CN110409442A - It is a kind of to reduce the pile sinking process that vibration influences based on marmem - Google Patents
It is a kind of to reduce the pile sinking process that vibration influences based on marmem Download PDFInfo
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- CN110409442A CN110409442A CN201910691956.3A CN201910691956A CN110409442A CN 110409442 A CN110409442 A CN 110409442A CN 201910691956 A CN201910691956 A CN 201910691956A CN 110409442 A CN110409442 A CN 110409442A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 65
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000001133 acceleration Effects 0.000 claims description 38
- 239000011159 matrix material Substances 0.000 claims description 27
- 238000005253 cladding Methods 0.000 claims description 24
- 238000009413 insulation Methods 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 23
- 238000006073 displacement reaction Methods 0.000 claims description 21
- 239000000956 alloy Substances 0.000 claims description 16
- 230000006870 function Effects 0.000 claims description 14
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 13
- 238000004378 air conditioning Methods 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 9
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 7
- 206010037660 Pyrexia Diseases 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
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- 230000005284 excitation Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 8
- 241000282693 Cercopithecidae Species 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000003340 mental effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
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- Structural Engineering (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The pile sinking process that vibration influences is reduced based on marmem the invention discloses a kind of, vibrohammer when pile sinking includes marmem eccentric structure, heating device, rotary shaft, driving device and pedestal；The heating device includes alternating source, magnet exciting coil and heating sheet.In order to which excited frequency is increased to by zero and causes ambient environment vibrations excessive because passing through vibration hammer-stake-foundation System resonant frequency during working frequency when overcoming the problems, such as the starting of common vibrohammer, in order to all there is no eccentricity excitation power before allowing vibrohammer to reach working frequency, and vibrohammer just gradually generates eccentricity excitation power when reaching working frequency, and the pile sinking process that vibration influences is reduced based on marmem the present invention provides a kind of.
Description
Technical field
The invention belongs to the pile vibrosinking fields of geotechnical engineering, more particularly to a kind of reduced based on marmem to vibrate
The pile sinking process of influence.
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 vibration
Foundation vibration obviously increases when hammer-stake-foundation System resonant frequency, and excessive vibration especially can be caused to close to buildings in urban district
It is dynamic, therefore this vibration hammer is limited in the use in urban district.Therefore vibrohammer, i.e. multiple groups eccentric mass has also been developed in people
When block rotational frequency is near vibration hammer-stake-foundation System resonant frequency, the vertical and horizontal direction exciting of eccentric massblock generation
Power is cancelled out each other, and would not generate vibration to ground when eccentric massblock accelerates rotation to pass through resonant frequency in this way influences, and
Eccentric massblock revolving speed reach the horizontal direction exciting force that multiple groups eccentric massblock after stable working frequency generates cancel out each other and
Vertical exciting force is overlapped mutually, so that a vibration-sunk be driven to enter ground.This vibrohammer is because to close to buildings shadow
Ring very little, therefore application of succeeding in the intensive urban district of building, but this vibrohammer it is at high price and far more than
Common vibration hammer price.Therefore a kind of pile vibrosinking method is needed, vibrohammer has marmem eccentric structure,
The mass center of marmem eccentric structure marmem eccentric structure in rotating shaft center, heating can deform when room temperature
And its mass center deviates rotating shaft center, therefore during being gradually increased to working frequency by zero after vibrohammer starts, shape
Shape memory alloys eccentric structure keeps room temperature and will not generate eccentric force and add when the frequency of vibrohammer reaches working frequency
Hot marmem produces eccentric force, this eccentric force, that is, vibration hammer exciting force can pass through in this way to avoid because of initiation culture
Close to buildings is caused to vibrate excessive problem when vibration hammer-stake-foundation System resonant frequency.
Summary of the invention
The present invention in order to when common vibrohammer being overcome to start excited frequency by zero increase to during working frequency because
The problem passed through vibration hammer-stake-foundation System resonant frequency and cause ambient environment vibrations excessive, in order to allow vibrohammer to reach
All there is no eccentricity excitation power before to working frequency, and when vibrohammer reaches working frequency, just gradually generates eccentricity excitation power, this
Invention provides a kind of pile sinking process that vibration influence is reduced based on marmem.
Technical solution of the present invention: a kind of to reduce the pile sinking process that vibration influences based on marmem including following
Step:
Step 1: stake being stood on above foundation soil vertically, from bottom to up by stake, fixture, based on the vibration of marmem
Dynamic pile monkey links together, wherein the pedestal of the vibrohammer based on marmem is connected with fixture；
Vibrohammer includes marmem eccentric structure, heating device, rotary shaft, driving device and pedestal；It is described
Heating device includes heat source and heating sheet；Marmem eccentric structure is fixed on the rotary shaft, and heating sheet is fixed on rotation
On axis, driving device and rotation axis connection and driving rotary shaft rotation, driving device are fixedly connected with pedestal, and heating sheet can be in warm
The lower fever of source effect and heated shape memory alloy eccentric structure, not heated shape memory alloy eccentric structure in step 1；
Step 2: starting driving device, driving device drives rotary shaft to progressively increase to working speed from revolving speed for 0, at this
Marmem eccentric structure shows as first shape during a and its mass center is located at rotating shaft center；
Step 3: after rotary shaft rotating speed reaches working speed, starting heating device, at this moment marmem bias knot
Structure is heated to deform, and marmem eccentric structure shows as the second shape and its mass center deviates rotating shaft center, in this way
Marmem eccentric structure generates unbalanced centrifugal force, this unbalanced centrifugal force to rotary shaft in rotary course
That is exciting force, stake is in the effect of this exciting force sinks to burying；
Step 4: stake is sunk in soil after designated depth, closes heating device, at this moment marmem eccentric structure becomes again
First shape and mass center is located at rotating shaft center, at this moment marmem eccentric structure does not generate exciting force, then gradually drops
The revolving speed of low rotary shaft is to 0.
Preferably, it is connected between heating sheet and marmem eccentric structure with thermally conductive sheet, thermally conductive sheet and shape memory
Non-deformation portion connects in alloy eccentric structure, and thermally conductive sheet does not influence the deformation of marmem eccentric structure.
Preferably, the heat source of the heating device includes alternating source, magnet exciting coil, and alternating source is connected with magnet exciting coil
And it is passed through alternating current for magnet exciting coil, magnet exciting coil is fixed on the base, and alternating source is that magnet exciting coil is passed through alternating current
When, magnet exciting coil generates alternating magnetic field, and alternating magnetic field generates current vortex on heating sheet, and heating sheet is issued in current vortex effect
Heat and heated shape memory alloy eccentric structure；Or the heat source of heating device includes power supply, positive brush and cathode brush, electricity
Source anode is connect with positive brush, power cathode with and cathode brush connect, positive brush and cathode brush are fixed on the base,
Positive brush and cathode brush are contacted with the heating sheet of rotation, conductive exothermal when heating sheet contacts positive brush and cathode brush.
Preferably, the marmem eccentric structure has double process shape-memory effect, is first shape when room temperature,
The second shape is showed when heating, and the mass center of the second shape and the mass center of first shape be not in the same point.
Preferably, the driving device is motor or diesel engine.
Preferably, the memorial alloy eccentric structure and heating sheet are covered with insulation cladding, and insulation cladding bottom is connected with pedestal,
Rotary shaft is rotated across insulation cladding；Preferably, insulation cladding is furnished with air-conditioning cold air pump, is provided with cooling input hole and cooling on insulation cladding
Delivery outlet, the cold air that air-conditioning cold air pump generates is by cooling down input hole input again by cooling delivery outlet output.Preferably, insulation cladding
Material is containing bladdery ceramics, and insulation cladding inner wall is coated with titanium dioxide, can play heat-blocking action containing bladdery ceramics,
It can accelerate the temperature-rise period of marmem eccentric structure in step 3 in this way.Gas can only be defeated by cooling in insulation cladding
Enter hole and cooling delivery outlet and outside air circulates.Air-conditioning cold air pump generates cold air in step 4 and cold air is by cooling down input
Again by cooling delivery outlet output, cold air cools down to marmem eccentric structure in insulation cladding for hole input
Preferably, there is mass center fine tuning structure on heating sheet.The mass center fine tuning structure includes the first centroid position adjuster
With the second centroid position adjuster；And first centroid position adjuster and the second centroid position adjuster be mutually in that an angle of 90 degrees is placed
On heating sheet.First centroid position adjuster includes the first closure plate, the second closure plate, round tube, magnetostrictive bar, quality
Block, spring, coil and mass center finely tune power supply, first closure plate, spring, mass block, magnetostrictive bar and the second closure plate
It is sequentially connected and is located inside round tube, spring is fixedly connected with the first closure plate, magnetostrictive bar and the fixed company of the second closure plate
It connects, mass block can slide in round tube, and first closure plate and the second closure plate are fixedly connected with round tube respectively, the line
Circle is wrapped in circular tube external, and coil is connect with mass center fine tuning power supply；Second centroid position adjuster and the first centroid position are adjusted
The structure of device is identical.When mass center finely tunes power supply not to coil energization, heating sheet, the first centroid position adjuster and the second mass center
Total mass center of position control is in rotating shaft center.Spring rotation more closer than magnetostrictive bar when placing round tube, in round tube
Axis center.
Preferably, acceleration transducer is fixedly mounted on pedestal, the acceleration transducer is bidirectional acceleration sensing
Device can measure horizontal and vertical acceleration simultaneously.
Preferably, in step 3, start heating device, alternating source is that magnet exciting coil is passed through alternating current, and magnet exciting coil produces
Raw alternating magnetic field, heating sheet generate current vortex and fever under action of alternating magnetic field.
Preferably, vibrohammer uses in pairs when pile sinking, and the exciting force phase in the horizontal direction that each pair of vibrohammer generates
It mutually offsets and is vertically being overlapped mutually.In order to generate such vibrating effect, two in each pair of vibrohammer can be made to vibrate
The direction of rotation of pile monkey is opposite.
Preferably, when in step 4 marmem eccentric structure because residual deformation without reverting to the first shape completely
Shape and when mass center is not at rotating shaft center, if having mass center fine tuning structure on heating sheet, the mass center started on heating sheet is micro-
Structure is adjusted, changes the centroid position of the first centroid position adjuster and the second centroid position adjuster respectively, passes through in coil
Current induced magnetic field changes the position of mass block to change the length of magnetostrictive bar, is in this way 90 degree by changing
The position of the synthesis mass center of the first centroid position adjuster and the second centroid position adjuster that angle is placed, to offset shape note
Alloy eccentric structure is recalled because of the centrifugal force that generates when mass center is not at rotating shaft center.The acceleration measured by acceleration transducer
Degree may determine that whether vibrohammer generates exciting force, when marmem eccentric structure is because residual deformation is without completely extensive
Again for first shape and when mass center is not at rotating shaft center, then the acceleration measured is not zero, in this way by adjusting mass center
At this moment the position of mass center in fine tuning structure shows in mass center fine tuning structure until the acceleration that acceleration transducer measures is zero
The centrifugal force that mass center generates counteract marmem eccentric structure because generate when mass center is not at rotating shaft center from
Mental and physical efforts.
Preferably, adjusting the first centroid position adjuster and the second centroid position adjuster makes the acceleration that pedestal measures
0 process are as follows: the phase angle of rotary shaft rotation generation is set as a, the phase angle of the round tube of the first centroid position adjuster is b, the
The phase angle of the round tube of two centroid position adjusters is b+90, and the initial value of phase angle a and b is all 0 here and unit is angle,
If the acceleration measured is not 0, if the horizontal direction acceleration that t moment measures is Ax, vertical acceleration is Ay, the first mass center position is taken
The displacement adjustment factor for setting mass block in adjuster is C1, and the displacement adjustment factor of mass block is in the second centroid position adjuster
C2, then the mobile distance of mass block is C1. [Ax.cos (a)+Ay.sin (a)] in the first centroid position adjuster, then the second matter
The mobile distance of mass block is C2. [Ax.cos (a+90)+Ay.sin (a+90)] in heart position control；In different moments by upper
The mode of stating adjusts the position of mass block in the first centroid position adjuster and the second centroid position adjuster, until the acceleration of pedestal
Degree is 0.
Preferably, the mass center for making marmem eccentric structure is needed to be located at rotating shaft center in step 2 and step 4, from
Without generating exciting force, avoid causing to resonate when passing through hammer-stake-ground resonant frequency, but in speed change procedure,
Even if temperature-resistant, the centrifugal force that each point of marmem eccentric structure is subject in variation and causes shape to be remembered
The continuous subtle flow for recalling alloy eccentric structure, finally generates subtle exciting force at the slight change for leading to its mass center, so not
It can avoid causing to resonate when passing through hammer-stake-ground resonant frequency, in order to further suppress this subtle exciting force, here
Provide fining calculating and the suppressing method of this subtle exciting force:
Be related to it is some write a Chinese character in simplified form and symbol, the following are notes:
M: after marmem eccentric structure grid division, the number of nodes of each unit
Ni: the interpolating function defined on i-th of node of each unit, and be the function of each coordinate in unit, here 1
≤i≤m
ω: rotary shaft angular velocity of rotation
bx: active force of the gravity to any point in unit in the direction x
by: active force of the gravity to any point in unit in the direction y
Ω: element integral region
fix: to the direction the x equivalent load of the i-th node of unit,
fiy: to the direction the y equivalent load of the i-th node of unit,
{fe}: cell node power column vector, by fixAnd fiyIt is composed
uix,uiy: the direction x and y is displaced on each cell node, and 1≤i≤m
{ue}: Displacement of elemental node vector { ue, by uix,uiyCombination obtains
E: modulus
υ: Poisson's ratio
[D]: the relational matrix of stress and strain
[B]: the relational matrix for being displaced and straining on each unit
[B]T: the transposed matrix of [B]
[Ke]: by { feAnd { ueThe matrix that connects, there is [Ke]{ue}={ fe}
ux,uy: the displacement of any point (x, y) in the direction x and y in unit
Its expression formula is respectivelyWith
Active force of each unit after subtle flow to rotating shaft center in the direction x
Active force of each unit after subtle flow to rotating shaft center in the direction y
By the directed force F of all unitsx eIt is superimposed in the direction x, obtains marmem eccentric structure
The direction x active force because being generated after subtle flow at the same temperatureBy the active force of all unitsIt is folded in the direction y
It is added together, obtains y direction active force of the marmem eccentric structure at the same temperature because generating after subtle flow
Local coordinate system is established by origin of rotating shaft center for the marmem eccentric structure in step 2, and
To marmem eccentric structure grid division, each grid constitutes a unit, if each unit has m node, each
Interpolating function N is defined on nodei(1≤i≤m),NiIt is the function of any point coordinate (x, y) in unit, if rotary shaft rotation angle
Speed is ω, and active force of the gravity to any point in unit in the direction x is b in rotary coursex, the active force in the direction y be
by, unit area Ω is integrated to obtain because rotating the equivalent load to cell node:
To the direction the x equivalent load of the i-th node of unit:
To the direction the y equivalent load of the i-th node of unit:
By fixAnd fiyGroup is combined into cell node power column vector { fe, expression formula are as follows:
If the displacement of the direction x and y is respectively u on each cell nodeix,uiy(1≤i≤m), by uix,uiyCombination obtains unit
Modal displacement vector { ue, expression formula are as follows:
Modulus E and Poisson's ratio υ of the shape memory alloy material under Current Temperatures are obtained with torsion test by stretching, by
Modulus E and Poisson's ratio υ obtains the relational matrix [D] of stress and strain, if the relational matrix for being displaced and straining on each unit is
[B], [B]TFor the transposed matrix of [B], the matrix of each unit is obtained by integrating in unit area Ω[Ke] by { feAnd { ueConnect, it is shown below:
[Ke]{ue}={ fe} (1)
Each unit can list the equation as shown in formula (1), and the equation of all units all simultaneous can be solved together
Obtain the displacement components u on each cell node of marmem eccentric structureixAnd uiy(1≤i≤m), can be obtained in unit in this way
The displacement components u at any point (x, y)xAnd uy, expression formula is respectivelyWithThen it calculates each
Active force of the unit after subtle flow to rotating shaft center in the direction x and y be respectivelyWith
Active force of the unit in the direction x:
Active force of the unit in the direction y:
By the active force of all unitsWithIt is superimposed respectively in the direction x and the direction y, obtains shape memory conjunction
The golden eccentric structure active force because being generated after subtle flow at the same temperatureWithByWithExpression formula
It is found thatWithChange with angular velocity of rotation, therefore when the speed of rotary shaft is passed through near resonant frequency, in order to keep away
Exempting from resonance influences, and applies fine tuning power in real time to offsetWithInfluence.
Therefore the first centroid position adjuster and the second mass center position in mass center fine tuning structure being in an angle of 90 degrees placement can be used
Adjuster is set, is calculated by mass center fine tuning counteractingWith
The form of stress-strain relation matrix [D] is illustrated, if modulus is E, Poisson's ratio is that v takes KE=E/ [3 (1-
2v)], G=E/ [2 (1+v)], the then form of [D] are as follows:
Illustrate a kind of desirable interpolating function form of four node units such as Figure 10 (b) shown in and corresponding displacement with
Strain stress relation matrix [B], if the unit lower left corner is first node, other nodes press inverse time needle sort, and a is unit horizontal to length
Half, b is the half of unit vertical extension, establishes local coordinate system by origin of unit center, then each node i is corresponding slotting
Value function NiAre as follows:
N1=(x-a) (y-b)/4
N2=(x+a) (y-b)/4
N3=(x+a) (y+b)/4
N4=(x-a) (y+b)/4
[if N]1×4Expression formula are as follows: [N]1×4=[N1,N2,N3,N4], then it is displaced the expression formula with strain stress relation matrix [B]
Are as follows:
The beneficial effects of the invention are as follows excited frequencies when common vibrohammer being overcome to start to increase to working frequency by zero
The problem for causing ambient environment vibrations excessive because passing through vibration hammer-stake-foundation System resonant frequency in the process is shaken to allow
Dynamic pile monkey, which reaches before working frequency, does not all have eccentricity excitation power, and when vibrohammer reaches working frequency just gradually generates and eccentric swashs
Vibration power reduces the pile sinking process that vibration influences based on marmem the present invention provides a kind of.
Detailed description of the invention
Fig. 1 is primary structure and stake synergistic effect schematic diagram of the invention；
Fig. 2 is vibrohammer general structure schematic diagram of the invention；
Fig. 3 is the three dimensional structure diagram of marmem eccentric structure and heating dish in vibrohammer of the invention；
Fig. 4 is the side view of marmem eccentric structure and heating dish of the invention；
Fig. 5 is thermal-insulating casing structure schematic cross-section of the invention；
Fig. 6 is the deformation schematic diagram of marmem eccentric structure of the invention；
Fig. 7 is mass center fine tuning structure schematic diagram in heating dish of the invention
The structural schematic diagram of Fig. 8 the first centroid position adjuster
The round tube internal cross section schematic diagram of Fig. 9 the first centroid position adjuster
Figure 10 marmem eccentric structure grid division schematic diagram
1. ground in figure, 2., 3. fixtures, 4. vibrohammers, 5. vertically recycle direction of excitation, and 6. marmems are inclined
Core structure, 7. rotary shafts, 8. driving devices, 9. pedestals, 10. alternating sources, 11. magnet exciting coils, 12. heating sheets, 13. heat preservations
Shell, 14. air-conditioning cold air pumps, 15. cooling input holes, 16. cooling delivery outlets, 17. contain bladdery ceramics, and 18. titanium dioxide apply
Layer, 19. first centroid position adjusters, 20. second centroid position adjusters, 21. first closure plates, 22. second closure plates,
23. round tube, 24. magnetostrictive bars, 25. mass blocks, 26. springs, 27. coils, 28. mass centers finely tune power supply, 29. acceleration sensings
Device, 30. thermally conductive sheets, the grid that 31. marmem eccentric structures divide, Unit 32., 33. nodes
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.
The pile sinking process that vibration influences, the vibropile used are reduced based on marmem as a kind of in Fig. 1-Figure 10
Hammer 4, including marmem eccentric structure 6, heating device, rotary shaft 7, driving device 8 and pedestal 9；
The heating device as shown in Figure 2 includes alternating source 10, magnet exciting coil 11 and heating sheet 12；
Marmem eccentric structure 6 is fixed in rotary shaft 7, and heating sheet 12 is fixed in rotary shaft 7, driving device
8 connect with rotary shaft 7 and rotary shaft 7 are driven to rotate, and alternating source 10 and magnet exciting coil 11 are connected and be passed through for magnet exciting coil 11
Alternating current, driving device 8 are fixedly connected with pedestal 9, and magnet exciting coil 11 is fixed on pedestal 9；Alternating source 10 is excitation wire
When circle 11 is passed through alternating current, magnet exciting coil 11 generates alternating magnetic field, and alternating magnetic field generates current vortex on heating sheet 12, adds
Backing 12 generates heat under current vortex effect and heated shape memory alloy eccentric structure 6；
It is connected between heating sheet 12 and marmem eccentric structure 6 with thermally conductive sheet 30, thermally conductive sheet 30 and shape memory
Non-deformation portion connects in alloy eccentric structure 6, and thermally conductive sheet 30 does not influence the deformation of marmem eccentric structure 6；
The marmem eccentric structure 6 has double process shape-memory effect, the room temperature Shi Wei as shown in Fig. 6 (a)
One shape shows the second shape when heating as shown in Fig. 6 (b), and the mass center of the second shape and the mass center of first shape be not same
One point；
The driving device 8 is motor or diesel engine；
The memorial alloy eccentric structure 6 and heating sheet 12 are covered with insulation cladding 13, and 13 bottom of insulation cladding and pedestal 9 connect
It connects, rotary shaft 7 is rotated across insulation cladding 13；Insulation cladding 13 is furnished with air-conditioning cold air pump 14, is provided with cooling input hole on insulation cladding 13
15 with cooling delivery outlet 16, and the cold air that air-conditioning cold air pump 14 generates is defeated by cooling delivery outlet 16 again by cooling down the input of input hole 15
Out；The material of insulation cladding 13 is containing bladdery ceramic 17, and 13 inner wall of insulation cladding is coated with coating of titanium dioxide 18, contains bubble
Ceramics 17 can play heat-blocking action, the temperature-rise period of marmem eccentric structure 6 can be accelerated in this way；Insulation cladding 13
Interior gas can only be circulated by cooling input hole 15 and cooling delivery outlet 16 and outside air；
There is mass center fine tuning structure on heating sheet 12 as shown in Figure 7；The mass center fine tuning structure includes the first centroid position tune
Device 19 and the second centroid position adjuster 20 are saved, the first centroid position adjuster 19 includes the first closure plate 21, the second closure plate
22, round tube 23, magnetostrictive bar 24, mass block 25, spring 26, coil 27 and mass center finely tune power supply 28, first closure plate
21, spring 26, mass block 25, magnetostrictive bar 24 and the second closure plate 22 are sequentially connected and are located inside round tube 23, spring 26
It is fixedly connected with the first closure plate 21, magnetostrictive bar 24 is fixedly connected with the second closure plate 22, and mass block 25 can be in round tube
Sliding, first closure plate 21 and the second closure plate 22 are fixedly connected with round tube 23 respectively in 23, and the coil 27 is wrapped in
Outside round tube 23, coil 27 is connect with mass center fine tuning power supply 28；Second centroid position adjuster 20 and the first centroid position are adjusted
The structure of device 19 is identical, and the first centroid position adjuster 19 and the second centroid position adjuster 20 are mutually placed in an angle of 90 degrees
On heating sheet；When mass center finely tunes power supply 28 not to the energization of coil 27, heating sheet 12, the first centroid position adjuster 19 and second
Total mass center of centroid position adjuster 20 is at the center of rotary shaft 7；When placing round tube 23, the spring 26 in round tube 23 is stretched than mangneto
Contracting bar 24 is closer to the center of rotary shaft 7；
Acceleration transducer 29 is fixedly mounted on pedestal 9, the acceleration transducer 29 is Double direct acceleration sensor,
Horizontal and vertical acceleration can be measured simultaneously.
It is a kind of to reduce the pile sinking process that vibration influences based on marmem, include the following steps:
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, based on shape
The vibrohammer 4 of shape memory alloys links together, wherein the pedestal 9 and fixture 3 of the vibrohammer 4 based on marmem
Connection；
Step 2: starting driving device 8, driving device 8 drive rotary shaft 7 to progressively increase to working speed from revolving speed for 0,
Marmem eccentric structure 6 shows as the first shape as shown in Fig. 6 (a) in this process and its mass center is located at rotation
The center of axis 7；
Step 3: after 7 revolving speed of rotary shaft reaches working speed, alternating source 10 is that magnet exciting coil 11 is passed through alternating current,
Magnet exciting coil 11 generates alternating magnetic field, and heating sheet 12 generates current vortex and fever under action of alternating magnetic field, at this moment shape memory
Alloy eccentric structure 6 is heated to deform, marmem eccentric structure 6 show as the second shape as shown in Fig. 6 (b) and
Its mass center deviates the center of rotary shaft 7, and such marmem eccentric structure 6 generates not rotary shaft 7 in rotary course
The centrifugal force of balance, this unbalanced centrifugal force, that is, exciting force, stake 2 is in the effect of this exciting force sinks to burying；
Step 4: stake 2 is sunk in soil after designated depth, stop apply alternating magnetic field, air-conditioning cold air pump 14 generate cold air and
Cold air is exported by cooling delivery outlet 16 again by cooling down the input of input hole 15, and cold air is in insulation cladding 13 to marmem bias
Structure 6 cools down, and at this moment marmem eccentric structure 6 becomes first shape again and mass center is located at 7 center of rotary shaft, at this moment
Marmem eccentric structure 6 does not generate exciting force, then gradually decreases the revolving speed of rotary shaft 7 to 0；
Preferably, vibrohammer 4 uses in pairs when pile sinking 2, and the exciting force that each pair of vibrohammer 4 generates is in the horizontal direction
It cancels out each other and is vertically being overlapped mutually；In order to generate such vibrating effect, two in each pair of vibrohammer 4 can be made to shake
The direction of rotation of dynamic pile monkey 4 is opposite；
Preferably, when in step 4 marmem eccentric structure 6 because residual deformation without reverting to the first shape completely
When shape and mass center are not at the center of rotary shaft 7, if having mass center fine tuning structure on heating sheet 12, start on heating sheet 12
Mass center fine tuning structure, changes the length of magnetostrictive bar 24 in coil 27 by current induced magnetic field, and then changes matter
The position of gauge block 25 is adjusted by changing the first centroid position adjuster 19 placed in an angle of 90 degrees and the second centroid position in this way
The position of the synthesis mass center of device 20, thus when offsetting marmem eccentric structure 6 and being not at 7 center of rotary shaft because of mass center
The centrifugal force of generation；It may determine that whether vibrohammer 4 generates exciting force by the acceleration that acceleration transducer 29 measures, work as shape
Shape memory alloys eccentric structure 6 is because residual deformation without reverting to first shape and mass center is not in rotary shaft 7 completely
When the heart, then the acceleration measured is not zero, in this way the position by adjusting mass block 25 in mass center fine tuning structure, until acceleration
The acceleration that sensor 29 measures is zero, and the centrifugal force at this moment showing that mass block 25 generates in mass center fine tuning structure counteracts shape
Memorial alloy eccentric structure 6 is because of the centrifugal force that generates when mass center is not at 7 center of rotary shaft.
Preferably, the mass center for making marmem eccentric structure 6 is needed to be located at 7 center of rotary shaft in step 2 and step 4,
To not generate exciting force, avoid causing to resonate when the resonant frequency for passing through 4- 2- grounds 1 of hammer, but changed in speed
Cheng Zhong, even if temperature-resistant, the centrifugal force that each point of marmem eccentric structure 6 is subject to is changing and is causing
The continuous subtle flow of marmem eccentric structure 6, finally generates subtle exciting at the slight change for leading to its mass center
Power unavoidably causes to resonate when passing through the resonant frequency of 4- 2- grounds 1 of hammer in this way, subtle in order to further suppress this
Exciting force provides fining calculating and the suppressing method of this subtle exciting force here:
Be related to it is some write a Chinese character in simplified form and symbol, the following are notes:
M: after 6 grid division of marmem eccentric structure, the number of nodes of each unit
Ni: the interpolating function defined on i-th of node of each unit, and be the function of each coordinate in unit, here 1
≤i≤m
ω: 7 angular velocity of rotation of rotary shaft
bx: active force of the gravity to any point in unit in the direction x
by: active force of the gravity to any point in unit in the direction y
Ω: element integral region
fix: to the direction the x equivalent load of the i-th node of unit,
fiy: to the direction the y equivalent load of the i-th node of unit,
{fe}: cell node power column vector, by fixAnd fiyIt is composed
uix,uiy: the direction x and y is displaced on each cell node, and 1≤i≤m
{ue}: Displacement of elemental node vector { ue, by uix,uiyCombination obtains
E: modulus
υ: Poisson's ratio
[D]: the relational matrix of stress and strain
[B]: the relational matrix for being displaced and straining on each unit
[B]T: the transposed matrix of [B]
[Ke]: by { feAnd { ueThe matrix that connects, there is [Ke]{ue}={ fe}
ux,uy: the displacement of any point (x, y) in the direction x and y in unit
Its expression formula is respectivelyWith
Active force of each unit after subtle flow to rotating shaft center in the direction x
Active force of each unit after subtle flow to rotating shaft center in the direction y
By the active force of all unitsIt is superimposed in the direction x, obtains marmem eccentric structure
6 direction x active forces because being generated after subtle flow at the same temperature
By the active force of all unitsIt is superimposed in the direction y, obtains marmem eccentric structure 6
The direction y active force because being generated after subtle flow at the same temperature
Local coordinate system is established using 7 center of rotary shaft as origin for the marmem eccentric structure 6 in step 2,
And to 6 grid division 31 of marmem eccentric structure as shown in Figure 10 (a), each grid 31 constitutes a unit 32, if
Each unit 32 has m node 33, defines interpolating function N on each node 33i(1≤i≤m),NiIt is any point in unit 32
The function of coordinate (x, y), if 7 angular velocity of rotation of rotary shaft is ω, gravity is to any point in unit 32 in the side x in rotary course
To active force be bx, the direction y active force be by, 32 region Ω of unit is integrated to obtain because rotation is to cell node 33
Equivalent load:
To the direction the x equivalent load of 32 i-th node 33 of unit:
To the direction the y equivalent load of 32 i-th node 33 of unit:
In above two formula, there is 1≤i≤m；
By fixAnd fiyGroup is combined into 33 power column vector { f of cell nodee, expression formula are as follows:
If the displacement of the direction x and y is respectively u on each cell node 33ix,uiy(1≤i≤m), by uix,uiyCombination obtains list
First 33 motion vector { u of nodee, expression formula are as follows:
Modulus E and Poisson's ratio υ of the shape memory alloy material under Current Temperatures are obtained with torsion test by stretching, by
Modulus E and Poisson's ratio υ obtains the relational matrix [D] of stress and strain, if the relational matrix for being displaced and straining on each unit 32
For [B], [B]TFor the transposed matrix of [B], by integrating to obtain the matrix of each unit 32 in 32 region Ω of unit[Ke] by { feAnd { ueConnect, it is shown below:
[Ke]{ue}={ fe} (1)
Each unit 32 can list the equation as shown in formula (1), and equation all simultaneous of all units 32 together may be used
Solution obtains the displacement components u on each cell node 33 of marmem eccentric structure 6ixAnd uiy(1≤i≤m), can obtain in this way
The displacement components u of any point (x, y) into unit 32xAnd uy, expression formula is respectivelyWithSo
Calculating active force of each unit 32 after subtle flow to 7 center of rotary shaft in the direction x and y afterwards is respectivelyWith
Active force of the unit 32 in the direction x:
Active force of the unit 32 in the direction y:
By the active force of all units 32WithIt is superimposed respectively in the direction x and the direction y, obtains shape memory
The active force because being generated after subtle flow at the same temperature of alloy eccentric structure 6WithByWithTable
Up to formula it is found thatWithChange with angular velocity of rotation, therefore when the speed of rotary shaft 7 is passed through near resonant frequency, is
It avoids resonance from influencing, applies fine tuning power in real time to offsetWithInfluence.
Therefore the first centroid position adjuster 19 and the second mass center placed in mass center fine tuning structure in an angle of 90 degrees can be used
Position control 20 is calculated by mass center fine tuning counteractingWith
Claims (10)
1. a kind of reduce the pile sinking process that vibration influences based on marmem, it is characterised in that: include the following steps:
Step 1: stake being stood on above foundation soil vertically, from bottom to up by stake, fixture, based on the vibropile of marmem
Hammer links together, wherein the pedestal of the vibrohammer based on marmem is connected with fixture；
Vibrohammer includes marmem eccentric structure, heating device, rotary shaft, driving device and pedestal；The heating
Device includes heat source and heating sheet；Marmem eccentric structure is fixed on the rotary shaft, and heating sheet is fixed on the rotary shaft,
Driving device is with rotation axis connection and driving rotary shaft rotation, driving device are fixedly connected with pedestal, and heating sheet can be made in heat source
With lower fever and heated shape memory alloy eccentric structure, not heated shape memory alloy eccentric structure in step 1；
Step 2: starting driving device, driving device drives rotary shaft to progressively increase to working speed from revolving speed for 0, in this mistake
Marmem eccentric structure shows as first shape in journey and its mass center is located at rotating shaft center；
Step 3: after rotary shaft rotating speed reaches working speed, start heating device, at this moment marmem eccentric structure by
Heat deforms, and marmem eccentric structure shows as the second shape and its mass center deviates rotating shaft center, such shape
Memorial alloy eccentric structure generates unbalanced centrifugal force to rotary shaft in rotary course, this unbalanced centrifugal force swashs
Vibration power, stake is in the effect of this exciting force sinks to burying；
Step 4: stake is sunk in soil after designated depth, closes heating device, at this moment marmem eccentric structure becomes first again
Shape and mass center is located at rotating shaft center, at this moment marmem eccentric structure does not generate exciting force, then gradually decreases rotation
The revolving speed of shaft is to 0.
2. a kind of pile sinking process for being reduced vibration influence based on marmem according to claim 1, feature are existed
There is double process shape-memory effect in: the marmem eccentric structure, when room temperature is first shape, and when heating shows the
Two shapes, and the mass center of the second shape and the mass center of first shape be not in the same point.
3. a kind of pile sinking process for being reduced vibration influence based on marmem according to claim 1, feature are existed
In: the heat source of the heating device includes alternating source, magnet exciting coil, and alternating source connects with magnet exciting coil and is magnet exciting coil
It is passed through alternating current, magnet exciting coil is fixed on the base, and when alternating source is that magnet exciting coil is passed through alternating current, magnet exciting coil is produced
Raw alternating magnetic field, and alternating magnetic field generates current vortex on heating sheet, heating sheet generates heat under current vortex effect and heated shape
Memorial alloy eccentric structure is connected between heating sheet and marmem eccentric structure with thermally conductive sheet, thermally conductive sheet and shape note
Recall non-deformation portion in alloy eccentric structure to connect, thermally conductive sheet does not influence the deformation of marmem eccentric structure；Or add
The heat source of thermal includes that power supply, positive brush and cathode brush, positive pole connects with positive brush, power cathode and and is born
The connection of pole brush, positive brush and cathode brush are fixed on the base, and positive brush and cathode brush and the heating sheet of rotation connect
Touching, conductive exothermal when heating sheet contacts positive brush and cathode brush.
4. a kind of pile sinking process for being reduced vibration influence based on marmem according to claim 1, feature are existed
In: the memorial alloy eccentric structure and heating sheet are covered with insulation cladding, and insulation cladding bottom is connected with pedestal, and rotary shaft, which passes through, protects
Warm shell rotation；Insulation cladding is furnished with air-conditioning cold air pump, and cooling input hole and cooling delivery outlet are provided on insulation cladding, and air-conditioning cold air pump produces
Raw cold air is by cooling down input hole input again by cooling delivery outlet output；The material of insulation cladding is containing bladdery ceramics, and guarantor
Warm shell inner wall is coated with titanium dioxide, can play heat-blocking action containing bladdery ceramics, shape can be accelerated to remember in such step 3
Recall the temperature-rise period of alloy eccentric structure, in step 4 air-conditioning cold air pump generate cold air and cold air by cool down input hole input again by
Cooling delivery outlet output, cold air cool down to marmem eccentric structure in insulation cladding.
5. a kind of pile sinking process for being reduced vibration influence based on marmem according to claim 1, feature are existed
In: there is mass center fine tuning structure on heating sheet；The mass center fine tuning structure includes the first centroid position adjuster and the second mass center position
Set adjuster；And first centroid position adjuster and the second centroid position adjuster be mutually in that an angle of 90 degrees is placed on heating sheet.
6. a kind of pile sinking process for being reduced vibration influence based on marmem according to claim 5, feature are existed
In: the first centroid position adjuster includes the first closure plate, the second closure plate, round tube, magnetostrictive bar, mass block, spring, line
Circle and mass center finely tune power supply, first closure plate, spring, mass block, magnetostrictive bar and the second closure plate be sequentially connected and
Inside round tube, spring is fixedly connected with the first closure plate, and magnetostrictive bar and the second closure plate are fixedly connected, and mass block can
To slide in round tube, first closure plate and the second closure plate are fixedly connected with round tube respectively, and the coil is wrapped in circle
Outside pipe, coil is connect with mass center fine tuning power supply；The structure phase of second centroid position adjuster and the first centroid position adjuster
Together；When mass center finely tunes power supply not to coil energization, heating sheet, the first centroid position adjuster and the second centroid position adjuster
Total mass center in rotating shaft center；When placing round tube, spring in round tube is than magnetostrictive bar closer to rotating shaft center.
7. a kind of pile sinking process for being reduced vibration influence based on marmem according to claim 5, feature are existed
In: acceleration transducer is fixedly mounted on pedestal, the acceleration transducer is Double direct acceleration sensor, can be surveyed simultaneously
Measure horizontal and vertical acceleration.
8. a kind of pile sinking process for being reduced vibration influence based on marmem according to claim 7, feature are existed
In: when in step 4 marmem eccentric structure because residual deformation without reverting to first shape and mass center does not have completely
When positioned at rotating shaft center, if having mass center fine tuning structure on heating sheet, starts the mass center fine tuning structure on heating sheet, change respectively
Become the centroid position of the first centroid position adjuster and the second centroid position adjuster, divides in this way by changing in an angle of 90 degrees placement
The first centroid position adjuster and the second centroid position adjuster synthesis mass center position, to offset marmem
Eccentric structure is because of the centrifugal force that generates when mass center is not at rotating shaft center；The acceleration measured by acceleration transducer can be with
Judge whether vibrohammer generates exciting force, when marmem eccentric structure is because residual deformation without reverting to completely
One shape and when mass center is not at rotating shaft center, then the acceleration measured is not zero, and finely tunes tie by adjusting mass center in this way
At this moment the position of mass center in structure shows that mass center produces in mass center fine tuning structure until the acceleration that acceleration transducer measures is zero
Raw centrifugal force counteracts marmem eccentric structure because of the centrifugal force that generates when mass center is not at rotating shaft center.
9. a kind of pile sinking process for being reduced vibration influence based on marmem according to claim 8, feature are existed
In: adjust the process for the acceleration 0 that the first centroid position adjuster and the second centroid position adjuster measure pedestal are as follows: set
The phase angle that rotary shaft rotation generates is a, and the phase angle of the round tube of the first centroid position adjuster is b, the second centroid position tune
The phase angle for saving the round tube of device is b+90, and the initial value of phase angle a and b is all 0 here and unit is angle, if the acceleration measured
Degree is not 0, if the horizontal direction acceleration that t moment measures is Ax, vertical acceleration is Ay, takes matter in the first centroid position adjuster
The displacement adjustment factor of gauge block is C1, and the displacement adjustment factor of mass block is C2 in the second centroid position adjuster, then the first matter
The mobile distance of mass block is C1. [Ax.cos (a)+Ay.sin (a)] in heart position control, then the second centroid position adjuster
The mobile distance of middle mass block is C2. [Ax.cos (a+90)+Ay.sin (a+90)]；Is adjusted in a manner described in different moments
The position of mass block in one centroid position adjuster and the second centroid position adjuster, until the acceleration of pedestal is 0.
10. a kind of pile sinking process for being reduced vibration influence based on marmem according to claim 1, feature are existed
In: need the mass center for making marmem eccentric structure to be located at rotating shaft center in step 2 and step 4, to not generate exciting
Power avoids causing to resonate when passing through hammer-stake-ground resonant frequency, but in speed change procedure, even if temperature is not
Become, the centrifugal force that each point of marmem eccentric structure is subject to is changing and causing marmem eccentric
The continuous subtle flow of structure, finally generates subtle exciting force at the slight change for leading to its mass center, is unavoidably wearing in this way
More hammer-stake-ground resonant frequency when cause to resonate, in order to further suppress this subtle exciting force, it is thin to provide this here
The fining calculating of micro- exciting force and suppressing method:
Be related to it is some write a Chinese character in simplified form and symbol, the following are notes:
M: after marmem eccentric structure grid division, the number of nodes of each unit
Ni: the interpolating function defined on i-th of node of each unit, and be the function of each coordinate in unit, here 1≤i≤
m
ω: rotary shaft angular velocity of rotation
bx: active force of the gravity to any point in unit in the direction x
by: active force of the gravity to any point in unit in the direction y
Ω: element integral region
fix: to the direction the x equivalent load of the i-th node of unit,
fiy: to the direction the y equivalent load of the i-th node of unit,
{fe}: cell node power column vector, by fixAnd fiyIt is composed
uix,uiy: the direction x and y is displaced on each cell node, and 1≤i≤m
{ue}: Displacement of elemental node vector { ue, by uix,uiyCombination obtains
E: modulus
υ: Poisson's ratio
[D]: the relational matrix of stress and strain
[B]: the relational matrix for being displaced and straining on each unit
[B]T: the transposed matrix of [B]
[Ke]: by { feAnd { ueThe matrix that connects, there is [Ke]{ue}={ fe}
ux,uy: in unit any point (x, y) in the displacement in the direction x and y, its expression formula is respectivelyWith
Active force of each unit after subtle flow to rotating shaft center in the direction x
Active force of each unit after subtle flow to rotating shaft center in the direction y
By the active force of all unitsIt is superimposed in the direction x, obtains marmem eccentric structure same
The direction x active force at a temperature of one because being generated after subtle flow
By the active force of all unitsIt is superimposed in the direction y, obtains marmem eccentric structure same
The direction y active force at a temperature of one because being generated after subtle flow
Local coordinate system is established by origin of rotating shaft center for the marmem eccentric structure in step 2, and to shape
Shape memory alloys eccentric structure grid division, each grid constitutes a unit, if each unit has m node, each node
Upper definition interpolating function Ni(1≤i≤m),NiIt is the function of any point coordinate (x, y) in unit, if rotary shaft angular velocity of rotation
For ω, active force of the gravity to any point in unit in the direction x is b in rotary coursex, the direction y active force be by, right
Unit area Ω integrates to obtain because rotating the equivalent load to cell node:
To the direction the x equivalent load of the i-th node of unit:
To the direction the y equivalent load of the i-th node of unit:
By fixAnd fiyGroup is combined into cell node power column vector { fe, expression formula are as follows:
If the displacement of the direction x and y is respectively u on each cell nodeix,uiy(1≤i≤m), by uix,uiyCombination obtains cell node
Motion vector { ue, expression formula are as follows:
Modulus E and Poisson's ratio υ of the shape memory alloy material under Current Temperatures are obtained with torsion test by stretching, by modulus
E and Poisson's ratio υ obtains the relational matrix [D] of stress and strain, if the relational matrix for being displaced and straining on each unit is [B],
[B]TFor the transposed matrix of [B], the matrix of each unit is obtained by integrating in unit area Ω
[Ke] by { feAnd { ueConnect, it is shown below:
[Ke]{ue}={ fe} (1)
Each unit can list the equation as shown in formula (1), and the equation of all units all simultaneous can be solved to obtain together
Displacement components u on each cell node of marmem eccentric structureixAnd uiy(1≤i≤m) can be obtained any in unit in this way
The some displacement components u of (x, y)xAnd uy, expression formula is respectivelyWithThen each unit is calculated
Active force after subtle flow to rotating shaft center in the direction x and y is respectivelyWith
Active force of the unit in the direction x:
Active force of the unit in the direction y:
By the active force of all unitsWithIt is superimposed respectively in the direction x and the direction y, it is inclined to obtain marmem
The core structure active force because being generated after subtle flow at the same temperatureWithByWithExpression formula it is found thatWithChange with angular velocity of rotation, therefore when the speed of rotary shaft is passed through near resonant frequency, in order to avoid resonance
It influences, applies fine tuning power in real time to offsetWithInfluence.
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| CN111336625A (en) * | 2020-03-13 | 2020-06-26 | 王慧娟 | Safety protection system capable of adjusting temperature in building |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1419018A (en) * | 2002-12-26 | 2003-05-21 | 夏斌 | Eccentric device for vibration piling hammer |
| CN2633439Y (en) * | 2003-08-19 | 2004-08-18 | 车仁炜 | Variable eccentric actuator of heavy pile-drawer |
| JP2018034080A (en) * | 2016-08-29 | 2018-03-08 | 調和工業株式会社 | Exciter and construction method of pile |
| CN109137911A (en) * | 2018-09-29 | 2019-01-04 | 浙江科技学院 | The vibrohammer and pile sinking process of mangneto driving |
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2019
- 2019-07-30 CN CN201910691956.3A patent/CN110409442B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1419018A (en) * | 2002-12-26 | 2003-05-21 | 夏斌 | Eccentric device for vibration piling hammer |
| CN2633439Y (en) * | 2003-08-19 | 2004-08-18 | 车仁炜 | Variable eccentric actuator of heavy pile-drawer |
| JP2018034080A (en) * | 2016-08-29 | 2018-03-08 | 調和工業株式会社 | Exciter and construction method of pile |
| CN109137911A (en) * | 2018-09-29 | 2019-01-04 | 浙江科技学院 | The vibrohammer and pile sinking process of mangneto driving |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111336625A (en) * | 2020-03-13 | 2020-06-26 | 王慧娟 | Safety protection system capable of adjusting temperature in building |
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