Nuclear power storage tank modular assembly lifting device and method

Abstract

The application discloses a nuclear power storage tank modular assembly lifting device and method, relates to the technical field of nuclear power station installation, and aims to solve the problems of low precast assembly efficiency, high construction difficulty and high safety risk of a tank wall of an existing nuclear island storage tank. The storage tank modular assembly lifting device comprises a central column, the top end of the central column is connected with a plurality of variable-diameter cross beams, the two ends of the variable-diameter cross beams are respectively connected with the top end of the central column and a plurality of lifting columns, the plurality of lifting columns are connected through variable-distance cross beams, the polygonal frame structure of the device is formed through the connection of the lifting columns, the variable-distance cross beams and the variable-diameter cross beams, and a plurality of supporting piers are further distributed outside the polygonal frame structure; the supporting piers are used for supporting a tank wall arc-shaped steel plate group, the supporting piers can adjust the levelness of the tank wall arc-shaped steel plate, and the supporting piers adjust the perpendicularity of the tank wall arc-shaped steel plate in cooperation with inclined braces.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power plant installation technology, specifically relating to a modular assembly and lifting device and method for nuclear power storage tanks. Background Technology

[0002] In nuclear power plant installation projects, mechanical storage tanks, including demineralized water storage and distribution systems, chemical and volume control systems, fire protection systems, backup diesel engines and auxiliary boiler fuel systems, and liquid waste treatment systems, need to be prefabricated and assembled outside the nuclear island building. After the overall off-site assembly is completed, the entire tank is lifted by crane to the designated installation location inside the nuclear island. The storage tanks are cylindrical with an arc-shaped top, and modular assembly includes the tank bottom, top cover, tank walls, internal floating roof and its guardrails, ladders and platforms, manholes on the tank walls and top cover, piping interfaces, electrical and instrumentation interfaces, and other accessories. During prefabrication, the assembly of the tank walls involves a larger workload and a longer construction period compared to other parts.

[0003] The storage tank wall is assembled from several layers of ring-shaped steel plates, each layer of which is composed of several arc-shaped steel plates. Traditional tank wall assembly methods are cumbersome, requiring the construction of a ring-shaped scaffolding platform around the tank wall, depending on the assembly height. This method presents several problems: 1. The scaffolding for each tank wall assembly needs to be erected in multiple stages, resulting in a long construction period; 2. The hoisting process is cumbersome and inefficient; 3. As the tank wall assembly height increases, the construction difficulty and risks also increase. Summary of the Invention

[0004] The purpose of this invention is to provide a modular assembly and lifting device and method for nuclear power storage tanks, which solves the problems of low efficiency, construction difficulty and high safety risks in the prefabrication and assembly of existing nuclear island storage tank walls.

[0005] The technical solution adopted by this invention to solve its technical problem is: a modular assembly and lifting device for nuclear power storage tanks, characterized in that the modular assembly and lifting device for storage tanks includes: a central column, the top of the central column is connected to several variable diameter crossbeams, the two ends of the variable diameter crossbeams are respectively connected to the top of the central column and several lifting columns, the several lifting columns are connected by variable pitch crossbeams, and the lifting columns, the variable pitch crossbeams, and the variable diameter crossbeams form a polygonal frame structure of the device, and several support piers are distributed on the outside of the polygonal frame structure. The support piers are used to support the assembly of the arc-shaped steel plates of the tank wall, the support piers can adjust the horizontality of the arc-shaped steel plates of the tank wall, and the support piers, together with the diagonal braces, adjust the verticality of the arc-shaped steel plates of the tank wall.

[0006] The aforementioned modular assembly and lifting device for nuclear power storage tank is characterized in that the lifting columns are evenly distributed around the central column, and the top and bottom positions of each pair of adjacent lifting columns are connected by variable-pitch crossbeams.

[0007] The aforementioned modular assembly and lifting device for a nuclear power storage tank is characterized in that the lifting column includes: a support rod serving as the main support body, an upper top plate for connecting to a variable-diameter crossbeam at the top of the support rod, a lifting lug for suspending slings at the top of the support rod away from the central column, transverse connecting plates for connecting to the variable-pitch crossbeam at the top and bottom of the support rod, and a lower bottom plate for increasing the contact surface with the ground and sharing the pressure of the structure on the ground at the bottom of the support rod.

[0008] The aforementioned modular assembly and lifting device for a nuclear power storage tank is characterized in that the support pier includes: a limiting groove disposed on the support, the limiting groove restricting the position of the arc-shaped steel plate of the tank wall through baffles in its front and rear parts.

[0009] The aforementioned modular assembly and lifting device for a nuclear power storage tank is characterized in that the arc-shaped steel plates of the tank wall can be assembled and welded to form a complete annular steel plate for the tank wall.

[0010] The aforementioned modular assembly and lifting device for a nuclear power storage tank has tank wall lifting lugs on the inner side of the annular steel plate of the tank wall, which correspond one-to-one with the lifting lugs on the lifting column.

[0011] The aforementioned modular assembly and lifting device for a nuclear power storage tank is characterized in that an annular scaffolding platform is erected around the annular steel plate of the tank wall.

[0012] A method for modularly assembling and lifting a nuclear power storage tank, characterized in that it is used to operate the modularly assembling and lifting device for the nuclear power storage tank as described in any one of claims 1-7 to realize the modular assembly and lifting operation of the nuclear power storage tank, wherein the method includes: Step 1: Use a crane to place several curved steel plates of the tank wall onto the assembly support in sequence. After the longitudinal seams between the curved steel plates of the tank wall are aligned with the clamps, they are welded to form a ring-shaped steel plate of the tank wall. Step 2: Construct a ring-shaped scaffolding platform on the outer wall of the tank wall ring steel plate for the longitudinal and circumferential welding work between the lower tank wall arc steel plates; Step 3: After the circular scaffolding platform is erected, a safety inspection will be conducted. Construction work on the circular scaffolding platform will only commence after the safety inspection is passed. Step 4: Use the modular assembly and lifting device for the storage tank to lift the assembled top layer tank wall ring steel plate as a whole, so that there is enough space at the bottom for the assembly of the next layer of tank wall ring steel plate. Step 5: Continue assembling the next layer of tank wall arc steel plates on the circular scaffolding platform, and assemble them with the top layer of tank wall circular steel plates. The assembled plates will serve as the new top layer tank wall circular steel plates. Step Six: Repeat the steps four and five until the entire storage tank wall assembly is complete.

[0013] Compared with the prior art, the beneficial effects of the present invention are: the modular assembly and lifting device and method for nuclear power storage tank provided by the present invention shortens the construction cycle and improves construction efficiency by assembling each ring of steel plates of the tank wall of the inverted storage tank; and optimizes the construction process and reduces the construction difficulty. Attached Figure Description

[0014] Figure 1 The diagram shown is an overall schematic diagram of the tank wall assembly of a modular assembly and lifting device for nuclear power storage tanks according to the present invention. Figure 2 The diagram shown is a structural schematic of a modular assembly and lifting device for a nuclear power storage tank according to the present invention. Figure 3 The diagram shows the structural schematic of the lifting column of a modular assembly and lifting device for nuclear power storage tanks according to the present invention. Figure 4 The diagram shown is a structural schematic of the support pier of a modular assembly and lifting device for nuclear power storage tanks according to the present invention.

[0015] Explanation of reference numerals: 1. Modular assembly and lifting device for storage tank; 2. Diagonal brace; 3. Curved steel plate of tank wall; 4. Circular scaffolding platform; 11. Lifting column; 12. Support pier; 13. Variable pitch beam; 14. Variable diameter beam; 15. Central column; 111. Lifting lug; 112. Horizontal connecting plate; 113. Top plate; 114. Bottom plate; 115. Lifting slings; 116. Support rod; 121. Limiting groove; 122. Support. Detailed Implementation

[0016] To address the problems of low efficiency, high construction difficulty, and high safety risks associated with the prefabrication and assembly of existing nuclear island storage tank walls, this invention provides a modular assembly and lifting device and method for nuclear power storage tanks. Figures 1-4 As shown, the modular assembly and lifting device 1 for the storage tank includes: a central column 15, the top of the central column 15 is connected to several variable diameter crossbeams 14, the two ends of the variable diameter crossbeams 14 are respectively connected to the top of the central column 15 and several lifting columns 11, and the several lifting columns 11 are connected to each other by variable pitch crossbeams 13.

[0017] The lifting column 11, connected to the variable-pitch crossbeam 13 and the variable-diameter crossbeam 14, forms a polygonal frame structure for the device. The main function of the polygonal frame structure is to suspend the lifting slings. Several support piers 12 are also distributed on the outside of the polygonal frame structure. The support piers 12 are used to support the tank wall arc-shaped steel plates 3. The support piers 12 can adjust the horizontality of the tank wall arc-shaped steel plates 3, and the support piers 12, together with the diagonal braces 2, can adjust the verticality of the tank wall arc-shaped steel plates 3.

[0018] The lifting columns 11 are evenly distributed around the central column 15, with the central column 15 as the center. The top and bottom positions of each pair of adjacent lifting columns 11 are connected by variable-pitch beams 13. The variable-pitch beams 13 and the lifting columns 11 form polygonal frame support structures with different numbers of sides, and different lengths are used to form polygonal frame support structures with different numbers of sides. The main function of the variable-pitch beams (13) is to make the frame support structure more stable, and by cooperating with variable-pitch beams (13) of different lengths, polygonal frame support structures with different diameters can be formed.

[0019] The lifting column 11 includes: a support pole 116 as the main support; an upper top plate 113 at the top of the support pole 116 for connecting to the variable-diameter crossbeam 14; a lifting lug 111 at the top of the support pole 116 away from the central column 15 for suspending the lifting sling 115; transverse connecting plates 112 at the top and bottom of the support pole 116 for connecting to the variable-pitch crossbeam 13; and a lower bottom plate 114 at the bottom of the support pole 116 to increase the contact surface with the ground and distribute the pressure of the structure on the ground. The lifting sling 115 is mainly used for lifting storage tanks.

[0020] The support pier 12 includes a limiting groove 121 disposed on the support 122. The limiting groove 121, through baffles in its front and rear parts, restricts the position of the arc-shaped steel plate 3 of the tank wall. The limiting groove includes baffles in its front and rear parts, which restrict the position of the arc-shaped steel plate 3 of the tank wall, ensuring that the distance between any horizontal position of the arc-shaped steel plate 3 of the tank wall and the central column 15 remains the same. The levelness of the arc-shaped steel plate 3 of the tank wall can also be adjusted by shimming thin plates between the baffles.

[0021] The curved steel plates 3 of the tank wall can be assembled and welded to form a complete annular steel plate for the tank wall. The inner side of the annular steel plate is welded with lifting lugs that correspond one-to-one with the lifting lugs 111 on the lifting column 11, used for hoisting the entire tank wall. An annular scaffolding platform 4 can be erected around the annular steel plate. Construction activities such as the assembly and welding of longitudinal and circumferential welds between the curved steel plates 3 are carried out on this annular scaffolding platform 4.

[0022] The method for operating the aforementioned modular assembly and lifting device for nuclear power storage tanks to achieve modular assembly and lifting of nuclear power storage tanks includes: Step 1: Use a crane to place several curved steel plates 3 of the tank wall onto the assembly support in sequence. After the longitudinal seams between the curved steel plates 3 of the tank wall are aligned with the clamps, they are welded to form a ring-shaped steel plate of the tank wall. Step 2: Construct a ring-shaped scaffolding platform 4 on the outer wall of the annular steel plate of the tank wall for the longitudinal and circumferential welding work between the lower arc-shaped steel plates 3 of the tank wall; Step 3: After the circular scaffolding platform 4 is erected, a safety inspection will be conducted. Only after the safety inspection is passed can construction work begin on the circular scaffolding platform 4. Step 4: Use the modular assembly and lifting device 1 to lift the assembled top layer tank wall ring steel plate as a whole, so that there is enough space at the bottom for the tank wall arc steel plate 3 to assemble the next layer of tank wall ring steel plate; Step 5: Continue assembling the next layer of tank wall arc steel plate 3 on the circular scaffolding platform 4, and assemble it with the top layer of tank wall circular steel plate. After assembly, it will serve as the new top layer tank wall circular steel plate. Step Six: Repeat the steps four and five until the entire storage tank wall assembly is complete.

[0023] Example: In this embodiment, the tank wall annular steel plate is formed by splicing together four tank wall arc-shaped steel plates 3, and the tank wall includes six layers of tank wall annular steel plates.

[0024] Step 1: Use a crane to place the four curved steel plates 3 of the sixth layer of the tank wall onto the assembly support in sequence. After the longitudinal seams between the curved steel plates 3 of the tank wall are aligned with the clamps, they are welded to form the annular steel plate of the sixth layer of the tank wall. Step 2: Construct a ring-shaped scaffolding platform 4 around the outer perimeter of the ring-shaped steel plate of the tank wall on the 6th layer for the longitudinal and circumferential welding work between the arc-shaped steel plates 3 of the tank wall on the 5th layer below. Step 3: After the circular scaffolding platform 4 is erected, a safety inspection will be conducted. Only after the safety inspection is passed can construction work begin on the circular scaffolding platform 4. Step 4: Use the modular assembly and lifting device 1 to lift the assembled sixth layer of tank wall ring steel plate as a whole, so that there is enough space at the bottom for the tank wall arc steel plate 3 to assemble the next layer of tank wall ring steel plate. Step 5: Continue assembling the fifth layer of the tank wall arc steel plate 3 on the circular scaffolding platform, and assemble it with the sixth layer of the tank wall ring steel plate; Step 6: Use the modular assembly and lifting device 1 to lift the assembled annular steel plates of the tank wall on the 5th and 6th layers as a whole, so that there is enough space at the bottom to assemble the arc-shaped steel plate 3 of the 4th layer of the tank wall. Step 7: Continue assembling the fourth layer of the tank wall arc steel plate 3 on the circular scaffolding platform, and assemble it with the fifth and sixth layers of the tank wall annular steel plate; Step 8: Use the modular assembly and lifting device 1 to lift the assembled annular steel plates of the tank wall of the 4th, 5th and 6th layers as a whole, so that there is enough space at the bottom to assemble the arc-shaped steel plate 3 of the 3rd layer of the tank wall. Step 9: Continue assembling the third layer of the tank wall arc steel plate 3 on the circular scaffolding platform, and assembling it with the fourth, fifth, and sixth layers of the tank wall annular steel plates; Step 10: Use a lifting device to lift the assembled tank wall ring steel plates of the 3rd, 4th, 5th and 6th layers as a whole, so that there is enough space at the bottom to assemble the 2nd layer of tank wall arc steel plate 3; Step 11: Continue assembling the second layer of tank wall arc-shaped steel plate 3 on the circular scaffolding platform, as well as assembling it with the third, fourth, fifth, and sixth layers of tank wall circular steel plates; Step 12: Use the lifting device to lift the assembled ring steel plates of the 2nd, 3rd, 4th, 5th and 6th layers as a whole, so that there is enough space at the bottom to assemble the arc-shaped steel plate 3 of the 1st layer of the tank wall; Step Thirteen: Continue assembling the first layer of tank wall arc steel plate 3 on the circular scaffolding platform, as well as assembling the second, third, fourth, fifth, and sixth layers of tank wall annular steel plates to complete the assembly of the entire storage tank wall.

[0025] It should be noted that the combination of the technical features in the embodiments of the present invention is not limited to the combination methods described in the embodiments of the present invention or the combination methods described in the specific embodiments. All technical features described in the present invention can be freely combined or combined in any way, unless there is a contradiction between them.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modular assembly and lifting device for a nuclear power storage tank, characterized in that, The modular assembly and lifting device (1) for the storage tank includes: a central column (15), the top of the central column (15) is connected to several variable diameter crossbeams (14), the two ends of the variable diameter crossbeams (14) are respectively connected to the top of the central column (15) and several lifting columns (11), the several lifting columns (11) are connected by variable pitch crossbeams (13), and the lifting columns (11), variable pitch crossbeams (13), and variable diameter crossbeams (14) form a polygonal frame structure of the device. Several support piers (12) are also distributed outside the polygonal frame structure. The support piers (12) are used to support the assembly of the arc-shaped steel plates (3) of the tank wall. The support piers (12) can adjust the horizontality of the arc-shaped steel plates (3) of the tank wall. The support piers (12) cooperate with the diagonal braces (2) to adjust the verticality of the arc-shaped steel plates (3) of the tank wall.

2. The modular assembly and lifting device for a nuclear power storage tank according to claim 1, characterized in that, The lifting columns (11) are evenly distributed around the center column (15) with the center column (15) as the center position. The top and bottom positions of each pair of adjacent lifting columns (11) are connected by a variable-pitch crossbeam (13).

3. The modular assembly and lifting device for a nuclear power storage tank according to claim 2, characterized in that, The lifting column (11) includes: a support rod (116) as the main support body, the top of the support rod (116) is provided with an upper top plate (113) for connecting with the variable diameter crossbeam (14), the top of the support rod (116) is provided with a lifting lug (111) for suspending the sling (115) on the side away from the central column (15), the top and bottom of the support rod (116) are also provided with a transverse connecting plate (112) for connecting with the variable pitch crossbeam (13), and the bottom end of the support rod (116) is provided with a lower bottom plate (114) for increasing the contact surface with the ground and sharing the pressure of the structure on the ground.

4. The modular assembly and lifting device for a nuclear power storage tank according to claim 1, characterized in that, The support block (12) includes a limiting groove (121) provided on the support (122). The limiting groove (121) restricts the position of the arc-shaped steel plate (3) of the tank wall through the baffles in its front and rear parts.

5. A modular assembly and lifting device for a nuclear power storage tank according to claim 1, characterized in that, The arc-shaped steel plate (3) of the tank wall can be assembled and welded to form a complete ring-shaped steel plate of the tank wall.

6. A modular assembly and lifting device for a nuclear power storage tank according to claims 4 and 5, characterized in that, The inner side of the annular steel plate of the tank wall is provided with tank wall lifting lugs that correspond one-to-one with the lifting lugs (111) on the lifting column (11).

7. A modular assembly and lifting device for a nuclear power storage tank according to claim 5, characterized in that, A ring-shaped scaffolding platform (4) is erected around the annular steel plate of the tank wall.

8. A modular assembly and lifting method for nuclear power storage tanks, characterized in that, The method is used to operate the modular assembly and lifting device for nuclear power storage tanks as described in any one of claims 1-7 to realize the modular assembly and lifting operation of nuclear power storage tanks, wherein the method includes: Step 1: Use a crane to place several tank wall arc steel plates (3) onto the assembly support in sequence. The longitudinal seams between the tank wall arc steel plates (3) are aligned with the clamps and then welded to form a tank wall ring steel plate. Step 2: A ring-shaped scaffolding platform (4) is erected on the outer wall of the ring-shaped steel plate of the tank wall for the longitudinal and circumferential welding work between the arc-shaped steel plates (3) of the lower tank wall; Step 3: After the circular scaffolding platform (4) is erected, a safety inspection will be carried out. After the safety inspection is passed, the construction work on the circular scaffolding platform (4) will begin. Step 4: Use the modular assembly and lifting device (1) to lift the assembled top layer tank wall ring steel plate as a whole, so that there is enough space at the bottom for the tank wall arc steel plate (3) to assemble the next layer of tank wall ring steel plate. Step 5: Continue to assemble the next layer of tank wall arc steel plate (3) on the circular scaffolding platform (4), and assemble it with the top layer of tank wall ring steel plate. After assembly, it will serve as the new top layer tank wall ring steel plate. Step Six: Repeat the steps four and five until the entire storage tank wall assembly is complete.

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