A method for dividing and loading cargo hold areas of an LNG bunkering ship

Abstract

The present invention discloses a method for dividing and loading the cargo hold area of ​​an LNG bunkering ship into sections. The method divides the cargo hold area structure into a plurality of ring sections along the length of the ship, and divides each ring section into a bottom section, a bilge section, a side section, a sheer section, and a deck section. At the same time, the upper cabin body of the transverse bulkhead is divided into a deck section and a sheer section, respectively, the left and right cabin bodies are divided into a side section and a bilge section, respectively, and the remaining middle cabin body is divided into an independent transverse bulkhead section. In this way, the large joints between the sections can avoid being directly above the B-type tank, that is, avoiding the B-type tank, thereby greatly reducing the risks of accidental fire and object collision in the insulation layer of the B-type tank, thereby ensuring the smooth construction of the ship.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and in particular to a method for segmenting and loading cargo hold areas of an LNG bunkering ship. Background Art

[0002] LNG (Type B tank) bunkering vessels are different from traditional membrane-type LNG bunkering vessels. Their LNG cargo tanks are Type B storage tanks independent of the ship's hull, and their insulation layers are applied to the outer surface of the Type B tanks. Due to the flammable and fragile nature of the insulation layer, the extensive cutting, welding, and object handling operations during dock construction can easily lead to fire or collision damage to the insulation layer. Therefore, ensuring the fire and collision resistance of the Type B tanks after installation is crucial to the successful construction of the vessel. Summary of the Invention

[0003] In view of this, the present invention provides a method for segmenting and loading cargo hold areas of an LNG bunkering ship, so as to solve the problems existing in the above-mentioned background technology.

[0004] A method for dividing and loading cargo tank areas of an LNG bunkering ship, wherein the liquid cargo tanks provided in the LNG bunkering ship are independent B-type liquid cargo tanks.

[0005] The method specifically comprises the following steps:

[0006] S1, segment division:

[0007] The cargo hold area structure is divided into multiple ring sections along the length of the ship, wherein the ring seam at the fore end of the cargo hold is set in the bow area, the ring seam at the stern end of the cargo hold is set at the stern of the front wall of the engine room, and the ring seam between adjacent sections is set near the transverse bulkhead;

[0008] Each ring segment is divided into a bottom section, a bilge section, a side section, a sheer section, a deck section and a transverse bulkhead section according to its typical cross section. The hull transverse bulkhead is divided into upper and lower bulkhead hulls by the first transverse fault line. The upper bulkhead hull is split downward along the longitudinal large seam of the deck, so that the hull facing the side is divided into the sheer section and the hull facing the middle is divided into the deck section. The lower bulkhead hull is split along the longitudinal fault line and the second transverse fault line, so that the hull facing the side between the first transverse fault line and the second transverse fault line is divided into the side section, the hull facing the side below the second transverse fault line is divided into the bilge section, and the remaining hull facing the middle is divided into the transverse bulkhead section.

[0009] The first transverse break seam is flush with the inner longitudinal wall turning round plate seam at the W3 node, the second transverse break seam is flush with the inner longitudinal wall turning round plate seam at the W2 node, and the longitudinal break seam is set at a position that is offset from the large seam between the bottom section and the bilge section by one longitudinal bone spacing;

[0010] S2, segmented loading:

[0011] The bottom section, bilge section and transverse bulkhead section are combined into a bottom section, the sheer section and deck section are combined into a deck section, and the side section is taken as a side section alone;

[0012] Then, the side section is hoisted and mounted on both sides of the bottom section, and then the independent B-type liquid cargo tank is hoisted into the tank. After the B-type liquid cargo tank is installed, the deck section is mounted on the side section.

[0013] Preferably, the large joint between the bottom segment and the bilge segment is provided at the first longitudinal bone outward of the bottom support seat so as to completely draw the bottom support part on the double bottom of the cargo hold into the bottom segment.

[0014] Preferably, the major seam between the bilge segment and the side segment is flush with the seam line where the inner longitudinal wall turns into the circular plate at the W2 node, and the major seam between the side segment and the sheer top segment is flush with the seam line where the inner longitudinal wall turns into the circular plate at the W3 node.

[0015] Preferably, the longitudinal large joint of the deck between the sheer section and the deck section is arranged near the deck kink point.

[0016] Preferably, the deck segment does not include the coaming structure located around the large dome opening on the deck surface, and the coaming structure located around the large dome opening on the deck surface is bulk-assembled on the deck segment during the dock loading stage.

[0017] Preferably, the sheer section comprises the entire topside tank structure.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention divides the structure of the cargo hold area into several annular sections, and arranges the annular seam at the bow end of the cargo hold in the bow area, the annular seam at the stern end of the cargo hold at the stern of the front wall of the cabin, and the annular seam between adjacent sections near the transverse bulkhead, which can ensure that the cargo hold is loaded and formed first.

[0020] 2. By dividing each ring segment into a bottom segment, a bilge segment, a side segment, a sheer segment, and a deck segment, and at the same time dividing the upper cabin of the transverse bulkhead into the deck segment and the sheer segment respectively, dividing the left and right cabins into the side segment and the bilge segment respectively, and dividing the remaining middle cabin into an independent transverse bulkhead segment, the large joints between the segments can be avoided directly above the B-type tank, that is, avoiding the B-type tank, thereby greatly reducing the risk of accidental fire and object collision of the insulation layer of the B-type tank, and ensuring the smooth construction of the ship; at the same time, the loading process of the present invention is: full-width bottom section → side section → B-type tank → full-width deck section, so that the B-type tank can be hoisted after loading and forming below the second deck of the cargo hold, and the workload of welding large seams of the hull after the B-type tank is hoisted onto the ship is minimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 Side view of the cargo hold area of ​​an LNG bunkering vessel divided into sections.

[0023] Figure 2 Schematic diagram of the key nodes of the cargo hold area cross section.

[0024] Figure 3 Schematic diagram of the cross section of the cargo hold area without transverse bulkheads.

[0025] Figure 4 Schematic diagram of the cross section of the cargo hold area with transverse bulkheads.

[0026] Figure 5 A top view of the cargo hold area of ​​an LNG bunkering vessel divided into sections.

[0027] Figure 6 A top view of the cargo hold area of ​​an LNG bunkering vessel divided into sections.

[0028] Figure 7 This is a schematic diagram of the section loading without transverse bulkhead sections.

[0029] Figure 8 This is a schematic diagram of the section loading with transverse bulkhead sections.

[0030] The meanings of the numbers in the figure are:

[0031] 1 is the cargo hold area, 2 is the bottom section, 3 is the bilge section, 4 is the side section, 5 is the sheer section, 6 is the deck section, 7 is the transverse bulkhead section, 8 is the bottom support seat, 9 is the large joint between the bottom section and the bilge section, 10 is the large joint between the bilge section and the side section, 11 is the large joint between the side section and the sheer section, 12 is the large longitudinal deck joint between the sheer section and the deck section, 13 is the deck, 14 is the double bottom, 15 is the first transverse break line, 16 is the second transverse break line, 17 is the longitudinal break line, 18 is the type B liquid cargo tank, 19 is the bottom section, 20 is the side section, and 21 is the deck section. DETAILED DESCRIPTION

[0032] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] It should be understood that the embodiments described are only a portion of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] The present application is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0035] In the description of this application, unless otherwise expressly specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] In the description of this specification, it should be understood that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described from the perspectives shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0037] The present invention provides a method for dividing and loading the cargo hold area of ​​an LNG bunkering ship into sections. This method not only makes section manufacturing faster and more efficient, and the overall section division more scientific and reasonable, effectively improving the integrity of section pre-assembly; it also can reduce the welding workload of the large seams of the hull after the B-type tank is hoisted to a minimum, and the large seams avoid being directly above the B-type tank, which greatly reduces the risk of accidental fire and object collision in the insulation layer of the B-type tank, thereby ensuring the smooth construction of the ship.

[0038] The liquid cargo tanks provided in the LNG bunkering ship are independent Type B liquid cargo tanks.

[0039] The present invention provides a method for segmenting and loading cargo hold areas of an LNG bunkering ship, which specifically includes the following steps:

[0040] S1, segment division:

[0041] The cargo hold area 1 structure is divided into multiple ring sections along the length of the ship. The fore-end annular seam is located within the bow area, the aft-end annular seam is located aft of the engine room forward wall, and the annular seam between adjacent sections is located near the transverse bulkhead. The specific number of ring sections into which the cargo hold area 1 structure is divided depends on factors such as the shipyard's production facility capabilities and manufacturing process methods.

[0042] Then, each ring segment is divided into a bottom segment 2, a bilge segment 3, a side segment 4, a sheer segment 5, a deck segment 6 and a transverse bulkhead segment 7 according to its typical cross section.

[0043] The large joint 9 between the bottom segment and the bilge segment is arranged at the first longitudinal bone facing outward from the bottom support seat 8 so as to completely incorporate the bottom support seat 8 on the double bottom of the cargo hold into the bottom segment 2. In this way, not only can the bottom support seat 8 be pre-installed on the segment during the segment construction stage to improve the construction efficiency of the segment, but also the construction accuracy can be controlled to meet the requirements of segment pre-installation and accuracy control of the bottom support seat.

[0044] The major seam 10 between the bilge and side sections is the inner longitudinal wall circular plate-to-plate seam at the W2 node, located above the platform at this location. The outer plating and ribs at this location are flush with the first transverse seam line. In the bilge section 3 division, all key hull nodes W1 and W2 are included within this segment. This not only improves the installation accuracy of these key nodes, but also reduces the construction difficulty and welding workload during the docking phase.

[0045] The major seam 11 between the side and sheer sections is the inner longitudinal wall circular plate seam at the W3 node, located above the platform at this location. The major seam 11 between the side and sheer sections is flush with the second transverse seam line. In the sheer section 4 division, the W3 node is included in this section to reduce construction difficulty during the dock construction phase.

[0046] The longitudinal large deck joint 12 between the sheer section and the deck section is arranged near the kink point of the deck 13. Preferably, the longitudinal large deck joint 12 between the sheer section and the deck section is arranged at a position 500 mm away from the kink point of the deck 13.

[0047] In the division of the sheer section 5, the entire topside tank structure is completely divided into the interior of the section, that is, the sheer section 5 includes the entire topside tank structure.

[0048] In the division of deck section 6, in order to ensure the smooth docking and loading of the deck section, the coaming structure around the large dome opening on the deck surface needs to be left for bulk loading after docking, that is, the divided deck section does not include the coaming structure around the large dome opening on the deck surface; at the same time, the large deck opening at the dome is completely included in the section, so as to avoid crossing the large joint.

[0049] The hull transverse bulkhead is divided into upper and lower bulkhead hulls by the first transverse fault line 15. The upper bulkhead hull is split downward along the longitudinal large seam 12 of the deck, so that the hull facing the side is divided into the sheer section 5, and the hull facing the middle is divided into the deck section 6. The lower bulkhead hull is split along the longitudinal fault line 16, so that the hull facing the side between the first transverse fault line 15 and the second transverse fault line 16 is divided into the side section 4, the hull facing the side below the second transverse fault line 16 is divided into the bilge section 3, and the remaining hull facing the middle is divided into the transverse bulkhead section 7.

[0050] The first transverse fracture line 15 is flush with the inner longitudinal wall circular plate seam line at the W3 node.

[0051] The second transverse fracture line 16 is flush with the inner longitudinal wall circular plate seam line at the W2 node.

[0052] The longitudinal seam line 17 is arranged at a position which is offset from the large seam 9 between the bottom segment and the bilge segment by one longitudinal bone spacing, that is, arranged at one longitudinal bone spacing in the middle of the large seam of the double bottom.

[0053] S2, segmented loading:

[0054] The bottom section 2, bilge section 3 and bulkhead section 7 are assembled into a bottom section, the sheer section 5 and deck section 6 are assembled into a deck section, and the side section 4 is separately used as a side section;

[0055] Then, the side section is hoisted and mounted on both sides of the bottom section, and then the independent B-type liquid cargo tank 18 is hoisted into the cabin. After the B-type liquid cargo tank 18 is installed, the deck section is mounted on the side section.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for segmenting and loading cargo hold areas of an LNG bunkering ship, characterized in that: The liquid cargo tanks installed in the LNG bunkering ship are independent Type B liquid cargo tanks. The method specifically comprises the following steps: S1, segment division: The cargo hold area structure is divided into multiple ring sections along the length of the ship, wherein the ring seam at the fore end of the cargo hold is set in the bow area, the ring seam at the stern end of the cargo hold is set at the stern of the front wall of the engine room, and the ring seam between adjacent sections is set near the transverse bulkhead; Each ring segment is divided into a bottom section, a bilge section, a side section, a sheer section, a deck section and a transverse bulkhead section according to its typical cross section. The hull transverse bulkhead is divided into upper and lower bulkhead hulls by the first transverse fault line. The upper bulkhead hull is split downward along the longitudinal large seam of the deck, so that the hull facing the side is divided into the sheer section and the hull facing the middle is divided into the deck section. The lower bulkhead hull is split along the longitudinal fault line and the second transverse fault line, so that the hull facing the side between the first transverse fault line and the second transverse fault line is divided into the side section, the hull facing the side below the second transverse fault line is divided into the bilge section, and the remaining hull facing the middle is divided into the transverse bulkhead section. The first transverse break seam is flush with the inner longitudinal wall turning round plate seam at the W3 node, the second transverse break seam is flush with the inner longitudinal wall turning round plate seam at the W2 node, and the longitudinal break seam is set at a position that is offset from the large seam between the bottom section and the bilge section by one longitudinal bone spacing; S2, segmented loading: The bottom section, bilge section and transverse bulkhead section are combined into a bottom section, the sheer section and deck section are combined into a deck section, and the side section is taken as a side section alone; Then, the side section is hoisted and mounted on both sides of the bottom section, and then the independent B-type liquid cargo tank is hoisted into the tank. After the B-type liquid cargo tank is installed, the deck section is mounted on the side section.

2. The method for segmenting and loading cargo hold areas of an LNG bunkering ship according to claim 1, characterized in that: The large joint between the bottom section and the bilge section is arranged at the first longitudinal bone outward of the bottom support seat so as to completely divide the bottom support part on the double bottom of the cargo hold into the bottom section.

3. The method for segmenting and loading cargo hold areas of an LNG bunkering ship according to claim 1, characterized in that: The major seam between the bilge section and the side section is the seam where the inner longitudinal wall turns into a circular plate at the W2 node, and the major seam between the side section and the sheer top section is the seam where the inner longitudinal wall turns into a circular plate at the W3 node.

4. The method for segmenting and loading cargo hold areas of an LNG bunkering ship according to claim 1, characterized in that: The longitudinal large joint of the deck between the sheer section and the deck section is arranged near the deck kink point.

5. The method for segmenting and loading cargo hold areas of an LNG bunkering ship according to claim 1, characterized in that: The deck segments do not include the coaming structures on the deck surface surrounding the large dome opening. The coaming structures on the deck surface surrounding the large dome opening are bulked on the deck segments during the dock loading phase.

6. The method for segmenting and loading cargo hold areas of an LNG bunkering ship according to claim 1, characterized in that: The sheer section includes the entire topside tank structure.

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