A suspension bridge steel truss anti-traction system and end beam swinging construction method

Abstract

This application discloses a reverse traction system for a suspension bridge steel truss girder and a method for constructing the swinging movement of the end girder. The reverse traction system for the suspension bridge steel truss girder includes a winch, a first traction pulley, and a second traction pulley. The winch is installed on the bridge abutment foundation, the first traction pulley is installed on the approach bridge, and the second traction pulley is connected to the object being pulled. The output end of the winch is connected to a traction cable, and the end of the traction cable away from the winch passes through the second traction pulley and connects to the first traction pulley. By adopting the above technical solution, installing a winch on the bridge abutment foundation, and then connecting the traction cable through the second traction pulley to the first traction pulley, it is easier to apply traction force to the object being pulled through the second traction pulley. This reduces the possibility of the steel truss girder tipping over during transportation and also serves as the traction force for the swinging movement of the steel truss girder, ensuring the reliable execution of the swinging movement.

Description

Technical Field

[0001] This application relates to the field of steel truss girder swinging construction technology, and in particular to a suspension bridge steel truss girder anti-traction system and end girder swinging construction method. Background Technology

[0002] During the construction of a suspension bridge, after the first steel truss girder is erected, subsequent steel trusses are transported directly from the approach bridge to the first steel truss girder via a girder transport vehicle. After passing through the blind spot of the cable crane, they are hoisted by the cable crane. However, during this process, due to the trajectory of the suspension bridge and the downward deflection caused by the excessive weight of the girder transport vehicle, the trajectory of the steel truss girder during transportation will gradually become a downward deflection curve, which may cause the steel truss girder to slip or collapse. Summary of the Invention

[0003] The purpose of this application is to provide a reverse traction system for a steel truss girder of a suspension bridge and a method for constructing a swing-moving end beam, so as to improve the problem of possible slippage of the steel truss girder during downhill transportation.

[0004] Firstly, this application provides a suspension bridge steel truss anti-traction system, which adopts the following technical solution: A reverse traction system for a steel truss girder of a suspension bridge includes a winch, a first traction pulley, and a second traction pulley. The winch is installed on the bridge bank foundation, the first traction pulley is installed on the approach bridge, and the second traction pulley is connected to the object being traction. The output end of the winch is connected to a traction cable, and the end of the traction cable away from the winch passes through the second traction pulley and is connected to the first traction pulley.

[0005] By adopting the above technical solution, a winch is installed on the bridge bank foundation, and then the traction cable is passed through the second traction pulley and connected to the first traction pulley. This facilitates the application of traction force to the towed object through the second traction pulley, which can reduce the possibility of the steel truss beam tipping over during transportation. At the same time, it can serve as the traction force for the swinging of the steel truss beam, ensuring the reliable swinging.

[0006] Optionally, a first steering pulley and a second steering pulley are installed on the bridge bank foundation, and the traction cable passes through the first steering pulley and the second steering pulley in sequence before contacting the second traction pulley.

[0007] With the above technical solution, the winches are set on both sides of the suspension bridge, which makes it easy to leave a passage for the beam transport vehicle to move in the middle. The first and second steering pulleys facilitate the steering of the traction cable so that the traction cable can better contact the second traction pulley.

[0008] Optionally, the winch, the first steering pulley, the second steering pulley, the first traction pulley, the second traction pulley, and the traction cable are all provided in two sets, and the distance between the portions of the two traction cables located between the second steering pulley and the second traction pulley gradually decreases along the direction from the second steering pulley toward the second traction pulley.

[0009] Optionally, the distance between the portions of the two traction cables located between the first and second traction pulleys gradually decreases along the direction from the first traction pulley toward the second traction pulley.

[0010] By adopting the above technical solution, the two sets of traction ropes are set at an angle, which can avoid the possibility of interference between the traction ropes.

[0011] Optionally, the distance between the two second pulleys is less than the distance between the two first pulleys.

[0012] By using the above technical solution, the second traction pulley is set inside the first traction pulley, which can increase the wrap angle between the traction cable and the second traction pulley, thereby increasing the friction between the traction cable and the second traction pulley and reducing the possibility of slippage between the traction cable and the second traction pulley.

[0013] Optionally, the portion of the traction cable located between the first and second traction pulleys is lower than the portion of the traction cable located between the second steering pulley and the second traction pulley.

[0014] By adopting the above technical solution, the traction cable between the first traction pulley and the second traction pulley is lower, which facilitates connection with the surface of the approach bridge.

[0015] Optionally, a knot is connected to the second pulley, and the knot is connected to the approach bridge.

[0016] By adopting the above technical solution, the knot connection is easy to install and disassemble quickly, thus making it easy to adapt to different objects being pulled.

[0017] Secondly, this application provides a method for constructing an end beam swing-shifting structure.

[0018] A method for constructing an end beam swing-shifting structure, based on the aforementioned anti-traction system for a suspension bridge steel truss girder, includes the following steps: S1. Install corbel structure on the first section of steel truss beam; S2. Connect the hook of the cable crane to the first section of the steel truss beam, and connect the second traction pulley to the corbel structure; S3. The first section of the steel truss is lifted to the set height by a cable crane, and at this time the winch simultaneously winds up the traction cable. S4. Subsequently, the cable crane moves the first section of steel truss girder toward the main tower crossbeam, and at this time the winch simultaneously winds up the traction cable. S5. When the cable crane moves into its own blind zone, the winch rewinds the traction cable and pulls the first section of the steel truss beam to move above the crossbeam. S6. Subsequently, the cable crane lowers the first steel truss section, so that one section of the first steel truss section falls onto the main tower crossbeam, and connects the first steel truss section to the main tower crossbeam. Then, a permanent suspender is installed on the main cable of the suspension bridge, and the permanent suspender is connected to the end of the first steel truss section away from the main tower crossbeam.

[0019] Optionally, the following steps may also be included: S7. Remove the corbel structure from the first section of the steel truss beam and remove the second traction pulley from the corbel structure; S8. The beam transport vehicle transports the subsequent steel truss girder to the position of the approach bridge near the first steel truss girder. At this time, the second traction pulley is connected to the subsequent steel truss girder. S9. The beam transport vehicle continues to transport the subsequent steel truss beams to the first steel truss beam. During the transport process, the winch applies a counter-traction force to the subsequent steel truss beams through the traction cable.

[0020] Optionally, the following steps may also be included: S10. After the subsequent steel truss girder is transported to the first steel truss girder, the hook of the cable crane is connected to the subsequent steel truss girder. S11. The cable crane lifts the first steel truss section and moves it to the designed position. Then the cable crane lowers the subsequent steel truss section and connects one end of the subsequent steel truss section to the first steel truss section. The other end of the subsequent steel truss section is connected to the main cable of the suspension bridge through a permanent sling. S12. Repeat the above steps until all subsequent steel truss beams are installed.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. Install a winch on the bridge bank foundation, then pass the traction cable through the second traction pulley and connect it to the first traction pulley. This facilitates the application of traction force to the towed object through the second traction pulley, which can reduce the possibility of the steel truss beam tipping over during transportation. At the same time, it can serve as the traction force for the swinging of the steel truss beam, ensuring the reliable swinging process. 2. The winches are set on both sides of the suspension bridge to facilitate the leaving of a passage for the beam transport vehicle to move in the middle. The first and second steering pulleys facilitate the steering of the traction cable so that the traction cable can better contact the second traction pulley. 3. The two sets of traction ropes are set at an angle to avoid possible interference between the traction ropes; 4. The fact that the second pulley is located inside the first pulley can increase the wrap angle between the traction cable and the second pulley, thereby increasing the friction between the traction cable and the second pulley and reducing the possibility of slippage between the traction cable and the second pulley; 5. The traction cable between the first and second traction pulleys is lower, making it easier to connect to the surface of the approach bridge. Attached Figure Description

[0022] Figure 1 This is a side view schematic diagram illustrating the anti-traction system of the suspension bridge steel truss girder traction of the first steel truss girder in this invention.

[0023] Figure 2 This is a top view schematic diagram illustrating the positional relationship between the second steering pulley, the first traction pulley, and the second traction pulley in this invention.

[0024] Figure 3 This is a side view schematic diagram illustrating the positional relationship between the second steering pulley, the first traction pulley, and the second traction pulley in this invention.

[0025] Figure 4 yes Figure 1 A magnified view of part A in the middle.

[0026] Figure 5 yes Figure 1 A magnified view of part B in the middle.

[0027] Figure 6 This is a top view schematic diagram illustrating the anti-traction system of the suspension bridge steel truss girder traction of the first steel truss girder in this invention.

[0028] Figure 7 yes Figure 6 A magnified view of part C in the middle.

[0029] Figure 8 This is a side view schematic diagram illustrating the anti-traction system of the suspension bridge steel truss beam in this invention, which tractions the subsequent steel truss beam.

[0030] In the diagram, 1. Bridge abutment foundation; 11. Winch; 12. Traction cable; 13. First steering pulley; 14. Second steering pulley; 2. Approach bridge; 21. First traction pulley; 3. Second traction pulley; 4. First steel truss girder; 41. Corbel structure; 5. Subsequent steel truss girder; 6. Cable crane; 7. Main tower crossbeam. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0032] 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," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Example 1 In the first aspect, this application discloses a reverse traction system for a steel truss girder of a suspension bridge.

[0034] A suspension bridge steel truss anti-traction system, referring to Figures 1 to 7 The system includes a winch 11, a first traction pulley 21, and a second traction pulley 3. The winch 11 is installed on the bridge abutment foundation 1, the first traction pulley 21 is installed on the approach bridge 2, and the second traction pulley 3 is connected to the object being pulled. A traction cable 12 is connected to the output end of the winch 11. The end of the traction cable 12 away from the winch 11 passes through the second traction pulley 3 and connects to the first traction pulley 21. Installing the winch 11 on the bridge abutment foundation 1 and then connecting the traction cable 12 through the second traction pulley 3 to the first traction pulley 21 facilitates the application of traction force to the object being pulled through the second traction pulley 3. This reduces the possibility of the steel truss beam tipping over during transportation and also serves as the traction force for the swinging of the steel truss beam, ensuring reliable swinging.

[0035] A first steering pulley 13 and a second steering pulley 14 are installed on the bridge foundation 1. The traction cable 12 passes through the first steering pulley 13 and the second steering pulley 14 in sequence before contacting the second traction pulley 3. The winch 11 is set on both sides of the suspension bridge to facilitate the leaving of a passage for the beam transport vehicle in the middle. The first steering pulley 13 and the second steering pulley 14 facilitate the steering of the traction cable 12 so that the traction cable 12 can better contact the second traction pulley 3.

[0036] The winch 11, the first steering pulley 13, the second steering pulley 14, the first traction pulley 21, the second traction pulley 3, and the traction ropes 12 are all provided in two sets. The distance between the portions of the two traction ropes 12 located between the second steering pulley 14 and the second traction pulley 3 gradually decreases along the direction from the second steering pulley 14 towards the second traction pulley 3. The distance between the portions of the two traction ropes 12 located between the first traction pulley 21 and the second traction pulley 3 gradually decreases along the direction from the first traction pulley 21 towards the second traction pulley 3. The two sets of traction ropes are inclined to avoid possible interference between the traction ropes.

[0037] Furthermore, the distance between the two second traction pulleys 3 is less than the distance between the two first traction pulleys 21. The second traction pulleys 3, positioned inside the first traction pulleys 21, increase the wrap angle between the traction cable 12 and the second traction pulleys 3, thereby increasing the friction between them and reducing the possibility of slippage. The portion of the traction cable 12 between the first traction pulleys 21 and the second traction pulleys 3 is lower than the portion between the second steering pulley 14 and the second traction pulleys 3. This lower traction cable 12 between the first traction pulleys 21 and the second traction pulleys 3 facilitates connection to the surface of the approach bridge 2.

[0038] A knot is attached to the second traction pulley 3, and the knot connects to the approach bridge 2. The knot connection facilitates quick installation and disassembly, thus making it easy to adapt to different objects being pulled.

[0039] Secondly, this application provides a method for constructing an end beam swing-shifting structure.

[0040] A method for constructing an end beam swing-and-shift structure, based on the aforementioned anti-traction system for steel truss girders in suspension bridges, with reference to... Figure 1 and Figure 8 It includes the following steps: S1. Install the corbel structure 41 on the first steel truss beam 4.

[0041] S2. Connect the hook of the cable crane 6 to the first steel truss beam 4, and connect the second traction pulley 3 to the corbel structure 41.

[0042] S3. The first section of steel truss 4 is lifted to the set height by the cable crane 6, and at this time the winch 11 simultaneously winds up the traction cable 12.

[0043] S4. Subsequently, the cable crane 6 drives the first section of steel truss 4 to move toward the main tower crossbeam 7, at which time the winch 11 simultaneously winds up the traction cable 12.

[0044] S5. When the cable crane 6 moves into its own blind zone, the winch 11 winds up the traction cable 12 and pulls the first section of steel truss 4 to move above the crossbeam.

[0045] S6. Then, the cable crane 6 lowers the first steel truss girder 4, so that one part of the first steel truss girder 4 falls on the main tower crossbeam 7, and connects the first steel truss girder 4 to the main tower crossbeam 7. Then, a permanent suspender is installed on the main cable of the suspension bridge, and the permanent suspender is connected to the end of the first steel truss girder 4 away from the main tower crossbeam 7.

[0046] S7. Remove the corbel structure 41 from the first section of steel truss beam 4, and remove the second traction pulley 3 from the corbel structure 41.

[0047] S8. The beam transport vehicle transports the subsequent steel truss beam 5 to the approach bridge 2 near the first steel truss beam 4. At this time, the second traction pulley 3 is connected to the subsequent steel truss beam 5.

[0048] S9. The beam transport vehicle continues to transport the subsequent steel truss beam 5 to the first steel truss beam 4. During the transport process, the winch 11 applies a counter-traction force to the subsequent steel truss beam 5 through the traction cable 12.

[0049] S10. After the subsequent steel truss girder 5 is transported to the first steel truss girder 4, the hook of the cable crane 6 is connected to the subsequent steel truss girder 5.

[0050] S11. Cable crane 6 lifts the first steel truss girder 4 and moves it to the designed position. Then, cable crane 6 lowers the subsequent steel truss girder 5 and connects one end of the subsequent steel truss girder 5 to the first steel truss girder 4. The other end of the subsequent steel truss girder 5 is connected to the main cable of the suspension bridge through a permanent sling.

[0051] S12. Repeat the above steps until all subsequent steel truss beams 5 are installed.

[0052] Working principle: A traction system can not only traction the steel truss beam to move, but also prevent the steel truss beam from tipping over during transportation.

[0053] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A counter-pulling system for a steel truss girder of a suspension bridge, characterized in that, The bridge bank foundation (1) is provided with a first diverting pulley (13) and a second diverting pulley (14), and the traction rope (12) sequentially passes through the first diverting pulley (13) and the second diverting pulley (14) and then contacts the second traction pulley (3).

2. The counter-pulling system of a steel truss girder of a suspension bridge according to claim 1, characterized in that: The bridge bank foundation (1) is provided with a first diverting pulley (13) and a second diverting pulley (14), and the traction rope (12) sequentially passes through the first diverting pulley (13) and the second diverting pulley (14) and then contacts the second traction pulley (3).

3. The counter-pulling system of a steel truss girder of a suspension bridge according to claim 2, characterized in that: The winch (11), the first diverting pulley (13), the second diverting pulley (14), the first traction pulley (21), the second traction pulley (3) and the traction rope (12) are all provided with two groups, and the distance between the two traction ropes (12) located between the portions between the second diverting pulley (14) and the second traction pulley (3) gradually decreases along the direction of the second diverting pulley (14) towards the second traction pulley (3).

4. The counter-pulling system of a steel truss girder of a suspension bridge according to claim 3, characterized in that: The distance between the two traction ropes (12) located between the portions between the first traction pulley (21) and the second traction pulley (3) gradually decreases along the direction of the first traction pulley (21) towards the second traction pulley (3).

5. The counter-pulling system of a steel truss girder of a suspension bridge according to claim 4, characterized in that: The distance between the two second traction pulleys (3) is smaller than the distance between the two first traction pulleys (21).

6. The counter-pulling system of a steel truss girder of a suspension bridge according to claim 5, characterized in that: The portion of the traction rope (12) between the first traction pulley (21) and the second traction pulley (3) is lower than the portion of the traction rope (12) between the second diverting pulley (14) and the second traction pulley (3).

7. The counter-pulling system of a steel truss girder of a suspension bridge according to claim 6, characterized in that: The second traction pulley (3) is connected with a knot, and the knot is connected with the approach bridge (2).

8. A method of end girder oscillation construction, based on the counter-pulling system of the steel truss girder of the suspension bridge according to any one of claims 1-7, characterized in that: The method comprises the following steps: S1, a bracket structure (41) is installed on the first steel truss beam (4); S2, the hook of the cable crane (6) is connected with the first steel truss beam (4), and the second traction pulley (3) is connected with the bracket structure (41); S3, the first steel truss beam (4) is lifted to a set height by the cable crane (6), and the winch (11) synchronously winds the traction rope (12) at this time; S4, then the first steel truss beam (4) is moved towards the main tower cross beam (7) by the cable crane (6), and the winch (11) synchronously winds the traction rope (12) at this time; S5, when the cable crane (6) moves to its blind area, the winch (11) winds the traction rope (12) to pull the first steel truss beam (4) to move above the cross beam; S6, then the first steel truss beam (4) is lowered by the cable crane (6), so that a section of the first steel truss beam (4) falls on the main tower cross beam (7), and the first steel truss beam (4) is connected with the main tower cross beam (7), then a permanent sling is installed on the main cable of the suspension bridge, and the permanent sling is connected with the end of the first steel truss beam (4) away from the main tower cross beam (7).

9. A method of end beam sway construction according to claim 8 wherein: The method further comprises the following steps: S7, the bracket structure (41) is removed from the first steel truss (4), and the second traction pulley (3) is removed from the bracket structure (41); S8, the girder transport vehicle transports the subsequent steel truss (5) to the approach bridge (2) close to the first steel truss (4), at this time the second traction pulley (3) is connected with the subsequent steel truss (5); S9, the girder transport vehicle continues to transport the subsequent steel truss (5) to the first steel truss (4), in the process of transportation, the winch (11) applies a counter traction force to the subsequent steel truss (5) through the traction cable (12).

10. A method of end beam sway construction according to claim 9 wherein: Further comprising the following steps: S10, after the subsequent steel truss (5) is transported to the first steel truss (4), the hook of the cable crane (6) is connected with the subsequent steel truss (5); S11, the cable crane (6) lifts the first steel truss (4) and moves to the designed position, then the cable crane (6) lowers the subsequent steel truss (5), and one end of the subsequent steel truss (5) is connected with the first steel truss (4), and the other end of the subsequent steel truss (5) is connected with the main cable of the suspension bridge through the permanent sling; S12, repeat the above steps until all the subsequent steel trusses (5) are installed.

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