WO2004009949A1 - 水中パイプの防振装置 - Google Patents
水中パイプの防振装置 Download PDFInfo
- Publication number
- WO2004009949A1 WO2004009949A1 PCT/JP2002/007423 JP0207423W WO2004009949A1 WO 2004009949 A1 WO2004009949 A1 WO 2004009949A1 JP 0207423 W JP0207423 W JP 0207423W WO 2004009949 A1 WO2004009949 A1 WO 2004009949A1
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- WO
- WIPO (PCT)
- Prior art keywords
- main body
- vibration isolator
- pipe
- water flow
- regulating
- Prior art date
Links
- 230000001105 regulatory effect Effects 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000000926 separation method Methods 0.000 claims description 17
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000002265 prevention Effects 0.000 claims 1
- 230000000644 propagated effect Effects 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 32
- 230000000694 effects Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 235000019227 E-number Nutrition 0.000 description 2
- 239000004243 E-number Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/10—Influencing flow of fluids around bodies of solid material
- F15D1/12—Influencing flow of fluids around bodies of solid material by influencing the boundary layer
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
- E21B17/012—Risers with buoyancy elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
- B63B21/502—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs
- B63B2021/504—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs comprising suppressors for vortex induced vibrations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/123—Devices for the protection of pipes under water
Definitions
- the present invention relates to a vibration isolator for an underwater pipe.
- Offshore engineering works such as offshore oil field mining work include the installation of underwater pipes perpendicular to the workboat or workbench.
- a Karman vortex is generated downstream of the underwater pipe, and the submerged pipe vibrates due to the influence of the Karman vortex. Vibration can cause structural fatigue and breakage of the underwater pipe.
- a facing member extending in the downstream direction of the flow is attached so as to cover the underwater pipe.
- the fairing member is attached to the submersible pipe through the bearing.
- the bearings are placed in the sea, algae and garbage get tangled with the bearings. Therefore, there is a problem that the fairing member is prevented from rotating around the underwater pipe following the change in the direction of the water flow.
- Japanese Patent Publication No. 5 8-3 7 4 5 0 discloses an offshore work platform 95 equipped with a vibration isolator. As shown in Fig. 14 A, the marine work platform 95 is supported by a plurality of pillars, and an underwater pipe 98 is attached. An anti-vibration device suspended from the marine work platform 9 5, that is, a fairing member 9 7 covers the underwater pipe 9 8. As shown in Fig. 14 B, when the direction of the water flow of the fairing member 9 7 changes, the fairing member 9 7 rotates so that the trailing edge of the fairing member 9 7 faces downstream of the underwater pipe 9 8. .
- the bearing is attached to a marine work bench placed on the water, and a fairing member is attached to the bearing.
- the length of the fairing member must be several times the diameter of the underwater pipe. It is known in the field of hydrodynamics.
- a bearing having a complicated structure is required to support a relatively large and heavy fairing member without hindering the rotation.
- such a large fairing member causes a problem of complicated transportation and assembly work.
- the present invention has been made in view of the above problems, and an object thereof is to provide an apparatus for suppressing vibration of an underwater pipe with a compact and simple structure.
- the present invention provides a vibration isolator for preventing vibration of a pipe that receives a water flow.
- the anti-vibration device includes a main body that covers at least a part of the pipe in the water flow and is rotatably disposed along the outer surface of the pipe, and a plurality of vibration isolation devices that are provided on the surface of the main body to restrict separation of the water flow.
- a buoyancy that allows the main body and a plurality of restrictive members to be arranged at predetermined positions on the pipe, and can follow the change in the direction of water flow and can rotate together with the main body in the circumferential direction of the pipe.
- buoyancy generating means Each of the plurality of regulating members is disposed in a separation region formed between the surface and the steady flow region, and protrudes from the surface toward the steady flow region of the water flow.
- a feature is that the tip of each regulating member does not reach the steady flow region.
- the plurality of restricting members are preferably disposed substantially symmetrically with respect to a central plane including the central axis of the main body.
- the body has an opening extending along the longitudinal axis of the pipe, and two of the plurality of restricting members are provided adjacent to the edge of the opening.
- the surface of the main body is curved, and the cross section perpendicular to the central axis of the main body is C-shaped.
- the buoyancy generating means is further provided with positioning means fixed to a predetermined position of the pipe in order to dispose the buoyancy generating means in water and to restrict the buoyancy generating means from rising.
- the positioning means preferably includes a stopper plate attached to the pipe above the buoyancy generating means.
- the apparatus further comprises a weight attached to the main body and offsetting the buoyancy of the buoyancy generating means to prevent the main body from rising.
- the positioning means preferably includes a stopper plate attached to the underwater pipe below the main body in order to restrict the lowering of the main body. That's right.
- the main body is one of a plurality of main bodies divided in the longitudinal direction of the pipe, and the plurality of main bodies allow each of the plurality of main bodies to rotate independently.
- the main body is formed by assembling a plurality of arc parts.
- the restricting member is preferably attached to the main body by a hinge that allows it to fall along the surface of the main body.
- the plurality of regulating members are preferably attached to the main body at a position separated from the intersection between the water flow and the main body by a predetermined angle in the circumferential direction of the main body. Further, it is preferable that the protruding amount of each of the plurality of regulating members from the main body is 10% to 20% of the outer diameter of the pipe.
- FIG. 1A is a schematic view of a marine workbench provided with a vibration isolator according to the first embodiment of the present invention.
- Figure 1B is a partially enlarged view of the vibration isolator.
- FIG. 1C is a cross-sectional view of the vibration isolator of FIG. 1B.
- Fig. 2A and Fig. 2B are schematic views of a vibration isolator that rotates following the change in the direction of water flow.
- 3A and 3B are schematic views of a vibration isolator of a comparative example.
- Fig. 4 is a schematic diagram of a wind tunnel experimental device for testing a vibration isolator.
- Figure 5 is a graph showing the correlation between Reynolds number and balance output (resistance).
- Figure 6 is a graph comparing resistance at a given Reynolds number.
- FIG. 7 is a graph showing the vibration of the vibration isolator of Comparative Example 1.
- FIG. 8 is a graph showing the vibration of the vibration isolator of Example 1.
- FIG. 9 is a graph showing the vibration of the vibration isolator of Comparative Example 3.
- FIG. 10 is a graph showing vibration of the vibration isolator of Comparative Example 4.
- FIG. 11A is a partial perspective view of the vibration isolator according to the second embodiment of the present invention.
- FIG. 11B is a perspective view of the vibration isolator according to the third embodiment of the present invention.
- Fig. 1 2 A to 1 2 E, Fig. 1 3 A is a schematic diagram of another example of the vibration isolator of the present invention.
- FIGS. 13B and 13 are schematic views showing the operation of the vibration isolator of FIG. 13A.
- FIGS. 13D to 13G are other examples of the vibration isolator of the present invention.
- Fig. 14 A is a schematic diagram of a marine workbench equipped with a conventional vibration isolator.
- FIG. 14B is a perspective view of the vibration isolator of FIG. 14A.
- the maritime work platform 1 1 is supported on the sea surface by the support 1 2.
- Underwater pipes 1 3 are extended from the offshore work platform 1 1 toward the seabed.
- the underwater pipe 13 is a cylindrical body such as a cylinder or a cylinder, and a vibration isolator 21 is provided so as to cover at least a part of the underwater pipe 1 3.
- the vibration isolator 2 1 is composed of a main body 2 2 that covers the underwater pipe 1 3, and a regulating member 2 3, 2 4, And buoyancy generating members, that is, floats 25. Note that only the outline of the underwater pipe 13 is shown.
- the body 2 2 is a cylinder having a curved outer surface 2 2 a.
- the outer diameter of the main body 22 is preferably slightly larger than the outer diameter of the underwater pipe 13.
- the ratio of the outer diameter of the main body 2 2 and the outer diameter of the underwater pipe 1 3 is 2 7: 25.
- Float 25 is a hollow metal ring.
- the inside of the metal float 25 is evacuated.
- the inner diameter of the float 25 is larger than the outer diameter of the underwater pipe 13.
- the underwater pipe 1 3 passes through the float 2 5 and the body 2 2.
- the main body 2 2 is suspended from the float 25 by a plurality (two in this case) of wires 26.
- the buoyancy of the float 25 is set so that the float 25 is placed on the sea surface while the body 22 is suspended, and the body 22 is placed at a predetermined depth from the sea surface.
- the main body 2 2 and the float 2 5 are arranged coaxially with the underwater pipe 1 3.
- the anti-vibration device 2 1 is not connected to the offshore work platform 1 1, and water is interposed between the anti-vibration device 2 1 and the underwater pipe 1 3. It can be rotated around.
- the two pairs of restricting members 2 3 and 2 4 are plates extending along the longitudinal axis of the main body 22.
- the two pairs of restricting members 2 3 and 2 4 project radially from the outer surface 2 2 a of the main body 2 2.
- the protruding amount (width) of the restricting member 24 is larger than the protruding amount (width) of the restricting member 23.
- the width of the regulating member 2 3 is 10% of the outer diameter of the underwater pipe 1 3
- the width of the regulating member 2 4 is 2 of the outer diameter of the underwater pipe 1 3. 0%.
- each pair of the regulating member 23 and the regulating member 24 is symmetric with respect to the central plane A including the axis of the main body 22.
- each regulating member 23 is attached at a position separated from the intersection F of the center plane A and the outer surface 2 2 a of the main body 22 by an angle ⁇ in the circumferential direction of the main body 22.
- the member 24 is attached at a position separated by an angle / 3 in the circumferential direction of the main body 22.
- the attachment angle is 1 20 ° and the attachment angle 3 is 1400 °.
- the mounting angles ⁇ ,] 3 of the restricting members 23, 24 are only required to be larger than 90 °, and preferably in the range of 120 ° to 150 °. Attach two regulating members 2 3 having a width of 10% of the diameter of the underwater pipe 1 3 so that the mounting angle ⁇ is 1 2 0 °. It is more desirable to attach the two regulating members 24 having the angle i3 to be 140 °. When the mounting angles ⁇ ,] 3 are around 120 ° and 140 °, respectively, the vibration of the submerged pipe 13 is most effectively reduced.
- the vibration isolator 21 rotates to a position where the resistance of the water flow 29 becomes minimum. That is, when the regulating members 23 and 24 receive the force of the water flow 29, the main body 22 is rotated, and the float 25 is rotated as the main body 22 rotates. The rotation of the main body 2 2 is stopped at a position where the restricting members 2 3 and 24 are downstream of the water flow 29 and symmetrical with respect to the direction of the water flow 29. At this time, the angle formed between the direction of the water flow 29 and the regulating member 23 is 120 °, and the angle formed between the direction of the water flow 29 and the regulating member 24 is 140 °. Since the float 25 is connected to the main body 22 through the wire 26, it is rotated by the same amount as the main body 22 as the main body 22 rotates.
- the water flow 29 After flowing along the curved outer surface 2 2 a of the main body 2 2, the water flow 29 is separated from the outer surface 2 2 a at a position upstream of the regulating member 2 3.
- the separation of the water flow 29 generates a separation flow 30 indicated by a one-dot chain line, and a steady flow region 31 is formed in a region relatively separated from the outer surface 22a of the main body 22.
- the regulating members 2 3 and 24 are present in the separation region 3 2 between the outer surface 2 2 a of the main body 2 2 and the steady flow region 3 1. Paraphrasing
- the regulating members 2 3 and 2 4 exist in the separation region 3 2, and the tips of the regulating members 2 3 and 2 4 do not reach the steady flow region 3 1.
- a turbulent vortex 33 is generated in the separation region 32, and the turbulent vortex 33 causes a disturbance.
- the restricting members 2 3 and 24 suppress the turbulence excited by the turbulent vortex 3 3 from propagating upstream, and restrict the flow separation from increasing. As a result, the vibration of the underwater pipes 13 caused by the separation of the water flow 29 is suppressed.
- the anti-vibration device 2 1 also reduces the resistance that the underwater pipe 1 3 receives from the water flow 29.
- the regulating members 2 3 and 2 4 receive the force of the water flow 35.
- the vibration isolator 21 rotates.
- the angle between the direction of the water flow 35 and the regulating member 23 is 1 20 °
- the angle between the direction of the water flow 35 and the regulating member 24 is 140 °.
- the restricting members 2 3 and 2 4 are disposed in the separation region 36 corresponding to the changed water flow 35.
- the restricting members 2 3 and 2 4 suppress the propagation of the disturbance excited by the turbulent vortex 3 7 generated in the separation region 3 6 to the upstream, and the vibration of the underwater pipe 13 is suppressed.
- the regulating members 2 3 and 2 4 are always arranged in the flow separation regions 3 2 and 3 6. It is. As a result, the vibration of the underwater pipe 1 3 and the resistance that the underwater pipe 1 3 receives from the water flows 29 and 3 5 are reduced.
- the anti-vibration effect and the resistance reduction effect were measured as follows.
- Fig. 4 shows a wind tunnel experimental device for measuring vibration and resistance of pipes 13.
- the wind tunnel test equipment consists of a vertically arranged pipe 1 3, a support bar 5 3 that rotatably supports the pipe 1 3, a load cell 5 4 attached to the lower end of the support bar 5 3, and a load cell 5 4
- a personal computer 5 6 connected to a load cell 5 4 through an amplifier 5 5, and a wind tunnel 5 7 for blowing wind to the pipe 13.
- Load cell 54 has a built-in strain gauge.
- the load cell 54 supplies a detection signal corresponding to the magnitude of the load received by the pipe 13 to the personal computer 56 via the amplifier 55.
- the data 56 Based on the voltage (balance output (V)) of the detection signal, the data 56 calculates the magnitude of the load received by the pipe 13 and the vibration of the pipe 13.
- V voltage
- the pipe 13 is arranged downstream of the outlet of the wind tunnel 57 by about 10 Omm.
- the diameter of the outlet of the wind tunnel 57 is 350 mm, the outer diameter of the pipe 13 is 25 mm, and the total length is about 420 mm.
- the pipe 13 was inserted into the model main body 58 suspended by the wire 26.
- the outer diameter of the model main body 58 is 27 mm, and the model main body 58 has a length covering almost the entire length of the pipe 13.
- Five reinforcing rings 59 were attached to five locations including the upper and lower ends of the model body 58.
- the five reinforcing rings 59 are separated from each other by 10 Omm.
- Each reinforcing ring 59 has an inner diameter of 27 mm, an outer diameter of 30 mm, and a thickness of 2.5 mm.
- the regulating members 23 and 24 were attached to the model body 58 at a predetermined position of 120 ° and] 3 of 140 °.
- the ratio between the widths of the regulating members 23 and 24 and the outer diameter of the pipe 13 is as described above.
- the Reynolds number (R e number) around pipe 13 changes according to the wind speed in wind tunnel 57.
- the Reynolds number (R e number) around pipe 1 3 was adjusted.
- the wind speed of wind tunnel 57 was adjusted to be the same as the Reynolds number of the water flow around pipe 13 for the offshore oil field. Specifically, the wind speed of wind tunnel 57 was adjusted to 7.5 to 1 1. SmZs so that the Reynolds number was 1 2500 to 1800. Based on the results of this wind tunnel experiment, we can consider underwater phenomena.
- FIG. 3B a similar experiment was conducted on a pipe 13 to which a triangular flooring member 6 1 formed of two plates was attached.
- the distance between the triangular top of the fairing member 61 and the outer surface of the pipe 13 is 1 Omm.
- the pipe 13 is rotated at a position where the top of the fairing member 61 is diagonally oriented with respect to the direction of the wind flow (Fig. 3 B chain line). Stopped.
- measurement was performed with one plate of the fairing member 61 extending in the direction of the wind flow, and the fairing member 61 being disposed asymmetrically with respect to the direction of the wind flow.
- Example 1 and Comparative Examples 1 to 4 are shown in Table 1 and FIGS.
- Figure 5 shows the resistance experienced by pipe 13.
- Table 1 shows the resistance received by pipe 13 as a percentage of that of Comparative Example 1.
- FIG. 6 shows the resistance received by the pipe 13 when the Reynolds number is 1880 as a percentage of that of Comparative Example 1.
- Figures 7 to 10 show the vibration of pipe 13.
- Example 1 had higher resistance than Comparative Example 2, but about 25% compared to Comparative Example 1. Resistance was reduced.
- Comparative Example 3 the resistance was reduced more than Comparative Example 4, and in Comparative Example 2, the resistance was reduced more than Comparative Example 4.
- the regulating members 2 3 and 2 4 have a greater effect of reducing the resistance than the fairing member 6 1. Therefore, when the model body 5 8 (Example 1) to which the regulating members 2 3 and 2 4 are attached has a resistance lower than that of the model body 5 8 (not shown) to which the fairing member 61 is attached. Conceivable.
- Comparative Example 3 The resistance of Comparative Example 3 was between Comparative Example 2 and Comparative Example 4. That is, it can be seen that the fairing member 61 further reduces the resistance when disposed asymmetrically with respect to the flow direction.
- Example 1 and Comparative Example 2 when the wind was blown from the direction asymmetric with respect to the regulating members 2 3 and 2 4, the model body 5 8 or the pipe 1 3 had the regulating members 2 3 and 2 4 It turned to the position which became symmetrical with respect to the direction of flow.
- FIGS. 7 to 10 are graphs showing vibrations of Comparative Example 1, Example 1, Comparative Example 3, and Comparative Example 4, respectively, when the Re number is 1880.
- the vertical axis of FIGS. 7 to 10 is the output voltage of the load cell 54 corresponding to the force received by the pipe 13 from the lateral direction, that is, the force received from the direction of 90 ° with respect to the flow direction. .
- Example 1 of FIG. 8 the periodic vibration is reduced. Therefore, it is considered that the generation of periodic Karman vortices is suppressed. In addition, since the noise is reduced, it is considered that the flow disturbance has also been reduced.
- the vibration isolator 21 includes a main body 2 2 provided with restricting members 2 3 and 24, and a float 25 that places the main body 2 2 at a predetermined height of the submerged pipe 13. Vibration isolator 2 Since 1 has a float 25, the wires 96 (FIGS. 14A and 14B) for connecting the main body 2 2 to the offshore work platform 1 1 and the underwater pipe 1 3 are not necessary. The float 25 does not hinder the main body 2 2 from rotating following the change in the direction of the water flow when the regulating members 2 3 and 2 4 receive a force from the flow. That is, the vibration isolator 21 is free to float around the underwater pipe 1 3.
- the vibration isolator 21 is more compact than the conventional fairing member 9 7 as shown in Fig. 14 B. It is.
- the first embodiment may be modified as follows.
- the inside of the float 25 does not have to be a vacuum.
- a gas such as air may be floated and enclosed in the interior of 25.
- the float 25 may be formed of a material other than metal, such as plastic. You can also use a float 25 made of a ring made of a material with a specific gravity smaller than water, such as polystyrene foam, reinforced with a reinforcing material such as metal.
- the ratio of the outer diameter of the main body 2 2 and the outer diameter of the underwater pipe 1 3 is not limited to 2 7: 25.
- the regulating members 2 3, 24 may be any width or mounting position that is located in the flow separation region with respect to the main body 22. Therefore, restricting the width of the member 2 3 is not limited to 1 0% of the outer diameter of the water pipe 1 3, the regulating member 2 4 Width Les such limited 2 0% of the outer diameter of the water pipe 1 3, [pi One of each pair of the regulating member 23 and the regulating member 24 may be omitted. For example, only two regulating members 24 may be attached to the main body 22.
- each regulating member 24 is 140 °, and the width of each regulating member 24 is 20% of the diameter of the underwater pipe 13.
- the wire 2 6 connecting the main body 2 2 and the float 2 5 may be omitted, and the main body 2 2 may be directly attached to the float 2 5.
- the float 25 may be placed underwater.
- an underwater pipe 13 for submarine drilling work connected from a work ship 71 via a flexible underwater pipe 72 is submerged in the sea.
- a stopper plate 73 as a positioning means for restricting the floating 25 is attached to the underwater pipe 13. Since the rising of the floating 25 is restricted, the floating of the restricting members 2 3 and 2 4 is also prevented, and the restricting members 2 3 and 2 4 are placed at a predetermined position (water depth) where vibration of the underwater pipe 1 3 should be suppressed. Be placed.
- a stopper plate 7 for restricting the lowering of the main body 2 2 7 You can attach 3 to the underwater pipe 1 3.
- the weight of the weight 7 4 is adjusted so that the excess weight of the float 2 5 is offset by the weight 7 4, and the weight of the vibration isolator 2 1 is slightly higher than that of the float 2 5 Is done.
- the stop plate 7 3 places the main body 2 2, in particular the regulating members 2 3 and 2 4, at predetermined positions of the underwater pipe 1 3.
- the main body 2 2 does not need to cover the entire length of the underwater pipe 1 3, but may be long enough to cover at least a part of the underwater pipe 1 3.
- the main body 2 2 does not have to cover the entire circumference of the underwater pipe 1 3.
- it has a C-shape having an opening 7 6 at a location sandwiched between the restricting members 24.
- the maintenance of the main body 75 and the underwater pipes 13 is further facilitated by the openings 7 6.
- two semicircular arc parts 7 8 may be joined with hinges 7 9 and bolts 80 to form body 2 2.
- the main body 75 may be formed by joining two circular arc parts 8 1 with bolts 80 or the like. In these cases, the main body 2 2 can be easily attached. For example, the main body 2 2 can be attached underwater.
- the restriction members 2 3 and 2 4 are moved to the main body 2 2 by the hinge 8 2 so that the restriction members 2 3 and 2 4 can be tilted along the outer surface 2 2 a of the main body 2 2 during transportation. You can install it.
- the restricting members 2 3 and 24 be curved along the outer surface 2 2 a of the main body 2 2.
- the restricting members 2 3 and 2 4 are supported by supporting means such as bolts while standing on the outer surface 2 2 a of the main body 2 2.
- recesses 8 3 and 8 4 are formed in the main body 2 2 to accommodate the tilted restricting members 2 3 and 2 4. May be.
- the depths of the receiving recesses 8 3 and 8 4 are such that the outer side surfaces 2 3 a and 2 4 a of the regulating members 2 3 and 2 4 that have been tilted are flush with the outer surface 2 2 a of the main body 2 2. It is preferable to decide.
- a retractable restricting member 24 may be formed at the end of the main body 75 having the opening 76.
- Fig. 13 B shows the state in which the regulating member 24 is tilted.
- the main body 75 is formed by two generally semicircular arc components 81 connected by bolts 80.
- the control member 2 4 is tilted to the opening 76 side and disassembled into two arc parts 8 1.
- the space required for transportation can be reduced by stacking two circular arc parts 81. If a plurality of circular arc parts 8 1 are stacked and transported, the main body 75 can be transported more efficiently with less space.
- a bent J-shaped part 8 5 that has two adjacent restricting members 2 3 and 2 4 integrally can be assembled to the main body 2 2 with bolts 8 6 etc. .
- a T-shaped regulating member 23 having an engagement plate 87 may be used.
- the attachment piece 88 engaged with the engagement plate 87 is formed so as to extend in the longitudinal direction of the main body 22.
- the regulating member 23 is attached to the main body 22 with the regulating member 23 protruding radially through 9.
- an elliptical main body 90 may be used as shown in FIG.
- the restricting members 2 3 and 24 are attached symmetrically with respect to the long axis of the ellipse.
- the vibration isolator may include a plurality of main bodies 2 2 each having restriction members 2 3 and 2 4. Adjacent bodies 22 are connected by flexible connecting wires 26a. If the annular flange 91 is formed at the upper end and the lower end of each main body 22, it becomes easy to connect the flange 91 of the adjacent main body 22 with the connecting wire 26 a. Since the plurality of main bodies 22 are not rigidly connected, each of the plurality of main bodies 2 2 can rotate to some extent independently. Therefore, the anti-vibration device shown in Fig. 13G is particularly effective when the direction of water flow differs depending on the water depth.
- the flange 9 1 can be made hollow, and the flange 9 1 can have a floating role.
- the restricting members 2 3 and 2 4 may be attached to the main body 2 2 so as to be inclined with respect to the outer surface 2 2 a of the main body 2 2.
- the regulating members 2 3 and 2 4 may be attached to the main body 2 2 so as to be inclined with respect to the longitudinal direction of the underwater pipe 1 3.
- the anti-vibration device 2 1 may be used for the pillars such as the offshore work platform 1 1 post 1 2 and bridge pillars.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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AU2002318522A AU2002318522A1 (en) | 2002-07-23 | 2002-07-23 | Vibration control equipment of underwater pipe |
PCT/JP2002/007423 WO2004009949A1 (ja) | 2002-07-23 | 2002-07-23 | 水中パイプの防振装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2002/007423 WO2004009949A1 (ja) | 2002-07-23 | 2002-07-23 | 水中パイプの防振装置 |
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WO2004009949A1 true WO2004009949A1 (ja) | 2004-01-29 |
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PCT/JP2002/007423 WO2004009949A1 (ja) | 2002-07-23 | 2002-07-23 | 水中パイプの防振装置 |
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WO (1) | WO2004009949A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102134972A (zh) * | 2010-12-31 | 2011-07-27 | 上海交通大学 | 仿鱼尾式整流罩的水下立管涡激振动抑制装置 |
WO2018231061A1 (en) | 2017-06-15 | 2018-12-20 | Bluemarine Offshore Yard Services B.V. | Viv suppression strake assembly |
CN111188815A (zh) * | 2020-02-08 | 2020-05-22 | 西南石油大学 | 一种大头鱼形开槽导流喷射与摆尾的抑振装置及方法 |
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JPS56157684A (en) * | 1980-05-07 | 1981-12-04 | Zeniraito V:Kk | Spar buoy |
JP3057360B2 (ja) * | 1997-08-19 | 2000-06-26 | 株式会社清水製作所 | 容器類の真空度検出装置 |
-
2002
- 2002-07-23 WO PCT/JP2002/007423 patent/WO2004009949A1/ja not_active Application Discontinuation
- 2002-07-23 AU AU2002318522A patent/AU2002318522A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56157684A (en) * | 1980-05-07 | 1981-12-04 | Zeniraito V:Kk | Spar buoy |
JP3057360B2 (ja) * | 1997-08-19 | 2000-06-26 | 株式会社清水製作所 | 容器類の真空度検出装置 |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102134972A (zh) * | 2010-12-31 | 2011-07-27 | 上海交通大学 | 仿鱼尾式整流罩的水下立管涡激振动抑制装置 |
CN102134972B (zh) * | 2010-12-31 | 2013-01-09 | 上海交通大学 | 仿鱼尾式整流罩的水下立管涡激振动抑制装置 |
WO2018231061A1 (en) | 2017-06-15 | 2018-12-20 | Bluemarine Offshore Yard Services B.V. | Viv suppression strake assembly |
NL2019077B1 (en) * | 2017-06-15 | 2018-12-24 | Bluemarine Offshore Yard Service Bv | VIV suppression strake assembly |
US10774949B2 (en) | 2017-06-15 | 2020-09-15 | Bluemarine Offshore Yard Service B.V. | VIV suppression strake assembly |
RU2753951C2 (ru) * | 2017-06-15 | 2021-08-24 | Блюмерин Оффшор Ярд Сёрвис Б.В. | Гребенчатый узел для подавления вибраций, вызванных вихреобразованием |
CN111188815A (zh) * | 2020-02-08 | 2020-05-22 | 西南石油大学 | 一种大头鱼形开槽导流喷射与摆尾的抑振装置及方法 |
CN111188815B (zh) * | 2020-02-08 | 2021-11-23 | 西南石油大学 | 一种大头鱼形开槽导流喷射与摆尾的抑振装置及方法 |
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