A flexible adjustable connecting structure for nuclear island civil engineering and a connecting method thereof
By using a flexible adjustable connection structure, ball joint components and flexible connectors are used to compensate for steel bar deviations, forming a continuous tensile system. This solves the problems of construction accuracy and durability of steel bar connections in nuclear island civil engineering, and improves seismic performance and fatigue life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE CO LTD
- Filing Date
- 2025-08-26
- Publication Date
- 2026-07-31
AI Technical Summary
In existing nuclear island civil engineering projects, steel reinforcement connection technology suffers from problems such as difficulty in controlling construction accuracy, insufficient seismic resistance and durability, and poor performance of traditional connection methods in nuclear environments.
The system employs a flexible and adjustable connection structure, including a ball joint assembly and a flexible connector. The ball joint steering rod compensates for the angle deviation of the reinforcing bars, the oblique connector adjusts the length, and the flexible connector transmits tensile force, forming a continuous tensile system and providing a compressive support point to achieve self-adaptation to large deviations.
It achieves high efficiency, reliability and durability of steel reinforcement connections in the nuclear island environment, adapts to the precision deviation of modular construction, and improves seismic performance and fatigue life.
Smart Images
Figure CN120889370B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of nuclear power civil engineering technology, specifically to a flexible adjustable connection structure and its connection method for nuclear island civil engineering. Background Technology
[0002] As the core safety barrier of a nuclear power plant, the nuclear island's civil structure must maintain its integrity under extreme conditions. The performance of the steel reinforcement connections directly affects the overall structure's seismic resistance, durability, and construction reliability, and currently faces three unique challenges: First, the mechanical environment is harsh, requiring the nuclear island to withstand high-cycle fatigue loads under design-base earthquakes and severe accident earthquakes, while resisting tensile-compressive alternating stresses under accident conditions. Second, the service environment is severe, with long-term exposure to high temperatures of 60~200℃, 100% relative humidity, and strong neutron irradiation (cumulative flux ≥10^19 nvt), leading to a significant increase in the risk of material embrittlement and stress corrosion. Third, construction precision is limited, with modular assembly construction technology often used in nuclear islands. To meet the needs of on-site modular installation, the allowable construction error for steel reinforcement is often large. Due to the significant deviation in steel reinforcement positioning during modular construction, the tolerance limit of conventional mechanical connections is far exceeded.
[0003] Based on the above, the existing nuclear island steel reinforcement connection technology in nuclear power civil engineering has certain technical problems: In the construction of nuclear island civil structures, conventional mechanical connection methods are often difficult to meet the requirements of conventional mechanical connection due to the large diameter of the reinforcing bars. In addition, the construction of nuclear island civil structures often adopts prefabricated construction technology. Especially when using the prefabricated method of reinforcing cage, the coaxiality deviation of the reinforcing bars, such as axial deviation, angular deviation and spacing deviation, is often difficult to control. Conventional mechanical connection methods cannot meet the construction requirements. That is, conventional mechanical connection methods rely on high-precision reinforcing bar alignment and cannot adapt to the cumulative deviation of modular construction.
[0004] Welded connections for reinforcing bars often result in slow construction progress, large quality fluctuations, embrittlement of the heat-affected zone, and concentration of residual stress. Furthermore, the presence of open flames on the construction site poses a significant fire hazard.
[0005] The lap splice method for reinforcing bars has technical problems such as discontinuous stress transfer, spatial constraints (i.e., difficulty in meeting the lap length requirements of reinforcing bars in space), and poor seismic performance. In addition, in the civil structure of the nuclear island, the reinforcing bars are subjected to complex stresses. When there are axial tension or small eccentric tension conditions of the reinforcing bars, the lap splice connection cannot guarantee the stability of the connection.
[0006] The industry's attempts at improvement have failed to overcome technical bottlenecks. These include shape memory alloy connectors, which are prone to hyperelastic failure under high-temperature environments and experience significant reduction in recovery stress; hydraulic expansion connections, which are sensitive to the ellipticity of reinforcing bars and have insufficient on-site hole enlargement qualification rates; and grouting sleeves, which suffer from large fluctuations in grout density in humid environments and cannot compensate for angular deviations.
[0007] It is evident that there are contradictions between construction tolerance and structural reliability, namely, the current large deviation adaptation measures significantly weaken the stiffness of node connections; contradictions between tensile and compressive strength, namely, the current ordinary mechanical connection structures are unable to provide stable compressive support points; and contradictions between nuclear environment durability and construction convenience, namely, radiation-resistant materials are difficult to process and use on-site. Summary of the Invention To address the problems existing in the prior art, this invention provides a flexible adjustable connection structure and its connection method for nuclear island civil engineering, which avoids the connection problems caused by traditional mechanical connections, welding, lap splicing, grouting sleeves and other traditional connection methods. It also has large axial and angular tolerances, reliable tensile and compressive strength, and is easy to manufacture and install.
[0008] The technical solution of the present invention is as follows: In a first aspect of the invention, a flexible adjustable connection structure for nuclear island civil engineering is provided, including a ball joint assembly. The ball joint assembly includes two ball joint bases, and ball joint steering rods are respectively connected to opposite ends of the two ball joint bases. The two ball joint steering rods are connected to each other by a plurality of oblique connectors and adjusting connectors. Nuts are respectively connected to the far ends of the two ball joint bases. Both nuts are connected to sleeves at the ends away from the ball joint base. Hollow screws are provided inside the two sleeves. The two hollow screws extend axially out of the sleeves and are respectively connected to the nuts. The ends of the two sleeves away from the nuts are respectively connected to the steel reinforcement structure. The two hollow screws, the two ball joint bases, the two ball joint steering rods, and the several oblique connecting parts and adjusting connecting parts are connected by flexible connecting parts in the middle.
[0009] In some embodiments of the present invention, one end of the ball joint base is provided with a ball joint connecting groove, and one end of the ball joint steering rod is rotatably connected to the ball joint connecting groove; The other end face of the ball joint base is provided with an annular flange, and the end face of the nut near the ball joint base is provided with an annular keyway. The annular flange and the annular keyway are adapted to be connected. The annular flange at the end of the ball joint base has a groove structure in the middle, and the inner wall of the groove structure has an internal thread structure that is threaded to the hollow screw. A connecting channel is provided between the ball joint connecting groove and the groove structure. In some embodiments of the present invention, the sleeve, nut, and ball joint base are configured as cylindrical structures, and the sleeve, nut, and ball joint base have the same diameter. In some embodiments of the present invention, the sleeve has a hollow screw arranged axially inside, one end of the hollow screw has an end plate, and the end plate has a plurality of screw protrusions arranged circumferentially outside. The inner wall of the sleeve has a plurality of sleeve keyways arranged axially, and the plurality of screw protrusions are adapted to the plurality of sleeve keyways. In some embodiments of the present invention, the flexible connector is arranged to pass through two hollow screws, two ball joint bases, two ball joint steering rods, several oblique connectors and adjusting connectors along the axial direction. The end plates of the two hollow screws are provided with through holes along the axial direction in the middle. The two ends of the flexible connector pass through the through holes on both sides and are provided with anchor heads at the ends to be engaged with the outside of the through holes. In some embodiments of the present invention, one end of the oblique connector is provided with a plurality of flange structures, and the other end of the oblique connector is provided with a plurality of groove structures. The flange structures and groove structures are adapted to each other, and the plurality of oblique connectors are connected sequentially from end to end along the axial direction through the flange structures and groove structures. In some embodiments of the present invention, the two ends of the adjusting connector are connected to the oblique connector and the ball joint steering rod respectively by means of keyway connection along the axial direction of the oblique connector; the adjusting connector is provided with a first adjusting component and a second adjusting component, and the first adjusting component and the second adjusting component are connected by means of keyway connection along the axial direction perpendicular to the oblique connector.
[0010] In some embodiments of the present invention, the ball joint steering rod is connected to the oblique connector and the adjusting connector via a keyway connection. In some embodiments of the present invention, the flexible connector is configured as a prestressed steel wire or steel strand. In a second aspect of the invention, a connection method for a flexible adjustable connection structure used in nuclear island civil engineering is provided, comprising: Prefabricate the sleeve, hollow screw, nut, ball joint base, ball joint steering rod, oblique connector and adjusting connector according to the actual situation; Assemble the sleeve, hollow screw, nut, ball joint base, ball joint steering rod, oblique connector and adjusting connector according to the set assembly sequence; An anchor head is set at one end of the flexible connector, and the other end of the flexible connector is passed through the hollow screw, nut, ball joint base, ball joint steering rod and several oblique connectors and adjusting connectors in the middle, as well as the ball joint base, nut and hollow screw at the other end. An anchor head is installed at the other end of the flexible connector to snap into the end plate of the hollow screw, and the component assembly is completed. During construction, the steel reinforcement structures on both sides are first connected to the sleeve. Then, the ball hinge steering rod is rotated to an angle that ensures the entire cross-section of the inclined connector fits tightly. A certain number of adjusting connectors are then installed at the inclined connector. Finally, the flexible connectors are tightened by rotating the nuts on both sides to complete the installation of the connection structure.
[0011] One or more technical solutions of the present invention have the following beneficial effects: This invention provides a flexible adjustable connection structure and its connection method for nuclear island civil engineering. Through the coordinated connection of a ball joint assembly, a connecting assembly, and a flexible connector, it achieves a breakthrough in nuclear island steel reinforcement connection technology. Specifically: It has a large deviation adaptive capability. The ball joint steering rod rotates freely in the ball joint base to compensate for the axial angle deviation of the steel structure. The length can be adjusted by combining the adjusting connector and the oblique connector to adapt to different steel bar spacing. The hollow screw rod can actively correct the axial position deviation by rotating and extending the nut. Flexible connectors run through all components to form a continuous tensile system, efficiently transmitting seismic tensile forces. After prestressing, the oblique connectors fit the entire cross section and form a rigid compressive support with the ball joint base. The sleeve and hollow screw, as well as the oblique connectors, are connected by keyways to provide shear and torsional bearing capacity. Flange and groove structures enable rapid expansion and interlocking of oblique connectors; double nuts rotate synchronously to tighten flexible connectors, quantitatively controlling the prestress level; ball joint steering rods freely rotate and lock, simplifying the on-site alignment process; The flexible connectors are made of prestressed steel wire or steel strand to ensure the overall irradiation stability of the connection structure and improve fatigue life. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of a flexible adjustable connection structure for nuclear island civil engineering provided in Embodiment 1 of the present invention; Figure 2 This is a cross-sectional schematic diagram of the sleeve provided in Embodiment 1 of the present invention; Figure 3 This is a cross-sectional schematic diagram of the hollow screw provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the structure of the hollow screw with an anchor head at the end provided in Embodiment 1 of the present invention; Figure 5 This is a cross-sectional schematic diagram of the nut provided in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the annular keyway structure on the nut provided in Embodiment 1 of the present invention; Figure 7 This is a cross-sectional schematic diagram of the ball joint base provided in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the annular flange on the ball joint base provided in Embodiment 1 of the present invention; Figure 9 This is a cross-sectional schematic diagram of the ball joint steering rod provided in Embodiment 1 of the present invention; Figure 10 This is a schematic diagram of the connection end face of the oblique connector provided in Embodiment 1 of the present invention; Figure 11 This is a side sectional view of the oblique connector provided in Embodiment 1 of the present invention; Figure 12 This is a schematic diagram of the adjusting connector provided in Embodiment 1 of the present invention. Figure 1 ; Figure 13 This is a schematic diagram of the adjusting connector provided in Embodiment 1 of the present invention. Figure 2 .
[0013] In the diagram: 1. Reinforcing steel structure; 2. Sleeve; 3. Hollow screw; 4. Nut; 5. Ball joint base; 6. Ball joint steering rod; 7. Flexible connector; 8. Anchor head; 9. Angled connector; 10. Adjustable connector; 11. Annular flange; 12. Annular keyway; 13. Internal thread structure. Detailed Implementation
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0015] Example 1 In a typical embodiment of the present invention, such as Figures 1 to 13 As shown, a flexible adjustable connection structure for nuclear island civil engineering is proposed, including a ball joint assembly. The ball joint assembly includes two ball joint bases 5. The opposite ends of the two ball joint bases 5 are respectively connected to ball joint steering rods 6. The two ball joint steering rods 6 are connected to each other by a number of oblique connectors 9 and adjusting connectors 10. Nuts 4 are respectively connected to the opposite ends of the two ball joint bases 5. Each of the two nuts 4 is connected to a sleeve 2 at the end away from the ball joint base 5. The two sleeves 2 are provided with hollow screws 3. The two hollow screws 3 pass through the sleeves 2 along the axial direction and are respectively connected to the nuts 4. The nuts 4 are provided with an internal thread structure 13 and are threadedly connected to the hollow screws 3. The ends of the two sleeves 2 away from the nuts 4 are respectively connected to the steel reinforcement structure 1. Two hollow screws 3, two ball joint bases 5, two ball joint steering rods 6, several oblique connectors 9, and an adjusting connector 10 are connected by a flexible connector 7 in the middle.
[0016] With the above settings, the ball joint steering rod 6 in the ball joint assembly can rotate in multiple directions to compensate for the axial deviation and spacing deviation of the steel structure 1. The combined design of the oblique connector 9 and the adjusting connector 10 can adapt to the connection requirements of steel bars with different spacings by increasing or decreasing the number of components. The flexible connector 7 runs through all components, forming a continuous tensile force transmission path to withstand tensile loads under seismic conditions. The flexible connector 7 is also built into the connection channel inside the hollow screw 3 and the ball joint base 5, isolating it from high temperature and high humidity corrosive media. The oblique connector 9 fits the entire cross section after prestressing and together with the ball joint base 5, it forms a rigid compressive support point.
[0017] In some embodiments of the present invention, one end of the ball joint base 5 is provided with a ball joint connecting groove, and one end of the ball joint steering rod 6 is rotatably connected to the ball joint connecting groove; An annular flange 11 is provided at the end face of the other end of the ball joint base 5, and an annular keyway 12 is provided at the end face of the nut 4 near the ball joint base 5. The annular flange 11 and the annular keyway 12 are adapted to be connected. The annular flange 11 at the end of the ball joint base 5 has a groove structure in the middle, and the inner wall of the groove structure has an internal thread structure that is threaded to the hollow screw 3. A connecting channel is provided between the ball joint connecting groove and the groove structure.
[0018] The ball joint connection groove limits the rotation range of the ball joint steering rod 6 to prevent instability caused by excessive deflection; the threaded interface of the hollow screw 3 connection structure ensures that the hollow screw 3 can be disassembled and maintained; the connection channel ensures that the flexible connector 7 is straight and unobstructed, avoiding stress loss caused by multiple bends.
[0019] In some embodiments of the present invention, the sleeve 2, nut 4 and ball joint base 5 are configured as cylindrical structures, and the sleeve 2, nut 4 and ball joint base 5 have the same diameter.
[0020] Sleeve 2, nut 4, and ball joint base 5 have the same outer diameter, eliminating stress concentration caused by abrupt changes in cross-section, and the load is evenly distributed along the cylindrical surface under compressive conditions; the standardized diameter is adapted to the pre-embedded sleeve hole diameter of the nuclear island, eliminating the need for on-site hole enlargement; the cylindrical keyway positioning ensures rapid alignment and assembly of multiple components.
[0021] In some embodiments of the present invention, the sleeve 2 has an axial cavity structure inside, a hollow screw 3 is provided inside the cavity structure, one end of the hollow screw 3 is provided with an end plate, a plurality of screw protrusions are provided circumferentially outside the end plate, and a plurality of sleeve keyways are provided axially on the inner wall of the cavity structure, and the plurality of screw protrusions are adapted to the plurality of sleeve keyways. The screw protrusion structure engages with the sleeve keyway to resist seismic torque loads, and the end plate limiting design prevents the hollow screw from axially dislodging.
[0022] In some embodiments of the present invention, the flexible connector 7 is provided with anchor heads 8 at both ends. The flexible connector 7 is arranged to pass through the hollow screw 3, the ball joint base 5, the ball joint steering rod 6, a plurality of oblique connectors 9 and adjusting connectors 10 along the axial direction. The anchor heads 8 at both ends of the flexible connector 7 are respectively arranged at the ends of the hollow screw 3 that are far apart. Anchor head 8 is snapped into the end of hollow screw rod 3 to form a closed tensioning system; the overall prestress level can be adjusted synchronously by rotating the double-ended nut 4.
[0023] In some embodiments of the present invention, one end of the oblique connector 9 is provided with a plurality of flange structures, and the other end of the oblique connector 9 is provided with a plurality of groove structures. The flange structures and groove structures are adapted to each other, and the plurality of oblique connectors 9 are connected end to end along the axial direction through the flange structures and groove structures. The flange is embedded in the groove to form a multi-tooth meshing, which improves the shear bearing capacity.
[0024] In some embodiments of the present invention, the two ends of the adjusting connector 10 are connected to the oblique connector 9 and the ball joint steering rod 6 respectively by means of keyway connection along the axial direction of the oblique connector 9; the adjusting connector 10 is provided with a first adjusting component and a second adjusting component, and the first adjusting component and the second adjusting component are connected by means of keyway connection along the axial direction perpendicular to the oblique connector 9.
[0025] The first adjusting component extends and retracts along the oblique axis to compensate for the deviation in the spacing of the reinforcing bars, while the second adjusting component moves vertically along the axis to correct the elevation difference of the reinforcing bars. The orthogonal keyways interlock to form a spatial grid structure, which suppresses the accumulation of displacement during the service life.
[0026] In some embodiments of the present invention, the ball joint steering rod 6 is connected to the oblique connector 9 and the adjusting connector 10 via a keyway connection. While ensuring a stable connection between the ball joint steering rod 6, the oblique connector 9, and the adjusting connector 10, the keyway connection method directs the pressure of the oblique connector 9 to the curved surface of the ball joint base 5.
[0027] In some embodiments of the present invention, the flexible connector 7 is configured as a prestressed steel wire or steel strand. This ensures the overall irradiation stability of the connection structure and improves fatigue life.
[0028] In a second aspect of the invention, a connection method for a flexible adjustable connection structure used in nuclear island civil engineering is provided, comprising: Based on the actual situation, the sleeve 2, hollow screw 3, nut 4, ball joint base 5, ball joint steering rod 6, oblique connector 9 and adjusting connector 10 are prefabricated; Assemble the sleeve 2, hollow screw 3, nut 4, ball joint base 5, ball joint steering rod 6, oblique connector 9 and adjusting connector 10 according to the set assembly sequence. An anchor head 8 is set at one end of the flexible connector 7, and the other end of the flexible connector 7 is sequentially passed through the hollow screw 3, nut 4, ball joint base 5, ball joint steering rod 6 at one end, as well as several oblique connectors 9 and adjusting connectors 10 in the middle, and the ball joint base 5, nut 4 and hollow screw 3 at the other end. An anchor head 8 is installed at the other end of the flexible connector 7 to engage the hollow screw 3, thus completing the component assembly. During construction, first connect the steel reinforcement structure 1 on both sides to the sleeve 2, then rotate the ball hinge steering rod 6 to an angle that ensures the entire cross section of the inclined connector 9 fits tightly, and set a certain number of adjusting connectors 10 at the inclined connector 9. Finally, tighten the flexible connector 7 by rotating the nuts 4 on both sides to complete the installation of the connection structure.
[0029] The present invention provides a flexible adjustable connection structure and connection method for nuclear island civil engineering. Through the coordinated connection of a ball joint assembly, a connecting assembly, and a flexible connector 7, it achieves a breakthrough in nuclear island steel reinforcement connection technology. Specifically: It has a large deviation adaptive capability. The ball joint steering rod 6 can rotate freely in the ball joint base 5 to compensate for the axial angle deviation of the steel structure 1. The length can be adjusted by combining the adjusting connector 10 and the oblique connector 9 to adapt to different steel bar spacing. The hollow screw 3 can rotate and extend through the nut 4 to actively correct the axial position deviation. The flexible connector 7 runs through all components to form a continuous tensile system, efficiently transmitting seismic tensile force. The oblique connector 9 fits the entire cross section after prestressing and forms a rigid compressive support with the ball joint base 5. The sleeve 2 and the hollow screw 3, and the oblique connector 9 are connected by keyways to provide shear and torsional bearing capacity. The flange and groove structures enable the rapid expansion and interlocking of the oblique connector 9; the double nuts 4 rotate synchronously to tighten the flexible connector 7, quantitatively controlling the prestress level; the ball joint steering rod 6 freely rotates and locks, simplifying the on-site alignment process.
[0030] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.
Claims
1. A flexible adjustable connection structure for a nuclear island civil engineering, characterized by, The system includes a ball joint assembly, which comprises two ball joint bases. The opposite ends of the two ball joint bases are respectively connected to ball joint steering rods. The two ball joint steering rods are connected to each other by a plurality of oblique connectors and adjusting connectors. Nuts are respectively connected to the far ends of the two ball joint bases. Both nuts are connected to sleeves at the ends away from the ball joint base. Hollow screws are provided inside the two sleeves. The two hollow screws extend axially out of the sleeves and are respectively connected to the nuts. The ends of the two sleeves away from the nuts are respectively connected to the steel reinforcement structure. The two hollow screws, the two ball joint bases, the two ball joint steering rods, and the several oblique connecting parts and adjusting connecting parts are connected by flexible connecting parts in the middle.
2. The flexible adjustable connection structure for nuclear island civil engineering as described in claim 1, characterized in that, One end of the ball joint base is provided with a ball joint connecting groove, and one end of the ball joint steering rod is rotatably connected to the ball joint connecting groove. The other end face of the ball joint base is provided with an annular flange, and the end face of the nut near the ball joint base is provided with an annular keyway. The annular flange and the annular keyway are adapted to be connected. The annular flange at the end of the ball joint base has a groove structure in the middle, and the inner wall of the groove structure has an internal thread structure that is threaded to the hollow screw. A connecting channel is provided between the ball joint connecting groove and the groove structure.
3. The flexible adjustable connection structure for nuclear island civil engineering as described in claim 1, characterized in that, The sleeve, nut, and ball joint base are configured as cylindrical structures, and the sleeve, nut, and ball joint base have the same diameter.
4. The flexible adjustable connection structure for nuclear island civil engineering as described in claim 1, characterized in that, The sleeve has a hollow screw inside along the axial direction. One end of the hollow screw has an end plate. The end plate has a plurality of screw protrusions circumferentially arranged outside. The inner wall of the sleeve has a plurality of sleeve keyways along the axial direction. The plurality of screw protrusions are adapted to the plurality of sleeve keyways.
5. The flexible adjustable connection structure for nuclear island civil engineering as described in claim 4, characterized in that, The flexible connector is axially arranged through two hollow screws, two ball joint bases, two ball joint steering rods, several oblique connectors and adjusting connectors. The end plates of the two hollow screws have through holes in the middle along the axis. The two ends of the flexible connector pass through the through holes on both sides and are anchored at the ends to the outside of the through holes.
6. The flexible adjustable connection structure for nuclear island civil engineering as described in claim 1, characterized in that, One end of the oblique connector is provided with several flange structures, and the other end of the oblique connector is provided with several groove structures. The flange structures and groove structures are adapted to each other, and several oblique connectors are connected end to end along the axial direction through the flange structures and groove structures.
7. The flexible adjustable connection structure for nuclear island civil engineering as described in claim 1, characterized in that, The two ends of the adjusting connector are connected to the oblique connector and the ball joint steering rod respectively by keyway connection along the axial direction of the oblique connector; the adjusting connector is provided with a first adjusting component and a second adjusting component, and the first adjusting component and the second adjusting component are connected by keyway connection along the axial direction perpendicular to the oblique connector.
8. The flexible adjustable connection structure for nuclear island civil engineering as described in claim 1, characterized in that, The ball joint steering rod is connected to the oblique connector and the adjusting connector via a keyway connection.
9. A flexible adjustable connection structure for nuclear island civil engineering as described in claim 1, characterized in that, The flexible connector is configured as a prestressed steel wire or steel strand.
10. A connection method for a flexible adjustable connection structure for nuclear island civil engineering as described in any one of claims 1-9, characterized in that, include: Prefabricate the sleeve, hollow screw, nut, ball joint base, ball joint steering rod, oblique connector and adjusting connector according to the actual situation; Assemble the sleeve, hollow screw, nut, ball joint base, ball joint steering rod, oblique connector and adjusting connector according to the set assembly sequence; An anchor head is set at one end of the flexible connector, and the other end of the flexible connector is passed through the hollow screw, nut, ball joint base, ball joint steering rod and several oblique connectors and adjusting connectors in the middle, as well as the ball joint base, nut and hollow screw at the other end. An anchor head is installed at the other end of the flexible connector to snap into the end plate of the hollow screw, and the component assembly is completed. During construction, the steel reinforcement structures on both sides are first connected to the sleeve. Then, the ball hinge steering rod is rotated to an angle that ensures the entire cross-section of the inclined connector fits tightly. A certain number of adjusting connectors are then installed at the inclined connector. Finally, the flexible connectors are tightened by rotating the nuts on both sides to complete the installation of the connection structure.