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WO2017196182A1 - Dispositif de bouée - Google Patents

Dispositif de bouée Download PDF

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Publication number
WO2017196182A1
WO2017196182A1 PCT/NO2017/050113 NO2017050113W WO2017196182A1 WO 2017196182 A1 WO2017196182 A1 WO 2017196182A1 NO 2017050113 W NO2017050113 W NO 2017050113W WO 2017196182 A1 WO2017196182 A1 WO 2017196182A1
Authority
WO
WIPO (PCT)
Prior art keywords
buoyancy
buoy
buoy device
turret
support structure
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.)
Ceased
Application number
PCT/NO2017/050113
Other languages
English (en)
Inventor
Arild Bech
Eirik Storvoll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Can Systems As
Original Assignee
Can Systems As
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from NO20160999A external-priority patent/NO341927B1/en
Application filed by Can Systems As filed Critical Can Systems As
Priority to US16/300,308 priority Critical patent/US10647390B2/en
Priority to GB1819542.0A priority patent/GB2565498B/en
Publication of WO2017196182A1 publication Critical patent/WO2017196182A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B22/00—Buoys
    • B63B22/02—Buoys specially adapted for mooring a vessel
    • B63B22/021—Buoys specially adapted for mooring a vessel and for transferring fluids, e.g. liquids
    • B63B22/026—Buoys specially adapted for mooring a vessel and for transferring fluids, e.g. liquids and with means to rotate the vessel around the anchored buoy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/02—Hulls assembled from prefabricated sub-units
    • B63B3/08—Hulls assembled from prefabricated sub-units with detachably-connected sub-units
    • 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
    • B63B21/507—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers with mooring turrets

Definitions

  • the invention concerns a buoy device as set out by the preamble of claim 1, and methods of assembling the buoy device, as set out by the preamble of claims 12 and 13.
  • the known turret buoy systems comprise a turret and a buoyant body, where the buoyant body is configured for connection to a receptacle in the vessel (e.g. the FPSO), and the turret is rotatably arranged inside the buoyant body via bearings (slewing bearings or sliding bearings).
  • the turret has connectors for mooring lines and support hang-off structures for risers.
  • Other variants, employing basically the same principle, are known within the industry.
  • the vessel when the buoyant body is connected to the vessel and the turret is moored to the seabed, the vessel is allowed to weathervane due to the rotational connection between the buoyant body and the turret.
  • the weathervaning capability is often advantageous, as it significantly expands the operational envelope for the vessel.
  • the buoyant body is provided with buoyancy chambers and provides support to the turret (including the risers and mooring lines) when the turret buoy is disconnected.
  • the buoyancy chambers are dimensioned to match the weight of the risers and mooring lines to ensure buoyancy equilibrium at a required submerged depth.
  • WO 93/22190 describes a buoy for use in loading or unloading of a flowable medium, especially oil, comprising an outer buoyancy member arranged to be introduced and secured in a submerged downwardly open receiving space in a floating vessel, and a central member which is rotatably mounted in the outer member and is intended for anchoring to the sea bed and arranged for passage of medium between a transfer line which, in operation, is coupled to the lower end of the central member and a tube system on the vessel.
  • the central member is provided with a lower extension body having an outer peripheral portion abutting on and essentially corresponding to the outer periphery of the adjacent end of the outer buoyancy member, and having a lower portion which is downwardly tapering from the outer peripheral portion.
  • a number of fastening means for fastening of the upper ends of anchoring lines for anchoring of the buoy are fastened at intervals along the periphery of the outer peripheral portion of the extension body, and the extension body comprises at least one buoyancy chamber for buoyancy or ballast material.
  • the prior art also includes WO 2009/031971 , which describes a mooring system for a vessel and a method of mooring a vessel.
  • the mooring system comprises a turret structure; a swivel unit mounted on the turret structure; a bearing assembly for rotatably mounting the turret structure at deck level of the vessel such that the turret structure extends into a moonpool of the vessel and such that the swivel unit is disposed above deck level; a plurality of conduits for fluid communication disposed in the turret structure; a buoy structure, with internal buoyancy compartments, retrievable into the moonpool of the vessel and connectable to the turret structure; a locking assembly for mechanically locking the buoy structure to the turret structure.
  • the turret structure is rotatable as one to align the conduits to corresponding riser valve structures on the buoy structure prior to mechanically locking the buoy structure to the turret structure.
  • CALM Catenary Anchor Leg Mooring
  • SPM Single Point Mooring
  • a bearing e.g. slewing bearing or sliding bearing
  • Flexible large bore rubber hoses are used to connect the subsea pipeline to the hull. Similar floating hoses are employed when connecting the buoy to a tanker prior to transferring liquid hydrocarbons.
  • a product swivel Central to the main bearing is a product swivel which allows fluid to transfer between the geostationary hull and rotating turntable while the moored vessel weathervanes.
  • the prior art includes WO 2014/180687 Al, which shows a mooring system comprising an external turret (to which a production vessel is moored) from which a buoyant body may be connected and disconnected.
  • WO 2011/042535 Al discloses a CALM buoy having a floating body anchored to the sea bed via two or more anchor lines.
  • the floating body comprises a lower part to be situated below water level and an upper part to be situated above water level.
  • a turntable is rotatably attached to the floating body upper part via a bearing, the turntable comprising mooring points and fluid transfer means.
  • the floating body is a circular hull, having internal buoyancy chambers.
  • the turret buoy and the CALM buoy to some extent have different technical features and are used for different purposes, they rely on the common principle that one part is moored to the seabed (i.e. more or less geostationary) and another part is connectable to a ship, and the two parts are rotatably connected.
  • the geostationary part is the turret and the buoyant body is connected to the ship.
  • the buoyant body is moored to the seabed, while the turntable is connected to the ship.
  • Known buoy devices of the kind described above are large, heavy, structures, with heights on the order of 10 to 15 metres and maximum diameters up to 15 metres.
  • the buoys must be designed with a certain degree of contingency, i.e. in the event one or more of the buoyancy chambers are compromised (e.g. as a result of collision or dropped objects), the known buoys normally have several buoyancy chambers, separated by internal bulkheads. This adds weight and fabrication time. Typical dry weights range between 100 and 1500 Tonnes. Time, equipment, and manpower (and hence cost) required to construct, transport and install known buoy devices are therefore considerable. It is an object of the invention to present a buoy which alleviates at least some of the disadvantages with the prior art.
  • a buoy device comprising a first part having a first support structure; a second part having buoyancy means and a second support structure; and the first and second support structures are connectable via rotation and support means to form a rotatable connection between the first part and the second part; characterized in that
  • the buoyancy means comprises a plurality of buoyancy elements
  • the second support structure comprises a base member configured to support the buoyancy elements
  • the buoyancy elements comprise locking means for releasably locking the buoyancy elements to each other and/or to the second part.
  • the second support structure comprises a central column, and the buoyancy elements are arranged around the central column.
  • the buoyancy element's inner side has a curved surface, corresponding to and complementary with the cylindrical surface of the central column.
  • the buoyancy element may comprise a stiff outer shell, enclosing one or more internal buoyancy tanks.
  • the buoyancy element may comprise a buoyant material covered by an outer casing.
  • the buoyant material may comprise polyurethane foam.
  • the outer casing may for example comprise a fibreglass (e.g. GRP) shell, or a shell of another light-weight material.
  • the buoy device further comprises locking means for releasably locking the buoyancy elements to each other and/or to the second part.
  • the first part comprises mooring connectors, configured for connection to anchor chains or lines, by means of which the first part may be moored to a seabed; and the second, buoyant, part comprises connection means whereby the second part may be releasably connected to a vessel, such as a ship.
  • the buoy device may in this embodiment be a turret buoy and the first part a turret.
  • the second, buoyant, part comprises an upper deck structure and ship interface devices.
  • the second, buoyant, part may comprise mooring connectors, configured for connection to anchor chains or lines, by means of which the second part may be moored to a seabed; and the first part may comprise connection means whereby the second part may be releasably connected to a vessel, such as a ship.
  • the buoy device may in this embodiment be a Catenary Anchor Leg Mooring (CALM) buoy and the first part a turntable.
  • CALM Catenary Anchor Leg Mooring
  • a method of assembling the buoy device according to the second embodiment of the invention characterized by the steps of: a) placing the second part on a support structure, for example a vessel deck;
  • the invented buoy device is considerably lighter that the known buoys, and provides several advantages over the prior art:
  • the foam-filled buoyancy module does not lose its buoyancy even if its outer shell is punctured. If, however, a buoyancy module is damaged, it can be replaced by another buoyancy module stored. Spare buoyancy modules may be stored on board the vessel, or may be shipped in as and when required.
  • buoyancy modules may be
  • Lifting weights during assembly is significantly reduced, particularly when lifting the buoy is to be lifted onto the turret, because the buoyancy elements can be assembled when the buoy (i.e. column) and turret have been interconnected.
  • Final assembly i.e. installing the buoyancy elements
  • buoyancy can be controlled and adjusted on site, by removing one or more buoyancy elements, or by installing buoyancy elements with lesser buoyancy.
  • Fender members may be incorporated into the buoyancy elements.
  • figure 1 is a perspective view of an embodiment of the invented turret buoy, in an assembled state
  • figure 2 is a perspective view of the embodiment illustrated in figure 1 , but where two buoyancy elements have been detached from the turret buoy
  • figure 3 is a perspective view of the embodiment illustrated in figures 1 and 2, but where two buoyancy elements have been removed and a portions of the turret column and the buoy column have been cut away in order to display the risers being arranged inside the turret
  • figures 4 and 5 are exploded views of the embodiment illustrated in figures 1-3
  • figure 6 is a perspective view of the embodiment illustrated in figures 1-5, but where all buoyancy elements have been removed
  • figure 7 is a perspective view of another embodiment of the invention, in the form of a turntable buoy
  • figure 8 is an off-center sectional drawing of the embodiment illustrated in figure 7
  • figure 9 is an exploded view of the
  • the invented buoy device comprises in one embodiment a turret buoy 1 having a turret 20 and a buoyant body 30.
  • the turret 20 comprises a base portion 21, having a plurality of mooring connectors 22 to which mooring lines or chains (not shown) may be attached.
  • the figure shows a base portion having four groups of mooring connectors 22 arranged at regular intervals around the base portion perimeter, each group consisting of five mooring connectors. It should be understood that more or fewer mooring connectors and configurations may be used.
  • the base portion 21 may also comprise internal ballast tanks (not shown). Extending upwards from the base portion 21 is a turret column 23 having an inner core 26.
  • the annulus 25 between the inner core and the column inner wall is configured for accommodating and supporting risers (not shown in figure 4) in a manner which is well known in the art.
  • the buoyant body 30 comprises a base member 37, and a central column 31 extending upwards from the base member.
  • the turret column 23 and central column 31 are dimensioned and configured such that the turret column 23 can be rotatably
  • Upper and lower bearings 24a,b are arranged on the turret column 23 and configured for rotatingly supporting the turret column 23 in the central column 31, and forming a rotatable (e.g. slewing or sliding) connection in which the turret 20 and buoyancy member 30 are allowed to rotate independently of one another.
  • Such bearings are well known in the art.
  • Required interlocking means are not illustrated, as such means are well known in the art and not part of the invention per se. Swivel connection between risers and other piping are also not illustrated, as such swivel connections are well known in the art.
  • the turret base portion 21, turret column 23, base member 37 and central column 31 may be manufactured from materials that are capable of withstanding the considerable forces involved in mooring a vessel, such as an FPSO ship. Suitable materials in that respect would be high- strength steel.
  • buoyancy elements 34 Arranged around the central column 31 is a plurality of buoyancy elements 34.
  • the buoyant body 30 holds six buoyancy elements 34, but it should be understood that the fewer or more buoyancy elements may be used.
  • the buoyancy elements 34 may be made of a buoyant material, such as polyurethane foam, and covered by a fibreglass (e.g. GRP) shell.
  • GRP fibreglass
  • a particular advantage of this variant is that buoyancy is not compromised even if the shell is punctured. Leak testing, which is necessary with the prior art, is not required, and the total fabrication time is significantly reduced, compared to the prior art.
  • the buoyancy elements 34 may also be made of a stiff outer shell, enclosing one or more internal buoyancy tanks.
  • the individual buoyancy elements 34 may be prefabricated, and transported and installed on the mobilization site. It will be understood that the buoyancy elements may have other shapes than those illustrated.
  • Figure 1 shows an assembled turret buoy, ready for installation in a vessel and connection to mooring lines.
  • Reference numbers 32 and 33 indicate hull interface (i.e. contact) portions, where the buoyancy member 30 is connected to the vessel hull opening.
  • the turret buoy 1 may be pulled into, and locked into, a corresponding recess in the vessel hull (not shown), in a manner which is well known in the art.
  • FIG 2 two buoyancy elements 34a,b have been detached from the turret buoy 1.
  • FIG 3 two buoyancy elements have been removed and portions of the turret column 23 and the central column 31 has been cut away in order to illustrate how the risers 2 are arranged inside the turret 20.
  • the risers 2 (only parts of which are shown in figure 3) are extended through, and suspended by, the turret 20 and connected to a swivel (not shown) in a manner which is well known in the art, and will therefore not be discussed here.
  • each buoyancy element 34 is installed on the buoyant body 30 by placing the buoyancy elements side by side around the central column 31, the lower ends resting on the base member 37 and the inner sides bearing against the central column 31.
  • the buoyancy element's inner side has a curved surface, corresponding to and complementary with the cylindrical surface of the central column 31.
  • the central column comprises a first retaining rim 35, arranged in the region of the top of the central column 31, and the base member 37 comprises a second retaining rim 36, arranged in the region of the base member perimeter.
  • each buoyancy element 34 When installing a buoyancy element 34, therefore, the upper part may be inserted behind the first retaining rim 35 and lifted upwards such that the lower part of the buoyancy element may be moved across and behind the lower retaining rim 36, whereupon the buoyancy element is lowered into abutment with the base member.
  • each buoyancy element 34 is furnished with grooves 38 in which a suitable strap may be placed. By extending the strap around the buoyant body, all of the buoyancy elements may be strapped tightly to the central column 31.
  • a suitable strap is a Roblon ® Clamp Strap, manufactured and sold by Roblon A/S. It should be understood that other fastening means and support means, as well as installation methods, are conceivable within the ambit of the invention.
  • each buoyancy element may be connected to its adjacent buoyancy element by means of individual clasps or turnbuckles.
  • the invented turret buoy may thus be fabricated in separate parts, and assembled by: a) placing the turret 20 on a support structure, for example a vessel deck (not
  • a typical turret buoy according to the present invention may have an overall height of 10 to 15 metres, a maximum diameter of about 15 metres and a total dry weight of 100 to 1000 tonnes or more; providing a net buoyancy in the range 100 to 1500 tonnes.
  • the invention shall, however, not be limited to these dimensions.
  • the invented turret buoy easily may be modified into at CALM turret buoy.
  • the buoyant body 30, which in figure 1 is shown to have a frusto-conical shape may be given a more cylindrical shape and/or be provided with an upper deck structure and the ship interface devices normally associated with such CALM turret buoys.
  • the invention has been described above with reference to a turret buoy in which the turret is moored to the seabed (i.e. the "geostationary part") and the buoyant body is connected to the vessel - either as a turret buoy or as a CALM buoy, it should be understood that the invention is equally applicable to buoy systems in which the buoyant body is moored to the seabed.
  • One example of such systems is the CALM buoy having a turntable, an embodiment of which will be described in the following with reference to figures 7-9.
  • the CALM turntable buoy 50 basically comprises a buoyant body 70 which is supporting a turntable 60.
  • the turntable 60 comprises a platform 61, hand rails 62 and a boat landing area 63 for providing access for personnel.
  • a ship connection interface 64 is provided, via which a ship (e.g. an oil tanker) may be moored to the turntable via mooring lines (not shown), in a manner which per se is known in the art.
  • the buoyant body 70 comprises a base member 77, which is provided with mooring connectors 72, by means of which the base member may be connected to seabed anchors (not shown) via mooring lines in a manner which per se is known in the art.
  • the base member is a circular and disk- shaped, but the invention shall not be limited to such shape.
  • Extending from the base member 77 is a central column 71, which in turn is connected to and supports a turntable support member 73.
  • a turntable interface column 75 extends from the turntable support member 73 and is structurally an extension on the central column 71.
  • a bearing 3 (see figure 9) is arranged around the turntable interface column 75.
  • Risers 2 extend (from the seabed, not shown) through the central column 71 and are connected to fluid lines 66 via a swivel 67 (see figure 8), in a manner which per se in known in the art.
  • the fluid lines 66 terminate in a fluid line connection interface 66, to which loading hoses (not shown) may be connected.
  • the turntable 60, base member 77, central column 71, turntable support member 73 and turntable interface columns 75 may be manufactured from materials that are capable of withstanding the considerable forces involved in mooring a vessel. Suitable materials in that respect would be high- strength steel.
  • buoyancy elements 74 Arranged around the central column 71 is a plurality of buoyancy elements 74.
  • the buoyant body 70 holds six buoyancy elements 74, but it should be understood that the fewer or more buoyancy elements may be used.
  • the buoyancy elements 74 may be made of a buoyant material, such as polyurethane foam, and covered by a fibreglass (e.g. GRP) shell.
  • GRP fibreglass
  • a particular advantage of this variant is that buoyancy is not compromised even if the shell is punctured. Leak testing, which is necessary with the prior art, is not required, and the total fabrication time is significantly reduced, compared to the prior art.
  • the buoyancy elements 74 may also be made of a stiff outer shell, enclosing one or more internal buoyancy tanks.
  • the individual buoyancy elements 74 may be prefabricated, and transported and installed on the mobilization site. It will be understood that the buoyancy elements may have other shapes than those illustrated.
  • each buoyancy element 74 is installed on the buoyant body 70 by placing the buoyancy elements side by side around the central column 71, the lower ends resting on the base member 77 and the inner sides bearing against the central column 71.
  • the buoyancy element's inner side has a curved surface, corresponding to and complementary with the cylindrical surface of the central column.
  • each buoyancy element 74 is furnished with recessed and tangentially oriented holes 78, by means of which adjacent buoyancy elements 74 may be interconnected (via bolts, or similar; not shown). Other fastening means, serving to fasten the buoyant bodies to the central column 71, may be used.
  • the invented turntable buoy may thus be fabricated in separate parts, and assembled by: a) placing the buoyant body 70 on a support structure, for example a vessel deck (not shown);

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

L'invention concerne un dispositif de bouée (1) qui comprend une première partie (20) ayant une première structure de support (21, 23, 24a, b) et une seconde partie (30) ayant un moyen de flottabilité et une seconde structure de support (31, 37). Les première et seconde structures de support peuvent être reliées pour former une liaison rotative entre la première partie et la seconde partie. Le moyen de flottabilité comprend un ou plusieurs éléments de flottabilité (34) disposés amovible sur la seconde partie (30). Le dispositif de bouée peut être une bouée de tourelle, une bouée de tourelle CALM ou une bouée de plaque tournante CALM.
PCT/NO2017/050113 2016-05-10 2017-05-09 Dispositif de bouée Ceased WO2017196182A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US16/300,308 US10647390B2 (en) 2016-05-10 2017-05-09 Buoy device
GB1819542.0A GB2565498B (en) 2016-05-10 2017-05-09 A buoy device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NO20160788 2016-05-10
NO20160788 2016-05-10
NO20160999A NO341927B1 (en) 2016-05-10 2016-06-14 A buoy device
NO20160999 2016-06-14

Publications (1)

Publication Number Publication Date
WO2017196182A1 true WO2017196182A1 (fr) 2017-11-16

Family

ID=59067866

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2017/050113 Ceased WO2017196182A1 (fr) 2016-05-10 2017-05-09 Dispositif de bouée

Country Status (1)

Country Link
WO (1) WO2017196182A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114275102A (zh) * 2021-12-07 2022-04-05 西安精密机械研究所 一种北斗信标浮体用分离结构
CN116176771A (zh) * 2023-04-23 2023-05-30 山东港口烟台港集团有限公司 一种船舶航行引导用指示牌

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993022190A1 (fr) 1992-04-30 1993-11-11 Den Norske Stats Oljeselskap A.S. Bouee de chargement/dechargement
US5564957A (en) * 1991-11-27 1996-10-15 Den Norske Stats Oljeselskap A.S. System for offshore loading/unloading of a flowable medium, especially oil
WO2000073133A1 (fr) * 1999-05-27 2000-12-07 Trident Offshore Ltd. Bouee a amarrage par pied d'ancrage catenaire
WO2009031971A1 (fr) 2007-09-07 2009-03-12 Prosafe Production Pte. Ltd. Système d'ancrage de navire et procédé d'ancrage de navire
WO2011042535A1 (fr) 2009-10-08 2011-04-14 Single Buoy Moorings Inc. Bouée calm
WO2014103557A1 (fr) * 2012-12-26 2014-07-03 独立行政法人石油天然ガス・金属鉱物資源機構 Structure flottante
WO2014180687A1 (fr) 2013-05-06 2014-11-13 Single Buoy Moorings Inc. Système de tourelle déconnectable de profondeur à configuration de colonne montante rigide de type "lazy wave"

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5564957A (en) * 1991-11-27 1996-10-15 Den Norske Stats Oljeselskap A.S. System for offshore loading/unloading of a flowable medium, especially oil
WO1993022190A1 (fr) 1992-04-30 1993-11-11 Den Norske Stats Oljeselskap A.S. Bouee de chargement/dechargement
WO2000073133A1 (fr) * 1999-05-27 2000-12-07 Trident Offshore Ltd. Bouee a amarrage par pied d'ancrage catenaire
WO2009031971A1 (fr) 2007-09-07 2009-03-12 Prosafe Production Pte. Ltd. Système d'ancrage de navire et procédé d'ancrage de navire
WO2011042535A1 (fr) 2009-10-08 2011-04-14 Single Buoy Moorings Inc. Bouée calm
WO2014103557A1 (fr) * 2012-12-26 2014-07-03 独立行政法人石油天然ガス・金属鉱物資源機構 Structure flottante
WO2014180687A1 (fr) 2013-05-06 2014-11-13 Single Buoy Moorings Inc. Système de tourelle déconnectable de profondeur à configuration de colonne montante rigide de type "lazy wave"

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114275102A (zh) * 2021-12-07 2022-04-05 西安精密机械研究所 一种北斗信标浮体用分离结构
CN114275102B (zh) * 2021-12-07 2023-07-21 西安精密机械研究所 一种北斗信标浮体用分离结构
CN116176771A (zh) * 2023-04-23 2023-05-30 山东港口烟台港集团有限公司 一种船舶航行引导用指示牌
CN116176771B (zh) * 2023-04-23 2023-08-11 山东港口烟台港集团有限公司 一种船舶航行引导用指示牌

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