Embedded structures, installation methods and manufacturing methods for fusion device assembly

Abstract

This invention discloses a pre-embedded structure, installation method, and manufacturing method for fusion device assembly, belonging to the technical field of fusion device technology. In this pre-embedded structure for fusion device assembly, the front side of a first pre-embedded plate is used to contact the base plate of a bracket assembly; multiple shear-resistant components are welded and fixed to the back side of the first pre-embedded plate; multiple second pre-embedded plates are arranged on one side of the back side of the first pre-embedded plate and are spaced apart from it; multiple double-ended bolt assemblies each include a screw and nuts located at both ends of the screw, with the screws of the multiple double-ended bolt assemblies respectively passing through the first pre-embedded plate and the multiple second pre-embedded plates, and the nuts at both ends of each screw respectively located on one side of the front side of the first pre-embedded plate and one side of the back side of the second pre-embedded plate. The pre-embedded structure for fusion device assembly of this invention has strong stability and load-bearing capacity, strong shear resistance, and can reduce local pressure on the wall surface, facilitating the installation of the bracket assembly.

Description

Technical Field

[0001] This invention relates to the field of fusion device assembly technology, and in particular to a pre-embedded structure, installation method and manufacturing method for fusion device assembly. Background Technology

[0002] Nuclear fusion, also known as nuclear fusion reaction, fusion reaction, or thermonuclear reaction, involves fusion reactors that can reach heights of tens of meters and weigh hundreds of tons, making them enormous. The main unit of a fusion reactor is its core structure and main component, typically consisting of a vacuum chamber, magnet system, cryogenic cooling system, power system, and diagnostic system. To facilitate manufacturing and transportation, these devices or systems are usually divided into independent sections during the design phase. Each independent section is manufactured separately at the factory and then assembled and spliced ​​on-site to form the individual devices or systems.

[0003] like Figure 7 As shown, during the on-site assembly of the above-mentioned equipment or systems, due to the influence of multiple factors such as hoisting weight and installation accuracy, the construction is usually divided into two steps. The first step is to combine the vacuum chamber, magnet system, cryogenic cooling system, power supply system and diagnostic system into sub-module 100, i.e., "sector", in the pre-assembly stage in the pre-assembly hall. The second step is to connect the various "sectors" together in the installation pit to form the complete fusion device main unit.

[0004] Before connecting the various "sectors" within the installation pit, each "sector" needs to be temporarily supported, adjusted, and assembled using a central column system located at the center of the installation pit and a ring rail system installed on the corbel components on the surface of the installation pit walls. Only after completing the welding and mechanical connections between the various "sectors" can the "sector" components be lifted upwards to support the "sector".

[0005] The assembly of the fusion device's "sector" requires extremely high installation precision. The gap between some "sector" components must not exceed 0.3mm, and the connection methods often employ irreversible means such as welding and interference fits. This results in long processing times and extremely high processing costs for any quality defects. Each "sector" component weighs approximately 500 tons and has a non-homogeneous structure with its center of mass and center of volume not coinciding, making adjustment extremely difficult. The swaying caused by inertia during adjustment can generate significant impact loads on the overall structure. The manufacturing cycle of the fusion device's "sector" components is long, the manufacturing cost is high, and the equipment is extremely valuable. The installation pit for the fusion device's "sector" components is narrow, limiting the operating space for construction personnel.

[0006] The bracket pre-embedded structure 200, used to install the bracket assembly, bears most of the dynamic and static loads during the assembly of the "sector" assembly. The strength and stability of the bracket pre-embedded structure 200 have a significant impact on the safety of equipment and personnel during assembly, the final installation quality of the "sector" assembly, and even the final operating efficiency of the fusion device. If the strength and stability of the bracket pre-embedded structure are insufficient, it may indirectly cause collisions between "sector" assemblies, prevent the "sector" assembly from meeting the positional requirements, and consequently cause quality defects in welding or mechanical connections, affecting the operating efficiency of the fusion device. In severe cases, it may even cause the "sector" assembly to fall, resulting in extremely serious consequences such as personal injury or equipment damage. Summary of the Invention

[0007] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one object of this invention is to provide a pre-embedded structure for fusion device assembly that exhibits high stability and load-bearing capacity, strong shear resistance, reduces localized pressure on the wall surface, and facilitates the installation of bracket components.

[0008] An embedded structure for assembling a fusion device according to an embodiment of the present invention is used to be embedded in the foundation pit wall at equal intervals along the circumference, comprising:

[0009] The first embedded plate, the front side of which is used to contact the bottom plate of the bracket assembly;

[0010] Shear-resistant components, wherein there are multiple shear-resistant components, and the multiple shear-resistant components are welded and fixed to the back side of the first embedded plate;

[0011] The second embedded plate, there are multiple second embedded plates, and the multiple second embedded plates are arranged on one side of the back of the first embedded plate and have a gap between them;

[0012] A plurality of double-ended bolt assemblies are provided, each comprising a screw and nuts at both ends of the screw. The screws of the plurality of double-ended bolt assemblies pass horizontally through the first embedded plate and the plurality of second embedded plates respectively. The nuts at both ends of each screw are respectively located on the front side of the first embedded plate and the back side of the second embedded plate.

[0013] The installation method of the pre-embedded structure for fusion device assembly according to the first aspect of the present invention is as follows: First, a steel cage is used to support the first pre-embedded plate and a plurality of second pre-embedded plates, so that the first pre-embedded plate and the plurality of second pre-embedded plates are horizontally tensioned and pre-tightened under the cooperation of the corresponding double-headed bolt assemblies; then, concrete is poured to form a foundation pit wall, and the opposing surfaces of the first pre-embedded plate and the second pre-embedded plates are fixed to the two side surfaces of the foundation pit wall, thereby exposing the nuts at both ends of the first pre-embedded plate, the second pre-embedded plate, and each of the bolts; in this way, the double-headed bolt assembly provides a strong pre-tightening force to the pre-embedded structure for fusion device assembly, greatly enhancing the stability and load-bearing capacity of the entire pre-embedded structure for fusion device assembly, while the first pre-embedded plate and the... The second embedded plates each have a certain area, reducing the local pressure on the sidewalls of the foundation pit. Then, the nuts on each screw near the first embedded plate are removed, allowing one end of each screw near the first embedded plate to pass through the base plate. The nuts are then screwed onto the end of each screw near the first embedded plate to secure the base plate to the front of the first embedded plate. The bracket assembly is easy and quick to install. Finally, after the subsequent fusion device is assembled, the protruding parts of the multiple double-headed bolt assemblies exposed on both sides of the foundation pit wall are removed to avoid affecting the magnetic confinement state of the fusion device and to prevent some elements in the embedded metal structure from being activated and forming high-radiation-dose-rate isotopes with long decay periods or short decay periods, ensuring high safety.

[0014] The pre-embedded structure for fusion device assembly according to the first aspect of the present invention has the following advantages: On the one hand, by setting the first pre-embedded plate, a plurality of second pre-embedded plates, and a plurality of double-headed bolt assemblies, a strong pre-tightening force can be provided to the pre-embedded structure for fusion device assembly, ensuring the stability and load-bearing capacity of the pre-embedded structure for fusion device assembly, while having a high load-bearing capacity margin; on the other hand, by setting a plurality of shear-resistant members on the back of the first pre-embedded plate, the overall shear resistance of the pre-embedded structure for fusion device assembly can be enhanced, increasing the shear load-bearing capacity margin; furthermore, the bracket assembly can be easily installed by the first pre-embedded plate and the plurality of double-headed bolt assemblies; in addition, the first pre-embedded plate and the plurality of second pre-embedded plates all have a certain area, reducing the local pressure on the wall surface.

[0015] In some embodiments, the thickness of the first embedded plate is not less than 120 mm, the height is not less than 2200 mm, and the width is not less than 1200 mm. The first embedded plate is made of high-strength structural steel material with a yield strength of not less than 345 MPa and a shear strength of not less than 200 MPa.

[0016] In some embodiments, the front side of the first embedded plate is provided with a countersunk groove, which is used to fit the bottom plate into which the bracket assembly is placed; the first embedded plate is provided with a plurality of first screw holes in the area of ​​the countersunk groove; each of the plurality of second embedded plates is provided with a second screw hole; the plurality of double-ended bolt assemblies pass through the first screw holes and the second screw holes of the plurality of second embedded plates in a corresponding manner.

[0017] In some embodiments, the depth of the countersunk groove is no greater than 60 mm, and the surface flatness of the countersunk groove is no greater than 0.5 mm and the roughness is no greater than 3.2 μm.

[0018] In some embodiments, the plurality of first screw holes are arranged in two vertical columns and one horizontal row, the horizontal row being located above the two vertical columns and forming a U-shape with the two vertical columns facing downwards, and the plurality of first screw holes being symmetrical with respect to the vertical center lines of the two vertical columns.

[0019] In some embodiments, the shear-resistant member is a U-shaped structure with the opening facing upwards.

[0020] In some embodiments, a plurality of shear-resistant members are arranged vertically at intervals along the vertical center lines of the two columns, and are distributed between the first screw holes that are laterally adjacent in the two columns and above the columns.

[0021] In some embodiments, the number of the first screw holes is not less than 11, the number of the shear-resistant members is not less than 5, and the number of the double-ended bolt assemblies and the number of the second embedded plates are the same as the number of the first screw holes.

[0022] In some embodiments, the shear-resistant member has a length of not less than 150 mm, a width of not less than 140 mm, a height of not less than 100 mm, and a thickness of not less than 20 mm. The shear-resistant member is made of high-strength structural steel with a yield strength of not less than 345 MPa and a shear strength of not less than 200 MPa.

[0023] In some embodiments, the shear-resistant member is fixed by welding with welding rods or wires of the same composition as the shear-resistant member and the first embedded plate.

[0024] In some embodiments, the second embedded plate has a length of not less than 250 mm, a width of not less than 250 mm, and a thickness of not less than 60 mm. The second embedded plate is made of high-strength structural steel with a yield strength of not less than 345 MPa and a shear strength of not less than 200 MPa.

[0025] In some embodiments, the length of the stud of the double-ended bolt assembly is not less than 2400 mm based on the thickness of the pit wall; the module of the double-ended bolt assembly is not less than M60, the strength grade is not less than 10.9, the standard thread pitch is adopted, the internal and external threads are mated according to the standard tolerance zone 6H / 6h, the tensile strength of the material is not less than 1080 MPa, and the yield strength of the material is not less than 930 MPa.

[0026] The second objective of this invention is to provide an installation method for a pre-embedded structure used in the assembly of a fusion device.

[0027] An installation method for a pre-embedded structure for assembling a fusion device according to a second aspect of the present invention includes the following steps:

[0028] S1: The steel cage supports the first embedded plate and the multiple second embedded plates, so that the first embedded plate and the multiple second embedded plates are horizontally tensioned and pre-tightened under the cooperation of the corresponding double-headed bolt assemblies;

[0029] S2: Pour concrete to form the foundation pit wall, and fix the surfaces of the first embedded plate and the second embedded plate facing each other to the two side surfaces of the foundation pit wall, thereby exposing the first embedded plate, the second embedded plate and the nuts at both ends of the screw.

[0030] S3: Remove the nut from each screw near the first embedded plate, so that the end of each screw near the first embedded plate passes through the base plate, and screw the nut onto the end of each screw near the first embedded plate to fasten the base plate to the front of the first embedded plate;

[0031] S4: After the subsequent fusion device is assembled, remove the protruding parts of the multiple double-headed bolt assemblies that are exposed on both sides of the foundation pit wall.

[0032] Since the installation method of the pre-embedded structure for fusion device assembly in the second aspect embodiment of the present invention adopts the pre-embedded structure for fusion device assembly in the first aspect embodiment of the present invention, the installation method of the pre-embedded structure for fusion device assembly in the second aspect embodiment of the present invention has the same technical effect as the pre-embedded structure 1000 for fusion device assembly in the first aspect embodiment of the present invention, and has high safety.

[0033] The third objective of this invention is to provide a method for manufacturing a pre-embedded structure for assembling a fusion device.

[0034] A method for manufacturing a pre-embedded structure for assembling a fusion device according to a third aspect of the present invention includes processing a first pre-embedded plate, welding the shear-resistant member to the first pre-embedded plate, processing a second pre-embedded plate, and processing the double-headed bolt assembly.

[0035] The processing of the first embedded plate includes the following steps:

[0036] Material cutting: Select high-strength structural steel raw material with a thickness of not less than 125mm, a yield strength of not less than 345Mpa, and a shear strength of not less than 200Mpa. According to the final forming size of the first embedded plate, leave 2mm on each side for cutting and material cutting to obtain the material cutting plate.

[0037] Initial leveling: The blanking plate is initially leveled to obtain an initially leveled plate with an overall flatness of no more than 1mm;

[0038] Rough milling: Perform countersunk groove rough milling on the surface of the initially leveled plate to obtain a rough milled plate with a rough milling depth of no more than 55mm, a countersunk groove edge perpendicularity of no more than 0.2mm, and a countersunk groove inner surface horizontality of no more than 0.5mm.

[0039] Shaping and leveling: The rough milled plate is heat-treated for shaping and fine leveling to obtain a straightened and leveled plate.

[0040] Fine milling and shaping: The entire straightening and leveling plate is fine milled to obtain a fine milled plate with a milling depth of no more than 5mm, a countersunk groove edge perpendicularity of no more than 0.2mm, a countersunk groove inner surface horizontality of no more than 0.5mm, and a roughness of no more than 3.2um.

[0041] Drilling: Drill a first screw hole with a diameter of 66±1mm and a verticality of no more than 1mm on the precision milled plate to obtain the first embedded plate;

[0042] The processing of the second embedded plate is the same as that of the first embedded plate, and only requires the steps of blanking, leveling, rough milling, fine milling and shaping, and drilling.

[0043] The machining of the double-ended bolt assembly includes the selection of the nut and washer, as well as the machining of the bolt.

[0044] The nut and the washer are selected from finished parts with a strength grade of not less than 10, and the thread pitch of the nut meets the standard requirements and the internal thread tolerance meets 6H.

[0045] The machining of the screw includes the following steps in sequence:

[0046] Screw cutting and straightening: Round steel raw materials with a diameter of not less than 60mm, tensile strength of not less than 1080Mpa, and yield strength of not less than 930Mpa are cut according to the screw length to obtain blank round steel. The blank round steel is then straightened to obtain straightened round steel.

[0047] Threading: External threads are machined on the straight round steel to obtain a semi-finished screw;

[0048] Heat treatment and tempering, blackening treatment: The semi-finished screw is heat-treated and tempered, and then blackened and corrosion-resistant to obtain the screw. Through the above high-precision processing method, the pre-embedded structure for assembling the fusion device according to the first aspect of the present invention can be manufactured.

[0049] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0050] Figure 1 This is a distribution diagram of application scenarios for the pre-embedded structure used in the assembly of the fusion device according to the present invention;

[0051] Figure 2 This is a schematic diagram of the mounting bracket assembly on the pre-embedded structure for assembling the fusion device of the present invention;

[0052] Figure 3 This is a three-dimensional schematic diagram of the embedded structure for assembling the fusion device of the present invention;

[0053] Figure 4 This is a side view of the pre-embedded junction for assembling the fusion device of the present invention;

[0054] Figure 5 This is a rear view of the pre-embedded structure for assembling the fusion device of the present invention;

[0055] Figure 6 This is a perspective view of the first embedded plate of the pre-embedded structure for assembling the fusion device of the present invention;

[0056] Figure 7 This is a schematic diagram of the existing assembly of a fusion device.

[0057] Figure Labels

[0058] Embedded structure 1000 for fusion device assembly; first embedded plate 11; countersunk groove 111; first screw hole 112; vertical row 1121; horizontal row 1122; shear-resistant component 12; second embedded plate 13; double-headed bolt assembly 14; screw 141; nut 142; bracket assembly 2000; base plate 21; sub-module 100; bracket embedded structure 200. Detailed Implementation

[0059] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0060] like Figure 1 As shown, the fusion device assembly embedded structure 1000 according to the first aspect of the present invention is used to be embedded in the foundation pit wall at equal intervals along the circumference, so as to facilitate the corresponding installation of the bracket assembly 2000. The number of fusion device assembly embedded structures 1000 is not less than 16, and the specific number is determined according to the number of buildings and sub-modules (sectors) and evenly distributed. For example, if the number of sub-modules is 16, then there are 16 fusion device assembly embedded structures 1000. In this way, the overall layout stability of the fusion device assembly embedded structures 1000 in the foundation pit wall is strong, the load can be evenly distributed, and the bearing capacity margin is high.

[0061] like Figures 2 to 6 As shown, the pre-embedded structure 1000 for assembling a fusion device according to the first aspect of the present invention includes a first pre-embedded plate 11, a shear-resistant member 12, a second pre-embedded plate 13, and a double-headed bolt assembly 14.

[0062] Specifically, the front side of the first embedded plate 11 is used to contact the base plate 21 of the bracket assembly 2000. That is, the front side of the first embedded plate 11 provides a support mounting position for the base plate 21 of the bracket assembly 2000. In order to bear most of the dynamic and static loads during the assembly of the submodule, the first embedded plate 11 is required to have extremely high structural stability and load-bearing capacity, while also having a high load-bearing capacity margin. The first embedded plate 11 also provides a limit for the double-headed bolt assembly 14.

[0063] There are multiple shear-resistant components 12, which are welded and fixed to the back of the first embedded plate 11. The multiple shear-resistant components 12 are mainly used to provide resistance to vertical shear force, enhance the overall shear resistance of the embedded structure 1000 for fusion device assembly, and increase the shear bearing capacity margin.

[0064] There are multiple second embedded plates 13, which are arranged on one side of the back of the first embedded plate 11 and are spaced apart from the first embedded plate 11. The multiple second embedded plates 13 provide limiting for the corresponding double-headed bolt assemblies 14, provide pre-tightening anchor points for the first embedded plate 11, and form a tension with the first embedded plate 11, providing stability and load-bearing capacity for the entire fusion device assembly embedded structure 1000. At the same time, they have a certain area to reduce the local pressure on the wall surface of the foundation pit.

[0065] There are multiple double-ended bolt assemblies 14, each including a screw 141 and nuts 142 located at both ends of the screw 141. The screws 141 of the multiple double-ended bolt assemblies 14 horizontally pass through the first embedded plate 11 and multiple second embedded plates 13, respectively. The nuts 142 at both ends of each screw 141 are located on the front side of the first embedded plate 11 and the back side of the second embedded plate 13, respectively. Thus, when the fusion device assembly pre-embedded structure 1000 is embedded in the wall, the steel cage frame of the foundation pit wall supports the first embedded plate 11 and multiple second embedded plates 13, causing the first embedded plate 11 and multiple second embedded plates 13 to be horizontally tensioned and pre-tightened under the cooperation of the corresponding double-ended bolt assemblies 14. The double-ended bolt assemblies 14 are mainly used to provide a strong pre-tightening force to the fusion device assembly pre-embedded structure 1000, ensuring the stability and load-bearing capacity of the fusion device assembly pre-embedded structure 1000.

[0066] The installation method of the pre-embedded structure 1000 for fusion device assembly according to the first aspect of the present invention is as follows: First, a steel cage frame is used to support the first pre-embedded plate 11 and a plurality of second pre-embedded plates 13, so that the first pre-embedded plate 11 and the plurality of second pre-embedded plates 13 are horizontally tensioned and pre-tightened under the cooperation of the corresponding double-headed bolt assemblies 14; then, concrete is poured to form a foundation pit wall, and the surfaces of the first pre-embedded plate 11 and the second pre-embedded plates 13 facing each other are fixed to the two side surfaces of the foundation pit wall, so that the nuts 142 at both ends of the first pre-embedded plate 11, the second pre-embedded plate 13, and the screw 141 are exposed; in this way, the double-headed bolt assembly 14 provides a strong pre-tightening force to the pre-embedded structure 1000 for fusion device assembly, which greatly enhances the stability and load-bearing capacity of the entire pre-embedded structure 1000 for fusion device assembly, while the first pre-embedded plate 11 and the second pre-embedded plate 13 are horizontally tensioned and pre-tightened under the cooperation of the corresponding double-headed bolt assemblies 141; then, concrete is poured to form a foundation pit wall, and the surfaces of the first pre-embedded plate 11 and the second pre-embedded plate 13 facing each other are fixed to the two side surfaces of the foundation pit wall, so that the nuts 142 at both ends of the first pre-embedded plate 11, the second pre-embedded plate 13, and the screw 141 are exposed; thus, the double-headed bolt assembly 14 provides a strong pre-tightening force to the pre-embedded structure 1000 for fusion device assembly, which greatly enhances the stability and load-bearing The second embedded plates 13 each have a certain area, reducing the local pressure on the surface of the foundation pit wall. Then, the nuts 142 near the first embedded plate 11 on each screw 141 are removed, so that the end of each screw 141 near the first embedded plate 11 passes through the base plate 21, and the nuts 142 are screwed on the end of each screw 141 near the first embedded plate 11 to fasten the base plate 21 to the front of the first embedded plate 11. The bracket assembly 2000 is easy and quick to install. Finally, after the subsequent fusion device is assembled, the protruding parts of the multiple double-headed bolt assemblies 14 exposed on both sides of the foundation pit wall are removed to avoid affecting the magnetic confinement state of the fusion device and to prevent some elements in the embedded metal structure from being activated and forming high radiation dose rate isotopes with long decay periods or high radiation dose rate isotopes with short decay periods, thus ensuring high safety.

[0067] The pre-embedded structure 1000 for fusion device assembly according to the first aspect of the present invention has the following advantages: On the one hand, by setting a first pre-embedded plate 11, a plurality of second pre-embedded plates 13 and a plurality of double-headed bolt assemblies 14, a strong pre-tightening force can be provided to the pre-embedded structure 1000 for fusion device assembly, ensuring the stability and load-bearing capacity of the pre-embedded structure 1000 for fusion device assembly, while having a high load-bearing capacity margin; on the other hand, by setting a plurality of shear-resistant members 12 on the back of the first pre-embedded plate 11, the overall shear resistance of the pre-embedded structure 1000 for fusion device assembly can be enhanced, increasing the shear load-bearing capacity margin; furthermore, the bracket assembly 2000 can be conveniently installed by the first pre-embedded plate 11 and the plurality of double-headed bolt assemblies 14; in addition, both the first pre-embedded plate 11 and the second pre-embedded plate 13 have a certain area, reducing the local pressure on the wall surface.

[0068] In some embodiments, the first embedded plate 11 has a thickness of not less than 120 mm, a height of not less than 2200 mm, and a width of not less than 1200 mm. The first embedded plate 11 is made of high-strength structural steel with a yield strength of not less than 345 MPa and a shear strength of not less than 200 MPa. The first embedded plate 11 has extremely high structural stability and load-bearing capacity, and also has a high load-bearing capacity margin.

[0069] In some embodiments, the front side of the first embedded plate 11 is provided with a countersunk groove 111. The countersunk groove 111 is used to fit the base plate 21 of the bracket assembly 2000, so that the base plate 21 of the bracket assembly 2000 is conveniently and quickly positioned in the countersunk groove 111. At the same time, it ensures the contact rate between the embedded structure 1000 for fusion device assembly and the base plate 21 of the bracket assembly 2000, avoids point and line contact, and ensures that the load of the base plate 21 of the bracket assembly 2000 is fully transferred to the embedded structure for fusion device assembly. The structure 1000 has a first embedded plate 11 with multiple first screw holes 112 in the countersunk groove 111 area; multiple second embedded plates 13 each have a second screw hole to facilitate the installation of double-headed bolt assemblies 14; multiple double-headed bolt assemblies 14 pass through the first screw holes 112 and the second screw holes of the multiple second embedded plates 13 in a one-to-one correspondence to provide a strong pre-tightening force to the fusion device assembly embedded structure 1000, ensuring the stability and load-bearing capacity of the fusion device assembly embedded structure 1000. In some embodiments, the depth of the countersunk groove 111 is no more than 60 mm. That is, processing a countersunk groove 111 with a depth of no more than 60 mm on a plate with a thickness of no less than 120 mm can reduce the welds of the pre-embedded structure 1000 for fusion device assembly, ensuring structural stability and load-bearing capacity. The surface flatness of the countersunk groove 111 is no more than 0.5 mm and the roughness is no more than 3.2 μm. This can ensure the contact rate between the pre-embedded structure 1000 for fusion device assembly and the base plate 21 of the bracket assembly 2000, avoid point and line contact, and ensure that the load of the base plate 21 of the bracket assembly 2000 is fully transferred to the pre-embedded structure 1000 for fusion device assembly.

[0070] In some embodiments, the plurality of first screw holes 112 are arranged in two vertical rows 1121 and one horizontal row 1122. The horizontal row 1122 is located above the two vertical rows 1121 and forms a U-shape with the two vertical rows 1121 facing downwards. The plurality of first screw holes 112 are symmetrical with respect to the vertical center lines of the two vertical rows 1121. This arrangement of the first screw holes 112 is beneficial for the double-ended bolt assembly 14 to provide a strong pre-tightening tension to the fusion device assembly pre-embedded structure 1000, ensuring the stability and load-bearing capacity of the fusion device assembly pre-embedded structure 1000.

[0071] To facilitate the disassembly and assembly of the bracket assembly 2000, such as Figure 6 As shown, the horizontal row 1122 and the two vertical rows 1121 are close to the edge of the countersunk groove 111.

[0072] In some embodiments, as Figure 5 As shown, the shear member 12 is a U-shaped structure with the opening facing upward. The shear member 12 has high structural strength and stability, a large contact area with the concrete wall, and strong anti-slip ability.

[0073] In some embodiments, a plurality of shear-resistant members 12 are arranged vertically at intervals along the vertical center lines of two vertical columns 1121, and are distributed between the first screw holes 112 that are laterally adjacent in the two vertical columns 1121 and above the horizontal row 1122. In this way, the screws 141 of the fusion device assembly pre-embedded structure 1000 are prevented from being subjected to shear forces, thereby improving the stability of the fusion device assembly pre-embedded structure 1000.

[0074] In some embodiments, the number of first screw holes 112 is not less than 11, the number of double-ended bolt assemblies 14 and the number of second embedded plates 13 are the same as the number of first screw holes 112, providing strong pre-tightening force to the embedded structure to ensure the stability and load-bearing capacity of the embedded structure; the number of shear-resistant members 12 is not less than 5, which can enhance the overall shear resistance of the embedded structure and increase the shear bearing capacity margin.

[0075] In some embodiments, the shear member 12 has a length of not less than 150 mm, a width of not less than 140 mm, a height of not less than 100 mm, and a thickness of not less than 20 mm. The shear member 12 is made of high-strength structural steel with a yield strength of not less than 345 MPa and a shear strength of not less than 200 MPa. This shear member 12 has a large shear section, strong shear bearing capacity, and a large shear bearing capacity margin.

[0076] In some embodiments, the shear member 12 is fixed by welding with welding rods or welding wires of the same composition as the shear member 12 and the first embedded plate 11, which can improve the weld strength and avoid welding defects such as cracks.

[0077] In some embodiments, the second embedded plate 13 has a length of not less than 250 mm, a width of not less than 250 mm, and a thickness of not less than 60 mm. The second embedded plate 13 is made of high-strength structural steel with a yield strength of not less than 345 MPa and a shear strength of not less than 200 MPa. The second embedded plate 13 provides a limit for the double-headed bolt assembly 14, provides a pre-tightening anchor point for the first embedded plate 11, provides stability and load-bearing capacity for the entire embedded structure, and has a certain area to reduce local pressure on the surface of the foundation pit wall.

[0078] In some embodiments, the length of the screw 141 of the double-ended bolt assembly 14 is not less than 2400 mm based on the wall thickness; the double-ended bolt assembly 14 has a module of not less than M60, a strength grade of not less than 10.9, uses standard thread pitch, and the internal and external thread fits according to the standard tolerance zone 6H / 6h; the material tensile strength is not less than 1080 MPa, and the material yield strength is not less than 930 MPa. This double-ended bolt assembly 14 has sufficiently high tensile strength, as well as extremely strong load-bearing and self-locking capabilities, ensuring that the threads are undamaged and will not loosen under strong preload.

[0079] The second aspect of the present invention provides an installation method for a pre-embedded structure 1000 for assembling a fusion device, wherein the pre-embedded structure 1000 for assembling a fusion device is the same as the pre-embedded structure 1000 for assembling a fusion device according to the first aspect of the present invention.

[0080] The installation method of the pre-embedded structure 1000 for assembling a fusion device according to a second aspect embodiment of the present invention includes the following steps:

[0081] S1: The steel cage supports the first embedded plate 11 and multiple second embedded plates 13, so that the first embedded plate 11 and multiple second embedded plates 13 are horizontally tensioned and pre-tightened under the cooperation of the corresponding double-headed bolt assemblies 14.

[0082] S2: Pour concrete to form the foundation pit wall and fix the surfaces of the first embedded plate 11 and the second embedded plate 13 opposite to each other to the two sides of the wall, thereby exposing the first embedded plate 11, the second embedded plate 13 and the nuts 142 at both ends of each screw 141.

[0083] Through steps S1 and S2, the first embedded plate 11 and the second embedded plate 13, in cooperation with the double-headed bolt assembly 14, provide a strong horizontal tensile preload for the fusion device assembly embedded structure 1000, which greatly enhances the stability and load-bearing capacity of the entire fusion device assembly embedded structure 1000. At the same time, the first embedded plate 11 and the second embedded plate 13 both have a certain area, which reduces the local pressure on the side wall of the foundation pit.

[0084] S3: Remove the nut 142 on each screw 141 near the first embedded plate 11, so that the end of each screw 141 near the first embedded plate 11 passes through the base plate 21, and screw the nut 142 on the end of each screw 141 near the first embedded plate 11 to fasten the base plate 21 to the front of the first embedded plate 11. Thus, the bracket assembly 2000 is easy and quick to install.

[0085] S4: After the subsequent fusion device is assembled, remove the protruding parts of the multiple double-headed bolt assemblies 14 that are exposed on both sides of the wall.

[0086] It should be noted that the embedded structures on the exposed concrete surface of the tokamak fusion device, especially in the core region of the magnetic field, affect the magnetic confinement state of the tokamak fusion device due to the magnetic permeability of the embedded structures on the exposed concrete surface. This can lead to plasma configuration shifts, reduced plasma heating efficiency, and wear and tear on internal components of the tokamak fusion device. In severe cases, it can even cause internal components of the tokamak device to melt and be damaged by exposure to high-temperature plasma or the enormous energy of nuclear fusion.

[0087] Meanwhile, although nuclear fusion does not produce long-term radioactive waste, it can activate elements in the embedded metal structure exposed on the concrete surface. Some of these activated elements can form high-dose-rate isotopes with long decay periods or high-dose-rate isotopes with short decay periods. As a permanent structure of the tokamak device, the embedded metal structure is located throughout the core operating area of ​​the tokamak. During subsequent operation, maintenance, and upgrades, personnel entering and exiting this area may be directly exposed to radiation damage if high-dose-rate isotopes with long or short decay periods are present. This could also lead to radioactive contamination events and potentially cause even more serious consequences.

[0088] Therefore, the pre-embedded structure 1000 for fusion device assembly, in addition to possessing extremely strong load-bearing capacity and stability, also needs to be removable after assembly, not permanently retained, and exposed on the outer surface of the building wall concrete. Through step S4, after the subsequent fusion device assembly is completed, the protruding parts of multiple double-headed bolt assemblies 14 exposed on both sides of the wall are removed, i.e., the nuts 142 and washers on each bolt 141 are removed, and the first pre-embedded plate 11, the second pre-embedded plate 13, and the bolt 141 segments exposed on both sides of the wall are cut off. This avoids the pre-embedded structure 1000 affecting the magnetic confinement state of the fusion device, and prevents the activation of some elements in the pre-embedded metal structure, thus avoiding the formation of high-radiation-dose-rate isotopes with long decay periods or short decay periods, ensuring high safety.

[0089] Since the installation method of the fusion device assembly pre-embedded structure 1000 of the second aspect embodiment of the present invention adopts the fusion device assembly pre-embedded structure 1000 of the first aspect embodiment of the present invention, the installation method of the fusion device assembly pre-embedded structure 1000 of the second aspect embodiment of the present invention has the same technical effect as the fusion device assembly pre-embedded structure 1000 of the first aspect embodiment of the present invention, and has high safety.

[0090] The third aspect of the present invention provides a method for manufacturing a pre-embedded structure 1000 for fusion device assembly, wherein the pre-embedded structure 1000 for fusion device assembly is the same as the pre-embedded structure 1000 for fusion device assembly of the first aspect of the present invention.

[0091] A method for manufacturing a pre-embedded structure 1000 for fusion device assembly according to a third aspect embodiment of the present invention includes processing a first pre-embedded plate 11, welding a shear-resistant member 12 to the first pre-embedded plate 11, processing a second pre-embedded plate 13, and processing a double-headed bolt assembly 14.

[0092] The processing of the first embedded plate 11 includes the following steps:

[0093] Material cutting: Select high-strength structural steel raw material with a thickness of not less than 125mm, a yield strength of not less than 345Mpa, and a shear strength of not less than 200Mpa. According to the final forming size of the first embedded plate 11, leave 2mm on each side for cutting and material cutting to obtain the material cutting plate.

[0094] Specifically, the high-strength structural steel plate can be high-strength low-alloy structural steel or other high-strength structural steel plates with a yield strength of not less than 345 MPa and a shear strength of not less than 200 MPa. The entire high-strength structural steel plate is lifted and positioned on the operating table of an online cutting or other cutting machine tool using electromagnetic suction. According to the final forming size of the first embedded plate 11, 2 mm is reserved on each side for cutting. After the plate is cut, the burrs are removed to obtain the cut plate. The cut plate is measured and the data is recorded.

[0095] Initial leveling: Initial leveling of the cut-out boards to obtain boards with an overall flatness of no more than 1mm.

[0096] Specifically, the blanking plate is positioned on the operating table of the CNC gantry milling machine using electromagnetic attraction. The program is set, and the milling machine is used to perform initial leveling of the entire blanking plate. After leveling, a steel straightedge or stone straightedge is used in conjunction with a feeler gauge to measure the overall flatness of the initially leveled plate, which is required to be no greater than 1mm.

[0097] Rough milling: Perform rough milling of the countersunk groove 111 on the surface of the initially leveled plate to obtain a rough milled plate with a rough milling depth of no more than 55mm, a countersunk groove 111 edge perpendicularity of no more than 0.2mm, and a countersunk groove 111 inner surface horizontality of no more than 0.5mm.

[0098] Specifically, based on the outline of the bracket assembly 2000 and the dimensions of the base plate 21, a program is set to perform rough milling of the countersunk groove 111 on the initial leveling plate. The rough milling depth is no more than 55mm, the perpendicularity of the countersunk groove 111 edge is no more than 0.2mm, the horizontality of the inner surface of the countersunk groove 111 is no more than 0.5mm, and the feed amount per cut is no more than 1mm.

[0099] Shaping and leveling: The rough milled plate is heat-treated for shaping and fine leveling to obtain a straightened and leveled plate.

[0100] Specifically, for rough milled plates that have developed inward bending due to heat accumulation after rough milling, heat treatment and fine leveling should be performed. The heat treatment method should not affect the strength of the material itself, and at the same time dissipate the residual internal stress generated during the rough milling process.

[0101] Fine milling and shaping: The entire straightening and leveling plate is fine milled to obtain a fine milled plate with a milling depth of no more than 5mm, a countersunk groove 111 edge perpendicularity of no more than 0.2mm, a countersunk groove 111 inner surface horizontality of no more than 0.5mm, and a roughness of no more than 3.2um.

[0102] Specifically, the leveling and shaping sheet material is positioned on the operating table of the CNC gantry milling machine using electromagnetic attraction. The program is set, and the milling machine is used to perform finish milling on the entire sheet material. The finish milling depth should not exceed 5mm, the perpendicularity of the countersunk groove 111 edge should not exceed 0.2mm, the horizontality of the inner surface of the countersunk groove 111 should not exceed 0.5mm, and the feed rate per pass should not exceed 1mm. The surface roughness after finish milling should not exceed 3.2µm. This can be checked using a roughness tester or a roughness comparison block. The inspection ratio should be no less than 10 points per square meter, with each point spaced at least 200mm apart.

[0103] Drilling: Drill a first screw hole 112 with a diameter of 66±1mm and a vertical diameter of no more than 1mm on the precision milled plate to obtain the first embedded plate 11.

[0104] Specifically, the precision-milled sheet metal is positioned on the CNC drilling machine's operating table using an electromagnetic chuck. The program is set, and drilling is performed according to the arrangement of the double-ended bolt assembly 14. The diameter of the first screw hole 112 is 66±1mm, and the vertical deviation should not exceed 1mm. Before drilling, a steel scriber is used to mark the lines on the sheet metal surface. Then, a small drill bit is used for positioning and drilling, followed by enlarging the hole with a large drill bit.

[0105] Welding of the shear-resistant component 12 and the first embedded plate 11: The shear-resistant component 12 is made of hot-rolled steel or welded from steel. The first embedded plate 11 is flipped using an electromagnetic chuck, and a scribe line is used to mark the back of the first embedded plate 11. Welding is performed using welding materials of the same composition as the shear-resistant component 12 and the first embedded plate 11. The welding process should include degreasing and rust removal, preheating, tack welding, root pass and fill pass welding, post-weld insulation, and non-destructive testing. Non-destructive testing should include 100% visual inspection plus 10% liquid penetrant / magnetic particle inspection. Dimensional acceptance and packaging of the first embedded plate 11 and shear-resistant component 12 after welding: The overall dimensions of the first embedded plate 11 and shear-resistant component 12 are inspected, and rust-preventive oil is applied. Then, they are packed into boxes using an electromagnetic chuck. The first embedded plate 11 and shear-resistant component 12 are separated by sleepers. After packing, they are ready for shipment.

[0106] The processing of the second embedded plate 13 is the same as that of the first embedded plate 11, and only requires the steps of blanking, leveling, rough milling, fine milling and shaping, and drilling.

[0107] The machining of the double-ended bolt assembly 14 includes the selection of the nut 142 and washer, as well as the machining of the screw 141.

[0108] Nut 142 and washer should be finished parts with a strength grade of not less than 10. The thread pitch of nut 142 should meet the standard requirements, and the internal thread tolerance should meet 6H. All parts should be inspected using thread gauges (go and check). The machining of screw 141 includes the following steps:

[0109] Screw 141 blanking and straightening: Round steel raw materials with a diameter of not less than 60mm, tensile strength of not less than 1080Mpa, and yield strength of not less than 930Mpa are cut to the length of screw 141. If a saw or wire EDM is used, the edge burrs are removed to obtain the blanked round steel. The blanked round steel is then straightened to obtain straightened round steel. Threading: External threads are machined on the straightened round steel to obtain a semi-finished screw. Specifically, the straightened round steel is installed on a lathe fixture, and threading is performed using a thread die. After threading, the shape and integrity of the external thread are checked, and burrs, flash, and metal chips are removed.

[0110] Heat treatment and tempering, blackening treatment: The semi-finished screw is tempered and blackened for corrosion protection by heat treatment to obtain screw 141.

[0111] Screw 141 dimensional acceptance: Use thread gauges and no-go gauges to check all threads.

[0112] Double-ended bolt assembly 14 to be inspected: During the processing of screw 141, test pieces should be made in accordance with the processing method of screw 141, and samples should be taken and sent to the corresponding qualified inspection unit for inspection in accordance with the relevant standard requirements of screw 141 for chemical, hardness, tensile and other standards. The finished nut 142 should also be tested in accordance with the standard requirements of chemical, hardness, and guaranteed load, and samples should be taken and sent to the corresponding qualified inspection unit for inspection.

[0113] Packaging of double-ended bolt assembly 14: After protecting the internal and external threads, pack the assembly into boxes and await shipment. The bolts 141 should be effectively rigidly isolated.

[0114] The above-described high-precision processing method can be used to manufacture the embedded structure 1000 for assembling the fusion device according to the first aspect of the present invention.

[0115] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0116] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0117] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0118] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0119] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0120] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for installing a pre-embedded structure for assembling a fusion device, characterized in that, The pre-embedded structure for assembling the fusion device is pre-embedded in the foundation pit wall at equal intervals along the circumference, and the installation method includes the following steps: S1: The first embedded plate and multiple second embedded plates are supported by a steel cage frame, so that the first embedded plate and multiple second embedded plates are horizontally tensioned and pre-tightened under the cooperation of corresponding double-headed bolt assemblies; wherein, each double-headed bolt assembly includes a screw and nuts located at both ends of the screw; S2: Pour concrete to form the foundation pit wall, and fix the surfaces of the first embedded plate and the second embedded plate facing each other to the two side surfaces of the foundation pit wall, thereby exposing the first embedded plate, the second embedded plate and the nuts at both ends of the screw. S3: Remove the nut on each screw near the first embedded plate, so that the end of each screw near the first embedded plate passes through the bottom plate of the bracket assembly, and screw the nut on the end of each screw near the first embedded plate to fasten the bottom plate to the front of the first embedded plate. S4: After the fusion device is assembled, remove the protruding parts of the multiple double-headed bolt assemblies that are exposed on both sides of the foundation pit wall to avoid affecting the magnetic confinement state of the fusion device.

2. The installation method of the pre-embedded structure for fusion device assembly according to claim 1, characterized in that, Multiple shear-resistant components are welded and fixed on the back of the first embedded plate.

3. The installation method of the pre-embedded structure for fusion device assembly according to claim 1, characterized in that, The first embedded plate has a thickness of not less than 120mm, a height of not less than 2200mm, and a width of not less than 1200mm. The first embedded plate is made of high-strength structural steel with a yield strength of not less than 345Mpa and a shear strength of not less than 200Mpa.

4. The installation method of the pre-embedded structure for fusion device assembly according to claim 3, characterized in that, The first embedded plate has a countersunk groove on its front side, which is used to fit the base plate into which the bracket assembly is placed; the first embedded plate has a plurality of first screw holes in the area of ​​the countersunk groove; each of the plurality of second embedded plates has a second screw hole; the plurality of double-ended bolt assemblies pass through the first screw holes and the second screw holes of the plurality of second embedded plates in a corresponding manner.

5. The installation method of the pre-embedded structure for fusion device assembly according to claim 4, characterized in that, The depth of the countersunk groove is no greater than 60 mm, and the surface flatness of the countersunk groove is no greater than 0.5 mm and the roughness is no greater than 3.2 μm.

6. The installation method of the pre-embedded structure for fusion device assembly according to claim 4, characterized in that, The plurality of first screw holes are arranged in two vertical columns and one horizontal row. The horizontal row is located above the two vertical columns and forms a U-shaped arrangement with the two vertical columns facing downwards. The plurality of first screw holes are symmetrical with respect to the vertical center lines of the two vertical columns.

7. The installation method of the pre-embedded structure for fusion device assembly according to claim 6, characterized in that, The shear-resistant component is a U-shaped structure with the opening facing upwards.

8. The installation method of the pre-embedded structure for fusion device assembly according to claim 6, characterized in that, Multiple shear-resistant members are arranged vertically at intervals along the vertical center lines of the two columns, and are distributed between the first screw holes that are laterally adjacent in the two columns and above the columns.

9. The installation method of the pre-embedded structure for assembling a fusion device according to claim 8, characterized in that, The number of the first screw holes is not less than 11, the number of the shear-resistant components is not less than 5, and the number of the double-ended bolt assemblies and the number of the second embedded plates are the same as the number of the first screw holes.

10. The installation method of the pre-embedded structure for assembling a fusion device according to claim 7, characterized in that, The shear-resistant component has a length of not less than 150 mm, a width of not less than 140 mm, a height of not less than 100 mm, and a thickness of not less than 20 mm. The shear-resistant component is made of high-strength structural steel with a yield strength of not less than 345 MPa and a shear strength of not less than 200 MPa.

11. The installation method of the pre-embedded structure for assembling a fusion device according to claim 10, characterized in that, The shear-resistant component is fixed by welding with welding rods or welding wires of the same composition as the shear-resistant component and the first embedded plate.

12. The installation method of the pre-embedded structure for assembling a fusion device according to any one of claims 1-11, characterized in that, The second embedded plate has a length of not less than 250mm, a width of not less than 250mm, and a thickness of not less than 60mm. The second embedded plate is made of high-strength structural steel with a yield strength of not less than 345Mpa and a shear strength of not less than 200Mpa.

13. The installation method of the pre-embedded structure for assembling a fusion device according to any one of claims 1-11, characterized in that, The length of the bolt of the double-ended bolt assembly is not less than 2400mm based on the thickness of the foundation pit wall; the module of the double-ended bolt assembly is not less than M60, the strength grade is not less than 10.9, the standard thread pitch is adopted, the internal and external threads are matched according to the standard tolerance zone 6H / 6h, the tensile strength of the material is not less than 1080Mpa, and the yield strength of the material is not less than 930Mpa.

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