A non-standard multi-storage tank installation process with a stable structure

Abstract

The present invention discloses a non-standard multi-storage tank installation process with a stable structure. By adding a riser, a support pipe, a semicircular pipe and a 1 / 4 arc pipe in the storage tank, and combining triangular tooling and a scientific welding process, the structure is stabilized, the overall pressure resistance of the storage tank is increased, deformation and cracks are guaranteed not to occur, media are ensured not to mix with each other, the safety of the storage tank is guaranteed, and the service life of the storage tank is extended.

Description

Technical Field

[0001] The invention belongs to the field of storage tank manufacturing and installation, and specifically relates to a non-standard multi-storage tank installation process with a stable structure. Background Art

[0002] There are a large number of storage tanks in chemical parks now. Common storage tanks are generally single-chamber storage tanks. When storing two or more materials, multiple storage tanks are required, supplemented by related pipelines for piping connection, which will lead to high engineering manufacturing costs and occupy a large site area.

[0003] In order to solve this problem, non-standard storage tanks were invented, which use the partition plates inside the tank to divide the tank into 2, 3 or 4 independent chambers to achieve the purpose of storing different media separately. As the number of chambers in the tank increases, the installation process will become more complicated, the quality requirements will be higher, the process will be more complicated, and the construction difficulty will increase. In the actual installation process, there are several defects:

[0004] 1. Non-standard storage tanks generally use the type of compartment plates. The connection between the compartment plates and the cylinder is a sharp-angle fillet weld. The reinforcement plate and the cylinder are also directly welded with fillet welds. The thickness of the cylinder plate of the storage tank is relatively thin, and the cylinder is prone to large welding deformation, especially for large storage tanks;

[0005] 2. Since the bulkhead plates are not installed as a whole and need to be spliced, the weight of the bulkhead plates of non-standard tanks continues to increase as the number of compartments increases. When the weight increases, the pulling will cause a large deformation;

[0006] 3. Although it has been corrected, the cylinder will also produce a large deformation during the single-chamber water pressure test. It can be foreseen that in the later production and use process, each chamber may be used as a single chamber, directly bearing high pressure, uneven force on the weld, and the weld is easy to tear and crack, causing the media on both sides to mix, affecting the use function of the storage tank, affecting production, and posing the risk of environmental pollution.

[0007] 4. If there are spot welding or welds at some places, it will cause leakage. In addition, during the water pressure test, if water enters the middle support tube, it may not be visible in the short term, but after it is filled with materials, water will slowly seep out and affect the quality of the materials.

[0008] 5. Due to the large size and heavy weight of the storage tank, unscientific welding process will also cause serious deformation;

[0009] 6. Since the partition plates inside the tank divide the storage tank into multiple independent cavities, it is necessary to open a door under each cavity during the installation and welding of the storage tank to facilitate the entry and exit of materials, and finally the door must be welded shut. However, due to the large size and heavy weight of large storage tanks, the more partitions there are, the more doors there are; when welding the doors later, the more wall panels are welded, the easier it is to cause deformation of the lower half of the cylinder, and even cause the edge of the bottom plate to warp; even if the anchor bolts are installed, they cannot be held down, which seriously affects the quality of the storage tank. Summary of the invention

[0010] In order to solve the above problems, the present invention discloses a non-standard multi-storage tank installation process with a stable structure. By adding risers, support pipes, semicircular pipes and 1 / 4 arc pipes in the storage tank, combined with triangular tooling and scientific processes, the structure is stabilized, the overall pressure resistance of the storage tank is increased, and deformation and cracks will not occur, thereby ensuring the safety of the storage tank and extending its service life.

[0011] To achieve the above object, the technical solution of the present invention is as follows:

[0012] A non-standard multi-storage tank installation process with a stable structure includes the following steps:

[0013] (1) Prepare the circular bottom plate, top cover, partition plate, multi-layer wall plate and other accessories;

[0014] (2) Install the tank body using the inverted installation method: first weld the bottom plate, then lift the top cover into place and weld it in place, then gradually weld multiple layers of wall panels downward until the bottom wall panel is aligned with the bottom plate and corner welded; finally install the accessories;

[0015] (3) The bottom wall panel has a door, and the number of the doors is the same as the internal cavity of the tank body; a right-angle triangle fixture is installed inside the door position, with one right-angle side of the right-angle triangle fixture connected to the bottom plate, and the other right-angle side vertically connected to the wall panel above the door.

[0016] (4) Add at least five risers inside the reservoir, arranged in a square grid, the risers being arranged vertically and extending upward from the bottom plate to the top cover;

[0017] (5) Vertical semicircular tubes are welded to the inner wall of the wall panel. The number of semicircular tubes is the same as the number of the inner cavity of the tank body. The door opened in step (3) is set between two adjacent semicircular tubes.

[0018] (6) Install S-shaped arc partition plates from bottom to top, the partition plates evenly divide the interior of the tank into multiple cavities, one side of each arc partition plate is connected to the central vertical pipe, and the other side is welded and fixed to the wall plate through a semicircular pipe, and at least one other vertical pipe is welded in the middle of each arc partition plate;

[0019] (7) Multiple layers of horizontal support pipes are fully welded on the side of the vertical pipe. The support pipes are arranged in a grid pattern. The outermost side of the support pipes is fixed on the inner wall of the wall panel. The contact between the support pipes and the inner side of the wall panel and the vertical pipe is fully welded;

[0020] (8) Install anchor bolts on the periphery of the base plate, weld the door, and remove the right-angle triangle tooling;

[0021] (9) Weld 1 / 4 arc-shaped pipe guard plates at the contact points between the wall plate and the bottom plate, and between the bulkhead plate and the bottom plate;

[0022] (10) Seal the can and conduct pressure test for 48 hours. The can is qualified if there is no leakage or abnormal deformation.

[0023] As an improvement of the present invention, the inner wall of the top cover, the inner wall of the tank body, the upper plane of the bottom plate, the partition plate, the vertical pipe, the support pipe, the semicircular pipe and the 1 / 4 arc pipe guard plate are treated to prevent rust.

[0024] The welding process of each component of the present invention is as follows:

[0025] a: Opening the storage tank door:

[0026] Confirm and check the tank door position on site. The door is set between two adjacent semicircular pipes. A temporary door of 3000*1800mm is set at the longitudinal weld of the last strip. After the construction of the partition plate and support pipe in the tank is completed, the door position is welded and the T-shaped weld is radiographically inspected.

[0027] b: Installation of vertical pipe in the tank:

[0028] At least five risers are added inside the partition storage tank, which are arranged in a square grid. The risers are vertically arranged and extend from the bottom plate to the top cover as support columns connecting the partition plate and the support pipe. The bottom plate welds at the location of the risers need to be welded before installation. After the bottom plate welds are welded, corresponding ultrasonic testing and vacuum testing are carried out. In order to increase the stability of the risers, reinforcement plates are added. After the inspection is qualified, the reinforcement plates are welded. During the welding process of the reinforcement plates, the reinforcement plates will form cross welds with the tank bottom plate. The cross welds are prone to stress concentration, which is very likely to cause deformation products during subsequent use. Cracks occur, and repeated welding heat input causes coarse grains in the structure, which affects the bearing capacity of the weld. Therefore, during the welding process, the base plate is subjected to ultrasonic and airtightness tests. After the test is completed, the cross position of the base plate is polished to be flush with the base plate. After the reinforcement plate is primed, a penetration test is carried out. After the test is qualified, the weld is filled, and the appearance defects are checked. The penetration test is carried out again. After the test is qualified, the column is installed; when installing the riser, the columns are placed from the top of the tank onto the reinforcement plate inside the tank in turn. After the position is determined, the verticality and horizontality are checked. After the test is qualified, welding is carried out, and welding is carried out from the center riser to the surrounding risers.

[0029] c: Installation of semicircular pipe in tank:

[0030] When installing the semicircular tube, the large angle seams and bottom plate welds at the corresponding positions need to be welded, the bottom plate is subjected to ultrasonic testing and vacuum testing, the large angle seams are subjected to penetration testing, and the semicircular tubes are welded after passing the test. The semicircular tube welding process is consistent with the riser reinforcement plate process. The semicircular tubes are placed from the top of the tank on the reinforcement plate inside the tank in turn. After the position is determined, the horizontality is tested. After passing the test, welding is performed. When welding the semicircular tubes, burrs and rust on both sides of the semicircular tubes are polished, and the semicircular tubes are polished and rust and other impurities are cleaned at the position where the semicircular tubes are welded on the tank wall. Spot welding is performed first, and overall welding is performed after spot welding is completed. When welding, cross welds will appear at the position of the semicircular tube and the tank wall transverse seam. At the cross weld position, the wall plate weld intersection position is ground 5cm to be flush with the wall plate, and a base weld is performed. After welding, penetration testing is performed. After passing the test, the weld is full, and penetration testing is performed again. On the outside of the tank wall at the intersection, radiographic testing is performed to prevent internal welding defects caused by multiple welding and stress concentration. After welding, magnetic particle testing is performed on the fillet welds.

[0031] d: Installation of support pipe inside the tank:

[0032] After the installation of the semicircular pipe and the vertical pipe is completed, the support pipe is welded. In order to prevent the vertical pipe and the tank top from being deformed by tension, the installation of the top support pipe is completed first before the installation of the partition board, and then the partition is installed; the addition of partitions to the storage tank reinforces the main structure of the storage tank. The support pipe supports the tank body in the partition to form a stable triangular structure, which strengthens the strength of the partition and the storage tank. After the installation of the second partition in the tank is completed, the remaining support pipes are installed. The installation sequence is from bottom to top. When installing the support pipe, only the corresponding size cutting is required, and the material is welded after entering the tank body. Before the support pipe is welded, the position is measured in advance. All support pipes must be kept vertical to the semicircular pipe of the column to ensure uniform force distribution. After the spot welding of the support pipe is completed, the horizontality of the support pipe is tested, and the reinforcement is welded after the test is qualified;

[0033] e. Installation of partition groups:

[0034] Prefabrication of bulkhead panels:

[0035] e 1: Prefabrication of reinforcement ribs: Cut a piece of steel plate according to the curvature of the partition plate, and use a steel plate with a width of 140mm for the other piece. When prefabricating the partition plate, the reinforcement ribs are welded into an L shape first. After all prefabrication is completed, the reinforcement ribs of the partition plate are welded. When welding L-shaped reinforcement ribs, all spot welding should be completed before overall welding;

[0036] e 2: Prefabrication of partition plates: Since the partition plates are small, thin, and require a large amount of welding for the reinforcement ribs, they must be symmetrically welded in sections, up and down, and on both sides, during assembly and welding with the reinforcement ribs. After all sections are welded, the entire plate is fully welded. Use a small current and fast welding during the welding process. To prevent stress deformation, strictly control the welding line energy during the welding process. During the welding process of the weld, the fewer the heating times and heat input, the smaller the degree of welding deformation. After the arc-shaped components such as the partition steel beams are processed and formed, they are checked with arc-shaped templates, and the gap should not be greater than 2mm. After prefabrication, they are placed on the platform for inspection, and the warping deformation should not exceed 0.1% of the component length, and should not be greater than 6mm. Carry out corresponding inspections on the curvature, size, weld appearance, and weld angle height of the partition plates.

[0037] e3: Before assembling the partition, the partition prefabrication molding inspection is passed before assembly. When assembling the partition board, first clean the rust and other impurities of 3-5cm on the edge of the partition board, clean the rust and impurities at the welding position of the column and semi-circular tube. When the partition board is assembled, the spacing between the plate and the column is required to be 2-3mm. During the welding process of the storage tank, due to the large amount of welding, stress deformation occurs, resulting in the partition board cannot be installed completely according to the established size during installation, which greatly increases the difficulty of installation. The partition can only be adjusted. For welds with too large gaps, the back is welded with a ceramic pad. After the base welding is completed, clean the impurities on the weld surface, grind the weld joint for penetration testing, and conduct post-testing after passing the test. Continue welding, after the front welding is completed, remove the back pad, and use air planing to clean the root of the back. After the root cleaning is completed, conduct penetration testing again. After the test is qualified, complete the subsequent welding; the welds with gaps within the qualified range are completed by front welding, and the back is cleaned by welding; the partition plate is installed from bottom to top. During the welding process, the longitudinal fillet welds need to be fully welded, and the transverse butt welds only need to be section welded. After all the partition plates are assembled, the transverse butt welds are finally welded. After the welding is completed, the longitudinal fillet welds and the fillet welds between the partition plate and the bottom plate are 100% tested by magnetic powder or penetration, and the transverse butt welds are 20% tested by radiography according to the length of the partition plate welds;

[0038] f: Installation of large angle seam protection pipe:

[0039] After the storage tank is fed into the storage tank, the overall center of gravity cannot always be guaranteed to be in the center of the tank body. It is necessary to add a 1 / 4 arc-shaped pipe guard plate to the inner large angle seam. Before welding the pipe guard plate, the large angle seam of the storage tank is subjected to 100% penetration testing. After passing the test, the pipe guard plate is welded and installed. After the installation is completed, the two welds of the protective pipe are subjected to 100% penetration testing. The pipe guard plate is made of DN80 carbon steel pipe cut into 1 / 4 and installed by bending. During the installation of the pipe guard plate, the two welds are close to each other and the wall thickness of the pipe is thin, which is very easy to deform during the welding process, and the welding is difficult. After many tests, spot welding is first carried out, small current multi-pass welding is carried out on both sides of the pipe guard plate, welding from the center to both ends, and segmented welding is adopted.

[0040] As an improvement of the present invention, the partition plate body is provided with reinforcing ribs

[0041] As an improvement of the present invention, the right-angle triangle tooling in step (3) is welded from three steel pipes.

[0042] As an improvement of the present invention, the right-angled triangle fixtures described in step (3) are installed in two groups on the inner side of each door, and a gap is left between the two groups of right-angled triangle fixtures to ensure that the partition plate can enter the warehouse.

[0043] As an improvement of the present invention, in step (7), multiple layers of horizontal support frames are fully welded inside the tank body, one end of the support frame is connected to the central vertical pipe, and the other end is connected to the inner wall of each layer of wall panel, and the support frame and the support pipe are staggered in position and height.

[0044] As an improvement of the present invention, the 1 / 4 arc-shaped tube guard plate in step (9) is formed by bending a round tube and then splitting it.

[0045] As an improvement of the present invention, the 1 / 4 arc tube in step (9) is welded from the middle to both ends.

[0046] As an improvement of the present invention, the step of sealing and pressure testing the can in step (10) is as follows:

[0047] Water is added to warehouse No. 1 first. When the liquid level reaches half the height, the liquid level is maintained and observed for 12 hours. If there is no abnormality, water is continued to be added until the warehouse is full. The liquid level is maintained and observed for 12 hours. After the inspection is qualified, water is added to warehouse No. 2 according to the same steps as above. After the inspection is qualified, water is slowly drained from warehouse No. 1. After warehouse No. 1 is emptied of water, warehouse No. 2 is left to stand for 12 hours. After the inspection is normal, the other warehouses are operated in the same way. After all the tests are completed, water is added to warehouse No. 1 again, and the liquid level is reached and left to stand for another 12 hours. After the inspection is qualified, water is drained from warehouse No. 1 and the last warehouse at the same time. It is qualified if there is no abnormal deformation or leakage.

[0048] The beneficial effects of the present invention are:

[0049] (1) Add a right-angle triangle tooling made of steel pipe at the door position to ensure the stability of the bottom plate when welding the partition plate and the bottom plate to prevent hollowing of the center part of the bottom plate. In addition, ensure the stability of the tank wall and bottom plate when welding the door to prevent deformation of the cylinder and warping of the edge bottom plate.

[0050] (2) The triangular tooling made of right-angle steel pipes is simple to make and easy to disassemble later, which is conducive to cleaning from the manhole after construction.

[0051] (3) The partition board adopts an S-shaped arc board. This shape can effectively increase the load-bearing area of ​​the partition board and can withstand greater pressure than a flat partition board.

[0052] (4) At least five risers were added in the center and around the tank. Although the amount of welding increased, these risers bore part of the weight of the partition plate and the pressure transmitted by the cavity during installation and use, ensuring that the partition plate would not deform.

[0053] (5) A semicircular tube is provided on the side wall of the tank body, and the outer end of the partition plate is welded to the semicircular tube, which minimizes the stretching and deformation of the tank body by the partition plate.

[0054] (6) Multiple layers of support pipes are welded on the outside of the vertical pipe. The support pipes are arranged in a grid pattern, which improves the overall compressive resistance of the storage tank when the single chamber is used to store materials, and reduces the risk of direct high pressure, uneven stress on the weld, and cracks on the weld during later production and use, which causes the media on both sides to mix, affecting the use function of the storage tank, and affecting the risk of production.

[0055] (7) The contact points between the support pipe and the inner side of the wall panel and the vertical pipe are fully welded. In this way, during the water filling pressure test, water will not accumulate inside the support pipe 5, preventing the material liquid from entering the support pipe and causing material contamination, thus eliminating hidden dangers.

[0056] (8) A 1 / 4 arc-shaped pipe guard plate is added at the contact point between the tank body side wall and the bottom plate, and between the bulkhead plate and the bottom plate, which changes the bearing pressure of the weld and enhances the corrosion resistance.

[0057] (9) Since the storage body is made of multiple layers of stacked and welded annular wall panels, in order to prevent the deformation of each layer of wall panels, a horizontal support frame is fully welded inside each layer of wall panels. One end of the support frame is connected to the central riser, and the other end is connected to the inner wall of the wall panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is the installation flow chart of the present invention.

[0059] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0060] Figure 3 It is a schematic diagram of the internal top view structure of the present invention.

[0061] Figure 4 This is a schematic diagram of the 1 / 4 arc-shaped tube guard plate described in the present invention.

[0062] Figure 5 This is a schematic diagram of the door opening support described in the present invention.

[0063] Figure 6 This is a schematic diagram of the installation of the right-angle triangle tooling described in the present invention.

[0064] Figure 7 It is a schematic diagram of the partition plate reinforcement ribs described in the present invention.

[0065] List of Figure Symbols:

[0066] 1. Top cover, 2. Wall panel, 3. Bottom plate, 4. Vertical pipe, 5. Support pipe, 6. Partition plate, 7. Semicircular pipe, 8. 1 / 4 arc pipe guard plate, 9. Support frame, 10. Door, 11. Right-angle triangle tooling, 12. Reinforcement ribs. Implementation

[0067] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0068] As shown in the figure, a non-standard multi-storage tank installation process with a stable structure described in the present invention, taking a large storage tank with four warehouses (more than 10 meters) as an example, includes the following steps:

[0069] (1) Prepare the circular bottom plate 3, the top cover 1, the partition plate 6, the multi-layer wall plate 2 and other accessories; the parts inside the tank body are all treated with rust prevention (such as sandblasting).

[0070] Prefabrication of partition boards: Since the partition boards are small, thin, and require a large amount of reinforcement welding, they need to be symmetrically welded in sections, upper and lower, and on both sides, when assembled and welded with the reinforcements. After all sections are welded, the whole is fully welded. Use a small current and fast welding during the welding process. To prevent stress deformation, strictly control the welding line energy during the welding process. During the welding process of the weld, the fewer the heating times and heat input, the smaller the degree of welding deformation. After the arc-shaped components such as the partition steel beam are processed and formed, they are checked with arc-shaped templates, and the gap should not be greater than 2mm. After prefabrication, put it on the platform for inspection. The warping deformation should not exceed 0.1% of the length of the component and should not be greater than 6mm. Carry out corresponding inspections on the curvature, size, weld appearance, and weld angle height of the partition board.

[0071] (2) Install the tank body by the inverted installation method: first weld the bottom plate 3 (the diameter of the bottom plate 3 is slightly larger than the diameter of the tank body, and the anchor bolts are installed on the exposed part). The bottom plate is arranged in a T-shaped arrangement method, and then the top cover 1 is lifted into place and welded to fix it. Then, gradually weld multiple layers of wall panels 2 downward until the bottom wall panel 2 is aligned with the bottom plate 3 and corner welded. Finally, install the accessories.

[0072] (3) The bottom wall panel has 10 door openings, the number of which is the same as the number of the internal cavity of the tank;

[0073] The main purpose of opening the door is to transport materials such as the partition board 6 into the tank for splicing. The more partitions there are, the more doors there are. When closing the door later, the more wall panels are welded, which is more likely to cause the lower half of the cylinder to deform, and even cause the edge of the bottom plate to warp. Therefore, a right-angle triangle tooling 11 made of steel pipes should be added to the position of the door, and the right-angle triangle tooling 11 should be installed inside the door position. One right-angle side of the right-angle triangle tooling is connected to the bottom plate 3, and the other right-angle side is vertically connected to the wall plate 2 above the door, which plays a supporting role. When the partition board and the bottom plate are welded during construction, the stability of the bottom plate is ensured to prevent the center part of the bottom plate from hollowing out; when the door is closed and the wall plate is welded, the stability of the tank wall plate and bottom plate is ensured to prevent the cylinder from deforming and the edge of the bottom plate from warping.

[0074] The triangular tooling 11 made of three steel pipes is simple to make and convenient to disassemble in the later stage, which is conducive to cleaning from the manhole after construction.

[0075] (4) At least five risers 4 are added inside the storage body and arranged in a square grid. The risers 4 are arranged vertically and extend upward from the bottom plate 3 to the top cover 1.

[0076] In order to increase the stability of the riser 4, a reinforcement plate is added, and a cross weld is formed between the reinforcement plate and the tank bottom plate. Since the cross weld is prone to stress concentration, it is very easy to cause deformation and cracks during subsequent use. Repeated welding heat input leads to coarse grains in the organization, affecting the bearing capacity of the weld. Therefore, the bottom plate is subjected to ultrasonic and airtightness testing during the welding process. After the testing is completed, the cross position of the bottom plate is polished to be flush with the bottom plate. After the reinforcement plate is primed, a penetration test is performed. After the test is qualified, the weld is filled, the appearance defects are checked, and another penetration test is performed. After the test is qualified, the riser 4 is installed. When installing the riser 4, the riser 4 is placed from the top of the tank onto the reinforcement plate in the tank in turn. After the position is determined, the verticality and horizontality are tested. After the test is qualified, welding is performed. When welding, welding is performed from the center column to the surrounding columns.

[0077] (5) Vertical semicircular tubes 7 are welded to the inner wall of the wall panel 2. The number of semicircular tubes is the same as the internal cavity of the tank body. The door opened in step (3) is set between two adjacent semicircular tubes.

[0078] When the semicircular tube 7 is installed, it is necessary to weld the large angle seams and bottom plate welds at the corresponding positions, carry out ultrasonic testing and vacuum testing on the bottom plate, carry out penetration testing on the large angle seams, and weld the semicircular tube 7 after passing the test. When welding the semicircular tube 7, keep the same process as the vertical tube 4 reinforcement plate when welding. Put the semicircular tube 7 from the tank top into the reinforcement plate in the tank in turn, detect the horizontality after determining the position, and weld after passing the test. When welding the semicircular tube, grind the burrs and rust on both sides of the semicircular tube, grind and remove rust and other impurities at the position of welding the semicircular tube on the tank wall, spot weld first, and weld as a whole after spot welding is completed. When welding, weld from bottom to top, and a cross weld will appear at the position of the semicircular tube and the transverse seam of the tank wall. At the cross weld position, grind the 5cm intersection position of the wall plate weld to be flush with the wall plate, and perform base welding. After welding, perform penetration testing, weld fully after passing the test, and perform penetration testing again. On the outside of the tank wall at the intersection, perform radiographic testing to prevent internal welding defects caused by multiple welding and stress concentration. After welding, perform magnetic particle testing on the fillet welds.

[0079] (6) Install S-shaped arc partition plates 6 from bottom to top. The partition plates evenly divide the interior of the tank into multiple cavities. One side of each arc partition plate 6 is connected to the central vertical pipe 4, and the other side is welded and fixed to the wall plate 2 through a semicircular pipe 7. At least one other vertical pipe is welded in the middle of each arc partition plate;

[0080] To ensure the use, the partition board 6 is optimized to an S-shaped arc partition board. This shape can effectively increase the stress area of ​​the partition board. Compared with the flat partition board, it can withstand greater pressure. The partition board body is provided with reinforcing ribs 12. The reinforcing ribs 12 are cut into a piece of steel plate according to the curvature of the partition board, and the other piece is a steel plate with a width of 140mm, which is welded into an L shape to ensure that the partition board body does not deform. Figure 7 shown.

[0081] The partition boards 6 are spliced ​​from bottom to top using a normal assembly method, and each layer of the support net is improved as the partition boards are spliced.

[0082] After the partition board 6 is formed, it is inspected and can be assembled only after it passes the inspection. When assembling the partition board, clean the rust and other impurities of 3-5cm on the edge of the partition board, clean the rust and impurities at the welding position of the column and semicircular pipe, and when the partition board is assembled, the spacing between the plate and the riser is required to be 2-3mm. During the welding process of the storage tank, due to the large amount of welding, stress deformation occurs, resulting in the partition board not being installed completely according to the established size during installation, which greatly increases the difficulty of installation. The partition board can only be adjusted. For welds with too large gaps between the groups, a ceramic pad is added to the back for welding. After the base welding is completed, impurities on the weld surface are cleaned, and the weld is polished for penetration testing. After the inspection is qualified, subsequent welding is carried out. After the front welding is completed, the back pad is removed, and the back is cleaned by air planing. After the root cleaning is completed, a penetration test is carried out again. After the inspection is qualified, the subsequent welding is completed; the welds with gaps within the qualified range are welded by front welding and the back is cleaned. The partition plates are installed from bottom to top. During the welding process, the longitudinal fillet welds need to be fully welded, and the transverse butt welds only need to be section welded. After all the partition plates are assembled, the transverse butt welds are finally welded. After welding, the longitudinal fillet welds and the fillet welds between the partition plates and the bottom plates are subjected to 100% magnetic particle or penetration testing, and the transverse butt welds are subjected to 20% radiographic testing according to the length of the partition plate welds.

[0083] (7) Multiple layers of horizontal support tubes 5 are fully welded on the side of the riser. The support tubes are arranged in a grid pattern. The outermost side of the support tubes 5 is fixed on the inner wall of the wall panel 2. The contact between the support tubes 5 and the inner side of the wall panel 2 and the riser 4 is fully welded;

[0084] In order to prevent the vertical pipe and the tank top from being deformed by tension, the installation of the top support pipe should be completed before the installation of the partition board 6, and then the partition board 6 should be installed. The addition of partitions to the storage tank reinforces the main structure of the storage tank. The support pipe 5 supports the tank body in the partition, forming a stable triangular structure, which strengthens the strength of the partition and the storage tank. After the second partition in the tank is installed, the remaining support pipes are installed. The installation sequence is from bottom to top. When installing the support pipe, only the corresponding size cutting is required, and the material is welded after entering the tank body. Before welding the support pipe, the position is measured in advance. All support pipes must be kept vertical with the semicircular pipe of the column to ensure uniform force distribution. After the spot welding of the support pipe is completed, the horizontality of the support pipe is tested, and the reinforcement is welded after the test is qualified.

[0085] At least five risers 4 are added in the center and around the tank. Although the amount of welding is increased, these risers 4 bear part of the weight of the partition plate and the pressure transmitted by the cavity during installation and use, ensuring that the partition plate 6 does not deform.

[0086] During the direct welding process between the partition plate 6 and the wall plate 2, due to the thin thickness of the tank body plate, the weight of the partition plate itself and the welding temperature, the cylinder is prone to large welding deformation, so a semicircular tube 7 is provided on the side wall of the tank body 2, and the outer end of the partition plate is welded to the semicircular tube, which shares the impact of the partition plate weight on the cylinder wall. It also reduces the pressure of the liquid inside the partition on the wall plate weld.

[0087] Since the partition boards are not installed as a whole and need not be spliced, as the weight of the partition boards increases, the partition boards may pull and deform the wall panels or tear the welds. Therefore, multiple layers of support tubes are welded on the outside of the vertical pipes. The support tubes are arranged in a grid pattern. The support tubes can not only ensure the stability of the cylinder when the material is stored in a single warehouse, but also share the impact of the weight of the partition boards on the wall panels. Ribs should be added between the support tubes to ensure the stability of the mesh support tubes.

[0088] The contact points between the support tube 5 and the inner side of the wall panel 2 and the vertical tube 4 are fully welded; thus, during the water filling pressure test, water will not accumulate inside the support tube 5, thus preventing the material liquid from entering the support tube and causing material contamination, thereby eliminating hidden dangers.

[0089] In addition, since the storage body is formed by stacking and welding multiple layers of annular wall panels, in order to prevent deformation of each layer of wall panels, a horizontal support frame 9 is fully welded inside each layer of wall panels, one end of the support frame 9 is connected to the central vertical pipe 4, and the other end is connected to the inner wall of the wall panel 2. The support frame 9 and the support pipe 5 are staggered in position and height; the function of the support frame 9 is to prevent deformation of each layer of wall panels, and the function of the support pipe 5 is to prevent deformation of the entire cylinder.

[0090] (8) Install anchor bolts on the periphery of the base plate, weld the door 10 (perform radiographic inspection on the T-shaped weld), and remove the right-angle triangle tooling 11;

[0091] (9) After the storage tank is filled, the center of gravity of the whole cannot always be guaranteed to be at the center of the tank body, and some of the stored materials may be corrosive, so it is necessary to add a protective pipe to the inner large angle seam. Therefore, the present invention welds a 1 / 4 arc pipe protective plate 8 at the contact point of the weld between the wall plate 2 and the bottom plate 3, and the partition plate 6 and the bottom plate 3 to perform protective construction, change the bearing pressure of the weld, and enhance the corrosion resistance. Before welding the 1 / 4 arc pipe protective plate 8, the large angle seam of the storage tank is subjected to 100% penetration testing. After passing the test, the protective pipe is welded and installed. After installation, the two welds of the protective pipe are subjected to 100% penetration testing. The protective pipe is cut into 1 / 4 of a DN80 carbon steel pipe and installed by bending. During the installation of the protective pipe, the two welds are close to each other and the wall thickness of the pipe is thin, so it is very easy to deform during the welding process, and the welding difficulty is relatively large. After many tests, the method of spot welding first, small current multi-pass welding on both sides of the protective pipe, welding from the center to the two ends, and segment welding is adopted.

[0092] Two options were considered before construction: one was -50 flat iron welding, and the other was 1 / 4 arc tube welding. The advantage of using -50 flat steel is that it is easy to bend and easy to construct, but it has a low pressure bearing capacity on the bottom of the tank. Larger storage tanks may cause weld tearing, which will affect the life of the tank.

[0093] The 1 / 4 arc tube is made by bending a round tube and then splitting it. Since the tube has its own arc, it has a greater pressure bearing capacity on the tank bottom, and is suitable for larger storage tanks, with less impact on the weld. The storage tanks of the present invention are all over ten meters high. When the storage tank is full, the pressure on the tank bottom weld is relatively large, so a protective plate made of 1 / 4 carbon steel arc tube is used.

[0094] Another manufacturing process of 1 / 4 arc tube guard plate 8:

[0095] If the DN80 pipe is first discarded with a pipe cutter and then the discarded 1 / 4 pipe is bent, the curvature of the 1 / 4 pipe disappears after actual operation on site and construction cannot be carried out.

[0096] Therefore, the DN80 pipe should be bent first, and then the pipe should be cut with a pipe cutter (gas cutting should not be used to prevent the material from being heated and deformed). First, take five points at both ends and the middle of the 1 / 4 arc pipe, fix it with limit blocks, and weld it symmetrically from the middle to both ends (after the pipeline is bent, wrinkles will appear on the inner side of the arc. If it is welded from one side, when it is welded to the wrinkle in the middle of the arc, the high welding temperature will cause the second half of the arc pipe to arch, resulting in unevenness on both sides after welding).

[0097] (10) Seal the can and conduct pressure test for 48 hours. The can is qualified if there is no leakage or abnormal deformation.

[0098] Water is added to Warehouse No. 1 first. When the liquid level reaches 5.5 meters, the liquid level is maintained and observed for 12 hours. If there is no abnormality, water is continued to be added. When the liquid level reaches 11 meters, the liquid level is maintained. When it reaches 11 meters, the liquid level is maintained and observed for 12 hours. After passing the inspection, water is added to Warehouse No. 2 according to the same steps as above. After passing the inspection, water can be slowly drained from Warehouse No. 1. After Warehouse No. 1 is emptied of water, Warehouse No. 2 is left to stand for 12 hours. If there is no abnormality, water is added to Warehouse No. 3 according to the same steps; after passing the inspection, water is slowly drained from Warehouse No. 2. After the water is emptied, Warehouse No. 3 is left to stand for 12 hours. If there is no abnormality, water is added to Warehouse No. 4 according to the same steps. After passing the inspection, water is slowly drained from Warehouse No. 3. After the water is emptied, Warehouse No. 4 is left to stand for 12 hours. After there is no abnormality, water is added to Warehouse No. 1 again, and the highest liquid level is reached and it is left to stand for 12 hours. After passing the inspection, water is drained from Warehouse No. 1 and Warehouse No. 4 at the same time. It is qualified if there is no deformation or leakage.

[0099] Top cover 1 strength and tightness test

[0100] Fill the tank with water to 1m below the highest design liquid level, close all openings, slowly add water to increase the pressure. When it reaches the test pressure, stop filling with water and apply soapy water on the tank top for inspection. After the test, the tank top hole should be opened immediately to connect to the atmosphere and return to normal pressure. The tank top is qualified if there is no abnormal deformation; no weld leakage is found.

[0101] Stability test of top cover 1

[0102] When the water is filled to the designed water level, all openings are closed and the test is carried out by draining water, and the pressure is slowly reduced. When the test negative pressure is reached, the tank top is observed. After the test, the holes should be opened immediately to connect to the atmosphere and return to normal pressure. The tank top is qualified if there is no abnormal deformation.

[0103] The right-angle triangle tooling 11 of the present invention has two sets installed on the inner side of each door, such as Figure 5 As shown, a gap is left between the two sets of right-angle triangle tooling to ensure that the partition plate can enter the warehouse.

[0104] It should be noted that the above content only illustrates the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. A non-standard multi-storage tank installation process with a stable structure, characterized by: The following steps are involved: (1) Prepare the circular bottom plate, top cover, partition board, multi-layer wall board and other auxiliary materials; (2) Use the inverted installation method to install the tank body: first weld the bottom plate, then lift the top cover into place and weld it, then gradually weld multiple layers of wall panels downward until the bottom wall panel is aligned with the bottom plate and corner welded; finally install the angle steel, ladder, platform and other structures; (3) The bottom wall panel has a door, and the number of the doors is the same as the internal cavity of the tank body; a right-angle triangle fixture is installed inside the door position, with one right-angle side of the right-angle triangle fixture connected to the bottom plate, and the other right-angle side vertically connected to the wall panel above the door. (4) Add at least five risers inside the reservoir, arranged in a square grid, the risers being arranged vertically and extending upward from the bottom plate to the top cover; (5) Vertical semicircular tubes are welded to the inner wall of the wall panel. The number of semicircular tubes is the same as the number of the inner cavity of the tank body. The door opened in step (3) is set between two adjacent semicircular tubes. (6) Install S-shaped arc partition plates from bottom to top, the partition plates evenly divide the interior of the tank into multiple cavities, one side of each arc partition plate is connected to the central vertical pipe, and the other side is welded and fixed to the wall plate through a semicircular pipe, and at least one other vertical pipe is welded in the middle of each arc partition plate; (7) Multiple layers of horizontal support pipes are fully welded on the side of the vertical pipe. The support pipes are arranged in a grid pattern. The outermost side of the support pipes is fixed on the inner wall of the wall panel. The contact between the support pipes and the inner side of the wall panel and the vertical pipe is fully welded; (8) Install anchor bolts on the periphery of the base plate and weld the door; (9) Weld 1 / 4 arc-shaped pipe guard plates at the contact points between the wall plate and the bottom plate, and between the bulkhead plate and the bottom plate; (10) Sealing the can and testing the pressure for 48 hours. If there is no leakage or abnormal deformation, it is qualified; The welding process is as follows: a: Opening the storage tank door: Confirm and check the tank door position on site. The door is set between two adjacent semicircular pipes. A temporary door of 3000*1800mm is set at the longitudinal weld of the last strip. After the construction of the partition plate and support pipe in the tank is completed, the door position is welded and the T-shaped weld is radiographically inspected. b: Installation of vertical pipe in the tank: At least five risers are added inside the partition storage tank, which are arranged in a square grid. The risers are vertically arranged and extend from the bottom plate to the top cover as support columns connecting the partition plate and the support pipe. The bottom plate welds at the location of the risers need to be welded before installation. After the bottom plate welds are welded, corresponding ultrasonic testing and vacuum testing are carried out. In order to increase the stability of the risers, reinforcement plates are added. After the inspection is qualified, the reinforcement plates are welded. During the welding process of the reinforcement plates, the reinforcement plates will form cross welds with the tank bottom plate. The cross welds are prone to stress concentration, which is very likely to cause deformation products during subsequent use. Cracks occur, and repeated welding heat input causes coarse grains in the structure, which affects the bearing capacity of the weld. Therefore, during the welding process, the base plate is subjected to ultrasonic and airtightness tests. After the test is completed, the cross position of the base plate is ground to be flush with the base plate. After the reinforcement plate is primed, a penetration test is performed. After the test is qualified, the weld is filled, the appearance defects are checked, and another penetration test is performed. After the test is qualified, the column is installed; when installing the riser, the column is placed from the top of the tank to the reinforcement plate inside the tank in turn, and the verticality and horizontality are tested after the position is determined. After the test is qualified, welding is performed, and welding is performed from the center riser to the surrounding risers; c: Installation of semicircular pipe in tank: When installing the semicircular tube, the large angle seams and bottom plate welds at the corresponding positions need to be welded, the bottom plate is subjected to ultrasonic testing and vacuum testing, the large angle seams are subjected to penetration testing, and the semicircular tubes are welded after passing the test. The semicircular tube welding process is consistent with the riser reinforcement plate process. The semicircular tubes are placed from the top of the tank on the reinforcement plate inside the tank in turn. After the position is determined, the horizontality is tested. After passing the test, welding is performed. When welding the semicircular tubes, burrs and rust on both sides of the semicircular tubes are polished, and the semicircular tubes are polished and rust and other impurities are cleaned at the position where the semicircular tubes are welded on the tank wall. Spot welding is performed first, and overall welding is performed after spot welding is completed. When welding, cross welds will appear at the position of the semicircular tube and the tank wall transverse seam. At the cross weld position, the wall plate weld intersection position is ground 5cm to be flush with the wall plate, and a base weld is performed. After welding, penetration testing is performed. After passing the test, the weld is full, and penetration testing is performed again. On the outside of the tank wall at the intersection, radiographic testing is performed to prevent internal welding defects caused by multiple welding and stress concentration. After welding, magnetic particle testing is performed on the fillet welds. d: Installation of support pipe inside the tank: After the installation of the semicircular pipe and the vertical pipe is completed, the support pipe is welded. In order to prevent the vertical pipe and the tank top from being deformed by tension, the installation of the top support pipe is completed first before the installation of the partition board, and then the partition is installed; the addition of partitions to the storage tank reinforces the main structure of the storage tank. The support pipe supports the tank body in the partition to form a stable triangular structure, which strengthens the strength of the partition and the storage tank. After the installation of the second partition in the tank is completed, the remaining support pipes are installed. The installation sequence is from bottom to top. When installing the support pipe, only the corresponding size cutting is required, and the material is welded after entering the tank body. Before the support pipe is welded, the position is measured in advance. All support pipes must be kept vertical to the semicircular pipe of the column to ensure uniform force distribution. After the spot welding of the support pipe is completed, the horizontality of the support pipe is tested, and the reinforcement is welded after the test is qualified; e. Installation of partition groups: Prefabrication of bulkhead panels: e 1: Prefabrication of reinforcement ribs: Cut a piece of steel plate according to the curvature of the partition plate, and use a steel plate with a width of 140mm for the other piece. When prefabricating the partition plate, the reinforcement ribs are welded into an L shape first. After all prefabrication is completed, the reinforcement ribs of the partition plate are welded. When welding L-shaped reinforcement ribs, all spot welding should be completed before overall welding; e 2: Prefabrication of partition board: As the partition board is small, thin and requires a large amount of reinforcement welding, it is necessary to weld symmetrically in sections up and down and on both sides when assembling and welding with the reinforcement. After all sections are welded, the whole is fully welded; use small current and fast welding during welding; prevent stress deformation, strictly control welding line energy during welding, and the less heating times and heat input during welding, the smaller the degree of welding deformation. After arc-shaped components such as partition steel beams are processed and formed, they are checked with arc-shaped templates, and the gap should not be greater than 2mm; after prefabrication, they are placed on the platform for inspection, and the warping deformation should not exceed 0.1% of the component length and should not be greater than 6mm; the arc, size, weld appearance and weld angle height of the partition board are tested accordingly; e3: Before assembling the partition, the partition prefabrication molding inspection is passed before assembly. When assembling the partition board, first clean the rust and other impurities of 3-5cm on the edge of the partition board, clean the rust and impurities at the welding position of the column and semi-circular tube. When the partition board is assembled, the spacing between the plate and the column is required to be 2-3mm. During the welding process of the storage tank, due to the large amount of welding, stress deformation occurs, resulting in the partition board cannot be installed completely according to the established size during installation, which greatly increases the difficulty of installation. The partition can only be adjusted. For welds with too large gaps, the back is welded with a ceramic pad. After the base welding is completed, clean the impurities on the weld surface, grind the weld joint for penetration testing, and conduct post-testing after passing the test. Continue welding, after the front welding is completed, remove the back pad, and use air planing to clean the back. After the cleaning is completed, conduct penetration testing again. After the test is qualified, complete the subsequent welding; the welds with gaps within the qualified range are completed by front welding, and the back is cleaned by welding; the partition plate is installed from bottom to top. During the welding process, the longitudinal fillet welds need to be fully welded, and the transverse butt welds only need to be section welded. After all the partition plates are assembled, the transverse butt welds are finally welded. After the welding is completed, the longitudinal fillet welds and the fillet welds between the partition plate and the bottom plate are 100% tested by magnetic powder or penetration, and the transverse butt welds are 20% tested by radiography according to the length of the partition plate welds; f: Installation of large angle seam protection pipe: After the storage tank is fed into the storage tank, the overall center of gravity cannot always be guaranteed to be in the center of the tank body. It is necessary to add a 1 / 4 arc-shaped pipe guard plate to the inner large angle seam. Before welding the pipe guard plate, the large angle seam of the storage tank is subjected to 100% penetration testing. After passing the test, the pipe guard plate is welded and installed. After the installation is completed, the two welds of the protective pipe are subjected to 100% penetration testing. The pipe guard plate is made of DN80 carbon steel pipe cut into 1 / 4 and installed by bending. During the installation of the pipe guard plate, the two welds are close to each other and the wall thickness of the pipe is thin, which is very easy to deform during the welding process, and the welding is difficult. After many tests, spot welding is first carried out, small current multi-pass welding is carried out on both sides of the pipe guard plate, welding from the center to both ends, and segmented welding is adopted.

2. A non-standard multi-storage tank installation process with a stable structure according to claim 1, characterized in that: The inner wall of the top cover, the inner wall of the tank body, the upper plane of the bottom plate, the partition plate, the vertical pipe, the support pipe, the semicircular pipe and the 1 / 4 arc pipe guard plate are subjected to rust prevention treatment.

3. According to claim 1, a non-standard multi-storage tank installation process with a stable structure is characterized by: The partition plate body is provided with reinforcing ribs.

4. The non-standard multi-storage tank installation process with a stable structure according to claim 1 is characterized by: The right-angle triangle tooling in step (3) is welded from three steel pipes.

5. The non-standard multi-storage tank installation process with a stable structure according to claim 1 is characterized by: The right-angled triangle fixtures described in step (3) are installed in two sets on the inner side of each door, with a gap left between the two sets to ensure that the partition plate can enter the warehouse.

6. The non-standard multi-storage tank installation process with a stable structure according to claim 1 is characterized by: In step (7), multiple layers of horizontal support frames are fully welded inside the tank body, one end of the support frame is connected to the central vertical pipe, and the other end is connected to the inner wall of each layer of wall panel, and the support frame and the support pipe are staggered in position and height.

7. The non-standard multi-storage tank installation process with a stable structure according to claim 1 is characterized by: The 1 / 4 arc-shaped tube guard plate in step (9) is formed by bending a round tube and then splitting it.

8. The non-standard multi-storage tank installation process with a stable structure according to claim 1 is characterized by: In step (9), the 1 / 4 arc tube is welded from the middle to both ends.

9. The non-standard multi-storage tank installation process with a stable structure according to claim 1 is characterized by: The steps of sealing and pressure testing in step (10) are as follows: Water is added to warehouse No. 1 first. When the liquid level reaches half the height, the liquid level is maintained and observed for 12 hours. If there is no abnormality, water is continued to be added until the warehouse is full. The liquid level is maintained and observed for 12 hours. After the inspection is qualified, water is added to warehouse No. 2 according to the same steps as above. After the inspection is qualified, water is slowly drained from warehouse No.

1. After the water in warehouse No. 1 is emptied, warehouse No. 2 is left to stand for 12 hours. After the inspection is normal, the other warehouses are operated in the same way. After all the tests are completed, water is added to warehouse No. 1 again, and the liquid level is reached and left to stand for 12 hours. After the inspection is qualified, water is drained from warehouse No. 1 and the last warehouse at the same time. It is qualified if there is no abnormal deformation or leakage.

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