Dismantling method of steel wire horizontal cable

Abstract

The invention discloses a steel wire horizontal cable dismantling method which comprises the following steps that a horizontal cable section is selected, and the horizontal cable section comprises a tensioning clamp installation section and a reserved tensioning section; stripping the PE sheath of the mounting section of the tensioning clamp, and exposing the internal steel wire bundle; tensioning clamps are installed at the two ends of the PE sheath of the tensioning clamp installation section, each tensioning clamp comprises a clamp body clamped outside the PE sheath and a tensioning anchor seat welded to the clamp body, a gap is formed between the clamp body and the exposed steel wire bundle, and the interior of the gap is solidified through a shear key and a bonding material; a tensioning system is installed on the tensioning anchor base, and the two sides are tensioned synchronously through the tensioning system till the reserved tensioning section is loosened; the loose steel wire bundle of the reserved tensioning section is cut; and releasing and detaching the horizontal cable. The stress of the horizontal cable to be replaced can be slowly released, and the construction difficulty and the safety risk are reduced.

Description

Technical Field

[0001] The present invention relates to the fields of bridge maintenance, repair, and installation of large equipment. More specifically, the present invention relates to a method for removing a steel wire horizontal cable. Background Art

[0002] With the operation of bridges, bridges need to be regularly maintained and repaired. For the steel wire horizontal cables on bridges, the designed service life is generally 20 years. However, in actual use, the actual service life of the horizontal cables is affected by various factors, including design level, materials, manufacturing technology, installation quality, live load control, bridge site environment, and maintenance monitoring. Often, before reaching the designed service life, maintenance, repair, or replacement is required.

[0003] However, due to the stress existing in the horizontal cable, when the horizontal cable is cut, due to the rapid release of stress, it seriously threatens the structural safety of the bridge and the personal safety of construction workers. As a result, during the construction process of removing the horizontal cable, the work is difficult and the safety risk is high. Currently, there is no efficient and reliable removal method. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for removing a steel wire horizontal cable, so that the stress of the horizontal cable to be replaced can be slowly released, reducing the construction difficulty and safety risk.

[0005] The technical solution adopted by the present invention to solve this technical problem is: to provide a method for removing a steel wire horizontal cable, including the following steps: Step 1: Select a horizontal cable section, where the horizontal cable section includes a tensioning fixture installation section and a reserved tensioning section, and the length A of the reserved tensioning section satisfies A≥50 cm + B, where B is the elongation of the horizontal cable during tensioning; Step 2: Strip the PE sheath of the tensioning fixture installation section to expose the internal steel wire bundle, where the stripping length is L; Step 3: Install tensioning fixtures at both ends of the PE sheath of the tensioning fixture installation section. The tensioning fixture includes a fixture clamped outside the PE sheath and a tensioning anchor seat welded to the fixture. The clamping length at both ends of the fixture is 5 cm each, and the total length is 10 cm + L, and a gap is formed between the fixture and the exposed steel wire bundle. The gap is consolidated through shear keys and bonding materials; Step 4: Install a tensioning system on the tensioning anchor seat, and synchronously tension both sides through the tensioning system until the reserved tensioning section is relaxed; Step 5: Cut the steel wire bundle of the relaxed reserved tensioning section; Step 6: Release the tension and remove the horizontal cable.

[0006] Preferably, for the method of removing the steel wire horizontal cable, the tensioning anchor seat includes an anchor plate and a stiffening plate. The anchor plate is provided with mounting holes for connecting the tensioning system, and the stiffening plates are evenly welded along the circumference of the anchor plate.

[0007] Preferably, for the method of removing the steel wire horizontal cable, the tensioning system includes a tension rod, a support foot, a through-hole jack and an anchor bolt; The tension rod passes through the mounting hole on the tensioning anchor seat and is fixed by the anchor bolt. One end of the support foot is connected to the tensioning anchor seat, and the other end is connected to the through-hole jack. The through-hole jack is sleeved outside the tension rod.

[0008] Preferably, for the method of removing the steel wire horizontal cable, the stroke of the through-hole jack is not less than the elongation B of the horizontal cable in the reserved tensioning section.

[0009] Preferably, for the method of removing the steel wire horizontal cable, the shear keys are evenly distributed on the inner wall of the fixture along the length direction of the gap, and the shear keys extend into the bonding material.

[0010] Preferably, for the method of removing the steel wire horizontal cable, the bonding material is zinc-copper alloy, epoxy iron sand or a material with a bonding strength ≥ 2.5 MPa and a friction coefficient ≥ 0.25.

[0011] Preferably, for the method of removing the steel wire horizontal cable, the fixture is also provided with perfusion holes, which are evenly arranged along the axial direction of the fixture, and the adhesive material is injected into the gap through the perfusion holes.

[0012] Preferably, for the method of removing the steel wire horizontal cable, the fixture is composed of two symmetrically arranged arc-shaped clamping plates. The inner diameter of the clamping plate matches the outer diameter of the horizontal cable and is clamped by bolt connection.

[0013] Preferably, for the method of removing the steel wire horizontal cable, in the second step, the stripping length L satisfies: , where K is the safety factor, is the total tension of the horizontal cable, μ is the friction coefficient, P is the clamping stress of the cable, and r is the radius of the horizontal cable.

[0014] The present invention has at least the following beneficial effects: 1. It can cut and remove the steel wire horizontal cable in a stress-free state, avoiding construction hazards caused by the ejection of steel wires during the cutting process.

[0015] 2. After the cable body is cut and removed, the internal stress of the horizontal cable can be slowly released, reducing the structural safety risk caused by the rapid release of stress.

[0016] Other advantages, objectives and features of the present invention will be partly reflected by the following description and partly understood by those skilled in the art through the research and practice of the present invention. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of a horizontal cable section in a method for removing a steel wire horizontal cable of the present invention; Figure 2 It is a cross-sectional view of a horizontal cable section in a method for removing a steel wire horizontal cable of the present invention; Figure 3 It is a schematic diagram of the section division of a horizontal cable section and PE stripping in a method for removing a steel wire horizontal cable of the present invention; Figure 4 It is a front view of the installation of a tensioning fixture in a method for removing a steel wire horizontal cable of the present invention; Figure 5 It is a side view of the installation of a tensioning fixture in a method for removing a steel wire horizontal cable of the present invention; Figure 6 It is a schematic diagram of the installation of a tensioning system and tensioning on a tensioning fixture of a horizontal cable section in a method for removing a steel wire horizontal cable of the present invention; Description of the reference numerals in the drawings: 1. Horizontal cable section, 11. Tensioning fixture installation section, 12. Reserved tensioning section, 2. PE sheath, 3. Steel wire bundle, 4. Tensioning fixture, 41. Tensioning anchor seat, 411. Anchor plate, 412. Stiffening plate, 42. Fixture, 421. Shear key, 422. Grouting hole, 43. Bonding material, 5. Tensioning system, 51. Tension rod, 52. Support foot, 53. Jack with hole, 54. Anchor bolt. Detailed Description of the Invention

[0018] The present invention will be described in detail and completely below with reference to the drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in combination with the drawings, it should be particularly noted that: the technical solutions and technical features provided in each part including the following description can be combined with each other without conflict.

[0019] In addition, the embodiments of the present invention involved in the following description are usually only part of the embodiments of the present invention, rather than all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts should fall within the scope of protection of the present invention.

[0020] The following further describes the present invention in detail with reference to the drawings and embodiments, and the specific implementation process is as follows: As Figures 1-6As shown, the present invention provides a method for removing a horizontal steel wire rope, comprising the following steps: Step 1: Select a horizontal cable segment 1 that is convenient for on-site construction. The horizontal cable is wrapped with a PE sheath 2 and has a steel wire bundle 3 inside. It is planned to cut and remove the horizontal cable segment 1. The cable segment has a certain length. The horizontal cable segment 1 includes a tensioning fixture installation segment 11 and a reserved tensioning segment 12. The length A of the reserved tensioning segment 12 satisfies A≥50cm+B, where B is the tensioning elongation of the horizontal cable; in , F is the total tension of the horizontal cable, L is the stress-free length of the cable; E is the elastic modulus of the steel wire, and A is the total cross-sectional area of ​​the steel wire.

[0021] Step 2: stripping off the PE sheath 2 of the tensioning fixture installation section 11 to expose the internal steel wire bundle 3, wherein the stripping length is L; Step 3: Install the tensioning clamp 4 at both ends of the PE sheath of the tensioning clamp installation section 11, and perform standardized processing inside the factory. The tensioning clamp 4 includes a clamp 42 clamped on the outside of the PE sheath 2 and a tensioning anchor seat 41 welded to the clamp 42. The clamping lengths of both ends of the clamp 42 are 5 cm each, and the total length is 10 cm + L. A gap is formed between the clamp 42 and the exposed steel wire bundle 3, and the gap is consolidated by a shear key 421 and an adhesive material 43; Step 4: Install the tensioning system 5 on the tensioning anchor 41, and tension the two sides synchronously through the tensioning system 5 until the reserved tensioning section 12 is relaxed; the tensioning system 5 is stressed, and the tensioning rods 51 are tensioned synchronously on both sides, and the tensioning rods 51 are lifted by the through-hole jack 53, so that the elongation of the reserved tensioning section 12 of the horizontal cable begins to retract, until the lifting force of the jack reaches the designed tension of the horizontal cable or the reserved tensioning section 12 is relaxed or the strain gauge no longer changes, which proves that the tensioning is in place. The cable force at this time is the actual cable force of the horizontal cable.

[0022] Step 5: Cut the relaxed steel wire bundle 3 of the reserved tensioning section 12; cut the horizontal cable. After the tensioning is completed, the reserved tensioning section 12 is in a relaxed state. Use an angle grinder to peel off the PE sheath 2 at the reserved tensioning section 12, and then use a cutting machine to cut off the steel wire bundle 3.

[0023] Step 6: Release and remove the horizontal cables. The tension rod 51 is released, and the through-hole jack 53 is used to release the tension synchronously up and down until the tension rod 51 is completely relaxed, and then all the horizontal cables are removed in sections, and the removal of all the steel wire horizontal cables is completed.

[0024] Furthermore, in the method for removing the horizontal steel wire rope, the tensioning anchor seat 41 includes an anchor plate 411 and a stiffening plate 412 , the anchor plate 411 is provided with a mounting hole for connecting the tensioning system 5 , and the stiffening plate 412 is uniformly welded along the circumference of the anchor plate 411 .

[0025] Further, for the method of removing the steel wire horizontal cable, the tensioning system 5 includes a tension rod 51, a support foot 52, a through-hole jack 53 and an anchor bolt 54; The tension rod 51 passes through the installation hole on the tensioning anchor seat 41 and is fixed by the anchor bolt 54. One end of the support foot 52 is connected to the tensioning anchor seat 41, and the other end is connected to the through-hole jack 53. The through-hole jack 53 is sleeved outside the tension rod 51.

[0026] Further, for the method of removing the steel wire horizontal cable, the stroke of the through-hole jack 53 is not less than the horizontal cable tensile elongation B of the reserved tensioning section 12.

[0027] Further, for the method of removing the steel wire horizontal cable, the shear keys 421 are evenly distributed along the length direction of the gap on the inner wall of the fixture 42 and the shear keys 421 extend into the bonding material 43. The presence of the shear keys 421 makes the cooperation between the tensioning fixture 4 and the steel wire bundle 3 more effective.

[0028] Further, for the method of removing the steel wire horizontal cable, the bonding material 43 is zinc copper alloy, epoxy iron sand or a material with a bonding strength ≥ 2.5 MPa and a friction coefficient ≥ 0.25.

[0029] Further, for the method of removing the steel wire horizontal cable, the fixture 42 is also provided with perfusion holes 422. The perfusion holes 422 are evenly arranged along the axis of the fixture 42. The bonding material 43 is injected into the gap through the perfusion holes 422 to fully connect the tensioning fixture 4 and the exposed steel wire bundle 3.

[0030] Further, for the method of removing the steel wire horizontal cable, the fixture 42 is composed of two symmetrically arranged arc-shaped clamping plates. The inner diameter of the clamping plate matches the outer diameter of the horizontal cable, and the PE sheath 2 is clamped by bolt connection to form a filling gap with the steel wire bundle 3.

[0031] Further, for the method of removing the steel wire horizontal cable, in the second step, the stripping length L satisfies: , where K is the safety factor, is the total tension of the horizontal cable, μ is the friction coefficient, P is the cable clamping stress, and r is the radius of the horizontal cable.

[0032] Although the embodiments of the present invention have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the embodiments shown and described here.

Claims

1. A method for removing a horizontal steel wire cable, characterized in that, It includes the following steps: Step 1: Select a horizontal cable segment, which includes a tensioning fixture installation segment and a reserved tensioning segment. The length A of the reserved tensioning segment satisfies A≥50 cm + B, where B is the elongation of the horizontal cable during tensioning. Step 2: Strip the PE sheath of the tensioning fixture installation segment to expose the internal steel wire bundle, where the stripping length is L. Step 3: Install tensioning fixtures at both ends of the PE sheath of the tensioning fixture installation segment. The tensioning fixture includes a fixture clamped outside the PE sheath and a tensioning anchor seat welded to the fixture. The clamping length at both ends of the fixture is 5 cm each, and the total length is 10 cm + L, and a gap is formed between the fixture and the exposed steel wire bundle. The gap is consolidated by shear keys and bonding materials. Step 4: Install a tensioning system on the tensioning anchor seat, and synchronously tension both sides through the tensioning system until the reserved tensioning segment is slack. Step 5: Cut the steel wire bundle of the slack reserved tensioning segment. Step 6: Release the tension and remove the horizontal cable.

2. The method for removing the horizontal steel wire cable according to claim 1, characterized in that, The tensioning anchor seat includes an anchor plate and stiffening plates. The anchor plate is provided with installation holes for connecting the tensioning system, and the stiffening plates are evenly welded along the circumference of the anchor plate.

3. The method for removing the horizontal steel wire cable according to claim 1, characterized in that The tensioning system includes a tensioning rod, a support foot, a hole-through jack, and an anchor bolt. The tensioning rod passes through the installation hole on the tensioning anchor seat and is fixed by the anchor bolt. One end of the support foot is connected to the tensioning anchor seat, and the other end is connected to the hole-through jack. The hole-through jack is sleeved outside the tensioning rod.

4. The method for removing the horizontal steel wire cable according to claim 3, characterized in that, The stroke of the hole-through jack is not less than the elongation B of the horizontal cable in the reserved tensioning segment during tensioning.

5. The method for removing the horizontal steel wire cable according to claim 1, characterized in that The shear keys are evenly distributed along the length direction of the gap on the inner wall of the fixture and the shear keys extend into the bonding material.

6. The method for removing the horizontal steel wire cable according to claim 1, characterized in that, The bonding material is zinc copper alloy, epoxy iron sand, or a material with a bonding strength ≥2.5 MPa and a friction coefficient ≥0.

25.

7. The demolition method of the horizontal steel wire cable according to claim 1, characterized in that, The fixture is also provided with perfusion holes, which are evenly arranged along the axial direction of the fixture. The bonding material is injected into the gap through the perfusion holes.

8. The method for removing the horizontal steel wire cable according to claim 1, characterized in that, The fixture is composed of two symmetrically arranged arc-shaped clamping plates. The inner diameter of the clamping plates matches the outer diameter of the horizontal cable and is clamped and connected by bolts.

9. The method for removing the horizontal steel wire cable according to claim 1, characterized in that, In the second step, the stripping length L satisfies: , where K is the safety factor, is the total tension of the horizontal cable, μ is the friction coefficient, P is the clamping stress of the cable, and r is the radius of the horizontal cable.

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