JPH07134071A - Intelligent structural member - Google Patents

Abstract

PURPOSE:To quickly and precisely recognize the damaged part and damaged extent of a disaster-stricken concrete structural member by arranging sensors each of which is constituted by enclosing a reactive material composed of such a liquid or gas that emits light, generate heat, or colors when the material reacts to air or water in an enclosing material in the concrete structural member. CONSTITUTION:A bar-like sensor body 4 is formed by serially tying in a row a large number of enclosing bodies 6 containing a reactive material 5 composed of such a liquid or gas that emits light, generates heat, or colors when the material 5 reacts to air or water. An intelligent structural member 1 is constituted by burying in advance sensor bodies 4 thus formed in a concrete beam 2 at the same depths as those of reinforcing bars 3. When the concrete structure using this member 1 is damaged or broken by earthquake or fire, the enclosing body 6 is broken at the damaged or broken part of the member 1 and the enclosed reactive material 5 leaks out and reacts to air or water, resulting in a visual change by coloring, etc. Therefore, the damaged or broken part and the damaged or broken extent of the member 1 can be easily specified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intelligent structural member capable of immediately grasping a damaged portion and a damaged area of a structure damaged by an earthquake or a fire.

[0002]

2. Description of the Related Art In general, when reusing a structure that has been damaged or destroyed by an earthquake, fire, or the like, it is required to quickly and accurately identify the damaged portion and the damaged area.

From the viewpoint of danger prediction, conventionally, there are known a technology for predicting a danger by using an intelligent material that is a combination of carbon fiber and glass fiber, and a technology for predicting the occurrence of cracks by attaching an optical fiber to concrete. .

The former is composed of glass fiber and carbon fiber, for example.
When it is hardened with plastic at a ratio of 1 and used in place of concrete rebar, electrical resistance increases before it breaks due to pulling force and it can be predicted in advance, that is, it becomes a kind of intelligent material that issues an alarm by itself. Is.

In the latter, the principle of crack detection is that an optical fiber is attached to concrete as a health monitoring sensor, and cracks generated and grown on the concrete surface cut the optical fiber attached to the concrete. Is.

[0006]

However, when reusing a structure that has been damaged or destroyed due to an earthquake or a fire, etc. It doesn't work with the intelligent materials that combine carbon fiber and glass fiber, and the method of sticking an optical fiber to the concrete surface and detecting the occurrence of cracks. That is, all of the conventional methods can detect the existence of damage to the concrete member, but cannot specify the damaged portion and the damaged area and do not have a sufficient post-disaster diagnosis function.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide an intelligent structural member capable of immediately and accurately grasping a damaged portion and a damaged area of a concrete structure damaged by an earthquake or a fire.

[0008]

In order to achieve the above object, the intelligent structural member of the present invention encloses, in an enclosure, a reactant made of liquid or gas which reacts with air or moisture to emit light, generate heat, or color. To form a sensor, and the sensor is arranged inside the concrete structural member (Claim 1). In this case, the sensor can be formed by connecting a plurality of enclosures enclosing the reaction body in a string (claim 2).

Another form of the intelligent structural member of the present invention is to enclose a reactant, which is a liquid or gas, which reacts with air or moisture and emits light, generates heat or colors, into a capsule, and a plurality of the capsules are two-dimensional. To form a sheet-like sensor, and the sheet-like sensor is arranged on the surface of the concrete structural member (claim 3).

[0010]

According to the first and second aspects of the invention, a sensor (a material containing a liquid or gas that emits light or heat or is colored) is inserted inside the concrete structural member, and the third aspect is outside the concrete structural member. A sensor is attached to the surface. Therefore, when the structure is damaged or destroyed by external force or temperature, the sensor may be damaged or destroyed by such environmental changes, the enclosed liquid or gas may leak, and visual changes such as coloring may be seen. Therefore, it is possible to accurately judge the structural safety after the disaster, that is, whether the damaged structure can be reused.
Further, it is possible to detect cracks in the concrete of important structures such as nuclear power generation facilities at an early stage.

[0011]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Intelligent structural member 1 shown in FIG.
Is a structural member for constructing a concrete structure, in which a rod-shaped sensor body 4 is installed in advance inside the concrete beam 2 at the same embedding depth as the reinforcing bar 3 of concrete.

The rod-shaped sensor body 4 is formed by enclosing a reaction body 5 made of a liquid or a gas which reacts with air or moisture and emits light, generates heat, or colors in an enclosure 6 and connects a large number of these in series. . The surface material of the rod-shaped sensor body 4, that is, the material of the envelope body 6 is selected from the materials whose tensile strength and melting temperature are close to the falling strength and allowable temperature of the reinforcing bar 3 of the reinforcing bar 3.

If the concrete structure using the intelligent structural member 1 is unfortunately damaged by an earthquake or a fire, and the structural member 1 is damaged or destroyed by external force or temperature, the concrete structure is damaged or destroyed. At the location, the enclosure 6 is damaged or destroyed, and the enclosed reactant 5 such as liquid or gas leaks and reacts with air or moisture, and a visual change such as coloring is observed. Therefore, by checking this colored portion or the like, it is possible to easily specify the location where the structural member 1 is damaged or destroyed. Therefore, when reused, it is possible to immediately and accurately grasp the damaged portion and damaged area of the structural member, and it is possible to detect cracks at an early stage.

As described above, the sensor body 4 in which the tensile strength and melting temperature of the surface material are approximated to the falling strength and allowable temperature of the reinforcing bar is previously arranged at the same embedding depth as the reinforcing bar 3 of concrete. This makes it possible to make an accurate judgment about the structural safety after the disaster, that is, whether the damaged structure can be reused. Further, it is possible to detect cracks in the concrete of important structures such as nuclear power generation facilities at an early stage.

The intelligent structural member 1 of FIG. 3 is an embodiment in which a sheet-shaped sensor 8 is attached to the outside of the concrete plate 7. This sheet-shaped sensor 8 is shown in FIG.
As shown in FIG. 4B, the reactant 5 such as liquid or gas that reacts with air or moisture to emit light, generate heat, or color, that is, have a sensor function is surrounded by the microcapsule 9 as shown in FIG. 4B. It is formed into a sheet by arranging a large number of these in a two-dimensional arrangement. Since it is sensitive to damage or destruction of structural members over a two-dimensional range, it is possible to detect cracks in concrete such as nuclear power generation facility structures at an early stage.

[0017]

In summary, according to the present invention, the following excellent effects can be obtained.

1) According to claim 1, when an environmental change such as an external force or a temperature occurs due to an earthquake or a fire, the surface layer of the sensor disposed inside the concrete structural member is damaged or destroyed. The liquid that was torn and sealed in,
Gas leaks and gives a visual change such as coloring. Therefore, it is possible to quickly and accurately determine the structural safety of a structure damaged by an earthquake or fire after the disaster, and to detect cracks in concrete of important structures such as nuclear power generation facilities at an early stage.

2) According to the second aspect of the invention, since the sensor is composed of a plurality of enclosures in which the reactants are encapsulated, the surface layer of the sensor is damaged or destroyed to cause a visual change such as coloring. The part to be given and the part which has not been changed such as being colored because it has not been damaged are clearly distinguished.

3) According to claim 3, a sheet-shaped sensor is attached to the outer surface of the concrete structural member, because a large number of capsules containing the reactants are two-dimensionally arranged. When a structure is damaged or destroyed by an external force or temperature, the location where the sensor is damaged or destroyed by such environmental changes appears two-dimensionally as a visual change such as coloring and is two-dimensionally specified. it can. Therefore, it is possible to accurately judge the structural safety after the disaster, that is, whether the damaged structure can be reused.
Further, it is possible to detect cracks in the concrete of important structures such as nuclear power generation facilities at an early stage.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an intelligent structural member of the present invention.

FIG. 2 is a diagram showing a rod-shaped sensor used in FIG.

FIG. 3 is a diagram showing another embodiment of the intelligent structural member of the present invention.

FIG. 4 is an explanatory view of the sheet-like sensor used in FIG.
(A) is a perspective view of a sheet-like sensor, (b) is a sectional view of the A portion.

[Explanation of symbols]

 1 Intelligent structural member 2 Concrete beam 3 Reinforcing bar 4 Bar-shaped sensor body 5 Reactor 6 Enclosure 7 Concrete plate 8 Sheet-like sensor 9 Microcapsule

Claims (3)

[Claims] 1. A sensor is constructed by enclosing a reaction material composed of a liquid or a gas which reacts with air or moisture and emits light, generates heat or colors in an enclosure, and the sensor is arranged inside a concrete structural member. The characteristic intelligent structural member. 2. The intelligent structural member according to claim 1, wherein the sensor is formed by connecting a plurality of enclosures enclosing a reactant in a beaded manner. 3. A sheet-like sensor is constructed by encapsulating a reaction material composed of a liquid or a gas which reacts with air or moisture and emits light, generates heat or colors, and arranges the capsules in a two-dimensional manner. An intelligent structural member, wherein the sheet-shaped sensor is arranged on the surface of the concrete structural member.