Method for dismantling a steel wire horizontal cable

Abstract

The application discloses a steel wire horizontal cable dismantling method, comprising the following steps: selecting a horizontal cable section, the horizontal cable section comprising a tensioning clamp mounting section and a reserved tensioning section; stripping the PE sheath of the tensioning clamp mounting section to expose the internal steel wire bundle; installing tensioning clamps at both ends of the PE sheath of the tensioning clamp mounting section, the tensioning clamp comprising a clamp clamped outside the PE sheath and a tensioning anchor base welded with the clamp, a gap being formed between the clamp and the exposed steel wire bundle, the gap being consolidated by a shear key and adhesive material; installing a tensioning system on the tensioning anchor base, synchronously tensioning both sides by the tensioning system until the reserved tensioning section is relaxed; cutting the steel wire bundle of the relaxed reserved tensioning section; and releasing tension and dismantling the horizontal cable. The application slowly releases the stress of the horizontal cable to be replaced, and reduces the construction difficulty and safety risk.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge maintenance, repair and large equipment installation. More particularly, the present application relates to a method for removing steel wire horizontal cable. BACKGROUND

[0002] With the operation of the bridge, the bridge needs to be regularly maintained and repaired. For the steel wire horizontal cable on the bridge, the design life is generally 20 years, but in the actual use process, the actual service life of the horizontal cable is affected by many factors, including design level, material, manufacturing technology, installation quality, live load control, bridge site environment and maintenance monitoring, etc., and often needs to be maintained and repaired or replaced before reaching the design life.

[0003] However, since there is stress in the horizontal cable, when the horizontal cable is cut, the stress is released rapidly, which seriously threatens the structural safety of the bridge and the personal safety of the construction personnel. Therefore, in the process of removing the horizontal cable, the work is difficult and the safety risk is high, and there is currently no efficient and reliable method for removing the horizontal cable. SUMMARY

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

[0005] The technical solution adopted by the present application to solve the technical problem is to provide a method for removing a steel wire horizontal cable, comprising the following steps:

[0006] Step 1: Select a horizontal cable section, the horizontal cable section includes a tension clamp installation section and a reserved tension section, wherein the length A of the reserved tension section satisfies A≥50cm +B, B is the horizontal cable tension elongation;

[0007] Step 2: Remove the PE sheath of the tension clamp installation section to expose the internal steel wire bundle, wherein the removal length is L;

[0008] Step 3: Install tension clamps at both ends of the PE sheath of the tension clamp installation section, the tension clamps include clamps clamped outside the PE sheath and tension anchors welded with the clamps, the clamping length of both ends of the clamp is 5cm, the total length is 10cm +L, and a gap is formed between the exposed steel wire bundle, the gap is consolidated by shear keys and adhesive materials;

[0009] Step 4: Install a tensioning system on the tension anchor, and synchronously tension both sides by the tensioning system until the reserved tension section is relaxed;

[0010] Step 5: Cut the steel wire bundle of the relaxed reserved tension section;

[0011] Step 6: release the tension and remove the horizontal cable.

[0012] Preferably, the steel wire horizontal cable dismantling method, the tensioning anchor base comprises an anchor plate and a stiffening plate, the anchor plate is provided with a mounting hole for connecting the tensioning system, and the stiffening plate is uniformly welded along the circumference of the anchor plate.

[0013] Preferably, the steel wire horizontal cable dismantling method, the tensioning system comprises a tensioning rod, a support leg, a through jack and an anchoring bolt.

[0014] The tensioning rod passes through the mounting hole on the tensioning anchor base and is fixed by the anchoring bolt, one end of the support leg is connected with the tensioning anchor base, the other end is connected with the through jack, and the through jack is sleeved outside the tensioning rod.

[0015] Preferably, the steel wire horizontal cable dismantling method, the stroke of the through jack is not less than the horizontal cable tensioning elongation B of the reserved tensioning section.

[0016] Preferably, the steel wire horizontal cable dismantling method, the shear keys are uniformly distributed on the inner wall of the clamp along the length direction of the gap, and the shear keys extend into the adhesive material.

[0017] Preferably, the steel wire horizontal cable dismantling method, the adhesive material is zinc-copper alloy, epoxy iron sand or a material with a bonding strength greater than or equal to 2.5 MPa and a friction coefficient greater than or equal to 0.25.

[0018] Preferably, the steel wire horizontal cable dismantling method, the clamp is also provided with a pouring hole, the pouring hole is uniformly arranged along the axial direction of the clamp, and the adhesive material is injected into the gap through the pouring hole.

[0019] Preferably, the steel wire horizontal cable dismantling method, the clamp is composed of two symmetrical arc-shaped clamping plates, the inner diameter of the clamping plate matches the outer diameter of the horizontal cable, and the clamping plate is clamped by bolts.

[0020] Preferably, the steel wire horizontal cable dismantling method, wherein in step two, the stripping length L satisfies: , wherein K is a safety factor, is the total tension of the horizontal cable, mu is the friction coefficient, P is the cable stress, and r is the horizontal cable radius.

[0021] The present application at least includes the following beneficial effects:

[0022] 1. The steel wire horizontal cable can be cut and removed in a stress-free state, avoiding the construction danger caused by steel wire ejection during cutting.

[0023] 2. The cable body can be cut and removed, and the internal stress of the horizontal cable can be slowly released, reducing the structural safety risk caused by rapid stress release.

[0024] Other advantages, objects, and features of the application will be better understood from the following description taken in conjunction with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A schematic view of a horizontal cable segment in a method for dismantling a steel wire horizontal cable according to the present application;

[0026] Figure 2 A sectional view of a horizontal cable segment in a method for dismantling a steel wire horizontal cable according to the present application;

[0027] Figure 3 A schematic view of horizontal cable segment segmentation and PE stripping in a method for dismantling a steel wire horizontal cable according to the present application;

[0028] Figure 4 A front view of tension clamp installation in a method for dismantling a steel wire horizontal cable according to the present application;

[0029] Figure 5 A side view of tension clamp installation in a method for dismantling a steel wire horizontal cable according to the present application;

[0030] Figure 6 A schematic view of tension system installation and tensioning on a tension clamp of a horizontal cable segment in a method for dismantling a steel wire horizontal cable according to the present application;

[0031] The reference signs are as follows: 1, horizontal cable segment; 11, tension clamp installation segment; 12, reserved tensioning segment; 2, PE sheath; 3, steel wire bundle; 4, tension clamp; 41, tension anchor; 411, anchor plate; 412, stiffening plate; 42, clamp; 421, shear key; 422, pouring hole; 43, adhesive material; 5, tension system; 51, tension rod; 52, support foot; 53, through jack; 54, anchoring bolt. DETAILED DESCRIPTION

[0032] The present application will be described in detail below with reference to the drawings. Those skilled in the art can implement the present application based on the description. Before the present application is disclosed with reference to the drawings, it is to be noted that the technical solutions and technical features provided in each part of the present application, including the following description, can be combined with each other without conflict.

[0033] In addition, the embodiments of the present application involved in the following description are generally only a part of the embodiments of the present application, not all. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor should belong to the scope of protection of the present application.

[0034] The application is further described in detail below in conjunction with the accompanying drawings and examples, and the specific implementation process is as follows:

[0035] As shown in the drawings, the application provides a method for dismantling a steel wire horizontal cable, comprising the following steps: Figures 1-6

[0036] Step one: select a horizontal cable section 1 that is convenient for on-site construction, the horizontal cable is wrapped with a PE sheath 2, and the inside is a steel wire bundle 3, which is intended to be cut and dismantled at the horizontal cable section 1, the cable section has a certain length, and the horizontal cable section 1 includes a tensioning clamp installation section 11 and a reserved tensioning section 12, wherein the length A of the reserved tensioning section 12 satisfies A≥50cm +B, and B is the horizontal cable tension elongation;

[0037] Wherein , F is the total tension of the horizontal cable, L is the unstressed 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.

[0038] Step two: remove the PE sheath 2 of the tensioning clamp installation section 11 to expose the internal steel wire bundle 3, wherein the removal length is L;

[0039] Step three: install tensioning clamps 4 at both ends of the PE sheath of the tensioning clamp installation section 11, which are standardized processed inside the factory, the tensioning clamp 4 includes a clamp 42 clamped outside the PE sheath 2 and a tensioning anchor 41 welded with the clamp 42, the clamping length of both ends of the clamp 42 is 5cm, the total length is 10cm +L, and a gap is formed between the exposed steel wire bundle 3, the gap is consolidated by shear keys 421 and adhesive materials 43;

[0040] Step four: install a tensioning system 5 on the tensioning anchor 41, and synchronously tension both sides through the tensioning system 5 until the reserved tensioning section 12 is relaxed; the tensioning system 5 is stressed, and both sides are synchronously tensioned by tensioning rods 51, the tensioning rod 51 is jacked up by a through-center jack 53, so that the elongation of the horizontal cable reserved tensioning section 12 begins to retract, until the jack jacking force reaches the design cable force 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. At this time, the cable force is the actual cable force of the horizontal cable.

[0041] Step five: cut the steel wire bundle 3 of the relaxed reserved tensioning section 12; after tensioning, the reserved tensioning section 12 is in a relaxed state, the PE sheath 2 at the reserved tensioning section 12 is peeled off using an angle grinder, and then the steel wire bundle 3 is cut off using a cutting machine.

[0042] ​Step six: release and remove the horizontal cable. Release the tension rod 51, use the through jack 53 to release the tension synchronously, until the tensioned rod 51 is in a fully relaxed state, then remove all horizontal cables in sections, and the steel wire horizontal cable is completely removed.

[0043] Further, the steel wire horizontal cable removal method, the tension anchor 41 includes an anchor plate 411 and a stiffener plate 412, the anchor plate 411 is provided with a mounting hole for connecting the tensioning system 5, and the stiffener plate 412 is uniformly welded along the circumference of the anchor plate 411.

[0044] Further, the steel wire horizontal cable removal method, the tensioning system 5 includes a tension rod 51, a support foot 52, a through jack 53 and an anchor bolt 54;

[0045] The tension rod 51 passes through the mounting hole on the tension anchor 41 and is fixed by the anchor bolt 54, one end of the support foot 52 is connected with the tension anchor 41, and the other end is connected with the through jack 53, and the through jack 53 is sleeved outside the tension rod 51.

[0046] Further, the steel wire horizontal cable removal method, the stroke of the through jack 53 is not less than the horizontal cable tension elongation B of the reserved tensioning section 12.

[0047] Further, the steel wire horizontal cable removal method, the shear keys 421 are uniformly distributed on the inner wall of the clamp 42 along the gap length direction and the shear keys 421 extend into the adhesive material 43, and the existence of the shear keys 421 makes the tension clamp 4 and the steel wire bundle 3 have a higher degree of cooperative stress.

[0048] Further, the steel wire horizontal cable removal method, the adhesive material 43 is zinc-copper alloy, epoxy iron sand or a material with a bonding strength ≥2.5MPa and a friction coefficient ≥0.25.

[0049] Further, the steel wire horizontal cable removal method, the clamp 42 is further provided with a pouring hole 422, the pouring hole 422 is uniformly arranged along the axial direction of the clamp 42, and the adhesive material 43 is injected into the gap through the pouring hole 422, so that the tension clamp 4 and the exposed steel wire bundle 3 are fully connected.

[0050] Further, the steel wire horizontal cable removal method, the clamp 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 clamping plate is connected and clamped to the PE sheath 2 through a bolt, forming a filling gap between the steel wire bundle 3.

[0051] Further, the steel wire horizontal cable removal method, in step two, the stripping length L satisfies: Where K is a safety factor, where T is the total tension in the horizontal cable, μ is the coefficient of friction, P is the cable stress, and r is the radius of the horizontal cable.

[0052] While embodiments of the application have been disclosed in connection with the above specification and drawings this description is not intended to limit the scope of the application and many modifications, enhancements, alternatives, and variations will become apparent to those skilled in the art from this disclosure. Accordingly, it is expressly intended that the description should not limit the application as claimed but rather the only limitation placed on the scope of the application be the accompanying claims and equivalents thereof.

Claims

1. A method for dismantling a horizontal steel wire cable, characterized in that, Includes the following steps: Step 1: Select a horizontal cable segment, which includes a tensioning clamp installation segment and a reserved tensioning segment, wherein the length A of the reserved tensioning segment satisfies A≥50cm+B, and B is the elongation of the horizontal cable tensioning. Step 2: Remove the PE sheath from the tensioning clamp installation section to expose the internal steel wire bundle, with a removal length of L; Step 3: Install tensioning clamps at both ends of the PE sheath of the tensioning clamp installation section. The tensioning clamps include clamps that clamp the outside of the PE sheath and tensioning anchors welded to the clamps. The clamping length at each end of the clamp is 5cm, and the total length is 10cm+L, forming a gap with the exposed steel wire bundle. The gap is fixed by shear keys and adhesive material. The adhesive material is a zinc-copper alloy. The shear keys are evenly distributed on the inner wall of the clamp along the length of the gap and extend into the adhesive material. Step 4: Install the tensioning system on the tensioning anchor, and simultaneously tension both sides until the reserved tensioning section relaxes; Step 5: Cut the loosened pre-tensioned section of the steel wire bundle; Step 6: Release and remove the horizontal cable.

2. The method for removing the horizontal steel wire cable as described in claim 1, characterized in that, The tensioning anchor includes an anchor plate and a stiffening plate. The anchor plate is provided with mounting holes for connecting the tensioning system, and the stiffening plate is uniformly welded along the circumference of the anchor plate.

3. The method for removing the horizontal steel wire cable as described in claim 1, characterized in that, The tensioning system includes tension rods, support legs, through-hole jacks, and anchor bolts; The tension rod passes through the mounting hole on the tension anchor and is fixed by the anchor bolt. One end of the support leg is connected to the tension anchor and the other end is connected to the through jack. The through jack is sleeved on the outside of the tension rod.

4. The method for removing the horizontal steel wire cable as described in claim 3, characterized in that, The stroke of the through-hole jack shall not be less than the horizontal cable tension elongation B of the reserved tensioning section.

5. The method for removing the horizontal steel wire cable as described in claim 1, characterized in that, The fixture is also provided with injection holes, which are evenly arranged along the axial direction of the fixture, and the adhesive material is injected into the gap through the injection holes.

6. The method for removing the horizontal steel wire cable as described in claim 1, characterized in that, The clamp consists of two symmetrically arranged arc-shaped clamping plates, the inner diameter of which matches the outer diameter of the horizontal cable, and they are clamped together by bolts.

7. The method for removing the horizontal steel wire cable as described in claim 1, characterized in that, In step two, the peeling length L satisfies: Where K is the safety factor. Let ρ be the total tension of the horizontal cable, μ be the coefficient of friction, P be the cable stress, and r be the radius of the horizontal cable.

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