CN112523267B - Damping self-adaptive fairing device for underwater pile vortex-induced suppression - Google Patents
Damping self-adaptive fairing device for underwater pile vortex-induced suppression Download PDFInfo
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- CN112523267B CN112523267B CN202110150763.4A CN202110150763A CN112523267B CN 112523267 B CN112523267 B CN 112523267B CN 202110150763 A CN202110150763 A CN 202110150763A CN 112523267 B CN112523267 B CN 112523267B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
Abstract
The invention belongs to the technical field of underwater fairings, and particularly relates to a damping self-adaptive fairing device for suppressing vortex excitation of underwater piles. The technical scheme is as follows: the damping self-adaptive fairing device for suppressing the vortex excitation of the underwater pile comprises a plurality of rotating parts sleeved on the pile, wherein a fairing main body is connected outside the rotating parts, and the cross section of the fairing main body is in a water-drop shape; the fairing comprises a fairing body and is characterized by further comprising a plurality of supporting rods connected to the pile and used for supporting the fairing body, and a plurality of damping rods used for jacking the pile are connected to the rotating portion. The invention provides a damping self-adaptive fairing device for restraining vortex excitation of an underwater pile, which can prevent swinging when the flow velocity of water is weak through a damping device.
Description
Technical Field
The invention belongs to the technical field of underwater fairings, and particularly relates to a damping self-adaptive fairing device for suppressing vortex excitation of underwater piles.
Background
With the progress of the times, the attention degree of China to the ocean is deepened, and the ocean is more comprehensively developed. The buildings located at sea today include forest oil wells, offshore wind turbines, sea-crossing bridges, etc., all of which have a common feature of having a number of piles standing in the sea. The pile structure has high construction cost and great engineering difficulty, and if a problem occurs, huge economic loss can be brought, and even serious ecological pollution can be caused to buildings similar to oil fields. When waves and ocean currents flow through the pile column on the seabed, vortexes are formed on two sides of the pile column along the water flow direction alternately when the water flow speed reaches a certain condition, and the vortexes fall off on the back flow side. The falling of the vortex can generate a periodic acting force with variable magnitude on the pile, so that the pile generates transverse vibration in the vertical direction along the water flow direction, the vibration of the structure can react on the flow field, the vortex is enhanced, the resistance of the pile is increased, and the fatigue damage can be generated after the vicious circle is accumulated for a certain time. Therefore, the research on the pile vortex excitation dynamic pressure braking problem of the construction in the ocean is particularly important.
In order to reduce the damage of the vortex-induced vibration to the pile as much as possible, a vortex-induced vibration suppression device is generally adopted for the pile, so that the safety of the pile is improved, the service life of the pile is prolonged, and the cost is reduced. The common vortex-induced vibration suppression technology is divided into an active control technology and a passive control technology, wherein the active control technology is a driving device for inputting external energy, such as an active coordinated damping system, to reduce the vortex-induced amplitude of the pile structure, but the construction is complex and the cost is high, so the method is not easy to popularize. Passive control techniques, which have advantages in this respect, are to suppress or attenuate the vortex-induced amplitude by means of flow-disturbing devices, such as spiral guides, fixed fairings, etc., which have been used in engineering practice.
In the prior art, the invention patent with the patent number of US2007/0104542A1 adopts a fixed fairing with a streamline structure to suppress vortex-induced vibration, and sets a fairing installation angle according to the water flow direction, so that the long diameter direction of the cross section of the fairing is kept parallel to the water flow direction, and a better suppression effect can be achieved. However, the fixed fairing is only suitable for the condition that the water flow direction is fixed and unchanged, when the water flow direction and the long diameter direction form a certain angle, the pressing effect of the fixed fairing is sharply reduced, and even the fluid pressure of the pile is increased because the flow area of the pile is increased, so that greater damage is brought. Thus, facing a marine environment with complex ocean currents, the fixed fairing device has obvious drawbacks.
The invention patents with application publication numbers of CN102071883A and CN102134972A enable the fairing to rotate freely by adding the rotation module, so as to adapt to the change of the water flow direction, and reduce the sensitivity of the vortex-induced vibration pressing effect of the fixed fairing to the water flow direction to a certain extent. However, since the rotation module is not restricted, when the flow velocity of the water flow is small and the flow direction is unstable, the fairing swings irregularly, which increases the resistance of the pile and causes more damage. .
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention aims to provide a damping adaptive fairing device for suppressing the vortex excitation of an underwater pile, which uses a damping device to prevent the oscillation when the flow velocity of water is weak.
The technical scheme adopted by the invention is as follows:
the damping self-adaptive fairing device for suppressing the vortex excitation of the underwater pile comprises a plurality of rotating parts sleeved on the pile, wherein a fairing main body is connected outside the rotating parts, and the cross section of the fairing main body is in a water-drop shape; the fairing comprises a fairing body and is characterized by further comprising a plurality of supporting rods connected to the pile and used for supporting the fairing body, and a plurality of damping rods used for jacking the pile are connected to the rotating portion.
A certain pressure exists between the damping rod and the pile, so that the friction corresponding to the pressure needs to be overcome when the rotating part rotates relative to the pile. Therefore, by adjusting the pressure between the damping rod and the pile, the damping force threshold can be adjusted. When the water flow direction is consistent with the major diameter direction of the fairing main body, the rotation torque of the water flow to the device is zero, and the device is still. When the water flow direction changes, flow speed difference is formed on two sides of the fairing main body, the rotating torque of the water flow to the device is increased, if the included angle between the water flow direction and the major diameter direction of the fairing main body is gradually increased, the rotating torque of the water flow to the device is rapidly increased, when the included angle exceeds a preset damping force threshold value, the device rotates to adjust the direction, and balance is achieved again, so that the resistance on the pile is reduced, and the generation of vortex-induced vibration is weakened.
The design of adding the damping rod between the rotating part and the pile has the advantage that the situation that the whole device swings all the time under the condition that the water flow direction changes but the flow speed changes weakly can be avoided. If the device swings all the time, the vortex-induced vibration borne by the pile cannot be weakened, and the resistance borne by the pile is increased. The damping force is added to the rotating part through the damping rod, so that the stability of the whole device can be ensured, and the effect of reducing vortex-induced vibration can be really achieved.
In a preferred embodiment of the present invention, the damping rod is a damping bolt, and the damping bolt is screwed to the rotating portion. Through precessing different circles with the damping bolt, obtain surpassing the different length of rotation portion, produce different pressure to the stake, consequently can adjust the damping force threshold value that rotation portion received.
As a preferable aspect of the present invention, the cowl body is provided with a connection hole, and a part of the damping rod passes through the connection hole and then is connected to the rotating portion. The fairing main body is connected with the rotating part through the damping rod, so that the use of a connecting piece can be reduced. Moreover, the outer end of the damping rod is exposed out of the connecting hole of the fairing body, so that the damping rod is convenient to operate. The tip end portion of the cowl main body is not in contact with the turning portion, and the damper stick on the turning portion is not connected to the cowl main body.
In a preferred embodiment of the present invention, sealing portions are connected between the top and bottom portions of the cowl body and the rotating portion, respectively. The sealing part can seal the top and the bottom of fairing main part respectively to fairing main part, sealing part and rotation portion enclose into closed cavity, and isolated outside rivers have avoided the disturbance that rivers produced the fairing main part inside getting into the fairing main part, make the device more stable. Also, the internal cavity may create buoyancy when placed in water.
In a preferred embodiment of the present invention, the damping rod is shaped like a hemisphere toward the end of the pile. The tip of damping rod adopts the hemisphere design, then the damping rod provides pressure to the stake with the mode of point to when the near rivers velocity of flow of radome fairing main part surpassed the threshold value, the rotation that the portion can be more nimble rotates.
Preferably, the clearance between the rotating part and the pile is not more than 5 mm. The rotating part is sleeved on the pile, and the diameter of the rotating part is slightly larger than that of the pile, so that the rotating part can rotate relative to the pile. The clearance between rotation portion and the stake is not more than 5mm, makes things convenient for the damping rod contact stake.
As a preferable aspect of the present invention, the rotating portion includes a plurality of arc-shaped members, and adjacent arc-shaped members are connected by a connecting bolt. The rotating part is spliced by a plurality of arc-shaped components, and the diameter of the underwater pile of the offshore building is considered to be larger, so that one circular ring is split into four same arc-shaped components, the purpose of facilitating industrial production is achieved, and meanwhile, the whole device is convenient to install.
As a preferable scheme of the invention, the fairing main body comprises a plurality of arc-shaped plates and two tip plates, and the arc-shaped plates and the tip plates are connected through connecting bolts.
As a preferable scheme of the invention, an included angle between the two tip plates is 40-80 degrees.
In a preferred embodiment of the present invention, the thickness of the rotating part is 1 to 3 cm.
The invention has the beneficial effects that:
under the condition that the water flow direction changes but the flow speed changes weakly, the damping rod can prevent the rotating part from rotating relative to the pile. The design that the damping rod is additionally arranged between the rotating part and the pile prevents the whole device from swinging all the time under the condition that the water flow direction changes but the flow velocity changes weakly, ensures the stability of the whole device and achieves the effect of reducing vortex-induced vibration.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is an exploded view of the rotating portion;
FIG. 4 is a schematic structural view of the present invention;
fig. 5 is a schematic structural view of a damping bolt.
In the figure, 1-pile; 2-a rotating part; 3-supporting rods; 4-a fairing body; 5-a damping bolt; 6-sealing part; 21-an arc-shaped member; 41-arc-shaped plates; 42-tip plate.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, 2 and 4, the damping adaptive fairing device for suppressing vortex-induced vibration of an underwater pile according to the embodiment includes a rotating part 2 sleeved on the pile 1, and further includes a plurality of support rods 3 connected to the pile 1 and used for supporting the rotating part 2, wherein a fairing main body 4 is connected outside the rotating part 2, and the cross section of the fairing main body 4 is in a shape of a water droplet; and the rotating part 2 is connected with a plurality of damping rods for tightly propping up the pile 1.
As shown in fig. 5, the damping rod is a damping bolt 5, and the damping bolt 5 is screwed to the rotating part 2. Different lengths exceeding the rotating part 2 are obtained by screwing the damping bolt 5 for different numbers of turns, different pressures are generated on the pile 1, and therefore the damping force threshold value received by the rotating part 2 can be adjusted. The end of the damping bolt 5 is designed in a hemispherical shape, and the damping bolt 5 provides pressure to the pile 1 in a point mode, so that when the flow rate of water flow near the fairing body 4 exceeds a threshold value, the rotating part 2 can rotate more flexibly.
As shown in fig. 3, the rotating part 2 is composed of four identical stainless steel arc members 21, and the four arc members 21 are connected end to end by connecting bolts to form a closed ring and sleeved on the pile 1. The internal diameter of the rotating part 2 is slightly larger than the external diameter of the pile column 1, the gap between the rotating part and the pile column is not more than 5mm, so that the rotating part 2 can rotate freely, the thickness of the rotating part 2 is controlled to be about 1-3 cm, and the height of the rotating part 2 is 10 cm. The rotating part 2 adopts the design of four arc-shaped components 21, and has the advantages that the diameter of the underwater pile 1 of the offshore building is larger, so that one circular ring is split into four same arc-shaped components 21, the purpose of facilitating industrial production is achieved, and meanwhile, the whole device is convenient to install.
Each arc-shaped member 21 constituting the rotating part 2 has a circular hole formed therein at a position where the internal threaded hole for connecting the damping bolt 5 is formed. The inner wall of the round hole is in a thread structure and is connected by a damping bolt 5. Four round holes symmetric distribution, with during damping bolt 5 precession rotation portion 2's internal thread hole, its length can exceed and withhold stake 1 behind rotation portion 2, support on stake 1. Different lengths exceeding the rotating part 2 are obtained by screwing the damping bolt 5 for different numbers of turns, different pressures are generated on the pile 1, and therefore the damping force threshold value received by the rotating part 2 can be adjusted. When the water flow direction is the same as the major axis direction of the cowling main body 4, the rotation torque of the water flow to the device is zero, and the device is stationary. When the water flow direction changes, flow speed difference is formed on two sides of the fairing main body 4, the rotating torque of the water flow to the device is increased, if the included angle between the water flow direction and the long diameter direction of the fairing main body 4 is gradually increased, the rotating torque of the water flow to the device is rapidly increased, when the included angle exceeds a preset damping force threshold value, the device rotates to adjust the direction and reach balance again, and therefore the resistance of the pile column 1 is reduced, and the generation of vortex-induced vibration is weakened.
The design of adding the damping bolt 5 to the rotating part 2 has the advantage that the situation that the whole device swings all the time under the condition that the water flow direction changes but the flow speed changes weakly can be avoided. If the device swings all the time, not only the vortex-induced vibration received by the pile 1 cannot be weakened, but also the resistance received by the pile 1 increases. The damping bolt 5 is used for increasing a damping force to the rotating part 2, so that the stability of the whole device can be ensured, and the effect of reducing vortex-induced vibration can be really achieved. Four damping bolts 5 are symmetrically distributed on the rotating part 2, so that the pressure of the damping bolts 5 on the pile 1 is uniformly distributed, the stress balance of the provided damping force is ensured, and the balance of the whole device can be ensured.
The fairing body 4 is positioned at the outermost layer of the device, the shape of the cross section of the fairing body is in a drop shape, the fairing body is round at the front and sharp at the rear, and the surface is smooth. The cowl body 4 has a width 2 to 3 times the diameter of the rotor 2 and a height 4 to 6 times the diameter of the rotor 2. The arc-shaped head part in front of the fairing body 4 is in the direction of the incident flow, and the tip plate 42 at the pointed tail part is tangent to the arc-shaped head part. The fairing body 4 is made of a plastic metal sheet, and the thickness of the plastic metal sheet is 5-10 mm. The fairing body 4 has a negligible thickness compared to the diameter of the pile 1, with its circular arc head coaxial with the circular ring of the rotor 2. The fairing body 4 is provided with a connecting hole, and part of the damping rod passes through the connecting hole and then is connected with the rotating part 2. The length of the damping bolt 5 is slightly longer than the sum of the thicknesses of the rotating part 2 and the fairing, and the length exceeds the part by 5 to 8 mm. The fairing body 4 is connected with the rotating part 2 through a damping rod, so that the use of connecting pieces can be reduced. Moreover, the outer end of the damping rod is exposed out of the connecting hole of the fairing body 4, so that the damping rod is convenient to operate. The connecting hole of the fairing body 4 can be provided with internal threads or a smooth inner wall, namely the damping bolt 5 can be in threaded connection with the connecting hole of the fairing body 4, and the connecting hole can also be only in a sleeved relation. The tip end portion of the cowl main body 4 is not in contact with the turning portion 2, and the damper lever on the turning portion 2 is not connected to the cowl main body 4. The cowl body 4 is composed of five parts, in which the pointed tail portion is divided into two symmetrical tip plates 42 along the long diameter, and the other three parts are curved plates 41. Wherein the included angle of the circular arcs in the incident flow direction is 120 degrees, and the included angle of the two tip plates 42 symmetrically distributed along the major axis is 60 degrees. The top and the bottom of the fairing body 4 are both provided with rotating parts 2, so that the rotating balance is ensured. The inside of the fairing body 4 is connected through a connecting bolt, and the outside is not provided with a screw hole to ensure the smoothness of the appearance.
The fairing body 4 is made of a plastic metal sheet, so that the weight of the whole device can be reduced, and the diameter and the length of the pile 1 can be increased. If the diameter of the original pile 1 is increased too much due to the additional installation of the vortex-induced suppression device, the resistance of the pile 1 is increased, and the suppression of vortex-induced vibration is not facilitated.
The number of the support rods 3 is four, and the four support rods 3 are uniformly distributed on the surface of the pile column 1, so that the fairing body 4 is supported. The support rod 3 is columnar and is in threaded connection with the pile column 1, and is made of stainless steel, 8-10 cm in length and 6cm in diameter.
Considering that the height of the underwater pile 1 of the offshore or river building is larger, the whole device can be installed in a multi-section mode, and the interval between every two adjacent devices is the diameter of the pile 1.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (9)
1. The damping self-adaptive fairing device for suppressing vortex excitation of the underwater pile is characterized by comprising a plurality of rotating parts (2) sleeved on the pile (1), wherein a fairing main body (4) is connected outside the rotating parts (2), and the cross section of the fairing main body (4) is in a water drop shape; the fairing comprises a fairing body (4) and is characterized by further comprising a plurality of supporting rods (3) which are connected to the pile (1) and used for supporting the fairing body (4), wherein a plurality of damping rods used for tightly jacking the pile (1) are connected to the rotating part (2);
the damping rod is a damping bolt (5), and the damping bolt (5) is in threaded connection with the rotating part (2).
2. The self-adaptive damping fairing device for underwater pile vortex-induced damping as recited in claim 1, wherein said fairing body (4) is provided with a connection hole, and a part of the damping rod passes through the connection hole and then is connected with the rotating part (2).
3. Damping adaptive fairing device for underwater pile vortex induced damping according to claim 1, characterized in that sealing parts (6) are connected between the top and bottom of the fairing body (4) and the rotating part (2), respectively.
4. Damping adaptive fairing device for vortex-induced damping of underwater piles according to claim 1, characterized in that the shape of the damping rods towards the end of the pile (1) is hemispherical.
5. Damping adaptive fairing device for vortex-induced damping of underwater piles according to claim 1, characterized in that the clearance between the rotating part (2) and the pile (1) is not more than 5 mm.
6. Damping adaptive fairing device for underwater pile vortex induced damping according to claim 1, characterized in that said rotating part (2) comprises several arc shaped elements (21), adjacent arc shaped elements (21) being connected by means of connecting bolts.
7. The self-adaptive damping fairing device for suppressing vortex-induced vibration of underwater piles as claimed in claim 1, wherein the fairing body (4) comprises a plurality of arc-shaped plates (41) and two tip plates (42), and the plurality of arc-shaped plates (41) and the tip plates (42) are connected through connecting bolts.
8. The damped adaptive fairing device for vortex-induced damping of underwater piles according to claim 7, characterized in that the angle between said two tip plates (42) is 40-80 °.
9. The damping adaptive fairing device for underwater pile vortex-induced damping according to any one of claims 1 to 8, characterized in that the thickness of the rotating part (2) is 1 to 3 cm.
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| CN202110150763.4A CN112523267B (en) | 2021-02-04 | 2021-02-04 | Damping self-adaptive fairing device for underwater pile vortex-induced suppression |
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| CN202110150763.4A CN112523267B (en) | 2021-02-04 | 2021-02-04 | Damping self-adaptive fairing device for underwater pile vortex-induced suppression |
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| CN112523267B true CN112523267B (en) | 2021-05-04 |
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| CN114296016A (en) * | 2021-12-30 | 2022-04-08 | 北京科技大学 | Device and method for measuring magnetism by applying uniaxial strain in situ |
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| GB2455951A (en) * | 2006-11-22 | 2009-07-01 | Shell Int Research | Systems and methods for reducing drag and/or vortex induced vibration |
| US8523492B2 (en) * | 2007-01-05 | 2013-09-03 | Benton Frederick Baugh | Method of installing fairings around vertical pipes |
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