CN113060254A - Method for installing telescopic propulsion device of deep water dynamic positioning crude oil transport ship - Google Patents
Method for installing telescopic propulsion device of deep water dynamic positioning crude oil transport ship Download PDFInfo
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- CN113060254A CN113060254A CN202110227467.XA CN202110227467A CN113060254A CN 113060254 A CN113060254 A CN 113060254A CN 202110227467 A CN202110227467 A CN 202110227467A CN 113060254 A CN113060254 A CN 113060254A
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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
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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
- B63B71/00—Designing vessels; Predicting their performance
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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
- B63B73/60—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by the use of specific tools or equipment; characterised by automation, e.g. use of robots
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Abstract
The invention discloses a method for installing a telescopic propulsion device of a deepwater dynamically positioned crude oil carrier, which comprises the following steps: step 1, preparation work before installation; step 2, hoisting the propeller into the propeller by using a crane; step 3, positioning and welding a propeller mounting platform; step 4, mounting a lower guide rod assembly; step 5, installing a guide rod assembly; step 6, installing a hydraulic unit; step 7, performing telescopic test; step 8, installing a main motor; step 9, temporarily attaching the bottom plate to a rib plate of the air guide sleeve; step 10, mounting a hinged bolt of an upper guide plate seat; step 11, mounting a locking device; step 12, installing an air panel of a locking device; step 13, mounting a bottom plate; and 14, reporting and connecting the remaining oil pipes, injecting oil, and connecting cables to complete the installation of the telescopic propulsion device. By adopting the installation method, the installation working efficiency is greatly improved, and the installation error rate and damage rate are reduced.
Description
Technical Field
The invention relates to the field of construction and assembly of deep-water dynamically positioned crude oil delivery ships, in particular to a method for installing a telescopic propulsion device of a deep-water dynamically positioned crude oil delivery ship.
Background
The existing installation method of the telescopic propulsion device of the deep water power positioning crude oil carrier has the following defects: firstly, because large-scale equipment is adopted, the size and the weight are large, and easily damaged parts such as a display instrument, a relay and a sensor are inevitably collided or scraped and damaged in the hoisting process, so that the preparation work before the installation is not emphasized, the subsequent installation progress is influenced, and the normal work of the equipment after the installation is influenced; secondly, because the installation process is not reasonable, the installation work efficiency is not high.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a method for installing a telescopic propulsion device of a deep-water dynamic positioning crude oil carrier with high installation efficiency.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the installation method of the telescopic propulsion device of the deepwater dynamic positioning crude oil transport ship comprises the following steps:
step 5, installing a guide rod assembly;
step 6, installing a hydraulic unit;
step 7, performing telescopic test;
step 12, installing an air panel of the locking device: installing an air panel of the locking device on the ship body, connecting a compressed air pipe, and rechecking whether the locking device works normally without interference;
step 13, installing a bottom plate: adjusting a bottom plate of the propeller, lifting the propeller to a retracted position, adjusting the position of the bottom plate according to installation requirements, and installing the bottom plate on the propeller;
and 14, reporting and connecting the remaining oil pipes, injecting oil, and connecting cables to complete the installation of the telescopic propulsion device.
Further, in the step 2, hoisting the propeller into the propeller by using a crane specifically includes the following steps: 2.1, the propeller is positioned on the transportation frame, and the crane is connected with the lifting lug on the transportation frame and the lifting lug on the propeller; 2.2, hoisting and turning over the propeller to a vertical position by the crane; step 2.3, the lower guide plate is arranged below the propeller and tied to a lifting lug of the propeller through a rope; and 2.4, slowly hanging the propeller downwards into the surrounding well of the mounting section of the propeller device from the upper part.
Further, in step 3, the positioning and welding of the propeller mounting platform specifically includes the following steps: step 3.1, eight central positioning points (visible in a position of a mark) are arranged on the propeller mounting platform and can be used for positioning; step 3.2, checking through an observation port on the steering gear box, and confirming that the rudder angle is at the position of 0 degree before the platform is positioned and adjusted; 3.3, after the thruster is located on the deck, the allowable error of front, back, left and right is +/-2 mm, and data is recorded, and the levelness of the platform is adjusted by a level meter in the period, wherein the error of the levelness is +/-2 mm; step 3.4, after the adjustment is finished, before the platform is welded, whether the installation position is consistent with a drawing is confirmed again, and a gap between the air guide sleeve and the opening of the ship body is checked by using a vertical line, wherein the gap is not less than 50 mm; step 3.5, welding the propeller mounting platform to the ship body, monitoring deformation conditions in time in the welding process and adjusting the welding sequence; and 3.6, after welding, carrying out flaw detection on the welding seam and reporting the flaw detection.
Further, in the step 4, the step of installing the lower guide rod assembly specifically includes the following steps: step 4.1, mounting the right lower guide plate on the lower guide rod, and pre-connecting and fixing the right lower guide plate seat on the right lower guide plate by using a bolt; step 4.2, mounting the left lower guide plate on the lower guide rod, and pre-connecting and fixing the left lower guide plate seat on the left lower guide plate by using bolts; step 4.3, fixing the left lower guide plate and the right lower guide plate with the left lower guide plate seat and the right lower guide plate seat respectively through spot welding by using a welding machine; 4.4, adjusting the left lower guide plate seat and the right lower guide plate seat, and welding the left lower guide plate seat and the right lower guide plate seat to the ship body after the adjustment is finished; and 4.5, reaming the holes and mounting the hinged bolts.
Further, in step 5, before the upper guide rod assembly is installed, the temporary upper guide rod is removed, and then the formal upper guide rod assembly is installed, wherein the upper guide rod assembly comprises an upper guide rod, an upper guide plate and an upper guide plate seat, the upper guide plate in the upper guide rod assembly is fixed on the upper guide plate seat through bolts, the upper guide plate seat is divided into two halves, one half is welded with the hull, and the other half is welded with the upper guide rod in the upper guide rod assembly.
Further, in step 6, installing a hydraulic unit specifically includes the following steps: step 6.1, 5% of antirust oil is filled in the hydraulic unit, and the antirust oil in the oil tank is discharged before oil is injected; step 6.2, connecting the A1 pipeline, the A2 pipeline and the B1 pipeline on the propeller mounting platform with a hydraulic unit; 6.3, installing a hydraulic unit and a temporary pipeline for connecting the hydraulic unit and the telescopic hydraulic cylinder; step 6.4, injecting about 250 to 300L of hydraulic oil when the propeller is at the extending position; 6.5, blowing the equipment pipeline and the hydraulic cylinder by using a blowing tool; and 6.6, filling the energy accumulator with N2 gas, wherein the pressure of the N2 gas is 14.7MPa, and carrying out 2000cm high-capacity labor intensity distribution.
Further, in step 7, the telescoping test specifically includes the following steps: step 7.1, tying one end of a safety rope on the suspender, connecting the other end of the safety rope with the propeller, wherein the safety rope is not stressed under the non-emergency condition; and 7.2, retracting the propeller by using a hydraulic system to ensure that the propeller can be smoothly lifted.
Further, in the step 8, installing the main motor specifically includes the following steps: step 8.1, cleaning the base surface of the motor before installation, and respectively installing the two half parts of the coupling on the main motor and the propeller; 8.2, removing the cover of the propeller coupling and hoisting the main motor; 8.3, centering the motor and the propeller by using a dial indicator; 8.4, screwing the bolt and the gasket on the motor base, and confirming centering again; step 8.5, mounting components on the coupling and screwing bolts on the coupling; step 8.6, grease is injected into the coupling; and 8.7, installing a positioning pin on the motor base.
Further, in step 11, the step of installing the locking device specifically includes the following steps: step 11.1, adjusting a safety valve of the hydraulic unit to 8MPa, and gradually increasing a set value; step 11.2, slowly lifting the thruster and keeping the thruster at the retraction position; step 11.3, hoisting the locking device by using a hoist (about 1.5 tons); and 11.4, adjusting the locking device and welding the seat plate of the locking device to the ship body.
The invention has the beneficial effects that:
by adopting the installation method, the installation working efficiency is greatly improved, and the installation error rate and damage rate are reduced. The preparation work before the installation of the invention is beneficial to the smooth expansion and the continuous operation of the next procedure, in the installation work of the prior art, easily damaged parts such as display instruments, relays, sensors and the like are easy to collide or scrape and are damaged, and the protection device is required to be detached or installed before the hoisting, thereby greatly reducing the damage rate of the equipment. The exposed hole cover needs to be bound so as to prevent foreign matters from entering the hole cover and ensure that the equipment can work normally. The technical characteristics of the step 2 of the invention emphasize the hoisting point, the guide rod and the hydraulic cylinder are often used as the hoisting point of the propeller in the prior art, and the guide rod and the hydraulic cylinder are easily damaged in hoisting; the lower guide plate is arranged after the propeller is hoisted at the installation site, and the lower guide plate is arranged again for protecting the lower guide plate. The technical characteristics in step 7 of the present invention are two points: firstly, a safety rope is added during the telescopic test, and when the test is unsuccessful and an emergency occurs, the safety rope can limit and protect the propeller; and secondly, the front and back sequence of the telescopic test is changed, the telescopic test is started after the hydraulic unit is installed, the fault can be conveniently eliminated, the maintenance and overhaul of the equipment are facilitated, and the installation efficiency is improved.
Drawings
The invention is further described with the aid of the accompanying drawings, in which the embodiments do not constitute any limitation, and for a person skilled in the art, without inventive effort, further drawings may be obtained from the following figures:
FIG. 1 is an installation flow diagram of the present invention;
FIG. 2 is a schematic view of a thruster for hoisting connection;
FIG. 3 is a schematic illustration of the propeller of FIG. 2 after it has been hoisted;
FIG. 4 is a schematic view of eight center positioning points on the propeller mounting platform;
FIG. 5 is a schematic view of the installation of the lower guide bar assembly;
FIG. 6 is a schematic view of the temporary upper guide bar removed;
FIG. 7 is a schematic view of the upper guide bar assembly installed;
FIG. 8 is a schematic illustration of the installation of a hydraulic unit;
FIG. 9 is a schematic view of attaching the baseplate to the ribs of the pod.
In the figure: 1. hoisting a machine; 2. a propeller; 3. a transport rack; 4. the right lower guide plate; 5. a lower guide rod; 6. the right lower guide plate seat; 7. a left lower guide plate; 8. a lower guide rod; 9. a left lower guide plate seat; 10. a temporary upper guide bar; 11. an upper guide rod; 12. an upper guide plate; 13. an upper guide plate seat; 14. a propeller mounting platform; 15. a1 line; 16. a2 line; 17. a B1 line; 18. a hydraulic unit; 19. a base plate; 20. a pod; 21. a rib plate.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments, and it is to be noted that the embodiments and features of the embodiments of the present application can be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper surface", "lower surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "forward", "reverse", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
As shown in fig. 1, in the installation method of the retractable propulsion device of the deepwater dynamic positioning crude oil carrier, the retractable propulsion device to be installed is referred to as a retractable push, the bow of the carrier has two retractable pushes, namely a port retractable push and a starboard retractable push, and the types of the two retractable pushes are as follows: KST-220 LF/BR, wherein the design positions of the port telescopic push are as follows: the central position of the vertical axis is 730mm from the midship. The design positions of the starboard telescopic push are as follows: the vertical axis is centered at 2330mm from the midship. The telescopic pushers are specifically arranged on the deck surface of the ship body and directly welded with the deck surface during installation, and because the installation methods of the two telescopic pushers are the same, the patent only describes the installation method of one telescopic pusher.
The telescopic pusher comprises a propeller, a lower guide rod component, an upper guide rod component, a hydraulic unit, a main motor, a bottom plate, a guide cover, a locking device and the like.
The installation method specifically comprises the following steps:
and (4) checking the integrity of all equipment, and checking whether the goods are consistent with the drawing according to random data and a packing list, wherein the goods are missed or not. And the appearance of the equipment is checked to see whether the equipment is damaged in the transportation and carrying processes. Checking all accessories according to a drawing and a packing list, and classifying and marking;
the quick-wear parts such as a display instrument, a relay, a sensor and the like on the telescopic propelling device are dismounted or mounted with a protection device before hoisting so as to avoid damage; the exposed hole cover needs to be wrapped to prevent foreign matters from entering the hole cover, and all oil pipe openings need to be sealed; polishing and flattening the mounting surface of the upper guide plate seat by white cloth, and polishing and flattening the mounting surface of the lock hook seat in bulk; machining the two lower guide plate seats to enable the mounting surfaces of the lower guide plate seats and the lower guide rod to be well attached; a coupling is mounted to the motor output shaft.
The preparation work before the installation helps the smooth expansion and the serialization of the next process to go on, and in the installation work of the prior art, vulnerable parts such as display instruments, relays and sensors are extremely easy to be collided or scraped and are damaged, and the protection device should be detached or installed before the hoisting, so that the damage rate of the equipment is greatly reduced. The exposed hole cover needs to be bound so as to prevent foreign matters from entering the hole cover and ensure that the equipment can work normally.
In step 2, as shown in fig. 2 and 3, hoisting the propeller 2 by using the crane 1 specifically includes the following steps: 2.1, the propeller 2 is positioned on the transportation frame 3, and the crane 1 is connected with a lifting lug on the transportation frame 3 and a lifting lug on the propeller 2; 2.2, hoisting and turning over the propeller to a vertical position by the crane; step 2.3, the lower guide plate is arranged below the propeller and tied to a lifting lug of the propeller through a rope; and 2.4, slowly hanging the propeller downwards into the surrounding well of the mounting section of the propeller device from the upper part.
When the propeller is hung, the following matters need to be taken into consideration:
a. all guide rods and hydraulic cylinders cannot be used as lifting points of the propeller. The surfaces of all moving parts can not use steel wire ropes as hoisting locks. These surfaces are to be protected exceptionally;
b. when the propeller is hoisted, the equipment on the gear box is protected by cloth, rubber, protective plates and the like to prevent the equipment from being scraped by the hoisting tool.
c. If the hydraulic pipe influences the hoisting, the hydraulic pipe is dismantled and sealed protection is timely made.
d. Because the center of gravity of the equipment is not positioned in the center of the propeller, the propeller can incline during hoisting.
e. Care is taken not to touch the hull structure damaging equipment (especially the gearbox and telescoping ducts).
f. If the boat hull is touched carelessly, the paint repair should be noticed.
The beneficial effects produced by the step 2 are as follows: the lifting point is emphasized, in the prior art, the guide rod and the hydraulic cylinder are often used as the lifting point of the propeller, and the guide rod and the hydraulic cylinder are easily damaged in the lifting process; the lower guide plate is arranged after the propeller is hoisted at the installation site, and the lower guide plate is arranged again for protecting the lower guide plate.
the method specifically comprises the following steps: step 3.1, eight central positioning points are arranged on the propeller mounting platform, the positioning points are represented by stars in the figure, and can be used for positioning as shown in figure 4; step 3.2, checking through an observation port on the steering gear box, and confirming that the rudder angle is at the position of 0 degree before the platform is positioned and adjusted; 3.3, after the thruster is located on the deck, the allowable error of front, back, left and right is +/-2 mm, and data is recorded, and the levelness of the platform is adjusted by a level meter in the period, wherein the error of the levelness is +/-2 mm; step 3.4, after the adjustment is finished, before the platform is welded, whether the installation position is consistent with a drawing is confirmed again, and a gap between the air guide sleeve and the opening of the ship body is checked by using a vertical line, wherein the gap is not less than 50 mm; step 3.5, welding the propeller mounting platform to the ship body, monitoring deformation conditions in time in the welding process and adjusting the welding sequence; and 3.6, after welding, carrying out flaw detection on the welding seam and reporting the flaw detection.
the method specifically comprises the following steps: as shown in fig. 5, step 4.1, mounting the right lower guide 4 (about 482 kg) on the lower guide bar 5, and pre-fastening the right lower guide holder 6 to the right lower guide 4 with bolts; step 4.2, mounting the left lower guide plate 7 (about 637 kg) on a lower guide rod 8, and pre-connecting and fixing the left lower guide plate seat 9 on the left lower guide plate 7 by using bolts; step 4.3, fixing the left lower guide plate and the right lower guide plate with the left lower guide plate seat and the right lower guide plate seat respectively through spot welding by using a welding machine; 4.4, adjusting the left lower guide plate seat and the right lower guide plate seat, and welding the left lower guide plate seat and the right lower guide plate seat to the ship body after the adjustment is finished; and 4.5, reaming the holes and mounting the hinged bolts.
Step 5, installing a guide rod assembly:
as shown in fig. 6 and 7, before the upper guide rod assembly is installed, the temporary upper guide rod 10 is removed, and then the formal upper guide rod assembly is installed, wherein the upper guide rod assembly comprises an upper guide rod 11, an upper guide plate 12 and an upper guide plate seat 13, the upper guide plate in the upper guide rod assembly is fixed on the upper guide plate seat by bolts, the upper guide plate seat is divided into two halves, one half is welded with the hull, and the other half is welded with the upper guide rod in the upper guide rod assembly.
Step 6, installing a hydraulic unit:
as shown in fig. 8, the method specifically includes the following steps: step 6.1, 5% of antirust oil is filled in the hydraulic unit, and the antirust oil in the oil tank is discharged before oil is injected; step 6.2, connecting the A1 pipeline 15, the A2 pipeline 16 and the B1 pipeline 17 on the propeller mounting platform 14 with the hydraulic unit 18; 6.3, installing a hydraulic unit and a temporary pipeline for connecting the hydraulic unit and the telescopic hydraulic cylinder; step 6.4, injecting about 250 to 300L of hydraulic oil when the propeller is at the extending position; 6.5, blowing the equipment pipeline and the hydraulic cylinder by using a blowing tool; and 6.6, filling the energy accumulator with N2 gas, wherein the pressure of the N2 gas is 14.7MPa, and carrying out 2000cm high-capacity labor intensity distribution.
Step 7, stretching test:
the telescopic test specifically comprises the following steps: step 7.1, tying one end of a safety rope on the suspender, connecting the other end of the safety rope with the propeller, wherein the safety rope is not stressed under the non-emergency condition; and 7.2, retracting the propeller by using a hydraulic system to ensure that the propeller can be smoothly lifted.
The telescoping test in step 7 has two technical characteristics: firstly, a safety rope is added during the telescopic test, and when the test is unsuccessful and an emergency occurs, the safety rope can limit and protect the propeller; and secondly, the front and back sequence of the telescopic test is changed, the telescopic test is started after the hydraulic unit is installed, the fault can be conveniently eliminated, the maintenance and overhaul of the equipment are facilitated, and the installation efficiency is improved.
the method for installing the main motor specifically comprises the following steps: step 8.1, cleaning the base surface of the motor before installation, and respectively installing the two half parts of the coupling on the main motor and the propeller; step 8.2, removing the cover of the propeller coupling, and hoisting the main motor (about 6.7 tons); 8.3, centering the motor and the propeller by using a dial indicator; 8.4, screwing the bolt and the gasket on the motor base, and confirming centering again; step 8.5, mounting components on the coupling and screwing bolts on the coupling; step 8.6, grease is injected into the coupling; and 8.7, installing a positioning pin on the motor base.
in step 11, the step of installing the locking device specifically includes the following steps: step 11.1, adjusting a safety valve of the hydraulic unit to 8MPa, and gradually increasing a set value; step 11.2, slowly lifting the thruster and keeping the thruster at the retraction position; step 11.3, hoisting the locking device by using a hoist (about 1.5 tons); and 11.4, adjusting the locking device and welding the seat plate of the locking device to the ship body.
Notes in step 11:
a. the angle between the lock hook and the lock hook body is ensured to be 90 degrees during installation, and the lock hook is inclined when being opened.
b. And effective measures are taken to reduce welding deformation during welding of the lock hook seat.
c. Do not adjust the length of the cylinder (KHI adjusted).
d. The clearance between the locking device and the hanger bar is checked and adjusted to be about 10mm by slightly grinding the locking hook or welding the steel plate if necessary.
Step 12, installing an air panel of the locking device: and installing an air panel of the locking device on the ship body, connecting a compressed air pipe, and rechecking whether the locking device works normally without interference.
Step 13, installing a bottom plate: and adjusting the bottom plate of the propeller, lifting the propeller to a folded position, adjusting the position of the bottom plate according to the installation requirement, and installing the bottom plate on the propeller.
And 14, reporting and connecting the remaining oil pipes, injecting oil, and connecting cables to complete the installation of the telescopic propulsion device.
Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method for installing a telescopic propulsion device of a deepwater dynamically positioned crude oil carrier is characterized by comprising the following steps:
step 1, preparation work before installation: before hoisting, a protection device is required to be dismounted or mounted on a quick-wear part on the telescopic propelling device so as to avoid damage; the exposed hole cover needs to be wrapped to prevent foreign matters from entering the hole cover, and all oil pipe openings need to be sealed; polishing and flattening the mounting surface of the upper guide plate seat by white cloth, and polishing and flattening the mounting surface of the lock hook seat in bulk; machining the two lower guide plate seats to enable the mounting surfaces of the lower guide plate seats and the lower guide rod to be well attached; mounting a coupling to the motor output shaft;
step 2, hoisting the propeller by using a crane: on the ship body installed in sections, when the installation section of the propulsion device is provided with relevant adjacent parts and outer plates by welding, and before the section is butted with the next section, a propeller is hung into the installation section of the propulsion device on the ship body by using a crane;
step 3, positioning and welding a propeller mounting platform;
step 4, mounting a lower guide rod assembly;
step 5, installing a guide rod assembly;
step 6, installing a hydraulic unit;
step 7, performing telescopic test;
step 8, installing a main motor;
step 9, temporarily attaching the bottom plate to a rib plate of the air guide sleeve;
step 10, mounting the hinged bolt of the upper guide plate seat: in the telescopic process, the position of the upper guide plate is properly adjusted according to the condition, hinged bolts of the upper guide plate and the guide plate seat are configured, and a limit switch box switch seat is installed;
step 11, mounting a locking device;
step 12, installing an air panel of the locking device: installing an air panel of the locking device on the ship body, connecting a compressed air pipe, and rechecking whether the locking device works normally without interference;
step 13, installing a bottom plate: adjusting a bottom plate of the propeller, lifting the propeller to a retracted position, adjusting the position of the bottom plate according to installation requirements, and installing the bottom plate on the propeller;
and 14, reporting and connecting the remaining oil pipes, injecting oil, and connecting cables to complete the installation of the telescopic propulsion device.
2. The method for installing the retractable propulsion unit of the deepwater dynamically positioned crude oil carrier according to claim 1, wherein the method comprises the following steps: in the step 2, hoisting the propeller into the propeller by using the crane specifically comprises the following steps: 2.1, the propeller is positioned on the transportation frame, and the crane is connected with the lifting lug on the transportation frame and the lifting lug on the propeller; 2.2, hoisting and turning over the propeller to a vertical position by the crane; step 2.3, the lower guide plate is arranged below the propeller and tied to a lifting lug of the propeller through a rope; and 2.4, slowly hanging the propeller downwards into the surrounding well of the mounting section of the propeller device from the upper part.
3. The method for installing the retractable propulsion unit of the deepwater dynamically positioned crude oil carrier according to claim 1, wherein the method comprises the following steps: in step 3, the positioning and welding of the propeller mounting platform specifically comprises the following steps: step 3.1, eight central positioning points are arranged on the propeller mounting platform and can be used for positioning; step 3.2, checking through an observation port on the steering gear box, and confirming that the rudder angle is at the position of 0 degree before the platform is positioned and adjusted; 3.3, after the thruster is located on the deck, the allowable error of front, back, left and right is +/-2 mm, and data is recorded, and the levelness of the platform is adjusted by a level meter in the period, wherein the error of the levelness is +/-2 mm; step 3.4, after the adjustment is finished, before the platform is welded, whether the installation position is consistent with a drawing is confirmed again, and a gap between the air guide sleeve and the opening of the ship body is checked by using a vertical line, wherein the gap is not less than 50 mm; step 3.5, welding the propeller mounting platform to the ship body, monitoring deformation conditions in time in the welding process and adjusting the welding sequence; and 3.6, after welding, carrying out flaw detection on the welding seam and reporting the flaw detection.
4. The method for installing the retractable propulsion unit of the deepwater dynamically positioned crude oil carrier according to claim 1, wherein the method comprises the following steps: in the step 4, the installation of the lower guide rod assembly specifically comprises the following steps: step 4.1, mounting the right lower guide plate on the lower guide rod, and pre-connecting and fixing the right lower guide plate seat on the right lower guide plate by using a bolt; step 4.2, mounting the left lower guide plate on the lower guide rod, and pre-connecting and fixing the left lower guide plate seat on the left lower guide plate by using bolts; step 4.3, fixing the left lower guide plate and the right lower guide plate with the left lower guide plate seat and the right lower guide plate seat respectively through spot welding by using a welding machine; 4.4, adjusting the left lower guide plate seat and the right lower guide plate seat, and welding the left lower guide plate seat and the right lower guide plate seat to the ship body after the adjustment is finished; and 4.5, reaming the holes and mounting the hinged bolts.
5. The method for installing the retractable propulsion unit of the deepwater dynamically positioned crude oil carrier according to claim 1, wherein the method comprises the following steps: in the step 5, before the upper guide rod assembly is installed, the temporary upper guide rod is removed, and then the formal upper guide rod assembly is installed, wherein the upper guide rod assembly comprises an upper guide rod, an upper guide plate and an upper guide plate seat, the upper guide plate in the upper guide rod assembly is fixed on the upper guide plate seat through bolts, the upper guide plate seat is divided into two halves, one half is welded with the ship body, and the other half is welded with the upper guide rod in the upper guide rod assembly.
6. The method for installing the retractable propulsion unit of the deepwater dynamically positioned crude oil carrier according to claim 1, wherein the method comprises the following steps: in the step 6, the hydraulic unit is installed, and the method specifically comprises the following steps: step 6.1, 5% of antirust oil is filled in the hydraulic unit, and the antirust oil in the oil tank is discharged before oil is injected; step 6.2, connecting the A1 pipeline, the A2 pipeline and the B1 pipeline on the propeller mounting platform with a hydraulic unit; 6.3, installing a hydraulic unit and a temporary pipeline for connecting the hydraulic unit and the telescopic hydraulic cylinder; step 6.4, injecting about 250 to 300L of hydraulic oil when the propeller is at the extending position; 6.5, blowing the equipment pipeline and the hydraulic cylinder by using a blowing tool; and 6.6, charging the accumulator with N2 gas.
7. The method for installing the retractable propulsion unit of the deepwater dynamically positioned crude oil carrier according to claim 6, wherein the method comprises the following steps: and the pressure of the N2 gas is 14.7MPa, and the capacity is 2000 cm.
8. The method for installing the retractable propulsion unit of the deepwater dynamically positioned crude oil carrier according to claim 1, wherein the method comprises the following steps: in the step 7, the telescopic test specifically comprises the following steps: step 7.1, tying one end of a safety rope on the suspender, connecting the other end of the safety rope with the propeller, wherein the safety rope is not stressed under the non-emergency condition; and 7.2, retracting the propeller by using a hydraulic system to ensure that the propeller can be smoothly lifted.
9. The method for installing the retractable propulsion unit of the deepwater dynamically positioned crude oil carrier according to claim 1, wherein the method comprises the following steps: in step 8, the step of installing the main motor specifically includes the steps of: step 8.1, cleaning the base surface of the motor before installation, and respectively installing the two half parts of the coupling on the main motor and the propeller; 8.2, removing the cover of the propeller coupling and hoisting the main motor; 8.3, centering the motor and the propeller by using a dial indicator; 8.4, screwing the bolt and the gasket on the motor base, and confirming centering again; step 8.5, mounting components on the coupling and screwing bolts on the coupling; step 8.6, grease is injected into the coupling; and 8.7, installing a positioning pin on the motor base.
10. The method for installing the retractable propulsion unit of the deepwater dynamically positioned crude oil carrier according to claim 1, wherein the method comprises the following steps: in step 11, the step of installing the locking device specifically includes the following steps: step 11.1, adjusting a safety valve of the hydraulic unit to 8MPa, and gradually increasing a set value; step 11.2, slowly lifting the thruster and keeping the thruster at the retraction position; step 11.3, hoisting the locking device by using a hoist; and 11.4, adjusting the locking device and welding the seat plate of the locking device to the ship body.
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