Method for installing insulating layer of vertical support on inner side of bottom surface of B-type independent liquid cargo tank

Abstract

The invention provides a mounting method for insulating layers of bottom surface inner side vertical supports of a B-type independent liquid cargo tank, the bottom surface inner side vertical supports are mounted on two sides of a center line of the bottom surface of the liquid cargo tank along the length direction, and each bottom surface inner side vertical support comprises a mounting panel connected with the liquid cargo tank through a plurality of rib plates, a sole timber groove is formed in the bottom face of the mounting panel, sole timber is arranged in the sole timber groove, and the method mainly comprises the following steps that S1, a plurality of supporting cushion blocks are fixed to the outer surface of the liquid cargo tank; a heat preservation plate is laid on the outer side of the supporting cushion block, so that a gap is reserved between the heat preservation plate and the outer surface of the liquid cargo tank, and a leakage channel is formed. Aiming at the structural characteristics of the vertical support on the inner side of the bottom surface of the B-type independent liquid cargo tank, the insulation board and the perfusion foaming material are used as the insulation layer, tight installation of the insulation layer is ensured while the leakage channel is reserved, heat outside the liquid cargo tank is prevented from entering the liquid cargo tank, and the reliability of the liquid cargo tank is improved. And the problem of heat conduction at the vertical support on the inner side of the bottom surface is effectively solved.

Description

Technical Field

[0001] The invention relates to a method for installing an insulating layer of a vertical support on the inner side of the bottom surface of a B-type independent liquid cargo tank. Background Art

[0002] Liquefied gas carriers are special ships used to transport low-temperature liquid cargoes such as liquefied petroleum gas and liquefied natural gas. These liquid cargoes are loaded in the cargo tanks of liquefied gas carriers. Because the temperature of the liquid cargo is low, an insulation layer must be installed on the outer surface of the cargo tank. The main purpose of the cargo tank insulation layer is to prevent external heat from entering the interior of the cargo tank and reduce the evaporation of the liquid cargo. According to the type of loaded liquid cargo, the workplace and other aspects, the cargo tanks on liquefied gas carriers are divided into three types: Type A, Type B and Type C. Among them, the temperature of the liquid cargo in the Type B cargo tank is lower, and the Type B cargo tank has a small amount of liquid cargo leakage requirements, so a leakage channel must be set.

[0003] The structure of type B independent liquid cargo tank is complex, and there are many supporting structures connected to the bottom of the liquid cargo tank, such as anti-roll bearings, anti-pitch bearings, bottom vertical bearings, etc. Among them, the bottom of the type B independent liquid cargo tank is supported by four rows of vertical bearings. The inner vertical bearings of the bottom are installed on both sides of the centerline of the liquid cargo tank in the length direction of the hull, and the installation position of the outer vertical bearings of the bottom is at the edge of both sides of the centerline of the length direction of the liquid cargo tank. The contact area between the outer vertical bearings of the bottom and the liquid cargo tank is greater than the contact area between the inner vertical bearings of the bottom and the liquid cargo tank, and the load borne by the outer vertical bearings of the bottom is greater than the load borne by the inner vertical bearings of the bottom. The inner vertical bearings of the bottom play the role of assisting the outer vertical bearings of the bottom to support the liquid cargo tank. Regardless of the type of bearing, it needs to be wrapped with a thick insulation layer to prevent the liquid gas in the type B independent liquid cargo tank from being vaporized and lost due to the temperature rise. Prefabricated insulation panels can be used to splice the flat sections of Type B independent liquid cargo tanks without supports, but there are the following difficulties at the supports: 1. The support structure protrudes from the surface of the tank body and has ribs and laminated wood. The prefabricated insulation panels cannot be completely seamlessly spliced, which will cause the risk of temperature loss; 2. The upper ribs at the support are welded to the liquid cargo tank, and the low temperature of the liquid cargo tank can be directly transmitted to the laminated wood; 3. Type B independent liquid cargo tanks have leakage channel requirements, and the leakage channel needs to be retained to allow some of the leaked liquid to pour into a special leakage trough, so the method of pouring foam materials cannot be used entirely.

[0004] Therefore, there is a great need for an effective method for installing an insulation layer at the vertical support on the inner side of the bottom surface of a type B independent liquid cargo tank, which can achieve thermal insulation while ensuring that a small amount of leaked liquid can reach the corresponding storage purpose through the leakage channel. Summary of the invention

[0005] In view of the above defects, the present invention provides an installation method for the insulating layer of the vertical support on the inner side of the bottom surface of a Type B independent liquid cargo tank, which effectively solves the problem of heat conduction and temperature loss of the vertical support on the inner side of the bottom surface while reserving a leakage channel.

[0006] The present invention provides an installation method for the insulating layer of the vertical support on the inner side of the bottom surface of a Type B independent liquid cargo tank. The vertical support on the inner side of the bottom surface is installed on both sides of the center line along the length direction of the bottom surface of the liquid cargo tank. The vertical support on the inner side of the bottom surface includes a mounting panel connected to the liquid cargo tank through a plurality of rib plates. A packing groove is provided on the bottom surface of the mounting panel, and packing is provided in the packing groove. The method includes the following steps:

[0007] S1. A plurality of liquid tank surface packings are fixed on the outer surface of the liquid cargo tank, and height-adjustable support pads are provided under the liquid tank surface packings; a heat-insulating board is laid outside the support pads, so that there is a gap between the heat-insulating board and the outer surface of the liquid cargo tank to form a leakage channel;

[0008] S2. Grooves corresponding to the shapes of the rib plates are cut at the parts where the heat-insulating board contacts the vertical support on the inner side of the bottom surface, so that the rib plates are accurately embedded in the grooves of the heat-insulating board;

[0009] S3. A mold cavity including a frame and a bottom plate is made. A pouring port is provided on the mold cavity, and a through hole matching the pouring port is opened on the bottom plate. The mold cavity is sleeved on the packing from bottom to top and supported by a support member, ensuring that the bottom plate of the mold cavity is below the packing groove and does not contact the packing groove. The upper edge of the frame abuts against the outer surface of the heat-insulating board that has been laid. Then, foaming material is poured into the mold cavity through the pouring port, and the foaming material wraps the mounting panel, the packing groove, and the rib plates exposed outside the heat-insulating board;

[0010] S4. The mold cavity is filled with foaming material, and after the foaming material is cured, the mold cavity is demolded;

[0011] S5. After the mold cavity is demolded, a protective layer is installed on the outer surface of the cured foaming material to complete the installation of the insulating layer of the vertical support on the inner side of the bottom surface of the liquid cargo tank.

[0012] Preferably, in step S1, the liquid tank surface packings and the support pads are made of laminated wood.

[0013] Preferably, in step S1, a plurality of bolts are welded on the outer surface of the liquid cargo tank. The bolts sequentially pass through the support pads and the heat-insulating board, and the support pads and the heat-insulating board are fixed on the bolts through nuts.

[0014] Preferably, filling through holes are further provided in the heat-insulating board, and elastic materials are filled in the filling through holes.

[0015] Preferably, the elastic material is glass wool.

[0016] Preferably, the distance between the filling through - hole and the bolt is 10 - 15 mm.

[0017] Preferably, in step S1, the height of the leakage channel is 20 mm.

[0018] Preferably, in step S2, it further includes using a sealant to seal the joint between the insulation board and the rib plate.

[0019] Preferably, in step S4, it further includes: after demolding the mold cavity, setting sealants at the corner joints of the insulation board and the foaming material, and setting sealants at the corner joints of the foaming material and the wooden pad.

[0020] Preferably, in step S5, the protective layer is made of aluminum foil.

[0021] In view of the structural characteristics of the vertical support on the inner side of the bottom surface of the Type - B independent liquid cargo tank, the present invention uses both an insulation board and a poured foaming material as the insulation layer. While reserving a leakage channel, it ensures the tight installation of the insulation layer, preventing the heat outside the liquid cargo tank from entering the inside of the liquid cargo tank, and effectively solving the heat conduction problem at the vertical support on the inner side of the bottom surface. In addition, the operation process of the present invention is simple, and ordinary staff can operate it without spending a lot of time learning. Description of the Drawings

[0022] Figure 1 It is a schematic installation structure diagram of the liquid cargo tank and the liquefied gas ship hull;

[0023] Figure 2 It is a schematic installation diagram of the vertical support on the bottom surface of the liquid cargo tank;

[0024] Figure 3 It is a schematic structural diagram of the vertical support on the inner side of the bottom surface of the liquid cargo tank without the insulation layer installed;

[0025] Figure 4 It is a schematic structural diagram of the vertical support on the inner side of the bottom surface of the liquid cargo tank with the insulation layer installed;

[0026] Figure 5 It is Figure 4 The partial enlarged view at A in

[0027] Figure 6 It is Figure 4 The view at B - B in

[0028] Figure 7 It is a schematic side - view structural diagram of the vertical support on the inner side of the bottom surface of the liquid cargo tank after the insulation layer is installed.

[0029] Explanation of Component Numbers:

[0030] 1 Liquid cargo tank

[0031] 2 Hull

[0032] 3 Vertical Support on Inner Side of Bottom

[0033] 4 Vertical Support on Outer Side of Bottom

[0034] 5 Thermal Insulation Board

[0035] 6 Frame

[0036] 7 Bottom Plate

[0037] 8 Support

[0038] 9 Sealant

[0039] 10 Installation Panel

[0040] 11 Wooden Block

[0041] 12 Wooden Block Groove

[0042] 13 Foaming Material

[0043] 14 Protective Layer

[0044] 15 Rib Plate

[0045] 16 Bolt

[0046] 17 Leakage Channel

[0047] 18 Pouring Port

[0048] 19 Anticorrosion Layer

[0049] 20 Filling Through Hole

[0050] 21 Nut

[0051] 22 Support Pad

[0052] 23 Elastic Material

[0053] 24 Wooden Block on Tank Surface

[0054] 25 Adhesive Strip

[0055] 26 Anti-Roll Support in Middle of Bottom

[0056] 27 Anti-Roll Supports at Both Ends of Bottom

[0057] 28 Anti-Pitch Support of Bottom Detailed Implementation Modes

[0058] The following further elaborates on the detailed implementation modes of the present invention in conjunction with the accompanying drawings. These implementation modes are only for illustrating the present invention and are not intended to limit the present invention.

[0059] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0060] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0062] The present invention provides an installation method for the vertical support insulation layer on the inner side of the bottom surface of a Type B independent liquid cargo tank, as Figure 1 and Figure 2 shown, the vertical support 4 on the outer side of the bottom surface and the vertical support 3 on the inner side of the bottom surface are both installed on both sides of the center line along the length direction of the bottom surface of the liquid cargo tank 1, and the vertical support 3 on the inner side of the bottom surface is closer to the center line; at the same time, a middle anti-rolling support 26 on the bottom surface, an anti-rolling support 27 at both ends of the bottom surface, and an anti-longitudinal rolling support 28 on the bottom surface are also respectively installed on the bottom surface of the liquid cargo tank 1. As Figure 3 shown, the vertical support 3 on the inner side of the bottom surface includes an installation panel 10 connected to the liquid cargo tank 1 through a plurality of rib plates 15. A wooden pad groove 12 is provided on the bottom surface of the installation panel 10, and a wooden pad 11 is provided in the wooden pad groove 12. Before performing the installation method of the present invention, the outer surfaces of the liquid cargo tank 1 and the vertical support 3 on the inner side of the bottom surface can be processed. The processing steps include: after the liquid cargo tank 1 is manufactured, grinding and rust removal are performed on the outer surface of the liquid cargo tank 1 and the vertical support 3 on the inner side of the bottom surface; an anti-rust primer is sprayed on the outer surface of the ground liquid cargo tank 1 and the vertical support 3 on the inner side of the bottom surface, and after the anti-rust primer is cured, the outer surface of the liquid cargo tank 1 is surface-cleaned to remove water, oil, dust, and other pollutants; an anti-corrosion layer 19 is sprayed on the outer surface of the liquid cargo tank 1 and the vertical support 3 on the inner side of the bottom surface, etc.

[0063] The installation method of the present invention includes the following steps:

[0064] S1, as Figure 4 and Figure 5As shown, a plurality of liquid tank surface wooden pads 24 and supporting pads 22 are fixed on the outer surface of the liquid cargo tank 1, and a heat preservation board 5 is laid outside the supporting pads 22, so that there is a gap between the heat preservation board 5 and the outer surface of the liquid cargo tank 1 to form a leakage channel 17, ensuring that in the case of a small amount of liquid leakage, the leaked liquid can smoothly pass through the leakage channel 17 to reach the designated container without causing additional damage to the liquid cargo tank and the heat preservation board. The height of the leakage channel 17 is preferably 20 mm, and the leakage channel 17 in the non-support area and the liquid cargo tank 1 are filled with adhesive strips 25 to ensure the smoothness of the leakage channel 17 and ensure the safety of the structure of the liquid cargo tank 1 in case of slight leakage.

[0065] In a specific embodiment of the present invention, the liquid tank surface wooden pads 24 and the supporting pads 22 are made of laminated wood, which can play a certain buffering role for the liquid cargo tank 1 when encountering impact. The height of the supporting pads 22 can be adjusted to eliminate local errors caused by the deformation of the surface of the liquid cargo tank 1. The liquid tank surface wooden pads 24 can make the connection between the bolts 16 and the liquid cargo tank 1 closer. A plurality of bolts 16 are welded on the outer surface of the liquid cargo tank 1, as Figure 5 and Figure 6 shown, the bolts 16 sequentially pass through the supporting pads 22, the liquid tank surface wooden pads 24 and the heat preservation board 5, and the liquid tank surface wooden pads 24, the supporting pads 22 and the heat preservation board 5 are fixed on the bolts 16 through nuts 21.

[0066] As Figure 5 shown, the heat preservation board 5 is also provided with filling through holes 20, and elastic materials 23 are filled in the filling through holes 20. When the temperature changes, the elastic materials 23 in the filling through holes 20 will undergo a certain deformation to offset a part of the internal stress suffered by the heat preservation board 5 due to thermal expansion and contraction. Preferably, the elastic material 23 is glass wool. The filling through holes 20 can be set to extend longitudinally or transversely along the heat preservation board 5, and the distance between the longitudinally extending filling through holes 20 and the bolts 16 is 10-15 mm.

[0067] S2. As Figure 4 and Figure 7 shown, at the part where the heat preservation board 5 contacts the vertical support 3 on the inner side of the bottom surface, grooves corresponding to the shape of the rib plate 15 are cut out, so that the rib plate 15 is accurately embedded in the grooves of the heat preservation board 5. In order to further ensure the heat preservation effect, a sealant 9 should be used to seal the joint between the heat preservation board 5 and the rib plate 15 to completely fill the gap and avoid heat loss.

[0068] S3. As Figure 4 and Figure 5As shown in the figure, a mold cavity including a frame 6 and a bottom plate 7 is fabricated. The mold cavity is provided with a pouring port 18, and a through hole matching the pouring port 18 is opened on the bottom plate 7. The mold cavity is sleeved on the packing block 11 from bottom to top and supported by a support member 8, ensuring that the bottom plate 7 of the mold cavity is below the packing block groove 12 and does not contact the packing block groove 12. The upper edge of the frame 6 abuts against the outer surface of the already laid heat-insulating board 5. To prevent the poured foaming material 13 from leaking, the pouring port 18 is generally set at the edge position of the upper end, and a sealant 9 is filled between the through hole of the bottom plate 7 and the packing block 11. When installing the mold cavity, the purpose that the bottom plate 7 of the mold cavity does not contact the packing block groove 12 is to ensure that the foaming material 13 is also filled between the packing block 11 and the packing block groove 12, preventing the packing block groove 12 from being exposed and causing heat conduction. The support member 8 can be an oil cylinder or a jack, etc.

[0069] To facilitate demolding, a demolding sheet can also be laid on the inner surface of the mold cavity before the mold cavity is placed on the packing block 11. After determining the position of the mold cavity, the foaming material 13 is poured into the mold cavity through the pouring port 18, and the foaming material 13 wraps the installation panel 10, the packing block groove 12, and the rib plate 15 exposed outside the heat-insulating board 5.

[0070] S4. Pour the foaming material 13 full in the mold cavity. After the foaming material 13 is cured, demold the mold cavity. After demolding, as Figure 4 shown, the bottom surface of the cured foaming material 13 is at least 20 mm away from the lower end edge of the packing block groove 12. To further ensure the insulation effect, the thickness of the laid heat-insulating board 5 can be increased at the place where the vertical support is not installed, and sealant 9 is set at the corner joint of the heat-insulating board 5 and the foaming material 13, and at the same time, sealant 9 is set at the corner joint of the foaming material 13 and the packing block 11.

[0071] S5. As Figure 7 shown, after the mold cavity is demolded, a protective layer 14 is installed on the outer surfaces of the cured foaming material 13 and the heat-insulating board 5. The protective layer 14 is preferably made of aluminum foil, and the thickness of the aluminum foil is 0.2 - 0.4 mm. The aluminum foil has good airtight and watertight functions and can play a good protective role for the insulation layer. Thus, the installation of the insulation layer for the vertical support 3 on the inner side of the bottom surface of the liquid cargo tank 1 is completed.

[0072] In view of the structural characteristics of the vertical support on the inner side of the bottom surface of the B-type independent liquid cargo tank, the present invention uses both the heat-insulating board and the poured foaming material as the insulation layer. While reserving the leakage channel, it ensures the tight installation of the insulation layer, prevents the heat outside the liquid cargo tank from entering the inside of the liquid cargo tank, and effectively solves the heat conduction problem at the vertical support on the inner side of the bottom surface. In addition, the operation process of the present invention is simple, and ordinary staff can operate it without spending a lot of time learning.

[0073] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A method for installing an insulating layer on the inner vertical supports at the bottom of a Type B independent liquid cargo tank. The inner vertical supports (3) at the bottom are installed on both sides of the center line along the length direction of the bottom surface of the liquid cargo tank (1). The inner vertical supports (3) at the bottom include a mounting panel (10) connected to the liquid cargo tank (1) through a plurality of rib plates (15). A wooden block groove (12) is provided on the bottom surface of the mounting panel (10), and a wooden block (11) is provided in the wooden block groove (12). It is characterized in that, It includes the following steps: S1. A plurality of liquid tank surface dunnage (24) are fixed on the outer surface of the liquid cargo tank (1), and height-adjustable support pads (22) are provided under the liquid tank surface dunnage (24); a heat preservation board (5) is laid outside the support pads (22) so that there is a gap between the heat preservation board (5) and the outer surface of the liquid cargo tank (1) to form a leakage channel (17); S2. At the part where the heat preservation board (5) contacts the inner vertical support (3) of the bottom surface, a groove corresponding to the shape of the rib plate (15) is cut out so that the rib plate (15) is accurately embedded in the groove of the heat preservation board (5); S3. Make a mold cavity including a frame (6) and a bottom plate (7). The mold cavity is provided with a pouring port (18), and a through hole matching the pouring port (18) is opened on the bottom plate (7). The mold cavity is sleeved on the dunnage (11) from bottom to top and supported by a support (8), ensuring that the bottom plate (7) of the mold cavity is below the dunnage groove (12) and does not contact the dunnage groove (12). The upper edge of the frame (6) abuts against the outer surface of the already laid heat preservation board (5). Then, foaming material (13) is poured into the mold cavity through the pouring port (18), and the foaming material (13) wraps the mounting panel (10), the dunnage groove (12) and the rib plate (15) exposed outside the heat preservation board (5); S4. Fill the mold cavity with foaming material (13), and after the foaming material (13) cures, demold the mold cavity; S5. After the mold cavity is demolded, install a protective layer (14) on the outer surface of the cured foaming material (13) to complete the installation of the insulating layer of the inner vertical support (3) of the bottom surface of the liquid cargo tank (1).

2. The installation method of the vertical support insulating layer on the inner side of the bottom surface according to claim 1, characterized in that: In step S1, the liquid tank surface dunnage (24) and the support pads (22) are made of laminated wood.

3. The installation method of the vertical support insulating layer on the inner side of the bottom surface according to claim 1, characterized in that: In step S1, a plurality of bolts (16) are welded on the outer surface of the liquid cargo tank (1). The bolts (16) sequentially pass through the support pads (22) and the heat preservation board (5), and the support pads (22) and the heat preservation board (5) are fixed on the bolts (16) through nuts (21).

4. The installation method of the vertical support insulating layer on the inner side of the bottom surface according to claim 3, characterized in that: The heat preservation board (5) is also provided with filling through holes (20), and elastic material (23) is filled in the filling through holes (20).

5. The installation method of the vertical support insulating layer on the inner side of the bottom surface according to claim 4, characterized in that: The elastic material (23) is glass wool.

6. The installation method of the vertical support insulating layer on the inner side of the bottom surface according to claim 4, characterized in that: The distance between the filling through holes (20) and the bolts (16) is 10 - 15 mm.

7. The installation method of the vertical support insulating layer on the inner side of the bottom surface according to claim 1, characterized in that: In step S1, the height of the leakage channel (17) is 20 mm.

8. The installation method of the vertical support insulating layer on the inner side of the bottom surface according to claim 1, characterized in that: In step S2, it also includes sealing the joint between the heat preservation board (5) and the rib plate (15) with a sealant (9).

9. The installation method of the vertical support insulating layer on the inner side of the bottom surface according to claim 1, characterized in that: In step S4, it also includes: after demolding the mold cavity, setting a sealant (9) at the corner joint between the heat preservation board (5) and the foaming material (13), and setting a sealant (9) at the corner joint between the foaming material (13) and the dunnage (11).

10. The installation method of the vertical support insulating layer on the inner side of the bottom surface according to claim 1, characterized in that: In step S5, the protective layer (14) is made of aluminum foil.

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