Steel strand stay cable hdpe outer sleeve jacking device and method of use thereof

Abstract

The application relates to a steel strand cable stay HDPE outer sleeve pipe jacking device and a use method thereof, and belongs to the technical field of bridges. The device comprises a pull plate, the pull plate is arranged on the side surface of a beam end cable guide pipe, a jacking rod assembly is arranged on the pull plate, the top of the jacking rod assembly is supported on the bottom of a waterproof cover, a first fixing rope is arranged below the pipe opening of the beam end cable guide pipe, a hoist is arranged between the first fixing rope and the pull plate, the hoist drives the pull plate and the jacking rod assembly to be lifted, the jacking rod assembly moves upwards against the waterproof cover and the HDPE outer sleeve pipe, and the distance requirement between the waterproof cover and the pipe opening of the beam end cable guide pipe is met. The application is installed below the pipe opening of the beam end cable guide pipe, has a simple structure, is convenient to install and disassemble, does not need tower outer hanging basket construction, avoids high-altitude operation, improves safety, has low cost, and saves time and manpower.

Description

Technical Field

[0001] This invention relates to a lifting device for HDPE outer tube of steel strand stay cable and its application method, belonging to the field of bridge technology. Background Technology

[0002] During the cable-stayed system of a single steel strand, the HDPE outer sheath is typically hoisted and temporarily fixed at the tower end using clamps. This ensures sufficient space between the HDPE outer sheath and the cable duct openings at both the tower and beam ends for cable insertion. Figure 1 As shown. The tensioning of stay cables is generally divided into multiple tensioning stages, a process that takes a relatively long time. Therefore, after all the steel strands are threaded and initially tensioned, the clamps are removed and reused for the next cable number, achieving the purpose of reuse. After the clamps are removed, the HDPE outer casing and waterproof cover slide downwards to the cable guide pipe opening at the beam end due to their own weight, and the tower end extension pipe is temporarily positioned, as shown. Figure 2 As shown. After all the stay cables have completed all tensioning procedures, the HDPE outer casing and waterproof cover are lifted again to install the beam-end auxiliary components (cable clamps and built-in vibration dampers). Previously, clamps were installed at the tower end, and a hand-operated hoist was used to lift the HDPE outer casing. This method has the following drawbacks: 1) Because there is no operating platform outside the tower, a hanging basket is required for construction, which is costly, time-consuming, and labor-intensive; 2) The clamps are a two-part structure, fixed with bolts, making installation and disassembly inconvenient; 3) Working at height outside the tower poses significant safety hazards. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a lifting device for HDPE outer tube of steel strand cable stay and its usage method, which is simple in structure, convenient to install and dismantle, does not require external hanging basket construction, avoids high-altitude operation and improves safety.

[0004] The technical solution adopted by the present invention to solve the above problems is as follows: a lifting device for HDPE outer tube of a steel strand cable, including a pull plate, the pull plate being disposed on the side of the cable guide tube at the beam end, a top rod assembly being disposed on the pull plate, the top of the top rod assembly being supported at the bottom of the waterproof cover, a first fixing rope being disposed below the opening of the cable guide tube at the beam end, and a hoist being disposed between the first fixing rope and the pull plate, the hoist driving the pull plate and the top rod assembly to lift, so that the top rod assembly pushes the waterproof cover and the HDPE outer tube upward, thereby meeting the distance requirement between the waterproof cover and the opening of the cable guide tube at the beam end.

[0005] The top rod assembly includes two parallel top rods, each with a U-shaped groove at its top, and the bottom edge of the waterproof cover is located within the U-shaped groove.

[0006] The pull plate is an irregularly shaped pull plate with lifting holes. The irregularly shaped pull plate has symmetrical locking arms at both ends, and the top rod is mounted on the corresponding locking arm. The irregularly shaped pull plate also has an inwardly recessed limiting support, which is located inside the locking arm and has a limiting effect on the top rod. The irregularly shaped pull plate has lifting holes, and the hook of the hoist is hooked into the lifting holes.

[0007] The irregularly shaped pull plate is a mountain-shaped structural component or a W-shaped structural component.

[0008] The lifting equipment is a manual chain hoist or an electric hoist.

[0009] A method for using a lifting device for HDPE outer casing of a steel strand stay cable, the method comprising the following steps:

[0010] Step 1: Tie the first fixing rope to the lower part of the cable guide pipe at the beam end, and hang the hoist on the first fixing rope;

[0011] Step 2: Hang the lifting hole of the irregularly shaped pull plate on the hook of the hoist;

[0012] Step 3: The bottom of the two push rods are respectively fitted onto the corresponding clamping arms of the irregular pull plate, and the push rods are pressed against the limiting bearing platform;

[0013] Step 4: Start the hoist to move it up or down so that the U-shaped groove at the top of the top rod engages with the lower edge of the waterproof cover;

[0014] Step 5: Control the hoist to lift, which will drive the special-shaped pull plate and the top rod assembly to lift simultaneously, so that the top rod assembly moves upward against the waterproof cover and HDPE outer sleeve until the distance between the waterproof cover and the cable guide pipe opening at the beam end is sufficient for the installation of auxiliary components;

[0015] Step Six: After the jacking is in place, the jacking device and the beam end cable guide are temporarily fixed by tying the second fixing rope. The rope can be removed after the auxiliary components are installed.

[0016] Compared with the prior art, the advantages of the present invention are as follows: a lifting device for HDPE outer tube of steel strand cable stay and its usage method, the lifting device is installed below the cable guide pipe opening at the beam end, the structure is simple and easy to install and dismantle, no need for external hanging basket construction, avoids high-altitude operation and improves safety; low cost, and saves time and manpower. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the location of the HDPE outer casing of the stay cable during the cable-stayed construction phase.

[0018] Figure 2 A schematic diagram showing the position of the HDPE outer casing after the removal of the clamps used for hoisting the HDPE outer casing at the tower end following the completion of cable installation.

[0019] Figure 3 This is a schematic diagram of the initial installation of a steel strand cable stay HDPE outer tube lifting device according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the state of the HDPE outer tube after being lifted by a lifting device for a steel strand cable HDPE outer tube according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the push rod;

[0022] Figure 6 This is a schematic diagram of an irregularly shaped pull plate;

[0023] The diagram shows: 1. Beam end cable guide pipe; 2. Lifting device; 21. Top rod; 211. U-shaped slot; 22. Hoist; 23. Irregular tie plate; 231. Lifting hole; 232. Clamping arm; 233. Limiting bearing platform; 24. First fixing rope; 25. Second fixing rope; 3. Waterproof cover; 4. HDPE outer sleeve. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] like Figure 3 , 5 As shown in Figure 6, a lifting device for an HDPE outer casing of a steel strand cable in this embodiment includes a shaped pull plate 23, which is located on the side of the cable guide 1 at the beam end. A lifting hole 231 is provided on the shaped pull plate 23, and clamping arms 232 are symmetrically arranged at both ends of the shaped pull plate 23. A symmetrically recessed limiting support platform 233 is also provided on the shaped pull plate 23, and the limiting support platform 233 is located inside the clamping arm 232. Top rods 21 are respectively fitted onto the clamping arms 232, so that the two top rods 21 are arranged in parallel, and the bottom of the top rods 21 is supported on the limiting support platform 233. U-shaped grooves 211 are respectively provided on the top of the top rods 21, and the bottom edge of the waterproof cover 3 is located within the U-shaped grooves 211. A first fixing rope 24 is tied below the opening of the cable guide 1 at the beam end, and a hoist 22 is installed on the first fixing rope 24. The hook of the hoist 22 hooks onto the lifting hole 231. The hoist 22 drives the special-shaped pull plate 23 and the top rod 21 to lift simultaneously, so that the top rod 21 pushes the waterproof cover 3 and HDPE outer sleeve 4 upward until the distance between the waterproof cover 3 and the pipe opening of the beam end cable guide 1 meets the space for installing auxiliary components, and then the hoist 22 stops working.

[0026] The U-shaped slot 211 at the top of the top rod 21 is uneven on the left and right sides, which facilitates installation and prevents slippage.

[0027] The irregularly shaped pull plate 23 is a mountain-shaped structural component or a W-shaped structural component.

[0028] The lifting equipment is a manual chain hoist or an electric hoist.

[0029] A method for using a lifting device for HDPE outer casing of a steel strand stay cable includes the following steps:

[0030] Step 1: Tie the first fixing rope to the bottom of the cable guide pipe at the beam end, and hang the top of the hoist on the first fixing rope. At this time, the hoist is perpendicular to the beam surface.

[0031] Step 2: Hang the lifting hole of the irregularly shaped pull plate on the hook of the hoist.

[0032] Step 3: The bottom of the two push rods are respectively fitted onto the corresponding clamping arms of the irregular pull plate, and the push rods are pressed against the limiting bearing platform.

[0033] Step 4: Start the hoist to move it up or down so that the U-shaped groove at the top of the top rod engages with the lower edge of the waterproof cover.

[0034] Step 5: The hoist hook moves upward, driving the special-shaped tie plate and top rod to rise simultaneously. This causes the top rod to move upward against the waterproof cover and HDPE outer sleeve until the distance between the waterproof cover and the cable guide pipe opening at the beam end is sufficient for installing auxiliary components. At this point, the hoist stops operating.

[0035] Step Six: As Figure 4 As shown, after the jacking is in place, the jacking device 2 and the beam end cable guide 1 are temporarily fixed by tying the second fixing rope. The two can be removed after the auxiliary components are installed.

[0036] This application is installed below the cable guide pipe opening at the beam end. It has a simple structure, is easy to install and dismantle, does not require external tower hanging basket construction, avoids high-altitude operations, and improves safety; it is low in cost and saves time and manpower.

[0037] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A method for using a lifting device for an HDPE outer casing of a steel strand stay cable, characterized in that: The method of use is based on a lifting device, which includes a pull plate located on the side of the beam end cable guide tube. A top rod assembly is installed on the pull plate, with the top of the top rod assembly supported at the bottom of the waterproof cover. A first fixing rope is installed below the opening of the beam end cable guide tube. A hoist is installed between the first fixing rope and the pull plate. The hoist drives the pull plate and the top rod assembly to lift, so that the top rod assembly pushes the waterproof cover and HDPE outer sleeve upward, thereby meeting the distance requirement between the waterproof cover and the opening of the beam end cable guide tube. The top rod assembly includes two parallel top rods, each with a U-shaped groove at its top, and the bottom edge of the waterproof cover is located within the U-shaped groove. The pull plate is an irregularly shaped pull plate with lifting holes. Symmetrical locking arms are provided at both ends of the irregularly shaped pull plate, and the top rod is mounted on the corresponding locking arm. The irregularly shaped pull plate also has an inwardly recessed limiting support, located inside the locking arm, which limits the position of the top rod. The lifting holes are provided on the irregularly shaped pull plate, and the hook of the hoist is hooked into the lifting holes. The method of use includes the following steps: Step 1: Tie the first fixing rope to the lower part of the cable guide pipe at the beam end, and hang the hoist on the first fixing rope; Step 2: Hang the lifting hole of the irregularly shaped pull plate on the hook of the hoist; Step 3: The bottom of the two push rods are respectively fitted onto the corresponding clamping arms of the irregular pull plate, and the push rods are pressed against the limiting bearing platform; Step 4: Start the hoist to move it up or down so that the U-shaped groove at the top of the top rod engages with the lower edge of the waterproof cover; Step 5: Control the hoist to lift, which will drive the special-shaped pull plate and the top rod assembly to lift simultaneously, so that the top rod assembly moves upward against the waterproof cover and HDPE outer sleeve until the distance between the waterproof cover and the cable guide pipe opening at the beam end is sufficient for the installation of auxiliary components; Step Six: After the jacking is in place, the jacking device and the beam end cable guide are temporarily fixed by tying the second fixing rope. The rope can be removed after the auxiliary components are installed.

2. The method of using the HDPE outer casing lifting device for steel strand stay cables according to claim 1, characterized in that: The irregularly shaped pull plate is a mountain-shaped structural component or a W-shaped structural component.

3. The method of using the HDPE outer casing lifting device for steel strand stay cables according to claim 1, characterized in that: The hoist is either a manual chain hoist or an electric hoist.

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