CN113895586A - Segmentation division method for cargo hold area of film type LNG ship - Google Patents
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- 230000011218 segmentation Effects 0.000 title claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 239000010408 film Substances 0.000 claims description 18
- 238000013461 design Methods 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 239000010409 thin film Substances 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 15
- 238000003466 welding Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 2
- 239000003973 paint Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 13
- 238000005452 bending Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
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- 238000005096 rolling process Methods 0.000 description 3
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- 239000000725 suspension Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
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Abstract
The invention discloses a segmentation division method for a cargo hold area of a film type LNG ship, which comprises the following steps: 1) dividing all key nodes W1-W5 on the wall of the cargo hold into sections; 2) arranging a large seam between two cargo areas in a cofferdam; 3) each transverse bulkhead is independently divided; 4) the liquid dome area is divided into independent segments. The segmentation division method is more scientific and reasonable, greatly reduces the labor intensity, has good implementation effect, not only ensures the construction precision of the hold capacity of the cargo hold area and the structural centering precision of key nodes, but also reduces the carrying and hoisting of the dock, reduces the welding workload and the paint damage amount of large joints of the dock, maximally realizes the forward movement of the outfitting work of the dock and the wharf, improves the integrity of ship launching water, and further shortens the dock period.
Description
Technical Field
The invention relates to ship construction, in particular to a segmentation division method for a cargo hold area of a film type LNG ship.
Background
In the cargo area segmentation of the existing film type LNG ship, key nodes of an inner shell wall except W4 are divided into large joints of a dock, and the rest of W1, W2, W3 and W5 are divided into large joints of the dock; on dividing along the ship length direction, all horizontal big seams (circumferential seams) are arranged in the cargo hold area, and the existing segmentation dividing mode has the following defects and shortcomings:
1. because the key nodes W1, W2, W3 and W5 are formed after the dock is carried, the precision control requirement in the stage of carrying the dock is high, the assembling and welding workload is large, the welding quality is not easy to guarantee, the welding deformation is large, and the like. It is disadvantageous to shorten the dock construction period and to improve the dock construction efficiency.
2. All the circular seams are uniformly distributed in the cargo hold area, and the accuracy control of the flatness of the inner shell wall of the cargo hold area is very unfavorable due to deviation caused by hoisting positioning accuracy, welding deformation and the like; because no transverse bulkhead is used as a support, the deck section and the gunwale top section above the cargo compartment area must be subjected to full-width total assembly and then can be docked for carrying, the W3 node is the dock closure node of the total section, through the real ship construction precision measurement data feedback, the precision deviation of the W3 node is large, the assembly welding rework workload in the dock stage is large, the labor and the time are wasted, and the ship construction quality and period are also influenced.
Disclosure of Invention
The invention provides a sectional division method for a cargo hold area of a thin-film LNG ship, which is characterized in that the design form of key nodes of the cargo hold area is optimized, and the design of the sectional division mode is carried out on the cargo hold area by combining the goals of forward working movement of a cargo containment system (CCS for short), launching integrity requirement and the like, so that the high efficiency of ship construction is ensured, the construction quality is improved, and meanwhile, the dock construction period and the wharf construction period are shortened.
In order to achieve the above purpose, the invention provides the following technical scheme;
a segmentation dividing method for a cargo hold area of a film type LNG ship is characterized in that the segmentation dividing method divides the cargo hold area into a bottom segment, a bilge segment, a side segment, a top segment, a deck segment, a transverse bulkhead segment and a liquid dome segment, and specifically comprises the following steps:
the method comprises the first step of carrying out segmentation division along the cross section of a cargo hold area and aiming at a film type LNG ship
The cargo hold area is in an octahedral structure form, a dividing mode that one surface is a segment is adopted, eight inner shell surfaces are divided into 8 typical segment types, a bottom segment, a bilge segment, a broadside segment and a deck segment are sequentially arranged from bottom to top from two sides, the bottom segment and the deck segment do not contain key nodes, and the rest segments contain 1 or 2 key nodes, so that the key nodes W1-W5 are guaranteed to be divided into the segments;
secondly, carrying out segmentation division along the length direction of the ship, namely longitudinally, wherein the film type LNG ship is designed into 4 cabins, except the 1# cabin, the cabin volumes of the 2# cabin and the 4# cabin are the same, the 1# cargo cabin is divided into 2 ring segments during the length division, the 2# cabin and the 4# cabin adopt the same plate length specification, each cabin segment is longitudinally divided into 3 ring segments, a circular seam between the two cabin segments is arranged in a transverse compartment, and a large seam of a bottom segment/a bilge segment is arranged in a large cabin on the front wall of the transverse compartment;
thirdly, independently dividing a liquid dome area on a trap deck into independent sections;
and fourthly, dividing the cofferdam into sections by adopting an independent division mode, integrating the sections under the condition that the hoisting capacity is met, ensuring the high-precision requirement of the cargo containment system on the flatness of the cofferdam, and simultaneously laying a foundation for preassembling the insulation box base on the cofferdam total section.
In the method for segmenting and dividing the cargo hold area of the thin film type LNG ship, the design forms of W2, W3 and W5 nodes in key nodes are optimized in the first step, inner shell walls at the nodes are in the form of arc plates, the broken line size of the inner shell walls at the nodes is controlled within a reasonable range, and the size control meeting the preassembling requirement of an insulation box base of a cargo containment system is in the reasonable range.
In the method for segmenting and dividing the cargo hold area of the film type LNG ship, the first step is to scratch W1 and W2 nodes in key nodes into bilge parts, the W1 node is in a trihedral welding design form, the width of the broken line position of an inner bottom plate needs to be larger than 1000mm, the W2 node adopts an arc plate connection form, the broken line position of the arc plate of the inner shell at the node needs to be determined after comprehensive consideration is carried out on the height of a jig frame in the horizontal manufacturing process by combining the plate thickness distribution condition, the cold bending working condition parameters of processing equipment, precision control, lifting and the inner slope as a base plane, wherein the height range h of the jig frame is 800-1000 mm. In the practical planning, the position of the inner shell arc plate row plate seam at the W2 node is optimized and adjusted by a design department through selecting the wide size range of the inner shell plate which can meet the requirements of cold processing, precision, turning and a jig frame, and finally the position 500mm above the W2 node is set as the large seam position of the inner shell plate.
In the method for segmenting and dividing the cargo hold area of the film type LNG ship, a W3 node is segmented into the side sections, and the broken line position of an inner shell arc plate at the node is determined by comprehensively considering the height of a jig frame during lateral manufacturing by taking a longitudinal wall as a base surface, according to the plate thickness distribution condition, the cold bending working condition parameters of processing equipment, precision control, lifting and turning over, wherein the height range h of the jig frame is 800-1000 mm. In the practical planning, the position of the inner shell arc plate row plate seam at the W3 node is optimized and adjusted by a design department through selecting the wide size range of the inner shell plate which can meet the requirements of cold processing, precision, turning and a jig frame, and finally the position 300mm above the W3 node is set as the large seam position of the inner shell plate.
In the method for segmenting and dividing the cargo hold area of the film type LNG ship, a W5 node is segmented into the shipboard top segment, and the broken line position of the inner shell arc plate at the node is determined by comprehensively considering the height of a jig frame during lateral manufacturing by taking an oblique side as a base plane in combination with the plate thickness distribution condition, the cold bending working condition parameters of processing equipment, precision control, lifting and turning over. In the practical planning, the position of the inner shell arc plate row plate seam at the W5 node is optimized and adjusted by a design department through selecting the wide size range of the inner shell plate which can meet the requirements of cold processing, precision, turning and a jig frame, and finally the position of the middle 1600mm of the W5 node is set as the large seam position of the inner shell plate.
In the method for segmenting and dividing the cargo area of the film type LNG ship, in the second step, the circular seam of the bottom segment and the bilge segment is moved forwards to the large cabin from the inside of the transverse bulkhead, the distance between the circular seam and the large cabin is more than 1000mm, and the circular seam needs to avoid the position of a pump tower base on the inner bottom plate.
In the method for segmenting and dividing the cargo hold area of the film type LNG ship, in the second step, the cargo hold is longitudinally divided into 3 circular seams, the length of each segment is preferably 18-20 m, and all the circular seams are required to avoid liquid domes, gas domes and side large-cabin process holes.
In the third step, the liquid dome area on the deck of the enclosure well is the inlet of a liquid cargo tank pump tower which is hung into a cabin at the wharf stage, and is divided into independent embedding sections independently so as to facilitate the installation of the pump tower crane in the cabin.
In the third step, the liquid dome section and the corresponding deck section are manufactured in the same mold during section manufacturing, and are disassembled and lifted after the section manufacturing is finished.
In the fourth step, the transverse bulkhead keeps the integral integrity as much as possible during the sectional division, and the final requirement of the whole suspension of the transverse bulkhead is met, namely, part of the transverse bulkhead is not suitable to be divided into other sections of the four peripheral surfaces so as to prevent the flatness from being uncontrollable.
Based on the technical scheme, the segmentation division method for the cargo hold area of the film type LNG ship obtains the following technical effects through practical application:
1. the segmentation division method for the cargo hold area of the LNG ship meets the construction requirements of a cargo containment system according to the production factors of a shipyard, including processing capacity, a production field, hoisting and transporting capacity and the like during segmentation division, optimizes the total assembly and carrying, and improves the segmentation preassembly integrity and launching integrity.
2. Compared with the prior art, the segmentation division method for the cargo hold area of the LNG ship is more scientific and reasonable, firstly, the 3 key nodes W2, W3 and W5 are changed from a trihedral welding form to an inner shell surface circular arc connection design form, so that each node is reduced from original 4 fillet welds to 2 fillet welds, namely the welding workload is reduced by half, and taking a 17.4-ten-thousand-square LNG ship as an example, the length of the fillet welds can be reduced as follows: 194 m (total length of cargo compartment) × 6 (number of left and right nodes) × 2 (number of welding seams is reduced for each node) ═ 2328 m, welding workload and labor intensity are greatly reduced; secondly, marking all the key nodes W1-W5 into the interior of the segment, completing the installation precision of the nodes by the segment stage, and arranging the annular seams between the cabin sections in the transverse compartment, so that 1 annular seam is reduced in each liquid cargo cabin, thereby effectively ensuring the structure centering precision and the cabin capacity construction precision of the key nodes; thirdly, the cargo compartment segmentation and division method can realize the total segment construction with the length of a single compartment segment as a unit, creates conditions for the total segment preassembly of the CCS insulating box base, maximally realizes the forward movement of dock and wharf outfitting work, improves the ship launching integrity, and further shortens the dock period.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a segmentation method for a typical cross-section in the present invention.
Fig. 2 is a schematic diagram of a design form of a key node w2 of the wall of the cargo hold inner shell.
Fig. 3 is a schematic diagram of a design form of a key node w3 of the wall of the cargo hold inner shell.
Fig. 4 is a schematic diagram of a design form of a key node w5 of the wall of the cargo hold inner shell.
Fig. 5 is a schematic view of the division method in the ship length direction (longitudinal direction) in the present invention.
FIG. 6 is a schematic diagram of a method for segmenting the liquid dome region according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be understood that the terms "large seam", "circular seam", "broken line", etc. all refer to a "sectional dividing line"; the term "cargo containment system" is hereinafter referred to as "CCS".
The invention relates to a method for dividing a cargo hold area section of a film type LNG ship. The membrane type LNG ship cargo hold region involved therein is an octahedral structure having critical nodes of W1, W2, W3, W4 and W5 when constructed. The main idea of the invention is to divide the cargo area into a bottom segment, a bilge segment, a side segment, a top segment, a deck segment, a cofferdam segment and a liquid dome segment, and the method specifically comprises the following steps:
the method comprises the steps of firstly, carrying out sectional division along the cross section of a cargo hold area, aiming at the octahedral structure form of the cargo hold area of the thin film type LNG ship, adopting a division mode that one surface is a section, dividing eight inner shell surfaces into 8 typical section types, sequentially arranging a bottom section, a bilge section, a side top section and a deck section from bottom to top, wherein the bottom section and the deck section do not contain key nodes, and the rest sections contain 1 or 2 key nodes, so that the key nodes W1-W5 are all divided into the sections.
And secondly, carrying out sectional division along the length direction of the ship, namely longitudinally, wherein the film type LNG ship is designed into 4 cabins, except the 1# cabin, the cabin volumes of the 2# cabin and the 4# cabin are the same, the 1# cargo cabin is divided into 2 ring segments when the length is divided, the 2# cabin and the 4# cabin adopt the same plate length specification, each cabin segment is longitudinally divided into 3 ring segments, a circular seam between the two cabin segments is arranged in the transverse compartment, and a large seam of the bottom segment and the bilge segment is arranged in a large cabin on the front wall of the transverse compartment.
And thirdly, independently dividing the liquid dome area on the trap deck into independent sections.
And fourthly, the cofferdam is divided into sections in an independent division mode, the sections are combined into a whole under the condition that the hoisting capacity is met, the high-precision requirement of the cargo containment system on the flatness of the cofferdam is ensured, and meanwhile, a foundation is laid for the preassembly of the insulation box base on the cofferdam section.
Example 1
The following detailed description is to be read in connection with the drawings and the examples:
the embodiment provides a sectional division implementation method for a typical cross section of a cargo hold area of a film type LNG ship, which specifically comprises the following steps:
1) the whole cross section is divided into 8 typical subsection types according to eight inner shell surfaces, and the typical subsection types are a bottom subsection 1, a bilge subsection 2, a side subsection 3, a side top subsection 4 and a deck subsection 5 from bottom to top in sequence, wherein reference numerals 6-9 in the figure 1 are all cofferdam subsections. Wherein, the bottom section 1 and the deck section 5 do not contain key nodes, and the rest sections contain 1 or 2 key nodes, wherein the design form of the inner shell plate of the key nodes of W2, W3 and W5 needs to adopt an arc connection form, as shown in FIGS. 1 to 4.
2) And dividing the bilge segment, namely dividing W1 and W2 nodes into the bilge segment, wherein the W1 node is in a trihedral welding design, so that the broken line position of the inner bottom plate needs to reach a certain width, the width is preferably more than 1000mm, and the width is adopted to prevent the plate from generating large hot bending deformation during blanking and cutting. As shown in fig. 2, the W2 node is connected by circular arc plates, the broken line position of the circular arc plate of the inner shell at the node is determined by comprehensively considering the plate thickness distribution, the cold bending condition parameters of the processing equipment, the precision control, the lifting turning-over, and the height of the jig frame when manufacturing in a horizontal state with the oblique side as the base surface, the cold bending condition parameters of the processing equipment comprise the short side a and the long side b of the circular arc plate of the inner shell, generally, a + b is not less than 1000mm, the rolling bending requirement of the cold processing equipment can be met when the width a of the short side is not less than 300mm, and the height range of the jig frame is selected to be h ranging from 800mm to 1000 mm.
3) Side segmentation: a W3 node is inserted into a side section, and the broken line position of an inner shell arc plate at the node is determined by comprehensively considering plate thickness distribution, cold bending working condition parameters of processing equipment, precision control, lifting and turning, the height of a jig frame when a longitudinal wall is used as a base surface for side manufacturing and the like, wherein the height range of the jig frame is selected to be h-800-1000 mm. In FIG. 3, the W3 node is connected by arc plates, the width L or (a + b) of the general arc plate in the W3 node is not less than 1000mm, and the short side width a is not less than 300mm, thus the rolling bending requirement of cold-working equipment can be met.
4) And (3) segmenting the top of the ship: the W5 node is divided into the side section, as shown in figure 4, the W5 node in figure 4 adopts an arc plate connection form, the broken line position of the inner shell arc plate at the node is determined after comprehensive consideration is carried out on the height of a jig frame when the inner shell arc plate is manufactured in a side state by taking an oblique side as a base surface, the cold bending working condition parameters of the processing equipment comprise a short side a and a long side b of the inner shell arc plate, a + b is more than or equal to 1000mm, the width a of the short side is more than or equal to 300mm, the rolling bending requirement of the cold processing equipment can be met, and the height range of the jig frame is selected to be h-800-1000 mm.
As shown in fig. 5, because of the high precision requirement for the flatness of the shell surface in the cargo tank, the cofferdam can maintain its overall integrity as much as possible during the division of the cofferdam into sections, and at the same time, the final requirement for the integral suspension of the cofferdam is met, i.e., it is not suitable to divide part of the cofferdam into other sections around the periphery to prevent the uncontrollable flatness, i.e., several circumferential seams indicated by a in fig. 5 are all arranged in the cofferdam. Specifically, according to the factors such as the capacity of the production facility of the shipyard, the shipyard may be divided into four parts or into two parts, i.e., reference numerals 6, 7, 8 and 9 in fig. 1 are four-part cofferdam segments. The matching performance of the large joint in the transverse compartment and the height of a CCS scaffold platform in the large compartment is also considered so as to facilitate the site construction operation.
According to the production requirements of processing equipment capacity, hoisting and transporting capacity, segmented manufacturing site facilities and the like of a shipyard and the characteristics of an LNG ship, dividing each cargo hold into 3 annular seams along the longitudinal direction, wherein the length of each segment is preferably 18-20 meters, and the No. 1 cargo hold can be divided into 2 annular segments according to the length of the hold; it should be noted that all circumferential seam locations should avoid liquid domes, gas domes and side tank fabrication holes. In addition, the annular seam of the bottom segment and the bilge segment is moved forward from the inside of the transverse bulkhead to the inside of the large cabin, preferably more than 1000mm away from the transverse bulkhead, as shown at B in fig. 5, and the annular seam needs to be kept away from the position of the pump tower base on the inner bottom plate.
The method for segmenting the liquid dome provided by the embodiment comprises the following specific steps: as shown in fig. 6, the liquid dome area on the deck of the trap is the entrance of the cargo tank pump tower which is hoisted into the tank at the wharf stage, and for this purpose, the liquid dome area needs to be separately divided into independent embedding sections to facilitate the installation of the subsequent pump tower crane into the tank. When the segments are manufactured, the liquid dome segments C need to be manufactured together with the corresponding deck segments 5, large joints at the large joints are only subjected to positioning welding, and the liquid dome segments C are disassembled and lifted away after being finished, so that the folding precision of the liquid dome segments C during hoisting at a wharf is ensured, the repair workload is reduced, and the construction safety of a liquid cargo tank is ensured.
In view of the special requirements of the cargo containment system of the LNG ship, all cargo compartment section dividing lines need to avoid the central position of the base of the insulation box by more than 100 mm.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.
Claims (10)
1. A segmentation dividing method for a cargo hold area of a film type LNG ship is characterized in that the cargo hold area is divided into a bottom segment, a bilge segment, a side segment, a top segment, a deck segment, a cross bulkhead segment and a liquid dome segment, and specifically comprises the following steps:
the method comprises the steps that firstly, segmentation division is carried out along the cross section of a cargo hold area, the cargo hold area of a thin film type LNG ship is in an octahedral structure form, one surface is adopted as a segmentation division mode, eight inner shell surfaces are divided into 8 typical segmentation types, and a bottom segment, a bilge segment, a side segment and a deck segment are sequentially arranged from bottom to top, wherein the bottom segment and the deck segment do not contain key nodes, the rest segments respectively contain 1 or 2 key nodes, and the key nodes W1-W5 are guaranteed to be all divided into the segments;
secondly, carrying out segmentation division along the length direction of the ship, namely longitudinally, wherein the film type LNG ship is designed into 4 cabins, except the 1# cabin, the cabin capacity of the 2# to 4# cabin is the same, the 1# cargo cabin is divided into 2 ring sections during the length division, the 2# to 4# cabin adopts the same plate length specification, each cabin section of the 2# to 4# cabin is longitudinally divided into 3 ring sections, a circular seam between the two cabin sections is arranged in a transverse compartment, and large seams of a bottom section and a bilge section are arranged in a large cabin on the front wall of the transverse compartment;
thirdly, independently dividing a liquid dome area on a trap deck into independent sections;
and fourthly, the cofferdam is divided into sections in an independent division mode, the sections are combined into a whole under the condition that the hoisting capacity is met, the high-precision requirement of the cargo containment system on the flatness of the cofferdam is ensured, and meanwhile, a foundation is laid for the preassembly of the insulation box base on the cofferdam section.
2. The method of claim 1, wherein in the first step, the design of the nodes W2, W3 and W5 in the key nodes are optimized, and the inner shell walls at the nodes are optimized to be arc plates, so that the broken line size of the inner shell walls at the nodes is controlled within a reasonable range, which is to meet the pre-installation requirement of the insulation box base of the cargo containment system.
3. The method for sectionalizing the cargo space area of a film-type LNG ship according to claim 1, wherein in the first step, the W1 and W2 nodes among the key nodes are cut into the bilge segment, the W1 node is in the form of trihedral welded design, and the width of the broken line position of the inner bottom plate is more than 1000 mm; the W2 node adopts the circular arc board connection form, sets up 500mm department as the big seam position of inner skin board upwards at W2 node.
4. The method of claim 1, wherein in the first step, a W3 node is inserted into the side section, and is set 300mm upward from the W3 node as a large joint position of the inner skin.
5. The method of claim 1, wherein in the first step, a W5 node is inserted into the port section, and is set to 1600mm inward from the W5 node as a large joint position of the inner hull plate.
6. The method for sectionalizing the cargo area of a film-type LNG ship according to claim 1, wherein in the second step, the position of the circumferential seam of the bottom section and the bilge section is moved forward from the inside of the cofferdam to the inside of the large tank by a distance of more than 1000mm, and the circumferential seam is avoided from the position of the pump tower base on the inner bottom plate.
7. The method for segmenting the cargo hold area of the film type LNG ship according to claim 1, wherein in the second step, the cargo hold is longitudinally segmented into 3 circular seams, the length of each segment is preferably 18-20 m, and all the positions of the circular seams are kept away from liquid domes, air domes and side large-cabin process holes.
8. The method for sectioning the cargo area of a thin film type LNG ship according to claim 1, wherein in the third step, the liquid dome region on the deck of the well is an entrance of a liquid cargo tank pump tower which is hoisted into the tank at a wharf stage, and is individually sectioned into independent built-in sections to facilitate the installation of the pump tower crane into the tank.
9. The method for dividing the cargo area of a membrane type LNG ship according to claim 1, wherein in the third step, the liquid dome section is manufactured in the same mold as the corresponding deck section when the section is manufactured, and is disassembled and lifted after the section is finished.
10. The method of claim 1, wherein in the fourth step, the cofferdam is divided into sections while maintaining the integrity of the cofferdam, and the requirement of lifting the cofferdam is satisfied.
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