A double-ended pre-tensioned connector and locking tool

Abstract

The application discloses a double-head pre-tightening connector and a locking tool, and relates to the technical field of fabricated buildings. The double-head pre-tightening connector is arranged between adjacent integrated modules or fabricated prefabricated components, and specifically comprises a female connector, a double-head connecting rod and a prefabricated component. The female connector is fixedly arranged in the prefabricated component and is fixedly connected with the reinforcing steel bars in the prefabricated component. The two ends of the double-head connecting rod are respectively threadedly connected with the female connectors in the adjacent prefabricated components, and can be locked with the female connectors and kept with a certain anti-loosening pre-tightening force under the driving of the locking tool. In use, only after the prefabricated components are connected and locked through the double-head pre-tightening connector, the inside of the connector is injected with condensation hardening material for sealing treatment, so that the corrosion and loosening of the threaded connection part are prevented, and the reliable connection and installation of the prefabricated components can be realized. The application has the advantages of simple operation steps, reliable connection and fixation and low implementation cost, and can significantly improve the industrialization degree of fabricated building construction.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building technology, specifically to a double-headed pre-tightening connector and a locking tool. Background Technology

[0002] In recent years, my country's urbanization level has continued to improve, and the industrialization process has steadily advanced. The domestic demand market has become the potential source of economic growth. For the construction industry, a variety of diversified market demands targeting the construction industry, such as modular construction and energy-saving housing, have emerged one after another. Against this background, prefabricated building systems, which have the characteristics of standardized design and production and energy-saving construction, have been widely developed.

[0003] Prefabricated construction refers to transferring a large amount of on-site construction work from traditional construction methods to factories. Components such as floor slabs, wall panels, stairs, and balconies can be prefabricated in factories and then transported to the site for assembly.

[0004] To ensure the structural strength and reliability of prefabricated buildings, a reliable method is needed to connect and fix prefabricated components. Utility model patent CN219690740U discloses a non-fixed-end mechanical connection device (hereinafter referred to as a mechanical joint), which includes a female connector and a male connector. The male connector includes a connecting rod with a connecting rod body. The connecting rod body engages with the female connector, which is fixedly installed in the prefabricated component, and locks when they move away from each other, providing connection tension during prefabricated component installation. This mechanical joint can adapt to the connection of large-sized prefabricated components in prefabricated buildings and greatly improves the industrialization level of on-site construction of prefabricated buildings.

[0005] However, in this type of mechanical joint, the connecting rod and the female connector fixed in the prefabricated component are in a one-way locking and checkpoint state. The locking engagement can only be achieved when the connecting rod and the female connector are far apart, providing connecting tension to the prefabricated component. The locking end has a potential for loosening in the direction where the connecting rod and the female connector are close together. If the locking end is not subjected to tension for a long time, the connection of the prefabricated component will be uncertain, raising doubts about the reliability of prefabricated buildings. Although the utility model patent with publication number CN219690740U also discloses an improved solution to increase the reliability of mechanical joint connections—that is, using a tension locking device to open the prefabricated component connected by the mechanical joint to provide pre-tightening force and achieve the effect of tension locking at the locking end of the mechanical joint—the installation and operation of the tension locking device is difficult due to the large weight and number of prefabricated components to be connected by the mechanical joint, which is not conducive to actual on-site construction operations. In addition, after prefabricated components are connected by such mechanical joints, gaps will inevitably be generated on the mounting surface. Multiple mechanical joints are often required to connect the same prefabricated component on the same mounting surface. Since the mechanical gaps generated by each mechanical joint cannot be controlled, the stress on each mechanical joint will be different, which will affect the tensile strength of the overall structure. Summary of the Invention

[0006] In summary, in view of the shortcomings of the prior art, the purpose of this invention is to provide a double-headed pre-tightening connector that provides connection pre-tightening force in a more convenient way to avoid the risk of connection loosening, and to controllably adjust the mechanical gap between prefabricated components to achieve seamless connection of prefabricated components.

[0007] In addition, the present invention also provides a special locking tool that makes it easier to lock the device during the bidirectional tightening operation of the double-headed pre-tightening connector.

[0008] The first objective of this invention is achieved through the following approach: A double-ended pre-tightening connector includes a female connector, a double-ended connecting rod, and a prefabricated component. The female connector is fixedly disposed within the prefabricated component. The double-ended connecting rod has oppositely oriented external threads at both ends and a rotating portion in its middle. Both ends of the double-ended connecting rod are connected to female connectors. The double-ended connecting rod can rotate when the rotating portion is subjected to rotational force, screwing into the female connector to generate an axial tension force, driving the female connectors at both ends to move towards the rotating portion, thereby causing the prefabricated components at both ends to fit together without gaps and lock and fix under the action of the axial tension force. The female connector includes a female housing, a threaded locking element, and a retaining structure. The female housing is fixedly disposed within the prefabricated component, with one end having a cavity for accommodating the double-ended connecting rod. The threaded locking element is detachably disposed within the cavity of the female housing, and the threaded locking element has an internal thread that connects to the end of the double-ended connecting rod. The connection is made with external threads; the cavity outlet of the female connector shell contracts inward to form a baffle structure; the threaded locking element includes a locking nut, the outer peripheral wall of which has a regular surface, which can be engaged with the inner cavity wall of the female connector shell, slide up and down along the axial direction, and cannot rotate around the central axis; the end of the locking nut has a horizontal nut plane, and the baffle structure has a horizontal abutment surface; the inner cavity of the female connector shell expands outward at the abutment point between the locking nut and the baffle structure, and the inner circle of the expanded part encloses the outer edge contour of the locking nut. As the engagement length of the external threads of the locking nut and the end of the double-ended connecting rod continuously increases, it gradually moves towards the rotating part. When it is translated to the expanded part of the female connector shell, the outer edge of the locking nut separates from the inner cavity wall of the female connector shell, and can rotate freely around the central axis in the expanded part of the female connector shell.

[0009] As a further improvement of the present invention, a locking tool is also included, which can extend into the prefabricated component to provide rotational driving force for the rotating part of the double-ended connecting rod. When the locking tool drives the double-ended connecting rod to continuously screw into the threaded locking member, it can drive the threaded locking member to move closer to the rotating part and abut against the stop structure, generating an axial tension force on the female connector shell, thereby driving the locking and fixing of the prefabricated components at both ends.

[0010] As a further improvement of the present invention, it also includes an elastic element, which is provided in the cavity of the female connector at least one end. One end of the elastic element abuts against the bottom wall of the inner cavity of the female connector, and the other end abuts against the threaded locking element. Under the elastic force of the elastic element, the threaded locking element tends to move toward the rotating part.

[0011] As a further improvement of the present invention, the threaded locking component includes a conical locking plate. The outer wall of the conical locking plate has a conical inclined surface that gradually increases from one end to the other. A conical countersunk hole is provided at the stop structure. Several conical locking plates are assembled into a ring and abut against the conical countersunk hole under the push of the elastic element. The conical hole inclined surface and the conical inclined surface of the conical countersunk hole have the same inclination angle and fit together. The inner side of the conical locking plate has a toothed shape that matches the external thread of the end of the double-ended connecting rod. The end of the double-ended connecting rod can be easily inserted into the inner side of the toothed shape of the conical locking plate. The conical locking plates are expanded apart from each other and surround the end of the double-ended connecting rod under the push of the elastic element. The external thread of the end of the double-ended connecting rod is engaged with the inner side of the conical locking plate and cannot be pulled out. As the engagement length increases, the conical inclined surface of the conical locking plate gradually moves closer to the rotating part until it abuts and is fixed on the conical hole inclined surface.

[0012] As a further improvement of the present invention, the locking nut is pushed by the elastic element, and the nut plane abuts against the horizontal abutment surface. When the end of the double-ended connecting rod is inserted, the locking nut is squeezed by the double-ended connecting rod, overcoming the elastic force of the elastic element, and moves along the axis towards the bottom wall of the inner cavity of the female connector shell. The locking nut is stuck by the inner cavity wall of the female connector shell and cannot rotate. When the double-ended connecting rod rotates, the locking nut can engage with the external thread of the end of the double-ended connecting rod, and as the engagement length increases, it gradually moves towards the rotating part until the nut plane abuts and is fixed against the horizontal abutment surface.

[0013] As a further improvement of the present invention, the connection portion between the double-ended connecting rod and the female connector is filled with a hardening material.

[0014] As a further improvement of the present invention, the prefabricated component is provided with a channel through which the driving end of the locking tool can extend into the connecting rotating part.

[0015] The present invention also provides a locking tool specifically for bidirectional tightening operation of the aforementioned double-ended pre-tightening connector, comprising an insertion part and a driving part. The end of the insertion part is provided with a driving end, which can cooperate with the rotating part for transmission. When operating the locking tool, rotating the locking tool drives the driving end to rotate, providing rotational driving force to the rotating part to drive the double-ended connecting rod to rotate around an axis.

[0016] As a further improvement of the present invention, the insertion part of the locking tool is a slender rod, which allows the driving end to extend into the channel, connect to and drive the rotating part.

[0017] As a further improvement of the present invention, the driving end and the rotating part are connected by a toothed connection for rotational transmission. Alternatively, the driving end and the rotating part are connected by an abutment connection for rotational transmission. Still another option is that the driving end and the rotating part are connected by a helical connection for rotational transmission.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: In the prior art, the locking and fixing of mechanical connectors requires the use of two parts, a male connector and a female housing. However, the present invention eliminates the need for the male connector through improvement and optimization, and no longer requires the use of male and female housings in production. This reduces the manufacturing cost of the present invention and improves the production efficiency of double-headed pre-tightening connector components.

[0019] This invention improves upon the double-ended connecting rod by adding a locking drive structure, which can lock the connection between the double-ended connecting rod and the female connector by driving the rotating part after the prefabricated components are connected and installed, and maintain a certain anti-loosening pre-tightening force, thus solving the problem of potential loosening risk in the locking of mechanical joints in the prior art.

[0020] After the double-ended connecting rod is engaged with the female connector and its internal parts, the present invention uses a solidified and hardened material to fill and seal the interior, which has the effect of preventing corrosion failure and loosening of the double-ended pre-tightened connector.

[0021] This invention uses a locking tool to drive and adjust the thread engagement length between the double-ended connecting rod and the female connector, which can tighten the connection gap between prefabricated components. By installing multiple double-ended pre-tightening connectors on the mounting surface between prefabricated components, the prefabricated components can achieve a gapless pre-tightening connection, avoiding uneven stress distribution caused by differences in connection gaps between different double-ended pre-tightening connectors, which could lead to damage to the connectors themselves.

[0022] The installation and operation of this invention are relatively convenient, the components of the connector are relatively simple, and it is easy to operate in practice, which brings convenience to actual on-site construction. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural diagram of the double-ended connecting rod of the present invention when both ends are locked with tapered locking plates; Figure 2 This is a cross-sectional structural diagram illustrating the mating relationship between the conical locking plate and the internal components of the female housing according to the present invention; Figure 3 This is a cross-sectional structural diagram of the double-ended connecting rod of the present invention when both ends are locked with locking nuts; Figure 4 This is a cross-sectional structural schematic diagram showing the fit between the locking nut and the internal components of the female housing according to the present invention; Figure 5 This is a schematic cross-sectional view of the double-ended connecting rod of the present invention when its two ends are respectively locked with a tapered locking plate and a locking nut; Figure 6 This is a schematic diagram of the contact surface between the threaded locking element and the stop structure of the present invention; Figure 7 This is a schematic diagram of the structure of the double-headed connecting rod of the present invention; Figure 8 This is a schematic diagram of the locking tool and the driving end for locking according to the present invention; Figure 9 This is a schematic diagram showing the engagement of the drive end of the locking tool of the present invention with the drive teeth of the double-ended connecting rod; Figure 10 This is a schematic diagram of the intermediate nut, tapered locking plate, and locking nut of the present invention; Figure 11 This is a schematic diagram of the structure of the female connector shell of the present invention having a regular polygonal cavity inside; Figure 12 This is a schematic diagram of the meshing transmission between the worm gear and the helical gear of the present invention; Figure 13 This is a schematic diagram of the drive tooth groove and punch transmission according to the present invention; Figure 14 This is a schematic cross-sectional view of the drive tooth groove and punch transmission of the present invention. Figure 15 This is a schematic diagram of the worm gear tooth structure of the present invention; Figure 16 This is a schematic diagram of the drive tooth groove of the present invention; Figure 17 This is a schematic diagram of the anti-return tooth surface structure of the conical locking plate of the present invention; Figure 18 This is a schematic diagram of the anti-reverse tooth surface structure of the double-headed connecting rod of the present invention; Explanation of the labels in the diagram: 1. Female connector shell; 2. Double-ended connecting rod; 3. Precast component; 4. Locking tool; 101. Intermediate nut; 1011. Intermediate nut with conical hole; 1012. Intermediate nut with flat surface; 1013. Conical hole bevel; 1014. Horizontal abutment surface; 102. Conical locking plate; 1021. Conical bevel; 103. Locking nut; 1031. Nut plane; 104. Bottom wall step; 105. Locking through hole; 110. Internal tooth punching surface; 111. Internal tooth check surface; 201. Rotating part; 202. Drive tooth; 203. Worm gear tooth; 204. Drive tooth groove; 210. Tooth-shaped punching surface; 211. Tooth-shaped check surface; 301. Reinforcing bar; 302. Channel; 401. Drive end; 402. Helical tooth; 403. Drive punch; 410. Handle; 411. Rod body. Detailed Implementation

[0024] In the description of this application, it should be noted that the terms "upper", "lower", "inner side", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific drawings provided. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Specific Implementation Example 1: Please refer to the appendix Figures 1-18 , A double-ended pre-tightening connector includes a female connector, a double-ended connecting rod 2, and a prefabricated component 3. The female connector includes a female connector shell 1, a threaded locking element, a retaining structure, and an elastic element.

[0026] The baffle structure at the outlet of the female housing 1 cavity can be set as an intermediate nut 101, the threaded locking element can be set as a conical locking plate 102, the intermediate nut 101 corresponds to the conical locking plate 102, and is set as a conical hole intermediate nut 1011, and the elastic element is set as a support spring.

[0027] The female connector 1 is a cylindrical part with an internal cylindrical cavity. One end of the female connector 1 has a locking through hole 105 connecting to the internal cavity, and the other end has a hexagonal nut structure. The central threaded hole of the hexagonal nut structure connects to the internal cavity, and the diameter of the internal cavity is larger than the diameter of the central threaded hole of the hexagonal nut structure, forming a bottom wall step 104 at the junction. The thread of the hexagonal nut matches the external thread of the reinforcing bar 301 in the prefabricated component 3, and the female connector 1 can be screwed and fixed to the reinforcing bar 301.

[0028] A tapered nut 1011 is provided at the lock connection hole 105, such as... Figure 10 As shown, the center of the tapered hole nut 1011 has a vertical through hole with a diameter larger than the end diameter of the double-ended connecting rod 2. One end of the through hole of the tapered hole nut 1011 has an inwardly recessed hexagonal countersunk hole, and the other end has a tapered countersunk hole that gradually tapers from the end to the middle, forming a tapered bevel 1013. The outer wall of the tapered hole nut 1011 and the inner wall of the locking through hole 105 are both threaded. Through the hexagonal countersunk hole, the tapered hole nut 1011 can be screwed and fixed to the locking through hole 105.

[0029] The outer wall of the tapered locking plate 102 has a tapered slope 1021 that gradually increases from one end to the other, and the inner side has a tooth shape that matches the end external thread of the double-ended connecting rod 2. The three tapered locking plates 102 are surrounded together, and their inner sides together form a threaded hole that matches the end external thread of the double-ended connecting rod 2.

[0030] One end of the support spring abuts against the bottom wall step 104, and the other end abuts against the larger end of the three tapered locking plates 102, pushing the three tapered locking plates 102 to abut against the tapered countersunk hole of the tapered nut 1011 in the middle of the tapered hole.

[0031] Both ends of the double-ended connecting rod 2 are provided with external threads in opposite directions, and the ends of the external threads are provided with chamfers. The middle part of the double-ended connecting rod 2 is provided with a cylindrical rotating part 201 extending radially, and a ring of axially protruding driving teeth 202 is provided on the plane of the rotating part 201.

[0032] Installation steps and principles: The female connector shell 1 is pre-tightened and installed with the reinforcing bar 301 and cast together with the reinforcing bar 301 into the precast component 3. Before the precast component 3 is hoisted on site, the support spring, conical locking plate 102 and conical hole intermediate nut 1011 are pre-installed in the female connector shell 1 as described above. After the first precast component 3 is hoisted into place, one end of the double-ended connecting rod 2 passes through the conical hole intermediate nut 1011 and presses the three conical locking plates 102 in the female connector shell 1 against the support spring side. The chamfer at the end of the external thread is inserted and expands the three conical locking plates 102. The three conical locking plates 102 separate from each other, creating a certain gap. Under the action of the support spring, they are still arranged in a ring around the end external thread of the double-ended connecting rod 2, and the inner teeth of the three conical locking plates 102 are all engaged and fixed with the end external thread of the double-ended connecting rod 2. After the prefabricated component 3 is hoisted into place, the other end of the double-ended connecting rod 2 is inserted into the female connector shell 1 as described above.

[0033] Furthermore, the double-headed preload connector is tightened using locking tool 4.

[0034] The locking tool 4 is a specially designed screwdriver, including a handle 410, a rod 411, and a drive end 401. One end of the handle 410 is provided with the rod 411, and the end of the rod 411 is provided with the drive end 401. The drive end 401 is provided with a toothed bit that matches the drive teeth 202.

[0035] A channel 302 is provided on the prefabricated component 3, which leads vertically to the rotating part 201. The drive end 401 of the screwdriver is inserted into the channel 302, such as... Figures 8-9 As shown, the drive end 401 engages with the drive tooth 202 to provide rotational force to the rotating part 201, driving the double-ended connecting rod 2 to rotate. The external threads at both ends of the double-ended connecting rod 2, with opposite directions of rotation, are screwed into the threaded holes formed by their respective matching tapered locking plates 102. As the thread engagement length increases, the tapered locking plates 102 continuously move towards the rotating part 201, and the tapered inclined surface 1021 and the tapered hole inclined surface 1013 abut tightly, thereby generating and maintaining an axial tension force between the female connector shell 1 and the double-ended connecting rod 2, so as to tighten and install the prefabricated components 3 connected at both ends, and finally achieve a seamless connection.

[0036] In particular, to match the different lengths of channels 302 opened on the prefabricated component 3 in actual use, the rod 411 on the screwdriver is slender, so as to ensure that the toothed bit of the drive end 401 can connect to and drive the rotating part 201 after it extends into the channel 302.

[0037] Optional, such as Figures 17-18As shown, the external thread of the double-ended connecting rod 2 and the inner tooth profile of the tapered locking plate 102 are both provided with an offset angle of the tooth profile angle. The inner tooth profile of the tapered locking plate 102 has an internal tooth punching surface 110 on the side facing the smaller end and an internal tooth check surface 111 on the side away from the smaller end. The angle between the internal tooth punching surface 110 and the axis is smaller than the angle between the internal tooth check surface 111 and the axis. The external thread of the double-ended connecting rod 2 has a toothed check surface 211 on the side facing the rotating part 201 and a toothed punching surface 210 on the side away from the rotating part 201. The angle between the toothed punching surface 210 and the axis is smaller than the angle between the toothed check surface 211 and the axis. After the external thread end of the double-ended connecting rod 2 is inserted into the inner tooth of the tapered locking plate 102, when it is pulled out, the toothed check surface 211 abuts against the inner toothed check surface 111, forming a ratchet-like meshing structure, which makes the double-ended connecting rod 2 only able to be inserted forward and unable to be retracted, thus ensuring a stable meshing.

[0038] Optionally, the channel 302 on the precast component 3 is arranged in a bidirectional through-through manner, and locking operations can be performed on both sides of the precast component 3 during installation. Two screwdrivers can be used to lock it from both sides at the same time to achieve a more secure connection.

[0039] Furthermore, a sealing operation is required during the locking and installation process.

[0040] Before installation, an appropriate amount of structural adhesive or glass glue can be injected into the female connector. After installation, the double-ended connecting rod 2 is inserted into the female connector and tightened with the locking tool 4. The structural adhesive or glass glue in the female connector can prevent the threaded connection from loosening and corroding. Alternatively, the channel 302 can be sealed with elastic fillers such as rubber or wooden plugs first, and then an injection device can be used to inject liquids such as water glass or cement slurry into the internal components of the double-ended pre-tightening connector through the elastic filler of the channel 302. After the water glass or cement slurry hardens, it can achieve corrosion prevention and anti-loosening of the internal components of the double-ended pre-tightening connector. Specific Implementation Example 2:

[0042] like Figures 10-11 As shown, The conical locking plate 102 of one specific embodiment is replaced by a locking nut 103, and the conical hole center nut 1011 is replaced by a flat center nut 1012. The locking nut 103 is a regular hexagonal nut with a horizontal nut plane 1031 at the end. The locking nut 103 has a threaded hole that matches the external thread at the end of the double-ended connecting rod 2. The end of the flat center nut 1012 has a horizontal abutment surface 1014. The inner wall of the female connector 1 is as follows: Figure 11 As shown, they are arranged in a regular hexagonal pattern, matching the outer edge of the regular hexagonal shape of the locking nut 103. The inner wall of the regular hexagonal cavity of the female housing 1 is larger than the outer edge of the regular hexagonal shape of the locking nut 103. The female housing 1 can restrict the locking nut 103 to slide along the axis within its cavity, but not rotate.

[0043] Working principle: When the end of the double-ended connecting rod 2 is inserted, the locking nut 103 will slide against the support spring end. When the double-ended connecting rod 2 is driven to rotate, the end of the double-ended connecting rod 2 will be screwed into the locking nut 103 through a threaded engagement. The locking nut 103 is limited by the hexagonal cavity wall of the female connector shell 1 and cannot rotate freely. As the double-ended connecting rod 2 rotates, the locking nut 103 will gradually be threaded onto the external thread of the double-ended connecting rod 2. As the double-ended connecting rod 2 continues to rotate, the locking nut 103 moves towards the rotating part 201 until the nut plane 1031 abuts and is fixed to the horizontal abutment surface 1014. This generates and maintains an axial tension force between the female connector shell 1 and the double-ended connecting rod 2, so as to tighten and install the prefabricated components 3 connected at both ends, and finally achieve a seamless connection. Specific Implementation Example 3:

[0045] Based on the second specific embodiment, the hexagonal corners of one end of the locking nut 103 are removed or only the corners of the locking nut 103 away from the supporting spring are retained. The regular hexagonal inner cavity of the female connector shell 1 is expanded outward near the abutting end, forming a cavity that can freely rotate around the axis when the locking nut 103 abuts against the middle nut 1012 of the plane. As described in the working principle of the second specific embodiment, after the locking nut 103 abuts and is fixed to the horizontal end face of the middle nut 1012 of the plane, the double-headed connecting rod 2 is rotated, and the locking nut 103 can rotate freely at the expanded inner cavity of the female connector shell 1.

[0046] Working principle: When the inner cavity of the female connector 1 is not enlarged, and there is a difference in the threaded length at both ends of the double-ended connecting rod 2, the locking nut 103 at one end will lock the rotation of the double-ended connecting rod 2 after it abuts against the end face of the flat middle nut 1012. If the other end is not screwed in, it will be in a loose state. However, after the inner cavity of the female connector 1 is improved and enlarged, the end that abuts first will not lock the rotation of the double-ended connecting rod 2, thus ensuring that the end that is not screwed in continues to be screwed in. Specific Implementation Example 4:

[0048] Combining specific embodiment one and specific embodiment three, such as Figure 5 As shown, the two ends of the double-ended connecting rod 2 are screwed and fixed to the conical locking plate 102 and the locking nut 103 respectively. The double-ended connecting rod 2 has a toothed angle offset at the end that meshes with the conical locking plate 102.

[0049] Preferred embodiment under the described assembly method: First, connect the end of the double-ended connecting rod 2 with the ordinary external thread to the locking nut 103 by rotation. Then, hoist the prefabricated component 3 with the conical locking plate 102 into place. After the prefabricated component 3 is hoisted into place, the corresponding double-ended connecting rod 2 is inserted into the female housing 1 of the conical locking plate 102.

[0050] After the conical locking plate 102, which forms an annular shape, is inserted into the end of the double-ended connecting rod 2, there is a gap between them. The female connector shell 1 at the end that is screwed to the locking nut 103 has an enlarged structure that allows the locking nut 103 to rotate freely. After the prefabricated component with the conical locking plate 102 is hoisted and inserted, the double-ended connecting rod 2 is rotated to lock the opposite spiral threads at both ends, gradually pulling the female connector shell 1 at both ends and the prefabricated component 3 connected to it closer and closer until the axial tensile stress is greater than the driving rotational force and the rotation stops.

[0051] When connected according to the above structure, it is possible to manually control the gap distance between two adjacent prefabricated components 3 at the final assembly. This ensures that when multiple double-headed pre-tightening connectors are installed on the same mounting surface of the same prefabricated component 3, the uneven stress distribution caused by the gap difference between different connectors will not damage the connectors themselves, leading to connection failure accidents. Specific Implementation Example 5:

[0053] Based on the above specific embodiments, by changing the structure of the rotating part of the double-headed connecting rod 2 and the form of the locking tool 4, a variety of optional driving methods can be achieved.

[0054] Optional, such as Figure 12 As shown, worm gear teeth 203 are provided on the outer peripheral wall of the rotating part 201, distributed around the axis of the double-headed connecting rod 2. The tooth profile of the worm gear teeth 203 is as follows: Figure 15 As shown, the tooth gradually thins from the root to the tip, and the locking tool 4 is replaced with a worm gear with helical teeth 402.

[0055] During locking, the helical teeth 402 and the worm gear teeth 203 mesh, and the worm with the helical teeth 402 rotates counterclockwise, driving the rotating part 201 to rotate clockwise at the same time, providing rotational force to the double-headed connecting rod 2, thereby locking the two female connector shells 1 and their connected prefabricated components 3.

[0056] Optional, such as Figures 13-14 As shown, seven drive tooth grooves 204 are formed on the outer peripheral wall of the rotating part 201. These seven drive tooth grooves 204 are evenly spaced around the axis of the double-ended connecting rod 2. The drive tooth grooves 204 extend and recess from the outer peripheral wall of the rotating part towards the axis of the double-ended connecting rod 2, forming two connected vertical walls. One side of the vertical wall of a single drive tooth groove 204 is wider than the other side, and the two vertical walls are perpendicular to each other. Correspondingly, the locking tool 4 is replaced with a screwdriver with a drive punch 403 at its end. The drive punch 403 is as follows... Figure 14As shown, the top of the drive punch 403 extends toward the axis and gradually widens toward the handle end, with its end being a rectangular plane.

[0057] During locking, the shorter side of the rectangular plane of the drive punch 403 is aligned with the narrower vertical wall of the drive tooth groove 204, so that the drive punch 403 abuts against this vertical wall. Figure 13 As shown, an axial force is applied to the screwdriver, and the axial force is transmitted to the drive tooth groove 204, which generates a tangential driving force on the rotating part 201 to drive the double-ended connecting rod 2 to rotate clockwise, thereby locking the two female connector shells 1 and their connected prefabricated components 3.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All variations, modifications, and substitutions within the spirit and principle of this design are within the protection scope of the present invention.

Claims

1. A double-ended pre-tightening connector, characterized in that: Includes female connector, double-ended connecting rod (2) and prefabricated components (3); The female connector is fixedly installed inside the prefabricated component (3); The two ends of the double-ended connecting rod (2) are respectively provided with external threads of opposite directions and a rotating part (201) is provided in the middle. Both ends of the double-ended connecting rod (2) are connected to female connectors. The double-ended connecting rod (2) can rotate when the rotating part (201) is subjected to rotational force. It is screwed into the female connector to generate axial tension force, which drives the female connectors at both ends to move towards the rotating part (201), thereby driving the prefabricated components (3) at both ends to fit together without gaps and lock and fix them under the action of axial tension force. The female connector includes a female housing (1), a threaded locking element, and a baffle structure. The female housing (1) is fixedly installed inside the prefabricated component (3), and one end of it has a cavity for accommodating the double-ended connecting rod (2). The threaded locking element is detachably installed inside the cavity of the female housing (1), and the threaded locking element has an internal thread that engages with the external thread at the end of the double-ended connecting rod (2). The cavity outlet of the female housing (1) contracts inward to form a baffle structure. The threaded locking element includes a locking nut (103), the outer peripheral wall of the locking nut (103) has a regular surface, which can be engaged with the inner cavity wall of the female housing (1), slide up and down along the axial direction, and cannot rotate around the central axis. The end of the locking nut (103) has a horizontal nut plane (1031), and the baffle structure has a horizontal abutment surface (1014). The internal cavity of the female connector (1) expands outward at the contact point between the locking nut (103) and the baffle structure. The inner circle of the expanded portion encloses the outer edge contour of the locking nut (103). As the engagement length of the external thread of the locking nut (103) and the end of the double-ended connecting rod (2) continuously increases, it gradually moves towards the rotating part (201). When it is translated to the expanded portion of the female connector (1), the outer edge of the locking nut (103) separates from the wall of the internal cavity of the female connector (1) and can rotate freely around the central axis in the expanded portion of the female connector (1).

2. A double-headed pre-tightening connector according to claim 1, characterized in that: It also includes a locking tool (4), which can extend into the prefabricated component (3) to provide rotational driving force for the rotating part (201) of the double-ended connecting rod (2); when the locking tool (4) drives the double-ended connecting rod (2) to continuously screw into the threaded locking member, it can drive the threaded locking member to move closer to the rotating part (201), abut against the baffle structure, and generate axial tension force on the female connector shell (1), thereby driving the locking and fixing of the prefabricated components (3) at both ends.

3. A double-ended pre-tightening connector according to claim 1, characterized in that: It also includes an elastic element, and an elastic element is provided in the cavity of at least one end of the female housing (1); one end of the elastic element abuts against the bottom wall of the inner cavity of the female housing (1), and the other end abuts against the threaded locking element. Under the elastic force of the elastic element, the threaded locking element has a tendency to move toward the rotating part (201).

4. A double-ended pre-tightening connector according to claim 3, characterized in that: The threaded locking component includes a tapered locking plate (102). The outer wall of the tapered locking plate (102) has a tapered inclined surface (1021) that gradually increases from one end to the other. A tapered countersunk hole is provided at the stop structure. Several tapered locking plates (102) are assembled into a ring and abut against the tapered countersunk hole under the push of the elastic element. The inclination angle of the tapered hole inclined surface (1013) and the tapered inclined surface (1021) of the tapered countersunk hole are consistent and fit together. The inner side of the tapered locking plate (102) has teeth that match the external thread at the end of the double-ended connecting rod (2). The end of the double-ended connecting rod (2) can be easily inserted into the inner side of the toothed conical locking plate (102). The conical locking plates (102) are expanded apart and surrounded by the end of the double-ended connecting rod (2) under the push of the elastic element. The external thread of the end of the double-ended connecting rod (2) is engaged with the inner toothed side of the conical locking plate (102) and cannot be pulled out. As the engagement length increases, the conical inclined surface (1021) of the conical locking plate (102) gradually moves closer to the rotating part (201) until it abuts and is fixed on the conical inclined surface (1013).

5. A double-headed pre-tightening connector according to claim 3, characterized in that: The locking nut (103) is pushed by the elastic element, and the nut plane (1031) abuts against the horizontal abutment surface (1014). When the end of the double-ended connecting rod (2) is inserted, the locking nut (103) is squeezed by the double-ended connecting rod (2), overcomes the elastic force of the elastic element, and moves along the axis towards the bottom wall of the inner cavity of the female connector shell (1). The locking nut (103) is stuck by the inner cavity wall of the female connector shell (1) and cannot rotate. When the double-ended connecting rod (2) rotates, the locking nut (103) can engage with the external thread of the end of the double-ended connecting rod (2), and as the engagement length increases, it gradually moves towards the rotating part (201) until the nut plane (1031) abuts against the horizontal abutment surface (1014) and is fixed.

6. A double-ended pre-tightening connector according to claim 1, characterized in that: The connection between the double-ended connecting rod (2) and the female connector is filled with a hardening material.

7. A double-ended pre-tightening connector according to claim 2, characterized in that: The prefabricated component (3) is provided with a channel (302) through which the drive end (401) of the locking tool (4) can extend into the connecting rotating part (201).

8. A locking tool for use in the double-headed preload connector of claim 7, characterized in that: It includes an insertion part and a driving part; the end of the insertion part is provided with a driving end (401), which can cooperate with the rotating part (201) for transmission; when the locking tool (4) is operated, the driving end (401) is driven to rotate by rotating the locking tool (4), and the rotation driving force is provided to the rotating part (201) to drive the double-headed connecting rod (2) to rotate around the axis.

9. A locking tool according to claim 8, characterized in that: The locking tool (4) has a long, thin rod (411) that allows the drive end (401) to extend into the channel (302) and connect to and drive the rotating part (201).

10. A locking tool according to claim 8, characterized in that: The drive end (401) and the rotating part (201) are connected by a toothed connection to perform rotational transmission; or, the drive end (401) and the rotating part (201) are connected by an abutment to perform rotational transmission; or, the drive end (401) and the rotating part (201) are connected by a helical connection to perform rotational transmission.

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