JP2001041903A - Method and apparatus for inspecting civil engineering works, structure and geology - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject method and apparatus capable of observing the soil or state in the ground for a real time only by boring an investigation hole with a small diameter in the ground or a structure. SOLUTION: In a method for inspecting civil engineering works, a structure and geology, a microscope is inserted in the hole with a diameter of 10 mm or less bored in the ground or a structure to directly observe the cross section of the hole or the state of a hole bottom at the base end of the microscope by the naked eye or to observe the same by a monitor using the camera provided in the base end of the microscope. The apparatus adapted to this inspection method is equipped with the microscope 1 comprising an optical fiber bundle inserted in the hole bored in the ground or the structure, a light source 2 for passing light for illuminating the hole through a part of the optical fiber bundle of the microscope 1, the camera 4 provided in the base end part of the microscope 1 and the monitor 7 for projecting the image taken by the camera 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for inspecting civil engineering, structures and geology by drilling a hole in the ground or a structure and directly observing the state of the hole cross section or the hole bottom.

[0002]

2. Description of the Related Art Japanese Patent No. 268
Conventionally, as introduced in the specification of Japanese Patent No. 173, a method of boring the ground, cutting a part of the ground into a bar shape with a sampler and analyzing the ground, and a method of piercing the ground and inserting a camera into the hole to perform camera analysis. There was a method of directly observing the image of the above.

In recent years, accidents have frequently occurred in which walls of concrete buildings and tunnels constructed in an incomplete form during the high-growth period are peeled off, and countermeasures are required. In order to prevent such accidents beforehand, it is necessary to investigate in advance the presence or absence of cracks in concrete and other structures, and the size and direction of the cracks. It takes a primitive way of searching.

[0004]

However, the former ground analysis method using a sampler cannot monitor cracks, spring water, etc. in real time because of the geology at the time of sampling. In the latter method of directly observing with a camera, a boring operation is required because a large-diameter hole for inserting the camera into the ground must be formed. Furthermore, the method of hitting a concrete wall with a hammer and making a judgment based on the sound has a problem that an objective investigation cannot be performed, depending on the experience and skill of the worker.

[0005] Therefore, the problem to be solved by the present invention is:
An object of the present invention is to provide a civil engineering / structure / geological inspection method and apparatus capable of observing soil quality and conditions in the ground in real time simply by drilling a small-diameter investigation hole in the ground or a structure.

[0006]

Means for Solving the Problems To solve the above problems, a method for inspecting civil engineering, structures and geology according to the present invention comprises making a hole in a ground or a structure with a diameter of 10 mm or less, and inserting a microscope into the hole. The state of the hole cross section and the bottom of the hole is directly observed with the naked eye at the base end of the microscope or observed on a monitor using a camera provided at the base end of the microscope,
Inspection is performed.

Further, the civil / structure / geological inspection apparatus of the present invention comprises a microscope comprising an optical fiber bundle inserted into a hole drilled in the ground and a structure, and a hole in a part of the optical fiber bundle of the microscope. A light source that transmits light for illuminating the microscope, a camera provided at a base end of the microscope, and a monitor that displays an image captured by the camera. This apparatus automatically diagnoses the state of a hole by providing means for performing image processing on an image captured by a camera and diagnosing means for diagnosing the state of the hole based on the image-processed image information. be able to.

[0008]

Embodiments of the present invention will be described below. FIG. 1 is a block diagram showing an embodiment of the present invention, wherein 1 is a microscope having an optical fiber,
2 is a light source for emitting light for illuminating the hole from the tip of the microscope 1, 3 is an eyepiece provided at the base end of the microscope 1, 4 is a CCD camera, 5 is a camera amplifier, 6 is a video recorder. , 7 is a monitor TV,
8 is a printer, 9 is an image processing device, 10 is a modem, 11
Is a remote diagnostic system, and 12 is a memory storing a diagnostic support function.

In the present invention, from the image on the display of the monitor TV 7 observed by the microscope 1,
Underground void volume, rate, cracks, formation characteristics, soil particle composition,
By organizing information such as spring water and expressing it as numerical values, it is possible to determine the mechanical properties of the soil more accurately than a soil test using a sample. It can also determine cracks, size, direction, and the success or failure of concrete or other structures.

[0010]

Embodiments of the present invention will be described below. In the present embodiment, a high-performance camera amplifier (shutter speed 1/50 to 1 / 2,000,000 seconds) which is balanced so as to maximize the performance of the microscope 1
5 and the xenon light source 2 realized high inspection capability.

[0011] To catch clear information by simple operation and work. While excavating a hole with a diameter of 10mm to 15mm and a depth of 5m and cleaning the inside of the hole, excavation depth of 10cm to 30c
An endoscope is inserted every m and the subject is directly viewed. The light source is outside,
The endoscope is made of an optical fiber and allows a clear image to be magnified and viewed. From the images on the display, the size, depth, continuity, deterioration state of concrete, etc. of cracks and voids are analyzed. Immediately after the analysis, the necessary adhesive, injection agent, and the like are injected using the small holes.

The following are useful as applications: 1) Discovery of cracks in tunnels and concrete joints. 2) Find cracks in any structure. 3) Understand the growth of the plant root system and the distribution of fertilizer in the ground. 4) Confirmation of injection results in injection notice. 5) Other information such as the presence of groundwater in the ground and the amount of voids.

In order to conduct the above investigation, if an extremely fine endoscope is used, an inspection hole of only 10 mm to 15 mm is opened, and an endoscope having a diameter of 1 mm to 8 mm is inserted into the inspection hole. Cases can be found directly.

Using a medical ultrafine endoscope and an outer diameter of 8 mm, the ground, the voids in the structure, spring water, cracks, the improvement effect by injection, etc. are directly viewed and judged. Since the outer diameter of the endoscope is 8 mm, an unnecessary large inspection hole is not required, and a borehole tube is inserted. The tip of the endoscope and the fiberscope are protected because they touch earth and sand and concrete. Since the inside of the excavation hole is small in diameter, it can be cleaned by blowing air to see it in a natural state.

In the present embodiment, not only the development of an ultra-fine optical fiber but also the fate of a conventional endoscope image is performed by applying the most advanced technology in the medical endoscope field requiring a high technology. We succeeded in removing the mesh of the image, and realized higher resolution. It also strongly supports ultra-fine spatial inspections that human eyes cannot reach, and enables clear image recording by connecting to related equipment. In addition, the camera is separated from the eyepiece, achieving high operability and reducing weight.

[0016]

As described above, according to the present invention, the ground or structure is perforated with a diameter of 10 mm or less, and the state of the bottom of the hole is directly viewed using a medical ultrafine endoscope (diameter 8 mm). By examining the amount of voids and the generation and direction of cracks, it is possible to directly look at the voids and the openings and directions of the cracks, which could only be determined by a sample, so that a more accurate determination can be made.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

1 microscope, 2 light sources, 3 eyepieces, 4
CCD camera, 5 camera amplifier, 6 video recorder, 7 monitor TV, 8 printer, 9 image processing device, 10 modem, 11 remote diagnostic system, 12
Memory with diagnostic support function

Claims (3)

[Claims] 1. A hole having a diameter of 10 mm or less is pierced in the ground or structure, and a microscope is inserted into the hole, and the state of the hole cross section or the hole bottom is directly viewed with the naked eye at the base end of the microscope or the microscope. A method for inspecting civil engineering, structures, and geology, wherein the inspection is performed by using a camera provided at a base end of the monitor and observing with a monitor. 2. A microscope comprising an optical fiber bundle inserted into a hole drilled in the ground or structure, a light source for passing light for illuminating a hole in a part of the optical fiber bundle of the microscope, and A civil engineering / structure / geological inspection apparatus comprising: a camera provided at a base end of a microscope; and a monitor for displaying an image captured by the camera. 3. The civil engineering equipment according to claim 2, further comprising: means for performing image processing on an image captured by the camera; and diagnosing means for diagnosing a hole state based on the image-processed image information.・ Structure / geological inspection equipment.