Shaft inspection method

Abstract

To provide a shaft interior inspection device capable of easily and highly accurately confirming whether an inner wall of a shaft needs to be repaired.SOLUTION: A shaft inspection device according to the present invention is a shaft interior inspection device for inspecting the presence or absence of peeling portions on an inner wall of a shaft, and comprises a lighting unit that emits light into the shaft, an imaging unit for imaging the inside of the shaft, an irradiation unit that irradiates a laser beam to at least a peeled portion inside the imaged shaft, a distance measuring unit that receives the laser beam reflected at the peeled portion and measures the distance from an irradiation position of the laser beam to the peeled portion, and a compass for specifying the direction of the peeled portion imaged by the imaging unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an apparatus and a method for inspecting inside a shaft. [Background technology]

[0002] Methods for constructing a shaft include the raise boring method. In the raise boring method, a pilot hole is drilled with a machine installed above, and the shaft is cut from inside the tunnel below. In the raise boring method, the pilot bit is removed in the lower tunnel and replaced with a large diameter reamer bit for widening, and the reamer bit is pulled upward while rotating. This constructs a shaft of the specified size.

[0003] The flatness of the inner wall of the excavated shaft varies depending on the stratum. It is especially important to know the condition of the inner wall of the soft stratum, as this is a factor that affects whether the shaft can stand on its own.

[0004] Therefore, for example, a shaft inspection device has been proposed in which, when inspecting the inside of a shaft, a camera is suspended and introduced into the shaft from an accessible entrance located near the peripheral edge of the cover, and this camera is used to take pictures of the inside of the shaft to check the state of corrosion, etc. inside the shaft.

[0005] As such an inspection device for inside a vertical shaft, for example, one has been disclosed that is composed of an erection member that is attached in an erected state between the opposing edges of the entrance / exit section, a mounting member that is detachably attached to this erection member and placed above the vertical shaft, and a hanging member that is attached to this mounting member and hangs the camera (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2016-223164 A Summary of the Invention [Problem to be solved by the invention]

[0007] When inspecting the inner wall of a shaft, in order to increase the accuracy of the inspection, it is important to consider not only the unevenness and cracks in the inner wall at the damaged area, but also the surrounding geology when deciding whether or not the shaft needs to be repaired.

[0008] One aspect of the present invention aims to provide a shaft interior inspection device that can easily and accurately check whether or not the inner wall of a shaft needs repair. [Means for solving the problem]

[0009] One aspect of the shaft inspection device of the present invention is a shaft inspection device that inspects the presence or absence of peeled areas on the inner wall of a shaft, and includes an illumination unit that emits light into the inside of the shaft, an imaging unit that images the inside of the shaft, an irradiation unit that irradiates laser light onto at least the peeled area inside the imaged shaft, a distance measuring unit that receives the laser light reflected from the peeled area and measures the distance from the irradiation position of the laser light to the peeled area, and a compass that identifies the direction of the peeled area imaged by the imaging unit.

[0010] One aspect of the method for inspecting inside a vertical shaft according to the present invention is a method for inspecting inside the vertical shaft using the above-mentioned shaft inspection device, in which the lighting unit emits light toward the inside of the shaft, the imaging unit images the inner wall of the shaft illuminated by the lighting unit, the distance measuring unit receives laser light that is irradiated from the irradiation unit onto at least the peeled portion of the imaged inner wall of the shaft and reflected, measures the distance from the irradiation position of the laser light to the peeled portion, and the compass identifies the direction of the imaged peeled portion. Effect of the Invention

[0011] One aspect of the shaft inspection device according to the present invention can easily and accurately check whether or not the inner wall of the shaft needs repair. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram showing a configuration of a shaft inspection device according to an embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a cross-sectional view of FIG. [Figure 4] FIG. 3 is a view seen in the Y-axis direction of FIG. 2. [Diagram 5] 4 is a perspective view showing a state in which a part of the stand in FIG. 3 is cut away. FIG. [Figure 6] FIG. 6 is a plan view of FIG. 5. [Figure 7] 4 is a perspective view showing a state in which a part of the stand in FIG. 3 is cut away. FIG. [Figure 8] FIG. 8 is a plan view of FIG. [Figure 9] FIG. 4 is a front view showing a part of the stand in FIG. [Figure 10] 1 is a flowchart showing a method for inspecting inside a shaft according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the embodiments of the present invention will be described in detail. In order to facilitate understanding of the description, the same components in each drawing are given the same reference numerals, and duplicated descriptions will be omitted. In addition, the scale of each member in the drawings may differ from the actual scale. In this specification, "~" indicating a numerical range means that the numerical values ​​before and after it are included as the lower and upper limits, unless otherwise specified.

[0014] <Inspection equipment inside the shaft> A description will be given of a shaft inspection device according to an embodiment of the present invention. Fig. 1 is a schematic diagram showing the configuration of the shaft inspection device. As shown in Fig. 1, the shaft inspection device 1 according to this embodiment includes a main body 10, an illumination unit 20, an irradiation unit 30, a compass 40, a distance measurement unit 50, an evaluation imaging unit 60 which is a second imaging unit, an imaging unit 70, a network camera 80, a swivel 90 which is a weight, and a control unit 100, and inspects the presence or absence of peeling points on the inner wall 200a of the shaft 200.

[0015] A simple scaffolding (hereinafter simply referred to as scaffolding) 2 made of single pipes is assembled on the ground G of the shaft 200, and rollers 3 are attached to the scaffolding 2. The rollers 3 allow a wire rope 4 to be freely raised and lowered from the ground G into the shaft 200. The shaft interior inspection device 1 is held in a state suspended from the wire rope 4 by a swivel 90, and the wire rope 4 is raised and lowered within the shaft 200 by operating the electric winch 5 and rotating the winding part 6. As the wire rope 4 is raised and lowered, the shaft interior inspection device 1 is raised and lowered within the shaft 200, and the presence or absence of peeling areas on the inner wall 200a of the shaft 200 is inspected.

[0016] The shaft 200 is a cylindrical structure, and although there is no particular limitation on the size thereof, for example, the diameter is 1.0 m to 4.0 m, and the depth is 20.0 m to 100.0 m.

[0017] The shaft interior inspection device 1 is equipped with an illumination unit 30, a compass 40, a distance measurement unit 50, and an imaging unit 70, and is thereby able to acquire the position, scale (e.g., depth, etc.) and progression direction of the peeled off portion of the inner wall 200a of the shaft 200. Based on the acquired information on the peeled off portion and the surrounding geological information, the shaft interior inspection device 1 can appropriately determine the condition of the peeled off portion of the inner wall 200a of the shaft 200, thereby improving the work of checking whether the inner wall 200a of the shaft 200 needs repair.

[0018] In this specification, a three-dimensional Cartesian coordinate system with three axial directions (X-axis, Y-axis, and Z-axis) is used, with one width direction of the main body 10 being the X-direction, the other being the Y-direction, and the height direction being the Z-direction. The direction from the bottom to the top of the main body 10 is the +Z-axis direction, and the opposite direction is the -Z-axis direction. In the following description, the +Z-axis direction may be referred to as up or upward, and the -Z-axis direction may be referred to as down or downward.

[0019] Each component of the shaft inspection device 1 will be described.

[0020] FIG. 2 is a perspective view of the inspection device in the shaft, FIG. 3 is a cross-sectional view of FIG. 2, and FIG. 4 is a view in the Y-axis direction of FIG. 2. As shown in FIG. 2 and FIG. 3, the main body 10 is a housing in which the lighting unit 20 is installed at its upper part and which houses the irradiation unit 30, the compass 40, the distance measurement unit 50, the evaluation imaging unit 60, the imaging unit 70, and the network camera 80. The main body 10 is suspended from the swivel 90 by the chain 110, with both ends of the chain 110 being connected to the lighting unit 20 provided at its upper part. The wire rope 4 is connected to the upper part of the swivel 90. Thus, the main body 10 is held in a suspended state in the shaft 200 by the wire rope 4 via the swivel 90.

[0021] 2, the main body 10 includes a cylindrically formed stand 11, a holder 12 provided on the upper part of the stand 11, and an observation table 13 provided within the stand 11. The stand 11, the holder 12, and the observation table 13 can be connected to each other by welding or the like.

[0022] As shown in FIG. 2, the pedestal 11 is formed in a cylindrical shape. The pedestal 11 has an opening 111 on its side. The opening 111 is composed of openings 111A, 111B, and 111C, and the openings 111A, 111B, and 111C are provided in this order from top to bottom in three stages in the vertical direction of the side of the pedestal 11. As shown in FIG. 4, each opening 111 is provided at a position that does not overlap with the position of each observation stage 13 when viewed from the front of the pedestal 11 (when viewed in the Y-axis direction). That is, when viewed from the side of the main body 10, the opening 111A is provided so as to be located above one observation stage 13, the opening 111B is provided so as to be located between the two observation stages 13, and the opening 111C is provided so as to be located below the other observation stage 13.

[0023] The size of the opening 111 can be designed appropriately, as long as it is large enough to allow the irradiation unit 30, compass 40, distance measurement unit 50, evaluation imaging unit 60, imaging unit 70 and network camera 80 to be inserted and removed into the main body 10.

[0024] Further, the base 11 has a through hole 11a on its side surface, which is provided so as to correspond to the positions of the laser irradiation port of the irradiation unit 30 and the laser receiving unit (not shown) of the distance measurement unit 50, and a through hole 11b formed so as to be capable of being imaged by the imaging unit 70. The through holes 11a and 11b are provided in pairs so as to face each other on the wall surface of the base 11.

[0025] The size of the through holes 11a and 11b is not particularly limited and can be appropriately designed according to the size of the laser irradiation port of the irradiation unit 30, the laser receiving unit (not shown) of the distance measurement unit 50, the imaging unit 70, and the like.

[0026] As shown in FIG. 2, the holder 12 is provided on the upper part of the gantry 11, and is formed in a circular shape larger than the gantry 11 in a plan view.

[0027] The observation table 13 is provided within the gantry 11. The observation table 13 is composed of observation tables 13A and 13B, which are provided in this order from top to bottom in the vertical direction within the gantry 11 in two stages.

[0028] The observation platforms 13A and 13B each have holes 131A and 131B (see Figures 5 and 7) in a portion of their main surface, and are arranged so that wiring (not shown) connecting the lighting fixtures 22, irradiation unit 30, distance measurement unit 50, evaluation imaging unit 60, imaging unit 70, etc. that make up the shaft inspection device 1 to the control unit 100 can pass through the main body 10 in the vertical direction.

[0029] As shown in FIG. 2, the lighting unit 20 has a pair of handles 21 and a lighting fixture 22.

[0030] The pair of handles 21 are provided on the upper part of the holding part 12. The pair of handles 21 are connected at both ends of a chain 110, and are suspended from the hook part of the swivel 90 by the chain 110. As a result, the main body 10 is suspended from the swivel 90 via the chain 110. The handles 21 may be formed of metal, stainless steel, an alloy, or the like. The handles 21 are fixed to the main body 10 by welding or the like. Note that in this embodiment, a chain may be used as the handles 21, and the chain may be directly hooked onto the hook part of the swivel 90.

[0031] 1, a pair of lighting fixtures 22 are provided at positions different from the pair of handle parts 21 provided on the upper part of the main body 10 so that their illumination surfaces face the inner wall 200a of the shaft 200, and emit light toward the inner wall 200a of the shaft 200. The number of lighting fixtures 22 can be set according to the number of handle parts 21, and may be one or three or more.

[0032] The lighting fixture 22 is not particularly limited, and any lighting device that can illuminate the inside of the shaft 200 can be used.

[0033] The lighting device 22 may be fixed to the pair of handles 21 by any method, and the fixing method is not particularly limited.

[0034] 2 and 4, the lighting fixture 22 is preferably provided on the upper part of the main body 10 so as to face obliquely downward. That is, the lighting fixture 22 is preferably provided so as to be inclined downward with respect to the up-down direction of the main body 10. As a result, the lighting fixture 22 can irradiate light obliquely downward, so that the imaging portion of the imaging unit 70 can be brighter and the inner wall 200a of the shaft 200 can be easily viewed by the network camera 80.

[0035] 3, a pair of irradiation units 30 are provided on the observation table 13A in the main body 10 along the inner wall 200a of the stand 11. The irradiation unit 30 irradiates laser light onto at least the peeled portion inside the imaged shaft 200. The irradiation unit 30 is not particularly limited as long as it is a device capable of irradiating laser light.

[0036] Fig. 5 is a perspective view showing a state in which a part of the pedestal 11 in Fig. 3 is cut out, and Fig. 6 is a plan view of Fig. 5. As shown in Fig. 5 and Fig. 6, a pair of irradiation units 30 are provided to face each other, and each is accommodated and fixed in a fixing holder 31 provided on the inner wall 200a. The irradiation units 30 are provided in the fixing holder 31 so that the laser light can pass through the through hole 11a of the pedestal 11.

[0037] The number of irradiation units 30 can be set appropriately, and three or more may be provided.

[0038] As shown in Fig. 3, the compass 40 is provided on the observation stand 13A inside the main body 10. As shown in Fig. 5 and Fig. 6, a pair of compasses 40 are provided on the observation stand 13A. The pair of compasses 40 are provided parallel to each other and are each housed in a fixing holder 41 provided on the observation stand 13A.

[0039] The compass 40 indicates a direction and can identify the direction of the imaged peeling location. The compass 40 is not particularly limited as long as it can identify the direction. For example, a compass or the like can be used as the compass 40.

[0040] As shown in Fig. 3, the distance measuring unit 50 is provided on the observation stage 13A inside the main body 10. As shown in Fig. 5 and Fig. 6, a pair of distance measuring units 50 are provided on the observation stage 13A. The pair of distance measuring units 50 are provided parallel to each other and are each housed in a fixing holder 51 provided on the observation stage 13A.

[0041] The number of distance measurement units 50 can be set appropriately, and is preferably set in accordance with the number of distance measurement units 50 to be installed, and may be one or three or more.

[0042] The distance measuring unit 50 receives the laser light irradiated by the irradiating unit 30 and reflected at the peeling location, and measures the distance from the irradiation position of the laser light to the peeling location of the inner wall 200a of the shaft 200. The distance measuring unit 50 is not particularly limited as long as it is a device that can measure the distance to the wall surface of the shaft 200. As the distance measuring unit 50, for example, an optical distance meter or the like can be used.

[0043] The position of the laser light is the position where the laser light of the irradiation unit 30 is emitted, and may be located outside the main body 10, may be located inside the main body 10, or may be installed at approximately the same position as the side of the main body 10. In particular, it is preferable that the position of the laser light is installed at approximately the same position as the side of the main body 10. When the position of the laser light is installed at approximately the same position as the side of the main body 10, the distance from the position of the laser light to the peeled part of the inner wall 200a of the shaft 200 can be considered as the distance from the side of the main body 10 to the peeled part of the inner wall 200a of the shaft 200, making it easier to grasp the distance between the side of the main body 10 and the peeled part. In addition, even if the position of the irradiation unit 30 is shifted within the main body 10, the blocking of the laser light irradiation can be reduced.

[0044] 3, the evaluation imaging unit 60 is provided on the underside of the bottom surface of the holding unit 12 of the main body 10, and captures images of the compass 40 and the distance measurement unit 50. In this way, the evaluation imaging unit 60 can capture images of the distance measured by the distance measurement unit 50 and the direction indicated by the compass 40, which are displayed on the distance measurement unit 50.

[0045] As the evaluation imaging section 60, for example, a camera or the like can be used.

[0046] The evaluation imaging unit 60 may be accommodated and fixed in a holder (not shown) provided on the underside of the bottom surface of the holding unit 12, or may be fixed to the underside of the bottom surface of the holding unit 12 using a bonding material such as an adhesive.

[0047] The evaluation imaging unit 60 may be provided at a position below the bottom surface of the holding unit 12 of the main body 10 where it can capture images of the compass 40 and the distance measurement unit 50, and the installation position of the evaluation imaging unit 60 is preferably selected as appropriate depending on the positions of the compass 40 and the distance measurement unit 50. In this embodiment, the compass 40 and the distance measurement unit 50 are provided in the approximate center on the observation table 13A, so the evaluation imaging unit 60 is preferably provided in the approximate center of the holding unit 12 in a plan view.

[0048] 3, the imaging unit 70 is provided inside the main body 10 below the lighting unit 20 and the irradiation unit 30, and captures an image of the inner wall 200a of the shaft 200 illuminated by the lighting fixture 22. A pair of imaging units 70 are provided along the inner wall 200a of the stand 11 above the observation table 13B inside the main body 10. As the imaging unit 70, for example, a camera or the like can be used.

[0049] Fig. 7 is a perspective view showing a state in which a part of the stand 11 in Fig. 3 is cut out, and Fig. 8 is a plan view of Fig. 7. As shown in Fig. 7 and Fig. 8, a pair of imaging units 70 are provided opposite each other, and each is accommodated and fixed in a fixing holder 71 provided on the inner wall 200a. The imaging units 70 are provided in the fixing holder 71 so that light can pass through the through hole 11b.

[0050] The number of imaging units 70 can be set appropriately, and may be three or more.

[0051] As shown in Fig. 3, the network camera 80 is provided in the main body 10 below the illumination unit 20, the irradiation unit 30, and the imaging unit 70. Fig. 9 is a front view showing a part of the stand 11 in Fig. 3. As shown in Fig. 9, the network camera 80 is provided on the lower surface of the observation stand 13B in the main body 10, and is located between the observation stand 13B and the lower end of the stand 11.

[0052] The network camera 80 captures an image inside the shaft 200. There are no particular limitations on the network camera 80 as long as it can observe the inside of the shaft 200 and capture an image. As the network camera 80, for example, a general network camera can be used.

[0053] As shown in Fig. 1, the swivel 90 is connected at its upper end to the wire rope 4, and has a chain 110 hooked at its lower end. The swivel 90 is suspended in the vertical shaft 200 by the wire rope 4. The swivel 90 has a function of suppressing the rotation of the main body 10. Note that, although the swivel 90 is used as a weight in this embodiment, there is no particular limitation and anything other than a swivel may be used as long as it can suppress the rotation of the main body 10 while holding it in a suspended state.

[0054] As shown in Fig. 3, the control unit 100 is provided at the bottom B of the shaft 200. The control unit 100 is connected to the lighting unit 20, the irradiation unit 30, the distance measurement unit 50, the evaluation imaging unit 60, the imaging unit 70, and the network camera 80, which constitute the shaft interior inspection device 1, via communication lines using cables or the like (not shown), and performs various controls of these. Note that the communication lines are not limited to wired lines, and may be wireless communication lines.

[0055] In addition, the control unit 100 can display the ON / OFF status of the lighting unit 20, the measurement results of the distance measurement unit 50, the images captured by the evaluation imaging unit 60, the images captured by the imaging unit 70, the observed images of the network camera 80, etc. on a display unit (not shown).

[0056] As shown in Fig. 1, the shaft inspection device 1 has a kongou-uchi rope 130 extending from a take-up unit 120 installed at the bottom B of the shaft 200 connected to the bottom of the main body 10. When the shaft inspection device 1 is raised or lowered in the shaft 200, the kongou-uchi rope 130 is pulled from the take-up unit 120 so that tension is generated in the kongou-uchi rope 130, thereby reducing the rotation and swaying of the main body 10 during the raising and lowering. In particular, the take-up unit 120 makes it easy to keep the position of the kongou-uchi rope 130 constant, so that the rotation and swaying of the main body 10 can be effectively reduced.

[0057] In addition, in order to effectively reduce the rotation and swinging of the main body 10, two or more winding parts 120 and two or more kongou-uchi ropes 130 may be provided.

[0058] <Inspection method inside the shaft> The shaft inspection method according to this embodiment will be described. The shaft inspection method according to this embodiment is a shaft inspection method for inspecting the inside of the shaft 200 using the shaft inspection device 1 shown in FIG. 1. In the shaft inspection method according to this embodiment, the lighting unit 20 emits light toward the inside of the shaft 200, the imaging unit 70 images the inner wall 200a of the shaft 200 illuminated by the lighting unit 20, the distance measurement unit 50 receives the reflected laser light irradiated from the irradiation unit 30 to at least the peeled part of the inner wall 200a of the shaft 200 that has been imaged, measures the distance from the irradiation position of the laser light to the peeled part, and identifies the direction of the peeled part that has been imaged by the compass 40.

[0059] The shaft interior inspection method according to this embodiment preferably includes a step of emitting light toward the inside of the shaft 200 by the lighting unit 20, an image of the inner wall 200a of the shaft 200 illuminated by the lighting unit 20 by the imaging unit 70, receiving the reflected laser light irradiated by the irradiation unit 30 at least at the peeled part of the inner wall 200a of the shaft 200 imaged by the distance measurement unit 50, measuring the distance from the irradiation position of the laser light to the peeled part, and specifying the direction of the peeled part imaged by the compass 40. That is, the shaft interior inspection method according to this embodiment preferably includes at least simultaneously performing the imaging by the imaging unit 70, the measurement of the distance from the irradiation position of the laser light to the peeled part by the distance measurement unit 50, and the specification of the direction of the peeled part by the compass 40.

[0060] Fig. 10 is a flow chart showing the method for inspecting inside a shaft according to this embodiment. As shown in Fig. 10, the method for inspecting inside a shaft according to this embodiment first involves connecting a pair of handles 21 provided on the upper part of the main body 10 to each other so that the chain 110 does not come off, suspending the chain 110 from a swivel 90, and connecting one end of the wire rope 4 wound around the electric winch 5 to the swivel 90, thereby suspending the main body 10 in the shaft 200 by the wire rope 4 via the swivel 90 (step S11).

[0061] Next, one end of the wire rope 4 is lowered into the shaft 200 by the electric winch 5, and the main body 10 suspended from the wire rope 4 is lowered into the shaft 200 (step S12).

[0062] At this time, it is preferable to turn on the pair of lighting fixtures 22 to irradiate light onto the inner wall 200a of the shaft 200. The turning on of the power to the lighting fixtures 22 may be controlled by operating the control unit 100, or the power source provided in the lighting fixtures 22 may be directly operated by an inspection worker.

[0063] Next, while the main body 10 is lowered into the shaft 200, the inner wall 200a of the shaft 200 is observed by the network camera 80 (step S13).

[0064] The orientation of the network camera 80 can be controlled by an inspection operator operating the control unit 100 .

[0065] Next, when the main body 10 reaches the bottom B of the shaft 200, the wire rope 4 is wound up by the electric winch 5 to pull the main body 10 up to the ground G of the shaft 200 (step S14).

[0066] After the main body 10 is raised to the ground G of the shaft 200, the power supply to the lighting fixture 22 may be turned off depending on the time to perform the next step.

[0067] Next, during observation by the network camera 80, it is determined whether or not the inner wall 200a has changed and there is a peeled portion (step S15).

[0068] If no particular change in the inner wall 200a is found (step S15: No), the process returns to step S12.

[0069] If any part of the inner wall 200a where it has changed is found (step S15: Yes), the power sources of the irradiation unit 30, the distance measurement unit 50, the evaluation imaging unit 60 and the imaging unit 70 are turned on (step S16).

[0070] This allows the pair of imaging units 70 to capture an image of the inner wall 200a of the shaft 200, while the distance measuring unit 50 receives the laser light that is irradiated by the irradiation unit 30 onto the peeled area and reflected, thereby enabling the distance between the laser irradiation position and the inner wall 200a of the shaft 200 to be measured.

[0071] The power supplies of the irradiation unit 30, distance measurement unit 50, evaluation imaging unit 60 and imaging unit 70 may be controlled by the control unit 100, or the power supplies of the irradiation unit 30 etc. may be directly controlled by an inspection operator.

[0072] Next, similarly to step S12, the main body 10 is lowered into the vertical shaft 200 again (step S17).

[0073] Then, while the main body 10 is lowered into the shaft 200, the pair of imaging units 70 capture images of the inner wall 200a of the shaft 200 to obtain an image, and the distance measuring unit 50 receives the laser light irradiated by the irradiation unit 30 to the peeled area and reflected, thereby measuring the distance between the laser irradiation position and the inner wall 200a of the shaft 200.

[0074] In addition, the evaluation imaging unit 60 images the compass 40 and the distance measuring unit 50, and captures the direction indicated by the compass 40 and the measured value of the distance between the laser irradiation position and the inner wall 200a of the shaft 200, which is displayed on the distance measuring unit 50.

[0075] When lowering the main body 10 back into the shaft 200, it is preferable to turn on the pair of lighting fixtures 22 and irradiate light onto the inner wall 200a of the shaft 200 in the same manner as described above. Irradiating the inner wall 200a of the shaft 200 with light makes it easier to take an image of the inner wall 200a.

[0076] Next, when the main body 10 reaches the bottom B of the shaft 200, the wire rope 4 is wound up by the electric winch 5, as in step S14 above, to pull the main body 10 up to the ground G of the shaft 200 (step S18).

[0077] Next, the direction of the peeling location is obtained based on the direction information from the compass 40 from the video acquired by the evaluation imaging unit 60, and distance information between the laser irradiation position and the inner wall 200a of the shaft 200 is obtained, which is displayed on the distance measuring unit 50 (step S19).

[0078] This allows the inspection worker to obtain the position, scale, and direction of progression of the damaged area based on the image of the damaged area, the distance between the main body 10 and the inner wall 200a of the shaft 200, and the direction indicated by the compass 40. The inspection worker can appropriately determine the condition of the peeled area of ​​the inner wall 200a of the shaft 200 from the obtained information on the damaged area by referring to the surrounding geological information of the image previously obtained. Therefore, by using the shaft interior inspection method according to this embodiment, the inspection worker can confirm whether or not the inner wall 200a of the shaft 200 needs repair.

[0079] Thus, the shaft inspection device 1 according to this embodiment includes the lighting unit 20, the irradiation unit 30, the compass 40, the distance measurement unit 50, and the imaging unit 70. The shaft inspection device 1 uses the lighting unit 20 to brighten the inside of the shaft 200 to make the inner wall 200a easier to see, and can obtain a bright image when the inner wall 200a is imaged by the imaging unit 70, so that the position of the peeled part of the inner wall 200a can be easily confirmed from the image captured by the imaging unit 70. In addition, the shaft inspection device 1 uses the distance measurement unit 50 to measure the distance from the irradiation position of the laser light irradiated from the irradiation unit 30 to the peeled part, and identifies the direction of the peeled part with the compass 40, so that the scale (e.g., depth, etc.) and the progression direction of the peeled part can be confirmed. The shaft inspection device 1 can use the obtained information such as the position of the peeled part and refer to the surrounding geological information including the peeled part to determine the state of the peeled part of the inner wall 200a, so that the progress degree of the peeled part of the inner wall 200a can be easily confirmed. Therefore, the shaft inside inspection device 1 can easily and accurately check whether or not the inner wall 200a of the shaft 200 needs repair.

[0080] The shaft inspection device 1 can include a main body 10 and a swivel 90. As a result, the shaft inspection device 1 can suppress the rotation of the main body 10 in the shaft 200 by the swivel 90, so that the rotation of the image captured by the imaging unit 70 is suppressed, and the inner wall 200a of the shaft 200 can be stably imaged. Therefore, the shaft inspection device 1 can easily observe the state of the inner wall 200a of the shaft 200, and can more easily confirm the progress of the peeling part of the inner wall 200a of the shaft 200. Therefore, the shaft inspection device 1 can more reliably confirm whether the inner wall 200a of the shaft 200 needs repair.

[0081] In the shaft inspection device 1, the lighting fixture 22 can be provided at an angle diagonally downward on the upper part of the main body 10. This allows the shaft inspection device 1 to irradiate light diagonally downward from the lighting fixture 22, allowing the imaging unit 70 to capture a brighter image. Therefore, the shaft inspection device 1 can more reliably observe the peeled part of the inner wall 200a, making it easier to identify the peeled part of the inner wall 200a of the shaft 200 and improving the observation accuracy.

[0082] The shaft inspection device 1 can be equipped with a network camera 80. This allows the shaft inspection device 1 to observe the inner wall 200a while descending into the shaft 200, and to confirm peeling portions of the inner wall 200a. Therefore, the shaft inspection device 1 can easily confirm whether or not the inner wall 200a needs repair while performing the operation of lowering the main body 10 into the shaft 200.

[0083] The shaft inspection device 1 can accommodate the network camera 80 in the main body 10 while being provided below the irradiation unit 30, the distance measurement unit 50, and the imaging unit 70. That is, the shaft inspection device 1 can be provided so that the network camera 80 is located in the main body 10 below the imaging unit 70 and the distance measurement unit 50 in the height direction of the main body 10. As a result, even if the network camera 80 is rotated 360° in the horizontal direction, the shaft inspection device 1 can prevent the observation from being blocked by the irradiation unit 30, the distance measurement unit 50, and the imaging unit 70, so that the inner wall 200a of the shaft 200 can be reliably observed and the peeling part of the inner wall 200a can be suppressed from being overlooked. Therefore, the shaft inspection device 1 can reliably confirm the part of the inner wall 200a that needs repair while performing the operation of lowering the main body 10 into the shaft 200.

[0084] Furthermore, since the shaft interior inspection device 1 can house the network camera 80 within the main body 10, it is possible to reduce contact of the network camera 80 with the outside, such as the inner wall 200a and bottom of the shaft 200. Therefore, the shaft interior inspection device 1 can perform inspection while suppressing damage to the network camera 80, and therefore it is possible to stably and safely check whether the inner wall 200a of the shaft 200 needs repair.

[0085] The shaft interior inspection device 1 can suspend the main body 10 from the swivel 90 via the chain 110. This allows the irradiation unit 30, the compass 40, the distance measurement unit 50, and the imaging unit 70 housed in the main body 10 to be moved up and down simultaneously into the shaft 200, so that the shaft interior inspection device 1 can easily irradiate the inner wall 200a, particularly the peeled portion, take an image of the peeled portion, and measure the distance from the irradiation position of the laser light to the inner wall 200a at the same time with a simple configuration.

[0086] The shaft inspection device 1 can include an evaluation imaging unit 60. This allows the shaft inspection device 1 to simultaneously image the distance measurement value displayed on the distance measurement unit 50 and the direction indicated by the compass 40 using the evaluation imaging unit 60, so that the distance from the laser light irradiation position of the peeled part of the inner wall 200a of the shaft 200 to the inner wall 200a and the direction of the peeled part can be reliably grasped. Therefore, the shaft inspection device 1 can specify the position, size, direction, etc. of the peeled part of the inner wall 200a in more detail, making it easier to specify the damaged part of the inner wall 200a.

[0087] The shaft inspection device 1 can be equipped with two of each of the lighting fixtures 22, the irradiation unit 30, the compass 40, and the distance measurement unit 50. The shaft inspection device 1 can be equipped with a pair of each of the lighting fixtures 22 and the irradiation unit 30 so as to face each other, so that it can measure the distance from the irradiation position of the laser light to the inner wall 200a while simultaneously irradiating light to a plurality of points on the inner wall 200a, such as opposing positions of the inner wall 200a. Therefore, the shaft inspection device 1 can inspect the inner wall 200a more efficiently. In addition, the shaft inspection device 1 can illuminate the inner wall 200a with a pair of lighting fixtures 22 at the same height, so that the inside of the shaft 200 can be brightened approximately evenly. Therefore, the shaft inspection device 1 can more reliably observe and identify the peeled part of the inner wall 200a, making it easier to identify the peeled part of the inner wall 200a.

[0088] In this embodiment, the main body 10 is provided with the lighting unit 20, distance measurement unit 50, compass 40, distance measurement unit 50, evaluation imaging unit 60, imaging unit 70 and network camera 80, and these are provided within the vertical shaft 200 by wire ropes 4, but it is also possible to not provide the main body 10 and instead suspend the lighting unit 20, distance measurement unit 50, compass 40, distance measurement unit 50, evaluation imaging unit 60, imaging unit 70 and network camera 80 directly within the vertical shaft 200 by wire ropes 4.

[0089] In this embodiment, the shaft interior inspection device 1 may include one each of the lighting fixture 22, the irradiation unit 30, the compass 40, and the distance measurement unit 50, or three or more each.

[0090] Although the embodiment has been described above, the above embodiment is presented as an example, and the present invention is not limited to the above embodiment. The above embodiment can be implemented in various other forms, and various combinations, omissions, substitutions, modifications, etc. can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0091] 1. Inspection equipment inside the shaft 10. Main Unit 11 Mounting stand 12 Holding part 13, 13A, 13B Observation platform 20 Lighting Department 21 Handle 22 Lighting equipment 30 Irradiation unit 40 compass 50 Distance measurement unit 60 Evaluation imaging unit (second imaging unit) 70 Imaging unit 80 Network Camera 90 Swivel (weight) 200 Shaft 200a inner wall 111, 111A, 111B, 111C opening

Claims

1. A method for inspecting inside a shaft using an inspection device for inspecting inside the shaft, the inspection device including an illumination unit that emits light into the inside of the shaft, an imaging unit that images the inside of the shaft, an irradiation unit that irradiates laser light onto at least a peeled portion inside the imaged shaft, a distance measurement unit that receives the laser light reflected from the peeled portion and measures the distance from the irradiation position of the laser light to the peeled portion, and a compass that identifies the direction of the peeled portion imaged by the imaging unit, One end of the wire rope connected to the shaft inspection device is lowered into the shaft by a winch, Observe the image of the inside of the shaft captured by a network camera connected by a communication line, and confirm the presence or absence of the peeling part where the inner wall has changed; If there is a peeled portion, The lighting unit emits light toward the inside of the shaft, The imaging unit captures an image of the inner wall of the shaft including the peeled portion illuminated by the lighting unit; The distance measuring unit receives the laser light reflected by the irradiation unit at least at the peeled portion of the inner wall of the shaft that has been imaged, and measures the distance from the irradiation position of the laser light to the peeled portion; Identifying the direction of the imaged peeling portion by the compass. How to inspect inside the shaft.

2. A method for inspecting inside a shaft as described in claim 1, wherein a weight is connected to one end of the wire rope to suppress rotation of a main body having an observation platform on which the lighting unit, the imaging unit, the irradiation unit, the distance measurement unit and the compass are installed.

3. The method for inspecting inside a shaft according to claim 1 or 2, wherein the lighting unit is provided at an angle downward on an upper portion of a main body having an observation platform on which the lighting unit, the imaging unit, the irradiation unit, the distance measurement unit and the compass are installed.

4. A method for inspecting inside a shaft as described in claim 3, wherein the network camera is arranged below the main body relative to the imaging unit, the irradiation unit and the distance measurement unit and is contained within the main body.

5. The method for inspecting inside a shaft according to claim 2, wherein the main body is suspended from the weight via a suspension member.

6. The method for inspecting inside a shaft according to any one of claims 1 to 5, wherein the distance measuring unit and the compass are imaged by a second imaging unit.

7. The method for inspecting inside a shaft according to any one of claims 1 to 6, wherein at least one of the lighting unit, the irradiation unit, the distance measuring unit, and the compass is provided in plurality.

Images