Large dome oil tank installation and internal anti-corrosion construction technology

Abstract

The invention relates to a large dome oil tank installation and internal anti-corrosion construction technology, which adopts a processing plant to perform prefabrication, rust removal and anti-corrosion on a tank body steel plate, can reduce the workload of field rust removal and anti-corrosion after the tank body is completed, and is favorable for improving the construction quality and the working efficiency. And a steel plate film coating technology is adopted, so that the problem of comprehensive reworking caused by rust returning in rainy and snowy weather after corrosion prevention of the steel plate can be avoided. Meanwhile, the tower crane is arranged in the center of the tank body to serve as installation equipment, the tower crane can be applied to the civil construction stage and can also serve as a tool for vertical transportation and horizontal transportation of steel oil tank installation, damage caused by steel plate dragging is avoided, the working efficiency is greatly improved, and the construction cost is reduced. And finally, the wall-attached robot rust removal and corrosion prevention technology is adopted, rust removal and corrosion prevention are conducted on the weld joint part after water testing is completed, it can be avoided that an operation platform is erected on the tank body, the working efficiency is greatly improved, and the construction period is shortened.

Description

Technical Field

[0001] The invention relates to an oil tank construction technology, in particular to a large-scale dome oil tank installation and internal anti-corrosion construction technology. Background Art

[0002] In the renovation construction of large-scale earth-covered oil tank projects, water filling test and positive and negative pressure leak detection must be carried out after the installation of the oil tank is completed. Only after passing the test can the inner dome, inner wall and inner tank bottom welds be confirmed to have no leakage before anti-corrosion can be carried out. Due to the large internal space of the oil tank, the large anti-corrosion area, the large workload and the high quality requirements, the time and cost of setting up a full-floor scaffolding is long, and the cost is high. The use of a lifting platform or hanging basket for construction is difficult to control the quality of the dome construction due to the high distance from the top, and the safety risk is high. If a lift is used for construction, the lift cannot enter due to the small manhole area.

[0003] Therefore, there is an urgent need for a novel construction method that can achieve high-speed and low-cost construction while ensuring safety and quality. Summary of the invention

[0004] The purpose of the present invention is to provide a large dome oil tank installation and internal anti-corrosion construction technology to solve the problems of high safety risks, difficulty in ensuring quality and low construction efficiency in the existing large dome oil tank installation and internal anti-corrosion construction.

[0005] The present invention is achieved in this way: a large dome oil tank installation and internal anti-corrosion construction technology includes the following steps.

[0006] a. Dig a covered oil tank foundation pit and construct the oil tank foundation at the bottom of the pit.

[0007] b. Install a tower crane at the center of the oil tank foundation. The tower crane serves as equipment for vertical and horizontal transportation.

[0008] c. The tank bottom, tank top and tank wall steel plates are prefabricated in the processing plant. After the prefabricated steel plates are formed, they are first sandblasted to remove rust, and then the areas except a certain range above and below the weld are treated with anti-corrosion.

[0009] d. Use tower crane to construct the side wall of the concrete tank chamber of the earth-covered oil tank.

[0010] e. Use a tower crane to transport the prefabricated steel plate of the tank bottom to the tank room for tank bottom construction.

[0011] f. Use a tower crane to transport the prefabricated steel plates for the tank body top ring wall and the tank top prefabricated steel plates to the tank room for tank body and tank top construction. First, the top ring wall plate construction is carried out. After the top ring wall plate construction is completed, the tank top installation construction is carried out on the top ring wall plate.

[0012] g. Use a tower crane to transport the prefabricated steel plates from the second circle on the tank body to the bottom circle wall panel to the tank room for construction, and use the inverted chain inverted installation method to construct the tank body.

[0013] h. Perform non-destructive testing on welds.

[0014] i. Use the standard section of the tower crane as a fixing part to set up the tank room vault formwork platform, support the formwork on the tank room vault formwork platform, and carry out the tank room vault concrete pouring construction.

[0015] j. After the concrete of the tank chamber vault is completed and maintained to reach the designed strength, the formwork is removed and the tower crane is removed at the same time; asphalt sand is laid on the missing part of the tank bottom and the missing steel plate of the tank bottom is assembled.

[0016] k. Conduct water filling test.

[0017] l. Use a wall-climbing robot to perform rust removal and anti-corrosion work on the welds after completing the water filling test.

[0018] The tank bottom, tank top and tank wall steel plates are laid out, and the materials are cut and manufactured in the processing plant according to the layout drawings. The parts of the tank bottom, tank top and tank wall steel plates outside the 200mm range of the edge are painted for corrosion protection.

[0019] After the anti-corrosion treatment of the tank bottom, tank top and tank wall steel plates is completed, the steel plates are coated with a layer of plastic film adhered to the surface of the steel plates. Before the welding construction of the tank bottom, tank top and tank wall is carried out, the plastic film on the surface of the steel plates is removed.

[0020] In step f, 30 inverted columns are evenly distributed on concentric circles about 500 mm away from the tank wall inside the storage tank, a top plate and a lifting lug are set at the upper end of the inverted column, and the fall chain is fixed to the inverted column through the lifting lug; the lower end of each circle of wall panels is reinforced with a back bar, the back bar and the wall panel are fixed together with a gantry clamp, the lifting lug is welded on the back bar, and the lifting lug is lifted with a fall chain; when the tank top is installed, a window for the inverted column is reserved, and when the tank top is lifted to the top of the inverted column, the missing steel plate of the inverted column window is spliced.

[0021] In step i, a corbel is arranged on the inner side of the top of the tank chamber side wall, an outer ring beam is arranged along the inner side of the tank chamber side wall, an inner ring beam is arranged around the standard section of the tower crane, the inner ring beam is connected to the standard section of the tower crane through a fall chain, an arc-shaped radial beam is set between the outer ring beam and the inner ring beam, and a secondary ring beam is arranged on the radial beam, and the outer ring beam, the inner ring beam, the radial beam and the secondary ring beam constitute a tank chamber arch template platform.

[0022] In step j, the tower crane operating room and tower crane arm are first dismantled, then the tower crane standard section is dismantled, and finally the tank room arch formwork platform is disassembled and dismantled.

[0023] The present invention uses a processing plant to prefabricate, remove rust and prevent corrosion on the steel plate of the tank body, which can reduce the workload of on-site rust removal and anti-corrosion after the tank body is completed, which is beneficial to improving construction quality and work efficiency. The steel plate coating technology is also used to avoid the phenomenon of steel plate rusting after anti-corrosion in rainy and snowy weather, which in turn causes the problem of comprehensive rework. At the same time, a tower crane is set at the center of the tank body as an installation device, which can be used in the civil construction stage and can also be used as a tool for vertical and horizontal transportation of steel oil tanks, avoiding damage caused by dragging of steel plates, greatly improving work efficiency and reducing construction costs. Finally, the wall-attached robot rust removal and anti-corrosion technology is used to remove rust and prevent corrosion on the weld after the water test is completed, which can avoid the need to set up an operating platform on the tank body, greatly improving work efficiency and shortening construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the pipe wall and tank top construction of the present invention.

[0025] Figure 2 yes Figure 1 A partial enlarged view of .

[0026] Figure 3 It is a schematic diagram of the prefabricated anti-corrosion of the tank steel plate of the present invention.

[0027] In the figure: 1. Side wall of tank room; 2. Oil tank foundation; 3. Tower crane; 4. Top ring wall plate; 5. Tank top; 6. Inverted column; 7. Top plate; 8. Back bar; 9. Pretreatment area; 10. Inverted column window. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] like Figures 1 to 3 As shown, the large dome oil tank installation and internal anti-corrosion construction technology of the present invention includes the following steps.

[0031] a. Dig the oil tank foundation pit and construct the oil tank foundation 2 at the bottom of the foundation pit.

[0032] b. Install a tower crane 3 at the center of the oil tank foundation 2. The tower crane 3 serves as a vertical and horizontal transportation device.

[0033] c. While the foundation pit construction, oil tank foundation 2 construction and tower crane 3 installation construction are being carried out, a temporary processing plant is built on the open space of the construction site, and the tank bottom, tank top 5 and tank wall steel plates are prefabricated in the processing plant. After the prefabricated steel plates are formed, they are first sandblasted for rust removal, and then the areas except for a certain range above and below the weld are subjected to anti-corrosion treatment.

[0034] d. Use the tower crane 3 to construct the concrete tank chamber side wall 1 of the earth-covered oil tank.

[0035] e. Use tower crane 3 to transport the prefabricated steel plate of the tank bottom to the tank room for tank bottom construction.

[0036] f. Use the tower crane 3 to transport the prefabricated steel plates of the tank top wall panel 4 and the tank roof 5 to the tank room for the construction of the tank body and the tank roof 5. First, the top wall panel 4 is constructed. After the construction of the top wall panel 4 is completed, the tank roof 5 is installed on the top wall panel 4.

[0037] g. Use tower crane 3 to transport the prefabricated steel plates from the second circle on the tank body to the bottom circle wall panel to the tank room for construction. Use the inverted chain inverted installation method to construct the tank body.

[0038] h. Perform non-destructive testing on welds.

[0039] i. Use the 3rd standard section of the tower crane as a fixed part to set up the tank room vault formwork platform, support the formwork on the tank room vault formwork platform, and carry out the tank room vault concrete pouring construction.

[0040] j. After the concrete of the tank chamber vault is completed and maintained to reach the designed strength, the formwork is removed and the tower crane 3 is removed at the same time; asphalt sand is laid on the missing part of the tank bottom and the missing steel plate of the tank bottom is assembled.

[0041] k. Conduct water filling test.

[0042] l. Use a wall-climbing robot to perform rust removal and anti-corrosion work on the welds after completing the water filling test.

[0043] During the prefabrication of the tank body steel plate, the tank bottom, tank top 5 and tank wall steel plates are first laid out, and then cut and manufactured in the processing plant according to the layout drawing. After the steel plate is cut, the experimental rolling machine rolls the tank wall steel plate.

[0044] like Figure 3As shown, the tank bottom, tank top 5 and the pre-treated area 9 outside the 200mm range of the tank wall steel plate edge are subjected to paint anti-corrosion pre-treatment operations.

[0045] After the anti-corrosion treatment of the tank bottom, tank top 5, and tank wall steel plates is completed, the steel plates are coated with a layer of plastic film on the surface of the steel plates. The processed tank wall steel plates are stored on a jig with the same arc as the tank wall steel plates. The same type of jig is also set for the transport of the formed tank wall steel plates to prevent deformation. The single tank top 5 steel plate is formed on the jig for welding the reinforcement ribs and the tank top 5 steel plate. After forming, it is checked with an arc sample. Before welding the tank bottom, tank top 5, and tank wall, remove the plastic film on the steel plate surface.

[0046] In step f, 30 inverted columns 6 are evenly distributed on concentric circles about 500 mm away from the tank wall inside the storage tank, a top plate 7 and a lifting lug are set at the upper end of the inverted columns 6, and the fall chain is fixed to the inverted columns 6 through the lifting lug.

[0047] During the installation of the tank roof 5 , an inverted column window 10 is reserved. When the tank roof 5 is lifted above the inverted column 6 , the missing steel plate of the inverted column window 10 is spliced.

[0048] In step g, the lower end of the wall panel is reinforced with a back bar 8, the back bar 8 is fixed to the wall panel with a gantry fixture, and the lifting lugs are welded on the back bar 8. The second circle of wall panels on the outside of the top circle wall panel 4 is enclosed, the longitudinal seams are spot welded, and the enclosed seal is tightened with two hand-pulled fall chains, and then the longitudinal seams between the wall panels are welded. After the longitudinal seams are welded on the outside, the top circle wall panel 4 can be lifted using the inverted column 6. When lifting, loosen the fall chain at the seal appropriately to avoid lifting difficulties or lifting the second circle of wall panels. After lifting in place, tighten the sealing fall chain, measure the circumference, cut the allowance, spot weld the longitudinal seams at the seal, and then start to assemble the circumferential seams between the top circle and the second circle of wall panels. Use an electric fall chain to lower the back bar 8, reinstall it to the lower mouth of the second circle of wall panels, and tighten and fix it. Then install the third circle of wall panels on the outside of the second circle of wall panels, and repeat the above operations until the tank wall is fully installed.

[0049] In step i, a corbel is arranged on the inner side of the top of the tank chamber side wall 1, an outer ring beam is arranged along the inner side of the tank chamber side wall 1, an inner ring beam is arranged around the standard section of the tower crane 3, the inner ring beam is connected to the standard section of the tower crane 3 through a fall chain, an arc-shaped radial beam is set between the outer ring beam and the inner ring beam, and a secondary ring beam is arranged on the radial beam, and the outer ring beam, the inner ring beam, the radial beam and the secondary ring beam constitute a tank chamber vault template platform.

[0050] In step j, firstly, the operation room of tower crane 3 and the arm of tower crane 3 are dismantled, then the standard section of tower crane 3 is dismantled, and finally the tank room arch formwork platform is disassembled and dismantled.

[0051] Before the water filling experiment, settlement observation points are evenly set at the lower part of the bottom tank wall to observe the settlement of the tank body.

[0052] After completing the water filling experiment, rust removal and anti-corrosion work are carried out. Since the pretreatment area 9 except the weld part has been treated with rust removal and anti-corrosion during the steel plate prefabrication process, only the weld part needs to be treated with rust removal and anti-corrosion at this time, so the rust removal and anti-corrosion at the weld are carried out by a wall-climbing robot.

[0053] The present invention uses a processing plant to prefabricate, remove rust and prevent corrosion on the steel plate of the tank body, which can reduce the workload of on-site rust removal and anti-corrosion after the tank body is completed, which is beneficial to improving construction quality and work efficiency. The steel plate coating technology is also used to avoid the phenomenon of steel plate rusting after anti-corrosion in rainy and snowy weather, which in turn causes the problem of comprehensive rework. At the same time, a tower crane 3 is set at the center of the tank body as an installation device, which can be used in the civil construction stage and can also be used as a tool for vertical and horizontal transportation of steel oil tanks, avoiding damage caused by dragging of steel plates, greatly improving work efficiency and reducing construction costs. Finally, the wall-attached robot rust removal and anti-corrosion technology is used to remove rust and prevent corrosion on the weld after the water test is completed, which can avoid setting up an operating platform on the tank body, greatly improving work efficiency and shortening construction period.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A large dome oil tank installation and internal anti-corrosion construction technology, characterized in that: The following steps are involved: a. Dig the oil tank foundation pit covered with soil, and carry out the oil tank foundation construction at the bottom of the foundation pit; b. Install a tower crane at the center of the oil tank foundation. The tower crane serves as a vertical and horizontal transportation device. c. Prefabrication of tank bottom, tank top and tank wall steel plates is carried out in the processing plant. After the prefabricated steel plates are formed, they are firstly subjected to sandblasting and rust removal, and then anti-corrosion treatment is carried out on the areas except for a certain range above and below the weld; d. Use tower crane to construct the side wall of the concrete tank chamber of the earth-covered oil tank; e. Use a tower crane to transport the prefabricated steel plate of the tank bottom to the tank room for tank bottom construction; f. Use a tower crane to transport the prefabricated steel plates for the top wall panels of the tank body and the prefabricated steel plates for the tank top to the tank room for the construction of the tank body and the tank top. First, the top wall panels are constructed. After the top wall panels are constructed, the tank top is installed on the top wall panels; g. Use a tower crane to transport the prefabricated steel plates from the second circle on the tank body to the bottom circle wall panel to the tank room for construction, and use the chain inversion method to construct the tank body; h. Conduct non-destructive testing on welds; i. Use the standard section of the tower crane as a fixing part to set up the tank room vault formwork platform, support the formwork on the tank room vault formwork platform, and carry out the tank room vault concrete pouring construction; j. After the concrete of the tank room vault is completed and maintained to reach the designed strength, the formwork is removed and the tower crane is removed at the same time; asphalt sand is laid on the missing part of the tank bottom and the missing steel plate of the tank bottom is assembled; k. Carry out water filling test; l. Use a wall-climbing robot to perform rust removal and anti-corrosion work on the welds after completing the water filling test.

2. The large dome oil tank installation and internal anti-corrosion construction technology according to claim 1 is characterized in that: The tank bottom, tank top and tank wall steel plates are laid out, and the materials are cut and manufactured in the processing plant according to the layout drawings. The parts of the tank bottom, tank top and tank wall steel plates outside the 200mm range of the edge are painted for corrosion protection.

3. The large dome oil tank installation and internal anti-corrosion construction technology according to claim 1 is characterized in that: After the anti-corrosion treatment of the tank bottom, tank top and tank wall steel plates is completed, the steel plates are coated with a layer of plastic film adhered to the surface of the steel plates. Before the welding construction of the tank bottom, tank top and tank wall is carried out, the plastic film on the surface of the steel plates is removed.

4. The large dome oil tank installation and internal anti-corrosion construction technology according to claim 1 is characterized in that: In step f, 30 inverted columns are evenly distributed on concentric circles about 500 mm away from the tank wall inside the storage tank, a top plate and a lifting lug are set at the upper end of the inverted column, and the fall chain is fixed to the inverted column through the lifting lug; the lower end of each circle of wall panels is reinforced with a back bar, the back bar and the wall panel are fixed together with a gantry clamp, the lifting lug is welded on the back bar, and the lifting lug is lifted with a fall chain; when the tank top is installed, a window for the inverted column is reserved, and when the tank top is lifted to the top of the inverted column, the missing steel plate of the inverted column window is spliced.

5. The large dome oil tank installation and internal anti-corrosion construction technology according to claim 1 is characterized in that: In step i, a corbel is arranged on the inner side of the top of the tank chamber side wall, an outer ring beam is arranged along the inner side of the tank chamber side wall, an inner ring beam is arranged around the standard section of the tower crane, the inner ring beam is connected to the standard section of the tower crane through a fall chain, an arc-shaped radial beam is set between the outer ring beam and the inner ring beam, and a secondary ring beam is arranged on the radial beam, and the outer ring beam, the inner ring beam, the radial beam and the secondary ring beam constitute a tank chamber arch template platform.

6. The large dome oil tank installation and internal anti-corrosion construction technology according to claim 1 is characterized in that: In step j, the tower crane operating room and tower crane arm are first dismantled, then the tower crane standard section is dismantled, and finally the tank room arch formwork platform is disassembled and dismantled.

Images