CN112550614A - Segmented construction method for liquid dome of LNG ship - Google Patents
Segmented construction method for liquid dome of LNG ship Download PDFInfo
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- CN112550614A CN112550614A CN202011396483.3A CN202011396483A CN112550614A CN 112550614 A CN112550614 A CN 112550614A CN 202011396483 A CN202011396483 A CN 202011396483A CN 112550614 A CN112550614 A CN 112550614A
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- deck
- segment
- liquid dome
- stainless steel
- steel plate
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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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- 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
- B63B73/10—Building or assembling vessels from prefabricated hull blocks, i.e. complete hull cross-sections
Abstract
The invention relates to a method for building a liquid dome of an LNG ship in sections, which is characterized in that a liquid dome section carbon steel segment is embedded into a well surrounding deck segment when being built, the liquid dome section carbon steel segment and the well surrounding deck segment are built in the same mould, only constraint welding is carried out between the liquid dome section carbon steel segment and the well surrounding deck segment, after the deck segment is carried and positioned, the hole opening position of a pump tower is accurately measured, the constraint welding between the liquid dome section carbon steel segment and the deck segment is cut off, the liquid dome section carbon steel segment is lifted away from a dock and returned to the mould position for continuous building, and the hole opening position on the well surrounding deck of the liquid dome section is determined according to the hole opening position on a stainless steel plate. By the construction method, the installation of the holes in the stainless steel plate and the holes in the pump tower structure can meet the precision requirement, and the problem of rework due to insufficient precision in the later period is solved.
Description
Technical Field
The invention relates to the field of LNG ships, in particular to a method for building a liquid dome of an LNG ship in a segmented mode.
Background
The liquefied natural gas carrier is an LNG carrier for short, and is a ship for transporting liquefied natural gas. The liquid dome section is a small section embedded in a deck section at the top of a liquid cargo tank of the LNG ship, holes are required to be formed in the upper deck and the lower deck of the section to enable a pump tower structure in the liquid cargo tank to penetrate through the liquid dome section, the positions of the holes of the pump tower on the upper deck and the lower deck of the liquid dome section are important, and deviation cannot exceed 3 mm.
Based on the method, the deviation of the opening positions of the pump towers on the upper deck and the lower deck of the liquid dome section is not more than 3mm after the construction is finished.
Disclosure of Invention
In order to achieve the technical purpose, the invention provides a method for building a liquid dome of an LNG ship in sections, which is used for ensuring the building efficiency and the building precision, and the technical purpose of the invention is realized by the following technical scheme:
a method for building a liquid dome section of an LNG ship comprises the following steps:
s1, assembling and folding a trap deck segment and an inner deck into a deck segment, wherein the trap deck segment comprises a liquid dome segment carbon steel segment and a deck segment trap deck, the liquid dome segment carbon steel segment comprises a liquid dome segment trap deck, the inner deck assembly comprises the inner deck and longitudinal ribs, and a stainless steel plate at the position, corresponding to the installation position of the liquid dome segment carbon steel segment, on the inner deck is temporarily not installed;
s2, mounting the pump tower after the deck is in the dock section, measuring the position of the hole on the inner deck according to the mounting position of the pump tower, processing a stainless steel plate, and forming the hole on the stainless steel plate;
s3, after the liquid dome section carbon steel segment is separated from the deck section, lifting the liquid dome section carbon steel segment away from the dock;
s4, taking a stainless steel plate as a base surface, folding the liquid dome section carbon steel segment with the stainless steel plate to form a liquid dome section, turning the liquid dome section over by 180 degrees, and opening holes on the liquid dome section trap deck according to the holes on the stainless steel plate;
and S5, turning the liquid dome section for 180 degrees again, and installing a manhole cover.
Further, S1 includes the steps of:
step 1, manufacturing a well-enclosing deck segment jig frame, building a liquid dome segmented carbon steel segment and a well-enclosing deck segment on the well-enclosing deck segment jig frame in the same mold, and fixing the liquid dome segmented well-enclosing deck and a deck segmented well-enclosing deck in a restraining welding mode;
step 2, manufacturing a segmented closure jig frame, splicing plates on the segmented closure jig frame to manufacture an inner deck, welding longitudinal ribs on the inner deck, and temporarily not installing a stainless steel plate in an area corresponding to the segmented carbon steel segment of the liquid dome on the inner deck;
and 3, taking the assembly in the inner deck as a base surface, and folding the trap deck segment with the assembly in the inner deck after turning over.
Further, in S2, holes are drilled on the stainless steel inner deck according to the measured hole data, and it is checked whether the hole size is correct, and the hole deviation is controlled within 3 mm.
Further, S4 includes the steps of:
step 1, building a jig frame by taking a stainless steel plate as a base surface, and paving and marking the stainless steel plate on the jig frame;
step 2, folding and positioning the liquid dome section carbon steel segment and a stainless steel plate to form a liquid dome section;
further, in S5, after the liquid dome turns over 180 ° in a segmented manner and returns to the tire frame:
step 1, a stainless steel plate is attached to a jig frame, the center manhole position of the stainless steel plate is fixed with the jig frame in a spot welding mode, and the stainless steel plate is fixed with a liquid dome segmented carbon steel segment in a welding mode;
and 2, installing a manhole cover on the stainless steel plate, wherein the manhole cover comprises a manhole seat cover plate and a manhole seat, the manhole seat cover plate is installed at the upper end of the manhole seat, and the gap between the manhole seat cover plate and the inner deck is detected before installation, so that the gap is not more than 2 mm.
Compared with the prior art, the method has the advantages that the position of the hole in the stainless steel plate is determined through the installation of the pump tower, the position of the hole in the liquid dome segmented trap deck is determined according to the position of the hole in the stainless steel plate, the concentricity of the hole in the stainless steel plate and the hole in the pump tower structure is guaranteed to meet the requirement, the construction precision is high, the problem of rework due to insufficient later precision is solved, and the construction efficiency is improved.
Drawings
Figure 1 is a schematic view of the deck section assembly of the present invention.
Figure 2 is a schematic view of the installation of the manhole cover of the present invention.
FIG. 3 is a schematic view of the outer ring of the manhole cover.
In the figure, 1, a segment of liquid dome section carbon steel; 2. a trap deck segment; 3. assembling the inner deck; 4. deck segmentation; 5. a manhole base cover plate; 6. a manhole base; 11. a liquid dome segmented trap deck; 21. the deck is a segmented trap deck; 31. an inner deck; 32. stainless steel plate.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments:
a method for constructing a liquid dome of an LNG ship, as shown in fig. 1, the method comprising the steps of:
s1, manufacturing a trap deck segment jig frame, constructing a liquid dome segment carbon steel segment 1 and a trap deck segment 2 on the trap deck segment jig frame in the same manner, fixing the liquid dome segment trap deck 11 and the deck segment trap deck 21 by constraint welding, marking a stringer framework installation line on the liquid dome segment trap deck 11 and the deck segment trap deck 21, installing a stringer and a stringer framework, welding and constraining butt seams between the stringer framework on the liquid dome segment trap deck and the stringer framework on the deck segment trap deck by constraint welding, wherein the constraint welding length is 80-100mm, and the distance between each segment of constraint welding is 500 mm.
Manufacturing a sectional folding jig frame, manufacturing an inner deck middle assembly 3 on the sectional folding jig frame: manufacturing an inner deck 31 on the segmented closure jig frame by using a carbon steel spliced plate, welding a longitudinal rib on the inner deck 31, temporarily not installing a stainless steel plate 32 in the area of the inner deck 31 corresponding to the liquid dome segmented carbon steel segment 1, forming an opening in the inner deck, and fixing the inner deck with the closure jig frame along the opening position for one circle by using a horse plate to prevent welding deformation;
turning over the trap deck segment 2 and folding the inner deck middle assembly 3 to form a deck segment 4 by using the inner deck middle assembly 3 as a base surface, and welding internal frameworks of the deck segment.
S2, carrying out dock carrying after deck segmentation, measuring the position of the hole on the stainless steel plate which is not installed in the inner deck and assembled according to the installation position of the pump tower after deck segmentation carrying and positioning are finished, feeding the measured data back to a design department, and compiling a hole opening program according to the fed data by the design department; manufacturing an uninstalled stainless steel plate 32, scribing on the stainless steel plate according to the opening measurement data, checking whether the opening and the scribing size are correct or not, filling a record table, cutting and opening the opening on the stainless steel plate 32 through a numerical control cutting machine, checking whether the opening size is correct or not, and controlling the opening deviation within 3 mm.
And S3, cutting out the bound welding between the liquid dome section carbon steel section 1 and the deck section 4 after the hole position measurement on the stainless steel plate 32 is finished, and lifting the liquid dome section carbon steel section 1 away from the dock.
S4, building a jig frame by taking the stainless steel plate 32 as a base surface, paving plates on the jig frame, marking, turning over the liquid dome section carbon steel segment 1, folding and positioning the stainless steel plate 32 to form the liquid dome section, turning over the liquid dome section by 180 degrees to enable the stainless steel plate 32 to be placed at the upper end of the liquid dome section, marking the opening position and the size of the trap deck on the trap deck 11 of the liquid dome section by a line swinging hammer method according to the opening on the stainless steel plate 32, and opening holes according to the opening position and the size.
S5, turning the liquid dome section for 180 degrees again, enabling the stainless steel plate 32 to be located at the lower end of the liquid dome section, checking the tightness of the stainless steel plate and the jig frame, ensuring that the stainless steel plate is tightly attached to the jig frame, adjusting the concentricity of the opening of the stainless steel plate and the opening of the trap deck on the trap deck of the liquid dome section to be within 3mm, and fixing the edge of the opening of the stainless steel plate and the jig frame in a spot welding manner to ensure the flatness of a subsequent manhole cover; and the stainless steel plate is welded and fixed with the carbon steel segment of the liquid dome section.
The manhole cover is installed on the stainless steel plate, and comprises a manhole seat cover plate 5 and a manhole seat 6, as shown in fig. 2, the manhole seat cover plate 5 is installed at the upper end of the manhole seat 6, and the gap between the manhole seat cover plate 5 and the inner deck 31 is inspected before installation, so that the gap is not more than 2 mm. The inner ring and the outer ring of the manhole seat 6 are assembled and positioned and welded, and symmetric welding and alternate welding inside and outside are adopted during welding, as shown in figure 3.
The present invention is further explained and not limited by the embodiments, and those skilled in the art can make various modifications as necessary after reading the present specification, but all the embodiments are protected by the patent law within the scope of the claims.
Claims (5)
1. A method for building a liquid dome section of an LNG ship is characterized by comprising the following steps:
s1, assembling and folding a trap deck segment and an inner deck into a deck segment, wherein the trap deck segment comprises a liquid dome segment carbon steel segment and a deck segment trap deck, the liquid dome segment carbon steel segment comprises a liquid dome segment trap deck, the inner deck assembly comprises the inner deck and longitudinal ribs, and a stainless steel plate at the position, corresponding to the installation position of the liquid dome segment carbon steel segment, on the inner deck is temporarily not installed;
s2, mounting the pump tower after the deck is in the dock section, measuring the position of the hole on the inner deck according to the mounting position of the pump tower, processing a stainless steel plate, and forming the hole on the stainless steel plate;
s3, after the liquid dome section carbon steel segment is separated from the deck section, lifting the liquid dome section carbon steel segment away from the dock;
s4, taking a stainless steel plate as a base surface, folding the liquid dome section carbon steel segment with the stainless steel plate to form a liquid dome section, turning the liquid dome section over by 180 degrees, and opening holes on the liquid dome section trap deck according to the holes on the stainless steel plate;
and S5, turning the liquid dome section for 180 degrees again, and installing a manhole cover.
2. The LNG ship liquid dome segment building method of claim 1, wherein S1 comprises the steps of:
step 1, manufacturing a well-enclosing deck segment jig frame, building a liquid dome segmented carbon steel segment and a well-enclosing deck segment on the well-enclosing deck segment jig frame in the same mold, and fixing the liquid dome segmented well-enclosing deck and a deck segmented well-enclosing deck in a restraining welding mode;
step 2, manufacturing a segmented closure jig frame, splicing plates on the segmented closure jig frame to manufacture an inner deck, welding longitudinal ribs on the inner deck, and temporarily not installing a stainless steel plate in an area corresponding to the segmented carbon steel segment of the liquid dome on the inner deck;
and 3, taking the assembly in the inner deck as a base surface, and folding the trap deck segment with the assembly in the inner deck after turning over.
3. The LNG ship liquid dome segment building method of claim 1, wherein in S2, a hole is formed on a stainless steel inner deck according to the measured hole forming data, and it is checked whether the hole size is correct, and the hole forming deviation is controlled within 3 mm.
4. The LNG ship liquid dome segment building method of claim 1, wherein S4 comprises the steps of:
step 1, building a jig frame by taking a stainless steel plate as a base surface, and paving and marking the stainless steel plate on the jig frame;
step 2, folding and positioning the liquid dome section carbon steel segment and a stainless steel plate to form a liquid dome section;
and 3, turning the liquid dome in sections by 180 degrees, marking the opening position and size of the trap deck on the liquid dome section trap deck according to the opening position on the stainless steel plate, and opening holes.
5. The method for building the liquid dome section of the LNG ship according to claim 1, wherein in S5, after the liquid dome section is turned over for 180 degrees and returns to a moulding bed:
step 1, a stainless steel plate is attached to a jig frame, the center manhole position of the stainless steel plate is fixed with the jig frame in a spot welding mode, and the stainless steel plate is fixed with a liquid dome segmented carbon steel segment in a welding mode;
and 2, installing a manhole cover on the stainless steel plate, wherein the manhole cover comprises a manhole seat cover plate and a manhole seat, the manhole seat cover plate is installed at the upper end of the manhole seat, and the gap between the manhole seat cover plate and the inner deck is detected before installation, so that the gap is not more than 2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011396483.3A CN112550614A (en) | 2020-12-03 | 2020-12-03 | Segmented construction method for liquid dome of LNG ship |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011396483.3A CN112550614A (en) | 2020-12-03 | 2020-12-03 | Segmented construction method for liquid dome of LNG ship |
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| CN112550614A true CN112550614A (en) | 2021-03-26 |
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| CN202011396483.3A Pending CN112550614A (en) | 2020-12-03 | 2020-12-03 | Segmented construction method for liquid dome of LNG ship |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114750872A (en) * | 2021-11-29 | 2022-07-15 | 沪东中华造船(集团)有限公司 | Gas-liquid combined dome structure of B-type LNG fuel tank for dual-fuel ultra-large container ship |
| CN115255733A (en) * | 2022-08-09 | 2022-11-01 | 沪东中华造船(集团)有限公司 | Installation method of marine pilot door |
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| CN109219719A (en) * | 2017-05-05 | 2019-01-15 | 气体运输技术公司 | Handle the method and storage device of the cargo of liquefied gas |
| KR102039680B1 (en) * | 2018-07-27 | 2019-11-01 | 삼성중공업 주식회사 | Floating structure |
| FR3082916A1 (en) * | 2018-06-25 | 2019-12-27 | Gaztransport Et Technigaz | METHOD FOR ASSEMBLING A LIQUID DOME |
| KR102060718B1 (en) * | 2018-07-27 | 2019-12-30 | 삼성중공업 주식회사 | Method for producing a liquid dome and method for producing a floating structure including the same |
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2020
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Patent Citations (6)
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| CN109219719A (en) * | 2017-05-05 | 2019-01-15 | 气体运输技术公司 | Handle the method and storage device of the cargo of liquefied gas |
| CN107284603A (en) * | 2017-05-15 | 2017-10-24 | 沪东中华造船(集团)有限公司 | LNG liquid vault fragments are with tire manufacture, stage by stage folding method |
| FR3082916A1 (en) * | 2018-06-25 | 2019-12-27 | Gaztransport Et Technigaz | METHOD FOR ASSEMBLING A LIQUID DOME |
| KR102039680B1 (en) * | 2018-07-27 | 2019-11-01 | 삼성중공업 주식회사 | Floating structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114750872A (en) * | 2021-11-29 | 2022-07-15 | 沪东中华造船(集团)有限公司 | Gas-liquid combined dome structure of B-type LNG fuel tank for dual-fuel ultra-large container ship |
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Application publication date: 20210326 |