CN103395476A - Method for mounting submerged buoy in ultra-deep water - Google Patents
Method for mounting submerged buoy in ultra-deep water Download PDFInfo
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- CN103395476A CN103395476A CN2013103546287A CN201310354628A CN103395476A CN 103395476 A CN103395476 A CN 103395476A CN 2013103546287 A CN2013103546287 A CN 2013103546287A CN 201310354628 A CN201310354628 A CN 201310354628A CN 103395476 A CN103395476 A CN 103395476A
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Abstract
The invention discloses a method for mounting a submerged buoy in ultra-deep water. The method comprises the steps of preparation work, mooring system mounting, location and sinking of the buoy, connection between the mooring system and the buoy, and regulation of length of an anchor leg. The invention discloses the feasible scheme for mounting the submerged buoy in the ultra-deep water, an auxiliary anchor chain is not used for controlling the movement of the buoy, but a ballast system is used for controlling the buoy to stably sink, as a result, that the cost and man-hour are increased due to the use of the auxiliary anchor chain, is avoided. According to the method disclosed by the invention, the mooring system is connected with the buoy by matching lifting hooks and ring-shaped buckles, operation difficulty is lowered, the lifting hooks and the ring-shaped buckles are operated in a water depth approaching the submergence depth of the buoy, and the method is easier to operate compared with technology realizing connection on seabed. During the whole mounting process, the working area of remote operated vehicles is not deeper than the submergence depth of the buoy, so that the problems in the prior art of the pressure resistance and safety of the remote operated vehicles working under the sea level are avoided.
Description
Technical field
The present invention relates to a kind of field engineering of super deep water oil exploration equipment, particularly the installation method of a kind of subduction floating drum in super deep water.
Background technology
Floating drum has a wide range of applications in the Naval Architecture and Ocean Engineering field, floating drum for detachable inner cupola (have buoyancy, be installed on the mooring gear of hull interior) mooring, floating drum needs at FPSO(water surface floating type process units) be installed on certain depth under water before in place, effect is installed directly affects the safety of FPSO mooring.The Deepwater Risers of FPSO is installed and is utilized floating drum as brace foundation in the water of standpipe, has reduced the oscillatory response of point of connection.Floating drum need to be arranged on certain depth under water, and the underwater stability of floating drum can directly have influence on the stability of standpipe.
At present, the exploitation water depth of Chinese vessel and platform is more shallow, operation ship type is more single, but the exploitation along with South China Sea, boats and ships and platform operation are expanded to deep water and super deep water (greater than 1500m), and the floating drum field engineering of corresponding deep water and super deep water sea area is also demanded exploitation urgently.
The subject matter that in super deep water situation, the subduction floating drum is installed is the method for controlling floating drum stable sinking in water, locating and with mooring system, be connected.
Existing method general step is: at first deep-seaanchor is arranged on seabed, and floating drum is anchored with auxiliary anchor chain, connect the anchor leg on floating drum, anchor leg lower end connects counterweight, then make it to injecting ballast water in floating drum, transfer simultaneously the anchor leg, until counterweight arrives seabed, anchor leg lower end is connected with deep-seaanchor, reclaims finally auxiliary anchor chain.
The subject matter that existing method exists is:
1, need to use auxiliary anchor chain to floating drum the motion in water control, the installation of auxiliary anchor chain under super deep water conditions, auxiliary anchor chain and floating drum be connected and the recovery of auxiliary anchor chain need to consume a large amount of man-hours, greatly increased the cost of floating drum installation.
2, the attended operation of anchor leg and anchor is carried out in seabed, to under-water robot (RemoteOperated Vehicles, abbreviation ROV) resistance to pressure of super deepwater work, safety has relatively high expectations, during floating drum is installed under water, many action need under-water robots are completed, whether smooth progress and the cost that directly has influence on operation of its super deep-water operation.
Summary of the invention
The problems referred to above that exist for solving prior art, the present invention will design a kind ofly not only can reduce cost of installation, but also can avoid the installation method of subduction floating drum in super deep water of the super deepwater work of the use of auxiliary anchor chain and under-water robot.
To achieve these goals, technical scheme of the present invention is as follows: the installation method of a kind of subduction floating drum in super deep water, a plurality of ballast tanks are arranged in described floating drum, injecting ballast water can make floating drum sink, injecting gas, discharge ballast water can make the floating drum floating, and concrete installation method comprises the following steps:
A, preparation work
When floating drum is built at shipyard, towing system, chain cable compressor and anchor chain pulley are installed in advance on floating drum, at each anchor leg point of connection of floating drum, two floating drum pre-installation chain segment are installed, be used for next and being connected of ballasting system.Floating drum is carried out the part ballast, check, rinse ballast line and gas injection pipeline.With towboat, floating drum is towed to the target marine site; All repair ship is in place;
B, anchoring system are installed
B1, by two repair ship cooperations operation of casting anchor, a repair ship is transferred to deep-seaanchor marine, the deep-seaanchor opposite side connects and mixes the anchor leg, described mixing anchor leg consists of bottom chain section, anchor hawser and part top chain section, transfer the anchor leg by another repair ship when transferring deep-seaanchor, part top chain section end is connected by transom with auxiliary buoy, interim rope, the auxiliary buoy below is latch closure, be used for being connected cooperation with suspension hook, chain segment is connected to repair ship by the operation hawser;
B2, carry out routine work deep-seaanchor is arranged on seabed, anchor hawser tensioning under the auxiliary buoy buoyancy, repair ship tensioning operation hawser makes anchor hawser have certain inclination angle in water;
B3, according to the actual requirement of buoy anchoring, by the method for step B1, B2, all anchoring systems are installed;
In place and the sinking of C, floating drum
C1, use towboat tow to attachment point with floating drum;
C2, the auxiliary connection of completing ballasting system of repair ship of use, described ballasting system comprises kentledge, the chain segment that is connected with kentledge, rope and operation hawser temporarily, another part top chain Duan Xianyu floating drum pre-installation chain segment is connected, connect interim rope, chain segment, kentledge and operation hawser on repair ship, the operation hawser extends to repair ship again; Interim rope is connected by transom with the part top chain section of floating drum; The transom below suspension hook that dangles, be used for being connected with auxiliary buoy below latch closure;
Return to the beginning of step C2, the connection of all ballasting systems that used the same method and release;
C3, to water filling in ballast tank, under the effect of kentledge and part top chain section, the stable sinking of floating drum, by regulating the length of operation hawser, and the distance of repair ship and floating drum, can the ballast power of regulating action on floating drum, in the repair ship moving process, keep under water the position of auxiliary buoy and the inclination angle of anchor hawser; For all working ship, the adjusting of operation cable length, the control of repair ship and floating drum distance is carried out simultaneously;
D, anchoring system are connected with floating drum
D1, floating drum sink down into auxiliary buoy top certain altitude, with ROV, carry out being connected of suspension hook and latch closure, connect complete, the interim rope that disconnection is connected with the anchor leg; Carry out being connected of all anchoring systems and floating drum by step D1;
D2, discharge the water in ballast tank, all ballasting systems are carried out folding and unfolding and adjusting simultaneously, under ballasting system is controlled, make the stable floating of floating drum until all anchor leg tensionings, disconnect the interim rope of all ballasting systems with ROV; So far, complete the preliminary installation of floating drum;
The adjusting of E, anchor leg length
After the measurement installation, the inclination angle of floating drum,, if do not meet engineering discipline, need to regulate the anchor leg length;
E1, ballasting system is connected with another root chain segment of floating drum pre-installation, all ballasting systems carry out same connection;
Distance between E2, adjusting repair ship and floating drum and the length of operation hawser, re-start ballast to floating drum, and all working ship carries out synchronous operation;
E3, operation hawser are connected with floating drum pre-installation chain segment upper end, use ROV, open chain cable compressor, extract the anchor chain of design length out, close chain cable compressor, clamp anchor chain;
E4, if necessary, regulate the length of other anchor legs according to step e 1-E3;
E5, cut off the interim rope of all ballasting systems.
The present invention has the following advantages:
1, the present invention proposes the feasible mount scheme of subduction floating drum in super deep water of cover, domestic not yet having complete, complete technology aspect the super deep water installation of floating drum, the present invention need to be applicable to the installation of the underwater floating drum of tensioning mooring, for super deepwater oil-gas development, the production operation of carrying out based on floating drum from now on provides the field engineering thinking.
2, the present invention does not use auxiliary anchor chain to move and control floating drum, but uses ballasting system to control the stable sinking of floating drum.Thereby avoided auxiliary anchor chain to use the cost that causes, the increase in man-hour.
3, the present invention has realized being connected of anchoring system and floating drum by suspension hook and the cooperation of latch closure, has reduced task difficulty, and the depth of water that suspension hook and latch closure are operated, than the technology that connects in seabed, is easier to operation near the floating drum submergence depth.In whole installation process, the operating area of under-water robot the floating drum submergence depth and more than, avoided the resistance to pressure that in the prior art, under-water robot brings at seabed operation, safety issue.
Description of drawings
8, the total accompanying drawing of the present invention, wherein:
Fig. 1 is the schematic diagram after anchoring system installation of the present invention.
Fig. 2 is the schematic diagram that ballasting system of the present invention connects.
Fig. 3 is the schematic diagram of floating drum ballast of the present invention.
Fig. 4 is the schematic diagram that suspension hook of the present invention is connected with latch closure.
Fig. 5 is recovery auxiliary buoy of the present invention, cuts off the schematic diagram of the interim rope that is connected with the anchor leg.
Fig. 6 is the schematic diagram after discharge floating drum ballast water of the present invention.
Fig. 7 is the schematic diagram of the interim rope of cut-out ballasting system of the present invention.
Fig. 8 is the ballasting system that reconnects of the present invention, regulates the schematic diagram of anchor leg length.
in figure: 1, repair ship A, 2, deep-seaanchor, 3, the anchor leg, 4, auxiliary buoy, 5, the bottom chain section, 6, anchor hawser, 7, part top chain section A, 8, interim rope A, 9, transom A, 10, latch closure, 11, chain segment A, 12, operation hawser A, 13, suspension hook, 14, towboat, 15, floating drum, 16, kentledge, 17, chain segment B, 18, interim rope B, 19, operation hawser B, 20, transom B, 21, part top chain section B, 22, floating drum pre-installation chain segment A, 23, the operation ship, 24, ROV, 25, floating drum pre-installation chain segment B, 26, chain cable compressor, 27, the anchor chain pulley, 28, repair ship B, 29, repair ship C, 30, operation hawser C.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is described further.The present invention illustrate to have three anchor leg point of connection floating drum be installed as example.
As shown in Figure 1,, by the cooperation of repair ship A1 and repair ship B28, complete the installation of synchronizeing of deep-seaanchor 2 and anchor leg 3.Anchor leg 3(comprises bottom chain section 5, anchor hawser 6, part top chain section A7) under the effect of auxiliary buoy 4 and chain segment A11, keep tensioning in water, and inclination certain angle, make latch closure 10 keep certain position in water, convenience is connected with suspension hook 13, and prevents from producing and interfering between different anchor legs.
As shown in Figure 2, under the booster action of another repair ship C29, carry out the connection of three groups of ballasting systems, floating drum 15 each point of connection are installed two chain segment in advance, take a point of connection as example, floating drum pre-installation chain segment A22 is used for when floating drum 15 is installed being connected with ballasting system (comprise kentledge 16, the chain segment B17 that is connected with kentledge, restrict B18, operation hawser B19) temporarily, and floating drum pre-installation chain segment B25 is connected with ballasting system during for adjusting anchor leg 3 length.
As shown in Figure 3, after ballasting system (comprise kentledge 16, the chain segment B17 that is connected with kentledge, restrict B18, operation hawser B19) temporarily has been connected, adopt kentledge 16 and part top chain section B21 to carry out ballast to floating drum 15,, to the interior injection ballast water of floating drum 15, make the stable sinking of floating drum 15.In the ballast process, the folding and unfolding of all ballasting systems and adjusting are carried out simultaneously.
As shown in Figure 4, floating drum 15 sinks, navigates to auxiliary buoy 4 tops, and operation ship 23 is in place, with ROV24, carries out being connected of suspension hook 13 and latch closure 10.Other group suspension hooks are identical with the method for attachment of latch closure.
As shown in Fig. 5-7, reclaim auxiliary buoy 4, the interim rope A8 that cut-out is connected with anchor leg 3, and the interior ballast water of discharge floating drum 15, floating drum 15 rises until meet the requirement of three anchor leg tensile forces, cut off temporarily the restrict interim rope of B18 and other ballasting systems of ballasting system with ROV24, complete the preliminary installation of floating drum.
As shown in Figure 8, ballasting system is connected with floating drum pre-installation chain segment B25 on floating drum 15, again floating drum 15 is carried out ballast, operation hawser C30 is connected with floating drum pre-installation chain segment A22 upper end,, by regulating the length of floating drum pre-installation chain segment A22, realize the adjusting at anchor leg 3 length and floating drum 15 inclination angles., for graphic floating drum 15, may relate at most the adjusting of two anchor leg lengths.Cut off the interim rope of whole ballasting systems, complete the final installation of floating drum 15.
The installation method of a kind of subduction floating drum in super deep water comprises the following steps:
A, preparation work
When floating drum 15 is built at shipyard, towing system, chain cable compressor 26 and anchor chain pulley 27 are installed in advance on floating drum 15, each anchor leg point of connection at floating drum 15 is installed floating drum pre-installation chain segment A22 and floating drum pre-installation chain segment B25, is used for next and being connected of ballasting system.Floating drum 15 is carried out the part ballast, check, rinse ballast line and gas injection pipeline.With towboat 14, floating drum 15 is towed to the target marine site.All repair ship is in place;
B, anchoring system are installed
B1, by repair ship A1 and repair ship B28, cooperate the operation of casting anchor, repair ship A1 transfers to deep-seaanchor 2 marine, deep-seaanchor 2 opposite sides connect and mix anchor leg 3, described mixing anchor leg 3 consists of bottom chain section 5, anchor hawser 6 and part top chain section A7, transfer anchor leg 3 by repair ship B28 when transferring deep-seaanchor 2, part top chain section A7 end is with auxiliary buoy 4, the A8 that restricts is connected by transom A9 temporarily, auxiliary buoy 4 belows are latch closure 10, be used for being connected cooperation with suspension hook 13, chain segment A11 is connected to repair ship B28 by operation hawser A12;
B2, carry out routine work deep-seaanchor 2 is arranged on seabed, anchor hawser 6 tensionings under auxiliary buoy 4 buoyancys, repair ship B28 tensioning operation hawser A12 makes anchor hawser 6 have certain inclination angle in water;
B3, according to the actual requirement of floating drum 15 anchoring, by the method for step B1, B2, all anchoring systems are installed;
In place and the sinking of C, floating drum 15
C1, use towboat 14 tow to attachment point with floating drum 15;
C2, the auxiliary connection of completing ballasting system of repair ship C29 of use, described ballasting system comprises kentledge 16, the chain segment B17 that is connected with kentledge, restrict B18 and operation hawser B19 temporarily, part top chain section B21 first is connected with floating drum pre-installation chain segment A22, connect interim rope B18, chain segment B17, kentledge 16 and operation hawser B19 on repair ship C29, operation hawser B19 extends to repair ship B28 again; Interim rope B18 is connected by transom B20 with the part top chain section B21 of floating drum 15; The transom B20 below suspension hook 13 that dangles, be used for being connected with auxiliary buoy 4 below latch closures 10;
Return to the beginning of step C2, the connection of all ballasting systems that used the same method and release;
C3, to water filling in ballast tank, under the effect of kentledge 16 and part top chain section B21, the stable sinking of floating drum 15, by regulating the length of operation hawser B19, and the distance of repair ship B28 and floating drum 15, can the ballast power of regulating action on floating drum 15, in repair ship B28 moving process, keep under water the position of auxiliary buoy 4 and the inclination angle of anchor hawser 6; For all working ship, the adjusting of operation cable length, the control of repair ship and floating drum distance is carried out simultaneously;
D, anchoring system are connected with floating drum 15
D1, floating drum 15 sink down into auxiliary buoy 4 top certain altitudes, with ROV24, carry out being connected of suspension hook 13 and latch closure 10, connect completely, disconnect the interim rope A8 that is connected with anchor leg 3.Carry out being connected of all anchoring systems and floating drum 15 by step D1;
Water in D2, discharge ballast tank, all ballasting systems are carried out folding and unfolding and adjusting simultaneously, under ballasting system is controlled, make floating drum 15 stable floatings until all anchor leg tensionings disconnect the interim rope B18 of ballasting system and the interim rope of other ballasting systems with ROV24; So far, complete the preliminary installation of floating drum 15;
The adjusting of E, anchor leg 3 length
After the measurement installation, the inclination angle of floating drum 15,, if do not meet engineering discipline, need to regulate anchor leg 3 length.
E1, ballasting system is connected with floating drum pre-installation chain segment B25, all ballasting systems carry out same connection;
Distance between E2, adjusting repair ship B28 and floating drum 15 and the length of operation hawser B19, re-start ballast to floating drum 15, and all working ship carries out synchronous operation;
E3, operation hawser C30 are connected with floating drum pre-installation chain segment A22 upper end, use ROV24, open chain cable compressor 26, extract the anchor chain of design length out, close chain cable compressor 26, clamp anchor chain;
E4, if necessary, regulate the length of other anchor legs according to step e 1-E3;
E5, the interim rope B18 that cuts off ballasting system and the interim rope of other ballasting systems.
So far, a kind of subduction floating drum installing in super deep water.
Claims (1)
1. the installation method of a subduction floating drum in super deep water, described floating drum has a plurality of ballast tanks in (15), injects ballast water floating drum (15) is sunk, and injecting gas, discharges ballast water and can make floating drum (15) floating; It is characterized in that: concrete installation method comprises the following steps:
A, preparation work
Floating drum (15) is when shipyard is built, towing system, chain cable compressor (26) and anchor chain pulley (27) are installed in advance on floating drum (15), each anchor leg point of connection at floating drum (15) is installed two floating drum pre-installation chain segment, is used for next and being connected of ballasting system; Floating drum (15) is carried out the part ballast, check, rinse ballast line and gas injection pipeline; With towboat (14), floating drum (15) is towed to the target marine site; All repair ship is in place;
B, anchoring system are installed
B1, by two repair ship cooperations operation of casting anchor, a repair ship is transferred to deep-seaanchor (2) marine, deep-seaanchor (2) opposite side connects and mixes the anchor leg, described mixing anchor leg is by bottom chain section (5), anchor hawser (6) and part top chain section form, transfer the anchor leg by another repair ship when transferring deep-seaanchor (2), part top chain section end and auxiliary buoy (4), interim rope is connected by transom (9), auxiliary buoy (4) below is latch closure (10), be used for being connected cooperation with suspension hook (13), chain segment is connected to repair ship by the operation hawser,
B2, carry out routine work deep-seaanchor is arranged on seabed, anchor hawser (6) tensioning under auxiliary buoy (4) buoyancy, repair ship tensioning operation hawser makes anchor hawser (6) have certain inclination angle in water;
B3, according to the actual requirement of floating drum (15) anchoring, by the method for step B1, B2, all anchoring systems are installed;
In place and the sinking of C, floating drum (15)
C1, use towboat (14) tow to attachment point with floating drum (15);
C2, the auxiliary connection of completing ballasting system of repair ship of use, described ballasting system comprises kentledge (16), the chain segment that is connected with kentledge (16), rope and operation hawser temporarily, another part top chain Duan Xianyu floating drum (15) pre-installation chain segment is connected, connect interim rope, chain segment, kentledge (16) and operation hawser on repair ship, the operation hawser extends to repair ship again; Interim rope is connected by transom (9) with the part top chain section of floating drum (15); Transom (9) the below suspension hook (13) that dangles, be used for being connected with auxiliary buoy (4) below latch closure (10);
Return to the beginning of step C2, the connection of all ballasting systems that used the same method and release;
C3, to water filling in ballast tank, under the effect of kentledge (16) and part top chain section, the stable sinking of floating drum (15), by regulating the length of operation hawser, and the distance of repair ship and floating drum (15), can the ballast power of regulating action on floating drum (15), in the repair ship moving process, keep under water the position of auxiliary buoy (4) and the inclination angle of anchor hawser (6); For all working ship, the adjusting of operation cable length, the control of repair ship and floating drum (15) distance is carried out simultaneously;
D, anchoring system are connected with floating drum (15)
D1, floating drum (15) sink down into auxiliary buoy (4) top certain altitude, use ROV(24) carry out being connected of suspension hook (13) and latch closure (10), connect complete, the interim rope that disconnection is connected with the anchor leg; Carry out being connected of all anchoring systems and floating drum (15) by step D1;
D2, discharge the water in ballast tank, all ballasting systems carried out folding and unfolding and adjusting simultaneously, under ballasting system is controlled, make the stable floating of floating drum (15) until ROV(24 is used in all anchor leg tensionings) disconnect the interim rope of all ballasting systems; So far, complete the preliminary installation of floating drum (15);
The adjusting of E, anchor leg length
After the measurement installation, the inclination angle of floating drum (15),, if do not meet engineering discipline, need to regulate the anchor leg length;
E1, ballasting system is connected with another root chain segment of floating drum (15) pre-installation, all ballasting systems carry out same connection;
Distance between E2, adjusting repair ship and floating drum (15) and the length of operation hawser, re-start ballast to floating drum (15), and all working ship carries out synchronous operation;
E3, operation hawser are connected with floating drum pre-installation chain segment upper end, use ROV(24), open chain cable compressor (26), extract the anchor chain of design length out, close chain cable compressor (26), clamp anchor chain;
E4, if necessary, regulate the length of other anchor legs according to step e 1-E3;
E5, cut off the interim rope of all ballasting systems.
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| CN104097748A (en) * | 2014-07-01 | 2014-10-15 | 中交一航局第一工程有限公司 | Parking craning method for vibration sinking construction of steel cylinders |
| CN104638574A (en) * | 2015-01-26 | 2015-05-20 | 中船重工（武汉）船舶与海洋工程装备设计有限公司 | Cable layout device |
| CN104724553A (en) * | 2015-01-26 | 2015-06-24 | 中船重工（武汉）船舶与海洋工程装备设计有限公司 | Device and method for laying and recycling cables |
| CN104986292A (en) * | 2015-08-12 | 2015-10-21 | 江苏亚星锚链股份有限公司 | Lifting hook for oil platform mooring |
| CN105366005A (en) * | 2015-11-25 | 2016-03-02 | 深圳海油工程水下技术有限公司 | Mooring anchor leg replacement method |
| CN105366005B (en) * | 2015-11-25 | 2017-06-16 | 深圳海油工程水下技术有限公司 | A kind of replacing options of mooring anchor leg |
| CN105691559A (en) * | 2016-01-31 | 2016-06-22 | 大连理工大学 | Double-cylinder and plate combined type ocean experimental platform and collecting and deploying method thereof |
| CN105775078B (en) * | 2016-03-08 | 2019-01-01 | 中国石油大学(华东) | Aqueous vapor displacement type underwater equipment auxiliary installation device and installation method |
| CN105775078A (en) * | 2016-03-08 | 2016-07-20 | 中国石油大学(华东) | Water-gas replacement type underwater equipment auxiliary installation device and method |
| CN106335608A (en) * | 2016-09-23 | 2017-01-18 | 中交第三航务工程局有限公司宁波分公司 | Mounting method of seabed anchor |
| CN106522896A (en) * | 2016-12-02 | 2017-03-22 | 大连理工大学 | Double-layer underwater production supporting floating barrel and installation and recycling methods thereof |
| CN106522896B (en) * | 2016-12-02 | 2019-01-11 | 大连理工大学 | Production support floating drum and its installation and recovery method under a kind of Double-layer water |
| CN110520352A (en) * | 2017-02-01 | 2019-11-29 | 斯卡特里公司 | System for fixing immersion floating drum |
| CN110520352B (en) * | 2017-02-01 | 2021-12-10 | 斯卡特里公司 | System for fixing a submerged buoy |
| CN110789669A (en) * | 2019-01-28 | 2020-02-14 | 深圳海油工程水下技术有限公司 | System and method for recycling and putting down reclaimed water buoy in deep water single-point mooring |
| CN110789669B (en) * | 2019-01-28 | 2020-12-08 | 深圳海油工程水下技术有限公司 | System and method for recycling and putting down reclaimed water buoy in deep water single-point mooring |
| CN110274658A (en) * | 2019-07-29 | 2019-09-24 | 中国电建集团中南勘测设计研究院有限公司 | A kind of hydroenergy storage station ice condition supervising device and method |
| CN114108637A (en) * | 2021-11-05 | 2022-03-01 | 中国一冶集团有限公司 | Positioning construction method for underwater film bag |
| CN114108637B (en) * | 2021-11-05 | 2024-04-02 | 中国一冶集团有限公司 | Positioning construction method for underwater film bag |
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