A method for vertical assembly and painting of a self-contained transverse bulkhead section of a ship

Abstract

The application relates to a vertical total assembly and coating method of a self-contained ship transverse bulkhead section, which comprises the following steps: setting a steel structure jig frame in a vacant site of a dock wall, vertically positioning and assembling the transverse bulkhead section, fixing the transverse bulkhead section to the dock wall and adjacent total sections through rigid connection components, and vertically performing gas-electric welding construction and coating operation through two-side full-position movable basket trolleys. The transverse bulkhead section is independently vertically totally assembled without the help of bottom sections and side sections. The application solves the problems of large occupied space, need of turning and low utilization rate of a door machine in traditional horizontal total assembly, simultaneously moves the coating operation from before the ship is docked to the total assembly stage, effectively relieves the coating pressure of the dock, and has the advantages of small occupied space, no need of turning, moved coating process and high welding efficiency.

Description

Technical Field

[0001] This invention relates to the field of ship and marine engineering equipment construction technology, and in particular to a vertical assembly and painting method for independent transverse bulkhead sections of a ship. Background Technology

[0002] Container ships are vessels used to load containers. Ultra-large container ships have large cargo holds, with hatches and cargo holds almost the same width, connected by transverse bulkheads on both sides. Therefore, the construction period of transverse bulkheads is one of the key factors affecting the overall ship construction. A transverse bulkhead section refers to a transverse bulkhead section set along the ship's beam direction and perpendicular to the hull bottom plane. It plays a crucial role in the hull structure by separating compartments, enhancing transverse strength, and ensuring anti-sinking capability.

[0003] Currently, one of the most important methods to accelerate shipbuilding is the assembly of sections. The assembly of transverse bulkhead sections traditionally employs a horizontal assembly method. Transverse bulkhead assembly is generally carried out on an assembly platform within the coverage area of ​​a gantry crane or at the bottom of a dry dock. Existing technologies include methods for vertically lifting and installing transverse bulkhead sections onto positioning base sections and side sections to form a ring, as well as methods for stacking assembly sections to assemble two transverse bulkhead sections on a single assembly platform.

[0004] However, existing technologies still have the following prominent problems: First, the construction site occupies too much space. When the transverse bulkhead sections are assembled horizontally, they are laid flat, and their floor space is several times that of the bulkhead itself. The size of the assembly platform directly affects the number of sections that can be reserved. When multiple ships are being built simultaneously, off-site assembly is required, followed by transport by barge or truck, increasing transportation costs.

[0005] Secondly, the assembly process requires turning and rotating the bulkhead sections, which adds a lot of extra work. After the horizontal bulkhead sections are assembled into complete sections, they must be hoisted, turned, and rotated during the final assembly in the dry dock. Turning cranes are required, resulting in a large amount of additional work such as welding, cutting, grinding, and painting.

[0006] Third, the gantry crane's lifting capacity utilization rate is low. The large-scale assembly and loading of the horizontal main section requires multiple hooks to be connected for lifting and turning, and then switching to the main hook for single-hook rotation and lifting. The weight of the main section can only utilize 33%-50% of the gantry crane's maximum lifting capacity.

[0007] Fourth, the efficiency of welding and painting of the assembly seams is low. In horizontal assembly, the internal structure of the transverse bulkheads is complex, limiting the welding positions for the assembly seams and hindering the use of automated welding equipment.

[0008] Fifth, the pre-docking cargo hold painting work is stressful. In traditional construction methods, the extensive painting work on the cargo holds before the ship leaves the dock requires a lot of overhead cranes, painting manpower, and time resources, affecting the dock's turnaround efficiency.

[0009] Sixth, the weight of the ring section is too large, which places high demands on the lifting capacity of the gantry crane. The price of ultra-large gantry cranes is expensive, and conventional construction companies cannot afford them. Summary of the Invention

[0010] The purpose of this invention is to overcome the technical defects of existing horizontal assembly of transverse bulkhead sections, such as large site occupation, need for turning and rotation, low gantry crane utilization, and high painting operation pressure, and to provide an independent vertical assembly and painting method for transverse bulkhead sections of ships.

[0011] The objective of this invention is achieved as follows: A method for vertical assembly and painting of independent transverse bulkhead sections of a ship, step one: completion of transverse bulkhead section construction; Step 2: Install a steel structure frame at the bottom of the dock in the open space near the dock wall inside the dock. Step 3: Locate the reference position on the steel structure jig for the transverse bulkhead section in the middle of the span; Step 4: After the benchmark segment positioning is completed, the lower end of the segment is welded and fixed to the steel structure jig. At the same time, the segment is rigidly welded and fixed to the dock wall using rigid connection components. Step 5: Hoist the other side transverse bulkhead sections for positioning and assembly. After the connection is fixed, weld the lower end of the section to the steel structure frame. Step 6: Perform welding work on the main assembly seam. The main assembly weld seam is constructed using vertical gas electric welding with a fully movable gantry trolley set on both sides of the top of the deck. Step 7: Proceed with the positioning, assembly, fixing and welding of the subsequent transverse bulkhead sections in sequence. The transverse bulkhead sections are rigidly fixed to each other using rigid connection components. Step 8: After the vertical assembly welding of the transverse bulkhead section is completed, use the two-sided all-position mobile trolley to carry out the assembly weld seam and the painting work of the entire section. Step nine: Remove the rigid connection components and hoist the transverse bulkhead sections one by one for installation.

[0012] Furthermore, in step two, when multiple transverse bulkhead sections are being constructed simultaneously, several steel structure jigs for the bottom of the transverse bulkheads are fabricated at the same time, and the jigs are rigidly connected to each other with No. 20 channel steel to form an integral steel structure jig.

[0013] Furthermore, in step four, the rigid connection assembly includes a No. 20 channel steel and a steel structure channel tie beam bridge, which, after being rigidly welded and fixed, also serves as a passageway between the transverse bulkhead section and the land.

[0014] Furthermore, the two-sided all-position movable basket trolley includes two symmetrically arranged all-position movable basket supports, an eye plate, and two all-position movable baskets. The eye plate is set on the central axis of the top deck of the transverse bulkhead section. The all-position movable basket support includes a basket support frame and a movable basket track beam. The movable basket track beam is arranged on the top deck of the entire transverse bulkhead and its length spans the entire transverse bulkhead section. The basket support frame is slidably mounted on the movable basket track beam. The suspended platform support frame includes a horizontally placed boom and two diagonal braces at one end of the boom. The other end of the boom is connected to the fully movable suspended platform via a sliding rope.

[0015] Furthermore, the dual-sided all-position mobile gantry trolley can be arranged on both sides or on one side, and can be arranged on the transverse bulkhead deck plane or on the outer plating of the hull side.

[0016] Furthermore, in step eight, the painting work includes painting the weld seams of the main assembly and the surface painting of the entire transverse bulkhead section. After the painting is completed, a completion inspection is carried out.

[0017] Furthermore, in step two, the steel structure frame is set in the dock wall area at the end of the dock, utilizing the necessary space for installing the tail shaft, rudder and propeller after the dock is fully assembled, as well as the reserved safety space for the ship to float, drift and leave the dock.

[0018] Furthermore, the transverse bulkhead sections can be vertically assembled independently without the aid of bottom sections and side sections.

[0019] Furthermore, one end of the boom of the all-position movable suspended platform is connected to the eye plate via a steel cable.

[0020] Furthermore, after the vertical gas welding is completed, the painting operation is carried out using a fully movable suspended trolley on both sides.

[0021] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a method for vertically assembling and painting independent transverse bulkhead sections of a ship. It is a construction method that utilizes available space in a dry dock to vertically assemble independent transverse bulkhead sections and simultaneously complete the painting process. This method offers the following specific advantages: (1) Significant reduction in construction site area: Vertical assembly is carried out using the vacant space of the dock wall, which occupies only about 6.67% of the area of ​​horizontal assembly. Taking a 9,000 TEU container ship as an example, the construction site area can be reduced by about 3,500 square meters by assembling in three batches.

[0022] (2) Completely avoid turning operations: The transverse bulkhead sections are assembled in a vertical state, eliminating the need for hoisting, turning and rotation operations, saving the turning lifting code and related additional work, and avoiding the risk of twisting and deformation during the turning process.

[0023] (3) Full utilization of the gantry crane’s hoisting capacity: The main sections after the vertical assembly can be directly hoisted and mounted, and the weight of the main sections can be 2-3 times that of the horizontal assembly.

[0024] (4) Moving the painting process forward to relieve the pressure on the dock: The painting work of the overall assembly weld and the entire section is completed in the overall assembly stage by using the all-position mobile basket trolley on both sides. The painting work is moved forward from before leaving the dock to the overall assembly stage, which effectively reduces the overhead vehicle and painting construction manpower and time resources occupied by the cargo hold painting work before leaving the dock.

[0025] (5) Significantly improved welding efficiency: The vertical assembly, together with the two sides of the all-position mobile trolley, can carry out high-efficiency vertical gas electric welding, which greatly improves the welding efficiency.

[0026] (6) Construction is safe and reliable: The transverse bulkhead sections are fixed by welding at the bottom frame, rigidly fixed to the dock wall, and rigidly connected to each other to form a stable support system. Attached Figure Description

[0027] Figure 1 This is a top view of the H-shaped steel frame of the present invention.

[0028] Figure 2 This is a front view of the H-shaped steel frame of the present invention.

[0029] Figure 3 This is a top view of the vertical assembly frame of the present invention.

[0030] Figure 4 This is a structural schematic diagram of the independent vertical state of the transverse bulkhead section of the present invention.

[0031] Figure 5 This is a schematic diagram of the independent vertical assembly arrangement of the transverse bulkhead sections of the present invention.

[0032] Figure 6 for Figure 5 A schematic diagram of the AA cross-section.

[0033] Figure 7 This is a schematic diagram showing the connection between the top plates of two adjacent transverse bulkheads of the present invention.

[0034] Figure 8 This is a schematic diagram of the vertical gas electric welding construction device according to Embodiment 1 of the present invention.

[0035] Figure 9 This is a schematic diagram of the structure of the all-position movable suspended basket support according to Embodiment 1 of the present invention.

[0036] Figure 10 This is a schematic diagram of the use of a single-sided suspended basket support in different areas according to Embodiment 1 of the present invention.

[0037] in: Vertical assembly frame 1, H-beam steel frame 1.1, transverse bulkhead section 2, passageway tie beam 3, connecting channel steel 4, two-sided all-position movable scaffold trolley 5, all-position movable scaffold support 5.1, lifting rod 5.11, diagonal brace 5.12, movable scaffold track crossbeam 5.13, eye plate 5.2, binding steel rope 5.3, all-position movable scaffold 5.4. Detailed Implementation

[0038] To better understand the technical solution of the present invention, a detailed description will be provided below in conjunction with relevant illustrations. It should be understood that the specific embodiments described below are not intended to limit the specific implementation of the technical solution of the present invention, but are merely possible implementations of the technical solution of the present invention. It should be noted that the descriptions of the positional relationships of the components herein, such as component A being located above component B, are based on the relative positions of the components in the illustrations and are not intended to limit the actual positional relationships of the components.

[0039] See Figure 1-10 , Figure 8 A schematic diagram of the vertical gas welding construction device for the vertical assembly and painting of transverse bulkhead sections according to the present invention is shown. As shown in the figure, the present invention provides a method for the vertical assembly and painting of independent ship transverse bulkhead sections, which employs an independent ship transverse bulkhead section vertical assembly device. This device includes a vertical assembly jig 1, a rigid connection assembly, and a two-sided all-position movable trolley basket device 5.

[0040] The vertical assembly frame 1 is located at the bottom of the dock in the dock wall area at the end of the dock, and consists of multiple parallel H-shaped steel frames 1.1. Each H-shaped steel frame 1.1 is a rectangular frame with multiple sets of stiffening plates on its top surface for engaging with the bottom of the transverse bulkhead section 2. Adjacent H-shaped steel frames 1.1 are rigidly connected as a whole by No. 20 channel steel.

[0041] The rigid connection assembly includes a passageway tie beam 3 and a connecting channel steel 4, which are used to rigidly fix the transverse bulkhead section 2 to the dock wall and to rigidly fix adjacent transverse bulkhead sections 2, and also serve as a passageway.

[0042] The dual-sided all-position movable basket trolley device 5 includes two symmetrically arranged all-position movable basket supports 5.1, eye plates 5.2, and two all-position movable baskets 5.4. The eye plates 5.2 are located at the center of the top deck of the transverse bulkhead section 2.

[0043] Each all-position movable basket support 5.1 includes a basket support frame and a movable basket track beam 5.13. The movable basket track beam 5.13 is arranged on the top of the entire deck. A basket support frame is provided at each of the front and rear ends of the movable basket track beam 5.13. Another basket support frame is also slidably mounted on the movable basket track beam 5.13.

[0044] The suspended platform support frame includes a horizontally placed suspension rod 5.11. Two diagonal braces 5.12 are provided below one end of the suspension rod 5.11 to form a triangular support. The other end of the suspension rod 5.11 is connected to a fully movable suspended platform 5.4 via a sliding rope, allowing the fully movable suspended platform 5.4 to move up and down. The end of the suspension rod 5.11 with the diagonal braces 5.12 is connected to the eye plate 5.2 via a binding steel cable 5.3.

[0045] The length of the moving basket track beam 5.13 covers the width of the entire transverse bulkhead section, allowing the all-position moving basket 5.4 to move along the entire length of the transverse bulkhead section.

[0046] The all-position mobile gantry 5.4 can move up and down and back and forth to achieve full surface coverage construction of the transverse bulkhead section.

[0047] A sliding trolley is provided on the mobile suspended platform track beam 5.13, and the suspended platform support frame is slidably connected to the mobile suspended platform track beam 5.13 through the sliding trolley.

[0048] The dual-sided all-position mobile gantry trolley device 5 can be arranged on both sides or on one side, and can be arranged on the transverse bulkhead deck plane or on the outer plating of the hull side.

[0049] Based on the above-mentioned device, the present invention provides a method for vertical assembly and painting of independent ship transverse bulkhead sections, comprising the following steps: Step one: The transverse bulkheads are divided into sections according to conventional requirements and constructed using conventional processes.

[0050] Step two: In the vacant space near the dock wall inside the dock, a steel structure frame is installed at the bottom of the dock. This assembly area utilizes the vacant space in the dock wall area and does not occupy the dock's main assembly and loading area.

[0051] Step three: First, hoist the steel structure frame onto the transverse bulkhead section in the middle of the span for benchmark positioning, and then begin the vertical assembly construction work.

[0052] Step four: After the benchmark segment positioning is completed, the lower end of the segment is welded and fixed to the steel structure jig. At the same time, the segment is rigidly welded and fixed to the dock wall using No. 20 channel steel and steel structure channel tie beams, which also serve as a passage between the transverse bulkhead section and the land.

[0053] Step 5: Carry out the hoisting, positioning, and connection assembly of the other side transverse bulkhead section. After the other side transverse bulkhead section is connected and fixed to the original reference positioning section, weld and fix the lower end of the section to the steel structure jig.

[0054] Step six: After the positioning, assembly, and connection of the first transverse bulkhead section are completed, the welding of the assembly seam is carried out. The assembly weld is performed using a high-efficiency vertical gas-electric welding method with a fully movable gantry trolley set on both sides of the deck top.

[0055] Step 7: After the overall welding of the first transverse bulkhead section is completed, the mid-span segment of the second transverse bulkhead section is hoisted for positioning, assembly, and rigid welding and fixing of the bottom jig. The top deck of the transverse bulkhead is then welded and fixed to the first transverse bulkhead section using No. 20 channel steel and steel structure passageway tie beams, serving as a passageway.

[0056] Step 8: Proceed with the positioning, assembly, fixing and welding of the subsequent transverse bulkhead sections in sequence. The overall assembly welds are performed using a two-sided all-position movable gantry trolley for efficient vertical gas welding.

[0057] Step nine: After the vertical assembly welding of the transverse bulkhead section is completed, the welding seams and the entire section will be painted using the two-sided, fully movable suspended trolleys located on the top of the deck. The painting process includes multiple steps: applying primer, intermediate coat, and topcoat.

[0058] Step 10: Once the horizontal bulkhead section is loaded onto the dock, remove the No. 20 channel steel used for fixing and the steel structure tie beam used for passageway, and then hoist the horizontal bulkhead section onto the dock in sequence.

[0059] In step two, when multiple transverse bulkhead sections are being constructed simultaneously, several steel structure jigs for the bottom of the transverse bulkheads are fabricated at the same time. These jigs are then rigidly connected together with No. 20 channel steel to form a single integrated steel structure jig.

[0060] In step six, the two-sided all-position movable gantry trolley can be arranged on both sides or on one side. It can be arranged on the plane of the transverse bulkhead deck or on the outer plate of the hull side, and fixed to the outer plate by a bracket with a rotating stud.

[0061] In step nine, the painting work includes painting the weld seams of the main assembly and the surface painting of the entire transverse bulkhead section. After the painting is completed, a completion inspection is carried out.

[0062] Example 1: Vertical assembly and painting of independent transverse bulkhead sections of a 9000TEU dual-fuel container ship; This embodiment 1 relates to a method for vertical assembly and painting of independent transverse bulkhead sections on a ship. Taking a 9000TEU dual-fuel container ship as an example, the ship's cargo hold area has seven transverse bulkheads, and the transverse bulkhead sections are divided into two sections on the port and starboard sides. In this embodiment, three transverse bulkhead sections are used as a batch for vertical assembly construction.

[0063] S1, rack arrangement: Three steel structural frames for the bottom of the transverse bulkheads are installed at the bottom of the dock in the dockside area at the end of the dock. These frames are rigidly connected to each other using No. 20 channel steel to form a single integrated steel structural frame. Each frame consists of a rectangular frame made of H-beams, with the longer side extending along the width of the transverse bulkhead (approximately 5-6 meters), and the total length being 38 meters. The shorter side extends along the length of the transverse bulkhead (approximately 1-2 meters). Due to the presence of beam arches at the bottom of the dock, steel plates are placed at the lower edges of the H-beams to level them.

[0064] S2, Baseline Segment Positioning: For the port side section of the first transverse bulkhead, the steel structure jig was used for benchmark positioning. A total station was used to measure the levelness of the section's bottom opening, adjusting it to a deviation ≤3mm; a laser collimator was used to measure the verticality of the section, adjusting it to a deviation ≤5mm. After positioning, the bottom opening of the section was welded and fixed to the steel structure jig. Simultaneously, the section was rigidly welded and fixed to the dock wall using No. 20 channel steel and steel structure channel tie beams, with a connection every 3m.

[0065] S3, Assembly of the other side section: Hoist the starboard transverse bulkhead section, adjust the butt joint gap (design value 8-12mm) and misalignment (≤2mm) between it and the port section, and weld the lower end of the section to the steel structure jig after positioning to complete the assembly of the first transverse bulkhead section.

[0066] S4. Assembly seam welding and painting: Two fully mobile suspended platform trolleys were installed on the top of the transverse bulkhead deck. The eye plate was welded to the center of the deck, and the left and right side suspended platform supports were connected to the eye plate by steel cables. Construction workers stood inside the suspended platform to perform vertical gas welding, welding symmetrically from the middle outwards.

[0067] After welding is completed, the weld seams are coated using the same suspended trolley. High-pressure airless spraying is used for coating, with pure epoxy primer (dry film thickness 80μm) and wear-resistant pure epoxy cargo warehouse topcoat (dry film thickness 120μm) applied in sequence.

[0068] S5. Subsequent section construction: After the second transverse bulkhead section was hoisted and positioned at mid-span, it was welded and fixed to the first transverse bulkhead section on the top deck using No. 20 channel steel and steel structure passageway tie beams, serving as a passageway. The construction of the three transverse bulkhead sections was completed in sequence.

[0069] S6, equipped with: After the painting inspection is passed, the rigid connecting parts are removed, and the transverse bulkhead sections are hoisted one by one for dock loading.

[0070] Example 2: Vertical assembly and painting of transverse bulkhead sections of a 24,000 TEU ultra-large container ship; This embodiment 2 relates to a method for vertical assembly and painting of independent transverse bulkhead sections of a ship. The difference between this embodiment and embodiment 1 is that the transverse bulkheads are larger and heavier. The transverse bulkheads of a 24,000 TEU container ship are approximately 56m wide and 33m high, divided into three sections: left, center, and right. Each section weighs approximately 80-270 tons and is painted with a wear-resistant pure epoxy cargo hold paint.

[0071] Reinforced tire frame: The main beam of the H-beam steel frame is made of HW400×400 steel, the middle connecting plate is made of HW200×200 steel, the connecting channel steel between adjacent frames is upgraded to No. 25 channel steel, and cross bracing is added to form a space truss structure.

[0072] Segmented hoisting: The 800-ton gantry crane in the dock was used for hoisting. A laser collimator was added during the positioning of the reference section to check the verticality and ensure that the verticality deviation was ≤5mm. The rigid connection between the reference section and the dock wall was increased to one connection every 2m.

[0073] Painting process: Before coating, sandblasting and rust removal were performed to achieve Sa2.5 grade. Pure epoxy primer (dry film thickness 100μm) and wear-resistant pure epoxy warehouse topcoat (dry film thickness 150μm) were applied in sequence; the thickness of each coat was measured with a wet film thickness gauge after each coat, and the total dry film thickness reached 250μm.

[0074] Example 3: Vertical assembly and painting of transverse bulkhead sections of polar vessels; This embodiment 3 applies the present invention to the assembly of transverse bulkhead sections of polar vessels. The transverse bulkheads of polar vessels are made of low-temperature steel, which places special requirements on welding and painting processes. The method in this embodiment 3 differs from that in embodiment 1 in that: Low-temperature welding process: The transverse bulkhead is made of EH36 low-temperature steel. The general assembly seam welding uses special low-temperature steel welding rods. Preheating is not required before welding, but if the ambient temperature is below 5℃, preheating to at least 20℃ is necessary. If the relative humidity is above 80%, preheating is required to remove moisture. The interpass temperature is controlled to ≤150℃. Heating methods include electric heating plates or flame heating. The heating width is at least 50mm on both sides of the bevel. The two sides of the all-position mobile suspended trolley are equipped with insulation felt and heating equipment to ensure the welding ambient temperature is not lower than 5℃.

[0075] Low-temperature coating process: Thick-film pure epoxy coatings are used, and the ambient temperature during application must be maintained above 5℃. When using a suspended trolley for coating operations, a mobile heating device is provided to locally heat the coating area.

[0076] Working principle: This invention provides a method for vertical assembly and painting of independent transverse bulkhead sections of a ship, which works collaboratively based on the following core mechanisms: (1) Independent vertical assembly mechanism: The transverse bulkhead sections are assembled vertically independently in the open space of the dock wall without the aid of bottom sections and side sections. Each transverse bulkhead section is self-contained and is stably supported by bottom jig welding and top rigid connectors.

[0077] (2) All-position mobile suspended platform construction mechanism: An all-position mobile suspended platform trolley is set on each side of the top of the transverse bulkhead deck, which can simultaneously carry out construction on both sides of the overall assembly weld. The suspended platform can move in all positions, including forward, backward, up, down, left, and right, covering the full height range of the weld. This device can be used for both vertical gas electric welding and painting operations, realizing multiple uses of one machine.

[0078] (3) The painting process is moved forward: the painting process is completed during the idle time of the final assembly stage, and the painting process is moved forward from the dock stage to the final assembly stage, which effectively alleviates the pressure of painting operations before leaving the dock.

[0079] (4) Rigid fixing and passage integration mechanism: The No. 20 channel steel and steel structure passage tie beam between the transverse bulkhead section and the dock wall and between the sections serve the dual functions of rigid fixing and personnel passage.

[0080] The above are merely specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. All technical solutions formed by equivalent transformations or substitutions fall within the scope of protection of the present invention.

Claims

1. A method for vertical assembly and painting of independent transverse bulkhead sections of a ship, characterized in that, Includes the following steps: Step 1: The transverse bulkheads were constructed in sections and completed. Step 2: Install a steel structure frame at the bottom of the dock in the open space near the dock wall inside the dock. Step 3: Locate the reference position on the steel structure jig for the transverse bulkhead section in the middle of the span; Step 4: After the benchmark segment positioning is completed, the lower end of the segment is welded and fixed to the steel structure jig. At the same time, the segment is rigidly welded and fixed to the dock wall using rigid connection components. Step 5: Hoist the other side transverse bulkhead sections for positioning and assembly. After the connection is fixed, weld the lower end of the section to the steel structure frame. Step six: Weld the main assembly seam. The main assembly weld seam is constructed using vertical gas-electric welding with a fully movable gantry trolley set on both sides of the top of the deck. Step 7: Sequentially position, assemble, fix and weld the subsequent transverse bulkhead sections, and rigidly fix the transverse bulkhead sections together with rigid connection components; Step 8: After the vertical assembly welding of the transverse bulkhead section is completed, use the two-sided all-position mobile trolley to carry out the assembly weld seam and the painting work of the entire section. Step nine: Remove the rigid connection components and hoist the transverse bulkhead sections one by one for installation.

2. The method for vertical assembly and painting of independent ship transverse bulkhead sections according to claim 1, characterized in that: In step two, when multiple transverse bulkhead sections are being constructed simultaneously, several steel structure jigs for the bottom of the transverse bulkheads are fabricated at the same time, and the jigs are rigidly connected to each other with No. 20 channel steel to form an integral steel structure jig.

3. The method for vertical assembly and painting of independent ship transverse bulkhead sections according to claim 1, characterized in that: In step four, the rigid connection assembly includes a No. 20 channel steel and a steel structure channel tie beam bridge, which, after being rigidly welded and fixed, also serves as a passageway between the transverse bulkhead section and the land.

4. The method for vertical assembly and painting of independent ship transverse bulkhead sections according to claim 1, characterized in that: The two-sided all-position movable basket trolley includes two symmetrically arranged all-position movable basket supports, an eye plate, and two all-position movable baskets. The eye plate is set on the central axis of the top deck of the transverse bulkhead section. The all-position movable basket support includes a basket support frame and a movable basket track beam. The movable basket track beam is arranged on the top of the deck of the entire transverse bulkhead and its length spans the entire transverse bulkhead section. The basket support frame is slidably mounted on the movable basket track beam. The suspended platform support frame includes a horizontally placed boom and two diagonal braces at one end of the boom. The other end of the boom is connected to the fully movable suspended platform via a sliding rope.

5. The method for vertical assembly and painting of independent ship transverse bulkhead sections according to claim 4, characterized in that: The dual-sided all-position mobile gantry trolley can be arranged on both sides or on one side, and can be arranged on the transverse bulkhead deck plane or on the outer plating of the hull side.

6. The method for vertical assembly and painting of independent ship transverse bulkhead sections according to claim 1, characterized in that: In step eight, the painting work includes painting the weld seams of the main assembly and the surface painting of the entire transverse bulkhead section. After the painting is completed, a completion inspection is carried out.

7. The method for vertical assembly and painting of independent ship transverse bulkhead sections according to claim 1, characterized in that: In step two, the steel structure frame is set in the dock wall area at the end of the dock, utilizing the necessary space for installing the tail shaft, rudder and propeller after the dock is fully assembled, as well as the reserved safety space for the ship to float, drift and leave the dock.

8. The method for vertical assembly and painting of independent ship transverse bulkhead sections according to claim 1, characterized in that: The transverse bulkhead sections are assembled vertically independently without the aid of bottom sections and side sections.

9. The method for vertical assembly and painting of independent ship transverse bulkhead sections according to claim 4, characterized in that: The end of the boom of the all-position movable suspended platform is connected to the eye plate by a steel cable.

10. The method for vertical assembly and painting of independent ship transverse bulkhead sections according to claim 1, characterized in that: After the vertical gas welding is completed, the painting operation is carried out using a fully movable suspended trolley on both sides.

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