Double-end pre-tightening connector and locking tool

Abstract

The invention discloses a double-end pre-tightening connector and a locking tool, and relates to the technical field of fabricated constructions.The double-end pre-tightening connector is arranged between adjacent integrated modules or fabricated prefabricated parts, and specifically comprises a female joint, a double-end connecting rod and a prefabricated part; the female joints are fixedly arranged in the prefabricated parts and fixedly connected with reinforcing steel bars in the prefabricated parts, the two ends of the double-end connecting rod are in threaded fit with the female joints in the adjacent prefabricated parts respectively, and the double-end connecting rod can be driven by a locking tool to be locked to be connected with the female joints and keep certain anti-loosening pre-tightening force; in use, after the prefabricated parts are connected and locked through the double-end pre-tightening connector, a setting and hardening material is injected into the connector for sealing treatment, corrosion and loosening of a threaded connection part are prevented, and reliable connection and installation of the prefabricated parts can be achieved; the method has the advantages of simple and convenient operation steps, reliable connection and fixation and low implementation cost, and the industrialization degree of fabricated building construction can be remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of assembled buildings, in particular to a double-head pre-tightening connector and a locking tool. Background Art

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

[0003] Prefabricated construction refers to the transfer of a large number of on-site construction operations in traditional construction methods to factories. Components such as floor slabs, wall panels, stairs, balconies, etc. can be processed uniformly in the factory in advance and then transported to the site for assembly.

[0004] In order to ensure the reliable structural strength of prefabricated buildings, a reliable method is required to connect and fix the prefabricated components. In the utility model patent with patent publication number CN219690740U, a non-fixed end mechanical connection device (referred to as a mechanical joint) is disclosed, which includes a female connection and a male connection, and the male connection includes a connecting rod with a connecting rod body; the connecting rod body is clamped with the female connection fixed in the prefabricated part, and locked when the two are away from each other to provide a connecting tension when the prefabricated part is installed. This mechanical joint can adapt to the connection of large-sized prefabricated building prefabricated components, and has greatly improved the industrialization level of on-site construction of prefabricated buildings.

[0005] However, in the mechanical joint described above, the connecting rod body and the female connection fixed in the prefabricated part are in a one-way clamping check state, and the clamping engagement can only be achieved when the connecting rod body and the female connection are far away from each other, providing a connecting tension for the prefabricated component, and the clamping end thereof has the potential to loosen in the direction in which the connecting rod body and the female connection are close to each other. If the clamping end is not subjected to tension for a long time, there will be uncertainty in the connection of the prefabricated component, which will make people doubt the reliability of the prefabricated building. Although the utility model patent with patent publication number CN219690740U also discloses an improved scheme to increase the reliability of the mechanical joint connection, that is, to provide a preload force by using a tensioning and locking device to prop open the prefabricated components connected by the mechanical joint, so as to achieve the tension locking effect of the clamping end of the mechanical joint, the installation operation of the tensioning and locking device is difficult due to the large weight and large number of prefabricated components required to be connected by the mechanical joint, which is not conducive to the actual construction operation on site. In addition, after the prefabricated components are connected by such mechanical joints, it is inevitable that a gap margin will be generated on the installation surface, and the same installation surface of the same prefabricated component often requires multiple mechanical joints for connection. Since the mechanical gap margin generated by each mechanical joint cannot be controlled, the stress conditions of each mechanical joint will be different, which will affect the tensile effect of the overall structure. Summary of the invention

[0006] To sum up, in view of the shortcomings of the prior art, the purpose of the present invention is to provide a double-head pre-tightening connector that provides connection pre-tightening force in a more convenient way to avoid the risk of loose connection, and to controllably adjust the mechanical gap between pre-supported components to achieve seamless connection of prefabricated components.

[0007] In addition, the present invention also provides a special locking tool which is more convenient for realizing locking operation during the bidirectional tensioning operation of the double-head pre-tightening connector.

[0008] The first invention object of the present invention adopts the following scheme: A double-headed pre-tightening connector comprises a female joint, a double-headed connecting rod and a prefabricated component; the female joint is fixedly arranged in the prefabricated component; the two ends of the double-headed connecting rod are respectively provided with external threads of opposite rotation directions and a rotating part is provided in the middle thereof; both ends of the double-headed connecting rod are connected to a female joint, and the double-headed connecting rod can rotate when the rotating part is subjected to a rotational force, and is screwed into the female joint to generate an axial tensioning force, driving the female joints at both ends to move toward the rotating part, thereby driving the prefabricated components at both ends to fit together without a gap, and are locked and fixed under the action of the axial tensioning force.

[0009] As a further improvement of the present invention, it also includes a locking tool, which can be inserted into the prefabricated component to provide a rotational driving force for the rotating part of the double-headed connecting rod. The female connector includes a female shell, a threaded lock and a baffle structure. The female shell is fixedly arranged in the prefabricated component, and one end of the female shell is provided with a cavity for accommodating the double-headed connecting rod. The threaded lock is detachably arranged in the cavity of the female shell, and the threaded lock is provided with an internal thread that cooperates with the external thread at the end of the double-headed connecting rod. The cavity outlet of the female shell contracts inward to form a baffle structure. When the locking tool drives the double-headed connecting rod to be continuously screwed into the threaded lock, it can drive the threaded lock to move closer to the rotating part and abut against the baffle structure, thereby generating an axial tensioning force on the female shell, thereby driving the locking and fixing of the prefabricated components at both ends.

[0010] As a further improvement of the present invention, an elastic member is further included, and an elastic member is disposed in the cavity of at least one end of the female shell. One end of the elastic member abuts against the bottom wall of the inner cavity of the female shell, and the other end abuts against the thread lock member. The thread lock member has a tendency to move toward one side of the rotating part under the elastic force of the elastic member.

[0011] As a further improvement of the present invention, the threaded locking piece includes a conical locking piece, the outer wall of which has a conical inclined surface that gradually increases from one end to the other end, and a conical countersunk hole is provided at the stop structure. A plurality of conical locking pieces are assembled into a ring shape, and abut against the conical countersunk hole under the push of the elastic member. The conical hole inclined surface of the conical countersunk hole is consistent with the inclination angle of the conical inclined surface, and fits each other. The inner side of the conical locking piece has a tooth shape that matches the external thread at the end of the double-headed connecting rod, and the end of the double-headed connecting rod can be easily inserted into the inner side of the tooth shape of the conical locking piece. The conical locking pieces are expanded apart from each other and are enclosed at the end of the double-headed connecting rod under the push of the elastic member. The external thread at the end of the double-headed connecting rod is meshed with the inner side of the conical locking piece and cannot be pulled out. As the meshing length increases, the conical inclined surface of the conical locking piece 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 threaded locking member includes a locking nut, the outer peripheral wall of the locking nut is formed with a regular profile, which can be clamped on the inner cavity wall of the female shell, slide up and down along the axis, and cannot rotate around the central axis. A horizontal nut plane is formed at the end of the locking nut, and a horizontal abutment surface is formed at the stop structure. The locking nut is pushed by the elastic member, and the nut plane abuts on the horizontal abutment surface. When the end of the double-headed connecting rod is inserted, the locking nut is squeezed by the double-headed connecting rod, overcomes the elastic force of the elastic member, and moves along the axis toward the bottom wall of the inner cavity of the female shell. The locking nut is clamped by the inner cavity wall of the female shell and cannot rotate. When the double-headed connecting rod rotates, the locking nut can engage with the external thread of the end of the double-headed connecting rod, and as the length of the meshing screw connection continues to increase, it gradually moves to the side of the rotating part until the nut plane abuts and fixes with the horizontal abutment surface.

[0013] As a further improvement of the present invention, the internal cavity of the female shell expands outward at the junction of the locking nut and the baffle structure, and the inscribed circle of the expanded part envelopes the outer edge contour of the locking nut. When the engagement length of the locking nut and the end external thread of the double-headed connecting rod continues to increase, it gradually moves toward the rotating part and translates to the expanded part of the female shell. The outer edge of the locking nut is separated from the wall of the internal cavity of the female shell, and can rotate freely around the center axis in the expanded part of the female shell.

[0014] As a further improvement of the present invention, the connecting portion between the double-headed connecting rod and the female connector is filled with a setting and hardening material.

[0015] As a further improvement of the present invention, the prefabricated component is provided with a channel through which the driving end can extend into the connecting rotating part.

[0016] The present invention also provides a locking tool specifically used in the bidirectional tensioning operation of the double-head pre-tightening connector, comprising an insertion portion and a driving portion. The end of the insertion portion is provided with a driving end, and the driving end can cooperate with the rotating portion for transmission. When operating the locking tool, the driving end is driven to rotate by rotating the locking tool, providing a rotational driving force to the rotating portion to drive the double-headed connecting rod to rotate around the axis.

[0017] As a further improvement of the present invention, the insertion portion of the locking tool is a slender rod, which enables the driving end to extend into the channel to connect and drive the rotating portion.

[0018] As a further improvement of the present invention, the driving end and the rotating part are connected and matched with each other in a toothed manner for rotation transmission. Alternatively, the driving end and the rotating part are connected and matched with each other in abutment manner for rotation transmission. Alternatively, the driving end and the rotating part are connected and matched with each other in a spiral manner for rotation transmission.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. In the prior art, the locking and fixing of mechanical connectors requires the cooperation of two parts, namely, a male connector and a female connector shell. However, the present invention eliminates the male connector through improvement and optimization, and no longer requires the cooperation of male and female connector shells in production and use, thereby reducing the use and manufacturing cost of the technology of the present invention and improving the production efficiency of the double-head pre-tightening connector components.

[0020] 2. The present invention improves and adds a locking drive structure on the double-headed connecting rod, which can lock the connection between the double-headed connecting rod and the female joint and maintain a certain anti-loosening pre-tightening force by driving the rotating part after the prefabricated components are connected and installed, thereby solving the problem of potential loosening risk of the locking of mechanical joints in the prior art.

[0021] 3. After the double-headed connecting rod is engaged with the female connector and its internal parts, the present invention uses a coagulation hardening material for filling and sealing, which has the effect of preventing corrosion failure and loosening of the double-headed pre-tightening connector.

[0022] 4. The present invention can tighten the connection gap between prefabricated components by driving the locking tool to adjust the threaded engagement length of the double-headed connecting rod and the female connector. A plurality of double-headed pre-tightening connectors are installed on the mounting surface between the prefabricated components, so that the prefabricated components can be pre-tightened without gaps, thereby avoiding uneven stress distribution due to differences in connection gaps between different double-headed pre-tightening connectors, which may lead to damage to the connector itself.

[0023] 5. The installation operation of the present invention is relatively convenient, the components of the connector are relatively simple, and it is easy to actually operate, which brings convenience to actual on-site construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional structure diagram of the double-ended connecting rod of the present invention when both ends are locked with the conical locking pieces; Figure 2 It is a cross-sectional structural schematic diagram of the matching relationship between the conical locking piece of the present invention and the inner component of the female housing; Figure 3 It is a schematic cross-sectional structure diagram of the double-ended connecting rod of the present invention when both ends are locked with locking nuts; Figure 4 It is a cross-sectional structural schematic diagram of the matching relationship between the locking nut of the present invention and the inner component of the female housing; Figure 5 It is a schematic cross-sectional structure diagram of the double-ended connecting rod of the present invention when both ends are locked with the conical locking piece and the locking nut respectively; Figure 6 It is a schematic diagram of the abutment surface between the thread locking element and the stop structure of the present invention; Figure 7 It is a schematic structural diagram of the double-ended connecting rod of the present invention; Figure 8 It is a structural schematic diagram of the locking tool and the driving end head for locking of the present invention; Fig. 9 It is a schematic diagram of the driving end of the locking tool of the present invention meshing with the driving teeth of the double-headed connecting rod; Fig.10 Schematic diagrams of the intermediate nut, the conical locking piece, and the locking nut of the present invention; Fig.11 It is a schematic diagram of the structure of a regular polygonal cavity formed in the female connector shell of the present invention; Fig.12 It is a schematic diagram of the meshing transmission of the worm gear and the helical gear of the present invention; Fig.13 It is a schematic diagram of the driving tooth groove and the punch cooperation transmission of the present invention; Fig.14 It is a schematic cross-sectional structure diagram of the driving tooth groove and the punch cooperative transmission of the present invention; Fig.15It is a schematic structural diagram of the worm gear of the present invention; Fig.16 It is a schematic diagram of the structure of the driving tooth groove of the present invention; Fig.17 It is a schematic diagram of the non-return tooth surface structure of the conical locking piece of the present invention; Fig.18 It is a schematic diagram of the non-return tooth surface structure of the double-ended connecting rod of the present invention; Description of the numbers in the figure: 1. Female housing; 2. Double-headed connecting rod; 3. Prefabricated component; 4. Locking tool; 101. Intermediate nut; 1011. Conical hole intermediate nut; 1012. Planar intermediate nut; 1013. Conical hole inclined surface; 1014. Horizontal abutment surface; 102. Conical locking piece; 1021. Conical inclined surface; 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. Driving tooth; 203. Worm gear tooth; 204. Driving tooth groove; 210. Tooth-shaped punching surface; 211. Tooth-shaped check surface; 301. Rebar; 302. Channel; 401. Driving end; 402. Helical tooth; 403. Driving punch; 410. Handle; 411. Rod body. DETAILED DESCRIPTION

[0025] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the specific drawings provided, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0026] Specific embodiment 1: Please refer to the attached Figure 1-Figure 18 , A double-head pre-tightening connector comprises a female connector, a double-head connecting rod 2 and a prefabricated component 3. The female connector comprises a female connector shell 1, a threaded locking member, a stop structure and an elastic member.

[0027] The stop structure at the cavity outlet of the female shell 1 can be set as an intermediate nut 101, the threaded locking piece can be set as a conical locking piece 102, the intermediate nut 101 corresponds to the conical locking piece 102 and is set as a tapered hole intermediate nut 1011, and the elastic piece is set as a supporting spring.

[0028] The female housing 1 is a cylindrical part with a cylindrical cavity inside. One end of the female housing 1 is provided with a locking hole 105 connected to the internal cavity, and the other end is provided with a hexagonal nut structure. The central screw hole of the hexagonal nut structure is connected to the internal cavity, and the diameter of the internal cavity is larger than the central screw hole diameter of the hexagonal nut structure, and a circle of bottom wall steps 104 is formed at the intersection of the connection. The thread of the hexagonal nut matches the external thread of the steel bar 301 in the prefabricated component 3, and the female housing 1 can be screwed and fixed on the steel bar 301 through the hexagonal nut structure.

[0029] The lock through hole 105 is provided with a tapered hole intermediate nut 1011, such as Fig.10 As shown, a vertical through hole is formed in the center of the tapered hole middle nut 1011, and the diameter of the through hole is larger than the end diameter of the double-headed connecting rod 2. One end of the through hole of the tapered hole middle nut 1011 is recessed inwardly and is formed with an inner hexagonal countersunk hole, and the other end is formed with a tapered countersunk hole that gradually shrinks and recesses from the end to the middle, forming a circle of tapered hole inclined surface 1013. The outer wall of the tapered hole middle nut 1011 and the inner wall of the locking through hole 105 are both threaded, and the tapered hole middle nut 1011 can be screwed and fixed to the locking through hole 105 through the inner hexagonal countersunk hole.

[0030] The outer wall of the conical locking piece 102 has a conical inclined surface 1021 which gradually increases from one end to the other end, and the inner side has a tooth shape matching the end external thread of the double-headed connecting rod 2. The three conical locking pieces 102 are enclosed together, and their inner sides jointly enclose a threaded hole matching the end external thread of the double-headed connecting rod 2.

[0031] 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 conical locking pieces 102 , pushing the three conical locking pieces 102 to abut against the conical countersunk hole of the conical hole middle nut 1011 .

[0032] Both ends of the double-ended connecting rod 2 are provided with external threads with opposite rotation 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 radially extending cylindrical expansion portion 201, and a circle of axially protruding driving teeth 202 is provided on the plane of the expansion portion 201.

[0033] Installation steps and principles: The female housing 1 is pre-screwed and installed with the steel bar 301 and cast into the prefabricated component 3 together with the steel bar 301. Before the prefabricated component 3 is hoisted on site, the support spring, the conical locking piece 102 and the tapered hole intermediate nut 1011 are pre-installed in the female housing 1 as described above. After the prefabricated component 3 installed first is hoisted in place, one end of the double-headed connecting rod 2 passes through the tapered hole intermediate nut 1011, and the three conical locking pieces 102 in the female housing 1 are pressed toward the side of the support spring. The chamfer of the external thread end is inserted and expanded into the three conical locking pieces 102. The three conical locking pieces 102 are separated from each other, generating a certain gap. Under the action of the thrust of the support spring, they are still arranged in a ring around the end external thread of the double-headed connecting rod 2, and the inner teeth of the three conical locking pieces 102 are all clamped and fixed with the end external thread of the double-headed connecting rod 2. After the prefabricated component 3 is subsequently installed and hoisted into place, the other end of the double-headed connecting rod 2 is inserted into the female connection shell 1 in the manner described above.

[0034] Furthermore, the locking tool 4 is used to perform a locking operation on the double-head pre-tightening connector.

[0035] The locking tool 4 is a special screwdriver, including a handle 410, a rod body 411 and a driving end 401. The handle 410 is provided with a rod body 411 at one end, and the driving end 401 is provided at the end of the rod body 411. The driving end 401 is provided with a toothed screwdriver bit matching the driving teeth 202.

[0036] A channel 302 is provided on the prefabricated component 3 and is vertically connected to the rotating part 201. The driving end 401 of the screwdriver is inserted into the channel 302. Figure 8-Figure 9 As shown, the driving end 401 engages with the driving teeth 202 to provide a rotational force for the rotating part 201, driving the double-headed connecting rod 2 to rotate. The external threads at both ends of the double-headed connecting rod 2 with opposite rotation directions are screwed into the threaded holes formed by the respective matching conical locking pieces 102. As the thread engagement length continues to increase, the conical locking piece 102 continues to move toward the rotating part 201, and the conical inclined surface 1021 is tightly abutted against the conical hole inclined surface 1013, so that an axial tension force is generated and maintained between the female shell 1 and the double-headed connecting rod 2, so as to tighten and install the prefabricated components 3 connected at both ends, and finally achieve a seamless connection.

[0037] In particular, in order to match the channels 302 of different lengths opened on the prefabricated component 3 in actual use, the rod body 411 on the screwdriver is slender to ensure that the toothed bit of the driving end 401 can connect to and drive the rotating part 201 after extending into the channel 302.

[0038] Optional, such as Figure 17-Figure 18As shown, the external thread of the double-headed connecting rod 2 and the inner tooth profile of the conical locking piece 102 are both provided with an offset angle of the tooth profile angle. The inner tooth profile of the conical locking piece 102 is provided with an inner tooth punching surface 110 on the side facing the smaller end, and an inner tooth check surface 111 on the side facing away from the smaller end, and the angle between the inner tooth punching surface 110 and the axis is smaller than the angle between the inner tooth check surface 111 and the axis; the external thread of the double-headed connecting rod 2 is provided with a tooth check surface 211 on the side facing the rotating part 201, and a tooth punching surface 210 on the side facing away from the rotating part 201, and the angle between the tooth punching surface 210 and the axis is smaller than the angle between the tooth check surface 211 and the axis. After the external threaded end of the double-headed connecting rod 2 is inserted into the inner tooth profile of the conical locking plate 102, when it is pulled out, the toothed check surface 211 abuts against the internal toothed check surface 111, forming an engagement structure similar to ratchet teeth, so that the double-headed connecting rod 2 can only be inserted forward and cannot be withdrawn, thereby ensuring the stability of the engagement.

[0039] Optionally, the channel 302 on the prefabricated component 3 is arranged in a bidirectional through-going manner, and locking operations can be performed on both sides of the prefabricated component 3 during installation, and two screwdrivers can be used to lock from both sides at the same time to achieve a more secure connection.

[0040] Furthermore, a sealing operation is required during the locking installation process.

[0041] Before installation, an appropriate amount of structural glue or glass glue can be injected into the female connector. After the installation is completed, the double-headed connecting rod 2 is inserted into the female connector and the connection is tightened with the locking tool 4. The structural glue or glass glue in the female connector can prevent the loosening and corrosion of the threaded connection; or first use elastic fillers such as rubber and cork to seal the channel 302, and then use an injection device to penetrate through the elastic filler in the channel 302, and inject liquids such as water glass or cement slurry into the internal components of the double-headed pre-tightening connector. After the water glass or cement slurry hardens, it can achieve corrosion protection and loosening prevention of the inside of the double-headed pre-tightening connector. Specific embodiment 2:

[0043] like Figure 10-11 As shown, The conical locking piece 102 of the first embodiment is replaced by a locking nut 103, and the conical hole intermediate nut 1011 is replaced by a flat intermediate nut 1012. The locking nut 103 is a regular hexagonal nut, and a horizontal nut plane 1031 is formed on the end thereof. A threaded hole matching the end external thread of the double-headed connecting rod 2 is formed in the locking nut 103, and a horizontal abutting surface 1014 is formed on the end of the flat intermediate nut 1012. The inner cavity wall of the female housing 1 is as shown in FIG. Fig.11 As shown, they are arranged in a regular hexagon, matching the regular hexagonal outer edge of the locking nut 103. The inner wall of the regular hexagonal cavity of the female shell 1 is larger than the regular hexagonal outer edge of the locking nut 103. The female shell 1 can limit the locking nut 103 in its cavity to only slide along the axis but not rotate.

[0044] Working principle: When the end of the double-headed connecting rod 2 is inserted, the locking nut 103 will be pressed and slid toward the end of the supporting spring. When the double-headed connecting rod 2 is driven to rotate, the end of the double-headed connecting rod 2 will be screwed together with the locking nut 103. The locking nut 103 is limited by the regular hexagonal cavity wall of the female shell 1 and cannot rotate freely. It will gradually be threaded onto the external thread of the double-headed connecting rod 2 as the double-headed connecting rod 2 rotates. As the connecting rod 2 continues to rotate, the locking nut 103 moves toward the rotating part 201 until the nut plane 1031 is abutted and fixed with the horizontal abutment surface 1014, thereby generating and maintaining an axial tensioning force between the female shell 1 and the double-headed connecting rod 2, so as to tighten and install the prefabricated components 3 connected at both ends, and finally achieve a seamless connection. Specific embodiment three:

[0046] On the basis of the second specific embodiment, the hexagonal corners are cut off at one end of the locking nut 103 or only the corners of the locking nut 103 away from the support spring are retained, and the regular hexagonal inner cavity of the female shell 1 is expanded outward near the abutting end, so as to have a cavity that can accommodate the locking nut 103 and can rotate freely around the axis when it abuts against the planar middle nut 1012. As described in the working principle of the second specific embodiment, after the locking nut 103 is abutted and fixed with the horizontal end surface of the planar middle nut 1012, the double-headed connecting rod 2 continues to be rotated, and the locking nut 103 can rotate freely at the expanded inner cavity of the female shell 1.

[0047] Working principle: When the inner cavity of the female shell 1 is not enlarged, when there is a difference in the threaded connection lengths at both ends of the double-headed connecting rod 2, the locking nut 103 at one end abuts and fixes with the end face of the flat middle nut 1012, which will lock the rotation of the double-headed connecting rod 2. If the other end is not screwed into place, the end is in a loose state. When the inner cavity of the female shell 1 is improved and enlarged, the end that abuts earlier will not lock the rotation of the double-headed connecting rod 2, which can ensure that the end that is not screwed into place continues to be screwed into place. Specific embodiment four:

[0049] In combination with the first and third embodiments, Figure 5 As shown, the two ends of the double-headed connecting rod 2 are respectively screwed and fixed with the conical locking piece 102 and the locking nut 103, and the end of the double-headed connecting rod 2 that engages with the conical locking piece 102 is formed with an offset angle of the tooth angle.

[0050] When assembled in the manner described, the preferred embodiment is: First, one end of the double-headed connecting rod 2 with a common external thread is rotationally connected to the locking nut 103, and then the prefabricated component 3 with a conical locking piece 102 is hoisted into place. After the prefabricated component 3 is hoisted into place, the corresponding double-headed connecting rod 2 is inserted into the female shell 1 of the conical locking piece 102.

[0051] After one end of the annular conical locking piece 102 is inserted into the end of the double-headed connecting rod 2, there is a gap between them, and the female shell 1 at one end screwed to the locking nut 103 is provided with an enlarged structure that allows the locking nut 103 to rotate freely. After the prefabricated component with the conical locking piece 102 is hoisted and inserted, the double-headed connecting rod 2 is rotated and locked, and the oppositely rotating threads at both ends are locked at the same time, and the female shells 1 at both ends and the connected prefabricated components 3 are gradually tightened and brought closer together until the axial tensile stress is greater than the driving rotational force and the rotation stops.

[0052] When connected according to the above structure, it is possible to achieve artificial control of the gap distance of the final assembly of two adjacent prefabricated components 3, ensuring that when multiple double-head preloaded connectors are installed on the same installation surface of the same prefabricated component 3, the stress distribution caused by the gap difference between different connectors will not be uneven, which will damage the connector itself and cause a connection failure accident. Specific embodiment five:

[0054] On the basis of the above specific embodiments, the rotating part structure of the double-headed connecting rod 2 and the form of the locking tool 4 are changed to realize a variety of optional driving modes.

[0055] Optional, such as Fig.12 As shown, on the outer peripheral wall of the rotating part 201, there are worm gear teeth 203 distributed around the axis of the double-headed connecting rod 2. The tooth shape of the worm gear teeth 203 is as shown in FIG. Fig.15 As shown, the tooth gradually becomes thinner from the root to the end of the tooth, and the locking tool 4 is replaced by a worm with helical teeth 402.

[0056] When locking, the helical teeth 402 and the worm gear teeth 203 are meshed, 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 female shells 1 at both ends and the connected prefabricated components 3.

[0057] Optional, such as Figure 13-14 As shown, 7 driving tooth grooves 204 are formed on the outer peripheral wall of the rotating part 201, and the 7 driving tooth grooves 204 are evenly spaced around the axis of the double-headed connecting rod 2. The driving tooth grooves 204 extend from the outer peripheral wall of the rotating part to the axis of the double-headed connecting rod 2 to form two connected vertical walls. The width of the vertical wall on one side of a single driving tooth groove 204 is wider than that on 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 driving punch 403 at the end. The driving punch 403 is as shown in FIG. Fig.14As shown, the top end of the driving punch 403 extends toward the axis and gradually expands and widens toward the handle end, and the end portion thereof is a rectangular plane.

[0058] When locking, align the shorter side of the rectangular plane of the driving punch 403 with the narrower vertical wall of the driving tooth groove 204, so that the driving punch 403 abuts against the vertical wall. Fig.13 As shown, an axial force is applied to the screwdriver, and the axial force is transmitted to the driving tooth groove 204, generating a tangential driving force on the rotating part 201 to drive the double-headed connecting rod 2 to rotate clockwise, thereby locking the female shells 1 at both ends and the connected prefabricated components 3.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to be limiting. All variations, modifications, and substitutions within the spirit and principle of the design are within the protection scope of the present invention.

Claims

1. A double-ended preloaded connector, characterized in that: It comprises a female joint, a double-ended connecting rod (2) and a prefabricated component (3); The female joint is fixedly arranged in the prefabricated component (3); The two ends of the double-ended connecting rod (2) are respectively provided with external threads with opposite rotation directions and a rotating portion (201) is provided in the middle thereof; Both ends of the double-headed connecting rod (2) are connected to female joints. The double-headed connecting rod (2) can rotate when the rotating part (201) is subjected to a rotational force, and is screwed into the female joint to generate an axial tensioning force, driving the female joints at both ends to move toward the rotating part (201), thereby driving the prefabricated components (3) at both ends to fit together until there is no gap, and to be locked and fixed under the action of the axial tensioning force.

2. A double-ended preloaded connector according to claim 1, characterized in that: The invention also comprises a locking tool (4), which can be inserted into the prefabricated component (3) to provide a rotational driving force for the rotating part (201) of the double-headed connecting rod (2); the female joint comprises a female shell (1), a threaded locking part and a stop structure; the female shell (1) is fixedly arranged in the prefabricated component (3), and one end of the female shell is provided with a cavity for accommodating the double-headed connecting rod (2); the threaded locking part is detachably arranged in the cavity of the female shell (1), and the threaded locking part is provided with an internal thread that is matched and connected with the external thread at the end of the double-headed connecting rod (2); the cavity outlet of the female shell (1) is contracted inwardly to form a stop structure, and when the locking tool (4) drives the double-headed connecting rod (2) to be continuously screwed into the threaded locking part, the threaded locking part can be driven to move closer to the rotating part (201) and abut against the stop structure, thereby generating an axial tensioning force on the female shell (1), thereby driving the prefabricated components (3) at both ends to be locked and fixed.

3. A double-ended pre-tightening connector according to claim 2, characterized in that: It also comprises an elastic member, wherein at least one end of the female shell (1) has an elastic member disposed in the cavity; one end of the elastic member abuts against the bottom wall of the inner cavity of the female shell (1), and the other end abuts against the thread locking member; the thread locking member, driven by the elastic force of the elastic member, has a tendency to move towards one side of the rotating portion (201).

4. A double-ended pre-tightening connector according to claim 3, characterized in that: The thread lock comprises a conical locking piece (102), the outer wall of the conical locking piece (102) has a conical inclined surface (1021) which gradually increases from one end to the other end, the stop structure is provided with a conical countersunk hole, a plurality of conical locking pieces (102) are assembled into a ring shape, and are abutted in the conical countersunk hole under the push of the elastic member, the conical hole inclined surface (1013) of the conical countersunk hole and the conical inclined surface (1021) have the same inclination angle and fit each other; the inner side of the conical locking piece (102) has a toothed portion which matches the external thread of the end of the double-headed connecting rod (2). The end of the double-headed connecting rod (2) can be easily inserted into the inner side of the toothed shape of the conical locking piece (102), the conical locking pieces (102) are expanded relative to each other, and are enclosed at the end of the double-headed connecting rod (2) under the push of the elastic member; the outer thread at the end of the double-headed connecting rod (2) is meshed with the inner side toothed shape of the conical locking piece (102) and cannot be pulled out, and the conical inclined surface (1021) of the conical locking piece (102) gradually moves closer to the rotating part (201) as the meshing length increases, until it is abutted and fixed on the conical hole inclined surface (1013).

5. A double-ended pre-tightening connector according to claim 4, characterized in that: The threaded locking component comprises a locking nut (103), the outer peripheral wall of which is provided with a regular profile, capable of being clamped on the inner cavity wall of the female shell (1), sliding up and down along the axial direction, and unable to rotate around the central axis; a horizontal nut plane (1031) is provided at the end of the locking nut (103), and a horizontal abutment surface (1014) is provided at the stop structure; the locking nut (103) is pushed by the elastic member, and the nut plane (1031) abuts against the horizontal abutment surface (1014); the end of the double-headed connecting rod (2) is inserted When the double-headed connecting rod (2) is rotated, the locking nut (103) is squeezed by the double-headed connecting rod (2), overcomes the elastic force of the elastic member, and moves along the axis toward the bottom wall of the inner cavity of the female shell (1); the locking nut (103) is clamped by the inner cavity wall of the female shell (1) and cannot rotate. When the double-headed connecting rod (2) is rotated, the locking nut (103) can engage with the external thread at the end of the double-headed connecting rod (2), and as the length of the engaged screw connection continues to increase, the locking nut (103) gradually moves toward the rotating portion (201) until the nut plane (1031) is abutted and fixed with the horizontal abutment surface (1014).

6. A double-ended pre-tightening connector according to claim 5, characterized in that: The internal cavity of the female shell (1) expands outward at the abutment point between the locking nut (103) and the stop structure, and the inscribed circle of the expanded portion envelops the outer edge contour of the locking nut (103). When the engagement length of the locking nut (103) and the end external thread of the double-headed connecting rod (2) continues to increase, the locking nut (103) gradually moves toward the rotating part (201) and translates to the expanded portion of the female shell (1), the outer edge of the locking nut (103) is separated from the wall surface of the internal cavity of the female shell (1), and can freely rotate around the central axis of the expanded portion of the female shell (1).

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

8. The double-ended pre-tightening connector according to claim 1, characterized in that: The prefabricated component (3) is provided with a channel (302) through which the driving end (401) can extend into the connection rotating part (201).

9. A locking tool for the double-ended pre-tightening connector according to claim 2, characterized in that: It comprises an insertion portion and a driving portion; the end of the insertion portion is provided with a driving end (401), and the driving end (401) can cooperate with the rotating portion (201) for transmission; when the locking tool (4) is operated, the driving end (401) is driven to rotate by rotating the locking tool (4), thereby providing a rotational driving force to the rotating portion (201) to drive the double-headed connecting rod (2) to rotate around the axis.

10. A locking tool according to claim 8, characterized in that: The insertion portion of the locking tool (4) is a slender rod body (411), which enables the driving end (401) to be inserted into the channel (302) to connect and drive the rotating portion (201).

11. A locking tool according to claim 8, characterized in that: The driving end (401) and the rotating part (201) are connected in a toothed manner to perform rotational transmission; or, the driving end (401) and the rotating part (201) are connected in abutment manner to perform rotational transmission; or, the driving end (401) and the rotating part (201) are connected in a spiral manner to perform rotational transmission.

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