CN112078750B - Method for building outfield of gas dome cylinder of LNG ship - Google Patents
Method for building outfield of gas dome cylinder of LNG ship Download PDFInfo
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- CN112078750B CN112078750B CN202010799985.4A CN202010799985A CN112078750B CN 112078750 B CN112078750 B CN 112078750B CN 202010799985 A CN202010799985 A CN 202010799985A CN 112078750 B CN112078750 B CN 112078750B
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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
- B63B73/40—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by joining methods
- B63B73/43—Welding, e.g. laser welding
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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
- B63B73/60—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by the use of specific tools or equipment; characterised by automation, e.g. use of robots
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses an outfield construction method of a gas dome cylinder body of an LNG ship, which comprises the following steps: a hoisting ring is mounted on a dome deck; reversely placing the dome deck on the jig frame by utilizing the carrying hoisting ring, and normally placing the inner deck on the jig frame; marking a framework installation line and a cylinder inspection line on a dome deck according to a construction drawing; according to the framework installation line and the cylinder body inspection line, the framework and the cylinder body are welded and fixed on the dome deck; after the framework, the cylinder and the dome deck are fixed into a whole, the whole body is turned over and is aligned and folded on the inner deck; and (5) welding and fixing the cylinder body and the inner deck. According to the invention, the air dome cylinder is independently manufactured at the outfield, so that the problem of delayed accommodating period of the air dome cylinder caused by folding the traditional air dome cylinder at the outfield and in sections is effectively solved, and the construction time of the air dome cylinder is greatly shortened.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to an outfield construction method for an LNG ship gas dome cylinder.
Background
The LNG ship is used for transporting liquid natural gas, and the cargo holds need to be exchanged with air, inert gas, natural gas and other gases, so that the specific gravity of the gases is different, and the gas injection and discharge positions are different. The air dome is a stainless steel structure designed for gas injection and discharge of the cargo tank of the LNG ship.
Generally, the air dome cylinder is a component of a dome deck section, is manufactured in an on-site workshop in a section stage, is folded into a whole with the section stage through precision control, and is transported to an off-site hoisting and loading site in a final assembly stage. However, infield manufacturing is limited by plant infrastructure conditions and sometimes cannot completely meet the changing market demands of ships, and the completion time of the air dome body often has an embarrassing situation lagging behind the demand receiving period. The dome cylinder is used as an accurate installation component, the accuracy control process is complex, the reporting and testing requirements are high, the manufacturing period of the dome cylinder is not large, and the compressible space is small, so that the finished node of the whole dome deck section can be greatly influenced, the finished period of a cargo hold in the final assembly stage is further influenced, and the dock period is finally influenced.
In summary, a method for solving the problem of the slow storage period of the air dome cylinder, which is manufactured separately at the outer field instead of the inner field and the segment is absent at present.
Disclosure of Invention
In view of the above, the present invention provides a method for constructing an external field of a gas dome of an LNG ship, so as to solve the problems in the background art.
A construction method for an outfield of an air dome cylinder of an LNG ship specifically comprises the following steps:
s1, installing and carrying a hanging ring on a dome deck;
s2, reversely placing the dome deck on the jig frame by utilizing the carrying hoisting ring, normally placing the inner deck on the jig frame,
the side edge of the dome deck is connected with the jig frame through a plurality of positioning components, and the panel of the dome deck is connected with the jig frame through a plurality of horse boards;
s3, marking a framework installation line and a cylinder body inspection line on the dome deck according to a construction drawing;
s4, welding and fixing the framework and the cylinder on the dome deck according to the framework installation line and the cylinder inspection line;
s5, after the framework, the barrel and the dome deck are fixed into a whole, the whole body is turned over and is aligned and folded on the inner deck;
and S6, welding and fixing the cylinder body and the inner deck.
Preferably, the plurality of locating elements are distributed on three sides of the dome deck and the plurality of horse boards are distributed around the dome opening of the dome deck.
Preferably, the positioning assembly comprises a cushion block, a wedge block and a fixed clamping head,
the specific steps of reversely placing the dome deck on the jig frame by utilizing the carrying hoisting ring in the step S2 are as follows:
firstly, respectively placing a cushion block at a plurality of positions on the top edge of a jig frame;
secondly, connecting a hoisting tool with a carrying hoisting ring of the dome deck through a steel wire rope, and reversely hoisting the dome deck on a plane formed by a plurality of cushion blocks by using the hoisting tool;
then, fixing a fixed chuck at the position of the side end of the jig frame corresponding to the cushion block;
finally, the wedges are wedged into the gap between the fixed collets and the dome deck.
Preferably, the cushion block and the wedge block are both made of wood, the carrying lifting ring is a B-shaped lifting ring, and the total load of the carrying lifting ring is larger than the weight of a dome deck.
Preferably, the carrying rings are 4, the 4 carrying rings are symmetrically arranged on the dome deck, and the distances from the carrying rings on the left side and the right side to the corresponding sides of the dome deck are not more than 600mm.
Preferably, when the cylinder body is fixedly welded with the dome deck or the inner deck, the welding seam between the inner ring of the cylinder body and the dome deck or the inner deck is welded firstly by adopting a welding method of symmetrical cross welding, and then the welding seam between the outer ring of the cylinder body and the dome deck or the inner deck is welded.
Preferably, the horse board is made of stainless steel.
Preferably, the framework comprises ribs, stringers and stiffeners.
The invention has the beneficial effects that:
1. according to the invention, the dome cylinder body is independently manufactured at the outfield, so that the problem that the storage period of the dome cylinder body is delayed due to the fact that the traditional dome cylinder body is folded at the outfield and the sections is effectively solved, the construction time of the dome cylinder body is greatly shortened, and the finished nodes of the dome deck sections are moved forward, so that the completion period of the cargo hold at the final assembly stage is shortened, the construction efficiency of the ship is improved, and the construction production cost is also reduced.
2. The method has wide universality and is suitable for the outfield construction of the air dome cylinder of various ships.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a cross-sectional view of an air dome body.
Fig. 2 is a top view of a dome deck inverted placed on a jig frame.
Fig. 3 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A in fig. 2.
Fig. 4 is a sectional view taken along line B-B in fig. 2.
Fig. 5 is an enlarged view of a portion C in fig. 3.
Figure 6 is a schematic view of a frame installation line drawn on a dome deck.
FIG. 7 is a schematic view of a bowl check line drawn on a dome deck.
Fig. 8 is a schematic view of the positioning of the plumb bob method.
Fig. 9 is a schematic view of the arrangement of the carrying slings on the deck of the dome.
The reference numerals in the figures have the meaning:
the device comprises a dome deck 1, a carrying hoisting ring 2, a moulding bed 3, an inner deck 4, a horse board 5, a dome opening 6, a cushion block 7, a fixed chuck 8, a wedge block 9, a framework mounting line 10, a cylinder body inspection line 11, a cylinder body 12, an inner deck 13, a plumb hanging point 14 and a plumb 15.
Detailed Description
In order to better understand the technical scheme of the invention, the following detailed description of the embodiments of the invention is made with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present application is described in further detail below by way of specific embodiments in conjunction with the following figures.
In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described with reference to the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element through intervening elements.
The invention provides an outfield construction method of an air dome cylinder body of an LNG ship, which specifically comprises the following steps:
s1, a flying ring 2 is mounted on a dome deck 1.
The carrying hanging ring 2 is a B-shaped hanging ring, and the total load of the carrying hanging ring 2 is larger than the weight of the dome deck 1.
In this embodiment, 4 hoisting rings 2 are provided, and all of the 4 hoisting rings 2 are B-type hoisting rings having a rated load of 10 tons. 4 carry on rings 2 symmetry and set up on dome deck 1, and the distance of carrying on rings to the corresponding side of dome deck on left side and right side is all no more than 600mm.
S2, reversely placing the dome deck 1 on the jig frame 3 by utilizing the carrying hanging ring 2, and normally placing the inner deck 4 on the jig frame 3.
The sides of the dome deck 1 are connected to the moulding bed 3 by a plurality of positioning elements and the panels of the dome deck 1 are connected to the moulding bed 3 by a plurality of horse boards 5. In this embodiment, the plurality of positioning components are distributed on three sides of the dome deck 1; the horse board 5 is a stainless steel rectangular board, three horse boards 5 are arranged between the face plate of the dome deck 1 and the moulding bed 3, and the three horse boards 5 are distributed around the dome opening hole 6 of the dome deck 1.
Specifically, the dome deck 1 is inversely placed on the jig frame 3 by the following steps:
firstly, respectively placing a wooden cushion block 7 at a plurality of positions on the top edge of a jig frame 3, wherein the purpose of arranging the cushion blocks 7 is to prevent the jig frame 3 made of carbon steel from contacting with a dome deck 1 made of stainless steel;
secondly, a hoisting tool is connected with the carrying hoisting rings 2 of the dome deck 1 through a steel wire rope, and the dome deck 1 is reversely hoisted and placed on a plane formed by the cushion blocks 7 by the hoisting tool (such as a crane);
then, fixing a fixed chuck 8 at the position of the side end of the jig frame 3 corresponding to the cushion block 7, wherein in the embodiment, the fixed chuck 8 is a channel steel;
finally, the wooden wedge 9 is wedged in the gap between the fixed jaw 8 and the dome deck 1.
And S3, marking a framework installation line 10 and a barrel inspection line 11 on the dome deck 1 according to a construction drawing.
Typically the can 12 has a wall thickness of 11mm and therefore a 100mm check line is drawn outside the dome opening 6 in the dome deck as the can check line 11, i.e. the radius of the can check line 11 is 101mm greater than the radius of the dome opening 6.
And S4, welding and fixing the framework and the barrel 12 on the dome deck 1 according to the framework installation line 10 and the barrel inspection line 11.
Because the wall thickness of the cylinder 12 is thin, when welding, a welding method of symmetrical cross welding is adopted to firstly weld a welding seam between the inner ring of the cylinder 12 and the dome deck 1 and then weld a welding seam between the outer ring of the cylinder 12 and the dome deck 1, so that the welding heat release amount and the heat release position can be adjusted in real time, and the cylinder 12 can be prevented from being deformed during welding.
The framework comprises rib plates, longitudinal girders and reinforcing plates.
And S5, after the framework, the barrel 12 and the dome deck 1 are fixed into a whole, the whole body is turned over and is aligned and folded on the inner deck 13.
When the whole body of the barrel and the dome deck 1 is aligned and folded with the inner deck 13, the alignment and folding precision of the barrel and the dome deck 1 is verified through a plumb bob method, namely, a circle of 100mm inspection line is drawn outside a dome opening of the inner deck 13 in advance, one end of a plumb bob is fixed on the barrel inspection line 11 of the dome deck, the plumb bob is enabled to hang freely, whether the hammer tip of the plumb bob is only on the 100mm inspection line of the inner deck is observed, and if yes, the alignment precision of the whole body of the barrel and the dome deck 1 and the inner deck 13 meets the requirement.
And S6, welding and fixing the cylinder body 12 and the inner deck 13, and manufacturing the air dome cylinder body after welding.
When the cylinder 12 and the inner deck 13 are welded and fixed, a welding seam between the inner ring of the cylinder 12 and the inner deck 13 is welded firstly, and then a welding seam between the outer ring of the cylinder 12 and the inner deck 13 is welded by adopting a symmetrical cross welding method.
After the gas dome cylinder is manufactured, the gas dome cylinder can be carried to a ship to be welded and fixed. The gas dome cylinder body and the hull structure are fixed by adopting positioning welding, the welding length of each section of positioning welding is 50-100 mm, and the distance between adjacent positioning welding lines is 800mm.
After the air dome cylinder body is carried, if the stainless steel structure is deformed, the deformed position is pushed and corrected.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The method for building the external field of the gas dome cylinder body of the LNG ship is characterized by comprising the following steps:
s1, installing and carrying a hanging ring on a dome deck;
s2, reversely placing the dome deck on the jig frame by utilizing the carrying hoisting ring, normally placing the inner deck on the jig frame,
the side edge of the dome deck is connected with the jig frame through a plurality of positioning components, and the panel of the dome deck is connected with the jig frame through a plurality of horse boards;
s3, marking a framework installation line and a cylinder body inspection line on the dome deck according to a construction drawing;
s4, welding and fixing the framework and the cylinder on the dome deck according to the framework installation line and the cylinder inspection line;
s5, after the framework, the cylinder and the dome deck are fixed into a whole, the whole is turned over and is aligned and folded on the inner deck;
and S6, welding and fixing the cylinder body and the inner deck.
2. The LNG ship dome outfield construction method of claim 1, wherein the plurality of positioning assemblies are distributed on three sides of the dome deck and a plurality of horse boards are distributed around the dome opening of the dome deck.
3. The LNG ship gas dome outfield construction method of claim 2, wherein the positioning assembly comprises a spacer, a wedge and a fixed collet,
the specific steps of reversely placing the dome deck on the jig frame by utilizing the carrying hoisting ring in the step S2 are as follows:
firstly, respectively placing a cushion block at a plurality of positions on the top edge of a jig frame;
secondly, connecting a hoisting tool with a carrying hoisting ring of the dome deck through a steel wire rope, and reversely hoisting the dome deck by using the hoisting tool and placing the dome deck on a plane formed by a plurality of cushion blocks;
then, fixing a fixed chuck at the position of the side end of the jig frame corresponding to the cushion block;
finally, the wedges are wedged into the gap between the fixed collets and the dome deck.
4. The LNG carrier gas dome body outfield construction method according to claim 3, wherein the cushion blocks and the wedge blocks are both wood, the carrying hoisting rings are B-type hoisting rings, and the total load of the carrying hoisting rings is larger than the weight of a dome deck.
5. The LNG carrier balloon outfield construction method according to claim 1 or 4, wherein the carrying slings are 4, the 4 carrying slings are symmetrically arranged on a dome deck, and the distances from the carrying slings on the left side and the right side to the corresponding sides of the dome deck are not more than 600mm.
6. The LNG carrier gas dome cylinder outfield construction method according to claim 1, wherein when the cylinder is fixedly welded to the dome deck or the inner deck, a welding seam between an inner ring of the cylinder and the dome deck or the inner deck is welded, and then a welding seam between an outer ring of the cylinder and the dome deck or the inner deck is welded by adopting a symmetrical cross welding method.
7. The LNG carrier gas dome outfield construction method of claim 1, wherein the horse plate is made of stainless steel.
8. The LNG ship gas dome outfield construction method of claim 1, wherein the framework comprises a stiffener plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010799985.4A CN112078750B (en) | 2020-08-11 | 2020-08-11 | Method for building outfield of gas dome cylinder of LNG ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010799985.4A CN112078750B (en) | 2020-08-11 | 2020-08-11 | Method for building outfield of gas dome cylinder of LNG ship |
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| Publication Number | Publication Date |
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| CN112078750A CN112078750A (en) | 2020-12-15 |
| CN112078750B true CN112078750B (en) | 2022-11-29 |
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| CN202010799985.4A Active CN112078750B (en) | 2020-08-11 | 2020-08-11 | Method for building outfield of gas dome cylinder of LNG ship |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113460266A (en) * | 2021-07-02 | 2021-10-01 | 沪东中华造船(集团)有限公司 | High-precision building method for liquid dome of LNG (liquefied Natural gas) tank of ship |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011000901A (en) * | 2009-06-16 | 2011-01-06 | Ihi Marine United Inc | Dome structure for liquefied gas tank |
| KR20140028395A (en) * | 2012-08-28 | 2014-03-10 | 현대중공업 주식회사 | Gas dome of liquefied natural gas tank |
| KR20140002394U (en) * | 2012-10-12 | 2014-04-25 | 현대중공업 주식회사 | Jig for gas dome secondary barrier installation |
| KR20140117098A (en) * | 2013-03-26 | 2014-10-07 | 현대중공업 주식회사 | Method for constructing gas dome having secondary level plate in membrane type LNG carrier |
| KR20170020992A (en) * | 2015-08-17 | 2017-02-27 | 대우조선해양 주식회사 | Method of installation of gas-dome |
| FR3052843B1 (en) * | 2016-06-15 | 2018-07-06 | Gaztransport Et Technigaz | GAS DOME STRUCTURE FOR A SEALED AND THERMALLY INSULATING TANK |
| CN107284603B (en) * | 2017-05-15 | 2019-04-16 | 沪东中华造船(集团)有限公司 | LNG liquid vault segment is the same as tire manufacture, stage by stage folding method |
| CN109607392A (en) * | 2018-10-31 | 2019-04-12 | 沪东中华造船(集团)有限公司 | A kind of LNG ship cargo tank gas vault hanging object device and its application method |
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