JP7097185B2 - Cavity imaging device and concrete foundation inspection method - Google Patents

Description

The present invention relates to an in-cavity imaging device and a method for inspecting a concrete foundation. More specifically, the present invention relates to an in-cavity photographing device for inspecting the condition inside a cavity formed in a building such as a concrete foundation, a pier, and an outer wall, and an inspection method for a concrete foundation.

A boring survey may be conducted as a method of confirming the condition of the ground or concrete foundation (hereinafter referred to as the ground, etc.). In the boring survey, soil, etc. from the surface of the ground to a certain depth is taken into a pipe, etc., and the taken-in sample (boring core) is investigated. On the other hand, since the boring core is removed from the actual ground or the like, the sample is in a state where there is no pressure applied to the actual ground or the like. Therefore, if the diameter of the boring core is large to some extent, it may be possible to grasp the soil quality at each position of the sample, the presence or absence of cracks in the ground, and the position of the cracks from the boring core. However, in a boring core with a small diameter, the core may be broken by the force of the cutter when removing the core. Further, in a deteriorated concrete foundation, the boring core may not be able to maintain its shape when it is removed from the ground or the like. Then, although the soil quality and the like at each position of the sample can be grasped, the presence or absence of cracks in the ground and the like and the position of the cracks cannot be grasped.

As a method for surely grasping defects such as cracks in the ground or the like, there is a method of inserting a camera into a hole formed by boring and photographing the inner wall surface of the hole. The device described in Patent Document 1 has been developed as a device used in such a method, that is, a device inserted into a hole formed in the ground or the like to photograph the inside. This device includes a camera storage unit equipped with a camera and a reflector, and a cylindrical head unit having a window on the side surface, and the device is inserted into a hole with the camera storage unit housed in the head unit. The structure is such that the wall surface of the hole is photographed. Specifically, in this device, when the camera housing portion is inserted into the hole in the head portion, the optical axis of the camera is arranged so as to be parallel to the axial direction of the hole. The reflector is attached to the camera storage portion so that when the camera storage portion is inserted into the head portion, the reflector is arranged at a position corresponding to the window of the head portion. Moreover, the reflecting mirror is provided so that its reflecting surface is about 45 ° with respect to the optical axis of the camera. Therefore, in the device of Patent Document 1, the wall surface of the hole reflected on the reflecting surface of the reflecting mirror can be photographed by the camera through the window of the head portion.

However, in the apparatus of Patent Document 1, only the wall surface of the hole located on the side of the apparatus can be observed. Therefore, if an obstacle or the like exists in front of the apparatus, the obstacle is obstructed until the apparatus comes into contact with the obstacle. I can't figure out if it's there. Then, the contact between the obstacle and the device may damage the device, or the device may be caught by an obstacle in the hole and the device may not be removed from the hole.

Therefore, a device has been developed that can photograph not only the side of the device but also the front of the device (see Patent Document 2). Patent Document 2 discloses a device in which a convex mirror is provided at the tip thereof and a camera is provided so that the convex mirror can be approached and separated from the convex mirror. Further, in Patent Document 2, when the camera is brought close to the convex mirror, the inner wall of the hole can be photographed through the convex mirror, and when the camera is separated from the convex mirror, the situation in front of the device can be photographed from the space on the side of the convex mirror. There is a statement to that effect.

Japanese Unexamined Patent Publication No. 2000-145350 Japanese Unexamined Patent Publication No. 6-94452

However, in the technique of Patent Document 2, even if the camera is separated from the convex mirror, the convex mirror still exists in front of the camera, and even if the front of the device can be photographed, only a limited range can be photographed. Specifically, even if the camera is separated from the convex mirror, only the inner wall located slightly in front of the convex mirror can be photographed.

Moreover, in the case of the technique of Patent Document 2, it is not possible to confirm the front and the side at the same time. For this reason, after an overview of the condition of the inner wall of the hole with a forward view, it is necessary to confirm the condition of the inner wall of the hole with a lateral view again, which requires extra inspection time.

In view of the above circumstances, the present invention provides an in-cavity imaging device and a method for inspecting a concrete foundation, which can perform imaging in a cavity quickly and in a short time.

The in-cavity imaging device of the first invention is a device that is inserted into the cavity and photographs the inside of the cavity, and is formed so that the maximum diameter of the cross section extending in the axial direction is substantially the same as the diameter of the cavity. A front imaging section for photographing the front of the case portion provided at the tip portion of the case portion, and a lateral imaging section for photographing the inner wall of the cavity provided behind the front photographing section. The side photographing unit and the front photographing unit can photograph images separately, and the case unit includes the front photographing unit and the side photographing unit. It has two annular plate groups that each hold, and a plurality of plate-shaped connecting frames that connect the two annular plate groups so that the central axes of the two annular plate groups are coaxial. The annular plate group has a plurality of annular plates having a plate shape and an annular shape, and the plurality of annular plates so that the center thereof is located on the central axis of the annular plate group. It is provided with a plurality of plate-shaped frame plates connected to each other at intervals along the central axis direction, and the plurality of frame plates have a longitudinal direction thereof as the central axis of the annular plate group. It is arranged so as to be parallel to the central axis of the annular plate group and radially with respect to the central axis of the annular plate group when viewed from the central axis direction of the annular plate group, and has a plurality of outer edge edges. The plurality of connecting frames are arranged so as to project from the outer edge of the annular plate and the distance from the outer edge to the central axis of the annular plate group is the same. Arranged so that its longitudinal direction is parallel to the central axis of the annular plate group and radially with respect to the central axis of the annular plate group when viewed from the central axis direction of the annular plate group. And the outer edge is protruding from the outer edge of the plurality of annular plates, and the distance from the outer edge to the central axis of the annular plate group is outside the plurality of frame plates. It is arranged so as to be the same distance as the distance from the edge to the central axis of the annular plate group, and the front photographing portion and the side photographing portion are the plurality of the plurality of the annular plate group. It is characterized in that it is arranged in the internal space surrounded by the frame plate of .
In the first invention, the case portion of the cavity photographing apparatus of the second invention is formed so that the maximum diameter of the cross section thereof is substantially the same as the diameter of the cavity, and the side photographing portion is an optical axis. It includes a camera whose axis is arranged so as to be substantially coaxial with the central axis of the case portion , and a reflecting mirror which is arranged on the front side of the camera and has a reflecting surface intersecting the optical axis of the camera. An observation window that communicates between the space inside the case and the space outside the case is provided, and the observation window utilizes the reflection of the reflecting surface of the reflecting mirror to form an inner wall of the cavity of the camera. It is characterized in that it is provided at a position where it can be photographed.
The cavity photographing apparatus of the third invention is characterized in that, in the first or second invention , the liquid supply apparatus for supplying a liquid into the cavity is provided.
In the third aspect of the invention, the in-cavity imaging device of the fourth invention is a liquid supply device in which the liquid supply device supplies liquid from a liquid feed tube having one end arranged in the case portion and the other end of the liquid feed tube. It is characterized by having.
The in-cavity imaging device of the fifth invention is an apparatus for photographing the inside of a cavity having a diameter of 32 to 40 mm formed on a concrete foundation in any one of the first to fourth inventions , and the outer diameter is larger than the diameter of the cavity. Is also characterized in that it is formed so as to be smaller by 0.5 to 4 mm .
In the fifth aspect of the invention , the cavity photographing apparatus of the sixth invention is formed so that the concrete foundation has a smaller cross-sectional area from the bottom to the upper part, and the cavity is inclined with respect to the vertical direction. It is characterized by being a hole.
(Inspection method for concrete foundation)
In the method for inspecting a concrete foundation of the seventh invention , a hole is formed from the surface of the concrete foundation, and the cavity photographing apparatus of the first or second invention is inserted through the opening of the hole formed on the surface of the concrete foundation, and the inside of the cavity is inserted. It is characterized in that the photographing device is moved along the hole to photograph the inner surface of the hole.
In the seventh invention , the method for inspecting a concrete foundation according to the eighth invention is such that the concrete foundation is formed so that the cross-sectional area decreases from the bottom to the top, and the diameter of the concrete foundation is oblique with respect to the vertical direction. It is characterized by forming a hole of 32 to 40 mm .
In the method of inspecting the concrete foundation of the ninth invention , in the seventh or eighth invention , after blowing gas into the hole to dry the inner wall of the hole, the cavity photographing apparatus of the first or second invention is inside the hole. It is characterized by being inserted into.
In the seventh, eighth, or ninth invention , the method for inspecting a concrete foundation according to the tenth invention is to insert an air supply pipe into the hole so that one end is located near the inner bottom surface of the hole, and gas from the other end of the air supply pipe. It is characterized by supplying.
The method for inspecting a concrete foundation according to the eleventh invention is the method of inspecting the concrete foundation according to the seventh, eighth, ninth or tenth invention in a state where the in-cavity photographing apparatus according to any one of the first to fifth inventions is inserted into a hole. It is characterized by supplying a liquid into the pores.

According to the first invention, since the image in front of the case and the image on the side can be taken at the same time, the state of the inner wall of the cavity can be taken while checking the situation in front of the case. Therefore, in a situation where an obstacle or the like exists in the cavity, even if the device is moved in the cavity while photographing the state of the inner wall of the cavity, the device may be damaged due to the contact between the obstacle and the device, or the device may be in the hole. It is possible to prevent the device from being caught in an obstacle or the like and being unable to be removed from the hole. In addition, after roughly grasping the state of the inner wall of the cavity from the image taken by the front photographing unit, the inner wall of the cavity can be photographed in detail by the side photographing unit immediately, so that the accuracy and speed of photography can be improved. .. Further, even if the inner wall of the cavity has irregularities or the like, the case portion will not be caught, and even if foreign matter enters the inside of the case portion, it can be discharged to the outside of the case portion. Therefore, it is possible to stably continue photographing the inner wall of the cavity.
According to the second invention , since the case portion can be stably arranged in the cavity, the device can be stably moved in the cavity even if the cavity is non-vertical. In addition, since an image can be taken under substantially the same conditions by the lateral photographing unit at any position in the circumferential direction of the cavity, the accuracy of the inspection using the photographed image can be improved.
According to the third and fourth inventions , even if a turbid liquid is accumulated in the cavity, the turbid liquid can be replaced with the liquid supplied from the liquid supply device. When the liquid in the cavity becomes a liquid with less turbidity, the inside of the cavity can be photographed through the liquid.
According to the fifth and sixth inventions , even if the core removed when forming the cavity is easily damaged, cracks in the concrete foundation can be grasped by photographing the inside of the cavity.
(Inspection method for concrete foundation)
According to the 7th and 8th inventions , a hole is formed in the concrete foundation, an imaging device is inserted in the hole, and the inside of the hole is photographed. Therefore, the inside of the concrete foundation can be inspected easily and in a short time. can.
According to the ninth invention , since the dampness of the inner wall of the cavity can be reduced, it is possible to prevent the inner wall of the cavity from becoming a glaring image due to the illumination of the camera as in the case where water is present in the inner wall of the cavity. It becomes easier to observe cracks.
According to the tenth and eleventh inventions , even if a turbid liquid is accumulated in the cavity, the liquid in the cavity can be made into a liquid with less turbidity, so that the inside of the cavity can be photographed through the liquid.

It is a schematic explanatory drawing of the cavity photographing apparatus 1 of this embodiment. It is schematic explanatory drawing which looked at the cavity photographing apparatus 1 of this embodiment from the side. FIG. 2 is a schematic cross-sectional view taken along the line III-III of FIG. (A) is a schematic cross-sectional view taken along the line IVA-IVA of FIG. 3, and (B) is a schematic cross-sectional view taken along the line IVB-IVB of FIG. It is a schematic plan view of the cavity photographing apparatus 1 of this embodiment provided with a holding shaft 3. It is a schematic explanatory drawing of the cavity photographing apparatus 1 provided with the liquid supply apparatus 20 . It is a schematic diagram of the situation where the cavity h formed in the concrete foundation B is inspected by the cavity photographing apparatus 1 of the present embodiment. It is a schematic explanatory view of the image taken when the cavity h formed in the concrete foundation B is photographed by the cavity photographing apparatus 1 of this embodiment, (A) is a forward photographed image, (B) is. It is a side shot image. (A) is a schematic explanatory view of the work of inspecting the inner wall w of the cavity h by the in-cavity photographing apparatus 1 of the present embodiment after drying the inner wall w of the cavity h by the air supply tube AB, and (B) is a liquid supply . It is a schematic explanatory diagram of the work of inspecting the inner wall w of the cavity h by the cavity imaging apparatus 1 provided with the apparatus 20 . It is a schematic explanatory view of the image taken when the cavity h formed in the concrete foundation B is photographed by the cavity imaging apparatus 1 of this embodiment, and (A) is the image in the state where the inner wall w is wet. Yes, (B) is an image after the inner wall w has been dried. It is a schematic explanatory view of the image taken when the cavity h formed in the concrete foundation B is photographed by the cavity imaging apparatus 1 of this embodiment, and (A) is the crack connected to the concrete foundation in the cavity h. It is an image taken in a state where the groundwater invaded from the above, etc. is accumulated, and (B) is an image taken while supplying clean water from the outside into the cavity h.

The in-cavity photographing apparatus of the present invention is an apparatus for photographing the inside of a cavity formed in a concrete foundation or the like, and is characterized in that it can photograph the sides and the front at the same time.

The cavity photographed by the cavity photographing apparatus of the present invention is not particularly limited. For example, it should be used for photographing the inside of holes formed in concrete foundations, holes formed in concrete wall surfaces, holes formed in structures, etc. (hereinafter referred to as holes formed in concrete foundations, etc.). Can be done. Generally, when forming a hole for inspecting the condition of concrete, three types of hole diameters of 66, 86, and 116 mm are common. The in-cavity imaging device of the present invention can be used for photographing the inside of a hole having such a size, and even if the diameter of the hole is larger than 116 mm, the inside of the hole of the present invention can be photographed. The device can be used.

On the other hand, in the case of a reinforced concrete structure, that is, a structure in which structural bars are arranged inside, it is necessary to form a hole so as to pass through a narrow gap between the structural bars. In order to form a hole in such a structure so as not to hit the reinforcing bar (in other words, not to damage the reinforcing bar), it is necessary to form a hole having a diameter smaller than that of a general hole as described above. For example, it may be necessary to form a hole having a diameter of 40 mm or less or a hole having a diameter of about 32 to 35 mm. Even a hole having such a diameter can be used for photographing the inside of the hole if it is the in-cavity photographing apparatus of the present invention.

The cavity photographing apparatus of the present invention can be used for inspecting various holes such as holes formed horizontally and holes formed vertically in a concrete foundation or the like. In particular, the in-cavity imaging device of the present invention can be effectively used when photographing the inside of a hole formed diagonally with respect to the vertical direction or the horizontal direction. That is, in a structure such as a concrete foundation, which is formed so that its cross-sectional area decreases from the bottom to the top, the gaps between the structural bars are not necessarily formed side by side in the vertical direction. That is, when the position in the vertical direction changes, the gap between the structural bars may be arranged at a position slightly displaced in the horizontal direction. On the other hand, when a hole is formed in a concrete foundation by boring, a hole is formed so as to sew a gap between the structural bars so as not to damage the structural bars. Then, the formed holes are formed diagonally with respect to the vertical direction. Moreover, the diameter of such an inclined hole cannot be made very large. The in-cavity photographing apparatus of the present invention is effectively used as an apparatus for inspecting the inside of a hole having a diameter smaller than that of a normal concrete inspection (for example, a hole having a diameter of 40 mm or less) formed diagonally with respect to the vertical direction. can do.

Further, the purpose of photographing the inside of the hole is not particularly limited. For example, the inside of the hole may be photographed in order to judge the deterioration of the structure in which the hole is formed, or the situation where the repair injection such as groundwater or concrete flows out from the opening of the inner wall surface of the hole is confirmed. In some cases, the inside of the hole is photographed in order to do so. The in-cavity imaging device of the present invention can be effectively used for imaging for such a purpose.

Hereinafter, a case where the inside of a hole formed in a concrete foundation is photographed by the cavity photographing apparatus of the present invention and the presence or absence of cracks in the concrete is inspected will be described as a representative. In the following description, the hole photographed by the cavity photographing apparatus of the present invention is referred to as a cavity h.

(Cavity imaging device 1 of this embodiment)
Next, the structure of the cavity photographing apparatus 1 of the present embodiment will be described with reference to the drawings.

(Cavity imaging device 1 of this embodiment)
As shown in FIG. 1, the in-cavity imaging device 1 of the present embodiment includes an imaging device 2 provided with an imaging unit for photographing the inside of the cavity h, and a control unit 5 connected to the imaging device 2. I have.

As shown in FIG. 2, this photographing device 2 is a device formed in a substantially rod shape, and is a front photographing portion C1 held by a case portion 10 (see FIG. 1), a side photographing portion C2 , and a reflector M. And have.

(Case part 10)
The case portion 10 is formed so that its diameter is slightly smaller than the diameter of the cavity h for photographing the inside. For example, when inserting into a cavity h having a diameter of 40 mm or less or a diameter of about 32 to 35 mm, the case portion 10 has a diameter D2 (see FIG. 4A) of 0 rather than the diameter of the cavity h. It is formed as small as about 5.5 mm to several mm (more preferably about 1 to 2 mm). That is, if the diameter of the cavity h is about 32 to 35 mm, the case portion 10 is formed to have a diameter of about 28 mm to 34.5 mm, preferably about 31 to 34 mm. The difference (that is, clearance) between the diameter D2 of the case portion 10 and the diameter of the cavity h is not limited to the above range, and may be larger or smaller than the above range.

Then, the front photographing unit C1, the side photographing unit C2 , the reflector M, and the codes Ca and Cb described later are cases so as not to come into contact with the inner wall w of the cavity h when the photographing device 2 is inserted into the cavity h. It is attached to the portion 10. That is, the case portion 10 is formed in a shape that can protect the front photographing portion C1 and the like, but the details will be described later.

(Front shooting unit C1)
As shown in FIGS. 2 and 3, the front photographing portion C1 is attached to the case portion 10 so as to be located near the tip portion of the photographing device 2. The front photographing unit C1 is provided with a camera c on the front end surface, and a light source f such as an LED light is provided so as to surround the camera c (see FIG. 4A). The front end surface of the front photographing portion C1 is arranged in the tip opening of the case portion 10 so that the camera c can photograph the front of the photographing device 2. That is, the front photographing portion C1 is attached to the case portion 10 so that the camera c faces the front of the photographing device 2. Moreover, the front photographing unit C1 is arranged so that the optical axis of the camera c and the central axis CL of the photographing device 2 are coaxial or substantially coaxial. The forward photographing unit C1 is connected to the control unit 5 by a cord Ca (see FIG. 1). This code Ca is wired along the axial direction of the photographing device 2 so as not to come out from the side of the photographing device 2, and is pulled out from the rear end of the photographing device 2 (FIGS. 2 and 3). reference). The code Ca is wired at a position where it does not interfere with the side photographing unit C2 or the reflecting mirror M. For example, the cord Ca is wired so as to pass by the side photographing unit C2 and the reflecting mirror M. Further, since it is assumed that groundwater or the like intrudes into the cavity h, when shooting underwater, those having waterproof performance are used for the front photographing unit C1 and the side photographing unit C2 .

( Side photography section C2 )
As shown in FIGS. 2 and 3, the side photographing portion C2 is attached to the case portion 10 so as to be located behind the above-mentioned front photographing portion C1. For example, in FIGS. 2 and 3, the case portion 10 is attached so as to be located behind the middle of the photographing device 2 in the axial direction. Similar to the front photographing unit C1, the side photographing unit C2 is also provided with a camera c on the front end surface, and a light source f such as an LED light is provided so as to surround the camera c (FIG. 4B). reference). The side photographing unit C2 is also arranged so that the camera c can photograph the front and the optical axis thereof and the central axis CL of the photographing apparatus 2 are coaxial or substantially coaxial. This side photographing unit C2 is connected to the control unit 5 by a cord Cb (see FIG. 1). This code Cb is wired along the axial direction of the photographing device 2 and is pulled out from the rear end of the photographing device 2.

(Reflector M)
As shown in FIGS. 1 to 3, a reflector M is provided in front of the side photographing unit C2 . The reflecting mirror M is provided so that its reflecting surface Ma faces the camera c of the side photographing unit C2 . Moreover, in the reflecting mirror M, the center of the reflecting surface Ma is located on the extension line of the central axis CL of the photographing device 2 (that is, the optical axis of the camera c of the side photographing unit C2 ), and the reflecting surface Ma is the photographing device. It is provided so as to be inclined with respect to the central axis CL of 2. For example, the reflecting surface Ma is provided so that the inclination angle θ with respect to the central axis CL of the photographing device 2 is 45 degrees. When the inclination angle θ of the reflecting surface Ma is 45 degrees, the camera c of the side photographing unit C2 can photograph a direction orthogonal to the central axis CL of the photographing device 2 via the reflecting surface Ma. In other words, the image right beside the photographing device 2 at the position of the reflecting surface Ma can be photographed by the camera c of the side photographing unit C2 .

The size of the reflector M is not particularly limited, but it is preferably as large as possible in order to make the area captured by the camera c of the side photographing unit C2 as wide as possible. For example, it is preferable that the reflecting surface Ma of the reflecting mirror M is larger than the range in which the camera c of the side photographing unit C2 can take an image at the position of the reflecting mirror M.

On the other hand, the reflector M may have a size that does not protrude from the case portion 10 in order to prevent interference with the inner wall w of the cavity h when the photographing device 2 is inserted into the cavity h. However, as shown in FIGS. 2 and 3, when the code Ca of the front photographing unit C1 is arranged on the side of the reflecting mirror M, the code Ca of the photographing unit C1 is arranged on the side of the reflecting mirror M. However, the size is preferable so that the code Ca of the photographing unit C1 does not protrude from the outer surface of the case unit 10. Of course, in order to make the reflector M as large as possible, a notch or the like may be provided, and the code Ca of the photographing unit C1 may be arranged in the notch or the like.

(Control unit 5)
The control unit 5 is connected to the front imaging unit C1 and the side imaging unit C2 by the cords Ca and Cb. The control unit 5 has a function of supplying electric power to the camera c and the light source f of the front shooting unit C1 and the side shooting unit C2 , and acquiring and storing an image taken by the camera c. Have. For example, as the control unit 5, a computer or the like in which a control program for controlling the operation of the front photographing unit C1 and the side photographing unit C2 is installed can be used. However, the control unit 5 can be used with any device as long as it has the above functions.

The control unit 5 also controls the timing at which the camera c of the front shooting unit C1 and the camera c of the side shooting unit C2 shoot an image. For example, the control unit 5 can control the camera c of the front shooting unit C1 and the camera c of the side shooting unit C2 to separately shoot an image (that is, a front image and a side image). That is, regardless of the shooting status of the front shooting unit C1, the side shooting unit C2 may be controlled to shoot the side of the shooting device 2. In other words, the front photographing unit C1 and the side photographing unit C2 may control the operation of the camera c so as to capture images independently of each other. Of course, the operation of the camera c may be controlled so that the timing at which the front photographing unit C1 captures an image and the timing at which the side photographing unit C2 captures an image are linked.

Further, the control unit 5 has a display unit d capable of displaying an image taken by the camera c, and a function (display) capable of reproducing and displaying a real-time image or an image stored in the memory of the control unit 5 on the display unit d. It is desirable to have a playback function). In particular, when inspecting the cavity h, it is desirable to have a display unit d and a display reproduction function (particularly a real-time reproduction function). In this case, the rough state of the inner wall w of the cavity h can be grasped by displaying the image taken by the camera c of the front photographing unit C1 on the display unit d. Then, after roughly grasping the state of the inner wall w of the cavity h, the inner wall w of the cavity h can be photographed by the camera c of the side photographing unit C2 . Then, the state of the inner wall w of the cavity h can be confirmed in detail by displaying the image taken by the camera c of the side photographing unit C2 on the display unit d. Further, if the image captured by the camera c of the front imaging unit C1 is displayed on the display unit d while the imaging device 2 is inserted into the cavity h, an obstacle in front (a protrusion of the inner wall w of the cavity h ) is displayed. You can grasp objects and deposits such as water and stones). Then, it is possible to prevent the photographing device 2 from being damaged due to a collision with an obstacle or the like, or the photographing device 2 being caught by an obstacle in the hole and being unable to be removed by the photographing device 2.

(Holding shaft 3)
Further, the photographing device 2 is configured so that the holding shaft 3 can be connected to the rear end of the case portion 10. Specifically, the holding shaft 3 can be connected so that its axial direction is parallel to the central axis CL of the case portion 10. For example, if the nut member 10n is provided in the case portion 10 and a male screw is formed at the tip of the holding shaft 3, the holding shaft 3 and the case portion 10 can be connected (FIG. 5).

Further, the holding shaft 3 may have a structure capable of coaxially connecting a plurality of the holding shafts 3. Specifically, if a male screw is formed at the rear end of the holding shaft 3, a nut member having a female screw formed at both ends of the rear end of one holding shaft 3 and the tip of the other holding shaft 3. It can be connected by (connecting nut). Then, the holding shaft 3 can be extended. For example, even a holding shaft 3 having a length of about 1 m can be extended to a desired length by connecting the holding shafts 3. Then, if a plurality of holding shafts 3 are used, the photographing device 2 can be inserted into a deep cavity h formed in the concrete foundation B having a length of 5 m or more. Moreover, since one holding shaft 3 can be shortened, it is possible to prevent the holding shaft 3 from being deteriorated in handleability and portability when the holding shaft 3 is transported or stored.

The holding shaft 3 may have a stretchable structure in order to prevent deterioration of portability and handleability and to allow the holding shaft 3 to have a certain length. For example, a holding shaft 3 having a structure in which a plurality of tubular shaft members are connected in a telescopic manner may be used.

Further, the holding shaft 3 does not necessarily have to be provided. For example, if the cavity h is formed vertically, the photographing device 2 can be moved in the cavity h even if the photographing device 2 is hung with a string or a wire. Further, the frame portion 10 of the photographing device 2 may be gripped by a shaft having a clamp or the like to move the photographing device 2 in the cavity h .

(Inspection method of concrete foundation using the cavity imaging device 1 of the present embodiment)
Since the cavity imaging device 1 of the present embodiment has the above configuration, it is possible to photograph the inside of the cavity h formed in the concrete foundation and inspect the concrete foundation.

First, as shown in FIG. 7, an opening is provided on the surface of the concrete foundation B to be inspected, and a cavity h is formed from the opening toward the inside. Specifically, the tubular member is made to penetrate into the concrete foundation B by a method such as turning the tubular member having a blade at the tip from the state where it is in contact with the surface of the concrete foundation B. Then, when the tubular member penetrates to a certain depth, the tubular member is pulled out from the concrete foundation B. Then, a cavity h having an opening on the surface and extending inward from the opening can be formed in the concrete foundation B. The inside of the tubular member contains a concrete foundation B that was present in the portion of the cavity h (boring core), and this boring core can also be used for inspection of the concrete foundation B.

If the depth of the cavity h has not reached the depth to be inspected, a longer tubular member, a connected tubular member, or the like is inserted into the formed cavity h, and the above is performed. The same work as in the above is performed to form a deeper cavity h.

Then, when the cavity h extending almost straight to the originally planned depth is formed, imaging by the cavity photographing apparatus 1 is performed by the following procedure. The cavity h extending substantially straight means a cavity h having a linearity to the extent that the in-cavity photographing apparatus 1 of the present embodiment can move. For example, a cavity h whose central axis is coaxial over the entire length, a cavity h having a portion where the center of the cross section of the cavity h is slightly deviated depending on the position in the length direction, and a cavity h having a slightly curved portion. The cavity h, which extends almost straight, contains all of the above.

First, the codes Ca and Cb of the front photographing unit C1 and the side photographing unit C2 of the photographing device 2 are connected to the control unit 5.
Then, the holding shaft 3 is connected to the photographing device 2. At this time, if necessary, a plurality of holding shafts 3 are connected.

When the holding shaft 3 is connected to the photographing device 2, the holding shaft 3 is held and the photographing device 2 is inserted into the cavity h from the tip thereof (see FIG. 7). At this time, since the diameter of the case portion 10 is slightly smaller than the diameter of the cavity h, the photographing device 2 smoothly moves in the cavity h without rattling in the cavity h.

If the front photographing unit C1 of the photographing device 2 takes an image while advancing the photographing device 2 in the cavity h and the display unit d of the control unit 5 displays the image of the front photographing unit C1, the inside of the cavity h. While checking the situation, the image pickup device 2 can be penetrated into the cavity h. Then, even if an aggregate or the like is exposed on the inner wall w of the cavity h or debris generated when forming the cavity h is present in the cavity h, the existence of these objects can be grasped in advance. .. Therefore, it is possible to prevent the photographing device 2 from coming into contact with these objects.

On the other hand, in the inspection of the concrete foundation B or the like, it is inspected whether or not there are cracks or the like on the inner wall w of the cavity h. Even if it can be grasped, it may not be possible to fully grasp the detailed situation of the crack. For example, if the inner diameter of the cavity h is 40 mm or less, the camera c of the front photographing unit C1 that can be used can only be used with an aperture of about 10 mm at most. Since a camera having such an aperture has a small angle of view, it is possible to take an image of the inner wall w of the cavity h, but it is difficult to take a clear image of the inner wall w. For example, if the width of the crack is about 0.2 mm or less, the existence of the crack can be confirmed in the image of the camera c of the front photographing unit C1, but the state of the crack cannot be grasped.

However, the photographing device 2 includes a side photographing unit C2 , and the side surface can be photographed by the camera c of the side photographing unit C2 via the reflecting surface Ma of the reflecting mirror M. Then, the camera c of the side photographing unit C2 can photograph the inner wall w of the cavity h in a state substantially similar to the case where the inner wall w of the cavity h is in front of the camera c. Therefore, even if the aperture of the camera c of the side photographing unit C2 is about 10 mm, a clear image of the inner wall w of the cavity h can be taken (see FIG. 8B). In other words, even if the cavity h has a diameter of 40 mm or less, the photographing device 2 can capture a clear image of the inner wall w of the cavity h.

Therefore, when the existence of the crack is confirmed by the image of the camera c of the front photographing unit C1, the photographing device 2 is moved so that the photographing area of the camera c of the side photographing unit C2 is located at that position. Then, if the image of the inner wall w of the cavity h is taken by the camera c of the side photographing unit C2 , the state of the crack can be grasped in detail.

Moreover, after the crack in the inner wall w of the cavity h is photographed by the camera c of the front photographing unit C1, the crack is photographed by the camera c of the side photographing unit C2 simply by moving the photographing apparatus 2 along the cavity h. can. Then, since the time from the crack discovery to the detailed photography can be shortened, the speed of inspecting the inside of the cavity h can be increased. If the speed of inspecting the inside of the cavity h is increased, there is an advantage that the entire inspection time of the concrete foundation B can be shortened.

Then, if the holding shaft 3 is connected, the photographing device 2 can be inserted even if the cavity h is deep, even to the bottom of the cavity h. That is, by inserting the photographing device 2 into the cavity h while connecting the plurality of holding shafts 3, the cavity h can be inspected by the photographing device 2 even if the cavity h is deep (for example, about 10 m). ..

When the imaging of the entire cavity h is completed, the imaging device 2 is taken out from the cavity h, and then the cavity h is filled with concrete or the like, so that the inspection of the concrete foundation B is completed.

As described above, if the concrete foundation B is inspected using the in-cavity photographing apparatus 1 of the present embodiment, the concrete foundation B can be inspected to a desired depth only by forming the cavity h from the surface of the concrete foundation B. Is possible. Then, the inspection of the concrete foundation B can be carried out in a shorter time than the conventional inspection, and restrictions such as the inspection target and the inspection time can be reduced.

Conventionally, when inspecting a concrete foundation B such as a steel tower, the ground around the concrete foundation B is dug down. Then, the concrete foundation B is exposed to the depth to be inspected, and the inspection is carried out from the exposed portion. In this case, a very large-scale construction is required to expose the concrete foundation B. In particular, in the case of the concrete foundation B installed in the river, the surrounding water must be dammed to expose the concrete foundation B, which requires a long period of time and a large amount of work and cost.
In addition, since long-term work is required, inspections cannot be carried out during periods of unstable climate (rainy season, typhoon season, snowfall season, etc.), and inspections are conducted during periods when the weather is relatively stable. There is also the limitation of being limited.
Moreover, since the concrete foundation B originally buried in the ground is exposed, the concrete foundation B cannot exhibit the predetermined durability (ability to support the structure) during the inspection period. In the case of a structure having a plurality of concrete foundations B, it is desirable to inspect all the concrete foundations B at the same time. However, due to the deterioration of the durability of the concrete foundation B, the lengthening of the working time, and the problem of cost, it is currently impossible to inspect all the concrete foundations B at the same time, and it is unavoidable that some of them are selected. Inspecting the concrete foundation B of.
Since the durability of the concrete foundation B is reduced during the inspection work, there is a risk that the structure will collapse if an earthquake or the like occurs during the inspection work. In particular, there is a great risk for the worker because the worker enters the part dug down and carries out the inspection.

On the other hand, if the concrete foundation B is inspected using the in-cavity photographing apparatus 1 of the present embodiment, the concrete foundation B can be inspected in the installed state. That is, if a cavity h is formed from the exposed surface (for example, the upper surface) of the concrete foundation B toward the inside of the concrete foundation B, the inspection can be performed only by inserting the photographing apparatus 2 into the cavity h. .. If the diameter of the cavity h is sufficiently smaller than that of the concrete foundation B, the formation of the cavity h has almost no effect on the durability of the concrete foundation B. Therefore, by using the in-cavity photographing apparatus 1 of the present embodiment, the inspection of the concrete foundation B can be safely carried out. Moreover, the work from the formation of the cavity h to the burying of the cavity h can be completed in a very short time (about 3 days at the longest). Then, the inspection can be carried out at a desired time without being restricted by the climate or the like, and even for a structure having a plurality of concrete foundations B, all the concrete foundations B can be inspected at almost the same time. Then, in the inspection using the in-cavity photographing apparatus 1 of the present embodiment, the inspection is possible as long as the concrete foundation B has an exposed surface. Then, the inspection can be easily carried out on the concrete foundation B (for example, the concrete foundation B installed in the river) in any place.

In order to inspect the inner surface of the cavity h formed in the concrete foundation B or the like by the in-cavity photographing device 1 of the present embodiment, it is important to know which depth is inspected (photographed). Therefore, if a tape measure or the like is provided along the holding shaft 3, it is possible to grasp how deep the photographing device 2 is arranged. Of course, a scale may be provided on the holding shaft 3 itself to grasp the depth at which the photographing device 2 is arranged, or the photographing device 2 is arranged by a non-contact type distance measuring device such as a laser range finder. You may try to grasp the depth of the laser.

(Case part 10)
As described above, the case portion 10 has a function of protecting the front photographing portion C1 and the like, and arranges the central axes of the front photographing portion C1 and the side photographing portion C2 so that the central axes of the cavity h are coaxial or substantially coaxial. It suffices to have a function to perform and a structure that exerts the function, and the shape thereof is not particularly limited. For example, a hollow cylindrical member may be used as the case portion, and the front photographing portion C1, the side photographing portion C2 , the reflector M, the cords Ca, Cb, and the like may be housed therein. In this case, an opening is provided at the tip of the case portion for the camera c of the front photographing unit C1 to photograph the front, and the camera c of the side photographing unit C2 photographs the side surface of the case portion via the reflector M. A window (observation window) will be provided. Then, the front imaging unit C1 and the side imaging unit C2 can photograph the front and the side, and the case unit 10 can protect the front imaging unit C1 and the like.

Further, when there is a possibility that the inner wall w has irregularities or the inner wall w may be peeled off, it is desirable that the case portion 10 has the following structure. For example, if the inner wall w has irregularities, the case portion 10 may be caught by the irregularities, and if the inner wall w is easily peeled off, the peeled object may enter the case portion 10 and cannot be discharged. There is sex. These problems are such that the diameter of the cavity h becomes smaller and the gap between the two becomes smaller when the case portion 10 is inserted into the cavity h, and the case portion 10 itself becomes smaller (in other words, the smaller the diameter). become. However, if the case portion 10 has the following structure, even if the inner wall w has irregularities, the influence of the irregularities can be reduced when the photographing device 2 is moved. Further, even if an object having the inner wall w peeled off enters the case portion 10, the invaded object can be easily and quickly discharged to the outside of the case portion 10.

As shown in FIGS. 2 and 3, the case portion 10 has an annular plate group 11 having a plurality of annular plates 11a (4 each in FIGS. 2 and 3) and a circular having an annular plate 12a. The ring plate group 12 and the like are provided. The annulus plate group 11 holds the above-mentioned front imaging unit C1, and the annulus plate group 12 holds the side imaging unit C2 .

The annular plate group 11 is arranged at substantially equal intervals so that the centers of the plurality of annular plates 11a are located on the same axis (the central axis of the annular plate group 11). That is, the plurality of annular plates 11a are arranged so that the center of the hole n is located coaxially (the central axis of the annular plate group 11). Then, the above-mentioned anterior photographing portion C1 and the cord Ca are inserted and fixed in the holes n (see FIG. 4A) of the plurality of annular plates 11a.

The ring plate group 11 includes four frame plates 11b. The four frame plates 11b connect a plurality of annular plates 11a so as to maintain the above state. The four frame plates 11b are plate-shaped members having the same shape. The four frame plates 11b are radial with respect to the central axis of the annular plate group 11 when the case portion 10 is viewed from the tip side (see FIG. 4A), and are adjacent to each other in the circumferential direction. It is arranged so that a gap is formed between the frame plates 11b. Moreover, the four frame plates 11b are in a state where the outer edge e protrudes from the outer peripheral edge of the annular plate 11a, and the distance from the outer edge e to the central axis of the annular plate group 11 is the same distance (or). It is arranged so as to be (almost the same distance). The almost same distance here means that a difference of about several mm is allowed.

Similar to the annular plate group 11, the annular plate group 12 also has the centers of the plurality of annular plates 12a (4 in FIGS. 2 and 3) located coaxially (the central axis of the annular plate group 12). They are arranged at almost equal intervals so as to do so. That is, the holes n of the plurality of annular plates 12a are also arranged so that their centers are located on the same axis (the central axis of the annular plate group 12). Then, the above-mentioned side photographing portion C2 and the cord Cb are inserted and fixed in the holes n of the plurality of annular plates 12a.

The ring plate group 12 includes four frame plates 12b. The four frame plates 12b connect a plurality of annular plates 12a so as to maintain the above state. The four frame plates 12b are plate-shaped members having the same shape. Similar to the four frame plates 11b of the annular plate group 11, the four frame plates 12b also radiate with respect to the central axis of the annular plate group 12 and are adjacent to each other in the circumferential direction. It is arranged so that there is a gap between them. Moreover, the four frame plates 12b are in a state where the outer edge e protrudes from the outer peripheral edge of the annular plate 12a, and the distance from the outer edge e to the central axis of the annular plate group 12 is the same distance (or). It is arranged so as to be (almost the same distance). The almost same distance here means that a difference of about several mm is allowed.

(A pair of connecting frames 13, 14)
As shown in FIGS. 1 to 3, the case portion 10 has a pair of connecting frames 13 and 14. The pair of connecting frames 13 and 14 are long plate-shaped members having substantially the same shape, and have substantially the same structure as the above-mentioned frame plates 11b and 12b except for the difference in length. (See FIG. 4).

In the case portion 10, the annular plate group 11 and the annular plate group 12 are connected by a pair of connecting frames 13 and 14. Specifically, the annular plate group 11 and the annular plate group 12 are paired with each other so that the central axis of the annular plate group 11 and the central axis of the annular plate group 12 are coaxial with each other. Are linked by. Moreover, the ring plate group 11 and the ring plate group 12 are paired so as to create a space in which the reflector M is arranged between the rear end of the ring plate group 11 and the tip end of the ring plate group 12. They are connected by connecting frames 13 and 14. Then, in the space where the reflecting mirror M is arranged, a stay 15 for fixing the reflecting mirror M to the pair of connecting frames 13 and 14 is provided.

The space between the rear end of the ring plate group 11 and the tip of the ring plate group 12 and between the pair of connecting frames 13 and 14 in the circumferential direction corresponds to the observation window in the claims. do.

As described above, if the case portion 10 is formed by the annular plate group 11, the annular plate group 12, and the pair of connecting frames 13, 14, the pair of connecting frames 13, 14 and the frame plates 11b, 12b can be formed. , Can function as a guide when the photographing apparatus 2 moves along the inner wall w of the cavity h. Then, the photographing device 2 can be smoothly moved in the cavity h.

Further, a gap is formed between the pair of connecting frames 13, 14, the frame plates 11b, 12b, and the annular plates 11a, 12a. Then, even if the inner wall w has unevenness, it is difficult to get caught in the unevenness, and even if it gets caught, the catching can be easily eliminated. Further, even if an object or the like from which the inner wall w is peeled off enters the case portion 10 through the gap of the case portion 10, there is an advantage that the object or the like can be easily removed from the other gap or the like.

It is desirable that the four frame plates 11b and the pair of connecting frames 13 and 14 have an inclined surface on the outer surface of the end portion on the distal end side thereof. Specifically, it is desirable that the inclined surface is inclined so that the distance from the central axis of the case portion 10 becomes shorter toward the tip end. If the four frame plates 11b and the pair of connecting frames 13 and 14 have an inclined surface, it is easy to insert the photographing device 2 into the cavity h, and when the photographing device 2 is advanced in the cavity h. The advantage is that the resistance is reduced.

Similarly, it is desirable that the four frame plates 12b and the pair of connecting frames 13 and 14 have an inclined surface on the outer surface of the end portion on the rear end side. Specifically, it is desirable that the inclined surface is inclined so that the distance from the central axis of the case portion 10 becomes shorter toward the rear end. If the four frame plates 12b and the pair of connecting frames 13 and 14 have an inclined surface, there is an advantage that the resistance is reduced when the photographing apparatus 2 is retracted in the cavity h.

The gap formed between the pair of connecting frames 13, 14 described above, the gap formed between the pair of connecting frames 13, 14, the frame plates 11b, 12b, and the annular plates 11a, 12a, the annular plate 11a, The hole n of 12a corresponds to the internal space as defined in the claims.
Further, the pair of connecting frames 13, 14 and the frame plates 11b, 12b correspond to a plurality of frame members in the claims, and the annular plates 11a, 12a correspond to the connecting members in the claims.

In addition, the code Ca of the anterior photographing portion C1 is arranged in the annular plate group 12. At this time, the annular plate 12a may be provided with a notch g through which the code Ca of the front photographing portion C1 is passed so that the cord Ca of the front photographing portion C1 does not protrude from the outer surface of the case portion 10 (FIG. 4 (FIG. 4). B) See). Of course, the annular plate 12a may be provided with a through hole through which the cord Ca of the front photographing portion C1 is inserted.

Further, since the outer peripheral edge of the annular plate 12a is recessed inward from the outer edge e of the four frame plates 12b and the pair of connecting frames 13 and 14, the recessed portion (for example, FIG. 4B). The code Ca of the front photographing unit C1 may be wired to the portion of x).

(Reflector M)
The tilt angle θ of the reflecting surface Ma of the reflecting mirror M is not particularly limited. When inspecting the inner surface of the cavity h described above using the image taken by the camera c of the side photographing unit C2 , it is desirable to adjust the inclination angle θ of the reflecting surface Ma to 45 degrees.

(Focus adjustment mechanism of camera c of side shooting unit C2 )
In order to clearly photograph the inner surface of the cavity h by the camera c of the side photographing unit C2, it is necessary to adjust the focal length of the camera c of the side photographing unit C2 according to the diameter of the cavity h. That is, it is necessary to adjust the distance between the camera c of the side photographing unit C2 and the reflecting surface Ma so that the position of the focal point is substantially on the inner surface of the cavity h. For example, if the annular plate group 12 is provided with a fixing / releasing mechanism that allows the camera c of the side photographing unit C2 to move and be fixed along the axial direction of the case unit 10, the camera c of the side photographing unit C2 can be used. The distance from the reflecting surface Ma can be adjusted.

A known mechanism can be adopted as the fixing / releasing mechanism.
For example, the annular plate group 12 is provided with a ring-shaped clamp that can hold and open the camera c of the side photographing portion C2 . Then, if the clamp is tightened, the camera c of the side photographing portion C2 can be fixed to the annular plate group 12, and if the clamp is loosened, the camera c of the side photographing portion C2 is moved along the axial direction of the case portion 10. be able to.

Further, the annular plate group 12 is provided with a plurality of screws that advance and retreat in the radial direction thereof. Specifically, a plurality of screws are provided so as to be rotationally symmetric around the central axis of the annular plate group 12. Then, if a plurality of screws are advanced toward the central axis of the annular plate group 12 and the tip thereof is brought into contact with the side surface of the camera c of the lateral photographing unit C2 , the camera is driven by the tips of the plurality of screws. c can be retained. On the other hand, if the plurality of screws are retracted from the central axis of the annular plate group 12, the camera c of the lateral photographing unit C2 can be moved along the axial direction of the annular plate group 12.

Since the camera c of the side photographing portion C2 is inserted into the holes n of the four annular plates 12a, when the camera c of the side photographing portion C2 is moved along the axial direction of the case portion 10, the camera c is moved. The hole n of the annular plate 12a can function as a guide. Then, the optical axis of the camera c of the side photographing unit C2 and the central axis of the case unit 10 can be moved in a substantially coaxial (or substantially parallel) state. Therefore, even if the distance between the camera c of the side photographing unit C2 and the reflecting surface Ma is adjusted, it is possible to suppress the change in the photographing position (the axial position of the cavity h or the circumferential position). .. That is, if the inclination angle θ of the reflecting surface Ma is 45 degrees, even if the distance between the camera c of the side photographing unit C2 and the reflecting surface Ma is adjusted, the photographing device at the position of the reflecting surface Ma. The image right next to 2 can be measured by the camera c of the side photographing unit C2 .

Further, the fixing / releasing mechanism is not limited to the one that holds the side photographing portion C2 so as to be movable and fixed, and the stay 15 to which the reflecting mirror M is attached can be moved and fixed along the axial direction of the case portion 10. But it may be. For example, the stay 15 to which the reflector M is fixed can be moved along the pair of connecting frames 13 and 14 (that is, along the axial direction of the case portion 10) and can be fixed at a predetermined position. On the other hand, the side photographing portion C2 is fixed so as not to move along the axial direction of the case portion 10. Then, by moving the stay 15 to which the reflecting mirror M is fixed, the distance between the camera c of the side photographing unit C2 and the reflecting surface Ma can be adjusted.

(Another example of inspection by the in-cavity imaging device 1 of the present embodiment)
In the cavity h to be inspected by the in-cavity photographing apparatus 1 of the present embodiment, groundwater or the like may enter through cracks in the concrete foundation or the like. In this case, groundwater or the like is pumped up and drained, and then the photographing device 2 is placed in the cavity h for inspection.

However, when groundwater enters, the inner wall w of the cavity h becomes wet. When the inner wall w of the cavity h in a wet state is photographed, the light from the light source f of the camera c is reflected by the moisture of the inner wall w of the cavity h. Then, since the image becomes difficult to see due to the reflected light, even if a crack or the like exists on the inner wall w of the cavity h, it becomes difficult to find the crack from the image (see FIG. 10A).

Therefore, when the inner wall w of the cavity h is in a wet state, it is desirable to dry the inner wall w of the cavity h to some extent and then put the photographing apparatus 2 in the cavity h for inspection. For example, as shown in FIG. 9A, after draining groundwater or the like in the cavity h, the air supply tube AP is inserted into the cavity h. Then, one end of the air supply tube AP is arranged near the inner bottom surface of the cavity h. After that, a gas such as air is supplied to the other end of the air supply tube AP by a blower AB or the like. Then, the gas is blown into the cavity h from one end of the air supply tube AP, moves along the inner wall w of the cavity h, and is discharged to the outside through the opening of the cavity h. If the gas is blown into the cavity h in this way, the inner wall w of the cavity h can be dried by the flow of the gas. Then, it is possible to prevent the light from the light source f of the camera c from being reflected by the moisture of the inner wall w of the cavity h to form a glaring image, so that it becomes easier to find cracks in the inner wall w of the cavity h (FIG. 10 (FIG. 10). B) See).

The gas blown into the cavity h through the air supply tube AP is not particularly limited. Those having a high effect of drying a liquid such as water adhering to the inner wall w of the cavity h are preferable. For example, if a commercially available heat gun is used to generate hot air or hot air of about 200 to 300 degrees and the hot air or hot air is blown into the cavity h through the air supply tube AP, water adhering to the inner wall w of the cavity h is generated. It is possible to enhance the effect of drying liquids such as.

(Still another example of inspection by the in-cavity imaging device 1 of the present embodiment)
Further, when it is difficult to drain the inside of the cavity h, such as when groundwater or the like continues to enter the cavity h to be inspected by the in-cavity photographing apparatus 1 of the present embodiment, the inspection may be performed with the groundwater or the like still contained.

As shown in FIG. 11A, when the water that has entered the cavity h due to a crack or the like is turbid, it is difficult to inspect it as it is. However, if the water that has entered the cavity h is replaced with clean water, it is possible to observe the inner wall w of the cavity h through the water (FIG. 11B). That is, as shown in FIG. 6, if the liquid supply device 20 is provided in the cavity imaging device 1 of the present embodiment, the water that has entered the cavity h can be replaced with clean water, so that the inner wall w of the cavity h can be passed through. Can be observed.

For example, as shown in FIG. 6, the tip end portion of the liquid feeding tube 21 of the liquid supply device 20 is attached to the rear portion of the case portion 10 of the photographing device 2. For example, a rubber hose or the like can be used for the liquid feeding pipe 21, but the liquid feeding pipe 21 is not particularly limited.

Then, a liquid supply unit 22 having a liquid feeding function such as a pump is connected to the base end of the liquid feeding pipe 21. The liquid supply unit 22 has a function of pressurizing the liquid and supplying it to the liquid supply pipe 21.

When the liquid supply device 20 is provided, as shown in FIG. 9B, the photographing device 2 is inserted into the cavity h in which groundwater or the like is still contained. In this state, if clean water (water with less turbidity, for example, tap water or the like) is supplied from the liquid supply unit 22 through the liquid feed pipe 21 into the cavity h, the turbid groundwater in the cavity h is replaced with clean water. Then, even if water is present in the cavity h, the inner wall w of the cavity h can be photographed. Moreover, since the light from the light source f can be suppressed from being reflected by the inner wall w of the cavity h, the influence of the reflected light can be reduced and the captured image can be made clear.

The inner wall w of the cavity h may be photographed while supplying the liquid from the liquid supply device 20 , but the liquid is supplied after the transparency of the liquid in the cavity h does not interfere with the imaging. You may stop and shoot.

Further, when the liquid is supplied into the cavity h, the liquid may overflow from the opening of the cavity h, or the liquid in the cavity h may be pumped out so that the liquid does not overflow from the opening of the cavity h. You may do it.

Liquid supply and stop may be repeated during shooting. For example, the captured image may be checked, and the liquid may be supplied when the transparency decreases, and the supply of the liquid may be stopped repeatedly when the imaging is not hindered. In this case, if the control unit 5 is provided with a function of controlling the operation of the liquid supply unit 22 and a function of determining the transparency of the liquid based on the captured image, the liquid is supplied by the liquid supply device 20 based on the captured image. It is also possible to have the control unit 5 control the stop.

Further, when this method is adopted, since the photographing apparatus 2 is immersed in the liquid, a waterproof camera c is used for the camera c of the front photographing unit C1 and the camera c of the side photographing unit C2 . In particular, in order to prevent damage to the camera c due to suspended matter such as dust contained in groundwater, it is desirable to use the camera c having dustproof performance. For example, it is desirable to use a camera c having a grade of IP57 or higher, preferably IP68 or higher, which indicates dustproof and waterproof performance.

Further, since the friction between the inner wall w of the cavity h and the photographing device 2 can be reduced by the presence of the liquid in the cavity h, the resistance when the photographing device 2 in the cavity h moves can be reduced.

The cavity photographing apparatus of the present invention is suitable as an apparatus for inspecting the condition inside a cavity formed in a building such as a concrete foundation, a pier, or an outer wall.

1 Cavity imaging device 2 Imaging device 3 Holding shaft 5 Control unit 10 Case unit 11a Annulus plate 11b Frame plate 12a Annulus plate 12b Frame plate 13 Connecting frame
14 connecting frames
15 stays
20 Liquid supply device
21 Liquid supply tube 22 Liquid supply unit C1 Front imaging unit C2 Side imaging unit
M Reflector Ma Reflective surface h Cavity w Inner wall AP Air blower AB Blower

Claims (11)

A device that is inserted into a cavity and photographs the inside of the cavity.
A case portion extending in the axial direction and formed so that the maximum diameter of the cross section is substantially the same as the diameter of the cavity .
A front photographing unit for photographing the front of the tip of the case portion provided at the tip portion of the case portion, and a front photographing portion.
It is provided with a side photographing unit for photographing the inner wall of the cavity, which is provided behind the front photographing unit.
The side photographing unit and the front photographing unit
It is possible to take images separately for each ,
The case part
Two annulus plate groups holding the front photographing portion and the side photographing portion, respectively, and
It has a plurality of plate-shaped connecting frames for connecting the two annular plate groups so that the central axes of the two annular plate groups are coaxial.
The ring plate group is
Multiple annular plates that are plate-shaped and annular,
A plurality of plate-shaped frame plates connecting the plurality of annular plates at intervals along the central axis direction so that the center thereof is located on the central axis of the annular plate group. I have
The plurality of frame plates are
Arranged so that its longitudinal direction is parallel to the central axis of the annular plate group and radially with respect to the central axis of the annular plate group when viewed from the central axis direction of the annular plate group. And arranged so that the outer edge protrudes from the outer edge of the plurality of annular plates and the distance from the outer edge to the central axis of the annular plate group is the same. Has been
The plurality of connecting frames are
Arranged so that its longitudinal direction is parallel to the central axis of the annular plate group and radially with respect to the central axis of the annular plate group when viewed from the central axis direction of the annular plate group. And the outer edge protrudes from the outer edge of the plurality of annular plates, and the distance from the outer edge to the central axis of the annular plate group is outside the plurality of frame plates. It is arranged so as to be the same distance as the distance from the edge to the central axis of the annular plate group.
The front photographing unit and the side photographing unit
Each of the two ring plates is arranged in the internal space surrounded by the plurality of frame plates.
An intracavitary imaging device characterized by this. The case part
The maximum diameter of the cross section is formed so as to be substantially the same as the diameter of the cavity.
The side photography unit
A camera arranged so that the optical axis is substantially coaxial with the central axis of the case portion ,
It comprises a reflector that is located on the front side of the camera and has a reflective surface that intersects the optical axis of the camera.
An observation window is provided to communicate between the space inside the case and the space outside the case .
The observation window is
The in-cavity photographing apparatus according to claim 1 , wherein the camera is provided at a position where the inner wall of the cavity can be photographed by utilizing the reflection of the reflecting surface of the reflecting mirror. The in-cavity photographing apparatus according to claim 1 or 2 , wherein the liquid supply device for supplying a liquid into the cavity is provided. The liquid supply device
A liquid feed tube with one end arranged in the case,
The cavity photographing apparatus according to claim 3 , further comprising a liquid supply unit for supplying a liquid from the other end of the liquid feeding tube. It is a device that photographs the inside of a cavity with a diameter of 32 to 40 mm formed on a concrete foundation, and is formed so that the outer diameter is 0.5 to 4 mm smaller than the diameter of the cavity.
The in-cavity photographing apparatus according to any one of claims 1 to 4 . The concrete foundation is formed so that the cross-sectional area decreases from the bottom to the top.
The in-cavity photographing apparatus according to claim 5, wherein the cavity is a hole that is oblique with respect to the vertical direction. Forming holes from the surface of the concrete foundation,
The in-cavity photographing apparatus according to claim 1 or 2 is inserted through the opening of a hole formed on the surface of the concrete foundation.
A method for inspecting a concrete foundation, which comprises moving an intracavity imaging device along a hole to photograph the inner surface of the hole. The concrete foundation is formed so that the cross-sectional area decreases from the bottom to the top.
The method for inspecting a concrete foundation according to claim 7 , wherein a hole having a diameter of 32 to 40 mm is formed in the concrete foundation diagonally with respect to the vertical direction. The inspection of the concrete foundation according to claim 7 or 8 , wherein a gas is blown into the hole to dry the inner wall of the hole, and then the in-cavity photographing apparatus according to claim 1 or 2 is inserted into the hole. Method. The method for inspecting a concrete foundation according to claim 7, 8 or 9 , wherein an air supply tube is inserted into the hole so that one end is located near the inner bottom surface of the hole, and gas is supplied from the other end of the air supply tube. .. The concrete foundation according to claim 7, 8, 9 or 10 , wherein the liquid is supplied into the hole with the in-cavity photographing apparatus according to any one of claims 1 to 5 inserted in the hole. Inspection methods.

Images