Cable strand connection structure, anchorage structure and construction method for replacing main cable of suspension bridge

Abstract

The present invention discloses a cable strand connection structure, an anchoring structure and a construction method for replacing the main cable of a suspension bridge. The cable strand connection structure includes a cable strand connection plate; the cable strand connection plate is provided with a prestressed anchor cable passageway, an original tie rod hole and an anchor hole penetrating the upper and lower end surfaces thereof; wherein the prestressed anchor cable passageway is located in the middle of the cable strand connection plate; the anchor holes are located at both ends of the cable strand connection plate, and are used to connect the new main cable strand anchoring structure; the positions of the original tie rod holes correspond to the tie rod holes on the original cable strand connection plate. The present invention discloses a cable strand connection structure, an anchoring structure and a construction method for replacing the main cable of a suspension bridge. During the construction process, the original anchoring structure can be used to bear the anchoring force of the main cable. After the new anchoring structure and the new main cable are installed, the original main cable anchoring structure is removed. Therefore, the construction process does not affect traffic.

Description

Technical Field

[0001] The invention relates to an anchoring structure, in particular to a cable strand connection structure, an anchoring structure and a construction method for replacing a main cable of a suspension bridge. Background Art

[0002] As the bridge with the largest span capacity, suspension bridge has been developed rapidly in my country. The main cable, which is the lifeline of suspension bridge, has always been the main research topic of engineering and technical personnel in various countries in the world. In particular, the research on the anti-corrosion of the main cable is particularly important, because if the cable system is corroded, the consequences are unimaginable. In order to ensure the safety of the bridge and the cable structure, the cable must be protected from corrosion. However, the research on the anti-corrosion of the main cable of the suspension bridge has not yet achieved satisfactory results. Therefore, many bridge cables still rely on the replacement of cables to solve the corrosion and safety performance problems of bridge cables. In the structural system of the suspension bridge, there are cable clamps for the use of replaceable main cables on newly built small suspension bridges. Only after using the cable clamps can the main cables of the suspension bridge be replaced. In the anchorage system, the anchorage problem of the new main cable is solved by building a new anchorage system. At present, there is no anchorage structure and method for the anchorage of the new main cable in the replacement construction of the main cable of the large and completed suspension bridge, which is improved on the basis of the original anchorage structure. Summary of the invention

[0003] In view of the above problems, the present invention provides a cable strand connection structure, an anchoring structure and a construction method for replacing the main cable of a suspension bridge, aiming to solve the problems of how to improve the anchoring structure for anchoring the new main cable based on the original anchoring structure during the construction of replacing the main cable; and how to replace the main cable, sling and improve the anchoring structure without affecting traffic.

[0004] The present invention adopts the following technical solutions to achieve the above purpose:

[0005] A cable strand connection structure for replacing the main cable of a suspension bridge comprises a cable strand connection plate for replacing an original cable strand connection plate; the cable strand connection plate is provided with a prestressed anchor cable passageway, an original tie rod hole and an anchor hole penetrating through its upper and lower end surfaces; wherein the prestressed anchor cable passageway is located in the middle of the cable strand connection plate and is clamped to the anchor head of the prestressed anchor; the anchor holes are located at both ends of the cable strand connection plate and are used to connect a new main cable strand anchoring structure; the position of the original tie rod hole corresponds to the tie rod hole on the original cable strand connection plate. The anchor connection structure of the present technical solution adopts a new cable strand connection plate to replace the original cable strand connection plate, and an anchor hole for connecting the new main cable strand anchoring structure is added, so that the new main cable and the original main cable can be anchored on the new cable strand connection plate at the same time, which is convenient for the system conversion of the new main cable and the original main cable, and ensures that the main cable is safe, reliable, stable and durable during and after the cable replacement; during the construction process, the original anchor structure can be used to bear the anchoring force of the main cable, and after the new anchor structure and the new main cable are installed, the original main cable anchor structure is removed, so that the construction process does not affect traffic; the new main cable hanging cable is easy to adjust the linear operation, the old main cable is easy to remove, and the removal steps are simple and convenient.

[0006] A further technical solution is to provide an anchoring structure for replacing the main cable of a suspension bridge, comprising the above-mentioned cable strand connection structure, and also comprising a first tie rod passing through the original tie rod hole, an original cable strand anchor head connected to one end of the first tie rod, a first locking nut connected to the other end of the first tie rod, and a new main cable strand anchoring structure connected to the anchor hole. During the tensioning process, the cable strand connection plate is clamped to the anchor head of the prestressed anchor at its lower end, and the cable strand connection plate tends to balance through the downward tension of the prestressed anchor and the upward tension of the first tie rod, so the cable strand connection plate remains in a fixed position during the tensioning process.

[0007] Its further technical solution is that the new main cable strand anchoring structure includes a second pull rod passing through the anchor hole, a new cable strand anchor head connected to the top end of the second pull rod, and a second locking nut connected to the bottom end of the second pull rod, and the second pull rod is provided with a thread matching the second locking nut; the new cable strand anchor head is used for anchoring the new main cable strand; and the second locking nut is stuck in the bottom end of the anchor hole.

[0008] A further technical solution is to provide a method for constructing an anchor structure for replacing a main cable of a suspension bridge, comprising the above-mentioned anchor structure, and comprising the following steps:

[0009] A) Measure the cable force of the original main cable strand on the original cable strand connection plate;

[0010] B) Remove the original tie rod and its components;

[0011] C) Remove the anchor head and components of the prestressed anchor and remove the original cable strand connection plate;

[0012] D) Install the cable strand connection plate, pass the anchor cable of the prestressed anchor through the cable hole of the prestressed anchor, install the anchor head of the prestressed anchor on the upper end surface of the cable hole of the prestressed anchor, adjust and re-tension the prestressed anchor to the designed cable force;

[0013] E) connecting the original cable strand anchor head to the cable strand connection plate through the first tension rod, and tensioning and adjusting the cable force to the same as the original cable force;

[0014] F) Install the new main cable strand anchoring structure and connect it to the new cable strand connecting plate through the anchor holes;

[0015] G) Install new main cable strands and adjust the main cable shape to the design requirements;

[0016] H) After the new main cable system is converted, remove the original main cable strands and original pull rod assemblies.

[0017] Its further technical solution is that step F also includes:

[0018] F1) Install the second tie rod at the anchor hole;

[0019] F2) Install the new cable anchor head at the top of the second tie rod;

[0020] F3) Install the second locking nut at the bottom end of the second tie rod.

[0021] The working principle of the present invention is:

[0022] The middle section of the main cable of the existing suspension bridge is connected to the beam end through a sling structure, and the two ends pass through the main cable saddle at the top of the tower, and then pass through the loose cable saddle respectively. The loose cable saddle changes the force transmission direction of the main cable and disperses the main cable into many strands, which are anchored on the corresponding anchoring structures. The present invention adopts the above-mentioned strand connection structure and anchoring structure to replace the anchoring part of the main cable of the suspension bridge. During the installation process of the anchoring connection structure, the anchoring connection structure is installed on the basis of the continuous operation of the original anchoring structure. The anchoring system of the suspension bridge is composed of many anchoring structures described in the present invention. During the installation process, the original anchoring structures are improved one by one, so the overall use function of the anchoring system of the suspension bridge and the overall stress condition of the original main cable are not affected.

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a cable strand connection structure, an anchoring structure and a construction method for replacing the main cable of a suspension bridge. A new cable strand connection plate is used to replace the original cable strand connection plate, and an anchor hole for connecting the new main cable strand anchoring structure is added, so that the new main cable and the original main cable can be anchored on the new cable strand connection plate at the same time, which is convenient for the system conversion between the new main cable and the original main cable, and ensures that the main cable is safe, reliable, stable and durable during and after the cable replacement. During the construction process, the original anchoring structure can be used to bear the anchoring force of the main cable, and after the new anchoring structure and the new main cable are installed, the original main cable anchoring structure is removed, so that the traffic is not affected during the construction process. The new main cable hanging cable is easy to adjust the linear operation, the old main cable is easy to remove, and the removal steps are simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic diagram of an anchorage structure for replacing a main cable of a suspension bridge.

[0026] Figure 2 The present invention provides a stereoscopic diagram of an anchoring structure for replacing a main cable of a suspension bridge.

[0027] Figure 3 The present invention is a schematic diagram of a cable strand connection structure for replacing a main cable of a suspension bridge.

[0028] Figure 4 Schematic diagram of the original cable strand connecting plate structure of a suspension bridge according to the present invention.

[0029] In the figure:

[0030] 1. Original cable strand connection plate; 101. Original cable strand anchor head; 11. Original cable strand connection tube; 12. Original anchor head protection cover; 15. Anchor head of prestressed anchor; 2. Cable strand connection plate; 201. New cable strand anchor head; 210. Cable passage for prestressed anchor; 220. Anchor hole; 230. Original tie rod hole; 31. First tie rod; 310. First locking nut; 41. Second tie rod; 410. Second locking nut. DETAILED DESCRIPTION

[0031] The following is combined with Figures 1 to 4 The present invention is described in detail with specific implementation modes. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0032] like Figure 4As shown, the original cable strand connection structure that needs to be replaced in this embodiment includes an original cable strand connection plate 1, a prestressed anchor located at its lower end, a first pull rod 31 located at its upper end, and an original cable strand anchor head 101. The upper end surface of the original cable strand connection plate 1 is clamped to the anchor head 15 of the prestressed anchor. The prestressed anchor applies a downward pulling force to the original cable strand connection plate 1. The lower end of the first pull rod 31 passes through the pull rod hole on the original cable strand connection plate 1 and is connected to a nut. The nut is clamped to the lower end surface of the pull rod hole. The upper end of a pull rod 31 is connected to the original cable strand anchor head 101, and the original cable strand anchor head 101 is connected to the old main cable. The first pull rod 31 applies an upward pulling force to the original cable strand connecting plate 1, so the original cable strand connecting plate 1 is in a balanced state during use. In actual engineering, an anchor head protection cover 12 can be installed on the periphery of the anchor head 15 of the prestressed anchor, and connected to the original cable strand connecting plate 1 by screws. The original cable strand connecting tube 11 is at the lower end of the original cable strand connecting plate 1 and is connected to the original cable strand connecting plate 1 by screws.

[0033] like Figures 1 to 3 As shown, this embodiment provides a cable strand connection structure for replacing the main cable of a suspension bridge. The structure described in this embodiment is used in the construction of replacing the main cable. The new main cable is located above the old main cable. The original cable strand connection plate needs to be removed and then the cable strand connection plate 2 is installed. The cable strand connection structure includes a cable strand connection plate 2. The cable strand connection plate 2 is provided with a prestressed anchor cable passage 210, an original tie rod hole 230 and an anchor hole 220 penetrating the upper and lower end surfaces thereof. The prestressed anchor cable passage 210 is located in the middle of the cable strand connection plate 2 and is clamped to the anchor head 15 of the prestressed anchor. The position of the original tie rod hole 230 corresponds to the tie rod hole on the original cable strand connection plate. The anchor holes 220 are located at both ends of the cable strand connection plate 2 and are used to connect the new main cable strand anchoring structure. The angle of the anchor hole 220 is determined according to the installation position and tensioning strength of the new main cable, and is not limited here.

[0034] The anchoring structure using the cable strand connection structure of the present embodiment also includes a first tie rod 31 passing through the original tie rod hole 230, an original cable strand anchor head 101 connected to one end of the first tie rod 31, and a first locking nut 310 connected to the other end of the first tie rod 31, wherein the first tie rod 31 can be determined according to the degree of use of the original tie rod, and the original tie rod or the new tie rod can be selected; a new main cable strand anchoring structure connected to the anchor hole 220, specifically, the new main cable strand anchoring structure is a second tie rod 41 passing through the anchor hole 220, a new cable strand anchor head 201 connected to the top end of the second tie rod 41, and a second locking nut 410 connected to the bottom end of the second tie rod 41, wherein the second tie rod 41 is provided with a screw matched with the second locking nut 410. The anchor head 201 of the new cable strand is used to anchor the new main cable strand; the second locking nut 410 is stuck at the bottom end of the anchor hole 220; the anchor cable of the prestressed anchor passes through the prestressed anchor cable passage 210, and the anchor head 15 of the prestressed anchor is installed on the upper end face of the cable strand connecting plate 2, and the anchor head 15 of the prestressed anchor is clamped on the upper end face of the prestressed anchor cable passage 210 (the outer diameter of the anchor head 15 of the prestressed anchor is larger than the prestressed anchor cable passage 210); during the tensioning process, the cable strand connecting plate 2 is clamped on the anchor head 15 of the prestressed anchor at its lower end, and the cable strand connecting plate 2 is balanced by the downward tension of the prestressed anchor and the upward tension of the first pull rod 31, so the cable strand connecting plate 2 remains in a fixed position during the tensioning process. The construction method includes the following steps:

[0035] A) Measure the cable force of the original main cable strand on the original cable strand connection plate;

[0036] B) Remove the original tie rod and its components, including the first locking nut and washer, etc. At this time, the original tie rod together with the original cable strand anchor head and the original main cable strand are removed from the original cable strand connection plate;

[0037] C) Remove the anchor head and components of the prestressed anchor (the components include the anchor head protection cover, cable strand connection tube, etc. of the prestressed anchor), and remove the original cable strand connection plate;

[0038] D) Install the cable strand connection plate, pass the anchor cable of the prestressed anchor through the cable hole of the prestressed anchor, install the anchor head of the prestressed anchor on the upper end surface of the cable hole of the prestressed anchor, adjust and re-tension the prestressed anchor to the designed cable force;

[0039] E) connecting the original cable strand anchor head to the cable strand connection plate through a first tie rod, and tensioning and adjusting the cable force to the same as the original cable force; specifically, the first tie rod in this embodiment adopts the original tie rod, and the bottom end of the original tie rod is passed through the original tie rod hole of the cable strand connection plate and locked by a first locking nut, and the first locking nut is clamped at the bottom end of the original tie rod hole. In addition, it is also possible to determine the replacement of a new tie rod according to the use of the original tie rod;

[0040] F) Install the new main cable strand anchoring structure and connect it to the new cable strand connecting plate through the anchor hole. Specifically,

[0041] F1) Install the second tie rod at the anchor hole.

[0042] F2) Install the new cable anchor head at the top of the second tie rod.

[0043] F3) Installing a second locking nut at the bottom end of the second pull rod so that the second locking nut is clamped to the bottom end surface of the cable strand connecting plate;

[0044] G) Install new main cable strands and adjust the main cable shape to the design requirements;

[0045] H) After the new main cable system is converted, remove the original main cable strands and original pull rod assemblies.

[0046] The above-mentioned embodiment exemplarily shows the anchoring structure of the new main cable strand. According to other embodiments and practical applications, a pressure-bearing cable strand anchor head or an adjustable threaded cable strand anchor head can also be used as an alternative. One end of the pressure-bearing cable strand anchor head is located at the bottom end of the anchor hole 220, and the new main cable strand passes through the anchor hole 220 to be connected to the anchoring structure at the other end; the adjustable threaded cable strand anchor head cooperates with the thread of the inner ring of the anchor hole 220, and the new main cable strand passes through the anchor hole 220 to be connected to the anchoring structure at the other end.

[0047] The present invention provides a cable strand connection structure, an anchoring structure and a construction method for replacing the main cable of a suspension bridge. A new cable strand connection plate is used to replace the original cable strand connection plate, and an anchor hole for connecting the new main cable strand anchoring structure is additionally provided, so that the new main cable and the original main cable can be anchored on the cable strand connection plate at the same time, which is convenient for the system conversion between the new main cable and the original main cable, and ensures that the main cable is safe, reliable, stable and durable during and after the cable replacement. During the construction process, the original anchoring structure can be used to bear the anchoring force of the main cable, and after the new anchoring structure and the new main cable are installed, the original main cable anchoring structure is removed, so that the traffic is not affected during the construction process. The new main cable hanging cable is convenient to adjust the linearity, the old main cable is easy to remove, and the removal steps are simple and convenient.

Claims

1. A method for constructing an anchorage structure for replacing a main cable of a suspension bridge, characterized in that: The anchoring structure comprises a cable strand connection structure; the cable strand connection structure comprises a cable strand connection plate (2); the cable strand connection plate (2) is provided with a prestressed anchor cable passage (210), an original tie rod hole (230) and an anchor hole (220) penetrating the upper and lower end surfaces thereof; Wherein, the prestressed anchor cable passage (210) is located in the middle of the cable strand connection plate (2) and is clamped to the anchor head (15) of the prestressed anchor; Anchor holes (220) are located at both ends of the cable strand connection plate (2) and are used to connect a new main cable strand anchoring structure; The position of the original tie rod hole (230) corresponds to the tie rod hole on the original cable strand connection plate; The anchoring structure further comprises a first tie rod (31) passing through an original tie rod hole (230), an original cable strand anchor head (101) connected to one end of the first tie rod (31), a first locking nut (310) connected to the other end of the first tie rod (31), and a new main cable strand anchoring structure connected to the anchor hole (220); The new main cable strand anchoring structure comprises a second pull rod (41) passing through the anchor hole (220), a new cable strand anchor head (201) connected to the top end of the second pull rod (41), and a second locking nut (410) connected to the bottom end of the second pull rod (41), wherein the second pull rod (41) is provided with a thread matching the second locking nut (410); the new cable strand anchor head (201) is used for anchoring the new main cable strand; and the second locking nut (410) is clamped at the bottom end of the anchor hole (220); The construction method comprises the following steps: A) Measure the cable force of the original main cable strand on the original cable strand connection plate; B) Remove the original tie rod and its components; C) Remove the anchor head and components of the prestressed anchor and remove the original cable strand connection plate; D) Install the cable connecting plate, pass the anchor cable of the prestressed anchor through the cable hole of the prestressed anchor, install the anchor head of the prestressed anchor on the upper end surface of the cable hole of the prestressed anchor, adjust and re-tension the prestressed anchor to the designed cable force; E) Connect the original cable strand anchor head to the cable strand connection plate through the first tension rod, and tension and adjust the cable force to the same as the original cable force; F) Install the new main cable strand anchoring structure and connect it to the new cable strand connecting plate through the anchor holes; G) Install new main cable strands and adjust the main cable shape to the design requirements; H) After the new main cable system is converted, remove the original main cable strands and original pull rod assemblies.

2. The method for constructing an anchorage structure for replacing a main cable of a suspension bridge according to claim 1, characterized in that: in, Step F also includes: F1) Install the second tie rod at the anchor hole; F2) Install the new cable anchor head at the top of the second tie rod; F3) Install the second locking nut at the bottom end of the second tie rod.

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