JPH09159638A - Crazing diagnosing device of concrete member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically diagnose crazing generated in a concrete member and to an alarm. SOLUTION: Concrete is placed on an outer wall 12 and two conductive wires 14 and 14a are buried when manufacturing it. Each one edge of the conductive wires 14 and 14a is connected to a solar cell 16 and at the same time each the other edge is connected to a liquid crystal alarm 18. Current generated by the solar cell 16 is carried via the conductive wires 14 and 14a, thus enabling the liquid crystal alarm 18 to show a normal state. Then, when at least one of the conductive wires 14 and 14a is disconnected, electrical resistance becomes limitlessly large and the liquid crystal alarm 18 indicates an abnormal state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for self-diagnosing cracks generated in concrete members.

[0002]

2. Description of the Related Art In recent years, many buildings such as buildings, highways, bridges, etc. are constructed as concrete structures. However, concrete structures may crack due to external forces such as earthquakes. is there. This crack has a significant adverse effect on the durability of the concrete building. Therefore, in a concrete building, it is necessary to regularly inspect the concrete members for cracks and repair them.

[0003]

However, in such conventional crack diagnosis of concrete members, since the inspector performed the inspection with the naked eye, it is inevitably limited to the crack inspection of the portion which is inspected by the inspector. I will end up. However, it is extremely difficult to perform inspections in the facilities of nuclear facilities where humans cannot enter, or in the deep part where the complex structure part of the building cannot be seen, and it is impossible to perform accurate diagnosis. There was a problem.

In view of the conventional problems, it is an object of the present invention to provide a crack diagnosing device for a concrete member which can automatically diagnose and warn a crack occurring in a concrete member.

[0005]

In order to achieve such an object, the present invention embeds a conductive wire in a concrete member which is cut by a crack generated in the concrete member or which is elongated with a reduction in its cross-sectional area. The conductive wire is connected in a state of being connected to both ends of the conductive wire, and a warning means for detecting a change in electric resistance is provided in the middle of the conductive wire.

According to the crack diagnosing device for concrete members of the present invention having the above-mentioned structure, when the crack occurs in the concrete member, the conductive wire embedded in the concrete member is cut or not cut. However, this conductive wire is stretched with a decrease in its cross-sectional area. When the conductive wire is cut or stretched in this way, the electric resistance value of the conductive wire changes, and this can be detected by the warning means to notify that the concrete member is cracked.

[0007]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic sectional view showing an embodiment of the crack diagnosing device for concrete member of the present invention.

That is, as shown in FIG. 1, the crack diagnosing device 10 of this embodiment is applied to concrete members of all concrete constructions, for example, concrete members constructed as walls, beams or columns of buildings, Particularly, in this embodiment, the outer wall 12 will be described as an example.

The outer wall 12 is provided with conductive wire rods 14 and 14a such as conductive fiber rods of all forms that can be used for wiring or the like in the step of casting concrete and manufacturing it. Book buried. The conductive wires 14 and 14a are routed over substantially the entire length of the outer wall 12 in the width direction so that even if any portion of the outer wall 12 is cracked, the crack can be effectively detected.

On the other hand, a solar cell 16 as a power source and a liquid crystal alarm 18 as a warning means are embedded outside the outer wall 12 at both ends in the width direction. Solar cell 1
The panel surface of 6 is exposed to the outside so that sunlight can be effectively received, and the liquid crystal alarm 18 has a structure for detecting a change in electric resistance value like an electric resistance meter. The display surface is exposed to the outside so that you can easily check the warning display.

One end of each of the conductive wires 14 and 14a is connected to the solar cell 16, and the other end of each is connected to the liquid crystal alarm 18. Then, the electric current generated in the solar cell 16 is applied to the conductive wire 1.
When the liquid crystal alarm 18 is energized with a normal resistance value through 4, 14a, the liquid crystal alarm 1
Reference numeral 8 indicates a normal state. On the other hand, when at least one of the conductive wires 14 and 14a is broken, the electric resistance value becomes infinite and the liquid crystal alarm 18
Indicates an abnormal state (for example, a mark is displayed).

Therefore, the crack diagnosing device 10 of the present embodiment.
Is the outer wall 1 at the wiring portion of the conductive wires 14 and 14a.
When a crack 20 occurs in the wire 2, the conductive wire 1
One or both of 4 and 14a are disconnected at the crack 20 portion, the current from the solar cell 16 is cut off, and an abnormal state is displayed on the liquid crystal alarm 18, whereby the crack 20 on the outer wall 12 can be easily detected and notified. it can.

Since the solar cell 16 is used as a power source in this embodiment, a sufficient current is not generated in the solar cell 16 when the amount of sunlight is extremely small such as at night or in rainy weather or cloudy weather. The crack diagnosing device 10 does not operate, but the crack 20 does not have to be detected at the same time as the occurrence, and it suffices to know when there is sufficient sunlight.

By the way, although the case where the solar cell 16 is used as the power source and is embedded in the outer wall 12 has been disclosed, the solar cell 16 may be installed outside without embedding in such a manner. Further, instead of using the solar cell 16 as a power source, an AC power source or a DC power source such as a battery can be used. In this case, the crack 20 can be constantly diagnosed regardless of sunlight.

Further, although the case where the conductive wires 14, 14a are broken by the cracks 20 is disclosed, the outer circumferences of the conductive wires 14, 14a are protected by the covering material so that the conductive wires 14 are cracked by the cracks 20. , 14a also has a structure in which it expands with a decrease in its cross-sectional area, it is possible to detect and notify the occurrence of the crack 20 by detecting the change in the electric resistance value by the warning means.

The crack diagnosing device 10 of this embodiment is
It goes without saying that the present invention can be applied not only to the outer wall 12 but also to other concrete members.

[0017]

As described above, in the crack diagnosing device for a concrete member of the present invention, when a crack occurs in the concrete member, the conductive wire embedded in the concrete member is cut or its cross-sectional area is reduced. Is extended with a decrease in When the electric resistance value changes when the conductive wire is cut or stretched in this way, the warning means can detect it and, by extension, the fact that a crack has occurred in the concrete member can be notified. Therefore, even if there is a crack that occurs in a portion that cannot be seen by the inspector, it is possible to know the crack easily and accurately, and it is possible to perform an early repair.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of a crack diagnosing device for a concrete member according to the present invention.

[Explanation of symbols]

 10 Crack Diagnostic Device 12 Outer Wall (Concrete Member) 14, 14a Conductive Wire 16 Solar Cell (Power Source) 18 Liquid Crystal Alarm (Warning Means) 20 Crack

Claims (1)

[Claims] 1. A concrete member, in which a conductive wire which is cut by a crack generated in the concrete member or which is extended with a decrease in its cross-sectional area is installed in a buried state, and both ends of the conductive wire are supplied with a power source. A crack diagnosing device for a concrete member, characterized in that a warning means for detecting a change in electric resistance value is provided in the middle of the conductive wire.