Conduit tunnel displacement monitoring system

Abstract

To enable easy monitoring of displacement of a conduit tunnel.SOLUTION: A displacement monitoring system is provided, comprising multiple reflective members fixed onto an inner wall of a conduit tunnel, and an image capturing device fixed onto the inner wall of the conduit tunnel to capture images of the multiple reflective members.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a displacement monitoring system for a conduit tunnel. [Background technology]

[0002] For example, Patent Document 1 discloses a technique for measuring the displacement of a tunnel. In the technique described in Patent Document 1, shape measurement devices each having a laser scanner are placed at a plurality of positions spaced apart along the tunnel axis, which is the extension direction of the tunnel. An inspector then causes each of the shape measurement devices to measure the circumferential shape of the tunnel's inner wall.

[0003] The tunnel displacement measurement device described in Patent Document 1 acquires, from a communication unit, multiple pieces of circumferential shape data transmitted from a shape measurement device. The circumferential shape data is 3D point cloud data that indicates the circumferential shape of the tunnel with multiple 3D points, and includes data on multiple 3D points. The data on each 3D point includes data indicating the 3D position of the 3D point.

[0004] The tunnel displacement measuring device compares the circular shape data with reference shape data that represents the overall shape of the tunnel as a three-dimensional point cloud, and measures the displacement of the tunnel based on the comparison results. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2020-197459 Summary of the Invention [Problem to be solved by the invention]

[0006] In general, in conduit tunnels where communication cables, power cables, gas pipes, water and sewerage pipes, etc. are installed inside, it is necessary to monitor their displacement in order to detect cracks early or prevent their occurrence.

[0007] In the technology described in Patent Document 1, the tunnel displacement measuring device processes a plurality of pieces of circular shape data (three-dimensional point data), which may result in a large amount of processing and a large processing load.

[0008] One of the objectives of the present disclosure is to easily monitor displacement of a pipeline tunnel. [Means for solving the problem]

[0009] The displacement monitoring system according to the present disclosure comprises: a plurality of reflective members fixed to an inner wall of the conduit tunnel; and an imaging device that is installed at a fixed position within the conduit tunnel and captures images of the plurality of reflective members. [Effects of the Invention]

[0010] According to the present disclosure, displacement of a pipeline tunnel can be easily monitored. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a diagram illustrating a configuration example of a displacement monitoring system according to an embodiment of the present disclosure. [Figure 2] FIG. 10 is a diagram illustrating an example of the arrangement of multiple reflective members in a conduit tunnel according to an embodiment of the present disclosure. [Figure 3] 10A to 10C are diagrams illustrating an example of a flow of a method for arranging a plurality of reflective members in a conduit tunnel according to an embodiment of the present disclosure. [Figure 4] FIG. 1 is a side view of an example of a reflective member 110 according to an embodiment of the present disclosure. [Figure 5] 10 is a flowchart illustrating an example of operation of an imaging control device according to an embodiment of the present disclosure. [Figure 6] 10 is a flowchart illustrating an example of an operation of a management device according to an embodiment of the present disclosure. [Figure 7] FIG. 1 is a diagram illustrating an example of the physical configuration of an imaging control device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The same elements are designated by the same reference numerals throughout the drawings. Furthermore, terms indicating directions such as front, back, up, down, left, and right are used for the purpose of explanation only and are not intended to limit the present invention.

[0013] Furthermore, throughout the text, "equal" means "substantially equal." That is, for example, when A and B are "equal," even if there is a difference between A and B in the strict sense, the difference is within a predetermined range. Such a predetermined range is, for example, the range of error that may normally occur in construction, manufacturing, measurement, etc., but may be determined as appropriate.

[0014] (Overall configuration of displacement monitoring system 100) A displacement monitoring system 100 according to an embodiment of the present disclosure is a system for monitoring the displacement of a conduit tunnel T. The displacement monitoring system 100 includes a plurality of reflecting members 110, an imaging device 120, an imaging control device 130, and a management device 140, as shown in an example configuration in FIG.

[0015] The photographing device 120, the photographing control device 130, and the management device 140 are connected to one another via a communication network NT. As a result, the photographing device 120, the photographing control device 130, and the management device 140 transmit and receive information to and from one another via the communication network NT. The communication network NT may be configured as, for example, a wired network, a wireless network, or a combination of these.

[0016] Note that it is sufficient that at least the imaging device 120 and the imaging control device 130, and the imaging control device 130 and the management device 140 are connected by a communication network so that they can transmit and receive information to and from each other. Furthermore, the communication network connecting these different combinations of devices may be a communication network with different communication methods, for example.

[0017] (About Pipe Tunnel T) The "pipe tunnel" T is a tunnel for burying underground the equipment that makes up the lifeline. Inside the pipe tunnel T, communication cables, power cables, gas pipes, water and sewerage pipes, etc. are laid as equipment that makes up the lifeline.

[0018] The size of the internal space of the pipeline tunnel T is, for example, a cross-sectional area of ​​2 m 2 (square meters) or more. The size of the internal space of the conduit tunnel T may be, for example, approximately 1.65 m to 5.0 m in width and approximately 2.1 m to 5.0 m in height. In particular, typical examples of the shape of the internal space of the conduit tunnel T are roughly rectangular, circular, elliptical, etc. In the case of a conduit tunnel whose internal space is rectangular, the size of the internal space may be, for example, approximately 1.65 m in width and 2.1 m in height, or approximately 4.7 m in width and 3.65 m in height. In the case of a conduit tunnel T whose internal space is circular, the size of the internal space may be, for example, an inner diameter of approximately 2.2 m to 5.0 m.

[0019] It should be noted that the shapes and sizes of the internal space of the conduit tunnel T given here are merely examples, and are not intended to limit the conduit tunnel T to these.

[0020] (Regarding the reflective member 110) Each of the multiple reflecting members 110 is fixed to the inner wall of the conduit tunnel T. Each of the multiple reflecting members 110 reflects light, for example, toward the imaging device 120. The light received by the reflecting member 110 is light emitted by a light 122, which will be described later, but is not limited to this. For example, the light received by the reflecting member 110 may be light emitted from a light or the like provided in the conduit tunnel T.

[0021] An example of the arrangement of the plurality of reflecting members 110 in the conduit tunnel T and an example of the configuration of each of the reflecting members 110 will be described below.

[0022] (Example of arrangement of multiple reflecting members 110 in conduit tunnel T)

[0023] Fig. 2 is a diagram showing an example of the arrangement of a plurality of reflecting members 110 in a conduit tunnel T. Fig. 2(a) is a diagram showing an example of the conduit tunnel T as seen from above. Fig. 2(a) is a diagram showing examples of common cross sections CS1 to CSN defined along the extension direction of the conduit tunnel T. Fig. 2(b) is a diagram showing an example of the arrangement of reflecting members 110Gia to 110Gid in the common cross sections CSi.

[0024] Here, N is an integer equal to or greater than 1, and the same applies hereinafter. i is an integer equal to or greater than 1 and equal to or less than N, and the same applies hereinafter.

[0025] An example of the arrangement of the plurality of reflecting members 110 in the conduit tunnel T will be described with reference to FIG. 2 as needed.

[0026] The plurality of reflecting members 110 constitute one or more reflecting member groups G1 to GN. Each of the one or more reflecting member groups G1 to GN is made up of a plurality of reflecting members 110.

[0027] For example, one or more reflective member groups G1 to GN may be associated with one or more common cross sections CS1 to CSN, respectively. In this case, one or more reflective member groups G1 to GN are composed of a plurality of reflective members 110 arranged at one or more common cross sections CS1 to CSN predetermined for the conduit tunnel T, respectively.

[0028] The number of reflecting members 110 constituting each of one or more reflecting member groups G1 to GN is preferably four or more in order to accurately monitor the displacement of the conduit tunnel T, but may be one to three. The number of reflecting members 110 constituting each of the multiple reflecting member groups G1 to GN may be the same or different.

[0029] 2(b) shows an example in which the reflective member group Gi is composed of a plurality of reflective members 110Gia to 110Gid arranged in the common cross section CSi of the conduit tunnel T. In detail, for example, the plurality of reflective members 110Gia to 110Gid corresponding to the common cross section CSi may be fixed to an inner wall located in the common cross section CSi of the conduit tunnel T. The plurality of reflective members 110Gia to 110Gid corresponding to the common cross section CSi may be fixed to the inner wall of the conduit tunnel T so as to be located in the common cross section CSi of the conduit tunnel T.

[0030] (For one or more common cross sections CS1 to CSN) Each of the one or more common cross sections CS1 to CSN is a cross section of the conduit tunnel T that is determined appropriately.

[0031] Each of the one or more common cross sections CS1 to CSN is, for example, a plane that intersects with the extension direction of the conduit tunnel T. The angle at which each of the one or more common cross sections CS1 to CSN intersects with the extension direction of the conduit tunnel T may be a predetermined angle. In detail, for example, the angle at which each of the one or more common cross sections CS1 to CSN intersects with the extension direction of the conduit tunnel T may be 90 degrees. In this case, each of the one or more common cross sections CS1 to CSN is a cross section that is perpendicular to the extension direction of the conduit tunnel T.

[0032] At least one of the one or more common cross sections CS1 to CSN may be defined in a portion where the conduit tunnel T curves along the extension direction. In this case, the one or more reflective member groups include at least one reflective member group arranged in a portion where the conduit tunnel T curves along the extension direction. In Fig. 2(b), the reflective member group Gi is an example of a reflective member group arranged in a portion of the conduit tunnel T where the conduit tunnel curves along the extension direction.

[0033] (When there are multiple common cross sections CS1 to CSN) The plurality of common cross sections CS1 to CSN may be, for example, a plurality of cross sections along the extension direction of the conduit tunnel T.

[0034] For example, the multiple common cross sections CS1 to CSN may be defined at equal distance intervals along the extension direction of the conduit tunnel T. In this case, the multiple reflective member groups G1 to GN are arranged at each of the multiple common cross sections CS1 to CSN defined at equal distance intervals along the extension direction of the conduit tunnel T. This distance interval may be determined in advance as appropriate.

[0035] The angles at which each of the multiple common cross sections CS1 to CSN intersects with the extension direction of the conduit tunnel T may be equal to or different from each other.

[0036] When a plurality of common cross sections CS1 to CSN are defined, a plurality of reflective member groups G1 to GN are arranged in each of the common cross sections CS1 to CSN. The plurality of reflective member groups G1 to GN may each have a different number of reflective members 110.

[0037] (Example of arrangement of the reflective member group Gi corresponding to the common cross section CSi)

[0038] The plurality of reflecting members 110 constituting each of one or more reflecting member groups G1 to GN may be arranged in the corresponding common cross section CSi in an appropriate manner or method.

[0039] For example, in at least some of the reflecting member groups G1 to GN, the reflecting members 110 constituting each of the at least some reflecting member groups may be arranged at equal intervals on a common cross section. The equal intervals may be equal angular intervals, equal distances, or the like.

[0040] "Equal angular intervals" means that in the reflecting member group Gi, the angles θ formed by the line segments connecting the center (center of gravity) of the common cross section CSi and adjacent reflecting members 110 are equal. "Equal distances" also means that the distances between adjacent reflecting members 110 in the reflecting member group Gi are equal. The distances between the reflecting members 110 may be, for example, the linear distance between the reflecting members 110, the distance along the common cross section CSi between the reflecting members 110, etc.

[0041] 2(b), the plurality of reflecting members 110Gia to 110Gid constituting the reflecting member group Gi are an example of reflecting members 110 arranged at equal angular intervals of 90 degrees. In the example of the same figure, the common cross section CSi is circular, so the plurality of reflecting members 110Gia to 110Gid constituting the reflecting member group Gi are also an example of reflecting members 110 arranged at equal distances. Also, the same figure shows an example in which the reflecting members 110Gia and 110Gic are arranged in the horizontal direction, and the reflecting members 110Gib and 110Gid are arranged in the vertical direction. The plurality of reflecting members 110Gia to 110Gid constituting the reflecting member group Gi do not have to be arranged along the vertical direction or the horizontal direction.

[0042] (Regarding the reference reflective member and secondary reflective member) Each of the plurality of reflecting member groups G1 to GN includes, for example, at least one reference reflecting member. The reference reflecting member is one of the plurality of reflecting members 110 constituting each of the reflecting member groups G1 to GN, which is arranged at predetermined intervals along the extension direction of the conduit tunnel T.

[0043] Each of the plurality of reflecting member groups G1 to GN may include a sub-reflecting member. The sub-reflecting member is a reflecting member 110 other than the reference reflecting member among the plurality of reflecting members 110 constituting each of the reflecting member groups G1 to GN. In other words, the sub-reflecting member for a reflecting member group Gi is a reflecting member 110 that is arranged on the same common cross section CSi as the reflecting member group Gi. There may be one or more sub-reflecting members.

[0044] As described above, the plurality of reflecting member groups G1 to GN may each have a different number of reflective members 110. In this case, at least one of the plurality of reflecting member groups G1 to GN has a different number of sub-reflective members from the other reflecting member groups.

[0045] (Example of arrangement of multiple reflecting members 110) FIG. 3 is a diagram showing an example of the flow of a method for arranging a plurality of reflecting members 110 in the conduit tunnel T.

[0046] The reference reflecting members included in each of the plurality of reflecting member groups G1 to GN are arranged at predetermined intervals along the extension direction of the conduit tunnel T (step 1).

[0047] For each of the plurality of reflecting member groups G1 to GN, a sub-reflecting member is arranged on the same common cross section as the reference reflecting member arranged in step 1 (step 2). At this time, the sub-reflecting members are preferably arranged so that the plurality of reflecting members 110 arranged on the same common cross section as the sub-reflecting member are spaced at predetermined intervals. The predetermined intervals are, for example, equal intervals, but are not limited to this.

[0048] More specifically, for example, it is assumed that the reflecting member group Gi is made up of a plurality of reflecting members 110Gia to 110Gid as shown in Fig. 2. It is also assumed that the reflecting member 110Gia is the reference reflecting member. In this case, the secondary reflecting members are the reflecting members 110Gib to 110Gid.

[0049] In step 1, for example, a reference reflecting member 110Gia included in a certain reflecting member group Gi is placed at a predetermined position in the pipeline tunnel T. Then, reference reflecting members 110Gia included in other reflecting member groups Gj are placed at predetermined intervals along the extension direction of the pipeline tunnel T, using the reference reflecting member 110Gia of the already placed reflecting member group Gi as a reference. Here, j is an integer from 1 to N excluding i.

[0050] More specifically, for example, of the multiple reflecting member groups G1 to GN, the reference reflecting member 110G1a included in the reflecting member group G1 that is arranged at the end along the extension direction of the pipeline tunnel T may be arranged at a predetermined position in the pipeline tunnel T. Then, the reference reflecting members 110G2a to GNa included in the reflecting member groups G2 to GN may be arranged in order along the extension direction of the pipeline tunnel T using the reference reflecting member 110G1a as a reference.

[0051] In step 1, the reference reflecting members 110GNa to 110GNa included in the plurality of reflecting member groups G1 to GN are arranged along the direction in which the conduit tunnel T extends.

[0052] In step 2, for example, for each of the plurality of reflecting member groups G1 to GN, sub-reflecting members 110Gib to 110Gid are arranged on the corresponding common cross section CSi using the reference reflecting member 110Gia arranged in step 1 as a reference.

[0053] In step 2, the sub-reflecting members 110Gib to 110Gid included in the plurality of reflecting member groups G1 to GN are arranged along the extension direction of the conduit tunnel T, and the arrangement of the plurality of reflecting members 110 is completed.

[0054] The method of arranging the plurality of reflecting members 110 in the conduit tunnel T is not limited to the method described here.

[0055] For example, when each of the plurality of reflecting member groups G1 to GN is composed of the same number of reflecting members 110, and the reflecting members 110 are arranged at equal intervals in each of the common cross sections CS1 to CSN, a certain reflecting member group Gi may be arranged in a predetermined common cross section CSi. Then, using each of the plurality of reflecting members 110Gia to 110Gid constituting the reflecting member group Gi arranged in the common cross section CSi as a reference, the plurality of reflecting members 110Gia to 110Gid constituting the other reflecting member group Gj may be arranged at predetermined intervals along the extension direction of the conduit tunnel T.

[0056] For example, when there is one group of reflecting members, one of the reflecting members 110 constituting the group of reflecting members may be placed at a predetermined position in the conduit tunnel T. Then, the other reflecting members 110 may be placed, for example, on a predetermined common cross section using the one reflecting member 110 that has already been placed as a reference, so that the plurality of reflecting members 110 are spaced at predetermined intervals (for example, equal intervals).

[0057] (Configuration of Reflection Member 110) FIG. 4 is a side view of an example of the reflecting member 110.

[0058] Each of the plurality of reflecting members 110 includes, for example, a reflecting portion 111, a container 112, a light-transmitting portion 113, a heater 114, and a fixing member 115, as shown in the figure.

[0059] The reflecting unit 111 is a member that reflects light. The reflecting unit 111 reflects light, for example, toward the image capturing device 120. A retroreflector is suitably used for the reflecting unit 111. A retroreflector is an optical member that reflects incident light parallel to its optical axis and in the opposite direction of the incident light. A retroreflector is, for example, a corner cube prism with an area where light enters and exits, of approximately 35 mm (millimeters) to 40 mm, but is not limited to this. The reflecting unit 111 is not limited to a retroreflector and may be, for example, a mirror or the like. The size of the reflecting unit 111 may be changed as appropriate.

[0060] The container 112 is a member that houses the reflecting unit 111 inside. The container 112 may have a shape that is at least partially open so that the incident and exiting light of the reflecting unit 111 can pass through, for example. The container 112 is a cylindrical shape with one open end and a bottom, and is typically a cylindrical shape with a circular cross section along its axial direction. Note that the container 112 may also be a cylindrical shape with an appropriate cross section, such as a rectangular cylindrical shape with a square cross section along its axial direction.

[0061] Container 112 is, for example, a cube with sides of approximately 10 cm (centimeters), but the size and shape are not limited to this. Container 112 is, for example, made of metal or resin, but the material is not limited to these. Container 112 may also be composed of multiple parts made of different materials.

[0062] The light-transmitting portion 113 is fixed to the container 112 and is a member through which light entering and exiting the reflector passes. The light-transmitting portion 113 is, for example, a member having light-transmitting properties. The light-transmitting portion 113 may be made of, for example, a material such as resin or glass. The light-transmitting portion 113 is, for example, a flat plate having an appropriate shape such as a circle or a rectangle, but the shape is not limited to these.

[0063] For example, the light-transmitting portion 113 is fixed to the container 112 so as to close the open portion of the container 112. The light-transmitting portion 113 may be fixed so as to seal the inside of the container 112 in which the reflecting portion 111 is arranged. The degree to which the light-transmitting portion 113 seals the inside of the container 112 is, for example, liquid-tight or airtight, but is not limited to these.

[0064] Here, liquid-tightness refers to a degree of sealing that makes it difficult for liquid such as water to penetrate into container 112. By fixing light-transmitting portion 113 to reflecting portion 111 in a liquid-tight manner, it is possible to reduce the possibility that reflecting portion 111 will not be able to reflect light sufficiently due to, for example, light-transmitting portion 113 (particularly the inner surface of light-transmitting portion 113) or reflecting portion 111 (particularly the portion through which incident light and reflected light pass) becoming wet.

[0065] Here, "sufficient light" means light that can identify the position of the pipeline tunnel T with sufficient accuracy from the image captured by the imaging device 120 to observe its displacement, and the same applies hereinafter.

[0066] Furthermore, airtightness refers to a degree of sealing that makes it difficult for gas to enter the inside of container 112. By airtightly fixing light-transmitting portion 113 to reflecting portion 111, it is possible to reduce the possibility that reflecting portion 111 will not be able to reflect enough light due to, for example, condensation on light-transmitting portion 113 (particularly the inner surface of light-transmitting portion 113) or reflecting portion 111 (particularly the portion through which incident light or reflected light passes).

[0067] The heater 114 is a heating element for heating the container 112 and is attached to the container 112 .

[0068] For example, the heater 114 includes an electric heating wire and heats the reflecting portion 111 using power supplied from an appropriate power source in the conduit tunnel T.

[0069] For example, when the container 112 is cylindrical, the heater 114 may be attached to the container 112 by wrapping it around a part or all of the outer circumferential surface. Preferably, the heater 114 is attached to the container 112 so as to be in intimate contact with the outer circumferential surface.

[0070] Generally, the environment inside the pipeline tunnel T can be high in humidity and low in temperature. Furthermore, the reflective member 110 is used to observe the displacement of the pipeline tunnel T by identifying its position from an image captured by the imaging device 120, as will be described in detail later. For this reason, the reflective member 110 remains in the environment inside the pipeline tunnel T for a long period of time.

[0071] Even if the open portion of the container 112 is closed by blocking the light-transmitting portion 113 as described above to seal the inside of the container 112, moisture may enter the inside of the container 112, causing condensation and clouding, which may prevent the reflecting portion 111 from reflecting enough light.

[0072] Heater 114 heats container 112, thereby preventing reflecting section 111 provided inside container 112 from becoming cloudy due to condensation.

[0073] The fixing member 115 is a member for fixing the container 112, to which the reflecting portion 111, the light-transmitting portion 113, and the heater 114 are attached, to the inner wall of the pipeline tunnel T. The fixing member 115 may have an appropriate shape such as a straight line or an L-shape. For example, one end of the fixing member 115 may be fixed to the container 112, and the other end may be fixed to the inner wall of the pipeline tunnel T.

[0074] The fixing member 115 and the container 112 may be configured as an integral unit, or may be fixed using a fastener such as a screw. The fixing member 115 and the inner wall of the pipeline tunnel T may be fixed using a fastener such as a bolt. The reflecting member 110 is disposed in the pipeline tunnel T by fixing the container 112, to which the reflecting portion 111, the light-transmitting portion 113, and the heater 114 are attached, to the inner wall of the pipeline tunnel T.

[0075] The fixing member 115 may be composed of a plurality of parts, such as a member fixed to the inner wall of the pipeline tunnel T (for example, a member fixed at a position that forms the chord of the common cross section CSi when the common cross section CSi is circular), and a member having one end fixed to the member and the other end fixed to the container 112. Also, the reflecting member 110 may not include the fixing member 115, and the container 112 may be directly fixed to the inner wall of the pipeline tunnel T using a fastener such as a bolt.

[0076] (Regarding the imaging device 120, imaging control device 130, and management device 140) The photographing device 120 photographs the plurality of reflecting members 110 arranged in the pipeline tunnel T.

[0077] The imaging control device 130 generates analysis data including the positions of the multiple reflecting members 110 included in the image captured by the imaging device 120 in the image.

[0078] The management device 140 manages the displacement of the conduit tunnel T based on the generated analysis data.

[0079] For example, the imaging device 120 and the imaging control device 130 are installed in the pipeline tunnel T, and the management device 140 is installed in, for example, a management center that manages the pipeline tunnel T. The imaging device 120 and the imaging control device 130 may operate using power supplied from an appropriate power source in the pipeline tunnel T. This power source may be, for example, a power source common to the heater 114. In other words, the imaging control device 130 and the heater 114 may each be supplied with power from a common power source.

[0080] Hereinafter, detailed examples of the imaging device 120, imaging control device 130, and management device 140 will be described.

[0081] (Regarding the imaging device 120) The photographing device 120 includes a photographing section 121 and a light 122, as shown in FIG.

[0082] The photographing unit 121 is, for example, a camera such as an infrared camera or a visible light camera. The photographing unit 121 may be installed at a predetermined fixed position inside the pipeline tunnel T so as to be able to photograph the multiple reflective members 110. The photographing unit 121 may be fixed to the inner wall of the pipeline tunnel T using fasteners such as bolts. The photographing unit 121 may be fixed to the inner wall of the pipeline tunnel T by being fixed to an auxiliary member fixed to the inner wall of the pipeline tunnel T. The auxiliary member is, for example, a metal rack, a straight rod, an L-shaped rod, or a combination of these. Note that the auxiliary member may be made of any suitable material and have any suitable shape as long as it is a member having the rigidity to fix the photographing unit 121.

[0083] The photographing unit 121 may photograph at a predetermined photographing interval. This generates an image including a plurality of reflecting members 110 photographed at the photographing interval. This photographing interval may be a predetermined appropriate time interval, such as 1 / 60 seconds, 1 / 40 seconds, 1 / 30 seconds, or one to several minutes.

[0084] The photographing device 120 may photograph some of the multiple reflective members 110, or may photograph all of the multiple reflective members 110. There may be multiple photographing devices 120. In this case, the multiple photographing devices 120 may be installed in the pipeline tunnel T so that the multiple photographing units 121 included in each of them can photograph some or all of the multiple reflective members 110. The image photographed by the photographing device 120 includes at least some of the multiple reflective members 110. If the photographing device 120 is a visible light camera, the image photographed by the photographing device 120 can be used to confirm the situation inside the pipeline tunnel T other than the reflective members 110.

[0085] The lighting 122 irradiates light onto the reflecting member 110 arranged in the pipeline tunnel T. The lighting 122 may irradiate light according to the imaging unit 121, i.e., infrared light if the imaging unit 121 is an infrared camera, or visible light if the imaging unit 121 is a visible light camera. The lighting 122 only needs to be on at least when the imaging unit 121 is taking an image, and may be on all the time, for example.

[0086] Although not shown, appropriate lighting may be provided in the pipeline tunnel T so that sufficient light is reflected from the reflecting member 110. Generally, lighting is provided for work in the pipeline tunnel T. Of course, such lighting can be turned on all the time to provide the light that is irradiated onto the reflecting member 110. In cases where sufficient light can be obtained without the lighting 122, the imaging device 120 does not need to include the lighting 122.

[0087] (Regarding the imaging control device 130) The imaging control device 130 communicates with the imaging device 120 to acquire images captured by the imaging device 120 and analyzes the acquired images. Note that the imaging control device 130 may be incorporated inside the imaging device 120, or may control the imaging device 120 by communicating with it.

[0088] 5 is a flowchart showing an example of the operation of the imaging control device 130. For example, the imaging control device 130 may repeatedly execute the analysis process shown in the drawing during operation.

[0089] The imaging control device 130 acquires the image captured by the imaging device 120 from the imaging device 120 (step S131).

[0090] For example, the imaging control device 130 acquires images captured by the imaging device 120 in real time from the imaging device 120. When there are multiple imaging devices 120, the imaging control device 130 may acquire images captured by the multiple imaging devices 120 from the multiple imaging devices 120. The imaging control device 130 may store the acquired images.

[0091] The imaging control device 130 analyzes the image acquired in step S131 (step S132).

[0092] For example, the imaging control device 130 generates analysis data by analyzing an image captured by the imaging device 120. The analysis data includes the positions of the multiple reflecting members 110 included in the image captured by the imaging device 120. The analysis data may further include at least one of the image used for the analysis, the time the image was captured, etc.

[0093] The analysis data may include, instead of or in addition to the positions of the plurality of reflecting members 110 in the image, the relative positional relationships between the plurality of reflecting members 110 in the image. The relative positional relationships may be represented, for example, by vectors or distances. Furthermore, for example, the positions and positional relationships in the analysis data are not limited to the positions and positional relationships in the image, and may be converted into positions and positional relationships in a predetermined coordinate system such as a global coordinate system.

[0094] The shooting time is information indicating when the image was taken, and is expressed, for example, by the date and time when the image was taken. Note that the method of expressing the shooting time is not limited to the method exemplified here.

[0095] In the image, multiple reflective members 110 are included at higher brightness than other areas. Therefore, in the analysis, a general technique for detecting high-brightness areas based on, for example, contrast may be used. Furthermore, the position of the reflective member 110 is the position of the center (or center of gravity) of the high-brightness area, but is not limited to this.

[0096] The images to be analyzed may be all or a part of the images acquired in step S131. For example, the images to be analyzed may be, among the images acquired in step S131, images corresponding to a predetermined time interval longer than the shooting interval.

[0097] The imaging control device 130 transmits the analysis data generated in step S132 to the management device 140 (step S133).

[0098] The timing for transmitting the analysis data from the imaging control device 130 may be determined as appropriate. For example, the analysis data may be transmitted in real time after each analysis, or may be transmitted at predetermined time intervals such as every hour to several hours, or every day.

[0099] As described above, the analysis data does not have to include the images used in the analysis. In this case, the amount of data sent to the management device 140 can be reduced, thereby reducing the communication load.

[0100] (Regarding the management device 140) The management device 140, for example, acquires the analysis data from the imaging control device 130 and stores the history of the analysis data. The management device 140 manages the displacement of the conduit tunnel T using the history of the analysis data, for example.

[0101] 6 is a flowchart showing an example of the operation of the management device 140. For example, the management device 140 may repeatedly execute the management process shown in the figure during operation.

[0102] The management device 140 acquires, for example, the analysis data transmitted from the imaging control device 130 (step S141).

[0103] The management device 140 stores, for example, the analysis data acquired in step S141 (step S142), thereby adding the analysis data acquired in step S141 to the history of analysis data.

[0104] The management device 140 calculates the displacement of the conduit tunnel T, for example, using the history of the analysis data (step S143).

[0105] In more detail, for example, the management device 140 compares the latest analysis data (for example, the analysis data acquired in step S141) with past analysis data. The past analysis data is analysis data in which the image used for analysis was captured at an earlier time than the latest analysis data. There may be multiple pieces of past analysis data used for comparison.

[0106] In comparing the analysis data, the management device 140 calculates the difference in the position of the corresponding reflecting member 110 included in the latest analysis data and the previous analysis data. If there are multiple pieces of previous analysis data, the management device 140 calculates the difference in the position of the corresponding reflecting member 110 included in the latest analysis data and the previous analysis data. The corresponding reflecting member 110 is, for example, the reflecting member 110 located closest in the latest analysis data and the previous analysis data. Note that the method of calculating the displacement may be modified in various ways.

[0107] The management device 140, for example, issues a notification according to the displacement calculated in step S143 (step S144).

[0108] The notification may be sent to a predetermined terminal (not shown) or the like. The notification may include, for example, at least one of the displacement calculated in step S143, information indicating whether or not there is an abnormality in the tunnel T, etc. An abnormality in the tunnel T occurs when the displacement calculated in step S143 satisfies a predetermined abnormality condition.

[0109] The abnormal condition is a condition that defines an abnormality related to the displacement of the tunnel T. For example, the abnormal condition is that part or all of the displacement calculated in step S143 exceeds a predetermined allowable range. However, the abnormal condition is not limited to this and may be determined as appropriate.

[0110] Conditions for issuing a notification (notification conditions) may be determined as appropriate. In this case, the management device 140 may notify a predetermined terminal when the displacement calculated in step S143 satisfies the notification conditions. The notification conditions may be determined as appropriate and may be the same as the abnormal conditions described above, for example.

[0111] In this case, when the abnormality condition is satisfied, management device 140 may notify a predetermined terminal that there is an abnormality in tunnel T. Furthermore, management device 140 may not issue a notification when the abnormality condition is not satisfied (i.e., when tunnel T is normal). Furthermore, management device 140 may notify a predetermined terminal that there is no abnormality in tunnel T (i.e., it is normal) when tunnel T is normal.

[0112] 7 is a diagram showing an example of the physical configuration of the imaging control device 130. The imaging control device 130 is physically composed of, for example, a processor 1020, a memory 1030, a storage device 1040, a network interface 1050, an input interface 1060, an output interface 1070, and the like, which are connected by a data transmission path such as a bus 1010.

[0113] The processor 1020 is realized by, for example, a central processing unit (CPU) or a graphics processing unit (GPU), etc. The memory 1030 is a main storage device realized by, for example, a random access memory (RAM), etc.

[0114] The storage device 1040 is an auxiliary storage device realized by a hard disk drive (HDD), a solid state drive (SSD), a memory card, a read only memory (ROM), or the like.

[0115] The network interface 1050 is an interface for connecting a device equipped with the network interface 1050 to a communication network NT. The input interface 1060 is an interface for a user to input information. The input interface 1060 is composed of, for example, a touch panel, a keyboard, a mouse, etc. The output interface 1070 is an interface for presenting information to a user. The output interface 1070 is composed of, for example, a liquid crystal panel, an organic EL (Electro-Luminescence) panel, etc.

[0116] The storage device 1040 may store a program for realizing the functions of the device that includes it. The functions of the device are realized, for example, by the processor 1020 reading the program stored in the storage device 1040 into the memory 1030 and executing it.

[0117] The management device 140 may also be physically configured in the same manner as the imaging control device 130 .

[0118] One embodiment of the present disclosure has been described above.

[0119] According to this embodiment, the displacement monitoring system 100 includes a plurality of reflecting members 110 and an imaging device 120. The plurality of reflecting members 110 are fixed to the inner wall of the pipeline tunnel T. The imaging device 120 is installed at a fixed position within the pipeline tunnel T and captures images of the plurality of reflecting members 110.

[0120] This makes it possible to monitor the displacement of the pipeline tunnel T using the position of the imaging device 120 included in the image captured by the imaging device 120. Therefore, it becomes possible to easily monitor the displacement of the pipeline tunnel T.

[0121] Furthermore, for example, in the technology described in Patent Document 1, multiple shape measurement devices each equipped with a laser scanner are installed, which means that the overall system configuration including the multiple shape measurement devices and the tunnel displacement measurement device may become large and complex. Since the interior space of a pipeline tunnel T is often smaller than that of a tunnel through which ordinary automobiles or trains travel, it may be difficult to secure the space to install a large and complex system. Even if multiple shape measurement devices could be installed, they may still impede the passage of workers inspecting communication cables, gas pipes, power lines, and the like installed in the pipeline tunnel T.

[0122] According to the displacement monitoring system 100, it is possible to monitor the displacement of the conduit tunnel T with a system having a more compact configuration than the technology described in, for example, Patent Document 1. Furthermore, the displacement monitoring system 100 can be permanently placed in the conduit tunnel T for monitoring. Therefore, it is possible to improve the convenience of monitoring the displacement of the conduit tunnel T.

[0123] According to this embodiment, the internal space of the pipeline tunnel T has a cross-sectional area of ​​2 m 2 That's all.

[0124] The displacement monitoring system 100 can constantly monitor the displacement of such a general conduit tunnel T. Therefore, it is possible to improve the convenience of monitoring the displacement of the conduit tunnel T.

[0125] According to this embodiment, the plurality of reflecting members 110 constitute one or more reflecting member groups G1 to GN. The one or more reflecting member groups G1 to GN are made up of a plurality of reflecting members 110 arranged at one or more common cross sections CS1 to CSN defined for the conduit tunnel T. The number of reflecting members 110 constituting each of the one or more reflecting member groups G1 to GN is four or more.

[0126] As a result, four or more reflecting members 110 are arranged in each of one or more common cross sections CS1 to CSN, making it possible to monitor displacements in multiple directions in each of one or more common cross sections CS1 to CSN. This makes it possible to easily monitor displacements in the conduit tunnel T with high accuracy.

[0127] According to this embodiment, the plurality of reflecting member groups G1 to GN include at least one reflecting member group that is arranged in a portion where the conduit tunnel T curves along the extension direction.

[0128] This makes it possible to monitor displacement of curved portions of the conduit tunnel T where displacement is likely to occur, using the position of the imaging device 120 included in the image captured by the imaging device 120. Therefore, it becomes possible to easily monitor displacement of the curved portions of the conduit tunnel T along the extension direction.

[0129] According to this embodiment, in at least one of the one or more reflecting member groups G1 to GN, the plurality of reflecting members 110 constituting each of the at least one reflecting member group are arranged at equal intervals on a common cross section.

[0130] This makes it possible to monitor displacements in multiple directions in each of the common cross sections CS1 to CSN corresponding to at least one of the reflecting member groups, thereby making it possible to easily monitor displacements in the conduit tunnel T with high accuracy.

[0131] According to this embodiment, there are a plurality of reflective member groups G1 to GN. The plurality of reflective member groups G1 to GN are arranged at a plurality of common cross sections that are defined at equal distance intervals along the extension direction of the conduit tunnel T.

[0132] This makes it possible to monitor displacement in the extension direction of the conduit tunnel T and displacement in multiple directions at each of the multiple common cross sections CS1 to CSN along the extension direction. Therefore, it becomes possible to easily monitor displacement of the conduit tunnel T with high accuracy.

[0133] According to this embodiment, each of the multiple reflective member groups G1 to GN includes at least one reference reflective member arranged at a predetermined interval along the extension direction of the pipeline tunnel T, and a secondary reflective member arranged on the same common cross section as the at least one reference reflective member.

[0134] This allows multiple reflective member groups G1 to GN to be easily installed in the conduit tunnel T. In addition, the reference reflective member can be used to monitor displacement in the extension direction of the conduit tunnel T. The reference reflective member and the secondary reflective member arranged at each common cross section can monitor displacement in multiple directions at each common cross section. Therefore, it becomes possible to easily monitor displacement of the conduit tunnel T with high accuracy.

[0135] According to this embodiment, there are a plurality of reflective member groups G1 to GN, and at least one of the plurality of reflective member groups G1 to GN has a different number of sub-reflective members from the other reflective member groups.

[0136] This makes it possible to easily monitor displacement in a desired direction using the reference reflecting member and the sub-reflecting member for each of the common cross sections CS1 to CSN, for example. Therefore, it becomes possible to easily monitor displacement of the conduit tunnel T with high accuracy.

[0137] According to this embodiment, each of the reflecting members 110 includes a reflecting portion 111, a container 112, a light-transmitting portion 113, and a heater 114. The container 112 accommodates the reflecting portion 111 therein. The light-transmitting portion 113 is fixed to the container 112 and transmits light that enters and exits the reflecting portion 111. The heater 114 is attached to the container 112.

[0138] This reduces the possibility that the reflecting member 110 is heated by the heater 114, causing the reflecting portion 111 to be unable to reflect enough light. Therefore, it becomes possible to easily monitor the displacement of the conduit tunnel T with high accuracy.

[0139] According to this embodiment, the displacement monitoring system 100 includes an imaging control device 130 and a management device 140. The imaging control device 130 generates analysis data including the positions of multiple reflective members included in an image captured by the imaging device 120 in the image. The management device 140 manages the displacement of the pipeline tunnel T based on the generated analysis data. The management device 140 further notifies a predetermined terminal when the displacement of the pipeline tunnel T satisfies predetermined notification conditions. The imaging control device 130 and the heater 114 are each supplied with power from a common power source.

[0140] Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to these. The present invention also includes forms in which some or all of the embodiments and modifications described so far are appropriately combined, and forms in which such forms are appropriately modified. [Explanation of symbols]

[0141] 100 Displacement Monitoring System 110, Gia~Gid Reflective material 111 Reflector 112 container 113 Translucent part 114 Heater 115 Fixing member 120 Imaging Device 130 Shooting control device 140 Management device CS1~CSN,CSi common cross section G1~GN,Gi Reflective material group

Claims

1. a plurality of reflective members fixed to an inner wall of the conduit tunnel; an imaging device that is installed at a fixed position within the conduit tunnel and that images the plurality of reflective members; Displacement monitoring system for pipeline tunnels.

2. The internal space of the pipeline tunnel has a cross-sectional area of ​​2 m ２ That's all The displacement monitoring system of claim 1 .

3. the plurality of reflecting members constitute one or more reflecting member groups, the one or more groups of reflective elements are comprised of a plurality of reflective elements arranged at each of one or more common cross sections defined with respect to the conduit tunnel; The number of the reflective members constituting each of the one or more reflective member groups is four or more. The displacement monitoring system according to claim 1 or 2.

4. The one or more groups of reflecting members include at least one group of reflecting members arranged in a portion where the conduit tunnel curves along the extension direction. The displacement monitoring system of claim 3 .

5. In at least one of the one or more reflecting member groups, a plurality of reflecting members constituting each of the at least one reflecting member group are arranged at equal intervals on the common cross section. The displacement monitoring system of claim 3 .

6. The reflection member group is a plurality of groups, The plurality of reflective member groups are arranged at each of a plurality of common cross sections that are determined at equal distance intervals along the extension direction of the conduit tunnel. The displacement monitoring system of claim 3 .

7. Each of the plurality of reflective member groups is At least one reference reflecting member arranged at predetermined intervals along the extension direction of the conduit tunnel; and a secondary reflecting member disposed on the same common cross section as the at least one reference reflecting member. The displacement monitoring system of claim 3 .

8. The reflection member group is a plurality of groups, At least one of the plurality of reflecting member groups has a different number of the sub-reflecting members from the other reflecting member groups. The displacement monitoring system of claim 7.

9. Each of the reflecting members is A reflector; a container that houses the reflecting portion; a light-transmitting portion fixed to the container and through which light incident on and exiting from the reflecting portion passes; a heater attached to the container; The displacement monitoring system according to claim 1 or 2.

10. an imaging control device that generates analysis data including positions of the plurality of reflective members included in the image captured by the imaging device; a management device for managing displacement of the conduit tunnel based on the generated analysis data, The management device further notifies a predetermined terminal when the displacement of the conduit tunnel satisfies a predetermined notification condition, The imaging control device and the heater are each supplied with power from a common power source. The displacement monitoring system of claim 9.

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