JPH1130755A - Observing method by underwater television camera and its observation part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily realize direct viewing and side viewing though retained water is muddy by sending pure water into a substance existing more downward than an underwater television camera and obstructing the observation thereof and eliminating an obstructing function by the substance. SOLUTION: An observation part is hung down in a hole by connecting a casing 1 to a hanging tube 5 and connecting a conductor 6 to a hose joint 4. Then, a light source 3 is turned on so as to irradiate and inspect the bottom of the hole and the inside wall surface of a screen, the casing and the like by the underwater television camera 2. Then, the condition thereof is observed by a monitor set on the ground. When an image on the monitor is not clear or it is not projected because the water is muddy, the pure water is sent into the conductor 6. Then, the pure water flows into the lower part of the camera 2 from the joint 4 so as to dilute the muddy water. By sending the pure water, the retained water is easily and quickly diluted or eliminated even when it is muddy. Thus, since the observation obstructing function is eliminated, the observation can be correctly executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an observation method and an observation section using an underwater television camera, and in particular, to a method for observing the inside of a hole to check the finished condition of a well or the presence or absence of a defect on the inner wall surface of a hollow pile. It relates to an observation unit used directly in this method.

[0002]

2. Description of the Related Art When observing the inside of a well or the hole of a hollow pile made of concrete or steel pipe with an underwater television camera, if water remaining in the hole is turbid, television observation was not possible. Using a coagulant such as ban earth (Al ₂ (SO ₄ ) ₃ ), the water was purified by injecting the water into a required depth through a tremy pipe and coagulating and sedimenting the surrounding colloid and other suspensions.

[0003]

However, the above-mentioned method has a problem that it takes time and labor, and furthermore, depending on the suspended matter, water purification is not always successful. An object of the present invention is to send clear water in front of a television camera so that direct or side viewing can be easily performed.

[0004]

According to a first observation method of the present invention, an underwater television camera whose optical axis is directed downward in a vertical direction is suspended in a well or a hollow pile to observe the inside thereof. The fresh water is fed into a substance which is below the underwater television camera and obstructs the observation, so that the obstruction function of the substance is lost.

In the second observation method, while the optical axis of the underwater television camera in the first observation method is vertically downward,
The difference is that they are oriented horizontally. In this case, clear water is fed into a substance which is located in front of the underwater television camera and obstructs the observation, so that the obstruction function of the substance is lost.

A first observation section according to the present invention is used in the first observation method, and has a casing, an underwater television camera, a light source, and a hose joint. The casing is open at the lower end, and the upper end serves as a connection portion with the hanging tube at the observation port. The underwater television camera is disposed in the casing with its optical axis directed toward the observation port. The light source is disposed on the casing with its optical axis parallel to the optical axis of the underwater television camera. The hose joint is connected to a conduit of fresh water, and is disposed on an outer surface of a side wall of the casing with an inner end of the axis directed downward of the underwater television camera.

The second observation section according to the present invention is used in the above-mentioned second observation method, and the casing has an observation tube protruding from a side surface with an open end and an observation port at the upper end with a hanging tube. Connection part. The underwater television camera is disposed in the casing with its optical axis directed toward the observation port. The light source is disposed on the casing with its optical axis parallel to the optical axis of the underwater television camera. The hose joint is connected to a fresh water conduit, and is disposed on an outer surface of a side wall of the casing so that an inner end of an axis of the hose joint faces forward of the underwater television camera.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION When a well screen or casing is built in a hole drilled with a drill bit by filling or circulating muddy water, the screen and casing are filled with muddy water because the inside of the hole is filled with muddy water. The mud is filled with mud.

[0009] In order to observe the finished condition of the well, damage to the inner wall surface of the pile, etc., an underwater TV camera is suspended in the hole as usual, and residues on the hole wall and the bottom of the hole during drilling, for example, bolts Observe the presence of tools, and remove any that remain. In addition, observe the inner wall surface of each of the screen, casing, and pile to check for any damage or clogging.

At the time of this observation, the light beam for illumination is blocked depending on the substance mixed in the muddy water, making observation with a camera difficult or impossible.

[0011] In the first observation method of the present invention, the optical axis of the camera is directed downward in the vertical direction, and fresh water is fed into a substance which is below the camera and obstructs the observation. The substance here refers to mud containing colloids and other suspensions. The muddy water is diluted or eliminated by this clear water, and the obstruction function is lost, and the light beam penetrates the water to allow the camera to observe the bottom of the hole or the inner wall surface of the screen, casing, pile or the like.

If the accumulated water in the holes is cloudy, it cannot be observed with an underwater television camera, so that a coagulant for coagulating colloids and other suspended matter is injected, and the water is purified for a long time. Becomes unnecessary.

In the second observation method of the present invention, the optical axis of the camera is oriented in the horizontal direction, and fresh water is fed into a substance which is located ahead of the camera and hinders the observation. The operation is the same as that of the first observation method, and it is possible to observe the inner wall surface of a screen, a casing, a pile, and the like, and the hole wall surface during digging by a camera.

The first observation unit according to the present invention is used for a first observation method. The underwater television camera itself and its mode of use are of normal type. This observation unit is characterized in that it has a hose joint. This hose joint is for connecting to a conduit for fresh water, and is disposed on the outer surface of the side wall of the casing with the inner end of its axis directed downward under the underwater television camera.

The term "downward" means that a light beam emitted from the light source is reflected on the surface to be observed and includes an optical path incident on the underwater television camera.

The observation portion is suspended in a well or a pile by connecting a connection portion at an upper end thereof to a lower end portion of a suspension pipe as usual. At this time, a conduit for fresh water is also connected to the hose joint.

When the observation unit is lowered to a predetermined position, the light source is turned on, the underwater television camera is activated, and the inner wall surface of the screen, casing, or pile is inspected, and the image projected on the monitor on the ground is observed to be lost. Investigate the presence or absence of etc. The light source is disposed on the casing so as to be positioned around the underwater television camera, and the light source is disposed on an attachment having a rod suspended from the casing and withdrawn at the tip thereof. In each case, it is conventional and “disposed with respect to the casing” means both cases.

When the muddy water is turbid and the image on the monitor is unclear, fresh water is fed into the conduit. The fresh water flows from the end of the hose joint to below the underwater television camera, and dilutes or removes the turbid water that has accumulated there. As a result, the light beam passes through the water, and the image can be captured by the underwater television camera.

The second observation section is used in a second observation method. The difference from the first observation unit is that the hose joint is attached to the outer surface of the observation tube protruding from the side surface of the casing. Suitable for inspection of inner wall surfaces of screens, casings, piles, etc. or wall surfaces of holes during drilling. The underwater television camera in this case is of a type that can be rotated on a horizontal plane by a motor as usual.

When the accumulated water is turbid and it is difficult or impossible to take an image with the underwater television camera, fresh water is supplied to dilute or eliminate the turbid water in front of the underwater television camera to enable imaging.

For the meaning of "forward" here, reference is made to the description of the case of "downward" in the first observation section.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view and FIG. 2 is a bottom view showing specific examples of first and second observation sections used in carrying out first and second observation methods according to the present invention. FIG. 3 is a side view of FIG. 1 as viewed from the right. The description of the observation method is included in the following description of the observation unit.

1 is a casing, 2 is an underwater television camera,
3 is a light source and 4 is a hose joint. Casing 1
Is open at the lower end to become the observation port 11, and the upper end is
And a connection portion 12. The underwater television camera 2 is provided in the casing 1, and its optical axis 21 is directed to the observation port 11. The light source 3 is provided in the casing 1.
In addition, the rod 13 may be hung down from the lower end of the casing 1, an attachment 14 may be provided, a light source 15 may be provided on the attachment 13, and a shielding plate 16 for preventing direct exposure to the underwater television camera 2 may be provided. Therefore, since the light source includes one or both of the light sources 3 and 15, the light source is disposed with respect to the casing.

The hose joint 4 is for connecting to a conduit 6 for fresh water. The hose joint 4 is disposed on the outer surface of the side wall 17 of the casing 1 with the inner end of the axis 41 directed downward of the underwater television camera 2.

In this observation part, the casing 1 is connected to the suspension pipe 5, and the conduit 6 is connected to the hose joint 4, and is suspended in the hole. Turn on the light source 3 and turn on the underwater TV camera 2
Inspecting the bottom of the hole, the inner wall of the screen, casing, pile, etc., and observing the situation with a monitor on the ground.

When the water is cloudy and the image on the monitor is unclear or not displayed, fresh water is fed into the conduit 6. Fresh water flows from the hose joint 4 below the underwater television camera 2 to dilute or eliminate turbid water. Thus, imaging by the underwater television camera 2 becomes possible.

In the case of the second observation unit, the difference from the first observation unit is as follows. That is, the hose joint 4 ′ is attached to the outer surface of the observation tube 18 protruding from the side surface of the casing 1, and the inner end of the axis 41 ′ is horizontally arranged in the underwater television camera 2 ′.
At the point where the conduit 6 'branches off from the conduit 6 at the T-shaped joint 6 "and is connected to the hose joint 4'. The distal end of the observation tube 18 is opened and the observation port 11 is opened. Light sources 3 'are arranged above and below the underwater television camera 2'.

In this case, it is suitable for observing the inner wall surface of a screen, a casing, a pile or the like or the hole wall surface during digging. If the accumulated water is turbid and it is difficult or impossible to check with the underwater television camera 2 ', fresh water is sent to the conduits 6 to 6' and flows from the hose joint 4 'to the front of the underwater television camera 2'. Since the accumulated water loses the obstruction observing function, the underwater television camera 2 'can take an image.

In the drawing, reference numeral 31 denotes a motor, which is disposed in a frame portion constituting the connecting portion 12 as usual,
The underwater television camera 2 'is rotated on a horizontal plane, and 32 is a centralizer.

[0030]

According to the first observation method of the present invention, the bottom of the well bore, screen, casing,
Or, if the accumulated water is turbid, the fresh water can be easily and quickly diluted or eliminated by observing the inner surface of the pile, etc. Can be.

According to the second observation method of the present invention, the observation of the inner wall surface of the well screen, casing, or pile by the underwater television camera can be performed simply and quickly by sending fresh water even if the accumulated water is turbid. In addition, the observation inhibition function can be lost by diluting or eliminating the same, and observation can be performed correctly.

According to the first observation unit of the present invention, even if the accumulated water below the underwater television camera is turbid, clear water can be sent to the turbid water through a conduit, which can be used for dilution and elimination of the turbidity. .

According to the second observation section of the present invention, even if the accumulated water in front of the underwater television camera is turbid, fresh water can be sent to the turbid water through a conduit, which can be used for dilution and elimination of the turbidity. .

[Brief description of the drawings]

FIG. 1 is a side view showing a specific example of an observation unit used for performing a first observation method according to the present invention.

FIG. 2 is a bottom view.

FIG. 3 is a right side view of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Underwater television camera 2 'Underwater television camera 3 Light source 4 Hose joint 4' Hose joint 5 Hanging pipe 6 Conduit 11 Observation port 12 Connection part 15 Light source 17 Side wall 18 Observation cylinder 21 Optical axis 21 'Optical axis 41 Axis 41' Axis

Claims (4)

[Claims] When an underwater television camera (2) whose optical axis (21) is directed downward in a vertical direction is suspended in a well or a hollow pile to observe the inside thereof, the underwater television camera (2) is positioned below the underwater television camera (2). 2. An observation method using an underwater television camera (2), wherein clear water is fed into a substance that obstructs the observation to cause the obstruction function of the substance to be lost. 2. When an underwater television camera (2 ') whose optical axis (21') is oriented in a horizontal direction is suspended in a well or a hollow pile and the inner wall surface thereof is observed, the underwater television camera (2 ') is observed. ) An observation method using an underwater television camera (2 ′), characterized in that clear water is fed into a substance that is ahead of the substance and obstructs the observation so that the obstruction function of the substance is lost. 3. Injecting clear water into a substance that is below the underwater television camera (2) that points downward in the vertical direction and obstructs the observation, and observes the inside of the well or hollow pile by losing the obstruction function of the substance. The underwater television camera (2) is used for observation method.The casing (1), the underwater television camera (2), and the light source (3)
The casing (1) has an opening at the lower end, and an upper end of the casing (1) serves as a connection portion (12) with the suspension pipe (5), and the underwater television camera (4). 2) has its optical axis in the casing (1).
(21) is directed toward the observation port (11), and the light source (3) has its optical axis aligned with the optical axis (2) of the underwater television camera (2).
The hose joint (4) is connected to the fresh water conduit (6) and is provided on the outer surface of the side wall (17) of the casing (1) in parallel with the casing (1). Axis
An observing section, wherein the inner end of (41) is disposed to face downward from the underwater television camera (2). 4. An underwater television camera oriented in a horizontal direction.
(2 ') Used in an observation method with an underwater television camera (2') that feeds clear water into a substance that is ahead of and obstructs its observation and loses the inhibitory function of the substance and observes the inside of wells and hollow piles The casing (1), the underwater television camera (2 '), and the light source (3)
The casing (1) has an observation tube (18) protruding from the side, the tip of which is open, the observation port (11 ') and the upper end connected to the suspension pipe (5). Connection
(12), the underwater television camera (2 ') is disposed in the casing (1) with its optical axis (21') facing the observation port (11 '), and the light source (3) is The optical axis is the optical axis of the underwater TV camera (2 ')
The hose joint (4 ') is provided in parallel with (21') on the casing (1), and the hose joint (4 ') is for connecting to a conduit (6) for fresh water, and its axis is attached to the outer surface of the observation tube (18). An observing section, wherein the inner end of (41 ') is disposed facing the front of the underwater television camera (2').