JP2019131982A - Cavity-inside imaging device and concrete foundation inspection method - Google Patents

Abstract

To provide a cavity-inside imaging device and a concrete foundation inspection method capable of inspecting a cavity- inside quickly and in a short time.SOLUTION: A device that is inserted into a cavity h and images the interior of the cavity h, includes a case portion extending in the axial direction, a front imaging portion C1 that images the front from the tip end of the case portion provided at the tip end of the case portion, and a front imaging portion C2 provided behind the imaging portion C1, and also each of the front imaging portion C2 and the front imaging portion C1 can capture image individually capture images. Since the forward image and the sideward image of the case portion can be simultaneously imaged, the state of the inner wall w of the cavity h can be imaged while checking the forward situation of the case portion. Therefore, in the situation where an obstacle or the like exists in the cavity h, even if the device moves the inside of the cavity while imaging the state of the inner wall w of the cavity h, it is possible to prevent the device from being damaged by colliding with an obstacle or the like.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an in-cavity imaging apparatus and a concrete foundation inspection method. More particularly, the present invention relates to an in-cavity imaging apparatus for inspecting a situation in a cavity formed in a building such as a concrete foundation, a bridge pier, or an outer wall, and a concrete foundation inspection method.

  A boring survey may be conducted as a method of confirming the condition of the ground and concrete foundations (hereinafter referred to as the ground). In the boring survey, soil from a surface such as the ground to a certain depth is taken into a pipe and the sample taken (boring core) is investigated. On the other hand, since the boring core has been removed from the actual ground or the like, the sample has no pressure applied to the actual ground. For this reason, if the diameter of the boring core is large to some extent, there is a possibility that the presence or absence of cracks in the ground or the like and the position of the cracks can be grasped 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, when it is removed from the ground or the like, the boring core may not be able to maintain its shape. Then, even if it can grasp | ascertain the soil quality etc. in each position of a sample, the presence or absence of the crack in the ground etc. and the position of a crack cannot be grasped | ascertained.

  As a method of reliably grasping defects such as cracks in the ground or the like, there is a method of taking a picture of the inner wall surface of a hole by inserting a camera into the hole formed by boring. As an apparatus used in such a method, that is, an apparatus for photographing the inside by inserting into a hole formed in the ground or the like, an apparatus described in Patent Document 1 has been developed. This device includes a camera storage unit including a camera and a reflecting mirror, and a cylindrical head unit having a window on a side surface, and the device is inserted into the hole while the camera storage unit is stored in the head unit. Thus, the wall surface of the hole is photographed. Specifically, in this apparatus, when the camera housing portion is inserted into the hole in a state where the camera housing portion is placed in the head portion, the optical axis of the camera is arranged to be parallel to the axial direction of the hole. The reflecting mirror is attached to the camera housing portion so as to be disposed at a position corresponding to the window of the head portion when the camera housing portion is inserted into 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. For this reason, in the apparatus of patent document 1, the wall surface of the hole reflected on the reflecting surface of the reflecting mirror through the window of the head portion can be photographed by the camera.

  However, in the apparatus of Patent Document 1, since only the wall surface of the hole located on the side of the apparatus can be observed, if an obstacle or the like is present in front of the apparatus, the obstacle is not touched until the apparatus contacts the obstacle. I can't know if it exists. Then, the device may be damaged due to the contact between the obstacle and the device, or the device may be caught by an obstacle in the hole and the device cannot be removed from the hole.

  In view of this, an apparatus has been developed that can photograph not only the side of the apparatus but also the front of the apparatus (see Patent Document 2). Patent Document 2 discloses an apparatus in which a convex mirror is provided at the tip, and a camera is provided so that the convex mirror can be moved closer to and away from the convex mirror. In Patent Document 2, the inner wall of the hole can be photographed through the convex mirror when the camera is brought close to the convex mirror, and the situation in front of the apparatus can be photographed from the side space of the convex mirror when the camera is separated from the convex mirror. There is a statement to that effect.

JP 2000-145350 A JP-A-6-94452

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

  Moreover, in the case of the technique of Patent Document 2, it is impossible to confirm the front and the side at the same time. For this reason, since the situation of the inner wall of the hole must be confirmed again in detail from the side view after an overview of the situation of the inner wall of the hole in the front view, an extra inspection time is required.

  In view of the above circumstances, the present invention provides an in-cavity imaging apparatus and a concrete foundation inspection method capable of performing imaging in a cavity quickly and in a short time.

An in-cavity imaging apparatus according to a first aspect of the present invention is an apparatus for imaging inside a cavity by being inserted into the cavity, and a case portion extending in the axial direction and a tip of the case portion provided at a tip portion of the case portion A front photographing unit for photographing the front side, and a side photographing unit provided behind the front photographing unit, and each of the side photographing unit and the front photographing unit separately captures an image. It is characterized by being able to shoot.
The intracavity imaging device according to a second aspect of the present invention is the first aspect of the invention, wherein the case has a plurality of frame members arranged so that axial directions thereof are parallel to each other, and the plurality of frame members are separated from each other. A connecting member for holding the plurality of frame members, and the connecting member is disposed so as to form an internal space surrounded by the plurality of frame members, and the front photographing unit And the said side imaging | photography part is arrange | positioned in the said internal space, It is characterized by the above-mentioned.
The intracavity imaging device according to a third aspect of the present invention is the first or second aspect of the invention, wherein the cavity has a diameter of 40 mm or less, and the case is formed so that the maximum diameter of the cross section thereof is substantially the same as the diameter of the cavity. The side photographing unit includes a camera arranged so that an optical axis thereof is substantially coaxial with a central axis of the case, and a reflecting surface arranged on the front side of the camera and intersecting the optical axis of the camera. And an observation window that communicates the inside and outside of the case is provided on the side surface of the case, and the observation window uses reflection of the reflection surface of the reflection mirror. The camera is provided at a position where the inner wall of the cavity can be photographed.
An intracavity imaging device according to a fourth aspect of the invention is characterized in that, in the first, second or third aspect of the invention, a liquid supply device for supplying a liquid into the cavity is provided.
The intracavity imaging device according to a fifth aspect of the present invention is the in-cavity imaging device according to the fourth aspect, wherein the liquid supply section includes a liquid supply pipe having one end disposed in the case section, and a liquid supply section that supplies liquid from the other end of the liquid supply pipe And.
The in-cavity imaging apparatus according to a sixth aspect of the present invention is the apparatus according to any one of the first to fifth aspects, wherein the in-cavity imaging apparatus is an apparatus for imaging an inside of a cavity having a diameter of 40 mm or less formed on a concrete foundation.
The intracavity imaging device according to a seventh aspect of the present invention is characterized in that, in the sixth aspect, the cavity is a hole that is inclined with respect to the vertical direction.
(Inspection method for concrete foundation)
According to an eighth aspect of the present invention, there is provided a method for inspecting a concrete foundation, wherein a hole is formed from the surface of the concrete foundation, and the intracavity imaging device of the first, second or third invention is inserted from the opening of the hole formed in the surface of the concrete foundation. The inside of the cavity imaging device is moved along the hole to image the inner surface of the hole.
The method for inspecting a concrete foundation according to a ninth invention is characterized in that, in the eighth invention, a hole is formed obliquely with respect to the vertical direction in the concrete foundation.
The method for inspecting a concrete foundation according to a tenth aspect of the invention is the method according to the eighth or ninth aspect, wherein the air is blown into the hole to dry the inner wall of the hole, and The imaging device is inserted into the hole.
The concrete foundation inspection method according to an eleventh aspect of the present invention is the eighth, ninth or tenth aspect of the present invention, wherein the air supply pipe is inserted into the hole so that one end is located in the vicinity of the inner bottom surface of the hole, It is characterized by supplying.
A concrete foundation inspection method according to a twelfth aspect of the invention is the eighth, ninth, tenth or eleventh aspect of the invention, in a state where the intracavity imaging device according to any of the first to fifth aspects of the invention is inserted into the hole. A liquid is supplied into the hole.

According to the first invention, the front image and the side image of the case portion can be simultaneously photographed, so that the state of the inner wall of the cavity can be photographed while confirming the situation in front of the case portion. Therefore, in the situation where there are obstacles in the cavity, even if the inside of the cavity is moved while photographing the state of the inner wall of the cavity, the device may be damaged by contact between the obstacle and the device, It can be prevented that the device cannot be removed from the hole by being caught by an obstacle or the like. 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 photographing can be improved. .
According to the second aspect of the present invention, the case portion does not get caught even if the inner wall of the cavity has irregularities, and even if foreign matter enters inside the case portion, it can be discharged out of the case portion. Therefore, imaging of the inner wall of the cavity can be stably continued.
According to the third aspect of the invention, since the case portion can be stably disposed in the cavity, the device can be stably moved in the cavity even when the cavity is non-vertical. In addition, since the image can be taken at substantially the same conditions by the side photographing unit at any position in the circumferential direction of the cavity, the accuracy of inspection using the photographed image can be increased.
According to the fourth and fifth inventions, even when a turbid liquid is accumulated in the cavity, the turbid liquid can be replaced with the liquid supplied from the liquid supply device. If the liquid in the cavity becomes a liquid with little turbidity, the inside of the cavity can be photographed through the liquid.
According to the sixth and seventh inventions, even if the core removed when forming the cavity is easily damaged, it is possible to grasp cracks in the concrete foundation by photographing the inside of the cavity.
(Inspection method for concrete foundation)
According to the eighth and ninth inventions, a hole is formed in a concrete foundation, and the inside of the hole is photographed simply by inserting a photographing device into the hole. it can.
According to the tenth invention, since the wetness of the inner wall of the cavity can be reduced, it is possible to prevent the image of the inner wall of the cavity from being glaring due to the illumination of the camera as in the case where moisture exists in the inner wall of the cavity. It becomes easier to observe cracks and the like.
According to the eleventh and twelfth inventions, even if a turbid liquid is accumulated in the cavity, the liquid in the cavity can be made 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 imaging device 1 in a cavity of this embodiment. It is the schematic explanatory drawing which looked at the imaging device 1 in a cavity of this embodiment from the side. FIG. 3 is a schematic sectional view taken along line III-III in FIG. 2. 4A is a schematic cross-sectional view taken along line IVA-IVA in FIG. 3, and FIG. 4B is a schematic cross-sectional view taken along line IVB-IVB in FIG. 3. 1 is a schematic plan view of an intracavity imaging apparatus 1 according to the present embodiment provided with a holding shaft 3. FIG. FIG. 2 is a schematic explanatory diagram of an intracavity imaging apparatus 1 provided with a liquid supply unit 20. It is a schematic diagram of the situation where the cavity h formed in the concrete foundation B is inspected by the in-cavity imaging apparatus 1 of the present embodiment. It is a schematic explanatory drawing of the image image | photographed when image | photographing the cavity h formed in the concrete foundation B with the imaging device 1 in this embodiment, (A) is a front image, (B) It is a side image. (A) is schematic explanatory drawing of the work | work which test | inspects the inner wall w of the cavity h by the imaging device 1 of the cavity after drying the inner wall w of the cavity h by the air supply pipe AB, (B) is a liquid supply. FIG. 6 is a schematic explanatory diagram of an operation for inspecting an inner wall w of a cavity h by the intracavity imaging apparatus 1 including a unit 20. It is a schematic explanatory drawing of the image image | photographed when image | photographing the cavity h formed in the concrete foundation B with the imaging device 1 in this embodiment, (A) is an image in the state where the inner wall w is wet. Yes, (B) is an image after the inner wall w is dried. It is a schematic explanatory drawing of the image image | photographed when image | photographing the cavity h formed in the concrete foundation B with the imaging device 1 in this embodiment, (A) is the crack connected with the concrete foundation in the cavity h. (B) is an image taken while supplying clean water from the outside into the cavity h.

  The in-cavity imaging apparatus of the present invention is an apparatus for imaging the inside of a cavity formed in a concrete foundation or the like, and is characterized in that the side and front can be imaged simultaneously.

  The cavity imaged by the intracavity imaging apparatus of the present invention is not particularly limited. For example, use for photographing inside the hole formed in the concrete foundation, the hole formed in the concrete wall, the hole formed in the structure, etc. (hereinafter referred to as the hole formed in the concrete foundation). Can do. In general, when a hole is formed in order to inspect the condition of concrete, three types of diameters of the holes are generally 66, 86, and 116 mm. The intracavity imaging apparatus of the present invention can be used for imaging the inside of a hole having such a size, and even if the diameter of the hole is larger than 116 mm, the intracavity imaging of the present invention is used for imaging the inside of the hole. The device can be used.

  On the other hand, in the case of a reinforced concrete structure, that is, a structure in which structural reinforcement is arranged inside, it is necessary to form a hole so as to pass through a narrow gap between the structural reinforcements. 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 smaller diameter than the 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 in the cavity imaging apparatus of the present invention.

  The intracavity imaging apparatus of the present invention can be used for inspection of various holes such as a hole formed horizontally in a concrete foundation or the like, or a hole formed vertically. In particular, when photographing the inside of a hole formed obliquely with respect to the vertical direction or the horizontal direction, the intracavity photographing apparatus of the present invention can be used effectively. That is, in a structure formed such that its cross-sectional area decreases from the bottom to the top, such as a concrete foundation, 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 shifted in the horizontal direction. On the other hand, when a hole is formed in a concrete foundation by boring, the hole is formed so as to sew a gap between the structural bars so as not to damage the structural bars. Then, the hole to be formed is formed obliquely with respect to the vertical direction. Moreover, the diameter of such inclined holes cannot be so large. As an apparatus for inspecting the inside of a hole (for example, a hole of 40 mm or less) having a diameter smaller than that of a normal concrete inspection formed obliquely with respect to the vertical direction, the intracavity photographing apparatus of the present invention is effectively used. can do.

  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, and the situation where 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. The intracavity imaging apparatus of the present invention can also be effectively used for such imaging.

  Below, the case where the inside of the hole formed in the concrete foundation is image | photographed with the imaging | photography apparatus in a cavity of this invention, and the presence or absence of a crack of concrete is test | inspected is demonstrated as a representative. In the following description, a hole photographed by the intracavity photographing apparatus of the present invention is referred to as a cavity h.

(In-cavity imaging device 1 of this embodiment)
Next, the structure of the intracavity imaging apparatus 1 of the present embodiment will be described based on the drawings.

(In-cavity imaging device 1 of this embodiment)
As shown in FIG. 1, the intracavity imaging device 1 of the present embodiment includes an imaging device 2 provided with an imaging unit that images the interior of the cavity h, and a control unit 5 connected to the imaging device 2. I have.

  As shown in FIG. 2, the photographing apparatus 2 is an apparatus formed in a substantially rod shape, and includes a front photographing section C1, a side photographing section C2, and a reflecting mirror M that are held by a case portion 10 (see FIG. 1). And.

(Case 10)
The case portion 10 is formed so that the diameter thereof is slightly smaller than the diameter of the cavity h for photographing the inside. For example, if the case portion 10 is inserted 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 than the diameter of the cavity h. It is formed as small as about 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. In addition, 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.

  A case where the front photographing unit C1, the side photographing unit C2, the reflecting mirror M, and the codes Ca and Cb described later are not in contact with the inner wall w of the cavity h when the photographing apparatus 2 is inserted into the cavity h. It is attached to the part 10. That is, the case portion 10 is formed in a shape that can protect the front photographing portion C1 and the like, but details will be described later.

(Front shooting part C1)
As shown in FIGS. 2 and 3, the front photographing unit C <b> 1 is attached to the case unit 10 so as to be positioned in the vicinity of the tip of the photographing apparatus 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 photographing unit C1 has a front end surface disposed at a front end opening of the case unit 10 so that the camera c can photograph the front of the photographing apparatus 2. That is, the front photographing unit C <b> 1 is attached to the case unit 10 so that the camera c faces the front of the photographing apparatus 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 front photographing unit C1 is connected to the control unit 5 by a cord Ca (see FIG. 1). The cord Ca is wired along the axial direction of the photographing apparatus 2 so as not to come out from the side of the photographing apparatus 2, and is drawn outward from the rear end of the photographing apparatus 2 (FIGS. 2 and 3). reference). The code Ca is wired at a position where it does not interfere with the rear photographing unit C2 and the reflecting mirror M. For example, the code Ca is wired so as to pass through the side of the rear photographing unit C2 and the reflecting mirror M. In addition, since it is assumed that groundwater or the like intrudes into the cavity h, when photographing underwater, the front photographing unit C1 and the rear photographing unit C2 are waterproof.

(Rear shooting part C2)
As shown in FIGS. 2 and 3, the rear photographing unit C2 is attached to the case unit 10 so as to be located behind the aforementioned front photographing unit C1. For example, in FIGS. 2 and 3, the camera unit 2 is attached to the case unit 10 so as to be located behind the middle in the axial direction of the imaging device 2. Similarly to the front photographing unit C1, the rear photographing unit C2 is also provided with a camera c on the tip surface, and a light source f such as an LED light is provided so as to surround the camera c (see FIG. 4B). ). The rear 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. The rear photographing unit C2 is connected to the control unit 5 by a cord Cb (see FIG. 1). The cord Cb is wired along the axial direction of the photographing apparatus 2 and is drawn outward from the rear end of the photographing apparatus 2.

(Reflector M)
As shown in FIGS. 1 to 3, a reflecting mirror M is provided in front of the rear photographing unit C2. The reflecting mirror M is provided such that the reflecting surface Ma faces the camera c of the rear photographing unit C2. Moreover, the reflecting mirror M has the center of the reflecting surface Ma located on the extension line of the center axis CL of the image capturing device 2 (that is, the optical axis of the camera c of the rear image capturing unit C2), and the reflecting surface Ma is the image capturing device 2. It is provided so as to be inclined with respect to the central axis CL. For example, the reflection surface Ma is provided so that the inclination angle θ with respect to the central axis CL of the imaging device 2 is 45 degrees. If the inclination angle θ of the reflecting surface Ma is 45 degrees, the camera c of the rear 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, an image directly beside the photographing device 2 at the position of the reflecting surface Ma can be photographed by the camera c of the rear photographing unit C2.

  Further, the size of the reflecting mirror M is not particularly limited, but is preferably as large as possible in order to make the area captured by the camera c of the rear imaging unit C2 as wide as possible. For example, it is preferable that the reflecting surface M of the reflecting mirror M is larger than the range in which the camera c of the rear photographing unit C2 can shoot at the position of the reflecting mirror M.

  On the other hand, the reflecting mirror M may be of 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 imaging 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, it is preferable that the cord Ca of the photographing unit C1 is large enough not to protrude from the outer surface of the case unit 10. Of course, in order to make the reflecting mirror 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 photographing unit C1 and the side photographing unit C2 by codes Ca and Cb. The control unit 5 has a function of supplying power to the camera c and the light source f of the front photographing unit C1 and the side photographing unit C2, and acquiring and storing an image photographed by the camera c. Have. For example, a computer installed with a control program for controlling the operations of the front photographing unit C1 and the side photographing unit C2 can be used as the control unit 5. However, the control unit 5 can be used with any device having the above functions.

  The control unit 5 also controls the timing at which the camera c of the front imaging unit C1 and the camera c of the side imaging unit C2 capture images. For example, the control unit 5 can perform control so that the camera c of the front image capturing unit C1 and the camera c of the side image capturing unit C2 respectively capture images separately (that is, the front image and the side image). That is, the side photographing unit C2 may be controlled to photograph the side of the photographing apparatus 2 regardless of the photographing state of the front photographing unit C1. In other words, the operation of the camera c may be controlled so that the front photographing unit C1 and the side photographing unit C2 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 imaging unit C1 captures an image and the timing at which the side imaging unit C2 captures an image are linked.

  The control unit 5 also has a display unit d that can display an image captured by the camera c, and a function (display) that reproduces and displays 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 reproduction 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, a rough state of the inner wall w of the cavity h can be grasped by displaying an image captured by the camera c of the front imaging unit C1 on the display unit d. And after grasping | ascertaining the state of the inner wall w of the cavity h roughly, the inner wall w of the cavity h can be image | photographed with the camera c of the side imaging | photography part C2. Then, the state of the inner wall w of the cavity h can be confirmed in detail by displaying the image captured by the camera c of the side imaging unit C2 on the display unit d. Further, when an image captured by the camera c of the front photographing unit C1 is displayed on the display unit d while the photographing device 2 is inserted into the cavity h, a front obstacle (a protrusion on the inner wall of the cavity h, Can grasp sediment such as water and stone). Then, it is possible to prevent the photographing apparatus 2 from being damaged due to collision with an obstacle or the like, or the photographing apparatus 2 being caught by an obstacle in the hole and being unable to be removed.

(Holding shaft 3)
Further, the photographing device 2 is configured such that the holding shaft 3 can be connected to the rear end of the case portion 10. Specifically, the holding shaft 3 can be coupled so that the axial direction thereof 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).

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

  Note that the holding shaft 3 may have a structure that can be expanded and contracted in order to prevent the portability and handling from deteriorating and to make the holding shaft 3 have a certain length. For example, the holding shaft 3 having a structure in which a plurality of cylindrical shaft members are connected in a telescopic manner may be used.

Further, the holding shaft 3 is not necessarily provided. For example, if the cavity h is formed vertically, the imaging apparatus 2 can be moved within the cavity h even if the imaging apparatus 2 is suspended by a string or a wire. Alternatively, the imaging device 2 may be moved in the cavity h by holding the frame portion 10 of the imaging device 2 with a shaft having a clamp or the like.

(Inspection method for concrete foundation using in-cavity imaging apparatus 1 of this embodiment)
Since the in-cavity imaging apparatus 1 of the present embodiment has the above-described configuration, the inside of the cavity h formed in the concrete foundation can be imaged to inspect the concrete foundation.

  First, as shown in FIG. 7, the surface of the concrete foundation B to be inspected has an opening, and a cavity h is formed from the opening toward the inside. Specifically, the tubular member is caused to enter the concrete foundation B by a method such as turning from a state in which a tubular member having a blade at the tip is applied to the surface of the concrete foundation B. And if a cylindrical member penetrates to a certain depth, the cylindrical member is extracted from the concrete foundation B. Then, the cavity h which has an opening in the surface and extends toward the inside from the opening can be formed in the concrete foundation B. In addition, the concrete base B which existed in the part used as the cavity h is contained in the inside of a cylindrical member (boring core), and this boring core can also be used for the inspection of the concrete foundation B.

  If the depth of the cavity h does not reach the depth to be inspected, insert a longer cylindrical member, a connected cylindrical member or the like into the formed cavity h, and The same operation is performed to form a deeper cavity h.

  Then, when the cavity h extending almost straight up to the originally planned depth is formed, imaging by the intracavity imaging apparatus 1 is performed in the following procedure. Note that the hollow h extending substantially straight means the hollow h having linearity that allows the intra-cavity imaging apparatus 1 of the present embodiment to move. For example, a cavity h whose central axis is coaxial over the entire length, a cavity h where the center of the section of the cavity h is slightly shifted depending on the position in the length direction, a cavity h where there is a slightly bent part, All of these include a cavity h that extends substantially straight.

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

  When the holding shaft 3 is connected to the imaging device 2, the holding shaft 3 is held, and the imaging device 2 is inserted into the cavity h from the tip (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 imaging device 2 moves smoothly in the cavity h without rattling in the cavity h.

  If the photographing by the front photographing unit C1 of the photographing device 2 is performed while the photographing device 2 is advanced in the cavity h and the image of the front photographing unit C1 is displayed on the display unit d of the control unit 5, the inside of the cavity h is obtained. While confirming the situation, the imaging device 2 can be allowed to enter the cavity h. Then, even if aggregates or the like are exposed on the inner wall w of the cavity h, or fragments or the like generated when forming the cavity h are present in the cavity h, the existence of these objects can be grasped in advance. . Therefore, the photographing apparatus 2 can be prevented 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 is a crack or the like in the inner wall w of the cavity h. Even if it can be grasped, there is a case where the detailed situation of the crack cannot be sufficiently grasped. For example, if the inner diameter of the cavity h is 40 mm or less, the camera c of the usable front photographing unit C1 can use only those having a diameter of about 10 mm at most. A camera having such a caliber has a small angle of view, so although it is possible to photograph the inner wall w of the cavity h, it is difficult to photograph a clear image of the inner wall w. For example, if the width of the crack is about 0.2 mm or less, the presence of the crack can be confirmed by the image of the camera c of the front photographing unit C1, but the state of the crack cannot be grasped.

  However, the photographing apparatus 2 includes the side photographing unit C2, and the side surface can be photographed by the camera c of the side photographing unit C2 through 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 substantially the same state as the case where the inner wall w of the cavity h is in front of the camera c. Therefore, a clear image of the inner wall w of the cavity h can be taken even if the aperture of the camera c of the side imaging unit C2 is about 10 mm (see FIG. 8B). In other words, a clear image of the inner wall w of the cavity h can be captured by the imaging device 2 even if the cavity h has a diameter of 40 mm or less.

  Therefore, when the presence of a 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 region of the camera c of the side photographing unit C2 is positioned at that position. And if the image of the inner wall w of the cavity h is image | photographed with the camera c of the side imaging | photography part C2, the state of a crack can be grasped | ascertained in detail.

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

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

  When photographing of the entire cavity h is completed, the inspection of the concrete foundation B is completed if the photographing device 2 is extracted from the cavity h and then the cavity h is filled with concrete or the like.

  As described above, if the concrete foundation B is inspected using the in-cavity imaging apparatus 1 of the present embodiment, it is possible to inspect to the desired depth of the concrete foundation B simply 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 performed in a shorter time than the inspection that has been conventionally performed, and restrictions such as the inspection object 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. And concrete foundation B is exposed to the depth which wants to inspect, and it inspects from the exposed part. In this case, a very large construction is required to expose the concrete foundation B. In particular, in the case of a concrete foundation B installed in a river, the surrounding water must be blocked to expose the concrete foundation B, which requires a long period of work and cost.
In addition, because long-term work is required, inspections cannot be performed during periods of unstable weather (rainy season, typhoon season, snowfall season, etc.), and the time of inspection is relatively stable. There is also a restriction that it is limited.
Moreover, since the concrete foundation B originally buried in the ground is exposed, the concrete foundation B cannot exhibit a predetermined durability (ability to support a 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, there is a problem that the durability of concrete foundation B is reduced, the working time is prolonged, and the cost is low. At present, it is impossible to inspect all concrete foundations B at the same time. Inspecting concrete foundation B.
And since the durability of the concrete foundation B is reduced during the inspection work, there is a risk of collapse of the structure when an earthquake or the like occurs during the inspection work. In particular, since the inspection is carried out by entering the part dug down by the worker, the risk is high for the worker.

  On the other hand, if the concrete foundation B is inspected using the in-cavity imaging apparatus 1 of the present embodiment, the concrete foundation B can be inspected as it is installed. That is, if the cavity h is formed from the exposed surface (for example, the upper surface) of the concrete foundation B into the concrete foundation B, the inspection can be performed simply by inserting the imaging device 2 into the cavity h. . If the diameter of the cavity h is sufficiently smaller than the concrete foundation B, the durability of the concrete foundation B is hardly affected even if the cavity h is formed. Therefore, the concrete foundation B can be safely inspected by using the intracavity imaging apparatus 1 of the present embodiment. In addition, the work from the formation of the cavity h to the embedding of the cavity 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, etc., and even the structure having a plurality of concrete foundations B can be inspected at almost the same time. And in the test | inspection using the imaging device 1 in a cavity of this embodiment, if it has the surface which the concrete foundation B has exposed, it can test | inspect. Then, it is possible to easily carry out the inspection on the concrete foundation B in any place (for example, the concrete foundation B installed in the river).

  In addition, in inspecting the inner surface of the cavity h formed in the concrete foundation B or the like by the intracavity imaging apparatus 1 of the present embodiment, it is important to grasp which depth is inspected (photographed). Therefore, if a measure or the like is provided along the holding shaft 3, it is possible to grasp how deep the photographing apparatus 2 is arranged. Of course, the holding shaft 3 itself may be provided with a scale so as to grasp the depth at which the imaging device 2 is arranged, or the imaging device 2 is arranged by a non-contact type distance measuring device such as a laser distance meter. You may make it grasp | ascertain the depth which is.

(Case 10)
As described above, the case unit 10 has the function of protecting the front photographing unit C1 and the like, and the central axes of the front photographing unit C1 and the rear photographing unit C2 are arranged so that the central axis of the cavity h is coaxial or substantially coaxial. The shape is not particularly limited as long as it has a structure that exhibits functions. For example, a hollow cylindrical member may be used as the case portion, and the front photographing unit C1, the side photographing unit C2, the reflecting mirror M, the cords Ca, Cb, and the like may be accommodated therein. In this case, an opening through which the camera c of the front photographing unit C1 photographs the front is provided at the front end of the case part, and the camera c of the side photographing part C2 photographs the side via the reflector M on the side surface of the case part. A window (observation window) will be provided. Then, the front and side photographing units C1 and the side photographing unit C2 can photograph the front and the side, and the case unit 10 can protect the front photographing unit C1 and the like.

  In addition, 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 part 10 may be caught by the irregularities, and if the inner wall w easily peels off, the peeled object may enter the case part 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 part 10 is inserted into the cavity h, and the case part 10 itself becomes smaller (in other words, the diameter becomes smaller). become. However, if the case portion 10 has the following structure, even when the inner wall w is uneven, the influence of the unevenness can be reduced when the photographing apparatus 2 is moved. Further, even if an object or the like with the inner wall w peeled invades into the case portion 10, the intruded object can be discharged out of the case portion 10 easily and quickly.

  As shown in FIGS. 2 and 3, the case portion 10 includes an annular plate group 11 having a plurality of annular plates 11 a (four in each of FIGS. 2 and 3), and a circle having an annular plate 12 a. An annular plate group 12. The annular plate group 11 holds the above-described front photographing unit C1, and the annular plate group 12 holds the side photographing 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 positioned on the same axis (the central axis of the annular plate group 11). That is, the plurality of annular plates 11a are arranged such that the center of the hole n is located on the same axis (the central axis of the annular plate group 11). And the above-mentioned front imaging | photography part C1 and code | cord | chord Ca are penetrated and fixed to the hole n (refer FIG. 4 (A)) of the some annular plate 11a.

  The annular 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-like 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 front end side (see FIG. 4A), and are adjacent in the circumferential direction. It arrange | positions so that a clearance gap may be made between the frame plates 11b to perform. In addition, the four frame plates 11b have the outer edge e protruding from the outer peripheral edge of the annular plate 11a and the same distance from the outer edge e to the central axis of the annular plate group 11 (or The distances are approximately the same. The almost same distance here means that a difference of about several mm is allowed.

  Similarly to the annular plate group 11, the annular plate group 12 also has a plurality of annular plates 12 a (four in FIG. 2 and FIG. 3) centered on the same axis (the central axis of the annular plate group 12). Are arranged at almost equal intervals. That is, the holes n of the plurality of annular plates 12a are also arranged so that the centers thereof are located on the same axis (the central axis of the annular plate group 12). The above-described side photographing unit C2 and the cord Cb are inserted and fixed in the holes n of the plurality of annular plates 12a.

  The annular 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-like members having the same shape. Similarly to the four frame plates 11b of the annular plate group 11, the four frame plates 12b are also radial with respect to the central axis of the annular plate group 12 and are adjacent to each other in the circumferential direction. It arrange | positions so that a clearance gap may be made between them. Moreover, the four frame plates 12b have the outer edge e protruding from the outer peripheral edge of the annular plate 12a and the same distance from the outer edge e to the central axis of the annular plate group 12 (or The distances are approximately the same. 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 plates 13 and 14. The pair of connecting plates 13 and 14 are long plate-like members having substantially the same shape, and are substantially the same in structure as the frame plates 11b and 12b described above 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 coupled by a pair of coupling frames 13 and 14. Specifically, the annular plate group 11 and the annular plate group 12 are paired with a pair of connecting frames 13 and 14 so that the central axis of the annular plate group 11 and the central axis of the annular plate group 12 are coaxial. Are connected by Moreover, the annular plate group 11 and the annular plate group 12 are paired so that a space is provided in which the reflecting mirror M is disposed between the rear end of the annular plate group 11 and the front end of the annular plate group 12. They are connected by connecting frames 13 and 14. In the space where the reflecting mirror M is disposed, 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 annular plate group 11 and the front end of the annular plate group 12 and between the pair of connecting frames 13 and 14 in the circumferential direction corresponds to an observation window referred to in the claims. To 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 connection frames 13, 14, the pair of connection frames 13, 14 and the frame plates 11b, 12b are connected to each other. The imaging device 2 can function as a guide when moving along the inner wall w of the cavity h. Then, the imaging device 2 can be smoothly moved in the cavity h.

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

  The four frame plates 11b and the pair of connecting frames 13 and 14 desirably have inclined surfaces on the outer end surfaces on the tip 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 tip. If the four frame plates 11b and the pair of connecting frames 13 and 14 have such inclined surfaces, the imaging device 2 can be easily inserted into the cavity h, and the imaging device 2 can be advanced in the cavity h. The advantage that the resistance is reduced is obtained.

  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 end surface 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 11b and the pair of connecting frames 13 and 14 have such inclined surfaces, there is an advantage that resistance is reduced when the photographing apparatus 2 is retracted in the cavity h.

The gap formed between the pair of connection frames 13 and 14, the gap formed between the pair of connection frames 13 and 14, the frame plates 11b and 12b, and the ring plates 11a and 12a, the ring plate 11a, The hole n of 12a is equivalent to the internal space referred to in the claims.
Further, the pair of connection frames 13 and 14 and the frame plates 11b and 12b correspond to a plurality of frame members referred to in the claims, and the annular plates 11a and 12a correspond to the connection members referred to in the claims.

  In addition, the code Ca of the front photographing unit 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 cord Ca of the front photographing section C1 passes so that the code Ca of the front photographing section C1 does not protrude from the outer surface of the case section 10 (FIG. 4 ( B)). Of course, you may provide the through-hole which penetrates the code | cord | chord Ca of the front imaging | photography part C1 in the annular plate 12a.

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

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

(Focus adjustment mechanism of the camera c of the side photographing unit C2)
In order to clearly capture the inner surface of the cavity h by the camera c of the side imaging unit C2, it is necessary to adjust the focal length of the camera c of the side imaging unit C2 in accordance with the diameter of the cavity h. That is, it is necessary to adjust the distance between the camera c and the reflecting surface Ma of the side photographing unit C2 so that the focal position is almost the inner surface of the cavity h. For example, if the annular plate group 12 is provided with a fixing and releasing mechanism that can move and fix the camera c of the side photographing unit C2 along the axial direction of the case unit 10, the camera c of the side photographing unit C2 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 release the camera c of the side photographing unit C2. Then, if the clamp is tightened, the camera c of the side photographing unit C2 can be fixed to the annular plate group 12, and if the clamp is loosened, the camera c of the side photographing unit C2 is moved along the axial direction of the case unit 10. be able to.

  The annular plate group 12 is provided with a plurality of screws that advance and retract in the radial direction. 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 the 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 side photographing section C2, the camera is moved by the tip 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 side photographing unit C <b> 2 can be moved along the axial direction of the annular plate group 12.

  Since the camera c of the side photographing unit C2 is inserted into the holes n of the four annular plates 12a, when moving the camera c of the side photographing unit C2 along the axial direction of the case unit 10, 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 and the reflecting surface Ma of the side photographing unit C2 is adjusted, it is possible to suppress the photographing position (the axial position or the circumferential position of the cavity h) from being changed. . That is, if the inclination angle θ of the reflective surface Ma is 45 degrees, the image capturing device at the position of the reflective surface Ma is adjusted even if the distance between the camera c and the reflective surface Ma of the side image capturing unit C2 is adjusted. 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 rear photographing unit C2 so as to be movable and fixed. Good. For example, the stay 15 to which the reflecting mirror M is fixed is movable 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 rear photographing unit C2 is fixed so as not to move along the axial direction of the case unit 10. Then, if the stay 15 to which the reflecting mirror M is fixed is moved, the distance between the camera c and the reflecting surface Ma of the rear photographing unit C2 can be adjusted.

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

  However, if 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 moisture on the inner wall w of the cavity h. Then, the image becomes difficult to see due to the reflected light, and even if there is a crack or the like on the inner wall w of the cavity h, it is 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 that after the inner wall w of the cavity h is dried to some extent, the imaging apparatus 2 is placed in the cavity h and inspected. For example, as shown in FIG. 9A, after the ground water or the like in the cavity h is extracted, the air pipe AP is inserted into the cavity h. Then, one end of the air pipe AP is disposed in the vicinity of the inner bottom surface of the cavity h. Thereafter, a gas such as air is supplied to the other end of the air pipe AP by a blower AB or the like. Then, the gas is blown into the cavity h from one end of the air supply pipe AP, moves along the inner wall w of the cavity h, and is discharged from the opening of the cavity h to the outside. 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 gas flow. Then, since it can prevent that the light from the light source f of the camera c is reflected by the water | moisture content of the inner wall w of the cavity h, it becomes easy to discover the crack of the inner wall w of the cavity h, etc. (FIG. 10 ( B)).

  The gas blown into the cavity h through the air pipe AP is not particularly limited. What has a high effect of drying liquid, such as water adhering to the inner wall w of the cavity h, is preferable. For example, if hot air or hot air of about 200 to 300 degrees is generated using a commercially available heat gun and the hot air or hot air is blown into the cavity h through the air pipe AP, the water adhering to the inner wall w of the cavity h The effect of drying the liquid can be increased.

(Still another example of inspection by the intracavity imaging apparatus 1 of the present embodiment)
Moreover, when drainage in the cavity h is difficult, for example, groundwater or the like continues to enter the cavity h to be inspected by the in-cavity imaging apparatus 1 of the present embodiment, the inspection may be performed while the groundwater or the like remains.

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

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

  And the liquid supply part 22 which has liquid feeding functions, such as a pump, is connected with the proximal end of the liquid feeding pipe | tube 21. FIG. The liquid supply unit 22 has a function of pressurizing the liquid and supplying it to the liquid feeding pipe 21.

  When the liquid supply unit 20 is provided, as illustrated in FIG. 9B, the imaging device 2 is inserted into the cavity h in which groundwater or the like is contained. If clean water (water with little turbidity, such as tap water) is supplied into the cavity h from the liquid supply unit 22 in this state, the turbid groundwater in the cavity h is replaced with clean water. Then, even if water exists in the cavity h, the inner wall w of the cavity h can be photographed. In addition, 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 photographing of the inner wall w of the cavity h may be performed while supplying the liquid from the liquid supply unit 20, but the liquid is supplied after the transparency of the liquid in the cavity h has no problem in photographing. 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 extracted by a pump or the like so that the liquid does not overflow from the opening of the cavity h. It may be.

  You may repeat supply and a stop of a liquid during imaging | photography. For example, the photographed image may be confirmed, and liquid may be supplied when the transparency is lowered, and liquid supply may be stopped when there is no trouble in photographing. In this case, if the control unit 5 is provided with a function for controlling the operation of the liquid supply unit 22 and a function for determining the transparency of the liquid based on the captured image, the supply of the liquid by the liquid supply unit 20 based on the captured image. It is also possible to cause the control unit 5 to control the stop.

  Further, when this method is adopted, since the photographing device 2 is immersed in a liquid, waterproof cameras are 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 the camera c from being damaged by floating substances such as dust contained in the groundwater, it is desirable to use the camera c having a dustproof performance. For example, it is desirable to use a camera c having a use level of IP57 or higher, preferably IP68 or higher, representing a dustproof and waterproof performance.

  Furthermore, since the liquid exists in the cavity h, the friction between the inner wall w of the cavity h and the imaging device 2 can be reduced, so that the resistance when the imaging device 2 moves in the cavity h can be reduced.

  The in-cavity imaging apparatus of the present invention is suitable as an apparatus for inspecting a situation in a cavity formed in a building such as a concrete base, a bridge pier, or an outer wall.

DESCRIPTION OF SYMBOLS 1 In-cavity imaging device 2 Imaging device 3 Holding shaft 5 Control part 10 Case part 11a Ring plate 11b Frame plate 12a Ring plate 12b Frame plate 13 Connection plate 14 Connection plate 20 Liquid supply part 21 Liquid supply pipe 22 Liquid supply part C1 Front imaging unit C2 Rear imaging unit M Reflector Ma Reflecting surface h Cavity w Inner wall AP Air pipe AB Blower

Claims (12)

A device that is inserted into a cavity and images the inside of the cavity,
A case portion extending in the axial direction;
A front photographing unit that photographs the front from the front end of the case provided at the front end of the case;
A side photographing unit provided behind the front photographing unit, and
The side photographing unit and the front photographing unit are
An intracavity imaging device characterized in that it can individually capture images. The case is
A plurality of frame members arranged such that the axial directions are parallel to each other;
A connecting member that holds the plurality of frame members so that adjacent frame members are spaced apart from each other in the circumferential direction of the case, and
The connecting member is
It is arranged so that an internal space surrounded by the plurality of frame members is formed,
The in-cavity imaging apparatus according to claim 1, wherein the front imaging unit and the side imaging unit are disposed in the internal space. The case is
The maximum diameter of the cross section is formed to be substantially the same as the diameter of the cavity,
The side photographing unit is
A camera arranged such that the optical axis is substantially coaxial with the central axis of the case;
A reflecting mirror disposed on the front side of the camera and having a reflecting surface intersecting the optical axis of the camera,
On the side of the case,
An observation window that communicates the inside and outside of the case is provided,
The observation window
The in-cavity imaging apparatus according to claim 1 or 2, wherein the camera is provided at a position where the camera can image an inner wall of the cavity by using reflection of a reflecting surface of the reflecting mirror. 4. The intracavity imaging apparatus according to claim 1, further comprising a liquid supply device that supplies a liquid into the cavity. The liquid supply unit is
A liquid feeding pipe having one end arranged in the case part;
The intracavity imaging apparatus according to claim 4, further comprising: a liquid supply unit that supplies liquid from the other end of the liquid feeding pipe. The intracavity imaging apparatus according to any one of claims 1 to 5, wherein the intracavity imaging apparatus is an apparatus for imaging an inside of a cavity having a diameter of 40 mm or less formed on a concrete foundation. The cavity is
6. The intracavity imaging apparatus according to claim 5, wherein the imaging device is a hole that is inclined with respect to a vertical direction. Forming holes from the surface of the concrete foundation,
Inserting the intracavity imaging device according to any one of claims 1 to 5 from an opening of a hole formed in a surface of a concrete foundation,
A method for inspecting a concrete foundation, characterized in that an imaging device inside a cavity is moved along a hole to image the inner surface of the hole. 9. The method for inspecting a concrete foundation according to claim 8, wherein holes are formed in the concrete foundation obliquely with respect to the vertical direction. The concrete foundation according to claim 8 or 9, wherein after the gas is blown into the hole to dry the inner wall of the hole, the in-cavity imaging device according to claim 1, 2 or 3 is inserted into the hole. Inspection method. The method for inspecting a concrete foundation according to claim 8, 9 or 10, wherein an air supply pipe is inserted into the hole so that one end is positioned in the vicinity of the inner bottom surface of the hole, and gas is supplied from the other end of the air supply pipe. . The concrete foundation according to claim 8, 9, 10 or 11, wherein a liquid is supplied into the hole in a state where the in-cavity imaging device according to any one of claims 1 to 5 is inserted into the hole. Inspection method.