JPS63238507A - Crack measurement method - Google Patents

Abstract

PURPOSE:To measure a projection and a recess continuously and accurately without contacting by moving a traveling carriage where a noncontact displacement gauge is mounted along a surface to be measured and measuring the movement distance of the carriage from the rotational quantity of wheels while measuring the projection and recess. CONSTITUTION:The traveling carriage 1 where the noncontact displacement gauge 2 which projects a laser beam 5 stopped down narrowly and detects the distance from its reflected light is mounted is moved along the surface of a concrete structure 6 to be measured which is the body to be measured, and the noncontact displacement gauge 2 measures the projection and recess of the surface of the concrete structure 6. Simultaneously, a rotary encoder 4 measures the rotational quantity of the wheels 3 of the traveling carriage 1 to calculate the movement distance of the traveling carriage along he surface of the concrete structure 6. Then measurement data obtained by the displacement gauge 2 and rotary encoder 4 are drawn on a plotter to obtain a cracking development elevation 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for measuring cracks in a one-note structure.

(Prior Art) Conventionally, when measuring the width of a crack in a concrete structure, a ruler called a crank scale is used to read the crack width with the naked eye.

(Problems to be Solved by the Invention) The conventional method described above is not efficient and has poor accuracy, and in addition, it is expensive to survey the entire large area. Furthermore, although the width of the crack can be measured, the depth cannot be determined.

Furthermore, a fatal drawback of the conventional method is that the results are influenced by the subjectivity of the measurer. For this reason, the measurement results are not recorded as objective data, and there is no evidence that the measurements were actually taken.

(Means for Solving the Problems) The present invention relates to a crack measuring method proposed in view of the above-mentioned circumstances. While moving along the measured surface, the unevenness of the surface to be measured is measured by the non-contact displacement meter, and at the same time, the amount of rotation of the wheels of the trolley is measured to calculate the total distance traveled by the traveling trolley along the surface to be measured. , which solves the above problems.

(Function) As described above, in the present invention, a traveling cart equipped with a non-contact displacement meter is made to travel along the surface to be measured of an object to be measured, and while the traveling truck is moving, the displacement meter is used to measure the object. At the same time as measuring irregularities represented by cracks, etc. on the measurement surface, measuring the amount of rotation of the wheels of the traveling trolley, calculating the travel distance of the traveling trolley along the measured surface, and combining both measurement data. This method continuously measures irregularities such as cracks on the surface of the object to be measured in a non-contact manner.

(Example) The present invention will be described below with reference to the illustrated embodiments.

(1) is a traveling trolley with a non-contact displacement meter (2) and wheels (3)
A rotary encoder (4) for detecting the rotation angle is mounted.

In the illustrated embodiment, as a non-contact displacement meter, a narrow, narrow laser beam (5) is projected onto the surface to be measured, and the distance to the surface to be measured is detected from the reflected light returning from the same surface. A laser displacement meter configured as follows is used.

As described above, the non-contact displacement meter (2) is moved along the surface to be measured of the concrete structure (6), which is a fixed object, and 2), the unevenness of the surface of the concrete structure (6) is determined by 61+1, and at the same time, the rotary encoder (4) measures the amount of rotation of the wheels (3) of the traveling trolley (1). The moving distance of the traveling trolley along the surface of
(See figure) Figures 2 to 4 show all application examples of the method of the present invention.
As shown in the figure, when the concrete structure to be measured (6) has a curved shape, the crack development diagram ( 8) is obtained.

As is clear from the foregoing, this method is applicable to the traveling trolley (I
By measuring the relative distance between the non-contact displacement meter (2) on J and the surface to be measured, the unevenness of the same surface is determined. If the radius of the wheels of the bogie (11) is significantly smaller than that of the bogie (11), a guide rail (91t) is laid on the surface of the concrete structure (6) as shown in Figure 3, and the vehicle runs on the same rail (9). Scan with trolley (1).

Next, if you want to find the crack occurrence pattern over the entire inspection surface, rather than just measuring the width and depth of a crack on a single line on the surface of a concrete structure, dotted line 0Q in Figure 4. As shown, the target concrete structure (6) is scanned at regular intervals in all directions parallel to the surface.

The data thus obtained is outputted to a plotter in the form shown in FIG. 5, and only the cracked portion 0υ is extracted as shown in FIG.

The overall pattern of cracks is thus obtained.

Figure 7 shows the entire crack measuring device used in this method.
The overall size has been reduced to suit on-site measurements, and the output of the traveling trolley txt is connected to the interface αi.
The data is taken in by the hand belt microcomputer (131) and output to the plotter (14) to be plotted.

Further, the measurement data can also be stored in a floppy αQ.

(Effects of the Invention) According to the present invention, while moving a traveling cart equipped with a non-contact displacement meter along a fixed surface, the displacement meter detects cracks on the same surface. At the same time as measuring the unevenness, the total amount of rotation of the wheels of the trolley is measured, and the moving distance of the trolley along the surface to be measured is measured, and based on the measurement data, cracks on the surface to be measured are represented. It is a textured metal that can be used to continuously and non-contact measure the graininess.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the implementation status of one embodiment of the crack measuring method according to the present invention, FIGS. 2 and 3 are explanatory diagrams showing other embodiments of the method of the present invention, and FIGS. FIG. 6 is an explanatory diagram showing the process of extracting cracks and A-turns, and FIG. 7 is a perspective view of the crack measuring device used in the method of the present invention. (IJ... Traveling bogie (2)... Non-contact displacement meter (3)... Wheels (41... Rotary encoder (6)... Concrete structure Figure 2

Claims (1)

[Claims] While moving a traveling trolley equipped with a non-contact displacement meter along the surface to be measured of the object to be measured, the unevenness of the surface to be measured is measured by the non-contact displacement meter, and at the same time, the amount of rotation of the wheels of the trolley is measured. A crack measuring method characterized by measuring and calculating the travel distance of a traveling trolley along the surface to be measured, and continuously measuring irregularities of the surface to be measured without contact along the travel path of the traveling trolley. .