Independent storage cabin saddle capable of stopping floating

Abstract

An independent storage cabin is arranged on the saddle, the saddle at the end, close to a bow, of the independent storage cabin is a movable saddle, the saddle at the end, close to a stern, of the independent storage cabin is a fixed saddle, the movable saddle and the fixed saddle are provided with supporting structures, and each supporting structure sequentially comprises a reinforcing base plate, a web plate and a transition flange from top to bottom. The supporting structure supports the independent storage cabins, and the lower portion of the supporting structure is fixed to the ship body structure through laminated wood. A plurality of floating stopping components are symmetrically arranged on the two sides of the movable saddle and the two sides of the fixed saddle, each floating stopping component comprises a connecting bolt and a nut, and the two ends of each connecting bolt penetrate through bolt holes in the hull structure and bolt holes in the transition flange respectively and are fixed through the nuts. A floating stopping device and a ship body reinforcing structure which are independently arranged are omitted, and on the basis that the requirement for supporting the tank body and the liquid cargo load is met, the buoyancy borne by the tank body under the accidental water inflow working condition is balanced, the structural stress is optimized, the structural weight is reduced, and the construction period is shortened.

Description

Technical Field

[0001] The invention belongs to the field of construction and design of shipping LNG storage tanks, and in particular relates to an independent storage tank saddle capable of stopping floating. Background Art

[0002] Based on the transportation needs of LNG, LCO2, etc., independent tanks have been widely used in actual ship engineering. Independent tanks are connected to the hull structure through supporting saddles, which are used to transfer the tank and liquid cargo loads during normal operation of the ship to the hull structure; at the same time, to ensure the safety of the hull structure under accidental water inflow conditions, an anti-floating device is installed on the top of the tank to transfer the buoyancy of the tank to the hull structure. In current engineering applications, the tank saddle and the anti-floating device are designed separately, so it is necessary to design the hull support structure corresponding to the saddle and the anti-floating device.

[0003] At present, the commonly used anti-floating devices are all complex split-type welded structures with large welding volume and complex construction. For C-type tank LCO2 transport ships, due to the high density and pressure of LCO2, the diameter of the independent storage tank is usually limited; at the same time, in order to ensure the ship's load capacity and overall performance, the main scale of the structure is usually large, leaving a large gap between the independent storage tank and the hull structure. At this time, if the saddle and anti-floating device design method commonly used in engineering is adopted, the matching saddle and anti-floating device related structural parts will be very large, resulting in serious structural waste and increasing the complexity of the hull structure construction. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a buoyant independent tank saddle, which aims to balance the buoyancy of the tank under accidental water inflow conditions on the basis of supporting the tank and liquid cargo load, optimize the structural stress, reduce the structural weight, and shorten the construction period. The technical solution adopted is:

[0005] The utility model relates to a buoyant independent storage tank saddle, wherein the independent storage tank is placed on the saddle, the saddle at one end of the independent storage tank close to the bow is a movable saddle, and the saddle at one end of the independent storage tank close to the stern is a fixed saddle.

[0006] The movable saddle and the fixed saddle are both composed of a supporting structure, laminated wood and anti-floating components. Laminated wood is arranged between the supporting structure and the hull structure. The laminated wood is bonded to the supporting structure and the hull structure respectively. The anti-floating components are located on both sides of the laminated wood. The supporting structure is composed of a reinforced pad, a web and a transition flange from top to bottom. Reinforced elbow plates are fixed at equal intervals on both sides of the web. The reinforced pad is matched with the outer surface of the independent storage tank. The transition flange includes a straight section in the middle and inclined sections on both sides. The shape after the straight section and the inclined section are connected fits the hull structure.

[0007] Laminated wood is arranged between the transition flange of the fixed saddle and the hull structure, and limit baffles are fixed on both sides of the laminated wood. The limit baffles are divided into a first upper baffle and a first lower baffle. The top of the first upper baffle is fixed on the transition flange, and the bottom of the first lower baffle is fixed on the hull structure. There is a distance between the first upper baffle and the first lower baffle.

[0008] The supporting structure of the movable saddle is the same as that of the fixed saddle. The laminated wood of the movable saddle is divided into an upper laminated wood and a lower laminated wood. The width of the upper laminated wood is smaller than that of the lower laminated wood. A stainless steel plate is placed between the upper laminated wood and the lower laminated wood. The stainless steel plate is fixed to the lower laminated wood by bonding and rivets, and the upper laminated wood can slide along the stainless steel plate; a second upper baffle is fixed on both sides of the upper laminated wood, and a second lower baffle is fixed on both sides of the lower laminated wood. The width of the transition flange is greater than the width of the lower laminated wood and the reinforced pad.

[0009] A plurality of anti-floating components are arranged at equal intervals on the straight section of the transition flange of the movable saddle and the fixed saddle. The anti-floating components are located between two adjacent reinforcing brackets. The anti-floating components include connecting bolts and nuts. The two ends of the connecting bolts pass through the bolt holes on the hull structure and the transition flange respectively and are fixed by nuts. The bolt holes of the fixed saddle are circular, and the bolt holes of the movable saddle are strip-shaped. The length L of the strip-shaped bolt hole is increased by △L on the basis of the diameter of the circular bolt hole. △L is the cold shrinkage between the two saddles calculated according to the storage tank and the state of loading liquid cargo.

[0010] The above-mentioned independent buoyant tank saddle, further, has an angle α formed by the end of the web plate of 150~160°, a distance D1 between the end of the reinforced pad and the end of the reinforced bracket on the web plate of 100mm~200mm, and a distance D2 between the end of the transition flange and the end of the reinforced bracket plate of not less than 25mm; an angle γ formed between the boundary of the reinforced pad and the boundary of the web plate of 2.5°~5°, and a length A of the reinforced pad within the range of γ of not less than 100mm.

[0011] The above-mentioned independent buoyant storage tank saddle, further, has a spacing between the first upper baffle plate and the first lower baffle plate of 50 mm.

[0012] The above-mentioned independent buoyant tank saddle, further, has an angle β between the free edge of the bracket and the transition flange ranging from 45° to 90°.

[0013] The above-mentioned independent buoyant storage tank saddle further has the connecting bolts located at the center of two adjacent brackets.

[0014] The above-mentioned independent buoyant storage tank saddle, further, has a distance between adjacent connecting bolts of not less than 200 mm, a distance D5 between the bolt hole and the end of the transition flange of not less than 150 mm, and a distance D6 from the laminated wood baffle of not less than 50 mm.

[0015] The above-mentioned independent buoyant storage tank saddle, further, is provided with an insulating gasket at the connection surface between the nut and the transition flange, and the height of the insulating gasket is 5mm~10mm.

[0016] The above-mentioned independent storage tank saddle capable of stopping floating, further, has a stainless steel sheet bonded under the insulating gasket at the lower end of the movable saddle nut, and the stainless steel gasket can slide between the transition flange.

[0017] The above-mentioned independent storage tank saddle capable of stopping floating, further, the first upper baffle plate, the first lower baffle plate, the second upper baffle plate, and the second lower baffle plate are bonded to laminated wood.

[0018] The above-mentioned independent buoyant storage tank saddle, further, has the same width of the laminated wood of the fixed saddle and the upper laminated wood of the movable saddle, which is B1, and the width of the lower laminated wood of the movable saddle is B2. The distances between the edge of the upper laminated wood and the edge of the lower laminated wood are D3 and D4 respectively, B2=B1+D3+D4, wherein △L +20mm ≤D3≤△L +30mm, and D4 is 20mm~30mm.

[0019] The beneficial effects of the present invention are:

[0020] 1. The saddle design can make full use of the hull structure and tank layout characteristics, set anti-floating wooden blocks on the tank saddle, and balance the buoyancy of the tank under accidental water inflow conditions through connecting bolts, which greatly simplifies the design of the anti-floating device and cancels the additional anti-floating support reinforcement structure design of the hull, greatly reducing the structural weight of the saddle and anti-floating device, shortening the construction period and reducing the construction difficulty.

[0021] 2. The present invention balances the anti-floating load through the connecting bolts at the bottom of the tank body, rather than the traditional anti-floating device at the top of the tank body, so that the force path is shorter, the buoyancy of the tank body is more effectively balanced, and the influence of the additional anti-floating device on the top on the tank body design is avoided.

[0022] 3. Since there is no need to install an additional anti-floating device on the upper end of the tank, for LCO2 ships whose layout space is limited by the anti-floating device, space is provided for optimizing the cabin layout, which is conducive to improving the overall performance of the ship.

[0023] 4. The tank can be assembled with the supporting structure in advance and then directly hoisted and installed on the laminated wood of the hull structure, which improves the integration of the tank product;

[0024] 5. The final loading support structure can also serve as a temporary saddle during the tank construction phase and can be transported and installed together with the tank, eliminating the design of the temporary saddle and improving economic efficiency;

[0025] 6. The laminated wood is directly connected to the transition flange of the supporting structure and the hull structure. The laminated wood is arranged in a plane instead of the traditional curved surface along the surface of the tank, which reduces the construction difficulty and improves the efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of a fixed saddle with a floating stop member AA;

[0028] Figure 3 It is the schematic diagram of the cross-section structure of the movable saddle AA;

[0029] Figure 4 It is the top view structural diagram of the transition flange BB;

[0030] Figure 5 It is a schematic diagram of the bolt hole structure of the movable saddle;

[0031] Among them, 1-C type storage tank, 2-reinforced pad, 3-web, 4-elbow plate, 5-laminated wood, 6-first upper baffle, 7-first lower baffle, 8-second upper baffle, 9-second lower baffle, 10-upper laminated wood, 11-lower laminated wood, 12-hull structure, 13-transition flange, 14-connecting bolts, 15-nuts, 16-stainless steel plate, 17-insulating gasket. DETAILED DESCRIPTION

[0032] The present invention will be further described in conjunction with the accompanying drawings.

[0033] like Figure 1 The independent storage tank saddle shown is a buoyant independent storage tank, on which the independent storage tank is placed. The saddle at one end of the independent storage tank close to the bow is a movable saddle, and the saddle at one end close to the stern is a fixed saddle.

[0034] Both the movable saddle and the fixed saddle are composed of a supporting structure, laminated wood and anti-floating components. The anti-floating components are located on both sides of the laminated wood, such as Figure 1 As shown, the supporting structure of the fixed saddle includes an arc-shaped reinforcement pad, a transition flange and a web. The curvature of the reinforcement pad matches the curvature of the surface of the C-type tank. The reinforcement pad is concentric with the C-type tank and fits the surface of the C-type tank. The transition flange is continuously arranged below the reinforcement pad along the length direction of the reinforcement pad. The transition flange includes a straight section in the middle and inclined sections on both sides. The shape of the straight section and the inclined section after connection fits the hull structure.

[0035] In this embodiment, the wrap angle α formed by the web end is 156°, thereby ensuring the load transfer and structural safety between the independent storage tank and the saddle during the voyage of the ship. The wrap angle γ formed by the distance between the end of the reinforcement pad and the end of the web is 3.5°, and the length A of the reinforcement pad within the γ range is 450mm, which can meet the load transfer requirements while reducing the layout range of the laminated wood.

[0036] like Figure 2 As shown, laminated wood is arranged between the transition flange and the hull structure. The laminated wood is arranged along the entire length of the flange plate to transfer the tank load to the hull structure. The width of the laminated wood meets the pressure-bearing requirements of the independent tank to transfer the load, and at the same time, the insulation of the liquid cargo temperature is achieved. Limit baffles are fixed on both sides of the laminated wood. The laminated wood is bonded to the limit baffles and the transition flange. The limit baffles are continuously arranged from one end of the laminated wood to the other end. The limit baffles for fixing the saddle are divided into a first upper baffle and a first lower baffle. The top of the first upper baffle is fixed on the transition flange, and the bottom of the first lower baffle is fixed on the hull structure. There is a gap between the first upper baffle and the first lower baffle. The gap H between the first upper baffle and the first lower baffle is 50mm. The movement of the laminated wood along the length direction of the ship can be limited by the first upper baffle and the first lower baffle, thereby limiting the movement of the C-type tank along the length direction of the ship.

[0037] The width of the transition flange is greater than the width of the laminated wood and the reinforced pad. A web is fixed between the reinforced pad and the transition flange. Reinforced brackets are symmetrically fixed on both sides of the web. The reinforced brackets are right-angled trapezoids. The right-angled sides of the reinforced brackets are welded to the web. The brackets are used to reinforce the web to meet the load transfer requirements. In this embodiment, the laminated wood width B1 is 300mm, the reinforced bracket length L1 is 500mm, the bracket length L2 is 280mm, the angle β between the free edge of the bracket and the transition flange is 67°, and the distance D2 between the edge of the bracket and the edge of the transition flange is 25mm.

[0038] like Figure 3 As shown, the supporting structure of the movable saddle is the same as that of the fixed saddle. The laminated wood of the movable saddle is divided into an upper laminated wood and a lower laminated wood. The upper laminated wood is located on one side of the lower laminated wood. A stainless steel plate is placed between the upper laminated wood and the lower laminated wood. The stainless steel plate is fixed to the lower laminated wood by bonding and rivets. The upper laminated wood can slide along the stainless steel plate. The distance between each boundary of the stainless steel plate and the outer boundary of the lower laminated wood is 25mm. The stainless steel plate is used to reduce the friction resistance at the interface of the laminated wood, so as to facilitate the telescopic movement of the tank body along the length direction under temperature load. A second upper baffle is fixed on both sides of the upper laminated wood, and a second lower baffle is fixed on both sides of the lower laminated wood. The width of the transition flange is greater than the width of the upper laminated wood, the lower laminated wood and the reinforcing pad.

[0039] The width of the laminated wood of the fixed saddle is the same as that of the upper laminated wood of the movable saddle, which is 300 mm. In this embodiment, the shrinkage amount △L of the upper laminated wood along the lower laminated wood in the ship length direction obtained by temperature field analysis is 30 mm. Under normal temperature conditions, the distance D3 from the edge of the upper laminated wood to the edge of the lower laminated wood is 50 mm, and D4 is 20 mm, which can meet the telescopic movement requirements of the tank body along the ship length direction under temperature load.

[0040] like Figure 2 and Figure 4 As shown, a plurality of anti-floating components are arranged at equal intervals on the straight section of the transition flange of the movable saddle and the fixed saddle. The anti-floating components include connecting bolts and nuts. The two ends of the connecting bolts pass through the bolt holes on the hull structure and the transition flange respectively and are fixed by nuts. The connecting bolts are located at the center of two adjacent toggle plates, and the distance between adjacent connecting bolts is not less than 200mm. An insulating gasket is arranged at the connection surface between the nut and the transition flange. A stainless steel sheet is bonded under the insulating gasket at the lower end of the nut of the movable saddle, and the stainless steel gasket can slide between the transition flange. In this embodiment, the height of the insulating gasket is 5mm.

[0041] In this embodiment, the connecting bolts are used to provide the pulling force on the tank under the anti-floating condition, that is, the transition flange and the hull structure are connected by connecting bolts. In the case of accidental water inflow, the buoyancy of the C-type tank can be balanced by the pulling force of the connecting bolts, so there is no need to set up an additional anti-floating device. Figure 4 As shown, the bolt holes are arranged in the space formed by adjacent saddle support brackets, and the hull structure is bolted to the fixed end saddle support structure and the movable end saddle support structure.

[0042] When the distance between adjacent brackets on both sides is large, multiple bolts can be arranged, and the distance between adjacent bolts is not less than 200 mm. In this embodiment, one bolt is arranged at the center of adjacent brackets, and the distance D5 between the bolt hole and the edge of the transition flange is 200 mm, and the distance D6 from the limit baffle is 100 mm.

[0043] The bolt holes of the fixed saddle are circular, which limits the movement of the transition bolts here along the length of the ship. The bolt holes of the movable saddle are long strips, which do not limit the movement of the transition bolts here along the length of the ship. The bolt hole length L must meet the movement requirements of the tank body under the temperature load of the independent storage tank, so as to ensure the telescopic movement of the tank body along the length of the ship and ensure the tightness of the connection. In this embodiment, the diameter of the bolt hole of the fixed saddle section is 50mm, and the length L of the short bolt hole of the movable saddle increases the shrinkage △L of the tank body under the temperature load, that is, L is taken as 80mm. Figure 5As shown in the figure, under normal temperature, the limit state of the connecting bolt and the insulating wood block is the right end of the long strip bolt hole. After the storage tank is loaded with low-temperature liquid cargo, it shrinks under the temperature load and moves to the left end of the long strip bolt hole under the cold limit state. For example, at the connection point between the connecting bolt and the hull structure, when the hull cabin needs to be sealed, the bolt does not pass through the hull structure at this point, but is connected by welding.

[0044] The present invention provides an independent tank saddle with anti-floating function, which eliminates separately arranged anti-floating devices and hull reinforcement structures, balances the buoyancy of the tank under accidental water inflow conditions on the basis of satisfying the support for the tank body and liquid cargo load, optimizes the structural stress, and reduces the structural weight; the present invention designs the connection interface between the tank and the hull into a plane form, improves the integration of the tank, reduces the construction difficulty, and shortens the construction period; the integrated tank saddle provided by the present invention eliminates the temporary saddle in the tank construction stage, and improves the economy.

Claims

1. A buoyant independent storage tank saddle, characterized in that: The independent storage tank is placed on a saddle, the saddle near the bow end of the independent storage tank is a movable saddle, and the saddle near the stern end is a fixed saddle; The movable saddle and the fixed saddle are composed of a supporting structure, laminated wood and anti-floating components. Laminated wood is arranged between the supporting structure and the hull structure. The laminated wood is bonded to the supporting structure and the hull structure respectively. The anti-floating components are located on both sides of the laminated wood. The supporting structure is composed of a reinforced pad, a web and a transition flange from top to bottom. Reinforced brackets are fixed at equal intervals on both sides of the web. The reinforced pads are adapted to the outer surface of the independent storage tank. The transition flange includes a straight section in the middle and inclined sections on both sides. The shape of the straight section and the inclined section after connection fits the hull structure. An insulating layer is laid on the outside of the tank body, the outside of the web and the outside of the reinforced bracket. Laminated wood is arranged between the transition flange of the fixed saddle and the hull structure. The supporting structure of the movable saddle is the same as that of the fixed saddle. The laminated wood of the movable saddle is divided into an upper laminated wood and a lower laminated wood. The width of the upper laminated wood is smaller than that of the lower laminated wood. A stainless steel plate is placed between the upper laminated wood and the lower laminated wood. The stainless steel plate is fixed to the lower laminated wood by bonding and rivets. The upper laminated wood can slide along the stainless steel plate. The width of the transition flange is greater than that of the lower laminated wood and the reinforcing pad. A plurality of anti-floating components are arranged at equal intervals on the straight sections of the transition flanges of the movable saddle and the fixed saddle. The anti-floating components are located in the middle of two adjacent reinforced brackets. The anti-floating components include connecting bolts and nuts. Both ends of the connecting bolts pass through the bolt holes on the hull structure and the transition flange respectively and are fixed by nuts. The bolt holes of the fixed saddle are circular, and the bolt holes of the movable saddle are long strips.

2. The buoyant independent storage tank saddle according to claim 1, characterized in that: The wrap angle α formed at the end of the web is 150~160°, the distance D1 between the end of the reinforced pad and the end of the reinforced bracket on the web is 100mm~200mm, and the distance D2 between the end of the transition flange and the end of the reinforced bracket is not less than 25mm; the wrap angle γ formed between the boundary of the reinforced pad and the boundary of the web is 2.5°~5°, and the length A of the reinforced pad within the range of γ is not less than 100mm.

3. The buoyant independent storage tank saddle according to claim 1, characterized in that: The distance between the first upper baffle plate and the first lower baffle plate is 50 mm.

4. The buoyant independent storage tank saddle according to claim 1, characterized in that: The included angle β between the free edge of the reinforcing bracket and the transition flange ranges from 45° to 90°.

5. The buoyant independent storage tank saddle according to claim 1, characterized in that: The distance between adjacent connecting bolts shall not be less than 200mm, the distance D5 between the bolt hole and the end of the transition flange shall not be less than 150mm, and the distance D6 from the laminated wood baffle shall not be less than 50mm.

6. The buoyant independent storage tank saddle according to claim 1, characterized in that: An insulating gasket is arranged at the connection surface between the nut and the transition flange, and the height of the insulating gasket is 5mm~10mm.

7. The buoyant independent storage tank saddle according to claim 1, characterized in that: A stainless steel sheet is bonded under the insulating gasket at the lower end of the movable saddle nut, and the stainless steel gasket can slide between the transition flange.

8. The buoyant independent storage tank saddle according to claim 1, characterized in that: The width of the laminated wood of the fixed saddle is the same as the width of the upper laminated wood of the movable saddle, which is B1. The width of the lower laminated wood of the movable saddle is B2. The distances between the edge of the upper laminated wood and the edge of the lower laminated wood are D3 and D4 respectively. B2=B1+D3+D4, among which △L +20mm ≤D3≤△L +30mm, and D4 is 20mm~30mm.

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