Flexible adjustable connecting structure for nuclear island civil engineering and connecting method thereof

Abstract

The invention discloses a flexible adjustable connecting structure for nuclear island civil engineering and a connecting method thereof, and belongs to the technical field of nuclear power civil engineering. The flexible adjustable connecting structure comprises a spherical hinge assembly, connecting assemblies are arranged at the two ends of the spherical hinge assembly respectively, and the end, away from the spherical hinge assembly, of each connecting assembly is connected with a steel bar structure; spherical hinge bases are arranged at the two ends of the spherical hinge assembly, the opposite ends of the two spherical hinge bases are connected with spherical hinge steering rods correspondingly, and the two spherical hinge steering rods are connected through a plurality of oblique connecting pieces and adjusting connecting pieces. The connecting assembly comprises a sleeve internally provided with a hollow screw, the hollow screw is connected with a nut, and the sleeve is connected with a steel bar structure. The ends, away from each other, of the two spherical hinge bases are connected with the hollow screw. Flexible connecting pieces are arranged in the middles of the hollow screw rod, the spherical hinge base, the spherical hinge steering rod, the inclined connecting pieces and the adjusting connecting piece for connection. The connecting structure is large in axial and angle tolerance, reliable in tensile and compression resistance and convenient to manufacture and install.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power civil engineering, in particular to a flexible adjustable connecting structure for nuclear island civil engineering and a connecting method thereof. BACKGROUND

[0002] The nuclear island is the core safety barrier of a nuclear power plant, and its civil structure needs to maintain integrity under extreme conditions. The performance of steel bar connection is directly related to the seismic resistance, durability and construction reliability of the overall structure. Currently, it faces three special challenges: First, the mechanical environment is harsh, and it needs to withstand high-cycle fatigue load under design basis earthquake and severe accident earthquake, and resist tensile-compressive alternating stress under accident working conditions; second, the service environment is harsh, and it is exposed to high temperature of 60-200℃, relative humidity of 100% and strong neutron irradiation environment (cumulative flux ≥10^19 nvt) for a long time, which leads to material embrittlement and stress corrosion risk multiplication; third, the construction precision is limited, and modular assembly construction technology is often used in the nuclear island. In order to meet the needs of on-site modular installation, the construction error of steel bar construction is often large, and since the positioning deviation of steel bar in modular construction is significant, it far exceeds the tolerance limit of conventional mechanical connection.

[0003] Based on the above, in the nuclear power civil engineering, the existing nuclear island steel bar connection technology has certain technical problems: Among them, the ordinary mechanical connection method in the nuclear island civil structure is difficult to meet the requirements of ordinary mechanical connection due to the large diameter of the steel bar and the control of the processing and construction precision. In addition, the nuclear island civil structure often uses assembly type structure construction technology, especially when using steel bar cage assembly type method for construction, the coaxiality deviation of steel bar such as axial deviation and angle deviation and spacing deviation is often difficult to control, and the ordinary mechanical connection cannot meet the construction demand, that is, the ordinary mechanical connection method relies on high-precision steel bar centering and cannot adapt to the cumulative deviation of modular construction.

[0004] The welding connection method often has problems such as slow construction progress, large quality fluctuation, brittle heat-affected zone, and residual stress concentration, and there is a great fire hazard in the construction site.

[0005] The binding lap joint method has technical problems such as discontinuous stress transmission, space constraints, i.e. the space cannot meet the length requirement of steel bar lap joint, and poor seismic performance. In addition, in the nuclear island civil structure, the stress of steel bar is complex, and when there is steel bar axial tension or small eccentric tension working condition, the binding lap joint connection cannot guarantee the stability of the connection.

[0006] And the industry attempts to improve the solution does not break through the technical bottleneck, including shape memory alloy connector, high temperature environment, easy superelastic failure, recovery stress decay; hydraulic expansion connection: sensitive to the reinforcement ovality, the on-site reaming qualified rate is insufficient; grouting sleeve, the grouting density fluctuation is big in damp environment and cannot compensate the angle deviation.

[0007] It can be seen that there is a contradiction between construction tolerance and structural reliability at present, that is, the current large deviation adaptability measure significantly weakens the node connection stiffness; the contradiction between tensile and compressive performance synergy, that is, the current ordinary mechanical connection structure is difficult to provide stable compression fulcrum; the contradiction between nuclear environment durability and construction convenience, that is, the radiation resistant material is difficult to be used on site. SUMMARY In view of the problems existing in the prior art, the present application provides a flexible adjustable connection structure for nuclear island civil engineering and a connecting method thereof, which avoids the connection problems caused by traditional mechanical connection, welding, binding lap, grouting sleeve and other traditional connection methods, and has large axial and angular tolerance, reliable tensile and compressive performance, and is convenient to manufacture and install.

[0008] The technical scheme of the present application is as follows: In the first aspect of the present application, a flexible adjustable connection structure for nuclear island civil engineering is provided, which comprises a spherical hinge assembly, the spherical hinge assembly comprises two spherical hinge bases, opposite ends of the two spherical hinge bases are respectively connected with spherical hinge steering rods, and the two spherical hinge steering rods are connected through a plurality of inclined connecting pieces and adjusting connecting pieces; the two spherical hinge bases are respectively connected with nuts at the ends away from each other; The ends of the two nuts away from the spherical hinge bases are respectively connected with sleeves, the two sleeves are respectively provided with hollow screws, the two hollow screws are respectively connected with the nuts along the axial direction and pass out of the sleeves, and the ends of the two sleeves away from the nuts are respectively connected with steel structures; The middle parts of the two hollow screws, the two spherical hinge bases, the two spherical hinge steering rods, the plurality of inclined connecting pieces and the adjusting connecting pieces are respectively connected with flexible connecting pieces.

[0009] In some embodiments of the present application, one end of the spherical hinge base is provided with a spherical hinge connecting groove, and the other end of the spherical hinge steering rod is rotatably connected with the spherical hinge connecting groove; The other end of the spherical hinge base is provided with an annular flange, the end face of the nut close to the spherical hinge base is provided with an annular key groove, and the annular flange and the annular key groove are adaptively connected; The middle part of the annular flange of the end of the spherical hinge base is provided with a groove structure, and the inner wall of the groove structure is provided with an internal thread structure and is threadedly connected with the hollow screw; A connecting channel is arranged between the spherical hinge connecting groove and the groove structure. In some embodiments of the present application, the sleeve, nut and ball joint base are arranged in a cylindrical structure, and the diameter of the sleeve, nut and ball joint base is consistent. In some embodiments of the present application, the inside of the sleeve is provided with a hollow screw along the axial direction, one end of the hollow screw is provided with an end plate, the outside of the end plate is provided with a plurality of screw protrusions in a ring shape, and the inner wall of the sleeve is provided with a plurality of sleeve key grooves along the axial direction, and the plurality of screw protrusions are matched with the plurality of sleeve key grooves. In some embodiments of the present application, the flexible connecting piece is arranged through the two hollow screws, the two ball joint bases, the two ball joint steering rods, the plurality of oblique connecting pieces and the adjusting connecting pieces along the axial direction, the middle part of the end plate of the two hollow screws is provided with a through hole along the axial direction, and the two ends of the flexible connecting piece are respectively passed through the two through holes and then provided with anchor head clamped outside the through hole at the end. In some embodiments of the present application, one end of the oblique connecting piece is provided with a plurality of flange structures, the other end of the oblique connecting piece is provided with a plurality of groove structures, the flange structure is matched with the groove structure, and the plurality of oblique connecting pieces are sequentially connected in a head-to-tail manner along the axial direction through the flange structure and the groove structure. In some embodiments of the present application, the two ends of the adjusting connecting piece are respectively connected with the oblique connecting piece and the ball joint steering rod through the key groove connection along the axial direction of the oblique connecting piece; the adjusting connecting piece is provided with a first adjusting part and a second adjusting part, and the first adjusting part and the second adjusting part are connected through the key groove connection along the direction perpendicular to the axial direction of the oblique connecting piece.

[0010] In some embodiments of the present application, the ball joint steering rod is connected with the oblique connecting piece and the adjusting connecting piece through the key groove connection. In some embodiments of the present application, the flexible connecting piece is arranged as a prestressed steel wire or a steel strand. In the second aspect of the present application, a connecting method of a flexible adjustable connecting structure for a nuclear island civil engineering is provided, comprising: According to the actual situation, the sleeve, hollow screw, nut, ball joint base, ball joint steering rod, oblique connecting piece and adjusting connecting piece are prefabricated; The sleeve, hollow screw, nut, ball joint base, ball joint steering rod, oblique connecting piece and adjusting connecting piece are assembled in a set assembly order; An anchor head is arranged at one end of the flexible connecting piece, and the other end of the flexible connecting piece is sequentially passed through the hollow screw, nut, ball joint base, ball joint steering rod, a plurality of oblique connecting pieces and adjusting connecting pieces in the middle part, and the ball joint base, nut and hollow screw at the other end, and the anchor head is installed at the other end of the flexible connecting piece to clamp the end plate of the hollow screw, so that the assembly is completed; During construction, first, the steel reinforcement structures on both sides are connected with the sleeve, then the ball hinge steering rod is rotated to an angle that can ensure that the full cross section of the diagonal connecting piece is tightly fitted, a certain number of adjusting connecting pieces are arranged at the diagonal connecting piece, finally, the flexible connecting piece is tightened by rotating the nuts on both sides, and the installation of the connecting structure is completed.

[0011] The one or more technical solutions of the present application have the following beneficial effects: The flexible adjustable connecting structure for nuclear island civil engineering and the connecting method thereof provided by the present application realize a breakthrough in nuclear island steel reinforcement connecting technology through the cooperative connection mode of the ball hinge assembly, the connecting assembly and the flexible connecting piece, and specifically: It has large deviation self-adaptive capability, the ball hinge steering rod rotates freely in the ball hinge base, compensates the axial angle deviation of the steel reinforcement structure, the adjusting connecting piece and the diagonal connecting piece adjust the length in combination, adapts to different steel reinforcement spacings, the hollow screw rod is extended and retracted through the nut rotation, and the axial position deviation is actively corrected; The flexible connecting piece penetrates all components to form a continuous tensile system, efficiently transmits the seismic tension, the diagonal connecting piece is tightly fitted in the full cross section after prestress tightening, forms a rigid compression support point with the ball hinge base, and the sleeve and the hollow screw rod and the diagonal connecting piece are connected through the key groove connection mode to provide shear and torsional carrying capacity; The flange structure and the groove structure realize rapid expansion, assembly and interlocking of the diagonal connecting piece; the double nuts are synchronously rotated to tighten the flexible connecting piece, and the prestress level is quantitatively controlled; the ball hinge steering rod is freely steered and locked, and the on-site alignment process is simplified; The flexible connecting piece is provided as a prestressed steel wire or a steel strand, which ensures the irradiation stability of the connecting structure as a whole and improves the fatigue life. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The figure is a schematic diagram of the overall structure of the flexible adjustable connecting structure for nuclear island civil engineering provided by the embodiment 1 of the present application; Figure 2 The figure is a schematic diagram of the cross section of the sleeve provided by the embodiment 1 of the present application; Figure 3 The figure is a schematic diagram of the cross section of the hollow screw rod provided by the embodiment 1 of the present application; Figure 4 The figure is a schematic diagram of the structure of the anchor head provided at the end of the hollow screw rod provided by the embodiment 1 of the present application; Figure 5 The figure is a schematic diagram of the cross section of the nut provided by the embodiment 1 of the present application; Figure 6 The figure is a schematic diagram of the annular key groove structure on the nut provided by the embodiment 1 of the present application; Figure 7 The figure is a schematic diagram of the cross section of the ball hinge base provided by the embodiment 1 of the present application; 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] Through the above setting, the spherical hinge steering rod 6 in the spherical hinge assembly can rotate in multiple directions to compensate for the axial angle deviation and spacing deviation of the steel bar structure 1, and the combined design of the inclined connecting piece 9 and the adjusting connecting piece 10 can adapt to the steel bar connecting requirements of different spacings by increasing or decreasing the number; The flexible connecting piece 7 penetrates all the components to form a continuous tensile force transmission path to bear the tensile load under the seismic working condition, and the flexible connecting piece 7 is built-in the connecting channel inside the hollow screw rod 3 and the spherical hinge base 5 to isolate the high-temperature and high-humidity corrosive medium; the inclined connecting piece 9 is fully in contact after the prestress is tightened, and together with the spherical hinge base 5, forms a rigid compression support point.

[0017] In some embodiments of the present application, one end of the spherical hinge base 5 is provided with a spherical hinge connecting groove, and one end of the spherical hinge steering rod 6 is rotatably connected with the spherical hinge connecting groove; The other end of the spherical hinge base 5 is provided with an annular flange 11 at the end face, and the screw cap 4 is provided with an annular key groove 12 close to the end face of the spherical hinge base 5, and the annular flange 11 is adaptively connected with the annular key groove 12; The middle part of the annular flange 11 of the end of the spherical hinge base 5 is provided with a groove structure, and the inner wall of the groove structure is provided with an internal thread structure and is threadedly connected with the hollow screw rod 3; The spherical hinge connecting groove and the groove structure are provided with a connecting channel.

[0018] The spherical hinge connecting groove limits the rotation range of the spherical hinge steering rod 6 to prevent instability caused by excessive deflection; the threaded interface of the connecting structure of the hollow screw rod 3 ensures that the hollow screw rod 3 can be disassembled and maintained; and the connecting channel ensures that the flexible connecting piece 7 is straightly penetrated to avoid stress loss caused by multiple bending.

[0019] In some embodiments of the present application, the sleeve 2, the screw cap 4 and the spherical hinge base 5 are provided in a cylindrical structure, and the diameters of the sleeve 2, the screw cap 4 and the spherical hinge base 5 are consistent.

[0020] The outer diameters of the sleeve 2, the screw cap 4 and the spherical hinge base 5 are consistent to eliminate stress concentration caused by cross-section mutation, and the load under compression working condition is uniformly diffused along the cylindrical surface; the standardized diameter is adapted to the pre-buried sleeve hole diameter of the nuclear island, and there is no need to expand the hole on site; the cylindrical key groove positioning ensures quick centering assembly of multiple components.

[0021] In some embodiments of the present application, the inside of the sleeve 2 is provided with a cavity structure along the axial direction, the cavity structure is provided with a hollow screw rod 3, one end of the hollow screw rod 3 is provided with an end plate, the outside of the end plate is provided with a plurality of screw rod protruding structures in a ring shape, the inner wall of the cavity structure is provided with a plurality of sleeve key grooves along the axial direction, and the plurality of screw rod protruding structures are adaptively connected with the plurality of sleeve key grooves. The screw rod protruding structures are engaged with the sleeve key grooves to resist the seismic torque load, and the end plate limiting design prevents the hollow screw rod 3 from being axially pulled out.

[0022] In some embodiments of the present application, the two ends of the flexible connecting piece 7 are provided with anchor heads 8, the flexible connecting piece 7 passes through the hollow screw rod 3, the spherical hinge base 5, the spherical hinge steering rod 6, the plurality of oblique connecting pieces 9 and the adjusting connecting piece 10 in the axial direction, and the anchor heads 8 at the two ends are respectively arranged at the ends away from the hollow screw rod 3. The anchor head 8 is clamped at the end of the hollow screw rod 3, forming a closed tensioning system; the double-end rotating screw nut 4 can synchronously adjust the overall prestress level.

[0023] In some embodiments of the present application, one end of the oblique connecting piece 9 is provided with a plurality of flange structures, the other end of the oblique connecting piece 9 is provided with a plurality of groove structures, the flange structure and the groove structure are matched, and the plurality of oblique connecting pieces 9 are connected in sequence through the flange structure and the groove structure in the axial direction. The flange is embedded in the groove to form multi-tooth engagement, thereby improving the shear bearing capacity.

[0024] In some embodiments of the present application, the two ends of the adjusting connecting piece 10 are connected with the oblique connecting piece 9 and the spherical hinge steering rod 6 through the key groove connection in the axial direction of the oblique connecting piece 9; the adjusting connecting piece 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 through the key groove connection in the direction perpendicular to the axial direction of the oblique connecting piece 9.

[0025] The first adjusting component extends and retracts along the oblique axis to compensate for the deviation of the steel bar spacing, and the second adjusting component moves vertically to the axis to correct the elevation difference of the steel bar, the orthogonal key grooves are interlocked to form a spatial grid structure, and the displacement accumulation during use is inhibited.

[0026] In some embodiments of the present application, the spherical hinge steering rod 6 is connected with the oblique connecting piece 9 and the adjusting connecting piece 10 through the key groove connection. While ensuring the stable connection of the spherical hinge steering rod 6 with the oblique connecting piece 9 and the adjusting connecting piece 10, the key groove connection mode conducts the pressure of the oblique connecting piece 9 to the curved surface of the spherical hinge base 5.

[0027] In some embodiments of the present application, the flexible connecting piece 7 is provided as a prestressed steel wire or a steel strand, thereby ensuring the irradiation stability of the overall connecting structure and improving the fatigue life.

[0028] In the second aspect of the present application, a connecting method of a flexible adjustable connecting structure for nuclear island civil engineering is provided, comprising: According to the actual situation, the sleeve 2, the hollow screw rod 3, the screw nut 4, the spherical hinge base 5, the spherical hinge steering rod 6, the oblique connecting piece 9 and the adjusting connecting piece 10 are prefabricated; Assemble sleeve 2, hollow screw 3, nut 4, ball hinge base 5, ball hinge steering rod 6, inclined connecting piece 9 and adjusting connecting piece 10 in the set assembly order; Anchoring head 8 is arranged at one end of flexible connecting piece 7, and the other end of flexible connecting piece 7 is sequentially threaded through hollow screw 3, nut 4, ball hinge base 5, ball hinge steering rod 6 at one end, and several inclined connecting pieces 9 and adjusting connecting pieces 10 in the middle, and ball hinge base 5, nut 4 and hollow screw 3 at the other end, and anchoring head 8 is installed at the other end of flexible connecting piece 7 to clamp hollow screw 3, and assembly is completed. During construction, first, the steel reinforcement structure 1 is connected with the sleeve 2, then the ball hinge steering rod 6 is rotated to an angle that can ensure that the inclined connecting piece 9 is tightly attached in full section, a certain number of adjusting connecting pieces 10 are arranged at the inclined connecting piece 9, and finally the flexible connecting piece 7 is tightened by rotating the nuts 4 on both sides, and the installation of the connecting structure is completed.

[0029] The flexible adjustable connecting structure for nuclear island civil engineering and the connecting method thereof provided by the application realize a breakthrough in nuclear island steel reinforcement connection technology through the cooperative connection of the ball hinge assembly, the connecting assembly and the flexible connecting piece 7, and specifically: The ball hinge steering rod 6 freely rotates in the ball hinge base 5 to compensate for the axial angle deviation of the steel reinforcement structure 1, the adjusting connecting piece 10 and the inclined connecting piece 9 are combined to adjust the length, which is suitable for different steel reinforcement spacings, and the hollow screw 3 is rotated and expanded through the nut 4 to actively correct the axial position deviation; The flexible connecting piece 7 penetrates all the components to form a continuous tensile system, efficiently transmits seismic tension, the inclined connecting piece 9 is tightly attached in full section after prestress tightening, and forms a rigid compression support point with the ball hinge base 5, and the sleeve 2 and the hollow screw 3 and the inclined connecting piece 9 are connected through a key groove connection to provide shear and torsional bearing capacity; The flange structure and the groove structure realize quick expansion, assembly and interlocking of the inclined connecting piece 9, the double nuts 4 are synchronously rotated to tighten the flexible connecting piece 7, the prestress level is quantitatively controlled, the ball hinge steering rod 6 is freely steered and locked, and the on-site alignment process is simplified.

[0030] The above describes the specific embodiments of the application in combination with the drawings, but is not a limitation on the protection scope of the application, and those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the application without creative labor are still within the protection scope of the application.

Claims

1. A flexible adjustable connection structure for nuclear island civil engineering, characterized in that, 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.

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