Prestress tensioning device for reinforced concrete sleeper

Abstract

The invention relates to the technical field of building machinery, in particular to a reinforced concrete sleeper prestress tensioning device which comprises a pedestal, a fixed cross beam and a mounting cross beam are arranged on the pedestal, a tensioning oil cylinder is arranged on the mounting cross beam, the tensioning oil cylinder is provided with a plurality of output rods, connecting pieces are arranged at the ends of the output rods, and the connecting pieces are connected with the fixed cross beam and the mounting cross beam. According to the prestressed tensioning device for the reinforced concrete sleeper, the sliding block horizontally moves along the sliding rail to be matched with the distance between the steel wires, the sliding rail integrally rotates to correct the angle of the steel wires, when the sliding block deviates to generate overturning moment, the steel wires are tensioned, and the steel wires are tensioned. The electromagnets on the two sides of the connecting plate generate reverse correction torque through the current difference, the sliding rail is forced to return to be horizontal, then unbalance loading stress caused by position adjustment is counteracted, and local abrasion of the sliding rail is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and particularly to a prestressed tensioning device for reinforced concrete sleepers. Background Technique

[0002] Prestressed concrete sleepers are an important part of China's railway system. Their production mainly adopts the pretensioning prestress process. When applying this process to produce prestressed concrete sleepers, a steel wire tensioning device is required to tension the prestressed steel wires.

[0003] The deflection of each prestressed steel wire to be tensioned, that is, the degree of bending, is different. Therefore, after cutting, the actual specified length of each prestressed steel wire will be different. And during the tensioning process, the tensioning ends of the prestressed steel wires move synchronously as a whole. After the tensioning is completed, the tensioning ends of each prestressed steel wire are at the same tensioning end position, that is, all the prestressed steel wires are tensioned by the same distance. Coupled with the difference in the specified length of each prestressed steel wire, this will cause the tensioning degree of each prestressed steel wire to be different, resulting in prestress deviation.

[0004] In view of the above problems, Chinese Patent: 202311474450.X proposes a prestressed sleeper tensioning force control device, which includes a tensioning module, a tensioning rod, and a locking module. The tensioning module includes a tensioning jack and a tensioning rod connector. The tensioning jack includes a plurality of cylinders provided with piston rods. The oil injection chambers between the plurality of cylinders are communicated with each other, and the oil return chambers are also communicated with each other. The piston rod is connected to the tensioning rod connector. The tensioning rod connector is temporarily connected to the tensioning rod during use. The outer wall of the tensioning rod is provided with a nut gear that is threadedly engaged therewith. The tensioning rod is provided with a tensioning stepped hole. The locking module includes a locking motor and a locking gear that meshes with the nut gear during use. The locking motor is connected to the locking gear. Each piston rod tensions a prestressed steel wire, and the plurality of piston rods are synchronously filled with oil and returned with oil, improving the phenomenon of excessive prestress deviation between the prestressed steel wires. The locking module can make the tensioning positioning time-saving and labor-saving.

[0005] It makes the tensile forces provided by each piston rod the same through the mutually connected oil injection chambers and oil return chambers in the cylinder. However, in the actual production operation of sleepers, the positions of the steel wires on different batches of sleepers are different. And the above-mentioned existing tensioning jack in the prior art is a non-standard device. When tensioning different batches of sleepers, the positions of its piston rods are fixed and it cannot flexibly adjust the spacing to adapt to the difference in the steel wire arrangement of different batches of sleeper molds. Non-standard tensioning jacks need to be customized for each batch of molds, resulting in repeated equipment design and increased production costs.

[0006] Therefore, we propose a prestressed tensioning device for reinforced concrete sleepers. Summary of the Invention

[0007] To solve the above technical problems, an embodiment of the present application provides a prestressed tensioning device for a reinforced concrete sleeper, which includes a pedestal. A fixed crossbeam and an installation crossbeam are arranged on the pedestal. A tensioning oil cylinder is arranged on the installation crossbeam. The tensioning oil cylinder is provided with a plurality of output rods. A connecting piece is arranged at the end of the output rod. The output rod is connected with a tensioning rod through the connecting piece. Both ends of the prestressed steel wire pass through the fixed crossbeam and are connected with the tensioning rod.

[0008] In some embodiments, both ends of the prestressed steel wire are fixedly connected with a pier head anchor, and a wedge clamp is further installed outside the prestressed steel wire, and an anchor plate is arranged outside the wedge clamp.

[0009] In some embodiments, the tensioning oil cylinder includes a cylinder body and a plurality of output rods arranged in the cylinder body. A plurality of sliding cavities for the output rods to slide are opened in the cylinder body. A common oil inlet cavity and a common oil outlet cavity are respectively arranged on the front and rear sides of the cylinder body. The plurality of sliding cavities are respectively communicated with each other through the common oil inlet cavity and the common oil outlet cavity.

[0010] In some embodiments, an extension rod is connected to the end of the output rod. The connecting piece is arranged outside the extension rod. The connecting piece includes a slide rail rotatably arranged at the end of the extension rod. A slider is slidably arranged in the slide rail. One end of the tensioning rod is connected with the slider. A lead screw threadedly penetrating the slider is rotatably arranged in the slide rail. A driving motor is arranged outside the slide rail. Belt pulleys are arranged on the output end of the driving motor and the outside of the lead screw. A belt is arranged outside the belt pulley. The driving motor drives the lead screw to rotate through belt transmission. A driving member for driving the slide rail to rotate is further arranged outside the extension rod.

[0011] In some embodiments, the driving member includes a collar arranged outside the extension rod. A driving motor is arranged outside the collar. A support rod is arranged on the back side of the slide rail. A connecting plate is arranged at the end of the support rod. Gears meshing with each other are arranged on the connecting plate and the output end of the driving motor.

[0012] In some embodiments, electromagnets are arranged on both sides of the connecting plate.

[0013] In some embodiments, flanges are arranged at the ends of the output rod and the extension rod where they are connected to each other, and the output rod and the extension rod are connected through the flanges.

[0014] In some embodiments, a threaded sleeve is fixedly arranged on the slider. One end of the tensioning rod is provided with a threaded column, and an installation notch is arranged at the other end of the tensioning rod.

[0015] In some embodiments, a first connection block is fixedly arranged at one end of the tension rod away from the threaded sleeve. An arc plate is connected to the side of the first connection block. A second connection block is fixedly connected to the side wall of the arc plate. The first connection block, the arc plate, and the second connection block form a mounting notch, and an opening for placing a steel wire is provided on the second connection block.

[0016] In some embodiments, a placement groove is formed in the first connection block. A support spring is arranged in the placement groove. A pressing block is slidably arranged at the notch of the placement groove. Two ends of the support spring are respectively connected to the bottom of the placement groove and the pressing block.

[0017] The present invention has at least the following beneficial effects: 1. The present application adopts a common pressure oil circuit system with a single cylinder body driving multiple output rods, forcing the oil pressure in all sliding cavities to be instantaneously equal, ensuring that the output forces of all output rods are exactly the same, eliminating the tensile force deviation caused by individual differences of steel wires, and avoiding under-tensioning or over-tensioning of a single steel wire; 2. The slider moves horizontally along the slide rail to adapt to the steel wire spacing, and the whole slide rail rotates to correct the steel wire angle. When the slider deflects to generate an overturning moment, the electromagnets on both sides of the connecting plate generate a reverse correction moment through the current difference, forcing the slide rail to return to horizontal, thereby offsetting the eccentric load stress caused by position adjustment and avoiding local wear of the slide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the partial structure; Figure 3 It is a schematic diagram of the structure at the tensioning oil cylinder of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the partial structure; Figure 5 It is a schematic diagram of the structure at the extension rod of the present invention; Figure 6 It is a schematic diagram of the structure of the connecting piece of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the structure in another orientation; Figure 8 It is a schematic diagram of the structure of the tension rod of the present invention; Figure 9 For the present invention Figure 8 Schematic diagram of the structure at A in; Figure 10 It is a schematic cross-sectional structure diagram of the first connection block of the present invention; Figure 11 It is a schematic cross-sectional structure diagram of the cylinder block of the present invention.

[0019] In the figure: 1 - pedestal; 2 - fixed crossbeam; 3 - mounting crossbeam; 4 - tensioning oil cylinder; 41 - cylinder body; 42 - sliding cavity; 43 - common oil inlet cavity; 44 - common oil outlet cavity; 5 - output rod; 6 - connecting piece; 61 - slide rail; 62 - slider; 63 - lead screw; 64 - drive motor; 65 - collar; 66 - drive motor; 67 - support rod; 68 - connecting plate; 69 - gear; 610 - electromagnet; 7 - tensioning rod; 8 - coupler anchor; 9 - extension rod; 10 - threaded sleeve; 11 - threaded column; 12 - mounting notch; 13 - first connecting block; 14 - arc plate; 15 - second connecting block; 16 - placement groove; 17 - support spring; 18 - pressing block. Detailed implementation mode

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0021] Embodiment 1: Please refer to Figures 1 - 3 , the present invention provides a technical solution: a prestressed tensioning device for reinforced concrete sleepers, including a pedestal 1. In actual use, for the convenience of adjustment, four-wheel moving trolleys can also be configured at the bottom of the pedestal 1 to cooperate with the track to achieve the overall displacement along the tensioning direction. The above contents are all prior arts and will not be elaborated here. A fixed crossbeam 2 and a mounting crossbeam 3 are arranged on the pedestal 1. Both the fixed crossbeam 2 and the mounting crossbeam 3 are formed into a frame structure by welding steel plates. The fixed crossbeam 2 is used to clamp one section of the steel wire so that it can only deform along the tensioning direction, and the mounting crossbeam 3 is used to install the corresponding tensioning structure; A tensioning oil cylinder 4 is arranged on the mounting crossbeam 3. The tensioning oil cylinder 4 is provided with a plurality of output rods 5, that is, a plurality of output rods 5 correspond to one cylinder body 41, so as to realize the function of one cylinder body 41 corresponding to multiple output ends. The purpose of setting this structure is to ensure that the tensile forces of multiple output ends are consistent, so as to be able to tension each steel wire to the same extent. In the existing production process of sleepers, the steel wires used, due to the individual differences of each steel wire and the differences in the storage environment, result in different initial states of each steel wire during tensioning. If directly tensioned according to the same tensioning distance, ultimately the prestresses of each steel wire will be uneven. The structure of one cylinder body 41 corresponding to multiple output ends adopted in this application can avoid this phenomenon. The tensile forces provided by each output end in the cylinder body 41 are equal during output, so the prestresses of each steel wire can be kept uniform during tensioning. A connecting piece 6 is arranged at the end of the output rod 5, and the output rod 5 is connected with a tensioning rod 7 through the connecting piece 6. The two ends of the prestressed steel wire respectively pass through the fixed crossbeam 2 and are connected with the tensioning rod 7.

[0022] During tensioning, the tensioning oil cylinder 4 is installed on the installation cross beam 3, and then each output end of the tensioning oil cylinder 4 is connected to the steel wire. One section of the steel wire at both ends of the mold can be fixed by existing anchor devices, and then tensioning can be carried out by providing a tensile force through the tensioning oil cylinder 4.

[0023] The tensioning oil cylinder 4 can be directly connected to the side wall of the installation cross beam 3, and the two can be directly connected by welding, so that the tensioning oil cylinder 4 is connected to the outside of the installation cross beam 3. In actual production, in order to save installation space, a groove can also be opened in the installation cross beam 3, so that the tensioning oil cylinder 4 can be installed inside the installation cross beam 3, and the cylinder body 41 of the tensioning oil cylinder 4 can be hidden inside the installation cross beam 3, which can save installation space.

[0024] Embodiment 2: Please refer to Figure 4 , the present invention provides a technical solution: a prestressed tensioning device for a reinforced concrete sleeper. Both ends of the prestressed steel wire are fixedly connected with a coupler anchor 8. The coupler anchor 8 is arranged at the end of the steel wire, which facilitates the connection between the end of the steel wire and the tension rod 7. Moreover, a wedge clamp is also installed outside the prestressed steel wire, and an anchor plate is arranged outside the wedge clamp. The structures of the wedge clamp and the anchor plate are both prior arts and are not shown in the figure. The purpose is to fix the section of the steel wire outside the mold. The wedge clamp is installed on the anchor plate, and the anchor plate is installed at both ends of the mold. During tensioning, the steel wire generates prestressed deformation along the tensioning direction, and the structure of the wedge clamp cooperating with the anchor plate can prevent the steel wire from moving in the reverse direction, ensuring the smooth progress of the tensioning process.

[0025] Embodiment 3: Please refer to Figure 11 , the present invention provides a technical solution: a prestressed tensioning device for a reinforced concrete sleeper. The tensioning oil cylinder 4 includes a cylinder body 41 and a plurality of output rods 5 arranged inside the cylinder body 41. A plurality of sliding cavities 42 for the output rods 5 to slide are opened in the cylinder body 41. A piston connected to the output rod 5 is slidably arranged in the sliding cavity 42. The piston separates the sliding cavity 42. A common oil inlet cavity 43 and a common oil outlet cavity 44 are respectively arranged on the front and rear sides of the cylinder body 41. The two sides of the sliding cavity 42 separated by the piston are respectively communicated with each other through the common oil inlet cavity 43 and the common oil outlet cavity 44.

[0026] A plurality of sliding chambers 42 are connected in parallel through a common oil inlet chamber 43 and a common oil outlet chamber 44 to form a common pressure oil circuit system. When high-pressure oil is injected into the common oil inlet chamber 43, the oil enters all the sliding chambers 42 simultaneously, pushing the output rods 5 to extend synchronously; during oil return, it flows back centrally through the common oil outlet chamber 44. The design of the common oil inlet chamber 43 and the common oil outlet chamber 44 makes the oil pressure in all the sliding chambers 42 equal instantaneously, forcing the output force of each output rod 5 to be consistent. Furthermore, during tensioning, each output rod 5 can be respectively connected to a steel wire, enabling the connection of steel wires with different initial states to the respective output rods 5. Since the tensile forces provided by the output rods 5 are the same, the tensile force deviation caused by wire differences can be offset, controlling the dispersion error of the prestress. This common pressure oil circuit system can also reduce the complexity of the pipeline and avoid uneven flow caused by differences in the lengths of the oil pipes.

[0027] Embodiment 4: Please refer to Figures 5 - 7 , the present invention provides a technical solution: a prestressed tensioning device for a reinforced concrete sleeper. An extension rod 9 is connected to the end of the output rod 5. The output rod 5 and the extension rod 9 are connected by a temporary means during use, which can be flange connection or snap connection. A connecting member 6 is arranged outside the extension rod 9. The connecting member 6 includes a slide rail 61 rotatably arranged at the end of the extension rod 9. A slider 62 is slidably arranged in the slide rail 61. One end of a tension rod 7 is connected to the slider 62. When the slider 62 moves, it can drive the tension rod 7 to move. A lead screw 63 with a thread passing through the slider 62 is rotatably arranged in the slide rail 61. The rotation of the lead screw 63 drives the slider 62 to move in the slide rail 61. In order to reduce the stress on the lead screw 63, side plates can be arranged on the side of the slider 62, and grooves for the movement of the side plates are correspondingly opened in the slide rail 61. In this way, when the slider 62 bears the tensile force, the side plates bear the main tensile force. A drive motor 64 is arranged outside the slide rail 61. Belt pulleys are arranged at the output end of the drive motor 64 and on the outside of the lead screw 63, and a belt is arranged on the outside of the belt pulleys. The drive motor 64 drives the rotation of the lead screw 63 through belt transmission. A driving member for driving the rotation of the slide rail 61 is also arranged outside the extension rod 9.

[0028] The driving member includes a collar 65 arranged outside the extension rod 9. A drive motor 66 is arranged outside the collar 65. A support rod 67 is arranged on the back side of the slide rail 61. A connecting plate 68 is arranged at the end of the support rod 67. Gears 69 that mesh with each other are arranged on the connecting plate 68 and at the output end of the drive motor 66. The position of the drive motor 66 relative to the extension rod 9 remains unchanged. The drive motor 66 drives the gears 69 to mesh with each other, thereby driving the rotation of the connecting plate 68. The connecting plate 68 drives the rotation of the slide rail 61 through the support rod 67.

[0029] Electromagnets 610 are arranged on both sides of the connecting plate 68. The slide rail 61 is made of a metal material that can be attracted by the electromagnets 610, and the rest of the structures are made of non-magnetic materials.

[0030] The above-mentioned slide rail 61 - slider 62 - electromagnet 610 cooperate to form an electromagnetic force balance system. This electromagnetic force balance system is designed specifically to solve the problem of wire position deviation caused by batch differences during sleeper tensioning. When the slider 62 moves along the slide rail 61 to adapt to the wire spacing of different sleepers, the original force balance will be disrupted, generating an overturning moment. That is, under normal conditions, the axes of the output rod 5, the extension rod 9, the slider 62, and the tension rod 7 coincide. In this way, when the output rod 5 provides tension, the tension is transmitted linearly along the above structure. However, when the position or spacing of the wires changes due to model differences of the sleepers, since the structure of the tensioning cylinder 4 remains unchanged at this time, the slide rail 61 needs to adjust its position, and the slider 62 adjusts its position within the slide rail 61 so that the tension rod 7 can coincide with the wire axis. At this time, the output rod 5 and the wire are no longer coaxial, and an additional moment will be generated during tensioning, which may cause deformation of the slide rail 61 and reduce its service life. Therefore, electromagnets 610 are symmetrically arranged on both sides of the connecting plate 68. By adjusting the current, such as increasing the current on the right side / decreasing the current on the left side when moving leftward, a reverse correction moment is generated to automatically restore the slide rail 61 to a horizontal state. This not only eliminates the offloading stress but also maintains the multi-directional adjustment ability of the system, significantly improving the adaptability of the equipment to the fluctuations in sleeper specifications during batch production. At the same time, it reduces the structural weight gain and maintenance burden brought by traditional mechanical balance solutions, achieving the dual optimization of dynamic stability and lightweight.

[0031] Embodiment 5: Please refer to Figures 8 - 10 , the present invention provides a technical solution: a prestressed tensioning device for reinforced concrete sleepers. Flanges are provided at the mutually connected ends of the output rod 5 and the extension rod 9, and the output rod 5 and the extension rod 9 are connected through the flanges to achieve lossless transmission of the tension force. The bolts are pre-tightened to form a bending and torsion-resistant composite structure, avoiding connection loosening caused by vibration and ensuring the reliability of the main force transmission path.

[0032] A threaded sleeve 10 is fixedly provided on the slider 62, and a threaded post 11 is provided at one end of the tension rod 7 to form a detachable rigid connection. This design supports the quick replacement or length fine-tuning of the tension rod 7 to adapt to the tensioning requirements of different diameter wires. At the same time, the self-locking characteristic of the thread prevents displacement deviation during the tensioning process, and an installation notch 12 is provided at the other end of the tension rod 7.

[0033] A first connection block 13 is fixedly provided at the end of the tension rod 7 far from the threaded sleeve 10. An arc plate 14 is connected to the side of the first connection block 13, and a second connection block 15 is fixedly connected to the side wall of the arc plate 14. The first connection block 13, the arc plate 14, and the second connection block 15 form the installation notch 12, and an opening for placing the wire is provided on the second connection block 15. When the tension rod 7 is connected to the wire, the upset anchor 8 at the end of the wire can be clamped into the installation notch 12, and then when tensioning, the second connection block 15 is stressed and drives the wire to be tensioned through the upset anchor 8.

[0034] A placement groove 16 is formed in the first connection block 13. A support spring 17 is arranged in the placement groove 16. A pressing block 18 is slidably arranged at the notch of the placement groove 16. Two ends of the support spring 17 are respectively connected with the bottom of the placement groove 16 and the pressing block 18. Before tensioning after the pier head anchor 8 is installed into the installation notch 12, the support spring 17 pushes the pressing block 18 to abut against the pier head anchor 8, forming an initial clamping force to prevent it from coming out.

[0035] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0036] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention.

Claims

1. A prestressed tensioning device for a reinforced concrete sleeper, comprising a pedestal (1), wherein a fixed cross beam (2) and an installation cross beam (3) are arranged on the pedestal (1), and the characteristics are as follows: A tensioning oil cylinder (4) is arranged on the installation cross beam (3). The tensioning oil cylinder (4) is provided with a plurality of output rods (5). A connecting piece (6) is arranged at the end of the output rod (5). The output rod (5) is connected with a tensioning rod (7) through the connecting piece (6). Both ends of the prestressed steel wire pass through the fixed cross beam (2) respectively and are connected with the tensioning rod (7).

2. The prestressing tensioning device for reinforced concrete sleepers according to claim 1, characterized in that: Both ends of the prestressed steel wire are fixedly connected with a pier head anchor (8), and a wedge-shaped clamp is further installed on the outer side of the prestressed steel wire. An anchor plate is arranged on the outer side of the wedge-shaped clamp.

3. The prestressing tensioning device for reinforced concrete sleepers according to claim 1, characterized in that: The tensioning oil cylinder (4) comprises a cylinder body (41) and a plurality of output rods (5) arranged in the cylinder body (41). A plurality of sliding cavities (42) for the output rods (5) to slide are formed in the cylinder body (41). A common oil inlet cavity (43) and a common oil outlet cavity (44) are respectively arranged on the front and rear sides of the cylinder body (41). The plurality of sliding cavities (42) are communicated with each other through the common oil inlet cavity (43) and the common oil outlet cavity (44).

4. The prestressed tensioning device for reinforced concrete sleepers according to claim 1, wherein: An extension rod (9) is connected to the end of the output rod (5). The connecting piece (6) is arranged on the outer side of the extension rod (9). The connecting piece (6) comprises a slide rail (61) rotatably arranged at the end of the extension rod (9). A slider (62) is slidably arranged in the slide rail (61). One end of the tensioning rod (7) is connected with the slider (62). A lead screw (63) with a thread passing through the slider (62) is rotatably arranged in the slide rail (61). A driving motor (64) is arranged on the outer side of the slide rail (61). Belt wheels are arranged on the output end of the driving motor (64) and the outer side of the lead screw (63). A belt is arranged on the outer side of the belt wheel. The driving motor (64) drives the lead screw (63) to rotate through belt transmission. A driving part for driving the slide rail (61) to rotate is further arranged on the outer side of the extension rod (9).

5. The prestressing tensioning device for reinforced concrete sleepers according to claim 4, characterized in that: The driving part comprises a collar (65) arranged on the outer side of the extension rod (9). A driving motor (66) is arranged on the outer side of the collar (65). A support rod (67) is arranged on the back side of the slide rail (61). A connecting plate (68) is arranged at the end of the support rod (67). Gears (69) which are meshed with each other are arranged on the connecting plate (68) and the output end of the driving motor (66).

6. The prestressed tensioning device for reinforced concrete sleepers according to claim 5, characterized in that: Electromagnets (610) are arranged on both sides of the connecting plate (68).

7. The prestressing tensioning device for reinforced concrete sleepers according to claim 4, wherein: Flanges are arranged at the ends of the output rod (5) and the extension rod (9) which are connected with each other, and the output rod (5) and the extension rod (9) are connected through the flanges.

8. The prestressed tensioning device for reinforced concrete sleepers according to claim 4, characterized in that: A threaded sleeve (10) is fixedly arranged on the slider (62). A threaded column (11) is arranged at one end of the tensioning rod (7), and an installation notch (12) is arranged at the other end of the tensioning rod (7).

9. The prestressing tensioning device for reinforced concrete sleepers according to claim 8, characterized in that: A first connecting block (13) is fixedly arranged at the end of the tensioning rod (7) far away from the threaded sleeve (10). An arc plate (14) is connected to the side of the first connecting block (13). A second connecting block (15) is fixedly connected to the side wall of the arc plate (14). The first connecting block (13), the arc plate (14) and the second connecting block (15) form the installation notch (12), and an opening for placing the steel wire is arranged on the second connecting block (15).

10. The prestressing tensioning device for reinforced concrete sleepers according to claim 9, characterized in that: A placement groove (16) is formed in the first connection block (13), a support spring (17) is arranged in the placement groove (16), a pressing block (18) is slidably arranged at the notch of the placement groove (16), and two ends of the support spring (17) are respectively connected to the bottom of the placement groove (16) and the pressing block (18).

Images