Active cross-bracing device for construction of spatial cable self-anchored suspension bridge

Abstract

The utility model provides a kind of active cross bracing device for spatial cable self-anchored suspension bridge construction, including fixed unit and adjusting unit, fixed unit is fixed in suspension bridge girder one side, adjusting unit one end is connected with main cable, and the other end is connected with fixed unit.Fixed unit includes two parallelly arranged trusses, and is connected and fixed between two trusses by several flat links.Adjusting unit includes main cable clamp, tensioning piece, tensioning equipment and connecting frame, main cable clamp is used to clamp main cable, connecting frame is connected between the rear portion of two trusses, tensioning piece one end is connected with main cable clamp, and the other end is connected with tensioning equipment through connecting frame.A kind of active cross bracing device for spatial cable self-anchored suspension bridge construction of the utility model, simple structure, easy to operate;Realize the design requirement of the lateral sag of main cable, when tensioning suspender, need not set up lateral pre-bias amount for cable clamp, not only can guarantee that suspender ear plate is inserted into cable clamp ear plate smoothly, but also can avoid that suspender ear plate and cable clamp ear plate are bent, improve the service life of suspender.

Description

Technical Field

[0001] This utility model relates to the field of bridge auxiliary construction technology, specifically to an active cross bracing device for the construction of a space cable self-anchored suspension bridge. Background Technology

[0002] Space cable self-anchored suspension bridges are becoming increasingly widely used due to their unique design. Space cables possess both vertical and horizontal sag, with the suspenders exhibiting varying angles of inclination in the transverse direction. Both the main cable and suspenders of a space cable self-anchored suspension bridge possess lateral force, and the transversely inclined suspenders and stiffening girders form a stable triangle, giving it high stiffness and excellent wind resistance.

[0003] Spatial cable self-anchored suspension bridges generally adopt a "beam-first, cable-later" construction method, namely, erecting supports—erecting the main beam—erecting the main cable, anchoring both ends of the main cable to the beam ends—tensioning the suspenders—second-phase paving—removing the supports. A problem to be solved during this system conversion process is that the empty cable state after the main cable is erected is a planar cable shape, meaning it only has vertical sag and no lateral sag, which differs significantly from the spatial cable shape in the transverse direction of the completed bridge. Therefore, during the installation of the suspender clamps, the lateral inclination angle of the clamps needs to be pre-biased laterally. If the suspender lugs cannot be inserted into the clamp lugs, it will easily cause large bending at the clamp lugs and suspender lugs, reducing the service life of the suspenders. For spatial cable suspension bridges constructed using the "beam-first, cable-later" method, the current solution is to install temporary suspenders. This involves pulling the empty cable laterally outwards to make its alignment in the transverse direction close to the completed bridge alignment; then installing the suspender clamps and tensioning the suspenders; the temporary suspenders are removed after the second-phase paving. The construction process of this method is relatively complex, and the construction control is extremely difficult.

[0004] To address the aforementioned issues, invention patent (CN 104060540 B) discloses a temporary cross brace for a spatial cable suspension bridge and its hoisting construction method. However, the temporary cross brace provided by this invention requires high-altitude installation, and it suffers from drawbacks such as complex construction and inconvenient operation. Therefore, there is an urgent need to develop a novel active cross brace device for the construction of a single-tower spatial cable self-anchored suspension bridge to solve the problems existing in cable installation. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model provides an active cross bracing device for the construction of a space cable self-anchored suspension bridge.

[0006] The technical solution of this utility model is as follows: An active cross bracing device for construction of a spatial cable self-anchored suspension bridge includes a fixing unit and an adjustment unit. The fixing unit is fixed to one side of the main beam of the suspension bridge, and one end of the adjustment unit is connected to the main cable, while the other end is connected to the fixing unit.

[0007] The fixed unit consists of two parallel trusses, which are connected and fixed together by several flat couplings.

[0008] The adjustment unit includes a main cable clamp, a tensioning member, a tensioning device, and a connecting frame. The main cable clamp is used to hold the main cable. The connecting frame is connected between the rear parts of the two trusses. One end of the tensioning member is connected to the main cable clamp, and the other end passes through the connecting frame and is connected to the tensioning device.

[0009] In one embodiment, the main cable clamp adopts a clamp-style design, including two semi-circular clamps. Several first fixing seats are provided along the axial direction at the joint end of the two semi-circular clamps. The two semi-circular clamps are fastened to hold the main cable on both sides, and bolts are inserted into the first fixing seats for connection.

[0010] One or more second fixing seats are provided on the outer wall of the semi-circular clamp for connecting the tensioning element.

[0011] Preferably, a rubber pad is provided on the inner side of the semi-circular clamp to prevent damage to the main cable.

[0012] Furthermore, the second fixing seat is located at the center line of the length direction on the outer side of the semicircular clamp, and the second fixing seats on the two semicircular clamps are arranged opposite to each other.

[0013] As another implementation scheme, an arc-shaped frame is connected between two oppositely arranged second fixed seats, and a tensioning member is connected to the arc-shaped frame.

[0014] As one implementation method, the tensioning element is made of steel wire rope or steel strand.

[0015] As one implementation method, the tensioning equipment uses a through-hole jack.

[0016] In one embodiment, the connecting bracket is connected to the top rear end of the fixed unit to reduce the angle between the tensioner and the horizontal plane, making it easier to apply tension.

[0017] To facilitate the operation and adjustment of the unit, a construction platform is also connected to the top rear of the fixed unit.

[0018] Furthermore, a ladder connects one side of the construction platform to the main beam, facilitating personnel access to the construction platform.

[0019] Through the above design, this utility model provides an active cross bracing device for the construction of a spatial cable self-anchored suspension bridge. It has a simple structure and is easy to operate. It achieves the design requirements for the lateral sag of the main cable. When tensioning the suspenders, there is no need to set a lateral pre-offset for the suspender cable clamps. This not only ensures that the suspender cable ear plates can be smoothly inserted into the cable clamp ear plates, but also avoids bending between the suspender cable ear plates and the cable clamp ear plates, thereby improving the service life of the suspenders. Attached Figure Description

[0020] In the attached diagram: Figure 1 This is a construction status diagram of the active cross bracing device; Figure 2 This is a side view of the ladder location; Figure 3 Front view of the main cable status changes; Figure 4 Top view of the main cable status changes; Figure 5 This is a schematic diagram of the connecting frame structure; Figure 6 This is a schematic diagram of the main cable clamp structure in Example 1; Figure 7 for Figure 6 Side view; Figure 8 This is a schematic diagram of the main cable clamp structure in Example 2; The components represented by the various reference numerals in the diagram are: 1. Fixed unit; 11. Truss; 12. Flat connector; 13. Construction platform; 14. Ladder; 2. Adjustment unit; 21. Semicircular clamp; 22. First fixed seat; 23. Second fixed seat; 24. Wire rope; 25. Through-hole jack; 26. Connecting frame; 27. Rubber pad; 28. Arc frame; 3. Main beam; 4. Guardrail; 5. Cable clamp; 6. Lifting cable. Detailed Implementation

[0021] Example 1 See Figures 1-5 This embodiment provides an active cross bracing device for the construction of a spatial cable self-anchored suspension bridge, including a fixing unit 1 and an adjustment unit 2. The fixing unit 1 is fixed on one side of the main beam 3 of the suspension bridge, and one end of the adjustment unit 2 is connected to the main cable, while the other end is connected to the fixing unit 1.

[0022] The fixed unit 1 includes two parallel trusses 11, which are connected and fixed by a number of flat couplings 12.

[0023] Specifically, the truss 11 stands vertically at the end of the main beam 3. Each truss 1 consists of upper and lower chords, web members, and diagonal legs. The upper and lower chords are located outside the guardrail 4 and extend outward from the end of the main beam 3. The diagonal legs extend inward toward the main beam 3. In this way, while ensuring that the truss 11 is fixedly connected to the main beam, the main stress point at the top is placed on the outside, increasing the distance between it and the main cable, which facilitates the operation of the adjustment unit 2.

[0024] Truss 11 is bolted to main beam 3, which makes it easy to dismantle after the active cross bracing device is used.

[0025] In this embodiment, the flat connector 12 is an "I"-shaped structure with two channel steels arranged back to back, and is placed in places where reinforcement is needed, such as web members and diagonal legs, and the number is unlimited.

[0026] See Figure 6 and Figure 7 The adjustment unit 2 includes a main cable clamp, a tensioning member, a tensioning device, and a connecting frame 26. The main cable clamp is used to hold the main cable. The connecting frame 26 is connected between the rear parts of the two trusses 11. One end of the tensioning member is connected to the main cable clamp, and the other end passes through the connecting frame 26 and is connected to the tensioning device.

[0027] See Figure 1 and Figure 3 A cable clamp 5 is installed on the outside of the main cable, and an adjustment unit 2 is set on one or both sides of the cable clamp 5. Suspension cables 6 are installed on both sides of the main beam 3. By pulling the tensioning device, the tensioning member is pulled, thereby causing the main cable clamp to move the main cable held inside it outwards. Figure 3 and Figure 4 As shown, until reaching the designated position, it successfully connects with the sling 6 ear plate.

[0028] In one embodiment, the main cable clamp adopts a clamp style, including two semi-circular clamps 21. Several first fixing seats 22 are arranged along the axial direction at the joint end of the two semi-circular clamps 21. The two semi-circular clamps 21 are fastened to hold the two sides of the main cable, and bolts are inserted into the first fixing seats 22 for connection.

[0029] Preferably, a rubber pad 27 with a thickness of 2-3 cm is provided on the inner side of the semi-circular clamp 21 to prevent damage to the main cable.

[0030] To better distribute the force, in this embodiment, two second fixing seats 23 are provided at the same position on the outer wall of each semicircular clamp 21 for connecting the tensioning member.

[0031] Preferably, the second fixing seat 23 is located at the center line of the length direction on the outer side of the semicircular clamp 21, and the second fixing seats 23 on the two semicircular clamps 21 are arranged opposite to each other.

[0032] The second fixing seat 23 includes a first connecting plate parallel to the axis of the semi-circular clamp 21, with a connecting hole for connecting a tensioning member, and a second connecting plate arranged perpendicular to both sides of the first connecting plate, with the connecting hole spaced between the two second connecting plates.

[0033] Preferably, both the second fixing seat 23 and the first fixing seat 22 are welded to the outside of the semi-circular clamp 21, and the second fixing seat 23 and the first fixing seat 22 are arranged at intervals. After the main cable clamp is clamped onto the main cable, the second fixing seats 23 on the two semi-circular clamps 21 are arranged vertically to facilitate the connection between the tensioning member and the fixing unit 1.

[0034] As one embodiment, the tensioning member is made of wire rope 24 or steel strand. This embodiment will be described using wire rope 24 as an example.

[0035] As one implementation method, the tensioning equipment uses a 25mm through-hole jack.

[0036] In one embodiment, the connecting frame 26 is connected to the top rear end of the fixing unit 1 to reduce the angle between the wire rope 24 and the horizontal plane, making it easier to apply tension.

[0037] In this embodiment, the connecting frame 26 includes two sets, which are arranged vertically and horizontally on the rear side of the top of the web of the two trusses 11, corresponding to the two sets of second fixing seats 23 arranged vertically on the main cable clamp, which facilitates the arrangement of multiple wire ropes 24 without interference between them.

[0038] See Figure 5 Each set of connecting frames 26 includes two parallel I-beams arranged vertically, with a space in between for a steel wire rope 24 to pass through. Several reinforcing ribs are attached to the location where the steel wire rope 24 passes through. Both sets of connecting frames 26 also increase the strength of this area by adding reinforcing ribs.

[0039] In this embodiment, the through-hole jack 25 is suspended and its installation position is adjusted by an electric hoist, and an installation frame is added at an appropriate position at the rear of the fixing unit 1.

[0040] Example 2 See Figure 8 As an alternative implementation, to reduce the number of wire ropes 24, an arc-shaped frame 28 is bolted between two oppositely arranged second fixed seats 23, and the wire rope 24 is connected to the arc-shaped frame 28. This reduces the number of connecting frames 26 and through-hole jacks 25, further simplifying the structure. However, the dimensions of the wire rope 24 need to be adjusted accordingly.

[0041] Example 3 See Figure 1 and Figure 2 To facilitate the operation of the adjustment unit 2, especially the operation of the through-hole jack 25, a construction platform 13 is also connected to the rear of the top of the fixed unit 1. A ladder 14 is connected between one side of the construction platform 13 and the main beam to facilitate personnel to go up to the construction platform 13 for work.

Claims

1. An active cross bracing device for construction of a space cable self-anchored suspension bridge, characterized in that, It includes a fixing unit (1) and an adjustment unit (2). The fixing unit (1) is fixed on one side of the main beam (3) of the suspension bridge. One end of the adjustment unit (2) is connected to the main cable, and the other end is connected to the fixing unit (1). The fixed unit (1) includes two parallel trusses (11), which are connected and fixed by a number of flat couplings (12); The adjustment unit (2) includes a main cable clamp, a tensioning member, a tensioning device, and a connecting frame (26). The main cable clamp is used to hold the main cable. The connecting frame (26) is connected between the rear parts of the two trusses (11). One end of the tensioning member is connected to the main cable clamp, and the other end passes through the connecting frame (26) and is connected to the tensioning device.

2. The active cross bracing device according to claim 1, characterized in that, The main cable clamp includes two semi-circular clamps (21), and several first fixing seats (22) are provided at the joint end of the two semi-circular clamps (21) along the axial direction. The two semi-circular clamps (21) are fastened to hold the main cable on both sides. One or more second fixing seats (23) are provided on the outer wall of the semi-circular clamp (21) for connecting the tensioning member.

3. The active cross bracing device according to claim 2, characterized in that, A rubber pad (27) is provided on the inner side of the semi-circular clamp (21).

4. The active cross bracing device according to claim 3, characterized in that, The second fixing seat (23) is located at the center line of the length direction outside the semicircular clamp (21), and the second fixing seats (23) on the two semicircular clamps (21) are arranged opposite to each other.

5. The active cross bracing device according to claim 4, characterized in that, An arc-shaped frame (28) is connected between two opposing second fixed seats (23), and the tensioning member is connected to the arc-shaped frame (28).

6. The active cross bracing device according to any one of claims 1-5, characterized in that, The tensioning element is made of steel wire rope (24) or steel strand.

7. The active cross bracing device according to claim 6, characterized in that, The tensioning equipment uses a through-hole jack (25).

8. The active cross bracing device according to claim 7, characterized in that, The connecting frame (26) is connected to the top rear end of the fixed unit (1).

9. The active cross bracing device according to claim 8, characterized in that, A construction platform (13) is also connected to the rear of the top of the fixed unit (1).

10. The active cross bracing device according to claim 9, characterized in that, A ladder (14) is connected between one side of the construction platform (13) and the main beam (3).

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