Outside bolt inside anchor type flange connection joint

Abstract

The application discloses an outer-bolt and inner-anchor type flange connecting node and belongs to the technical field of steel structure engineering. The node aims to solve the technical problems that the traditional flange connection is difficult to realize the equal-strength connection with the component for the large-diameter thick-wall steel pipe and the existing node connection is weak in rigidity and is eccentric in stress. Technical scheme points of the node include a steel pipe end plate coaxially welded with a steel pipe to be spliced, the inner diameter of the ring plate structure is matched with the outer diameter of the sleeve, the sleeve is penetrated into the welding on the other side of the end plate and is provided with an internal thread; a mounting ring plate is fixedly connected with a screw rod through a center hole, the screw rod is provided with an external thread matched with the internal thread of the sleeve, and the mounting ring plate is provided with a second bolt hole; through rotating the screw rod into the two symmetrical sleeves, the first bolt holes at the two ends are correspondingly communicated with the second bolt hole, and high-strength bolts are penetrated into the first bolt holes and the second bolt hole to realize fastening. The node is mainly used for the splicing of the steel pipe in large-scale steel structure engineering and can realize the standardized production, rapid installation and detachable and repeated use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure engineering. More particularly, the present application relates to a flange connection node of external bolt and internal anchor type. BACKGROUND

[0002] In the field of steel structure engineering, steel tube structures are widely used in large-span space structures, high-rise buildings, industrial plants and bridge towers due to their excellent mechanical properties and construction efficiency. Reliable connection between steel tubes is a key link to ensure the safety of the overall structure. Currently, field splicing of steel tube structures mainly adopts welding and flange connection.

[0003] Welded connection can achieve equal-strength connection of the node and the member material, and has high stiffness and sealing performance. However, the welding operation has high requirements for the operating environment and the skill level of the technicians, and the quality of field welding is not easy to guarantee. More importantly, welding is a permanent connection that cannot be disassembled, which cannot meet the engineering needs of some repeated disassembly or reversible construction.

[0004] As a detachable mechanical connection method, flange connection solves the problem of convenience to some extent. However, in practical application, it is found that for large-diameter thick-walled steel tubes subjected to large tensile force or dynamic load, the traditional flange connection has obvious limitations. The load transfer path depends on the pre-tightening force of the bolt and the friction force of the flange contact surface. When the node is subjected to axial tension, the load is mainly transmitted through the bolt rod. The bolt rod itself is an elongated rod, and its tensile stiffness is limited, which is prone to significant elastic elongation under high stress, resulting in increased node deformation and difficulty in achieving equal-strength connection with the steel tube member. In addition, to meet the strength requirements, a large number of bolts or thicker flange plates are needed, which will significantly increase the weight and material cost of the node, and also make the on-site installation more difficult.

[0005] Therefore, there is an urgent need in engineering practice for a new type of steel tube connection node, which should not only meet the stringent requirements of connection strength of large-diameter thick-walled steel tubes under high load conditions and achieve equal-strength or near-equal-strength connection performance with the member, but also retain the convenience of detachable connection, simplify the on-site installation operation, reduce the difficulty of alignment adjustment, and improve the construction efficiency and accuracy. SUMMARY

[0006] An object of the present application is to provide a flange connection node of external bolt and internal anchor type for splicing of steel tubes in large-scale steel structure engineering, which can achieve standardized production, rapid installation and detachable reuse.

[0007] In order to achieve these objects and other advantages of the present application, according to one aspect of the present application, a flange connection node of external bolt and internal anchor type is provided, which comprises a steel tube end plate, a sleeve, a screw rod and a mounting ring plate.

[0008] One side of the steel pipe end plate is coaxially welded with the steel pipe to be spliced, the steel pipe end plate is a ring plate structure, the inner diameter of which matches the outer diameter of the sleeve, the sleeve is coaxially penetrated into the other side of the steel pipe end plate and fixedly connected therewith, a plurality of first bolt holes are formed in the circumferential direction of the steel pipe end plate, and an inner thread is arranged on the inner side wall of the sleeve.

[0009] The mounting ring plate is provided with a mounting ring plate center hole along the axis, the inner diameter of which matches the outer diameter of the screw rod, the screw rod is coaxially penetrated into the mounting ring plate and fixedly connected therewith, an outer thread matched with the inner thread is arranged on the outer side wall of the screw rod, and a plurality of second bolt holes are formed in the circumferential direction of the mounting ring plate.

[0010] The two ends of the screw rod are coaxially matched and screwed into the sleeves of the two mutually symmetrical steel pipe end plates, and the first bolt holes on the two steel pipe end plates and the second bolt holes on the mounting ring plate are correspondingly communicated, and high-strength bolts are penetrated into the correspondingly communicated first bolt holes and second bolt holes to realize connection and fastening.

[0011] Preferably, a plurality of rib plates are vertically welded in the circumferential direction between the end of the steel pipe end plate and the outer side wall of the steel pipe to be spliced.

[0012] Preferably, the steel pipe to be spliced, the steel pipe end plate and the sleeve are fixedly connected into one body by welding.

[0013] Preferably, the screw rod and the mounting ring plate are fixedly connected into one body by welding.

[0014] Preferably, a plurality of interval tooth plates are uniformly distributed in the circumferential direction of the outer side wall of the screw rod, the length of the interval tooth plate in the axial direction of the screw rod matches the thickness of the mounting ring plate, the interval tooth plate is not arranged in full length, a tooth-shaped groove matched with the plurality of interval tooth plates is arranged in the circumferential direction in the mounting ring plate center hole, and the screw rod and the mounting ring plate are fixedly connected into one body by matched interval tooth plate and tooth-shaped groove.

[0015] Preferably, the cooperation of the interval tooth plate and the tooth-shaped groove allows the mounting ring plate to rotate in one direction relative to the screw rod.

[0016] When the mounting ring plate rotates in the first direction, the interval tooth plate and the tooth-shaped groove are engaged, and the screw rod is driven to rotate synchronously.

[0017] When the mounting ring plate rotates in the second direction opposite to the first direction, the interval tooth plate and the tooth-shaped groove are disengaged, and the mounting ring plate can rotate independently, and the rotation angle of the mounting ring plate is consistent with the central included angle between two adjacent second bolt holes in the circumferential direction.

[0018] Preferably, the pitch of the interval tooth plate is coordinated with the pitch of the first bolt hole and the second bolt hole.

[0019] Preferably, the plurality of spacer tooth plates are all trapezoidal tooth structures with a tooth tip angle of 60-90°.

[0020] The present application at least includes the following advantages: the present application provides an outer bolt and inner anchor type flange connection node, the sleeve is built-in in the end plate and welded to form a whole, then the screw rod is screwed into the sleeve to realize the pull connection, finally the high-strength bolt is fastened to form the force transmission mechanism combined with the inner anchor and the outer bolt, which significantly enhances the bearing capacity and stiffness of the node in the tensile state, so that the connection node can reach the strength level close to the steel pipe component, while the detachability is reserved. By adding the rib plate between the end plate and the outer wall of the steel pipe, the stress of the node area is more effectively dispersed and transmitted to the steel pipe body, thereby improving the overall stiffness and bending resistance of the node. The components are connected as a whole by welding, which ensures the connection strength and integrity of the node. The cooperation design of the spacer tooth plate and the tooth-shaped groove allows controllable one-way relative rotation, solves the problem of bolt hole misalignment during installation, the specific working mechanism allows independent adjustment of the installation ring plate alignment after the screw rod is tightened, and the coordinated design of the tooth pitch and the hole pitch realizes mechanical positioning, which significantly improves the installation precision and efficiency. The trapezoidal tooth shape with a specific angle optimizes the mechanical properties of the tooth root, improves the shear resistance and wear resistance, and ensures the long-term use reliability of the mechanism.

[0021] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following description, and will be appreciated by those skilled in the art upon reading and understanding the following specification. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Structure diagram of the outer bolt and inner anchor type flange connection node described in one technical solution of the present application Figure 1 ;

[0023] Figure 2 Structure diagram of the outer bolt and inner anchor type flange connection node described in one technical solution of the present application Figure 2 ;

[0024] Figure 3 Structure diagram of the steel pipe end plate described in one technical solution of the present application Figure 1 ;

[0025] Figure 4 Structure diagram of the steel pipe end plate described in one technical solution of the present application Figure 2 ;

[0026] Figure 5 Structure diagram of the screw rod and installation ring plate described in one technical solution of the present application Figure 1 ;

[0027] Figure 6A structure diagram of a screw rod and a mounting ring plate according to one of the technical solutions of the present application Figure 2 ;

[0028] Figure 7 A structure diagram of a flange connection node of an outer bolt and inner anchor type according to another of the technical solutions of the present application

[0029] Figure 8 A structure diagram of a screw rod according to another of the technical solutions of the present application

[0030] Figure 9 A structure diagram of a mounting ring plate according to another of the technical solutions of the present application DETAILED DESCRIPTION

[0031] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can implement the present application according to the description.

[0032] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0033] It should be noted that the experimental methods in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial channels unless otherwise specified.

[0034] As shown in Figures 1-6 , the present application provides a flange connection node of an outer bolt and inner anchor type, comprising a steel pipe end plate 1, a sleeve 2, a screw rod 3 and a mounting ring plate 4.

[0035] One side of the steel pipe end plate 1 is coaxially welded with a steel pipe to be spliced, the steel pipe end plate 1 is a ring plate structure, the inner diameter of which matches the outer diameter of the sleeve 2, the sleeve 2 is coaxially inserted into and fixedly connected with the other side of the steel pipe end plate 1, the steel pipe end plate 1 is provided with a plurality of first bolt holes 11 along the circumference, and the inner side wall of the sleeve 2 is provided with an internal thread 22.

[0036] The mounting ring plate 4 is provided with a mounting ring plate center hole 42 along the axis, the inner diameter of which matches the outer diameter of the screw rod 3, the screw rod 3 is coaxially inserted into and fixedly connected with the mounting ring plate 4, the outer side wall of the screw rod 3 is provided with an external thread 31 matched with the internal thread 22 for screwing, and the mounting ring plate 4 is provided with a plurality of second bolt holes 41 along the circumference.

[0037] The two ends of the screw rod 3 are coaxially screwed into the sleeves 2 of the two mutually symmetrical steel pipe end plates 1, and the first bolt holes 11 on the two steel pipe end plates 1 and the second bolt holes 41 on the mounting ring plate 4 are correspondingly communicated, and high-strength bolts 5 are inserted into the correspondingly communicated first bolt holes 11 and second bolt holes 41 to realize connection and fastening.

[0038] In the above technical solution, the outer bolt inner anchor type flange connection node comprises a steel pipe end plate 1, a sleeve 2, a screw rod 3 and a mounting ring plate 4. The steel pipe end plate 1 can be an annular steel plate made of low-carbon alloy steel, and the material thereof can be selected from Q345B or Q355B grades. The sleeve 2 can be a cylindrical component made of medium-carbon steel, and the material thereof can be selected from 45 steel. The inner diameter of the steel pipe end plate 1 and the outer diameter of the sleeve 2 adopt an interference fit, and the fit tolerance can be selected from H7 / k6 grade. During assembly, the sleeve 2 is first pressed into one side of the steel pipe end plate 1, and then continuous circumferential fillet welds are welded, and the weld height can be controlled in the range of 6-10 mm. The steel pipe end plate 1 is uniformly provided with bolt holes along the circumference, the hole diameter is 1-2 mm larger than the nominal diameter of the high-strength bolt 5, and the hole pitch is 3-4 times the hole diameter. The sleeve 2 is provided with a sleeve center hole 21 along the axis, and the steel pipe end plate 1 is provided with a steel pipe end plate center hole 12 along the axis.

[0039] The mounting ring plate 4 can be an annular steel plate made of the same material as the steel pipe end plate 1, and the screw rod 3 can be a double-headed stud made of alloy structural steel, and the material thereof can be selected from 40Cr or 42CrMo. The screw rod 3 and the mounting ring plate 4 are connected by welding, and the weld penetration can be controlled in the range of 3-5 mm. The mounting ring plate center hole 42 has an interference fit with the outer diameter of the screw rod 3, and the fit tolerance can be selected from H7 / h6. The bolt holes provided on the mounting ring plate 4 correspond to the bolt holes on the steel pipe end plate 1, and the hole diameter tolerance is controlled at H13 grade.

[0040] The wall thickness t of the sleeve 2 c is proportional to the wall thickness t of the connected steel pipe p , specifically t c =k1×t p ; the proportional coefficient k1 is an empirical constant based on a large number of mechanical analysis and experimental verification, and the value range is 0.5-0.8. This ensures that the sleeve 2 has sufficient strength to participate in force, and the wall thickness will neither be too thin (resulting in insufficient strength or welding burnout) nor be too thick (resulting in poor economy and excessive welding residual stress). The diameter d s of the screw rod 3 satisfies the formula d s =k2×D p ; wherein D p is the outer diameter of the connected steel pipe, and the proportional coefficient k2 is another key empirical constant, and the value range is 0.08-0.12. This formula directly relates the size of the node core force transmission element (screw rod 3) to the component size, ensuring that the tensile stiffness of the screw rod 3 matches the tensile stiffness of the steel pipe, which is the core design criterion to achieve the goal of “equal strength connection”. The thickness t e of the steel pipe end plate 1 satisfies the formula t e =k3×t pThe value of the proportional coefficient k3 is in the range of 1.2-1.5. The formula guarantees that the flange end plate has sufficient out-of-plane stiffness, effectively resists bending deformation when in tension, ensures uniform pressure transmission to the gasket, and provides stable support for the bolts.

[0041] During overall assembly, the screw rod 3 is first screwed into the internal thread 22 of one side sleeve 2, and then the sleeve 2 of the other side steel pipe end plate 1 is aligned with the screw rod 3, and the screw rod 3 is gradually screwed in by rotating the mounting ring plate 4. When the contact surfaces of the two steel pipe end plates 1 and the mounting ring plate 4 are tightly fitted, the angle of the mounting ring plate 4 is adjusted to align the bolt holes, and finally the high-strength bolts 5 are inserted and fastened according to the specified torque value. The high-strength bolts 5 can be selected as hexagonal head bolts with performance grade of 8.8 or 10.9, and the torque value can be determined according to the bolt specifications and material strength, generally controlled in the range of 200-800 Nm.

[0042] The outer bolt and inner anchor type flange connection node achieves multiple beneficial effects through unique structural design. The node adopts the method of sleeve 2 built-in and welded with steel pipe end plate 1, forming a stable inner anchor structure, which significantly improves the axial tensile stiffness and carrying capacity of the node, enabling the connection strength to reach a level similar to the steel pipe body. At the same time, through the thread cooperation of the screw rod 3 and the sleeve 2, the adjustability of the node length is realized, providing convenience for on-site installation. In terms of stress performance, the node creates a double transmission path. The thread connection of the screw rod 3 and the sleeve 2 bears the main tension, while the peripheral high-strength bolt 5 group provides additional fastening force and shear resistance. This clear division of labor in the force transmission mechanism enables the node to maintain stable mechanical properties under various load conditions. The components of the node are designed with standardized dimensions, ensuring uniformity and reliability of stress. During installation, the node shows good construction adaptability. The thread cooperation of the screw rod 3 and the sleeve 2 enables the node to have self-centering function, reducing the installation precision requirement. The mounting ring plate 4 and the bolt holes on the steel pipe end plate 1 are arranged at equal intervals, and the hole diameter is accurately calculated, which not only ensures the smooth insertion of the bolts, but also ensures sufficient contact area. The tightening sequence and torque value of the high-strength bolts 5 are clearly specified, ensuring the stability of the installation quality. The node also has good disassembly and reusability. By loosening the high-strength bolts 5 and rotating the screw rod 3, the node can be easily disassembled, and the components will not be permanently deformed after disassembly, allowing for repeated use. This feature is particularly suitable for engineering scenarios that require temporary assembly or late-stage adjustment, effectively improving material utilization. In terms of manufacturing process, the components of the node can be produced by conventional machining methods, without the need for special equipment or complex processes. The steel pipe end plate 1 can be cut by flame cutting or plasma cutting, the sleeve 2 can be machined from seamless steel pipe, and the screw rod 3 can be machined by standard thread processing technology. This manufacturing convenience is conducive to ensuring product quality stability and the feasibility of mass production.

[0043] In another technical solution, a plurality of rib plates 6 are vertically welded in the circumferential direction between the end of the steel pipe end plate 1 and the outer side wall of the steel pipe to be spliced.

[0044] In the above technical solution, the rib plate 6 can be made of low-carbon structural steel plate, and the material can be selected from Q235B or Q345B grades. The shape of the rib plate 6 can be selected as a right triangle or a trapezoid, the thickness can be set to 8-20 mm, and the height can be controlled within the range of 80-150 mm. The rib plate 6 is uniformly arranged along the circumferential direction of the back surface of the steel pipe end plate 1, and the number can be determined according to the pipe diameter, which can be usually set to 4-12. One right angle edge of the rib plate 6 is vertically welded with the back surface of the steel pipe end plate 1, and the other right angle edge is welded with the outer wall of the steel pipe to be spliced.

[0045] In terms of welding process, the connection between the rib plate 6 and the steel pipe end plate 1 and the steel pipe to be spliced can adopt manual arc welding or gas shielded welding. The form of the weld can be selected as a double fillet weld, and the leg size can be controlled to 6-10 mm. Symmetrical welding sequence should be adopted during welding to reduce welding deformation. After welding, the weld should be subjected to appearance inspection and non-destructive testing to ensure that the weld quality meets the requirements of relevant standards. The weld length of the rib plate 6 connected with the steel pipe end plate 1 should be not less than half of the height of the rib plate 6.

[0046] The working process of the structure is: when the node bears load, the rib plate 6 can effectively transmit the force received by the steel pipe end plate 1 to the pipe body of the steel pipe to be spliced. The rib plate 6 constrains the deformation of the steel pipe end plate 1 relative to the steel pipe through its rigidity in the plane, improving the overall stability of the node. When a bending moment is applied, the rib plate 6 can provide additional bending stiffness, reducing the stress concentration phenomenon at the root of the steel pipe end plate 1. By reasonably setting the size and number of the rib plate 6, the stress of the node can be more uniform, and the local stress can be avoided.

[0047] This kind of connection node with rib plate 6 can improve the overall stiffness and carrying capacity of the node, and is particularly suitable for working conditions that bear large bending moments or dynamic loads. The addition of the rib plate 6 enhances the local stability of the node area and reduces the deformation possibility of the steel pipe end plate 1. At the same time, this structure maintains the detachable nature of the node and does not affect the realization of the main connection function. The addition of the rib plate 6 makes the force flow transmission smoother, and improves the stress performance of the node.

[0048] In another technical solution, the steel pipe to be spliced, the steel pipe end plate 1 and the sleeve 2 are fixedly connected into one body by welding.

[0049] In the technical solution, the welding method can be selected from common welding processes such as manual arc welding, carbon dioxide gas shielded welding or submerged arc welding. The welding material can be selected from welding rods or welding wires that match the strength of the base material. For the steel pipe end plate 1 and the sleeve 2 made of Q345B material, the E50 series welding rod or the ER50-6 welding wire can be selected. The welding position is located at the butt joint circumferential weld of the steel pipe end plate 1 and the steel pipe to be spliced, and the circumferential fillet weld between the sleeve 2 and the inner hole of the steel pipe end plate 1. Before welding, the groove needs to be cleaned to remove oil stains and rust, and preheating treatment is required according to the requirements. The preheating temperature can be controlled at 120-150 degrees Celsius.

[0050] The welding process parameters are determined according to the plate thickness and material grade. The welding current can be set to 180-280 amperes, and the arc voltage can be controlled between 22-30 volts. The welding speed is kept within a certain range, which can be controlled at 150-250 mm / min for manual welding and appropriately increased for automatic welding. The size of the welding leg is determined according to the thickness of the connecting piece. For steel plates with a thickness of 20-50 mm, the welding leg size can be set to 8-12 mm. The interlayer temperature needs to be controlled during welding, and the maximum temperature should not exceed 250 degrees Celsius.

[0051] After welding, the weld quality needs to be inspected, including visual inspection, non-destructive testing and mechanical property testing. The visual inspection requires that the weld surface should be free of cracks, pores, slag inclusions and other defects, and the weld reinforcement should be controlled within 0-3 mm. Non-destructive testing can be performed using ultrasonic flaw detection or radiographic testing methods. The detection ratio is determined according to the importance of the structure, and important welds can be required to be 100% detected. Mechanical property testing can be performed by sampling for tensile testing and bending testing to verify that the weld strength is not lower than the standard value of the base material.

[0052] This welding connection method makes the steel pipe to be spliced, the steel pipe end plate 1 and the sleeve 2 form a whole stress unit, improving the integrity and stiffness of the joint. Through welding connection, the effective transmission of load between components is ensured, and the loosening problem that may occur in bolt connection is avoided. At the same time, the welding connection has good sealing performance and fatigue resistance, and is suitable for working conditions under dynamic load. Although this connection method is not detachable, it provides higher connection reliability and stability.

[0053] In another technical solution, the screw rod 3 and the mounting ring plate 4 are fixedly connected as a whole by welding.

[0054] In the above technical solution, the welding method can be selected from common welding processes such as manual arc welding, tungsten argon arc welding, or gas shielded welding. The welding material can be selected from welding rods or welding wires that match the strength of the base material. For the 40Cr material screw rod 3 and the Q355B material mounting ring plate 4, E5015 welding rods or ER50-6 welding wires can be selected. The welding position is located at the contact area between the end of the screw rod 3 and the center hole 42 of the mounting ring plate, and adopts a full circumferential fillet weld form. Before welding, the welding site needs to be cleaned to remove oil stains and rust, and the screw rod 3 needs to be preheated, with the preheating temperature controlled within the range of 150 to 200 degrees Celsius.

[0055] The welding joint design adopts a fillet weld form, and the weld leg size is determined according to the thickness of the component. For screw rods 3 with diameters of 30 to 60 mm, the weld leg size can be set to 6 to 10 mm. The welding current can be set to the range of 160 to 240 amperes, and the arc voltage can be controlled between 22 to 28 volts. The welding speed is kept within an appropriate range, which can be controlled at 100 to 200 mm / min for manual welding. The interlayer temperature needs to be controlled during welding, with the maximum temperature not exceeding 300 degrees Celsius. After welding is completed, slow cooling treatment is required to prevent welding cracks.

[0056] The welding quality inspection includes visual inspection, non-destructive testing, and mechanical property testing. The visual inspection requires that the weld surface be uniform and smooth, without cracks, pores, undercut, etc., and the weld reinforcement be controlled within the range of 0 to 2 mm. Non-destructive testing can be performed using magnetic particle testing or ultrasonic testing methods, with 100% detection of important connection parts. Mechanical property testing can be performed by sampling for tensile testing and impact testing to verify that the strength of the welded joint is not less than 90% of the base material standard value. Macroscopic metallographic examination is also required to confirm that the weld penetration reaches 3 to 5 mm to ensure the connection strength.

[0057] This welding connection method makes the screw rod 3 and the mounting ring plate 4 form a whole force unit, ensuring that they can work together when subjected to tension. Through welding connection, the problems of loosening and thread slipping that may occur in threaded connections are avoided, improving the reliability of the connection. The welded joint has good fatigue performance and can withstand dynamic load. Although this connection method is not detachable, it provides higher connection stiffness and stability, and is suitable for working conditions with high connection reliability requirements. This connection method is simple to construct and easy to control the quality, which is beneficial to ensure the overall quality of the project.

[0058] As Figures 7-9As shown, in another technical solution, the outer side wall of the screw 3 is uniformly distributed with a plurality of interval tooth plates 32 in the circumferential direction, the length of the interval tooth plate 32 in the axial direction of the screw 3 matches the thickness of the mounting ring plate 4, and the interval tooth plate 32 is not provided in full length, and the tooth-shaped groove 43 matched with the plurality of interval tooth plates 32 is provided in the circumferential direction in the center hole 42 of the mounting ring plate, and the screw 3 and the mounting ring plate 4 are fixedly connected into one body through the matched interval tooth plate 32 and the tooth-shaped groove 43.

[0059] In the above technical solution, the interval tooth plate 32 can be made of 40Cr or 42CrMo alloy structural steel, the tooth shape can be selected as trapezoidal tooth or rectangular tooth, and the tooth top angle can be set to 60-90 degrees. The interval tooth plate 32 is uniformly distributed along the outer periphery of the screw 3, and the number can be determined according to the diameter of the screw 3, and generally 4-8 interval tooth plates 32 can be provided. The tooth height can be controlled between 3-6 mm, and the tooth pitch is designed as an arc length corresponding to the center included angle of the adjacent second bolt hole 41 on the mounting ring plate 4, and generally can be set to 15-30 mm. The connection between the interval tooth plate 32 and the screw 3 body can be processed by integral milling or split processing and welding. When welding, the symmetrical welding process is adopted to reduce thermal deformation.

[0060] The tooth-shaped groove 43 in the center hole 42 of the mounting ring plate can be processed and formed by a numerical control milling machine, and the depth of the tooth-shaped groove 43 can be set to 1.5-2 times the tooth height, and generally controlled in the range of 5-10 mm. The cooperation between the tooth-shaped groove 43 and the interval tooth plate 32 adopts a clearance fit, and the single-side clearance can be controlled between 0.1-0.3 mm. The tooth shape angle of the tooth-shaped groove 43 is consistent with the tooth shape angle of the interval tooth plate 32, and the tolerance is controlled within ±1 degree. The mounting ring plate 4 can be made of Q355B steel plate, and the thickness is determined according to the stress requirement, and generally can be set to 20-40 mm.

[0061] When assembling, first, the mounting ring plate 4 is sleeved into the screw 3 along the axial direction, and the interval tooth plate 32 is preliminarily aligned with the tooth-shaped groove 43. Then, the mounting ring plate 4 is rotated, and the interval tooth plate 32 slides into the tooth-shaped groove 43. When torque needs to be transmitted, the mounting ring plate 4 is rotated in the first direction, the interval tooth plate 32 and the tooth-shaped groove 43 are engaged to drive the screw 3 to rotate synchronously. When the angle of the mounting ring plate 4 needs to be adjusted, it is rotated in the opposite direction, the interval tooth plate 32 and the tooth-shaped groove 43 are disengaged, and the mounting ring plate 4 can be independently rotated by an angle, which is equal to the center included angle between two adjacent second bolt holes 41 in the circumferential direction, so as to realize rapid and accurate alignment. After assembly is completed, a function test can be carried out to verify whether the one-way transmission performance meets the requirements, and the test torque can be set to 1.2-1.5 times the rated torque.

[0062] The connection mode enables the reliable transmission of torque between the screw rod 3 and the mounting ring plate 4 and allows the relative rotation under certain conditions, solving the problem of the alignment of bolt holes during the mounting process. Through the cooperation of the interval tooth plate 32 and the tooth-shaped groove 43, the effective transmission of force is realized, and the convenience of use is ensured. The structure has high reliability and durability and can meet the use requirements of repeated disassembly and assembly.

[0063] In another technical solution, the cooperation of the interval tooth plate 32 and the tooth-shaped groove 43 allows the one-way rotation of the mounting ring plate 4 relative to the screw rod 3.

[0064] When the mounting ring plate 4 rotates in the first direction, the interval tooth plate 32 and the tooth-shaped groove 43 are engaged, driving the screw rod 3 to rotate synchronously.

[0065] When the mounting ring plate 4 rotates in the second direction opposite to the first direction, the interval tooth plate 32 and the tooth-shaped groove 43 are disengaged, and the mounting ring plate 4 can rotate independently. The rotation angle is consistent with the central angle between the two adjacent second bolt holes 41 in the circumferential direction, ensuring that the mounting ring plate 4 can be accurately positioned to the adjacent bolt hole position after rotating by a certain angle.

[0066] In the above technical solution, the interval tooth plate 32 can be made of 40Cr quenched and tempered steel, and the tooth shape is designed as an asymmetric trapezoid. The working face inclination angle can be set to 45 degrees to 60 degrees, and the non-working face inclination angle can be set to 80 degrees to 90 degrees. The tooth top width can be controlled within the range of 2 mm to 4 mm, and the tooth root fillet radius is not less than 0.5 mm. The tooth-shaped groove 43 can be processed by selecting 42CrMo material, and a gap of 0.1 mm to 0.3 mm is reserved at the groove bottom to avoid interference when engaged. The tooth surface hardness can be controlled within the range of HRC35 to HRC45, and the surface roughness Ra value is not greater than 3.2 μm.

[0067] When the mounting ring plate 4 rotates in the first direction, the working face of the interval tooth plate 32 is in full contact with the corresponding face of the tooth-shaped groove 43, and the contact area is not less than 70% of the tooth side area. At this time, the engagement angle is less than the friction angle, generating a self-locking effect, and the rated torque that can be transmitted can be set within the range of 500 N·m to 2000 N·m. When the mounting ring plate 4 rotates in the second direction, the non-working face of the interval tooth plate 32 forms a gap of 0.5 mm to 1.5 mm with the tooth-shaped groove 43, allowing the mounting ring plate 4 to rotate freely within a limited angle. The rotation resistance torque is not greater than 5 N·m, ensuring the convenience of operation.

[0068] The structure needs to be tested after assembly, and a torque wrench is used to apply a rotating torque during testing. First, rotate slowly in the first direction, and record the angle at which the torque is transmitted. This value should not exceed 3 degrees. Then rotate in the second direction and measure the resistance torque when idling. Finally, perform a durability test, which should not show significant wear on the tooth surface after 1000 repeated operations, and the one-way transmission function should remain normal. During testing, a dial gauge can be used to measure axial displacement to ensure that the axial displacement under torque does not exceed 0.1 mm.

[0069] This one-way rotation mechanism separates the screw 3 tightening and bolt hole alignment functions during installation through precise tooth design and gap control. In the first direction, it provides reliable torque transmission capability to ensure sufficient pre-tightening force; in the second direction, it allows easy adjustment of the installation angle within a limited angle range, simplifying the alignment operation. The mechanism has high reliability and service life, can withstand repeated operations without failure, and maintains good operation feel.

[0070] In another technical solution, the tooth pitch of the spacer tooth plate 32 is coordinated with the hole pitch of the first bolt hole 11 and the second bolt hole 41.

[0071] In the above technical solution, the tooth pitch can be designed as an integer multiple of the hole pitch, and the specific ratio can be selected as 1:1, 1:2, or 1:3 according to actual needs. When the ratio of 1:1 is selected, the tooth pitch is equal to the hole pitch, which can be typically set in the range of 20-40 mm. When the ratio of 1:2 is selected, the tooth pitch is half of the hole pitch, which can be controlled in the range of 10-20 mm. The tooth pitch tolerance can be controlled within ±0.05 mm, and the hole pitch tolerance can be controlled within ±0.1 mm. This ratio ensures that the relative displacement between the second bolt hole 41 on the mounting ring plate 4 and the first bolt hole 11 on the steel pipe end plate 1 is exactly an integer multiple of the hole pitch for each tooth pitch. t The coordination between the tooth pitch P h and the hole pitch P h satisfies the following formula: P t = N × P (where N is a positive integer, such as 1, 2, 3, …).

[0072] During manufacturing, tooth pitch machining can be completed using a numerical control milling machine, using a hard alloy end mill with a diameter of 8-12 mm, and the spindle speed can be set in the range of 800-1200 rpm, and the feed speed can be controlled in the range of 100-200 mm / min. Hole pitch machining can be done using a numerical control drilling machine, using a drill bit that is 0.5-1 mm smaller than the hole diameter to pre-drill the hole, and then using a reamer to finish machining. After machining, a projector is used to measure the tooth pitch, and a three-coordinate measuring instrument is used to check the hole pitch to ensure that the dimensional accuracy meets the requirements.

[0073] During assembly verification, first rotate the mounting ring plate 4 by one pitch, and use a feeler gauge to check the centering of the bolt holes. The offset should not exceed 0.5 mm. Then perform a continuous rotation test, and record the cumulative error after rotating 10 pitches. This value should not exceed 2 mm. Finally, perform a function test by rotating the mounting ring plate 4 at the rated torque, and verify that each tooth position can achieve accurate alignment of the bolt holes. During the test, use a torque wrench to measure the rotation resistance, ensuring that the operating torque does not exceed 15 N·m.

[0074] This coordinated design of pitch and hole distance ensures the accuracy of bolt hole alignment during installation, eliminating the need for repeated adjustments. Through precise size control, a mechanical positioning function is achieved, making the installation process faster and more accurate. This design improves installation efficiency, reduces manual adjustment time, and reduces uncertainty during installation. This coordination ensures the repeatability of node assembly, which is beneficial to improving engineering quality and construction efficiency.

[0075] In another technical solution, the plurality of spaced teeth plates 32 are all trapezoidal tooth structures, and the tooth top angle is 60-90°.

[0076] In the above technical solution, the structural parameters of the trapezoidal tooth include the tooth top angle, tooth height, and pitch, etc. The tooth top angle can be set to specific angles such as 60°, 75°, or 90°, with a tolerance control within ±1°. The tooth height can be designed to be 3-6 mm, and the tooth root fillet radius is not less than 0.5 mm. The tooth surface inclination angle can be set to 10-15° to ensure good meshing performance. The pitch can be set to 15-30 mm according to actual needs, maintaining a coordinated relationship with the bolt hole distance. The tooth top width can be controlled within 2-4 mm, and the tooth root width is increased accordingly to improve the carrying capacity. The tooth angle α satisfies α=arctan(μ)+θ (where μ is the friction coefficient and θ is the safety margin angle); the value of the tooth top angle α of the trapezoidal tooth is based on the calculation formula of the self-locking condition in mechanical principles. Among them, μ is the friction coefficient between the tooth surfaces, and θ is the safety angle added to ensure reliable meshing. This formula proves that the tooth angle is selected through strict mechanical calculation, which can not only ensure effective meshing and force transmission (self-locking) during forward rotation, but also smoothly disengage during reverse rotation. This has risen from "empirical design" to "theoretical calculation design", significantly enhancing the creativity.

[0077] The spacer tooth plate 32 can be made of 40Cr or 42CrMo alloy structural steel, and is quenched and tempered to have a hardness of HRC 35 to HRC 45. The tooth surface can be subjected to high-frequency quenching treatment, and the hardened layer depth is controlled to be between 0.8 mm and 1.2 mm. When processing, a numerical control milling machine is used, a hard alloy end mill with a diameter of 6 mm to 10 mm is used, the spindle speed can be set to be in a range of 1000 rpm to 1500 rpm, and the feed speed is controlled to be between 80 mm / min and 150 mm / min. After processing, the tooth surface roughness Ra value is not greater than 1.6 μm, and the tooth profile error is not more than 0.05 mm.

[0078] Performance verification includes tooth profile detection, strength test and durability test. The gear measuring instrument is used to detect the tooth profile parameters, to ensure that the addendum angle and the pitch are in line with the requirements. When performing static strength test, the torque is gradually increased to 1.5 times of the rated value, and no visible cracks should appear at the tooth root. The durability test needs to be repeated for more than 10000 times of meshing and disengaging operation, and the tooth surface wear is not more than 0.1 mm. During the test, the tooth surface contact condition also needs to be checked, and the contact area is required to be not less than 70% of the tooth surface, and the contact area is uniformly distributed.

[0079] The trapezoidal tooth structure ensures sufficient strength while providing good meshing performance. The addendum angle range of 60° to 90° ensures that the tooth root has sufficient strength and the tooth side has a suitable guide angle. The trapezoidal tooth shape is beneficial to force transmission and reduces stress concentration. The structure design enables the spacer tooth plate 32 to withstand a large working torque while maintaining long-term reliability. Reasonable tooth profile parameters also facilitate processing and quality control, and are beneficial to ensure product consistency.

[0080] Although the embodiments of the present application have been disclosed as above, they are not limited to the application listed in the specification and the embodiments, and can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A bolted and anchored flange connection node, characterized in that, The steel pipe end plate, sleeve, screw rod and mounting ring plate are included. One side of the steel pipe end plate is coaxially welded with the steel pipe to be spliced, the steel pipe end plate is a ring plate structure, the inner diameter of which matches the outer diameter of the sleeve, the sleeve is coaxially penetrated from the other side of the steel pipe end plate and fixedly connected therewith, the steel pipe end plate is provided with a plurality of first bolt holes in the circumferential direction, and the inner side wall of the sleeve is provided with internal threads. The mounting ring plate is provided with a mounting ring plate center hole along the axis, the inner diameter of which matches the outer diameter of the screw rod, the screw rod is coaxially penetrated through the mounting ring plate and fixedly connected therewith, the outer side wall of the screw rod is provided with external threads matched with the internal threads for screwing, and the mounting ring plate is provided with a plurality of second bolt holes in the circumferential direction. The two ends of the screw rod are coaxially screwed into the sleeves of the two symmetrical steel pipe end plates, and the first bolt holes on the two steel pipe end plates and the second bolt holes on the mounting ring plate are correspondingly communicated, high-strength bolts are penetrated into the correspondingly communicated first bolt holes and second bolt holes to realize connection and fastening. The outer side wall of the screw rod is uniformly provided with a plurality of interval tooth plates in the circumferential direction, the length of the interval tooth plates in the axial direction of the screw rod matches the thickness of the mounting ring plate, the interval tooth plates are not arranged along the axial length of the screw rod, the mounting ring plate center hole is provided with tooth-shaped grooves matched with the plurality of interval tooth plates in the circumferential direction, and the screw rod and the mounting ring plate are fixedly connected into an integrated body through the matched interval tooth plates and tooth-shaped grooves. The cooperation of the interval tooth plates and the tooth-shaped grooves allows the mounting ring plate to rotate in one direction relative to the screw rod. When the mounting ring plate rotates in a first direction, the interval tooth plates engage with the tooth-shaped grooves to drive the screw rod to rotate synchronously. When the mounting ring plate rotates in a second direction opposite to the first direction, the interval tooth plates disengage from the tooth-shaped grooves, and the mounting ring plate can rotate independently, and the rotation angle of the mounting ring plate matches the central included angle between two adjacent second bolt holes in the circumferential direction.

2. The bolted anchor flange joint node of claim 1, wherein, A plurality of rib plates are vertically welded in the circumferential direction between the end of the steel pipe end plate and the outer side wall of the steel pipe to be spliced.

3. The bolted anchor flange joint node of claim 1, wherein, The steel pipe to be spliced, the steel pipe end plate and the sleeve are fixedly connected into an integrated body by welding.

4. The bolted anchor flange joint node of claim 1, wherein, The screw rod and the mounting ring plate are fixedly connected into an integrated body by welding.

5. The bolted anchor flange joint node of claim 1, wherein, The pitch of the interval tooth plates matches the pitch of the first bolt holes and the second bolt holes.

6. The bolted anchor flange joint node of claim 5, wherein, The plurality of interval tooth plates are trapezoidal tooth structures, and the tooth top angle is 60-90°.

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