Prestressed cable dismantling protection device

Abstract

The utility model discloses a prestressed cable dismantling protection device, which comprises a clamp, a protective sleeve, a protective sleeve, a protective sleeve and a protective sleeve, wherein the clamp is sleeved on the periphery of a to-be-dismantled prestressed cable; when the middle section of the prestressed cable to be disassembled is disassembled, the number of the clamps is two, the clamps are arranged at intervals in the axial direction of the prestressed cable to be disassembled, the distance between the two clamps is not larger than 40 cm, and the position to be cut is located between the two clamps; when the fixed end of the to-be-disassembled prestressed cable is disassembled, one group of clamps are arranged, the distance between the clamps and the fixed end of the to-be-disassembled prestressed cable is not greater than 40cm, and the to-be-cut part is positioned between the clamps and the fixed end; any clamp is connected with a connecting piece, and the connecting piece is used for limiting and fixing the clamp. The end of the cut prestressed cable is restrained through the clamp and the connecting piece, and the construction risk caused by rapid release of stress in the cut prestressed cable can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of bridge maintenance and repair technology. More specifically, this utility model relates to a protective device for removing prestressed cables. Background Technology

[0002] In modern bridge engineering, prestressing technology is widely used to improve the load-bearing capacity of structures, reduce deformation, and enhance durability. As a core load-bearing component, the prestressed cable is typically designed for a lifespan of 20 years. However, during actual operation, due to various factors such as design level, materials, manufacturing technology, installation quality, live load control, bridge site environment, and maintenance monitoring, prestressed cables often require maintenance, repair, or replacement before reaching their design lifespan to ensure structural safety.

[0003] Repairing or replacing prestressed cables requires cutting them. Because there is stress in the prestressed cables, the stress will be released rapidly when the cables are cut, resulting in violent rebound, vibration, or even impact. This seriously threatens the structural safety of the bridge and the personal safety of construction workers. The removal is difficult and carries high safety risks. Summary of the Invention

[0004] Another objective of this invention is to provide a prestressed cable removal protection device that can avoid construction risks caused by the rapid release of stress inside the prestressed cable after cutting.

[0005] In order to achieve these objectives and other advantages according to the present invention, a prestressed cable removal protection device is provided, including a clamp that is sleeved on the outer periphery of the prestressed cable to be removed along the axial direction of the prestressed cable to be removed.

[0006] Specifically, when removing the middle section of the prestressed cable to be dismantled, two sets of clamps are provided, which are spaced apart along the axial direction of the prestressed cable to be dismantled, with a distance of no more than 40cm between the two sets of clamps, and the cutting point is located between the two sets of clamps; when removing the fixed end of the prestressed cable to be dismantled, one set of clamps is provided, with a distance of no more than 40cm between it and the fixed end of the prestressed cable to be dismantled, and the cutting point is located between the clamp and the fixed end.

[0007] Any clamp is connected to a connector, which is configured to limit and fix the clamp.

[0008] Preferably, when the prestressed cable to be dismantled is a single row of prestressed cables, the clamp is connected and fixed to the bridge deck bottom plate through the connector; when the prestressed cable to be dismantled is a multi-row prestressed cable, the clamps located on the upper row of prestressed cables and the clamps located on the lower row of prestressed cables are correspondingly connected and fixed through the connector.

[0009] Preferably, the clamp includes two symmetrically arranged bands, each band having an extension plate at its two free ends. The two bands are fitted around the periphery of the prestressed cable to be dismantled, and the two extension plates at the same free end are connected as a whole by bolts. The difference between the width of the band and the elongation of the prestressed cable to be dismantled is not less than 50 cm.

[0010] Preferably, the connector includes multiple connecting plates, which are spaced apart along the axial direction of the prestressed cable to be dismantled. Any connecting plate is detachably connected to the extension plate, and any connecting plate is arranged perpendicular to the axial direction of the prestressed cable to be dismantled.

[0011] Preferably, the number of connecting plates is set to 2% to 20% of the tension of the prestressed cable to be dismantled.

[0012] Preferably, the inner wall of the hoop is provided with threaded ribs.

[0013] This utility model has at least the following beneficial effects:

[0014] 1. This utility model uses different clamps to install different parts to be cut. The clamps and connectors limit the cutting range of the prestressed cable to be dismantled before cutting. The ends of the cut prestressed cable are constrained by the clamps and connectors, which can avoid the construction risks caused by the rapid release of stress inside the cut prestressed cable. The middle section of the prestressed cable to be dismantled is removed, and the distance between the two sets of clamps is set to no more than 40cm. The fixed end is also removed, and the distance between the clamp and the fixed end is set to no more than 40cm. All of these are to avoid the risk of injury from shaking due to the excessive length of the cut prestressed cable ends.

[0015] 2. This utility model sets the width of the clamp to be no less than 50cm from the elongation of the prestressed cable to be dismantled, so that the prestressed cable after cutting can always be constrained in the clamp, ensuring the constraint effect on the prestressed cable.

[0016] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the installation structure of the prestressed cable removal protection device for removing the middle section of a single row of prestressed cables according to this utility model;

[0018] Figure 2 This is a schematic diagram of the installation structure of the prestressed cable removal protection device for removing the fixed end of a single row of prestressed cables according to this utility model.

[0019] Figure 3This is a side view of the installation structure of the prestressed cable removal protection device for removing the middle section of multiple rows of prestressed cables according to this utility model;

[0020] Figure 4 This is a schematic diagram of the installation structure of the prestressed cable removal protection device for removing the fixed ends of multiple rows of prestressed cables according to this utility model.

[0021] Figure 5 This is a front view structural diagram of the clamp and connector of this utility model;

[0022] Explanation of reference numerals on the accompanying drawings:

[0023] 1. Prestressed cable to be dismantled; 2. Clamp, 201. Hoop, 202. Extension plate, 3. Connecting plate, 301. Plate unit, 4. Anchoring lug, 5. Bridge deck bottom plate, 6. Bolt. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0025] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] like Figure 1-5 As shown, this utility model provides a prestressed cable removal protection device, including a clamp 2, which is sleeved on the outer periphery of the prestressed cable 1 to be removed along the axial direction of the prestressed cable 1 to be removed;

[0027] Specifically, when removing the middle section of the prestressed cable 1 to be dismantled, two sets of clamps 2 are provided, which are spaced apart along the axial direction of the prestressed cable 1 to be dismantled. The distance between the two sets of clamps 2 is no more than 40cm, and the cutting point is located between the two sets of clamps 2. When removing the fixed end of the prestressed cable 1 to be dismantled, one set of clamps 2 is provided, and the distance between the clamp and the fixed end of the prestressed cable 1 to be dismantled is no more than 40cm. The cutting point is located between the clamp 2 and the fixed end.

[0028] Any clamp 2 is connected to a connector, wherein the connector is configured to limit and fix the clamp 2.

[0029] The prestressed cable 1 to be dismantled in this utility model is a prestressed cable inside a box girder. In the above technical solution, the clamp 2 is sleeved on the outer periphery of the prestressed cable 1 to be dismantled for clamping the prestressed cable 1. The arrangement position and number of clamps 2 are different for different cutting parts. Specifically: for example... Figure 1 , Figure 3 As shown, for the removal of the middle section of the prestressed cable 1, two sets of clamps 2 are installed on the prestressed cable 1. Each set of clamps 2 is fixed by a connector. After the clamps 2 are installed, a suitable position is selected between the two sets of clamps 2 to cut the prestressed cable 1, thus completing the removal of the prestressed cable. Figure 2 , Figure 4 As shown, for the removal of the fixed end of the prestressed cable 1 to be dismantled, a set of clamps 2 are installed on the prestressed cable 1 to be dismantled. The clamps 2 are fixed by limiting the position through the connector. After the clamps 2 are installed, the prestressed cable to be dismantled is cut at a suitable position between the clamps 2 and the fixed end, thus completing the dismantling operation of the prestressed cable. This utility model installs clamps 2 according to different parts to be cut. The cutting range of the prestressed cable 1 to be dismantled is limited by the clamps 2 and the connector before cutting. The end of the cut prestressed cable is constrained by the clamps 2 and the connector, which can avoid the construction risk caused by the rapid release of stress inside the cut prestressed cable. The distance between the two sets of clamps 2 is set to L≤40cm when dismantling the middle section of the prestressed cable 1 to be dismantled, and the distance between the clamps 2 and the fixed end is set to L≤40cm when dismantling the fixed end. These measures are all to avoid the risk of injury from shaking due to the excessive length of the cut end of the prestressed cable.

[0030] In another technical solution, when the prestressed cable 1 to be dismantled is a single row of prestressed cables, the clamp 2 is connected and fixed to the bridge deck bottom plate 5 through the connector; when the prestressed cable 1 to be dismantled is a multi-row prestressed cable, the clamp 2 located in the upper row of prestressed cables 1 to be dismantled and the clamp 2 located in the lower row of prestressed cables 1 to be dismantled are correspondingly connected and fixed through the connector.

[0031] In this technical solution, there are various arrangements of prestressed cables. For different arrangements of prestressed cables, the clamp 2 uses different limiting and fixing methods through the connectors. Specifically: Figure 1 , Figure 2 As shown, the prestressed cable 1 to be dismantled adopts a single-row layout. One end of the connector is connected to the clamp 2, and the other end is connected to the bridge deck bottom plate 5. The clamp 2 is installed and fixed on the bridge deck bottom plate 5 through the connector, thereby achieving the limitation and fixation of the installation position of the clamp 2; as shown Figure 3 , Figure 4As shown, the prestressed cables 1 to be dismantled are arranged in multiple rows. One end of the connector is connected to the clamp 2 on the upper row of prestressed cables 1 to be dismantled, and the other end is connected to the clamp 2 on the lower row of prestressed cables below it. The connector connects two adjacent clamps 2 in the longitudinal direction into a whole. The lower row of clamps 2 is used to limit and fix the upper row of clamps 2. The dismantling sequence of the multiple rows of prestressed cables is as follows: First, dismantle the upper row of prestressed cables 1 to be dismantled. Then, remove the clamps 2 on them and install them on the lower row of prestressed cables 1 to be dismantled. After connecting the clamps 2 into a whole according to the above connection method, dismantle the lower row of prestressed cables 1 to be dismantled. Dismantle them in order from top to bottom. When dismantling the bottom row of prestressed cables, it can be treated as a single row arrangement and dismantled in the same way as dismantling a single row of prestressed cables 1 to be dismantled.

[0032] In another technical solution, the clamp 2 includes two symmetrically arranged bands 201, and each band 201 has an extension plate 202 at its two free ends. The two bands 201 are fitted around the outer periphery of the prestressed cable 1 to be dismantled. The two extension plates 202 located at the same free end are connected into a whole by bolts 6. The difference between the width of the band 201 and the elongation of the prestressed cable 1 to be dismantled is not less than 50cm.

[0033] In this technical solution, such as Figure 5 As shown, the clamp 2 consists of two straps 201 with extension plates 202 at both free ends. Bolt holes 6 are provided on the extension plates 202. After the two straps 201 are wrapped around the prestressed cable 1 to be dismantled, the clamp 2 is installed on the outer periphery of the prestressed cable 1 by passing the bolts 6 through the bolt holes. Since the straps 201 are wrapped around the outer periphery of the prestressed cable 1 to be dismantled, there is a certain gap between the straps 201 and the cable body. When the prestressed cable is cut, the prestressed cable will rebound due to stress, and relative sliding will occur between the prestressed cable and the straps 201. The width dimension A of the straps 201 is set such that the difference between the width dimension A and the elongation B of the prestressed cable 1 to be dismantled is not less than 50cm, so that the prestressed cable after cutting can always be constrained in the clamp 2, ensuring the constraint effect on the prestressed cable.

[0034] In another technical solution, the connector includes a plurality of connecting plates 3, which are spaced apart along the axial direction of the prestressed cable 1 to be dismantled. Any connecting plate 3 is detachably connected to the extension plate 202, and any connecting plate 3 is arranged perpendicular to the axial direction of the prestressed cable 1 to be dismantled.

[0035] In this technical solution, bolt holes are provided at both ends of the connecting plate 3, such as... Figure 2 As shown, for a single row of prestressed cables, one end of the connecting plate 3 is mounted on the extension plate 202 of one free end of the clamp 2 by means of bolts 6 passing through bolt holes; the other end of the connecting plate 3 is connected to the anchoring lug 4 on the bridge deck bottom plate 5 by bolts 6; as shown Figure 4 As shown, for multi-row prestressed cables, both ends of the connecting plate 3 are detachably connected to the extension plate 202 of one free end of the upper row clamp 2 and the lower row clamp 2 respectively by bolts 6; as Figure 5 As shown, the connecting plate 3 may include two plate units 301, which are symmetrically arranged on both sides of the two extension plates 202 at one free end of the clamp 2. The plate unit 301 has bolt holes that correspond to and match the bolt holes on the extension plates 202. The bolts 6 pass through the bolt holes on the plate unit 301 and the extension plates 202, and the connecting plate 3 is connected to the clamp 2 by nuts. The plate unit 301 is a steel plate.

[0036] In another technical solution, the number of connecting plates 3 is set to 2% to 20% of the tension of the prestressed cable 1 to be dismantled.

[0037] In this technical solution, the tension of the prestressed cable to be dismantled can be read by the bridge monitoring system. After determining the tension, the number of connecting plates 3 is designed. The number of connecting plates 3 is set to 2% to 20% of the tension of the prestressed cable 1 to be dismantled. This ensures that after the prestressed cable 1 to be dismantled is cut, the connecting parts can still maintain the stability of the clamp 2 connected to it, and ensure the constraint effect of the clamp 2 on the prestressed cable.

[0038] In another technical solution, the inner wall of the hoop 201 is provided with threaded ribs.

[0039] In this technical solution, the threaded ribs are used to enhance the friction between the hoop 201 and the prestressed cable 1 to be dismantled, and to ensure the constraint effect of the clamp 2 on the prestressed cable; multiple threaded ribs can be provided, which are spaced apart along the width direction of the hoop 201, and any threaded rib is provided along the length direction of the hoop 201.

[0040] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A pre-stressed cable dismantling protection device, characterized in that, Includes clamps, which are sleeved on the outer periphery of the prestressed cable to be dismantled along the axial direction of the prestressed cable to be dismantled; Specifically, when removing the middle section of the prestressed cable to be dismantled, two sets of clamps are provided, which are spaced apart along the axial direction of the prestressed cable to be dismantled, with a distance of no more than 40cm between the two sets of clamps, and the cutting point is located between the two sets of clamps; when removing the fixed end of the prestressed cable to be dismantled, one set of clamps is provided, with a distance of no more than 40cm between it and the fixed end of the prestressed cable to be dismantled, and the cutting point is located between the clamp and the fixed end. Any clamp is connected to a connector, which is configured to limit and fix the clamp.

2. The pre-stressed cable removal protection device of claim 1, wherein, When the prestressed cable to be dismantled is a single row of prestressed cables, the clamp is connected and fixed to the bridge deck bottom plate through the connector; when the prestressed cable to be dismantled is a multi-row prestressed cable, the clamp located on the upper row of prestressed cables and the clamp located on the lower row of prestressed cables are connected and fixed accordingly through the connector.

3. The pre-stressed cable removal protection device of claim 1, wherein, The clamp includes two symmetrically arranged bands, each band having an extension plate at its two free ends. The two bands are fitted around the periphery of the prestressed cable to be dismantled, and the two extension plates at the same free end are connected as a whole by bolts. The difference between the width of the band and the elongation of the prestressed cable to be dismantled is not less than 50 cm.

4. The pre-stressed cable removal protection device of claim 3, wherein, The connector includes multiple connecting plates, which are spaced apart along the axial direction of the prestressed cable to be dismantled. Any connecting plate is detachably connected to the extension plate, and any connecting plate is arranged perpendicular to the axial direction of the prestressed cable to be dismantled.

5. The pre-stressed cable removal protection device of claim 4, wherein, The number of connecting plates is set to 2% to 20% of the tension of the prestressed cable to be dismantled.

6. The pre-stressed cable removal protection device of claim 3, wherein, The inner wall of the hoop is provided with threaded ribs.

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