A method of building a channel in segments and a channel built in segments

Abstract

The present application relates to a step one tank segment construction method and tank segment, the tank segment is divided into several segments, the same components of different tank segments are made on the same jig, the V-shaped tank small group is made on the same jig, the upper deck is made on the same jig, the U-shaped tank longitudinal wall plate is installed above the upper deck in the inverted state, the supporting longitudinal wall is installed above the V-shaped small group in the inverted state to form the middle group of the tank segment, the triangular cabin small group is loaded on the V-shaped tank middle group in the normal state, the whole is hoisted and loaded above the lower deck to form a tank segment, and the tank segments are connected along the length direction to form a complete tank segment. The same components of different tank segments are made on the same jig, the accuracy of the components of different tank segments is relatively consistent, the construction error between different tank segments is reduced, and the error of the joint of different tank segments is reduced.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding, specifically to a method for constructing tank sections and the tank sections themselves. Background Technology

[0002] In ship hull structures, some sections contain internal channel structures, such as U-shaped and V-shaped channels. These channel sections require high overall precision and precise alignment between the fore-and-aft sections during construction, making precision control during fabrication difficult. Reducing the number of sections to make individual sections larger can alleviate alignment issues, but it increases the requirements for steel dimensions, processing equipment, and the difficulty of assembly and lifting. For shipyards, replacing processing and lifting equipment is too costly and does not meet actual production requirements. Conversely, increasing the number of sections to reduce steel dimensions can easily lead to alignment problems during the alignment process. Summary of the Invention

[0003] To address the problems existing in the construction of existing tank sections, this invention provides a method for constructing tank sections and a tank sectioning method. The method of this invention makes it easy to control the docking accuracy while ensuring that the number of sections meets the production requirements of shipyards.

[0004] The technical objective of this invention is achieved through the following technical solution:

[0005] A method for constructing a tank in segments, the method comprising:

[0006] Step 1: Divide the tank into several sections. Each section includes the erection of the V-shaped tank assembly, the upper deck, the triangular compartment assembly, the U-shaped tank longitudinal wall, the supporting longitudinal wall, and the lower deck. The same components of different tank sections are assembled on the same jig.

[0007] Step 2: The V-shaped trough sub-assembly and the upper deck are fabricated in reverse on the same jig; the triangular compartment sub-assembly, the U-shaped trough longitudinal bulkhead, the supporting longitudinal bulkhead, and the lower deck are fabricated on jigs separately.

[0008] Step 3: Install the U-shaped longitudinal wall panels above the upper deck in the reverse state, and assemble them in the trough segment above the V-shaped sub-assembly in the reverse state, where the supporting longitudinal walls are installed.

[0009] Step 4: Assemble the normally mounted triangular compartment into the V-shaped channel; hoist the entire assembly onto the lower deck to form a section of the channel.

[0010] Step 5: Segment the tank along its length to form a complete tank segment.

[0011] Furthermore, in step 2, the V-groove sub-assembly and the upper deck assembly on the linear jig frame include the following steps:

[0012] S21. Fabrication of linear jig frame: The linear jig frame includes jig frame columns and linear jig plates, with the jig frame columns supported below the linear jig plates; the center line of the linear jig frame is marked on the ground.

[0013] S22, the V-shaped trough assembly includes a trough bottom plate and trough inclined plates set on both sides of the trough bottom plate, with an obtuse angle between the trough inclined plates and the trough bottom plate;

[0014] The bottom plate of the tank is positioned on the linear jig with the center line of the jig as a reference. The center line of the bottom plate of the tank is aligned vertically with the center line of the jig, and the bottom plate of the tank is spot-welded to the jig.

[0015] S23. Lay the inclined plates of the tank body on the linear jigs on both sides along the bottom plate of the tank body. The inclined plates of the tank body are positioned with the bottom plate of the tank body as the reference. The inclined plates of the tank body are spot welded to the jig brackets.

[0016] S24. The upper deck is assembled on the linear jig along the inclined plate of the trough, and the upper deck is spot-welded to the jig.

[0017] S25. After the panels are assembled, the joints are welded.

[0018] Furthermore, in step 2, the V-groove group assembly is equipped with three linear jigs of the first, middle and last sections with transverse reinforcement. After the segmented assembly is completed, the linear jigs and transverse reinforcements are cut off together with the segmented assembly for hoisting and turning.

[0019] Furthermore, in step 2, the triangular compartment assembly includes a triangular compartment deck panel, a triangular compartment longitudinal bulkhead, and a triangular elbow plate. The jig used for assembling the triangular compartment assembly includes a column-type jig and a slot-type jig. The slot-type jig has a slot facing upward that matches the thickness of the triangular compartment deck panel. The slot-type jig is located on one side of the column-type jig, and the bottom height of the slot is lower than the upper support surface of the column-type jig.

[0020] When assembling the triangular cabin group on the jig, the longitudinal bulkhead of the triangular cabin is placed horizontally on the upper support surface of the column-type jig. The longitudinal bulkhead of the triangular cabin is spot-welded to the column-type jig. The triangular cabin deck panel is divided into a first deck panel and a second deck panel. Then, the second deck panel is inserted longitudinally into the slot of the slot-type jig. The end of the second deck panel is adjusted to be flush with the end of the longitudinal bulkhead of the triangular cabin, so that the side of the longitudinal bulkhead of the triangular cabin near the slot-type jig is perpendicular to the second deck panel. The longitudinal bulkhead of the triangular cabin and the second deck panel are spot-welded to fix them. The first deck panel is not installed yet. It is installed after the triangular cabin group is assembled in the V-groove. Then, the installation lines of the triangular elbow plates are drawn on the longitudinal bulkhead of the triangular cabin, and the triangular elbow plates are installed one by one.

[0021] Furthermore, when assembling the normally mounted triangular cabin group in the V-shaped groove, the longitudinal wall plates and triangular elbow plates of the triangular cabin are welded and fixed to the inclined plates of the groove, and then the first deck panel is installed, and the two sides of the first deck panel are welded and fixed to the upper deck and the second deck panel, respectively.

[0022] Furthermore, after the V-shaped channel assembly, upper deck, triangular compartment assembly, U-shaped channel longitudinal wall, support longitudinal wall, and lower deck panel fabrication and welding are completed, the frame is marked and installed. When marking the frame, a welding shrinkage value of 0.3-0.8mm is added in advance. At the intersection of the frame and panel weld, the weld is first ground smooth, and the frame is positioned along the frame marking. After positioning, it is fixed by spot welding. When fully welding, the frames are welded by intermittent welding.

[0023] Furthermore, the triangular cabin assembly is performed using double-sided welding during the complete welding process. After one side is welded, it is flipped over for carbon gouging before welding the other side. After the double-sided welding is completed, 100% UT flaw detection is performed. After the flaw detection is qualified, the straightness of the triangular cabin assembly is measured. If the straightness is qualified, channel steel reinforcement is installed on the triangular elbow plate.

[0024] The present invention also provides a tank segment, including a V-shaped tank assembly, an upper deck, a triangular compartment assembly, a U-shaped tank longitudinal wall, a supporting longitudinal wall, and a lower deck. The upper deck is located above the lower deck. The U-shaped tank longitudinal wall is vertically supported between the upper deck and the lower deck. The V-shaped tank assembly is located above the upper deck and between the two U-shaped tank longitudinal walls. The supporting longitudinal wall is supported between the lower middle part of the V-shaped tank assembly and the upper part of the lower deck. The triangular compartment assembly is located inside the V-shaped tank assembly and is located near the upper two edges of the V-shaped tank assembly.

[0025] Furthermore, the triangular compartment assembly includes a triangular compartment deck panel, a triangular compartment longitudinal bulkhead, and a triangular elbow plate. The triangular compartment deck panel is connected to the upper deck on one side, the triangular compartment longitudinal bulkhead is vertically fixed to the lower end face near the other side of the triangular compartment deck panel, and the triangular elbow plate is perpendicular to the triangular compartment deck panel and the triangular compartment longitudinal bulkhead and is located between the triangular compartment deck panel and the triangular compartment longitudinal bulkhead.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. This invention divides the tank into several segments along its length. The same components on different tank segments are assembled on the same jig, which ensures the relative consistency of the precision of the components on different tank segments, reduces the construction error between different tank segments, and thus reduces the error of assembling and splicing different tank segments.

[0028] 2. In the fabrication of the triangular compartment assembly in this invention, the separate construction of the triangular compartment assembly ensures the accuracy of its straightness and flatness. The combination of the column-type jig and the slot-type jig improves its assembly accuracy, providing a good accuracy foundation for subsequent assembly.

[0029] 3. After the segmented assembly is completed in this invention, the linear jig and transverse reinforcement are cut off together with the segmented assembly for hoisting and turning. The linear jig and transverse reinforcement provide structural reinforcement for the hoisting and turning of the segmented assembly, avoiding deformation during hoisting and ensuring the subsequent mounting accuracy. Attached Figure Description

[0030] Figure 1 This is a schematic cross-sectional view of the tank section in this invention.

[0031] Figure 2 This is a schematic diagram of the upper plate of the linear tire plate type tire frame in this invention.

[0032] Figure 3 This is a schematic diagram of the installation of the U-shaped groove longitudinal wall and the supporting longitudinal wall in this invention.

[0033] Figure 4 This is a schematic diagram of the assembly and fabrication of the triangular cabin group in this invention.

[0034] Figure 5 This is a schematic diagram of the tank segmentation along the length direction in this invention.

[0035] Figure 6 This is a schematic diagram of the installation of the first deck surface in this invention.

[0036] In the picture:

[0037] 1. Upper deck; 2. U-shaped longitudinal bulkhead; 3. Supporting longitudinal bulkhead; 4. Lower deck; 5. Tank bottom plate; 6. Tank inclined plate; 7. Triangular compartment deck panel; 8. Triangular compartment longitudinal bulkhead; 9. Triangular elbow plate; 10. Tank bottom plate centerline; 11. Rack support column; 12. Linear rack plate; 13. Rack centerline; 14. Lateral reinforcement; 15. Column-type rack; 16. Slotted rack plate; 17. Rack support column; 18. First deck panel; 19. Second deck panel; 20. Steel liner. Detailed Implementation

[0038] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0039] A method for constructing a tank in segments, the method comprising:

[0040] Step 1: Divide the tank into several segments, such as... Figure 5 As shown, each section is 10-15 meters long. Each section of the tank includes a V-shaped tank assembly, an upper deck 1, a triangular compartment assembly, a U-shaped tank longitudinal wall 2, supporting longitudinal walls 3, and a lower deck 4, as shown. Figure 1 As shown, identical components of different sections of the tank are assembled on the same jig. For example, if the tank is divided into 4 sections, identical components of some sections can be assembled on the same jig. If the site permits, identical components of all sections can also be assembled on the same jig. For example, two triangular compartments can be assembled on the same linear jig.

[0041] More specifically, the V-shaped trough assembly can be further divided into a trough bottom plate 5 and a trough inclined plate 6, and the triangular compartment assembly can be further divided into a triangular compartment deck panel 7, a triangular compartment longitudinal bulkhead 8, and a triangular elbow plate 9. It should be noted that in this embodiment, the V-shaped trough in the V-shaped trough assembly refers to the V-shaped angle formed between the trough bottom plate 5 and the lateral trough inclined plate 6, and the V-shaped angle is an obtuse angle. The entire V-shaped trough assembly has an inverted trapezoidal structure. In this embodiment, the U-shape of the U-shaped trough longitudinal wall refers to the U-shaped structure formed between the two U-shaped trough longitudinal walls 2 and the lower deck 4.

[0042] Step 2: The V-shaped trough sub-assembly and the upper deck are fabricated in reverse on the same linear jig; the triangular compartment sub-assembly is fabricated on a customized jig, and the U-shaped trough longitudinal wall, support longitudinal wall and lower deck are fabricated on a column jig; for the corresponding flat structure, the levelness of the jig should be controlled within ±1mm.

[0043] As a preferred option, after the V-shaped channel assembly, upper deck, triangular compartment assembly, U-shaped channel longitudinal wall, supporting longitudinal wall, and lower deck panel are fabricated and welded, the frame is marked and installed. When marking the frame, a welding shrinkage value of 0.3-0.8mm is added in advance. For example, if the theoretical spacing between ribs is 600mm, the frame can be marked according to 600.6mm. If the theoretical spacing between longitudinal ribs is 500mm, the frame can be marked according to 500.5mm.

[0044] At the intersection of the frame and the weld seam of the panel, the weld seam is first ground smooth to reduce the assembly gap. The frame is then positioned along the marked lines and fixed by spot welding. When welding completely, an automatic fillet welder can be used to improve welding efficiency. Welding is performed in a step-by-step manner for each section. Welding is done between sections by skipping sections, that is, after welding one section, the next section is welded without skipping the previous section to reduce welding deformation.

[0045] Since the U-shaped channel longitudinal walls, supporting longitudinal walls, and lower deck are planar structures, these structures can be assembled and welded on a column-type jig. After welding, the framework is marked, and then the framework is installed according to the framework marking, including ribs and longitudinals, which are perpendicular to each other.

[0046] Because of its inverted trapezoidal tank structure, the V-shaped trough assembly is fabricated by welding plates together on a linear jig. Since the upper deck is adjacent to the side plates of the V-shaped trough assembly, the upper deck is also fabricated by welding plates together on the same linear jig as the V-shaped trough assembly.

[0047] Due to the special nature of the structure, the flatness and straightness of the triangular cabin assembly need to be strictly controlled. Therefore, the triangular cabin assembly is made by splicing and welding panels on a custom-made jig.

[0048] More specifically, the fabrication of the V-groove assembly and the welding of the upper deck panels includes the following steps:

[0049] S21, linear tire plate type tire frame manufacturing, such as Figure 2 As shown, the linear tire plate type frame includes a frame column 11 and a linear tire plate 12, with the frame column 11 supported below the linear tire plate 12; the center line 13 of the linear tire plate type frame is marked on the ground;

[0050] S22. Position the bottom plate 5 of the tank body on the linear jig with the center line 13 of the jig as the reference. Draw the center line 10 of the bottom plate of the tank body on the bottom plate 5. The center line 10 of the bottom plate of the tank body is aligned with the center line 13 of the jig. The bottom plate of the tank body and the jig are spot welded together.

[0051] S23. Lay the inclined plate 6 of the tank body on the linear jig 12 on both sides of the bottom plate 5 of the tank body. The inclined plate 6 of the tank body is positioned with the bottom plate 5 of the tank body as the reference. The inclined plate 6 of the tank body is fixed by spot welding to the jig.

[0052] S24. The upper deck 1 is assembled on the linear jig 12 along the inclined plate 6 of the trough body, and the upper deck 1 is spot welded to the jig frame.

[0053] S25. After the panels are assembled, the joints are welded. After welding, the framework lines are marked on the upper deck 1, the inclined plate 6 of the tank and the bottom plate 5 of the tank. The framework is then positioned, welded and installed according to the framework lines.

[0054] As a preferred option, the jig for the V-shaped trough assembly uses three sections of linear jig plates with transverse reinforcement 14. The transverse reinforcement 14 is set parallel to the linear jig plate 12. After the mid-section assembly is completed, the linear jig plate and transverse reinforcement are cut off together with the mid-section assembly for hoisting and turning. The transverse reinforcement 14 is like channel steel to prevent the trough part of the V-shaped trough assembly from deforming during hoisting.

[0055] The jig used for the assembly of the triangular cabin includes a column-type jig 15 and a slotted jig 16. The slotted jig 16 has an upward-facing slot that matches the thickness of the triangular cabin deck panel 7. The slotted jig 16 is located on one side of the column-type jig 15, and the bottom of the slot is lower than the upper support surface of the column-type jig 15, so that the side of the triangular cabin deck panel 7 extends outward relative to the triangular cabin longitudinal bulkhead 8. Figure 4 As shown.

[0056] When assembling the triangular cabin group on the jig, the longitudinal bulkhead 8 of the triangular cabin is placed horizontally on the upper support surface of the column jig 15. The longitudinal bulkhead 8 of the triangular cabin is spot-welded to the column jig 15. The triangular cabin deck panel 7 is divided into a first deck panel 18 and a second deck panel 19. Then, the second deck panel 19 is inserted longitudinally into the slot of the slot-type jig 16. The end of the second deck panel 19 is adjusted to be flush with the end of the longitudinal bulkhead 8 of the triangular cabin, so that the side of the longitudinal bulkhead 8 of the triangular cabin near the slot-type jig 16 is perpendicular to the second deck panel 19. The longitudinal bulkhead 8 of the triangular cabin and the second deck panel 19 are spot-welded to be fixed. The first deck panel 18 is not installed yet. It will be installed after the triangular cabin group is assembled in the V-groove.

[0057] Then, the installation lines for the triangular elbow plates are drawn on the longitudinal bulkhead 8 of the triangular compartment. The triangular elbow plates 9 are installed one by one along the length extension direction of the longitudinal bulkhead 8 of the triangular compartment. The triangular elbow plates 9 are connected to the longitudinal bulkhead 8 of the triangular compartment and the second deck panel 19 by spot welding, so that the triangular elbow plates 9 are perpendicular to the longitudinal bulkhead 8 of the triangular compartment and the second deck panel 19 respectively. After verifying the installation accuracy of the triangular elbow plates, the triangular elbow plates 9, the second deck panel 19 and the longitudinal bulkhead 8 of the triangular compartment are completely welded together.

[0058] When assembling the triangular cabin group, double-sided welding is used. After one side is welded, it is flipped over for carbon gouging before welding the other side. After double-sided welding, 100% UT flaw detection is performed. After the flaw detection is qualified, the straightness of the triangular cabin group assembly is measured. If the straightness is qualified, channel steel reinforcement is installed on the triangular elbow plate.

[0059] Step 3, as follows Figure 3 As shown, the U-shaped longitudinal wall plate 2 is installed above the upper deck 1 in the reverse state, and the supporting longitudinal wall 3 is installed above the V-shaped sub-assembly in the reverse state to form the trough segment assembly.

[0060] Specifically, the supporting longitudinal wall 3 is positioned with the center line 10 of the bottom plate of the tank body. The supporting longitudinal wall 3 is vertically positioned on the bottom plate of the tank body 5 and fixed by spot welding. The verticality of the supporting longitudinal wall 3 relative to the bottom plate of the tank body 5 is checked. After the inspection is qualified, the supporting longitudinal wall 3 and the bottom plate of the tank body 5 are completely welded together.

[0061] When installing the U-shaped longitudinal wall panel 2, mark the positioning line for the installation of the U-shaped longitudinal wall panel 2 on the upper deck 1, and fix the U-shaped longitudinal wall panel 2 vertically on the upper deck 1 along the positioning line by spot welding. Then, check the verticality of the U-shaped longitudinal wall panel 2. After the inspection is qualified, complete welding is performed.

[0062] To prevent deformation of the U-shaped longitudinal wall plate 2 and the supporting longitudinal wall 3 during subsequent hoisting and turning, channel steel can be added to reinforce the opening between the U-shaped longitudinal wall plate 2 and the supporting longitudinal wall 3.

[0063] Step 4: After the assembly in the V-shaped groove is flipped 180 degrees and placed in a normal position, the triangular cabin group is assembled in a normal position in the V-shaped groove. When assembling the triangular cabin longitudinal wall plate 8 and triangular elbow plate 9, they are welded and fixed to the groove inclined plate 6 respectively. Then, the first deck panel 18 is installed. The two sides of the first deck panel 18 are welded and fixed to the upper deck 1 and the second deck panel 19 respectively, to ensure that the upper deck 1, the first deck panel 18 and the second deck panel 19 are at the same horizontal height.

[0064] More specifically, to facilitate the subsequent welding of the first deck panel 18, during the panel assembly stage, a steel gasket 20 is welded to the location where the first deck panel 18 is installed on the triangular elbow plate 9, such as... Figure 6As shown, the width of the steel pad is greater than the thickness of the triangular elbow plate 9, so that the steel pad 20 extends outwards on both sides relative to the thickness of the triangular elbow plate 9. When installing the first deck panel 18, it is laid out piece by piece along the length direction of the triangular compartment group. The edge of the first deck panel 18 is placed near the center of the steel pad and the first deck panel 18 is welded to the steel pad 20. Similarly, the edge of the next first deck panel 18 is welded to the same steel pad 20. Finally, the gap between the two first deck panels 18 is welded to fill the gap.

[0065] The entire structure is hoisted and mounted on top of the lower deck 4 to form a section of the trough;

[0066] Step 5: Segment the tank along its length to form a complete tank segment.

[0067] This embodiment also provides a segmented tank structure, such as... Figure 1 and Figure 5 As shown, it can be one or several sections, or it can be a complete length of tank segment. It can be constructed according to the above method, including V-shaped tank assembly, upper deck 1, triangular compartment assembly, U-shaped tank longitudinal wall 2, supporting longitudinal wall 3, and lower deck 4. The upper deck 1 is located above the lower deck 4. The U-shaped tank longitudinal wall 2 is vertically supported between the upper deck 1 and the lower deck 4. The V-shaped tank assembly is located above the upper deck 4 and between the two sides of the U-shaped tank longitudinal wall 2. The supporting longitudinal wall 3 is supported between the lower middle part of the V-shaped tank assembly and the upper part of the lower deck 4. The triangular compartment assembly is located inside the V-shaped tank assembly and is located near the upper two sides of the V-shaped tank assembly. More specifically, the triangular compartment assembly includes a triangular compartment deck panel 7, a triangular compartment longitudinal bulkhead 8, and a triangular elbow plate 9. One side of the triangular compartment deck panel 7 is connected to the upper deck 1. The triangular compartment longitudinal bulkhead 8 is vertically fixed to the lower end face near the other side of the triangular compartment deck panel 7. The edge of the triangular compartment longitudinal bulkhead 8 extends outward relative to the triangular compartment longitudinal bulkhead 8. The triangular elbow plate 9 is perpendicular to the triangular compartment deck panel 7 and the triangular compartment longitudinal bulkhead 8 and is located between the triangular compartment deck panel 7 and the triangular compartment longitudinal bulkhead 8.

[0068] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for constructing a tank in segments, characterized in that, The tank section includes a V-shaped tank assembly, an upper deck, a triangular compartment assembly, a U-shaped longitudinal wall, supporting longitudinal walls, and a lower deck. The upper deck is positioned above the lower deck. The U-shaped longitudinal walls are vertically supported between the upper and lower decks. The V-shaped tank assembly is positioned above the upper deck and between the U-shaped longitudinal walls on both sides. The supporting longitudinal walls are supported between the lower middle part of the V-shaped tank assembly and the upper part of the lower deck. The triangular compartment assembly is positioned inside the V-shaped tank assembly and near the upper edges of the V-shaped tank assembly. The triangular compartment assembly includes a triangular compartment deck panel, a triangular compartment longitudinal wall panel, and a triangular elbow plate. One side of the triangular compartment deck panel supports the upper deck. The triangular compartment longitudinal wall panel is vertically fixed to the lower end face near the other side of the triangular compartment deck panel. The triangular elbow plate is perpendicular to the triangular compartment deck panel and the triangular compartment longitudinal wall panel and is located between the triangular compartment deck panel and the triangular compartment longitudinal wall panel. The method includes: Step 1: Divide the tank into several sections. Each section includes the erection of the V-shaped tank assembly, the upper deck, the triangular compartment assembly, the U-shaped tank longitudinal wall, the supporting longitudinal wall, and the lower deck. The same components of different tank sections are assembled on the same jig. Step 2: The V-shaped trough sub-assembly and the upper deck are fabricated in reverse on the same jig; the triangular compartment sub-assembly, the U-shaped trough longitudinal bulkhead, the supporting longitudinal bulkhead, and the lower deck are fabricated on jigs separately. Step 3: Install the U-shaped longitudinal wall panels above the upper deck in the reverse state, and assemble them in the trough segment above the V-shaped sub-assembly in the reverse state, where the supporting longitudinal walls are installed. Step 4: Assemble the normally mounted triangular compartment into the V-shaped channel; hoist the entire assembly onto the lower deck to form a section of the channel. Step 5: Segment the tank along its length to form a complete tank segment.

2. The method for constructing a segmented tank according to claim 1, characterized in that, In step 2, the V-groove sub-assembly and the upper deck assembly on the linear jig frame include the following steps: S21. Fabrication of linear jig frame: The linear jig frame includes jig frame columns and linear jig plates, with the jig frame columns supported below the linear jig plates; the center line of the linear jig frame is marked on the ground. S22, the V-shaped trough assembly includes a trough bottom plate and trough inclined plates set on both sides of the trough bottom plate, with an obtuse angle between the trough inclined plates and the trough bottom plate; The bottom plate of the tank is positioned on the linear jig with the center line of the jig as a reference. The center line of the bottom plate of the tank is aligned vertically with the center line of the jig, and the bottom plate of the tank is spot-welded to the jig. S23. Lay the inclined plates of the tank body on the linear jigs on both sides along the bottom plate of the tank body. The inclined plates of the tank body are positioned with the bottom plate of the tank body as the reference. The inclined plates of the tank body are spot welded to the jig brackets. S24. The upper deck is assembled on the linear jig along the inclined plate of the trough, and the upper deck is spot-welded to the jig. S25. After the panels are assembled, the joints are welded.

3. The method for constructing a segmented tank according to claim 2, characterized in that, In step 2, the V-groove group assembly is constructed by selecting three linear jigs with transverse reinforcements at the beginning, middle and end. After the segmented assembly is completed, the linear jigs and transverse reinforcements are cut off together with the segmented assembly for hoisting and turning.

4. The method for constructing a segmented tank according to claim 3, characterized in that, In step 2, the triangular cabin assembly includes a triangular cabin deck panel, a triangular cabin longitudinal bulkhead, and a triangular elbow plate. The jig used for assembling the triangular cabin assembly includes a column-type jig and a slot-type jig. The slot-type jig has a slot facing upward that matches the thickness of the triangular cabin deck panel. The slot-type jig is located on one side of the column-type jig, and the bottom of the slot is lower than the upper support surface of the column-type jig.

5. The method for constructing a segmented tank according to claim 4, characterized in that, When assembling the triangular cabin group on the jig, the longitudinal bulkhead panels of the triangular cabin are placed horizontally on the upper support surface of the column-type jig. The longitudinal bulkhead panels of the triangular cabin are spot-welded to the column-type jig. The triangular cabin deck panels are divided into a first deck panel and a second deck panel. Then, the second deck panel is inserted longitudinally into the slot of the slot-type jig. The end of the second deck panel is adjusted to be flush with the end of the longitudinal bulkhead panel of the triangular cabin, so that the side of the longitudinal bulkhead panel of the triangular cabin that is close to the slot-type jig is perpendicular to the second deck panel. The longitudinal bulkhead panel of the triangular cabin and the second deck panel are spot-welded to fix them. The first deck panel is not installed yet. It is installed after the triangular cabin group is assembled in the V-groove. Then, the installation lines of the triangular elbow plates are drawn on the longitudinal bulkhead panels of the triangular cabin, and the triangular elbow plates are installed one by one.

6. The method for constructing a tank in segments according to claim 5, characterized in that, When assembling the triangular cabin group into the V-shaped groove, weld and fix the longitudinal wall plate and triangular elbow plate of the triangular cabin to the inclined plate of the groove respectively. Then install the first deck panel and weld and fix the two sides of the first deck panel to the upper deck and the second deck panel respectively.

7. The method for constructing a segmented tank according to claim 1, characterized in that, After the V-shaped channel assembly, upper deck, triangular compartment assembly, U-shaped channel longitudinal wall, support longitudinal wall, and lower deck panel fabrication and welding are completed, the frame is marked and installed. When marking the frame, a welding shrinkage value of 0.3-0.8mm is added in advance. At the intersection of the frame and panel weld, the weld is first ground flat, and the frame is positioned along the frame marking. After positioning, it is fixed by spot welding. When welding completely, the frames are welded by intermittent welding.

8. The method for constructing a segmented tank according to claim 5, characterized in that, The triangular cabin assembly is assembled using a double-sided welding method during the complete welding process. After one side is welded, it is flipped over for carbon gouging before welding the other side. After the double-sided welding is completed, 100% UT flaw detection is performed. After the flaw detection is qualified, the straightness of the triangular cabin assembly is measured. If the straightness is qualified, channel steel is installed on the triangular elbow plate for reinforcement.

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