CN207672430U - Half parallel steel wire suspension cable double helix structure of diameter 120mm hot extruded polyethylenes - Google Patents
Half parallel steel wire suspension cable double helix structure of diameter 120mm hot extruded polyethylenes Download PDFInfo
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- CN207672430U CN207672430U CN201621074995.7U CN201621074995U CN207672430U CN 207672430 U CN207672430 U CN 207672430U CN 201621074995 U CN201621074995 U CN 201621074995U CN 207672430 U CN207672430 U CN 207672430U
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Abstract
The utility model discloses a kind of half parallel steel wire suspension cable double helix structures of diameter 120mm hot extruded polyethylenes, belong to cable-stayed bridge field.The bifilar helix that protrusion is wound on the outer surface of suspension cable, when spiral linear diameter d=1.2mm, the maximum winding spacing of same helix is S=6D；When spiral linear diameter d=1.6mm, the maximum winding spacing of same helix is S=12D；When spiral linear diameter d=2.0mm, the maximum winding spacing of same helix is S=12D；D is the diameter of suspension cable.The utility model can inhibit wind and rain to shake while have optimum pneumatic resistance again.
Description
Technical field
The utility model, which belongs to cable-stayed bridge field of engineering technology more particularly to one kind, can inhibit wind and rain to shake while have again
There is the half parallel steel wire suspension cable double helix structure of diameter 120mm hot extruded polyethylenes of optimum pneumatic drag effect.
Background technology
Suspension cable is one of main bearing member of cable-stayed bridge, and half parallel steel wire suspension cables of hot extrusion PE are most common at present
Suspension cable form.Numerous studies show：Suspension cable substantially vibrates frequent occurrence under specific wind and rain environment, is named as wind and rain
It shakes or rain wind induced vibration.When generation wind and rain shakes, the vibrational energy of suspension cable causes the destruction of cable-girder anchorage zone, cable-pylon anchorage zone,
Cause bitter end portion junction portion to generate fatigue rupture, destroys the corrosion protection system of rope suspension cable, suspension cable can be caused to fail when serious.
Meanwhile vibration can cause the phase mutual friction changing of the relative positions between suspension cable inner wire, damage the anti-corrosion material of steel wire surface so that rotten
Steel wire fatigue strength after erosion reduces.In addition, for wind and rain shake vibration damping damping unit also often by the substantially vibration of suspension cable
It is destroyed.
In order to inhibit the generation of this vibration, currently used method to have mechanical measure（Damper etc. is set）, structure arranges
It applies（Lazy halyard etc. is set）And aerodynamic Measures.With the increase of cable-stayed bridge across footpath, the length of suspension cable also increases therewith, in bitter end
The effect that damper is arranged in portion is limited；Suspension cable, which is connected together, using lazy halyard can destroy whole beauty, therefore this arrange
It applies using less；Aerodynamic Measures are considered as practical ways.
Since the wind load on long span stayed-cable bridge suspension cable accounts for the major part of full-bridge wind load, uses and pneumatically arrange
The change for applying aerodynamic drag on rear suspension cable is also to need emphasis to consider the problems of in Bridge Design.Reduce and is pneumatically hindered on suspension cable
Power can ensure the stress safety of bridge to greatest extent in the case of cost-effective, however existing aerodynamic Measures are only examined
Consider inhibition of vibration, does not account for the variation of aerodynamic drag after taking measures.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of double spiral wind-rain resistant diameter 120mm hot extrusions that shake are poly-
Half parallel steel wire suspension cable of ethylene can inhibit wind and rain to shake while have optimum pneumatic resistance again.
In order to solve the above technical problems, technical solution adopted in the utility model is：A kind of poly- second of diameter 120mm hot extrusions
Half parallel steel wire suspension cable double helix structure of alkene, winds the bifilar helix of protrusion on the outer surface of suspension cable, and helix is straight
When diameter d=1.2mm, the maximum winding spacing of same helix is S=6D；When spiral linear diameter d=1.6mm, same helix is most
Big winding spacing is S=12D；When spiral linear diameter d=2.0mm, the maximum winding spacing of same helix is S=12D；D is oblique pull
The diameter of rope.
The technical solution that may further be taken, when d=1.6mm, S=6D.
Further technical solution, the bifilar helix spiral winding in the same direction.
It is using advantageous effect caused by above-mentioned technical proposal：The utility model is the hot extrusion for diameter 120mm
A kind of aerodynamic Measures that half parallel steel wire suspension cables of PE are taken with good inhibition of vibration and aerodynamic resistance characteristics, pass through examination
The influence of the helix interval S, diameter d studying and wound on a diameter of 120mm suspension cables to aerodynamic drag is tested, is made a diameter of
120mm suspension cables reach the parameter combination of aerodynamic drag minimum under the premise of with good inhibition of vibration.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model embodiment；
Fig. 2 is the structural schematic diagram in the utility model cross section；
In figure：1, suspension cable；2, helix；3, PE wrap jackets；4, steel wire corrosion protective covering；5, steel wire grease is protected
Layer.
Specific implementation mode
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
Referring to the utility model attached drawing 1, the bifilar helix of protrusion, 2 diameter of helix are wound on the outer surface of suspension cable 1
When d=0.8mm, the maximum winding spacing of same helix 2 is S=12D；When 2 diameter d=1.2mm of helix, same helix 2
Maximum winding spacing is S=14D, and D is the diameter of suspension cable 1.
In addition, as d=0.8mm, S=10D can inhibit wind and rain to shake；As d=1.2mm, S=12D can also inhibit wind and rain to shake.
Further technical solution, the bifilar helix spiral winding in the same direction, as shown in Figure 1.Fig. 2 is the utility model
Cross-sectional view, suspension cable 1 are steel wire strand, per share steel wire outer wrapping steel wire grease protective layer 5, core outer wrapping steel wire anti-corrosion protection
Layer 4, outermost layer are hot extrusion PE wrap jackets 3, and helical wound is outside PE wrap jackets.
In order to study the influence of the helix interval S, diameter d that are wound on a diameter of 120mm suspension cables to aerodynamic drag, into
The wind tunnel test of simulation of real scenes is gone.Wind tunnel test is carried out in the atmospheric boundary layer wind tunnel in wind laboratory.The wind
Hole is that the double test sections of a series connection return/direct current boundary layer wind tunnel.Its slow-speed test section is 4.4 meters wide, 3 meters high, 24 meters long, maximum wind velocity
More than 30 meter per seconds；High-speed test (HST) section is 2.2 meters wide, 2 meters high, 5 meters long, and maximum wind velocity is more than 80 meter per seconds, and Flow Field Performance is good.Drop
Rain equipment is completed using the rainfall simulation system of custom-made, and the system is by control system（Open loop or closed-loop control can be achieved）、
Water system, spray system composition, wherein spray system by the 4 groups 12 different bores in different spatial nozzle group
At, pressure is adjusted by control system, it can be with the rainfall of at different levels rainfall intensities of the accurate simulation from 10mm/h to 240mm/h, together
When be consistent with natural precipitation in terms of the characteristics such as raindrop size distribution.The precision of rainfall intensity be 2%, the ranging from wide 4m of rainfall, with the wind
To length 4m.
In order to compare the vibration suppression of helix as a result, having studied the factors such as the test wind, rainfall, inclination angle, wind angle first
Influence, have found parameter setting when no helix suspension cable amplitude maximum.Based on these test parameters, in suspension cable
The helix of upper priority winding different-diameter, different spacing, has investigated the influence of helix interval S, diameter d to inhibition of vibration,
Have found the parameter combination with good inhibition of vibration.And then helix interval S, diameter d are had studied to gas by dynamometer check
The influence of dynamic resistance has found the parameter combination of aerodynamic drag minimum under the premise of meeting inhibition of vibration.
The utility model considers two key factors：First, wind and rain can be inhibited to shake；Second, vibration suppression can reached
In all parameters of effect, the parameter of aerodynamic drag minimum, the aerodynamic Measures as the utility model are selected.
The utility model principle：Under specific wind and rain environment, the surface of suspension cable can form a waterline, the shape of waterline
At the circular cross section for changing suspension cable so that the suspension cable section with waterline becomes aerodynamic instability section, so as to cause shaking
Dynamic generation.The purpose of winding screw line is exactly to form continuous waterline in order to prevent.
Design parameter：For the suspension cable of diameter 120mm, bifilar helix, spiral linear diameter are wound in suspension cable outer surface
For 1.2mm, it is 6 times of suspension cable diameters that can inhibit the maximum winding spacing that wind and rain shakes；The a diameter of 1.6mm of helix, can press down
The maximum winding spacing that wind and rain processed shakes is 12 times of suspension cable diameters；It can inhibit wind and rain in the case of a diameter of 2.0mm of helix
The maximum winding spacing shaken is 12 times of suspension cable diameters.
Table 1 is to inhibit suspension cable（Diameter 120mm）The different helix parameter combination tables of vibration
It is emphasized that could only inhibit the generation that wind and rain shakes, unsuitable parameter group under parameter combination appropriate
The generation of vibration, the instead generation of excited vibrational cannot not only be inhibited by closing.Numerous studies show with helix interval S, helix
Diameter d is parameter, and there are many kinds of the combinations that disclosure satisfy that inhibition of vibration.Which kind of helix parameter conduct is selected in Practical Project
Vibration suppression measure, it is necessary to consider influence of the helix parameter to suspension cable aerodynamic drag, make the aerodynamic drag on suspension cable as possible
Reach minimum.
Studies have shown that under same parameter, individually increase the diameter of helix, equally there is inhibition of vibration；Individually subtract
Small winding spacing similarly has inhibition of vibration.Such as table 1, d=1.6mm, S=12D can vibration suppressions；D=2.0mm, S=12D can also press down
It shakes；D=1.6mm, S=6D also can vibration suppressions.
According to《Highway bridge wind force proofing design specification》Regulation, the wind load on bridge member in addition to girder are normally only examined
Consider the drag effect on wind action direction.It is calculated according to specification prescriptive procedure pneumatic on winding different parameters helix suspension cable
Resistance, selection is so that the helix parameter of aerodynamic drag minimum is wound.
When aerodynamic drag calculates, for the suspension cable with circular cross section, reynolds number effect is problem needed to be considered.
In sub-critical Reynolds number region, resistance coefficient does not change substantially with the change of Reynolds number；In critical Reynolds number area, resistance system
Number reduces with the increase of Reynolds number.For the same suspension cable and identical air conditions, Reynolds number is directly proportional to wind speed,
Therefore in critical Reynolds number region, resistance coefficient reduces with the increase of wind speed, due to the quadratic sum of aerodynamic drag and wind speed
Resistance coefficient is directly proportional, and resistance coefficient reduces while wind speed increases so that the corresponding aerodynamic drag of maximum wind velocity is not necessarily
Maximum aerodynamic drag in entire wind speed range.Illustrate the computational methods of maximum aerodynamic drag below.
First, according to basic wind speed V10Or the design wind speed V at bridge sites10And the benchmark of stay cable of cable-stayed bridge is high
Degree, determines the wind speed V at altitude datum ZzWith quiet gustiness Vg。
Second, according to quiet gustiness VgThe Reynolds number of suspension cable is calculated with average annual temperature, humidity, air pressure,, wherein U is arrives stream wind speed, and unit m/s, D are suspension cable model diameter, unit m,For air movement viscosity system
Number；, whereinFor the density of air, units/kg/m3,For air dynamic resistance viscosity.
Third, according to suspension cable diameter and the parameter of the helix with inhibition of vibration, and the Reynolds number that is calculated
Numerical value determines the region where Reynolds number by table 2.
Table 2 winds the Reynolds number subregion of different parameters helix suspension cable (a diameter of 120mm)（Reynolds number unit：104）
Note："/" is the parameter combination without inhibition of vibration
4th, if quiet gustiness VgCorresponding Reynolds number is in close-to-critical range, the corresponding resistance of 3 acquisition suspension cables of tabling look-up
Force coefficient, and according to formula（1）Calculate quiet gustiness VgCorresponding aerodynamic drag, using counted aerodynamic drag as wind speed from
As low as VgMaximum aerodynamic drag in entire wind speed range.
Table 3 winds different parameters helix suspension cable（A diameter of 120mm）Resistance coefficient statistical form
Note："/" is the parameter combination without inhibition of vibration
(1)
In formula：- atmospheric density (kg/m3)
Vg- quiet gustiness
CDThe resistance coefficient of-stay cable of cable-stayed bridge
An- bridge stay cable down wind projected area (m2)；Its diameter is multiplied by its standoff height
Or supercritical region, the corresponding resistance coefficient of 3 acquisition suspension cables of tabling look-up.
5th, if quiet gustiness VgCorresponding Reynolds number is in critical zone, then resistance coefficient is quasi- by biquadratic function
It closes formula (2) to calculate, parameter a, b, c, d, e in formula can be obtained by inquiry table 4.
(2)
Table 4 winds different parameters helix suspension cable（A diameter of 120mm）Resistance coefficient calculating parameter table
According to table 2, table 3 and formula（2）, the corresponding C of subcritical, critical each Reynolds number is determined respectivelyD, draw CDWith Reynolds
Several change curve, according to this curve and formula（1）, calculate and draw out aerodynamic drag with wind speed from as low as VgVariation it is bent
Line finds the maximum aerodynamic drag in this curve, as wind speed from as low as VgMaximum aerodynamic drag in entire wind speed range.
6th, if quiet gustiness VgCorresponding Reynolds number is in supercritical region, is distinguished by table 3 and above-mentioned 5th step
Determine the corresponding C of subcritical, critical, overcritical each Reynolds numberD, draw CDWith the change curve of Reynolds number, according to this curve and public affairs
Formula（1）, calculate and draw out aerodynamic drag with wind speed from as low as VgChange curve, find the pneumatic resistance of maximum in this curve
Power, as wind speed from as low as VgMaximum aerodynamic drag in entire wind speed range.
Other helix parameter combinations of vibration can be inhibited by reselecting, and repeat above-mentioned third to the 5th step, be obtained each
The maximum aerodynamic drag of suspension cable under group helix parameter, selects one group of helix parameter of maximum aerodynamic drag numerical value minimum,
Namely helix parameter combination when aerodynamic drag minimum, the helix parameter as optimization.
Compared with prior art, having as follows significantly a little：
After suspension cable surface wrap helix, it can reach what vibration suppression wind and rain shook by preventing the formation of continuous waterline
Effect.After winding the optimal helix of selection, compared with the case where winding other helixes, the aerodynamic drag of suspension cable is minimum.
Claims (1)
1. a kind of half parallel steel wire suspension cable double helix structure of diameter 120mm hot extruded polyethylenes, which is characterized in that in suspension cable
(1) bifilar helix of protrusion, the bifilar helix spiral winding in the same direction, helix (2) diameter d=are wound on outer surface
When 1.2mm, the maximum winding spacing of same helix (2) is S=6D；When helix (2) diameter d=1.6mm, same helix
(2) maximum winding spacing is S=12D；When helix (2) diameter d=2.0mm, the maximum winding spacing of same helix (2)
For S=12D；D is the diameter of suspension cable (1), D=120mm；
Design parameter：For the suspension cable of diameter 120mm, bifilar helix is wound in suspension cable outer surface, helix is a diameter of
1.2mm, it is 6 times of suspension cable diameters, i.e. S=720mm that can inhibit the maximum winding spacing that wind and rain shakes；Helix is a diameter of
1.6mm, it is 12 times of suspension cable diameters, i.e. S=1440mm that can inhibit the maximum winding spacing that wind and rain shakes；Helix is a diameter of
It is 12 times of suspension cable diameters, i.e. S=1440mm that can inhibit the maximum winding spacing that wind and rain shakes in the case of 2.0mm；
The suspension cable (1) is steel wire strand, per share steel wire outer wrapping steel wire grease protective layer (5), core outer wrapping steel wire anti-corrosion
Protective layer (4), outermost layer are hot extrusion PE wrap jackets (3), and helix (2) is wrapped in PE wrap jackets (3) outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621074995.7U CN207672430U (en) | 2016-09-23 | 2016-09-23 | Half parallel steel wire suspension cable double helix structure of diameter 120mm hot extruded polyethylenes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621074995.7U CN207672430U (en) | 2016-09-23 | 2016-09-23 | Half parallel steel wire suspension cable double helix structure of diameter 120mm hot extruded polyethylenes |
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| Publication Number | Publication Date |
|---|---|
| CN207672430U true CN207672430U (en) | 2018-07-31 |
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| CN201621074995.7U Active CN207672430U (en) | 2016-09-23 | 2016-09-23 | Half parallel steel wire suspension cable double helix structure of diameter 120mm hot extruded polyethylenes |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109241688A (en) * | 2018-11-09 | 2019-01-18 | 石家庄铁道大学 | A kind of determination method, system and the terminal device of suspension cable aerodynamic drag |
| CN109446703A (en) * | 2018-11-09 | 2019-03-08 | 石家庄铁道大学 | A kind of suspension cable aerodynamic drag determines method, apparatus and terminal device |
| CN110004752A (en) * | 2019-04-22 | 2019-07-12 | 柳州欧维姆机械股份有限公司 | A kind of sheet clamping type group anchor cable and its processing unit (plant) with polyurea protection coating |
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2016
- 2016-09-23 CN CN201621074995.7U patent/CN207672430U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109241688A (en) * | 2018-11-09 | 2019-01-18 | 石家庄铁道大学 | A kind of determination method, system and the terminal device of suspension cable aerodynamic drag |
| CN109446703A (en) * | 2018-11-09 | 2019-03-08 | 石家庄铁道大学 | A kind of suspension cable aerodynamic drag determines method, apparatus and terminal device |
| CN109446703B (en) * | 2018-11-09 | 2021-07-27 | 石家庄铁道大学 | Stay cable aerodynamic resistance determination method and device and terminal equipment |
| CN109241688B (en) * | 2018-11-09 | 2021-08-03 | 石家庄铁道大学 | Method and system for determining pneumatic resistance of stay cable and terminal equipment |
| CN110004752A (en) * | 2019-04-22 | 2019-07-12 | 柳州欧维姆机械股份有限公司 | A kind of sheet clamping type group anchor cable and its processing unit (plant) with polyurea protection coating |
| CN110004752B (en) * | 2019-04-22 | 2023-11-14 | 柳州欧维姆机械股份有限公司 | Clamping piece type group anchor inhaul cable with polyurea protective coating and processing device thereof |
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