Steel bar mechanical connecting device for steel bar modular construction and construction method

Abstract

The invention discloses a reinforcing steel bar mechanical connecting device for reinforcing steel bar modular construction and a construction method, and belongs to the technical field of constructional engineering. The device realizes reinforced fixation of a steel bar connecting section through a semi-ring type locking mechanism, and mainly comprises a mechanical connecting sleeve, a semi-ring wire holding screw buckle and the semi-ring type locking mechanism. Wherein the annular locking mechanism formed by splicing the first semi-ring type locking mechanism and the second semi-ring type locking mechanism is spliced and fixed through circumferential rotation, and the two semi-ring holding wire screw buckles are tightly pressed on the periphery of the steel bar threading section. In this way, it is guaranteed that the thread compensation section is fully meshed with the reinforcing steel bar, and the slippage risk of a traditional elastic lock catch is eliminated through mechanical locking. According to the scheme, the technical limitation of a plane locking mode is broken through, the overall stability and vibration resistance of the connection joint are remarkably improved while the modular construction convenience is maintained, and the industrial pain points of stress concentration and insufficient eccentric load resistance of the threaded exposed section are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and particularly to a mechanical connection device and construction method for modular construction of steel bars. Background Art

[0002] Under the background of the rapid development of building industrialization and modular construction technology, the reliability and construction convenience of mechanical connection of steel bars have become the key technical bottlenecks restricting the development of prefabricated structures. Although the traditional threaded sleeve connection method can achieve the axial butt joint of steel bars, in the modular construction scenario, due to the non-rotatable characteristic of prefabricated steel bars, it is often necessary to machine an ultra-long threaded section at the end of the steel bar to compensate for construction errors, resulting in a significant reduction in the effective cross-section of the connection part and forming a weak structural link.

[0003] At present, although there have been technical solutions in the industry that use a split compensation structure to wrap the exposed threaded section, there are generally defects such as a single constraint dimension of the locking mechanism and insufficient anti-dynamic load performance. Especially when the steel bar is subjected to eccentric load or long-term vibration, the traditional locking components are prone to stress relaxation, resulting in misalignment and slip between the screw threads, which not only weakens the meshing effect of the compensation threads, but may also cause progressive structural failure. In addition, the installation accuracy and operability of existing devices in complex environments are also difficult to meet the requirements of high-efficiency assembly at the construction site. These problems have become important obstacles restricting the popularization of steel bar modular construction technology to high-intensity seismic areas and special working condition scenarios. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a mechanical connection device and construction method for modular construction of steel bars.

[0005] In a first aspect, the present invention provides a mechanical connection device for modular construction of steel bars, including a mechanical connection sleeve, a first semi-encircling wire screw thread, a second semi-encircling wire screw thread, and a semi-ring locking mechanism; The mechanical connection sleeve is provided with a first internal thread, which forms a threaded fit with the threaded sections of the first steel bar and the second steel bar; The first semi-encircling wire screw thread and the second semi-encircling wire screw thread are combined to form a complete circular structure, and its inner wall is provided with compensation threads that cooperate with the threaded section of the steel bar; The semi-ring locking mechanism includes a first semi-ring locking mechanism and a second semi-ring locking mechanism, and the first semi-ring locking mechanism and the second semi-ring locking mechanism are rotationally combined and fixed on the outer periphery of the first semi-encircling wire screw thread and the second semi-encircling wire screw thread.

[0006] Optionally, the first semi-ring locking mechanism includes a first mechanism main body, a first sleeve ring, and a first buckle, and the first sleeve ring is sleeved on the outer periphery of the first mechanism main body and is limited to twist in the groove by the first buckle; The second semi-ring type locking mechanism includes a second mechanism main body, a second collar and a second buckle. The second collar is sleeved on the outer periphery of the second mechanism main body and is limited to twist in the groove by the second buckle.

[0007] Optionally, a first friction surface is provided on the outer periphery of the first collar; The second collar is provided with a second friction surface.

[0008] Optionally, a first half tenon and a second half tenon are provided on the inner periphery of the first collar, and opposite first mortises are provided on the outer periphery of the first mechanism main body; The second collar is provided with opposite third half tenons and fourth half tenons, and opposite second mortises are provided on the outer periphery of the second mechanism main body; The first half tenon and the third half tenon are combined to form a complete tenon that cooperates with the first mortise, and the second half tenon and the fourth half tenon are combined to form a complete tenon that cooperates with the second mortise.

[0009] Optionally, positioning grooves for restricting the first semi-ring type locking mechanism and the second semi-ring type locking mechanism are provided on the outer peripheries of the first semi-ring wire screw and the second semi-ring wire screw.

[0010] Optionally, opposite fifth tenons and sixth tenons are provided on the surface of the positioning groove; Third mortises and fourth mortises that cooperate with the fifth tenon and the sixth tenon are respectively provided on the inner peripheries of the first semi-ring type locking mechanism and the second semi-ring type locking mechanism.

[0011] Optionally, a circumferential reinforcing rib is provided on the outer periphery of the semi-ring type locking mechanism, and the cross section of the circumferential reinforcing rib is in a T-shaped structure.

[0012] Optionally, the first internal thread includes a first thread section and a second thread section, and the first thread section and the second thread section form a differential thread structure; A cavity is provided between the first thread section and the second thread section.

[0013] Optionally, positioning marking lines are provided on the surfaces of the first semi-ring wire screw and the second semi-ring wire screw.

[0014] In a second aspect, the present invention further provides a construction method for a steel bar mechanical connection device for modular construction of steel bars. The construction method is applied to the device according to any one of the first aspect, and the method includes: S1. Screw the mechanical connection sleeve onto the threaded section of the first steel bar; S2. Rotate and advance the mechanical connection sleeve along the direction of the second steel bar until the mechanical connection sleeve completely covers the threaded section of the second steel bar. S3. Splice the first semi-encircling thread screw and the second semi-encircling thread screw onto the threaded section of the first steel bar exposed outside to form a complete screw thread structure. S4. Rotate and fix the first semi-ring locking mechanism and the second semi-ring locking mechanism to form a complete semi-ring locking mechanism, which is sleeved and fixed on the outer periphery of the first semi-encircling thread screw and the second semi-encircling thread screw.

[0015] The present invention has the following technical effects: Through the synergistic effect of the split compensation structure and the dynamic locking system, the connection device achieves efficient and reliable modular assembly. When the semi-encircling thread screw is spliced, the inner wall compensation thread thereof forms complementary meshing with the original thread of the steel bar during the process of wrapping the threaded section of the steel bar. This dual-thread contact mechanism can adaptively adjust the gap generated due to construction deviation. The assembled circular structure forms a continuous stress conduction surface along the axis of the steel bar, converting the local stress concentration of the traditional exposed threaded section into circumferentially uniformly distributed contact stress, significantly improving the anti-bending performance of the connection node.

[0016] The rotation and splicing process of the first semi-ring locking mechanism and the second semi-ring locking mechanism generates a three-dimensional binding force field. When the collar surrounds the main body of the mechanism and rotates, the wedge-shaped contact of the tenon generates a self-reinforcing radial pressure, which acts uniformly on the outer surface of the thread-holding screw along the spiral trajectory. The continuous annular restraint ring formed after the locking mechanism is closed eliminates longitudinal slip through the geometric limit of the positioning groove axially, suppresses elliptical deformation through the equal-stiffness support of the reinforcing rib radially, and maintains the torque transmission stability through the synergistic effect of the differential thread circumferentially. This three-dimensional restraint system enables the connection node to maintain the dynamic balance of contact stress in a vibrating environment.

[0017] The snap limit design of the split collar and the main body of the mechanism ensures the controllability of the operation process while achieving rapid assembly. The fluorescence alignment feature of the positioning marking line greatly shortens the construction calibration time. Combined with the self-compensation characteristic of the differential thread structure, the overall assembly efficiency is greatly improved compared with the traditional process. The continuous circumferential layout of the T-shaped reinforcing ribs effectively improves the anti-torsion stiffness of the locking mechanism, and the optimized cross-section design significantly improves the stress distribution uniformity. The hardened mating surface of the tenon and mortise maintains dimensional stability during long-term service, ensuring the restraint reliability of the locking mechanism under extreme temperature conditions. Description of the Drawings

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic structural diagram of a steel bar mechanical connection device for modular steel bar construction provided by an embodiment of the present invention; Figure 2 Schematic structural diagram of a first semi-ring type locking mechanism provided by an embodiment of the present invention; Figure 3 Schematic structural diagram of a second semi-ring type locking mechanism provided by an embodiment of the present invention; Figure 4 Schematic structural diagram of the overall structure of a semi-ring type locking mechanism provided by an embodiment of the present invention; Figure 5 Schematic structural diagram of an internal thread provided by an embodiment of the present invention.

[0020] Reference numerals 1. Mechanical connection sleeve; 2. First semi-ring wire thread; 3. Second semi-ring wire thread; 4. Semi-ring type locking mechanism; 11. First internal thread; 01. First steel bar; 02. Second steel bar; 10. Threaded section of steel bar; 41. First semi-ring type locking mechanism; 42. Second semi-ring type locking mechanism; 411. First mechanism main body; 412. First sleeve ring; 413. First buckle; 421. Second mechanism main body; 422. Second sleeve ring; 423. Second buckle; 414. First friction surface; 424. Second friction surface; 415. First semi-convex tenon; 416. Second semi-convex tenon; 417. First concave tenon; 11a. First thread section; 11b. Second thread section; 425. Third semi-convex tenon; 426. Fourth semi-convex tenon; 427. Second concave tenon. Detailed embodiments

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0022] Figure 1Schematic structural diagram of a steel bar mechanical connection device for modular construction of the present invention embodiment, including a mechanical connection sleeve 1, a first semi-circular wrapping wire screw thread 2, a second semi-circular wrapping wire screw thread 3, and a semi-circular locking mechanism 4; The mechanical connection sleeve 1 is provided with a first internal thread 11, which forms a threaded fit with the threaded sections 10 of the first steel bar 01 and the second steel bar 02; The first semi-circular wrapping wire screw thread 2 and the second semi-circular wrapping wire screw thread 3 are combined to form a complete circular structure, and its inner wall is provided with a compensation thread that cooperates with the threaded section 10 of the steel bar; The semi-circular locking mechanism 4 includes a first semi-circular locking mechanism 41 and a second semi-circular locking mechanism 42. The first semi-circular locking mechanism 41 and the second semi-circular locking mechanism 42 are fixedly arranged on the outer periphery of the first semi-circular wrapping wire screw thread 2 and the second semi-circular wrapping wire screw thread 3 based on rotational combination.

[0023] The mechanical connection sleeve 1 can be integrally forged from high-strength alloy steel. A continuous spiral first internal thread 11 is machined on its inner surface, which meshes with the threaded section 10 of the steel bar. Chamfer guiding structures can be arranged at the openings at both ends of the mechanical connection sleeve 1 to facilitate quickly aligning with the steel bar axis for screwing-in operation during construction.

[0024] The first semi-circular wrapping wire screw thread 2 and the second semi-circular wrapping wire screw thread 3 are separately cast. The inner wall of the complete circular structure formed after their combination is distributed with compensation threads. The pitch of this compensation thread is the same as the original thread of the threaded section 10 of the steel bar, and it forms supplementary meshing with the exposed threaded section 10 of the steel bar after the wrapping wire screw thread is closed. The outer circumferential surface of the combined wrapping wire screw thread maintains a complete cylindrical shape, providing a uniform constraint surface for the subsequent installation of the semi-circular locking mechanism 4.

[0025] The semi-circular locking mechanism 4 is composed of a combination of the first semi-circular locking mechanism 41 and the second semi-circular locking mechanism 42. The arc-shaped inner surface of the first semi-circular locking mechanism 41 maintains a clearance fit with the outer circumferential surface of the wrapping wire screw thread.

[0026] During the installation process, the operator first screws the mechanical connection sleeve 1 onto the threaded section 10 of the first steel bar 01 to complete preliminary fixation through threaded meshing. Subsequently, the mechanical connection sleeve 1 is rotated in the reverse direction and sleeved onto the second steel bar 02, and the two steel bar end faces are pushed into close contact by the threaded force transmission. When the mechanical connection sleeve 1 completely covers the threaded sections 10 of the two steel bars, the split first semi-circular wrapping wire screw thread 2 and the second semi-circular wrapping wire screw thread 3 are buckled onto the exposed threaded section 10 of the steel bar. At this time, the compensation thread and the original thread of the steel bar form double meshing, effectively filling the gap caused by construction errors. Finally, the first semi-circular locking mechanism 41 and the first semi-circular locking mechanism 42 are respectively sleeved on the periphery of the wrapping wire screw thread, and the semi-circular locking mechanism 4 is gradually tightened through a circumferential rotation action, generating a continuously increasing radial constraint force.

[0027] The semi - ring locking mechanism 4 forms a continuous closed ring body through rotational fitting, applying uniform circumferential pressure to the wire - holding screw thread in three - dimensional space. During the rotation process, a progressive frictional contact is generated between the inner surface of the semi - ring locking mechanism 4 and the outer surface of the wire - holding screw thread, forcing the split wire - holding screw thread to continuously press towards the axis direction of the steel bar. This dynamic locking method not only eliminates the local stress concentration phenomenon existing in traditional planar locking, but also effectively inhibits the axial slip tendency of the screw thread through three - dimensional constraints. When the semi - ring locking mechanism 4 rotates to a predetermined angle, its end is clamped and locked, forming an irreversible mechanical locking state.

[0028] During the use of the device, the mechanical connection sleeve 1 realizes the stable transmission of the axial force of the steel bar through standard threads, and the threaded section of the exposed wire - holding screw thread forms a protective wrapping. The radial pressure generated by the semi - ring locking mechanism 4 keeps the compensating thread and the original thread of the steel bar in close meshing all the time. Even when bearing eccentric loads or vibration shocks, there will be no phenomenon of enlarged thread clearance. The three - dimensional constraint system effectively disperses the stress distribution and significantly improves the anti - fatigue performance of the connection node. While maintaining the convenience of modular construction, the whole device ensures that the connection end of the steel bar forms a rigid whole, fundamentally eliminating the progressive failure risk existing in traditional elastic locking.

[0029] Figure 2 It is a schematic structural diagram of a first semi - ring locking mechanism provided by an embodiment of the present invention. Figure 3 It is a schematic structural diagram of a second semi - ring locking mechanism provided by an embodiment of the present invention. Figure 4 It is a schematic overall structural diagram of a semi - ring locking mechanism provided by an embodiment of the present invention. In some embodiments, the first semi - ring locking mechanism 41 includes a first mechanism main body 411, a first collar 412, and a first buckle 413. The first collar 412 is sleeved on the outer periphery of the first mechanism main body 411 and is limited to twist in the groove by the first buckle 413. The second semi - ring locking mechanism 42 includes a second mechanism main body 421, a second collar 422, and a second buckle 423. The second collar 422 is sleeved on the outer periphery of the second mechanism main body 421 and is limited to twist in the groove by the second buckle 423.

[0030] The first semi - ring locking mechanism 41 and the second semi - ring locking mechanism 42 are designed in a mirror - symmetry or central - symmetry as a whole. The first mechanism main body 411 and the second mechanism main body 421 form a constraining effect on the wire - holding screw thread. The first collar 412 and the second collar 422 are used to fix and tighten the first mechanism main body 411 and the second mechanism main body 421, so that the first mechanism main body 411 and the second mechanism main body 421 form a radial binding force on the wire - holding screw thread. The first buckle 413 and the second buckle 423 are used to restrain the first collar 412 and the second collar 422 to prevent the collars from falling off.

[0031] During the installation process, the operator pushes the collar into the guide groove in the buckle along the outer periphery of the mechanism body. At this time, the collar still retains the circumferential rotational freedom, and a torque can be applied by a special tool to rotate it around the axis of the main body. It should be noted that most of the structures in the embodiments of the present application are symmetrical designs, such as the first mechanism body 411 and the second mechanism body 421. Therefore, during the description process, a certain structure may be described in the form of abbreviations. For example, the mechanism body generally represents the first mechanism body 411 and the second mechanism body 421. Similarly, the collar can represent the first collar 412 and the second collar 422. If a certain structure needs to be specially described separately, it will be clearly pointed out. For example, when the structure of the first mechanism body 411 needs to be described, it will be clearly stated that this is the first mechanism body 411.

[0032] During the locking operation, the operator uses a wrench tool to clamp the outer circumference of the collar and apply a rotational torque in the same direction. The collar produces a circumferential displacement relative to the main body of the mechanism in the guide groove. As the rotation angle increases, the inner wall of the collar and the outer surface of the main body of the mechanism are squeezed, forcing the two semi-ring locking mechanisms 41 and 42 to shrink toward the center of the threaded screw. When rotated into place, the collar and the main body of the mechanism form a mechanical interlock, and the radial pressure reaches the design threshold, such as Figure 4 shown.

[0033] The structure generates a continuously increasing radial locking force through the relative rotation of the collar and the main body of the mechanism, and the buckle provides radial limitation. The main body of the mechanism with an I-shaped cross-section maintains structural stability when subjected to radial pressure, avoiding plastic deformation during the locking process. The symmetrically distributed buckle design enables the two semi-ring locking mechanisms 4 to form a balanced force system after assembly, effectively preventing locking failure caused by unilateral stress concentration. The entire semi-ring locking mechanism 4 forms a self-balancing constraint system after assembly, which can maintain a stable radial compression state even if it is subjected to alternating loads for a long time.

[0034] In some embodiments, a first friction surface 414 is disposed on the outer periphery of the first collar 412; The second ring 422 is provided with a second friction surface 424 .

[0035] The first friction surface 414 and the second friction surface 424 are provided to provide sufficient friction force for the special wrench, so that the semi-ring locking mechanism 4 can be tightened by the wrench during the installation process.

[0036] When installing the semi-ring locking mechanism 4, the operator uses a special wrench tool to engage between the anti-slip grooves of the first friction surface 414 and the second friction surface 424. During the application of the rotational torque, the raised structures on the inner wall of the wrench form multiple-point engagement with the grooves on the friction surface to ensure effective torque transmission. When the collar rotates, the contact area between the friction surface and the wrench undergoes local elastic deformation, increasing the contact area while reducing the surface pressure. After locking is completed, the radial grooves on the first friction surface 414 and the second friction surface 424 form a self-locking angle to resist the reverse rotation tendency caused by external vibration.

[0037] In some embodiments, the inner circumference of the first collar 412 is provided with opposite first half-tenons 415 and second half-tenons 416, and the outer circumference of the first mechanism body 411 is provided with opposite first mortises 417; The second collar 422 is provided with opposite third half-tenons 425 and fourth half-tenons 426, and the outer circumference of the second mechanism body 421 is provided with opposite second mortises 427; The first half-tenon 415 and the third half-tenon 425 are joined together to form a complete tenon that mates with the first mortise 417, and the second half-tenon 416 and the fourth half-tenon 426 are joined together to form a complete tenon that mates with the second mortise 427.

[0038] The first half-tenons 415 and the second half-tenons 416 are circumferentially equidistributed along the inner circumference of the first collar 412, and the two are symmetrically arranged at 180°. The first half-tenon 415 can be designed with a trapezoidal cross-section, and the top width is slightly smaller than the root to form a self-locking inclined plane. The second half-tenon 416 has the same structural parameters as the former, and respectively corresponds to the first mortise 417 on the outer circumference of the first mechanism body 411 during installation. The third half-tenons 425 and the fourth half-tenons 426 provided on the inner circumference of the second collar 422 form a complementary structure with the second mortises 427 of the second mechanism body 421. When the two semi-ring locking mechanisms 4 are joined together, the first half-tenon 415 and the third half-tenon 425 are combined to form a complete trapezoidal tenon, and the second half-tenon 416 and the fourth half-tenon 426 form another set of complete tenons.

[0039] During the rotation of the first collar 412 and the second collar 422, the half-tenons slide along the outer surfaces of the mechanism bodies 411 and 421. When rotated to a specific angle, the complete tenons form geometric interference with the first mortise 417 and the second mortise 427, forcing the collar to produce a radial displacement. When the inclined plane of the trapezoidal cross-section tenon contacts the inner wall of the mortise, a wedging effect is generated, converting the rotational motion into a radial restraining force. The guiding chamfer provided at the top of the tenon helps the collar to automatically slide into the positioning point of the mortise at the end of rotation, and at this time, the mechanism body and the collar form a mechanical interlock.

[0040] The circumferential positioning of the collar is achieved through the precise fit of tenons and mortises. The trapezoidal cross-section design ensures that there is no backlash due to vibration after locking. The symmetrically distributed tenon groups form a double-locking mechanism after fitting, eliminating the risk of single-point failure.

[0041] In some embodiments, positioning grooves for restricting the first semi-ring locking mechanism 41 and the second semi-ring locking mechanism 42 are provided on the outer peripheries of the first semi-circular wrapped wire screw 2 and the second semi-circular wrapped wire screw 3.

[0042] Circular positioning grooves are machined on the outer peripheral surfaces of the first semi-circular wrapped wire screw 2 and the second semi-circular wrapped wire screw 3. The groove is arranged axially in the middle, and the depth is slightly greater than the installation thickness of the semi-ring locking mechanism 4. The two side walls of the groove adopt a bevel transition design, and a guiding fillet is provided at the entrance to facilitate the sliding of the semi-ring locking mechanism 4. The bottom surface of the groove is precisely ground to form a smooth reference surface, which forms a surface contact constraint with the inner surface of the semi-ring locking mechanism 4.

[0043] During the installation process, the operator aligns the arc-shaped inner edges of the first semi-ring locking mechanism 41 and the second semi-ring locking mechanism 42 with the positioning groove and then pushes them in. The axial limiting function of the positioning groove prevents the semi-ring locking mechanism 4 from moving axially along the axis of the steel bar, and the two side beveled groove walls exert a radial guiding effect on the mechanism. When the semi-ring locking mechanism 4 is completely embedded in the positioning groove, its inner surface forms a tight fit with the reference surface at the bottom of the groove, eliminating the assembly gap.

[0044] The circular structure of the positioning groove provides a circumferential constraint reference for the semi-ring locking mechanism 4, and the bevel transition design generates a progressive pressing force when the semi-ring locking mechanism 4 rotates. The smooth surface at the bottom of the groove reduces the frictional resistance, ensuring the smooth movement of the semi-ring locking mechanism 4 during rotation. This positioning structure achieves the precise alignment of the semi-ring locking mechanism 4 through geometric constraints, avoiding the common axial misalignment problems in traditional construction, and at the same time establishing a stable mechanical transmission path for the subsequent rotation locking operation.

[0045] In some embodiments, opposite fifth tenons and sixth tenons are provided on the surface of the positioning groove; Third mortises and fourth mortises that cooperate with the fifth tenon and the sixth tenon are respectively provided on the inner circumferences of the first semi-ring locking mechanism 41 and the second semi-ring locking mechanism 42.

[0046] The fifth tenon and the sixth tenon are machined on the bottom surface of the positioning groove. The two are circumferentially spaced apart and have a trapezoidal cross-section structure. The inclined surface of the fifth tenon forms a complementary angle with the third mortise on the inner circumference of the first semi-ring locking mechanism 41, and the inclined surface of the sixth tenon maintains the same mating relationship with the fourth mortise. A guiding fillet is provided at the top of the tenon, and the bottom transition area is smoothly connected by an arc to avoid stress concentration. The depths of the third mortise and the fourth mortise are slightly greater than the height of the tenon, forming an assembly reserve space.

[0047] When the first semi - ring locking mechanism 41 and the second semi - ring locking mechanism 42 are latched into the positioning groove, the third mortise and the fourth mortise slide along the surfaces of the fifth tenon and the sixth tenon. During the rotation locking process, the side walls of the mortises come into contact and extrusion with the inclined surfaces of the tenons, forcing the semi - ring locking mechanism 4 to have a centripetal displacement. The self - locking angle of the trapezoidal cross - section of the tenon forms a mechanical limit after rotation in place, preventing the semi - ring locking mechanism 4 from rotating in the reverse direction. The wear - resistant coating provided on the inner wall of the mortise and the hardened treatment layer on the surface of the tenon form a low - friction pair, ensuring smooth rotation.

[0048] This mating structure realizes the dual functions of rotation locking and radial positioning through inclined surface contact. The geometric characteristics of the trapezoidal cross - section convert the rotational kinetic energy into a stable radial pressing force. The clearance fit between the tenon and the mortise allows for a small amount of elastic deformation, avoiding over - constraint while ensuring assembly accuracy. The symmetric layout of the double tenons enables the semi - ring locking mechanism 4 to obtain balanced binding forces at any circumferential angle, effectively eliminating the risk of eccentric load existing in traditional single - point positioning. The arc transition design at the bottom of the mortise disperses the contact stress and improves the structural durability under repeated disassembly and assembly conditions.

[0049] In some embodiments, a circumferential reinforcing rib is provided on the outer periphery of the semi - ring locking mechanism 4, and the cross - section of the circumferential reinforcing rib is in a T - shaped structure.

[0050] A circumferential reinforcing rib is integrally formed on the outer periphery of the semi - ring locking mechanism 4, and extends continuously along the circumference of the semi - ring locking mechanism 4 to form a closed annular structure. The T - shaped cross - section of the circumferential reinforcing rib is composed of a vertical web and a horizontal flange. The root of the web is smoothly transitionally connected to the outer surface of the semi - ring locking mechanism 4, and the end of the flange extends outward to form a reinforcing edge.

[0051] The unique geometric characteristics of the T - shaped cross - section enable the circumferential reinforcing rib to have both bending resistance and torsional resistance. When the semi - ring locking mechanism 4 bears an eccentric load, the reinforcing rib balances the stress differences in different directions through the cross - section deformation coordination mechanism. The continuous closed annular layout eliminates the stress mutation points existing in traditional discontinuous reinforcing ribs, and the chamfer design at the edge of the flange further reduces the stress concentration coefficient. This structure significantly improves the shape - maintaining ability of the semi - ring locking mechanism 4 under complex working conditions, ensuring a stable radial binding force during long - term service.

[0052] Figure 5 This is a schematic diagram of an internal thread structure provided by an embodiment of the present invention. In some embodiments, the first internal thread 11 includes a first thread section 11a and a second thread section 11b, and the first thread section 11a and the second thread section 11b form a differential thread structure; A cavity is provided between the first thread section 11a and the second thread section 11b.

[0053] The first internal thread 11 on the inner wall of the mechanical connection sleeve 1 is a differential thread structure composed of a first thread segment 11a and a second thread segment 11b, and the two thread segments are designed with a same-direction gradual pitch. The first thread segment 11a is close to the sleeve port area, and its thread tooth surface is polished and coated with a friction-reducing coating; the second thread segment 11b is located in the middle of the sleeve, and a micro oil storage pit is processed on the thread tooth top. An annular cavity is set in the intersection area of ​​the two thread segments, the bottom of the cavity is a streamlined curved surface, and a spiral oil guide groove is set on the side wall.

[0054] When the mechanical connection sleeve 1 is screwed into the steel bar threading section 10, the friction-reducing coating of the first threaded section 11a preferentially contacts the steel bar thread in the initial screwing stage, reducing the screwing resistance through the low friction coefficient. As the tightening depth increases, the oil storage pits of the second threaded section 11b continuously release the lubricating medium to form a uniform oil film between the thread pairs. The axial differential force generated by the differential thread structure automatically levels the end face of the steel bar, eliminating local contact friction caused by axis deviation. The oil guide groove arranged inside the cavity guides excess lubricant to the thread contact area, while collecting metal debris generated during the screwing process to prevent hard particles from increasing the friction coefficient.

[0055] In some embodiments, positioning marking lines are provided on the surfaces of the first half-hoop wire turnbuckle 2 and the second half-hoop wire turnbuckle 3.

[0056] The outer surfaces of the first semi-circular thread screw buckle 2 and the second semi-circular thread screw buckle 3 are printed with positioning marking lines along the axial direction, and the marking lines can be formed by spraying high-contrast wear-resistant paint. The marking line of the first semi-circular thread screw buckle 2 includes an axially extending arrow symbol and a radially distributed annular reference line, and the marking line of the second semi-circular thread screw buckle 3 is designed as a complementary arrow tail pattern and annular alignment line. During installation, the operator visually matches the geometric correspondence between the tip of the arrow symbol and the tail of the two semi-circular thread screw buckles, and ensures that the radial annular line forms a continuous closed loop. The surface of the marking line is covered with a transparent anti-oxidation coating, which can be excited by irradiation with a portable ultraviolet lamp in a weak light environment. In the process of splicing the semi-circular thread screw buckle, when the tip of the arrow completely overlaps with the edge of the tail and the radial loop is not misaligned, it indicates that the compensating thread and the steel bar threading segment 10 are precisely aligned. This design achieves fast and accurate assembly through visual guidance, eliminates the risk of angle deviation during the splicing of traditional screw buckles, and the dual verification mechanism of the axial arrow and the radial loop ensures complete alignment in three-dimensional space.

[0057] The embodiment of the present invention further provides a construction method of a steel bar mechanical connection device for steel bar modular construction, the construction method is applied to a device as in any one of the above device embodiments, the method comprising: S1, screwing the mechanical connection sleeve 1 into the steel bar threading section 10 of the first steel bar 01; S2. Rotate and advance the mechanical connection sleeve 1 along the direction of the second steel bar 02 until the mechanical connection sleeve 1 completely covers the threaded section 10 of the second steel bar 02. S3. Assemble the first half-ring wire screw thread 2 and the second half-ring wire screw thread 3 on the threaded section 10 of the first steel bar 01 exposed outside to form a complete screw thread structure. S4. Rotate and fix the first half-ring locking mechanism 41 and the second half-ring locking mechanism 42 to form a complete half-ring locking mechanism 4, which is sleeved and fixed on the outer periphery of the first half-ring wire screw thread 2 and the second half-ring wire screw thread 3.

[0058] During implementation, the operator first aligns the mechanical connection sleeve 1 with the threaded section 10 of the first steel bar 01 and screws it in clockwise until the end face of the mechanical connection sleeve is flush with the end of the steel bar. During the screwing process, the first internal thread 11 of the mechanical connection sleeve 1 forms continuous meshing with the threaded section 10 of the steel bar, and the axial tension generated ensures the initial assembly accuracy. Subsequently, insert the threaded section 10 of the second steel bar 02 into the other end of the mechanical connection sleeve 1, and rotate the sleeve counterclockwise to make it move towards the second steel bar. The thread transmission force pushes the end faces of the two steel bars into close contact. At this stage, the mechanical connection sleeve 1 completely covers the threaded sections of the two steel bars, forming a basic connection structure.

[0059] After installing the mechanical connection sleeve 1, take the first half-ring wire screw thread 2 and the second half-ring wire screw thread 3 and wrap them around the threaded section 10 of the first steel bar 01 exposed outside in a radially mated manner. During operation, visual alignment is carried out through the positioning marking lines on the outer surface of the wire screw thread to ensure that the compensation threads of the two half-ring wire screw threads completely coincide with the original threads of the steel bar. The assembled wire screw threads form a continuous cylinder to wrap the steel bar, and the inner wall threads thereof form complementary meshing with the threaded section 10 of the steel bar, eliminating the thread clearance.

[0060] Finally, snap the pre-installed first half-ring locking mechanism 41 and the second half-ring locking mechanism 42 circumferentially around the periphery of the wire screw thread. Use a special wrench tool to engage with the outer periphery of the first half-ring locking mechanism 41 and the second half-ring locking mechanism 42, and apply a clockwise rotation torque to drive the first sleeve ring 412 and the second sleeve ring 422 to rotate synchronously. During the rotation process, a progressive radial pressure is generated between the inner surface of the half-ring locking mechanism 4 and the outer surface of the wire screw thread, forcing the first half-ring wire screw thread 2 and the second half-ring wire screw thread 3 to contract towards the axis of the steel bar. When the first buckle 413 and the second buckle 423 make a positioning sound during rotation, the half-ring locking mechanism 4 forms a closed-loop rigid constraint, and the three-dimensional pressure field makes the compensation thread and the original thread reach a completely conjugate state.

[0061] This method realizes modular construction through step-by-step assembly. After the mechanical connection sleeve 1 completes the construction of the axial force transmission foundation, the first half-ring wrapping wire screw thread 2 and the second half-ring wrapping wire screw thread 3 achieve thread clearance compensation, and finally the half-ring type locking mechanism 4 forms an irreversible mechanical constraint. The multi-directional pressure generated during the rotation locking process effectively inhibits the loosening of the thread pair caused by vibration, and the synergistic effect of the differential thread structure and the compensation thread eliminates the stress concentration phenomenon in traditional connections. The entire construction process can be completed only with conventional wrench tools, and the standardization of the operation process significantly improves the assembly efficiency while ensuring that the connection node reaches the bearing performance equivalent to that of welding.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A steel bar mechanical connection device for steel bar modular construction, characterized in that: It comprises a mechanical connection sleeve (1), a first half-encircling thread screw buckle (2), a second half-encircling thread screw buckle (3) and a semi-ring type locking mechanism (4); The mechanical connection sleeve (1) is provided with a first internal thread (11) which forms a threaded fit with the steel bar threaded sections (10) of the first steel bar (01) and the second steel bar (02); The first half-hoop thread screw buckle (2) and the second half-hoop thread screw buckle (3) are assembled to form a full-circular structure, the inner wall of which is provided with a compensating thread that cooperates with the steel bar threading section (10); The semi-annular locking mechanism (4) comprises a first semi-annular locking mechanism (41) and a second semi-annular locking mechanism (42), wherein the first semi-annular locking mechanism (41) and the second semi-annular locking mechanism (42) are fixed to the outer periphery of the first semi-annular threaded buckle (2) and the second semi-annular threaded buckle (3) based on rotational splicing.

2. The device according to claim 1, characterized in that The first semi-ring type locking mechanism (41) comprises a first mechanism body (411), a first sleeve ring (412) and a first buckle (413); the first sleeve ring (412) is sleeved on the outer periphery of the first mechanism body (411) and is limited in position and twisted in the groove by the first buckle (413); The second semi-ring type locking mechanism (42) comprises a second mechanism body (421), a second sleeve ring (422) and a second buckle (423); the second sleeve ring (422) is sleeved on the outer circumference of the second mechanism body (421) and is limited in position and twisted in the groove by the second buckle (423).

3. The device according to claim 2, characterized in that A first friction surface (414) is provided on the outer periphery of the first sleeve ring (412); The second sleeve ring (422) is provided with a second friction surface (424).

4. The device according to claim 2, characterized in that The first sleeve ring (412) is provided with a first half tenon (415) and a second half tenon (416) opposite to each other on its inner periphery, and the first mechanism body (411) is provided with a first concave tenon (417) opposite to each other on its outer periphery; The second sleeve ring (422) is provided with a third half tenon (425) and a fourth half tenon (426) which are opposite to each other, and the outer periphery of the second mechanism body (421) is provided with a second opposite tenon (427); The first half tenon (415) and the third half tenon (425) are assembled to form a complete tenon that matches the first concave tenon (417), and the second half tenon (416) and the fourth half tenon (426) are assembled to form a complete tenon that matches the second concave tenon (427).

5. The device according to claim 1, characterized in that Positioning grooves for limiting the first semi-annular locking mechanism (41) and the second semi-annular locking mechanism (42) are provided on the outer periphery of the first semi-annular thread screw buckle (2) and the second semi-annular thread screw buckle (3).

6. The device according to claim 5, characterized in that The surface of the positioning groove is provided with a fifth tenon and a sixth tenon opposite to each other; The first semi-ring type locking mechanism (41) and the second semi-ring type locking mechanism (42) are respectively provided with a third concave tenon and a fourth concave tenon on their inner circumferences, which cooperate with the fifth convex tenon and the sixth convex tenon.

7. The device according to claim 1, characterized in that The semi-ring type locking mechanism (4) is provided with an annular reinforcement rib on its outer periphery, and the cross section of the annular reinforcement rib is a T-shaped structure.

8. The device according to claim 1, characterized in that The first internal thread (11) comprises a first thread segment (11a) and a second thread segment (11b), and the first thread segment (11a) and the second thread segment (11b) form a differential thread structure; The first thread segment (11a) and the second thread segment (11b) are provided with a cavity.

9. The device according to claim 1, characterized in that Positioning marking lines are provided on the surfaces of the first semi-circular thread screw buckle (2) and the second semi-circular thread screw buckle (3).

10. A construction method of a steel bar mechanical connection device for steel bar modular construction, characterized in that: The construction method is applied to the device according to any one of claims 1 to 9, and the method comprises: S1, screwing the mechanical connection sleeve (1) onto the steel bar threading section (10) of the first steel bar (01); S2, rotating the mechanical connection sleeve (1) forward along the direction of the second steel bar (02) until the mechanical connection sleeve (1) completely covers the steel bar threading section (10) of the second steel bar (02); S3, splicing the first half-hoop wire screw buckle (2) and the second half-hoop wire screw buckle (3) onto the steel bar threading section (10) exposed outside of the first steel bar (01) to form a complete screw buckle structure; S4, rotating and fixing the first semi-annular locking mechanism (41) and the second semi-annular locking mechanism (42) to form a complete semi-annular locking mechanism (4), which is sleeved and fixed on the outer circumference of the first semi-annular threaded buckle (2) and the second semi-annular threaded buckle (3).

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