CN114251596B - Large LNG storage tank dome plate connection method - Google Patents
Large LNG storage tank dome plate connection method Download PDFInfo
- Publication number
- CN114251596B CN114251596B CN202110529783.2A CN202110529783A CN114251596B CN 114251596 B CN114251596 B CN 114251596B CN 202110529783 A CN202110529783 A CN 202110529783A CN 114251596 B CN114251596 B CN 114251596B
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- plates
- dome
- top lining
- plate
- lining plate
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a method for connecting dome plates of a large LNG storage tank, which comprises the following steps: (1) When dome steel plates are paved, lap welding is adopted between steel plates in the longitudinal beam direction in the intersection area between the plates; (2) Shearing and misplacing the edge of the upper layer plate at the lap joint area; (3) In the ring beam direction, the adjacent steel plates in the ring direction are not welded at the upper flange of the longitudinal beam, and a space is arranged between the two plates. The dome plates are connected by adopting the method disclosed by the invention, so that the formation of welding residual stress is avoided, the treatment difficulty is reduced, and the steel consumption is saved.
Description
Technical Field
The invention relates to a method for connecting dome plates of a large LNG storage tank.
Background
In LNG concrete full-capacity tank engineering in the field of various engineering construction of petroleum and natural gas, dome installation and construction are key links, and a dome structure is a spherical steel structure dome and mainly comprises a steel structure dome and an aluminum alloy suspended ceiling. The steel structure vault is divided into a dome steel structure skeleton and a dome steel plate, so that the project amount of welding the dome in the tank is reduced as much as possible, the dome steel structure skeleton is prefabricated outside the tank and assembled in the tank in general engineering construction, and meanwhile, the dome steel plate is welded and paved. In the step, aiming at the welding and paving process of the dome plate, as shown in fig. 1, in the early conventional method, the difficulty of overlapping, paving and welding of four plates can occur at the intersection point of the dome longitudinal beam and the ring beam, the problem of prefabrication of steel plate paving sequence and steel plate angle cutting at the node is to be noted, the adverse phenomenon of concentrated welding seams can occur, welding residual stress is generated, and the conditions of cracking of the welding seams, deformation of the steel plates, reduction of bearing capacity of the steel plates and the like are increased. Meanwhile, the steel plate lap joint quantity of about 50mm is arranged along the ring beam direction, so that the steel material consumption is increased, the steel plate lap joint laying difficulty is increased, the time for constructors to process the joint is influenced, and the construction difficulty is increased.
Disclosure of Invention
The invention provides a method for connecting dome plates of a large LNG storage tank, which can save steel consumption and reduce stress concentration.
In order to solve the technical problems, the invention provides a method for connecting a dome plate of a large LNG storage tank, which comprises the following steps: (1) When dome steel plates are paved, lap welding is adopted between steel plates in the longitudinal beam direction in the intersection area between the plates; (2) Shearing and misplacing the edge of the upper layer plate at the lap joint area; (3) In the ring beam direction, the adjacent steel plates in the ring direction are not welded at the upper flange of the longitudinal beam, and a space is arranged between the two plates.
Further, when the intersection area between the plates is positioned at the middle section of the dome, in the longitudinal beam direction, the upper layer top lining plate and the lower layer top lining plate are welded in a lap joint manner; in the direction of the ring beam, a distance of 50mm is reserved between the left top lining plate and the right top lining plate.
Further, when the intersection area between the plates is positioned at the bottom of the dome, the distance between the left top lining plate and the right top lining plate is 50mm, a partition plate is arranged in the distance, and the compression-resistant ring is pressed against the top lining plate.
Further, when the intersection area between the plates is positioned at the top of the dome, in the longitudinal beam direction, the upper layer top lining plate and the lower layer top lining plate are welded in a lap joint manner; in the direction of the ring beam, a space with the width of 50mm is reserved between the left top lining plate and the right top lining plate, and a partition plate is arranged in the space.
The invention has the technical effects that: (1) The invention discloses a connection method of a dome plate, which simplifies the processing mode of joints at multiple plate junctions when the dome plate is paved, avoids the formation of welding residual stress, reduces the processing difficulty, and reduces the number of overlapping layers of steel plates and the amount of steel plate cutting prefabrication engineering. Taking a 22-square LNG storage tank as an example, the steel amount of twenty-thirty tons can be saved, meanwhile, the whole structure is simplified, the construction procedure is optimized, the construction efficiency is improved, the dome construction risk is reduced, and the high-quality completion of engineering construction is promoted; (2) The dome plate connecting method disclosed by the invention is simple and easy to understand, does not need specific training on constructors, and can ensure high quality of completing the whole complex process by adopting simple operation.
Drawings
Fig. 1 is a schematic view showing the manner in which plates are joined at the junction region between the plates in the conventional method.
Fig. 2 is a schematic perspective view of the manner in which the plates overlap at the intersection between dome top plates in accordance with the present invention.
Fig. 3 is a schematic perspective view of the manner in which the plates overlap at the intersection between the dome middle plates in the present invention.
Fig. 4 is a schematic perspective view of the manner in which the panels overlap at the intersection between the dome bottom panels in accordance with the present invention.
Fig. 5 is a schematic view of the direction a in fig. 3 according to the present invention.
Fig. 6 is a schematic diagram of the direction B of fig. 3 according to the present invention.
Reference numerals: 1. a top liner plate; 2. a compression ring; 3. a partition plate; 4. a longitudinal beam; 5. and a ring beam.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to limit the invention, so that those skilled in the art may better understand the invention and practice it.
The invention discloses a method for connecting dome plates of a large LNG storage tank, which is shown in figures 2 to 6 and has the following characteristics:
(1) When dome steel plates are paved, lap welding is adopted between steel plates in the longitudinal beam 4 direction in a plate intersection area;
(2) Shearing and misplacing the edge of the upper layer plate at the lap joint area;
(3) In the direction of the ring beam 5, the upper flange of the longitudinal beam 4 of the adjacent steel plates in the ring direction is not welded in a lap joint mode, and a space is reserved between the two plates.
In the embodiment 1, as shown in fig. 2, when the intersection area between the boards is positioned at the top of the dome, in the direction of the longitudinal beam 4, the upper layer top lining board 1 and the lower layer top lining board 1 are welded in a lap joint manner; in the direction of the ring beam 5, a space with the width of 50mm is reserved between the left top lining plate 1 and the right top lining plate 1, and a partition plate 3 is arranged in the space.
To ensure air tightness, a partition plate 3 having the same thickness as the top liner plate 1 is welded at the distance between the top liner plates 1. The separator 3 is typically flat steel.
The upper layer top lining board 1 is a whole board, the upper layer top lining board 1 is sheared and misplaced at the interval, and the two welding seams are ensured to be symmetrically staggered. The baffle 3 is arranged below the shearing dislocation.
In the embodiment 2, as shown in fig. 3, when the intersection area between the boards is positioned at the middle section of the dome, in the direction of the longitudinal beam 4, the upper layer top lining board 1 and the lower layer top lining board 1 are welded in a lap joint manner; in the direction of the ring beam 5, a distance of 50mm is left between the left and right top lining plates 1.
The upper layer top lining board 1 is two boards, and the upper edge of the lower layer top lining board 1 is connected with the upper layer top lining board 1 by lap welding. Wherein, the upper layer top lining board 1 is cut and misplaced at the overlapping position with the lower layer top lining board 1, so that the distance between the left and right top lining boards 1 of the upper layer is more than 50mm.
In example 3, as shown in fig. 4, when the intersection area between the plates is positioned at the bottom of the dome, the distance between the left and right top lining plates 1 is 50mm, a partition plate 3 is arranged in the distance, and the compression-resistant ring 2 is pressed against the top lining plates 1.
The compression ring 2 acts as an upper layer plate and is pressed against the lower layer top lining plate 1, and shearing dislocation is carried out at the superposition position of the compression ring 2 and the lower layer top lining plate 1. A partition plate 3 is provided directly below the cut.
Lap welding means that the lower edge of the upper layer plate is partially overlapped with the upper edge of the upper layer plate, and the upper layer plate and the lower layer plate are fixed at the overlapped part in a welding mode. And the structural stability is ensured, and at least two welding passes are performed when the edge of the upper layer plate and the lower layer plate in the lap joint area are welded. The upper layer plate is sheared and misplaced, so that the two welding seams achieve the symmetrical and staggered effect, the continuity of the fillet weld can be ensured at the lap joint position, and the welding residual stress caused by the concentrated welding seams can be avoided.
The above-described embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (1)
1. A method for connecting dome plates of large LNG storage tanks is characterized by comprising the following steps:
(1) When dome steel plates are paved, lap welding is adopted between steel plates in the longitudinal beam direction in the intersection area between the plates;
(2) Shearing and misplacing the edge of the upper layer plate at the lap joint area;
(3) In the ring beam direction, the adjacent steel plates in the ring direction are not welded at the upper flange of the longitudinal beam, and a space is reserved between the two plates;
when the intersection area between the plates is positioned at the middle section of the dome, the upper layer top lining plate and the lower layer top lining plate are welded in a lap joint manner in the longitudinal beam direction; a 50mm distance is reserved between the left top lining plate and the right top lining plate in the direction of the ring beam;
when the intersection area between the plates is positioned at the bottom of the dome, the distance between the left top lining plate and the right top lining plate is 50mm, a partition plate is arranged in the distance, and the compression-resistant ring is pressed against the top lining plate;
when the intersection area between the plates is positioned at the top of the dome, in the longitudinal beam direction, the upper layer top lining plate and the lower layer top lining plate are welded in a lap joint manner; in the direction of the ring beam, a space with the width of 50mm is reserved between the left top lining plate and the right top lining plate, and a partition plate is arranged in the space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110529783.2A CN114251596B (en) | 2021-05-14 | 2021-05-14 | Large LNG storage tank dome plate connection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110529783.2A CN114251596B (en) | 2021-05-14 | 2021-05-14 | Large LNG storage tank dome plate connection method |
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| Publication Number | Publication Date |
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| CN114251596A CN114251596A (en) | 2022-03-29 |
| CN114251596B true CN114251596B (en) | 2023-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110529783.2A Active CN114251596B (en) | 2021-05-14 | 2021-05-14 | Large LNG storage tank dome plate connection method |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5411516A (en) * | 1977-06-28 | 1979-01-27 | Nippon Steel Corp | Anticorrosion method of tank bottom |
| JPH04119298A (en) * | 1990-09-05 | 1992-04-20 | Ishikawajima Harima Heavy Ind Co Ltd | Roof construction method for underground cryogenic liquid storage tank |
| JPH10264990A (en) * | 1997-03-24 | 1998-10-06 | Ishii Iron Works Co Ltd | Flat-bottomed cylindrical tank |
| CN101972897A (en) * | 2010-08-17 | 2011-02-16 | 中国石油化工股份有限公司 | Tank top installing and welding process of single-coating double-wall low temperature storage tank |
| KR20120058171A (en) * | 2010-11-29 | 2012-06-07 | 한국과학기술원 | Structure for connecting insulation protective wall liquefied natural gas tank ship |
| JP2013043679A (en) * | 2011-08-25 | 2013-03-04 | Ihi Corp | Low-temperature tank and method of constructing the same |
| CN203147272U (en) * | 2013-03-20 | 2013-08-21 | 兰州蓝亚石油化工装备工程有限公司 | Tank top structure of large low-temperature storage tank |
| CN109570792A (en) * | 2018-11-28 | 2019-04-05 | 中国石油工程建设有限公司 | A kind of big tank bottom structure of novel LNG and its welding procedure method |
| CN112227527A (en) * | 2020-10-22 | 2021-01-15 | 中海石油气电集团有限责任公司 | A prestressed steel reinforcement system for dome ring beam and its construction method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6911955B2 (en) * | 2003-07-16 | 2005-06-28 | Raytheon Company | High strength fabric structure and seam therefor with uniform thickness and a method of making same |
| US20110283638A1 (en) * | 2008-12-23 | 2011-11-24 | Shockley Lestle R | Ring Beam and Method for Constructing the Same |
-
2021
- 2021-05-14 CN CN202110529783.2A patent/CN114251596B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5411516A (en) * | 1977-06-28 | 1979-01-27 | Nippon Steel Corp | Anticorrosion method of tank bottom |
| JPH04119298A (en) * | 1990-09-05 | 1992-04-20 | Ishikawajima Harima Heavy Ind Co Ltd | Roof construction method for underground cryogenic liquid storage tank |
| JPH10264990A (en) * | 1997-03-24 | 1998-10-06 | Ishii Iron Works Co Ltd | Flat-bottomed cylindrical tank |
| CN101972897A (en) * | 2010-08-17 | 2011-02-16 | 中国石油化工股份有限公司 | Tank top installing and welding process of single-coating double-wall low temperature storage tank |
| KR20120058171A (en) * | 2010-11-29 | 2012-06-07 | 한국과학기술원 | Structure for connecting insulation protective wall liquefied natural gas tank ship |
| JP2013043679A (en) * | 2011-08-25 | 2013-03-04 | Ihi Corp | Low-temperature tank and method of constructing the same |
| CN203147272U (en) * | 2013-03-20 | 2013-08-21 | 兰州蓝亚石油化工装备工程有限公司 | Tank top structure of large low-temperature storage tank |
| CN109570792A (en) * | 2018-11-28 | 2019-04-05 | 中国石油工程建设有限公司 | A kind of big tank bottom structure of novel LNG and its welding procedure method |
| CN112227527A (en) * | 2020-10-22 | 2021-01-15 | 中海石油气电集团有限责任公司 | A prestressed steel reinforcement system for dome ring beam and its construction method |
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| CN114251596A (en) | 2022-03-29 |
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