CN114104188A - Liquefied gas ship deck structure - Google Patents
Liquefied gas ship deck structure Download PDFInfo
- Publication number
- CN114104188A CN114104188A CN202111455080.6A CN202111455080A CN114104188A CN 114104188 A CN114104188 A CN 114104188A CN 202111455080 A CN202111455080 A CN 202111455080A CN 114104188 A CN114104188 A CN 114104188A
- Authority
- CN
- China
- Prior art keywords
- deck
- liquefied gas
- strong
- longitudinal
- gas carrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005057 refrigeration Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009423 ventilation Methods 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
- B63B3/00—Hulls characterised by their structure or component parts
- B63B3/14—Hull parts
- B63B3/48—Decks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
- B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B3/00—Hulls characterised by their structure or component parts
- B63B3/14—Hull parts
- B63B3/48—Decks
- B63B3/52—Pillars; Deck girders
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a liquefied gas carrier deck structure, which relates to the field of liquefied gas carrier design and comprises deck strong cross beams, deck longitudinal girders and deck aggregates; the weather deck is provided with a ventilating mast, a cargo hold is arranged below the weather deck, the weather deck is provided with a deck strong cross beam, a deck longitudinal girder and deck aggregates, and the bottom of the weather deck is of a smooth flat plate structure; the deck longitudinal girders and the deck aggregates are arranged along the length direction of the ship body, and the deck strong cross beams are connected with and vertical to the deck longitudinal girders. The invention reduces the influence of the limit of the air height of the liquefied gas carrier on the height of the cargo tank, and can design a deck structure form with larger cargo tank volume and lighter weight under the condition of certain ship size; in addition, a safer and more convenient monitoring mode for insulation of the upper surface of the cargo tank is also provided.
Description
Technical Field
The invention relates to the field of liquefied gas carrier design, in particular to a liquefied gas carrier deck structure.
Background
The liquefied gas carrier is one of various ship types, as goods are mostly low-temperature goods, the ship type has special requirements on cargo tanks, and main cargo tank types comprise an A-type independent tank, a B-type prismatic independent tank, a B-type Moss tank, a C-type independent tank, a film cabin and the like. The present invention is primarily directed to a C-type stand alone tank, a typical cross-section of such a tank being shown in figures 1 and 2.
Such tanks have found numerous applications on many real ships, particularly sea ships, with a common layout feature, namely the typical cross-section of the cargo hold from top to bottom, in turn, the weather deck, the support structures such as the deck beams, the tanks themselves, the inner bottom (if any), and the outer bottom.
In addition, for the liquefied gas carrier, according to the specification requirement, "a ventilating mast with a certain height needs to be arranged on the weather deck", the requirement is often the bottleneck of design for some ships with bridge passing requirements or with certain limitation on the altitude. Taking a ship passing through the Nanjing Yangtze river bridge as an example, the Nanjing Yangtze river bridge has a requirement of 24m for the altitude, namely the distance from the water surface of the passing ship to the highest point on the water surface of the ship cannot exceed 24m, and a certain margin of about 2m is reserved. The requirement for the provision of a ventilated mast for a liquefied gas carrier is that the height of the ventilated mast, starting from the weather deck, must not be below the maximum value between 1/3 and 6m of the beam B. Taking a 30m wide ship as an example, the highest point of the ventilating mast is at least max (30/3,6) ═ 10m away from the weather deck, when the lowest draught of the ship is fixed, the height of the weather deck of the ship is limited by the air height, the height of the cargo tank is correspondingly limited by the weather deck and the lower strong beams of the deck, and the cargo hold capacity is difficult to be made large. As shown in more detail in figure 3 below.
With the increase of the size of the ship, especially the increase of the width direction of the ship, the transverse span of the strong beam under the deck is undoubtedly increased, and the strong beam is always higher in strength to ensure sufficient strength. In the prior art, as shown in fig. 1 and fig. 2, deck strong beams are all arranged below a weather deck, and when the height of the weather deck is limited by the altitude, the higher the deck strong beams are, the smaller the height of a cargo tank is, and the smaller the cargo tank capacity is. On the contrary, if the cargo tank capacity is ensured, the height h of the deck strong beam is required to be compressed as much as possible, so that the cross section design proportion of the deck strong beam is unreasonable, the cross section area is increased, the structural weight is increased, and the initial investment and the performance of the ship are adversely affected.
As shown in fig. 4: assuming that the reasonable strong beam cross-sectional form is scheme 1, scheme 2 is a strong beam cross-sectional form that is highly constrained by the limitation of the air height, h2< h1, but in order to ensure the same stiffness, w2 × t2> w1 × t1 and the whole beam cross-sectional area a2> a 1. It should be noted that the compression of the height of the beam is also limited, and the height of the beam cannot be reduced at once.
At present, the demand of China on inland river LNG transport ships is gradually increased, the LNG transport ships or filling ships belong to liquefied gas ships, the cargo tank types can be adopted, and the requirement of specifications on the height of a ventilating mast needs to be met. The great-capacity bridge has the advantages that the inland rivers represented by Yangtze rivers in China are all covered by a plurality of bridges, the air height of the inland rivers is limited to a certain extent, the cargo tank height is made as large as possible, the cabin capacity is made as large as possible on the premise that the standard and the bridge-crossing air height limit are met, the transportation efficiency is improved, and the transportation economy is improved.
In addition, insulation is typically applied to the surface of the cargo tank, and in order to maintain the insulating effect of the insulation, it is often necessary for personnel to be able to view the condition of the insulated surface in the field. The observation can be made through the inner bottom passage and the side inspection platform at the bottom and the side of the cargo tank. However, it is often difficult for personnel to reach the top of the tank, and the existing method is basically to open several manholes on the deck of the top of the cargo hold, so that personnel can go down to the upper surface of the tank to observe the insulation condition of the upper surface of the tank. Because the upper part of the cargo tank is provided with a large number of structures of deck strong beams, the personnel can move back and forth difficultly, and the observation on the upper surface of the cargo tank is inconvenient.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: under the requirement of certain altitude, the limit influence of structures such as a deck strong beam of a liquefied gas ship on the height of a cargo tank is reduced through special structural design, so that the cross section area of the cargo tank is increased to the maximum extent under the condition of a given ship size, the hold capacity of the cargo tank is increased, the design constraints of the structures such as the deck strong beam are released, and more optimized section forms and proportions can be applied. In addition, by introducing the deck structure form, a more convenient observation mode is provided for observing the upper surface of the cargo tank.
In order to achieve the aim, the technical scheme of the invention provides a deck structure of a liquefied gas ship, wherein a ventilating mast is arranged on a weather deck, and a cargo hold is arranged below the weather deck and comprises deck strong cross beams, deck longitudinal girders and deck aggregates;
the weather deck is provided with deck strong beams, deck longitudinal girders and deck aggregates, and the bottom of the weather deck is of a smooth flat plate structure;
the deck longitudinal girders and the deck aggregates are arranged along the length direction of the ship body, and the deck strong cross beams are connected with and vertical to the deck longitudinal girders.
Preferably, the plurality of deck stringers are provided, and the deck aggregate is provided between two adjacent deck stringers.
Preferably, corners on two sides of the top of the cargo hold are top side hold areas; the heights of the two ends of the deck strong beam are gradually reduced, and the deck strong beam smoothly transits above the top side cabin area.
Preferably, a longitudinal strengthening member under the deck is arranged between the weather deck and the cargo hold, and comprises an inner shell longitudinal bulkhead and a top side cabin longitudinal truss.
Preferably, the longitudinal strong member under the deck is arranged right below the deck strong cross beam.
Preferably, a cargo tank is arranged in the cargo hold; the top of the cargo hold is provided with a lower longitudinal deck rail, a rail trolley is movably arranged on the lower longitudinal deck rail, and a camera used for observing the cargo tank is arranged on the rail trolley.
Preferably, the under-deck longitudinal rail is a T-shaped truss.
Preferably, the deck aggregates, the deck stringers and the deck strong cross beams are provided with drain holes for draining water.
Preferably, liquid cargo equipment is arranged on the deck strong cross beams and/or the deck longitudinal girders.
Preferably, a cargo compressor and a refrigeration compressor are arranged on the deck strong beam.
In summary, the invention has the following beneficial technical effects:
by applying the technical scheme provided by the invention, the influence of the liquefied gas carrier air height limit on the height of the cargo tank is reduced, and a deck structure form with larger cargo tank volume and lighter weight can be designed under the condition of certain ship type dimension. In addition, the invention also provides a safer and more convenient insulation monitoring mode for the upper surface of the cargo tank.
For the liquefied gas carrier which has more bridge-crossing limitation and sails in inland river basin such as Yangtze river, the introduction of the invention can improve the transportation efficiency and the economic benefit and the safety of the ship type.
Drawings
FIG. 1 is a typical cross-sectional layout of a dual-cylinder C-type individual tank of the prior art;
FIG. 2 is a typical cross-sectional layout of a plurality of single cylindrical C-shaped individual tanks of the prior art;
FIG. 3 is a typical cross-sectional layout of a ventilated mast-type stand-alone tank of the prior art;
FIG. 4 is a cross-sectional comparison view of the prior art deck beam with different web heights;
FIG. 5 is a cross-sectional view of a deck structure of a liquefied gas carrier of the present invention;
FIG. 6 is a side view of the deck structure of a liquefied gas carrier of the present invention;
FIG. 7 is a top view of the deck structure of a liquefied gas carrier of the present invention;
FIG. 8 is a schematic view of the underdeck camera track cart of the present invention;
fig. 9 is a schematic view of the underdeck camera trolley of fig. 8 taken along direction a-a.
Reference numerals: 1. a cargo tank; 2. a ventilated mast; 3. an open deck; 4. a deck strong beam; 5. a deck stringer; 6. the deck skeleton material; 7. a camera; 8. a rail trolley; 9. a lower deck longitudinal rail.
Detailed Description
The main idea of the invention is to change the strong beam of the weather deck of the liquefied gas carrier from the conventional arrangement under the deck to the arrangement on the deck, as shown in the attached fig. 5 to 9.
First, the deck application area is a cargo hold area of a liquefied gas carrier, and a ventilation mast 2 of the liquefied gas carrier is arranged on a deck of the cargo hold area. According to the standard requirement, the height of the ventilating mast 2 of the liquefied gas carrier is measured up by the weather deck 3, deck structures such as a deck strong beam 4 and the like are turned over to be above the weather deck 3, the calculation of the height of the ventilating mast 2 cannot be influenced, and the height of the ventilating mast 2 can be the same as the scheme of arranging the strong beam under the deck. Thus, when the altitude is limited to a certain level, the height of the weather deck 3 provided with the strong beam scheme on the deck can be the same as the height of the strong beam scheme provided under the deck. However, after the deck strong cross beams 4 are turned upwards, the upper boundary of the cargo tank 1 is only limited by the weather deck 3, and the influence of the original deck strong cross beams 4 on the height of the cargo tank 1 is avoided.
In addition, after the deck strong cross beams 4 and other structures are turned upwards, no design constraint on the heights of the deck strong cross beams is provided, and the deck strong cross beams 4 can be selected in more reasonable section forms and proportions.
The deck auxiliary reinforcing structure provided with the strong beam scheme on the deck is arranged on the weather deck 3 and mainly comprises deck strong beams 4, deck stringers 5 and deck aggregates 6. A multi-gear deck strong beam 4 is arranged on the weather deck 3 along the ship length direction, the height of webs at two ends of the deck strong beam 4 is gradually reduced, the deck strong beam is in oblique transition in a top side cabin area, and if the area of a passage in the nearby area is tight, the end part of a panel can be enlarged and is aligned with a strong member in the top side cabin. The transverse range of the deck strong beam 4 should cover the transverse position of the longitudinal strong members (such as inner shell longitudinal bulkheads, roof side tank longitudinal girders and the like) under the deck.
By adjusting the distance appropriately, the deck girder 4 or the deck stringer 5 can be used as a base for cargo equipment such as cargo compressors disposed in the cargo compartment area. In the compressor room area, the deck strong beam 4 is properly adjusted and can be used as a base of a cargo compressor and a refrigeration compressor. The deck aggregates 6, the deck stringers 5 and the deck strong beams 4 are provided with water flow holes with enough areas so as to ensure the drainage of the weather deck 3.
On the other hand, in order to solve the problem that the upper surface of the cargo tank 1 is difficult to observe, by combining the scheme of turning up the structures such as the deck strong beam 4 and the like provided by the invention, the lower part of the cargo tank deck is already of a smooth flat plate structure without the blocking of a transverse structure, a T-shaped truss penetrating back and forth is arranged at a longitudinal position in the ship under the deck as a longitudinal rail 9 under the deck, the longitudinal rail 9 under the deck in each cargo tank is longitudinally arranged and is continuous in the cargo tank, a rail trolley 8 and a camera 7 are arranged on the longitudinal rail 9 under the deck, the rail trolley 8 on the longitudinal rail 9 under the deck can move the camera 7 back and forth along the ship length direction, and the insulation condition of the upper surface of the cargo tank 1 can be observed in a far-side manner in real time.
The above are preferred embodiments of the present invention, and not intended to limit the scope of the present invention, so that equivalent changes in structure, shape and principle of the present invention should be covered by the present invention.
Claims (10)
1. The utility model provides a liquefied gas ship deck structure is equipped with ventilative mast on the weather deck, and the weather deck has cargo hold, its characterized in that: comprises a deck strong beam, a deck longitudinal girder and deck aggregates;
the weather deck is provided with deck strong beams, deck longitudinal girders and deck aggregates, and the bottom of the weather deck is of a smooth flat plate structure;
the deck longitudinal girders and the deck aggregates are arranged along the length direction of the ship body, and the deck strong cross beams are connected with and vertical to the deck longitudinal girders.
2. A liquefied gas carrier deck structure as claimed in claim 1, wherein: the deck stringers are arranged in a plurality of numbers, and deck aggregates are arranged between two adjacent deck stringers.
3. A liquefied gas carrier deck structure as claimed in claim 1, wherein: the corners at two sides of the top of the cargo hold are top side hold areas; the heights of the two ends of the deck strong beam are gradually reduced, and the deck strong beam smoothly transits above the top side cabin area.
4. A liquefied gas carrier deck structure as claimed in claim 1, wherein: a longitudinal strong member under the deck is arranged between the weather deck and the cargo hold and comprises an inner shell longitudinal bulkhead and a roof side cabin longitudinal truss.
5. A liquefied gas carrier deck structure as claimed in claim 4, wherein: the lower longitudinal strong member of the deck is arranged below the transverse coverage range of the strong cross beam of the deck.
6. A liquefied gas carrier deck structure as claimed in claim 1, wherein: a cargo tank is arranged in the cargo hold; the top of the cargo hold is provided with a lower longitudinal deck rail, a rail trolley is movably arranged on the lower longitudinal deck rail, and a camera used for observing the cargo tank is arranged on the rail trolley.
7. A liquefied gas carrier deck structure as claimed in claim 6, wherein: the longitudinal rail under the deck is a T-shaped truss.
8. A liquefied gas carrier deck structure as claimed in claim 1, wherein: and the deck aggregates, the deck stringers and the deck strong cross beams are provided with drain holes for draining water.
9. A liquefied gas carrier deck structure as claimed in claim 1, wherein: and liquid cargo equipment is arranged on the deck strong cross beam and/or the deck longitudinal girder.
10. A liquefied gas carrier deck structure as claimed in claim 1, wherein: and the deck strong beam is provided with a cargo compressor and a refrigeration compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111455080.6A CN114104188A (en) | 2021-12-01 | 2021-12-01 | Liquefied gas ship deck structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111455080.6A CN114104188A (en) | 2021-12-01 | 2021-12-01 | Liquefied gas ship deck structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114104188A true CN114104188A (en) | 2022-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111455080.6A Pending CN114104188A (en) | 2021-12-01 | 2021-12-01 | Liquefied gas ship deck structure |
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| CN (1) | CN114104188A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06293384A (en) * | 1993-04-06 | 1994-10-21 | Mitsubishi Heavy Ind Ltd | Automatically inspecting device for spherical tank of lng carrier |
| KR20110058226A (en) * | 2009-11-26 | 2011-06-01 | 삼성중공업 주식회사 | Insulation system inspect apparatus |
| CN104960633A (en) * | 2015-06-15 | 2015-10-07 | 中远船务工程集团有限公司 | Tank type LNG container transporting ship |
| WO2016039564A1 (en) * | 2014-09-12 | 2016-03-17 | 현대중공업 주식회사 | Apparatus and method for detecting defects in triplex bonding in lng carrier |
| CN111619729A (en) * | 2020-05-29 | 2020-09-04 | 广船国际有限公司 | Ship cargo hold strong frame arrangement mode |
| CN112356972A (en) * | 2020-11-19 | 2021-02-12 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Liquefied natural gas transport ship and liquefied natural gas transport system |
-
2021
- 2021-12-01 CN CN202111455080.6A patent/CN114104188A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06293384A (en) * | 1993-04-06 | 1994-10-21 | Mitsubishi Heavy Ind Ltd | Automatically inspecting device for spherical tank of lng carrier |
| KR20110058226A (en) * | 2009-11-26 | 2011-06-01 | 삼성중공업 주식회사 | Insulation system inspect apparatus |
| WO2016039564A1 (en) * | 2014-09-12 | 2016-03-17 | 현대중공업 주식회사 | Apparatus and method for detecting defects in triplex bonding in lng carrier |
| CN104960633A (en) * | 2015-06-15 | 2015-10-07 | 中远船务工程集团有限公司 | Tank type LNG container transporting ship |
| CN111619729A (en) * | 2020-05-29 | 2020-09-04 | 广船国际有限公司 | Ship cargo hold strong frame arrangement mode |
| CN112356972A (en) * | 2020-11-19 | 2021-02-12 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Liquefied natural gas transport ship and liquefied natural gas transport system |
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Application publication date: 20220301 |