Prestressed devices for long-span continuous steel bridges

Abstract

This application relates to the field of bridge construction equipment, and in particular to a prestressing device for a long-span continuous steel bridge. It includes two clamping discs, each with a clamping groove for holding cables on its opposite sides, and the discs are connected. An installation groove with one open side is located inside the bridge. Rotating shafts are coaxially arranged on opposite sides of the two clamping discs. A support rod is mounted on the bottom wall of the installation groove. One rotating shaft rotatably passes through the side wall of the installation groove, and the other rotating shaft rotatably passes through the support rod. The installation groove contains a pulling disc assembly for rotating the clamping discs to tension the cables, and a locking assembly for locking the tensioned clamping discs. The clamping grooves are symmetrical about the axis of the clamping discs and are S-shaped. The positions of the cables relative to the ends of the clamping grooves are tangent to the outer circumference of the clamping discs. This application has the advantage of conveniently controlling external prestressing.

Description

Technical Field

[0001] This application relates to the field of bridge engineering construction equipment, and in particular to a prestressed device for long-span continuous steel bridges. Background Technology

[0002] Continuous steel structure bridges are one of the most commonly used bridge types for long-span concrete bridges, with advantages such as strong site adaptability, large span capacity, and low maintenance costs.

[0003] During external prestressing construction, the cables are placed between adjacent piers, and tension is applied to both ends of the cables using a large-tonnage tensioning device. The axial tension of the cables is converted into an upward jacking force by a steering block, and then the two ends of the cables are anchored.

[0004] Due to the significant inconvenience in operating and transporting large-tonnage tensioning equipment, it is quite difficult to control the external prestress through large-tonnage tensioning equipment when the deflection of a continuous steel structure bridge gradually increases in the later stages, and there are obvious shortcomings. Summary of the Invention

[0005] To improve the ease of external prestress control, this application provides a prestressing device for long-span continuous steel bridges.

[0006] The prestressing device for a long-span continuous steel bridge provided in this application adopts the following technical solution:

[0007] A prestressing device for a long-span continuous steel bridge includes two clamping discs. The two clamping discs have clamping slots for clamping cables on opposite sides and are connected. An installation slot with one open side is opened inside the bridge. Rotating shafts are coaxially arranged on opposite sides of the two clamping discs. A support rod is provided on the bottom wall of the installation slot. One rotating shaft is rotatably inserted into the side wall of the installation slot, and the other rotating shaft is rotatably inserted into the support rod. A pulling disc assembly for pulling the clamping discs to rotate and thus tensioning the cables is provided in the installation slot, and a locking assembly for locking the tensioned clamping discs.

[0008] By adopting the above technical solution, when it is necessary to adjust the external prestress, the tensioning plate assembly pulls the clamping plate to rotate, so that the cable is wound around the outer circumference of the clamping plate, thereby adjusting the tension of the cable and thus controlling the magnitude of the prestress applied by the cable to the continuous steel structure bridge. The above-mentioned adjustment of prestress by the winding action of the clamping plate on the cable is relatively simple and labor-saving.

[0009] Optionally, the pull plate assembly includes a first jack and a first reversing wheel disposed in the mounting groove. A first pull rope is disposed on the top support end of the first jack. A tensioning plate is coaxially fixedly disposed on the clamping plate. The first pull rope passes around the first reversing wheel and is tied to the outer circumferential wall of the tensioning plate.

[0010] By adopting the above technical solution, the worker manually operates the first jack, and the top support end of the first jack pulls the tensioning disc to rotate through the first pull rope, thereby clamping the disc to rotate and adjusting the tension of the cable.

[0011] Optionally, the locking assembly includes a latch hinged in the mounting groove, and the tensioning disc is provided with a stop block for the latch to abut against.

[0012] By adopting the above technical solution, when the cable is tensioned to a sufficient degree, the latch rotates to abut the stop block, reducing the reaction force of the cable after tensioning and the possibility of the clamping disc reversing.

[0013] Optionally, the outer circumferential wall of the tensioning disc is provided with a plurality of insertion slots, and the abutment is inserted into the insertion slots and bolted to the tensioning disc.

[0014] By adopting the above technical solution, workers can connect the abutment block to different insertion slots, thereby changing the position of the abutment block to lock the cables with different tension levels.

[0015] Optionally, the mounting slot is further provided with a rotating tongue assembly for driving the tongue to rotate. The tongue is arc-shaped, and the distance between the inner arc surface of the tongue and the axis of the tensioning disc gradually decreases from the midpoint to both ends of the arc. The rotating tongue assembly includes a drive disc coaxially rotatably mounted on a rotating shaft. The outer circumferential wall of the drive disc is provided with a stop tongue for abutting the inner arc surface of the tongue. When the stop tongue abuts at the midpoint of the arc of the inner arc surface of the tongue, the distance between both ends of the inner arc surface of the tongue and the axis of the tensioning disc is equal to the maximum distance between the stop tongue and the axis of the tensioning disc. The mounting slot is also provided with a second jack and a second reversing wheel. A second pull rope is provided on the top support end of the second jack. The second pull rope passes around the second reversing wheel and is detachably connected to the outer circumferential wall of the drive disc.

[0016] By adopting the above technical solution, the worker operates the second jack, which drives the drive plate to rotate through the second pull rope. The rotation of the drive plate drives the abutment to rotate, and the abutment contacts the locking tongue and pushes it to rotate, thereby realizing the contact and unlocking between the locking tongue and the abutment block.

[0017] Optionally, at least two pull rings are provided circumferentially on the outer circumferential wall of the drive disc, and the end of the second pull rope is attached with a hook for engaging with the pull rings.

[0018] By adopting the above technical solution, workers manually attach hooks to different pull rings, so that the direction of the force on the drive disc is different under the action of the second pull rope, thereby realizing the forward and reverse rotation of the drive disc.

[0019] Optionally, the clamping groove is symmetrical about the axis of the clamping disk and is S-shaped, and the position of the cable relative to the two ends of the clamping groove is tangent to the outer circumferential wall of the clamping disk.

[0020] By adopting the above technical solution, the larger diameter of the cable and the tangential arrangement can facilitate the deformation of the cable and its winding around the outer wall of the clamping plate, and also improve the stability of the cable winding around the clamping plate.

[0021] Optionally, both the tongue and the latch are coated with polytetrafluoroethylene.

[0022] By adopting the above technical solution, polytetrafluoroethylene has a low coefficient of friction, which helps to improve the smoothness of the movement of the latch when the abutment pushes the latch to rotate.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. When it is necessary to adjust the external prestress, the pull plate assembly pulls the clamping plate to rotate, so that the cable is wound around the outer circumference of the clamping plate, thereby adjusting the tension of the cable, thereby controlling the magnitude of the prestress applied by the cable to the continuous steel structure bridge. The prestress adjustment is achieved in this way, and the operation process is relatively simple and labor-saving.

[0025] 2. The worker operates the second jack, which drives the drive plate to rotate via the second pull rope. The rotation of the drive plate causes the abutment to rotate, and the abutment contacts the locking tongue and pushes it to rotate, thereby realizing the contact and unlocking between the locking tongue and the abutment block. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0027] Figure 2 This is an exploded view of the clamping disc, tensioning disc, and drive disc in an embodiment of this application.

[0028] Figure 3 This is a cross-sectional view showing the positional relationship between the drive disc, push tongue, and latch in an embodiment of this application.

[0029] Explanation of reference numerals in the attached diagram: 1. Clamping plate; 101. Clamping groove; 2. Cable; 3. Mounting groove; 4. Shaft; 5. Support rod; 6. First jack; 7. First reversing wheel; 8. First pull rope; 9. Tensioning plate; 901. Insertion groove; 10. Clamping tongue; 11. Abutment block; 12. Drive plate; 13. Abutment tongue; 14. Second jack; 15. Second reversing wheel; 16. Second pull rope; 17. Pull ring; 18. Hook. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a prestressing device for long-span continuous steel bridges.

[0032] Reference Figure 1 and Figure 2 The prestressing device for long-span continuous steel structure bridges includes two coaxial, closely attached and bolted clamping discs 1. The two clamping discs 1 have clamping grooves 101 on opposite sides for clamping cables 2. The clamping grooves 101 are symmetrical about the axis of the clamping discs 1 and are arranged in an S-shape. The positions of the two ends of the cables 2 relative to the clamping grooves 101 are tangent to the outer circumferential wall of the clamping discs 1.

[0033] Reference Figure 1 and Figure 2 The bridge has an open mounting groove 3 on one side, and a vertical support rod 5 is bolted to the bottom wall of the mounting groove 3. Both clamping plates 1 are located in the mounting groove 3, and a rotating shaft 4 is coaxially welded to the opposite sides of the two clamping plates 1. One rotating shaft 4 is rotatably inserted into the mounting groove 3 through a bearing, and the other rotating shaft 4 is rotatably inserted into the support rod 5 through a bearing.

[0034] Reference Figure 1 and Figure 2 The mounting slot 3 is also equipped with a pull plate assembly for pulling the clamping plate 1 to rotate and thus tensioning the cable 2, and a locking assembly for locking the tensioned clamping plate 1.

[0035] Reference Figure 1 and Figure 2 The pull plate assembly includes a first jack 6 and a first reversing wheel 7 bolted to the bottom wall of the mounting groove 3. The first reversing wheel 7 is located between the first jack 6 and the clamping plate 1. The first jack 6 is a small jack commonly used in the prior art.

[0036] A tensioning disc 9 is coaxially welded to one side of a clamping disc 1. A first pull rope 8 is attached to the top support end of the first jack 6. The first pull rope 8 passes around the first reversing wheel 7 and is attached to the outer circumferential wall of the tensioning disc 9.

[0037] Reference Figure 1 and Figure 2 When the bridge's deflection increases in the later stages and the prestress needs to be adjusted, the worker manually operates the first jack 6. The top support end of the first jack 6 pulls the tensioning disc 9 to rotate through the first pull rope 8. The tensioning disc 9 drives the clamping disc 1 to rotate, so that the cable 2 is wound around the outer circumference of the clamping disc 1.

[0038] The above method allows for a simpler and less strenuous way to further tension the cable 2, thereby increasing the amount of prestress applied to the bridge and improving the bridge reinforcement effect.

[0039] Reference Figure 1 , Figure 2and Figure 3 The locking assembly includes a latch 10 hinged to the top wall of the mounting groove 3, and a stop block 11 for the latch 10 to abut against on the tensioning disc 9. When the cable 2 is tensioned to a sufficient degree, the worker rotates the latch 10 to the designated position, and the worker releases the pulling force of the first jack 6 on the clamping disc 1. The latch 10 abuts against the stop block 11 to limit the reverse rotation of the clamping disc 1, so that the clamping disc 1 remains locked.

[0040] Reference Figure 1 , Figure 2 and Figure 3 The outer circumferential wall of the tensioning disc 9 has multiple insertion slots 901, and the abutment 11 is inserted into and tightly fitted with the insertion slots 901. The insertion and fit between the abutment 11 and the insertion slots 901 can enhance the fixing strength of the abutment 11 on the tensioning disc 9, which is conducive to improving the locking effect of the abutment 11 and the latch 10.

[0041] Reference Figure 1 , Figure 2 and Figure 3 Workers insert the abutment block 11 into different insertion slots 901 to change the abutment position of the latch 10 relative to the tensioning disc 9, thereby adapting it to locking at different tension levels of the cable 2.

[0042] Reference Figure 1 , Figure 2 and Figure 3 Since the reaction force exerted by the block 11 on the latch 10 when the latch 10 abuts against the block 11 is large, it is difficult for the worker to manually rotate the latch 10 directly. Therefore, the mounting groove 3 is also equipped with a tongue rotating assembly for driving the latch 10 to rotate.

[0043] Reference Figure 1 , Figure 2 and Figure 3 The latch 10 is arc-shaped, and the distance between the inner arc surface of the latch 10 and the axis of the tensioning disc 9 gradually decreases from the midpoint to both ends of the arc. The rotating tongue assembly includes a drive disc 12 coaxially rotatably mounted on the rotating shaft 4, and an abutment 13 for abutting the inner arc surface is integrally formed on the outer circumferential wall of the drive disc 12.

[0044] When the abutment 13 is in contact with the midpoint of the arc of the inner arc surface of the latch 10, the distance between the two ends of the inner arc surface of the latch 10 and the axis of the tensioning disc 9 is exactly equal to the maximum distance between the abutment 11 and the axis of the tensioning disc 9.

[0045] Reference Figure 1 , Figure 2 and Figure 3The rotating tongue assembly also includes a second jack 14 and a second reversing wheel 15 bolted to the bottom wall of the mounting groove 3. The second reversing wheel 15 is located between the second jack 14 and the clamping plate 1. The second jack 14 is a small jack in the prior art.

[0046] Reference Figure 1 , Figure 2 and Figure 3 Two pull rings 17 are welded to the outer circumference of the drive disc 12. A second pull rope 16 is attached to the top support end of the second jack 14. The second pull rope 16 passes around the second reversing wheel 15 and is attached to a hook 18, which is hooked onto the pull ring. When the hook 18 is hooked onto different pull rings, the drive disc 12 rotates in different directions.

[0047] Reference Figure 1 , Figure 2 and Figure 3 When the latch 10 is pressed against the stop block 11, the worker operates the second jack 14. The top support end of the second jack 14 pulls the drive plate 12 to rotate through the second pull rope 16. The drive plate 12 drives the stop 13 to rotate. The stop 13 pushes the latch 10 to rotate. When the stop 13 rotates to the midpoint of the arc of the latch 10, the latch 10 releases its contact with the stop block 11.

[0048] After the prestressing of cable 2 is adjusted, the worker manually attaches hook 18 to another pull ring 17. When the worker operates the second jack 14, the drive disc 12 drives the tongue 13 to rotate in the opposite direction, so that the latch 10 is rotated under force to re-tighten the block 11.

[0049] Reference Figure 1 , Figure 2 and Figure 3 Both the abutment 13 and the latch 10 are coated with polytetrafluoroethylene (PTFE). PTFE has a low coefficient of friction, which allows the abutment 13 to drive the latch 10 to rotate more smoothly and effortlessly.

[0050] Reference Figure 1 A sealing door (not shown in the figure) is hinged at the position of the bridge relative to the open side of the mounting groove 3, and the sealing door is locked to the bridge by a pin (not shown in the figure). The sealing door protects the prestressing device and reduces the possibility of the prestressing device being accelerated to age and rust due to wind, sun and rain.

[0051] The implementation principle of a prestressed device for a long-span continuous steel structure bridge according to an embodiment of this application is as follows: the worker checks the deflection of the bridge, then inserts the abutment block 11 into the appropriate insertion slot 901, and bolts it to the tensioning plate 9. After that, the top support end of the first jack 6 extends upward, and the first pull rope 8 drives the clamping plate 1 to rotate through the tensioning plate 9. The cable 2 is wound around the outer circumference of the clamping plate 1.

[0052] After the stop block 11 passes through the appropriate position, the second jack 14 drives the drive plate 12 to rotate through the second pull rope 16. The drive plate 12 drives the stop tongue 13 to rotate. The stop tongue 13 pushes the latch 10 to rotate until it abuts the stop block 11. Both the second jack 14 and the first jack 6 are released from the supporting state.

[0053] When unlocking, the worker attaches hook 18 to another pull ring 17, then operates the second jack 14, and the second pull rope 16 pulls the drive disc 12 to rotate in the opposite direction, thereby pushing the latch 10 out of contact with the block 11, thus releasing the tension of the clamping disc 1 on the pull rope.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prestressing device for a long-span continuous steel structure bridge, characterized in that: The bridge includes two clamping discs (1), with clamping grooves (101) for clamping cables (2) on opposite sides and connected to each other. There is an installation groove (3) with one side open inside the bridge. Rotating shafts (4) are coaxially arranged on opposite sides of the two clamping discs (1). A support rod (5) is provided on the bottom wall of the installation groove (3). One rotating shaft (4) is rotatably inserted into the side wall of the installation groove (3), and the other rotating shaft (4) is rotatably inserted into the support rod (5). The installation groove (3) is provided with a pull plate assembly for pulling the clamping discs (1) to rotate so that the cables (2) are tensioned, and a locking assembly for locking the clamping discs (1) after tensioning.

2. The prestressed device for long-span continuous steel bridges according to claim 1, characterized in that: The pull plate assembly includes a first jack (6) and a first reversing wheel (7) disposed in the mounting groove (3). A first pull rope (8) is provided on the top support end of the first jack (6). A tensioning plate (9) is coaxially fixedly disposed on the clamping plate (1). The first pull rope (8) passes around the first reversing wheel (7) and is tied to the outer circumferential wall of the tensioning plate (9).

3. The prestressed device for long-span continuous steel bridges according to claim 2, characterized in that: The locking assembly includes a latch (10) hinged in the mounting groove (3), and the tensioning disc (9) is provided with a stop block (11) for the latch (10) to abut against.

4. The prestressed device for long-span continuous steel bridges according to claim 3, characterized in that: The tensioning disc (9) has a plurality of insertion slots (901) circumferentially opened on the outer circumferential wall. The abutment (11) is inserted into the insertion slots (901) and bolted to the tensioning disc (9).

5. The prestressed device for long-span continuous steel bridges according to claim 3, characterized in that: The mounting groove (3) is also provided with a rotating tongue assembly for driving the latch (10) to rotate. The latch (10) is arc-shaped, and the distance between the inner arc surface of the latch (10) and the axis of the tensioning disc (9) gradually decreases from the midpoint to both ends of the arc. The rotating tongue assembly includes a drive disc (12) coaxially rotatably mounted on the rotating shaft (4). The outer circumferential wall of the drive disc (12) is provided with a stop tongue (13) for abutting the inner arc surface of the latch (10). When the stop tongue (13) abuts the latch (10)... 0) At the midpoint of the inner arc surface, the distance between the two ends of the inner arc surface of the latch (10) and the axis of the tensioning disc (9) is equal to the maximum distance between the abutment (11) and the axis of the tensioning disc (9). The mounting groove (3) is also provided with a second jack (14) and a second reversing wheel (15). A second pull rope (16) is provided on the top support end of the second jack (14). The second pull rope (16) passes around the second reversing wheel (15) and is detachably connected to the outer circumferential wall of the drive disc (12).

6. The prestressed device for long-span continuous steel bridges according to claim 5, characterized in that: At least two pull rings (17) are provided circumferentially on the outer circumferential wall of the drive disc (12), and the end of the second pull rope (16) is attached with a hook (18) for attaching to the pull rings (17).

7. The prestressed device for long-span continuous steel bridges according to claim 1, characterized in that: The clamping groove (101) is symmetrical about the axis of the clamping disk (1) and is arranged in an S-shape. The position of the cable (2) relative to the two ends of the clamping groove (101) is tangent to the outer circumferential wall of the clamping disk (1).

8. The prestressed device for long-span continuous steel bridges according to claim 5, characterized in that: Both the tongue (13) and the latch (10) are coated with polytetrafluoroethylene.

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