Mounting structure of marine liquid cargo distribution board and mounting method thereof

Abstract

According to the installation structure of the marine liquid cargo distribution board and the installation method of the installation structure, the installation structure adopts the method that the cable is arranged on the liquid cargo distribution board, and the cable from the liquid cargo distribution board to equipment in a superstructure area can be directly laid in the superstructure area; the cable from the liquid cargo distribution board to the cargo compartment area equipment directly penetrates through the front wall from the main deck to enter the cargo compartment area, and the cable in the cargo compartment area does not need to wait for other areas to pay the remaining cable length, so that all the areas work in parallel, and a large amount of cable length cost and working hours can be saved. In the aspect of base installation, a form of unequal angle steel and a support is adopted, the height of a single foot of an uneven deck is adjusted within a controllable range under the limited base height, a large amount of welding and polishing working hours are reduced, and the construction efficiency is further improved. According to the invention, a conventional liquid cargo distribution board cable entering form is broken, so that the cable laying efficiency is greatly improved, the construction period of electrical operation in a dock is shortened, and the popularization value is extremely high.

Description

Technical Field

[0001] This invention relates to the field of cable laying technology, and in particular to an installation structure and installation method for a marine liquid cargo switchboard. Background Technology

[0002] The cargo control panel and cargo control console are core and crucial equipment on liquefied gas carriers. To facilitate the operation and control of the cargo system in the cargo holds, they are typically located in the main deck and B-deck functional cabin areas near the bow within the superstructure of the liquefied gas carrier. See details... Figure 1 In the past, especially on large liquefied gas carriers such as VLGCs and VLECs, the main power input for liquid cargo switchboards came from the main switchboard in the engine room area, while the control of most of the liquid cargo systems came from equipment in the cargo hold area. The traditional cabling method for liquid cargo switchboards was bottom-entry. This method required a large number of cables to be routed around the engine room area before reaching other areas, wasting significant cable length and creating a sequential workflow between engine room cable laying and superstructure cable laying. In other words, to complete the cabling work for the liquid cargo switchboard, the engine room work area, in addition to completing its own internal cable laying, had to wait for the superstructure and cargo hold areas to finish laying their cables before routing the remaining cable length around the engine room and into the bottom of the liquid cargo switchboard. This prevented the engine room area from achieving complete cabling in advance. This method of laying cables into the liquid cargo switchboard is no longer in line with the pace of modern shipbuilding. Moreover, the cable laying operation of the liquid cargo switchboard of this liquefied gas carrier has become a bottleneck in the construction of liquefied gas carriers, affecting the efficiency of shipbuilding.

[0003] Regarding its base installation, according to the installation process requirements of marine power distribution boards, the flatness requirement for the power distribution board base provided by the shipyard is that the unevenness per meter should not exceed 1mm; the allowable limit for the entire length is not more than 6mm. In reality, due to the hot work and splicing process on ship decks, the flatness cannot meet the requirements for the installation of switchboard bases, resulting in unevenness, especially in the main deck area, which typically has curved height differences. Conventional switchboard bases are constructed by parallel splicing of equal-sided angle steel (L75*75*8) into a frame (due to limitations on switchboard height and operating height, the base height is generally no more than 75mm, and the vertical edges are fully welded to the deck to prevent dust from entering the switchboard). This frame is then laid flat on the deck surface. Because of the uneven deck, the parallel frame type requires leveling with a spirit level or other instruments. After leveling, the outer perimeter must be corrected and fully welded, and the interior requires intermittent welding. Large gaps require extensive welding material to fill them. Then, a lining is poured inside the base, and the switchboard is installed after the lining has solidified. This process not only wastes a significant amount of welding material but also results in very low welding and grinding efficiency, making it difficult to control flatness. To improve the construction efficiency of liquefied gas carriers and the flatness of the switchboard base, we urgently need to consider how to ensure that the cables from the liquefied cargo switchboard in the superstructure area to the liquefied cargo control console on the B deck and to the liquefied cargo system equipment in the cargo hold area are not laid through the engine room area, while saving cable length and improving the flatness of the switchboard. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the present invention provides an installation structure for a marine liquid cargo electrical distribution panel, the installation structure comprising:

[0005] The liquid cargo switchboard is located on the main deck, which is arranged in ascending order as deck A, deck B, deck C, deck D, and bridge deck. Cables from the liquid cargo switchboard to the superstructure area and cables from the liquid cargo switchboard to the cargo hold area pass through watertight penetrations of the equipment located above the liquid cargo switchboard. Cables from the liquid cargo switchboard to the engine room area pass through the bottom of the liquid cargo switchboard.

[0006] The liquid cargo switchboard is fixed to the main deck via a switchboard base. The horizontal bracing of the switchboard base is constructed using unequal-sided angle steel to form the outer frame. The length of the unequal-sided angle steel is arranged along the frame line. The wider side of the unequal-sided angle steel is horizontal, and the narrower side is vertical. Equal-sided angle steel is used as longitudinal support at the four corners of the frame. The length of the equal-sided angle steel is arranged vertically, and the bottom of the equal-sided angle steel is lower than the lower edge of the unequal-sided angle steel. Where the length of the unequal-sided angle steel between two adjacent equal-sided angle steels used as longitudinal supports exceeds a set value, equal-sided angle steel reinforcement is used as longitudinal support. After adjusting the levelness of the entire switchboard base surface, the equal-sided angle steel and the equal-sided angle steel reinforcement are welded to the deck surface.

[0007] Optionally, a certain amount of net space is left between the top of the liquid cargo distribution panel and the hull reinforcement structure below deck A; a pipe rack channel is erected along the front of deck A near the superstructure forward wall and the vertical structure of the cargo hold to provide a channel for cable laying to the cargo hold area.

[0008] Optionally, the value can be set to 1 / 2 of 800mm.

[0009] Optionally, the watertight penetration components of the equipment include a stuffing box and an MCT frame.

[0010] Optionally, when the distribution board base is placed on an uneven or curved deck, the reason for the unevenness of the distribution board mounting base is determined by measuring with a level instrument. If the equilateral angle steel used as longitudinal support encounters a protruding deck, the excess support angle steel is directly cut off. If the equilateral angle steel used as longitudinal support encounters a concave deck, a cover plate is welded onto the support foot to increase the height of the support angle steel.

[0011] Optionally, within the area enclosed by the outer frame of the distribution board base, the space between the lower edge of the narrow side of the unequal angle steel and the deck is filled with sealing material.

[0012] The present invention also provides an installation method for the aforementioned installation structure, comprising the following steps:

[0013] S1. Construction and cable laying of the superstructure area; including:

[0014] S11. According to the drawings, decks A, B, C, D and the bridge deck shall be combined to form the superstructure area.

[0015] S12. According to the drawing requirements, weld the cable tray to the top of deck A, and complete the outfitting of the other cable fixing parts.

[0016] S13. According to the drawings, the cargo control console shall be placed in the cargo control room, which is located on deck B.

[0017] S14. The cable from the liquid cargo distribution board to the superstructure area is laid from the bottom inlet of the cargo control console downward through the space between deck A and deck B, and towards the cable tray at the top of deck A, and the cable is coiled on the cable tray.

[0018] S2. Construction and cable laying of the cargo hold area, including:

[0019] S21. According to the drawing requirements, form the cargo hold area;

[0020] S22. According to the drawing requirements, weld the pipe rack structure to the cargo hold structure on the vertical plane;

[0021] S23. According to the drawing requirements, weld the cable tray to the pipe rack structure, and complete the outfitting of the other cable fixing paths.

[0022] S24. First, lay the cable from the liquid cargo switchboard to the cargo hold area near the relevant equipment in the cargo hold area, and then lay the other end on the cable tray and leave enough slack.

[0023] S3. Cabin area cable laying, including:

[0024] S31. Form the cabin area according to the drawing requirements;

[0025] S32. According to the drawing requirements, complete the electrical outfitting of the corresponding fixed cables from the liquid cargo power distribution board to the engine room area.

[0026] S33. According to the drawings, place the liquid cargo switchboard in the designated position on the main deck;

[0027] S4. According to the drawings, assemble the cargo hold area and engine room area in the dock to form the main hull area.

[0028] Optionally, it also includes step S5, cable laying throughout the ship, specifically including:

[0029] S51. According to the drawings, the superstructure area and the main hull area will be assembled into the whole ship during the dock stage.

[0030] S52. The cable section from the liquid cargo distribution board to the superstructure area that is coiled on the cable tray is laid into the liquid cargo distribution board through the equipment watertight penetration component.

[0031] S53. Pass the cable section from the liquid cargo switchboard to the cargo hold area onto the cable tray and insert it into the front wall of the superstructure, and lay it inside the liquid cargo switchboard.

[0032] Optionally, it also includes the process of sealing the gaps in the space after the distribution board base is installed, including the following steps:

[0033] T1. Install the cable drum and distribution board base in place according to the design drawings.

[0034] T2. Based on the length and width of the perimeter of the distribution board base, make a shielding strip, the length and width of which match the distance of the outer frame of the distribution board mounting base;

[0035] T3. Place the prepared shielding strips around the base of the distribution board and fix them with bolts, nuts or other means to cover the gap between the narrow lower edge of the unequal angle steel and the deck with the shielding strips.

[0036] T4. Pour the dressing contained in the dressing container into the distribution board mounting base, so that the height of the dressing exceeds the lower edge of the narrow side of the unequal angle steel, and the dressing fills the space between the lower edge of the narrow side and the lower edge of the deck formed by the shielding strip.

[0037] T5. After the dressing has solidified, remove the shielding strip to prevent external debris from entering the electrical distribution board that will be installed later.

[0038] As described above, the present invention provides an installation structure and installation method for a marine liquid cargo electrical distribution panel, which has the following beneficial effects:

[0039] Previously, the cable entry method for marine liquid cargo switchboards was bottom entry, requiring cables to the superstructure and cargo hold areas to detour through the engine room area. This resulted in a significant waste of cable length, causing a large accumulation of electrical outfitting components and cables in the engine room area. It also increased the installation difficulty for other outfitting professionals, such as those working on piping and air cooling systems, in this area. Most importantly, the laying of cables related to the liquid cargo switchboard in the engine room work area had to wait until the cables in the superstructure and cargo hold areas (where most of the cable length was located) were laid completely before the cables were pulled to the top entry port of the liquid cargo switchboard, causing delays in the integrity inspection of the engine room.

[0040] The installation structure of this invention adopts a method of cable entry from the liquid cargo switchboard. Cables from the liquid cargo switchboard to equipment in the superstructure area can be laid directly within the superstructure area. Cables from the liquid cargo switchboard to equipment in the cargo hold area pass directly from the main deck through the forward bulkhead into the cargo hold area. Cables in the engine room area do not need to wait for the remaining cable length from other areas, allowing each area to operate in parallel and saving significant cable length costs and labor time. Regarding base installation, conventional marine switchboard installation bases use a flat frame structure made of equilateral angle steel. The sealing method involves directly welding the edges of the angle steel to the deck, then pouring a coating material into the base. After solidification, this forms the A60 deck coating specified by the classification society, aiming to create an A60 fire-resistant zone on the deck below the switchboard area. This flat frame installation base requires full welding of the entire outer perimeter with welding rods. Even when encountering uneven deck surfaces or strip-shaped gaps formed by the base, welding rods must be piled up, wasting significant welding material costs and resulting in very low welding and grinding efficiency, as well as difficulty in controlling flatness. The current method employs unequal angle steel with supports, which not only allows for controlled height adjustment of a single leg on uneven decks within a limited base height, but also significantly reduces welding and grinding time, further improving construction efficiency. This novel method breaks away from conventional cable installation methods for liquid cargo distribution panels, greatly improving cable laying efficiency and reducing the cost of distribution panel installation materials. It also significantly shortens the construction cycle for electrical work in the dock, making it highly valuable for widespread application. Attached Figure Description

[0041] Figure 1 This diagram shows the cable routing of a liquid cargo distribution board in the prior art.

[0042] Figure 2 This is a diagram showing the cable routing of the liquid cargo distribution board.

[0043] Figure 3 Displayed as Figure 2 See view A for details.

[0044] Figure 4 Displayed as Figure 2 Cable laying diagram for the construction area.

[0045] Figure 5 Displayed as Figure 4 A step-by-step diagram of cable laying methods.

[0046] Figure 6 Displayed as Figure 2 A diagram showing the cable laying layout in the cargo hold area.

[0047] Figure 7 Displayed as Figure 6 A step-by-step diagram of cable laying methods.

[0048] Figure 8 Displayed as Figure 2 Cable routing diagram for the cabin area.

[0049] Figure 9 Displayed as Figure 8 A step-by-step diagram of cable laying methods.

[0050] Figure 10 This is a combined map of the cargo hold area and the engine room area.

[0051] Figure 11 Displayed as Figure 10 The merging steps are shown in the diagram.

[0052] Figure 12 This is a combined map of the superstructure area and the main hull area.

[0053] Figure 13 Displayed as Figure 12 A step-by-step diagram of cable laying methods.

[0054] Figure 14 The image shown is a top view of the power distribution board base.

[0055] Figure 15 Displayed as Figure 14 AA view.

[0056] Figure 16 Displayed as Figure 14 BB view.

[0057] Figure 17 Displayed as Figure 14 The CC view.

[0058] Figure 18 Displayed as Figure 14 DD view.

[0059] Figure 19 Displayed as Figure 15 See E view for details.

[0060] Figure 20 Displayed as Figure 16 See view F for details.

[0061] Figure 21 Displayed as a misaligned cut view.

[0062] Figure 22 Displayed as a gap filler view.

[0063] Figure 23 Displayed as a masking bar view.

[0064] Figure 24 Displayed as a view showing the placement of the masking strips.

[0065] Figure 25 Displayed as Figure 24 The GG view.

[0066] Figure 26 Displayed as Figure 24 The HH view.

[0067] Figure 27 The view shown is of the dressing pouring process.

[0068] Figure 28 This is the view after the obscuring strip has been removed.

[0069] Explanation of reference numerals in the attached figures

[0070] 1. Superstructure area; 2. Cargo hold area; 3. Engine room area; 4. Cargo control room; 5. Main hull area; 11. Main deck; 12. A deck; 13. B deck; 14. C deck; 15. D deck; 16. Bridge deck; 17. Superstructure forward bulkhead; 18. Hull reinforcement structure; 19. Pipe rack structure; 20. Cargo hold structure; 21. Liquid cargo switchboard; 22. Cargo control console; 23. Cable from liquid cargo switchboard to superstructure area; 24. Cable from liquid cargo switchboard to cargo hold area; 25. Cable from liquid cargo switchboard to engine room area; 26. Watertight penetration of equipment; 27. Cable tray; 28. Clear space distance; 30. Switchboard base; 31. Deck; 32. Cable drum; 33. Shelter strip; 34. Covering material; 35. Covering material container; 101. Unequal angle steel; 102. Equal angle steel; 103. Equal angle steel reinforcement; 104. Redundant support angle steel; 105. Overlap plate; 1011. Wide side; 1012. Narrow side. Detailed Implementation

[0071] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0072] In the detailed description of embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0073] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for the device in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The phrase “between” as used herein includes both endpoint values.

[0074] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are formed in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0075] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0076] like Figure 2 , Figure 3 As shown, the present invention provides an installation structure for a liquid cargo power distribution board, the installation structure comprising:

[0077] Liquid cargo power distribution panel 21; the liquid cargo power distribution panel 21 is located on the main deck 11, and from the main deck upwards are deck A 12, deck B 13, deck C 14, deck D 15, and bridge deck 16. Deck A 12, deck B 13, deck C 14, deck D 15, and bridge deck 16 constitute the superstructure area.

[0078] The cables 23 from the liquid cargo power distribution board to the superstructure area and the cables 24 from the liquid cargo power distribution board to the cargo hold area pass through the equipment watertight penetration 26 located above the liquid cargo power distribution board. The equipment watertight penetration 26 is located above the liquid cargo power distribution board 21 and its purpose is to prevent air conditioning condensate from dripping into the equipment. The equipment watertight penetration 26 can be a stuffing box or an MCT frame, etc.

[0079] Because the cables 24 from the liquid cargo switchboard to the cargo hold area are relatively thick, a certain amount of clearance 28 must be maintained between the top of the liquid cargo switchboard 21 and the hull reinforcement structure 18 below the A deck 12 in order to achieve a certain bending radius and vertical cable entry distance. A pipe rack channel is constructed along the forward part of the A deck near the superstructure forward bulkhead 17 and the vertical structure 20 of the cargo hold to provide a passage for laying the cables 24 from the liquid cargo switchboard to the cargo hold area. The cables 25 from the liquid cargo switchboard to the engine room area still primarily enter from below the liquid cargo switchboard 21, thus enabling parallel operations.

[0080] The liquid cargo switchboard 21 is fixed to the main deck via the switchboard base 30, such as Figures 14-20 As shown, the cross bracing of the distribution board base 30 is constructed using unequal angle steel 101 to form the outer frame. The length of the unequal angle steel 101 is arranged along the frame line. The wide side 1011 of the unequal angle steel 101 is horizontal, and the narrow side 1012 is vertical. Equal angle steel 102 is used as longitudinal support at the four corners of the frame. The length of the equal angle steel 102 is arranged vertically, and the bottom of the equal angle steel 102 is lower than the lower edge of the unequal angle steel 101, and its height meets the limit height requirement. Where the length of the unequal angle steel 101 between two adjacent equilateral angle steels 102 serving as longitudinal supports exceeds a set value (e.g., half of 800mm), an equilateral angle steel reinforcement 103 is selected as a longitudinal support to reinforce the basic frame of the unequal angle steel 101 supporting the transverse direction. The equilateral angle steel reinforcement 103 is perpendicular to the unequal angle steel 101 to prevent bending after the distribution board equipment is installed, and also to strengthen the support of the entire distribution board mounting base 30. The lower edge of the equilateral angle steel reinforcement 103 is lower than the lower edge of the unequal angle steel 101.

[0081] like Figures 21-22As shown, when the switchboard mounting base 30 is placed on an uneven or curved deck, the cause of the unevenness can be determined using a leveling instrument. If the equilateral angle steel 102, which serves as the longitudinal support, encounters a protruding deck 31, the excess support angle steel 104 can be directly cut off. If the equilateral angle steel 102, which serves as the longitudinal support, encounters a concave deck 31, a cover plate 105 can be welded onto the support foot to increase the height of the support angle steel 102. After the levelness of the entire switchboard mounting base surface is adjusted, the equilateral angle steel 102 and the equilateral angle steel reinforcement 103, which serve as the support angle steel, can be welded to the deck surface. Compared to the previous method of fully welding the angle steel edges around the perimeter, much less grinding and welding is required.

[0082] Furthermore, within the area enclosed by the outer frame of the distribution board base 30, the space between the lower edge of the narrow side and the deck 31 is filled with sealing material, which prevents external dust and other debris from entering the interior of the distribution board after installation.

[0083] Based on the above-described installation structure of the liquid cargo power distribution board, the present invention also provides an installation method, comprising the following steps:

[0084] S1, Cable laying in the above-ground area, such as Figure 4 , Figure 5 As shown, it specifically includes:

[0085] S11. According to the drawing requirements, the structures of deck A 12, deck B 13, deck C 14, deck D 15 and the navigation deck 16 are combined to form superstructure area 1.

[0086] S12. According to the drawing requirements, weld the cable bracket 27 to the top of deck A 12, and complete the outfitting of the other cable fixing parts.

[0087] S13. According to the drawing requirements, the cargo control console 22 is arranged in the cargo control room 5, which is located on deck B 13.

[0088] S14. The cable 23 from the liquid cargo distribution board to the superstructure area passes downward through the bottom inlet of the cargo control console 22, through the space between deck A 12 and deck B, and is laid towards the cable bracket 27 at the top of deck A 12, with the cable looped around the cable bracket 27.

[0089] Next, proceed with step S2, the construction of the cargo hold area and the laying of cables, such as... Figure 6 , Figure 7 As shown, it includes:

[0090] S21. According to the drawing requirements, cargo hold area 2 is formed;

[0091] S22. According to the drawing requirements, weld the pipe rack structure 19 to the cargo hold structure 20 on the vertical plane.

[0092] S23. According to the drawing requirements, the cable tray 27 is welded to the pipe rack structure 19, and the outfitting components for fixing the cables along the remaining paths are completed and in place.

[0093] S24. First, lay the cable 24 from the liquid cargo power distribution board to the cargo hold area near the relevant equipment in the cargo hold area 2, and then lay the other end on the cable tray 27 and make a loop to leave enough slack.

[0094] Next, proceed to step S3, cable laying in the cabin area, such as... Figure 8 , Figure 9 As shown, it includes:

[0095] S31. According to the drawing requirements, form cabin area 3.

[0096] S32. According to the drawing requirements, complete the electrical outfitting of the fixed cable corresponding to the liquid cargo switchboard to the engine room area cable 25.

[0097] S33. According to the drawing requirements, the liquid cargo power distribution board 21 is arranged in the designated position on the main deck 11.

[0098] S34. According to the drawing requirements, the cable 25 to the cabin area is laid to the inlet of the liquid cargo distribution board 21.

[0099] Next, proceed to step S4: according to the drawing requirements, assemble cargo hold area 2 and engine room area 3 in the dry dock, as follows... Figure 10 , Figure 11 As shown, this forms the main hull area 5.

[0100] S5. Cable laying throughout the entire ship, such as Figure 12 , Figure 13 As shown, it includes:

[0101] S51. According to the drawings, the superstructure area 1 and the main hull area 5 will be assembled into the whole ship during the dock stage.

[0102] S52. The section of cable 23 from the liquid cargo distribution board to the superstructure area, which is looped on the cable tray 27, is laid into the liquid cargo distribution board 21 through the equipment watertight penetration member 26.

[0103] S53. The cable 24 section from the liquid cargo switchboard to the cargo hold area, which is coiled on the cable tray 27, is threaded into the superstructure front wall 17 and laid inside the liquid cargo switchboard 21. This completes the cable laying for the relevant liquid cargo switchboard 21.

[0104] Furthermore, it also includes methods for sealing the gaps in the space after the distribution board base is installed, such as... Figures 23 to 28 As shown, it includes the following steps:

[0105] T1. According to the design drawings, the cable cylinder 32 and the distribution board base 30 are installed in place.

[0106] T2. Based on the length and width of the perimeter of the distribution board base 30, a shielding strip 33 is made. The shielding strip 33 can be made of wood or iron, etc., and its length and width match the distance of the outer frame of the distribution board mounting base 30.

[0107] T3. Place the prepared shielding strips 33 around the base of the distribution board 30. They can be fixed with bolts, nuts or other means. The gap between the narrow lower edge of the unequal angle steel 101 and the deck is shielded by the shielding strips 33.

[0108] T4. The dressing 34 contained in the dressing container 35 is poured into the distribution board mounting base 30, so that the height of the dressing 34 exceeds the lower edge of the narrow side of the unequal angle steel 101, that is, the dressing 34 fills the space between the lower edge of the narrow side and the lower edge of the deck 31 enclosed by the shielding strip 33.

[0109] T5. After the dressing 34 has solidified, remove the shielding strip 33. This will prevent external dust and other debris from entering the distribution board that will be installed later.

[0110] In summary, this invention provides an installation structure and method for a marine liquid cargo switchboard. This installation structure utilizes a cable entry method from the liquid cargo switchboard. Cables from the liquid cargo switchboard to equipment in the superstructure area can be laid directly within the superstructure area. Cables from the liquid cargo switchboard to equipment in the cargo hold area pass directly from the main deck through the forward bulkhead into the cargo hold area. Cables in the engine room area do not need to wait for additional cable lengths from other areas, allowing each area to operate in parallel and saving significant cable length costs and labor time. Regarding the base installation, conventional marine switchboard installation bases use equilateral angle steel to form a flat frame. The sealing method involves directly welding the surrounding angle steel edges to the deck, then pouring a coating into the base. After solidification, this forms the A60 deck coating specified by the classification society, aiming to create an A60 fire-resistant zone on the deck below the switchboard area. This type of flat-frame installation base requires full welding of the entire outer perimeter with welding rods. When encountering uneven deck surfaces or the strip-shaped gaps formed by the base, welding rods must be piled up, resulting in significant waste of welding materials, extremely low welding and grinding efficiency, and difficulty in controlling flatness. The current method, using unequal angle steel with supports, not only allows for controllable height adjustment of a single leg on uneven deck surfaces within a limited base height, but also significantly reduces welding and grinding time, further improving construction efficiency. This novel method breaks away from conventional liquid cargo switchboard cable installation methods, greatly improving cable laying efficiency and reducing switchboard installation material costs. It can significantly shorten the construction cycle of electrical work in the dock, making it highly valuable for widespread application.

[0111] The installation method of this invention can overcome the shortcomings of liquefied gas carriers in efficient construction. This method changes the serial operation of laying the main cable of the liquid cargo switchboard to a parallel operation (i.e., the main cable operation involves the superstructure area cables and the engine room area cables), saving a lot of cables. The entire electrical construction cycle can be significantly shortened, and the cycle of electrical commissioning operations in the subsequent mooring stage is also shortened. It also allows the liquid cargo switchboard installation base to maintain controllable flatness within a limited height, greatly reducing the amount of welding and grinding (reducing the amount of welding materials used), improving construction efficiency. The corresponding new sealing method can also prevent dust from entering the switchboard during the construction process. It not only shortens the construction cycle but also improves the construction quality, making it highly valuable for promotion. The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An installation structure for a marine liquid cargo electrical distribution panel, characterized in that, The mounting structure includes: The liquid cargo switchboard is located on the main deck, which is arranged in ascending order as deck A, deck B, deck C, deck D, and bridge deck. Cables from the liquid cargo switchboard to the superstructure area and cables from the liquid cargo switchboard to the cargo hold area pass through watertight penetrations of the equipment located above the liquid cargo switchboard. Cables from the liquid cargo switchboard to the engine room area pass through the bottom of the liquid cargo switchboard. The liquid cargo switchboard is fixed to the main deck via a switchboard base. The horizontal bracing of the switchboard base is constructed using unequal-sided angle steel to form the outer frame. The length of the unequal-sided angle steel is arranged along the frame line. The wider side of the unequal-sided angle steel is horizontal, and the narrower side is vertical. Equal-sided angle steel is used as longitudinal support at the four corners of the frame. The length of the equal-sided angle steel is arranged vertically, and the bottom of the equal-sided angle steel is lower than the lower edge of the unequal-sided angle steel. Where the length of the unequal-sided angle steel between two adjacent equal-sided angle steels used as longitudinal supports exceeds a set value, equal-sided angle steel reinforcement is used as longitudinal support. After adjusting the levelness of the entire switchboard base surface, the equal-sided angle steel and the equal-sided angle steel reinforcement are welded to the deck surface.

2. The installation structure of the marine liquid cargo switchboard according to claim 1, characterized in that: A certain amount of net space is left between the top of the liquid cargo distribution panel and the hull reinforcement structure below deck A; a pipe rack channel is erected along the front of deck A near the superstructure forward wall and the vertical structure of the cargo hold to provide a channel for cable laying to the cargo hold area.

3. The installation structure of the marine liquid cargo switchboard according to claim 1, characterized in that: The value is set to 1 / 2 of 800mm.

4. The installation structure of the marine liquid cargo switchboard according to claim 1, characterized in that: The watertight penetration components of the equipment include stuffing boxes and MCT frames.

5. The installation structure of the marine liquid cargo switchboard according to claim 1, characterized in that: When the distribution board base is placed on an uneven or curved deck, the reason for the unevenness of the distribution board mounting base is determined by measuring with a level instrument. If the equilateral angle steel used as longitudinal support encounters a protruding deck, the excess support angle steel is directly cut off. If the equilateral angle steel used as longitudinal support encounters a concave deck, a cover plate is welded to the support foot to increase the height of the support angle steel.

6. The installation structure of the marine liquid cargo switchboard according to claim 1, characterized in that: Within the area enclosed by the outer frame of the distribution board base, the space between the lower edge of the narrow side of the unequal angle steel and the deck is filled with sealing material.

7. An installation method for the installation structure as described in any one of claims 1-6, characterized in that, Includes the following steps: S1, Construction and cable laying of the superstructure area; include: S11. According to the drawings, decks A, B, C, D and the bridge deck shall be combined to form the superstructure area. S12. According to the drawing requirements, weld the cable tray to the top of deck A, and complete the outfitting of the other cable fixing parts. S13. According to the drawings, the cargo control console shall be placed in the cargo control room, which is located on deck B. S14. The cable from the liquid cargo distribution board to the superstructure area is laid from the bottom inlet of the cargo control console downward through the space between deck A and deck B, and towards the cable tray at the top of deck A, and the cable is coiled on the cable tray. S2. Construction and cable laying of the cargo hold area, including: S21. According to the drawing requirements, form the cargo hold area; S22. According to the drawing requirements, weld the pipe rack structure to the cargo hold structure on the vertical plane; S23. According to the drawing requirements, weld the cable tray to the pipe rack structure, and complete the outfitting of the other cable fixing paths. S24. First, lay the cable from the liquid cargo switchboard to the cargo hold area near the relevant equipment in the cargo hold area, and then lay the other end on the cable tray and leave enough slack. S3. Cabin area cable laying, including: S31. Form the cabin area according to the drawing requirements; S32. According to the drawing requirements, complete the electrical outfitting of the corresponding fixed cables from the liquid cargo power distribution board to the engine room area. S33. According to the drawings, place the liquid cargo switchboard in the designated position on the main deck; S4. According to the drawings, assemble the cargo hold area and engine room area in the dock to form the main hull area.

8. The installation method according to claim 7, characterized in that, It also includes step S5, cable laying throughout the ship, specifically including: S51. According to the drawings, the superstructure area and the main hull area will be assembled into the whole ship during the dock stage. S52. The cable section from the liquid cargo distribution board to the superstructure area that is coiled on the cable tray is laid into the liquid cargo distribution board through the equipment watertight penetration component. S53. Pass the cable section from the liquid cargo switchboard to the cargo hold area onto the cable tray and insert it into the front wall of the superstructure, and lay it inside the liquid cargo switchboard.

9. The installation method according to claim 8, characterized in that, It also includes the process of sealing the gaps in the space after the distribution board base is installed, including the following steps: T1. Install the cable drum and distribution board base in place according to the design drawings. T2. Based on the length and width of the perimeter of the distribution board base, make a shielding strip, the length and width of which match the distance of the outer frame of the distribution board mounting base; T3. Place the prepared shielding strips around the base of the distribution board and fix them with bolts, nuts or other means to cover the gap between the narrow lower edge of the unequal angle steel and the deck with the shielding strips. T4. Pour the dressing contained in the dressing container into the distribution board mounting base, so that the height of the dressing exceeds the lower edge of the narrow side of the unequal angle steel, and the dressing fills the space between the lower edge of the narrow side and the lower edge of the deck formed by the shielding strip. T5. After the dressing has solidified, remove the shielding strip to prevent external debris from entering the electrical distribution board that will be installed later.

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