CN105220611A - The structure but the streamline molding box beam girder whirlpool with central drainage pipe shakes - Google Patents
The structure but the streamline molding box beam girder whirlpool with central drainage pipe shakes Download PDFInfo
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- CN105220611A CN105220611A CN201510646732.2A CN201510646732A CN105220611A CN 105220611 A CN105220611 A CN 105220611A CN 201510646732 A CN201510646732 A CN 201510646732A CN 105220611 A CN105220611 A CN 105220611A
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- central drainage
- drainage pipe
- box beam
- molding box
- whirlpool
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Abstract
But the invention discloses a kind of streamline molding box beam whirlpool with central drainage pipe to shake structure, for suppressing the generation of the Longspan Bridge streamline molding box beam vortex-induced vibration with central drainage pipe, it is characterized in that, the cross section of central drainage pipe is flat-shaped, and ensures that the flakiness ratio B/H of central drainage pipeline is not less than 5; The clearance D of pipeline and girder skew web plate is not less than 10cm; Thickness H is not higher than 20cm; And need ensure that central drainage pipeline is placed in position on the upper side on skew web plate.Cause the separation of air-flow after the aerodynamic arrangement of the present invention's structure effectively overcomes girder bottom hung large scale circular row waterpipe and form the shortcoming of whirlpool, reduce the whirlpool amplitude that even inhibit streamline molding box beam girder, improve the comfortableness used, ensure that the structural safety of bridge.
Description
Technical field
The present invention relates to wind engineering of bridge field, particularly relate to Longspan Bridge streamline molding box beam vortex-induced vibration control field.
Background technology
The streamline molding box beam that Longspan Bridge generally adopts has good aerodynamic configuration, and aerodynamic stability is better, lessly occurs the wind-induced vibration such as flutter, vortex-induced vibration phenomenon.In recent years along with the raising of national environmental protection consciousness, regulation is put into effect in multiple province, forbids the dirt of the rain of bridge floor to be discharged directly into river by drain hole, must by dirty for the rain of the bridge floor city planting ductwork being caused two sides by the drainage pipe be arranged on bottom girder.Usual gutter is designed to circular water pipe (diameter about 50cm) (Fig. 1).And the profile of main beam section plays vital effect to its aerodynamic stability, the large-sized drainage pipe of girder bottom hung can cause the separation of air-flow and form whirlpool, very easily cause the vortex-induced vibration of girder, thus affect comfort, even affect structural safety.
Present invention applicant finds in the research work of Separated Twin-box Girder vortex-induced vibration early stage, under the flow prerequisite that maintenance is identical with circular row water pipe, be the flat-shaped water pipe with certain the ratio of width to height by pipe design, the whirlpool of girder can be made to shake reduction (Fig. 2).But when this construction measure being applied to streamline molding box beam, the vortex-induced vibration of girder is not effectively suppressed.
Summary of the invention
In view of the above deficiency of prior art, the object of the invention is to propose a kind of drain structure significantly not affecting girder aerodynamic configuration, make it the above-mentioned deficiency overcoming prior art, thoroughly eliminate or significantly reduce the whirlpool amplitude of Longspan Bridge streamline molding box beam.
The means realizing the object of the invention employing are:
The structure but the streamline molding box beam girder whirlpool with central drainage pipe shakes, for suppressing the generation of the Longspan Bridge streamline molding box beam vortex-induced vibration with central drainage pipe.Guaranteed flow is constant, and the cross section of central drainage pipe is designed to flat-shaped, and ensures that the flakiness ratio B/H of central drainage pipeline is not less than 5; Thickness H is not higher than 20cm; The clearance D of pipeline and girder skew web plate is not less than 10cm; And central drainage pipeline is placed in position on the upper side on skew web plate.
Further, when to traffic requirement height, drainage pipe should be arranged downwards, but drainage pipe lower than 32%, when requiring higher to comfort, when namely requiring that whirlpool amplitude is less, should upwards can not be arranged by L1/L as far as possible.
As preferably, drainage pipe is arranged on L1/L>52% position.
The aerodynamic arrangement of the present invention's structure effectively overcomes the large-sized drainage pipe of girder bottom hung and causes flow separation and form the shortcoming of whirlpool, reduce the whirlpool amplitude of streamline molding box beam girder, increase the comfortableness used, ensure that the structural safety of streamline molding box beam girder.
Accompanying drawing explanation
Fig. 1 installs circular row waterpipe bottom prior art streamline molding box beam.
Fig. 2 installs circular row waterpipe and flat pipeline bottom prior art Separated Twin-box Girder.
Fig. 3 installs Flat drain pipe road schematic diagram bottom embodiment of the present invention streamline molding box beam.
Fig. 4 is embodiment of the present invention Flat drain pipe road size and installation site schematic diagram.
Detailed description of the invention
Below by concrete example with reference, further detailed description is done to the present invention.
Embodiment one
Composition graphs 3 and Fig. 4 can find out, a kind of detailed description of the invention of the present invention is: but to shake structure with the streamline molding box beam whirlpool of central drainage pipe, for suppressing the generation of the Longspan Bridge streamline molding box beam vortex-induced vibration with central drainage pipe, 1 is central drainage pipe, 2 is bridge floor mozzle, 3 is the bracing frame of central drainage pipe, and 4 is the skew web plate of streamline molding box beam girder.The rain stream of bridge floor confluxes in central drainage pipe 1 by bridge floor mozzle 2, H is the thickness of central drainage pipe, B is the width of central drainage pipe, and L is the width of the skew web plate of streamline molding box beam girder, and L1 is along the length being projected to edge under skew web plate on skew web plate under central drainage pipeline.The cross section of central drainage pipe is flat-shaped.The flakiness ratio B/H of central drainage pipeline is not less than 5; The thickness H of central drainage pipe is not higher than 20cm; The clearance D of pipeline and girder skew web plate is not less than 10cm; Central drainage pipeline is placed in position on the upper side on skew web plate.
In the present embodiment, L is 623cm; L1 is 325cm, B be 100cm, H be 20cm, D is 22cm.
Claims (3)
- But 1. to shake structure with the streamline molding box beam girder whirlpool of central drainage pipe, for suppressing the generation of the Longspan Bridge streamline molding box beam vortex-induced vibration with central drainage pipe, it is characterized in that, guaranteed flow is constant, the cross section of central drainage pipe is designed to flat-shaped, and ensures that the flakiness ratio B/H of central drainage pipeline is not less than 5; Thickness H is not higher than 20cm; The clearance D of pipeline and girder skew web plate is not less than 10cm; Central drainage pipeline is placed in position on the upper side on skew web plate.
- 2. but the streamline molding box beam whirlpool with central drainage pipe according to claim 1 shakes structure, it is characterized in that, the position that described central drainage pipeline is placed on skew web plate is: central drainage install pipeline is at the position of L1/L>32%, wherein, L1 is along the length being projected to edge under skew web plate on skew web plate under central drainage pipeline; L is skew web plate width.
- 3. but the streamline molding box beam girder whirlpool with central drainage pipe according to claim 2 shakes structure, and it is characterized in that, drainage pipe is arranged on L1/L>52% position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510646732.2A CN105220611B (en) | 2015-10-08 | 2015-10-08 | Vortex vibration suppression structure for streamline main box girder with concentrated drainage pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510646732.2A CN105220611B (en) | 2015-10-08 | 2015-10-08 | Vortex vibration suppression structure for streamline main box girder with concentrated drainage pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105220611A true CN105220611A (en) | 2016-01-06 |
| CN105220611B CN105220611B (en) | 2017-01-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510646732.2A Expired - Fee Related CN105220611B (en) | 2015-10-08 | 2015-10-08 | Vortex vibration suppression structure for streamline main box girder with concentrated drainage pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105220611B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540460A (en) * | 2018-12-25 | 2019-03-29 | 西南交通大学 | A kind of double box beam whole bridge emulation girder core beam constructional forms of large span |
-
2015
- 2015-10-08 CN CN201510646732.2A patent/CN105220611B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540460A (en) * | 2018-12-25 | 2019-03-29 | 西南交通大学 | A kind of double box beam whole bridge emulation girder core beam constructional forms of large span |
| CN109540460B (en) * | 2018-12-25 | 2023-09-29 | 西南交通大学 | Large-span double-box-girder full-bridge pneumatic elastic model girder core beam construction form |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105220611B (en) | 2017-01-25 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170125 Termination date: 20191008 |