Device for dismantling single clamping piece group anchor type steel strand inhaul cable

Abstract

The utility model relates to an inhaul cable dismantling device, in particular to a device for dismantling a single clamping piece group anchor type steel strand inhaul cable, which comprises two sets of clamping devices, a tool nut, a tool pull rod and a jack. The two sets of clamping devices are respectively clamped on a to-be-replaced steel strand on a bridge floor, two ends of the tool pull rod respectively penetrate through the clamping devices, one end is connected with the tool nut, and the other end is connected with the tool nut after being provided with the jack; the clamping device comprises two Haver type clamping plates, a connecting screw rod and a connecting nut; the two Haver type clamping plates are connected together by the connecting screw rod through the connecting nut; the large-end opening of the conical anchor hole faces the inner side of the clamping device, and a tool clamping piece is installed between the conical anchor hole and the steel strand to be replaced. According to the utility model, the stress release section of the steel strand to be replaced is released on the bridge floor, the problems of high difficulty in overall unloading of cable force, difficulty in counteracting the tension elongation of the stay cable and insufficient operation space in the tower can be solved, and the device has the characteristics of low construction cost, high safety performance and the like, and is easy to popularize and apply.

Description

Technical Field

[0001] The utility model relates to a cable removal device, in particular to a device used for removing a single clip group anchor type steel strand cable. Background Art

[0002] The cable-stayed cable is an important component of the cable-stayed bridge, connecting the main tower and the main beam, and is known as the "lifeline" of the cable-stayed bridge. The clip-group anchored steel strand cable is a commonly used cable type and is widely used in many cable-stayed bridges at home and abroad. After decades of operation, the cables of these bridges have gradually reached the design replacement period. During the construction process of dismantling and replacing the cable-stayed cables, some bridges have the following problems: (1) The anchors at both ends of the cable have very little adjustable range, and some even have no adjustable range, making it difficult to unload the overall cable force; and the reserved length of the steel strand at the rear end of the anchor is short, which is not enough to offset the tension elongation of the cable. (2) The cable towers of a few cable-stayed bridges are equipped with maintenance elevators, maintenance stairs and other auxiliary structures, resulting in insufficient operating space inside the tower during cable replacement construction. The above problems bring great technical difficulties to the cable dismantling and replacement construction. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a device for removing a single strand of a clip-group anchored steel strand cable, so as to solve the technical problems existing in the prior art, such as the difficulty in unloading the overall cable force due to the small adjustable amount of the anchor, the short reserved length of the steel strand which is insufficient to offset the tensioning elongation of the cable, and the insufficient operating space in the cable replacement construction tower.

[0004] The technical solution to solve the above technical problems is: a device for removing a single strand of clip-group anchor-type steel strand cable, comprising a tool nut, a tool pull rod, and a jack; and also comprising two sets of clamping devices, which are respectively clamped on the steel strand to be replaced above the bridge deck, and the two ends of the tool pull rod respectively pass through the clamping devices, one end of which is fastened to the tool nut, and the other end is fastened to the tool nut after the jack is installed.

[0005] A further technical solution of the present utility model is: the clamping device includes two symmetrical Haversian splints, a connecting screw and a connecting nut, and a tool clamp; the two Haversian splints are provided with connecting holes along their longitudinal direction, the connecting screw passes through the connecting hole and the two Haversian splints are fastened together by the connecting nut; the two Haversian splints are also provided with semi-conical holes and semi-circular holes in the axial direction at their joints, and the semi-conical holes and semi-circular holes of the two Haversian splints are combined together to form a conical anchor hole for passing the steel strand to be replaced and a pull rod hole for passing the tool pull rod, respectively, the large end opening of the conical anchor hole faces the inner side of the clamping device, and the tool clamp is installed between the conical anchor hole and the steel strand to be replaced.

[0006] A further technical solution of the present invention is that the taper of the inner wall of the tapered anchor hole is consistent with the taper of the outer wall of the tool clamp.

[0007] A further technical solution of the present invention is that the connecting screw is a full-length threaded pull rod, and both ends of the connecting screw are respectively connected to the connecting nut through threads.

[0008] A further technical solution of the present invention is that a sensor for real-time monitoring of the actual pulling force of the tool rod during loading and unloading is installed on the tool rod between the clamping device and the tool nut.

[0009] A further technical solution of the present invention is that a support foot is installed between the clamping device and the jack, and a conversion nut is installed on the tool pull rod inside the support foot.

[0010] Due to the above structure, the device for removing a single strand of a clip-group anchor-type steel strand cable of the present invention has the following beneficial effects compared with the prior art:

[0011] 1. It can solve the technical problem of difficulty in unloading the overall cable force due to the lack of adjustment of the anchor

[0012] The utility model includes two sets of clamping devices, a tool nut, a tool pull rod, and a jack; wherein the two sets of clamping devices are respectively clamped on the steel strand to be replaced above the bridge deck, and the two ends of the tool pull rod respectively pass through the clamping devices, one end of which is fastened to the tool nut, and the other end is fastened to the tool nut after the jack is installed. During construction, a clamping device is used to anchor the steel strand to be replaced above the bridge deck, and the jack is turned on to tension the tool rod, so that the stress of the stress release section of the steel strand to be replaced is gradually transferred to the two tool rods, so that the stress of the stress release section of the steel strand to be replaced is gradually reduced to zero stress; the steel strand to be replaced is cut at the stress release section by a cutting tool; the jack returns, slowly unloading the force on the tool rod until the tool rod reaches a stress-free state, and the tool nut, jack and tool rod are removed in sequence; the cut steel strand is pulled out from the anchors at both ends respectively; the remaining steel strands of the bundle of cables are removed in the same way until the remaining steel strands are removed one by one, thereby achieving the purpose of removing the old cable. Therefore, the utility model tensions the stress release section of the steel strand to be replaced on the bridge deck, without adjusting the anchors at both ends of the cable, and can solve the technical problem of difficulty in unloading the overall cable force due to the lack of adjustment of the anchors.

[0013] 2. It can solve the technical problem that the reserved length of steel strand is too short to offset the lengthening of cable tension.

[0014] The utility model is to release the stress of the steel strand to be replaced on the bridge deck, without adjusting the anchors at both ends of the cable and without reserving the steel strand at the rear end of the anchor, which can solve the technical problem that the reserved length of the steel strand is short and insufficient to offset the tensioning elongation of the cable.

[0015] 3. It can solve the technical problem of difficulty in removing and replacing cables due to insufficient operating space inside the cable-stayed bridge tower

[0016] This utility model tensions the stress-relieving section of the strand to be replaced on the bridge deck. During construction, the top strand (the strand to be replaced) is raised and padded with blocks to separate it from the other strands, creating space for cable removal. This eliminates the need to use the interior of the cable-stayed bridge tower as a cable removal operation space, resolving the technical challenge of cable removal and replacement caused by insufficient operating space within the tower.

[0017] 4. Construction safety is highly controllable and construction cost is low

[0018] The utility model moves the key work of removing the cable from the tower to the bridge deck, which can greatly reduce the amount of high-altitude work and the amount of work in the sealed space. The construction is safe and controllable, reduces construction costs, and facilitates standardized construction.

[0019] 5. High construction safety performance

[0020] The utility model also installs a sensor on the tool pull rod between the clamping device and the tool nut. When the force value of the steel strand to be replaced is converted into the conversion force value of the clamping device, the actual pulling force of the tool pull rod during loading and unloading can be monitored in real time, which serves as a precise control of the cable replacement process and improves construction safety.

[0021] 6. It can realize the operation of tensioning and replacing cables of any length

[0022] The utility model also installs a support foot between the clamping device and the jack, and a conversion nut is installed on the tool rod inside the support foot. When the jack's single stroke cannot meet the tensioning requirements, the jack is extended one stroke, the conversion nut is tightened, and the jack is decompressed and returned. At this time, the conversion force is jointly carried by the conversion nut, tool rod and tool nut. Repeating this operation can effectively solve the problem of insufficient stroke of a single jack and realize the tensioning and replacement of cables of any length.

[0023] 7. Wide range of applications

[0024] The utility model is not only applicable to the dismantling construction of inclined cables, but also applicable to the dismantling of cables adopting clip group anchor type steel strand structure such as tie rods and external cables, and has a wide range of applications.

[0025] The technical features of the device for removing a single strand of a clip-group anchored steel strand cable according to the present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 : Schematic diagram of the structure of a device for removing a single strand of a clip-group anchored steel strand cable according to the first embodiment of the present invention (state before cutting the steel strand),

[0027] Figure 2 : Schematic diagram of the structure of a device for removing a single strand of a clip-group anchored steel strand cable according to the first embodiment of the present invention (after the strand is cut off).

[0028] Figure 3 : A front cross-sectional view of the clamping device described in Example 1,

[0029] Figure 4 : Figure 3 AA cross-sectional view,

[0030] Figure 5 : A schematic structural diagram of a device for removing a single strand of a clip-group anchored steel strand cable according to the second embodiment of the present invention;

[0031] Figure 6 : A schematic structural diagram of a device for removing a single strand of a clip-group anchored steel strand cable according to the utility model described in Example 3;

[0032] Figure 7 : A schematic structural diagram of a device for removing a single strand of a clip-group anchored steel strand cable according to the fourth embodiment of the present invention;

[0033] In the above drawings, the descriptions of the reference numerals are as follows:

[0034] 1- Clamping device,

[0035] 101-Harvard splint, 1011-connection hole, 1012-conical anchor hole, 1013-pull rod hole,

[0036] 102-connecting screw, 103-connecting nut, 104-tool clip,

[0037] 2- tool nut, 3- tool pull rod, 4- jack, 5- steel strand to be replaced,

[0038] 6-Sensor, 7-Support foot, 8-Conversion nut;

[0039] N - Inside of the clamping device. DETAILED DESCRIPTION Example 1

[0040] Figure 1-Figure 2 Disclosed is a device for removing a single strand of a clip-group anchored steel strand cable, comprising two sets of clamping devices 1, a tool nut 2, a tool pull rod 3, and a jack 4; the two sets of clamping devices 1 are respectively clamped on the steel strand 5 to be replaced above the bridge deck, and the two ends of the tool pull rod 3 respectively pass through the clamping devices 1, one end of which is fastened to the tool nut 2, and the other end is fastened to the tool nut 2 after the jack 4 is installed.

[0041] The clamping device 1 comprises two symmetrical Haversian clamping plates 101, a connecting screw 102 and a connecting nut 103, a tool clamp 104 (see Figure 3-Figure 4 The Haversian splint 101 is rectangular in shape, and two symmetrical Haversian splints are provided with connecting holes 1011 along their longitudinal direction; the connecting screw 102 is a full-length threaded pull rod, which passes through the connecting hole 1011 and is connected to the connecting nut 103 by threading, thereby fastening the two Haversian splints together; the two symmetrical Haversian splints 101 are also provided with a semi-conical hole and a semi-circular hole in the axial direction at their joint part, and the semi-circular holes of the two Haversian splints 101 are respectively provided with a semi-conical hole and a semi-circular hole in the axial direction. The conical holes are combined together to form a conical anchor hole 1012 for passing the steel strand 5 to be replaced; the semi-circular holes of the two Haversian clamps 101 are combined together to form a pull rod hole 1013 for passing the tool pull rod 3; the large end opening of the conical anchor hole 1012 faces the inner side N of the clamping device 1, and the tool clamp 104 is installed between the conical anchor hole 1012 and the steel strand 5 to be replaced; the inner wall taper of the conical anchor hole 1012 is consistent with the outer wall taper of the tool clamp 104.

[0042] The utility model performs the following construction process for removing a single cable:

[0043] Step 1: Remove the PE outer sheath of the stay cable within about 3m of the cable guide opening on the bridge deck;

[0044] Step 2: Use a steam crane to lift the topmost strand by about 110 mm. This strand is the strand 5 to be replaced. Place a 100 mm thick spacer (such as a hardwood block or rubber block) between the strand and the other strands to separate it by about 100 m, providing space for cable removal.

[0045] Step 3: Use the clamping device 1 to anchor the steel strand 5 to be replaced, install the jack 4 and tool nut 2 on one side, and install the tool nut 2 on the other side; the large openings of the tapered anchor holes 1012 of the two sets of clamping devices 1 are both facing the inner side N of the clamping device (the inner side of the clamping device is the stress relief section of the steel strand to be replaced), and install the tool clip 104 between the tapered anchor hole 1012 and the steel strand 5 to be replaced;

[0046] Step 4: Turn on the jack 4 and tension the tool rod 3, so that the force of the stress release section of the steel strand 5 to be replaced is gradually transferred to the two tool rods 3, so that the force of the stress release section of the steel strand 5 to be replaced is gradually reduced to zero stress;

[0047] Step 5: Use a cutting tool (such as a grinding wheel cutter or hydraulic shears, etc.) to cut (or shear) the steel strand 5 to be replaced near the midpoint of the stress release section;

[0048] Step 6: The jack 4 returns and the force on the tool rod 3 is slowly unloaded until the tool rod 3 reaches a stress-free state. The tool nut 2, jack 4 and tool rod 3 are removed in sequence.

[0049] Step 7: Pull out the cut steel strand 5 to be replaced from the anchors at both ends respectively;

[0050] Step 8: Continue to remove the remaining steel strands of the cable using the same method until the remaining steel strands are removed one by one, thus achieving the purpose of removing the old cable. Example 2

[0051] Figure 5 Disclosed herein is another device for removing a single strand of clip-group anchored steel strand cable. Its basic structure is the same as that of the first embodiment, including two sets of clamping devices 1, a tool nut 2, a tool rod 3, and a jack 4. The difference is that a sensor 6 for real-time monitoring of the actual tension of the tool rod 3 during loading and unloading is also installed on the tool rod 3 between the clamping device 1 and the tool nut 2.

[0052] The specific structure of the second embodiment is as follows:

[0053] A device for removing a single strand of a clip-group anchored steel strand cable comprises two sets of clamping devices 1, a tool nut 2, a tool pull rod 3, a jack 4, and a sensor 6; the two sets of clamping devices 1 are respectively clamped on the steel strand 5 to be replaced above the bridge deck, and both ends of the tool pull rod 3 pass through the clamping devices 1, one end of which is fastened to the tool nut 2, and the other end is fastened to the tool nut 2 after the jack 4 is installed.

[0054] The clamping device 1 includes two symmetrical Haversian splints 101, a connecting screw 102, a connecting nut 103, and a tool clamp 104; the Haversian splint 101 is rectangular in shape, and the two symmetrical Haversian splints are provided with connecting holes 1011 along their longitudinal directions; the connecting screw 102 is a full-length threaded pull rod, which passes through the connecting hole 1011 and is connected to the connecting nut 103 by threading, thereby fastening the two Haversian splints together; the two symmetrical Haversian splints 101 are also axially connected at their joints. It is provided with a semi-conical hole and a semicircular hole. The semi-conical holes of the two Haversian splints 101 are combined together to form a conical anchor hole 1012 for passing the steel strand 5 to be replaced; the semi-circular holes of the two Haversian splints 101 are combined together to form a pull rod hole 1013 for passing the tool pull rod 3; the large end opening of the conical anchor hole 1012 faces the inner side of the clamping device 1, and the tool clamp 104 is installed between the conical anchor hole 1012 and the steel strand 5 to be replaced; the inner wall taper of the conical anchor hole 1012 is consistent with the outer wall taper of the tool clamp 104.

[0055] The sensor 6 is installed on the tool rod 3 between the clamping device 1 and the tool nut 2. When the force value of the steel strand 5 to be replaced is converted into a force system with the conversion force value of the clamping device, the actual tension of the tool rod 3 during loading and unloading can be monitored in real time, which serves as a precise control of the cable replacement process and improves construction safety. Example 3

[0056] Figure 6 Disclosed herein is another device for removing a single strand of a clip-group anchored steel strand cable. Its basic structure is the same as that of the first embodiment, including two sets of clamping devices 1, a tool nut 2, a tool pull rod 3, and a jack 4. The difference is that a support foot 7 is installed between the clamping device 1 and the jack 4, and a conversion nut 8 is installed on the tool pull rod 3 inside the support foot 7.

[0057] The specific structure of the third embodiment is as follows:

[0058] A device for removing a single strand of a clip-group anchored steel strand cable comprises two sets of clamping devices 1, a tool nut 2, a tool pull rod 3, a jack 4, a support leg 7, and a conversion nut 8; the two sets of clamping devices 1 are respectively clamped on the steel strand 5 to be replaced above the bridge deck, and the two ends of the tool pull rod 3 respectively pass through the clamping devices 1, one end of which is fastened to the tool nut 2, and the other end is fastened to the tool nut 2 after the jack 4 is installed.

[0059] The clamping device 1 includes two symmetrical Haversian splints 101, a connecting screw 102, a connecting nut 103, and a tool clamp 104; the Haversian splint 101 is rectangular in shape, and the two symmetrical Haversian splints are provided with connecting holes 1011 along their longitudinal directions; the connecting screw 102 is a full-length threaded pull rod, which passes through the connecting hole 1011 and is connected to the connecting nut 103 by threading, thereby fastening the two Haversian splints together; the two symmetrical Haversian splints 101 are also axially connected at their joints. It is provided with a semi-conical hole and a semicircular hole. The semi-conical holes of the two Haversian splints 101 are combined together to form a conical anchor hole 1012 for passing the steel strand 5 to be replaced; the semi-circular holes of the two Haversian splints 101 are combined together to form a pull rod hole 1013 for passing the tool pull rod 3; the large end opening of the conical anchor hole 1012 faces the inner side of the clamping device 1, and the tool clamp 104 is installed between the conical anchor hole 1012 and the steel strand 5 to be replaced; the inner wall taper of the conical anchor hole 1012 is consistent with the outer wall taper of the tool clamp 104.

[0060] The support leg 7 is mounted between the clamping device 1 and the jack 4, and the conversion nut 8 is mounted on the tool rod 3 within the support leg 7. This effectively solves the problem of insufficient travel of a single jack, allowing the tensioning and replacement of cables of any length. When the jack 4 cannot meet the tensioning requirements in a single stroke, the jack 4 is extended one stroke, the conversion nut 8 is tightened, and the jack 4 is decompressed and returned. At this time, the conversion force is jointly carried by the conversion nut 8, the tool rod 3, and the tool nut 2. Repeating this operation solves the problem of multiple strokes of the jack 4 to implement force system conversion on cables of any length, enabling the tensioning and replacement of cables of any length. Example 4

[0061] Figure 7 Disclosed herein is another device for removing a single strand of a clip-group anchored steel strand cable. Its basic structure is the same as that of the second embodiment, including two sets of clamping devices 1, a tool nut 2, a tool pull rod 3, a jack 4, and a sensor 6. The difference is that a support foot 7 is installed between the clamping device 1 and the jack 4, and a conversion nut 8 is installed on the tool pull rod 3 inside the support foot 7.

[0062] The specific structure of the fourth embodiment is as follows:

[0063] A device for removing a single strand of a clip-group anchored steel strand cable comprises two sets of clamping devices 1, a tool nut 2, a tool pull rod 3, a jack 4, a sensor 6, a support leg 7, and a conversion nut 8; the two sets of clamping devices 1 are respectively clamped on the steel strand 5 to be replaced above the bridge deck, and the two ends of the tool pull rod 3 respectively pass through the clamping devices 1, one end of which is fastened to the tool nut 2, and the other end is fastened to the tool nut 2 after the jack 4 is installed.

[0064] The clamping device 1 includes two symmetrical Haversian splints 101, a connecting screw 102, a connecting nut 103, and a tool clamp 104; the Haversian splint 101 is rectangular in shape, and the two symmetrical Haversian splints are provided with connecting holes 1011 along their longitudinal directions; the connecting screw 102 is a full-length threaded pull rod, which passes through the connecting hole 1011 and is connected to the connecting nut 103 by threading, thereby fastening the two Haversian splints together; the two symmetrical Haversian splints 101 are also axially connected at their joints. It is provided with a semi-conical hole and a semicircular hole. The semi-conical holes of the two Haversian splints 101 are combined together to form a conical anchor hole 1012 for passing the steel strand 5 to be replaced; the semi-circular holes of the two Haversian splints 101 are combined together to form a pull rod hole 1013 for passing the tool pull rod 3; the large end opening of the conical anchor hole 1012 faces the inner side of the clamping device 1, and the tool clamp 104 is installed between the conical anchor hole 1012 and the steel strand 5 to be replaced; the inner wall taper of the conical anchor hole 1012 is consistent with the outer wall taper of the tool clamp 104.

[0065] The sensor 6 is installed on the tool rod 3 between the clamping device 1 and the tool nut 2. When the force value of the steel strand 5 to be replaced is converted into a force system with the conversion force value of the clamping device, the actual tension of the tool rod 3 during loading and unloading can be monitored in real time, which serves as a precise control of the cable replacement process and improves construction safety.

[0066] The support leg 7 is mounted between the clamping device 1 and the jack 4, and the conversion nut 8 is mounted on the tool rod 3 within the support leg 7. This effectively solves the problem of insufficient travel of a single jack, allowing the tensioning and replacement of cables of any length. When the jack 4 cannot meet the tensioning requirements in a single stroke, the jack 4 is extended one stroke, the conversion nut 8 is tightened, and the jack 4 is decompressed and returned. At this time, the conversion force is jointly carried by the conversion nut 8, the tool rod 3, and the tool nut 2. Repeating this operation solves the problem of multiple strokes of the jack 4 to implement force system conversion on cables of any length, enabling the tensioning and replacement of cables of any length.

Claims

1. A device for removing a single strand of a clip-group anchored steel strand cable, comprising a tool nut (2), a tool pull rod (3), and a jack (4); characterized in that: It also includes two sets of clamping devices (1), which are respectively clamped on the steel strands (5) to be replaced above the bridge deck, and the two ends of the tool pull rod (3) respectively pass through the clamping devices (1), one end of which is fastened to the tool nut (2), and the other end is fastened to the tool nut (2) after the jack (4) is installed.

2. The device for removing a single strand of a clip-group anchored steel strand cable according to claim 1, characterized in that: The clamping device (1) comprises two symmetrical Haversian clamping plates (101), a connecting screw (102), a connecting nut (103), and a tool clamp (104); the two Haversian clamping plates are provided with connecting holes (1011) along their longitudinal direction, the connecting screw (102) passes through the connecting hole (1011) and is fastened together by the connecting nut (103); the two Haversian clamping plates (101) are also provided with connecting holes (1011) along the axial direction at their joint part The semi-conical hole and the semi-circular hole are combined to form a conical anchor hole (1012) for passing the steel strand (5) to be replaced and a pull rod hole (1013) for passing the tool pull rod (3), respectively. The large end of the conical anchor hole (1012) opens toward the inner side of the clamping device (1), and the tool clamp (104) is installed between the conical anchor hole (1012) and the steel strand (5) to be replaced.

3. The device for removing a single strand of a clip-group anchored steel strand cable according to claim 2, characterized in that: The inner wall taper of the tapered anchor hole (1012) is consistent with the outer wall taper of the tool clamp (104).

4. The device for removing a single strand of a clip-group anchored steel strand cable according to claim 2, characterized in that: The connecting screw rod (102) is a full-length threaded pull rod, and both ends of the connecting screw rod (102) are respectively connected to the connecting nut (103) through threads.

5. The device for removing a single strand of a clip-group anchored steel strand cable according to claim 1, characterized in that: A sensor (6) for real-time monitoring of the actual pulling force of the tool pull rod (3) during loading and unloading is also installed on the tool pull rod (3) between the clamping device (1) and the tool nut (2).

6. A device for removing a single strand of a clip-group anchored steel strand cable according to claim 1 or 5, characterized in that: A support foot (7) is also installed between the clamping device (1) and the jack (4), and a conversion nut (8) is also installed on the tool pull rod (3) in the support foot (7).

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