CN112158311A - LNG ship liquid dome segmented construction precision control method - Google Patents
LNG ship liquid dome segmented construction precision control method Download PDFInfo
- Publication number
- CN112158311A CN112158311A CN202010363803.9A CN202010363803A CN112158311A CN 112158311 A CN112158311 A CN 112158311A CN 202010363803 A CN202010363803 A CN 202010363803A CN 112158311 A CN112158311 A CN 112158311A
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- Prior art keywords
- carbon steel
- circle center
- deck
- inner deck
- liquid dome
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- 239000007788 liquid Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010276 construction Methods 0.000 title claims abstract description 18
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 68
- 239000010962 carbon steel Substances 0.000 claims abstract description 68
- 238000003466 welding Methods 0.000 claims abstract description 14
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- 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
- B63B73/20—Building or assembling prefabricated vessel modules or parts other than hull blocks, e.g. engine rooms, rudders, propellers, superstructures, berths, holds or tanks
Abstract
The invention discloses a method for controlling the segmented construction precision of a liquid dome of an LNG ship, which specifically comprises the following steps: constructing carbon steel segments in a reverse state; the carbon steel segment is overturned and hoisted to the inner deck, so that the circle center of a first round hole in the carbon steel segment is coincided with the circle center of a second round hole in the inner deck; welding and fixing the joint of the carbon steel segment and the inner deck to form a liquid dome section; the flatness of the carbon steel segment and the inner deck, and the straightness of the carbon steel segment are checked, and the deformation position is corrected. According to the invention, the trap deck and the carbon steel plate are assembled into the carbon steel segment, and then the carbon steel segment and the inner deck are folded into the liquid dome section, so that the construction precision of the liquid dome section can be effectively ensured, the construction quality of the liquid dome section is improved, and the wharf period is shortened.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to a method for controlling the segmented construction precision of a liquid dome of an LNG ship.
Background
The LNG ship liquid dome section is one of the major difficult point sections with high construction difficulty in the LNG ship construction process, the section structure is complex, carbon steel and stainless steel structures exist at the same time, the carbon steel and the stainless steel structures are very easy to deform during welding, and the welding difficulty is high; and release holes on the upper hydrazine surrounding deck and the inner deck of the section need to meet the requirement of concentricity, and the circle center is also the reference for subsequent pump tower installation. The quality of the manufacturing precision of the segment directly influences the subsequent manufacturing, positioning and hoisting work of the pump tower, so the manufacturing precision of the segment is extremely important. In the prior art, due to poor precision control in the manufacturing process of the section of the type, the problems of repeated hoisting, incapability of accurate butt joint and influence on the hoisting of a subsequent pump tower exist, and the construction quality and the wharf period of the liquid dome section are greatly influenced.
Disclosure of Invention
In view of the above, the present invention provides a method for controlling the accuracy of building a liquid dome of an LNG ship in sections, so as to solve the problems in the background art.
A method for controlling the liquid dome sectional construction precision of an LNG ship specifically comprises the following steps:
s1, reversely building carbon steel segments;
s2, overturning and hoisting the carbon steel segment to the inner deck, so that the circle center of the first round hole in the carbon steel segment is coincided with the circle center of the second round hole in the inner deck;
s3, welding and fixing the joint of the carbon steel segment and the inner deck to form a liquid dome segment;
and S4, checking the flatness of the carbon steel segment and the inner deck and the straightness of the carbon steel segment, and correcting the deformation position.
Preferably, the concrete steps of inversely constructing the carbon steel segment in the step S1 are as follows:
and placing the trap deck on the ground, and welding and fixing the carbon steel plate on the trap deck by taking the trap deck as a base surface according to a construction drawing.
Preferably, the step S2 of turning over and hoisting the carbon steel segment to the inner deck to make the center of the first circular hole in the carbon steel segment coincide with the center of the second circular hole in the inner deck includes the following specific steps:
s21, fixing the inner deck on a jig frame;
s22, finding the circle center of the second round hole on the inner deck by a plumb bob method and projecting and marking the circle center on the ground;
and S23, turning the carbon steel segment to be normal, hoisting and placing the carbon steel segment on the inner deck, and enabling the circle center of the first round hole on the trap deck of the carbon steel segment to coincide with the circle center of the second round hole by using a plumb bob method according to the mark on the ground.
Preferably, the coincidence deviation between the circle center of the first round hole and the circle center of the second round hole is not more than 2 mm.
Preferably, when the carbon steel segment and the inner deck are welded in the step S3, a welding process of symmetric welding is adopted to ensure that the circle center of the first circular hole on the carbon steel segment is always coincident with the circle center of the second circular hole on the inner deck.
Preferably, the inner deck is a stainless steel deck.
The invention has the beneficial effects that:
according to the invention, the trap deck and the carbon steel plate are assembled into the carbon steel segment, and then the carbon steel segment and the inner deck are folded into the liquid dome section, so that the construction precision of the liquid dome section can be effectively ensured, the construction quality of the liquid dome section is improved, and the wharf period is shortened.
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 schematic structural view of a carbon steel segment.
Fig. 2 is a schematic diagram of the structure of the liquid dome section.
The reference numerals in the figures have the meaning:
1 is a carbon steel segment, 2 is a trap deck, 3 is a carbon steel plate, 4 is an inner deck, 5 is a first round hole, and 6 is a liquid dome segment.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided 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 with reference to specific embodiments and with reference to the attached drawings.
In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance unless explicitly stated or limited otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention provides a method for controlling the segmented construction precision of a liquid dome of an LNG ship, which specifically comprises the following steps:
s1, carbon steel segment 1 is constructed in a reverse state.
Specifically, the trap deck 2 is placed on the ground, and then the carbon steel plate 3 is welded and fixed on the trap deck 2 by taking the trap deck 2 as a base surface according to a construction drawing.
The carbon steel segment 1 is constructed in the same tire with the deck section of the hull.
After the carbon steel segment 1 is built, the straightness of the edge of the longitudinal and transverse rib plate and the deviation of the installation position of each carbon steel plate 3 in the carbon steel segment 1 are detected by using a total station.
And S2, overturning and hoisting the carbon steel segment 1 onto the stainless steel inner deck 4, so that the circle center of a first round hole 5 on the carbon steel segment 1 coincides with the circle center of a second round hole (not shown in figure 2) on the inner deck 4.
Specifically, first, the inner deck 4 is fixed on the jig frame;
then, finding the circle center of a second round hole on the inner deck 4 by a plumb bob method and projecting and marking the circle center on the ground;
then, turning over the carbon steel segment 1 to be normal, hoisting the carbon steel segment to be moved into an inner field, placing the carbon steel segment on an inner deck 4, and folding the carbon steel segment and the inner deck 4; then, according to the projection point of the center of the second round hole marked on the ground, the position of the carbon steel segment 1 is adjusted, so that the center of the first round hole 5 on the trap deck 2 of the carbon steel segment 1 coincides with the center of the second round hole (the center of the first round hole 5 coincides with the center of the second round hole by using a plumb bob method).
The coincidence deviation between the circle center of the first round hole 5 and the circle center of the second round hole is not more than 2 mm.
And S3, welding and fixing the joint of the carbon steel segment 1 and the inner deck 4 to form the liquid dome section 6.
When the carbon steel segment 1 and the inner deck 4 are welded, a welding process of symmetrical welding is adopted to ensure that the circle center of a first round hole 5 on the carbon steel segment 1 is always coincident with the circle center of a second round hole on the inner deck 4.
And S4, checking the flatness of the carbon steel segment 1 and the inner deck 4 and the straightness of each carbon steel plate 3 in the carbon steel segment 1, judging whether the carbon steel segment or the inner deck is deformed in the welding process, and if so, knocking and correcting the deformed position.
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 (6)
1. The method for controlling the liquid dome sectional construction precision of the LNG ship is characterized by comprising the following steps:
s1, reversely building carbon steel segments;
s2, overturning and hoisting the carbon steel segment to the inner deck, so that the circle center of the first round hole in the carbon steel segment is coincided with the circle center of the second round hole in the inner deck;
s3, welding and fixing the joint of the carbon steel segment and the inner deck to form a liquid dome segment;
and S4, checking the flatness of the carbon steel segment and the inner deck and the straightness of the carbon steel segment, and correcting the deformation position.
2. The LNG carrier liquid dome section building accuracy control method according to claim 1, wherein the concrete steps of inversely building carbon steel sections in the step S1 are as follows:
and placing the trap deck on the ground, and welding and fixing the carbon steel plate on the trap deck by taking the trap deck as a base surface according to a construction drawing.
3. The LNG carrier liquid dome section building accuracy control method according to claim 2, wherein the step S2 of overturning and hoisting the carbon steel section onto the inner deck to make the circle center of the first round hole in the carbon steel section coincide with the circle center of the second round hole in the inner deck comprises the following specific steps:
s21, fixing the inner deck on a jig frame;
s22, finding the circle center of the second round hole on the inner deck by a plumb bob method and projecting and marking the circle center on the ground;
and S23, turning the carbon steel segment to be normal, hoisting and placing the carbon steel segment on the inner deck, and enabling the circle center of the first round hole on the trap deck of the carbon steel segment to coincide with the circle center of the second round hole by using a plumb bob method according to the mark on the ground.
4. The LNG carrier liquid dome section building accuracy control method according to claim 3, wherein a coincidence deviation between a circle center of the first circular hole and a circle center of the second circular hole is not more than 2 mm.
5. The LNG carrier liquid dome section building accuracy control method as claimed in claim 1, wherein when the carbon steel section and the inner deck are welded in the step S3, a symmetric welding process is adopted to ensure that the circle center of a first circular hole in the carbon steel section is always coincident with the circle center of a second circular hole in the inner deck.
6. The LNG ship liquid dome segment building accuracy control method of claim 1, wherein the inner deck is a stainless steel deck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010363803.9A CN112158311A (en) | 2020-04-30 | 2020-04-30 | LNG ship liquid dome segmented construction precision control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010363803.9A CN112158311A (en) | 2020-04-30 | 2020-04-30 | LNG ship liquid dome segmented construction precision control method |
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| Publication Number | Publication Date |
|---|---|
| CN112158311A true CN112158311A (en) | 2021-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010363803.9A Pending CN112158311A (en) | 2020-04-30 | 2020-04-30 | LNG ship liquid dome segmented construction precision control method |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110000900U (en) * | 2009-07-21 | 2011-01-27 | 주식회사 한진중공업 | Mounting jig for liquid dome cover of lng carrier |
| KR20120057045A (en) * | 2010-11-26 | 2012-06-05 | 삼성중공업 주식회사 | Separating-type gas dome and cargo tank including the same |
| 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 |
| KR20180084406A (en) * | 2017-01-17 | 2018-07-25 | 대우조선해양 주식회사 | Liquid dome box of membrane type liquefied natural gas cargo insulation system and sealing method thereof |
| KR20190031008A (en) * | 2017-09-15 | 2019-03-25 | 대우조선해양 주식회사 | Liquid dome box of membrane type liquefied natural gas cargo insulation system and sealing method thereof |
| KR20190056155A (en) * | 2017-11-16 | 2019-05-24 | 삼성중공업 주식회사 | Liquid dome structure of liquefied natural gas stroage tank |
| CN109854945A (en) * | 2018-12-13 | 2019-06-07 | 徐靖 | A kind of prismatic LNG flow container device of low-temperature atmosphere-pressure |
| CN110667801A (en) * | 2019-09-04 | 2020-01-10 | 沪东中华造船(集团)有限公司 | Sectional manufacturing method for deck of dome of LNG ship |
| KR20200012631A (en) * | 2018-07-27 | 2020-02-05 | 삼성중공업 주식회사 | Liquid dome and floating structure including the same |
-
2020
- 2020-04-30 CN CN202010363803.9A patent/CN112158311A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110000900U (en) * | 2009-07-21 | 2011-01-27 | 주식회사 한진중공업 | Mounting jig for liquid dome cover of lng carrier |
| KR20120057045A (en) * | 2010-11-26 | 2012-06-05 | 삼성중공업 주식회사 | Separating-type gas dome and cargo tank including the same |
| KR20180084406A (en) * | 2017-01-17 | 2018-07-25 | 대우조선해양 주식회사 | Liquid dome box of membrane type liquefied natural gas cargo insulation system and sealing method thereof |
| 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 |
| KR20190031008A (en) * | 2017-09-15 | 2019-03-25 | 대우조선해양 주식회사 | Liquid dome box of membrane type liquefied natural gas cargo insulation system and sealing method thereof |
| KR20190056155A (en) * | 2017-11-16 | 2019-05-24 | 삼성중공업 주식회사 | Liquid dome structure of liquefied natural gas stroage tank |
| KR20200012631A (en) * | 2018-07-27 | 2020-02-05 | 삼성중공업 주식회사 | Liquid dome and floating structure including the same |
| CN109854945A (en) * | 2018-12-13 | 2019-06-07 | 徐靖 | A kind of prismatic LNG flow container device of low-temperature atmosphere-pressure |
| CN110667801A (en) * | 2019-09-04 | 2020-01-10 | 沪东中华造船(集团)有限公司 | Sectional manufacturing method for deck of dome of LNG ship |
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Application publication date: 20210101 |
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