Arrangement method for A-type liquid tank folding scaffolds of liquefied petroleum gas transport ship

Abstract

The invention relates to a liquefied petroleum gas transport ship A-type liquid tank folding scaffold arrangement method, and belongs to the technical field of ship equipment scaffold arrangement. The method relates to a segmentation stage, a half-tank stage and a complete tank stage of the A-type liquid tank, and specifically comprises the following steps: welding a scaffold eye plate piece and arranging a bearing steel pipe at the segmentation stage to form a permanent tool piece; in the half-tank stage, protection handrails are arranged, and scaffold bed boards are laid; part of scaffolds are removed in the tank body intact stage, and bearing steel pipes and scaffold eye plates are installed layer by layer through an outfitting platform. According to the method, the situation that a fully-built scaffold is built from the cabin bottom is avoided, a large number of parts needed by a traditional fully-built scaffold are reduced, damage caused by thermal cutting dismantling is avoided, low-temperature steel of the A-type liquid tank is protected against damage, and the construction efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of scaffolding arrangement for ship equipment, and in particular to a scaffolding arrangement method for closing a type A liquid tank of a liquefied petroleum gas transport ship. Background Art

[0002] As an important clean energy, the transportation demand of liquefied petroleum gas (LPG) is increasing with the growth of the global energy market. The construction of large LPG carriers has become an important development direction of the shipbuilding industry. In these carriers, the construction of type A tanks has high technical difficulty, long construction period and high engineering investment. At present, only a few shipyards have experience in building type A tanks. These shipyards usually adopt the method of independently building type A tanks and hoisting them into the cabin as a whole. For some shipyards with limited lifting capacity, they have to adopt the method of dividing the type A tank into two parts and building them separately, and then completing the final closure in the cabin. However, this method of segmented construction and closure puts higher requirements on the construction process. In particular, due to the limitations of the structure of the type A tank, only the deck air chamber can enter and exit the tank. Due to the small opening of the deck air chamber, all large lifting equipment cannot enter the cabin for construction after the tank is closed. Therefore, the construction of the anti-top closure seam of the type A tank after closure has become an urgent problem to be solved.

[0003] Traditionally, in the production of Type A liquid tanks, the method of full scaffolding is usually adopted. This method requires construction from the bottom of the tank, which is extremely labor-intensive and takes a long time. In addition, during the construction and dismantling process, due to the large number of parts used, many toolings made of materials different from cryogenic steel need to be connected to the cryogenic steel. This often uses hot cutting during dismantling, which can easily cause damage to the cryogenic steel in the Type A liquid tank. In addition, this scaffolding construction method involves a large number of parts, which also brings inconvenience to on-site workers, affects work efficiency, and increases production costs.

[0004] The traditional full-frame scaffolding method is difficult to meet this special demand, and a new solution is needed to improve construction efficiency and reduce potential damage to the A-type liquid tank structure. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas carrier. The second load-bearing steel pipe and the third scaffolding eye plate form a permanent tooling piece, which is used in combination with an assembled scaffolding, thereby reducing the large number of components and complicated erection procedures required for a traditional full-build scaffolding. The tooling in contact with the low-temperature steel in the cabin is permanently retained, and the erection and removal of the tooling that does not contact the low-temperature steel are quick and convenient, effectively avoiding the damage to the low-temperature steel caused by the frequent erection and removal of the scaffolding in the traditional method. The purpose of the present invention is to provide a method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas carrier, which solves the problem of the independent construction of the half tank of the type A liquid tank and the closing process of entering the cabin, reduces the damage to the insulation material and the low-temperature steel, and provides convenience for subsequent maintenance.

[0006] To achieve the above object, the present invention provides a method for arranging a scaffold for assembling a type A liquid tank of a liquefied petroleum gas transport ship. The construction of the type A liquid tank includes a segmentation stage, a half tank stage and a complete tank stage. The scaffolding arrangement method comprises the following steps:

[0007] Welding scaffolding eye plates and arranging load-bearing steel pipes in the segmented stage to form permanent tooling;

[0008] At the half-tank stage, protective railings are set up and scaffolding planks are laid;

[0009] In the complete tank stage, some scaffolding is removed and the A-type tank outfitting platform is used to install load-bearing steel pipe fittings and scaffolding eye plate parts layer by layer;

[0010] When the complete tank construction is completed, the arrangement of the permanent tooling is retained and the remaining scaffolding is removed.

[0011] Furthermore, the scaffolding arrangement includes a half-tank stage in which the two half-tanks of the A-type liquid tank are independently constructed and a stage in which the two half-tanks are put into the cabin and combined into a complete tank body of the A-type liquid tank. There is a segmentation stage before the half-tank stage. When the A-type liquid tank is in the segmentation stage production, scaffolding eye plates are welded on the segmented components of the A-type liquid tank in advance and a second load-bearing steel pipe is arranged to form a permanent tooling part. The scaffolding arrangement method is specifically as follows:

[0012] When the A-type liquid tank is in the stage of segmented production, the following tooling is welded in advance: a second scaffolding eye plate with a preset tooling spacing is welded on the segmented components at the joint of the A-type liquid tank, a plurality of the second load-bearing steel pipes are combined to form a permanent tooling part, a scaffolding eye plate and a third scaffolding eye plate meeting the preset tooling spacing are welded on the segmented components on the deck surface of the A-type liquid tank, and a first scaffolding eye plate is welded on the segmented components on the facade of the A-type liquid tank and on the outfitting platform of the A-type liquid tank;

[0013] When the A-type liquid tank is in the half-tank stage, the second protective railing is clamped at the closing seam of the A-type liquid tank according to the preset tooling spacing, and scaffolding planks are laid on the second protective railing as a safety barrier, and then the first scaffolding support is connected to the third scaffolding eye plate on the deck surface of the A-type liquid tank, and the first load-bearing steel pipe is connected to the first scaffolding eye plate, and finally the scaffolding planks are laid for construction workers to step on; on the facade of the A-type liquid tank, the first scaffolding support is connected to the first scaffolding eye plate according to the preset tooling spacing, and the scaffolding planks are laid on the first scaffolding support, and the first protective railing is installed at the end of the first scaffolding support, and then the first scaffolding support is connected to the first scaffolding eye plate at the outfitting platform according to the preset tooling spacing, and the first protective railing is installed at the end of the first scaffolding support, and the scaffolding planks and the outfitting platform are laid to form a complete construction platform;

[0014] When the Type A liquid tank is in the complete tank stage, the second protective railing and scaffolding plank at the closing seam are removed, and the complete construction platform composed of the scaffolding plank in the Type A liquid tank and the outfitting platform is used, in conjunction with the second load-bearing steel pipe, to install the first load-bearing steel pipe, the second scaffolding eye and the protective chain layer by layer from bottom to top until the permanent tooling parts, and the scaffolding plank is laid to form a scaffolding platform; for the scaffolding on the deck surface of the Type A liquid tank, a plurality of the first protective railings are respectively inserted into the first scaffolding support and the first load-bearing steel pipe, and the scaffolding plank is laid on the first scaffolding support; at the closing seam, the first scaffolding support is connected to the first scaffolding eye board according to the preset tooling spacing, and the scaffolding plank is laid on the first scaffolding support, and the first protective railing is installed at the end of the first scaffolding support;

[0015] When the complete tank construction is completed, the arrangement of the permanent tooling is retained and the remaining scaffolding is removed.

[0016] Furthermore, when the A-type liquid tank is in the complete tank stage, the outfitting platform in the A-type liquid tank is used to cooperate with the second load-bearing steel pipe to install the first load-bearing steel pipe, the second scaffolding eye plate and the protection chain layer by layer from bottom to top until the permanent tooling parts, and the scaffolding planks are laid to form a scaffolding platform, which specifically includes:

[0017] S1. The upper end of the first load-bearing steel pipe is hung obliquely into the second scaffolding eye plate, and the lower end of the first load-bearing steel pipe is inserted into a plurality of long pipes, and fixed by steel wire to form an assembly.

[0018] S2. Lay scaffolding planks along the width direction of the A-type liquid tank;

[0019] S3, assembling a plurality of the assemblies and fixing them with steel wires to form a scaffolding platform;

[0020] S4, on the scaffolding platform, repeating steps S1 to S3 to install layer by layer until the topmost layer of permanent tooling formed by a plurality of the second load-bearing steel pipes is located;

[0021] S5. Lay scaffolding planks directly on the permanent tooling components, and connect the plurality of the second load-bearing steel pipes in the permanent tooling components with the scaffolding planks to form a continuous construction passage running from left to right.

[0022] Furthermore, each scaffolding platform is equipped with a protective chain at half the height of the first load-bearing steel pipe to provide protection.

[0023] Furthermore, for the scaffolding on the deck surface of the type A liquid tank, a prefabricated scaffolding erection method is used separately on the left and right sides of the deck surface to ensure construction space, and the prefabricated scaffolding erection method specifically includes:

[0024] When the A-type liquid tank is in the stage of block production, the third scaffolding eye plate is welded on the A-type liquid tank deck surface block in advance;

[0025] When the A-type liquid tank is in the half-tank stage, the first scaffolding support is connected to the third scaffolding eye plate on the deck surface of the A-type liquid tank, and the scaffolding plank is laid on the first scaffolding support for walking;

[0026] When the A-type liquid tank is in the complete tank stage, the first protective railing is inserted into the first scaffolding support, and the first protective railings are connected by long pipes and fixed with steel wires.

[0027] Furthermore, the distance between the scaffolding eye plate and the plate seam of the A-type liquid tank is not less than 300 mm, and the scaffolding eye plate is arranged at a position 1400 mm downward from the transverse seam of the A-type liquid tank.

[0028] Furthermore, the horizontal distance between adjacent scaffolding eye plates is not greater than 2400 mm.

[0029] Furthermore, adjacent first protective railings and adjacent second protective railings are connected by long tubes.

[0030] Furthermore, the scaffolding eye plate is assembled and welded in the segmented stage. The scaffolding eye plate is welded on the A-type liquid tank. The material of the scaffolding eye plate weld is consistent with the segmented components of the A-type liquid tank, which is low-temperature steel. The scaffolding eye plate adopts double-sided continuous welding, and its ends are angle welded.

[0031] Furthermore, the scaffolding arrangement adopts assembled scaffolding tooling, and the assembled scaffolding tooling is divided into two types: clamp type and eye plate welding type. The clamp type includes a second protective railing, which is configured to clamp the scaffolding clamp at the closing mouth of the deck surface of the A-type liquid tank, and the eye plate welding type is configured to be arranged at the non-closing mouth of the A-type liquid tank.

[0032] Furthermore, the preset tooling spacing is no greater than 2.8m.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The present invention obliquely hangs the second load-bearing steel pipe into the second scaffolding eye plate pre-installed in the segmentation stage to form a permanent tooling part, and arranges the permanent tooling part in advance in the reverse top closing seam of the A-type liquid tank where the construction workers cannot reach after closing, and uses the A-type liquid tank outfitting platform to install scaffolding supports and protective chains in sequence, and lays scaffolding planks to form a scaffolding platform until the permanent tooling is located, thereby reducing the large number of components and complex erection procedures required for traditional full-length scaffolding, avoiding the construction of a full-length scaffolding from the bottom of the cabin, and because the assembled scaffolding of the present invention includes a clamp-type scaffolding, due to its rapid erection and dismantling characteristics, it can shorten the construction period of the A-type liquid tank closing stage, speed up the overall construction progress, and thus significantly improve the construction efficiency.

[0035] (2) The second scaffolding support, the second load-bearing steel pipe and the third scaffolding eye plate of the present invention are all non-standard parts redesigned for the implementation of the present method. The end slot direction of the second scaffolding support is different from that of the first scaffolding support so that the protective railing can be arranged parallel to the scaffolding support. The second load-bearing steel pipe has a diagonal rod support to be laid on the top closing seam of the A-type liquid tank. The third scaffolding eye plate is cut at an angle to adapt to the inclined surface of the A-type liquid tank.

[0036] (3) The scaffolding eye plates in the cabin of the present invention are made of the same low-temperature steel as the material of the A-type liquid tank. After completion, they can be cut off with the roots left. No hot cutting method is used during dismantling, which will not cause damage to the low-temperature steel in the A-type liquid tank. The damage to the insulation material and low-temperature steel in the A-type liquid tank during the erection of traditional scaffolding is reduced. In addition, since the material of the assembled scaffolding eye plates used in the A-type liquid tank is consistent with the low-temperature steel in the surrounding environment, they can be retained in the cabin after construction is completed without being cut off. In addition, during the subsequent use of the A-type liquid tank, if maintenance work is required, they can be reused, which provides convenience for subsequent work.

[0037] In summary, the present invention not only improves the construction efficiency and safety of the A-type liquid tank closure scaffolding of the liquefied petroleum gas transport ship, but also reduces the cost and protects the A-type liquid tank structure, while providing convenience for subsequent maintenance operations, and has significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a general three-dimensional schematic diagram of the construction of the scaffolding for closing the type A liquid tank of the liquefied petroleum gas carrier when the type A liquid tank is in the half-tank stage;

[0039] Figure 2 It is a general three-dimensional schematic diagram of the construction of the scaffolding for closing the type A liquid tank of the liquefied petroleum gas carrier when the type A liquid tank is in the complete tank stage;

[0040] Figure 3 Provide a component number comparison table for the embodiments of the present invention;

[0041] Figure 4 A schematic diagram of the arrangement of the scaffolding at the closing mouth provided by an embodiment of the present invention;

[0042] Figure 5 A schematic diagram of the scaffolding erection on the deck surface of a type A liquid tank provided by an embodiment of the present invention;

[0043] Figure 6 A schematic diagram of the scaffolding arrangement on the exterior facade of a type A liquid tank provided in an embodiment of the present invention;

[0044] Figure 7 A schematic diagram of the scaffolding arrangement at the outfitting platform in the A-type liquid tank provided in an embodiment of the present invention;

[0045] Figure 8 A schematic diagram of the arrangement of the scaffolding at the closing seam provided by an embodiment of the present invention;

[0046] Fig. 9 A schematic diagram of the arrangement of scaffolding at the closing opening on the facade of a type A liquid tank provided in an embodiment of the present invention;

[0047] Fig.10 A construction flow chart of a scaffolding for closing a type A liquid tank of a liquefied petroleum gas transport ship provided by an embodiment of the present invention;

[0048] Explanation of reference numbers: 1. Scaffolding support member; 1-1. First scaffolding support; 1-2. Second scaffolding support; 2. Load-bearing steel pipe member; 2-1. First load-bearing steel pipe; 2-2. Second load-bearing steel pipe; 3. Scaffolding eye plate member; 3-1. First scaffolding eye plate; 3-2. Second scaffolding eye plate; 3-3. Third scaffolding eye plate; 4. Guardrail member; 4-1. First guardrail; 4-2. Second guardrail; 5. Scaffolding plank. DETAILED DESCRIPTION

[0049] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "axial", "lateral", "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which 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 cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0051] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0052] like Figure 1-Figure 9 As shown, the method for erecting a scaffolding in the closing stage of the cargo hold hopper tank of a bulk carrier described in the present invention includes technical features such as scaffolding support members 1, load-bearing steel pipe members 2, scaffolding eye plate members 3, protective railing members 4, and scaffolding planks 5.

[0053] like Figure 1 - Fig. 9 As shown, an embodiment of the present invention provides a method for arranging a scaffold for assembling a type A liquid tank of a liquefied petroleum gas transport ship, and the steps of the scaffold arrangement method include:

[0054] In the segmentation stage, the scaffolding eye plate parts 3 are welded and the load-bearing steel pipe parts 2 are arranged to form permanent tooling parts;

[0055] In the half tank stage, protective railings 4 are set and scaffolding planks 5 are laid;

[0056] In the complete tank stage, some scaffolding is removed and the A-type liquid tank outfitting platform is used to install the load-bearing steel pipe fittings 3 and scaffolding eye plate fittings 5 ​​layer by layer;

[0057] When the complete tank construction is completed, the arrangement of the permanent tooling is retained and the remaining scaffolding is removed.

[0058] Furthermore, the scaffolding arrangement includes a half-tank stage in which two half-tanks of the A-type liquid tank are independently constructed and a stage in which the two half-tanks are put into the cabin and combined into a complete tank body of the A-type liquid tank. There is a segmentation stage before the half-tank stage. In the segmentation stage of the A-type liquid tank, scaffolding eye plates are welded on the segmented components of the A-type liquid tank in advance and a second load-bearing steel pipe is arranged to form a permanent tooling. According to the different locations of the scaffolding, there are four types of scaffolding:

[0059] The first type is the scaffolding built on the joint of the A-type liquid tank;

[0060] The second type is the scaffolding built on the deck of the A-type liquid tank;

[0061] The third type is the scaffolding built on the facade of the Type A liquid tank;

[0062] The fourth type is the scaffolding built on the outfitting platform inside the A-type liquid tank;

[0063] The corresponding scaffolding arrangement method is as follows:

[0064] For scaffolding of Type A tank closure seams:

[0065] When the A-type liquid tank is in the segmentation stage, a plurality of second scaffolding eye plates 3-2 meeting the preset tooling spacing are welded on the segmented components at the top closing seam of the A-type liquid tank in advance, and a plurality of second load-bearing steel pipes 2-2 are respectively connected to a plurality of the second scaffolding eye plates 3-2 to form a permanent tooling part, that is, Figure 8 Node G in

[0066] like Figure 4 As shown, when the A-type liquid tank is in the half-tank stage, the second protective railing 4-2 is welded to the closed seam of the A-type liquid tank according to the preset tooling spacing, the second protective railings 4-2 are connected with a long pipe, and the scaffolding planks 5 are laid on the second protective railings 4-2 as a safety barrier to form a node A;

[0067] like Figure 8 As shown, when the A-type liquid tank is in the complete tank stage, the outfitting platform in the A-type liquid tank is used to cooperate with the second load-bearing steel pipe 2-2 to install the first load-bearing steel pipe 2-1, the second scaffolding eye plate 3-2 and the protection chain layer by layer, and the scaffolding plank 5 is laid to form a scaffolding platform to form a node H;

[0068] For scaffolding on Type A tank deck:

[0069] When the A-type liquid tank is in the stage of segmented production, the first scaffolding eye plate 3-1 and the third scaffolding eye plate 3-3 meeting the preset tooling spacing are welded in advance on the segmented components of the deck surface of the A-type liquid tank;

[0070] like Figure 5As shown, when the A-type liquid tank is in the half-tank stage, the first scaffolding support 1-1 is connected to the third scaffolding eye plate 3-3, the first load-bearing steel pipe 1-2 is connected to the first scaffolding eye plate 3-1, and finally the scaffolding plank 5 is laid for stepping, so as to form a node B;

[0071] When the A-type liquid tank is in the complete tank stage, multiple first protective railings 4-1 are respectively inserted into the first scaffolding support 1-1 and the first load-bearing steel pipe 1-2, and the adjacent first protective railings 4-1 are connected with long pipes and fixed with steel wires. The scaffolding planks 5 are laid on the first scaffolding support 1-1 to form nodes C and D respectively; except for the removal of the second protective railings 4-2 at the closing seam, the arrangement of the other half-tank scaffoldings is maintained until all are removed after the construction of the complete tank is completed;

[0072] For scaffolding on the facade of Type A liquid tank:

[0073] When the A-type liquid tank is in the stage of segmented production, the first scaffolding eye plate 3-1 is welded in advance on the segmented components of the outer facade of the A-type liquid tank;

[0074] like Figure 6 As shown, when the A-type liquid tank is in the half-tank stage, the first scaffolding support 1-1 is connected to the first scaffolding eye plate 3-1 on the facade of the A-type liquid tank according to the preset tooling spacing, and the scaffolding plank 5 is laid on the first scaffolding support 1-1, and the first protective railing 4-1 is installed at the end of the first scaffolding support 1-1 to form a node E;

[0075] like Fig. 9 As shown, when the A-type liquid tank is in the complete tank stage, the first scaffolding support 1-1 is connected to the first scaffolding eye plate 3-1 at the closing seam according to the preset tooling spacing, and the scaffolding plank 5 is laid on the first scaffolding support 1-1 to form a node J, and the first protective railing 4-1 is installed at the end of the first scaffolding support 1-1. The other half-tank scaffolding is maintained until it is completely removed after the construction of the complete tank is completed;

[0076] For the scaffolding at the outfitting platform in the A-type tank:

[0077] When the A-type liquid tank is in the stage of segmented production, the first scaffolding eye plate 3-1 is welded on the segmented component at the A-type liquid tank outfitting platform in advance;

[0078] like Figure 7 As shown, when the A-type liquid tank is in the half-tank stage, the first scaffolding support 1-1 and the first protective railing 4-1 are set up and installed at the outfitting platform according to the preset tooling spacing, and the adjacent first protective railings 4-1 are connected with long pipes, and the scaffolding planks 5 are laid to form a node F, and the node F and the outfitting platform constitute a complete construction platform;

[0079] When the Type A liquid tank is in the complete tank stage, the scaffolding of the Type A liquid tank at the outfitting platform is maintained at the half-tank stage until it is completely removed after the construction of the complete tank is completed.

[0080] Specifically, the present method gives priority to assembled scaffolding tools, including clamp type and eye plate welding type. The clamp type includes a second protective railing 4-2, which is configured to clamp the scaffolding clamp at the closing mouth of the deck surface of the A-type liquid tank, and the eye plate welding type is configured to be arranged at the non-closing mouth of the A-type liquid tank. All scaffolding eye plate parts 3 are welded in the segmented stage. The distance between the scaffolding eye plate and the plate seam should generally be no less than 300mm. The scaffolding eye plate parts 3 should be set on the main structural member of the A-type liquid tank. The horizontal distance between adjacent scaffolding eye plates is no more than 2400mm. The scaffolding eye plate should be designed as far as possible at a position about 1400mm downward from the transverse seam of the A-type liquid tank to facilitate construction by construction personnel. The scaffolding eye plate parts 3 should be welded on the A-type liquid tank. The material is consistent with the segmented components of the A-type liquid tank, which is low-temperature steel. Double-sided continuous welding is adopted, and the ends need to be corner welded. The height of the weld leg is usually 6mm. All process equipment used in prefabricated scaffolding must pass strength testing and be erected strictly in accordance with the requirements of the drawings.

[0081] Specifically, when the A-type liquid tank is in the complete tank stage, the outfitting platform in the A-type liquid tank is used to cooperate with the second load-bearing steel pipe 2-1 to install the first load-bearing steel pipe 2-1, the second scaffolding eye plate 3-2 and the protection chain layer by layer from bottom to top until the permanent tooling parts, and the scaffolding planks are laid to form a scaffolding platform, which specifically includes the following steps:

[0082] S1. Hang the upper end of the first load-bearing steel pipe obliquely into the second scaffolding eye plate, insert the lower end of the first load-bearing steel pipe 2-1 into multiple long pipes, and fix them with steel wires to form an assembly.

[0083] S2. Lay scaffolding planks along the width direction of the A-type liquid tank;

[0084] S3, assembling multiple components and fixing them with steel wires to form a scaffolding platform;

[0085] S4, on the scaffolding platform, repeating steps S1 to S3 to install layer by layer until the topmost layer of permanent tooling formed by a plurality of second load-bearing steel pipes 2-2 is located;

[0086] S5. Lay scaffolding planks directly on the permanent tooling parts. The scaffolding planks connect multiple second load-bearing steel pipes 2-2 in the permanent tooling parts to form a continuous construction passage from left to right.

[0087] Preferably, each scaffolding platform is equipped with a protective chain at half the height of the first load-bearing steel pipe to provide protection.

[0088] Specifically, for the scaffolding on the deck of type A liquid tank, the assembled scaffolding erection method is used separately on the left and right sides of the deck to ensure the construction space. The assembled scaffolding erection method specifically includes:

[0089] When the A-type liquid tank is in the stage of segmented production, the third scaffolding eye plate 3-3 is welded on the A-type liquid tank deck surface segment in advance;

[0090] When the A-type liquid tank is in the half-tank stage, the first scaffolding support 1-1 is connected to the third scaffolding eye plate 3-3 on the deck surface of the A-type liquid tank, and the scaffolding plank is laid on the first scaffolding support 1-1 for walking;

[0091] When the A-type liquid tank is in the complete tank stage, the first protective railing is inserted into the first scaffolding support 1-1, and the first protective railings 4-1 are connected by long pipes and fixed with steel wires.

[0092] Specifically, adjacent first protection rails 4 - 1 and adjacent second protection rails 4 - 2 are connected by long tubes.

[0093] Furthermore, the preset tooling spacing is not greater than 2.8m. Furthermore, the dismantling steps of the assembled scaffolding follow the principle of "dismantle the outside first, then the inside; dismantle the top first, then the bottom". Specifically, first dismantle the scaffolding from the middle of the top of the A-type liquid tank to both sides except for the second scaffolding eye plate 3-2 and the second load-bearing steel pipe 2-2, first dismantle the scaffolding plank 5 on the second load-bearing steel pipe 2-2, and then stand on the scaffolding platforms of each layer on the outfitting platform to dismantle the assembled scaffolding parts except the scaffolding eye plate 3 from the middle to both sides. Among them, the first load-bearing steel pipe 2-1 needs to be taken out of the scaffolding eye plate 3 by means of oblique pulling.

[0094] The dismantling order of the tooling parts of the prefabricated scaffolding is opposite to the erection order, and should comply with the requirements of the "Prefabricated Scaffolding Erection and Dismantling Process". If necessary, use an aerial hydraulic vehicle to assist the operation. When dismantling, the hand-assembled parts of the scaffolding should be passed hand to hand or lowered with a fiber rope of more than 16 mm. It is strictly prohibited to throw them randomly. The dismantling personnel should hang a life rope and it is strictly prohibited to work up and down at the same time.

[0095] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0096] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas transport ship, characterized in that: The construction of type A liquid tank includes the segmentation stage, half tank stage and complete tank stage. The scaffolding arrangement method and steps include: When the A-type liquid tank is in the stage of segmented production, the scaffolding eye plates are welded on each segmented component of the A-type liquid tank body and the load-bearing steel pipe fittings are arranged to form permanent tooling parts; At the half-tank stage, protective railings are set up and scaffolding planks are laid; As the A-type tank is combined from two half tanks into a complete tank, the protective railings and scaffolding planks at the joints are removed, and the A-type tank outfitting platform is used to install the load-bearing steel pipes and scaffolding eye plates layer by layer until they are connected with the permanent tooling parts; When the complete tank construction is completed, the arrangement of the permanent tooling is retained and the remaining scaffolding is removed.

2. The method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas carrier according to claim 1 is characterized in that: Depending on the location of the scaffolding, there are four types of scaffolding: The first type is the scaffolding built on the joint of the A-type liquid tank; The second type is the scaffolding built on the deck of the A-type liquid tank; The third type is the scaffolding built on the facade of the Type A liquid tank; The fourth type is the scaffolding built on the outfitting platform inside the A-type liquid tank; There are four corresponding scaffolding layout methods: For scaffolding of Type A tank closure seams: When the A-type liquid tank is in the segmentation stage, a plurality of second scaffolding eye plates meeting the preset tooling spacing are welded on the segmentation components at the top closing seam of the A-type liquid tank, and a plurality of second load-bearing steel pipes are respectively connected to the plurality of the second scaffolding eye plates to form permanent tooling parts; When the A-type liquid tank is in the half-tank stage, the second protective railing is clamped at the closing seam of the A-type liquid tank according to the preset tooling spacing, and scaffolding planks are laid on the second protective railing as a safety barrier; When the A-type tank is in the complete tank stage, remove the second protective railing and scaffolding planks at the closing seam, and use the outfitting platform inside the A-type tank, cooperate with the second load-bearing steel pipe, install the first load-bearing steel pipe, the second scaffolding eye and protective chain layer by layer from bottom to top until the permanent tooling parts, and lay the scaffolding planks to form a scaffolding platform; For scaffolding on Type A tank deck: When the A-type liquid tank is in the stage of segmented production, the first scaffolding eye plate and the third scaffolding eye plate that meet the preset tooling spacing are welded in advance on the segmented components of the deck surface of the A-type liquid tank; When the A-type liquid tank is in the half-tank stage, the first scaffolding support is then connected to the third scaffolding eye plate on the deck surface of the A-type liquid tank, the first load-bearing steel pipe is connected to the first scaffolding eye plate, and finally the scaffolding plank is laid for construction workers to step on; When the A-type liquid tank is in the complete tank stage, a plurality of the first protective railings are respectively inserted into the first scaffolding support and the first load-bearing steel pipe, and scaffolding planks are laid on the first scaffolding support; For scaffolding on the facade of Type A liquid tank: When the A-type liquid tank is in the stage of segmented production, the first scaffolding eye plate is welded on the segmented components of the outer facade of the A-type liquid tank in advance; When the A-type liquid tank is in the half-tank stage, the first scaffolding support is connected to the first scaffolding eye plate on the outer facade of the A-type liquid tank according to the preset tooling spacing, the scaffolding plank is laid on the first scaffolding support, and the first protective railing is installed at the end of the first scaffolding support; When the A-type liquid tank is in the complete tank stage, the first scaffolding support is connected with the first scaffolding eye plate at the closing seam according to the preset tooling spacing, and the scaffolding plank is laid on the first scaffolding support; For the scaffolding at the outfitting platform in the A-type tank: When the A-type liquid tank is in the stage of block production, the first scaffolding eye plate is welded on the block components at the A-type liquid tank outfitting platform in advance; When the A-type liquid tank is in the half-tank stage, the first scaffolding support is connected to the first scaffolding eye plate at the outfitting platform according to the preset tooling spacing, and the first protective railing is installed at the end of the first scaffolding support, and the scaffolding planks and the outfitting platform are laid to form a complete construction platform; When the Type A liquid tank is in the complete tank stage, the arrangement of the scaffolding of the Type A liquid tank at the outfitting platform is maintained at the half tank stage.

3. The method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas carrier according to claim 2, characterized in that: When the A-type tank is in the complete tank stage, the outfitting platform in the A-type tank is used to cooperate with the second load-bearing steel pipe to install the first load-bearing steel pipe, the second scaffolding eye and the protection chain layer by layer from bottom to top until the permanent tooling parts, and lay the scaffolding planks to form a scaffolding platform, which specifically includes the following steps: S1. The upper end of the first load-bearing steel pipe is hung obliquely into the second scaffolding eye plate, and the lower end of the first load-bearing steel pipe is inserted into a plurality of long pipes, and fixed by steel wire to form an assembly. S2. Lay scaffolding planks along the width direction of the A-type liquid tank; S3, assembling a plurality of the assemblies and fixing them with steel wires to form a scaffolding platform; S4, on the scaffolding platform, repeating steps S1 to S3 to install layer by layer until the topmost layer of permanent tooling formed by a plurality of the second load-bearing steel pipes is located; S5. Lay scaffolding planks directly on the permanent tooling components, and connect the plurality of the second load-bearing steel pipes in the permanent tooling components with the scaffolding planks to form a continuous construction passage running from left to right.

4. The method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas carrier according to claim 3 is characterized in that: Each scaffolding platform is equipped with a protective chain at half the height of the first load-bearing steel pipe to provide protection.

5. The method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas carrier according to claim 2, characterized in that: For the scaffolding on the deck of type A liquid tank, the assembled scaffolding erection method is used separately on the left and right sides of the deck to ensure the construction space. The assembled scaffolding erection method specifically includes: When the A-type liquid tank is in the stage of block production, the third scaffolding eye plate is welded on the A-type liquid tank deck surface block in advance; When the A-type liquid tank is in the half-tank stage, the first scaffolding support is connected to the third scaffolding eye plate on the deck surface of the A-type liquid tank, and the scaffolding plank is laid on the first scaffolding support for walking; When the A-type liquid tank is in the complete tank stage, the first protective railing is inserted into the first scaffolding support, and the first protective railings are connected by long pipes and fixed with steel wires.

6. The method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas carrier according to claim 2, characterized in that: The distance between the scaffolding eye plate and the plate seam of the A-type liquid tank is not less than 300mm. The scaffolding eye plate is arranged 1400mm downward from the transverse seam of the A-type liquid tank, and the horizontal distance between adjacent scaffolding eye plates is not more than 2400mm.

7. The method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas carrier according to claim 2, characterized in that: Adjacent first protection railings and adjacent second protection railings are connected by long pipes.

8. The method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas carrier according to claim 2, characterized in that: The scaffolding eye plate is assembled and welded in the segmented stage. The scaffolding eye plate is welded on the A-type liquid tank. The material of the scaffolding eye plate weld is consistent with the segmented components of the A-type liquid tank, which is low-temperature steel. The scaffolding eye plate adopts double-sided continuous welding, and its ends are angle welded.

9. The method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas carrier according to claim 2, characterized in that: The scaffolding arrangement adopts assembled scaffolding tooling, and the assembled scaffolding tooling is divided into two types: clamp type and eye plate welding type. The clamp type includes a second protective railing, which is configured to clamp the scaffolding clamp at the closing mouth of the deck surface of the A-type liquid tank, and the eye plate welding type is configured to be arranged at the non-closing mouth of the A-type liquid tank.

10. The method for arranging a scaffolding for closing a type A liquid tank of a liquefied petroleum gas carrier according to claim 2, characterized in that: The preset tooling spacing is no greater than 2.8m.

Images