A tensioning device for a pre-tensioned beam

Abstract

The utility model relates to a kind of tensioning device of pre-tensioned beam, including anchoring end crossbeam, tensioning end crossbeam and pedestal force transmission pressure column, guide ring is equipped on tensioning end crossbeam, guide ring is equipped on guide sleeve, first fixed plate is equipped on guide sleeve, second fixed plate is equipped on first fixed plate, several first hydraulic cylinders are equipped on second fixed plate and first fixed plate, several steel strand fixing devices are equipped on anchoring end crossbeam, steel strand is correspondingly equipped on each steel strand fixing device, line pole connector is correspondingly equipped on each steel strand, fine rolled thread steel is correspondingly equipped on each line pole connector, the several fine rolled thread steels of first fixed plate side are equipped with first nut respectively, the several fine rolled thread steels of second fixed plate side are equipped with second nut respectively, pressure sensor is equipped between first fixed plate and guide ring. It can be easily adjusted to the initial tensioning degree of several steel strands within range. The utility model is convenient to use, with wide market prospect.

Description

Technical Field

[0001] This utility model relates to the field of tensioning equipment for pre-tensioned beams, and more specifically to a tensioning device for pre-tensioned beams. Background Technology

[0002] In the construction of high-efficiency prestressed concrete components, the tensioning of prestressing tendons is divided into two methods: pre-tensioning and post-tensioning. Pre-tensioned prestressed concrete components are a traditional product of precast component plants. In recent years, in the construction of beams and slabs for bridges and high-pile wharves in ports, as well as large-span prestressed slabs for industrial and civil buildings, long-line precast plants often use the pre-tensioning method to produce prestressed concrete components. The prestressing tendons are mostly high-strength, low-relaxation steel strands, and the concrete strength is generally above C40. There have also been many changes and improvements in the equipment and anchorages used for tensioning and releasing the prestressing tendons. The tensioning and anchoring of prestressed steel strands in the precast plant can be divided into two processes depending on the facilities: tensioning and anchoring of a single steel strand; and overall tensioning and anchoring of all steel strands.

[0003] The overall tensioning and anchoring of prestressed steel strands involves the entire prestressed steel strands being tensioned and anchored, often using a four-beam or three-beam jacking system. In practice, each steel strand is first given initial stress using a pre-installed internal clamp or through-type jack and then anchored to the tension frame beam or anchoring beam. Then, all prestressing tendons are tensioned using tensioning jacks and secured with bolts and nuts. Specifically, the anchoring end and tensioning end beams and pressure columns are connected together. Each steel strand is anchored by a working anchor and connected to the tensioning bolt via a connector. The tensioning bolt is anchored to the tensioning end beam and tensioning beam by nuts. The tensioning jack is installed between the tensioning end beam and tensioning beam. Once the prestressing tendons are anchored to the initial stress, all prestressing tendons can be tensioned using the tensioning jacks. According to the requirements of the tensioning process, the prestressed steel strands are tensioned and then anchored to the tensioning end beam. Once the tension stress reaches the preset range, each tensioning rod can be anchored to the tensioning end beam using nuts.

[0004] According to construction requirements, the tension of each individual steel strand after overall tensioning should be maintained within a suitable range. Although overall tensioning saves time and labor, it requires individual tensioning of each strand before overall tensioning to ensure that their initial stresses are all within a preset range. Therefore, there is room for improvement in the existing technology, aiming to make it easier for each strand to reach a preset initial stress range, thereby facilitating subsequent overall tensioning. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides a tensioning device for pre-tensioned beams that allows for easy adjustment of the initial tension of several steel strands to a range for further overall tensioning, thereby overcoming the deficiencies in existing technologies.

[0006] The technical solution adopted in this utility model is as follows: a tensioning device for a pre-tensioned beam, comprising an anchoring end crossbeam and a tensioning end crossbeam, wherein a platform force transmission column is provided between the anchoring end crossbeam and the tensioning end crossbeam, a guide ring is provided on the side of the tensioning end crossbeam away from the anchoring end crossbeam, a guide sleeve is provided on the guide ring, a first fixing plate is provided on the end of the guide sleeve away from the tensioning end crossbeam, a second fixing plate is provided on the side of the first fixing plate away from the guide sleeve, a plurality of first hydraulic cylinders are provided on the second fixing plate and the first fixing plate, and a plurality of steel cylinders are provided on the end of the anchoring end crossbeam away from the tensioning end crossbeam. The strand fixing device has one end of a steel strand corresponding to each strand, and the other end of each strand has one end of a pole connector. The other end of each pole connector has a precision-rolled threaded steel bar. Several precision-rolled threaded steel bars are installed on a first fixing plate and a second fixing plate. Several precision-rolled threaded steel bars on the side of the first fixing plate away from the anchor end beam are each provided with a first nut, and several precision-rolled threaded steel bars on the side of the second fixing plate away from the first fixing plate are each provided with a second nut. A pressure sensor is installed between the first fixing plate and the guide ring.

[0007] Preferably, each of the steel strand fixing devices includes a single-hole anchor on the corresponding steel strand and a first tool clamping plate group on the corresponding steel strand and the single-hole anchor; each of the pole connectors includes a first connecting sleeve on the corresponding steel strand, a second tool clamping plate group on the corresponding steel strand and the first connecting sleeve, one end of a first screw on the first connecting sleeve, the other end of the first screw, and a second connecting sleeve on the corresponding precision rolled threaded steel.

[0008] Preferably, the inner cavity of the first connecting sleeve includes a first threaded connecting cavity and a clamping guide cavity in sequence along the direction from near the second connecting sleeve to away from the second connecting sleeve. The clamping guide cavity adopts a frustum-shaped structure, and the diameter of the inner cavity of the clamping guide cavity gradually decreases along the direction from near the second connecting sleeve to away from the second connecting sleeve. The second tool clamping plate group is installed in the clamping guide cavity.

[0009] Preferably, the guide ring adopts a ring structure, and the guide sleeve adopts a ring structure that can slide along the extension direction of the inner cavity of the guide ring. The central axis of the guide sleeve and the central axis of the guide ring are located on the same axis. The number of pressure sensors is several, and the several pressure sensors are evenly distributed in a star shape on the guide ring and the first fixed plate outside the central axis of the guide ring.

[0010] Preferably, both the first fixing plate and the second fixing plate are respectively provided with a nut tightening mechanism. The nut tightening mechanism includes a second screw on the first fixing plate or the second fixing plate, a first pressure plate on the second screw, a guide tube on each fine-rolled threaded steel bar and the first pressure plate, a nut clamping ring on one end of each guide tube near the first fixing plate, a spring on the corresponding guide tube between each nut clamping ring and the first pressure plate, a second pressure plate on several nut clamping rings, and a second hydraulic cylinder on the second pressure plate and the first pressure plate.

[0011] Preferably, the nut tightening mechanism further includes a third nut respectively provided on the second screws on both sides of the first pressure plate; the number of the second screws and the number of the second hydraulic cylinders of the nut tightening mechanism are both several, and the several second screws and the several second hydraulic cylinders of the nut tightening mechanism are evenly distributed in a star shape on the outside of the central axis of the first pressure plate, and the central axis of the first pressure plate and the central axis of the second pressure plate are located on the same axis.

[0012] Preferably, the nut tightening mechanism further includes a pressure ring guide hole provided on a second pressure plate on one side of each nut pressure ring. The pressure ring guide hole includes a pressure ring guide portion and a threaded steel passage portion in sequence along the direction from near the first fixed plate to away from the first fixed plate. The shape of each pressure ring guide portion matches the structure of the adjacent nut pressure ring near the second pressure plate. Each pressure ring guide portion adopts a frustum-shaped structure, and the threaded steel passage portion adopts a cylindrical structure.

[0013] The beneficial effects of this utility model are as follows: First, by installing a guide ring and guide sleeve, and a pressure sensor installed between the first fixed plate and the guide ring, feedback can be easily obtained by tightening the first or second nut installed on the corresponding precision-rolled threaded steel bar, thereby providing feedback on the initial tension of the adjacent steel strands. This ensures that several steel strands can reach the preset tension range before overall tensioning, facilitating the next step of overall tensioning. During the overall tensioning process, by setting a corresponding nut clamping mechanism to tighten the first or second nut, the unexpected situation where some of the first or second nuts rotate accidentally during the overall tensioning process, causing some steel strands to fail to reach the preset tension range, is avoided.

[0014] Secondly, a pressure sensor is provided between the first fixing plate and the guide ring of this utility model. Installing the pressure sensor facilitates feedback of the pressure value between the guide ring and the first fixing plate.

[0015] Furthermore, the nut tightening mechanism of this utility model also includes third nuts respectively provided on the second screws on both sides of the first pressure plate. Installing the third nuts facilitates adjusting the position of the first pressure plate on the second screws, thereby adjusting the initial compression of several springs.

[0016] This utility model has a simple structure, is easy to operate, and has a clever design, which greatly improves work efficiency and has good social and economic benefits. It is a product that is easy to promote and use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 for Figure 1 A magnified view of detail A.

[0019] Figure 3 for Figure 1 A magnified view of detail B. Detailed Implementation

[0020] like Figures 1 to 3As shown, a tensioning device for a pre-tensioned beam includes an anchoring end beam 1 and a tensioning end beam 2. A platform force-transmitting column 3 is provided between the anchoring end beam 1 and the tensioning end beam 2. A guide ring 4 is provided on the side of the tensioning end beam 2 away from the anchoring end beam 1. A guide sleeve 5 is provided on the guide ring 4. A first fixing plate 6 is provided on the end of the guide sleeve 5 away from the tensioning end beam 2. A second fixing plate 7 is provided on the side of the first fixing plate 6 away from the guide sleeve 5. A plurality of first hydraulic cylinders 8 are provided on the second fixing plate 7 and the first fixing plate 6. A plurality of steel strand fixing devices are provided on the end of the anchoring end beam 1 away from the tensioning end beam 2. Each steel strand fixing device has one end of a steel strand 9, and the other end of each steel strand 9 has one end of a pole connector. The other end of each pole connector has a fine-rolled threaded steel bar 10. Several fine-rolled threaded steel bars 10 are installed on the first fixing plate 6 and the second fixing plate 7. Several fine-rolled threaded steel bars 10 on the side of the first fixing plate 6 away from the anchor end beam 1 are respectively provided with a first nut 11. Several fine-rolled threaded steel bars 10 on the side of the second fixing plate 7 away from the first fixing plate 6 are respectively provided with a second nut 12. A pressure sensor 13 is provided between the first fixing plate 6 and the guide ring 4. Each of the aforementioned steel strand fixing devices includes a single-hole anchor 14 disposed on the corresponding steel strand 9 and a first tool clamping plate group 15 disposed on the corresponding steel strand 9 and the single-hole anchor 14; each of the aforementioned pole connectors includes a first connecting sleeve 16 disposed on the corresponding steel strand 9, a second tool clamping plate group 17 disposed on the corresponding steel strand 9 and the first connecting sleeve 16, one end of a first screw 18 disposed on the first connecting sleeve 16, the other end of the first screw 18, and a second connecting sleeve 19 disposed on the corresponding precision-rolled threaded steel bar 10. A clamping ring 20 is disposed on the first screw 18 between the first connecting sleeve 16 and the second connecting sleeve 19. The clamping ring 20 adopts a polygonal prism-shaped tubular structure, and the inner wall of the clamping ring 20 is connected to the side wall of the first screw 18; the installation of the clamping ring 20 facilitates the rotation of the first screw 18. The inner cavity of the first connecting sleeve 16 includes a first threaded connecting cavity and a clamp guide cavity in sequence along the direction from near the second connecting sleeve 19 to away from the second connecting sleeve 19. The clamp guide cavity adopts a frustum-shaped structure. The diameter of the inner cavity of the clamp guide cavity gradually decreases along the direction from near the second connecting sleeve 19 to away from the second connecting sleeve 19. The second tool clamp group 17 is installed in the clamp guide cavity.

[0021] The guide ring 4 adopts a ring structure, and the guide sleeve 5 adopts a ring structure that can slide along the inner cavity of the guide ring 4. The central axis of the guide sleeve 5 and the central axis of the guide ring 4 are located on the same axis. The number of pressure sensors 13 is several, and the pressure sensors 13 are evenly distributed in a star shape on the guide ring 4 and the first fixing plate 6 outside the central axis of the guide ring 4. Installing several pressure sensors 13 facilitates the feedback of the pressure value between the guide ring 4 and the first fixing plate 6.

[0022] During the overall tensioning of several steel strands 9, in order to prevent some of the first nuts 11 or some of the second nuts 12 from rotating unexpectedly, resulting in inconsistent tension of the tensioned steel strands, this product is equipped with nut clamping mechanisms on both the first fixing plate 6 and the second fixing plate 7. The nut clamping mechanism includes a second screw 21 on the first fixing plate 6 or the second fixing plate 7, a first pressure plate 22 on the second screw 21, a guide tube 23 on each fine-rolled threaded steel bar 10 and the first pressure plate 22, a nut clamping ring 24 on one end of each guide tube 23 near the first fixing plate 6, a spring 25 on the corresponding guide tube 23 between each nut clamping ring 24 and the first pressure plate 22, a second pressure plate 26 on several nut clamping rings 24, and a second hydraulic cylinder 27 on the second pressure plate 26 and the first pressure plate 22. The nut clamping mechanism uses a nut clamping ring 24 to press the first nut 11 or the second nut 12 under the push of a corresponding spring 25, thereby reducing the possibility of the first nut 11 or the second nut 12 rotating unexpectedly.

[0023] The nut tightening mechanism also includes third nuts 28 respectively provided on the second screws 21 on both sides of the first pressure plate 22. Installing the third nuts 28 facilitates the adjustment of the position of the first pressure plate 22 on the second screws 21, thereby adjusting the initial compression of the several springs 25. The number of the second screws 21 and the number of the second hydraulic cylinders 27 of the nut tightening mechanism are both several. The several second screws 21 and the several second hydraulic cylinders 27 of the nut tightening mechanism are evenly distributed in a star shape on the outside of the central axis of the first pressure plate 22. The central axis of the first pressure plate 22 and the central axis of the second pressure plate 26 are located on the same axis.

[0024] The nut tightening mechanism further includes a ring guide hole 29 on the second pressure plate 26 on one side of each nut ring 24. The ring guide hole 29 sequentially includes a ring guide portion and a threaded steel passage portion along the direction from near the first fixed plate 6 to away from the first fixed plate 6. The shape of each ring guide portion matches the structure of the adjacent nut ring 24 near the second pressure plate 26. The central axis of the nut ring 24 and the central axis of the guide tube 23 are on the same axis, thus facilitating movement along the central axis of the guide tube 23 during the movement of the nut ring 24 and guide tube 23 towards the first pressure plate 22 using the guide formed by the ring guide hole 29. Each ring guide portion has a frustum-shaped structure. The minimum inner diameter of the ring guide hole 29 is not less than the circumscribed circle diameter of the first nut 11, and the minimum inner diameter of the ring guide hole 29 is not less than the circumscribed circle diameter of the second nut 12. The threaded steel passage portion has a cylindrical structure.

[0025] The usage instructions for this product are as follows: Figures 1 to 3 As shown, it includes the following steps:

[0026] S1. First, one end of several steel strands 9 is fixed by installing corresponding steel strand fixing devices on the anchor end beam 1. Then, one end of the pole connector is installed on the other end of each steel strand 9. Finally, a corresponding precision-rolled threaded steel bar 10 is installed on the other end of each pole connector.

[0027] S2. First, adjust the second hydraulic cylinder 27 in the nut clamping mechanism installed on the second fixed plate 7 to the return state, and connect the nut clamping rings 24 adjacent to the second nuts 12 and the corresponding second pressure plates 26. Then, tighten the second nuts 12 in sequence. During this process, pay attention to the average value of the values ​​fed back by the pressure sensors 13, so that the average value of the rise values ​​fed back by the pressure sensors 13 after tightening each second nut 12 is approximately equal. Finally, adjust the second hydraulic cylinder 27 in the nut clamping mechanism installed on the second fixed plate 7 to the outward state. The second nuts 12 are all pushed onto the second fixed plate 7 by the adjacent nut clamping rings 24. At this time, the second fixed plate 7 adjacent to the second nuts 12 is located outside the second nuts 12.

[0028] S3. Open several first hydraulic cylinders 8. At this time, several first hydraulic cylinders 8 work together to drive the second fixed plate 7 to move away from the first fixed plate 6 to a preset position. During this period, the second pressure plate 26 adjacent to the second fixed plate 7 is located outside several second nuts 12. Each second nut 12 is pressed onto the second fixed plate 7 by the adjacent nut pressure ring 24. As the position of several fine-rolled threaded steel bars 10 changes, the corresponding fine-rolled threaded steel bar 10 strand 9 completes one tensioning process, and several first hydraulic cylinders 8 complete one top-out process.

[0029] S4. Adjust the second hydraulic cylinder 27 in the nut clamping mechanism installed on the first fixed plate 6 to the return state, and connect the nut clamping rings 24 adjacent to the first nuts 11 and the corresponding second pressure plates 26; then, tighten the first nuts 11 in sequence, and during this process, pay attention to the average value of the values ​​fed back by the pressure sensors 13, so that the average value of the rise value fed back by the pressure sensors 13 after tightening each first nut 11 is approximately equal; finally, adjust the second hydraulic cylinder 27 in the nut clamping mechanism installed on the first fixed plate 6 to the outward state, and the first nuts 11 are all pushed onto the first fixed plate 6 by the adjacent nut clamping rings 24. At this time, the first fixed plate 6 adjacent to the first nuts 11 is located outside the first nuts 11.

[0030] S5. Open several first hydraulic cylinders 8. At this time, several first hydraulic cylinders 8 work together to drive the second fixed plate 7 to move toward the first fixed plate 6 to the preset position. During this period, the second hydraulic cylinder 27 in the nut clamping mechanism installed on the second fixed plate 7 is still in the top-out state. Since the positions of several fine rolled threaded steel bars 10 have not changed relative to each other under the limit of several first nuts 11, the tension of several steel strands 9 remains unchanged, and several first hydraulic cylinders 8 complete one top-out process.

[0031] S6. Repeat steps S2 to S5 until several steel strands 9 reach the preset tension.

[0032] This embodiment achieves feedback on the initial tension of adjacent steel strands 9 by installing guide ring 4 and guide sleeve 5, and pressure sensor 13 installed between first fixing plate 6 and guide ring 4, through tightening the first nut 11 or second nut 12 installed on the corresponding fine-rolled threaded steel bar 10. This ensures that several steel strands 9 reach the preset tension range before overall tensioning, facilitating the next step of overall tensioning. During overall tensioning, a corresponding nut clamping mechanism is used to tighten the first nut 11 or second nut 12, preventing accidental rotation of some first nuts 11 or second nuts 12 during overall tensioning, which could lead to some steel strands 9 failing to reach the preset tension range.

[0033] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A tensioning device for a pre-tensioned beam, comprising an anchoring end crossbeam (1) and a tensioning end crossbeam (2), wherein a platform force-transmitting column (3) is provided between the anchoring end crossbeam (1) and the tensioning end crossbeam (2), characterized in that: A guide ring (4) is provided on the side of the tensioning end beam (2) away from the anchoring end beam (1). A guide sleeve (5) is provided on the guide ring (4). A first fixing plate (6) is provided on the end of the guide sleeve (5) away from the tensioning end beam (2). A second fixing plate (7) is provided on the side of the first fixing plate (6) away from the guide sleeve (5). Several first hydraulic cylinders (8) are provided on the second fixing plate (7) and the first fixing plate (6). Several steel strand fixing devices are provided on the end of the anchoring end beam (1) away from the tensioning end beam (2). Each steel strand fixing device is provided with one end of a steel strand (9). (9) is provided with a wire rod connector at one end, and a fine-rolled threaded steel bar (10) is provided at the other end of each wire rod connector. Several fine-rolled threaded steel bars (10) are installed on the first fixing plate (6) and the second fixing plate (7). Several fine-rolled threaded steel bars (10) on the side of the first fixing plate (6) away from the anchor end beam (1) are provided with a first nut (11). Several fine-rolled threaded steel bars (10) on the side of the second fixing plate (7) away from the first fixing plate (6) are provided with a second nut (12). A pressure sensor (13) is provided between the first fixing plate (6) and the guide ring (4).

2. The tensioning device for pre-tensioned beams according to claim 1, characterized in that: Each of the aforementioned steel strand fixing devices includes a single-hole anchor (14) provided on the corresponding steel strand (9) and a first tool clamping plate group (15) provided on the corresponding steel strand (9) and the single-hole anchor (14); each of the aforementioned pole connectors includes a first connecting sleeve (16) provided on the corresponding steel strand (9), a second tool clamping plate group (17) provided on the corresponding steel strand (9) and the first connecting sleeve (16), one end of a first screw (18) provided on the first connecting sleeve (16) and the other end of the first screw (18) and a second connecting sleeve (19) provided on the corresponding fine-rolled threaded steel (10).

3. The tensioning device for pre-tensioned beams according to claim 2, characterized in that: The inner cavity of the first connecting sleeve (16) includes a first threaded connecting cavity and a clamp guide cavity in sequence along the direction from near the second connecting sleeve (19) to away from the second connecting sleeve (19). The clamp guide cavity adopts a frustum-shaped structure. The diameter of the inner cavity of the clamp guide cavity gradually decreases along the direction from near the second connecting sleeve (19) to away from the second connecting sleeve (19). The second tool clamp group (17) is installed in the clamp guide cavity.

4. The tensioning device for pre-tensioned beams according to claim 1, characterized in that: The guide ring (4) adopts a ring structure, and the guide sleeve (5) adopts a ring structure that can slide along the inner cavity of the guide ring (4). The central axis of the guide sleeve (5) and the central axis of the guide ring (4) are located on the same axis. The number of pressure sensors (13) is several. The pressure sensors (13) are evenly distributed in a star shape on the guide ring (4) and the guide sleeve (5) outside the central axis of the guide ring (4).

5. The tensioning device for pre-tensioned beams according to claim 1, characterized in that: The first fixed plate (6) and the second fixed plate (7) are each provided with a nut clamping mechanism. The nut clamping mechanism includes a second screw (21) provided on the first fixed plate (6) or the second fixed plate (7), a first pressure plate (22) provided on the second screw (21), a guide tube (23) provided on each fine-rolled threaded steel bar (10) and the first pressure plate (22), a nut clamping ring (24) provided on one end of each guide tube (23) near the first fixed plate (6), a spring (25) provided on the corresponding guide tube (23) between each nut clamping ring (24) and the first pressure plate (22), a second pressure plate (26) provided on several nut clamping rings (24), and a second hydraulic cylinder (27) provided on the second pressure plate (26) and the first pressure plate (22).

6. The tensioning device for pre-tensioned beams according to claim 5, characterized in that: The nut tightening mechanism also includes a third nut (28) respectively provided on the second screw (21) on both sides of the first pressure plate (22); the number of the second screw (21) of the nut tightening mechanism and the number of the second hydraulic cylinder (27) of the nut tightening mechanism are both several. The several second screws (21) of the nut tightening mechanism and the several second hydraulic cylinders (27) of the nut tightening mechanism are all evenly distributed in a star shape on the outside of the central axis of the first pressure plate (22). The central axis of the first pressure plate (22) and the central axis of the second pressure plate (26) are located on the same axis.

7. The tensioning device for pre-tensioned beams according to claim 5, characterized in that: The nut clamping mechanism further includes a pressure ring guide hole (29) provided on the second pressure plate (26) on one side of each nut pressure ring (24). The pressure ring guide hole (29) includes a pressure ring guide part and a threaded steel passage part in sequence along the direction from near the first fixed plate (6) to away from the first fixed plate (6). The shape of each pressure ring guide part is matched with the part of the adjacent nut pressure ring (24) near the second pressure plate (26). The shape of each pressure ring guide part adopts a frustum-shaped structure, and the shape of the threaded steel passage part adopts a cylindrical structure.

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