Liftable independent cargo hold structure for ships

Abstract

The present invention discloses a liftable independent cargo hold structure for a ship, comprising an independent liquid cargo tank; the independent liquid cargo tank is arranged inside the cargo hold; the top of the cargo hold is an open portion; a hatch coaming is provided around the open portion; the hatch coaming is fixed to the top of the hull structure; a hull reinforcement member and a cover are provided on the outside of the liquid cargo tank hull; the cover is fixed to the hull reinforcement member; the cover extends above the hatch coaming; a seal is provided between the cover and the hatch coaming; and a support member and a limit device are provided between the hull structure and the independent liquid cargo tank. The present invention maximizes the use of the space inside the cabin and the top space, has a high utilization rate of the hull space, and is conducive to reducing the ship's draft. It can significantly reduce the light ship weight, lower the ship's construction cost, and increase the ship's cargo capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a liftable independent cargo hold structure for ships. Background Art

[0002] For bulk liquid chemical tankers transporting highly corrosive cargoes, such as hydrochloric acid solutions with a concentration exceeding 20%, the IBC Code requires the use of independent liquid cargo tanks to prevent these highly corrosive liquid cargoes from corroding the hull structure and affecting ship safety. Conventional ship designs employ a single-bottom double-hull design, or a double-bottom single-hull design, with a complete main deck structure. The independent liquid cargo tanks are located in cofferdams below the main deck and are limited by top and bottom limiters. The main problem with conventional ship designs with independent liquid cargo tanks is that although the independent liquid cargo tanks are coated with rubber or plastic, due to construction technology and material aging, corrosive liquids will still corrode the independent liquid cargo tanks after a period of time. At this time, the independent liquid cargo tanks need to be hoisted out for maintenance or even replacement. Since the independent liquid cargo tanks are located below the main deck, the main deck structure of the hull and the accessories on the main deck need to be completely dismantled when hoisting the independent liquid cargo tanks out, which causes serious damage to the hull structure. After the independent cargo tanks are maintained, they need to be hoisted back into the empty compartment of the ship and then sealed with a new main deck structure. The entire maintenance process is difficult to construct, costly, and time-consuming. In addition, the hull deck structure needs to be re-welded after being damaged, and the process is not as good as the original continuous deck structure.

[0003] Disadvantages of existing technology:

[0004] 1. The entire construction and maintenance process is difficult, requiring the dismantling of the main deck structure for maintenance;

[0005] 2. High maintenance cost and complicated construction process, requiring welding of a new main deck structure after maintenance;

[0006] 3. The main deck structure was severely damaged. Usually, ships are designed with a complete and continuous main deck structure. After the main deck was cut off and re-welded, the continuity of the deck structure was destroyed in the process. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a liftable independent cargo hold structure for ships.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] A liftable independent cargo hold structure for a ship, comprising an independent liquid cargo tank; the independent liquid cargo tank comprises a liquid cargo tank shell; the independent liquid cargo tank is arranged in a cargo hold surrounded by a hull structure; the top of the cargo hold is an open portion; a hatch coaming is arranged around the open portion; the hatch coaming is fixed to the top of the hull structure; a shell reinforcement member for reinforcing the structural strength of the liquid cargo tank shell and a cover plate for covering the area between the side of the liquid cargo tank shell and the hull structure are provided on the outside of the liquid cargo tank shell; the cover plate is fixed to the shell reinforcement member; the cover plate extends to above the hatch coaming; a sealing member is provided between the cover plate and the hatch coaming; a supporting member for supporting the independent liquid cargo tank and a limiting device for limiting the movement of the independent liquid cargo tank are provided between the hull structure and the independent liquid cargo tank.

[0010] The hatch coaming and the seal are distributed circumferentially along the top of the cargo hold, and the cover is distributed circumferentially along the liquid cargo tank shell; the seal is fixed to the cover and the hatch coaming at the same time.

[0011] The seal and the cover are detachably connected; or the seal and the hatch coaming are detachably connected; or both the seal and the cover, and the seal and the hatch coaming are detachably connected.

[0012] The detachable connection is a bolt connection.

[0013] The seal is a watertight rubber strip.

[0014] The limiting device includes a vertical limiting device for limiting the vertical movement of the independent liquid cargo tank; the vertical limiting device includes a first vertical limiting component fixed to the hull structure and a second vertical limiting component fixed to the independent liquid cargo tank, and the second vertical limiting component is located below the first vertical limiting component; the first vertical limiting component is fixed on the lateral member of the hull structure.

[0015] The second vertical limiting component is fixed to the shell reinforcement member.

[0016] Vertical limit devices are provided on both the left and right sides of the independent liquid cargo tank.

[0017] The limiting device includes a transverse limiting device for limiting the transverse movement of the independent liquid cargo tank; the transverse limiting device includes a transverse limiting block fixed to the hull structure and a protruding block provided at the bottom of the independent liquid cargo tank, there are two transverse limiting blocks, and the protruding block is sandwiched between the two transverse limiting blocks.

[0018] The protruding block is fixed to the shell reinforcement component.

[0019] The supporting component is located below the bottom of the independent liquid cargo tank, and the supporting component is fixed to the bottom component of the hull structure.

[0020] The beneficial effects of the present invention are as follows: the independent cargo hold structure of a ship that can be lifted out of the present invention saves steps in construction, simplifies the construction process, and reduces the difficulty of construction. During later maintenance, the independent liquid cargo tank can be directly lifted out from the hull, and the independent liquid cargo tank can be maintained or replaced without dismantling the main deck structure. It is simple and convenient, and the construction is safer and simpler. After maintenance, the independent liquid cargo tank can be directly lifted into the cargo hold for installation, without the need for main deck sealing welding, which effectively reduces maintenance costs; the process will not destroy the continuity of the deck structure. The independent cargo hold structure of a ship that can be lifted out of the present invention maximizes the use of the space inside the cabin and the top space, and the cross-sectional shape has a high utilization rate of the hull space, which is conducive to reducing the ship's depth. This structure can greatly reduce the weight of the empty ship, reduce the cost of ship construction, and increase the ship's cargo capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of a preferred embodiment of the present invention.

[0022] Figure 2 for Figure 1 Enlarged schematic diagram of part A.

[0023] Figure 3 for Figure 1 Enlarged schematic diagram of part B.

[0024] Figure 4 Schematic diagram of the connection structure between the cover plate and the hatch coaming according to a preferred embodiment of the present invention.

[0025] Figure 5 Schematic diagram of the hull structure of a preferred embodiment of the present invention.

[0026] Figure 6 Schematic diagram of an independent liquid cargo tank according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0027] A preferred embodiment is given below and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0028] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, a liftable independent cargo hold structure for a ship includes an independent liquid cargo tank 10; the independent liquid cargo tank includes a liquid cargo tank shell 11; the independent liquid cargo tank 10 is disposed within a cargo hold 21 enclosed by a hull structure 20; the cargo hold 21 has an open top; a hatch coaming 22 is disposed around the open top; the hatch coaming 22 is fixed to the top of the hull structure. The tops of the hatch coamings are located at the same height.

[0029] The outside of the liquid cargo tank shell 11 is provided with a shell reinforcement member 12 for strengthening the structural strength of the liquid cargo tank shell and a cover plate 13 for covering the area between the side of the liquid cargo tank shell and the hull structure; the cover plate 13 is fixed to the shell reinforcement member 12; the cover plate 13 extends to above the hatch coaming 22.

[0030] A seal 23 is provided between the cover plate 13 and the hatch coaming 22. The seal is used to ensure that the cover plate and the hatch coaming remain watertight. In the present embodiment, the seal 23 is a watertight rubber strip.

[0031] The hatch coaming 22 and the seal 23 are both distributed circumferentially along the cargo hold top, and the cover plate 13 is distributed circumferentially along the cargo tank shell 11 ; the seal 23 is fixed to both the cover plate 13 and the hatch coaming 22 .

[0032] The connection between the sealing member and the cover plate and the connection between the sealing member and the hatch coaming, wherein at least one of the connection modes is a detachable connection.

[0033] Specifically, the seal 23 and the cover plate 13 are detachably connected; or, the seal 23 and the hatch coaming 22 are detachably connected; or, both the seal and the cover plate and the seal 23 and the hatch coaming 22 are detachably connected.

[0034] In this embodiment, the sealing member 23 and the cover plate 13, as well as the sealing member 23 and the hatch coaming 22 are both detachably connected; the detachable connections are bolt connections.

[0035] A limiting device is provided between the hull structure 20 and the independent liquid cargo tank 10 for limiting the movement of the independent liquid cargo tank.

[0036] The limiting device includes a vertical limiting device 30 for limiting the vertical movement of the independent liquid cargo tank.

[0037] The vertical limiting device 30 includes a first vertical limiting component 31 fixed to the hull structure and a second vertical limiting component 32 fixed to the independent liquid cargo tank. The second vertical limiting component 32 is located below the first vertical limiting component 31 .

[0038] The first vertical limiting member 31 is fixed to the lateral member of the hull structure 20. In this embodiment, the lateral member of the hull structure is the inner hull 24, and the first vertical limiting member 31 is fixed to the inner hull 24. The first vertical limiting member is a simple bracket structure.

[0039] The second vertical limiting component 32 is fixed to the housing reinforcement member 12 .

[0040] Vertical limiting devices 30 are provided on both the left and right sides of the independent liquid cargo tank 10 .

[0041] The limiting device includes a transverse limiting device 40 for limiting the lateral movement of the independent liquid cargo tank. The transverse limiting device 40 includes a transverse limiting block 41 fixed to the hull structure and a raised block 42 provided on the bottom of the independent liquid cargo tank. There are two transverse limiting blocks 41, with the raised block 42 sandwiched between the two transverse limiting blocks 41. The raised block 42 is fixed to the hull reinforcement member 12.

[0042] A support member 50 is provided between the hull structure 20 and the independent cargo tank 10 for supporting the independent cargo tank. The support member 50 is located below the bottom of the independent cargo tank 10 and is affixed to the bottom member of the hull structure 20. In this embodiment, the bottom member of the hull structure is the bottom support frame 25, to which the support member 50 is affixed.

[0043] In this technical solution, the shell reinforcement member of the independent liquid cargo tank is located outside the liquid cargo tank shell. The inner wall of the independent liquid cargo tank is flat and the welds have smooth rounded transitions, which makes it easy to apply rubber or plastic coating. A grooved bulkhead is provided in the middle to divide the liquid cargo tank into two left and right compartments.

[0044] When the independent liquid cargo tank needs to be lifted out for maintenance or even replacement, the independent liquid cargo tank can be lifted out smoothly by simply removing the seal between the cover plate and the hatch coaming and removing the first vertical limiting component.

[0045] After the independent liquid cargo tank is maintained outside the ship, it can be hoisted into the cargo hold, and the first vertical limiting component can be re-fixed. After the seal is fixed between the cover plate and the hatch coaming, the independent liquid cargo tank can be restored to its original state.

[0046] The liftable independent cargo hold structure of the present invention not only meets the requirements of laws and conventions, but also ensures the independence between the independent cargo hold and the hull structure. The deformation of the hull during navigation will not affect the independent liquid cargo hold.

[0047] The present invention's removable independent cargo tank structure saves construction steps, simplifies the construction process, and reduces construction difficulty. During later maintenance, the independent tank can be lifted directly from the hull, allowing for maintenance or replacement without dismantling the main deck structure. This is simple and convenient, and the construction is safer and simpler. After maintenance, the independent tank can be directly lifted into the cargo hold for installation, eliminating the need for welding to seal the main deck, effectively reducing maintenance costs and ensuring the continuity of the deck structure is not compromised.

[0048] The present invention's liftable independent cargo hold structure maximizes the use of both interior and overhead space. Its cross-sectional shape maximizes hull space utilization, helping to reduce the ship's draft. This structure can significantly reduce the empty ship's weight, lower ship construction costs, and increase the ship's cargo capacity.

[0049] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A liftable independent cargo hold structure for a ship, comprising an independent liquid cargo tank; the independent liquid cargo tank comprises a liquid cargo tank shell; the independent liquid cargo tank is arranged in a cargo hold surrounded by a hull structure; and the structure is characterized in that: The top of the cargo hold is an open part; a hatch coaming is provided around the open part; the hatch coaming is fixed to the top of the hull structure; the outside of the liquid cargo tank shell is provided with a shell reinforcement member for strengthening the structural strength of the liquid cargo tank shell and a cover plate for covering the area between the side of the liquid cargo tank shell and the hull structure; The cover plate is fixed to the shell reinforcement member; the cover plate extends to the top of the hatch coaming; a seal is provided between the cover plate and the hatch coaming; a support component for supporting the independent liquid cargo tank and a limiting device for limiting the movement of the independent liquid cargo tank are provided between the hull structure and the independent liquid cargo tank; the limiting device includes a vertical limiting device for limiting the vertical movement of the independent liquid cargo tank; the vertical limiting device includes a first vertical limiting component fixed to the hull structure and a second vertical limiting component fixed to the independent liquid cargo tank, the second vertical limiting component is located below the first vertical limiting component; the first vertical limiting component is fixed to the lateral member of the hull structure; the limiting device includes a transverse limiting device for limiting the transverse movement of the independent liquid cargo tank; the transverse limiting device includes a transverse limiting block fixed to the hull structure and a protruding block provided at the bottom of the independent liquid cargo tank, there are two transverse limiting blocks, and the protruding block is sandwiched between the two transverse limiting blocks.

2. The liftable independent cargo hold structure for a ship according to claim 1, characterized in that: The hatch coaming and the seal are distributed circumferentially along the top of the cargo hold, and the cover is distributed circumferentially along the liquid cargo tank shell; the seal is fixed to the cover and the hatch coaming at the same time.

3. The liftable independent cargo hold structure for a ship according to claim 2, characterized in that: The seal and the cover are detachably connected; or the seal and the hatch coaming are detachably connected; or both the seal and the cover, and the seal and the hatch coaming are detachably connected.

4. The liftable independent cargo hold structure for a ship according to claim 3, characterized in that: The detachable connection is a bolt connection.

5. The liftable independent cargo hold structure for a ship according to claim 1, characterized in that: The seal is a watertight rubber strip.

6. The liftable independent cargo hold structure for a ship according to claim 1, characterized in that: The second vertical limiting component is fixed to the shell reinforcement member.

7. The liftable independent cargo hold structure for a ship according to claim 1, characterized in that: Vertical limit devices are provided on both the left and right sides of the independent liquid cargo tank.

8. The liftable independent cargo hold structure for a ship according to claim 1, characterized in that: The protruding block is fixed to the shell reinforcement component.

9. The liftable independent cargo hold structure for a ship according to claim 1, characterized in that: The supporting component is located below the bottom of the independent liquid cargo tank, and the supporting component is fixed to the bottom component of the hull structure.

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