Multi-strand self-correction connection anchorage anchoring structure for main cable of suspension bridge

Abstract

The utility model relates to a suspension bridge main cable multi-strand self-correcting connecting anchorage anchoring structure which comprises a main cable strand, a main cable connecting system and a prestressing tendon anchorage system, the main cable strand comprises N main cables and metal anchor cups, the number of the main cables is larger than or equal to 2, the main cable connecting system comprises a connecting pull rod and a connector, the prestressing tendon anchorage system is connected with the connector, and the metal anchor cups are connected with the connecting pull rod. The connector is provided with a pull rod through hole for the connecting pull rod to penetrate through, the connecting pull rod penetrates through the pull rod through hole to be connected with the metal anchor cup and the connector, the connector is a deviation rectifying connector with the pull rod through hole being an inclined hole, and an included angle beta is formed between the central axis of the pull rod through hole and the vertical line and ranges from 0.5 degree to 6 degrees. According to the utility model, the deviation rectifying connector is adopted, and the pull rod through hole for mounting the connecting pull rod in the deviation rectifying connector is the inclined hole, so that a divergence angle caused by a plurality of cable strands in divergent distribution can be counteracted, a deflection angle cannot be generated between the connecting pull rod and the connector, the connecting pull rod always keeps axial stress, and the service life can be prolonged.

Description

Technical Field

[0001] This utility model relates to an anchorage structure for a suspension bridge, and particularly to a self-correcting connection anchorage structure for a multi-strand main cable of a suspension bridge. Background Technology

[0002] In existing suspension bridges, after the main cables are anchored with multiple strands, the upper ends of the multiple main cables converge at a single point, meaning the main cables are distributed divergently. When there are ≥2 main cables, a divergence angle will appear, such as... Figure 1 As shown, the angle formed between the central axis of the main cable and the vertical line is the divergence angle α. The existing multi-strand anchorage structure of the main cable of the suspension bridge uses two connecting rods to connect one main cable. That is, one main cable and two connecting rods are installed on a metal anchor cup, and the connecting rods are then installed on a connector. The connector is connected to the prestressed tendon anchorage system. This structure has the following shortcomings:

[0003] 1. The connector's tie rod through hole is a vertical hole, which is only applicable to single strands. However, when there are ≥2 strands, the tie rod is installed using a connector with a vertical hole. Since the tie rod and the central axis of the main cable it is connected to are parallel, and the main cable has a divergence angle, the tie rod also needs to be installed at an angle according to the divergence angle of the main cable in order to make the main cable diverge. This will cause the tie rod and the vertical hole of the connector to be at an angle. The existence of the angle will generate fretting friction, which will change the stress state of the tie rod from axial tension to bending stress, increasing the risk of breakage.

[0004] 2. The upper part of the working anchor plate has no anti-loosening device with clamps, which poses a risk of slippage due to the clamps failing to hold the steel strand.

[0005] 3. The connection between the connector and the connecting rod is not protected. The connection between the connecting rod and the connector is rigid, which is prone to wear and rainwater can easily enter the connector and cause the connecting rod to rust. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a self-correcting connection anchorage structure for the main cable of a suspension bridge with multiple strands. This structure adopts a correction connector, in which the through hole for installing the connecting rod is an oblique hole, which can offset the divergence angle caused by the divergent distribution of multiple strands, so that the connecting rod always maintains axial force and reduces the risk of breakage.

[0007] The technical solution to the above-mentioned technical problems is: a self-correcting connection anchorage structure for a multi-strand main cable of a suspension bridge, comprising main cable strands, a main cable connection system, and a prestressed tendon anchorage system. The main cable strands include main cables and metal anchor cups, and the number of main cables is N, where N≥2. The main cable connection system includes connecting rods and connectors. The prestressed tendon anchorage system is connected to the connectors. The connectors have through holes for the connecting rods to pass through. The connecting rods pass through the through holes and connect the metal anchor cups and the connectors. The connectors are self-correcting connectors with oblique through holes.

[0008] Furthermore, the lower end face of the alignment connector includes a central horizontal end face and an outer edge end face. The pull rod through hole is opened on the outer edge end face. The outer edge end face is set as an inclined surface with the inner side higher than the outer side. The included angle γ formed by the outer edge end face of the alignment connector and the central axis of the pull rod through hole is 84 to 92°.

[0009] Furthermore, the central axis of the pull rod through hole forms an angle β with the vertical line, and the angle β is 0.5 to 6°.

[0010] Furthermore, the included angle β is 1 to 3°.

[0011] Furthermore, a nylon anti-damage sleeve is provided between the connecting rod and the rod through hole of the correction connector, and a sealing rubber is provided between the connecting rod and the upper end of the rod through hole.

[0012] Furthermore, the prestressed tendon anchoring system includes steel strands and working anchor plates installed at both ends of the steel strands. Working clamps are provided between the steel strands and the working anchor plates. Disc springs are also installed on the steel strands outside the working clamps. The disc springs are pressed by anti-loosening pressure plates, which are connected to the working anchor plates.

[0013] Furthermore, a steel strand conduit is provided outside the steel strand, and pre-embedded pipes and steel pads are sequentially provided at both ends of the steel strand conduit, with a secondary pressure-bearing plate provided on the pre-embedded pipe.

[0014] Furthermore, from the bottom view, the shape of the alignment connector is a 2N-sided polygon with straight sides or a 2N-sided polygon with two straight sides connected by arc edges.

[0015] By adopting the above technical solution, this utility model has the following beneficial effects:

[0016] 1. The connector used in this utility model is a correction connector with an oblique hole for the pull rod through hole. After the pull rod is installed using this correction connector, the divergence angle caused by the divergent distribution of multiple strands can be offset, so that there will be no deflection angle between the pull rod and the connector. The pull rod always maintains axial force and does not need to bear bending stress, which can extend the service life.

[0017] 2. A nylon anti-damage sleeve is installed between the connector and the connecting rod of this utility model to avoid hard contact between the connecting rod and the connector and eliminate stress concentration; in addition, by setting a sealing rubber at the upper end of the through hole of the rod, it can effectively prevent rainwater erosion and prevent the connecting rod inside the through hole of the rod from rusting.

[0018] 3. This utility model adds an anti-loosening pressure plate and a disc spring to the upper end of the anchor clamp. After tensioning is completed, tighten the clamping screw on the anti-loosening pressure plate to apply bolt force to the anti-loosening pressure plate, so that the disc spring in the corresponding hole of the anti-loosening pressure plate always presses the working clamp, eliminating the risk of slippage due to the clamp failing to bite the steel strand.

[0019] 4. The steel pads in the front and rear anchor components of this utility model are made of low alloy structural steel, which has strong compressive, shear and bending resistance and is not easily damaged during transportation and construction. A secondary pressure plate is also provided to effectively disperse the stress transmission under the anchor in the anchoring area and further ensure operational safety.

[0020] 5. The alignment connector of this utility model can adopt a polygonal structure with two straight sides connected by an arc edge. While having the same function, it can reduce weight, meeting the customer's expectation of lightweighting; the increased machining amount can be used to sell scrap materials, reducing costs and meeting the principle of economy.

[0021] The technical features of a multi-strand self-correcting connection anchorage structure for the main cable of a suspension bridge according to the present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1 : Schematic diagram of the self-correcting connection anchorage structure of the main cable of the suspension bridge according to this utility model.

[0023] Figure 2 : Figure 1 Enlarged view of part A.

[0024] Figure 3 : Figure 1 Enlarged view of part B.

[0025] Figure 4 : Front view of the main cable strand and main cable connection system of this utility model.

[0026] Figure 5 Bottom view of the main cable strands and main cable connection system of this utility model.

[0027] Figure 6 Top view of the main cable strands and main cable connection system of this utility model.

[0028] Figure 7 : A bottom view (circular) of the alignment connector of this utility model.

[0029] Figure 8 : Figure 7 CC section view.

[0030] Figure 9 The bottom view of the web-correcting connector of this utility model (with eight pull rod through holes, the web-correcting connector is an octagon with two straight sides connected by an arc edge).

[0031] Figure 10 :according to Figure 9 A schematic diagram of the structure of the correction connector with two connecting rods installed, viewed in cross section at the DD position.

[0032] Figure 11 The bottom view of the correction connector of this utility model (with six pull rod through holes, the correction connector is a hexagon with two straight sides connected by an arc edge).

[0033] Figure 12 The bottom view of the web alignment connector of this utility model (with four pull rod through holes, the web alignment connector is rectangular).

[0034] Figure 13 : A bottom view of a connector with a vertical through hole for the existing pull rod.

[0035] Figure 14 :according to Figure 13 A schematic diagram of the existing connector with two connecting rods installed, viewed in cross-section at the EE position.

[0036] In the diagram: 1-Main cable, 2-Locking nut, 3-Spherical hinge nut, 4-Spherical hinge washer, 5-Metal anchor cup, 6-Connecting rod, 7-Disc spring, 8-Sealing rubber, 9-Nylon anti-damage sleeve, 10-Correction connector, 101-Rod through hole, 102-Middle horizontal end face, 103-Outer edge end face, 11-Support cylinder, 12-Steel pad, 13-Anchor reinforcing rib, 14-Secondary bearing plate, 15-Embedded pipe, 16-Steel strand, 17-Working anchor plate, 18-Working clamp, 19-Protective cover, 20-Anti-loosening pressure plate, 21-Steel strand conduit. Detailed Implementation

[0037] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0038] Example 1: A self-correcting anchorage structure for multi-strand main cables of a suspension bridge, such as... Figures 1-12As shown, the system includes a main cable strand, a main cable connection system, and a prestressed tendon anchoring system. The main cable strand includes a main cable 1 and a metal anchor cup 5. The main cable connection system includes connecting rods 6 and connectors. The prestressed tendon anchoring system is connected to the connector. The connector has a through hole 101 for the connecting rod to pass through. The connector is a correction connector 10 with an angled through hole 101. The through hole 101 is inclined towards the center of the correction connector, i.e., the central axis of the through hole 101 forms an angle β with the vertical line, where the angle β is 1 to 3°. One main cable 1 and two connecting rods 6 are connected by a metal anchor cup 5. The two ends of the connecting rod 6 are fixed to the metal anchor cup 5 and the connector 10 respectively by nut assemblies. The bottom end of the connecting rod 10 passes through the rod through hole 101 of the alignment connector 10. Because the rod through hole 101 is an oblique hole, the connecting rod connected to the same metal anchor cup has the same divergence angle as the main cable, so that there will be no deflection angle between the connecting rod and the alignment connector, and the axial force is always maintained without having to bear bending stress.

[0039] As a variation of this embodiment, the included angle β can also be adjusted according to the actual situation, and the included angle β is generally 0.5 to 6°.

[0040] In this embodiment, the lower end face of the alignment connector 10 includes a central horizontal end face 102 and an outer edge end face 103. The central horizontal end face 102 is used to connect with the support cylinder 11. The pull rod through hole 101 is formed on the outer edge end face. The outer edge end face 103 is set as an inclined surface with a higher inner surface and a lower outer surface. The included angle γ formed by the outer edge end face of the alignment connector and the central axis of the pull rod through hole is 84-92°, preferably 90°, which facilitates the installation of the nut assembly. As a variation, the outer edge end face 103 can also be set as a horizontal end face, and the contact surface between the nut assembly and the outer edge end face is set as an inclined surface.

[0041] The nut assembly described in this embodiment includes a locking nut 2, a ball joint nut 3, and a ball joint washer 4. As a variation, the components of the nut assembly can be determined according to the actual situation.

[0042] In this embodiment, a nylon anti-damage sleeve 9 is provided between the connecting rod 6 and the rod through hole 101 of the correction connector 10, and a sealing rubber 8 is provided between the connecting rod 6 and the upper end of the rod through hole 101, such as... Figure 2 As shown. The nylon anti-damage sleeve 9 can prevent the connecting rod 6 from being rigidly connected to the correction connector 10, and the sealing rubber 8 can prevent rainwater from entering the rod through hole 101 and corroding the connecting rod 6.

[0043] In this embodiment, the prestressed tendon anchorage system includes steel strands 16 and working anchor plates 17 installed at both ends of the steel strands. The steel strands are unbonded steel strands. Working clamps 18 are provided between the ends of the steel strands 16 and the working anchor plates 17. Disc springs 7 are also installed on the steel strands outside the working clamps 18. The disc springs are pressed by anti-loosening pressure plates 20. The anti-loosening pressure plates 20 are connected to the working anchor plates 17 by bolts. Figure 3 As shown. This ensures that the disc spring 7 corresponding to the hole of the anti-loosening pressure plate 20 always presses the working clamp 18 tightly, eliminating the risk of slippage due to the clamp failing to grip the steel strand.

[0044] In this embodiment, a steel strand conduit 21 is provided outside the steel strand 16. From the inside out, pre-embedded pipes 15 and steel pads 12 are sequentially arranged at both ends of the steel strand conduit. A secondary pressure-bearing plate 14 is provided on the pre-embedded pipe 15. The steel pad 12 is made of low-alloy structural steel, which has strong compressive, shear, and bending resistance, and is not easily damaged during transportation and construction. The secondary pressure-bearing plate 14 effectively disperses the stress transfer under the anchor in the anchorage zone, ensuring operational safety.

[0045] In this embodiment, the number of main cables N is 2, 3 or 4. As a variation, the number of main cables N can also be 5 or 6, and generally 2≤N≤10.

[0046] In this embodiment, viewed from the bottom view, the shape of the alignment connector 10 is a conventional 2N-sided polygon with straight sides or a 2N-sided polygon with two straight sides connected by an arc edge. For example, when the number of main cables is 3, the shape of the alignment connector 10 is a conventional hexagon or a hexagon with two straight sides connected by an arc edge (e.g., Figure 11 (As shown). When the number of main cables is 4, the shape of the correction connector 10 is a conventional octagon or an octagon with two straight sides connected by an arc edge (as shown). Figure 9 (As shown). As a variation, the shape of the correction connector 10 can also be a conventional circle.

[0047] Components whose structure and connection method are not specifically described in this utility model are the same as those in the prior art and will not be described in detail here.

Claims

1. A self-correcting anchorage structure for a multi-strand main cable of a suspension bridge, comprising main cable strands, a main cable connection system, and a prestressed tendon anchorage system, wherein the main cable strands include a main cable (1) and a metal anchor cup (5), the number of main cables is N, N≥2, the main cable connection system includes a connecting rod (6) and a connector, the prestressed tendon anchorage system is connected to the connector, the connector has a rod through hole (101) for the connecting rod to pass through, the connecting rod passes through the rod through hole and connects the metal anchor cup and the connector, characterized in that: The connector is a correction connector (10) with an oblique hole for the pull rod through hole (101).

2. The self-correcting anchorage structure for multi-strand main cable of a suspension bridge according to claim 1, characterized in that: The lower end face of the alignment connector includes a central horizontal end face (102) and an outer edge end face (103). The pull rod through hole is opened on the outer edge end face. The outer edge end face is set as an inclined surface with the inner side higher than the outer side. The included angle γ formed by the outer edge end face of the alignment connector and the central axis of the pull rod through hole is 84 to 92°.

3. The self-correcting anchorage structure for multi-strand main cable of a suspension bridge according to claim 1 or 2, characterized in that: The central axis of the pull rod through hole forms an angle β with the vertical line, and the angle β is 0.5 to 6°.

4. The self-correcting anchorage structure for multi-strand main cable of a suspension bridge according to claim 3, characterized in that: The included angle β is 1 to 3°.

5. The self-correcting anchorage structure for multi-strand main cable of a suspension bridge according to claim 1 or 2, characterized in that: A nylon anti-damage sleeve (9) is provided between the connecting rod and the rod through hole of the correction connector, and a sealing rubber (8) is provided between the connecting rod and the upper end of the rod through hole.

6. The self-correcting anchorage structure for multi-strand main cable of a suspension bridge according to claim 1 or 2, characterized in that: The prestressed tendon anchor system includes a steel strand (16) and working anchor plates (17) installed at both ends of the steel strand. A working clamp (18) is provided between the steel strand and the working anchor plate. A disc spring (7) is also installed on the steel strand outside the working clamp. The disc spring is pressed by an anti-loosening pressure plate (20), which is connected to the working anchor plate.

7. The self-correcting anchorage structure for multi-strand main cable of a suspension bridge according to claim 6, characterized in that: The steel strand is provided with a steel strand pipe (21), and the two ends of the steel strand pipe are provided with a pre-embedded pipe (15) and a steel pad (12) in sequence. A secondary pressure plate (14) is provided on the pre-embedded pipe.

8. The self-correcting anchorage structure for multi-strand main cable of a suspension bridge according to claim 1 or 2, characterized in that: From the bottom view, the shape of the correction connector (10) is a 2N polygon with straight sides or a 2N polygon with two straight sides connected by arc edges.

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