Support structure for strength test of type c fuel tank of lng carrier

Abstract

The utility model relates to the field of ship construction provides LNG ship C type fuel tank strength test support structure. Including two support units, two support units support the reinforcing ring of C type fuel tank's both ends respectively, the support unit includes base and bracket, the base includes bottom plate, top plate and the vertical support plate welded between top plate and bottom plate, the bracket fixed mounting in the top plate, the bracket includes a pair of arc panel, a pair of the arc panel symmetrical distribution, and the arc panel and C type fuel tank's outside corresponding fit. The arc panel of bracket adopts the big angle of wrap -round of profiled gasket design, makes the support surface and C tank body perfect fit, and the panel and the under web and side plate are strengthened and fixed through the way of the web plate, guarantee its structure stability and the service life of bracket. Compared with prior art, the base has been treated to be enlarged and widened, the ground pressure is reduced, ground subsidence is avoided, and the foundation stability of the support system is fundamentally ensured.

Description

Technical Field

[0001] This utility model relates to the field of shipbuilding, specifically to a support structure for strength testing of C-type fuel tanks on LNG ships. Background Technology

[0002] With the booming development of the global chemical industry, the demand for liquid chemical tankers is also continuously increasing, and efficient and safe transportation methods are receiving more and more attention. Type C tanks (Type C independent cargo tanks), as a typical horizontal cylindrical or double-eared pressure vessel, have become core equipment in the land storage and maritime transportation (such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), and liquid ammonia) of media due to their excellent structural strength and space efficiency. Their manufacturing quality directly affects the safety and reliability of the entire storage and transportation system. Therefore, Type C tanks must undergo rigorous strength tests according to national and international standards to verify their pressure-bearing capacity, weld quality, and overall sealing performance.

[0003] During strength tests, especially hydrostatic tests, the tank must remain stable under operating pressure. At this time, the tank's support structure is crucial and must meet the following core requirements: 1. Accurately simulate actual working conditions, that is, reproduce as closely as possible the support constraints of the tank at its final installation location (such as a ship's saddle or land foundation), including the location of support points, wrap angles, and stress distribution, to ensure the accuracy of the test stress state; 2. Ensure absolute safety and stability, preventing any accidental movement, rolling, or overturning of the tank due to internal pressure fluctuations or external interference during pressurization, pressure holding, or pressure release; 3. Protect the tank body, avoiding mechanical damage or localized stress concentration to the outer wall of the tank (especially the usually applied anti-corrosion coating) caused by the support structure.

[0004] In existing technologies, simple tooling is commonly used for temporary support. The main methods and their problems are as follows: 1. Simple rigid supports / sleeper stacks: These use welded brackets or stacked blocks. They cannot accommodate the manufacturing tolerances, ellipticity, and uneven ground of the tank, resulting in insecure support and uneven stress. More seriously, the top support surface is usually flat or a simple curved surface, with extremely low conformity to the actual curvature of the tank's outer wall, forming "line contact" or extremely small area contact. This not only fails to simulate the "surface contact" form of a large-angle saddle support on a ship, altering the local stress distribution of the tank and distorting the experimental conditions, but also easily damages the tank's anti-corrosion coating and even causes localized plastic deformation due to excessively high contact pressure. 2. Narrow base design with a single function, essentially a consumable item for "tank-only" use: The currently used simple steel frames or sleeper stacks are designed only to "temporarily support the tank," lacking systematic consideration. Their bases are usually only the minimum dimensions required for their own standing, resulting in extremely high ground pressure. This design not only ignores the safety margin of the foundation's bearing capacity, but also makes the stability of the entire support structure completely dependent on the absolute flatness and solidity of the ground, resulting in extremely poor adaptability. Even slight unevenness or uneven bearing capacity of the ground can easily lead to tilting or settlement. More importantly, these support structures are strongly bound to specific tank dimensions; one set of supports can typically only be used for tanks of a specific diameter or length, making them non-universal. When the C-tank model changes, the old supports are often completely scrapped and need to be remanufactured. This is essentially a "tank-only" disposable consumable model, leading to high production costs, serious resource waste, and chaotic on-site storage.

[0005] In summary, existing technologies suffer from systemic defects such as "simulation distortion, poor base adaptability, low material utilization, and damage to the tank." Therefore, there is an urgent need for a dedicated temporary support solution that can accurately simulate the support configuration on board, provide rapid and precise leveling, ensure stability and reliability, and protect the tank. Summary of the Invention

[0006] In order to provide stable support for C-type independent fuel tanks during strength tests, reduce the risk of concentrated foundation loads, and avoid damage to the tank, this utility model provides a support structure for the strength test of C-type fuel tanks for LNG ships.

[0007] The technical solution adopted by this utility model is as follows: The strength test support structure for the C-type fuel tank of an LNG carrier includes two support units, which respectively support the reinforcing rings at both ends of the C-type fuel tank. Each support unit includes a base and a bracket. The base is supported on the ground, and the bracket is installed on the top surface of the base, supporting the corresponding reinforcing ring of the C-type fuel tank. The base includes a bottom plate, a top plate, and a vertical support plate welded between the top plate and the bottom plate. The bracket is fixedly installed on the top plate. The bracket includes a pair of arc-shaped panels, which are symmetrically distributed and correspond to the outer surface of the C-type fuel tank. A pair of side plates are provided on the outer side of the pair of arc-shaped panels. A web plate is welded to the bottom of the arc-shaped panels. The side plates and the web plate are welded to the top surface of the top plate. The top plate and the side plates are supported by multiple stiffeners. The stiffeners are distributed on both sides of the web plate and are simultaneously welded and fixed to the top plate, side plates, web plate, and arc-shaped panels. Arc-shaped laminated wood is installed on the inner surface of the arc-shaped panels, and the inner surface of the laminated wood is covered with a layer of putty.

[0008] Furthermore, a gap is provided between the two curved panels, and a protrusion corresponding to the gap is provided at the bottom center of the outer side of the laminated wood, and the protrusion cooperates with the gap to limit its position.

[0009] Furthermore, an upper cover plate is welded between the top surface of the side plate and the corresponding arc-shaped panel, and the upper cover plate extends along the length direction of the arc-shaped panel.

[0010] Furthermore, the stiffeners between the arc-shaped panel and the top plate are vertically arranged, and the stiffeners between the arc-shaped panel and the side plates are inclined towards the axial direction of the arc-shaped panel.

[0011] Furthermore, vertical end plates are welded to both ends of the vertical support plate of the base. The end plates are simultaneously welded vertically to the bottom plate, the top plate, and the support plate. Multiple equally spaced reinforcing plates are welded to both sides of the support plate. The top of the reinforcing plate is welded to the bottom surface of the top plate, the bottom surface of the reinforcing plate is welded to the top surface of the bottom plate, and the side surface of the reinforcing plate is welded to the side surface of the support plate.

[0012] Furthermore, the length of the base is greater than the width of the C-type fuel tank.

[0013] Furthermore, an ear plate extending along the length direction is welded to the top centerline of the top plate, and the web plate is welded to the ear plate.

[0014] After adopting the above technical solution, the beneficial effects of this utility model are as follows: The bracket's curved panel features a large-angle design with contoured padding, ensuring a perfect fit between the support surface and the C-tank body. The panel, along with the underlying web and side plates, is reinforced and secured with stiffeners to guarantee structural stability and the bracket's lifespan.

[0015] A pressure-bearing wooden board is placed between the curved panel and the C-type fuel tank. An epoxy putty layer is also added between the C-type fuel tank and the pressure-bearing wooden board to ensure that the curved support surface fits the tank body while also ensuring that the anti-corrosion coating of the tank body is not damaged and to avoid causing local plastic deformation.

[0016] Compared to existing technologies, the base has been enlarged and widened, increasing the contact area between the base and the ground, thus enhancing stability, significantly reducing grounding pressure, preventing ground settlement, and fundamentally ensuring the foundation stability of the support system. Both the base and the bracket incorporate numerous reinforcing ribs and plates, greatly ensuring the strength of the temporary support structure for strength tests, allowing the tests to proceed smoothly. Attached Figure Description

[0017] Figure 1 This is the front view of the present invention.

[0018] Figure 2 This is a side view of the present invention.

[0019] Figure 3 This is a schematic diagram illustrating the use of the supporting structure.

[0020] In the diagram: Support unit 1, base 11, bottom plate 111, top plate 112, support plate 113, end plate 114, ear plate 115, reinforcing plate 116, bracket 12, arc-shaped panel 121, side plate 122, web plate 123, stiffening plate 124, top cover plate 125, laminated wood 126, partition 127, protrusion 128, putty layer 129, C-type fuel tank 2, reinforcing ring 3. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings: As shown in the figure, the strength test support structure for the C-type fuel tank of an LNG ship consists of two identical support units 1. The two support units 1 support the reinforcing rings 3 at both ends of the C-type fuel tank 2, respectively, to simulate the saddle support of the C-type fuel tank 2 for strength testing.

[0022] The support unit 1 consists of two parts: a base 11 and a bracket 12. The base 11 serves as the foundation, placed on the ground and supporting the bracket 12, which in turn supports the C-type fuel tank.

[0023] The main structure of the base 11 consists of a bottom plate 111, a top plate 112, and a vertical support plate 113 welded between the top plate 112 and the bottom plate 111. The area of ​​the bottom plate 111 is larger than that of the top plate 112, and trapezoidal end plates 114 are welded to both ends of the bottom plate 111 and the top plate 112. The length of the bottom plate 111 is greater than the width of the C-type fuel tank 2. In this technical solution, the base 11 has been enlarged and widened compared with the prior art. It also uses Q235 steel plate, which increases the contact area between the base 11 and the ground, increases stability, greatly reduces grounding pressure, avoids ground settlement, and fundamentally ensures the foundation stability of the support system.

[0024] Multiple equally spaced reinforcing plates 116 are welded to both sides of the support plate 113. The top of the reinforcing plate 116 is welded to the bottom surface of the top plate 112, the bottom surface of the reinforcing plate 116 is welded to the top surface of the bottom plate 111, and the sides of the reinforcing plate 116 are welded to the sides of the support plate 113. The large number of reinforcing plates 116 ensures the strength of the temporary support structure for the strength test.

[0025] The bracket 12 supports the reinforcing ring 3 corresponding to the C-type fuel tank 2. The bracket 12 is fixedly or detachably installed on the top surface of the base 11. The bracket 12 includes a pair of arc-shaped panels 121, which are symmetrically distributed. The arc-shaped panels 121 adopt a large-angle wrapping design with contoured pads, corresponding to and fitting the outer side of the C-type fuel tank 2. A pair of side plates 122 are provided on the outer side of the pair of arc-shaped panels 121. A web plate 123 is welded to the bottom of the pair of arc-shaped panels 121. The web plate 123 is perpendicularly and cross-welded to the corresponding side plate 122. The bottom of the side plate 122 and the web plate 123 are welded to or supported on the top surface of the top plate 112 of the base 11. An ear plate 115 extending along its length is welded to the top centerline of the top of the top plate 112. The web plate 123 is supported or welded to the top surface of the ear plate 115.

[0026] The top plate 112 and side plates 122 support the arc-shaped panel 121 through multiple stiffeners 124. The stiffeners 124 are distributed on both sides of the web 123 and are welded and fixed to the top plate 112, side plates 122, web 123, and arc-shaped panel 121 to form a stable support. The stiffeners between the arc-shaped panel 121 and the top plate 112 are vertically arranged, while the stiffeners between the arc-shaped panel 121 and the side plates 122 are inclined towards the axis of the arc-shaped panel. A top cover plate 125 is welded between the top surface of the side plate 122 and the corresponding arc-shaped panel 121, and the top cover plate 125 extends along the length of the arc-shaped panel. An arc-shaped laminated wood 126 is installed on the inner side of the arc-shaped panel 121. A gap 127 is provided between the two arc-shaped panels 121. A strip-shaped protrusion 128 corresponding to the gap 127 is provided at the bottom center of the outer side of the laminated wood 126. The protrusion 128 cooperates with the gap 127 to limit its position. A layer of putty 129 is covered on the inner side of the laminated wood 126. The putty layer 129 is used to prevent the laminated wood 126 from abrading the outer insulation layer of the C-type fuel tank 2.

Claims

1. A strength test support structure for a C-type fuel tank of an LNG carrier, comprising two support units, each supporting a reinforcing ring at one end of the C-type fuel tank. Each support unit includes a base and a bracket. The base is supported on the ground, and the bracket is installed on the top surface of the base, supporting the corresponding reinforcing ring of the C-type fuel tank. The structure is characterized in that... The base includes a bottom plate, a top plate, and a vertical support plate welded between the top plate and the bottom plate. The bracket is fixedly installed on the top plate. The bracket includes a pair of arc-shaped panels, which are symmetrically distributed. The arc-shaped panels are correspondingly attached to the outer side of the C-type fuel tank. A pair of side plates are provided on the outer side of the pair of arc-shaped panels. A web plate is welded to the bottom of the arc-shaped panels. The side plates and web plate are welded to the top surface of the top plate. The top plate and side plates are supported by multiple stiffeners. The stiffeners are distributed on both sides of the web plate and are simultaneously welded and fixed to the top plate, side plates, web plate, and arc-shaped panels. Arc-shaped laminated wood is installed on the inner side of the arc-shaped panels. The inner side of the laminated wood is covered with a layer of putty.

2. The LNG ship C-type fuel tank strength test support structure according to claim 1, characterized in that, A gap is provided between the two curved panels, and a protrusion corresponding to the gap is provided at the bottom center of the outer side of the laminated wood. The protrusion cooperates with the gap to limit its position.

3. The LNG ship C-type fuel tank strength test support structure according to claim 1, characterized in that, A top cover plate is welded between the top surface of the side panel and the corresponding arc-shaped panel, and the top cover plate extends along the length direction of the arc-shaped panel.

4. The LNG ship C-type fuel tank strength test support structure according to claim 1, characterized in that, The stiffeners between the curved panel and the top plate are vertically arranged, while the stiffeners between the curved panel and the side plates are inclined towards the axial direction of the curved panel.

5. The LNG ship C-type fuel tank strength test support structure according to claim 1, characterized in that, Vertical end plates are welded to both ends of the vertical support plate of the base. The end plates are also welded vertically to the bottom plate, the top plate, and the support plate. Multiple equally spaced reinforcing plates are welded to both sides of the support plate. The top of the reinforcing plate is welded to the bottom surface of the top plate, the bottom surface of the reinforcing plate is welded to the top surface of the bottom plate, and the side surface of the reinforcing plate is welded to the side surface of the support plate.

6. The LNG ship C-type fuel tank strength test support structure according to claim 4, characterized in that, The length of the base is greater than the width of the C-type fuel tank.

7. The LNG ship C-type fuel tank strength test support structure according to claim 1, characterized in that, The top plate has an ear plate welded to its top centerline, extending along its length, and the web plate is welded to the ear plate.

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