Multi-strand anchoring unit structure for main cable of suspension bridge

Abstract

The utility model relates to a suspension bridge main cable multi-strand anchoring unit structure which comprises a hot casting anchor head, main cables, a prestressing tendon anchorage assembly and a pull rod connecting assembly, the number N of the main cables is larger than or equal to 2, the main cables are connected with the hot casting anchor head, the pull rod connecting assembly comprises an anchor backing plate and N sets of pull rod assemblies, and the prestressing tendon anchorage assembly is connected with the anchor backing plate. N mounting plates are arranged on the anchor bearing plate, each pull rod connecting assembly comprises two pull rods and a fork lug assembly, each fork lug assembly comprises a single fork lug and a double fork lug, the upper portions of the pull rods are mounted on the hot casting anchor head, the lower ends of the pull rods are connected with the single fork lugs, the single fork lugs are connected with the double fork lugs through first pin shafts, and the double fork lugs are mounted on the mounting plates through second pin shafts. The included angle formed by the first pin shaft and the second pin shaft is 90 + / -5 degrees. According to the pull rod of the structure, the fork lug assembly composed of the single fork lug and the double fork lugs is connected with the anchor bearing plate, the stress direction of each pull rod can be automatically adjusted in the X-axis direction and the Y-axis direction at the same time, automatic adjustment of the anchoring angle is achieved, and installation and construction are convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of anchoring structure of main cable of suspension bridge, in particular to a kind of suspension bridge main cable multi-cable anchoring unit structure. BACKGROUND

[0002] Suspension bridge is one of the main forms of super-long span bridge, and at present, most of the bridges with span more than 1000m in the world are suspension bridges. If carbon fiber with light weight and high strength is used as main cable of suspension bridge, the ultimate span can be more than 8000m in theory. The construction of modern suspension bridge in China started in the 1960s, and has been developed for nearly 60 years. All technologies are gradually mature. The main cable anchoring structure is one of the most important anchoring structures, and the reliability and stability of anchoring are important factors to determine the carrying capacity and service life of the bridge. How to evenly distribute the load of the main cable to each anchoring point and balance the stress of each anchoring point to improve the overall stability is an important factor to be considered in the design of the main cable anchoring structure.

[0003] In order to evenly distribute the load of the main cable to each anchoring point, the anchoring structure of each anchoring point of the main cable is the key. In the existing suspension bridge main cable multi-cable anchoring unit structure, the main cable cable connection part is fixedly connected with the connector and the pull rod, the pull rod cannot rotate and swing relative to the connector, and the angle deviation between the main cable and the anchoring point cannot be corrected, so the installation and construction are difficult. Another patent discloses a connector structure for main cable anchoring, which includes a bottom plate and a side plate. The pull rod assembly is connected with the side plate through a fork ear and a pin shaft, and the angle is adjusted by rotating the bottom plate and rotating the pull rod assembly around the pin shaft. Although this structure can adjust the stress direction of the pull rod assembly, it is connected with the pull rod assembly by a single fork ear, and only one direction of stress can be adjusted. The rotation of the bottom plate is in the circumferential direction, and the bottom plate is connected with all pull rods. The angle adjustment is limited by all pull rods, and it is difficult to ensure that the stress of each pull rod in the X-axis and Y-axis directions is adjusted at the same time. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to provide a suspension bridge main cable multi-cable anchoring unit structure. The pull rod of the structure is connected with the anchor pad by a fork ear assembly composed of a single fork ear and a double fork ear. Each pull rod can automatically adjust the stress direction in the X-axis and Y-axis directions at the same time, realize automatic adjustment of the anchoring angle, and the installation and construction are convenient.

[0005] The technical scheme for solving the above technical problems is as follows: a main cable multi-cable strand anchoring unit structure of a suspension bridge, comprising a hot-cast anchor head, a main cable, a prestressed beam anchorage component and a pull rod connecting component, the number of the main cable is N, N≥2, the main cable is connected with the hot-cast anchor head, the pull rod connecting component comprises an anchor pad and N groups of pull rod components, the prestressed beam anchorage component is connected with the anchor pad, N anchor pads are arranged on the anchor pad, each group of pull rod connecting components comprises two pull rods and two groups of fork ear components for connecting the pull rods and the anchor pads, the fork ear components comprise single fork ears and double fork ears, the upper parts of the pull rods are arranged on the hot-cast anchor head, the lower ends of the pull rods are connected with the single fork ears, the single fork ears are connected with the double fork ears through a pin shaft one, the double fork ears are arranged on the anchor pads through a pin shaft two, and the included angle formed by the central axes of the pin shaft one and the pin shaft two is 90±5°.

[0006] Further, two pin shaft baffle plates are respectively arranged on the double fork ears in a detachable mode, grooves are formed in the pin shaft one and the pin shaft two, and the two pin shaft baffle plates are respectively arranged in the grooves of the pin shaft one and the pin shaft two.

[0007] Further, when N=2, the N anchor pads are arranged in parallel on the anchor pad; and when N>2, the N anchor pads are arranged on the anchor pad according to the angles of a regular N polygon.

[0008] Further, the number N of the main cable is 2≤N≤8.

[0009] Further, the included angle formed by the central axes of the pin shaft one and the pin shaft two is 90°.

[0010] Due to the adoption of the above technical scheme, the utility model has the following beneficial effects:

[0011] 1. Anchoring angle is automatically adjusted. The pull rod and the anchor pad are connected through two fork ears (one single fork ear and one double fork ear) and the anchor pad, the double fork ear is a cross double-end fork ear, the pin shaft holes at the upper and lower ends of the double fork ear are arranged in a 90° cross mode, the pin shaft one and the pin shaft two arranged at the upper and lower ends of the double fork ear are in a vertical state, each pull rod can rotate around the pin shaft one and the pin shaft two, that is, the force direction can be automatically adjusted in the X-axis and Y-axis directions at the same time, the pull rod has the characteristics of rotating and swinging in two directions along the axis at any angle, and can be used for correcting the angle deviation between the main cable and the anchoring point and eliminating the torsional moment.

[0012] 2. The installation and replacement are convenient. Since the pull rod has the function of automatically adjusting the angle, the installation angle does not need to be considered during installation and replacement, so the installation and replacement operation is more convenient and fast.

[0013] 3. The pull rod component can be separately packaged and delivered in the factory, or can be installed on site, and the delivery form can be selected according to the installation site, and the operation is flexible.

[0014] The technical features of a multi-strand anchorage unit 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

[0015] Figure 1 : A front view of a multi-strand anchorage unit structure for the main cable of a suspension bridge (two main cables) according to Embodiment 1 of this utility model.

[0016] Figure 2 : Figure 1 The left view.

[0017] Figure 3 : A top view of a multi-strand anchorage unit structure for the main cable of a suspension bridge (two main cables) according to Embodiment 1 of this utility model.

[0018] Figure 4 : Figure 3 The left view.

[0019] Figure 5 : A perspective view of the tie rod connection assembly with hot-cast anchor cup installed in Embodiment 1 of this utility model (two main cables).

[0020] Figure 6 : A schematic diagram of a multi-strand anchorage unit structure for the main cable of a suspension bridge (the main cable consists of 3 strands) according to Embodiment 2 of this utility model.

[0021] Figure 7 : Figure 6 The left view.

[0022] Figure 8 : A schematic diagram of a multi-strand anchorage unit structure for the main cable of a suspension bridge (the main cable consists of 4 strands) according to Embodiment 3 of this utility model.

[0023] Figure 9 : Figure 8 The left view.

[0024] In the diagram: 1-Tie rod, 2-Hot-cast anchor head, 3-Anti-loosening nut, 4-Fixing nut, 5-Washer, 6-Single fork lug, 7-Pin shaft one, 8-Double fork lug, 9-Pin shaft two, 10-Anchor plate, 11-Pin shaft baffle, 12-Mounting plate, 13-Prestressed tendon anchor assembly, 14-Main cable. Detailed Implementation

[0025] 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.

[0026] Example 1: A multi-strand anchorage unit structure for the main cable of a suspension bridge, such as... Figures 1-5 As shown, the system includes a hot-cast anchor head 2, a main cable 14, a prestressed tendon anchor assembly 13, and a tie rod connection assembly. The number of main cables is N, where N=2. The main cable 14 is connected to the hot-cast anchor head 2. The tie rod connection assembly includes an anchor plate 10 and N sets of tie rod assemblies. The prestressed tendon anchor assembly 13 is connected to the anchor plate 10. Two parallel mounting plates 12 are provided on the anchor plate 10. Each tie rod connection assembly includes two tie rods 1 and two sets of fork lug assemblies for connecting the tie rods 1 and the mounting plates 12. The fork lug assemblies include single fork lugs 6 and double fork lugs. 8. The double-forked lug is a cross-shaped double-headed forked lug, characterized by the pin holes at both ends of the double-forked lug being arranged at 90° angles. The upper part of the tie rod 1 is mounted on the hot-cast anchor head 2 via a nut assembly, and the lower end of the tie rod is connected to the single-forked lug 6 via a nut assembly. The single-forked lug 6 is connected to the double-forked lug 8 via pin 7. The double-forked lug 8 is mounted on the mounting plate 12 on the anchor plate 10 via pin 9. Pin 7 is located in the pin hole at the upper end of the double-forked lug 8, and pin 9 is located in the pin hole at the lower end of the double-forked lug 8. The central axis of pin 7 and the central axis of pin 9 form an angle of 90°. The tie rod can rotate around pin 7 and pin 9 respectively, that is, it can automatically adjust the force direction in the X and Y axes simultaneously to correct the angular deviation between the main cable strands and the anchor points.

[0027] In this embodiment, each set of double-forked lugs 8 is fitted with two pin baffles 11 by screws. Pin 1 7 and pin 2 9 have grooves, and the two pin baffles 8 are located within the grooves of pin 1 and pin 2, respectively. The purpose of the pin baffles 8 is to prevent pin 1 7 and pin 2 9 from coming out. As a variation of this embodiment, other detachable methods can be used to install the pin baffles; or the pin baffles can be omitted.

[0028] As a variation of this embodiment, the angle formed by the central axis of pin 7 and the central axis of pin 9 can be adjusted according to the actual situation, generally 90±5°.

[0029] Example 2: A multi-strand anchorage unit structure for the main cable of a suspension bridge, such as... Figures 6-7 As shown, its basic structure is the same as that of Embodiment 1, except that: the number of main cables is 3, and 3 mounting plates 12 are provided on the anchor plate 10. The 3 mounting plates 12 are arranged on the anchor plate 10 in the form of a regular triangle (equilateral triangle), that is, the included angle between two adjacent mounting plates 12 is 60°.

[0030] Example 3: A multi-strand anchorage unit structure for the main cable of a suspension bridge, such as... Figures 8-9As shown in the figure, the basic structure is the same as that of Embodiment 1, except that the number of the main cables is 4, and the anchor base plate 10 is provided with 4 mounting plates 12, which are arranged on the anchor base plate 10 in a regular quadrilateral (square) shape, i.e., the included angle between two adjacent mounting plates 12 is 90°.

[0031] As a variation of each embodiment, the number N of the main cables can also be 5 or 6, and generally the number N of the main cables is 2≤N≤8.

[0032] In this embodiment, the nut assembly is composed of a lock nut 3, a fixing nut 4 and a gasket 5.

[0033] The components of the structure and the connection mode are not specifically described in the utility model, which are the same as the prior art, and will not be described here.

Claims

1. A multi-cable strand anchorage unit structure of a main cable of a suspension bridge, comprising a hot-cast anchor head (2), a main cable (14), a pre-stressed beam anchorage assembly (13) and a pull rod connecting assembly, the number of the main cables is N, N≥2, the main cables are connected with the hot-cast anchor head, characterized in that: The pull rod connecting assembly comprises an anchor pad (10) and N groups of pull rod assemblies, the prestressed beam anchorage assembly (13) is connected with the anchor pad, N mounting plates (12) are arranged on the anchor pad, each group of pull rod connecting assemblies comprises two pull rods (1) and two groups of forked ear assemblies for connecting the pull rods and the mounting plates, the forked ear assemblies comprise single forked ears (6) and double forked ears (8), the upper portions of the pull rods are mounted on hot cast anchor heads, the lower ends of the pull rods are connected with the single forked ears, the single forked ears are connected with the double forked ears through pin shafts I (7), the double forked ears are mounted on the mounting plates (12) on the anchor pad through pin shafts II (9), and the included angle formed by the central axes of the pin shafts I and the pin shafts II is 90±5°.

2. The multi-cable anchorage unit structure of a suspension bridge main cable according to claim 1, characterized in that: Two pin shaft baffle plates (11) are detachably mounted on the double forked ears respectively, grooves are formed in the pin shafts I and the pin shafts II, and the two pin shaft baffle plates are located in the grooves of the pin shafts I and the pin shafts II respectively.

3. The multi-cable anchorage unit structure of a suspension bridge main cable according to claim 1 or 2, characterized in that: When N=2, the N mounting plates are arranged in parallel on the anchor pad; when N>2, the N mounting plates are arranged on the anchor pad according to the angles of a regular N polygon.

4. The multi-cable anchorage unit structure of a suspension bridge main cable according to claim 1 or 2, characterized in that: The number N of the main cables is 2≤N≤8.

5. The multi-cable anchorage unit structure of a suspension bridge main cable according to claim 1 or 2, characterized in that: The included angle formed by the central axes of the pin shafts I and the pin shafts II is 90°.

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