CN104821744A - Bridge sling power generation system based on piezoelectric effect - Google Patents

Abstract

The invention provides a bridge sling power generation system based on a piezoelectric effect. The bridge sling power generation system comprises at least one of a piezoelectric plate mounted on a bridge surface or a piezoelectric plate fixed to a bridge sling anchoring position. The piezoelectric plate is composed of an intermediate piezoelectric block layer and upper and lower hard plates located on upper and lower surfaces of the intermediate piezoelectric block layer. The intermediate piezoelectric block layer contains a plurality of piezoelectric blocks which are connected to a storage battery in a cascaded parallel manner through a charging circuit. The storage battery supplies power for an electricity device on the bridge through a power supply circuit. According to the invention, on the basis of the piezoelectric effect of piezoelectric ceramics, the mechanical energy of a live load (mainly a vehicle load) on the bridge surface is converted into electric energy to be collected and supplied. The bridge sling power generation system does not require substantive changes in an original bridge structure and components thereof, is easy to mount, achieves energy reutilization by converting the mechanical energy into the electric energy, is green and environmentally friendly, and has long-term economic and social benefits.

Description

Based on the bridge sling electricity generation system of piezoelectric effect

Technical field

The present invention relates to piezoelectric ceramic generating and power harvesting technology field.

Background technology

Along with the development of society, the raising of people's living standard, many people have purchased private car; Convenient in order to traffic, government has built many bridges, especially arch bridge, cable-stayed bridge, the bridge of suspension bridge type, grand bridge; Along with the raising of bridge construction technology, bridge is towards Long span, lightness development.This just causes the energy " hidden " on bridge and and go out of use in a large number, for the invention provides necessary condition.

Piezoelectric ceramic after polarization is under pressure generation mechanical deformation, and cause Dipole moment to change, polarization intensity changes thereupon, thus free charge on electrode surface is changed, and namely current charge-discharge electrical phenomena occurs, and produces direct piezoelectric effect.People utilize this character to develop the multiple device being electric energy by changes mechanical energy:

(1) the pocket windmill of piezoelectricity

The Electronics Engineer S.Priya that Texas, USA founds university has invented a kind of pocket windmill can powered for wireless network ".This windmill girth is approximately 10cm, is attached on a swiveling wheel, when cam rotates, a series of piezoelectric crystal can be made constantly to stretch, when piezoelectric is extruded or stretch, just produce electric energy.In the relatively advanced area of wind-force, apply the pocket windmill generating of this piezoelectric type, can be used for various micro-system and drive.

(2) walking piezo-electric generating

People can waste some mechanical energy in motion process, therefore has many about the research on utilization for these energy.Along with portable electric appts (as individual digital player, low-power consumption laptop computer and other individual digital auxiliary equipment, also has the medical devices such as pacemaker.) reduction of volume and power consumption, its power demand is more and more less, facilitates the demand to vibrating power-generation micro battery.

(3) seawave power generation

A kind of system being called waterpower piezoelectric generator has been invented by New Jersey Princeton drive marine technology company, is the first systematic of the phenomenon of piezoelectricity for generating electricity on a large scale.Wave piezo-electric generating is a kind of cheap and method of clear energy sources of obtaining from ocean, and piezopolymer is arranged in a marine huge buoyancy aid grappling chain, is stretched when making piezopolymer, time and be relaxed.Like this, the fluctuation of wave just creates a kind of low-frequency high-tension electricity, then changes high-tension current into by some electronic components, is transported to seashore through submerged cable.A kind of well approach is provided for solving the increasingly serious energy crisis of the mankind.

But the shortcoming of these devices is: 1. piezoelectric ceramic cannot obtain larger STRESS VARIATION amplitude, and partial devices is only limitted to artificial applying; 2. external drive causes piezoelectric ceramic tension and compression to be random chance events, can not ensure the frequent degree that piezoelectric ceramic is out of shape; 3. most of device energy output is little, and energy conversion efficiency is not high, is difficult to provide sufficient electric energy for people on a large scale.

Summary of the invention

The object of the invention is to make up the deficiencies in the prior art, utilize bridge the large energy be missed hidden generate electricity and power.

The object of the invention is to be achieved through the following technical solutions: based on the bridge sling electricity generation system of piezoelectric effect, it is characterized in that: comprise in the piezoelectric board being installed on bridge floor or the piezoelectric board being fixed on bridge sling anchorage point at least one of them, described piezoelectric board is made up of middle piezoelectric blocks layer and the upper and lower hardboard being positioned at middle piezoelectric blocks layer upper and lower surface, middle piezoelectric blocks layer contains polylith piezoelectric blocks and is access to storage battery in plural parallel stage mode through charging circuit, and storage battery is powered to power consumption equipment on bridge by power supply circuits.

The described piezoelectric board being installed on bridge floor is road surface piezoelectric board, described in be fixed on bridge sling anchorage point piezoelectric board be hoist cable piezoelectric board; Described piezoelectric blocks is piezoelectric ceramics block, and each piezoelectric ceramics block is made up of piezoelectric ceramic unit placed in the middle and the metal level being plated in piezoelectric ceramic unit two pole-faces.

Middle piezoelectric blocks layer comprises the fixed form of a lattice-shaped, each grid contents receives the piezoelectric blocks of mounted on top of more than a piece or two pieces, for hoist cable piezoelectric board, after stacking the upper surface of piezoelectric blocks lower than the upper surface of lattice-shaped fixed form, the amount of recess formed ensures that piezoelectric blocks does not participate in the distribution of the initial quiet internal force of bridge.

Described road surface piezoelectric board is installed between the bridge floor layer of bridge floor and bitumen layer.

Described road surface piezoelectric board is arranged in bridge floor each track wheel in the plane on the bridge floor ordinate that overfrequency is higher, and each upper and lower hardboard is greater than the plane projection width of general wheel along the width of bridge floor transverse direction.

Hoist cable piezoelectric board is fixed between the anchor plate of bridge sling and the hold-down nut of its underpart, or directly serves as the anchor plate of bridge sling with hoist cable piezoelectric board.

Described piezoelectric blocks is cube or cylinder, and sectional dimension is at 10 ~ 50mm.

Diode is provided with to control electric current single flow direction storage battery in described charging circuit.

Inverter is provided with to realize direct current and the conversion exchanged in described power supply circuits.

The present invention is based on the direct piezoelectric effect of piezoelectric ceramic, be electric energy by the changes mechanical energy of the mobile load (mainly carload) on bridge floor, carry out collecting and supply use.The present invention does not need to do substantial change to former bridge structure and component thereof, installs simple, and achieve mechanical energy and utilize to the energy secondary of electric energy, environmental protection, has long-range economic and social benefit.

Accompanying drawing explanation

Fig. 1 is the circuit theory diagrams of the bridge sling electricity generation system based on piezoelectric effect of the present invention,

In figure, drag-line 1, bridge floor 2, road surface piezoelectric board 3a, hoist cable piezoelectric board 3b, lead-in wire 4, storage battery 5, control device 6, inverter 7, distributor cap 8, voltameter 9,

Fig. 2 is the circuit connection diagram of the bridge sling electricity generation system based on piezoelectric effect of the present invention,

In figure, 3,5, diode 6 ?1, diode 6 ?2, switch 6 ?3, voltage-stabiliser tube 6 ?4, charging circuit a, power supply circuits b

Fig. 3 is piezoelectric ceramic parallel circuits figure.

Fig. 4 be generate electricity ?electric power system flow chart.

Fig. 5 a ~ 5c is piezoelectric board installation site, road surface picture group, and Fig. 5 a represents the piezoelectric board installation site, road surface of bridge floor longitudinal direction;

Fig. 5 b represents the projection width of bridge floor road surface piezoelectric board transversely and the relation of cartwheel projection width; Fig. 5 c represents the length of road surface piezoelectric board and the relation of wheel diameter,

In figure, 2 ?1 bitumen layer, 2 ?3 floorings

Fig. 6 a ~ 6d is piezoelectric board structural representation picture group, and Fig. 6 a represents piezoelectric board overall structure; Fig. 6 b represents the overall structure of middle piezoelectric blocks layer; Fig. 6 c represents the overall structure of piezoelectric ceramics block; The piezoelectric ceramics block of Fig. 6 d hoist cable piezoelectric board and the cross-sectional view of fixed form,

In figure, upper strata hardboard 3 ?1, middle piezoelectric blocks layer 3 ?2, lower floor's hardboard 3 ?3, piezoelectric ceramics block 3 ?4, fixed form 3 ?5, metal level 3 ?6, piezoelectric ceramic unit 3 ?7, amount of recess 3 ?9

Fig. 7 a is the elevation of vehicular load.

Fig. 7 b is the plane graph of vehicular load.

Fig. 8 is hoist cable anchoring detail drawing,

In figure, hold-down nut 1 ?3, anchor plate 1 ?4.

Embodiment

Be illustrated in figure 1 the bridge sling electricity generation system based on piezoelectric effect of the present invention, it comprises the piezoelectric board being installed on bridge floor, i.e. road surface piezoelectric board, and is fixed on the piezoelectric board of bridge sling anchorage point, i.e. hoist cable piezoelectric board.Both can have both at the same time, also can according to the actual conditions of bridge, as non-cable-suspended bridge or vehicle flowrate little, the wherein a kind of of road surface piezoelectric board or hoist cable piezoelectric board can be only installed.Each piezoelectric board can comprise polylith piezoelectric blocks, and polylith piezoelectric blocks is access to storage battery 5 in plural parallel stage mode through the lead-in wire 4 of charging circuit, thus realizes the collection of electric energy.Storage battery 5 is powered to power consumption equipment on bridge by power supply circuits.As shown in Figure 2, charging circuit adopt diode 6 ?2 control electric current one-way flow, by voltage-stabiliser tube 6 ?4 control within the high-breakdown-voltage that whole circuit is setting at voltage; When for when street lamp, lamp decoration are powered on bridge, Based Intelligent Control can be adopted to realize.In order to adapt to multiple electricity consumption facility, the electric energy of accumulation can directly according to direct current output by control device 6, also can by inverter 7 carry out Zhi Liu ?exchange conversion be general electricity consumption facility power.According to the difference of bridge type, the electric energy that native system produces can difference to some extent, when the electric energy produced is sufficient, electricity consumption facility power on bridge can be only, as street lamp, identification light or Landscape Lamp etc., especially, now at control device 6 place, intelligent controller can be installed, thus realize intelligent power supply.

As shown in Figure 4, for of the present invention generate electricity ?electric power system flow chart.Piezoelectric ceramic receives external drive, produces piezoelectric effect, is electric energy, and is connected with storage battery by controller, reach current collection object by mechanical energy.When storage battery is externally powered, controlled by controller, directly provide DC load or through Zhi Liu ?AC inverter be transformed to general electricity consumption facility AC load be provided.

As shown in Figure 6 a, piezoelectric board adopts three ply board structure: upper strata hardboard 3 ?1, middle piezoelectric blocks layer 3 ?2, lower floor's hardboard 3 ?3.Upper strata hardboard 3 ?1 and lower floor's hardboard 3 ?3 make middle piezoelectric blocks layer 3 ?2 stressed evenly, collect more large-area power, therefore the rigidity of two-layer hardboard needs, and can select corrosion resistant plate enough large.Shown in Fig. 6 b, middle piezoelectric blocks layer 3 ?2 include plural parallel stage piezoelectric ceramics block 3 ?4, piezoelectric ceramics block by the fixed form 3 of a lattice-shaped ?5 to separate and fixing, the piezoelectric blocks of the mounted on top of more than a piece or two pieces can be held in each grid.In this example, the piezoelectric blocks of two pieces of mounted on top is got.As fig. 6 c, each piezoelectric ceramics block 3 ?4 by piezoelectric ceramic unit placed in the middle 3 ?7 and be plated in piezoelectric ceramic unit 3 ?7 two pole-faces metal level 3 ?6 to form.

Road surface piezoelectric board 3a is applicable to the larger bridge type of vehicle flowrate, its be arranged on bridge floor surface layer 2 ?3 and bitumen layer 2 ?between 1, specifically as shown in Figure 5 a.And as shown in Fig. 5 b, Fig. 5 c, road surface piezoelectric board 3a is arranged in bridge floor each track wheel in the plane on the bridge floor ordinate that overfrequency is higher.Dimensionally, and the upper and lower hardboard of each road surface piezoelectric board is greater than the plane projection width of general wheel along the width of bridge floor transverse direction.

Hoist cable piezoelectric board can only be used in hoist cable structure with the wrist raised with on the larger bridge of Suo Li amplitude of variation after dynamic load, and its installation site is the position of anchor plate 1 ?4 of hoist cable, sees Fig. 8.When upper strata hardboard 3 ?1 chosen, lower floor's hardboard 3 ?3 are for steel plate, piezoelectric board directly can replace original anchor plate 1 ?4; Or do not substitute, then piezoelectric board can be placed in hoist cable hold-down nut 1 ?3 and anchor plate 1 ?between 4, but need to carry out proper extension to hoist cable.In sectional dimension, hoist cable piezoelectric board should consider the shape and size that actual anchors maintenance is put, should be measure-alike so that install with anchor plate.The thickness of piezoelectric board should consider the middle superimposed number of plies of piezoelectric blocks layer 3 ?2 and the size of anchorage point.

In order to ensure that the maximum, force suffered by piezoelectric blocks two ends is stabilized in desired value, in the middle of adjustable in piezoelectric blocks layer piezoelectric ceramics block 3 ?4 and fixed form 3 ?5 area ratio and modulus of elasticity ratio, carry out internal force distribution.Piezoelectric board two ends, road surface are general not quite stressed, and the block number that can directly select required for the Stress calculation at piezoelectric ceramics block two ends, now fixed form only plays fixing piezoelectric ceramics block effect.Generally there is larger initial quiet internal force at hoist cable place in the bridge with hoist cable structure, can make piezoelectric blocks 3 ?4 (one or more stack after) fixed form 3 ?5 places have an initial amount of recess 3 ?8, as shown in fig 6d, to ensure that piezoelectric blocks does not participate in the distribution of initial quiet internal force, and the area ratio of the fixing fixed form area of calculating and piezoelectric blocks is to ensure at dynamic endogenetic process lower piezoelectric block two ends stress value, now fixed form participates in stressed, and its modulus of elasticity should be less than the value of piezoelectric blocks; In order to the Static Correction ensureing fixed form is by the constraint of piezoelectric blocks, can not viscous between piezoelectric ceramics block and fixed form; Piezoelectric blocks shape generally adopts cube or cylinder, and sectional dimension, generally between 10 ~ 50mm, can either have higher electric energy conversion efficiency, prevents again electric capacity breakdown.

Piezoelectric ceramic should have higher piezoelectric constant, dielectric coefficient, ultimate strength.Lead zirconate titanate system (PZT) piezoelectric ceramic should be selected, its Curie point 300 ?between 400 DEG C, not lower transformation temperature, in larger temperature range, performance is all more stable, as transductive material, its piezoelectric effect is very remarkable, can in very large range adjust its performance by changing its chemical constituent, to meet multiple different needs, lead zirconate titanate is of a great variety, differ from one another; The coat of metal of the two-layer electrode of piezoelectric blocks can select copper metal; The puncture voltage of storage battery (charging capacitor) is not less than the voltage at piezoelectric board two ends, prevents breakdown.

Realize being described further to the structure of native system and method below in conjunction with relevant drawings one instantiation:

Certain pottery in the PZT system with high electromechanical coupling factor high-tension electricity strain constant and high resistivity is selected to be example, relevant parameter: ε ₃₃=1700 ε ₀, K ₃₃=0.71, d ₃₃=374pcN ^-1n.

Ma Ling river bridge is the domestic extra-large bridge in Shan (head) elder brother (bright) highway Guizhou Province, across Ma Ling river Grand Canyon.Main bridge is double tower two rope faces slant-pull structures, most high tower height 187m, main span 360m, the every side of the every tower of bridge has 22 pairs of drag-lines, with speed of a motor vehicle 80km/h, Analysis of Dynamic Characteristics is done to this bridge, the known most tackline near bridge tower maximum dynamic in amplitude of variation reach 850kN, maximum static internal force is 7500kN, and it is 480kN that the longest rope moves internal force.The time of integration, step-length got 0.02s, and namely the action period is T=0.02s.

Hoist cable piezoelectric board monolithic adopts size 550 × 550 (mm), and road surface piezoelectric board size adopts 200 × 200 (mm), loads according to city lane load.Maximum allowable axle load T (diaxon) is 140kN as shown in Figure 7a, ensures that each piezoelectric ceramics block two ends are stressed at about 30 ~ 50Mp, then need the effective pressure area of piezoelectric ceramic to be 3000 ~ 5000 (mm ²), get single piezoelectric blocks size 40 × 20 × 10 (mm), according to invention thinking, the stress at each piezoelectric blocks two ends can control according to actual needs, and this example chooses 50Mp.

For road surface piezoelectric board: the power acting on piezoelectric ceramics block two ends is: F _max=σ _maxa=40000N, if all power is all approximate according to sinusoidal variations, namely live loading can regard an impulsive force as on piezoelectric board, and this power can be expressed as: $\text{F=40000sin}\frac{\mathrm{\π}}{0.02}\mathrm{tN}$ (t：0～0.02s)

Can obtain according to basic piezoelectricity formula:

Piezoelectric ceramic two ends transient maximum voltage:

$U_{\max }=g_{33}\frac{\mathrm{FL}}{A}=\frac{d_{33}}{{\mathrm{\ϵ}}_{33}}\frac{\mathrm{FL}}{A}=\frac{400\×{10}^{-12}}{2100\×8.85\×{10}^{-12}}\frac{40000\×20\×{10}^{-3}}{40\×20\×{10}^{-6}}=21.5\mathrm{KV}$

External work: because external force is according to sinusoidal variations, need integral and calculating.

$\mathrm{Wm}=\frac{1}{2}F\left(t\right)\∫d{\mathrm{\δ}}_L^D$

Wherein $d{\mathrm{\δ}}_L^D=S_{33}^{D}d\frac{F_{33}L}{A}=\frac{S_{33}^{D}L}{A}d{F}_{33}=\frac{S_{33}^{D}L}{A}{F}_{33}^{\′}\mathrm{dt},k_{33}^2=d_{33}^2/{\mathrm{\ϵ}}_{33}^X{S}_{33}^E$

Substitution formula has:

$w_e=\frac{1}{2}F{\mathrm{\δ}}_L^D=\frac{1}{2}F\left(t\right)\∫d{\mathrm{\δ}}_L^D=\frac{1}{2}{F}_{33}\left(t\right)k_{33}^2{\∫}_0^{t/2}\frac{S_{33}^{D}L}{A}{F}_{33}^{\′}\left(t\right)\mathrm{dt}=\frac{k_{33}^2{S}_{33}^{D}L}{2A}\frac{{F_{\max }}^2\left(t\right)}{2}$

$w_e=\frac{d_{33}^2{F_{\max }}^{2}L}{4A{\mathrm{\ϵ}}_{33}^X(1-k_{33}^2)}=93.74\mathrm{mJ}$

Axel load distribution is on pair of wheels, then piezoelectric board corresponding wheel in road surface is arranged in pairs, and every road pavement piezoelectric board needs bearing area to be 2800mm ²can derive, each middle piezoelectric blocks layer needs piezoelectric blocks 4 pieces, by rebuilding, then often pair of piezoelectric board can produce electric energy 749.92mJ in each pulse, then often cross this electric energy that a car can produce general about 8 times, namely be about 6J, calculate by vehicle flowrate 10,000 ~ 80,000, often pair of plate can produce (6 ~ 48) × 10 altogether ⁴the energy of J, can be used for bulb point one hours of a 100W.If bridge is long 300 meters, altogether can the such piezoelectric board hundreds of of anchoring, enough to bridge floor street lamp power supply, road lamp power supply.

Similarly, can design the piezoelectric ceramic stability under loading at suspension cable place at about 50Mp, the electric energy that each piezoelectric blocks produces when each pulse is like this about 93.7mJ.Carry out now the piezoelectric board design of drag-line place.Consider anchorage point size, the upper and lower hardboard of piezoelectric board adopts the size design identical with anchor plate, and the area of middle electric layer piezoelectric ceramic should be arranged according to Practical Calculation.Provide computational methods below:

If middle piezoelectric layer is made up of bi-material, namely the fixed form bi-material of piezoelectric ceramic and fixing piezoelectric ceramic combines.Consider that the comparatively dynamic internal force of the initial quiet internal force in drag-line place is much larger, need the code reassignment carrying out material area, now piezoelectric is due to the recessed distribution not participating in quiet internal force in template inside, and we can control amount of recess by the size of quiet internal force.The elastic modulus E of known piezoelectric ceramic _d≈ 0.5 × 10 ⁵mp, the modulus of elasticity of template is E _m≈ 0.1 × 10 ⁵mp.According to supposition, piezoelectric ceramic only participates in the code reassignment of dynamic internal force, and the strain both during distribution is equal.(E _dA _d+E _mA _m)ε＝Fd。In order to ensure that piezoelectric ceramic stress is at 50Mp, by ε=σ _max/ E is known now when the strain that should occur at Under Dynamic Load lower piezoelectric layer is 0.001. initial quiet internal force is born by template completely, has E _ma _mε _m=Fs.Carry out tentative calculation, if individual layer has 8 pieces of piezoelectric blocks, A _d=6400, answer above-mentioned equation, known:

$A_m=53000{\mathrm{mm}}^2,{\mathrm{\σ}}_m=\frac{F_s}{A_m}=141.5\mathrm{Mp},\mathrm{\ϵ}=\frac{\mathrm{\σ}}{E}=1.1415\×{10}^{-2}$

Piezoelectric blocks is according to rebuilding, and middle piezoelectric layer thickness is 20mm, known piezoelectric blocks amount of recess Δ l=ε l=0.283mm.The area ratio of piezoelectric blocks and fixed form is about 1:8.So just, can ensure that piezoelectric ceramic is stressed at about 50Mp, now (supposing that quantity the is 16 pieces) piezoelectric ceramic at each drag-line place is about 1.5J at a raw electric energy of burst length common property, suppose that full-bridge has 20 to such drag-line, at average daily vehicle flowrate be 10,000 ~ 80,000 bridge on the raw electricity (60 ~ 480) × 10 of common property ⁴j, can be used for the bulb of a 100W not light 2 ~ 13 hours not etc.

Here one is only provided to implement example.In fact piezoelectric ceramic according to the compression strength of real material, can enable its two ends bear larger pressure, selects the material that conversion ratio is high, and increase the number etc. of piezoelectric blocks, the electricity of the generation of such piezoelectric ceramic can be multiplied.

Invention has been described more than to adopt example.But those those skilled in the art become after having read disclosure file and improve at a glance and revise, and still belong to the category of the application.

The inventive method makes, it is simple to install, and life cycle is long.Can not make substantial change to original bridge structure, piezoelectric board both sides are stressed adjustable.The secondary that can realize discarded energy utilizes, and environmental protection, has long-range economic results in society.

The present invention includes but be not limited to above-described embodiment and content shown in the drawings, other all fall within protection scope of the present invention with the product structure that technical scheme of the present invention has identical essentiality content.

Claims (9)

1. based on the bridge sling electricity generation system of piezoelectric effect, it is characterized in that: comprise in the piezoelectric board being installed on bridge floor or the piezoelectric board being fixed on bridge sling anchorage point at least one of them, described piezoelectric board is made up of middle piezoelectric blocks layer and the upper and lower hardboard being positioned at middle piezoelectric blocks layer upper and lower surface, middle piezoelectric blocks layer contains polylith piezoelectric blocks and is access to storage battery in plural parallel stage mode through charging circuit, and storage battery is powered to power consumption equipment on bridge by power supply circuits.

2. the bridge sling electricity generation system based on piezoelectric effect according to claim 1, is characterized in that: described in be installed on bridge floor piezoelectric board be road surface piezoelectric board, described in be fixed on bridge sling anchorage point piezoelectric board be hoist cable piezoelectric board; Described piezoelectric blocks is piezoelectric ceramics block, and each piezoelectric ceramics block is made up of piezoelectric ceramic unit placed in the middle and the metal level being plated in piezoelectric ceramic unit two pole-faces.

3. the bridge sling electricity generation system based on piezoelectric effect according to claim 2, it is characterized in that: middle piezoelectric blocks layer comprises the fixed form of a lattice-shaped, each grid contents receives the piezoelectric blocks of mounted on top of more than a piece or two pieces, for hoist cable piezoelectric board, after stacking the upper surface of piezoelectric blocks lower than the upper surface of lattice-shaped fixed form, the amount of recess formed ensures that piezoelectric blocks does not participate in the distribution of the initial quiet internal force of bridge.

4. the bridge sling electricity generation system based on piezoelectric effect according to claim 2, is characterized in that: described road surface piezoelectric board is installed between the bridge floor layer of bridge floor and bitumen layer.

5. the bridge sling electricity generation system based on piezoelectric effect according to claim 4, it is characterized in that: described road surface piezoelectric board is arranged in bridge floor each track wheel in the plane on the bridge floor ordinate that overfrequency is higher, and each upper and lower hardboard is greater than the plane projection width of general wheel along the width of bridge floor transverse direction.

6. the bridge sling electricity generation system based on piezoelectric effect according to claim 2, it is characterized in that: hoist cable piezoelectric board is fixed between the anchor plate of bridge sling and the hold-down nut of its underpart, or directly serve as the anchor plate of bridge sling with hoist cable piezoelectric board.

7. the bridge sling electricity generation system based on piezoelectric effect according to claim 2, is characterized in that: described piezoelectric blocks is cube or cylinder, and sectional dimension is at 10 ~ 50mm.

8. the bridge sling electricity generation system based on piezoelectric effect according to claim 2, is characterized in that: be provided with diode in described charging circuit to control electric current single flow direction storage battery.

9. the bridge sling electricity generation system based on piezoelectric effect according to claim 2, is characterized in that: be provided with inverter in described power supply circuits to realize direct current and the conversion exchanged.