Splicing method for containment cylinder and accessory plate of nuclear power station

Abstract

The invention relates to the technical field of nuclear power station installation, in particular to a nuclear power station containment cylinder and accessory plate splicing method which comprises the following steps: S1, a cylinder plate is placed on a positioning tool, and the actual center line of the cylinder plate is released; s2, mounting an accessory plate, namely, releasing corresponding longitudinal and transverse positioning lines of the accessory plate on the cylinder plate; a corresponding accessory plate is mounted on the cylinder body plate; the position of the actual center line of the accessory plate and the barrel plate after installation is completed is detected; all accessory plates on the cylinder body plate are mounted to form a cylinder body unit; s3, detecting the mounting quality of the cylinder unit; s4, completing the installation of each cylinder unit according to the steps S1 to S3, hoisting each cylinder unit in place, and splicing to form a containment cylinder; and S5, detecting the installation quality of the containment cylinder. The method has the advantages of being high in installation efficiency, convenient and fast in installation process, low in construction cost and the like, and safety risks generated by high-place operation are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant installation, in particular to an assembling method of a containment shell body and accessory plates of a nuclear power plant. Background Art

[0002] During the construction of nuclear power plants, the installation of steel containment accessory plates will be involved. During the construction of AP and CAP reactor nuclear power plants, the accessory plates are divided into several series according to their different functions. They are distributed on the inner and outer surfaces of the steel containment shell, the inner surface of the bottom head, the inner surface of the top head, the inner and outer stiffening rib surfaces, and the surface of the ring beam.

[0003] At present, the installation of the above-mentioned accessory plate is carried out after the steel containment shell is assembled. When installing and inspecting the accessory plate, it is mainly positioned with the help of a total station. Before installation, the azimuth and elevation of the accessory plate are first measured by the total station measurement method, and then the azimuth line and elevation line are marked according to the measurement results to determine the installation position of the accessory plate. Then, the accessory plate is installed and fixed by welding, and finally the installation position of the installed accessory plate is inspected again with the help of the total station.

[0004] However, when the above installation method is actually applied, there are the following problems: first, the assembly of the accessory plates must wait until the steel containment is fully assembled before it can be started, which significantly delays the start time of the accessory plate installation; second, due to the large number and wide distribution of the accessory plates, the use of a total station for long-term positioning and measurement is not only time-consuming and labor-intensive, but also in order to ensure the measurement accuracy, other construction activities that may interfere with the measurement must be temporarily suspended, which undoubtedly affects the overall construction progress; finally, because the number of accessory plates is large and their distribution is wide, scaffolding needs to be set up at the installation location of the steel containment accessory plates for installation, which undoubtedly increases the complexity and potential risks of the construction, and also puts higher requirements on the safety management of the construction site. Summary of the invention

[0005] The purpose of the present invention is to provide a method for assembling a nuclear power plant containment shell and accessory plates, so as to solve the technical problems of difficult installation, time-consuming and labor-intensive, and low efficiency in the prior art when assembling a nuclear power plant containment shell.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for assembling a containment shell and accessory plates of a nuclear power plant comprises the following steps:

[0008] S1: placing the cylinder plate on a positioning fixture and releasing the actual center line of the cylinder plate;

[0009] S2: Install the accessory plate, including:

[0010] Laying out the longitudinal and transverse positioning lines of the corresponding accessory plates on the cylinder plate;

[0011] Installing corresponding accessory plates on the cylinder plate;

[0012] Detecting the relative position of the installed accessory plate and the actual center line;

[0013] All accessory plates on the cylinder plate are installed to form a cylinder unit;

[0014] S3: Detecting the installation quality of the cylinder unit;

[0015] S4: Complete the installation of each cylinder unit according to steps S1 to S3, hoist each cylinder unit into place and splice them to form a containment cylinder;

[0016] S5: Check the installation quality of the containment shell.

[0017] Furthermore, the step of placing the cylinder plate on the positioning fixture includes:

[0018] The positioning tooling includes sleepers, on which are provided arc grooves adapted to the curvature of the cylinder plate. The cylinder plate is placed on the arc grooves according to the actual coordinate system on site to ensure that the lowest point of the cylinder plate does not touch the ground and maintains its original arc shape.

[0019] Furthermore, the step of placing the cylinder plate on the positioning fixture also includes:

[0020] The positioning tool also includes a central pillar, four pull rods and four positioning blocks. The four positioning blocks are respectively clamped to the four corners of the cylinder plate, one end of the four pull rods corresponds to each other and is hinged to the four positioning blocks, the other ends of the four pull rods are connected to one end of the central pillar, and the other end of the central pillar is abutted against the center position of the cylinder plate.

[0021] Furthermore, a magnet is provided at the other end of the central pillar, and the central pillar is fixed at the center position of the cylinder plate by adsorption of the magnet;

[0022] And / or, the pull rod includes a first rod body and a second rod body slidably connected along the axial direction of the pull rod.

[0023] Furthermore, the step of releasing the actual center line of the cylinder plate comprises:

[0024] Measure the actual arc length of the middle and lower parts of the cylinder plate, take the center points of the actual arc length of the middle and lower parts of the cylinder plate and connect them into a line;

[0025] Measure the heights of the left and right sides of the cylinder plate, take the center points of the heights of the left and right sides of the cylinder plate and connect them into a line.

[0026] Furthermore, the step of laying out the longitudinal and transverse positioning lines of the corresponding accessory plates on the cylinder plate comprises:

[0027] Determine the horizontal position of the horizontal lines in the corresponding longitudinal and transverse positioning lines according to the radius of the cylinder plate, the starting angle of the cylinder plate and the design angle of the corresponding accessory plate;

[0028] Determine the height position of the corresponding transverse line according to the design elevation of the cylinder plate and the design elevation of the corresponding accessory plate;

[0029] A line perpendicular to the corresponding transverse line and passing through the center point of the corresponding transverse line forms a longitudinal line in the corresponding longitudinal and transverse positioning lines.

[0030] Furthermore, the step of installing a corresponding accessory plate on the cylinder plate includes:

[0031] Draw the vertical and horizontal positioning lines of the accessory plate on one side of the accessory plate close to the center of the cylinder plate;

[0032] Place the accessory plate at the corresponding position on the cylinder plate, and adjust the angle of the accessory plate so that the vertical and horizontal positioning lines on the accessory plate are aligned with the corresponding vertical and horizontal positioning lines on the cylinder plate.

[0033] Furthermore, the step S4 comprises:

[0034] Before lifting, mark the upper and lower openings and plate numbers on the cylinder plate, lift them into place and weld them in sequence according to the plate numbers.

[0035] Furthermore, the step S4 further includes:

[0036] When the welding shrinkage is large and causes the center position of the cylinder plate to shift, add a fixed connecting plate to control the shrinkage between welds or weld a diagonal puller plate to fix it.

[0037] Furthermore, the step S3 includes: performing nondestructive testing and dimensional testing on the welded cylinder unit;

[0038] The step S5 includes: performing nondestructive testing and dimensional testing on the welded containment shell.

[0039] Beneficial effects of the present invention:

[0040] The present invention provides a method for assembling a containment shell cylinder and accessory plates of a nuclear power plant, the method comprising the following steps: S1: placing the cylinder plate on a positioning tool to release the actual center line of the cylinder plate;

[0041] S2: installing accessory plates, including: laying out corresponding longitudinal and transverse positioning lines of the accessory plates on the cylinder plate; installing corresponding accessory plates on the cylinder plate; detecting the position of the accessory plates after installation and the actual center line of the cylinder plate; installing all the accessory plates on the cylinder plate to form a cylinder unit; S3: detecting the installation quality of the cylinder unit; S4: completing the installation of each cylinder unit according to steps S1 to S3, hoisting each cylinder unit into place and splicing them to form a containment cylinder; S5: detecting the installation quality of the containment cylinder.

[0042] Compared with the method of installing the accessory plate on the containment cylinder after the assembly is completed, the method provided by the present application has the following advantages: first, the cylinder plate and the accessory plate of the steel containment can be processed and produced in parallel, and the cylinder plate and the accessory plate can be assembled on the ground after passing the acceptance inspection, which makes the installation efficiency higher and the installation process more convenient and quick; second, it reduces the use of total stations and the erection of scaffolding, thereby reducing construction costs; third, it reduces the safety risks caused by working at heights; fourth, it reduces the cross-construction caused by the installation of accessory plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic diagram of laying out the actual center line on the cylinder plate in the method provided by an embodiment of the present invention;

[0045] Figure 2 A design diagram of a cross section of a containment shell in the method provided by an embodiment of the present invention;

[0046] Figure 3 A schematic diagram of laying out the vertical and horizontal positioning lines on the cylinder plate in the method provided by an embodiment of the present invention;

[0047] Figure 4 A schematic diagram of installing an accessory board in the method provided by an embodiment of the present invention;

[0048] Figure 5 A schematic diagram of the structure of a cylinder unit installed in the method provided in an embodiment of the present invention;

[0049] Figure 6 A schematic diagram of a portion of the structure of the containment shell after installation in the method provided in an embodiment of the present invention;

[0050] Figure 7 A front view of a positioning tool in the method provided by an embodiment of the present invention;

[0051] Figure 8 A top view of a positioning tool in the method provided by an embodiment of the present invention;

[0052] Fig. 9 A partial solid diagram of the containment shell after installation in the method provided in an embodiment of the present invention.

[0053] icon:

[0054] 1- cylinder plate; 11- actual center line; 12- vertical and horizontal positioning lines; 121- horizontal line; 122- vertical line;

[0055] 2- Accessory board;

[0056] 100-sleeper; 200-center pillar; 300-pull rod; 301-first rod body; 302-second rod body; 400-positioning block; 500-magnet. DETAILED DESCRIPTION

[0057] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0058] The embodiment of the present invention provides a method for assembling a containment shell and an accessory plate of a nuclear power plant, referring to Figures 1 to 6 , the method comprises the following steps:

[0059] S1: placing the cylinder plate 1 on the positioning fixture and releasing the actual center line 11 of the cylinder plate 1;

[0060] S2: Install accessory board 2, including:

[0061] Lay out the longitudinal and transverse positioning lines 12 of the corresponding accessory plates 2 on the cylinder plate 1;

[0062] Install the corresponding accessory plate 2 on the cylinder plate 1;

[0063] Detecting the relative position of the actual center line 11 of the accessory plate 2 and the cylinder plate 1 after installation;

[0064] According to the above steps, all the accessory plates 2 are installed on the cylinder plate 1 to form a cylinder unit;

[0065] S3: Check the installation quality of the cylinder unit (including checking the position of each accessory plate 2, the quality of the weld, and the paint condition of the cylinder plate 1 and the accessory plate 2, etc.);

[0066] S4: Complete the installation of each cylinder unit according to steps S1 to S3, hoist each cylinder unit into place and splice them to form a containment cylinder;

[0067] S5: Check the installation quality of the containment shell (including checking the position of each shell unit, weld quality, paint condition, etc.).

[0068] According to the assembly method of the nuclear power plant containment cylinder and accessory plates provided in this embodiment, the containment cylinder is divided into a plurality of cylinder units on the design drawing, and each cylinder unit includes a cylinder plate 1 and one or more accessory plates 2 arranged on the inner surface and / or outer surface of the cylinder plate 1. When assembling the containment cylinder, the cylinder units are first assembled on the ground, and then the cylinder units are hoisted in place and spliced ​​to realize the assembly of the containment cylinder as a whole.

[0069] When assembling a single cylinder unit, first use a special positioning tool to fix the cylinder plate 1 to ensure that the cylinder plate 1 will not shift or deform; then, place the actual center line 11 (such as Figure 1 As shown), the actual center line 11 is used as the reference line to calibrate the position of the accessory plate 2; then, the corresponding longitudinal and transverse positioning lines 12 of the accessory plate 2 are placed on the cylinder plate 1 (as shown in FIG. Figure 3 As shown), the corresponding accessory plate 2 is positioned and installed using the longitudinal and transverse positioning lines 12 (as shown Figure 4 As shown); after each accessory plate 2 is installed, the relative position of the accessory plate 2 and the actual center line 11 of the cylinder plate 1 is detected to calibrate the position of the accessory plate 2 after installation to ensure that the installation position of the accessory plate 2 is accurate; all the accessory plates 2 on the cylinder plate 1 are installed according to the above method to form a cylinder unit.

[0070] It should be noted that the accessory plate 2 can be installed on the outer surface or the inner surface of the cylinder plate 1. The number and position of the accessory plate 2 are adjusted according to the use requirements and are not limited here.

[0071] Compared with the method of installing the accessory plate 2 on the containment cylinder after assembly, the method provided by the present application has the following advantages: first, the cylinder plate 1 and the accessory plate 2 of the steel containment can be processed and produced in parallel, and the cylinder plate 1 and the accessory plate 2 can be assembled on the ground after passing the acceptance inspection, which makes the installation efficiency higher and the installation process more convenient and quicker; second, the use of total stations and scaffolding erection are reduced, thereby reducing construction costs; third, the safety risks caused by working at heights are reduced; fourth, the cross-construction caused by the installation of the accessory plate 2 is reduced, making the construction process more convenient and quick, and reducing labor costs.

[0072] Furthermore, the step S1 further includes: laying out an elevation reference line on the cylinder plate 1. Specifically, a point is drawn every 3° from 0° for every set arc length (for example, every 100 mm) upward from the lower opening of the cylinder plate 1, and the elevations of multiple points (for example, 120 points) are measured respectively, and the average value is calculated to form the elevation reference line. The relative position of each installed accessory plate 2 and the elevation reference line on the cylinder plate 1 is detected to further ensure that the installation position of the accessory plate 2 is accurate.

[0073] Based on the above assembly method, step S4 also includes: during or after the splicing of each cylinder unit, measuring the relative distance between the elevation reference line on the cylinder plate 1 and the lower slope of the cylinder plate 1 to ensure that the height position of each cylinder unit is accurate.

[0074] Reference Figure 7 and Figure 8 The present application provides a positioning fixture for fixing the cylinder plate 1, the positioning fixture includes a sleeper 100, and the sleeper 100 is provided with an arc groove adapted to the curvature of the cylinder plate 1. Based on the above positioning fixture, in step S1, the step: placing the cylinder plate 1 on the positioning fixture includes: placing the cylinder plate 1 on the arc groove of the sleeper 100 according to the actual coordinate system on site, ensuring that the lowest point of the cylinder plate 1 does not touch the ground and keeps its original arc shape. Figure 7 As shown, the sleepers 100 can support the cylinder plate 1 to prevent the cylinder plate 1 from deforming.

[0075] On the basis of the above structure, the number of the sleepers 100 can be one or more; when the number of the sleepers 100 is more than one, the sleepers 100 are spaced apart along the height direction of the cylinder plate 1. The height direction of the cylinder plate 1 in this embodiment refers to the height direction of the cylinder plate 1 after assembly, rather than the height direction of the cylinder plate 1 on the positioning tool.

[0076] Furthermore, the positioning tool further includes a central pillar 200, four pull rods 300 and four positioning blocks 400, wherein:

[0077] The four positioning blocks 400 are used to be respectively clamped on the four corners of the cylinder plate 1;

[0078] One end of the four pull rods 300 corresponds to and is hinged to the four positioning blocks 400, and the other ends of the four pull rods 300 are connected to one end of the central pillar 200;

[0079] The other end of the central support 200 (ie, the end away from the tie rod 300 ) is used to abut against the center position of the cylinder plate 1 .

[0080] Based on the above positioning fixture, in step S1, the step: placing the cylinder plate 1 on the positioning fixture also includes: respectively clamping four positioning blocks 400 to the four corners of the cylinder plate 1, corresponding one end of four tie rods 300 to the four positioning blocks 400, connecting the other ends of the four tie rods 300 to one end of the central pillar 200, and abutting the other end of the central pillar 200 against the center position of the cylinder plate 1. Figure 7 and Figure 8 As shown, under the support of the central pillar 200, the four tie rods 300 can apply inward pulling force to the four corners of the cylinder plate 1, thereby further ensuring that the cylinder plate 1 will not be deformed.

[0081] It should be noted that the positioning tool may include only the sleeper 100, or only the center pillar 200, four tie rods 300 and four positioning blocks 400, or may include the sleeper 100, the center pillar 200, four tie rods 300 and four positioning blocks 400 at the same time, without limitation herein.

[0082] On the basis of the above structure, a magnet 500 is provided at the other end of the central pillar 200 (i.e., the end away from the pull rod 300), and the central pillar 200 is fixed at the center position of the cylinder plate 1 by adsorption of the magnet 500;

[0083] And / or, the pull rod 300 includes a first rod body 301 and a second rod body 302 slidably connected along the axial direction of the pull rod 300 .

[0084] In this embodiment, the other end of the central pillar 200 (i.e., the end away from the pull rod 300) is fixed with a magnet 500, and the central pillar 200 is fixed to the center position of the cylinder plate 1 by adsorption of the magnet 500. The pull rod 300 includes a first rod body 301 and a second rod body 302, wherein: one end of the first rod body 301 is connected to one end of the central pillar 200 by a bolt or a pin, and the other end of the first rod body 301 is provided with an external thread; one end of the second rod body 302 is provided with a threaded hole, and one end of the first rod body 301 with an external thread is screwed into the threaded hole, and the other end of the second rod body 302 is hinged to the corresponding positioning block 400 through a pin. The positioning block 400 is provided with a U-shaped groove, and the corners of the cylinder plate 1 are inserted into the U-shaped groove.

[0085] In the above structure, the central pillar 200 is fixed to the center of the cylinder plate 1 by the magnet 500, so that the central pillar 200 is not easily displaced or shaken; the pull rod 300 is a retractable structure, so that the length of the pull rod 300 can be adjusted according to the curvature of the cylinder plate 1. The above structure ensures that the cylinder plate 1 will not be deformed or displaced during the installation process, thereby ensuring the installation accuracy of the accessory plate 2.

[0086] The above structure is a connection form of the pull rod 300. In other embodiments, the pull rod 300 can also be connected in a form in which both ends are hooked on the positioning block 400 and the central pillar 200 respectively.

[0087] Continue to refer to Figure 1 In step S1, the step of releasing the actual center line 11 of the cylinder plate 1 comprises:

[0088] Measure the actual arc length of the top, middle and bottom of the cylinder plate 1, take the center points of the actual arc length of the top, middle and bottom of the cylinder plate 1 and connect them into a line;

[0089] Measure the height of the left and right sides of the cylinder plate 1 (referring to the height of the cylinder plate 1 after assembly), take the center points of the height of the left and right sides of the cylinder plate 1 and connect them into a line.

[0090] In this embodiment, the actual center line 11 of the cylinder plate 1 before assembly is laid out on the ground. Specifically, after the cylinder plate 1 is transported to the site according to the actual coordinate system on site, a crane or a crane is used to place the cylinder plate 1 on a positioning fixture, which can prevent the lowest point of the cylinder plate 1 from touching the ground, ensuring that the cylinder plate 1 maintains its original arc shape, thereby avoiding deformation of the cylinder plate 1. After the cylinder plate 1 is placed on the positioning fixture, its appearance and dimensions are checked to ensure that there is no abnormality in the cylinder plate 1, and then the actual inner and outer arc lengths of the top, middle and bottom of each cylinder plate 1 and the heights of the left and right sides are measured.

[0091] It should be noted that the actual arc lengths of the top, middle and bottom of the cylinder plate 1 can be used as key check items during acceptance of the cylinder plate 1 to avoid affecting installation due to manufacturing errors.

[0092] Continue to refer to Figures 2 to 4 In step S2, the step of laying out the longitudinal and transverse positioning lines 12 of the corresponding accessory plate 2 on the cylinder plate 1 comprises:

[0093] According to the radius of the cylinder plate 1, the starting angle of the cylinder plate 1 and the design angle of the corresponding attachment plate 2, the horizontal position of the horizontal line 121 in the corresponding vertical and horizontal positioning line 12 is determined;

[0094] According to the design elevation of the cylinder plate 1 and the design elevation of the corresponding accessory plate, the height position of the corresponding transverse line 121 is determined;

[0095] A dashed line perpendicular to the corresponding transverse line 121 and passing through the center point of the corresponding transverse line 121 forms a longitudinal line 122 in the corresponding longitudinal and transverse positioning line.

[0096] Optionally, the longitudinal and transverse positioning lines 12 are internally controlled to have a deviation of 2 mm when laying out the lines.

[0097] Furthermore, the step of determining the horizontal position of the transverse line 121 in the corresponding longitudinal and transverse positioning line 12 according to the radius of the cylinder plate 1, the starting angle of the cylinder plate 1 and the design angle of the corresponding accessory plate 2 comprises:

[0098] The length of the corresponding transverse line 121 is calculated from the radius of the cylinder plate 1;

[0099] The starting point of the corresponding transverse line 121 is determined by the starting angle of the cylinder plate 1 and the design angle of the corresponding attachment plate 2 .

[0100] Specifically, the calculation formula of the arc length is: L = n × π × r / 180, where n is the degree of the center angle of the circle, r is the radius, and L is the arc length of the center angle of the circle. Substituting the radius of the cylinder plate 1 into the calculation formula, the unit arc length of the cylinder plate 1 (i.e., the arc length corresponding to 1°) can be calculated; in this embodiment, the unit arc length of the cylinder plate 1 is the length of the transverse line 121 in the vertical and horizontal positioning line 12 (the length of the transverse line 121 can be adaptively adjusted according to the length of the actual installed accessory plate 2, and the length of the transverse line 121 should be equal to or slightly greater than the length of the accessory plate 2). The starting point of the transverse line 121 is determined by the starting angle of the cylinder plate 1 and the corresponding design angle of the accessory plate 2. The starting point and length of the transverse line 121 are clarified, that is, the horizontal position of the transverse line 121 is determined.

[0101] For example, refer to Figure 2 , on the design drawing of a cross section of the containment cylinder (specifically, a cross section of one of the plate layers of the containment cylinder), the multiple cylinder plates 1 constituting the cross section are named in sequence along the circumference of the cross section as the first cylinder plate, the second cylinder plate...the n-1th cylinder plate and the nth cylinder plate, wherein the line connecting the center of the cross section and the bordering edges of the first cylinder plate and the nth cylinder plate is the 0° line; with the 0° line as a reference, the 0° line, the 90° line, the 180° line and the 270° line are marked. Figure 2 In the illustrated embodiment, the center angle of each cylinder plate 1 is 30°, the starting angle of the first cylinder plate is 0°, the starting angle of the second cylinder plate is 30°, the starting angle of the third cylinder plate is 60°, and so on, the starting angle of the nth cylinder plate is (n-1)*30°.

[0102] Based on the above structure, it is assumed that: the radius of the cylinder is 19.812m, the design angle of the accessory plate 2 to be installed is 59°, and the design elevation of the accessory plate 2 to be installed is 100m, then:

[0103] The arc length calculation formula can be used to calculate that the arc length of the corresponding transverse line 121 (i.e., the unit arc length of the cylinder plate 1) is 346 mm;

[0104] From the design elevation of the accessory board 2 to be installed, it can be concluded that the accessory board 2 is located at a certain board layer;

[0105] The quotient obtained by dividing 59° by 30° and adding 1, the accessory plate 2 to be installed is located in the second cylinder plate in the plate layer;

[0106] According to the design drawings, the design elevation of the lower opening of the second cylinder plate is 99.88m, so the height position of the horizontal line 121 is 120mm upward from the lower opening of the second cylinder plate;

[0107] The starting angle of the second cylinder plate is 30°, and the corresponding central angle between the starting point of the transverse line 121 and the starting point of the second cylinder plate is 29°;

[0108] Reference Figure 3 For the convenience of marking, take the groove edge corresponding to the end point of the second cylinder plate as the starting point, and draw a horizontal arc with a length of 346 mm, which is the horizontal line 121 corresponding to the accessory plate 2; draw a line perpendicular to the horizontal line 121 and passing through the center point of the horizontal line 121 to form the corresponding longitudinal line 122.

[0109] For another example, assuming that the radius of the cylinder is 19.812 m, the design angle of the accessory plate 2 to be installed is 70°, and the design elevation of the accessory plate 2 to be installed is 105 m, then:

[0110] According to the arc length calculation formula, the arc length of the corresponding horizontal line 121 can be calculated to be 346 mm;

[0111] From the design elevation of the accessory board 2 to be installed, it can be concluded that the accessory board 2 is located at a certain board layer;

[0112] The quotient obtained by dividing 70° by 30° and adding 1, the accessory plate 2 to be installed is located in the third cylinder plate in the plate layer;

[0113] According to the design drawings, the design elevation of the lower opening of the third cylinder plate is 104.8m, so the height position of the horizontal line 121 corresponding to the accessory plate 2 is 200mm upward from the lower opening of the third cylinder plate;

[0114] The starting angle of the third cylinder plate is 60°, and the corresponding central angle between the starting point of the transverse line 121 and the starting point of the third cylinder plate is 10°;

[0115] The arc length calculation formula can be used to calculate that the arc length of the arc with a center angle of 10° is 3460 mm. Taking the groove edge corresponding to the starting point of the third cylinder plate as the starting point, a line with an arc length of 3460 mm is horizontally drawn on the third cylinder plate. The end point of the line is the starting point of the corresponding horizontal line 121.

[0116] Next, draw an arc with a length of 346 mm horizontally with the end point of the line as the starting point, which is the horizontal line 121 corresponding to the accessory plate 2; draw a line perpendicular to the horizontal line 121 and passing through the center point of the horizontal line 121 to form a corresponding longitudinal line 122.

[0117] As described above, the method provided in this embodiment is used to determine the height position of the transverse line 121 corresponding to the accessory plate 2 according to the design elevation of the cylinder plate 1 and the design elevation of the corresponding accessory plate 2. The length of the transverse line 121 can be calculated from the radius of the cylinder plate 1; the starting point of the transverse line 121 corresponding to the accessory plate 2 can be determined according to the starting angle of the cylinder plate 1 and the design angle of the corresponding accessory plate 2; the length and starting point of the transverse line 121 are determined, that is, the horizontal position of the transverse line 121 is determined. After the height position and horizontal position of the transverse line 121 corresponding to the accessory plate 2 are determined, the vertical and horizontal positioning lines 12 corresponding to the accessory plate 2 can be placed on the cylinder plate 1.

[0118] Reference Figure 4 In step S2, the step of installing the corresponding accessory plate 2 on the cylinder plate 1 includes:

[0119] Draw the vertical and horizontal positioning lines of the accessory plate 2 on one side of the accessory plate 2 close to the center of the cylinder plate 1;

[0120] Place the accessory plate 2 at the corresponding position on the cylinder plate 1, and adjust the angle of the accessory plate 2 so that the longitudinal and transverse positioning lines on the accessory plate 2 are aligned with the corresponding longitudinal and transverse positioning lines 12 on the cylinder plate 1.

[0121] In this embodiment, before welding the accessory plate 2, the longitudinal and transverse positioning lines of the accessory plate 2 are drawn on the side close to the center of the cylinder. During the positioning welding, ensure that the longitudinal and transverse positioning lines of the accessory plate 2 are aligned with the longitudinal and transverse positioning lines 12 on the cylinder plate 1 to reduce the installation error. For accessory plates 2 of the same size, they should be installed in the designated positions according to the numbers on the drawings and should not be exchanged. During welding, the welds with larger deformation are generally welded first. The welds of the accessory plate 2 are numbered according to the design drawings.

[0122] After the installation, the cylinder unit is Figure 5shown.

[0123] Furthermore, the step S3 includes: performing nondestructive testing and dimensional testing on the welded cylinder unit.

[0124] In this embodiment, after the cylinder unit is welded, visual inspection and non-destructive testing of the weld are carried out, wherein: the visual inspection includes checking the center position of the accessory plate 2, specifically including checking whether the longitudinal and transverse positioning lines of the accessory plate 2 are horizontal or vertical, to ensure that the center position of the accessory plate 2 meets the requirements of the drawing; non-destructive testing of the weld can be carried out by liquid penetration testing to ensure that the weld of the accessory plate 2 is free of defects such as cracks, pores, slag inclusions, and incomplete penetration.

[0125] Furthermore, the step S4 comprises:

[0126] Before hoisting, mark the upper and lower openings and plate numbers on the cylinder plate 1, hoist them into place and weld them in sequence according to the plate numbers;

[0127] When the welding shrinkage is large and causes the center position of the cylinder plate 1 to shift, a fixed connecting plate is added to control the shrinkage between the welds or a welding inclined puller plate is used for fixing.

[0128] In this embodiment, before hoisting the cylinder plate 1, mark the upper and lower openings on the cylinder plate 1, and mark the plate number to avoid errors in hoisting. When splicing the cylinder plate 1, control the angle of the center point of the cylinder plate 1 to be within the required range, and re-measure the center point of the accessory plate 2 on the cylinder plate 1 before spot welding the cylinder plate 1; if the welding shrinkage is large and causes the center position of the cylinder plate 1 to shift, add a fixed connecting plate in time to control the shrinkage between the welds or weld the inclined puller plate to fix it. After the installation of the partial containment cylinder, Figure 6 shown.

[0129] Furthermore, the step S5 includes: performing nondestructive testing and dimensional inspection on the welded containment shell.

[0130] In this embodiment, after the cylinder plate 1 is spliced ​​in place, the longitudinal weld of the cylinder plate 1 is first welded and non-destructively tested, and then the circumferential weld of the cylinder plate 1 is welded and non-destructively tested. It should be noted that the non-destructive testing of the circumferential weld and longitudinal weld of the cylinder plate 1 is not controlled by logical relationships. The dimensional inspection after the installation of the containment cylinder includes checking the angle and elevation of the center point of the accessory plate 2, and checking the angle, diameter, and verticality of the cylinder plate 1.

[0131] The following takes the installation of the steel containment cylinder and the accessory plate 2 on the inner surface in an AP1000 reactor-type nuclear power plant as an example to introduce the technical solution of the present invention in detail.

[0132] like Fig. 9As shown, the containment cylinder in the AP reactor type nuclear power plant includes multiple circles of annular cylinders connected in sequence from bottom to top, and the multiple circles of annular cylinders are sequentially a bottom head, a cylinder ring, a cylinder ring, a cylinder ring, a cylinder ring and a top head; wherein each circle of annular cylinder is assembled from bottom to top by 3-5 layers of plate parts, and each layer of plate parts includes 12 cylinder plates 1 spliced ​​end to end into a closed loop, and among the 12 cylinder plates 1, 11 are standard plates and 1 is an adjustment plate.

[0133] The assembly method of the containment shell includes:

[0134] Before assembly, all accessory plates 2 involved in the AP type steel containment cylinder are sorted out according to the number of layers of the cylinder plate 1 to form a material list of the containment cylinder as shown in Table 1; the material list of the containment cylinder includes several tables (the number of circles of the cylinder plate 1 is the same as the number of tables), and the tables are provided with the plate number of the accessory plate 2 welded on the cylinder plate 1, the drawing number, the own number of the accessory plate 2, the design elevation and design angle of the accessory plate 2, the actual elevation and actual angle of the accessory plate 2 after conversion, etc.

[0135] Table 1 Material list of containment shell

[0136]

[0137] According to the material list of the containment shell, assemble each shell unit in sequence; the assembling steps of a single shell unit include: first release the actual center line 11 of the shell plate 1, then release the longitudinal and transverse positioning lines 12 of the corresponding accessory plate 2 on the shell plate 1, and then install the corresponding accessory plate 2 at the position of the longitudinal and transverse positioning lines 12, and detect the relative position of the accessory plate 2 and the actual center line 11 after installation to ensure that the position of the accessory plate 2 is accurate; all the accessory plates 2 on the shell plate 1 are installed to form a shell unit.

[0138] After all cylinder units are assembled, they are hoisted into place and spliced ​​to form the containment cylinder; then the installation quality of the containment cylinder is checked to ensure that the final construction quality meets the requirements.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for assembling a containment shell and accessory plates of a nuclear power plant, characterized in that: The following steps are involved: S1: placing the cylinder plate (1) on a positioning fixture and releasing the actual center line (11) of the cylinder plate (1); S2: Install the accessory plate (2), including: Laying out longitudinal and transverse positioning lines (12) of corresponding accessory plates (2) on the cylinder plate (1); Installing a corresponding accessory plate (2) on the cylinder plate (1); Detecting the relative position of the installed accessory plate (2) and the actual center line (11); All accessory plates (2) are installed on the cylinder plate (1) to form a cylinder unit; S3: Detecting the installation quality of the cylinder unit; S4: Complete the installation of each cylinder unit according to steps S1 to S3, hoist each cylinder unit into place and splice them to form a containment cylinder; S5: Check the installation quality of the containment shell.

2. The method for assembling a nuclear power plant containment shell and accessory plates according to claim 1, characterized in that: The step of placing the cylinder plate (1) on a positioning fixture comprises: The positioning tooling comprises a sleeper (100), on which an arc groove matching the curvature of the cylinder plate (1) is provided. The cylinder plate (1) is placed on the arc groove according to an actual coordinate system on site, ensuring that the lowest point of the cylinder plate (1) does not touch the ground and keeps its original arc shape.

3. The method for assembling a nuclear power plant containment shell and accessory plates according to claim 1, characterized in that: The step of placing the cylinder plate (1) on a positioning fixture also includes: The positioning tool also includes a central pillar (200), four tie rods (300) and four positioning blocks (400). The four positioning blocks (400) are respectively connected to the four corners of the cylinder plate (1), one end of the four tie rods (300) corresponds to each other and is hinged to the four positioning blocks (400), the other ends of the four tie rods (300) are connected to one end of the central pillar (200), and the other end of the central pillar (200) is abutted against the center position of the cylinder plate (1).

4. The method for assembling a nuclear power plant containment shell and accessory plates according to claim 3, characterized in that: The other end of the central pillar (200) is provided with a magnet (500), and the central pillar (200) is adsorbed and fixed at the center position of the cylinder plate (1) by the magnet (500); And / or, the pull rod (300) comprises a first rod body (301) and a second rod body (302) which are slidably connected along the axial direction of the pull rod (300).

5. The method for assembling a nuclear power plant containment shell and accessory plates according to claim 1, characterized in that: The step of releasing the actual center line of the cylinder plate (1) comprises: Measure the actual arc length of the top, middle and bottom of the cylinder plate (1), take the center points of the actual arc length of the top, middle and bottom of the cylinder plate (1) and connect them into a line; The heights of the left and right sides of the cylinder plate (1) are measured, and the center points of the heights of the left and right sides of the cylinder plate (1) are taken and connected into a line.

6. The method for assembling a nuclear power plant containment shell and accessory plates according to claim 1, characterized in that: The step of laying out the longitudinal and transverse positioning lines (12) of the corresponding accessory plates (2) on the cylinder plate (1) comprises: Determining the horizontal position of the transverse line (121) in the corresponding longitudinal and transverse positioning line (12) according to the radius of the cylinder plate (1), the starting angle of the cylinder plate (1) and the design angle of the corresponding accessory plate (2); Determine the height position of the corresponding transverse line (121) according to the design elevation of the cylinder plate (1) and the design elevation of the corresponding accessory plate (2); A dashed line perpendicular to the corresponding transverse line (121) and passing through the center point of the corresponding transverse line (121) forms a longitudinal line (122) in the corresponding longitudinal and transverse positioning line (12).

7. The method for assembling a nuclear power plant containment shell and accessory plates according to claim 1, characterized in that: The step of installing the corresponding accessory plate (2) on the cylinder plate (1) comprises: Draw the vertical and horizontal positioning lines of the accessory plate (2) on one side of the accessory plate (2) close to the center of the cylinder plate (1); The accessory plate (2) is placed at a corresponding position on the cylinder plate (1), and the angle of the accessory plate (2) is adjusted so that the longitudinal and transverse positioning lines on the accessory plate (2) are aligned with the corresponding longitudinal and transverse positioning lines (12) on the cylinder plate (1).

8. The method for assembling a nuclear power plant containment shell and accessory plates according to claim 1, characterized in that: The step S4 comprises: Before hoisting, mark the upper and lower openings and plate numbers on the cylinder plate (1), and hoist them into place and weld them in sequence according to the plate numbers.

9. The method for assembling a nuclear power plant containment shell and accessory plates according to claim 1, characterized in that: The step S4 further comprises: When the welding shrinkage is large and causes the center position of the cylinder plate (1) to shift, a fixed connecting plate is added to control the shrinkage between the welds or a diagonal puller plate is welded to fix it.

10. The method for assembling a nuclear power plant containment shell and accessory plates according to any one of claims 1 to 9, characterized in that: The step S3 comprises: performing nondestructive testing and dimensional testing on the welded cylinder unit; The step S5 includes: performing nondestructive testing and dimensional testing on the welded containment shell.

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