EP2194191A1 - Vibrationsmechanismus für eine Pfahlramme und Pfahlramme - Google Patents
Vibrationsmechanismus für eine Pfahlramme und Pfahlramme Download PDFInfo
- Publication number
- EP2194191A1 EP2194191A1 EP08170711A EP08170711A EP2194191A1 EP 2194191 A1 EP2194191 A1 EP 2194191A1 EP 08170711 A EP08170711 A EP 08170711A EP 08170711 A EP08170711 A EP 08170711A EP 2194191 A1 EP2194191 A1 EP 2194191A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- fluid
- vibration
- vibratory mechanism
- vibration member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
- B06B1/183—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with reciprocating masses
Definitions
- the invention relates to a vibratory mechanism for a pile driver comprising a static part and a dynamic part being movable with respect to the static part.
- Such a vibratory mechanism is known from US 5,088,565 .
- the static part of the prior art mechanism is attached to a cable of a crane and the dynamic part comprises jaws for clamping a pile to be driven, into the ground or to be extracted out of the ground.
- the dynamic part is provided with a pair of eccentrically rotatable weights which can be rotatably driven by a hydraulic motor. The weights rotate in opposite directions with respect to each other resulting in a vertical vibration of the dynamic part.
- a disadvantage of the known mechanism is that bearings of the rotatable weights are heavily loaded resulting in relatively high operational costs due to maintenance and replacement of the bearings.
- the object of the invention is to provide a simple and robust vibratory mechanism.
- the mechanism according to the invention which is characterized in that the static part is provided with a drivable crankshaft and the dynamic part comprises a housing and a vibration member being drivably coupled to the crankshaft through a connecting rod and linearly movable with respect to the housing in a direction of vibration, wherein said housing is resiliently coupled to the vibration member.
- the vibration member Upon driving the crankshaft the vibration member will vibrate linearly with respect to the housing of the dynamic part. Due to the resilient coupling between the vibration member and the housing, the housing of the dynamic part will vibrate as well. In case the vibratory mechanism is applied in a pile driver the housing of the dynamic part may be provided with clamping means for clamping a pile.
- the mechanism according to the invention provides the opportunity to select the rotation speed of the crankshaft, the weights of the vibration member and the housing and the degree of resiliency between the vibration member and the housing such that the dynamic part vibrates at a certain frequency, whereas transfer of inertia forces in the mechanism via the crankshaft to the remainder of the static part is minimized.
- reciprocating forces of the first order can be used to balance the vibrational forces of the housing of the dynamic part on the crankshaft under certain conditions. This means that forces on crankshaft bearings in the static part are minimized, hence reducing wear and operational costs.
- reciprocating forces of the first order is typically used in case of balancing reciprocating piston-crank-connecting rod mechanisms, such as present in internal combustion engines, in order to indicate inertial forces of the piston acting in the direction of piston movement and occurring at the frequency of rotation of the crank.
- crank-connecting rod mechanism can be built in a compact way compared to a conventional dynamic part comprising oppositely rotating weights, since in the latter case at least two rotatable weights must be located next to each other as seen in horizontal direction so as to achieve a vertical vibration.
- sudden peak forces on the housing are not directly transferred to the vibration member and the static part.
- a sudden peak force may typically happen in a pile driver if a pile is fixed to the housing to be driven into the ground and the pile touches a rigid layer or a stone or the like.
- the resulting so-called rebound effect is smoothly transferred to the static part by the mechanism according to the invention.
- the housing may be resiliently coupled to the vibration member via a fluid spring.
- a fluid spring An advantage of a fluid spring is that its spring characteristics can be influenced by modifying its fluid properties.
- the vibration member is a piston and the housing comprises a cylinder within which the piston is slidable, and the fluid spring is formed by a fluid chamber being present between the piston and the cylinder.
- the fluid chamber functions as a fluid spring.
- the fluid spring is formed by two fluid chambers located at opposite sides of the piston. This provides more flexibility in influencing the spring characteristics of the resiliency between the piston and the cylinder.
- the fluid chambers may be allowed to communicate with each other through a controllable valve.
- a controllable valve When opening the valve and moving the piston within the cylinder the fluid will flow from the fluid chamber of which the volume reduces to the fluid chamber of which the volume increases. If the valve is open such that no compression/expansion occurs in the fluid chambers the spring characteristics created by the fluid chambers are negligible. This may be desired under certain conditions, for example in case of a pile driver which is starting-up. In that case the housing should not be driven before the piston vibration has reached a certain frequency.
- the valve When the valve is open the piston may vibrate within the cylinder without driving the housing of the dynamic part.
- the valve may be closed at a piston frequency exceeding for example 1200 rpm, such that the starting-up period during which the frequency of the housing of the dynamic part is relatively low, is short.
- the fluid chambers communicate with the ambient air through a controllable valve during the starting-up period.
- the mechanism comprises at least two vibration members, wherein the mechanism is adapted such that under operating conditions the vibration members can be driven in opposite directions, for example in counter phase.
- This allows the opportunity to increase the vibration frequency of the vibration members to a relatively high level, for example the operational frequency in case of a pile driver, whereas the vibration of the housing in the direction of vibration remains negligible, because the forces of the oppositely moving vibration members on the housing via the resiliency can be balanced.
- the characteristics of the resiliency between the housing and the vibration members can be varied. Due to this feature the resiliency can be adjusted such that the counter force, of the resiliency on the vibration members at least partly reduce the inertia forces of the vibration members on the static part during the increase of the vibration frequency of the vibration members whereas the vibration of the housing remains negligible.
- the mechanism can be set such that the vibration members move synchronously in the same direction. In practice, during increase of the frequency the resiliency will be adjusted to a stiffer level.
- the vibrating members are pistons moving oppositely in corresponding cylinders and the resiliency is formed by the fluid chambers located at opposite sides of each of the pistons
- the fluid pressure in the fluid chambers can be increased during the period of increasing the frequency of the reciprocating speed of the pistons in order to reduce the reciprocating inertial forces of the pistons on the static part.
- the fluid chamber of one cylinder can communicate with the fluid chamber of the other cylinder such that under operating conditions a decreasing fluid chamber volume in one cylinder can communicate with an increasing fluid chamber volume in the other cylinder.
- the fluid chambers can be connected to each other in fluid communication which means that the piston in one cylinder pushes the fluid from the fluid chamber in that cylinder to the fluid chamber of the other cylinder, whereas the piston of the other cylinder synchronously sucks the fluid from the one cylinder.
- the pistons vibrate within the cylinders without driving the housing of the dynamic part.
- two cylinders may be disposed parallel to each other and the fluid chambers at the same side of the pistons can be connected to each other.
- the pistons can be driven in counter phase such that the volumes of the mutually connected fluid chambers at the same side of the pistons also vary in counter phase.
- the sum of the volumes of the connected fluid chambers substantially remains the same.
- the fluid communication can be effected by a controllable valve or the like.
- the mechanism may comprise adjusting means for adjusting the stroke of the vibration member with respect to the eccentricity of the crankshaft in order to minimize the amplitude of the vibration member during a starting-up period.
- the fluid spring can communicate with compressing means for increasing or decreasing the pressure of the fluid in the fluid spring. This feature provides the opportunity to influence the amplitude of the housing, for example. A variable pressure, depending on the operation frequency is also conceivable.
- the housing of the dynamic part and the static part may be connected to each other via a spring and/or a damper so as to create a coupling between the static part and the dynamic part in addition to the coupling via the connecting rod, and to reduce any transfer of vibrations from the dynamic part to the static part.
- a first part of the connecting rod is guided by a crosshead guide in the static part or in the dynamic part and a second part thereof being fixed to the vibration member is movable along its longitudinal centre line only. This means that the second part has a one-dimensional motion in the direction of vibration of the vibration member.
- the vibration speed of the vibration member, the weight of the housing and the characteristics of the resiliency between the housing and the vibration member are selected such that the vibration member and the housing substantially vibrate in counter phase under operating conditions, and the weight of the vibration member is selected such that its inertia force of the first order substantially balances the inertia force of the housing.
- the weight of the vibration member and the housing may be selected first and the characteristics of the resiliency between the housing and the vibration member is then adjusted to optimize the functioning of the mechanism.
- the characteristics of the resiliency can be influenced by the volume of the fluid chamber in case of a fluid spring.
- the invention is also related to a pile driver comprising a vibratory mechanism as described hereinbefore.
- the static part of the vibratory mechanism may be provided with driving means for driving the crankshaft.
- driving means for driving the crankshaft. This is advantageous in terms of mobility compared to a mobile pile driver of which the driving means are located on the ground. This is also advantageous in terms of efficiency and reduced complexity with respect to conventional pile drivers in which hydraulic systems are used and power must be transmitted from a power supply on the ground to the static part.
- the driving means is an internal combustion engine.
- Fig. 1 is a schematic view of an embodiment of the vibratory mechanism according to the invention.
- Fig. 2 is a perspective view of an alternative embodiment of the vibratory mechanism of Fig. 1 .
- Fig. 3 is a similar view as Fig. 1 of an alternative embodiment on a smaller scale.
- Fig. 1 shows an embodiment of the vibratory mechanism 1 according to the invention.
- the vibratory mechanism 1 is part of a pile driver in this example, but may be suitable for alternative technical devices.
- the vibratory mechanism 1 as shown in Fig. 1 comprises a static part 2 and a dynamic part 3.
- the dynamic part 3 is movable with respect to the static part 2.
- the static part 2 is provided with a lifting eye 4. In a pile driver the lifting eye 4 suspends from a cable of a crane (not shown).
- the dynamic part 3 is provided with a pair of clamps 5 for clamping a pile to be driven into the ground or to be extracted out of the ground.
- the pair of clamps 5 may be driven mechanically, hydraulically or the like.
- the dynamic part 3 oscillates in vertical direction at a predetermined frequency and with a predetermined amplitude with respect to the static part 2.
- Fig. 1 shows that the static part 2 is provided with a drivable crankshaft 6.
- the crankshaft 6 comprises two crankpins located eccentrically with respect to the centre line of the crankshaft 6.
- the dynamic part 3 is provided with two pistons 7 as vibration members.
- Each of the pistons 7 is coupled to the crankshaft 6 through a connecting rod 8.
- the connecting rod 8 comprises a first part 9 which is guided by a crosshead guide 10 in the static part 2, and a second part 11 which is movable along its longitudinal centre line only.
- the piston 7 is fixed to the second part 11.
- a through hole in the dynamic part 3 through which the second part 11 of the connecting rod 8 moves up and down may have the shape of the cross-sectional area of the second part 11 and the dimensions of the cross-sectional area of the through hole may be slightly larger than those of the second part 11.
- crankshaft 6 is driven by an internal combustion engine 12.
- Alternative driving means are conceivable, for example a hydraulic or electric motor.
- An advantage of applying the internal combustion engine 12 is that it can be used as stand-alone unit in the static part 2.
- the dynamic part 3 further comprises a housing in the form of cylinders 13 which function as guides for guiding the pistons 7.
- the cylinders 13 have a fixed position with respect to the dynamic part 3.
- the pistons 7 are slidable within the cylinders 13.
- the cylinders 13 are filled with a fluid, for example air.
- the piston 7 divides the cylinder space into two fluid chambers 14, 15 located at opposite sides of the piston 7. If the fluid chambers 14, 15 are closed spaces or nearly closed spaces, they form a fluid spring.
- the housing of the dynamic part 3 or the cylinder 13 is resiliently coupled to the piston 7.
- the fluid chambers 14, 15 form a gas spring.
- the fluid spring characteristics can be adjusted by modifying the fluid properties in the fluid chambers 14, 15.
- the fluid chambers 14, 15 can communicate with each other through a controllable valve 16.
- the valve 16 When the valve 16 is fully opened the fluid chambers 14, 15 communicate with each other. This means that in case of a downward displacement of the piston 7 the fluid from the lower fluid chamber 15 is pressed to the upper fluid chamber 14 via the valve 16. In that case the housing of the dynamic part 3 or the cylinder 13 will not follow the displacement of the piston 7.
- the valve 16 is closed and the piston 7 is displaced downwardly the fluid in the lower fluid chamber 15 will be compressed and the fluid in the upper fluid chamber 14 will be expanded. As a result the cylinder 13 will follow this displacement in downward direction.
- the housing of the dynamic part 3 will 3 will follow the piston movement at a certain phase shift, comparable to a conventional spring-mass system.
- the valve 16 can also be used in case of starting-up the vibratory mechanism 1. In case of driving a pile into the ground it may be desired to avoid low frequency vibrations which might occur during a starting-up period of the mechanism 1. This can be avoided by opening the valve 16 during increase of frequency of the piston 7 such that the housing of the dynamic part 3 remains in a non-vibration mode. Once a predetermined desired frequency has been reached the valve 16 is closed and the starting-up period of vibration of the housing of the dynamic part 3 up to its desired frequency is relatively short.
- an adjusting mechanism (not shown) for adjusting the piston stroke with respect to the eccentricity of the crankshaft 6 may be present.
- the spring characteristics of the fluid chambers 14, 15 can be influenced by varying the pressure of the fluid. This can be achieved by applying a compressor (not shown) which increases or decreases the fluid pressure in the fluid chambers 14, 15 via a press line 17.
- fluid chambers 14, 15 can communicate with each other. It is also possible to vent the fluid chambers 14, 15 to the ambient air during the starting-up period, such that pressure build-up in the fluid chambers 14, 15 is negligible.
- the vibratory mechanism 1 further comprises springs 18 to hold the static part 2 and the dynamic part 3 at a substantially constant distance with respect to each other.
- the spring 18 may also have damping characteristics to eliminate any residual vibrations between the static part 2 and the dynamic part 3.
- Fig. 2 shows an alternative embodiment of the vibratory mechanism 1 as part of a pile driver.
- the reference signs of the embodiment of Fig. 2 refer to similar components as being present in the embodiment of Fig. 1 .
- the embodiment as shown in Fig. 2 is provided with a single piston 7. This provides the opportunity to design a compact vibratory mechanism 1 as seen in a direction perpendicular to the direction of vibration of the piston 7.
- Fig. 3 shows another alternative embodiment, which is provided with four pistons 7 in line.
- the reference signs in Fig. 3 refer to corresponding components as shown in Fig. 1 .
- each piston 7 is coupled to a separate crankshaft 6a-6d.
- Two inner crankshafts 6b, 6c located between two outer crankshafts 6a, 6d are driven by the internal combustion engine 12 via a first transmission 19 and the outer crankshafts 6a, 6d are driven via a second transmission 20.
- the first and second transmissions 19, 20 are controlled such that the two inner pistons 7 located in the middle of the dynamic part 3 are moving in counter phase with respect to the two outer pistons 7 located at the outer sides of the dynamic part 3, as indicated by arrows in Fig.
- the first and/or second transmission 19, 20 can be controlled such that the movement of the inner pistons 7 is opposite to the movement of the outer pistons 7, whereas the crankshafts 6a-6d remain running at the operational frequency.
- the crosshead guide 10 is disposed in the dynamic part 3.
- the advantage of this configuration is that it improves the flexibility of mutual displacement of the static part 2 with respect to the dynamic part 3.
- the piston is resiliently coupled to the housing of the dynamic part through a mechanical spring instead of a fluid spring.
- the crankshaft may be replaced by an alternative shaft including an eccentric to which the connecting rod can be pivotally mounted.
- the mechanism is not only suitable for pile drivers, but it can be applied in alternative devices, for example for inserting elements into the ground by vibration, for compacting soils, cement, concrete, asphalt or the like.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08170711A EP2194191A1 (de) | 2008-12-04 | 2008-12-04 | Vibrationsmechanismus für eine Pfahlramme und Pfahlramme |
US13/132,988 US20110240323A1 (en) | 2008-12-04 | 2009-12-02 | vibratory mechanism for a pile driver and a pile driver |
EP09765087A EP2370642A1 (de) | 2008-12-04 | 2009-12-02 | Vibrationsmechanismus für eine pfahlramme und pfahlramme |
PCT/EP2009/066244 WO2010063764A1 (en) | 2008-12-04 | 2009-12-02 | A vibratory mechanism for a pile driver and a pile driver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08170711A EP2194191A1 (de) | 2008-12-04 | 2008-12-04 | Vibrationsmechanismus für eine Pfahlramme und Pfahlramme |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2194191A1 true EP2194191A1 (de) | 2010-06-09 |
Family
ID=40283722
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08170711A Withdrawn EP2194191A1 (de) | 2008-12-04 | 2008-12-04 | Vibrationsmechanismus für eine Pfahlramme und Pfahlramme |
EP09765087A Withdrawn EP2370642A1 (de) | 2008-12-04 | 2009-12-02 | Vibrationsmechanismus für eine pfahlramme und pfahlramme |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09765087A Withdrawn EP2370642A1 (de) | 2008-12-04 | 2009-12-02 | Vibrationsmechanismus für eine pfahlramme und pfahlramme |
Country Status (3)
Country | Link |
---|---|
US (1) | US20110240323A1 (de) |
EP (2) | EP2194191A1 (de) |
WO (1) | WO2010063764A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021075971A1 (en) | 2019-10-18 | 2021-04-22 | Cape Holland Holding B.V. | Vibrating system and method for inserting a foundation element into the ground using flexible elements |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013136138A1 (en) * | 2012-03-15 | 2013-09-19 | Ozkan Aydin | A variable moment resonance-free vibro hammer |
DE102014016400B4 (de) * | 2014-11-07 | 2019-01-17 | Thyssenkrupp Ag | Vibrationsrammanordnung mit integriertem Antriebsaggregat |
US11338326B2 (en) * | 2019-04-07 | 2022-05-24 | Resonance Technology International Inc. | Single-mass, one-dimensional resonant driver |
CN114351704B (zh) * | 2021-12-30 | 2022-11-18 | 徐州倍思特自动化工程有限公司 | 一种防偏移自锁微调式市政工程打桩装置 |
CN114354250A (zh) * | 2022-01-04 | 2022-04-15 | 屠文水 | 一种建筑工程和道路工程质量检测设备及检测方法 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1100918A (en) * | 1965-03-24 | 1968-01-24 | Albert George Bodine | Oscillator means for a vibratory pile driver |
SU631597A1 (ru) * | 1977-04-19 | 1978-11-05 | Protsko Anatolij A | Вибромолот |
JPS5729730A (en) * | 1980-07-31 | 1982-02-17 | Kazuo Murazaki | Vibrohammer |
GB2095731A (en) * | 1981-03-28 | 1982-10-06 | Schmidt Paul | Apparatus for driving and extracting sheet piles and other members |
SU1481325A1 (ru) * | 1986-06-09 | 1989-05-23 | Ленинградское Высшее Военное Инженерное Строительное Краснознаменное Училище Им.Ген.Армии А.Н.Комаровского | Вибромолот |
US5088565A (en) | 1990-03-23 | 1992-02-18 | J & M Hydraulic Systems, Inc. | Vibratory pile driver |
SU1730359A2 (ru) * | 1990-01-22 | 1992-04-30 | Ленинградское высшее военное инженерное строительное Краснознаменное училище им.генерала армии А.Н.Комаровского | Вибромолот |
CN2818553Y (zh) * | 2005-01-31 | 2006-09-20 | 中南大学 | 液压振动沉拔桩机调矩装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1954411A (en) * | 1930-07-25 | 1934-04-10 | Alfred A Heitzman | Pneumatic hammer |
US3054463A (en) * | 1958-01-24 | 1962-09-18 | Albert G Bodine | Acoustic apparatus for driving piles |
US3277970A (en) * | 1965-03-30 | 1966-10-11 | Albert G Bodine | Sonic driver with pneumatic capacitance |
US3344874A (en) * | 1965-05-28 | 1967-10-03 | Albert G Bodine | Low-impedance isolator for vibratory pile driver machines |
US3996912A (en) * | 1971-05-06 | 1976-12-14 | Allis-Chalmers Corporation | Low compression ratio diesel engine |
US3869003A (en) * | 1971-12-25 | 1975-03-04 | Sanwa Kizai Co Ltd | Pile drivers |
ATE31334T1 (de) * | 1983-09-19 | 1987-12-15 | Simson & Partner | Vorrichtung zum rammen und ziehen. |
WO1999005363A1 (en) * | 1997-07-23 | 1999-02-04 | Hydroacoustics, Inc. | Vibratory pavement breaker |
-
2008
- 2008-12-04 EP EP08170711A patent/EP2194191A1/de not_active Withdrawn
-
2009
- 2009-12-02 US US13/132,988 patent/US20110240323A1/en not_active Abandoned
- 2009-12-02 EP EP09765087A patent/EP2370642A1/de not_active Withdrawn
- 2009-12-02 WO PCT/EP2009/066244 patent/WO2010063764A1/en active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1100918A (en) * | 1965-03-24 | 1968-01-24 | Albert George Bodine | Oscillator means for a vibratory pile driver |
SU631597A1 (ru) * | 1977-04-19 | 1978-11-05 | Protsko Anatolij A | Вибромолот |
JPS5729730A (en) * | 1980-07-31 | 1982-02-17 | Kazuo Murazaki | Vibrohammer |
GB2095731A (en) * | 1981-03-28 | 1982-10-06 | Schmidt Paul | Apparatus for driving and extracting sheet piles and other members |
SU1481325A1 (ru) * | 1986-06-09 | 1989-05-23 | Ленинградское Высшее Военное Инженерное Строительное Краснознаменное Училище Им.Ген.Армии А.Н.Комаровского | Вибромолот |
SU1730359A2 (ru) * | 1990-01-22 | 1992-04-30 | Ленинградское высшее военное инженерное строительное Краснознаменное училище им.генерала армии А.Н.Комаровского | Вибромолот |
US5088565A (en) | 1990-03-23 | 1992-02-18 | J & M Hydraulic Systems, Inc. | Vibratory pile driver |
CN2818553Y (zh) * | 2005-01-31 | 2006-09-20 | 中南大学 | 液压振动沉拔桩机调矩装置 |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Week 197933, Derwent World Patents Index; AN 1979-H0826B, XP002513466 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021075971A1 (en) | 2019-10-18 | 2021-04-22 | Cape Holland Holding B.V. | Vibrating system and method for inserting a foundation element into the ground using flexible elements |
Also Published As
Publication number | Publication date |
---|---|
EP2370642A1 (de) | 2011-10-05 |
US20110240323A1 (en) | 2011-10-06 |
WO2010063764A1 (en) | 2010-06-10 |
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