CN116767449A - Heightening and refitting method for marine ship aircraft platform - Google Patents

Heightening and refitting method for marine ship aircraft platform Download PDF

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Publication number
CN116767449A
CN116767449A CN202310841507.9A CN202310841507A CN116767449A CN 116767449 A CN116767449 A CN 116767449A CN 202310841507 A CN202310841507 A CN 202310841507A CN 116767449 A CN116767449 A CN 116767449A
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China
Prior art keywords
aircraft platform
steel truss
platform
jig frame
heightening
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CN202310841507.9A
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Chinese (zh)
Inventor
张锐
邹相凡
朱俊彦
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Guangzhou Wenchong Shipbuilding Co ltd
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Guangzhou Wenchong Shipbuilding Co ltd
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Priority to CN202310841507.9A priority Critical patent/CN116767449A/en
Publication of CN116767449A publication Critical patent/CN116767449A/en
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Abstract

The invention relates to the technical field of ship transformation and processing, and discloses a marine ship aircraft platform heightening and refitting method, which comprises the steps of performing simulation on an AutoCAD according to prefabricated steel truss size coordinates to determine a center point; determining the number, the height and the positions of the jig frames according to the center point, and manufacturing at a wharf; prefabricating a steel truss on the jig frame; removing the aircraft platform from the vessel; lifting the dismantled aircraft platform to a wharf and folding the steel truss to form a new aircraft platform; according to the invention, the jig frame is arranged through the wharf, the steel truss is built on the jig frame, the original aircraft platform is cut, the original aircraft platform and the prefabricated steel truss are folded at the wharf, and then the folded new aircraft platform is hoisted to the ship for assembly, so that the steel truss is not required to be turned over in the whole process, the modification quality is greatly improved, and the modification period is shortened.

Description

Heightening and refitting method for marine ship aircraft platform
Technical Field
The invention relates to the technical field of ship transformation and processing, in particular to a marine ship plane platform heightening and modifying method.
Background
The overall size of the existing ship helicopter platform is about: the length is 32m times the width is 25m times the height is 20m, the platform is made of aluminum alloy, the supporting steel truss is made of carbon steel, and the supporting steel truss is connected with the aluminum alloy platform through bolts. With the continuous upgrading and reconstruction of the maritime engineering, in order to enable the helicopter platform to adapt to the working environment better, the helicopter platform is generally required to be heightened and reconstructed. In the prior art, the reverse construction method is generally used for transformation, the steel truss needs to be overturned during reverse construction, the working procedure is complex, the steel truss is made of aluminum alloy, the steel truss is easy to deform during the overturning process, the correction work is more after overturning, and the transformation period is greatly prolonged.
Disclosure of Invention
The invention aims to provide a marine ship aircraft platform heightening and refitting method which is simple in working procedures and short in refitting period.
In order to achieve the above purpose, the invention provides a marine vessel aircraft platform heightening and refitting method, which comprises the following steps:
simulating and determining a center point on an AutoCAD according to the prefabricated steel truss size coordinates;
determining the number, the height and the positions of the jig frames according to the center point, and manufacturing at a wharf;
prefabricating a steel truss on the jig frame;
removing the aircraft platform from the vessel;
lifting the dismantled aircraft platform to a wharf and folding the steel truss to form a new aircraft platform;
and lifting the new aircraft platform to a ship for installation.
Preferably, the jig frame comprises an iron pier and a combined pier, and the determining of the number, the height and the position of the jig frame according to the center point comprises:
and drawing a longitudinal/transverse center line, a left/right main support tube center line and an outline of the steel truss on the ground by taking the center point as a reference, determining the number and the positions of the iron piers according to the connection stress points of the steel truss, symmetrically arranging combined piers along the longitudinal center line according to the part of the to-be-dismantled aircraft platform, which exceeds the steel truss, and calculating the heights of the iron piers and the combined piers according to the height dimension of the steel truss.
Preferably, the manufacturing at the wharf comprises:
and (3) filling a steel plate in the determined installation position, installing an iron pier or a combined pier on the steel plate, and installing a jig frame template on the iron pier or the combined pier.
Preferably, the installing the jig frame template on the iron pier or the combined pier comprises:
firstly, a horizontal reference surface is drawn by laser, and then the height of the jig frame template is positioned by taking the horizontal reference surface as a reference.
Preferably, the jig frame template is a crescent jig frame template.
Preferably, the prefabricating the steel truss on the jig frame comprises:
and carrying out subsection prefabrication on the steel truss, and erecting the subsection on the jig frame template by taking the left main supporting tube and the right main supporting tube at the bottom as references.
Preferably, said removing the aircraft platform from the vessel comprises:
measuring the positioning size of the folding opening of the aircraft platform on the ship;
erecting inverted hangers at four corners of the aircraft platform, disassembling part of pipelines and safety nets, prolonging the original I-beam, and welding lifting lugs on the prolonged I-beam;
temporary diagonal braces and steel wire ropes are arranged on supporting legs of the aircraft platform;
dismantling or breaking the fire tube, the cable, the inclined ladder and the pavement platform at the notch;
and erecting an inverted hanging frame on the top of the supporting leg of the aircraft platform, firstly cutting a supporting tube on the top end of the supporting leg after a hanging hook of the floating crane, and then cutting a supporting tube connected with a compass deck.
Preferably, the lifting the dismantled aircraft platform to the dock to fold with the steel truss includes:
horizontally placing the plane platform on the steel truss section through a floating crane for folding and positioning;
and after the folding is finished, performing precision detection, weld appearance inspection and flaw detection.
Preferably, the lifting the new aircraft platform to the ship for installation includes:
removing the old structure of the compass deck thick plate area on the ship and the interior of the cab;
a guide tool is arranged at the folding opening of the inclined strut pipe;
the new aircraft platform is mounted from the quay to the vessel using a floating crane.
Preferably, the guiding tool comprises a guiding semicircular plate arranged on the outer side of the diagonal pipe folding opening of the head end of the new aircraft platform and a guiding code plate arranged at the diagonal pipe folding opening of the supporting leg.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the jig frame is arranged through the wharf, the steel truss is positively built on the jig frame, the original aircraft platform is cut, the original aircraft platform and the prefabricated steel truss are folded at the wharf, and then the folded new aircraft platform is hoisted to a ship for assembly, so that the whole process does not need to turn over the steel truss, the deformation of the steel truss is avoided, the refitting quality is greatly improved, the construction period is shortened by at least two days, a powerful technical guarantee is provided for refitting the same type of ships, and the competitiveness of a company is improved for bearing similar projects in the future.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 shows a flow chart of a marine vessel aircraft platform heightened retrofit method of the present invention;
FIG. 2 shows a schematic view of the structure of a steel truss according to an embodiment of the present invention;
FIG. 3 shows a schematic diagram of a folded jig frame distribution according to an embodiment of the invention;
FIG. 4 shows a side view of a folded matrix distribution of an embodiment of the present invention;
FIG. 5 shows a lateral schematic view of a closed jig frame according to an embodiment of the invention;
FIG. 6 shows a schematic view of the structure of an iron pier according to an embodiment of the present invention;
FIG. 7 illustrates an old aircraft platform survey callout map according to an embodiment of the present invention;
FIG. 8 shows a schematic diagram of the G-G surface of FIG. 6 in accordance with an embodiment of the invention;
FIG. 9 illustrates a top view of an aircraft platform pre-process according to an embodiment of the invention;
FIG. 10 illustrates a side view of an aircraft platform pre-process according to an embodiment of the invention;
FIG. 11 shows a temporary diagonal brace installation schematic of an embodiment of the invention;
FIG. 12 shows a schematic view of a wire rope installation of an embodiment of the present invention;
FIG. 13 illustrates a schematic diagram of the removal of an aircraft platform boat according to an embodiment of the present invention;
FIG. 14 illustrates a dock closure schematic of an aircraft platform in accordance with an embodiment of the present invention;
FIG. 15 illustrates a steel truss closure temporary stiffening installation schematic of an embodiment of the invention;
FIG. 16 illustrates a guide tooling installation position diagram of an embodiment of the present invention;
FIG. 17 is a schematic view of a guiding tool according to an embodiment of the present invention;
fig. 18 shows a process diagram of lifting an aircraft platform on board an aircraft in accordance with an embodiment of the invention.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
In this embodiment, due to the upgrade and reconstruction of the main crane, the aircraft platform needs to be 3m high (i.e. a 3m high steel truss and ladder walkway are newly added at the top end of the supporting leg).
The embodiment discloses a marine vessel aircraft platform heightening and refitting method, which specifically comprises the following steps of. As shown in fig. 1.
Step S1: before an aircraft platform is launched, a jig frame is vertically transformed at a wharf, and a 3m steel truss section is prefabricated on the jig frame;
step S2: before the ship is docked, the aircraft platform is firstly removed from the ship by using a floating crane at the dock, lifted to the dock, and laid on a 3m steel truss section for integral folding;
step S3: after the plane platform is transformed, the helicopter platform is lifted from the wharf to the ship by using the floating crane, and then a newly-added ladder walkway and other accessories are installed to recover fire-fighting pipelines, cables and the like.
The above method will be specifically described below.
1. Design of moulding bed
1.1 determining a jig frame:
before construction, CAD drawing of the steel truss is designed according to the size, then the transverse center line and the longitudinal center line of the steel truss segment are simulated on an AutoCAD, and then the center point, namely the intersection of the transverse center line and the longitudinal center line, is determined. Since in this embodiment, there is a difference in size between the aircraft platform to be dismantled and the steel truss, the aircraft platform to be dismantled may exceed the steel truss in the left-right direction and the rear end, as shown in fig. 2 and 3, so the jig frame needs to design the number, the position and the height of the iron piers and the combined piers respectively based on the combined piers and the iron piers.
1.1.1 design of iron pier: dividing the longitudinal/transverse center line, the center line of the left/right main support tube and the outline of the steel truss on the ground by taking the center point as a reference, determining the number and the positions of the iron piers according to the connection stress points of the steel truss, namely arranging iron pier mounting points at the intersections of the left/right support tubes and other steel tubes, and calculating the height of the iron piers according to the height dimension of the steel truss.
1.1.2 design of the composite pier: the design is similar to that of the iron piers, and the difference is that the parts of the plane platform to be dismantled, which exceed the steel trusses, are symmetrically arranged along the longitudinal center line, namely, the contour lines of the plane platform to be dismantled are drawn according to the size of the plane platform to be dismantled by taking the center point as a reference, then the contour lines are symmetrically arranged around the contour lines by taking the longitudinal center line, the arranged quantity is arranged according to the stress points, and the height is about 3m higher than that of the iron piers, namely, the height of one steel truss exceeds that of the iron piers (as shown in figures 3-5).
In this embodiment, 10 25T iron piers are designed with a height of 1000mm and 8 composite piers with a height of 4050mm, as shown in FIG. 3.
1.2 mounting of the bed-jig
The iron piers and the composite piers are basically the same in structure and different in height, and the installation method is that steel plates are padded at the determined installation positions, then the iron piers or the composite piers are installed on the steel plates, and the jig frame templates are installed on the iron piers or the composite piers. The jig frame template is crescent, namely the top is arc-shaped, as shown in fig. 6, the supporting tube is circular, so that the jig frame and the supporting tube are matched more tightly, and the transformation difficulty is reduced.
Before the jig frame template is installed, a horizontal reference surface is firstly stamped by utilizing laser, and then the height positioning of the jig frame template is carried out by taking the horizontal reference surface as a reference. When the jig frame template is installed, the center distance between the left main support pipe and the right main support pipe and the horizontal center line of the left main support pipe and the right main support pipe are required to be ensured to be on the same horizontal plane, and the deviation is not more than +/-2 mm.
Prefabrication of 2 steel truss
And carrying out subsection prefabrication on the steel truss, and carrying out erection on the subsection on the basis of the left main supporting tube and the right main supporting tube at the bottom on a jig frame template according to CAD drawing. During the normal construction, the horizontal included angles of the connection lines of the port main support pipe, the starboard main support pipe and the connection end of the compass deck on the ship are required to be consistent with the horizontal included angles of the connection surface of the compass deck on the ship, namely the left main support pipe and the right main support pipe are longer and shorter. Referring to fig. 2, in this embodiment, the horizontal angle of the connection line is 65 °, and the port main support tube is relatively short.
And a compass deck thick plate is prefabricated at the joint of the steel truss and the compass deck, so that the connection is more stable when the steel truss is connected with the compass deck subsequently. The method comprises the steps of prefabricating a compass deck thick plate at the connecting end of a port main support pipe and a compass deck, bulk loading the compass deck thick plate on a starboard main support pipe on a ship, and welding after a fillet weld of the starboard support pipe and the compass deck thick plate is reinstalled on an aircraft platform, adjusting a gateway on site and positioning. It should be noted that temporary reinforcement needs to be arranged at the right-angle joint of the bottom of the steel truss, so that the support is prevented from being deformed, and the temporary reinforcement is reinforced by angle steel.
3 removal of aircraft platform
The aircraft platform in this embodiment is a helicopter platform.
3.1 data measurement
Before the helicopter platform is dismantled, a total station is used for detecting the positioning size of a folding opening of an old structure of an original ship, and the positioning size is used as a reference basis for prefabrication of a steel truss segment and folding positioning of the steel truss segment, supporting legs and a compass deck, and specific measuring positions are shown in fig. 7 and 8. Wherein L1 represents the distance from the center point of the port main support pipe to the compass deck, L2 represents the vertical distance from the center point of the starboard main support pipe to the connection point of the port main support pipe and the compass deck, L3 and L4 represent the distance from the center point of the port main support pipe and the starboard main support pipe to the right end point of the support leg, H1 and H2 represent the height from the connection point of the port main support pipe and the starboard main support pipe to the A deck, H3 and H4 represent the height from the center point of the port main support pipe and the starboard main support pipe to the A deck, H5 and H6 represent the height from the connection point of the port main support pipe and the starboard main support pipe to the A deck, B1 and B2 represent the distance between the connection point of the port main support pipe and the starboard main support pipe and the compass deck, B3 and B4 represent the distance between the center point of the port main support pipe and the starboard main support pipe and the connection point of the starboard main support pipe and the starboard main support leg, and B5 and B6 represent the distance between the connection point of the port main support pipe and the starboard. Comparing the measured distance with the dimensional coordinates of the steel truss, and checking whether adjustment is needed.
3.2 helicopter platform Pre-machining
Firstly, erecting inverted hangers at four corners of a helicopter platform, then disassembling part of pipelines and safety nets, prolonging the original I-beam, and welding lifting lugs on the prolonged I-beam. After the installation and welding of the I-beam and the lifting lug are completed, the appearance inspection and flaw detection of the welding seam are required; the I-beam and the lifting lug can be used after being checked to be qualified. As shown in fig. 9 and 10.
3.3 temporary diagonal bracing and installation of Steel wire rope
After the helicopter platform is dismantled, the supporting legs lose connection with the compass deck, and temporary diagonal braces and steel wire ropes are arranged to prevent the supporting legs from collapsing. The temporary diagonal bracing is formed by splicing a plurality of round pipes.
3.3.1 installation of temporary diagonal braces
The columns of the support legs are first connected to the a deck by long round tubes (Φ219×10) and then connected to the columns of the support legs using a plurality of short round tubes (Φ150× 10) to form temporary diagonal braces, as shown in fig. 11.
3.3.2 installation of Steel wire rope
Firstly, preparing a plurality of 5T steel wire ropes, then installing 5T flanges at two ends of each steel wire rope, then installing 5T shackle +10T lifting lug connection groups on free ends of the front wall of a living area and upright posts of supporting legs respectively, and then connecting the steel wire ropes with lifting lugs through the flanges to form a steel wire rope supporting network, as shown in figure 12. 5T shackle +10T lug connection group is provided with 5 on living area front wall free end vertical direction, is provided with 2 on the stand of supporting leg, and specific setting number is confirmed according to the height of living area front wall and the height of supporting leg.
In addition, temporary reinforcement is needed, namely, angle steel is arranged at the notch of the supporting leg for reinforcement, and the helicopter platform is detached after being installed.
3.4 removal of aircraft platforms
And dismantling or breaking the fire fighting pipe, the cable, the inclined ladder, the pavement platform and the like at the notch, and erecting an inverted hanging frame at the top end of the supporting leg of the helicopter platform. After the hook of the floating crane, the supporting tube is cut from the top end of the supporting leg, and then the supporting tube is cut from the compass deck.
The steel wire ropes of the floating crane adopt 4 45T steel wire ropes with the length of 50m, each steel wire rope is connected with the hanger through a 55T shackle, the included angle between the adjacent steel wire ropes is 46 degrees, the parameters of the main hook and the auxiliary hook of the floating crane are shown in the table 1 and the table 2, and the hoisting process of the floating crane is shown in fig. 13.
TABLE 1 Main hook safety workload Table
Elevation angle (°) of arm support 70 65 60 55 50 45
Workload (t) 2x300 2x275 2x225 2x150 2x100 2x50
Amplitude (m) 28.8 34.9 40.8 46.3 51.5 56.3
Lifting height (m) 70.0 67.2 63.9 60.1 55.8 51.1
Table 2 side hook safety workload table
Elevation angle (°) of arm support 70 65 60 55 50 45
Workload (t) 300 280 260 190 120 70
Amplitude (m) 42.1 50.7 58.9 66.7 74.0 80.7
Lifting height (m) 100.0 95.9 91.2 85.7 79.5 72.8
4 lifting the dismantled plane platform to a wharf to fold with the steel truss prefabricated in sections
The helicopter platform is transported to a wharf by using a floating crane and is horizontally placed on a steel truss section for reconstruction construction, when in construction, angle steel is required to be installed at a folding position, temporary reinforcement is carried out on the section, and then old pipes are detached and replaced on site in stages (as shown in fig. 14 and 15). And after the helicopter platform and the 3m steel truss are folded in sections, performing precision measurement, weld appearance inspection and flaw detection.
5 lifting the new plane platform to the ship for installation
And removing the old structure of the thick plate area of the compass deck on the ship and the interior of the cab, wherein the thick plate of the compass deck on the starboard is replaced on the ship in advance. Note that: before thermal engineering of the thick plate position of the compass deck, glass and the interior of the cab are temporarily and partially removed, and various equipment, instruments, meters, cables and the like in the cab are protected.
The guide tool is arranged at the position of the diagonal bracing tube folding opening at the head end of the helicopter platform and comprises a guide semicircular plate arranged at the outer side of the diagonal bracing tube folding opening at the head end of the helicopter platform and a guide code plate arranged at the diagonal bracing tube folding opening of the supporting leg, and the guide semicircular plate and the guide code plate are matched with each other to provide guide for folding of a new aircraft platform (particularly shown in fig. 16 and 17).
After the transformation of the helicopter platform is completed, the helicopter platform is lifted from the dock to a ship by using a floating crane, the lifting process is as shown in fig. 18, and finally, outfitting parts such as a channel platform, an inclined ladder and the like are installed, and cables, pipelines and other accessories are restored.
By modifying the aircraft platform, a whole set of construction flow is formed, and all the steps are strictly executed according to the formulated technological requirements: construction planning, prefabrication of a steel truss, dismantling of a helicopter platform, dock folding of the helicopter platform, hoisting of the helicopter platform and finishing. Through the whole set of refitting technology, the refitting quality is greatly improved, the period is shortened, and powerful technical support is provided for refitting the same type of ship. The competition is improved for the company to accept similar projects at a later time.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention. In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims (10)

1. The marine vessel aircraft platform heightening and refitting method is characterized by comprising the following steps of:
simulating according to the prefabricated steel truss size coordinates to determine a center point;
determining the number, the height and the positions of the jig frames according to the center point, and manufacturing at a wharf;
prefabricating a steel truss on the jig frame;
removing the aircraft platform from the vessel;
lifting the dismantled aircraft platform to a wharf and folding the steel truss to form a new aircraft platform;
and lifting the new aircraft platform to a ship for installation.
2. The marine vessel aircraft platform heightening modification method according to claim 1, wherein the jig frame comprises an iron pier and a combined pier, the determining the number, the height and the position of the jig frame according to the center point comprises:
and drawing a longitudinal/transverse center line, a left/right main support tube center line and an outline of the steel truss on the ground by taking the center point as a reference, determining the number and the positions of the iron piers according to the connection stress points of the steel truss, symmetrically arranging combined piers along the longitudinal center line according to the part of the to-be-dismantled aircraft platform, which exceeds the steel truss, and calculating the heights of the iron piers and the combined piers according to the height dimension of the steel truss.
3. The marine vessel aircraft platform heightened modification method of claim 2, wherein the manufacturing at the dock comprises:
and (3) filling a steel plate in the determined installation position, installing an iron pier or a combined pier on the steel plate, and installing a jig frame template on the iron pier or the combined pier.
4. A marine vessel aircraft platform heightening modification method according to claim 3, wherein the mounting of a jig template on the iron pier or the combined pier comprises:
firstly, a horizontal reference surface is drawn by laser, and then the height of the jig frame template is positioned by taking the horizontal reference surface as a reference.
5. The marine vessel aircraft platform heightening modification method according to claim 4, wherein the jig frame template is a crescent-shaped jig frame template.
6. The marine vessel aircraft platform heightening modification method according to claim 4, wherein the prefabricating a steel truss on the jig frame comprises:
and carrying out subsection prefabrication on the steel truss, and erecting the subsection on the jig frame template by taking the left main supporting tube and the right main supporting tube at the bottom as references.
7. The marine vessel aircraft platform heightened modification method of any one of claims 1-6, wherein said removing the aircraft platform from the vessel comprises:
measuring the positioning size of the folding opening of the aircraft platform on the ship;
erecting inverted hangers at four corners of the aircraft platform, disassembling part of pipelines and safety nets, prolonging the original I-beam, and welding lifting lugs on the prolonged I-beam;
temporary diagonal braces and steel wire ropes are arranged on supporting legs of the aircraft platform;
dismantling or breaking the fire tube, the cable, the inclined ladder and the pavement platform at the notch;
and erecting an inverted hanging frame on the top of the supporting leg of the aircraft platform, firstly cutting a supporting tube on the top end of the supporting leg after a hanging hook of the floating crane, and then cutting a supporting tube connected with a compass deck.
8. The marine vessel aircraft platform heightening modification method according to claim 7, wherein lifting the removed aircraft platform to a dock with the steel truss comprises:
horizontally placing the plane platform on the steel truss section through a floating crane for folding and positioning;
and after the folding is finished, performing precision detection, weld appearance inspection and flaw detection.
9. The marine vessel aircraft platform heightening modification method according to claim 8, wherein lifting the new aircraft platform to a vessel for installation comprises:
removing the old structure of the compass deck thick plate area on the ship and the interior of the cab;
a guide tool is arranged at the folding opening of the inclined strut pipe;
the new aircraft platform is mounted from the quay to the vessel using a floating crane.
10. The marine vessel aircraft platform heightening modification method according to claim 9, wherein the guide tool comprises a guide semicircular plate arranged outside a diagonal bracing pipe folding port of the head end of the new aircraft platform and a guide code plate arranged at the diagonal bracing pipe folding port of the supporting leg.
CN202310841507.9A 2023-07-11 2023-07-11 Heightening and refitting method for marine ship aircraft platform Pending CN116767449A (en)

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Application Number Priority Date Filing Date Title
CN202310841507.9A CN116767449A (en) 2023-07-11 2023-07-11 Heightening and refitting method for marine ship aircraft platform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310841507.9A CN116767449A (en) 2023-07-11 2023-07-11 Heightening and refitting method for marine ship aircraft platform

Publications (1)

Publication Number Publication Date
CN116767449A true CN116767449A (en) 2023-09-19

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