Assembly type low t-beam prestressed steel strand tensioning protection device

Abstract

The present application relates to prestressed steel strand tensioning protection technical field, provide a kind of assembled low T beam prestressed steel strand tensioning protection device, including tensioning unit, including fixed assembly and moving assembly, fixed assembly one end is arranged on T beam body, and with steel beam channel communication, fixed assembly other end sets moving assembly, fixed assembly and moving assembly slidingly connected, moving assembly is used to clamp and tension steel beam;Protection assembly, including fixed block, fixed block is set in fixed assembly far from T beam body one end by fixed column, movable setting protection disc on the side of fixed block close to fixed assembly, protection disc is connected clamping assembly by transmission assembly, clamping assembly is used to clamp and fix after steel beam breaks, prevent steel beam from being ejected and dangerous.The present application can prevent the broken steel beam from ejecting to cause harm to workers after steel beam stretching breaks, improve the safety of construction.

Description

Technical Field

[0001] This invention relates to the field of prestressed steel strand tension protection technology, specifically to a prefabricated prestressed steel strand tension protection device for low T-beams. Background Technology

[0002] When prefabricated low-profile T-beams used in highway construction are put into service, the steel strands inside the low-profile T-beams are prestressed. By applying a pre-tension force, a certain compressive stress is generated in the low-profile T-beams under load, which can improve the load-bearing capacity of the low-profile T-beams. At the same time, the concrete of low-profile T-beams is prone to cracking under tensile stress. Through prestressing, the concrete can resist tension under external loads, reducing or controlling the occurrence and development of cracks. Prestress can delay or prevent crack propagation, improve the durability and service life of the low-profile T-beams, and also improve the performance of concrete, making the low-profile T-beams more stable during operation. Therefore, when prefabricated low-profile T-beams used in highway construction are put into service, the steel strands inside the low-profile T-beams are prestressed.

[0003] However, when the steel strand is stretched by a certain force, it may break. This is because the internal stress gradually increases during stretching, and it will break when it reaches its ultimate strength. At the moment of breakage, the energy inside the steel strand is suddenly released, generating a large amount of kinetic energy, which causes the fragments of the object to move outward rapidly through inertia, forming an ejection phenomenon. Therefore, if the steel strand breaks while workers are working near it, the ejected fragments may accidentally injure the workers, posing a certain danger to them.

[0004] Therefore, in order to address the above problems, a prefabricated prestressed steel strand tensioning protection device for short T-beams is proposed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention develops a prefabricated prestressed steel strand tensioning protection device for short T-beams. This invention can prevent the broken steel strands from popping out and causing injury to workers after the steel strands break during tensioning, thereby improving construction safety.

[0006] To achieve the above objectives, the present invention employs the following technical solution: A prefabricated prestressed steel strand tensioning protection device for a short T-beam is installed on the T-beam body, with steel strand channels provided on the T-beam body for installing the steel strands. The device includes: The tensioning unit includes a fixed component and a movable component. One end of the fixed component is set on the T-beam body and communicates with the steel strand channel. The other end of the fixed component is set with the movable component. The fixed component and the movable component are slidably connected. The movable component can move to the end away from the fixed component. The movable component is used to clamp and tension the steel strand. The protective component includes a fixing block, which is set at the end of the fixing component away from the T-beam body via a fixing post. A protective disc is movably mounted on the side of the fixing block near the fixing component. The protective disc is connected to a clamping component via a transmission component. The clamping component is used to clamp and fix the steel strand after it breaks, preventing the steel strand from being ejected and causing danger.

[0007] Preferably, the fixing component includes a housing with a hollow cavity inside. A sealed conduit is fitted inside the housing, and the sealed conduit is hollow inside. An air chamber is formed between the outer wall of the sealed conduit and the inner wall of the housing. One end of the moving component is slidably disposed in the air chamber. A steel strand guide plate is provided at one end of the housing, and several fixing columns are connected to the end of the housing away from the steel strand guide plate, which improves the stability of the device during use.

[0008] Preferably, the moving component includes an inner shell and a clamping plate. One end of the inner shell is slidably disposed in the air chamber and divides the air chamber into a front air chamber and a rear air chamber that are not interconnected. The other end of the inner shell is provided with a clamping plate for pre-clamping the steel strand to stretch the steel strand, thereby improving the practicality of the device.

[0009] Preferably, a first air pipe and a second air pipe are provided at both ends of the outer side of the outer casing. The first air pipe is connected to the front air chamber, and the second air pipe is connected to the rear air chamber. Air is supplied to the front or rear air chamber to drive the moving component to move, thereby improving the efficiency of the device.

[0010] Preferably, the clamping assembly includes a fixed plate and a rotating gear. The fixed plate is mounted on a fixed post on the side of the clamping plate away from the fixed assembly, and the rotating gear is mounted on the side of the fixed plate away from the clamping plate. An arc-shaped guide groove is provided on the fixed plate, and a limiting rod is provided on the rotating gear. The limiting rod is slidably connected to the guide groove, and the center of the arc of the guide groove coincides with the axis of the rotating gear, which improves the safety of the device.

[0011] Preferably, the surfaces of the steel strand guide plate, clamping plate, and fixing plate are parallel to each other, and each of the steel strand guide plate, clamping plate, and fixing plate has several through holes for the steel strand to pass through. The number and position of the through holes on the steel strand guide plate, clamping plate, and fixing plate correspond one-to-one. The rotating gear has several clamping holes, and the number and position of the clamping holes correspond one-to-one with the number and position of the through holes on the fixing plate. When the device is working normally, the positions of the clamping holes and the through holes on the fixing plate coincide, which facilitates the movement of the steel strand and improves the practicality of the device.

[0012] Preferably, the protective disc is spring-loaded onto the side of the fixed block closest to the fixed disc, which improves the practicality of the device.

[0013] Preferably, the transmission assembly includes a first gear, a rotating shaft, a second gear, a push rod, and a rack. The rotating shaft is positioned between a fixed block and a fixed disc. The first gear and the second gear are respectively positioned at both ends of the rotating shaft and are coaxial with the rotating shaft. The first gear meshes with the rotating gear, and the second gear meshes with and connects to the rack. The rack is slidably mounted on the fixed block. The two ends of the push rod are respectively connected to the protective disc and the rack. The movement of the rotating gear toward the fixed block can push the rack to move, thereby improving the stability of the device.

[0014] As a preferred option, multiple transmission components are provided, connecting rotating gears, fixed blocks, and protective discs, which improves the safety of the device.

[0015] Preferably, the area of ​​the fixing block is greater than or equal to the area of ​​the fixing plate, and the area of ​​the protective plate is greater than or equal to the area of ​​the range of the clamping holes opened on the rotating gear, which improves the safety and practicality of the device.

[0016] The effects described in the invention are merely those of the embodiments, and not all the effects of the invention. The above technical solution has the following advantages: 1. This invention uses a rotating gear. After the rotating gear rotates, the clamping hole and the steel strand through hole on the fixing plate change from a completely overlapping state to a partially overlapping state. This reduces the overlapping part between the clamping hole and the steel strand through hole on the fixing plate, thereby achieving the purpose of clamping the steel strand. This allows the broken steel strand to be clamped and fixed at the moment of ejection, avoiding the possibility that the broken steel strand might accidentally injure the workers if it breaks, thus improving the safety during construction. 2. The rotational force of the rotating gear in this invention is determined by the force acting on the limiting plate after the broken steel beam is ejected. Therefore, the greater the force of the broken steel beam ejected, the greater the force acting on the protective plate, making the rotating gear clamp the steel beam more tightly and the protection more secure. At the same time, when the steel beam breaks, the protective plate can shield the ejected steel beam, and the fixing block can also provide partial shielding, avoiding accidental injury to workers after some steel beams break without shielding, further ensuring the safety of workers. 3. This invention, by setting up a tensioning unit, allows the inner shell to move away from the T-beam body during tensioning, thereby driving the clamping plate to move and tensioning the steel strands inside the T-beam body. When the steel strands do not meet the tensioning requirements and need to be tensioned again, the pressurization of the first air pipe is canceled to release the air, and then the second air pipe is pressurized to make the inner shell drive the clamping plate to move back to the initial position for re-tensioning. This achieves tensioning of the steel strands inside the T-beam body, improves the load-bearing capacity and crack resistance of the concrete component, gives the component a greater load-bearing capacity, reduces the deflection of the component, and improves the stability of construction. 4. By setting a spring between the protective disc and the fixed block, the broken steel strand is blocked by the protective disc. The broken steel strand ejected from the disc pushes the protective disc toward the fixed block. After the protective disc moves, it can release some of the force of the ejected broken steel strand due to the compression of the spring, thereby reducing the kinetic energy of the steel strand ejected from the disc and providing secondary protection for the surrounding working environment, thus improving the practicality of the device. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0018] Figure 1 This is an installation diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the overall half-section structure of an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the protective component and the transmission component according to an embodiment of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the structure of the protective component and the transmission component according to an embodiment of the present invention. Figure 2 ; Figure 6 This is a schematic diagram showing the position of the rotating gear in an embodiment of the present invention; Figure 7 This is an exploded view of the rotating gear and the fixed disk according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the connection of the transmission component according to an embodiment of the present invention.

[0019] In the diagram, 1. T-beam body; 2. Outer shell; 3. Steel strand channel; 4. Steel strand guide plate; 5. First air pipe; 6. Second air pipe; 7. Inner shell; 8. Clamping plate; 9. Fixing column; 10. Fixing plate; 11. Steel strand through hole; 12. First gear; 13. Rotating gear; 14. Clamping hole; 15. Guide groove; 16. Fixing block; 17. Rotating shaft; 18. Second gear; 19. Protective plate; 20. Spring; 21. Push rod; 22. Rack; 23. Sealing conduit. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1-8 As shown, the present invention provides a technical solution: A prefabricated prestressed steel strand tensioning protection device for a short T-beam is installed on the T-beam body 1. A steel strand channel 3 is provided on the T-beam body 1 for installing and inserting steel strands. The device includes: a tensioning unit comprising a fixed component and a movable component. One end of the fixed component is mounted on the T-beam body 1 and communicates with the steel strand channel 3. The other end of the fixed component is provided with the movable component, and the fixed component and the movable component are slidably connected. The movable component can move away from the fixed component and is used to clamp and tension the steel strands. A protection component includes a fixed block 16, which is mounted on the fixed component at the end away from the T-beam body 1 via a fixed post 9. A protective disc 19 is movably mounted on the side of the fixed block 16 near the fixed component. The protective disc 19 is connected to a clamping component via a transmission component. The clamping component is used to clamp and fix the steel strand after it breaks, preventing the steel strand from ejecting and causing danger.

[0022] In this embodiment, the fixing component includes a housing 2, the interior of which is configured as a hollow cavity. A sealing conduit 23 is fitted inside the housing 2, the interior of which is also a hollow cavity. An air chamber is formed between the outer wall of the sealing conduit 23 and the inner wall of the housing 2. One end of the moving component is slidably disposed within the air chamber. A steel strand guide plate 4 is disposed in the middle of one end of the housing 2. Several fixing posts 9 are connected to the end of the housing 2 away from the steel strand guide plate 4. The protective component is connected through the fixing posts 9, which improves the stability of the device.

[0023] In this embodiment, the moving component includes an inner shell 7 and a clamping plate 8. One end of the inner shell 7 is slidably disposed in the air chamber and divides the air chamber into a front air chamber and a rear air chamber that are not connected to each other. The clamping plate 8 is disposed in the middle of the other end of the inner shell 7 for pre-clamping the steel strand. The inner shell 7 is moved by pushing it through the front air chamber and the rear air chamber, thereby driving the clamping plate 8 to move, which improves the practicality of the device.

[0024] In this embodiment, a first air pipe 5 and a second air pipe 6 are provided at both ends of the outer side of the outer shell 2. The first air pipe 5 is connected to the front air chamber, and the second air pipe 6 is connected to the rear air chamber. The ends of the first air pipe 5 and the second air pipe 6 away from the outer shell 2 are both connected to an air pump. Air is sequentially introduced and released into the front air chamber and the rear air chamber through the first air pipe 5 and the second air pipe 6, which is used to drive the inner shell 7 of the moving component to move away from or closer to the T-beam body, thereby improving the efficiency of the device.

[0025] In this embodiment, the clamping assembly includes a fixed disk 10 and a rotating gear 13. The fixed disk 10 is mounted on a fixed post 9 on the side of the clamping disk 8 away from the fixed assembly. The rotating gear 13 is mounted on the side of the fixed disk 10 away from the clamping disk 8. The rotating gear 13 can be an incomplete gear. Four arc-shaped guide grooves 15 are evenly provided on the fixed disk 10. A limiting rod is provided on the rotating gear 13. The limiting rod is slidably connected to the guide groove 15. The arc center of the guide groove 15 coincides with the axis of the rotating gear 13 to facilitate the rotation of the rotating gear 13 and improve the stability of the device.

[0026] In this embodiment, the surfaces of the steel strand guide plate 4, clamping plate 8, and fixing plate 10 are parallel to each other, and each of the steel strand guide plate 4, clamping plate 8, and fixing plate 10 has a plurality of steel strand through holes 11 for passing through the steel strand. The number and position of the steel strand through holes 11 on the steel strand guide plate 4, clamping plate 8, and fixing plate 10 correspond one-to-one. The rotating gear 13 has a plurality of clamping holes 14, and the number and position of the clamping holes 14 correspond one-to-one with the number and position of the steel strand through holes 11 on the fixing plate 10. When the device is working normally, the positions of the clamping holes 14 and the steel strand through holes 11 on the fixing plate 10 coincide, so as to facilitate the sliding of the steel strand in the steel strand through holes 11 and clamping holes 14, thereby improving the practicality of the device.

[0027] In another embodiment, a clamping piece for pre-clamping the steel strand is provided in the steel strand through hole 11 of the clamping plate 8. The clamping piece is conical, and the tip of the conical clamping piece faces the T-beam body 1 to clamp the steel strand more firmly and improve the stability of the device during tensioning.

[0028] In this embodiment, the protective disc 19 is set on the side of the fixed block 16 near the fixed disc 10 by the spring 20. The spring 20 can dissipate part of the force of the ejected broken steel bundle, reduce the kinetic energy of the steel bundle when it is ejected, and provide secondary protection for the surrounding working environment, thus improving the practicality of the device.

[0029] In this embodiment, the transmission assembly includes a first gear 12, a rotating shaft 17, a second gear 18, a push rod 21, and a rack 22. The rotating shaft 17 is movably disposed between the fixed block 16 and the fixed disk 10. The first gear 12 and the second gear 18 are respectively disposed at both ends of the rotating shaft 17 and are both coaxially disposed with the rotating shaft 17. The first gear 12 meshes with the rotating gear 13, and the second gear 18 meshes with and connects to the rack 22. The rack 22 is slidably disposed on the fixed block 16. The two ends of the push rod 21 are movably connected to the protective disk 19 and the rack 22, respectively. The rotating gear 13 moves towards the fixed block 16. Directional movement can drive rack 22 to move, causing second gear 18 to rotate, thereby causing shaft 17 to rotate. Shaft 17 drives first gear 12 to rotate, and first gear 12 drives rotating gear 13 to slide along the trajectory of guide groove 15 to rotate. After rotating gear 13 rotates, the clamping hole 14 and the steel strand through hole 11 on the fixed plate 10 change from complete overlap to partial overlap, reducing the overlap between clamping hole 14 and steel strand through hole 11 on the fixed plate 10, thereby achieving the purpose of clamping steel strand and improving the practicality and safety of the device.

[0030] In this embodiment, four sets of transmission components are evenly distributed between the fixed block 16 and the fixed disk 10 to stably connect the rotating gear 13, the fixed block 16 and the protective disk 19, thereby improving the stability of the device.

[0031] In this embodiment, the area of ​​the fixing block 16 is greater than or equal to the area of ​​the fixing disk 10, and the area of ​​the protective disk 19 is greater than or equal to the area of ​​the range of the clamping holes 14 opened on the rotating gear 13, so as to prevent the steel strand from breaking and not bouncing onto the protective disk 19, thus improving the practicality of the device.

[0032] In another embodiment, the fixing block 16 can be made of a sound-producing material, which can generate vibration and produce sound when the rack 22 slides. When the device is working, when the rack 22 slides and generates vibration and produces sound, the personnel working can immediately know that the steel strand has broken and can evacuate immediately, thus improving the safety of the device.

[0033] Working principle: First, the fixing component of the tensioning unit of this invention is set on the T-beam body 1 and connected to the steel strand channel 3. The steel strands extending from the steel strand channel 3 pass sequentially through the steel strand through-hole on the steel strand guide plate 4, the cavity of the sealing conduit 23, and the steel strand through-hole on the clamping plate 8. The steel strands are pre-clamped by the clamping plate 8. Then, by pressurizing the first air pipe 5, the inner shell 7 moves away from the T-beam body 1. The inner shell 7 drives the clamping plate 8 to move, and the clamping plate 8 tensions the steel strands. When the steel strands do not reach the tension requirement and need to be tensioned again, the pressurization of the first air pipe 5 is stopped and the air is released. At the same time, the second air pipe 6 is pressurized, causing the inner shell 7 to move away from the T-beam body 1. The moving clamping disc 8 returns to its initial position for re-tensioning, thereby improving the load-bearing capacity and crack resistance of the concrete component while tensioning the steel strand within the T-beam body. This allows it to withstand greater loads, reduce component deflection, and enhance overall strength and stability. The steel strand passing through the clamping disc 8 then passes sequentially through the steel strand through-hole on the fixed disc 10 and the clamping hole 14 on the rotating gear 13. If a break occurs during the tensioning process, the broken steel strand is ejected. The broken steel strand is blocked by the protective disc 19, which pushes the protective disc 19 towards the fixed block 16. After the protective disc 19 moves, the compression spring 20 can release some of the force from the ejected broken steel strand. This reduces the kinetic energy of the ejected steel strand, providing secondary protection for the surrounding working environment. Simultaneously, the movement of the protective disc 19 drives the push rod 21, causing the rack 22 to slide outwards from the fixed block 16. The rack 22 then drives the second gear 18 to rotate. The second gear 18, through the rotating shaft 17, drives the first gear 12 to rotate. The first gear 12 then drives the rotating gear 13 to slide and rotate along the trajectory of the guide groove 15. After the rotating gear 13 rotates, the clamping hole 14 and the steel strand through hole 11 on the fixed disc 10 change from complete overlap to partial overlap, reducing the overlap between the clamping hole 14 and the steel strand through hole 11 on the fixed disc 10. This achieves the purpose of clamping the steel strand, preventing breakage. The steel strand can be clamped and fixed at the moment of ejection, preventing it from being ejected and accidentally injuring personnel. At the same time, since the rotation force of the rotating gear 13 is determined by the force exerted on the protective plate 19 by the broken steel strand, the greater the force of the broken steel strand ejection, the greater the force exerted on the protective plate 19, making the rotating gear 13 clamp the steel strand more tightly, and the protection more secure. In addition, when the steel strand breaks, the area of ​​the protective plate 19 can completely cover the ejected steel strand, and the fixing block 16 can also partially cover it, preventing the steel strand from breaking off and accidentally injuring personnel, further ensuring that the steel strand will not injure personnel and guaranteeing their safety.

[0034] All aspects not detailed in this invention are conventional technical means known to those skilled in the art.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0038] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A prefabricated prestressed steel strand tensioning protection device for a short T-beam, which is installed on the T-beam body (1), and a steel strand channel (3) is opened on the T-beam body (1), characterized in that, include: The tensioning unit includes a fixed component and a movable component. One end of the fixed component is set on the T-beam body (1) and connected to the steel strand channel (3). The other end of the fixed component is set with a movable component. The fixed component and the movable component are slidably connected. The movable component is used to clamp and tension the steel strand. The fixed component includes a shell (2). The inside of the shell (2) is set as a hollow cavity. A sealing conduit (23) is sleeved inside the shell (2). The inside of the sealing conduit (23) is hollow. An air chamber is formed between the outer wall of the sealing conduit (23) and the inner wall of the shell (2). One end of the movable component is slidably set in the air chamber. A steel strand guide plate (4) is set at one end of the shell (2). Several fixed columns (9) are connected to the end of the shell (2) away from the steel strand guide plate (4). The protective assembly includes a fixing block (16), which is mounted on the end of the fixing assembly away from the T-beam body (1) via a fixing post (9). A protective disc (19) is movably mounted on the side of the fixing block (16) near the fixing assembly. The protective disc (19) is connected to a clamping assembly via a transmission assembly. The clamping assembly is used to clamp and fix the steel strand after it breaks. The moving assembly includes an inner shell (7) and a clamping disc (8). One end of the inner shell (7) is slidably mounted in the air chamber and divides the air chamber into a front air chamber and a rear air chamber that are not connected to each other. The other end of the inner shell (7) is provided with a clamping disc (8) for pre-clamping the steel strand. The clamping assembly includes a fixing disc (10) and a rotating gear (13). The fixing disc (10) is mounted on the fixing post (9) on the side of the clamping disc (8) away from the fixing assembly. The rotating gear (13) is mounted on the side of the fixing disc (10) away from the clamping disc (8). On one side, an arc-shaped guide groove (15) is opened on the fixed plate (10), and a limiting rod is set on the rotating gear (13). The limiting rod is slidably connected to the guide groove (15), and the center of the arc of the guide groove (15) coincides with the axis of the rotating gear (13). The transmission assembly includes a first gear (12), a rotating shaft (17), a second gear (18), a push rod (21), and a rack (22). The rotating shaft (17) is set between the fixed block (16) and the fixed plate (10). The first gear (12) and the second gear (18) are respectively set at both ends of the rotating shaft (17) and are both coaxial with the rotating shaft (17). The first gear (12) meshes with the rotating gear (13), and the second gear (18) meshes with the rack (22). The rack (22) is slidably set on the fixed block (16). The two ends of the push rod (21) are respectively connected to the protective plate (19) and the rack (22). The broken steel strand is blocked by the protective disc (19). The broken steel strand ejected from the disc pushes the protective disc (19) towards the fixed block (16). After the protective disc (19) moves, it drives the push rod (21) to make the rack (22) slide out to the outside of the fixed block (16). Then the rack (22) drives the second gear (18) to rotate. The second gear (18) drives the first gear (12) to rotate through the shaft (17). The first gear (12) drives the rotating gear (13) to slide and rotate along the trajectory of the guide groove (15). After the rotating gear (13) rotates, the clamping hole (14) and the steel strand through hole (11) on the fixed disc (10) change from complete overlap to partial overlap, reducing the overlap between the clamping hole (14) and the steel strand through hole (11) on the fixed disc (10), thereby achieving the purpose of clamping the steel strand and enabling the broken steel strand to be clamped and fixed at the moment of ejection.

2. The prefabricated short T-beam prestressed steel strand tensioning protection device according to claim 1, characterized in that: The outer shell (2) has a first air pipe (5) and a second air pipe (6) at both ends on the outside. The first air pipe (5) is connected to the front air chamber and the second air pipe (6) is connected to the rear air chamber. Air is supplied to the front air chamber or the rear air chamber to drive the moving component to move.

3. The prefabricated prestressed steel strand tensioning protection device for precast T-beams according to claim 1, characterized in that: The surfaces of the steel strand guide plate (4), clamping plate (8) and fixing plate (10) are parallel to each other, and several steel strand through holes (11) for passing through the steel strand are opened on the steel strand guide plate (4), clamping plate (8) and fixing plate (10). The number and position of the steel strand through holes (11) on the steel strand guide plate (4), clamping plate (8) and fixing plate (10) correspond one-to-one. Several clamping holes (14) are opened on the rotating gear (13). The number and position of the clamping holes (14) correspond one-to-one with the number and position of the steel strand through holes (11) on the fixing plate (10).

4. The prefabricated prestressed steel strand tensioning protection device for a short T-beam according to claim 3, characterized in that: The protective plate (19) is mounted on the side of the fixed block (16) near the fixed plate (10) by a spring (20).

5. The prefabricated prestressed steel strand tensioning protection device for precast T-beams according to claim 1, characterized in that: Multiple transmission components are provided, connecting the rotating gear (13), the fixed block (16), and the protective disc (19).

6. The prefabricated prestressed steel strand tensioning protection device for short T-beams according to claim 5, characterized in that: The area of ​​the fixing block (16) is greater than or equal to the area of ​​the fixing plate (10), and the area of ​​the protective plate (19) is greater than or equal to the area of ​​the range of the clamping holes (14) opened on the rotating gear (13).

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