CN111535179A - Suspension bridge main cable structure utilizing ventilating steel pipes to dehumidify - Google Patents
Suspension bridge main cable structure utilizing ventilating steel pipes to dehumidify Download PDFInfo
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- CN111535179A CN111535179A CN202010392013.3A CN202010392013A CN111535179A CN 111535179 A CN111535179 A CN 111535179A CN 202010392013 A CN202010392013 A CN 202010392013A CN 111535179 A CN111535179 A CN 111535179A
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The main cable of the suspension bridge is a main load part of the suspension bridge, and the quality degree of dehumidification treatment of the main cable of the suspension bridge is related to the service life and the safety factor of the suspension bridge. The invention provides a suspension bridge main cable structure for dehumidification by using an air-permeable steel pipe, which can effectively control the air humidity of a main cable through the air-permeable steel pipe, so that the air inside the main cable of a suspension bridge can be kept dry, and the service life of a bridge is prolonged.
Description
Technical Field
The invention relates to the field of suspension bridge main cable structures, in particular to a suspension bridge main cable structure for dehumidification by using an air-permeable steel pipe.
Background
Aiming at the problems in the dehumidification and corrosion prevention technology of the existing suspension bridge main cable, the invention provides a suspension bridge main cable structure for dehumidifying by using an air-permeable steel pipe, which solves the problem that moist air in the suspension bridge main cable is difficult to remove completely.
In a conventional dehumidification system, dry air is generally injected into the main cable from the outside to the inside at a certain pressure. However, because the gaps between the strands inside the main cable and between the parallel steel wires inside the strands are small, the dry air poured from outside to inside is difficult to enter the gaps. The humid air still generates a corrosion environment in the main cable, and in the corrosion process of the main cable, an oxidizing substance generated by a corrosion part between materials fills a pore, so that subsequent dry air is more difficult to intervene, and a vicious circle is formed.
In a structure similar to the present invention, CN208501495, "structure of air inlet duct for dehumidifying dry air", does not consider the use of materials, the positions of through holes and the manner of embedding cables in the structure of the air inlet duct, and has great difficulty in use.
According to the invention, the ventilating steel pipes made of the same material as the parallel steel wires are embedded into the parallel steel wires and the cable strands, and dry air dehumidification is carried out in a grouping mode, so that a reliable dehumidification structure is provided for the main cable from inside to outside on the premise of not influencing the performance of the main cable, the dehumidification efficiency of the main cable is improved, and the dehumidification of the main cable is more convenient, rapid and reliable.
Disclosure of Invention
The invention provides a suspension bridge main cable structure for dehumidifying by using an air-permeable steel pipe.
Specifically, the suspension bridge main cable structure for dehumidifying by using the ventilating steel pipes comprises a parallel steel wire made of special high-strength steel wires, and the size, the shape, the quality, the mechanical property, the chemical composition and other technical requirements of the parallel steel wire meet the requirements of GB/T17101-2019 and GB/T20492-2019. The parallel steel wires are filled in the stressed cable strands, are main materials of main cable loads and play a role in bearing in the main cables.
Specifically, the suspension bridge main cable structure utilizing the ventilating steel pipes for dehumidification further comprises a central cable strand, wherein the central cable strand is filled with the ventilating steel pipes and is installed in the center of the main cable, and the central cable strand is filled with the ventilating steel pipes and is composed of 61 ventilating steel pipes, 91 ventilating steel pipes and 127 ventilating steel pipes which are arranged in a regular hexagon in parallel according to different specifications.
Specifically, the suspension bridge main cable structure for dehumidifying by using the ventilating steel pipes is characterized in that except for a central cable strand fixed at the center of the main cable, the rest cable strands of the main cable are stressed cable strands and are formed by combining 1 ventilating steel pipe and 60, 90 and 126 parallel steel wires according to different specifications, the ventilating steel pipes are arranged at the center of the cable strands, and the rest parallel steel wires are arranged in a regular hexagon shape by taking the ventilating steel pipes as the circle center.
Specifically, the suspension bridge main cable structure for dehumidification by using the ventilating steel pipes further has appearance treatment meeting national standards.
Specifically, the ventilating steel pipe is made of the same material as the parallel steel wires, so that galvanic corrosion between different metals is prevented. In the manufacturing process, a process for increasing the ductility is used, so that the ductility is higher than that of a parallel steel wire, and deformation or fracture caused by stretching in use is prevented.
Preferably, the outer diameter and the length of the ventilating steel pipe are the same as those of the parallel steel wires, so that the space utilization rate is increased, and the ventilating steel pipe is uniformly distributed in the cable strand. The thickness of the steel pipe is 0.5-2.0 mm, so that the steel pipe has enough supporting force. The aperture of the through holes on the steel pipe is 0.5-2.5 mm, 2-100 through holes are arranged in each meter and are distributed in a staggered mode, and the through holes are used as passages for dry air to enter the main cable from the interior of the steel pipe.
Preferably, because the number of the parallel steel wires surrounded by each air steel pipe is 6, in the process of manufacturing the cable strand, the contact surfaces of the air steel pipes and the parallel steel wires are 6 and are in a regular hexagon shape, so that the air efficiency is increased to the maximum extent, the number of the through holes on the circumference upper part of the cross section of the air steel pipes is 4 or 4 times, generally 4, 8 or 12, and the through holes on the air steel pipes are prevented from being completely blocked by the parallel steel wires in accidental situations.
Furthermore, the ventilating steel pipes are provided with air inlets communicated with the dry air pipelines at one ends of the main cables, dry air with certain pressure is filled into the air inlets, so that the insides of the ventilating steel pipes are filled with air, and meanwhile, the dry air is exhausted from the through holes in the ventilating steel pipes, so that the insides of the main cables are kept dry.
Preferably, the main cable ventilation mode is carried out in a grouping mode, firstly, the main cable is divided into 3-30 sections according to the length of the main cable, and the sections are respectively marked as A1~AnAnd (3) dividing the ventilation steel pipes in the central strand of the main cable into 3-30 groupsAlso marked A1~AnThe groups are marked as A, and simultaneously, the stressed cable strands of the whole cable are divided into 3-30 groups1~AnAnd (4) grouping.
Preferably, the mark A is used when the main cable is dehumidified1The ventilating steel pipes in the group of the stress cable strand and the central cable strand are only arranged at A of the main cable1The sections are intensively punched, the density of holes is 2-100 holes per meter, and the mark is A2The ventilating steel pipes in the group of the stress cable strand and the central cable strand are only arranged at A of the main cable2The sections are punched, the hole density is also 2-100 per meter, and so on.
Preferably, to avoid over-concentration of packets, the present invention employs a uniform grouping manner, i.e., at a1All the ventilation steel pipes or the stressed cable strands are uniformly distributed in the whole main cable, so that the dehumidifying effect is prevented from being influenced by the non-uniform dry air.
Specifically, on the basis of the above structural scheme, the concrete dehumidification process of the suspension bridge main cable structure using the ventilating steel pipes is as follows:
the method comprises the steps of firstly, knowing the application occasion of a main cable, selecting a proper segmentation mode according to the length of the main cable of the application occasion, and dividing the main cable into 3-30 sections marked as A1~AnAnd (4) section.
Secondly, in the manufacturing process of the ventilating steel pipe, according to the segmentation mode of the previous step, punching is carried out at different positions of the ventilating steel pipe, namely, the holes are punched at the positions A1The ventilating steel pipe for dehumidification in the section is only A1Punching is carried out in the distance of the sections, the hole density is 2-100 holes per meter, the rest lengths are not processed, and the like is carried out.
And thirdly, in the process of manufacturing the cable strands, respectively manufacturing two types of cable strands, wherein one type of cable strand takes the ventilating steel pipe as the center, stress cable strands formed by fixing parallel steel wires are distributed and fixed on the periphery of the ventilating steel pipe, and the other type of cable strand is central cable strands formed by distributing and fixing all the ventilating steel pipes, and the ventilating steel pipes and the stress cable strands are uniformly distributed in the central cable strands and the main cables according to the requirements of the first two steps.
Fourthly, performing the subsequent manufacturing step of the main cable, namely performing appearance processing on the main cable by using the national standard;
and fifthly, connecting the main cable with a dry air generating device, performing dehumidification treatment on the main cable, and maintaining long-term stable humidity monitoring of the main cable.
Compared with the existing suspension bridge dehumidification technology, the invention has the following advantages.
Firstly, dry air is filled from inside to outside to enable the main cable to be dehumidified more thoroughly
In the application scene of bridge dehumidification, the traditional dehumidification structure and the dehumidification system have great technical defects, fundamentally, the dry air is unevenly distributed in the process of filling the main cable, namely the traditional dehumidification dry air only stays on the surface of the cable, cannot enter gaps among the strands and cannot enter gaps among parallel steel wires in the strands, and the defects directly cause the failure of anticorrosion measures of the dehumidification system in the application process. The invention provides a dehumidification structure of a main cable of a suspension bridge from inside to outside, which ensures the strength of the main cable, ensures that dry air can be filled between parallel steel wires and cable strands inside the main cable through an air inlet, has higher efficiency than the traditional mode, does not influence the strength of the main cable during corrosion prevention, and can reduce economic loss and potential safety hazard caused by corrosion of the main cable.
Secondly, the same material can avoid galvanic corrosion
The core content of the invention is the ventilating steel pipe and the position thereof in the strand and the main cable. The material of the air-permeable steel pipe is the same as that of the parallel steel wires in the present invention, because the dissimilar metal is electrochemically corroded, also referred to as galvanic corrosion, in a natural environment by long-term contact due to the difference in the electrode potential. The invention uses the same material to manufacture the ventilating steel pipe, thereby avoiding the occurrence of galvanic corrosion.
Thirdly, the size is reasonable to ensure the space utilization rate of the main cable and the flow of the dry air
In the invention, the ventilating steel pipe adopts the capillary coil pipe, the length and the outer diameter of the ventilating steel pipe are the same as those of the parallel steel wires of the main cable, namely, the space is fully utilized, and the influence of the deformation caused by stress on the service life of the main cable is avoided. The thickness of the steel pipe is 0.5-2.0 mm. The steel pipe is provided with through holes, the aperture is 0.5-2.5 mm, the number of the through holes is 2-100 per meter, the through holes are distributed in a staggered mode, and the through holes are used as passages for dry air to enter the main cable from the inside of the steel pipe, so that the flow of the introduced air is guaranteed.
Fourthly, the grouped ventilation avoids the blockage or air leakage of the through hole at the front section of the main cable to influence the passing of the dry air at the rear section
In the practical application occasion of main push-towing rope, the environment that the main push-towing rope exposes does not have the determinants, external force, artificial ineffectiveness factor such as can lead to partial main push-towing rope damage or take place internal pollution promptly, influences going on of ventilating, in traditional dehumidification, adopts the mode of establishing ties to carry out air dehumidification usually, in case take place gas leakage, blocking phenomenon in the pipeline, all can influence the inside dry air that passes through of back end main push-towing rope. The invention adopts the modes of sectional dehumidification and uniform pipe and strand distribution, avoids the problems and ensures that the dehumidification link of the main cable is more reliable.
Drawings
Fig. 1 shows the overall structure of a main cable.
Fig. 2 is a stressed strand structure.
Figure 3 is a central strand structure.
FIG. 4 is a schematic view of the steel breather pipe and the through hole.
Fig. 5 is a schematic illustration of main cable segment venting.
FIG. 6 is a schematic diagram of the grouping of the air-permeable steel pipes in the stressed strand and the central strand.
Detailed Description
Aiming at the defects of the traditional suspension bridge dehumidification main cable structure in the prior art, the invention provides a suspension bridge main cable structure for dehumidification by using an air-permeable steel pipe, and the main implementation principle, the specific implementation mode and the corresponding beneficial effects of the implementation technical scheme of the invention are elaborated in detail by combining various figures.
Example 1.
1 Standard suspension bridge main cable based on the invention
Because the length specifications of the main cable of the suspension bridge have certain difference, the number of the parallel steel wires in the cable strand can be divided into 61, 91 and 127 according to the requirement, and the embodiment selects 61 standard cable strands for description.
1.1 Main Cable Specification
The number of the main cables adopted by the main cable is 19, wherein the rest cables except the central cable all adopt stressed cables, and the number of the stressed cables is 18, which is shown in figure 1.
1.2 stress cable strand structure
The other parts of the stressed cable strand except the central ventilating steel pipe are all parallel steel wires, the lengths of the parallel steel wires and the ventilating steel pipes are the same, the lengths are generally related to the size of an applied bridge, and the parallel steel wires are selected to be in a phi 5mm grade in the embodiment of the invention. Each strand is of regular hexagonal cross-section, see fig. 2.
1.3 Central Cable Strand Structure
The central cable strand consists of ventilating steel pipes, and the other specifications are the same as those of the stressed cable strand, which is shown in figure 3.
1.4 ventilated steel pipe structure
The ventilation steel pipe adopts the capillary coil pipe, and length and external diameter are the same with the parallel steel wire of main push-towing rope, promptly when make full use of space, avoid producing stress and deformation influence main push-towing rope life. The thickness of the steel pipe is 1.5mm, on the air outlet section of the main cable dehumidification group, through holes are formed in the steel pipe at intervals, the hole diameter is 0.8mm, 16 through holes are formed in each meter and distributed in a staggered mode, the through holes are used as passages for dry air to enter the main cable from the interior of the steel pipe, and the flow of the introduced air is guaranteed, and the reference of figure 4 is made.
1.6 grouping ventilation main cable structure
The through holes are opened at different positions of the main cable in a grouping mode for ventilation, in this example, the main cable of the suspension bridge is divided into A1，A2，A3，A4Four sections, as shown in fig. 5, according to which the ventilating steel pipes in the stressed cable strand and the central cable strand inside the main cable are respectively divided into a1，A2，A3，A4And four groups of the stress cables and the ventilation steel pipes are perforated and ventilated according to corresponding sections, as shown in figure 6.
Claims (10)
1. The utility model provides an utilize suspension bridge main push-towing rope structure of steel pipe dehumidification that ventilates which characterized in that includes: the cable comprises a central cable strand (1), a stressed cable strand (2) and an outer layer shape processing (3).
2. A suspension bridge main cable structure for dehumidification by using a ventilating steel pipe is characterized by further comprising parallel steel wires (4) made of high-strength special steel in a stressed cable strand (1), wherein the size, the shape, the quality, the mechanical property, the chemical composition and other technical requirements of the parallel steel wires meet the requirements of GB/T17101-2019 and GB/T20492-2019.
3. A suspension bridge main cable structure for dehumidification by using an air-permeable steel pipe is characterized by further comprising an air-permeable steel pipe (5) with air permeability in two strands.
4. A suspension bridge main cable structure using ventilating steel pipes to dehumidify as claimed in claim 1, wherein each main cable is a stressed cable strand (2) composed of parallel steel wires (4) and ventilating steel pipes (5) except the central cable strand (1).
5. The stressed cable strand (2) as claimed in claim 4, wherein the interior of the stressed cable strand is formed by fixing parallel steel wires (4) around the ventilating steel tube (5) as a circle center in parallel arrangement, and the stressed cable strand consists of 1 ventilating steel tube (5) and 60 parallel steel wires (4), 1 ventilating steel tube (5) and 90 parallel steel wires (4), 1 ventilating steel tube (5) and 126 parallel steel wires (4) according to different specifications, and is arranged in a regular hexagon.
6. The main cable structure of a suspension bridge using the air-through steel tubes for dehumidification according to claim 1, wherein the central strands (1) are formed by arranging the air-through steel tubes (5) in parallel, and are formed by arranging 61, 91 and 127 air-through steel tubes (5) in a regular hexagon according to different specifications.
7. The main cable structure of a suspension bridge using the aeration steel pipe for dehumidification according to claim 1, wherein the outer shape treatment (3) of the outermost structure is made by a national standard cable surface treatment method.
8. The steel aeration pipes (5) in two strands according to claim 3, the selected material is the same material of the parallel steel wires (4), the wall thickness is 0.5-2.0 mm, and through holes are drilled at different positions on the steel aeration pipes, the diameter of the through holes is 0.5-2.5 mm, the number of the through holes is 2-100 per meter, the outer diameter and the shape of the steel aeration pipes (5) are the same as those of the parallel steel wires (4), and the steel aeration pipes are divided into two types of phi 5mm grade and phi 7mm grade.
9. The aeration steel pipe (5) in two strands according to claim 3, the elongation of the material is increased in the manufacturing process, the total elongation is larger than that of the parallel steel wires (4), and the tensile stress deformation or fracture is prevented in use.
10. The air-permeable steel pipe (5) as claimed in claim 3, the through hole position is divided into 3-30 sections by taking the length of the main cable as a unit, then the stressed cable strand (2) in the main cable and the air-permeable steel pipe (5) in the central cable strand (1) are respectively divided into 3-30 groups, and then air is conducted in a mode of perforating on each corresponding section of the main cable by taking the group of the air-permeable steel pipes (5) as a unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010392013.3A CN111535179A (en) | 2020-05-11 | 2020-05-11 | Suspension bridge main cable structure utilizing ventilating steel pipes to dehumidify |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010392013.3A CN111535179A (en) | 2020-05-11 | 2020-05-11 | Suspension bridge main cable structure utilizing ventilating steel pipes to dehumidify |
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| CN111535179A true CN111535179A (en) | 2020-08-14 |
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| CN202010392013.3A Withdrawn CN111535179A (en) | 2020-05-11 | 2020-05-11 | Suspension bridge main cable structure utilizing ventilating steel pipes to dehumidify |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112064384A (en) * | 2020-08-17 | 2020-12-11 | 中铁大桥勘测设计院集团有限公司 | Arrangement structure and arrangement method before extrusion and rounding of main cable of suspension bridge |
| CN112301888A (en) * | 2020-10-23 | 2021-02-02 | 无锡金诚工程技术服务有限公司 | Suspension bridge main cable with inner gas transmission pipeline |
| CN113481849A (en) * | 2021-07-19 | 2021-10-08 | 重庆万桥交通科技发展有限公司 | Cable system |
| CN114908667A (en) * | 2022-05-16 | 2022-08-16 | 中交第二航务工程局有限公司 | Dehumidification system and dehumidification method for main cable of suspension bridge |
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| CN110080106A (en) * | 2019-04-30 | 2019-08-02 | 江苏法尔胜缆索有限公司 | A kind of tube method Prefabricated parallel wire sling |
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| JP3173956B2 (en) * | 1994-12-20 | 2001-06-04 | 本州四国連絡橋公団 | Rust prevention method and device for cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112064384A (en) * | 2020-08-17 | 2020-12-11 | 中铁大桥勘测设计院集团有限公司 | Arrangement structure and arrangement method before extrusion and rounding of main cable of suspension bridge |
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| CN112301888A (en) * | 2020-10-23 | 2021-02-02 | 无锡金诚工程技术服务有限公司 | Suspension bridge main cable with inner gas transmission pipeline |
| CN113481849A (en) * | 2021-07-19 | 2021-10-08 | 重庆万桥交通科技发展有限公司 | Cable system |
| CN114908667A (en) * | 2022-05-16 | 2022-08-16 | 中交第二航务工程局有限公司 | Dehumidification system and dehumidification method for main cable of suspension bridge |
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Application publication date: 20200814 |
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