JP6899180B2 - Muddy water pit survey equipment and survey method - Google Patents

Description

The present invention relates to an apparatus for investigating the inner wall surface of a muddy water pit, and an investigation method using this apparatus.

The muddy water pit is a facility that performs pretreatment to discharge factory wastewater to the outside, and it is necessary to operate it at all times during the operation of the factory. Therefore, inevitably, it is necessary to investigate the muddy water pit in a state where muddy water is stored. The deterioration status of the outer peripheral part of the muddy water pit can be investigated visually by the operator. However, it is necessary to investigate in a state where turbid water with very poor transparency is stored and in a state where aeration is operated in an aeration tank or the like. Furthermore, turbid water is weakly acidic or weakly alkaline, and there are many safety problems, so it is not preferable for a diver to work and investigate.

For the above reasons, there was no appropriate method for investigating the deterioration of the inner wall surface of the muddy water pit.

In Patent Document 1, a stretchable airtight container having a first translucent portion on the inspection target surface side and a second translucent portion on the front side of the camera, and a fresh water supply means for supplying fresh water into the airtight container. An underwater camera device comprising the above is disclosed. This device extends the closed container by supplying fresh water into the closed container, and images the first translucent portion in contact with or close to the surface to be inspected.

Further, Patent Document 2 discloses an inspection device for an in-liquid inspection surface in which a transparent sheet that can be filled with fresh water is arranged on the inspection surface side of the video camera. This device takes an image with the transparent sheet in close contact with the inspection surface by filling it with fresh water.

Further, Patent Document 3 includes a photographing housing having a built-in camera, a stereoscopic photography attachment that covers an object to be photographed and attached to a stock of the photographing housing, and a means for sending clear water (fresh water) into the photographing housing. An underwater imaging device is disclosed. In this device, transparent water is sent into the photographing housing to replace the inside of the photographing housing and the portion covered with the three-dimensional photographing attachment with transparent water, and then image is taken.

Japanese Unexamined Patent Publication No. 2015-214335 Japanese Patent No. 3079321 Japanese Unexamined Patent Publication No. 2005-195712

However, in the device disclosed in Patent Document 1, it is necessary to repeatedly expand and contract the sealing device every time the inspection target surface is changed, so that the work is complicated and it takes a long time if the inspection target surface is wide. There was a problem. Further, when the first translucent portion is brought into contact with the surface to be inspected, the first translucent portion is damaged, and if the first translucent portion is too far from the surface to be inspected, good imaging cannot be performed due to the turbid water between them.

Further, even in the apparatus disclosed in Patent Document 2, since it is necessary to repeatedly fill the transparent sheet with fresh water every time the inspection surface is changed, the work is complicated, and if the inspection surface is wide, it takes a long time. There was a problem that it took. Further, if the transparent sheet is thin, there is a high possibility that it will be damaged, and if it is thick, good imaging cannot be performed.

Further, even in the apparatus disclosed in Patent Document 3, the work is complicated because it is necessary to replace the inside of the part covered with the photographing housing and the attachment for stereoscopic photography with clear water every time the image pickup object is changed. There is a problem that it takes a long time when the object to be imaged is a wide range. Further, since the transparent water sent into the photographing housing is diffused by the water flow diffusion group, it takes time until the photographing becomes possible. Further, since the partition plate is removed after replacement with clear water and the clear water and the water directly above the sand mud are mixed, there is a possibility that a good image cannot be obtained due to the inferior transparency.

In view of the above points, it is an object of the present invention to provide an apparatus and method suitable for investigating the inner wall surface of a muddy water pit.

The turbid water pit investigation device of the present invention is an apparatus for investigating the inner wall surface of the turbid water pit, and is a main body case provided with an imaging means in the internal space and a first fresh water for supplying fresh water to the internal space of the main body case. The supply means, the cushioning means which is attached to the front side of the main body case and whose front surface abuts on the inner wall surface so as to surround the imaging range on the inner wall surface by the imaging means, and the area surrounded by the buffering means are drained. It is characterized by including a drainage means for supplying fresh water and a second fresh water supply means for supplying fresh water in the area surrounded by the buffer means.

According to the turbid water pit investigation device of the present invention, when the internal space of the main body case is filled with the fresh water supplied by the first fresh water supply means, the investigation device moves and the area surrounded by the buffer means is formed. It will be maintained even if it changes. Therefore, when this region is changed, if the region is filled with fresh water or highly transparent water by supplying fresh water into the region by the second fresh water supply means, the imaging range is improved by the imaging means. It is possible to carry out a survey in a short time as compared with a device that needs to replace the inside of the main body case with fresh water or the like.

In the muddy water pit investigation device of the present invention, it is preferable to provide a drain valve capable of discharging the water in the main body case to the outside.

In this case, if fresh water is continuously supplied to the internal space of the main body case by the first fresh water supply means, excess fresh water in the internal space is discharged from the drain valve, so that the excess fresh water in the internal space is discharged from the outside into the internal space. It is possible to prevent the inflow of turbid water.

Further, in the turbid water pit investigation device of the present invention, it is preferable to include a wire guide attached to the main body case through which a guide wire can be inserted.

In this case, by providing the guide wire at an appropriate position in the muddy water pit in advance, it is possible to move the survey device along a desired route along the guide wire. Further, as a result, the investigation device can be moved while pressing the buffering means against the inner wall surface, so that turbid water can be prevented from entering the region from the outside, and the transparency of the region can be maintained.

Further, in the turbid water pit investigation device of the present invention, it is preferable to provide a lighting means provided in the internal space of the main body case to illuminate the imaging range.

In this case, as compared with the device provided with the lighting means outside the main body case, the lighting is not obstructed by the muddy water, so that the imaging range can be suitably illuminated.

The method for investigating a muddy water pit of the present invention is a method for investigating the inner wall surface of a muddy water pit by using a device provided with a main body case provided with an imaging means in an internal space and a buffer means attached to the front side of the main body case. In the step of filling the inside of the main body case with fresh water, and in a state where the front surface of the cushioning means is in contact with the inner wall surface, the fresh water is supplied to the region where the outer periphery is taken in by the buffering means. It is characterized by including a step of discharging water in the region and a step of imaging the inner wall surface by the imaging means.

According to the method for investigating a muddy water pit of the present invention, the state in which the inside of the main body case is filled with fresh water is maintained even if the investigating device moves and the area surrounded by the buffer means changes. Therefore, when this region changes, by supplying fresh water into the region, if the region is filled with fresh water or highly transparent water, the inner wall surface can be imaged satisfactorily by the imaging means. It is possible to conduct a survey in a shorter time than in the case where it is necessary to replace the inside of the main body case with fresh water or the like.

If fresh water is continuously supplied to the internal space of the main body case and excess fresh water in the internal space is discharged, turbid water can be prevented from flowing into the internal space from the outside, and the internal space can be prevented from flowing into the internal space. It is preferable because the transparency of the above can be maintained.

In the method for investigating a muddy water pit of the present invention, it is preferable to include a step of providing a guide wire along the inner wall surface and a step of raising and lowering the main body case along the guide wire.

In this case, by providing the guide wire at an appropriate position in the muddy water pit in advance, it is possible to move the survey device along a desired route along the guide wire. Further, as a result, the investigation device can be moved while pressing the buffering means against the inner wall surface, so that turbid water can be prevented from entering the region from the outside, and the transparency of the region can be maintained.

Further, in the method for investigating a muddy water pit of the present invention, it is preferable to include a step of supplying fresh water into the main body case and discharging the water in the main body case to the outside.

In this case, it is possible to prevent turbid water from flowing into the main body case from the outside.

The schematic front view of the investigation apparatus of the muddy water pit which concerns on embodiment of this invention. FIG. 2 is a schematic cross-sectional arrow view taken along line II-II of FIG. FIG. 3 is a schematic cross-sectional arrow view taken along line III-III of FIG. The flowchart which shows the investigation method of the muddy water pit which concerns on embodiment of this invention. Schematic side view showing a state in which the guide wire is installed along the muddy water pit. A schematic side view showing a state in which the internal space of the main body case is filled with fresh water. Schematic side view showing a state in which the survey device is lowered to the bottom of the muddy water pit. The schematic side view which shows the state which raised the investigation device.

The muddy water pit investigation device 100 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3.

The investigation device 100 is an apparatus for investigating the deterioration state of the inner wall surface B by photographing the surface (inner wall surface) B of the vertical inner wall of the muddy water pit A. The deterioration state of the inner wall surface B is investigated by a researcher or the like visually observing the image of the inner wall surface B or by performing an image analysis. The inner wall surface B of the muddy water pit A may be substantially vertical, and may have some irregularities, steps, slopes, and the like.

The muddy water pit A is a facility for performing pretreatment for discharging factory wastewater to the outside, and its main body is made of a concrete skeleton.

The survey device 100 includes a main body device 10, a cushioning material (cushioning means) 20, an external water supply device (second fresh water supply means) 30, a lifting tool 40 for raising and lowering, and a guide 50 for raising and lowering.

In the present application, fresh water means water having low turbidity and high transparency. The fresh water area means a region having higher transparency than the turbid water area consisting of turbid water stored in the turbid water pit A, and is turbid if a sufficient field of view is secured to the extent that it does not interfere with imaging. You may be.

The main body device 10 includes a box-shaped main body case 11. The main body case 11 is assembled by welding a metal plate such as steel or using bolts, and has a waterproof structure.

An imaging means 12 is installed in the internal space S1 of the main body case 11. Here, the imaging means 12 is fixed to the inner surface near the center of the back plate of the main body case 11 by fixing means such as a screw (not shown) so that the imaging direction faces forward. The imaging means 12 is, for example, a camera that acquires an image, or a video that acquires an image, and is preferably rechargeable and has a waterproof function so that it can be used underwater for a certain period of time. As the imaging means 12, for example, a commercially available underwater camera, an underwater video, a portable terminal device having a waterproof function, or the like can be used.

The image pickup means 12 transmits information of an image or video (hereinafter referred to as an image or the like) to an image processing device provided with an image display device or the like installed on the ground or the like wirelessly or by wire, even if the image or the like is transmitted. It may be provided with a storage device for storing the information of.

A lighting means 13 is further installed in the internal space S1 of the main body case 11. Here, a plurality of the lighting means 13 are fixed to the inner surface on the front side of the upper surface plate and the lower surface plate of the main body case 11 by fixing means such as screws (not shown) so as to illuminate the front. The lighting means 13 is preferably rechargeable and has a waterproof function, for example. As the lighting means 13, for example, a commercially available underwater halogen light, an underwater LED light, or the like can be used.

An opening 11a is formed in the front plate of the main body case 11, and a transparent or translucent plate-shaped transparent plate 14 is formed on the front plate so as to cover the entire opening 11a from the front side (outside). It is fixed using a fixing means such as. The transparent plate 14 is made of, for example, an engineering plastic such as acrylic, glass, or polycarbonate.

There is no gap between the transparent plate 14 and the front plate, and the fluid is configured so as not to flow inside and outside the main body case 11 through the gap. The imaging means 12 images the front through the opening 11a and the transparent plate 14, and the transparent plate 14 functions as a window for imaging. When the main body case 11 is made of a transparent material, it is not necessary to provide the opening 11a and the transparent plate 14.

Since the illuminating means 13 illuminates the imaging range located in the front central portion through the opening 11a and the transparent plate 14, the illuminating means 13 illuminates toward the center in the vicinity of the front side so as to enhance the illuminating effect. It is preferable to install it at an angle. The lighting means 13 may be provided outside the main body case 11, but in this case, the imaging range is illuminated through turbid water, so that the illumination effect is inferior. In addition, the illumination may be reflected on the transparent plate 14, which may interfere with imaging. Further, by providing the lighting means 13 inside the main body case 11, it is possible to reduce the size and simplification of the survey device 100. The gap between the transparent plate 14 and the inner wall surface B can be reduced.

The wall on the back surface of the main body case 11 is preferably configured so that the left and right walls are inclined from the central portion toward the left and right outside. As a result, it is possible to prevent the back surface of the main body case 11 from being reflected on the transparent plate 14 due to the light reflected by the transparent plate 14. Further, in order to suppress reflection on the back surface of the main body case 11, it is preferable to paint the back surface in a dark color such as black.

The internal space S1 of the main body case 11 is filled with fresh water. Therefore, an internal water supply device (first fresh water supply means) 15 for supplying fresh water to the internal space S1 is connected to the main body case 11. Although not shown, the internal water supply device 15 is formed on a water supply tank installed on the ground, a flexible hose 15a connected to the water supply tank, and here an inclined back wall of the main body case 11, and the hose 15a is formed. It is composed of a water supply port 15b and the like to be connected.

A drain valve 16 that opens only to the outside is installed on the upper wall of the main body case 11, and the excess water in the internal space S1 of the main body case 11 is configured to be discharged from the drain valve 16. As a result, the water pressure in the internal space S1 of the main body case 11 becomes higher than that of the outside, so that turbid water is prevented from entering the internal space through gaps between the members of the main body case 11, and the internal space S1 is regarded as a fresh water area. It becomes easy to maintain the state.

By making the internal space S1 of the main body case 11 a fresh water area filled with fresh water, it is possible to easily submerge the investigation device 100 in muddy water and prevent image distortion due to light reflection and refraction by the transparent plate 14. Become.

Further, in order to drain the internal space S1 of the main body case 11 after the work is completed, a drainage port 17 that can be opened and closed is provided on the lower wall of the main body case 11.

The cushioning material 20 is attached to the front side of the main body case 11 and is composed of an annular elastic body whose front surface abuts on the inner wall surface B so as to surround the imaging range on the inner wall surface B by the imaging means 12. When the front surface of the cushioning material 20 comes into contact with the inner wall surface B, a virtual space S2 surrounded by the cushioning material 20 is formed between the transparent plate 14 of the main body device 10 and the inner wall surface B. The cushioning material 20 is formed of a highly flexible elastic body such as foam rubber or epoxy rubber.

The cushioning material 20 is water resistant to the front portions of a plurality of support members 21 fixed to the front surface of the main body case 11 by means of fixing means (not shown) such as bolts so that the cushioning material 20 is installed on the front surface of the main body case 11. It is fixed by the adhesive of. The support member 21 is, for example, an L-shaped steel piece.

Here, the covering material 22 is provided so as to cover the gap between the support members 21 provided on the upper side and both the left and right sides. The covering material 22 is, for example, a rubber plate, and is fixed to the main body case 11 or the support member 21 by a fixing means such as a water-resistant adhesive. As a result, water does not flow from the upper side and the left and right sides of the space S2 between the main body device 10 and the cushioning material 20 inside and outside the space S2. On the other hand, on the lower side of the space S2 between the main body device 10 and the cushioning material 20, a gap M is formed between the support members 21, and water in the space S2 flows in and out through the gap M. It has become like. Then, this gap M functions as a drainage port and corresponds to the drainage means of the present invention. A notch may be provided in a part of the cushioning material 20, and this notch may correspond to the drainage means of the present invention. Further, the gap M may be provided with a valve that opens only to the outside.

The external water supply device 30 supplies fresh water into the space S2. Although not shown, the internal water supply device 30 is attached to a water supply tank installed on the ground, a flexible hose 30a connected to the water supply tank, and a metal plate metal fitting (not shown) on the front side of the main body case 11. It is composed of a water supply pipe 30b or the like which is attached by an attachment means or the like used when fixing a vinyl chloride pipe made of a screw and to which a hose 30a is connected.

The water supply pipe 30b is provided with a plurality of ejection holes along the extending direction of the water supply pipe 30b so as to eject fresh water toward the front center side. Then, the fresh water flowing through the water supply pipe 30b is ejected toward the front central portion through each ejection hole.

It is preferable that the water supply pipes 30b are installed on the upper side and the left and right sides of the main body device 10, but not on the lower side. As a result, low-transparency water such as turbid water in the space S2 is effectively discharged from the gap M, and external turbid water is effectively prevented from entering the space S2 through the gap M. It becomes easy to improve the transparency of water.

In order to shorten the time required to replace the turbid water in the space S2 with fresh water, the thickness of the space S is preferably thin, for example, 1 cm to 5 cm. Then, in order to reduce the thickness of the space S2, a recess is provided between the support member 21 and the transparent plate 14, and it is preferable that the water supply pipe 30b is housed in this recess. Further, in order to shorten the time required for replacement of turbid water and fresh water, it is preferable that the injection pressure of fresh water into the water supply pipe 30b is as strong as possible so as not to affect the survey.

A plurality of hanging tools 40 for which the tips of hanging wires and ropes (hereinafter collectively referred to as hanging wires and the like) 60 are locked are symmetrically installed on the upper part of the main body case 11. The survey device 100 winds or unwinds the lifting wire or the like 60 via the mast 61 by a hoist (not shown) installed on the ground or on a temporary scaffold C (see FIGS. 5 to 8) or on the pedestal of a mobile heavy machine. It is raised and lowered by.

Guides 50 through which the guide wires 70 are inserted are installed on the left and right sides of the main body case 11, respectively. The survey device 100 moves up and down along the guide wire 70. The guide wire 70 is raised and lowered by being wound or unwound by a hoist (not shown) installed on the ground or on a temporary scaffold C or the like. As the hoist that raises and lowers the hanging wire 60 or the guide wire 70, for example, a commercially available hoist, chain block, or the like can be used.

A weight 71 (see FIGS. 5 to 8) is fixed to the lower end of the guide wire 70. The upper end of the guide wire 70 provided along the inner wall surface B of the muddy water pit A is fixed to a mast 72 (see FIG. 5) installed on the ground, a temporary scaffold C, or a pedestal of a mobile heavy machine. It is preferable that the fixed end of the guide wire 70 to the mast 72 is installed slightly outside the muddy water pit A than the weight 71. As a result, the guide wire 70 is slightly inclined toward the outside of the muddy water pit A, the cushioning material 20 is constantly pressed against the inner wall surface B, and the formation of the space S2 by the cushioning material 20 is ensured.

Further, the straight line connected to the fixed end of the guide wire 70 of the mast 72 by the weight 71, that is, the separation distance between the guide wire 70 and the inner wall surface B is the distance between the elevating guide 50 of the main body device and the inner wall surface side of the buffer 20. It may be installed so as to be shorter than the distance. As a result, the guide wire 70 becomes convex inward of the pit, the buffer 20 is constantly pressed against the inner wall surface B, and the space S2 is surely formed by the buffer 20.

Hereinafter, a method for investigating a turbid water pit according to an embodiment of the present invention using the above-mentioned investigation device 100 will be described with reference to drawings such as a flowchart of FIG.

Before performing this survey method, it is preferable that the operator cleans the portion of the inner wall surface B of the muddy water pit A to be surveyed with a cleaning tool such as a drainer or a brush. Further, the cleaning tool may be fixed to the front side of the weight 71, and the inner wall surface B may be cleaned when the weight 71 is submerged.

First, as shown in FIG. 5, the guide wire installation step STEP1 in which the guide wire 70 is installed along the inner wall surface B of the muddy water pit A is performed. In this guide wire installation step STEP1, the guide wire 70 having the weight 71 fixed to the tip thereof is moved to the outside of the muddy water pit A by using the hoisting machine so that the fixed end of the guide wire 70 to the mast 72 is slightly outside the weight 71. It is preferable to install it so that At this time, the worker may pull the tip of the mast 72 to the outside of the turbid water pit A, or may pull the upper part of the guide wire 70 to the outside of the turbid water pit A.

Since the weight 71 is fixed to the tip of the guide wire 70, the survey device keeps the guide wire 70 stationary even when a water flow exists in the muddy water pit A, and is eventually guided by the guide wire 70. It is possible to improve the stability of 100.

Next, as shown in FIG. 6, the main body water supply step STEP2 is performed in which the internal space STEP1 of the main body case 11 is filled with fresh water by the internal water supply device 15. In the main body water supply step STEP2, it is not necessary to completely fill the internal space S1 of the main body case 11 with fresh water, and the inside of the internal space S1 may be substantially filled with fresh water until the entire main body case 11 is submerged in water.

Next, as shown in FIG. 7, the descent step STEP3 in which the investigation device 100 is lowered to the bottom wall of the muddy water pit A along the guide wire 70 in a state where the internal space S1 of the main body case 11 is filled with fresh water. I do. In the lowering step STEP3, the investigation device 100 in a state where the guide wire 70 is inserted through the guide 50 is lowered, and the hanging wire or the like 60 whose tip is fixed to the hanging tool 40 is lowered by using the hoisting machine.

As a result, in the survey device 100 located on the bottom wall of the turbid water pit A, the front surface of the cushioning material 20 is in contact with the inner wall surface B so as to be pressed against the transparent plate 14 of the main body device 10 and the inner wall surface B. A space S2 surrounded by a cushioning material 20 is formed between them.

Next, the fresh water replacement step STEP4 in which the internal water supply device 15 supplies fresh water to the internal space S1 of the main body case 11 and the fresh water is supplied into the space S2 by the external water supply device 30 to replace the turbid water in the space S2 with fresh water. I do. By supplying fresh water to the internal space S1 of the main body case 11 by the internal water supply device 15, turbid water is prevented from entering the internal space S1 from the outside, and the excess fresh water in the internal space S1 is a drain valve. Since it is discharged from 16, it becomes easy to maintain the inside of the internal space S1 in the fresh water area.

Further, since the external water supply device 30 supplies fresh water into the space S2, the turbid water or the water having low transparency in the space S2 is discharged to the outside through the gap M, and the space S2 becomes a fresh water area.

Next, the imaging step 12 performs an imaging step STEP5 in which the imaging range on the inner wall surface B is photographed by the imaging means 12. In the imaging step STEP5, the imaging range is illuminated by the illumination means 13.

Next, as shown in FIG. 8, the ascending step STEP6 for ascending the investigation device 100 is performed. In the raising step STEP6, the hanging wire or the like 60 is raised by using the hoisting machine.

Then, steps STEP4 to STEP6 are repeated until the inner wall surface B of the muddy water pit A is imaged over the entire height (STEP7: YES).

When the imaging over the entire height of the inner wall surface B of the muddy water pit A is completed (STEP 7: YES), the guide wire installation step STEP 1 is performed so that the guide wire 70 is installed at a position shifted in the lateral direction. Then, steps STEP3 to STEP6 are repeated until the inner wall surface B of the muddy water pit A is imaged over the entire height (STEP7: YES). Then, the above is repeated until the imaging of the target range of the inner wall surface B of the muddy water pit A is completed (STEP 8: YES). The imaging range may be limited to this range as long as the range in which damage is predicted is specified in advance, and does not necessarily have to cover the entire inner wall surface B.

After pulling up the investigation device 100, the drainage port 17 is opened to perform a drainage step of discharging all the water in the internal space S1 of the main body case 11, and then the main body water supply step STEP2 is performed to perform the internal space. S1 may be filled with fresh water. However, since the water in the drawn main body case 11 is sufficiently filled with highly transparent water, these steps may be omitted.

Further, when the imaging means 12 is a video, steps STEP4 to STEP6 may be continuously performed. In this case, the ascending speed of the investigation device 100 may be such that the deterioration state of the inner wall surface B can be confirmed.

As described above, according to the muddy water pit survey device 100 and the survey method using the turbid water pit according to the embodiment of the present invention, fresh water is continuously supplied into the internal space S1 of the main body case 11, so that the survey device 100 Even if the value rises, the state in which the internal space S is a fresh water area is maintained. Then, since the investigation device 100 is raised while the cushioning material 20 is in contact with the inner wall surface B and fresh water is continuously supplied into the space S2, turbid water is prevented from entering the space S area from the outside, and the space S2 is prevented from entering. Is maintained in the fresh water area.

As a result, the inner wall surface B can be satisfactorily imaged by the image pickup means 12 through the highly transparent internal space S1 and space S2, both of which are in the fresh water area. Therefore, it is possible to carry out the investigation in a short time as compared with the case where it is necessary to replace the inside of the main body case 11 with fresh water or the like. Further, once the replacement is completed, it is only necessary to prevent the invasion of turbid water from the outside after that, so that the fresh water may be supplied little by little at the same pressure as the water pressure at the survey position.

A gap M is formed on the lower side of the space S2, but since the survey device 100 is raised, there is little possibility that turbid water will enter the space S2 from the gap M as the investigation device 100 is moved. Further, since fresh water is jetted into the space S2 from the upper side and both the left and right sides toward the center, the water existing in the space S2 is easily discharged from the lower gap M, so that the transparency in the space S2 is increased. It is possible to improve efficiently.

However, the image may be taken while the investigation device 100 is lowered. In this case, it is preferable to form a gap M on the upper side of the space S2.

The present invention is not limited to the muddy water pit investigation device 100 specifically described in the above-described embodiment and the method using the investigation device 100, and may be within the scope of claims. If so, it can be changed as appropriate.

10 ... Main unit, 11 ... Main case, 11a ... Opening, 12 ... Imaging means, 13 ... Lighting means, 14 ... Transparent plate, 15 ... Internal water supply device (first fresh water supply means), 15a ... Hose 15, 15b ... Water supply port, 16 ... Drain valve, 17 ... Drain port, 20 ... Cushioning material (cushioning means), 21 ... Support member, 22 ... Covering material, 30 ... External water supply device (second fresh water supply means), 30a ... Hose, 30b ... Water supply pipe, 40 ... Hanging tool, 50 ... Guide, 60 ... Hanging wire, etc. 61 ... Mast, 70 ... Guide wire, 71 ... Weight, 72 ... Mast, 100 ... Muddy water pit investigation device, A ... Muddy water Pit, B ... Inner wall surface, C ... Temporary scaffolding, M ... Gap (drainage means), S1 ... Internal space, S2 ... Space (area surrounded by cushioning means).

Claims (7)

A device for investigating the inner wall surface of a muddy water pit.
A main body case with an imaging means in the internal space,
A first fresh water supply means for supplying fresh water to the internal space of the main body case,
A cushioning means that is attached to the front side of the main body case and whose front surface abuts on the inner wall surface so as to surround the imaging range on the inner wall surface by the imaging means.
A drainage means for draining the area surrounded by the buffer means, and a drainage means.
A muddy water pit investigation device comprising a second fresh water supply means for supplying fresh water in the area surrounded by the buffer means. The muddy water pit investigation device according to claim 1, further comprising a drain valve capable of discharging water in the main body case to the outside. The muddy water pit investigation device according to claim 1 or 2, further comprising a wire guide attached to the main body case through which a guide wire can be inserted. The muddy water pit investigation device according to any one of claims 1 to 3, which is provided in the internal space of the main body case and includes an illumination means for illuminating the imaging range. It is a method of investigating the inner wall surface of a muddy water pit by using a device provided with a main body case provided with an imaging means in an internal space and a cushioning means attached to the front side of the main body case.
The process of filling the inside of the main body case with fresh water,
A step of discharging the water in the region while supplying fresh water into the region where the outer circumference is taken in by the buffer means in a state where the front surface of the buffer means is in contact with the inner wall surface.
A method for investigating a muddy water pit, which comprises a step of imaging the inner wall surface by the imaging means. The process of providing a guide wire along the inner wall surface and
The method for investigating a muddy water pit according to claim 5, further comprising a step of raising and lowering the main body case along the guide wire. The method for investigating a muddy water pit according to claim 5 or 6, further comprising a step of supplying fresh water into the main body case and discharging the water in the main body case to the outside.

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