JP3329029B2 - Intelligent structural members - Google Patents

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 and accurately grasping a damaged portion and a damaged area of a structure damaged by an earthquake, a fire or the like.

[0002]

2. Description of the Related Art Generally, when reusing a structure damaged or destroyed by an earthquake, a fire, or the like, it is required to quickly and accurately specify a damaged portion and a damage range.

[0003] Conventionally, from the viewpoint of danger prediction, a technology for performing a danger prediction using an intelligent material combining carbon fiber and glass fiber, and a technology for pasting an optical fiber to concrete to predict the occurrence of cracks are known. .

[0004] In the former, for example, glass fiber and carbon fiber are mixed in 8 pieces.
If it is hardened with plastic at a ratio of one to one and used as a substitute for concrete reinforcing steel, the electric resistance increases before it breaks due to the pulling force and it can be predicted in advance, that is, it is a kind of intelligent material that issues an alarm by yourself It is.

The latter is based on the principle of crack detection, in which an optical fiber is attached to concrete as a sensor for health monitoring, and cracks generated and grown on the concrete surface cut the optical fiber attached to the concrete. It is.

[0006]

However, when reusing a structure damaged or destroyed by an earthquake, fire, or the like, a request to quickly find a necessary part for correction and reinforcement is required. The intelligent material combining carbon fiber and glass fiber or the method of sticking an optical fiber to the concrete surface to detect the occurrence of cracks does not help. In other words, all of the conventional methods can grasp the presence of damage to the concrete member, but cannot specify the damaged portion and the damage range, and do not have a sufficient diagnostic function after the disaster.

It is an object of the present invention to solve the above-mentioned 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, an intelligent structural member of the present invention encloses a reactant made of a liquid or gas which reacts with air or moisture to emit light, heat or color, in an enclosure. Thus, a sensor is constructed, and the sensor is arranged inside a concrete structural member (claim 1). In this case, the sensor can be constituted by connecting a number of beads in an enclosure enclosing the reactant (claim 2).

Another aspect of the intelligent structural member of the present invention is to encapsulate a reactant composed of a liquid or gas which reacts with air or moisture to emit light, generate heat or color, and form a large number of such capsules in a two-dimensional manner. To form a sheet-shaped sensor, and the sheet-shaped sensor is arranged on the surface of the concrete structural member.

[0010]

According to the first and second aspects of the present invention, a sensor (a material containing light or heat, or a liquid or a gas to be colored) is inserted into a concrete structural member. The sensor is attached to the surface. For this reason, when the structure is damaged or destroyed by external force or temperature, such changes in the environment may damage or destroy the sensor, leak the enclosed liquid or gas, or cause visual changes such as coloring. Therefore, it is possible to accurately judge the structural safety after the disaster, that is, whether the damaged structure can be reused.
Further, cracks in concrete of important structures such as facilities for nuclear power generation can be detected at an early stage.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

The intelligent structural member 1 shown in FIG.
Comprises a rod-shaped sensor body 4 previously installed at the same embedding depth as a concrete reinforcing bar 3 inside a concrete beam 2 as a structural member for constructing a concrete structure.

The rod-shaped sensor body 4 is formed by enclosing a reactant 5 made of a liquid or a gas which reacts with air or moisture to emit light, generate heat or color, etc., 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 enclosure 6 is selected from materials whose tensile strength and melting temperature are close to the descending strength of the reinforcing bar of the reinforcing bar 3 and the allowable temperature.

When a 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 an external force or temperature, the structural member 1 is damaged or destroyed. At the location, the surrounding body 6 is damaged or broken, and the reactant 5 such as a sealed liquid or gas leaks and reacts with air or moisture, and a visual change such as coloring is observed. Therefore, by checking the colored portion and the like, it is possible to easily specify the location where the structural member 1 is damaged or destroyed. Therefore, upon reuse, the damaged portion and damaged area of the structural member can be immediately and accurately grasped, and cracks can be detected early.

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

The intelligent structural member 1 shown in FIG. 3 is an embodiment in which a sheet sensor 8 is attached to the outside of a concrete plate 7. This sheet-shaped sensor 8 is shown in FIG.
As shown in FIG. 4B, a reactant 5 such as a liquid or a gas which reacts with air or moisture and emits light, generates heat or is colored, that is, has a sensor function, as shown in FIG. And many are two-dimensionally arranged to form a sheet. Since the structural member is sensitive to damage or destruction over a two-dimensional range, cracks in concrete such as a nuclear power plant facility structure can be detected at an early stage.

[0017]

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

1) According to the first aspect, when there is an environmental change such as an external force or a temperature due to an earthquake or a fire, the surface layer of the sensor disposed inside the concrete structural member is damaged or destroyed. Liquid that was torn at
Leakage of gas and the like gives visual changes such as coloring. For this reason, it is possible to quickly and accurately determine the structural safety of the damaged structure caused by the earthquake or the fire after the damage, and to detect cracks in the concrete of important structures such as facilities for nuclear power generation at an early stage.

2) According to the second aspect, since the sensor is composed of a plurality of enclosures in which the reactants are enclosed, the sensor is made of a plurality of beads, so that the surface layer of the sensor is damaged or destroyed, and visual change such as coloring is caused. The parts to be applied are clearly distinguished from the parts that do not change in color or the like because they are not damaged.

(3) In the third aspect, a sheet-like sensor is attached to the outer surface of the concrete structural member. This is because a large number of capsules enclosing a reactant are two-dimensionally arranged. When a structure is damaged or destroyed due to external force or temperature, the damage or breakage of the sensor due to such environmental changes appears two-dimensionally as visual change such as coloring and two-dimensionally specified. it can. For this reason, it is possible to accurately determine the structural safety after the disaster, that is, whether the damaged structure can be reused.
Further, cracks in concrete of important structures such as facilities for nuclear power generation can be detected at an early stage.

[Brief description of the drawings]

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

FIG. 2 is a view showing a rod-shaped sensor used in FIG. 1;

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

FIG. 4 is an explanatory diagram of a sheet-like sensor used in FIG. 3,
(A) is a perspective view of the sheet-like sensor, and (b) is a cross-sectional view of a portion A thereof.

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-1-134219 (JP, A) JP-A-1-114740 (JP, A) JP-A-63-169542 (JP, A) JP-A-63-169542 204142 (JP, A) Real opening 58-159572 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01K 11/12 G01K 11/20 G01N 21/88-21/91 G01N 33/38 E04G 23/02

Claims (3)

(57) [Claims] 1. A sensor is formed by enclosing a reactant made of a liquid or gas which reacts with air or moisture, emits light, generates heat or colors, etc. in an enclosure, and arranges the sensor inside a concrete structural member. Characterized intelligent structural members. 2. An intelligent structural member according to claim 1, wherein said sensor is formed by connecting a plurality of beads in an enclosure enclosing a reactant. 3. A sheet-like sensor is formed by encapsulating a reactant made of a liquid or gas which reacts with air or moisture and emits light, generates heat or colors, and arranges a large number of such capsules two-dimensionally. An intelligent structural member, wherein the sheet-shaped sensor is disposed on a surface of a concrete structural member.