported by the lower flange of the H-shaped steel and rotated in accordance with the movement of the carriage 18 It may be provided. The pinion gear 38 is coupled to the body 36 to be engaged by being located under the rack 34 attached to the bottom of the lower flange.

The lower end of the body 36 of the carriage 18 is coupled to the connecting rod 58 toward the tunnel cross-sectional line. Rotating plate 38 is coupled to the connecting rod 58 by a rotating shaft 62 to be located in the downward direction of the tunnel cross-section line. The rotating plate 60 is provided with a camera support 43 for supporting the pair of cameras 32. Since the rotation plate 60 is rotatable about the rotation shaft 62, the photographing direction of the pair of cameras 32 installed on the rotation plate 60 may be variously adjusted.

The camera support 43 supports the pair of cameras 32 so that the lens of the camera 32 faces the shooting target 30. The camera support 43 may be configured to adjust the direction of the camera 32 toward the shooting target 30, and may be configured to adjust the separation distance of the pair of cameras 32.

Since other components are as described above, a description thereof will be omitted.

6 is a flowchart illustrating a tunnel pore displacement measuring method according to a fourth exemplary embodiment of the present invention, and FIGS. 7 and 8 are views illustrating a tunnel pore displacement measuring method according to a fourth exemplary embodiment of the present invention. 7 and 8, the tunnel cross section line 12, the screen 33, the first known point photographing target 44, the second known point photographing target 46, the third known point photographing target 48, and the first The unknown point photographing target 50 and the second unknown point photographing target 52 are shown.

In the tunnel internal displacement measurement method according to the present embodiment, three or more known point photographing targets 44, 46, and 48 and a plurality of unknown point photographing targets 50. 52 are sequentially set along the cross section line of the tunnel. A method of measuring the hole displacement of a tunnel cross section using a pair of cameras, wherein the pair of cameras includes at least three or more known point shooting targets 44, 46, and 48 among the known point shooting targets 44, 46, and 48. Simultaneously photographing at least one or more unknown shooting targets 50 of the spot shooting targets 50 and 52 to generate two image data, and three-dimensional of the unknown shooting target 50 captured from the two image data. As the first step of generating the coordinates, the second step of setting the unknown point shooting target 50, the three-dimensional coordinates generated as a known point shooting target and a pair of cameras along the tunnel cross-section line 12, Repeat step 1 and step 2 A third step is performed.

 In the tunnel displacement measurement method according to the present embodiment, the tunnel displacement may be expressed in three-dimensional coordinates by using a photogrammetry technique, and the tunnel displacement is determined in three-dimensional coordinates based on a fixed point derived from outside the relaxed region of the tunnel. Can be represented.

In order to apply the tunnel hole displacement measurement method according to the present embodiment, three or more known point photographing targets 44, 46, 48 and a plurality of unknown point photographing targets 50, 52 along the tunnel cross-section line 12 on the tunnel inner wall. ) Should be installed sequentially.

To calculate the three-dimensional coordinates of an unknown point by photogrammetry, two or more cameras and three or more known points are required. Accordingly, the tunnel cross-section line includes three or more known point photographing targets 44, 46 and 48 whose coordinates are known in advance on the inner wall of the tunnel and a plurality of unknown point photographing targets 50 and 52 which are set to measure the internal displacement of the tunnel. Set sequentially according to (12).

In this embodiment, as shown in Figure 7 and 8, the first known point shooting target 44, the second known point shooting target 46, the third known point shooting target 48 and the third known point shooting target 48 A method of measuring the tunnel internal displacement will be described with respect to the case where the first to Nth unknown photographing targets 50 and 52 are set to be adjacent to. Here, N means an integer of N> 1.

Referring to Figures 7 and 8, it will be described in the tunnel displacement measurement method according to the present embodiment. First, as a first step, a pair of cameras photograph the first to third known point photographing targets 44, 46 and 48 and the first unknown point photographing target 50 simultaneously to generate two image data, and two Three-dimensional coordinates of the first unknown point photographing target 50 photographed from the two pieces of image data are generated (S100). That is, the first to third known point photographing targets 44, 46 and 48 and the third known point photographing target 48 are adjacent to the screen 33 of the camera 32 using the pair of cameras 32. The first unknown point photographing target 50 is photographed at the same time so as to obtain two image data. Three-dimensional coordinates of the first unknown photographing target 50 may be generated from two image data and three known points.

Next, as a second step, the first unknown point photographing target 50 in which three-dimensional coordinates are generated is set as a known point photographing target (S200). Since the spatial coordinates of the first unknown point photographing target 50 can be known by the first step S100, the first unknown point photographing target 50 is set as a new known point photographing target. Therefore, a total of four known point photographing targets can be set by this step.

Next, as the pair of cameras are moved along the tunnel cross-section line 12, the first step and the second step are repeatedly performed (S300). As shown in FIG. 8, a second non-point adjacent to the second known point shooting target 46, the third known point shooting target 48, the first unknown point shooting target 50, and the first unknown point shooting target 50. The pair of cameras are moved along the tunnel cross-section line 12 so that the point photographing target 52 is positioned on one screen 33, and simultaneously photographed using a pair of cameras to obtain two image data. At this time, since the position of the first known point photographing target 44 is extracted in three-dimensional coordinates, the spatial coordinates of the second known point photographing target 46, the third known point photographing target 48, and the first unknown point photographing target 50 are used. The spatial coordinates of the second unknown point photographing target 52 can be calculated. Therefore, in this step, a total of five known point photographing targets may be set.

By moving the pair of cameras along the tunnel cross-section line 12 in the above manner, the first and second steps may be repeatedly performed to calculate three-dimensional spatial coordinates of N unknown photographing targets. Can be. In order to reduce the error due to the repeated measurement, the three-dimensional coordinates of each shooting target may be set while moving a pair of cameras in the direction opposite to the camera movement direction in the above step.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

Many embodiments other than the above-described embodiments are within the scope of the claims of the present invention.

12: tunnel cross section line 14: relaxation area
16: rail frame 18: carriage
20: pipe 21: reference hole
22: reference bar 24: reference chuck
26: fixing part 28: plate
30: shooting target 32: camera
34: rack 36: body
38: pinion gear 40: motor
42: roller 43: camera support
44, 46, 48: known point shooting target 50, 52: unknown point shooting target
56: tunnel inner wall 58: connecting rod

Claims (7)

A device for measuring the displacement of holes in tunnel sections,
A rail frame installed inside the tunnel along the tunnel section line;
A carriage moving along the rail frame; And
A pair of cameras coupled to the carriage and photographing the tunnel cross section;
The reference hole is drilled from the inner wall of the tunnel to the outer side of the relaxed area of the tunnel,
A reference chuck including a pipe inserted into the reference hole so that one end reaches the outside of the relaxation region, and a reference rod inserted into the pipe.
The reference rod,
An outer surface of the reference rod is inserted into the pipe so as to be spaced apart from an inner surface of the pipe, and one end of the reference rod is fixed to one end of the pipe positioned outside the relaxation region so that one end of the reference rod is fixed to the outside of the relaxation region and The other end of the reference rod is a free end is fixed in the form of a cantilever in the inside of the pipe, the other end of the reference rod is characterized in that the hole displacement measurement device, characterized in that forming a fixed point.
The method of claim 1,
And a plurality of photographing targets set on the tunnel inner wall along the tunnel section line and photographed by the pair of cameras.
delete The method of claim 1,
It is coupled to the other end of the reference rod, tunnel deflection measurement apparatus further comprises a plate is set a known point shooting target.
The method of claim 1,
The rack is provided along the rail frame,
The carriage,
A pinion gear meshed with the rack;
A motor providing a rotational force to the pinion gear; And
Tunnel internal displacement measurement apparatus comprising an encoder for measuring the amount of rotation of the rotating shaft of the motor.
The method of claim 1,
The camera is a tunnel displacement measuring apparatus, characterized in that the CCD camera.
The method of claim 1,
And the pair of cameras are arranged to be perpendicular to the tunnel cross-sectional line.

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