CN111549686A - Stay cable positioner and bridge stay cable replacing method - Google Patents
Stay cable positioner and bridge stay cable replacing method Download PDFInfo
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- CN111549686A CN111549686A CN202010406268.0A CN202010406268A CN111549686A CN 111549686 A CN111549686 A CN 111549686A CN 202010406268 A CN202010406268 A CN 202010406268A CN 111549686 A CN111549686 A CN 111549686A
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- Prior art keywords
- steel strand
- cable
- diameter section
- positioning
- stay cable
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention belongs to the technical field of engineering construction, and particularly relates to a stay cable positioner and a bridge stay cable replacing method. The positioning seat of the inhaul cable positioner is provided with through holes for the steel strands to penetrate through, the through holes and the steel strands are arranged in a one-to-one correspondence mode, and the through holes are arranged at intervals between adjacent through holes. When the guy cable is replaced, releasing the tension of the target steel strand 11 at the inner side of the structure; then, disassembling the target steel strand 11 with the tension removed in the step A, and simultaneously drawing a new steel strand 20; and tensioning the new steel strand 20 to complete the installation of the new steel strand 20. By adopting the positioner, the steel strands are respectively arranged at intervals, so that when the inhaul cable is replaced, an operator does not need to construct outside a structure, the personal safety of the operator can be effectively improved, and the replacement efficiency is obviously improved.
Description
Technical Field
The invention belongs to the technical field of engineering construction, and particularly relates to a stay cable positioner and a bridge stay cable replacing method.
Background
The inhaul cable is a tension member which is fixed on a structure by a plurality of steel strands through anchor assemblies at two ends. The anchoring section of the inhaul cable is a connecting section of the inhaul cable and the anchorage device assembly and is an inhaul cable anchoring part for transmitting cable force to the bridge structure; the transition section is a cable section from the inlet of the conduit to the mouth of the anchoring section; the free section is the cable body of acting as go-between outside anchor section, the changeover portion, and the outside of the cable body of acting as go-between of free section is wrapped with outer protecting casing usually, protects the cable body of acting as go-between to avoid atmospheric corrosion. The guide pipe is a pre-buried pipe which is arranged in the structure and is used for the stay cable to pass through. The front end of the anchor assembly within the conduit is typically provided with a locator to extrude and shape the steel strands making up the cable into a compact bundle to reduce the cable body volume and thus reduce the windage of the free section. When the guy cable is replaced, operators need to be arranged on the inner side and the outer side of the structure respectively, the operators on the outer side of the structure can detach the old steel strand after detaching the positioner and releasing the positioning of the old steel strand; after the new steel strand is pulled and tensioned, an operator positioned outside the structure needs to restore the positioner, and the replacement steps of the stay cable are complicated and the replacement efficiency is low. The two ends of a guy cable of the cable-stayed bridge are usually anchored on a bridge body and a bridge tower respectively, when the guy cable of the cable-stayed bridge is replaced by adopting the prior art, vehicles need to be limited to pass for protecting operating personnel, even if the situation is high, the operating personnel located on the bridge floor and the outer vertical surface of the bridge tower are still very dangerous because the communication between the operating personnel inside and outside the bridge body and inside and outside the bridge tower is not smooth and the height of the bridge tower is large.
Disclosure of Invention
The invention aims to provide a stay cable positioner and a bridge stay cable replacing method, which can improve the replacement efficiency of a stay cable and ensure that the replacement operation is safer.
In order to realize the purpose, the invention adopts the technical scheme that:
the utility model provides a cable locator, includes the positioning seat, is equipped with the via hole that supplies the steel strand wires to run through on the positioning seat, and the via hole is arranged and the interval arrangement between the adjacent via hole with the steel strand wires one-to-one.
The method for replacing the bridge stay cable by adopting the stay cable positioner comprises the following steps:
step A, releasing the tension of a target steel strand;
step B, disassembling the target steel strand from which the tensile force is removed in the step A, and simultaneously drawing a new steel strand;
and C, tensioning the new steel strand to complete the installation of the new steel strand.
Compared with the prior art, the invention has the following technical effects: the locator makes steel strand wires interval arrangement respectively, need not to dismantle the locator just like this and can realize the dismantlement and the change of target steel strand wires, when changing the cable promptly, the operation personnel need not to be under construction in the structure outside, can effectively promote construction operation personnel's personal safety, are showing simultaneously and promote change efficiency.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a schematic view of a positioner;
fig. 3 is a sectional view a-a in fig. 2.
In the figure: 10. the cable comprises a stay cable, 11 steel strands, 11a target steel strands, 20 locators, 21 positioning seats, 22 via holes, 23 positioning pipes, 24 bushings, 30 anchors and 31 guide pipes.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
The utility model provides a cable locator, includes positioning seat 21, is equipped with the via hole 22 that supplies steel strand wires 11 to run through on the positioning seat 21, and via hole 22 and steel strand wires 11 one-to-one arrange and interval arrangement between the adjacent via hole 22. As shown in fig. 3, the cable 10 is generally composed of a plurality of steel strands 11, and the through holes 22 are spaced apart from each other, so that the steel strands 11 are spaced apart from each other at the positioner 20. That is to say, there is no interaction force between adjacent steel strands 11, and the load-bearing of other steel strands 11 is not affected when each steel strand 11 is tensioned, released, pulled, replaced, etc.
When the cable is used, the number of the through holes 22 may also be greater than the number of the steel strands forming the cable 10, as long as each steel strand 11 passes through different through holes 22, and the steel strands 11 are positioned at intervals.
As shown in fig. 2, in this embodiment, the spacing between adjacent vias 22 decreases from adjacent anchor ends to distal anchor ends. Therefore, the distance between the steel strands 11 of the inhaul cable 10 at the free section is smaller, and wind resistance is reduced; the spacing between each steel strand 11 of cable 10 at the anchor section is great, is favorable to being under construction to single steel strand 11 of cable 10.
In order to protect the wall of the steel strand 11 and the via hole 22 and prevent the steel strand 11 and the via hole 22 from being damaged during rope threading or use, a flexible lining is laid on the inner wall surface of the via hole 22.
An annular bushing 24 made of a flexible material is provided outside the positioning socket 21. The annular bushing 24 is in clearance fit with the guide tube 31 to limit displacement of the cable body in the radial direction of the guide tube 31.
In this embodiment, the positioning seat 21 is formed by pouring concrete, the positioning tube 23 is disposed on the outer side of the positioning seat 21, the positioning tube 23 is made of metal, and the bushing 24 is sleeved on the positioning tube 23. Namely, the positioning tube 23 not only protects the integrity of the base body of the positioning base 21, but also realizes the reliable connection between the positioning base 21 and the bushing 24.
Specifically, as shown in fig. 2, the positioning tube 23 is in a stepped tubular shape, and the large diameter section is arranged adjacent to the side where the anchor is located, and the small diameter section is arranged away from the side where the anchor is located. The wall thickness of the large-diameter section of the positioning pipe 23 is greater than that of the small-diameter section, and the joint of the large-diameter section and the small-diameter section of the inner pipe wall of the positioning pipe 23 is in conical annular surface transition connection. The large and small diameter sections of the outer tube wall are connected by a step surface perpendicular to the tube core, the bushing 24 is sleeved on the small diameter section of the positioning tube 23, the bushing 24 is tightly matched with the positioning tube 23, and the end surface of the bushing is connected with the step surface of the outer tube wall of the positioning tube 23 in an abutting mode.
The method for replacing the bridge stay cable by adopting the stay cable positioner comprises the following steps:
step A, releasing the tension of the target steel strand 11 a;
step B, disassembling the target steel strand 11a with the tensile force removed in the step A, and simultaneously drawing a new steel strand;
and C, tensioning the new steel strand to complete the installation of the new steel strand.
The "target steel strand 11 a" is the steel strand 11 to be replaced in this operation. When the cable positioner 20 is adopted, the target steel strand 11a is in non-contact fit with other steel strands 11, so that the target steel strand 11a can be replaced on the premise of not damaging other bearing parts without disassembling the positioner 20, and cable replacement steps are greatly simplified. Meanwhile, the operation outside the component is not needed, so that the personal casualty accident caused by the breakage of the steel strand or the connection failure of the end part of the steel strand can be avoided. The "load bearing member" herein is a tension member that bears the same source load as the target steel strand 11a. For example, when the cable 10 is formed of two or more steel strands, the steel strand to be replaced in this operation is the target steel strand 11a, and the other steel strands 11 that form the cable 10 together with the target steel strand 11a are load bearing members. The phrase "the target steel strand 11a is in non-contact fit with other bearing components" means that the target steel strand 11a has no interaction force with other bearing components in a normal working state.
When the stay cable 10 is composed of more than two steel strands 11 and has a plurality of steel strands 11 to be replaced, the stay cable positioner and the bridge stay cable replacing method comprise the following steps:
step A, releasing the tension of a target steel strand 11 a;
step B, disassembling the target steel strand 11a with the tensile force removed in the step A, and simultaneously drawing a new steel strand;
and C, tensioning the new steel strand to complete the installation of the new steel strand.
And D, repeating the step A until all the target steel strands 11a are replaced.
Because the target steel strand 11a at the positioner 20 is arranged at an interval with other bearing components, and the interval meets the requirement of single disassembly of the target steel strand 11a, the target steel strand 11a can be disassembled and replaced without disassembling the positioner 20.
When the inhaul cable is replaced,
in step a, the connection between the target steel strand 11a and the anchor 30 at one end is released.
In the step B, after the target steel strand 11a with the tension removed and the new steel strand are connected by the connecting assembly, the target steel strand 11a with the tension removed is drawn out from the anchorage device 30 at the other end, so that the traction of the new steel strand can be completed while the target steel strand 11a is detached from the anchorage device assembly.
In this embodiment, as shown in fig. 1, both ends of the cable 10 are fixed to a structure by anchors 30. The end of the anchorage 30 is located inside the structure, and the tension releasing work is performed inside the structure. After the tension of the target steel strand 11a is removed, it should be withdrawn from the outside of the anchor 30 at the other end, and this operation is also performed at the inside of the structure.
Claims (8)
1. A stay cable locator which characterized in that: including positioning seat (21), be equipped with on positioning seat (21) and supply via hole (22) that steel strand wires (11) run through, via hole (22) and steel strand wires (11) one-to-one arrange and interval arrangement between adjacent via hole (22).
2. A cable positioner according to claim 1, wherein: the distance between adjacent through holes (22) is gradually reduced from the end close to the anchor to the end far away from the anchor, and flexible linings are laid on the inner wall surfaces of the through holes (22).
3. A cable positioner according to claim 1, wherein: an annular bushing (24) made of flexible materials is arranged on the outer side of the positioning seat (21).
4. A cable positioner according to claim 3, wherein: the positioning seat (21) is formed by pouring concrete, a positioning pipe (23) is arranged on the outer side of the positioning seat (21), and the lining (24) is sleeved on the positioning pipe (23).
5. A cable locator according to claim 4, wherein: the positioning pipe (23) is integrally in a stepped pipe shape, the large-diameter section is arranged close to the side where the anchorage device is located, the small-diameter section is arranged far away from the side where the anchorage device is located, the wall thickness of the large-diameter section of the positioning pipe (23) is larger than that of the small-diameter section, the joint of the large-diameter section and the small-diameter section of the inner pipe wall of the positioning pipe (23) is in transition connection through a conical ring surface, and the joint of the large-diameter section and the small-diameter section of the outer pipe wall is connected through; the bushing (24) is sleeved on the small-diameter section of the positioning pipe (23), and the end face of the bushing (24) is connected with the step face of the outer pipe wall of the positioning pipe (23) in an abutting mode; the positioning tube (23) is made of metal material.
6. The method for replacing the stay cable of the bridge by adopting the stay cable positioner of the claims 1 to 5 comprises the following steps:
step A, releasing the tension of a target steel strand (11);
step B, disassembling the target steel strand (11) with the tension removed in the step A, and simultaneously drawing a new steel strand;
and C, tensioning the new steel strand to complete the installation of the new steel strand.
7. The method for replacing a stay cable of a bridge according to claim 6, wherein: the inhaul cable (10) is composed of more than two steel strands, and in the step A, the tension of only one steel strand is released each time; and D, repeating the step A until the target steel strand is replaced.
8. The method for replacing a stay cable of a bridge according to claim 6, wherein: two ends of the inhaul cable (10) are respectively fixed on the structure through an anchorage device (30),
in the step A, the connection between the target steel strand (11) and an anchorage device (30) at one end is released,
and in the step B, after the target steel strand (11) with the tension being removed is connected with the new steel strand by the connecting assembly, the target steel strand (11) with the tension being removed is drawn out from the anchorage device (30) at the other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010406268.0A CN111549686A (en) | 2020-05-14 | 2020-05-14 | Stay cable positioner and bridge stay cable replacing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010406268.0A CN111549686A (en) | 2020-05-14 | 2020-05-14 | Stay cable positioner and bridge stay cable replacing method |
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| Publication Number | Publication Date |
|---|---|
| CN111549686A true CN111549686A (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010406268.0A Pending CN111549686A (en) | 2020-05-14 | 2020-05-14 | Stay cable positioner and bridge stay cable replacing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114481836A (en) * | 2021-12-22 | 2022-05-13 | 威胜利工程有限公司 | High-strength weather-resistant steel strand stay cable complete set structure, preparation process and construction process |
-
2020
- 2020-05-14 CN CN202010406268.0A patent/CN111549686A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114481836A (en) * | 2021-12-22 | 2022-05-13 | 威胜利工程有限公司 | High-strength weather-resistant steel strand stay cable complete set structure, preparation process and construction process |
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