JP3295203B2 - Structure destruction detection alarm device and structure destruction detection alarm method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a destruction detection alarm system for a structure and a destruction detection alarm system for a structure, and more particularly to a method for detecting the destruction of a wall when applied to a wall of a structure. The present invention relates to a structure destruction detection alarm device for detecting and alarming, and a structure destruction detection alarm method.

[0002]

2. Description of the Related Art As is well known, an alarm device for an intruder, for example, to a CD (cash dispenser) corner, a large safe, a store, or the like has already become widespread. This known alarm device, for example, attaches a contact type or non-contact type sensor to an opening / closing unit such as a door or a window, and based on a signal from the sensor when the opening / closing unit is opened during a time period when the opening / closing unit is not originally opened / closed. In general, a computer is programmed to generate an alarm.

[0003]

However, in recent years,
Since it is common knowledge that the above-mentioned alarm device is installed in buildings that store valuables, there are many malicious examples of intruders destroying the walls of those buildings and invading them. . However, in the above-described conventional alarm device, as described above, since an abnormal opening of only the opening / closing portion of a structure such as a door or a window is detected, the wall of the structure is destroyed. There is a problem that it is not possible to cope with intrusion.

The present invention has been made in view of the above circumstances, and is particularly applied to a wall or the like of a structure to detect a destruction of the wall by an intruder or to completely destroy the wall. It is an object of the present invention to provide a structure destruction detection alarm device and a structure destruction detection alarm method that can prevent an intruder from entering a building.

Another object of the present invention is to make the destruction detection means constituting the destruction detection and warning device for a structure also function as a reinforcing material at a place where the destruction detection means is provided.

[0006]

According to a first aspect of the present invention, there is provided a destruction detection / warning apparatus for a structure, wherein continuous conductive fibers are provided integrally with a plastic material inside a lattice made of a plastic material. And a destruction detecting means provided with current-carrying terminals exposed to the outside of the lattice body at both ends of the conductive fiber; and supplying a current to the conductive fiber via the current-carrying terminal, It is provided with an energization and power detection means for detecting a change in the electrical characteristics of the fiber, and an alarm device for detecting destruction of the destruction detection means based on a detection result by the energization and power detection means and issuing an alarm. .

According to a second aspect of the present invention, there is provided a destruction detection / warning apparatus for a structural body, wherein conductive fibers are provided integrally with the plastic material in a plurality of predetermined sections inside a lattice made of a plastic material. The one end of the conductive fiber provided in the above and the one end of the conductive fiber provided in another section are connected by a conductive wire, so that the conductive fiber provided in each section forms one conductive path. A destruction detecting means, which is formed so as to be further provided with conducting terminals exposed to the outside of the lattice body at both ends of the conductive path;
Energizing and detecting means for passing a current through the conductive path including the conductive fiber through the conducting terminal and detecting a change in electrical characteristics of the conductive path, and a detection result by the energizing and detecting means And an alarm device for detecting the destruction of the destruction detecting means on the basis of the alarm and issuing an alarm.

According to a third aspect of the present invention, in the destruction detection / alarm apparatus for a structure according to the first or second aspect, the conductive fibers of the destruction detecting means are connected to each other by the conductive fibers themselves. Are arranged inside the lattice so as not to intersect.

According to a fourth aspect of the present invention, there is provided the structure destruction detection / alarm apparatus according to any one of the first to third aspects, wherein the conductive fibers are carbon fibers. I have.

According to a fifth aspect of the present invention, there is provided a structure destruction detection / warning apparatus according to any one of the first to fourth aspects, wherein the destruction detection means includes: It is characterized by having reinforcing non-conductive fibers having a higher elongation than the conductive fibers.

According to a sixth aspect of the present invention, there is provided the structure destruction detection / alarm apparatus according to any one of the first to fifth aspects, wherein the lattice member of the destruction detecting means is provided with the lattice member. Is provided integrally with the lattice body.

According to a seventh aspect of the present invention, in the method for detecting and alarming the destruction of a structure, continuous conductive fibers are provided integrally with the plastic material inside a grid made of a plastic material, and both ends of the conductive fibers are provided. A destruction detecting means, which is provided with a current-carrying terminal exposed on the outer surface of the lattice body, is attached or buried in a part of the structure for which destruction is to be detected. Along with passing a current through the conducting terminal, the electrical characteristics of the conductive fiber are measured over time, and based on the measurement result, it is detected that the structure has been destroyed and an alarm is issued. Features.

According to a eighth aspect of the present invention, there is provided a method for detecting and alarming the destruction of a structure, wherein conductive fibers are provided integrally with the plastic material in a plurality of predetermined sections inside a lattice made of a plastic material, and provided in one section. When one end of the conductive fiber is connected to one end of the conductive fiber provided in another section by a conductive wire, the conductive fiber provided in each section forms one conductive path. Made
Further, a destruction detecting means, which is provided at each end of the conductive path with a current-carrying terminal exposed to the outside of the lattice body, is attached or buried in a part of the structure to be detected for destruction. A current is applied to the conductive fiber through the terminals for both currents, and the electrical characteristics of the conductive fiber are measured over time, and it is detected that the structure has been destroyed based on the measurement result. It is characterized by issuing an alert.

[0014]

According to the first aspect of the present invention, a current is supplied to the conductive fiber from the power supply and power detection means, and its electrical characteristics (resistance, etc.) are measured. When the lattice is destroyed, the conductive fibers inside the lattice are broken. When the conductive fiber breaks, the energization and detection means detects a significant change in the electrical characteristics, and an alarm is issued by the alarm means.

According to the second aspect of the present invention, one conductive path is formed by the conductive fibers contained in the lattice body and the conductive wires connecting the conductive fibers. The destruction detection means of the destruction detection alarm device of the present invention may have such a configuration.

According to the third aspect of the present invention, since no intersection is formed in the conductive fiber, it is possible to eliminate the need for performing insulation treatment of the intersection, and it is possible to easily form one conductive path.

According to the fourth aspect of the present invention, a highly versatile device can be constructed by using carbon fibers as the conductive fibers.

According to the fifth aspect of the present invention, even after the carbon fiber breaks, the reinforcing non-conductive fiber does not break and the grid body is reinforced.

According to the sixth aspect of the present invention, the lattice body is further reinforced by the reinforcing material, and the fracture detecting means has a higher reinforcing function.

[0020] In the invention according to claim 7, when the destruction detecting means is destroyed, or when the conductive fiber built in the destruction detecting means is broken, the portion of the structure where the destruction detecting means is attached is changed. Destruction is detected and an alert is issued.

According to the eighth aspect of the present invention, one conductive path is formed by the conductive fibers built in the lattice body and the conductive wires connecting the conductive fibers. Other operations are the same as those of the seventh aspect.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an example of a structure destruction detection alarm device according to the present invention. This structure destruction detection and alarm device (hereinafter, abbreviated as “destruction detection and alarm device”) 1
Is a grid-like destruction detection means 10, an energization and power detection means 20 for supplying a current to the destruction detection means 10 and measuring its electric characteristics, and an energization and power detection means 20.
Alarm device 40 that issues an alarm based on the detection result of
And is provided. In this embodiment, an arithmetic processing unit (microcomputer) 30 for judging the detection result by the energization and power detection means 20 and activating the alarm device 40 includes the energization and power detection means 20 and the alarm device. 40. Reference numeral 21 denotes wiring for electrically connecting the energization and power detection means and the destruction detection means.

The destruction detecting means 10 will be described with reference to FIGS. 2 and 3 show the destruction detecting means according to one embodiment. This destruction detecting means 10
A forms the lattice body 11 as a whole as shown in FIG. As an example, the dimensions of each lattice forming the lattice body 11 are 15 cm × 20 cm, and the overall dimensions of one lattice body are 2 m × 3 m. Of course, this dimension is not limited to this.

The lattice body 11 is made of a plastic material, and has continuous carbon fibers 13 '(conductive fibers 1) inside the lattice body 11 as shown in FIG.
3) is provided integrally with the plastic material constituting the lattice body. In this embodiment, the carbon fibers 13
A large number of continuous warps are formed into a bundle and the lattice 1
It is buried in 1.

In this embodiment, the conductive fibers 13
Carbon fiber 13 'is used as the conductive fiber, but the conductive fiber in the present invention may be a fibrous material other than carbon fiber (for example, silicon carbide fiber) as long as it has good conductivity. Good.

As shown in FIG. 3, the carbon fibers 13 'are arranged in a continuous state so as to cover the entire area (wide range) of the lattice body without intersecting with each other. In order to satisfy this requirement, the one shown in FIG.
The carbon fibers 13 'are arranged in a meandering state.

Although not shown in FIG. 3, the grid body 11 in the present embodiment is provided in the plastic material constituting the grid body 11 in addition to the carbon fibers 13 '. Glass fiber 14 'for reinforcing the body 11
(Reinforcement non-conductive fibers 14) are provided integrally with the plastic material (FIG. 2). However, unlike the carbon fiber 13 ', the glass fiber 14'
Are arranged all over the inside (that is, in a lattice shape) to reinforce the entire lattice body.

Although the glass fiber 14 'is used as the reinforcing non-conductive fiber 14 in this embodiment as described above, the reinforcing non-conductive fiber 14 in the present invention is relatively tough and the conductive fiber 13 A fiber body other than glass fiber (for example, aramid fiber, vinylon fiber, polyamide fiber, polypropylene fiber, etc.) may be used as long as it has a higher elongation rate and is non-conductive. By the way, the carbon fiber 1
The ultimate elongation value (elongation at break) of 3 'is 0.8% to 1.5%.
%, The ultimate elongation value (elongation at break) of the glass fiber is about 2.5%.

Further, both ends of the carbon fiber 13 'are exposed to the outside of the lattice body 11, and the exposed portions are provided with terminals (current terminals) 1 for supplying electricity to the carbon fiber 13'.
5, 15 are provided. Then, as shown in FIG. 1, each of the wires 21,
One end of 21 is connected to these two terminals 15,15.

Next, the operation of the destruction detection / alarm device 1 having the above-described configuration will be described with reference to FIG. 4 showing an example of an actual use state of the device.

FIG. 4 shows an example in which the present apparatus is applied to an outer wall 51 of a building 50 such as a bank provided with a CD device (cash dispenser) inside. In FIG. 4, reference numeral 70 denotes a CD device installed inside the building, and 53 denotes a partition wall 5.
A passage 55 at the back of the CD device via 4 is a gate to the passage. In the passage 53, the staff member
It is for supplying and removing cash at 0. In this case, the outer wall 51, the partition wall 54, and the floor slab 56 constituting the building 50 are made of RC, reference numeral 57 is concrete, and reference numeral 58 is a reinforcing bar buried in the concrete.

In this embodiment, the destruction detection means 10 of the destruction detection alarm device 1 is buried inside the outer wall 51. In the example shown in FIG.
The outer wall 51 is buried approximately in the center of the thickness from the position of the floor slab 56 to a position slightly higher than the height of the passage gate 55. Although the lateral length of the destruction detecting means 10 is not shown in the figure, it is needless to say that the CD device 7 is not required.
It is desirable to install so as to cover as wide a range as possible with the installation location of 0 as the center.

Then, from the destruction detecting means 10A embedded in the outer wall 51, as shown schematically in FIG.
Wirings 21 and 21 leading to the energizing and detecting means 20 are connected. The carbon fiber 1 of this destruction detecting means 10A
3 'includes the energizing and detecting means 20 as shown in FIG.
The current from is supplied. Energizing and detecting means 20
Further measures its electric resistance over time (continuously or at regular intervals). Also, its electric resistance value is
It is constantly monitored by the arithmetic processing unit 30.

Now, an intruder destroys the outer wall from the outer wall 51 to aim for cash in the CD device 70 and
Suppose you try to get inside 3. The intruder first touches the outer wall 5
The concrete on the outer surface 51a and the reinforcing bar 58 inside the outer surface 51a are crushed using a shaving tool, a cutting tool, and the like, and the outer wall 51 is eventually broken down to a position where the breakage detecting means 10 is buried. Then, an intruder who finds the lattice-shaped destruction detection means 10 cuts or destroys the destruction detection means 10.

As described above, since the destruction detecting means 10 is composed of only the plastic material and the extremely fine fibers integrally disposed therein, the destruction detecting means 10 is destroyed by an intruder. Is done.

The destruction of the destruction detection means 10 is determined by the carbon fiber 13 '(conductive fiber 1) of the destruction detection means.
3) means breaking. When the carbon fiber 13 'is broken, the electric resistance value in the energizing and detecting means 20 changes greatly (theoretically, the electric resistance value becomes infinite). It is read by the arithmetic processing unit 30, and the arithmetic processing unit 30 sends an activation signal to the alarm device 40. This informs that the destruction detecting means 10 has been destroyed, that is, that the outer wall 51 has been destroyed or damaged.

As described above, according to the destruction detection / warning apparatus 1, knowing the presence of an intruder who attempts to break and invade a structure, the intrusion into the structure or damage due to the intrusion is prevented. It can be prevented beforehand and certainly.

The above-mentioned destruction detection / warning apparatus 1 is a security system which has already provided the arithmetic processing unit 30 and the warning apparatus 40, that is, a security system for detecting and alarming the abnormal opening / closing of doors and windows. Of course, it is also possible to integrate with a well-known security system by combining with the arithmetic processing unit and the alarm device constituting the above.

In the above embodiment, the electric resistance value of the carbon fiber 13 'incorporated in the destruction detecting means 10 is measured by the energizing and detecting means 20.
It is needless to say that the measurement symmetry is not the electric resistance value but other electric characteristics such as current.

FIGS. 5 to 7 show the destruction detecting means 10.
14 shows another embodiment in which A is attached to a wall of a building. In these figures, the same components as those shown in FIG. 4 are denoted by the same reference numerals.

FIG. 5 shows the destruction detecting means 1.
In this example, the staple 59A is attached to the inner surface 51b of the outer wall 51 with a staple 59. FIG. 6 shows an example in which the destruction detecting means 10 is attached to the inner surface 51b of the outer wall 51 with an adhesive (not shown).
Spraying a finishing material 60 on the inner surface 51b to which
It is finished so that the destruction detection means cannot be seen.

The structure shown in FIGS. 5 and 6 can also provide the same function and effect as that shown in FIG.

FIG. 7 shows an example in which the outer wall is thin. In this case, no reinforcing bar is provided in the concrete 57 forming the outer wall 52. The destruction detecting means 10A is buried inside the outer wall 52 at a position closer to the inner surface than the center of the wall thickness.

In FIG. 7, reference numeral 12 denotes a lattice body provided inside the outer wall 51 and closer to the outer wall 52a than the center of the wall thickness. The lattice body 12 is composed of a plastic material forming a lattice and fibers incorporated therein, similarly to the lattice body 11 constituting the destruction detection means 10, but includes conductive fibers such as the carbon fibers. Instead, only non-conductive reinforcing fibers such as glass fibers are incorporated (not shown).

In the structure shown in FIG. 7, the destruction detecting means 10A and the grid 12
Functions as a reinforcing member for the concrete 57. That is, in this case, the destruction detection means 10 exhibits both a function as a destruction detector and a reinforcing function. Although the destruction detecting means 10A exerts a reinforcing function also in the structure shown in FIGS. 4 to 6, in the case of the structure of FIG. The reinforcing effect becomes more remarkable.

The operation based on the structure shown in FIG. 7 will be further described. Since a reinforcing bar is not buried in the outer wall 52, a breaker (an intruder) of the outer wall 52 can be used.
May be destroyed by means such as hitting. In such a case, the destruction detecting means 10A is not easily cut as in the case of using a cutting machine. However, the carbon fiber 13 'built in the destruction detecting means 10A
Because the elongation is small, when the plastic lattice 11 constituting the destruction detecting means is subjected to relatively large deformation, the lattice 11 is broken before the lattice 11 is broken.
Therefore, when the destruction detecting means 10 receives the destructive force due to the deformation, the carbon fiber 13 'is cut before the destruction detecting means 10 itself is cut, and an alarm is issued at that time. It is possible to

In the fracture detecting means 10A according to the present embodiment, even if the carbon fiber 13 'is cut in this way, the glass fiber 14' having a larger elongation than the carbon fiber 13 'and being not broken has a lattice. It is possible to reinforce the body, prevent the breakage detecting means 10 from easily breaking, and issue an alarm, while retaining the reinforcing function of concrete.

FIGS. 8 to 11 show other examples of the structure of the destruction detecting means according to the present invention. 8 is an example in which the arrangement of the built-in conductive fibers 13 is changed from that shown in FIG. As described above, the conductive fibers 13 are connected (electrically continuous) from one terminal 15 to the other terminal 15 so that the conductive fibers 13 do not intersect and cover the grid body 11 as widely as possible. Since it is to be built in the body 11, the conductive fibers 13 may be provided as shown in FIG.

In the destruction detecting means 10C shown in FIG. 9, the conductive fibers 13 are incorporated only in predetermined sections of the lattice body 11 (only the vertical stripes of the lattice body 11 in the illustrated example), and are incorporated in these prescribed sections. In this example, the ends of the conductive fibers 13 are connected to each other by a conductive wire 16, thereby forming one conductive path between both terminals.

The destruction detection means 10D shown in FIG. 10 realizes destruction detection in a particularly wide area, and includes a plurality of destruction detection means having a certain size (for example, the destruction detection means as shown in FIG. 3). 10d, by connecting the terminals of each of the destruction detection means with a conducting wire, the conductive fibers 13 incorporated in each of the destruction detection means are electrically connected to each other to form one conductive path from the terminal 15A to the terminal 15F. ing.

In the destruction detection alarm device 1 provided with the destruction detection means 10D, the conductive fiber 1
If any one of the conductive paths formed by the conductors 3 and 16 is broken, an alarm is issued.

In the destruction detecting means 10E shown in FIG. 11, a piano wire (reinforcing material) 80 is provided integrally with the lattice body 11. In this case, the piano wire 80 is provided so as to be parallel to a vertical line constituting the lattice 11 on one surface of the lattice 11 and to be parallel to a horizontal line constituting the lattice on the other surface. ing. Although not shown, the lattice body 11 has conductive fibers and reinforcing non-conductive fibers built therein.

When the destruction detection means 10E is configured as described above, the destruction detection means 10 has a higher reinforcing function. In the above example, the piano wire 8
Although 0 is provided so as to be parallel to the grid formed by the grid body 11, the piano wire 80 may be provided so as to be oblique to the grid formed by the grid body 11. Further, in the embodiment, the piano wire is used as the reinforcing material. However, as the reinforcing material, other steel wires, wires made of other materials, and the like can be used in addition to the piano wire.

In this embodiment, an example is shown in which the present apparatus is applied to the detection of the destruction of a concrete wall of a structure. However, the destruction detection and alarm device for a structure and the destruction detection of the structure according to the present invention are shown. The warning method is not limited to the application only to the wall of the structure, and is not limited to the application only to the concrete structure. For example, in addition to walls, it can also be applied to floors or roofs,
Further, the present invention can be applied to a wooden or resin structure.

[0055]

As described above, according to the destruction detection / warning apparatus for a structure according to the present invention, the destruction detection means is attached or buried at the position where the destruction of the structure is to be detected, whereby the structure can be mounted. It is possible to know the existence of an intruder who is going to break and invade, and to prevent the intruder from invading the structure or to be damaged by the intrusion before and reliably.

Further, in particular, the structure of the destruction detecting means includes a non-conductive fiber for reinforcement in addition to the conductive fiber, so that the destruction detecting means is provided with the destruction detecting means. It will also function as a reinforcing material for the location.
For this reason, for example, when forming a thin concrete wall or the like, it is also possible to embed this destruction detection means in concrete instead of the reinforcing bar and to omit the reinforcing bar construction.

Further, when a steel wire is integrally provided on the lattice body constituting the destruction detection means, the destruction detection means has a higher reinforcing function, and is particularly suitable for a portion requiring high reinforcement. It is effective when used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a structural destruction detection / warning device according to the present invention.

FIG. 2 is a partial perspective view showing an example of a destruction detection means constituting the destruction detection and warning device for a structure according to the present invention.

FIG. 3 is a plan view showing another configuration example of the destruction detecting means.

FIG. 4 is a partial vertical sectional view of a structure, showing one mode of use of the structure destruction detection / warning device according to the present invention.

FIG. 5 is a partial elevational cross-sectional view of an outer wall of a structure, showing another mode of use of the structure destruction detection and warning device according to the present invention.

FIG. 6 is a partial vertical sectional view of an outer wall of a structure, showing another mode of use of the structural destruction detection and warning device according to the present invention.

FIG. 7 is a partial cross-sectional elevational view of an outer wall of a structure, showing still another use state of the structural destruction detection and warning device according to the present invention.

FIG. 8 is a plan view showing another configuration example of the destruction detection means.

FIG. 9 is a plan view showing still another configuration example of the destruction detection means.

FIG. 10 is a plan view showing still another configuration example of the destruction detection means.

FIG. 11 is a partial perspective view showing still another configuration example of the destruction detection means.

[Explanation of symbols]

1 Destruction detection alarm device for structures 10, 10A, 10B, 10C, 10d, 10D, 10
E Destruction detection means 11 Grid body 13 Conductive fiber 13 'Carbon fiber 14 Non-conductive fiber for reinforcement 14' Glass fiber 15, 15A, 15B, 15C, 15D, 15E, 15
F terminal (terminal for conduction) 16 Conductor 20 Conducting and detecting means 40 Alarm device 50 Structure (structure) 80 Piano wire (reinforcing material)

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Norio Mutoh 1-6-6 Moto-Akasaka, Minato-ku, Tokyo Inside Sogo Security Security Co., Ltd. (72) Inventor Chikako Saito 1-6-6-1 Moto-Akasaka, Minato-ku, Tokyo No. Sogo Security Security Co., Ltd. (72) Inventor Masahiro Usui 1-6-6 Moto-Akasaka, Minato-ku, Tokyo Sogo Security Security Co., Ltd. (72) Teruyuki Nakatsuji 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Kenzo Sekishima 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Yasushi Otsuka 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu (72) Inventor Minoru Sugita 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (56) References JP-A-62-147592 (JP, A) JP-A-3-164998 (J , A) JitsuHiraku Akira 63-5589 (JP, U) (58 ) investigated the field (Int.Cl. ^7, DB name) G08B 13/22

Claims (8)

(57) [Claims] 1. A continuous conductive fiber is provided integrally with a plastic material inside a lattice body made of a plastic material, and a current-carrying terminal exposed to the outside of the lattice body is provided at both ends of the conductive fiber. A destruction detecting means provided; an energizing and detecting means for flowing a current to the conductive fiber via the energizing terminal and detecting a change in an electrical characteristic of the conductive fiber; An alarm device for detecting a destruction of the destruction detecting means based on a detection result by an electric means and issuing an alarm. 2. A conductive fiber is provided integrally with the plastic material in a predetermined plurality of sections inside a lattice body made of a plastic material, and one end of the conductive fiber provided in one section and another section are provided. The conductive fibers disposed in each section form one conductive path by being connected to one end of the provided conductive fiber by a conductive wire, and the grid is provided at both ends of the conductive path. A destruction detecting means provided with a current-carrying terminal exposed to the outside of the body; and a current flowing through the current-carrying path including the conductive fiber through the current-carrying terminal, and a change in electrical characteristics of the current-carrying path. And a warning device for detecting a destruction of the destruction detecting device based on a detection result by the conducting and power detecting device, and issuing an alarm. Dress Place. 3. The conductive fiber of the destruction detecting means,
The breakage detection / alarm apparatus for a structural body according to claim 1 or 2, wherein the conductive fibers themselves are disposed inside the lattice so as not to cross each other. 4. The breakage detection alarm for a structure according to claim 1, wherein the conductive fiber is a carbon fiber. 5. The fracture detecting means includes a reinforcing non-conductive fiber having a larger elongation rate than the conductive fiber inside the lattice body.
The destruction detection alarm device for a structure according to any one of the above. 6. The grid according to claim 1, wherein a reinforcing material for reinforcing the grid is provided integrally with the grid of the breakage detecting means. Destruction detection alarm for structures. 7. A continuous conductive fiber is provided integrally with a plastic material inside a lattice member made of a plastic material, and at both ends of the conductive fiber, a current-carrying terminal exposed on an outer surface of the lattice member is provided. A destruction detection means, which is attached to or buried in a part of the structure for which destruction is to be detected, and allows a current to flow through the conductive fibers of the destruction detection means through the two energizing terminals. A method for detecting and alarming the destruction of a structure, comprising: measuring electrical properties of the fiber over time; detecting that the structure has been destroyed based on the measurement result; and issuing an alarm. 8. A conductive fiber is provided integrally with said plastic material in a predetermined plurality of sections inside a lattice body made of plastic material, and one end of said conductive fiber provided in one section and another section are provided. The conductive fibers disposed in each section form one conductive path by being connected to one end of the provided conductive fiber by a conductive wire, and the grid is provided at both ends of the conductive path. Destruction detection means provided with a current-carrying terminal exposed outside the body,
Attached or buried in a part of the structure for which destruction is to be detected, and applying a current to the conductive fiber of the destruction detecting means through the two current-carrying terminals, and changing the electrical characteristics of the conductive fiber with time. A structurally destructive detection and warning method, comprising: detecting that the structure has been destroyed based on the measurement result; and issuing an alarm.