Containment steel lining

Abstract

The utility model discloses a containment steel lining, which comprises a plurality of sections of steel plates, each section of steel plate is bent along the arc length direction and has a specific angle, each section of steel plate is bent along the width direction and is arc-shaped, and the bending radiuses of the plurality of sections of steel plates are the same; and the plurality of sections of steel plates are spliced into a ring. The reinforcing joint for the containment steel lining is formed by splicing a plurality of sections of steel plates into a ring and then can be directly transferred to a manufacturing site to serve as the reinforcing joint for the containment steel lining to be integrally assembled, and each section of steel plate integrally forms a bending form with a specific angle in advance, so that the turning angle of a transition area of the containment steel lining is met, and the angle is prevented from being adjusted on site; deformation can be controlled, the quality of the reinforced joint is guaranteed, workshop prefabrication and on-site construction are organized in parallel, and the construction quality and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear power plant containment vessel manufacturing technical field especially, relates to a kind of containment vessel steel lining reinforcement node and containment vessel steel lining. BACKGROUND

[0002] Containment vessel steel lining belongs to nuclear secondary equipment, is the key component of pressure vessel, is the last barrier of nuclear power leakage prevention, its main function is to provide reliable sealing, to prevent radioactive material from nuclear power plant internal leakage to external environment, can withstand certain internal pressure, to ensure the safe operation of nuclear power plant, provide enough durability, to resist various corrosion and wear during long-term operation.Containment vessel steel lining is crucial to ensure the safe operation of nuclear power plant and environmental protection.

[0003] Containment vessel steel lining diameter can reach 45m, nuclear power engineering steel lining bottom plate and conic body reinforcement section adopt welding connection form, generally by welding from multiple cylinder or conic steel material, in steel lining bottom plate and conic body, conic body and cylinder wall plate transition area, design has irregular shape from thickened steel plate processing reinforcement node.Reinforcement node belongs to important component of steel lining, construction quality requirement is high.

[0004] Traditional construction method is welded into L type after being machined to smooth transition by two steel plates.Because reinforcement node cross section size is small, shape is irregular, welding process is used to process reinforcement node, welding quality is difficult to guarantee and welding deformation is not easy to control, the dependence on welding technician is high, and a large amount of welding equipment and human resources need to be invested, with high cost. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problems, and provides a kind of containment vessel steel lining reinforcement node and containment vessel steel lining.

[0006] The utility model solves the technical problems and adopts the technical scheme that a kind of containment vessel steel lining reinforcement node, including several segments steel plate, each segment steel plate is curved along arc length direction and is equipped with specific angle, each segment steel plate is curved along width direction and is arc-shaped, and the bending radius of several segments steel plate is identical;

[0007] Several segments steel plate are spliced into ring.

[0008] In some embodiments, the steel plate includes a first straight edge, a bend angle and a second straight edge, the width of the first straight edge and the second straight edge is similar or equal and is respectively arranged at both ends of the bend angle, and the bend angle is circular arc.

[0009] In some embodiments, the width difference between the first straight edge and the second straight edge is not greater than 2mm.

[0010] In some embodiments, thicknesses of the first straight edge and the second straight edge decrease outwardly from the bent corner, respectively.

[0011] In some embodiments, the first straight edge comprises a first transition section and a first straight edge section, the first transition section is arranged between the bent corner and the first straight edge section, thickness of the first transition section decreases from the bent corner to the first straight edge section, thickness of the first straight edge section is less than or equal to the minimum thickness of the first transition section.

[0012] The second straight edge comprises a second transition section and a second straight edge section, the second transition section is arranged between the bent corner and the second straight edge section, thickness of the second transition section decreases from the bent corner to the second straight edge section, thickness of the second straight edge section is less than or equal to the minimum thickness of the second transition section.

[0013] In some embodiments, thickness of the first transition section and / or the second transition section is transitioned from 1:4 of the thickness of the steel plate to 6mm-7.5mm.

[0014] In some embodiments, the radius of the circular arc inside the bent corner is 1-2 times the thickness of the steel plate.

[0015] In some embodiments, the arc length of any two sections of the steel plate is the same or different, and adjacent two sections of the steel plate are welded and fixed.

[0016] In some embodiments, the specific angle is 90°-160°, and the thickness of the steel plate is 22mm-30mm.

[0017] The utility model further constructs a kind of containment steel lining, including bottom plate, several main cylinder and several above-mentioned any one containment steel lining reinforcing node, the axial both ends of the containment steel lining reinforcing node are respectively welded and fixed with the bottom plate and the main cylinder, or, the axial both ends of the containment steel lining reinforcing node are respectively welded and fixed with adjacent two main cylinder.

[0018] By implementing the utility model, the following beneficial effects are achieved:

[0019] The containment steel lining reinforcing node of the utility model is directly transferred to manufacturing site to serve as the reinforcing node integral assembly of containment steel lining after being spliced into ring by multiple steel plates, each steel plate is integrally formed into the bent mode of specific angle in advance, the turning angle of transition area of containment steel lining is satisfied, on-site angle adjustment is avoided, deformation can be controlled and the quality of reinforcing node is guaranteed, workshop prefabrication and on-site construction parallel organization are realized, and construction quality and efficiency are improved.

[0020] The safety shell steel lining, the safety shell steel lining reinforcing node can be integrally formed into a bending mode with a specific angle in advance, meets the turning angle of the safety shell steel lining transition area, uses the safety shell steel lining reinforcing node to be integrally welded and fixed with the bottom plate or the main cylinder, reduces the welding construction quantity on site and the dependence on welding technicians. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further described below in combination with the drawings and examples, and the drawings are as follows:

[0022] Figure 1 It is a simplified structure schematic diagram of part structure of the safety shell steel lining of one embodiment of the utility model;

[0023] Figure 2 It is Figure 1 It is a structure schematic diagram of a section of steel plate of the safety shell steel lining reinforcing node of A structure in the middle;

[0024] Figure 3 It is Figure 1 It is a sectional view of the steel plate of A structure in the middle;

[0025] Figure 4 It is Figure 1 It is a sectional view of the steel plate of B structure in the middle;

[0026] Figure 5 It is Figure 1 It is a sectional view of the steel plate of C structure in the middle. DETAILED DESCRIPTION

[0027] In order to have more clear understanding on the technical features, purposes and effects of the utility model, the specific implementation mode of the utility model will be described in detail by referring to the drawings.

[0028] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0029] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0030] In the description of the utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be chemically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] Referring to Figures 1 to 5 An embodiment of the utility model discloses a containment steel lining, including bottom plate 5, a plurality of main cylinder 6 and a plurality of containment steel lining reinforcing nodes, the axial two ends of containment steel lining reinforcing node are respectively welded and fixed with bottom plate 5 and main cylinder 6, or the axial two ends of containment steel lining reinforcing node are respectively welded and fixed with adjacent two main cylinder 6. Wherein, three containment steel lining reinforcing nodes are generally included in a containment steel lining, Figure 1 The A structure, B structure and C structure shown are three different position modes of containment steel lining reinforcing node, referring to Figures 3 to 5 For example, in the A structure, the axial two ends of containment steel lining reinforcing node are respectively welded and fixed with two main cylinder 6, and B structure is the same. The difference is that, in the C structure, the axial two ends of containment steel lining reinforcing node are respectively welded and fixed with bottom plate 5 and one main cylinder 6. The above-mentioned main cylinder 6 is the main steel structure constituting the containment steel lining, and the main cylinder 6 can be a conical cylinder or a cylindrical cylinder. Generally, the cross section of main cylinder 6 is circular.

[0032] The reinforcing joint of the containment steel liner comprises a plurality of steel plates 1, each of which is curved along the arc length direction and has a specific angle, is curved along the width direction and has an arc shape, and has the same bending radius as the other steel plates 1. The plurality of steel plates 1 are spliced into a ring. As shown in Figure 2 the structure of one steel plate 1, the arc lengths of any two steel plates 1 are the same or different, and the adjacent two steel plates 1 are welded and fixed. The arc lengths of the other steel plates 1 can be the same as or different from the arc length of the steel plate 1, and the total arc length of all the steel plates 1 can form a ring circumference. The structures of the other steel plates 1 except for the arc lengths are the same as the steel plate 1. The specific angle of each steel plate 1 curved along the arc length direction can be adjusted as needed, and is generally 90°-160°, L-shaped or V-shaped structure, such as 90°, 100°, 120°, 150°, etc.

[0033] In some embodiments, the steel plate 1 comprises a first straight edge 2, a curved corner 3, and a second straight edge 4, the widths of the first straight edge 2 and the second straight edge 4 are similar or equal and are respectively arranged at both ends of the curved corner 3, and the curved corner 3 is in a circular arc shape. The widths of the first straight edge 2 and the second straight edge 4 are generally 100mm-200mm, and when the widths of the first straight edge 2 and the second straight edge 4 are similar, the difference between the width of the first straight edge 2 and the width of the second straight edge 4 is not greater than 2mm. For example, the first straight edge 2 is 150mm, and the width of the second straight edge 4 is in the range of 148mm-152mm, which can be 148mm, 150mm, or 151mm, etc.

[0034] In some embodiments, the thicknesses of the first straight edge 2 and the second straight edge 4 decrease outwardly from the curved corner 3, respectively. It is preferred to have a smooth transition outwardly from the curved corner 3 to ensure the rigidity of the reinforcing joint of the containment steel liner and the normal transition connection with the main cylinder 6 or the bottom plate 5, preventing abnormal protrusions from affecting the internal space and the original function.

[0035] In some embodiments, the first straight edge 2 comprises a first transition section 21 and a first straight edge section 22, the first transition section 21 is arranged between the curved corner 3 and the first straight edge section 22, the thickness of the first transition section 21 decreases from the curved corner 3 to the first straight edge section 22, and the thickness of the first straight edge section 22 is less than or equal to the minimum thickness of the first transition section 21. The second straight edge 4 comprises a second transition section 41 and a second straight edge section 42, the second transition section 41 is arranged between the curved corner 3 and the second straight edge section 42, the thickness of the second transition section 41 decreases from the curved corner 3 to the second straight edge section 42, and the thickness of the second straight edge section 42 is less than or equal to the minimum thickness of the second transition section 41. The first straight edge section 22 and the second straight edge section 42 are respectively used for welding and fixing with the main cylinder 6 and / or the bottom plate 5.

[0036] In some embodiments, the thickness of the first transition section 21 and / or the second transition section 41 is transitioned from the steel plate 1 by a slope of 1:4 to 6mm~7.5mm. For example, the thickness of the first transition section 21 is transitioned from the steel plate 1 by a slope of 1:4 to 6mm~7.5mm, or the thickness of the second transition section 41 is transitioned from the steel plate 1 by a slope of 1:4 to 6mm~7.5mm, or the thickness of the first transition section 21 and the second transition section 41 is respectively transitioned from the steel plate 1 by a slope of 1:4 to 6mm~7.5mm. Generally, the thickness of the steel plate 1 is 22mm~30mm, for example, 22mm, 23mm, 25mm, 29mm, 30mm, etc., wherein the thickness of the bend angle 3 is the thickness of the steel plate 1, and the radius of the circular arc inside the bend angle 3 is 1~2 times the thickness of the steel plate 1. The thickness of the steel material of the bottom plate 5 and the main cylinder 6 of the containment steel liner is about 6mm, and the thickness of the first transition section 21 and the second transition section 41 is transitioned to finally approach the thickness of the steel material of the bottom plate 5 and the main cylinder 6, preventing fault bulging.

[0037] Understandably, the minimum thickness of the first transition section 21 is 6mm~7.5mm, for example, 6mm, 7mm, 7.5mm, etc., and the thickness of the first straight section 22 is less than or equal to the minimum thickness of the first transition section 21, that is, the thickness of the first straight section 22 is 6mm~7.5mm, for example, 6mm, 7mm, 7.5mm, etc., and the thickness of the first straight section 22 is determined with reference to the minimum thickness of the first transition section 21. Similarly, the minimum thickness of the second transition section 41 is 6mm~7.5mm, for example, 6mm, 7mm, 7.5mm, etc., and the thickness of the second straight section 42 is less than or equal to the minimum thickness of the second transition section 41, that is, the thickness of the second straight section 42 is 6mm~7.5mm, for example, 6mm, 7mm, 7.5mm, etc., and the thickness of the second straight section 42 is determined with reference to the minimum thickness of the second transition section 41.

[0038] The manufacturing method of the containment steel liner reinforcing node of the utility model is as follows: the steel plate 1 is cut into a long strip, then bent into an L or V type steel by a bending machine, specifically 90°~160°, then the first straight edge 2 / second straight edge 4 is milled to the corresponding transition area first transition section 21 / second transition section 41 by a milling machine, then the steel plate 1 is rolled into the corresponding arc shape by a rolling arc equipment, then the bending area, that is, the bend angle 3, is subjected to stress relief heat treatment, and finally the steel plate 1 after being processed in multiple sections is welded into a ring shape with the head and tail connected. A containment steel liner reinforcing node can be manufactured. The specific method is as follows:

[0039] In the first step, the steel plate 1 is obtained according to the required arc radius, material length and bending equipment length of the reinforcing node of the corresponding position of the containment steel lining, the steel plate 1 is divided into several segments, and the segments are as long as possible to reduce the splicing welding of each segment. The steel plate 1 is cut into several long strip-shaped steel plates 1 by flame or plasma cutting, and a certain processing allowance is appropriately reserved in the width direction to ensure the size of the first straight edge 2 and the second straight edge 4 after bending.

[0040] In the second step, each segment of the steel plate 1 is bent along the length direction of the steel plate 1, so that the steel plate 1 is bent into an L or V-shaped steel, and a specific angle of 90°-160° is formed. The specific angle after bending is checked by using a sample plate, the angle deviation is controlled within ±3°, and the width of the first straight edge 2 and the second straight edge 4 is measured, and the width difference of the first straight edge 2 and the second straight edge 4 is not greater than 2 mm.

[0041] In the third step, the forming process is evaluated according to the thickness of the steel plate 1 after bending, the bending radius of the forming part and the heat treatment process. The process evaluation test piece needs to be 100% visually, 100% penetrant and 100% magnetic powder detection on the bending position of the steel plate 1, and the samples of the compression area and the tension area of the forming part are respectively taken for mechanical property test, metallographic test and hardness test, and the test results need to meet the performance requirements of the base material.

[0042] In the fourth step, the two ends of the steel plate 1 in the width direction are respectively cut, and the thickness of the two ends decreases from inside to outside. Specifically, the first straight edge 2 and the second straight edge 4 are respectively cut on the side towards the center of the circle, and the thickness of the first straight edge 2 and the second straight edge 4 decreases from the bending angle 3 to the outside. The thickness of the first transition section 21 and / or the second transition section 41 is gradually changed from the thickness of the steel plate 1 to 6mm-7.5mm according to a slope of 1:4.

[0043] In the fifth step, the first straight edge 2 and the second straight edge 4 are respectively milled to form a first straight edge section 22 and a second straight edge section 42 with a thickness of about 6mm, and the width of the first straight edge section 22 and the second straight edge section 42 is about 20mm, which is used for butt welding with the bottom plate 5 and / or the main cylinder 6.

[0044] In the sixth step, the material performance can be restored by stress relief heat treatment after the steel plate 1 is formed. The stress relief rated holding temperature is 575℃-625℃, and the holding time is not less than 6 hours; the heating and cooling rate at a temperature exceeding 400℃ should be as follows: the steel plate 1 with a nominal thickness t≤25mm, not more than 220℃ / h; the steel plate 1 with a nominal thickness t>25mm, according to 220 / t×25℃ / h, but not less than 55℃ / h; the temperature difference of any two points within 4.5m on the same equipment should not exceed 150℃.

[0045] Finally, the multi-section formed steel plate 1 is welded to a ring, and the weld is 100% visually, penetrates, vacuum, and ray detected.

[0046] In other embodiments, when the containment steel liner is made, the segmented steel plate 1 can also be spliced and welded with the bottom plate 5 and / or the main cylinder 6 first, and then the multi-section steel plate 1 is finally welded to a ring.

[0047] The technical effects brought by the utility model are as follows:

[0048] 1 The overall bending steel plate 1 structure is adopted, and the steel plate 1 is spliced into a ring to form a modularized and integrated containment steel liner reinforcing node, which is installed at positions A, B and C as shown in the drawings. Figure 1 The welding length is greatly reduced by 382 m, and the welding deformation of the containment steel liner reinforcing node is effectively controlled. At the same time, the workshop prefabrication and on-site construction of the containment steel liner reinforcing node can be realized in parallel, and the progress contribution is obvious.

[0049] 2 The containment steel liner reinforcing node of the utility model can be bent and prefabricated in the workshop, batch processing and production are realized, the production efficiency is high, the construction period is effectively shortened, the construction quality is easy to control, the generation of waste materials is reduced, the labor cost and on-site management cost are saved, and the production cost is reduced.

[0050] Through the implementation of the utility model, the following beneficial effects are achieved:

[0051] The containment steel liner reinforcing node of the utility model is directly transferred to the manufacturing site to serve as the reinforcing node of the containment steel liner after being spliced into a ring by the multi-section steel plate 1, each steel plate 1 is integrally formed into a specific angle bending mode in advance, the turning angle of the transition area of the containment steel liner is met, on-site angle adjustment is avoided, the deformation can be controlled and the quality of the reinforcing node is guaranteed, the workshop prefabrication and on-site construction are realized in parallel, and the construction quality and efficiency are improved.

[0052] The containment steel liner and the containment steel liner reinforcing node can be integrally formed into a specific angle bending mode in advance, the turning angle of the transition area of the containment steel liner is met, the containment steel liner reinforcing node is integrally welded and fixed with the bottom plate 5 or the main cylinder 6, the on-site welding construction amount and the dependence on welding technicians are reduced, the workshop prefabrication and on-site construction are realized in parallel, the construction period is shortened, and the construction quality and efficiency are improved.

[0053] It can be understood that the above embodiments only express the preferred embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application patent; it should be pointed out that for ordinary skilled in the art, the above embodiments or technical features can be freely combined without departing from the concept of the present application, and a number of modifications and improvements can be made, which belong to the protection scope of the present application, that is, the embodiments described in "in some embodiments" can be freely combined with any embodiment above and below; therefore, any equivalent transformation and modification within the scope of the present application claims should belong to the scope of the present application claims.

Claims

1. A containment steel liner characterized by, The reactor includes a bottom plate (5), a plurality of main cylinder bodies (6), and a plurality of containment steel lining reinforcing nodes; The containment steel lining reinforcing node includes a plurality of steel plates (1), each of which is curved along the arc length direction and has a specific angle, each of which is curved along the width direction and has an arc shape, and the bending radii of the plurality of steel plates (1) are the same; the plurality of steel plates (1) are spliced into a ring; The axial ends of the containment steel lining reinforcing node are respectively welded and fixed with the bottom plate (5) and the main cylinder body (6), or the axial ends of the containment steel lining reinforcing node are respectively welded and fixed with the adjacent two main cylinder bodies (6).

2. The containment vessel steel liner of claim 1, wherein, The steel plate (1) includes a first straight edge (2), a bend angle (3), and a second straight edge (4), the widths of the first straight edge (2) and the second straight edge (4) are similar or equal and are respectively arranged at both ends of the bend angle (3), and the bend angle (3) is arc-shaped.

3. The containment vessel steel liner of claim 2, wherein, The width difference between the first straight edge (2) and the second straight edge (4) is not greater than 2mm.

4. The containment vessel steel liner of claim 2, wherein, The thicknesses of the first straight edge (2) and the second straight edge (4) decrease outwardly from the bend angle (3) respectively.

5. The containment vessel steel liner of claim 4, wherein, The first straight edge (2) includes a first transition section (21) and a first straight edge section (22), the first transition section (21) is arranged between the bend angle (3) and the first straight edge section (22), the thickness of the first transition section (21) decreases from the bend angle (3) to the first straight edge section (22), and the thickness of the first straight edge section (22) is less than or equal to the minimum thickness of the first transition section (21); The second straight edge (4) includes a second transition section (41) and a second straight edge section (42), the second transition section (41) is arranged between the bend angle (3) and the second straight edge section (42), the thickness of the second transition section (41) decreases from the bend angle (3) to the second straight edge section (42), and the thickness of the second straight edge section (42) is less than or equal to the minimum thickness of the second transition section (41).

6. The containment vessel steel liner of claim 5, wherein, The thickness of the first transition section (21) and / or the second transition section (41) transitions from 1:4 to 6mm~7.5mm according to the slope of the steel plate (1).

7. The containment vessel steel liner of claim 2, wherein, The arc radius of the inside of the bend angle (3) is 1~2 times the thickness of the steel plate (1).

8. The containment vessel steel liner of any one of claims 1 to 7, wherein, The arc lengths of any two steel plates (1) are the same or different, and the adjacent two steel plates (1) are welded and fixed.

9. The containment vessel steel liner of any one of claims 1 to 7, wherein, The specific angle is 90°~160°, and the thickness of the steel plate (1) is 22mm~30mm.

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