EP4045721A1 - Vibrating system and method for inserting a foundation element into the ground using flexible elements - Google Patents
Vibrating system and method for inserting a foundation element into the ground using flexible elementsInfo
- Publication number
- EP4045721A1 EP4045721A1 EP20797885.9A EP20797885A EP4045721A1 EP 4045721 A1 EP4045721 A1 EP 4045721A1 EP 20797885 A EP20797885 A EP 20797885A EP 4045721 A1 EP4045721 A1 EP 4045721A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vibrating
- foundation element
- vibrating device
- flexible
- ground
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 238000013016 damping Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 238000003780 insertion Methods 0.000 description 8
- 230000037431 insertion Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/08—Sinking workpieces into water or soil inasmuch as not provided for elsewhere
Definitions
- the invention relates to a vibrating system for inserting a foundation element, such as a foundation pile for a wind turbine, into the ground.
- a foundation element such as a foundation pile for a wind turbine
- Such foundation elements can be inserted into the ground on land or at sea.
- Vibrating systems as such are known in practice. These systems make use of a vibrating device and more particularly of a vibrator block provided with a number of eccentrics. Such a vibrator block exerts vibrations on the foundation element, whereby this element is vibrated into the ground. These vibrator blocks are usually arranged as rigid as possible on the upper side of the foundation element during insertion thereof.
- the vibrating systems known in practice are usually driven hydraulically, wherein use is made of a so-called power pack comprising a diesel engine and a hydraulic pump. This hydraulic pump drives the hydraulic motor of the vibrating device.
- the vibrator devices create vibrations with a frequency that may bring the foundation element into resonance. Resonating frequency changes with the penetration depth of the pile due to the increasing influence of the soil on the foundation element surface. This makes it difficult to prevent undesired resonance of the foundation element.
- variable conditions can be a local variation in ground condition and/or a ground layer with a greater resistance to insertion of the foundation element.
- the greater resistance entails the danger of overloading of the hydraulic system and reaching the pressure limits, so that a safety valve will open and some of the hydraulic oil is discharged, preferably back to the hydraulic oil reservoir. This increases the insertion time of the foundation element and in addition increases the amount of energy required for this purpose.
- An object of the present invention is to obviate or reduce the above stated problems and to provide an effective vibrating system for inserting a foundation element into the ground.
- the vibrating system for inserting a foundation element into the ground according to the present invention, wherein the vibrating system comprises: a vibrating device; a drive operatively connected to the vibrating device and configured for driving the vibrating device; coupling configured for connecting the vibrating device with the foundation element, wherein the coupling comprises a flexible element.
- a flexible element is provided between the vibrating device and the foundation element, in particular the upper side thereof.
- This provides a flexible coupling or connection between the vibrating device and the foundation element, such as a foundation pile, a foundation tube and a sheet pile profile.
- the flexible connection is made in such a way that the vibration of the vibrating device is amplified or resonates due to the flexible connection and hence the vibratory effect on the foundation element is increased above that which is possible by making a conventional fixed/rigid connection.
- An advantage is that the vibrating system of the invention may insert a foundation element with the use of less energy consumption as compared to conventional systems.
- a further advantage of the system according to the invention is that the spring stiffness of the flexible connection is not (significantly) affected by the soil and potential high stresses will be concentrated in the flexible connection.
- the disadvantages of resonating the foundation element are obviated. This reduces the insertion time required for inserting the foundation element into the ground and/or reduces the energy required for the insertion in a wide operating range of occurring conditions, such as insertion resistance.
- An effective vibrating system is hereby provided.
- the flexible element has spring and damping characteristics.
- Providing the flexible elements introduces spring and damping characteristics between the vibrating device and the foundation element. This enables the increase of the vibratory effect on the foundation element. This reduces the amount of energy consumption that is required to insert a foundation element into the ground. Also, it may reduce the noise emission of the insertion process. Furthermore, it may shorten the time period that is required for inserting the foundation element into the ground.
- the number of elements can be determined in view of the vibrating device and the foundation element, for example.
- the flexible element comprises rubber elements. These rubber elements are effective and efficient to provide the desired spring and damping characteristics between the vibrating device and the foundation element.
- the flexible element comprises steel elements (such as steel springs) and/or composite elements.
- the flexible element comprises a gas element. Such gas element may behave like a gas cylinder and is positioned between the vibrating device and the foundation element.
- the flexible element comprises a (electro)- magnetic spring system.
- a combination of two or more of these flexible elements is applied in an embodiment of the invention.
- the vibrating device comprises a number of eccentrics.
- the vibration source is the vibrating device with in this embodiment the eccentrics.
- Vertical oscillation of a vibration device is often generated by means of the pairwise installed eccentric weights that rotate in a vertical plane to create vibration.
- the vibrating device comprises a vibrator block that acts as the vibrating element.
- the vibrator block may comprise one or more linear vibrating weights.
- the weights can be used in combination with the flexible elements that may comprise rubber elements, gas elements etc.
- the drive of the vibrating device formed by the motor, comprises a hydraulic motor, a (hydraulic) pump, and the drive unit that produces a quantity of hydraulic fluid which determines the frequency of the vibrating device.
- the effective frequency of the vibrating device is determined in practice by the relation between the quantity of hydraulic fluid and the so-called stroke volume of the hydraulic motor, together with the transmission ratio inside the vibrating device.
- the frequency of the vibrating device together with the eccentric moment of the vibrating device determines the impact force, i.e. the power produced by the vibrating device.
- other drives can be used as an alternative or in addition, including electric and pneumatic drives.
- the vibrating system comprises a control system configured to modify the drive force of the vibrating system.
- Providing a control system enables the adjusting device to be controlled in effective manner.
- the control system is preferably provided with a pressure sensor whereby it is possible to determine the current operating pressure and, also on the basis thereof, perform the adjustment of the stroke volume of the hydraulic motor in particular. An effective and efficient modification of the settings of the vibrating system according to the invention can be realized in this way.
- the invention further relates to a method for varying the drive force of a vibrating system for inserting a foundation element into the ground, wherein the method comprises the steps of: providing a vibrating system according to an embodiment of the invention; and enhancing the vibrating effect of the vibrator element with the flexible elements between the vibrating device and the foundation element.
- the method provides the same advantages and effects as described for the vibrating system.
- the application of the flexible element enhances the vibrational movements, thereby providing an optimal power take-up by the foundation element, which preferably remains substantially constant under variable conditions.
- a foundation element can hereby be placed in the ground in effective manner with a short insertion time and/or minimal energy consumption.
- Figure 1 shows a view of a vibrating system according to the invention
- Figure 2 A-D shows a view of an alternative vibrating system according to the invention, Figure 2 C being a cross-sectional view along A- A in Figure 2 B, and Figure 2 D being a cross-sectional view along B-B in Figure 2 B; and Figure 3 A-C show schematic overviews of alternative vibrating devices for the vibrating system according to the invention.
- Vibrating system 2 ( Figure 1) comprises an outer suppressor 4 that is coupled to inner suppressor 8 via spring elements 6 that prevent vibrations to reach the boom of the lifting device, for example.
- Inner suppressor 8 is mounted on carter 10 of frame 14.
- Clamps 16 of clamping mechanism 18 clamp foundation pile 12.
- connections between inner suppressor 8, carter 10, frame 14, clamps 16 of clamping mechanism 18 and foundation pile 12 are rigid.
- elements 24 are made of a rubber material.
- vibrating system 2 comprises vibrating device 20 with eccentrics 22 that is mounted on plate 26. Between plate 26 and connector 28 there are provided a number of flexible elements 24. Connector 24 can be connected to a foundation element via flange 30. It will be understood that also a clamp coupling could be envisaged, for example like claiming mechanism 18. Vibrating system 2 is further provided with controller 32.
- Vibrating device 20 ( Figure 3 A) comprises a number of eccentrics 34. Between vibrating device 20 and pile 12 there are provided a number of flexible elements 24 providing spring characteristics 24a and damping characteristics 24b to vibrating system 2.
- vibrating device 20 ( Figure 3B) comprises a number of linear vibrating weights 36. Between vibrating device 20 and pile 12 there are provided a number of flexible elements 24 providing spring characteristics 24a and damping characteristics 24b to vibrating system 2.
- vibrating device 20 comprises a number of linear weights 36 directly connected to a number of flexible elements 24.
- eccentrics 34 and/or weights 36 can be drive hydraulically, and also electrically or pneumatically, or by combinations thereof.
- weights move in a cylinder type chamber 38 using a gas force.
- vibrating system 2 is connected to foundation element 12.
- vibrating device 20 starts to vibrate. Vibrations are lead to pile 12 that is therewith inserted into the ground.
- the flexible connection with flexible elements 24 between vibrating device 20 and pile 12 is made in such a way that the vibration of the vibrating device is amplified or resonates due to the flexible connection and hence the vibratory effect on the foundation element is increased above that which is possible by making a conventional fixed/rigid connection. Tests have shown that the vibrating system of the invention may insert a foundation element with the use of less energy consumption as compared to conventional systems.
Landscapes
- 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)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL2024046 | 2019-10-18 | ||
PCT/NL2020/050643 WO2021075971A1 (en) | 2019-10-18 | 2020-10-19 | Vibrating system and method for inserting a foundation element into the ground using flexible elements |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4045721A1 true EP4045721A1 (en) | 2022-08-24 |
Family
ID=73030186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20797885.9A Pending EP4045721A1 (en) | 2019-10-18 | 2020-10-19 | Vibrating system and method for inserting a foundation element into the ground using flexible elements |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP4045721A1 (en) |
WO (1) | WO2021075971A1 (en) |
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 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1066727A (en) * | 1964-11-21 | 1967-04-26 | Zaklady Sprzetu Budowlanego Nr | Control equipment for two-shaft vibratory hammer |
CH594111A5 (en) | 1975-07-14 | 1977-12-30 | Rohrer Marti Ulrich Ag | |
US5653556A (en) * | 1995-10-10 | 1997-08-05 | American Piledriving Equipment, Inc. | Clamping apparatus and methods for driving caissons into the earth |
EP2194191A1 (en) | 2008-12-04 | 2010-06-09 | Fistuca B.V. | A vibratory mechanism for a pile driver and a pile driver |
NL2013871B1 (en) * | 2014-06-10 | 2016-05-03 | Cape Holland Holding B V | Vibrating device and method for placing a foundation element in a substrate. |
DE102014016400B4 (en) * | 2014-11-07 | 2019-01-17 | Thyssenkrupp Ag | Vibratory ram arrangement with integrated drive unit |
CN107905229B (en) * | 2017-11-16 | 2019-09-24 | 浙江科技学院 | Reducing ground resonance influences the vibrohammer and pile sinking process of ambient enviroment |
EP4045721A1 (en) | 2019-10-18 | 2022-08-24 | Cape Holland Holding B.V. | Vibrating system and method for inserting a foundation element into the ground using flexible elements |
-
2020
- 2020-10-19 EP EP20797885.9A patent/EP4045721A1/en active Pending
- 2020-10-19 WO PCT/NL2020/050643 patent/WO2021075971A1/en unknown
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 |
---|---|
WO2021075971A1 (en) | 2021-04-22 |
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