JP2002340805A - Measuring method of damaged part of concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that manual input by inputting by tracing a cracked spot on a photograph acquired by photographing a damaged spot, or by tracing into the crack on a digital photograph generates an artificial error or inefficiency of a work. SOLUTION: This method is characterized by applying white marking along the damaged spot on the surface of this concrete structure, spraying a water- holding agent onto the surface of the concrete structure, photographing the surface, inputting the photographed image into a computer by a scanner, converting inputted raster data into vector data, and executing damage measurement of the vector data by CAD function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for measuring a damaged portion generated on the surface of a concrete structure such as a concrete bridge structure.

[0002]

2. Description of the Related Art Existing concrete structures, for example, concrete slabs of bridges, are damaged over time by weathering, an increase in traffic, and an increase in the size of vehicles, such as cracks. When the damage is remarkable, replacement is usually performed. However, damage such as cracks on the surface is usually repaired or reinforced.

In repair and reinforcement, accurate information on the damaged portion is required, and measurement of the damaged portion is indispensable.

Although a considerable number of methods for measuring a damaged portion have been proposed so far, most of them have been enlarged by enlarging an image of a damaged portion on the surface of a concrete structure photographed in advance so as to detect a damaged portion such as a crack. This is input to a computer by tracing input on a digitizer (Japanese Patent No. 2542889) or by tracing a damaged portion such as a crack on a digital photograph.

[0005] Although these measurement methods can be evaluated individually, they involve manual input, and therefore, there is a possibility that an artificial error may occur by the input person, and it is troublesome and time-consuming.

[0006] In addition, a laser measuring device (Patent No. 31)
No. 42182) and measurement using an infrared camera have been proposed, but the former has a large laser antenna and thus has a limited range of use. I need.

[0007]

An object of the present invention is to manually input a cracked portion of a photograph of the above-mentioned damaged portion by tracing a cracked portion on a digitizer or by tracing a cracked portion on a digital photograph. It is intended to solve the problems of errors and work inefficiencies.

As a method for solving the problems of human error and inefficiency in work due to manual input, it is conceivable to first input a photographed image of a concrete structure without tracing it. However, it is almost impossible to directly detect a crack or the like from an input image as it is because there is much noise such as dirt.

Therefore, the present invention solves the above problem by means described below.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention applies white markings along a damaged portion on the surface of a concrete structure and sprays a water retention agent on the surface of the concrete structure. Take a photo of this surface, input the captured image to a computer with a scanner, convert the input raster data into vector data, paste this vector data on a CAD, and measure the damaged part with the CAD function The present invention provides a method for measuring a damaged portion of a concrete structure.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings.

In a portion 1 of a concrete structure having cracks 2 on its surface shown in FIG.
A marking 3 is made along with the white chalk as shown in FIG. 4 is noise such as dirt attached to the surface. After the marking, an aqueous solution containing a water retention agent is sprayed on the surface of the concrete. As shown in FIG. 3, the contrast between white and black can be enhanced by wetting the location of the marking 3 and the concrete surface. In FIG.
The marking 3 appears white, and in FIG. 3, the marking 3 appears white, and the surface of the concrete 1 appears black.

The marking material and the water retention agent are not particularly limited as long as they can enhance the contrast between white and black, respectively. As a marking material, a chalk made of calcium carbonate and gypsum calcium, particularly a wax type is preferred. White chalk made of gypsum calcium containing a fluorescent pigment is also preferred. An inexpensive glycerin aqueous solution can be used as the water retention agent.

After the white markings 3 are applied along the cracks 2 and the water retention agent is sprayed, a portion 1 of the concrete structure having the cracks 2 is photographed.

The above operation is performed when there are a plurality of portions of the concrete structure in which the cracks 2 have occurred, when a wide range is present, or for each portion as necessary.

The photographed image is input to a computer by a scanner. Pictures can be silver halide or digital. Then, the input raster data is converted into vector data as shown in FIG. 4 and pasted on a CAD as shown in FIG. 5, and a developed view 5 of a concrete structure having cracks 2 on the surface is created. Adjust the relative value by enlarging or reducing the relative value of the actual image. 4 and 5,
The same reference numerals shown in FIGS. 1, 2 and 3 are used for the concrete parts and cracks which have been digitized for convenience.

Next, the length of a crack, the area of a junker, and the like are measured using the CAD function.

[0018]

Since the present invention has been made as described above,
It has the following effects.

Since the damaged portion on the surface of the concrete structure is marked white with a marking material and a water retention agent is sprayed on the surface, the concrete surface can enhance the contrast between black and white.

Therefore, since the image of the concrete surface can be directly input to the computer, there is no need to input the image shot on a digitizer or to trace cracks on a digital photograph as before. Thus, it is possible to eliminate human error and inefficiency in work due to manual input.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a portion of a concrete structure where a crack has occurred.

FIG. 2 is an explanatory view showing markings along cracks.

FIG. 3 is an explanatory view in which a water retention agent is sprayed on a concrete surface in FIG. 2;

FIG. 4 is a schematic diagram showing displayed vector data.

FIG. 5 is a schematic view showing a crack development view displayed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 The part of the structure where the crack 2 occurred on the surface 2 Crack 3 Marking 4 Noise 5 Development view

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D059 AA14 GG39 2F065 AA21 AA49 AA58 BB27 CC00 DD06 DD09 FF04 TT07 2G051 AA90 CB05 DA15 EA12 FA03 5B057 AA01 BA02 CA12 CA16 CG06 DA01

Claims (1)

[Claims] 1. A white marking is provided along a damaged portion of a surface of a concrete structure, and a water retention agent is sprayed on the surface of the concrete structure, and a photograph of the surface is taken. Input to the computer, convert the input raster data into vector data, paste this vector data on the CAD,
A method for measuring a damaged portion of a concrete structure, wherein a damaged portion is measured by a CAD function.