4000 m spherical tank assembly construction method

Abstract

The invention relates to a 4000m spherical tank assembly construction method. The method comprises the following steps: respectively connecting support columns with foundation bolts on a foundation according to design positions; sequentially hoisting a first equatorial plate and a second equatorial plate which are provided with supporting columns and mounting the first equatorial plate and the second equatorial plate with the supporting columns; hoisting a first equatorial plate without a strut, inserting the first equatorial plate and a second equatorial plate with the strut, fixing the first equatorial plate with the strut and the second equatorial plate with the strut by using a gantry fixture, and adjusting a welding seam gap; hoisting an equatorial plate with a strut and another equatorial plate without the strut in sequence until the equatorial plate is closed; and sequentially assembling the temperature zone plate, the lower polar plate and the upper polar plate. In the assembling process, the spherical shell plates are installed one by one, so that stress distribution in the assembling process can be more uniform, the risk that the spherical tank is deformed or damaged due to stress concentration is reduced, and the quality and the service life of the spherical tank can be guaranteed.

Description

Technical Field

[0001] The invention relates to the installation of chemical equipment, and in particular to an assembly construction method for a 4000m³ spherical tank. Background Art

[0002] The 4000m³ hybrid carbon four-spherical storage tank has a hybrid four-belt structure with an inner diameter of Φ19700mm and a material of Q345R. There are 62 spherical shell plates, including 24 equatorial plates, 24 temperate plates, 8 polar edge plates, 4 polar side plates, and 2 polar mid plates. The thickness of the spherical shell plate is 30mm. The spherical tank has 12 pillars, which are welded to the equatorial belt plate of the spherical shell, and adjustable tie rods are installed between the pillars.

[0003] The on-site assembly of this large spherical tank is the key in the construction process of the spherical tank. The on-site assembly is difficult, involves many construction machines and tools, and has high quality requirements. If the quality of the on-site assembly of the spherical tank is not well controlled, the quality of subsequent welding work will be difficult to control, which will affect the use of the spherical tank. In particular, during the assembly process, stress concentration may cause deformation or damage to the spherical tank. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a 4000m³ spherical tank assembly construction method to reduce the risk of deformation or damage of the spherical tank due to stress concentration.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a 4000m³ spherical tank assembly construction method, comprising the following steps: Step 1: Arrange and weld positioning blocks on the edge of each spherical shell plate, wherein the positioning blocks cooperate with the gantry fixture to adjust the weld gap between the spherical shell plates; Step 2: Install the support pillars; Connect the pillars to the anchor bolts on the foundation according to the designed positions; Step 3: Equatorial plate assembly. Sequentially hoist the first equatorial plate and the second equatorial plate with pillars and install them with the pillars; Lift the first equatorial plate without pillars, insert it between the first and second equatorial plates with pillars, fix it with a gantry fixture, and adjust the weld gap; After each equatorial plate with a support is hoisted, a plate without a support is hoisted in sequence until it is closed; Step 4: Temperate plate assembly, Lift each temperate plate in turn, connect the lower equatorial plate and the adjacent temperate plate and equatorial plate with a gantry fixture, and adjust the gap, staggered edge, curvature, and angularity of the corresponding annular seam and longitudinal seam to meet the standard, and lock and fix them until the last temperate plate is in place and closed into an annular belt; Step 5: Assemble the lower plate. Lift each lower pole plate in turn, connect the upper equatorial plate and the adjacent lower pole plate with a gantry clamp, adjust the weld gap and tighten until closed; Step 6: Assemble the upper plate. Lift each upper pole plate in turn, connect the lower equatorial plate and the adjacent upper pole plate with a gantry clamp, adjust the weld gap and tighten until closed.

[0006] As a preferred implementation, in step one, positioning blocks are welded on the spherical shell plate at a distance of 200 mm from the weld, and the spacing between each positioning block is 800 to 1000 mm.

[0007] As a preferred implementation, in step 2, two steel wire ropes are used to vertically hoist the pillars, and after tightening the anchor bolts, tie rods are installed between the pillars.

[0008] As a preferred embodiment, in step three, when hoisting the equatorial plate, a wind cable is used for temporary stabilization.

[0009] As a preferred implementation, in step 4, the center line of the temperate plate is aligned with the longitudinal seam of the equatorial plate.

[0010] As a preferred implementation, in step four, the temperate plate is connected to the ground by a hand chain hoist, and the inclination angle of the temperate plate is adjusted by the hand chain hoist.

[0011] As a preferred embodiment, in step five, the lower part of the lower pole plate is fixed to the small square on the outer side of the spherical shell plate by using a hand chain hoist and a wire rope for hoisting, and the horizontality of the spherical shell plate is adjusted by using the hand chain hoist.

[0012] As a preferred embodiment, in step six, when hoisting the upper pole plate, the upper pole side plates on both sides are hoisted first, and then the middle upper pole middle plate is hoisted.

[0013] According to the spherical tank assembly construction method of the present invention, during the assembly process, the spherical shell plates are installed piece by piece, which can make the stress distribution during the assembly process more uniform, reduce the risk of deformation or damage of the spherical tank due to stress concentration, and is beneficial to ensuring the quality and service life of the spherical tank.

[0014] The method provided by the present invention can be applied to the assembly of spherical tanks of various specifications and forms, especially for 4000m 3 Assembly and construction of the stadium. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings herein are used to provide further explanation of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] Figure 1 A schematic diagram of the structure of the assembly fixture provided by the present invention; Figure 2 A schematic diagram of the installation of the equatorial plate provided by the present invention; Figure 3 A schematic diagram of the equatorial plate provided by the present invention after assembly; Figure 4 A schematic diagram of the temperate panel provided by the present invention after assembly; Figure 5 A schematic diagram of the spherical tank provided by the present invention after being assembled.

[0017] In the figure, 1-square cap, 2-gantry plate, 3-square pin, 4-cone pin, 5-key plate, 6-spherical shell plate, 7-pillar, 8-equatorial plate with pillar, 9-equatorial plate without pillar, 10-temperate plate, 11-upper pole plate, 12-pull rod, 13-foundation. DETAILED DESCRIPTION

[0018] In order to make those skilled in the art better understand the present invention, the present invention is further clearly and completely described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the features in the embodiments and examples of this application can be combined with each other.

[0019] A typical embodiment of the present invention provides a spherical tank assembly construction method, comprising the following steps: Step 1: Arrange and weld positioning blocks on the edge of each spherical shell plate 6, and the positioning blocks cooperate with the gantry fixture to adjust the weld gap between the spherical shell plates; Step 2: Install the support 7; Connect the pillars 7 to the anchor bolts on the foundation 13 according to the designed positions; Step 3: Equatorial plate assembly. Sequentially hoist the first equatorial plate 8 with pillars and the second equatorial plate 8 with pillars and install them with the pillars 7; Lift the first equatorial plate 9 without pillars, insert it between the first and second equatorial plates with pillars, fix it with a gantry fixture, and adjust the weld gap; After each equatorial plate 8 with a support is hoisted, a equatorial plate 9 without a support is hoisted in sequence until it is closed; Step 4: Assemble the temperate plate 10. Lift each temperate plate 10 in turn, connect the lower equatorial plate and the adjacent temperate plate 10 and equatorial plate with a gantry fixture, and adjust the gap, staggered edge, curvature and angularity of the corresponding annular seam and longitudinal seam to meet the standard, and lock and fix them until the last temperate plate 10 is in place and closed into an annular belt; Step 5: Assemble the lower plate. Lift each lower pole plate in turn, connect the upper equatorial plate and the adjacent lower pole plate with a gantry clamp, adjust the weld gap and tighten until closed; Step 6: assemble the upper electrode plate 11. Lift each upper pole plate 11 in turn, connect the lower equatorial plate and the adjacent upper pole plate 11 with a gantry clamp, adjust the weld gap and lock and fix until closed.

[0020] According to this embodiment, a spherical tank installation method with low assembly stress is provided, which reduces the risk of deformation or damage of the spherical tank due to stress concentration, and is conducive to ensuring the quality and service life of the spherical tank.

[0021] The following is a relatively specific embodiment to further clearly and completely illustrate the technical solution claimed by the present invention.

[0022] The present embodiment describes a 4000m³ mixed carbon four-spherical storage tank spherical shell, which is a hybrid four-band structure type, with an inner diameter of Φ19700mm, made of Q345R, and a total of 62 spherical shell plates, including 24 equatorial plates, 24 temperate plates, 8 polar edge plates, 4 polar side plates, and 2 polar mid plates. The thickness of the spherical shell plate is 30mm, and the spherical tank has a total of 12 pillars 7, which are welded to the spherical shell equatorial plate, and an adjustable tie rod 12 is installed between the pillars 7.

[0023] The spherical shell plates are installed piece by piece to achieve the purpose of fast assembly speed and easy to ensure the geometric shape and size of the sphere; according to the actual situation on site, the location and height of the spherical tank and the lifting capacity of the crane, this embodiment uses two specifications of cranes: the spherical shell plate assembly uses a 130T crawler crane and a 50T truck crane. The 130T crawler crane is used as the main crane for the spherical tank assembly, and the 50-ton truck crane cooperates with it. Specifically, it includes the following steps.

[0024] Step 1: Positioning of assembly fixture; The spherical shell plate 6 is welded with a positioning block 200mm away from the weld; the spacing between each positioning block is 800-1000mm. For the spherical shell plate with large deformation, the number of positioning blocks can be increased to ensure the quality of the spherical shell plate assembly.

[0025] The positioning block is used in conjunction with the gantry fixture, such as Figure 1 As shown, the gantry fixture includes a square cap 1, a gantry plate 2, a square pin 3, a cone pin 4 and a key plate 5. The key plate 5 includes a bottom plate and a side plate. A square hole is opened in the middle of the bottom plate. The square cap 1 is placed at the square hole of the bottom plate. Two sets of square caps 1 are respectively put on the positioning blocks of the spherical shell plates on both sides of the weld. Through holes are opened on the positioning blocks and the square caps 1. The positioning blocks and the square caps 1 are fixed by the cone pins 4 inserted into the through holes. The gantry plate 2 is clamped above the two key plates 5 and the gantry plate 2 spans the two spherical shell plates 6. The square pins 3 are inserted between the square cap 1 and the side plates of the key plate 5, and the gap between the spherical shell plates is adjusted by the square pins 3.

[0026] The purpose of arranging the positioning blocks is to ensure that the misalignment and clearance are adjusted to the specified tolerance requirements. The number of positioning blocks is determined according to the geometric dimensions of the spherical shell plate.

[0027] The positioning blocks should be welded before the spherical shell plate is hoisted. The welding position should be drawn before welding to ensure that all shell plate positioning blocks correspond one to one and the adjustment fixtures are used properly. The allowable deviation is ±5mm.

[0028] The lower pole plate positioning block is welded on the inner side of the shell plate, and the equatorial plate, temperate plate and upper pole plate positioning blocks should be welded on the outer side of the shell plate. Because the positioning blocks are also the lifting points and the supporting points of the spherical shell plates during installation, the welds should be continuous and full, and the weld angle height should not be less than 20mm to ensure the connection strength of the positioning blocks.

[0029] Step 2: Install the support 7; After the positioning block is welded, two steel wire ropes are used to vertically hoist the support 7, tighten the anchor bolts, and install the pull rod 12.

[0030] Step 3: Equatorial plate assembly: equatorial plate long side arc length (9455.4 / 9727.2mm), short side arc length (2556.7 / 1742.2mm), equatorial plate unit weight (5207kg).

[0031] 1) Hoist the first and second equatorial plates 8 with pillars and fix them to pillars 7 respectively. When the first equatorial plate with pillars is hoisted, it is temporarily stabilized with wind cables. At least one steel wire rope is pulled for each ball plate. The selected steel wire rope must be a qualified product with tensile strength sufficient to pull the ball plate firmly to ensure safety. The foundation of the steel wire rope end must also be firm enough to pull the ball plate firmly.

[0032] 2) If Figure 2 As shown, the first equatorial plate 9 without pillars is hoisted, inserted between the first and second equatorial plates with pillars, fixed with a gantry clamp and the weld gap is adjusted.

[0033] 3) Then, hoist each equatorial plate 8 with a support, and then hoist an equatorial plate 9 without a support, and hoist them in sequence until they are closed. Figure 3 shown.

[0034] Step 4: Assemble the temperate panel 10: The long side arc length of the temperate panel is (6876.6 mm), the short side arc length is (2556.7 / 1742.2 mm), and the single weight of the temperate panel is (3641 kg).

[0035] Lift the temperate plate 10, make the lower side of the temperate plate 10 butt joint with the upper side of the equatorial plate, connect them with a gantry fixture, align the center line of the temperate plate 10 with the longitudinal seam of the equatorial plate, connect the upper end with the ground with a hand chain hoist, and adjust the inclination of the temperate plate 10 with the hand chain hoist, so that the gap, misalignment, curvature and angularity values ​​at the circumferential seam between the temperate plate 10 and the equatorial plate meet the standards, and then lock the gantry fixture.

[0036] Then, the second temperate plate 10 is hoisted in the same way, connected to the first temperate plate and the equatorial plate by a gantry fixture, and the gap, staggered edge, curvature and angular value of the corresponding annular seam and longitudinal seam are adjusted to meet the standard, and then locked and fixed. The rest of the matters are the same as the hoisting of the equatorial plate. Until the last upper temperate plate is in place and closed into a ring belt, such as Figure 4 shown.

[0037] Step 5: Assembly of lower pole plate: arc length of long side of pole center plate (8767.6 / 8683.5mm), arc length of short side (2641.5mm), weight of pole center plate (5838kg); arc length of long side of pole side plate (8683.5 / 8008.6mm), arc length of short side (2683.6mm), weight of pole side plate (5627kg); arc length of long side of pole side plate (10453 / 8008.6mm), arc length of short side (1461mm), weight of pole side plate (5186kg); The lower part of the ball plate is fixed to the small square outside the ball shell plate with a hand chain hoist and a wire rope for hoisting. The horizontality and balance of the ball shell plate are adjusted with a hand chain hoist, and assembled and fixed with a gantry clamp. When all gantry clamps lock the annular seam part and align with the reference line, the crane can be unhooked, and then the remaining lower pole side plates are hoisted into place in turn and adjusted.

[0038] Step 6: Upper plate assembly The hoisting method is the same as the hoisting method of the lower pole plate. When hoisting, the upper pole side plates on both sides are hoisted first, and then the middle upper pole middle plate is hoisted. Figure 5 shown.

[0039] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A 4000m³ spherical tank assembly construction method, characterized in that: The following steps are involved: Step 1: Arrange and weld positioning blocks on the edge of each spherical shell plate, wherein the positioning blocks cooperate with the gantry fixture to adjust the weld gap between the spherical shell plates; Step 2: Install the support pillars; Connect the pillars to the anchor bolts on the foundation according to the designed positions; Step 3: Equatorial plate assembly. Sequentially hoist the first equatorial plate and the second equatorial plate with pillars and install them with the pillars; Lift the first equatorial plate without pillars, insert it between the first and second equatorial plates with pillars, fix it with a gantry fixture, and adjust the weld gap; After each equatorial plate with a support is hoisted, a plate without a support is hoisted in sequence until it is closed; Step 4: Temperate plate assembly, Lift each temperate plate in turn, connect the lower equatorial plate and the adjacent temperate plate and equatorial plate with a gantry fixture, and adjust the gap, staggered edge, curvature, and angularity of the corresponding annular seam and longitudinal seam to meet the standard, and lock and fix them until the last temperate plate is in place and closed into an annular belt; Step 5: Assemble the lower plate. Lift each lower pole plate in turn, connect the upper equatorial plate and the adjacent lower pole plate with a gantry clamp, adjust the weld gap and tighten until closed; Step 6: Assemble the upper plate. Lift each upper pole plate in turn, connect the lower equatorial plate and the adjacent upper pole plate with a gantry clamp, adjust the weld gap and tighten until closed.

2. The spherical tank assembly construction method according to claim 1 is characterized in that: In step 1, a positioning block is welded on the spherical shell plate at a distance of 200 mm from the weld, and the spacing between each positioning block is 800 to 1000 mm.

3. The spherical tank assembly construction method according to claim 1 or 2, characterized in that: In step 2, two steel wire ropes are used to vertically hoist the pillars, and after tightening the anchor bolts, tie rods are installed between the pillars.

4. The spherical tank assembly construction method according to claim 1, 2 or 3, characterized in that: In step three, when hoisting the equatorial plate, use wind cables for temporary stabilization.

5. The spherical tank assembly construction method according to claim 4 is characterized in that: In step 4, the centerline of the temperate plate is aligned with the longitudinal seam of the equatorial plate.

6. The spherical tank assembly construction method according to claim 1 or 5, characterized in that: In step 4, the temperate plate is connected to the ground by a hand chain hoist, and the inclination angle of the temperate plate is adjusted by the hand chain hoist.

7. The spherical tank assembly construction method according to claim 6 is characterized in that: In step five, the lower part of the lower pole plate is fixed to the small square on the outer side of the spherical shell plate by a hand chain hoist and a steel wire rope for hoisting, and the horizontality of the spherical shell plate is adjusted by the hand chain hoist.

8. The spherical tank assembly construction method according to claim 7 is characterized in that: In step six, when hoisting the upper pole plate, first hoist the upper pole side plates on both sides, and then hoist the middle upper pole middle plate.

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