CN115246467B - Main engine installation method of stern half ship - Google Patents
Main engine installation method of stern half ship Download PDFInfo
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- CN115246467B CN115246467B CN202210929527.7A CN202210929527A CN115246467B CN 115246467 B CN115246467 B CN 115246467B CN 202210929527 A CN202210929527 A CN 202210929527A CN 115246467 B CN115246467 B CN 115246467B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000009434 installation Methods 0.000 title abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 238000012795 verification Methods 0.000 claims abstract description 18
- 238000005553 drilling Methods 0.000 claims abstract description 14
- 239000003550 marker Substances 0.000 claims description 54
- 238000005266 casting Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 7
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
- B63B73/20—Building or assembling prefabricated vessel modules or parts other than hull blocks, e.g. engine rooms, rudders, propellers, superstructures, berths, holds or tanks
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- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention relates to the technical field of ship construction and discloses a main engine installation method of a stern half ship, which comprises the following steps of S1, carrying out shafting stay wire verification on the stern half ship, and marking the shafting center line of the stern half ship; s2, determining a central line and a height line of a main machine of the main machine base, scribing and drilling anchor bolts; s3, floating and sitting piers of the stern half-ship, and correcting the center line of the ship body and the center line of the shafting; s4, hoisting the host; and S5, after the tail part of the stern half ship is welded, performing a fine-pulling line test operation of the rudder system. Before a half stern ship floats and sits on a pier, a central line and a height line of a host machine are determined by the central line of a shaft system, the operations such as pulling grinding, coating, pre-outfitting and the like can be carried out on the host machine after drilling is completed, the outfitting procedure is moved forward, the integrity of the cabin outfitting of the half stern ship is improved, after the half stern ship floats and sits on the pier, the host machine and the upper building hoisting are synchronously carried out, the passive situation that the host machine can be hoisted after the original shaft rudder system is precisely pulled is changed, the shaft system installation period is shortened, and the undocking integrity is greatly improved.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to a main engine installation method of a stern half ship.
Background
In order to reasonably utilize dock resources, a ship building company plans a serial building mode of a whole ship and a half stern ship in the ship building process, namely, when the whole ship is built in a dock, half ships are built in the dock at the same time by utilizing the vacant space of the length of the dock, after the whole ship is built, the half stern ship is moved forward to sit on a pier after the whole ship is out of the dock, the ship is continuously built at a new position in the dock, and finally, the whole ship is out of the dock after the whole ship is formed, so that the dock resources are fully utilized, and the ship building efficiency is improved.
In ship construction, shafting rudder system positioning and host installation are important rings in the construction process, and the installation accuracy of the shafting rudder system is directly related to the reliability of a ship propulsion system and the safety of ship navigation. According to the traditional building mode, the conventional process flow is shown as the figure, the rudder system block carrying and positioning can be performed only after the whole ship is undocked and the half ship floats and sits on the pier, the fine stay wire is performed after the rudder system stay wire state is reached, the main engine base is drilled according to the positioning result of the fine stay wire, and the main engine hoisting operation is performed according to the drilling position.
Each procedure of the conventional process flow is mutually restricted and the procedures are mutually buckled, the operation can be performed after the floating and pier-sitting operation of the stern half-ship is completed, but the carrying period before the floating and pier-sitting operation of the stern half-ship is longer, if the shaft hole wire-drawing drilling can be performed before the floating of the stern half-ship, the cabin integrity before the floating can be improved, and the host installation period after the floating can be shortened.
Disclosure of Invention
The purpose of the invention is that: the host installation method of the stern half ship is provided, so that the integrity of a cabin before floating is improved, and the host installation period after floating is shortened.
In order to achieve the above purpose, the invention provides a method for installing a main engine of a stern half-ship, comprising the following steps of S1, molding the stern half-ship, carrying out shafting stay wire test on the stern half-ship, and marking the shafting center line of the stern half-ship according to shafting stay wire test results; step S2, determining a main machine center line and an altitude line of the main machine base according to the shafting center line in the step S1, thereby determining an anchor bolt datum line of the main machine base, and carrying out anchor bolt scribing and drilling; s3, floating and sitting piers of the stern half-ship, retesting the hull central line deviation and the shafting central line deviation of the stern half-ship, correcting the hull central line and the shafting central line by taking the main engine central line as a reference, and taking the corrected hull central line and shafting central line as positioning references carried by sections; s4, hoisting the host machine by taking the central line of the host machine in the step S3 as a reference, and installing the host machine on the bolt hole drilled in the step S2; and S5, after the tail part of the stern half ship is welded, performing a fine-pulling line test operation of the rudder system.
Preferably, in step S1, a front marker post is set up on the front side of the front base panel of the main base groove, a middle marker post is set up on the rear side of the rear base panel of the main base groove, a rear marker post is set up on the front side of the front end face of the stern shaft casting of the stern half-ship, and center line marks are made on the front marker post, the middle marker post and the rear marker post when the shafting is pulled.
Preferably, in step S1, the front, middle and rear targets all adopt a "gate" shape structure.
Preferably, in the step S1, the distance between the front marker post and the front base panel is 50-200mm, the distance between the middle marker post and the rear base panel is 100-400mm, and the distance between the rear marker post and the front end surface of the stern shaft casting is 1000-3000mm.
Preferably, in step S1, according to the theoretical height of the ship shafting, a laser instrument is erected on the laser operation platform, the laser is adjusted to the axis position by aiming at the center ground sample steel block of the dock, shafting stay wire verification is performed, and center line marks are made on the front marker post, the middle marker post and the rear marker post after the verification.
Preferably, in step S2, after the anchor bolts are scribed and drilled, the tail shaft and the intermediate shaft of the shafting are advanced into the cabin and placed in place, and the tail shaft and the intermediate shaft are wrapped and protected.
Preferably, the intermediate shaft is placed on the bilge of the ship body, and the tail shaft is hoisted in the bilge in a hoisting manner.
Preferably, in step S3, when the stern half-ship floats and sits on the pier, the bottom area of the cabin adopts rigid support piers.
Preferably, in step S4, a laser instrument is erected with the shafting center line as a reference to simulate an axis, and after the axis is rotated by 90 degrees, a rudder line is simulated to perform rudder system total section positioning.
Preferably, in step S1, the requirements for shafting wire verification are: the front wall of the cabin is welded by a main body structure below the tail and the upper deck, the cargo hold is welded in sections without the requirement of test, and besides the cooling water cabin, the cabin tightness test below the rear double-layer bottom of the front wall of the cabin is finished, and the outer brackets at the bottom of the cabin are completely dismantled.
Compared with the prior art, the host installation method of the stern half ship has the beneficial effects that: before a half stern ship floats and sits on a pier, shafting stay wire is firstly checked on the half stern ship, the central line and the height line of a host machine are determined by the central line of the shafting, the datum line of an anchor bolt is determined, drilling is carried out, the host machine can be subjected to operations such as pulling grinding, coating, pre-outfitting and the like after drilling is completed, the outfitting procedure is advanced, the integrity of cabin outfitting of the half stern ship is improved, after the pier is floated and sits on the pier, the shafting precision is used as a reference to match the rudder system precision, the hull central line deviation and the shafting central line deviation of the half stern ship are retested, the host machine hoisting can be carried out, the host machine hoisting can be synchronously carried out with the building hoisting, the passive situation that the host machine can be hoisted after the original shafting rudder system finish stay wire is changed, the shafting installation period is shortened, and the integrity of the ship is greatly improved.
Drawings
FIG. 1 is a flow chart of a prior art method of installing a host of a stern half-boat;
FIG. 2 is a flow chart of the host installation method of the stern half-boat of the present invention;
FIG. 3 is a schematic diagram of shafting stay wire verification of the main engine installation method of the stern half-ship of the present invention;
FIG. 4 is a schematic diagram of a front marker post of the stern half-ship of the present invention when the main machine installation method of the stern half-ship performs shafting stay verification;
FIG. 5 is a schematic diagram of a middle post of the stern half-ship of the present invention when the main machine installation method of the stern half-ship performs shafting pull test;
FIG. 6 is a schematic diagram of a rear marker post of the stern half-ship of the present invention when the main machine installation method of the stern half-ship performs shafting stay verification;
fig. 7 is a schematic view showing a state in which the intermediate shaft and the tail shaft are put into the cabin in the main frame installation method of the stern half-ship of the present invention.
In the figure, 1, a front marker post; 2. a middle mark post; 3. a rear post; 4. a center ground sample steel block; 5. an intermediate shaft; 6. a tail shaft; 7. and (5) a laser instrument.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The preferred embodiment of the host installation method of the stern half-ship of the invention is shown in fig. 2 to 7, and the host installation method of the stern half-ship comprises the following steps of S1, molding the stern half-ship, carrying out shafting stay test on the stern half-ship, and marking the shafting center line of the stern half-ship according to shafting stay test results; step S2, determining a main machine center line and an altitude line of the main machine base according to the shafting center line in the step S1, thereby determining an anchor bolt datum line of the main machine base, and carrying out anchor bolt scribing and drilling; s3, floating and sitting piers of the stern half-ship, retesting the hull central line deviation and the shafting central line deviation of the stern half-ship, correcting the hull central line and the shafting central line by taking the main engine central line as a reference, and taking the corrected hull central line and shafting central line as positioning references carried by sections; s4, hoisting the host machine by taking the central line of the host machine in the step S3 as a reference, and installing the host machine on the bolt hole drilled in the step S2; and S5, after the tail part of the stern half ship is welded, performing a fine-pulling line test operation of the rudder system.
In the step S1, when the shafting stay wire test is carried out, the half stern ship is manufactured and formed but does not float and move to sit the pier, the shafting stay wire test is carried out before the half stern ship floats, the drilling is carried out before the footing bolt of the main machine is lifted, the operations such as pulling grinding, coating, pre-outfitting and the like can be carried out on the main machine after the drilling is completed, the outfitting procedure is moved forward, and the outfitting integrity of the half stern ship cabin is improved.
In step S2, the installation accuracy between the shafting and the host computer is related to the reliability of the ship propulsion system, and the center line and the height line of the host computer are determined by taking the center line of the shafting obtained in the shafting pulling test as a reference, so that the host computer and the shafting are in the same straight line, and the positioning accuracy of the foundation bolt hole of the host computer is ensured.
In step S3, when the stern half-ship floats and sits on the pier, the ship body center line and the shafting center line are influenced by structural deformation during sitting on the pier, deviation can occur on the ship body center line and the shafting center line, the ship body center line, the shafting center line and the shafting center line are corrected by taking the main engine center line as a reference, and the precision of subsequent sectional construction and carrying and the precision of shafting installation can be improved.
The reference deviation between the corrected reference line and the centerline of the hull before the floating pier is as follows: the left and right are smaller than 2mm, the up and down are smaller than 5mm, and meanwhile, the left and right deviation between the center line of the shafting and the theoretical center line is smaller than or equal to 4mm.
In step S4, when the host is hoisted, the host and the built-up structure of the ship body can be hoisted simultaneously, the passive situation that the host can be hoisted after the original rudder system is finish-pulled can be changed, the shafting installation period is shortened, and the undocking integrity is greatly improved.
In step S5, after the tail section of the stern half ship is welded in a subsection manner, the shaft rudder system fine pulling line verification operation is carried out, and the shaft rudder system fine pulling line procedure is put at the end, so that the procedures of shaft system pulling line verification, host anchor bolt drilling, host hoisting operation and the like can be advanced, the passive situation that the host can be hoisted after the original shaft rudder system pulling line is changed, and the ship construction efficiency is improved.
After the tail of the stern half ship meets the requirement of finish-pulling line, a laser instrument 7 is erected on a laser platform, a point is marked on the front central line of the floating back ship, a final axis is determined, and laser is rotated by 90 degrees to measure rudder system data and draw a checking circle.
Preferably, in step S1, a front marker post 1 is set up on the front side of the front base panel of the main base groove, a middle marker post 2 is set up on the rear side of the rear base panel of the main base groove, a rear marker post 3 is set up on the front side of the front end face of the stern shaft casting of the stern half-ship, and center line marks are made on the front marker post 1, the middle marker post 2 and the rear marker post 3 when the shafting is pulled.
Center line marks are made on the front marker post 1, the middle marker post 2 and the rear marker post 3, the center line of the shaft system can be retested by taking the center line marks as a reference, the center line deviation of the shaft system is determined, and the subsequent installation of the intermediate shaft 5 and the tail shaft 6 is facilitated.
In the embodiment, the stem direction is taken as the front direction and the stern direction is taken as the rear direction, the front marker post 1 is arranged on the front side of the front base panel of the main base groove, the middle marker post 2 is arranged on the rear side of the rear base panel of the main base groove, the rear marker post 3 is arranged on the front side of the front end face of the stern shaft casting of the stern half ship, the shafting center line is determined by the three, and the three-point one-line has a verification effect.
Preferably, in step S1, the front pole 1, the middle pole 2 and the rear pole 3 all adopt a "door" shape structure.
Because the main engine base footing bolt drills the hole in advance, the main engine is hoisted before final stay wire, so that the intermediate shaft 5 and the tail shaft 6 need to enter the cabin in advance, and the front marker post 1, the middle marker post 2 and the rear marker post 3 all adopt a 'door' -shaped structure, so that the intermediate shaft 5 can be prevented from being collided with the marker post.
Preferably, in the step S1, the distance between the front marker post 1 and the front base panel is 50-200mm, the distance between the middle marker post 2 and the rear base panel is 100-400mm, and the distance between the rear marker post 3 and the front end surface of the stern shaft casting is 1000-3000mm.
When the center line is retested and the rudder system block is positioned later, the center line mark on the marker post is used as a reference for positioning, and the center line and the rudder system block are convenient to position later under the distance.
In this embodiment, the distance between the front post 1 and the front base plate is preferably 100mm, the distance between the middle post 2 and the rear base plate is preferably 300mm, and the distance between the rear post 3 and the front end surface of the stern shaft casting is preferably 2000mm.
Preferably, in step S1, according to the theoretical height of the ship shafting, a laser instrument 7 is erected on the laser operation platform, the laser is adjusted to the axis position aiming at the center ground sample steel block 4 of the dock, shafting stay wire verification is performed, and center line marks are made on the front marker post 1, the middle marker post 2 and the rear marker post 3 after verification.
The theoretical height of the ship shafting is taken as a reference to erect the laser instrument 7, and shafting wire drawing operation is performed by aiming at the central ground sample steel block 4, so that the test accuracy can be improved. When the center line mark is made, the height reference lines are synchronously marked on the front marker post 1 and the rear marker post 3, cross marks are made on the front end face and the rear end face of the stern shaft casting, the inspection circle is drawn, the inspection circle of the rear end face is used for the test, and the inspection circle of the front end face is used for the reference; and (5) carrying out relevant alignment scribing on the foundation bolts of the main frame.
Preferably, in step S2, after the anchor bolts are scribed and drilled, the tail shaft 6 and the intermediate shaft 5 of the shafting are put into the cabin in advance and put in place, and the tail shaft 6 and the intermediate shaft 5 are wrapped and protected.
The main engine shaft rod is inserted into the tail shaft hole from the inside of the engine room, and the main engine is hoisted in place before the main engine is pulled, so that the space of the engine room is narrow, the tail shaft 6 rod is blocked to enter the engine room for installation, and the intermediate shaft 5 and the tail shaft 6 are required to enter the engine room in advance before the main engine is hoisted.
In the embodiment, the intermediate shaft 5 and the tail shaft 6 are wrapped by three-proofing cloth, so that the shaft rod is prevented from being damaged and scrapped due to collision with the shaft rod in the construction process.
Preferably, the intermediate shaft 5 is placed on the bilge of the ship body, and the tail shaft 6 is hoisted in the bilge in a hoisting manner.
The placement requirements of the intermediate shaft 5 and the tail shaft 6 are as follows: the laser measurement of the post shafting finish-pulling line cannot be blocked, and meanwhile, the laser measurement cannot collide with the established reference standard pole. The intermediate shaft 5 is placed on the ground, and the tail shaft 6 is suspended in the air by adopting three points, so that the placing requirement can be met.
Preferably, in step S3, when the stern half-ship floats and sits on the pier, the bottom area of the cabin adopts rigid support piers.
Because the main engine foundation bolts before the floating and sitting piers of the stern half-ship are drilled, the rigid support piers are implemented in the bottom area of the engine room, and the precision change of the floating and sitting piers can be reduced.
Preferably, in step S4, the laser instrument 7 is erected with the shafting center line as a reference to simulate an axis, and after the axis is rotated by 90 degrees, a rudder line is simulated to perform rudder system total section positioning.
The rudder system total section positioning can be performed before the main machine hoisting or after the main machine hoisting. When the rudder system total section is positioned before the host is hoisted, the laser instrument 7 is adjusted by taking the central line and the height line of the front marker post 1 as the reference, and the rudder system total section is adjusted and positioned by rotating by 90 degrees as the theoretical reference of the rudder system; when the rudder system total section is positioned after the host is lifted, the laser instrument 7 is adjusted by taking the central line and the height line of the post marker post 3 as the reference, and the rudder system total section is adjusted and positioned by rotating 90 degrees as the theoretical reference of the rudder system.
Preferably, in step S1, the requirements for shafting wire verification are: the front wall of the cabin is welded by a main body structure below the tail and the upper deck, the cargo hold is welded in sections without the requirement of test, and besides the cooling water cabin, the cabin tightness test below the rear double-layer bottom of the front wall of the cabin is finished, and the outer brackets at the bottom of the cabin are completely dismantled.
In summary, the embodiment of the invention provides a host installation method of a stern half-ship, which comprises the steps of firstly carrying out shafting stay wire test on the stern half-ship before the stern half-ship floats and sits on a pier, determining the central line and the height line of the host by using the central line of the shafting, determining the datum line of an anchor bolt and drilling, carrying out operations such as pulling grinding, coating, pre-outfitting and the like on the host after the drilling is completed, advancing the outfitting process, improving the integrity of the cabin outfitting of the stern half-ship, matching the shafting precision by taking the shafting precision as a reference after floating sitting on the pier, carrying out host hoisting by taking the hull central line deviation and shafting central line deviation of the stern half-ship as the reference, carrying out host hoisting synchronously with the up-building hoisting, and changing the passive situation that the host can be hoisted after the original shafting rudder system is precisely pulled, shortening the shafting installation period and greatly improving the docking integrity.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (8)
1. The method for installing the host of the stern half ship is characterized by comprising the following steps of S1, molding the stern half ship, carrying out shafting stay wire verification on the stern half ship, and marking the shafting center line of the stern half ship according to shafting stay wire verification results; step S2, determining a main machine center line and an altitude line of the main machine base according to the shafting center line in the step S1, thereby determining an anchor bolt datum line of the main machine base, and carrying out anchor bolt scribing and drilling; s3, floating and sitting piers of the stern half-ship, retesting the hull central line deviation and the shafting central line deviation of the stern half-ship, correcting the hull central line and the shafting central line by taking the main engine central line as a reference, and taking the corrected hull central line and shafting central line as positioning references carried by sections; s4, hoisting the host machine by taking the central line of the host machine in the step S3 as a reference, and installing the host machine on the bolt hole drilled in the step S2; s5, after the tail part of the stern half ship is welded, performing a shaft rudder system finish-drawing line verification operation;
in the step S1, a front marker post is arranged on the front side of a front base panel of a main base groove, a middle marker post is arranged on the rear side of a rear base panel of the main base groove, a rear marker post is arranged on the front side of the front end surface of a stern shaft casting of a stern half-ship, and center line marks are made on the front marker post, the middle marker post and the rear marker post when a shafting is pulled;
in step S1, a laser instrument is erected on a laser operation platform according to the theoretical height of a ship body shafting, laser is adjusted to the axis position aiming at a center ground sample steel block of a dock, shafting stay wire verification is carried out, and center line marks are made on a front marker post, a middle marker post and a rear marker post after the verification.
2. The method for installing a main frame of a stern half-ship according to claim 1, wherein in the step S1, the front marker post, the middle marker post and the rear marker post each have a "gate" shape.
3. The method for installing a main frame of a stern half-ship according to claim 1, wherein in the step S1, the distance between the front post and the front base plate is 50-200mm, the distance between the middle post and the rear base plate is 100-400mm, and the distance between the rear post and the front end face of the stern shaft casting is 1000-3000mm.
4. A method of installing a main engine of a stern semi-vessel as claimed in any one of claims 1 to 3, wherein in step S2, after the anchor bolts are drilled by scribing, the tail shaft and the intermediate shaft of the shafting are advanced into the cabin and put in place, and the tail shaft and the intermediate shaft are wrapped and protected.
5. The method for installing a main engine of a stern semi-ship as set forth in claim 4, wherein the intermediate shaft is placed on the bilge of the ship body, and the stern shaft is hoisted in the bilge by hoisting.
6. A method of installing a main engine of a stern half-ship as claimed in any one of claims 1 to 3, wherein in step S3, the bottom region of the nacelle is rigidly supported by the pier as the stern half-ship floats and sits on the pier.
7. A method for installing a main engine of a stern semi-ship according to any one of claims 1 to 3, wherein in step S4, a laser instrument is erected based on the axis center line to simulate an axis, and the axis is rotated by 90 degrees to simulate a rudder line, thereby performing rudder system block positioning.
8. A method for installing a main engine of a stern semi-ship according to any one of claims 1 to 3, wherein in step S1, the shafting stay wire report requires: the front wall of the cabin is welded by a main body structure below the tail and the upper deck, the cargo hold is welded in sections without the requirement of test, and besides the cooling water cabin, the cabin tightness test below the rear double-layer bottom of the front wall of the cabin is finished, and the outer brackets at the bottom of the cabin are completely dismantled.
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| CN202210929527.7A CN115246467B (en) | 2022-08-03 | 2022-08-03 | Main engine installation method of stern half ship |
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| RU2013284C1 (en) * | 1990-11-26 | 1994-05-30 | Львовский политехнический институт | Method of regulation of position of sternpost being mounted |
| KR20070111776A (en) * | 2006-05-19 | 2007-11-22 | 대우조선해양 주식회사 | Final sighting |
| CN102849179A (en) * | 2012-01-16 | 2013-01-02 | 浙江东海岸船业有限公司 | 5,000PCTC (pure car and truck carrier) shafting irradiation process |
| CN102745308A (en) * | 2012-06-21 | 2012-10-24 | 上海江南长兴重工有限责任公司 | Method for carrying bulk freighter body stern part assembly |
| CN104743060A (en) * | 2015-04-27 | 2015-07-01 | 上海外高桥造船海洋工程有限公司 | Ship main engine installation method |
| CN110789682A (en) * | 2019-11-14 | 2020-02-14 | 武昌船舶重工集团有限公司 | Method for positioning central line of propulsion shaft system |
| CN110789686A (en) * | 2019-11-29 | 2020-02-14 | 江南造船(集团)有限责任公司 | Ship shafting installation method |
| CN111746751A (en) * | 2020-06-29 | 2020-10-09 | 沪东中华造船(集团)有限公司 | High-precision installation method for marine main engine |
| CN114701619A (en) * | 2022-03-10 | 2022-07-05 | 江南造船(集团)有限责任公司 | Main engine positioning and mounting method based on block construction |
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