CN107869140B - The vibrohammer for reducing vibration influence ambient enviroment is damped based on adjusting - Google Patents
The vibrohammer for reducing vibration influence ambient enviroment is damped based on adjusting Download PDFInfo
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- CN107869140B CN107869140B CN201711133712.0A CN201711133712A CN107869140B CN 107869140 B CN107869140 B CN 107869140B CN 201711133712 A CN201711133712 A CN 201711133712A CN 107869140 B CN107869140 B CN 107869140B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/10—Follow-blocks of pile-drivers or like devices
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Abstract
The invention discloses a kind of based on the vibrohammer for adjusting damping reduction vibration influence ambient enviroment, including sequentially connected mass block, damping spring mixed structure, exciting hammer, the first helical spring from top to bottom；The damping spring mixed structure includes the second helical spring, third helical spring, the first damper, the second damper, the first bearing plate and the second bearing plate.When the excited frequency of exciting hammer passes through ground resonant frequency, damped coefficient by adjusting the first damper and the second damper makes the system of additional mass, spring and adjustable dampers composition inhibit the vibration of exciting hammer as damper, to reduce the influence that ground resonates to close to buildings；And when exciting hammer excited frequency reaches working frequency, making the system of additional mass, spring and adjustable dampers composition as vibration amplifier by the variation of adjustable dampers increases the dynamic loading that vibrohammer is applied in stake, to accelerate pile sinking.
Description
Technical field
The invention belongs to the pile vibrosinking fields of geotechnical engineering, more particularly to one kind to be based on adjusting damping and reducing vibrating influence
The vibrohammer of ambient enviroment.
Background technique
, can be in stake top portion static loading to which stake to be pressed into soil layer in geotechnical engineering piling construction, it can also be in stake
Stake is squeezed into soil layer with shock loading by top, but larger to surrounding environment influence under impact loading, therefore in building woods
The method of this impact piling in vertical urban district is often forbidden to use.Also have at present and hammers into shape that stake is driven to generate in stake top clamping vibration
The vertical sustained vibration of certain frequency, the side friction and end resistance of stake and soil reduce in this process, so that stake be sunk
Enter in ground, this method is in contrast smaller to surrounding environment influence, but this vibration hammer is by pairs of eccentric matter
Gauge block rotation generates vertical exciting force, and the rotational frequency of eccentric massblock is gradually increased and wanted by zero during starting
Pass through the resonant frequency of ground, up to reaching stable work rotational frequency, and the rotational frequency of eccentric massblock passes through ground
Resonant frequency when foundation vibration obviously increase, excessive vibration especially can be caused to close to buildings in urban district, therefore limit
Use of this vibration hammer in urban district.Therefore people, which have also been developed, exempts from resonance hammer, i.e., multiple groups eccentric massblock rotational frequency exists
When near when ground resonant frequency, the vertical and horizontal direction exciting force that eccentric massblock generates is cancelled out each other, in this way in eccentric matter
Gauge block, which would not generate vibration to ground when rotation being accelerated to pass through ground resonant frequency, to be influenced, and eccentric massblock revolving speed reaches steady
The horizontal direction exciting force that multiple groups eccentric massblock generates after fixed working frequency is cancelled out each other and vertical exciting force is overlapped mutually, from
And stake vibration-sunk is driven to enter ground.This resonance of exempting from is hammered into shape because influencing very little to close to buildings, close in building
It succeeds in the urban district of collection application, but this resonance hammer of exempting from is at high price and far more than common vibration hammer price.Therefore
A kind of vibrohammer is needed, it has additional mass, spring and adjustable dampers, i.e. the excited frequency of vibration hammer passes through ground
When base resonant frequency, the system of additional mass, spring and adjustable dampers composition is made by the variation of adjustable dampers
Inhibit the vibration of vibration hammer as damper, to reduce the influence that ground resonates to close to buildings；And when vibration hammer hammer swashs
When vibration frequency reaches working frequency, additional mass, spring and adjustable dampers group are made by the variation of adjustable dampers
At system as vibration amplifier increase vibrohammer be applied to the dynamic loading in stake, to accelerate pile sinking.
Summary of the invention
The present invention is in order to overcome common vibrohammer excited frequency to be increased to during working frequency by zero because passing through ground
Base resonant frequency and the problem for causing ambient environment vibrations excessive, and be difficult to amplify vibrohammer vibration in working frequency
Problem, the present invention provides a kind of based on the vibrohammer for adjusting damping reduction vibration influence ambient enviroment.
Technical solution of the present invention: it is a kind of based on the vibrohammer for adjusting damping reduction vibration influence ambient enviroment, including
Sequentially connected mass block, damping spring mixed structure, exciting hammer, the first helical spring from top to bottom；
The damping spring mixed structure includes the second helical spring, third helical spring, the first damper, the second damping
Device, the first bearing plate and the second bearing plate；At the top of first damper, at the top of the second damper and at the top of the second helical spring
It is connect respectively with mass block, first damper bottom and third helical spring bottom connect with the first bearing plate top respectively
It connects, the first bearing plate, which is covered, hammers top into shape in exciting, and second damper bottom and the second helical spring bottom are held with second respectively
Pressing plate connection, the second bearing plate cover on third helical spring top.
Preferably, the damper of first damper and the adjustable damped coefficient of the second damper, first resistance
Buddhist nun's device can provide negative damping factor and positive damping coefficient, and what conventional damper provided is all positive damping coefficient, and it is described just
Damped coefficient shows the power that damper provides and directional velocity on the contrary, the negative damping factor shows the power that damper provides and speed
It is identical to spend direction.First damper includes force rod, piston, fluid cylinder, first pressure controller, second pressure controller
And speedometer, the speedometer are attached on force rod, the piston can be free to slide in fluid cylinder and fluid cylinder is divided into
One chamber and second chamber, force rod pass through fluid cylinder outer wall and are fixedly connected with the piston, first pressure controller and the first chamber
Room connects and accurately real-time control first chamber fluid pressure, second pressure controller can connect with second chamber and can be accurate
Real-time control second chamber fluid pressure, the fluid in first chamber and second chamber cannot mutually circulate and all big with the external world
Air bound is exhausted；The first pressure controller and second pressure controller are all dynamic servo control Fluid pressure, have fining
Adjust the ability of pressure.When specified first damper provides damped coefficient c1When, adjust first pressure controller and the second control
The pressure of device, to make first chamber and second chamber to the resultant force F of pistonc1With piston movement speed vvRatio be equal to damping
Coefficient c1, i.e. c1=Fc1/vv, as damped coefficient c1Power F when for negative valuec1With piston movement speed vvDirection it is identical, when damping be
Number c1For timing power Fc1With piston movement speed vvIt is contrary.
Preferably, the second damper can for adjustable damping MR damper or with the first damper structure phase
Together.
Preferably, exciting hammer is rotated by eccentric massblock generates exciting force, and eccentric massblock with electricity consumption or can use bavin
Oil machine driving rotation.
Preferably, first bearing plate is piezoelectric ceramic piece and is furnished with energy storage circuit and battery, the first pressure-bearing
Plate, energy storage circuit and battery are sequentially connected, the connection of first pressure controller in battery and the first damper and
The connection of second pressure controller.Battery receives the electric energy that piezoelectric ceramic piece is generated by voltage fluctuation by energy storage circuit.
A kind of pile sinking process based on the vibrohammer for adjusting damping reduction vibration influence ambient enviroment, including following steps
It is rapid:
Step 1: stake is stood on above foundation soil vertically, from bottom to up hammer stake, fixture, the first helical spring, exciting into shape,
Damping spring mixed structure, mass block link together；
Step 2: starting exciting hammer inhibits exciting hammer to make during the excited frequency of exciting hammer passes through ground resonant frequency
With the exciting force on fixture, that is, pass through the damped coefficient for adjusting the first damper and the second damper, to make damping spring
Mixed structure and mass block constitute vibration insulating system:
Each variable is defined as follows:
m1: exciting hammers quality into shape
m2: mass block quality
k1: the rigidity of the first helical spring
k2: the rigidity of the second helical spring in damping spring mixed structure
k3: the rigidity of third helical spring in damping spring mixed structure
c1: the damped coefficient that the first damper provides
c2: the damped coefficient that the second damper provides
K: the equivalent stiffness of damping spring mixed structure
C: the equivalent damping of damping spring mixed structure
F1: the exciting force on exciting hammer is acted on, there is F1=F0sin(ωt)
F0: for exciting force F1Amplitude
ω: for exciting force F1Frequency
T: for the time
A1: the amplitude of exciting hammer
F2: the first helical spring acts on the exciting force on fixture
Then it is respectively as follows: by damping spring mixed structure can be obtained in kinetics relation equivalent stiffness k and equivalent damping c
The amplitude A of exciting hammer can be obtained by kinetics relation1Are as follows:
Obviously when the amplitude A of exciting hammer1The exciting force F on fixture is acted on when=02It is 0, to make A1=0 requires to hinder
The equivalent stiffness k=ω of Buddhist nun's spring mixed structure2m2Equivalent damping c=0 simultaneously, therefore the first damper damping system is adjusted in real time
Number c1With the second damper damped coefficient c2, so thatAndHere the damped coefficient c of the first damper1Take the damping system of negative and the second damper
Number c2Positive value is taken, at this moment damping spring mixed structure and mass block constitute vibration insulating system, pass through ground in the excited frequency of exciting hammer
Play the role of that exciting hammer is inhibited to act on the exciting force on fixture during base resonant frequency, to reduce exciting hammer to surrounding
The influence of environment；
Step 3: when the excited frequency of exciting hammer rises to stable working frequency, by adjusting the first damper and second
The damped coefficient of damper, so that damping spring mixed structure and mass block be made to constitute power augmentation system:
The definition of each variable as shown in step 2, exciting hammer amplitude A1In expression formula:
If damping spring mixed structure and mass block is made to constitute power augmentation system, it is desirable that the denominator in above-mentioned expression formula is
0, at this moment require the equivalent stiffness of damping spring mixed structureEquivalent damping c=0 simultaneously, thus it is real
When adjust the first damper damped coefficient c1With the second damper damped coefficient c2, so thatSimultaneouslyHere the first resistance
The damped coefficient c of Buddhist nun's device1Take the damped coefficient c of negative and the second damper2Positive value is taken, at this moment damping spring mixed structure and matter
Gauge block constitutes power augmentation system, and fixture is accelerated pile sinking by the exciting force maximum of the first helical spring.
Preferably, the first damper damped coefficient c of the adjusting1Method be adjust first pressure controller and second control
The pressure of device processed, to make first chamber and second chamber to the resultant force F of pistonc1With piston movement speed vvRatio be equal to resistance
Buddhist nun's coefficient c1, i.e. c1=Fc1/vv, as damped coefficient c1Power F when for negative valuec1With piston movement speed vvDirection it is identical, work as damping
Coefficient c1Power F when for positive valuec1With piston movement speed vvIt is contrary.
Preferably, vibration causes the first bearing plate upper and lower surface electricity made of piezoelectric ceramic piece in the step 2 and step 3
Pressure fluctuation, this voltage fluctuation are stored in battery by energy storage circuit, and battery is to the first pressure in the first damper
Force controller and second pressure controller auxiliary power supply, to reduce power consumption.
During overcoming common vibrohammer excited frequency to increase to working frequency by zero
The problem for causing ambient environment vibrations excessive because passing through ground resonant frequency, and be difficult to amplify vibropile in working frequency
The problem of hammer vibration, the present invention provides a kind of vibrohammers that ambient enviroment is influenced based on adjusting damping reduction vibration.
Detailed description of the invention
Fig. 1 is integral assembling structure and stake synergistic effect schematic diagram of the invention；
Fig. 2 is the structural schematic diagram of damping spring mixed structure of the invention；
Fig. 3 is the first damper structure schematic diagram that can provide negative damping factor of the invention；
Fig. 4 is piezoelectric ceramic piece of the invention, energy storage circuit, battery and the first damper connection schematic diagram；
1. ground in figure, 2., 3. fixtures, 4. first helical springs, 5. excitings hammer, 6. damping spring mixed structures, 7.
Mass block, 8. second helical springs, 9. third helical springs, 10. first dampers, 11. second dampers, 12. first pressure-bearings
Plate, 13. second bearing plates, 14. force rods, 15. pistons, 16. fluid cylinders, 17. first pressure controllers, 18. second pressure controls
Device processed, 19. first chambers, 20. second chambers, 21. speedometers, 22. energy storage circuits, 23. batteries.
Specific embodiment
In order to realize the present invention technological means, character of innovation, reach purpose and effect is easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
As in Fig. 1-Fig. 4 it is a kind of based on adjust damp reduce vibration influence ambient enviroment vibrohammer, including from up to
Under sequentially connected mass block 7, damping spring mixed structure 6, exciting hammer into shape the 5, first helical spring 4；
The damping spring mixed structure includes the second helical spring 8, third helical spring 9, the first damper 10, second
Damper 11, the first bearing plate 12 and the second bearing plate 13；First damper, 10 top, 11 top of the second damper and the
Two helical springs, 8 top is connect with mass block 7 respectively, 10 bottom of the first damper and 9 bottom of third helical spring difference
It is connected at the top of the first bearing plate 12, the first bearing plate 12, which is covered, hammers 5 tops, 11 bottom of the second damper and second into shape in exciting
8 bottom of helical spring is connect with the second bearing plate 13 respectively, and the second bearing plate 13 covers on 9 top of third helical spring；
As shown in figure 3, first damper includes force rod 14, piston 15, fluid cylinder 16, first pressure controller
17, second pressure controller 18 and speedometer 21, the speedometer 21 are attached on force rod 14, and the piston 15 can be in fluid cylinder
It is free to slide and divide fluid cylinder 16 for first chamber 19 and second chamber 20 in 16, force rod 14 pass through 16 outer wall of fluid cylinder and
It is fixedly connected with piston 15, first pressure controller 17 connect with first chamber 19 and accurately controls fluid in first chamber 19
Pressure, second pressure controller 18 connect with second chamber 20 and accurately control 20 fluid pressure of second chamber, the first chamber
Fluid in room 19 and second chamber 20 cannot mutually circulate and all completely cut off with ambient atmosphere.17 He of first pressure controller
Second pressure controller 18 all controls Fluid pressure for dynamic servo, the ability that there is fining to adjust pressure.When specified first
Damper 10 provides damped coefficient c1When, the pressure of first pressure controller 17 and second controller 18 is adjusted, to make first
The resultant force F of chamber 19 and second chamber 20 to piston 15c1With 15 movement velocity v of pistonvRatio be equal to damped coefficient c1, i.e. c1
=Fc1/vv, as damped coefficient c1Power F when for negative valuec1With 15 movement velocity v of pistonvDirection it is identical, as damped coefficient c1It is positive
When power Fc1With 15 movement velocity v of pistonvIt is contrary；
Second damper 11 is the MR damper or identical as 10 structure of the first damper of adjustable damping；
First bearing plate 12 is piezoelectric ceramic piece and is furnished with energy storage circuit 22 and battery 23, the first bearing plate
12 (piezoelectric ceramic pieces), energy storage circuit 22 and battery 23 are sequentially connected, and in battery 23 and the first damper 10
One pressure controller 17 and second pressure controller 18 connect.Battery 23 receives the first bearing plate by energy storage circuit 22
The electric energy that 12 (piezoelectric ceramic pieces) are generated by voltage fluctuation.
The present invention is based on adjust to damp the pile sinking process for reducing the vibrohammer that vibration influences ambient enviroment, including following steps
It is rapid:
Step 1: as shown in Figure 1, stake 2 is stood on vertically above 1 soil layer of ground, from bottom to up by stake 2, fixture 3, the first spiral shell
Rotation spring 4, exciting hammer 5, damping spring mixed structure 6, mass block 7 link together；
Step 2: starting exciting hammer 5 inhibits exciting during the excited frequency of exciting hammer 5 passes through 1 resonant frequency of ground
Hammer 5 acts on the exciting force on fixture 3, i.e., by adjusting the damped coefficient of the first damper 10 and the second damper 11, thus
Damping spring mixed structure 6 and mass block 7 is set to constitute vibration insulating system:
Each variable is defined as follows:
m1: exciting hammers 5 mass into shape
m2: 7 mass of mass block
k1: the rigidity of the first helical spring 4
k2: the rigidity of the second helical spring 8 in damping spring mixed structure 6
k3: the rigidity of third helical spring 9 in damping spring mixed structure 6
c1: the damped coefficient that the first damper 10 provides
c2: the damped coefficient that the second damper 11 provides
K: the equivalent stiffness of damping spring mixed structure 6
C: the equivalent damping of damping spring mixed structure 6
F1: the exciting force on exciting hammer 5 is acted on, there is F1=F0sin(ωt)
F0: for exciting force F1Amplitude
ω: for exciting force F1Frequency
T: for the time
A1: the amplitude of exciting hammer 5
F2: the first helical spring 4 acts on the exciting force on fixture 3
Then it is respectively as follows: by damping spring mixed structure 6 can be obtained in kinetics relation equivalent stiffness k and equivalent damping c
The amplitude A of exciting hammer 5 can be obtained by kinetics relation1Are as follows:
Obviously when the amplitude A of exciting hammer 51The exciting force F on fixture 3 is acted on when=02It is 0, to make A1=0 requires
The equivalent stiffness k=ω of damping spring mixed structure 62m2Equivalent damping c=0 simultaneously, therefore adjust the first damper 10 damping system
Number c1With 11 damped coefficient c of the second damper2, so thatAndHere the damped coefficient c of the first damper 101Take the resistance of negative and the second damper 11
Buddhist nun's coefficient c2Positive value is taken, at this moment damping spring mixed structure 6 and mass block 7 constitute vibration insulating system, in the excited frequency of exciting hammer 5
It passes through 1 resonant frequency of ground to play the role of that exciting hammer 5 is inhibited to act on the exciting forces on fixture 3 in the process, swash to reduce
Influence of the vibration hammer 5 to ambient enviroment；
Step 3: when the excited frequency of exciting hammer 5 rises to stable working frequency, by adjusting 10 He of the first damper
The damped coefficient of second damper 11, so that damping spring mixed structure 6 and mass block 7 be made to constitute power augmentation system:
The definition of each variable hammers 5 amplitude A into shape as shown in step 2, in exciting1In expression formula:
If damping spring mixed structure 6 and mass block 7 is made to constitute power augmentation system, it is desirable that the denominator in above-mentioned expression formula
It is 0, at this moment requires the equivalent stiffness of damping spring mixed structure 6Equivalent damping c=0 simultaneously, therefore
Adjust the damped coefficient c of the first damper 101With the damped coefficient c of the second damper 112, so thatSimultaneouslyHere the first resistance
The damped coefficient c of Buddhist nun's device 101Take the damped coefficient c of negative and the second damper 112Positive value is taken, at this moment damping spring mixed structure 6
Power augmentation system is constituted with mass block 7, and fixture 3 is accelerated pile sinking 2 by the exciting force maximum of the first helical spring 4.
Preferably, 10 damped coefficient c of the first damper of the adjusting1Method be to adjust first pressure controller 17 and the
The pressure of two controllers 18, to make first chamber 19 and second chamber 20 to the resultant force F of piston 15c1With 15 movement velocity of piston
vvRatio be equal to damped coefficient c1, i.e. c1=Fc1/vv, as damped coefficient c1Power F when for negative valuec1With 15 movement velocity v of pistonv
Direction it is identical, as damped coefficient c1For timing power Fc1With 15 movement velocity v of pistonvIt is contrary.
Preferably, 12 upper and lower surface of the first bearing plate for causing piezoelectric ceramic piece to make is vibrated in the step 2 and step 3
Voltage fluctuation, this voltage fluctuation are stored in battery 23 by energy storage circuit 22, and battery 23 gives the first damper 10
In 18 auxiliary power supply of first pressure controller 17 and second pressure controller, to reduce power consumption.
Claims (8)
1. it is a kind of based on adjust damp reduce vibration influence ambient enviroment vibrohammer, it is characterised in that: it include from up to
Under sequentially connected mass block, damping spring mixed structure, exciting hammer, the first helical spring；
The damping spring mixed structure include the second helical spring, third helical spring, the first damper, the second damper,
First bearing plate and the second bearing plate；At the top of the first damper top, the second damper and the second helical spring top part
It not being connect with mass block, first damper bottom and third helical spring bottom are connect with the first bearing plate top respectively,
First bearing plate, which is covered, hammers top into shape in exciting, second damper bottom and the second helical spring bottom respectively with the second bearing plate
Connection, the second bearing plate cover on third helical spring top.
2. it is according to claim 1 a kind of based on the vibrohammer for adjusting damping reduction vibration influence ambient enviroment, it is special
Sign is: first damper and the second damper are the damper of adjustable damped coefficient, and first damper can
To provide negative damping factor and positive damping coefficient, the positive damping coefficient show the power that damper provides and directional velocity on the contrary,
The power that the negative damping factor shows that damper provides is identical as directional velocity.
3. it is according to claim 2 a kind of based on the vibrohammer for adjusting damping reduction vibration influence ambient enviroment, it is special
Sign is: first damper includes force rod, piston, fluid cylinder, first pressure controller, second pressure controller and speed
Degree meter, the speedometer are attached on force rod, and the piston can be free to slide in fluid cylinder and fluid cylinder is divided into the first chamber
Room and second chamber, force rod pass through fluid cylinder outer wall and are fixedly connected with the piston, and first pressure controller and first chamber connect
Connect and can real-time control first chamber fluid pressure, second pressure controller connect with second chamber and can real-time control second
Chamber fluid pressure, the fluid in first chamber and second chamber cannot mutually circulate and all completely cut off with ambient atmosphere；It is described
First pressure controller and second pressure controller are all dynamic servo control Fluid pressure.
4. it is according to claim 1 a kind of based on the vibrohammer for adjusting damping reduction vibration influence ambient enviroment, it is special
Sign is: second damper is the MR damper or identical as the first damper structure of adjustable damping.
5. it is according to claim 1 a kind of based on the vibrohammer for adjusting damping reduction vibration influence ambient enviroment, it is special
Sign is: first bearing plate is piezoelectric ceramic piece and is furnished with energy storage circuit and battery, and the first bearing plate, energy are deposited
Storage road and battery are sequentially connected, the connection of first pressure controller and second pressure control in battery and the first damper
Device connection processed.
6. according to claim 1-5 a kind of based on the vibropile for adjusting damping reduction vibration influence ambient enviroment
The pile sinking process of hammer, it is characterised in that: it includes the following steps:
Step 1: stake being stood on above foundation soil vertically, from bottom to up by stake, fixture, the first helical spring, exciting hammer, damping
Spring mixed structure, mass block link together；
Step 2: starting exciting hammer inhibits exciting hammer to act on during the excited frequency of exciting hammer passes through ground resonant frequency
Exciting force on fixture, i.e., by adjusting the damped coefficient of the first damper and the second damper, so that damping spring be made to mix
Structure and mass block constitute vibration insulating system:
Each variable is defined as follows:
m1: exciting hammers quality into shape
m2: mass block quality
k1: the rigidity of the first helical spring
k2: the rigidity of the second helical spring in damping spring mixed structure
k3: the rigidity of third helical spring in damping spring mixed structure
c1: the damped coefficient that the first damper provides
c2: the damped coefficient that the second damper provides
K: the equivalent stiffness of damping spring mixed structure
C: the equivalent damping of damping spring mixed structure
F1: the exciting force on exciting hammer is acted on, there is F1=F0sin(ωt)
F0: for exciting force F1Amplitude
ω: for exciting force F1Frequency
T: for the time
A1: the amplitude of exciting hammer
F2: the first helical spring acts on the exciting force on fixture
Then it is respectively as follows: by damping spring mixed structure can be obtained in kinetics relation equivalent stiffness k and equivalent damping c
The amplitude A of exciting hammer can be obtained by kinetics relation1Are as follows:
Obviously when the amplitude A of exciting hammer1The exciting force F on fixture is acted on when=02It is 0, to make A1=0 requires damping bullet
The equivalent stiffness k=ω of spring mixed structure2m2Equivalent damping c=0 simultaneously, therefore the first damper damped coefficient c is adjusted in real time1
With the second damper damped coefficient c2, so thatAndHere the damped coefficient c of the first damper1Take the damping system of negative and the second damper
Number c2Positive value is taken, at this moment damping spring mixed structure and mass block constitute vibration insulating system, pass through ground in the excited frequency of exciting hammer
Play the role of that exciting hammer is inhibited to act on the exciting force on fixture during base resonant frequency, to reduce exciting hammer to surrounding
The influence of environment；
Step 3: when the excited frequency of exciting hammer rises to stable working frequency, by adjusting the first damper and the second damping
The damped coefficient of device, so that damping spring mixed structure and mass block be made to constitute power augmentation system:
The definition of each variable as shown in step 2, exciting hammer amplitude A1In expression formula:
If damping spring mixed structure and mass block is made to constitute power augmentation system, it is desirable that the denominator in above-mentioned expression formula is 0, this
The equivalent stiffness of Shi Yaoqiu damping spring mixed structureEquivalent damping c=0 simultaneously, therefore adjust in real time
Save the first damper damped coefficient c1With the second damper damped coefficient c2, so thatSimultaneouslyHere the first resistance
The damped coefficient c of Buddhist nun's device1Take the damped coefficient c of negative and the second damper2Positive value is taken, at this moment damping spring mixed structure and matter
Gauge block constitutes power augmentation system, and fixture is accelerated pile sinking by the exciting force maximum of the first helical spring.
7. a kind of pile sinking based on the vibrohammer for adjusting damping reduction vibration influence ambient enviroment according to claim 6
Method, it is characterised in that: the first damper damped coefficient c of the adjusting1Method be adjust first pressure controller and second
The pressure of controller, to make first chamber and second chamber to the resultant force F of pistonc1With piston movement speed vvRatio be equal to
Damped coefficient c1, i.e. c1=Fc1/vv, as damped coefficient c1Power F when for negative valuec1With piston movement speed vvDirection it is identical, work as resistance
Buddhist nun's coefficient c1Power F when for positive valuec1With piston movement speed vvIt is contrary.
8. a kind of pile sinking based on the vibrohammer for adjusting damping reduction vibration influence ambient enviroment according to claim 6
Method, it is characterised in that: vibration causes the first bearing plate upper and lower surface made of piezoelectric ceramic piece in the step 2 and step 3
Voltage fluctuation, this voltage fluctuation are stored in battery by energy storage circuit, and battery is to first in the first damper
Pressure controller and second pressure controller auxiliary power supply, to reduce power consumption.
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| CN109137912B (en) * | 2018-09-29 | 2020-09-29 | 浙江科技学院 | Variable-stiffness-based vibration pile hammer with resonance-free function and pile sinking method |
| CN109137911B (en) * | 2018-09-29 | 2020-09-29 | 浙江科技学院 | Magnetically driven vibratory pile hammer and pile sinking method |
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- 2017-11-16 CN CN201711133712.0A patent/CN107869140B/en active Active
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| GB2161731A (en) * | 1984-07-17 | 1986-01-22 | Serf Limited | Pile driver |
| CN2054047U (en) * | 1989-05-24 | 1990-03-07 | 北京市机械施工公司 | Three-section combined spring vibration absorber |
| CN2111966U (en) * | 1992-02-29 | 1992-08-05 | 建设部长沙建筑机械研究所 | Vibrating drop hammer buffer unit |
| CN2122887U (en) * | 1992-05-27 | 1992-11-25 | 建设部长沙建筑机械研究所 | Damping mechanism of light crane boom |
| CN202301734U (en) * | 2011-09-22 | 2012-07-04 | 株洲时代新材料科技股份有限公司 | Vertical base vibration isolation device and base vibration isolation system with same |
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| CN107869140A (en) | 2018-04-03 |
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