JP2018178586A - Electric power generation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the energy that can be extracted in an apparatus that generates electricity by attaching a piezoelectric element to a structure.SOLUTION: Deformation (strain) occurs in a brace 20 due to an external force of a relatively low frequency of 0.2 to 0.5 Hz in a state where the frame (main structure 10) comprising a pillar 11 and a beam 12 is integrated with the brace 20, then strain energy is reserved. When the strain is increased and the lock by the stopper 140 is released, the strain energy is converted into the vibration energy of the brace 120. The brace 120 vibrates at a relatively high frequency of, for example, 20 to 100 Hz when vibrating independently of the pole 11 and the beam 12. The vibrating brace 20 repetitively applies pressure to the piezoelectric element 150 at that frequency.SELECTED DRAWING: Figure 3

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a power generation structure, and more particularly to a power generation structure including a main structure provided with a pillar / beam structure, a seismic element attached thereto, and a power generation element.

  Various techniques for attaching power to a structure to generate power have been proposed (see, for example, Patent Documents 1 to 3). In the technology disclosed in Patent Document 1, a piezoelectric conversion element is directly inserted into a joint of a large structure, which is a large structure, to convert large vibrational energy applied to the structure into electricity.

  In the technology disclosed in Patent Document 2, as a means for converting vibrational energy into electrical energy, a piezoelectric element is attached to a vibrator and the vibrational energy of the vibrator is converted into electric power.

  On the other hand, in the technique disclosed in Patent Document 3, the vibrator is actively moved to release its displacement and vibrate, and power is generated by free vibration thereafter. For power generation, a technology for rotating a cam is used.

JP, 2005-90152, A Unexamined-Japanese-Patent No. 2006-71065 JP-A-7-49388

  FIG. 1 shows an example of the relationship between the frequency of the piezoelectric element and the power generation efficiency. The illustrated example shows the relationship between the frequency and the power generation efficiency when two types of forces, 10 kN and 20 kN, act. In any of the examples, the higher the frequency, the higher the power generation efficiency. For example, at a frequency of about 5 Hz, the power generation efficiency is one digit, but at a frequency of 15 Hz, the power generation efficiency improves to nearly 20%, and the power generation efficiency increases as the frequency further increases. That is, it is necessary to extract power from the piezoelectric element in a state where the frequency is as large as possible.

  The technique disclosed in Patent Document 1 has an advantage that electric power based on a large force can be taken out by directly inserting a piezoelectric element into a joint of a large structure, as described above, but on the other hand, a building structure There is a problem that it is difficult to increase the conversion efficiency because the natural period becomes longer and the frequency can not be increased as the size becomes larger (that is, higher).

  Although the technique disclosed in Patent Document 2 can efficiently extract energy in order to set the natural period of the oscillator to the natural period of the main structure, the amount of energy to be converted is limited by the mass of the oscillator Therefore, there is a problem that there is a limit to the energy that can be obtained.

  On the other hand, in the technique disclosed in Patent Document 3, there is no need to tune the natural period of the vibrator to the natural period of the main structure in order to forcibly, ie, actively deform the vibrator by the rotation of the cam. However, the amount of energy to be converted is limited by the mass of the added vibrator, and the energy for rotating the cam is also required, which causes a problem of energy loss and complicated structure.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a technique for increasing the energy that can be taken out in an apparatus that generates power by attaching a piezoelectric element to a structure.

  An aspect according to the present invention is a power generation structure, and a main structure including a frame composed of columns and beams, and a part of the main structure separated from other parts so as to be relatively displaceable. A seismic element, and a piezoelectric element interposed between the main structure causing relative displacement and the seismic element, wherein the piezoelectric element is oriented to approach each other between the main structure and the seismic element When the relative displacement occurs, the pressure is generated between the main structural body and the aseismic element under the compressive force to generate electric power and generate the relative displacement between the main structural body and the aseismic element. Until it exceeds the value, the main structural body keeps the seismic element connected, and there is a stopper that separates the main structural body and the seismic element from each other when the predetermined value is exceeded.

  With such a configuration, since the piezoelectric element is inserted between the aseismatic element (for example, brace) which is an attached structure and the main structure (or a structure that can be regarded as a part thereof), the aseismatic element Although a large force directly acts on the piezoelectric element between the and the main structure, since the piezoelectric element is directly sandwiched, energy loss can be small and relatively large vibrational energy can be rapidly converted. Moreover, since the load by the high frequency of a seismic resistance element acts on a piezoelectric element, energy conversion in the area | region where efficiency is higher than the frequency of the main structure is possible. As a piezoelectric element suitable for such a structure, a piezoelectric material such as PZT which can be manufactured to a certain degree of thickness can be used.

  Another aspect according to the present invention is a power generation structure, which is a main structure including a frame made of columns and beams, and can be relatively displaced from another portion while being joined to a portion of the main structure. A separate seismic element and a piezoelectric element fixed at a position where relative displacement occurs between the seismic element and the main structure, wherein the piezoelectric element is a relative displacement of the seismic element with the main structure Sometimes the pressure generated between the main structural body and the aseismatic element exceeds a certain value between the main structural body and the aseismic element, which vibrates in positive and negative directions to generate electric power and generate relative displacement. A stopper is interposed to keep the main structural body in a connected state of the aseismic elements, and to separate the main structural body and the aseismic elements from each other when the predetermined value is exceeded.

  With such a configuration, the vibration of the piezoelectric element is the same as the vibration of the seismic element (i.e. the attached structure) alone, that is, the free vibration of the piezoelectric element is not impeded, for example, a frequency of about 100 Hz or more Vibration is realized, and energy is extracted due to the vibration, so that power generation with high power generation efficiency can be realized. In addition, although a seismic wall etc. can also be used as aseismic elements, in the case of assuming braces, the relative rotational deformation with the main structure (column / beam structure) also becomes vibration, so there is little distortion and small force fluctuation. For example, a polymeric piezoelectric material can be used.

  Another aspect according to the present invention is the power generation structure described above, wherein the spring holds a state in which the stopper connects the main structure and the aseismic element, and the pressure exceeds the resistance of the spring. Sometimes the stopper is released, causing the main structure and the seismic element to behave independently and causing the seismic element to vibrate freely relative to the main structure.

  In this case, since the connection mechanism between the main structure and the aseismic element can be realized substantially by a simple structure of a stopper and a spring, maintenance and release of the fixed state of the main structure and the aseismic element, adjustment and maintenance of restoration, Becomes easier.

  According to the present invention, when the main structure and the seismic element are integrated, strain energy due to vibration is stored, and the accumulated strain energy is separated from the main structure, the seismic element vibrating at a frequency with good conversion efficiency, The vibration energy can be converted into electrical energy by the piezoelectric element.

It is a graph which shows the example of the relationship between the frequency in the piezoelectric element based on background art, and power generation efficiency. (A) is an elevation view which shows the relationship between a main structure and a seismic resistance element, (b), (c) is the figure which expanded and showed the specific example of the dashed-dotted-circle part of (a). (A) is an elevation view which shows the connection state of a brace and a beam based on Example 1 of embodiment, (b) is an elevation view which shows a mode when the brace shown to (a) vibrates with respect to a beam (C) is the enlarged view which showed the example of (b). It is an elevation which shows the connection state of a brace and a beam based on Example 2 of embodiment. It is an elevation view which shows the connection state of a brace and a beam based on Example 3 of embodiment. It is an elevation which shows the connection state of a brace and a beam based on Example 4 of embodiment.

  Hereinafter, modes for carrying out the present invention (hereinafter, referred to as “embodiments”) will be described with reference to the drawings. The outline of the present embodiment is as follows. That is, a power generation structure that is attached to a structure such as a building to generate power is assumed. Such a building is susceptible to relatively frequent wind external force, and a large amount of power generation can be expected. However, the energy conversion efficiency tends to be low due to the long natural period. So, in this embodiment, electric power is taken out efficiently using earthquake-resistant elements, such as a brace which has high frequency compared with the main structure of a pillar and a beam frame.

  FIG. 2 shows an overall image of a building 1 which is a power generation structure of the present embodiment. FIG. 2A shows a schematic structure of the building 1. FIG. 2 (b) is an enlarged view of a region X indicated by a dashed dotted line in FIG. 2 (a) and shows an example in which the piezoelectric element 50 is disposed at the connecting portion of the brace 20 and the beam 12 as seismic elements. . More specific examples will be shown in Examples 1, 3 and 4 described later. FIG. 2C is an enlarged view of a region X indicated by a dashed dotted line in FIG. 2A, and shows an example in which the piezoelectric element 50 is disposed in the brace body 21 of the brace 20. A more specific example is shown in Example 2 described later. Although a seismic wall, a stud, etc. may be used as a seismic resistance element, below, an example in case a seismic resistance element is brace 20 is explained.

  First, as shown in FIG. 2 (a), the building 1 is configured to have a main structure 10 composed of a column 11 and a beam 12, and further include a brace 20 as a seismic resistance element as an attached structure. ing. The main structure 10 only needs to have a frame composed of the columns 11 and the beams 12 and therefore includes a bridge pier.

  The brace 20 is joined to a part of the frame (main structure 10) (lower floor or one pillar 11 of the adjacent pillars 11) while the other part (upper floor or other pillar 11) Separates from relative displacement. If the building 1 vibrates significantly due to wind or earthquake and the strain accumulated in the brace 20 exceeds a certain value, the brace 20 separates from the main structure 10 and vibrates independently of the pillars 11 and 12 .

  After the piezoelectric element 50 is disposed at the portion where the brace 20 and the main structure 10 are separated as shown in FIG. 2 (b) or at the brace 20 as shown in FIG. 2 (c) and separated from the main structure 10. By causing the vibration of the brace 20 to act on the piezoelectric element 50, the piezoelectric element 50 is caused to generate power under a vibration condition (frequency) in which the power generation efficiency is relatively high.

  The generated electric power is stored in a storage battery such as a capacitor using a rectifier circuit such as a diode, for example, or used in various electric devices, but those devices can use general known techniques. Further, the storage battery may store not only the power from one piezoelectric element 50 but also the power from a plurality of piezoelectric elements 50.

  Here, the brace 20 is a so-called K-type brace (or Y-type brace), and in a portion where the two leg-shaped (inverted V-shaped) brace main bodies 21 and the two brace main bodies 21 meet at the upper left and right center And a formed brace head 22. The brace head 22 is, for example, separably connected (connected) to the beam central portion 14 of the upper floor when vibration of a predetermined frequency or amplitude occurs. Further, each end 23 of the brace body 21 is rigidly connected (fixed) to the joint portion 13 between the column 11 and the beam 12.

  Here, the connecting portion between the brace head 22 and the beam central portion 14 is attached to the beam 12 by a connecting mechanism 15 having a stopper function. Until the pressure (compression force) generated between the beam 12 and the brace 20 exceeds a certain value, the connection mechanism 15 keeps the beam 12 and the brace 20 connected in a fixed state, that is, in a state of acting integrally. The coupling mechanism 15 separates the beam 12 and the brace 20 when the predetermined value is exceeded. After separation, the brace head 22 and the connection mechanism 15 are separated so as to be capable of relative displacement by vibration, and return to the original fixed state when the vibration is settled.

  As discussed above, after separation from beam 12, brace 20 vibrates independently of beam 12. At this time, the column 11 and the beam 12 vibrate at a relatively low frequency of 0.2 to 0.5 Hz, for example.

  On the other hand, the brace 20 which is an attachment structure vibrates at a relatively high frequency of, for example, 20 to 100 Hz. That is, as shown in FIG. 1, the piezoelectric element 50 having the same frequency as that of the brace 20 can realize, for example, a power generation efficiency exceeding 20%.

  In the fixed state, strain energy is stored in the brace 20 and converted to vibration energy by releasing it. If a large amount of strain energy is converted into vibrational energy at one time and absorbed by the piezoelectric element 50, the number of vibrations of the brace 20 is small, and if it is converted little by little, it vibrates long.

  In a structure composed of a low-frequency beam-column structure (main structure) and braces (accessory structure) with a low frequency of 0.2 to 0.5 Hz, after the deformation caused to the attached structure by external force is released by the stopper The vibration of the attached structure is used to apply a high-pressure cyclic pressure of 20 to 100 Hz, which corresponds to the frequency of the attached structure, to the piezoelectric element placed between the attached structure and the main structure.

  Hereinafter, more specific structures will be described in Examples 1 to 4. The following description focuses on the connection mechanism 15 between the brace head 22 of the brace 20 and the beam 12, and the connection structure between the end 23 and the joint between the column 11 and the beam 12 is a general structure. Description is omitted because it exists.

Example 1
The connection structure of the beam 112 and the brace 120 of this embodiment is shown in FIG. FIG. 3A shows a non-oscillated state, that is, a state in which the brace 120 and the beam 112 are locked. FIG. 3 (b) shows a state in which the locked state is released. FIG.3 (c) is the figure which expanded area | region A of the dashed-dotted circle of FIG. 3 (a).

  The brace head 122 formed at the intersection of the two brace bodies 121 is attached to the beam bottom surface 112 b of the girder 112 a (the beam 112) via the coupling mechanism 125.

  The connection mechanism 125 has a structure in which the spring member 130 on the beam 112 side and the stopper 140 on the brace 120 side are stacked. That is, the spring member 130 urges the stopper 140 to press the brace head 122 of the brace 120. The spring member 130 is, for example, a rubber spring, a compression spring made of a metal material, or the like, but the present invention is not limited to this, and can be appropriately selected according to the required specification.

  The stopper 140 is formed, for example, in a substantially plate shape of hard rubber or steel material, and a protrusion 142 is formed in the direction of the brace 120 at a predetermined position on the surface on the brace 120 side (the lower side in the figure). ing. More specifically, when the brace 120 is in a fixed state, the left and right corners 123 of the brace head 122 abut the protrusion 142. Therefore, the width of the stopper 140 is at least longer than the width of the brace head 122. The biasing force of the spring member 130 brings the brace 120 into a locked state locked to the projection 142 of the stopper 140. Note that parts of different materials may be combined with the plate-like portion of the stopper 140 and the protrusion 142.

  Brackets 115 are provided on both sides of the coupling mechanism 125 in the axial direction of the beam 112. The two brackets 115 sandwich the stopper 140. The bracket 115 extends downward from the upper end surface of the brace head 122 by a predetermined length in the downward direction, that is, in the direction of the brace head 122 and faces the head side surface 124.

  In the area where the left and right head side surfaces 124 and the bracket 115 face each other, the piezoelectric element 150 is disposed so as to be sandwiched between the facing parts. The power converted by the piezoelectric element 150 is stored in the storage battery 190. The bracket 115 can be considered as a part of the main structure 10 since it is fixed to the beam 112.

  The piezoelectric element 150 receives a compressive force to generate a voltage when relative displacement in the direction of approaching each other occurs between the bracket 115 which can be regarded as a part of the main structure 10 and the brace 120 which is a seismic element. It is possible to use a piezo element that is a ceramic material based on PZT (lead zirconate titanate), for example. In particular, in the present embodiment, the piezoelectric element 150 is disposed between the brace 120 where the large force is directly applied and the main structure 10, and the piezoelectric element 150 is directly sandwiched. In this case, vibration energy is rapidly converted to electric energy, and it is assumed that the number of vibrations decreases, so a piezoelectric element 150 made of a material such as PZT is preferable.

  When the main structure 10 (frame) and the brace 20 are integrated, the brace 20 is deformed (distorted) by a relatively low frequency external force of 0.2 to 0.5 Hz, and strain energy is stored. When the strain increases and the lock by the stopper 140 is released, the strain energy is converted into vibration energy of the brace 120.

  When the brace 120 vibrates independently of the main structure 10, the brace 120 vibrates at a relatively high frequency of, for example, 20 to 100 Hz. The vibrating brace 20 repeatedly applies pressure to the piezoelectric element 150 at its frequency.

  Next, the timing at which the brace 120 locks to the stopper 140 is between 0 and 4 cycles until the brace head 122 returns to the neutral position, that is, less than 1/4 cycle, for example, 0. 0. It is about 5 seconds. If the vibration remains too much, the vibration energy is locked without being converted to electrical energy, and strain energy is accumulated. For this reason, it is necessary to perform energy conversion efficiently within a limited time.

  In addition, it is also necessary to reduce the resistance after the stopper 140 is removed. For example, as shown in FIG. 3C, the stopper 140 is fixed by the friction with the brace head 122 and the spring member 130 of the brace head 122 when fixed, and when the horizontal force equal to or greater than their resistance is applied , And the brace 120 vibrates freely.

  In this state, the spring member 130 presses the stopper 140 against the brace head 122 of the brace 120. Therefore, in order to reduce the resistance at that time, the brace 120 is made easy to slide, the protrusion 142 is used as a bearing member, or the connection angle θ with the protrusion 142 of the stopper 140 is appropriate so that the spring member 130 may be small. It is desirable to set to.

Example 2
FIG. 4 shows the connection structure of the beam 212 and the brace 220 in the present embodiment. The illustration shows the non-oscillating state, that is, the state in which the brace 220 and the beam 212 are locked. The mounting position of the piezoelectric element 150 of the first embodiment is changed to the brace body 221 of the brace 220. In the unlocked state, the operation is the same as that in FIG.

  As illustrated, the brace head 222 of the brace 220 is attached to the beam bottom surface 212 b of the girder 212 a (the beam 212) via the coupling mechanism 225.

  As in the first embodiment, the connecting mechanism 225 has a structure in which the spring member 230 on the beam 212 side and the stopper 240 on the brace 220 side are stacked. That is, the spring member 230 biases the stopper 240 and presses it against the brace head 222 of the brace 220.

  A protrusion 242 is formed in a direction toward the brace 220 at a predetermined position on the surface of the stopper 240 on the side of the brace 220 (the lower side in the drawing). More specifically, when the brace 220 is in a fixed state, the left and right corners 223 of the brace head 222 abut the projection 242. The biasing force of the spring member 230 brings the brace 220 into a locked state locked to the projection 242 of the stopper 240. About the point which should consider the shape and slipperiness of the protrusion 242, it is the same as that of Example 1. FIG.

  Brackets 215 are formed on both sides of the coupling mechanism 225 in the axial direction of the beam 212. The two brackets 215 sandwich the stopper 240. The bracket 215 extends downward, generally to the same height as the upper end surface of the brace head 222. The bracket 215 can be considered as a part of the main structure 10 because it is fixed to the beam 212.

  Piezoelectric elements 250 are attached by adhesion, welding or other means to the surfaces on the beams 212 side of the two brace bodies 221 extending obliquely downward from the brace head 222. That is, the piezoelectric element 250 moves integrally with the brace body 221.

  The piezoelectric element 250 vibrates in the positive or negative direction upon relative displacement with the main structure 10 (bracket 215) of the brace 220 to generate a voltage, and is represented by, for example, polyvinylidene fluoride (PVDF). There is one in which such a polymeric piezoelectric material is in the form of a sheet. In the present embodiment, the force acting on the piezoelectric element 250 is substantially due to the vibration of the brace 220 alone. Therefore, the vibration of the piezoelectric element 250 has a frequency close to 100 Hz. In order to extract the vibrational energy, if the natural period of the main structure 10 is, for example, 2 seconds, it vibrates 50 times in 0.5 seconds which is a 1⁄4 period. In order to extract small distortions and small force fluctuations such as the brace 220, the above-mentioned polymeric piezoelectric material is effective.

  According to this embodiment, the brace 220 is released from the beam 212 (main structure 10) by a switch mechanism that can be released when the pressure between the beam 212 (bracket 215) and the brace 220 exceeds a predetermined value. By freely vibrating the brace 220 at a high frequency, power can be efficiently generated by the piezoelectric element 250 installed on the brace 220.

  Example 3

  The third embodiment is a modification of the fixing structure of the stopper 140 and the brace 120 of the first embodiment. In FIG. 5, the connection structure of the beam 312 and the brace 320 of Example 3 is shown. Here, a non-oscillating state, that is, a state in which the brace 320 and the beam 312 are locked is shown.

  The brace head 322 of the brace 320 is fixed to the beam bottom surface 312 b of the girder 312 a (the beam 312) via the coupling mechanism 325.

  The connection mechanism 325 includes a spring member 330, a stopper 340, and a brace recess 323. As in the first embodiment, a spring member 330 is disposed between the stopper 340 and the beam 312 (beam bottom surface 312b). However, the protrusion 342 provided on the stopper 340 is only one at the approximate center in the width direction.

  The brace head 322 formed at the intersection of the two brace bodies 321 is formed with a brace recess 323 in which the projection 342 fits. When the protrusion 342 is fitted in the brace recess 323, the brace 320 is fixed to the beam 312. That is, the spring member 330 urges the stopper 340 to fit and press the brace recess 323 of the brace head 322 of the brace 320.

  Brackets 315 are respectively formed on both sides of the stopper 340 and the spring member 330 which are a part of the connection mechanism 325. The two brackets 315 sandwich the stopper 340. Similar to the first embodiment, the bracket 315 is directed downward, extends longer than the upper end surface of the brace head 322 by a predetermined length, and faces the head side surface 324.

  In the area where the left and right head side surfaces 324 and the bracket 315 face each other, the piezoelectric element 350 is disposed so as to be sandwiched between the facing parts. The bracket 315 can be regarded as part of the main structure 10 since it is fixed to the beam 312.

  The piezoelectric element 350 may be, for example, a piezoelectric element that is a PZT (lead zirconate titanate) -based ceramic material.

  In a state where the beam 312 and the brace 320 are integrated, an external force with a relatively low frequency of 0.2 to 0.5 Hz causes deformation (strain) in the brace 320, and strain energy is stored. When the strain increases and the lock by the stopper 340 is released, the strain energy is converted into vibration energy of the brace 320.

  That is, when a force of a certain level or more is applied to the stopper 340, the spring is pushed up to separate the stopper 340 from the brace recess 323, and the load (strain) borne by the brace 320 causes free vibration of the brace 320 at a high frequency of 20 to 100 Hz. I do. As a result, the brace 320 vibrates in the lateral direction in the drawing, a load due to the vibration is applied to the piezoelectric element, and the piezoelectric element 350 generates power.

  The shapes, surface states, and the like of the brace recess 323 and the stopper 340 are determined in consideration of a condition (strain of the brace 320) in which the stopper 340 separates from the brace recess 323 and vibration and a condition in which the stopper 340 is refitted and fixed.

  In the present embodiment, the connecting mechanism 325 functions as a switch mechanism, and is in a fixed state when the switch is turned on and in a fixed released state when the switch is turned off.

  As in the second embodiment, the piezoelectric element 350 having a plate-like structure made of a polymer material may be attached to the brace body 321 of the brace 320.

Example 4
The fourth embodiment is a modification of the third embodiment, and the configuration of the connecting mechanism 425 which is a switch mechanism is different. FIG. 6 shows the connection structure of the beam 412 and the brace 420 according to the fourth embodiment. Here, a non-oscillating state, that is, a state in which the brace 420 and the beam 412 are locked is shown.

  The brace head 422 formed at the intersection of the two brace bodies 421 is fixed to the beam bottom surface 412 b of the girder 412 a (the beam 412) via the coupling mechanism 425.

  The connection mechanism 425 includes a spring member 430, a stopper 440, and a brace recess 423. The spring member 430 is, for example, a torsion spring, and has a rotation shaft 441 at the center end. A key-shaped stopper 440 extending downward is supported by the rotating shaft 441. The lower end of the stopper 440 is fitted into the brace recess 423.

  In the present embodiment, the spring member 430 is disposed in a region above the beam bottom surface 412b and sandwiched by two brackets 414, and the rotary shaft 441 extends horizontally in the direction of the figure, here in the horizontal direction at the position of the beam bottom surface 412b. And However, as in Example 1-3, the configuration may be such that it is disposed in the area under the beam bottom surface 412b.

  When a force of a predetermined level or more is applied to the stopper 440, the stopper 440 rotates about the rotation shaft 441 and is disengaged. As a result, the brace 420 is released from the fixed state and vibrates freely.

  Two brackets 415 are formed on the beam bottom surface 412 b so as to sandwich the brace head 422 of the brace 420 by a predetermined distance. A piezoelectric element 450 is disposed between the bracket 415 and the head side surface 424. The piezoelectric element 450 can be, for example, a piezoelectric element that is a PZT-based ceramic material.

  When the beam 412 and the brace 420 are integrated, the relatively low frequency external force of 0.2 to 0.5 Hz causes deformation (strain) in the brace 420, and strain energy is stored. When the strain increases and the lock by the stopper 440 is released, the strain energy is converted into vibration energy of the brace 420.

  That is, when a predetermined force or more is applied to the stopper 440, the spring member 430 is elastically deformed via the rotation shaft 441, and the stopper 440 rotates in the load direction. As a result, the stopper 440 is disengaged from the brace recess 423 and the load (strain) borne by the brace 420 causes the brace 420 to freely vibrate at a high frequency of 20 to 100 Hz. As a result, the brace 420 vibrates in the lateral direction in the drawing, a load due to the vibration is applied to the piezoelectric element 450, and the piezoelectric element 450 generates power.

  The shape and surface condition of the brace recess 423 and the stopper 440, the spring member 430, in consideration of the condition (the strain of the brace 320) in which the stopper 440 separates from the brace recess 42 and vibrates and the condition of refitting and fixing. The spring constant of Also, instead of using a torsion spring as the spring member 430, the fixed state of the stopper 440 is released with a certain load or more, and then the fixed state is performed again even if the portion above the rotary shaft 441 of the stopper 440 is sandwiched by coil springs from the left and right. Function can be realized.

  The present embodiment has been specifically described above in the first to fourth embodiments. As described above, according to the present embodiment, the internal braces 20, 120, 220, etc., in a high-rise building (Building 1) having a long natural cycle that is susceptible to relatively frequent wind external force and can expect a large amount of power generation. The mechanical energy (strain energy, vibration energy) can be efficiently converted into electrical energy to extract electric power by using the vibration of the aseismatic elements such as 340 and 420. Even if the external force is an earthquake, the same thing can be generated.

  The present invention has been described above based on the embodiments. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to the combination of the respective constituent elements, and such modifications are also within the scope of the present invention.

  For example, in the above-described first to fourth embodiments, it is assumed that the acquired electric power is used in the storage or the electrical equipment. In addition, by monitoring the output state of the power and comparing it with past data or other outputs, the state of the braces 20, 120, 220, 320, 420, etc. can be grasped. That is, structural deterioration and the like can be determined.

DESCRIPTION OF SYMBOLS 1 Building 10 Main structure 11 Column 12, 112, 212, 312, 412 Beam 13 Connection part 14 Beam center part 15, 125, 225, 325, 425 Connection mechanism 20, 120, 220, 320, 420 Brace 21, 121 221, 321, 421 Brace body 22, 122, 222, 322, 422 Brace head 23 End 50, 150, 250, 350, 450 Piezoelectric element 112a, 212a, 312a, 412a Large beam 112b, 212b, 312b, 412b Beam Bottom surface 115, 215, 315, 414, 415 Bracket 123, 223 Corner 124, 324, 424 Head side surface 130, 230, 330, 430 Spring material 140, 240, 340, 440 Stopper 142, 242, 342 Projection 190 Storage battery 323 , 423 brace recess 441 Rotating shaft

Claims (3)

A main structure having a frame made of columns and beams;
A seismic element that is joined to a part of this main structure, but is relatively displaceably separated from the other part,
A piezoelectric element interposed between the main structure causing the relative displacement and the aseismatic element;
Equipped with
The piezoelectric element generates a power by receiving a compressive force when a relative displacement in the direction of approaching each other occurs between the main structure and the seismic element.
The main structural body connected the seismic resistance element until the pressure generated between the main structural body and the seismic resistance element exceeds a predetermined value between the main structural body causing relative displacement and the seismic resistance element A power generation structure characterized by being interposed with a stopper for keeping the main structure and the aseismic element separated from each other when kept in the state and exceeding the predetermined value. A main structure having a frame made of columns and beams;
A seismic element that is joined to a part of this main structure, but is relatively displaceably separated from the other part,
And a piezoelectric element fixed at a position where relative displacement occurs between the seismic element and the main structure,
The piezoelectric element vibrates in positive and negative directions upon relative displacement of the seismic element with the main structure to generate electric power.
The main structural body connected the seismic resistance element until the pressure generated between the main structural body and the seismic resistance element exceeds a predetermined value between the main structural body causing relative displacement and the seismic resistance element A power generation structure characterized by being interposed with a stopper for keeping the main structure and the aseismic element separated from each other when kept in the state and exceeding the predetermined value.   The spring holds a state in which the stopper connects the main structure and the aseismic element, and when the pressure exceeds the resistance of the spring, the stopper is released to separate the main structure and the aseismic element The power generation structure according to claim 1 or 2, wherein the power generation structure is made to behave.

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