Construction method of prismatic liquid tank

Abstract

The invention provides a construction method of a prismatic liquid tank, which comprises the following steps: firstly, carrying out framework division on the prismatic liquid tank, cutting the prismatic liquid tank in a horizontal octagonal prism shape into three parts along a horizontal section, including an upper part, a middle part and a lower part, each part accounts for about 1 / 3 of the total volume, and dividing each part into a plurality of middle assemblies; special supporting tools are designed for the upper portion, the middle portion and the lower portion and used for assisting in fixing all the middle assemblies, and after the middle assemblies are assembled, welding robots are arranged in a unified mode for centralized welding. And after the upper part, the middle part and the lower part are respectively constructed, butting and folding are carried out, so that the construction of the whole prismatic liquid tank is completed. According to the construction method, the large-group construction process is omitted, the total-group construction method is optimized, the limitation of a construction site is broken through, core resources such as cranes and sites in a slipway or dock area are saved, erecting and dismantling of scaffolds are reduced, application of welding robots is promoted, meanwhile, the construction period of the prismatic liquid tank is shortened, and the construction efficiency and construction cost of the liquid tank are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and particularly to a construction method for a prismatic liquid tank. Background Art

[0002] Competition in the liquefied ship industry is becoming increasingly fierce. With the extensive application of robotic construction in the construction of prismatic liquid tanks, the importance of cost and cycle control in the construction of prismatic liquid tanks has become increasingly prominent.

[0003] The current construction method for prismatic liquid tanks refers to the hull construction method and adopts the sectional construction method and the tower construction method. The sectional construction method: It refers to a construction method in which the hull is assembled mainly by hull sections on a shipbuilding berth or in a dry dock. First, structural components are assembled into sections in a workshop, and sectional pre-outfitting is carried out. Then, the sections are hoisted and joined together on the shipbuilding berth (dry dock) to form the whole ship. The tower construction method: When assembling on the shipbuilding berth, taking a certain bottom section as a reference, sections are assembled in a tower shape from front to back, left to right, and from bottom to top, and finally assembled into a complete hull.

[0004] The current construction method for prismatic liquid tanks is similar to the form of building blocks, and its construction process: small group → medium group → large group → general group (semi-tank welding → whole tank joining) → painting → insulation assembly. The current construction method for prismatic liquid tanks has the following disadvantages: 1. The degree of welding automation in the large group and general group stages is low, and traditional manual welding is mostly used, resulting in a long production cycle; 2. It has high requirements for site resources. The production of the large group can generally only be carried out at a site with a jig and a lifting device with strong lifting capacity. The general group stage has even higher requirements for the site and can generally only be carried out on a welding platform or dry dock (berth) with a giant gantry crane. Site resources limit the production efficiency of the large group and general group; 3. A large amount of scaffolding needs to be erected and removed during the traditional construction process, which greatly occupies the construction cycle and construction cost. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the present invention provides a construction method for a prismatic liquid tank, including the following steps:

[0006] S1: Divide the structure of the prismatic liquid tank. The prismatic liquid tank is a horizontal octagonal prism, including two end faces and eight side faces. The two end faces are the bow face and the stern face, both of which are octagonal faces. The eight side faces are rectangular faces. Circular arcs are provided at the joints of the eight side faces to form an arc transition; the prismatic liquid tank is cut into three parts along the horizontal section, including the upper part, the middle part, and the lower part. The longitudinal sections of the upper part and the lower part are both trapezoids, and the longitudinal section of the middle part is a rectangle;

[0007] S2: Arrange the bottom support tooling and construct the lower part;

[0008] S3: Arrange the middle support tooling and construct the middle part;

[0009] S4: Arrange the upper support tooling and construct the upper part;

[0010] S5: Connect the middle part and the upper part to form a 2 / 3 tank;

[0011] S6: Connect the 2 / 3 tank and the lower part to complete the welding of the whole tank.

[0012] Optionally, in step S1, for the end faces, they are divided into the bottom port end wall intermediate assembly, bottom starboard end wall intermediate assembly located at the lower part, the middle port end wall intermediate assembly, middle starboard end wall intermediate assembly located at the middle part, and the top port end wall intermediate assembly, top starboard end wall intermediate assembly, top middle end wall intermediate assembly located at the upper part;

[0013] The eight side faces are divided into the bottom plate intermediate assembly, port bottom inclined plate intermediate assembly, starboard bottom inclined plate intermediate assembly located at the lower part, the port side outer plate intermediate assembly, starboard side outer plate intermediate assembly located at the middle part, and the top plate intermediate assembly, port inclined top plate intermediate assembly, starboard inclined top plate intermediate assembly located at the upper part; the bottom plate intermediate assembly includes the port bottom plate intermediate assembly and the starboard bottom plate intermediate assembly;

[0014] Inside the cavities formed by the end faces and side faces located at the lower part, there are arranged the bottom port transverse bulkhead intermediate assembly, bottom starboard transverse bulkhead intermediate assembly, bottom middle longitudinal bulkhead intermediate assembly; inside the cavities formed by the end faces and side faces located at the middle part, there are arranged the middle port transverse bulkhead intermediate assembly, middle starboard transverse bulkhead intermediate assembly, middle middle longitudinal bulkhead intermediate assembly; inside the cavities formed by the end faces and side faces located at the upper part, there is arranged the top middle longitudinal bulkhead intermediate assembly; among them, the transverse bulkhead intermediate assemblies are arranged perpendicular to the bow-stern direction, the middle longitudinal bulkhead intermediate assemblies are perpendicular to the left-right direction, and the transverse bulkhead intermediate assemblies are located between the port and starboard transverse bulkhead intermediate assemblies.

[0015] Optionally, in step S2, the bottom support tooling includes a portal frame, the portal frame includes a support beam arranged along the left-right direction and vertical support columns fixed to the lower surface of the support beam, the upper surface of the support beam is fixed with a plurality of vertical angle steels arranged along the left-right direction, and a plurality of bottom support toolings are evenly arranged along the bow-stern direction; the gap between adjacent vertical support columns can accommodate the transport vehicle;

[0016] Place the port bottom plate intermediate assembly, starboard bottom plate intermediate assembly, port bottom inclined plate intermediate assembly, starboard bottom inclined plate intermediate assembly on the top of the angle steels of the bottom support tooling, and support templates are padded at the turning circles of the port bottom inclined plate intermediate assembly and starboard bottom inclined plate intermediate assembly, and the templates are fitted to the surfaces of the turning circles to assist in fixing and prevent deformation; then sequentially install the bottom middle longitudinal bulkhead intermediate assembly, bottom port / starboard transverse bulkhead intermediate assembly, port / starboard bottom inclined plate intermediate assembly bottom port / starboard end wall intermediate assembly;

[0017] After positioning is completed, the welding robot that walks on the surface of the plate material welds the joints of each assembled part, and the gap between adjacent angle steels can accommodate the welding robot to pass through.

[0018] Optionally, in step S3, the middle support tooling includes a portal frame. The portal frame includes a support beam arranged in the left-right direction and vertical support columns fixed to the lower surface of the support beam. Two parallel portal frames are connected by a connecting beam to form a frame pair. Multiple frame pairs are evenly arranged in the fore-and-aft direction. The gap between adjacent vertical support columns can accommodate the transport vehicle. A vertical support frame is vertically fixed on the upper surface of the connecting beam. Three groups of vertical support frames are arranged in the left-right direction and are used to assist in fixing each middle assembled part;

[0019] During construction, first install the middle longitudinal bulkhead middle assembled part, and then install the middle left / right side transverse bulkhead middle assembled part, the middle left / right side end bulkhead middle assembled part, and the left / right side outer plate middle assembled part in sequence. After the assembly is completed, uniformly arrange the welding robots for centralized welding.

[0020] Optionally, in step S4, the upper support tooling includes a portal frame. The portal frame includes a support beam arranged in the left-right direction and vertical support columns fixed to the lower surface of the support beam. Two parallel portal frames are connected by a connecting beam to form a frame pair. Multiple frame pairs are evenly arranged in the fore-and-aft direction. The gap between adjacent vertical support columns can accommodate the transport vehicle. A vertical support frame is vertically fixed on the upper surface of the connecting beam. Multiple groups of vertical support frames are arranged in the left-right direction. From the left and right sides to the center, the height of the vertical support frames gradually increases. Multiple groups of vertical support frames are symmetrically distributed left and right, so as to adapt to the upper cover-like shape. Multiple vertical support frames are used to assist in fixing each middle assembled part;

[0021] During construction, first install the top longitudinal bulkhead middle assembled part, and then install the top plate middle assembled part, the left / right inclined top plate middle assembled part, the top middle end bulkhead middle assembled part, and the top left / right side end bulkhead middle assembled part in sequence. After the assembly is completed, then uniformly arrange the welding robots for centralized welding.

[0022] Optionally, in step S5, arrange the structural lifting lugs on the upper surface of the tank body, and use the transport vehicle to transfer the middle part and the upper part to the welding and assembly platform with a giant gantry crane; lift the upper part onto the middle part to form a 2 / 3 tank; after the lifting is completed, first spot-weld and fix it, and use the transport vehicle to transfer the 2 / 3 tank to other sites to complete the welding of the 2 / 3 tank closing seam.

[0023] Optionally, in step S6, after the welding of the 2 / 3 tank closing seam is completed and the outfitting and piping work are completed, use the transport vehicle to transfer the lower part and the 2 / 3 tank to the welding and assembly platform with a giant gantry crane, lift the 2 / 3 tank onto the lower part, first spot-weld and fix it, and then use the transport vehicle to transfer it to other sites to complete the welding work of the whole tank closing.

[0024] Optionally, a straight ladder and a working platform are installed on the supporting tooling.

[0025] As described above, the present invention provides a construction method for a rhombic liquid tank. The construction method first divides the rhombic liquid tank into frameworks. The lying octagonal prism-shaped rhombic liquid tank is cut into three parts along the horizontal section, including the upper part, the middle part and the lower part. Each part approximately accounts for 1 / 3 of the total volume. Each part is divided into multiple intermediate assemblies. Special supporting tooling is designed for the upper part, the middle part and the lower part to assist in fixing each intermediate assembly. After the intermediate assemblies are assembled, welding robots are centrally arranged for welding. After the upper part, the middle part and the lower part are respectively constructed, they are then butt-joined and closed to complete the construction of the entire rhombic liquid tank. The construction method of the present invention cancels the large-group construction process, optimizes the general-group construction method, breaks through the construction site restrictions, saves core resources such as cranes and sites in the shipbuilding berth or dock area, reduces the erection and dismantling of scaffolds, promotes the application of welding robots, and at the same time shortens the construction period of the rhombic liquid tank, greatly improving the liquid tank construction efficiency and construction cost. Brief Description of the Drawings

[0026] Figure 1 It shows a schematic cross-sectional view of a typical prismatic liquid tank in Embodiment 1 of the present invention.

[0027] Figure 2 It shows a schematic diagram of the rhombic liquid tank divided according to 1 / 3 in Embodiment 1 of the present invention.

[0028] Figure 3 It shows a schematic diagram of the division of the intermediate assembly of the bow and stern end walls of the liquid tank in Embodiment 1 of the present invention.

[0029] Figure 4 It shows a schematic diagram of the division of the intermediate assembly of the typical cross-section of the liquid tank in Embodiment 1 of the present invention.

[0030] Figure 5 It shows a schematic diagram of the supporting tooling for the lower 1 / 3 tank in Embodiment 1 of the present invention.

[0031] Figure 6 It shows a schematic diagram of the horizontal layout of the supporting tooling for the lower 1 / 3 tank in Embodiment 1 of the present invention.

[0032] Figure 7 It shows a schematic diagram of the general assembly of the lower 1 / 3 tank in Embodiment 1 of the present invention.

[0033] Figure 8 It shows a schematic diagram of the supporting tooling for the middle 1 / 3 tank in Embodiment 1 of the present invention.

[0034] Figure 9 It shows a schematic diagram of the horizontal layout of the supporting tooling for the middle 1 / 3 tank in Embodiment 1 of the present invention.

[0035] Figure 10Shown is a schematic diagram of the overall assembly of the middle 1 / 3 tank in the first embodiment of the present invention.

[0036] Figure 11 Shown is a schematic diagram of the support tooling for the upper 1 / 3 tank in the first embodiment of the present invention.

[0037] Figure 12 Shown is a schematic diagram of the horizontal layout of the support tooling for the upper 1 / 3 tank in the first embodiment of the present invention.

[0038] Figure 13 Shown is a schematic diagram of the overall assembly of the upper 1 / 3 tank in the first embodiment of the present invention.

[0039] Figure 14 Shown is a schematic diagram of the overall assembly of the 2 / 3 tank in the first embodiment of the present invention.

[0040] Figure 15 Shown is a schematic diagram of the closing of the entire tank in the first embodiment of the present invention.

[0041] Description of component labels

[0042] Upper part 100, middle part 200, lower part 300, bottom support tooling 101, support beam 11, vertical support column 12, angle steel 13, transport vehicle 21, straight ladder 22, platform 23, middle support tooling 201, connecting beam 14, vertical support frame 15, upper support tooling 301. Specific implementation manners

[0044] The following uses specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0045] It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0046] Embodiment 1

[0047] As Figures 1 to 15 shown, this embodiment provides a construction method for a rhombic liquid tank, including the following steps:

[0048] S1: Divide the rhombic liquid tank into structural parts. The rhombic liquid tank is a horizontal octagonal prism, including two end faces and eight side faces. The two end faces are the bow face and the stern face, both of which are octagonal faces, and the eight side faces are rectangular faces. There are fillets at the joints of the eight side faces, as Figure 1 shown to form an arc transition.

[0049] Cut the rhombic liquid tank into three parts along the horizontal section, as Figure 2 shown, including the upper part 100, the middle part 200 and the lower part 300. Each part accounts for about 1 / 3 of the total volume. The longitudinal sections of the upper and lower parts are trapezoids, and the longitudinal section of the middle part is a rectangle.

[0050] As Figure 3 shown, the end faces are divided into the bottom starboard end wall intermediate assembly and the bottom port end wall intermediate assembly located in the lower part, the middle starboard end wall intermediate assembly and the middle port end wall intermediate assembly located in the middle part, and the top starboard end wall intermediate assembly, the top port end wall intermediate assembly and the top middle end wall intermediate assembly located in the upper part.

[0051] As Figure 4 shown, the eight side faces are divided into the bottom plate intermediate assembly (including the starboard bottom plate intermediate assembly and the port bottom plate intermediate assembly), the starboard bottom inclined plate intermediate assembly, the port bottom inclined plate intermediate assembly located in the lower part, the starboard side outer plate intermediate assembly and the port side outer plate intermediate assembly located in the middle part, and the top plate intermediate assembly, the starboard inclined top plate intermediate assembly and the port inclined top plate intermediate assembly located in the upper part.

[0052] In the cavities formed by the end faces and side faces in the lower part, there are arranged the bottom starboard transverse bulkhead intermediate assembly, the bottom port transverse bulkhead intermediate assembly and the bottom centerline longitudinal bulkhead intermediate assembly; in the cavities formed by the end faces and side faces in the middle part, there are arranged the middle starboard transverse bulkhead intermediate assembly, the middle port transverse bulkhead intermediate assembly and the middle centerline longitudinal bulkhead intermediate assembly; in the cavities formed by the end faces and side faces in the upper part, there is arranged the top centerline longitudinal bulkhead intermediate assembly. Among them, the transverse bulkhead intermediate assemblies are arranged perpendicular to the bow-stern direction, the centerline longitudinal bulkhead intermediate assemblies are arranged perpendicular to the port-starboard direction, and the transverse bulkhead intermediate assemblies are located between the starboard and port transverse bulkhead intermediate assemblies.

[0053] S2: As Figures 5 to 7 shown, arrange the bottom support tooling 101 to construct the lower part. The bottom support tooling 101 includes a portal frame. The portal frame includes a support beam 11 arranged along the port-starboard direction and vertical support columns 12 fixed to the lower surface of the support beam 11. Vertical angle steels 13 arranged along the port-starboard direction are fixed to the upper surface of the support beam 11. Multiple bottom support toolings are arranged evenly along the bow-stern direction; the gaps between adjacent vertical support columns 12 can accommodate the transport vehicle 21 to facilitate handling.

[0054] Place the starboard bottom plate sub - assembly, port bottom plate sub - assembly, port bottom inclined plate sub - assembly, and starboard bottom inclined plate sub - assembly on the top of the angle steel of the bottom support tooling. Among them, support templates are padded at the turning circles of the port bottom inclined plate sub - assembly and the starboard bottom inclined plate sub - assembly, and the templates are fitted to the surface of the turning circles to assist in fixing and prevent deformation. Since the turning part of the liquid tank is a structure with a line type, it is difficult to control the accuracy during positioning and installation. This bottom support tooling is designed with welded fixed support templates (a steel plate that fits the line type of the turning part of the liquid tank) at the turning part to ensure the installation accuracy of the lower part of the tank body in the line - type area;

[0055] Then, install the bottom middle longitudinal bulkhead sub - assembly, bottom port / starboard transverse bulkhead sub - assemblies, and port / starboard bottom inclined plate sub - assemblies in sequence. After that, install the lower part of the end face for capping at both the bow and stern ends, that is, install the bottom port / starboard end bulkhead sub - assemblies.

[0056] After positioning, a welding robot walking on the surface of the plate welds the joints of each sub - assembly. The gap between adjacent angle steels can accommodate the welding robot to pass through. During the positioning process, local spot welding can also be used for temporary auxiliary fixing. In addition, a straight ladder 22 and a platform 23 are fixed above the support tooling, which is convenient for welding the closing seam and reduces the erection and demolition of the scaffolding.

[0057] S3: As Figures 8 to 10 shown, arrange the middle support tooling 201 to build the middle part. The middle support tooling 201 includes a portal frame. The portal frame includes a support beam 11 arranged in the left - right direction and vertical support columns 12 fixed to the lower surface of the support beam. Two parallel portal frames are connected by a connecting beam 14 to form a frame pair. Multiple frame pairs are evenly arranged in the bow - stern direction. The gap between adjacent vertical support columns 12 can accommodate a transport vehicle to facilitate handling. A vertical support frame 15 is vertically fixed to the upper surface of the connecting beam 14. Three groups of vertical support frames are arranged in the left - right direction to assist in fixing each sub - assembly. A straight ladder and a working platform are installed on the side wall of the vertical support frame for convenient construction.

[0058] First, install the middle middle longitudinal bulkhead sub - assembly, and then install the middle port / starboard transverse bulkhead sub - assemblies, middle port / starboard end bulkhead sub - assemblies, and port / starboard side outer plate sub - assemblies in sequence. During the assembling process, the sub - assembly sheets can also be spot - welded first, and after the assembling is completed, the welding robot can be arranged to weld them centrally.

[0059] S4: As Figures 11 to 13As shown in the figure, the upper support tooling 301 is arranged to construct the upper part. The upper support tooling 301 includes a gantry frame. The gantry frame includes a support beam 11 arranged in the left-right direction and vertical support columns 12 fixed to the lower surface of the support beam 11. Two parallel gantry frames are connected by a connecting beam 14 to form a frame pair. Multiple frame pairs are evenly arranged in the fore-and-aft direction. The gap between adjacent vertical support columns can accommodate a transport vehicle to facilitate handling. A vertical support frame 15 is vertically fixed to the upper surface of the connecting beam 14. Multiple groups of vertical support frames 15 are arranged in the left-right direction. From the left and right sides to the center, the height of the vertical support frame gradually increases. Multiple groups of vertical support frames 15 are symmetrically distributed left and right to adapt to the cover-like outer shape of the upper part. Multiple vertical support frames are used to assist in fixing each intermediate assembly. A straight ladder and a working platform are installed on the side wall of the vertical support frame for easy construction.

[0060] First, install the intermediate assembly of the top longitudinal bulkhead, and then install the intermediate assembly of the top plate, the intermediate assembly of the left / right inclined top plate, the intermediate assembly of the top middle end wall, and the intermediate assembly of the top left / right end wall in sequence. During the assembly process, the intermediate assembly sheets can also be spot-welded first. After 1 / 3 of the tank is assembled, the welding robots can be centrally arranged for welding.

[0061] S5: As Figure 14 shown in the figure, the middle part is docked with the upper part. Structural lifting lugs are arranged on the surface of the upper tank body. To make full use of the structural lifting lugs of the liquid tank itself, in the first step, use a transport vehicle to transfer 1 / 3 of the middle tank and 1 / 3 of the upper tank to the welding and assembly platform with a giant gantry crane; in the second step, lift 1 / 3 of the upper tank onto 1 / 3 of the middle tank to form a 2 / 3 tank; in the third step, to avoid wasting the lifting resources on the site, after the lifting is completed, first spot-weld and fix it, and use a transport vehicle to transfer the 2 / 3 tank to other sites to complete the welding of the closing seam of the 2 / 3 tank.

[0062] S6: As Figure 15 shown in the figure, the whole tank is docked and closed. After the welding of the closing seam of the 2 / 3 tank is completed and the relevant professional work such as outfitting and pipe system is completed, use a transport vehicle to transfer 1 / 3 of the bottom tank and the 2 / 3 tank to the welding and assembly platform with a giant gantry crane. Lift the 2 / 3 tank onto 1 / 3 of the lower tank, and it can be spot-welded first. In the third step, use a transport vehicle to transfer it to other sites to complete the welding work of the whole tank closing.

[0063] In summary, the present invention provides a construction method for a rhombic liquid tank. The construction method first divides the structure of the rhombic liquid tank. The lying octagonal prism-shaped rhombic liquid tank is cut into three parts along the horizontal section, including the upper part, the middle part and the lower part, and each part accounts for about 1 / 3 of the total volume. Each part is divided into multiple intermediate assemblies. Special support tooling is designed for the upper part, the middle part and the lower part to assist in fixing each intermediate assembly. After the intermediate assemblies are assembled, a welding robot is centrally arranged for welding. After the upper part, the middle part and the lower part are respectively constructed, they are docked and closed to complete the construction of the entire rhombic liquid tank. The construction method of the present invention cancels the large assembly construction process, optimizes the general assembly construction method, breaks through the construction site restrictions, saves core resources such as cranes and sites in the shipbuilding berth or dock area, reduces the erection and dismantling of scaffolding, promotes the application of welding robots, shortens the construction cycle of the rhombic liquid tank, and greatly improves the construction efficiency and construction cost of the liquid tank.

[0064] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A method for constructing a rhombic liquid tank, characterized in that, The steps are as follows: S1: Divide the rhombic liquid tank in terms of its structure. The rhombic liquid tank is a horizontal octagonal prism, including two end faces and eight side faces. The two end faces are the bow face and the stern face, both of which are octagonal faces, and the eight side faces are rectangular faces. There are fillets at the joints of the eight side faces to form an arc transition. The rhombic liquid tank is cut into three parts along the horizontal section, including the upper part, the middle part, and the lower part. The longitudinal sections of the upper part and the lower part are trapezoids, and the longitudinal section of the middle part is a rectangle; S2: Arrange the bottom support tooling and construct the lower part; S3: Arrange the middle support tooling and construct the middle part; S4: Arrange the upper support tooling and construct the upper part; S5: Connect the middle part and the upper part and combine them into a 2 / 3 tank; S6: Connect the 2 / 3 tank and the lower part to complete the welding of the whole tank.

2. The construction method of the rhombic liquid tank according to claim 1, characterized in that: In step S1, for the end faces, they are divided into the bottom port side end wall intermediate assembly located in the lower part, the bottom starboard side end wall intermediate assembly, the middle port side end wall intermediate assembly and the middle starboard side end wall intermediate assembly located in the middle part, and the top port side end wall intermediate assembly, the top starboard side end wall intermediate assembly, and the top middle end wall intermediate assembly located in the upper part; The eight side faces are divided into the bottom plate intermediate assembly located in the lower part, the port side bottom inclined plate intermediate assembly, the starboard side bottom inclined plate intermediate assembly, the port side side outer plate intermediate assembly and the starboard side side outer plate intermediate assembly located in the middle part, and the top plate intermediate assembly, the port side inclined top plate intermediate assembly, and the starboard side inclined top plate intermediate assembly located in the upper part; The bottom plate intermediate assembly includes the port side bottom plate intermediate assembly and the starboard side bottom plate intermediate assembly; Inside the cavities formed by the end faces and side faces in the lower part, there are arranged the bottom port side transverse bulkhead intermediate assembly, the bottom starboard side transverse bulkhead intermediate assembly, and the bottom middle longitudinal bulkhead intermediate assembly; Inside the cavities formed by the end faces and side faces in the middle part, there are arranged the middle port side transverse bulkhead intermediate assembly, the middle starboard side transverse bulkhead intermediate assembly, and the middle middle longitudinal bulkhead intermediate assembly; Inside the cavities formed by the end faces and side faces in the upper part, there is arranged the top middle longitudinal bulkhead intermediate assembly; Among them, the transverse bulkhead intermediate assemblies are arranged perpendicular to the bow-stern direction, the middle longitudinal bulkhead intermediate assemblies are perpendicular to the left-right direction, and the transverse bulkhead intermediate assemblies are located between the port side and starboard side transverse bulkhead intermediate assemblies.

3. The construction method of the rhombic liquid tank according to claim 2, characterized in that: In step S2, the bottom support tooling includes a portal frame. The portal frame includes a support beam arranged along the left-right direction and vertical support columns fixed to the lower surface of the support beam. On the upper surface of the support beam, there are fixed multiple vertical angle steels arranged along the left-right direction. Multiple bottom support toolings are evenly arranged along the bow-stern direction; The gap between adjacent vertical support columns can accommodate a transport vehicle; Place the port side bottom plate intermediate assembly, the starboard side bottom plate intermediate assembly, the port side bottom inclined plate intermediate assembly, and the starboard side bottom inclined plate intermediate assembly on the top ends of the angle steels of the bottom support tooling. Among them, support templates are padded at the fillets of the port side bottom inclined plate intermediate assembly and the starboard side bottom inclined plate intermediate assembly, and the templates are attached to the surfaces at the fillet positions to assist in fixing and prevent deformation; Then, install the bottom middle longitudinal bulkhead intermediate assembly, the bottom port / starboard side transverse bulkhead intermediate assembly, and the port / starboard side bottom inclined plate intermediate assembly and the bottom port / starboard side end wall intermediate assembly in sequence; After positioning, use a welding robot walking on the surface of the plates to weld the joints of each intermediate assembly. The gap between adjacent angle steels can accommodate the welding robot to pass through.

4. The construction method of the rhombic liquid tank according to claim 2, characterized in that: In step S3, the middle support tooling includes a gantry frame. The gantry frame includes a support beam arranged in the left-right direction and vertical support columns fixed to the lower surface of the support beam. Two parallel gantry frames are connected by a connecting beam to form a frame pair. Multiple frame pairs are evenly arranged in the fore-and-aft direction. The gap between adjacent vertical support columns can accommodate a transport vehicle. A vertical support frame is vertically fixed to the upper surface of the connecting beam. Three groups of vertical support frames are arranged in the left-right direction to assist in fixing each intermediate assembly. During construction, first install the middle longitudinal bulkhead intermediate assembly, and then install the middle left / right side transverse bulkhead intermediate assemblies, the middle left / right side end bulkhead intermediate assemblies, and the left / right side outer plate intermediate assemblies in sequence. After the assembly is completed, arrange for welding robots to perform centralized welding.

5. The construction method of the rhombic liquid tank according to claim 2, characterized in that: In step S4, the upper support tooling includes a gantry frame. The gantry frame includes a support beam arranged in the left-right direction and vertical support columns fixed to the lower surface of the support beam. Two parallel gantry frames are connected by a connecting beam to form a frame pair. Multiple frame pairs are evenly arranged in the fore-and-aft direction. The gap between adjacent vertical support columns can accommodate a transport vehicle. A vertical support frame is vertically fixed to the upper surface of the connecting beam. Multiple groups of vertical support frames are arranged in the left-right direction. From the left and right sides to the center, the height of the vertical support frames gradually increases. Multiple groups of vertical support frames are symmetrically distributed left and right to adapt to the upper cover-like shape. Multiple vertical support frames are used to assist in fixing each intermediate assembly. During construction, first install the top longitudinal bulkhead intermediate assembly, and then install the top plate intermediate assembly, the left / right inclined top plate intermediate assemblies, the top middle end bulkhead intermediate assembly, and the top left / right side end bulkhead intermediate assemblies in sequence. After the assembly is completed, arrange for welding robots to perform centralized welding.

6. The construction method of the rhombic liquid tank according to claim 2, characterized in that: In step S5, arrange structural lifting lugs on the upper surface of the tank body, and use a transport vehicle to transfer the middle and upper parts to a welding and assembly platform equipped with a giant gantry crane; lift the upper part onto the middle part to form a 2 / 3 tank; after the lifting is completed, first perform spot welding for fixation, and use a transport vehicle to transfer the 2 / 3 tank to other sites to complete the welding of the 2 / 3 tank closing seam.

7. The construction method of the rhombic liquid tank according to claim 2, characterized in that: In step S6, after the welding of the 2 / 3 tank closing seam is completed and the outfitting and piping work are completed, use a transport vehicle to transfer the lower part and the 2 / 3 tank to a welding and assembly platform equipped with a giant gantry crane. Lift the 2 / 3 tank onto the lower part, first perform spot welding for fixation, and then use a transport vehicle to transfer it to other sites to complete the welding work of the entire tank closing seam.

8. The construction method of the rhombic liquid tank according to claim 1, characterized in that: The support tooling is equipped with a straight ladder and a working platform.

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