CN114908667B - Main cable dehumidification system and dehumidification method for suspension bridge - Google Patents
Main cable dehumidification system and dehumidification method for suspension bridge Download PDFInfo
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- CN114908667B CN114908667B CN202210528572.1A CN202210528572A CN114908667B CN 114908667 B CN114908667 B CN 114908667B CN 202210528572 A CN202210528572 A CN 202210528572A CN 114908667 B CN114908667 B CN 114908667B
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- dehumidification
- main cable
- strand
- suspension bridge
- 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
- 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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension 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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a main cable dehumidification system and a dehumidification method of a suspension bridge. Compared with the traditional method, the method omits the arrangement of the external air pipe, the air inlet and outlet cable clamps and other dehumidifying auxiliary structures, only needs to arrange a few slotted steel wires in the original main cable structure, and is installed in place along with the cable strand in one step, thereby saving a great amount of manpower and material resource costs.
Description
Technical Field
The invention relates to the technical field of suspension bridges. More particularly, the invention relates to a system and method for dehumidifying a main cable of a suspension bridge.
Background
The main cable is an important stress component on the suspension bridge, is exposed in the atmosphere for a long time, is easily corroded by moisture to influence the mechanical property, and the humidity data in the main cable is an important index for accurately evaluating the service life of the main cable. Meanwhile, as the main cable of the suspension bridge cannot be replaced once being built, the protection and dehumidification of the main cable of the suspension bridge are important works for guaranteeing the service life of the suspension bridge.
The existing main cable dehumidification mode mostly adopts a mode of adding an external pipeline, compressed air is compressed from an air inlet clamp through an external air pipe, dry air is sent to a gap between steel wires in the main cable by pressure, and moisture is discharged from an air exhaust cable clamp at a certain distance. This dehumidification has the following disadvantages: (1) when the span of the suspension bridge is large, long-distance external air pipes are required to be erected, the longer the air pipes are, the more difficult the tightness is ensured, and the dehumidification effect is reduced once leakage occurs; (2) the traditional main cable strand has small middle space, difficult air intake, difficult spreading of dry gas on the section of the main cable, poor dehumidification effect on the bottom side, long dehumidification period, and 1-2 years of dehumidification time to meet design requirements; (3) the system is complex, and the installation workload is large; therefore, in order to solve the problem of the existing main cable dehumidification method, a new main cable dehumidification system is needed.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a main cable dehumidification system and a dehumidification method for a suspension bridge, which solve the problems of complicated external pipeline arrangement and difficult air intake in the traditional main cable dehumidification method.
The technical scheme adopted by the invention for solving the technical problem is as follows: a dehumidifying system of a main cable of a suspension bridge is characterized in that a dehumidifying air passage is arranged in the strands of the main cable along the length direction of the strands, and the dehumidifying air passage of each strand positioned at the head end of an anchor is connected with a fan air pipe.
Preferably, the center of the strand is provided with a moisture-removing air passage.
Preferably, slotted steel wires are arranged in the strands to form the moisture removal air passage.
Preferably, the steel wire is provided with a plurality of slots parallel to the axial direction of the steel wire at intervals along the circumferential direction thereof.
Preferably, the steel wire is externally wrapped with an open-pore metal foil.
Preferably, the fan gas pipe is connected with the air inlet anchor chamber fan.
Preferably, the other end of the moisture exhaust channel of each strand is connected with an air outlet anchor chamber, and a humidity sensor is arranged in the air outlet anchor chamber.
Preferably, the length of the moisture removal airway is equal to or longer than the length of the corresponding strand.
The invention also provides a main cable dehumidification method of the suspension bridge, wherein slotted steel wires are arranged at the centers of the strands along the lengths of the strands to form moisture discharge air passages before the strands are installed, the moisture discharge air passage of each strand at the head end of the cable is connected with a fan air pipe, the other end of the moisture discharge air passage of each strand is connected with an air outlet anchor chamber, and a humidity sensor is arranged in the air outlet anchor chamber;
when dehumidification is carried out, dry inert gas is continuously blown into a fan gas pipeline through a fan of the air inlet anchor chamber, the gas enters the air outlet anchor chamber through a slot, moisture in a main cable is taken away, and when the humidity of the discharged gas in the air outlet anchor chamber is lower than a set humidity value in a time period t, dehumidification is completed.
The invention at least comprises the following beneficial effects:
1) Compared with the traditional method, the method omits the arrangement of external air pipes, air inlet and outlet cable clamps and other dehumidifying auxiliary structures, only needs to arrange a few slotted steel wires in the original main cable structure, and is installed in place along with the cable strands in one step, so that a great amount of labor and material costs are saved.
2) The slotted steel wires which are uniformly distributed enable the air in the main cable to circulate smoothly, and the drying air can be quickly distributed on the section of the whole main cable in the process of dehumidifying, so that the dehumidifying effect is good and the time is short.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic diagram of the main cable structure of the present invention;
FIG. 2 is a schematic view of the structure of a slotted steel wire of the present invention;
fig. 3 is a schematic diagram of the main cable dehumidification system of the suspension bridge of the present invention.
1 cable strand, 2 steel wires, 3 metal foil, 4 slotting, 5 main cables, 6 air inlet anchor chamber fans and 7 air outlet anchor chambers.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be noted in particular that: the technical solutions and technical features provided in the sections including the following description in the present invention may be combined with each other without conflict.
In addition, the embodiments of the present invention referred to in the following description are typically only some, but not all, embodiments of the present invention. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
The invention is further described in detail below with reference to the drawings and the implementation, and the implementation process is as follows:
as shown in fig. 1, the invention provides a dehumidification system for a main cable 5 of a suspension bridge, wherein a wet exhaust air passage is arranged in a cable strand 1 of the main cable 5 along the length direction of the cable strand 1, dry gas is conveyed, and the wet exhaust air passage of each cable strand 1 at the anchor end is connected with a fan gas pipe to exhaust gas with moisture.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the center of the cable strand 1 is provided with a moisture-removing air passage.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: a slotted 4 steel wire 2 is arranged in the strand 1 to form the moisture removal air passage.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the steel wire 2 is provided with a plurality of fluting 4 that are on a parallel with steel wire 2 axial along its circumference interval, and steel wire 2 is provided with three sets of fluting 4 along its circumference in this embodiment, and fluting 4's cross-section is the U-shaped, and inert gas circulates in main rope 5 through fluting 4, takes away the moisture in the main rope 5, fluting 4 evenly distributed, and the dry gas can be covered whole main rope 5 cross-section fast in the dehumidification in-process, improves the dehumidification effect, and steel wire 2 fluting 4 position and quantity can be changed according to actual need.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: as shown in fig. 2, the steel wire 2 is externally wrapped with an open-pore metal foil 3.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the fan gas pipe is connected with the air inlet anchor chamber fan 6.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the other end of the moisture exhaust channel of each cable strand 1 is connected with an air outlet anchor chamber 7, and a humidity sensor is arranged in the air outlet anchor chamber 7.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the length of the moisture removal airway is equal to or longer than the length of the corresponding strand 1.
In another embodiment, a dehumidification method for a main cable 5 of a suspension bridge is provided, before the cable strands 1 are installed, slotted 4 steel wires 2 are arranged in the center of each cable strand 1 along the length of each cable strand 1 to form a moisture discharge air passage, the moisture discharge air passage of each cable strand 1 positioned at the head end of an anchor is connected with a fan air pipe, the other end of the moisture discharge air passage of each cable strand 1 is connected with an air outlet anchor chamber 7, and a humidity sensor is arranged in the air outlet anchor chamber 7.
As shown in fig. 3, the dehumidification method of the main cable 5 does not need to add auxiliary dehumidification equipment, only needs to arrange air inlet and outlet equipment in anchor chambers at two ends, and connects the air passage steel wire 2 in the main cable 5 with the air inlet anchor chamber fan 6 from the anchor heads. When the system operates, dry inert gas is filled into the gas inlet, moisture is discharged from the gas outlet anchor chamber 7, a humidity sensor is arranged in the gas outlet anchor chamber 7, and when the discharged gas meets the humidity requirement for a period of time, dehumidification is completed. The relative humidity of the main cable can be reduced from 80-90% to below 40% within the whole length range of the main cable in 6 months or even shorter by adopting the dehumidifying system. Compared with the traditional dehumidification method, the time for reaching the same relative humidity for 1-2 years is as fast as 2-4 times, and the corrosion rate of the primary main cable steel wire is slowed down by more than 50%.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown, it is well suited to various fields of use for which the invention is suited, and further modifications may be readily made by one skilled in the art, and the invention is therefore not to be limited to the particular details and examples shown and described herein, without departing from the general concepts defined by the claims and the equivalents thereof.
Claims (8)
1. The main cable dehumidification system of the suspension bridge is characterized in that a dehumidification air passage is arranged in the cable strand of the main cable along the length direction of the cable strand, and the dehumidification air passage of each cable strand at the head end of the anchor is connected with a fan air pipe;
slotted steel wires are arranged in the strands to form the moisture removal air passage.
2. The suspension bridge main cable dehumidification system of claim 1, wherein the strand center is provided with a moisture removal airway.
3. A suspension bridge main cable dehumidification system according to claim 1, wherein the steel wire is provided with a plurality of slots spaced along its circumference in parallel with the axial direction of the steel wire.
4. A suspension bridge main cable dehumidification system according to claim 1, wherein the steel wires are externally wrapped with an open-cell metal foil.
5. The suspension bridge main cable dehumidification system of claim 1, wherein the fan gas line is connected to a suction anchor room fan.
6. The system of claim 5, wherein the other end of the moisture removal channel of each strand is connected to an air outlet anchor chamber, and a humidity sensor is disposed in the air outlet anchor chamber.
7. The suspension bridge main cable dehumidification system of claim 1, wherein the length of the moisture evacuation airway is equal to or longer than the length of the corresponding strand.
8. The dehumidification method of the main cable of the suspension bridge is characterized in that slotted steel wires are arranged at the centers of strands along the lengths of the strands before the strands are installed to form a dehumidification air passage, the dehumidification air passage of each strand at the head end of an anchor is connected with a fan air pipe, the other end of the dehumidification air passage of each strand is connected with an air outlet anchor chamber, and a humidity sensor is arranged in the air outlet anchor chamber;
when dehumidification is carried out, dry inert gas is continuously blown into a fan gas pipeline through a fan of the air inlet anchor chamber, the gas enters the air outlet anchor chamber through a slot, moisture in a main cable is taken away, and when the humidity of the discharged gas in the air outlet anchor chamber is lower than a set humidity value in a time period t, dehumidification is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210528572.1A CN114908667B (en) | 2022-05-16 | 2022-05-16 | Main cable dehumidification system and dehumidification method for suspension bridge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210528572.1A CN114908667B (en) | 2022-05-16 | 2022-05-16 | Main cable dehumidification system and dehumidification method for suspension bridge |
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| Publication Number | Publication Date |
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| CN114908667A CN114908667A (en) | 2022-08-16 |
| CN114908667B true CN114908667B (en) | 2023-04-25 |
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| CN202210528572.1A Active CN114908667B (en) | 2022-05-16 | 2022-05-16 | Main cable dehumidification system and dehumidification method for suspension bridge |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101135760B1 (en) * | 2003-06-02 | 2012-04-24 | 프레이씨네 | Method for anchoring parallel wire cables |
| WO2015123620A1 (en) * | 2014-02-14 | 2015-08-20 | The Trustees Of Columbia University In The City Of New York | High-strength wires for uniform and hybrid structural cables |
| CN111535180A (en) * | 2020-05-11 | 2020-08-14 | 北京赛亿科技有限公司 | Stay cable bridge stay cable structure for dehumidifying by using ventilating steel pipes |
| CN111535179A (en) * | 2020-05-11 | 2020-08-14 | 北京赛亿科技有限公司 | Suspension bridge main cable structure utilizing ventilating steel pipes to dehumidify |
| CN111945562B (en) * | 2020-08-12 | 2022-07-01 | 郑州大学 | Dehumidification method of main cable of suspension bridge |
| CN114075808A (en) * | 2020-08-17 | 2022-02-22 | 比亚迪股份有限公司 | Cable-stayed bridge structure |
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