JP3530651B2 - Maximum value storage type sensor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure material, a film material, or the like in various structures such as a ground structure such as a building, a bridge, a membrane structure, or a non-ground structure such as an aircraft or a ship. The present invention relates to a maximum value storage type sensor used for detecting the maximum deformation amount and the displacement amount corresponding to the maximum load applied to a member in the past. The data obtained by this maximum value storage type sensor is used for predictive diagnosis of the possibility of destruction of structures by nondestructively detecting strength changes caused by the time-dependent loading of external forces such as earthquakes on component members. It can be used for

[0002]

2. Description of the Related Art Japanese Patent Application No.
There are those proposed as No. 138977 and Japanese Patent Application No. 5-297609. These have a structure in which a plurality of conductive elements having an appropriate electric resistance value, such as carbon fiber, are connected in parallel between a pair of terminals while slightly varying the degree of slack of each, The conductive member is attached and used so that tension is applied to each of the conductive elements in accordance with the deformation or displacement of the constituent member to be detected.
Then, when tension is applied, the conductive elements with different degrees of slack are broken in order of increasing slack according to the degree of tension, and the result is the change in electrical resistance between both terminals or the accompanying voltage change. To detect as. In other words, the electrical resistance value between both terminals indicates which conductive element has broken, and it is possible to know the maximum value in deformation and displacement that has occurred in the component member depending on which conductive element has broken. It has become.

These maximum value storage type sensors can be used universally for various structures, can be expected to have considerably high detection accuracy, and have many advantages such as a simple structure. have. However, as a basis for this, slightly different slack is given to the conductive element, and the maximum amount of deformation is obtained by utilizing the difference in the degree of slack to cause sequential self-rupture according to the amount of deformation in the component to be detected. Because it uses the principle of detecting
It has the disadvantage that the stability of detection accuracy cannot always be sufficiently maintained. That is, in these maximum value storage type sensors, the setting of the degree of slack in each conductive element is an important factor in stabilizing the detection accuracy, and the variation in tensile strength of each conductive element affects the detection accuracy. It is easy, but it is relatively difficult to set a slightly different degree of slack in each conductive element, and therefore sequential breakage of each conductive element according to the amount of deformation in the constituent member to be detected does not necessarily occur reliably. In some cases, it is unexpectedly difficult to maintain the uniformity of the tensile strength of each conductive element, and the stability of detection accuracy cannot be sufficiently maintained.

Against this background, the applicant of the present application has proposed, as Japanese Patent Application No. 6-323236, a maximum value storage type sensor having a structure which enables more stable and high detection accuracy. One of the maximum value storage type sensors according to this proposal has the following structure. That is, while arranging a plurality of conductive elements each formed of a linear body having a predetermined electric resistance value in a side-by-side arrangement, a folded portion folded back at the intermediate portion is given to these conductive elements in a state of being aligned in a horizontal line,
And a conductor formed to form a circuit that causes a correlative change in resistance value in accordance with the sequential disconnection of each conductive element,
A cutting means capable of cutting the conductive element of the conductor at its folded portion, a slider for moving the cutting means relative to the conductor, and a watertight housing of the conductor, the cutting means and the slider. It has a structure including a protective case. Then, the slider is attached to the structural member to be detected in the structure so as to cause relative movement with respect to the electric conductor in accordance with deformation or displacement occurring in the structural member, and the electric conductor is used according to the movement amount of this relative movement. The conductive elements are sequentially cut by the cutting means, and the maximum deformation amount of the structural member of the structure is detected from the resistance value of the conductor in this cut state or the voltage value accompanying it.

According to this structure, basically, stable and high detection accuracy can be obtained, but there are insufficient points in terms of practical application requirements such as environmental resistance characteristics, productivity, and performance stability over time. is there. Therefore, the present invention proposes a more concrete improvement for the practical use of the maximum value storage type sensor as described above.

[0006]

The present invention first proposes an improvement in the structure of the slider for the maximum value storage type sensor as described above. Specifically, according to the present invention, the slider is formed by a slide block portion, a thin rod-shaped rod portion protruding from the slide block portion, and an engaging portion provided at the tip of the rod portion. . An insertion portion that communicates with the outside is provided at one end of the protective case, and the tip portion of the rod portion is projected through the insertion portion to the outside of the protective case.

With such a structure, the watertightness in the protective case can be enhanced, and the practicality can be enhanced under the condition of being exposed to wind and rain, for example. That is, in the maximum value storage type sensor having the above-mentioned structure, the slider is required to perform the movement operation across the inside and the outside of the protective case due to its function, and therefore, the external device for allowing the movement movement across the inside and outside of the slider. The protective case will be provided with a portion communicating with. This part is the greatest weakness in ensuring the watertightness in the protective case.However, as described above, the slider is provided with a thin rod-shaped rod portion, and the rod portion is used as a communicating portion in the protective case. By adopting a structure that allows passage, for example, the rod part can be formed into a round bar shape or a square bar shape, and a ring seal having a shape corresponding to the outer peripheral shape of the rod part can be used, ensuring watertightness in the communicating part. Therefore, the watertightness in the protective case can be ensured at a practical level.

Further, the present invention proposes an improvement in the movement of the slider of the maximum value storage type sensor as described above. Specifically, the rail part is provided in the protective case,
The rail portion regulates the movement trajectory of the slider. When the protective case is formed by casting aluminum, for example, the rail portion provided on the protective case is formed as a convex strip or a concave strip on the inner surface of the protective case as a casting mold. In order to give the slider the regulation of the movement locus by the rail portion, the slider is provided with an engaging portion corresponding to the rail portion, and the engaging portion is engaged with the rail portion.

By doing so, it is possible to eliminate a factor which adversely affects the detection accuracy of the movement of the slider, such as rattling or tilting, and as a result, the conductive element against the deformation or displacement of the constituent member to be detected. The cutting response characteristics can be improved, and the detection accuracy can be improved.

The present invention also proposes an improvement in the cutting means of the maximum value storage type sensor as described above. Specifically, the cutting means has a comb portion in which a plurality of comb teeth are formed and a blade portion is formed at the back end of the gap between the comb teeth, and the conductor is provided in the gap between the comb teeth in the comb portion. The basic structure is to cut the conductive element with the blade while receiving the conductive element in a unit of one. In addition to this, a structure in which each comb tooth becomes thin toward the tip Have

Such cutting means receives the conductive elements one by one in the gaps between the comb teeth to ensure the insulation of each conductive element and the accuracy of the sequential cutting of each conductive element. give. In addition, in order to exert such functionality, it is necessary to insert the conductive element into the space between the comb teeth at the time of assembly, but each comb tooth is formed so as to be thin toward the tip. That is, that is, by forming each comb tooth as a whole tapered, or by forming the tip part partially tapered, it becomes easier to perform the work of inserting the conductive element into the gap between the comb teeth, Therefore, the cause of damaging the conductive element during this operation can be substantially eliminated. The tapered structure of each comb tooth is
It also serves to help guide the conductive element to the cutting position.
As a result, the assembling workability, which is a large factor in terms of practicality, can be improved, and the performance can be improved by stabilizing the cutting position.

With respect to this problem, further improvement can be brought about by arranging the tips of the comb teeth to line up along a line that obliquely intersects the longitudinal direction of the comb teeth. That is, by doing so, the comb teeth are arranged in a so-called stepwise manner, that is, the lengths of the gaps between the comb teeth are sequentially shortened, and the conductive elements are inserted into the gaps between the comb teeth one by one. At this time, it is possible to insert one by one from a long gap. As a result, the work becomes easier and the cause of damaging the conductive elements can be further suppressed as compared with the case where all the conductive elements are simultaneously inserted into the gaps.

Further, the present invention proposes an improvement in the conductor of the maximum value storage type sensor as described above. Specifically, as a first proposal, a holding sheet formed by joining a pair of sheet materials each provided with an opening so that the openings are overlapped with each other is provided with a predetermined number of conductive elements in a horizontal line. The folded structure is held by a sandwich structure in which the folded-back portions are arranged so as to face the openings to form a conductor.

According to this first proposal, the sheet material is continuous over the entire conductor, and therefore, when the conductor is handled, a load such as pulling which causes cutting or damage to the conductive element is applied. It can effectively prevent giving. That is, it is possible to substantially eliminate the factor that causes a defect in the conductor during assembly or replacement of the conductor.

As a second proposal, a pair of sheet materials formed of non-thermoplastic resin and provided with electrode terminals for output from the conductive element on their joint surfaces are joined by using the thermoplastic resin as an adhesive. The holding sheet to be formed holds a predetermined number of conductive elements in a sandwich structure in which the conductive elements are in contact with the electrode terminals of each sheet material to form a conductor.

According to the second proposal, since the joining using the thermoplastic resin as the adhesive is performed by heating under the pressure condition, the contact between the electrode terminals of both sheet materials and the conductive element is high. This is done by pressure, and the stability of electrical contact between the electrode terminal and the conductive element can be enhanced. Further, according to the second proposal, the electrode terminals provided on each of the pair of sheet members come into contact with the conductive element from both sides, and the resistance with respect to the electrical contact between the conductive element and the electrode terminal is further reduced. You can also That is, it is generally preferable to use carbon fiber as the conductive element, but when forming the conductive element with carbon fiber, for example, several tens to 100 pieces are bundled into one conductive element. It will be. In this case, a part of the carbon fiber comes into indirect contact with the electrode terminal via another carbon fiber. Therefore, when the electrode terminals are contacted with the conductive element from both sides as in the second proposal, the number of carbon fibers indirectly contacting the electrode terminals can be reduced, and the electrical contact between the conductive element and the electrode terminals can be reduced. The resistance can be made smaller. As a result, the detection accuracy can be improved.

Regarding the electric conductor formed as in each of the above-mentioned proposals, the holding sheet is provided with the engaging portion, and the protective case is provided with the engaging receiving portion, so that when the electric conductor is incorporated into the protective case, the holding sheet is provided. The electric conductor can be positioned in the protective case by engaging the engaging portion of the item with the engaging portion of the protective case. With this configuration, the conductor can be easily and accurately positioned within the protective case, and the stability of the performance can be improved as well as the assembling property, which is a large factor in practical use.

Furthermore, the present invention proposes an improvement in the protection case of the maximum value storage type sensor as described above. Specifically, in order to give the protective case an electromagnetic interference preventing function, the protective case is made of a metal material. In order to form such a protective case with high accuracy and light weight, aluminum is used as a metal material to form the protective case by casting.

[0019]

FIG. 1 shows an exploded state of a maximum value storage type sensor according to a preferred embodiment of the present invention. As shown in FIG. 1, the maximum value storage type sensor according to this embodiment has two conductors 2a and 2b having substantially the same structure inside a protective case 1, a printed circuit board 3 to which they are connected, and It has a structure in which the comb-shaped cutter 4 and the slider 5 which are cutting means are incorporated.

The protective case 1 is composed of a protective case body 10 made of aluminum casting formed in a flat rectangular box shape, a cover 11 made of aluminum casting which covers the protective case body 10, and a watertight seal packing 12 interposed therebetween. . An insertion portion 13 is provided on one end side of the protective case body 10, and a ring seal portion 14 is also provided on the seal packing 12 correspondingly. As shown in FIG. 2, the ring seal portion 14 has a structure that seals the outer periphery of a rod portion 15 of the slider 5 described later in an O-ring-like manner. In addition, in the protective case body 10,
Two pairs of semi-cylindrical bosses 17 as left and right pairs are provided on the inner side surface as locking receiving portions, and two rail portions 18 are provided on the bottom surface with a convex structure (FIG. 3).

As shown in FIG. 8 which shows the disassembled and assembled state of the conductors 2a, 2b, a holding sheet 19 is made to hold a predetermined number of conductive elements 20, 20 ,. Form. Each conductive element is formed by bundling several tens to 100 carbon fibers in a bundle,
It is formed to have a resistance value of about 1 mm. The holding sheet 19 is formed by sticking a base sheet 21 and a cover sheet 22 each made of a heat-resistant polyimide resin with a thermoplastic polyimide resin, and at the time of this bonding,
The conductive elements 20, 20, ... Are sandwiched side by side. Square openings 23 of the same size are formed in both sheets 21 and 22.
So that they overlap. Then, as shown in FIG. 9, the openings 23p formed by the overlapping are folded back so that the center of the folding corresponds to the center line, and the conductive elements 20, 20, ... Are formed side by side in a line. Folding part 2
4 is made to face substantially the center of the opening 23p. Further, electrode terminals for output are formed on both sheets 21 and 22 by photo-etching similarly to the flexible printed circuit board. Specifically, as shown in FIG. 8, with respect to the base sheet 21, an electrode terminal including a contact portion 26c that crosses the base sheet 21 in the width direction and a conductive wire portion 26p that extends in the longitudinal direction of the base sheet 21. 26, and the cover sheet 22 is formed with the electrode terminal 27 in a state corresponding to the contact portion 26c of the base sheet 21. When the conductive elements 20, 20, ... Are sandwiched as described above, the contact portions 26c of the base sheet 21 and the electrode terminals 27 of the cover sheet 22 are electrically connected to the conductive elements 20, 20 ,. Contact with. Furthermore, the holding sheet 19 is provided with semicircular cutouts 28 for engaging portions at left and right sides at regular intervals.

The printed circuit board 3 is formed by providing printed wiring to form an electric circuit for outputting the outputs from the conductors 2a and 2b to the outside through the lead wire C.
The electric circuit has a structure as shown in FIG. 10, for example. Specifically, each conductor 2a, respective conductive elements 20, 20 2b, correction resistor R ₁ in parallel with ......,
Connect R ₂ . Also in the first output voltage path P _1, the temperature compensation resistor R ₃ for correcting the resistance characteristic change due to temperature of the conductive element connected to the second output voltage path P _2, the type of conductor A conductor labeling resistor R ₄ for marking is connected. Further, a third output voltage path P ₃ is branched from the second output voltage path P ₂ before the conductor marker resistance R ₄ , and a balance resistance R ₅ for the temperature correction resistance R ₃ is connected to this. The first output voltage path P ₁ and the third output voltage path P
E (= E ₂ −E ₁ ) in the state where a constant current is applied to ₃ by the constant current circuits T ₁ and T ₂ is set as the output voltage.

As shown in FIGS. 5 and 9, the comb-shaped cutter 4 is provided with a comb portion 30 having a width corresponding to the folded portion 24 of the conductive element facing the opening 23p of the conductor. The structure is such that the engaging recesses 31 (FIG. 4) are provided on the shoulders protruding on both sides. The comb portion 30 has a structure in which the comb teeth 32, 32, ... Are provided at intervals corresponding to the arrangement interval of the conductive elements 20, 20 ,. The blade portion 34 is formed on the. As shown in FIG. 6, each of the comb teeth 32 is formed in a tapered shape that becomes narrower from the base end toward the tip.
A line L that diagonally intersects the longitudinal ends of 32, ...
So that they can be lined up alongside (Fig. 5).

The slider 5 has a slide block portion 36.
And a thin rod-shaped rod portion 15 to be projected from this, and a connecting end 37 provided at the tip thereof. The slide block portion 36 is formed in a solid rectangular shape, and a brake mounting portion 38 is provided on each side surface of the slide block portion 36 so that the brake pad 39 can be mounted thereon. 40 (FIG. 4), and two engaging grooves 41 corresponding to the rail portion 18 of the protective case body 10 are further provided on the lower surface (FIG. 3). Rod part 1
5, the base end portion of the slide block portion 36 can be fitted and connected to the slide block portion 36, and the tip end portion thereof can be threaded so that the connection end 37 can be screwed and connected.

As for the conductors 2a and 2b, as shown in FIG. 7, the conductors 2a and 2b are folded back in the above-described manner, and the conductor 2b is attached to the conductor 2a. The support sheets are sandwiched and overlapped with each other, and the cutouts 28 of the respective holding sheets are fitted into the bosses 17 of the protective case body 10 so that they are fixedly positioned with respect to the protective case body 10. Further, the printed board 3 is also assembled by fitting the notch 38 formed on the side edge thereof into the boss 17. Similarly, the conductors 2a, 2 are formed by the spring plate 43 having the notch 42 that fits in the boss 17.
The overlapping portion of b and the printed circuit board 3 is pressed down. As a result, the conductors 2a and 2b and the printed circuit board 3 are connected so as to form the circuit as described above.

As shown in FIGS. 7 and 9, the comb cutter 4 is incorporated in a state of being sandwiched between the inner conductors 2a, and at that time, the conductive elements 20, 2 of the respective conductors 2a, 2b are incorporated.
0, ... are inserted one by one into the gap 33 between the comb teeth in the relationship as shown in FIG.

As for the slider 5, as shown in FIG. 4, the locking projection 40 of the slide block 36 is locked in the locking recess 31 of the comb cutter 4, and as shown in FIG. The engagement groove 41 of 36 is brought into a state of engaging with the rail portion 18 of the protective case body 10, and the distal end side of the rod portion 15 is further inserted into the insertion portion 1 of the protective case body 10.
3 and the connecting end 37 is connected there.

The maximum value storage type sensor as described above is used as shown in FIG. 11 in the case of detecting the deformation of the constituent members in the structure, for example. That is, the fixing hole 44 provided in the protective case 1 is used to fix the structure to be detected near one end of the component P of the structure, and the connecting end 37 of the slider is provided with a wire W having an appropriate length. connection,
The end of the wire W is fixed near the other end of the component P. The tension direction of the wire W is parallel to the main direction of deformation of the component P that is expected to occur. When the structural member P is deformed in this state, tension is applied to the wire W in response to the deformation, and as a result, the slider 5 moves, and the comb cutter 4 conducts each of the conductors 2a and 2b in accordance with the amount of movement. The sex elements 20, 20, ... Are sequentially cut. Then, in accordance with this, the above E becomes gradually smaller. Therefore, by measuring the voltage value regularly or at a necessary time, it is possible to know the degree of the maximum deformation amount of the deformation that has occurred in the past.

[0029]

As described above, according to the present invention, it is possible to enhance the practicality of the maximum value storage type sensor with respect to the environment resistance characteristics, productivity, performance stability and the like.

[Brief description of drawings]

FIG. 1 is an exploded view of a maximum value storage type sensor according to an embodiment.

FIG. 2 is a partial cross-sectional view showing the relationship between the insertion portion of the protective case and the rod portion.

FIG. 3 is a partial cross-sectional view showing a relationship between a protective case body and a slide block portion.

FIG. 4 is an explanatory diagram showing a relationship between a slide block portion and a comb cutter.

FIG. 5 is a plan view of the comb cutter shown together with the relationship with the conductive elements.

FIG. 6 is an explanatory view of the shape of comb teeth together with the outer peripheral shape of each part.

FIG. 7 is an explanatory diagram showing a relationship between both conductors and a printed circuit board.

FIG. 8 is an exploded view of a conductor.

FIG. 9 is a perspective view showing a relationship between a folded conductor and a comb cutter.

FIG. 10 is an output circuit diagram from a conductor.

11 is an explanatory diagram of a usage example of the maximum value storage type sensor of FIG. 1. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Protective case 21 Sheet material 2a Conductor 22 Sheet material 2b Conductor 23 Opening part 4 Cutting means 24 Folding part 5 Slider 28 Notch (locking part) 13 Insertion part 30 Comb part 15 Rod part 32 Comb tooth 17 Boss (locking) Receiving part) 33 Gap 18 Rail part 34 Blade part 19 Holding sheet 36 Slide block part 20 Conductive element 37 Connection end

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI G01N 3/06 G01N 27/00 L 27/00 G01B 7/18 Z (72) Inventor Hirokazu Nakasone Maruko-cho, Ogata-gun, Nagano Prefecture Mitakedo 2480 Nagano Keiki Seisakusho Maruko Plant (72) Inventor Yoichi Kobayashi Maruko-cho, Ogata-gun, Nagano Mitakedo 2480 Nagano Keiki Seisakusho Maruko Plant (56) Reference JP-A-7-128156 (JP, A) JP-A-6-331581 (JP, A) JP-A-7-55741 (JP, A) Actual development Sho 61-163972 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01L 1/00 G01L 7/00 G01N 3/06 G01N 27/00

Claims (7)

(57) [Claims] 1. A state in which a plurality of conductive elements each formed of a linear body having a predetermined electric resistance value are arranged side by side, and a folded portion formed by folding the conductive elements at an intermediate portion is arranged in a horizontal line. And a conductor formed so as to form a circuit that causes a correlative change in resistance value according to the sequential disconnection of each conductive element, and the conductive element of this conductor can be cut at its folded portion. The cutting means, the slider for moving the cutting means relative to the conductor, and the protective case for accommodating the conductor, the cutting means and the slider in a watertight manner. The slider is attached to the slider so as to cause relative movement with respect to the conductor in accordance with the deformation of the conductor, and the conductivity of the conductor depends on the amount of the relative movement. Sequentially cut the elements with cutting means,
A maximum value storage type sensor for detecting the maximum deformation amount of a structural member of a structure from the resistance value of a conductor in this disconnected state, the slider being a slide block part and the slide block part. It is formed by a rod-shaped rod part protruding from the end and a connecting end provided at the tip of this rod part, and an insertion part communicating with the outside is provided at one end of the protective case, and the tip end side of the rod part is passed through this insertion part. A maximum value storage type sensor characterized in that it is projected outside the protective case. 2. A state in which a plurality of conductive elements each formed of a linear body having a predetermined electric resistance value are arranged side by side, and the folded-back portions folded back at the intermediate portion of these conductive elements are aligned in a horizontal line. And a conductor formed so as to form a circuit that causes a correlative change in resistance value according to the sequential disconnection of each conductive element, and the conductive element of this conductor can be cut at its folded portion. The cutting means, the slider for moving the cutting means relative to the conductor, and the protective case for accommodating the conductor, the cutting means and the slider in a watertight manner. The slider is attached to the slider so as to cause relative movement with respect to the conductor in accordance with the deformation of the conductor, and the conductivity of the conductor depends on the amount of the relative movement. Sequentially cut the elements with cutting means,
A maximum value storage type sensor for detecting the maximum deformation amount of a structural member of a structure from the resistance value of a conductor in this disconnected state, wherein a rail portion is provided in a protective case, and a slider is provided by the rail portion. A maximum value storage type sensor characterized in that the movement locus of the sensor is regulated. 3. A state in which a plurality of conductive elements each formed of a linear body having a predetermined electric resistance value are arranged side by side, and the turn-back portions of the conductive elements that are folded back in the middle are aligned in a horizontal line. And a conductor formed so as to form a circuit that causes a correlative change in resistance value according to the sequential disconnection of each conductive element, and the conductive element of this conductor can be cut at its folded portion. The cutting means, the slider for moving the cutting means relative to the conductor, and the protective case for accommodating the conductor, the cutting means and the slider in a watertight manner. The slider is attached to the slider so as to cause relative movement with respect to the conductor in accordance with the deformation of the conductor, and the conductivity of the conductor depends on the amount of the relative movement. Sequentially cut the elements with cutting means,
A maximum value storage type sensor configured to detect the maximum deformation amount of a structural member of a structure from the resistance value of a conductor in this cut state, wherein the cutting means forms a plurality of comb teeth and There is a comb portion in which a blade portion is formed at the inner end of the gap between the comb teeth, and one conductive element of a conductor is received in the gap between the comb teeth in the comb portion, and the conductive portion is formed by the blade portion. A maximum value storage type sensor characterized in that the element is cut, and each comb tooth of the element is tapered toward the tip. 4. The maximum value storage type sensor according to claim 3, wherein the tips of the comb teeth are arranged along a line diagonally intersecting the longitudinal direction of the comb teeth. 5. A state in which a plurality of conductive elements each formed of a linear body having a predetermined electric resistance value are arranged side by side, and the turn-back portions of the conductive elements that are folded back in the middle are aligned in a horizontal line. And a conductor formed so as to form a circuit that causes a correlative change in resistance value according to the sequential disconnection of each conductive element, and the conductive element of this conductor can be cut at its folded portion. The cutting means, the slider for moving the cutting means relative to the conductor, and the protective case for accommodating the conductor, the cutting means and the slider in a watertight manner. The slider is attached to the slider so as to cause relative movement with respect to the conductor in accordance with the deformation of the conductor, and the conductivity of the conductor depends on the amount of the relative movement. Sequentially cut the elements with cutting means,
A maximum value memory type sensor configured to detect the maximum amount of deformation in a structural member of a structure from the resistance value of a conductor in this cut state, and a pair of sheet materials provided with openings, respectively. A holding sheet formed by joining the openings so that the openings overlap with each other, and holding a predetermined number of conductive elements in a sandwich structure in which the folded portions arranged side by side in the horizontal direction face the openings to form a conductor. The maximum value storage type sensor characterized in that 6. A state in which a plurality of conductive elements each formed of a linear body having a predetermined electric resistance value are arranged side by side, and the turn-back portions of the conductive elements that are folded back in the middle are aligned in a horizontal line. And a conductor formed so as to form a circuit that causes a correlative change in resistance value according to the sequential disconnection of each conductive element, and the conductive element of this conductor can be cut at its folded portion. The cutting means, the slider for moving the cutting means relative to the conductor, and the protective case for accommodating the conductor, the cutting means and the slider in a watertight manner. The slider is attached to the slider so as to cause relative movement with respect to the conductor in accordance with the deformation of the conductor, and the conductivity of the conductor depends on the amount of the relative movement. Sequentially cut the elements with cutting means,
A maximum value memory type sensor configured to detect the maximum amount of deformation in a structural member of a structure from the resistance value of a conductor in this cut state, which is formed of a non-thermoplastic resin and is made of a conductive element. A holding sheet formed by joining a pair of sheet materials provided with output electrode terminals on their joint surfaces by using a thermoplastic resin as an adhesive, and providing a predetermined number of conductive elements with these conductive elements being electrodes of each sheet material. A maximum value memory type sensor characterized in that a conductor is formed by holding it in a sandwich structure so as to come into contact with a terminal. 7. The retaining sheet is provided with an engaging portion, the protective case is provided with an engaging portion, and the engaging portion of the retaining sheet is used as an engaging portion of the protective case when the conductor is incorporated into the protective case. The maximum value storage type sensor according to claim 5, wherein the electric conductor is positioned in the protective case by being locked.