CN112878177A - Sleeve type vibration control device for suspension cable of suspension bridge - Google Patents
Sleeve type vibration control device for suspension cable of suspension bridge Download PDFInfo
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- CN112878177A CN112878177A CN202110152318.1A CN202110152318A CN112878177A CN 112878177 A CN112878177 A CN 112878177A CN 202110152318 A CN202110152318 A CN 202110152318A CN 112878177 A CN112878177 A CN 112878177A
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- outer sleeve
- sleeve
- inner sleeve
- sling
- conductor plate
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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
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a sleeve type vibration control device of a suspension bridge sling, which comprises an inner sleeve, an outer sleeve, damping fillers, a connecting plate and a conductor plate, wherein the inner sleeve is fixedly connected with the outer sleeve; the inner sleeve is sleeved outside the sling, the sling is provided with damping fillers between the inner sleeves, the outer sleeve is sleeved outside the inner sleeve, a connecting plate and a conductor plate are arranged between the inner sleeve and the outer sleeve, two ends of the connecting plate are fixedly connected with the inner sleeve and the outer sleeve respectively, the conductor plate is installed on the inner sleeve, a conductor plate accommodating port is arranged on the side wall of the outer sleeve along the axial direction, a magnetic field is arranged between two side walls of the conductor plate accommodating port parallel to the axis of the outer sleeve, and the conductor plate can penetrate through the conductor plate accommodating port and. The device can effectively eliminate the vibration of the sling and ensure the safety of the bridge.
Description
Technical Field
The invention relates to a suspension bridge vibration control device, in particular to a sleeve type vibration control device for a suspension cable of a suspension bridge.
Background
Due to the characteristics of stress and geometry, the large-span bridge is very easy to be influenced by factors such as wind, earthquake, traffic load and the like to generate obvious vibration. To a certain extent, this vibration amplitude threatens the safe operation of the bridge. The data show that wind-induced vibration has caused at least 11 suspension bridges in the world to collapse since 1918. The suspension bridge has small lateral rigidity, small damping, small beam rigidity and large slenderness ratio of the suspension cable, so that wind-induced flutter, buffeting and vortex vibration are easily generated, resonance is easily generated when the structural frequency is close to the wind load frequency, the interaction between the suspension cable and the beam is further strengthened, and the structural damage is caused. In order to suppress and reduce the vibration, besides taking reasonable parameters in the structural design, another common measure is to adopt a structural vibration control technology, wherein the passive control technology is widely researched and applied to domestic and foreign bridge structures. However, the existing passive bridge control system generally has the following problems:
three major control methods, namely pneumatic measures, structural measures and additional dampers, are available in the aspect of sling vibration reduction. The pneumatic measure is only suitable for the vibration reduction of the single-factor sling with the known vibration mechanism and is not suitable for the wind vibration under the condition of unclear vibration mechanism and multi-factor coupling; by adopting structural measures, such as a method of adding an auxiliary rope and a separator in a suspender, although the construction is convenient, the engineering is attractive, in addition, the self-vibration frequency of the suspender is only changed, the energy consumption effect is not realized, and the vibration energy can also be transmitted to a beam; although the damper can dissipate part of vibration energy, the installation position of the damper is limited because the sling is generally long, the negative damping is large during vibration starting, the delay effect is obvious, and the effectiveness of the damper is greatly reduced. The conventional damper arranged on the sling is mostly a viscous damper and is separated from the sling, so that the viscous damper is easy to lose effectiveness under the influence of weather, and the appearance is complicated to influence the appearance.
The conventional passive control TMD device with the mass block is generally automatically started when the structure vibrates, and the suspension cable structure is low in overall rigidity and large in deformation, so that time delay starting is often caused, phase difference is generated between the vibration and the design value of an actual control system, the effect is poor, and even counteraction is caused under the condition of complex vibration mode, so that the passive control TMD device is not suitable for the suspension cable structure.
Other vibration damping devices are mostly exposed and are easily influenced by the environment, so that the reliability and the durability of the system are reduced.
Disclosure of Invention
The invention provides a sleeve type vibration control device for a suspension cable of a suspension bridge, which solves the problems that when the conventional vibration control device is used for the suspension cable, the vibration control effect is poor, the external equipment is not easy to maintain, the structure is complex, the appearance is not elegant, and the like.
The technical means adopted by the invention are as follows:
a sleeve type vibration control device of a suspension bridge sling comprises an inner sleeve, an outer sleeve, damping fillers, a connecting plate and a conductor plate;
the improved cable conductor comprises a cable, an inner sleeve, a connecting plate, a conductor plate and a damping filler, wherein the inner sleeve is sleeved outside the cable, the cable is arranged between the inner sleeve and the damping filler, the outer sleeve is sleeved outside the inner sleeve and is provided with a vibration gap between the outer sleeve and the inner sleeve, the inner sleeve is provided with the conductor plate between the outer sleeve, two ends of the connecting plate are respectively fixedly connected with the inner sleeve and the outer sleeve, the conductor plate is arranged on the inner sleeve, a conductor plate accommodating port is arranged on the side wall of the outer sleeve along the axial direction, a magnetic field is arranged between two side walls of the conductor plate accommodating port parallel to the axis of the outer sleeve, and.
Further, the inner sleeves comprise a first inner sleeve, a second inner sleeve and a third inner sleeve;
the outer sleeve comprises a first outer sleeve, a second outer sleeve and a third outer sleeve;
the connecting plates comprise a first connecting plate and a second connecting plate;
the first inner sleeve is arranged at the upper end of the sling, the first outer sleeve is sleeved outside the first inner sleeve, the upper end of the first outer sleeve is fixedly connected with the main rope, and a plurality of first connecting plates are circumferentially arranged between the first outer sleeve and the first inner sleeve;
the second inner sleeve is arranged on the sling, four conductor plates are uniformly distributed and fixed on the second inner sleeve in the circumferential direction, the second outer sleeve is sleeved outside the second inner sleeve, the upper end of the second outer sleeve is fixedly connected with the lower end of the first outer sleeve, and the side wall of the second outer sleeve is provided with a conductor plate accommodating opening corresponding to the conductor plates;
the third inner sleeve is arranged at the lower end of the sling, the third outer sleeve is sleeved outside the third inner sleeve, the upper end of the third outer sleeve is fixedly connected with the lower end of the second outer sleeve, the lower end of the third outer sleeve is fixedly connected with the bridge structure, and a plurality of second connecting plates are circumferentially arranged between the third outer sleeve and the third inner sleeve.
Further, the inner casing comprises a plurality of inner casing units;
the outer sleeve comprises a plurality of outer sleeve units with the same number as the inner sleeve units;
the plurality of inner sleeve units are sequentially arranged on the sling from one side of the bridge structure to one side of the main cable, and the plurality of outer sleeve units are sequentially sleeved outside the inner sleeve units from one side of the bridge structure to one side of the main cable;
two conductor plate accommodating openings are uniformly distributed on the outer wall of the outer sleeve unit,
the inner sleeve unit is uniformly provided with two conductor plates, two connecting plates are uniformly arranged between the outer sleeve unit and the corresponding inner sleeve unit, and the conductor plates and the connecting plates are arranged at intervals of 90 degrees;
the outer sleeve unit, the inner sleeve unit, the conductor plate and the connecting plate form a sleeve damping unit;
the connecting plates of two adjacent sleeve damping units are arranged at intervals of 90 degrees.
Further, the inner sleeve is hinged to the conductor plate, and the conductor plate comprises a steel plate and copper plates arranged on two side faces of the steel plate.
Further, the connecting plate is an elastic plate.
Furthermore, the outer sleeve is made of permanent magnet steel or magnetic poles are arranged on two side walls, parallel to the axis of the outer sleeve, of the conductor plate accommodating opening.
Furthermore, the first inner sleeve, the second inner sleeve, the third inner sleeve, the first outer sleeve, the second outer sleeve and the third outer sleeve are of split structures, and connecting flanges are arranged at two ends of the first outer sleeve, the second outer sleeve and the third outer sleeve.
Furthermore, the inner sleeve unit and the outer sleeve unit are of split structures, and connecting flanges are arranged at two ends of the outer sleeve unit.
Further, the damping filler is a plastic hose, modified asphalt or a damping rubber pipe.
Compared with the prior art, the sleeve type vibration control device of the suspension bridge sling disclosed by the invention has the advantages that the inner sleeve, the outer sleeve, the damping filler, the connecting plate and the conductor plate are arranged on the sling to form a TMD vibration-resistant structure, so that the vibration of the sling can be effectively eliminated, and the purposes of reducing the vibration amplitude and the duration time of the main beam and the sling are achieved.
Drawings
FIG. 1 is a block diagram of a first embodiment of the telescopic vibration control device of the suspension bridge sling disclosed in the present invention;
FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken at B-B of FIG. 1;
FIG. 4 is a cross-sectional view taken at C-C of FIG. 1;
FIG. 5 is a structural view of a second embodiment of the telescopic vibration control device of the suspension bridge sling disclosed in the present invention;
FIG. 6 is a cross-sectional view taken at C-C of FIG. 5;
fig. 7 is a cross-sectional view taken at D-D in fig. 5.
Detailed Description
Example 1
The suspension bridge is a bridge using a main rope suspended on a cable tower anchored on both banks as an upper main bearing component, and as shown in fig. 1, 2 and 3, the suspension bridge is a first embodiment of a casing pipe type vibration control device of a suspension cable of the suspension bridge, which comprises an inner casing pipe 1, an outer casing pipe 2, a damping filler 3, a connecting plate 4 and a conductor plate 5;
the utility model discloses a conductor board, including interior sleeve pipe 1 cover outside hoist cable 60, hoist cable 60 with be equipped with between interior sleeve pipe 1 damping filler 3, outer tube 2 cover interior sleeve pipe 1 is outer just outer sleeve pipe 2 with form vibration gap 7 between the interior sleeve pipe 1, interior sleeve pipe 1 with be equipped with between the outer sleeve pipe 2 connecting plate 4 with conductor board 5, 4 both ends of connecting plate respectively with interior sleeve pipe 1 with outer sleeve pipe 2 fixed connection, conductor board 5 is installed on interior sleeve pipe 1, be equipped with conductor board receiving opening 24 along axial direction on the outer sleeve pipe 2 lateral wall, conductor board receiving opening 24 has a magnetic field between the both sides wall that is on a parallel with the outer sleeve pipe axis, conductor board 5 can pass conductor board receiving opening 24 and cutting magnetic field.
Specifically, as shown in fig. 1, a main cable 61 is suspended on a cable tower on both sides, a connection hoop 63 is fixed on the main cable 61, the connection hoop 63 is fixed by a connection hoop bolt 64, the connection hoop 63 is fixedly connected with a sling 60 by a sling connection bolt 65, and the lower end of the sling 60 is fixedly connected with a bridge structure 62 by an anchoring sling anchor 66. The inner sleeves comprise a first inner sleeve 11, a second inner sleeve 12 and a third inner sleeve 13;
the outer sleeves comprise a first outer sleeve 21, a second outer sleeve 22 and a third outer sleeve 23;
the connecting plates include a first connecting plate 40 and a second connecting plate 41;
the first inner sleeve 11 is arranged at the upper end of the sling 460, the first outer sleeve 21 is sleeved outside the first inner sleeve 11, the upper end of the first outer sleeve 21 is fixedly connected with the main rope 61, and a plurality of first connecting plates 40 are circumferentially arranged between the first outer sleeve 21 and the first inner sleeve 11;
the second inner sleeve 12 is arranged on the sling 60, four conductor plates 5 are uniformly distributed and fixed on the second inner sleeve 12 in the circumferential direction, the second outer sleeve 22 is sleeved outside the second inner sleeve 12, the upper end of the second outer sleeve is fixedly connected with the lower end of the first outer sleeve 21, and the side wall of the second outer sleeve 22 is provided with the conductor plate accommodating port 24 corresponding to the conductor plates;
the third inner sleeve 13 is arranged at the lower end of the sling 60, the third outer sleeve 23 is sleeved outside the third inner sleeve 13, the upper end of the third outer sleeve 23 is fixedly connected with the lower end of the second outer sleeve 22, the lower end of the third outer sleeve 23 is fixedly connected with a bridge structure 62, and a plurality of second connecting plates 41 are circumferentially arranged between the third outer sleeve 23 and the third inner sleeve 13.
The working principle of the telescopic vibration control device for the suspension bridge sling disclosed in the embodiment is as follows: when the guy cable is vibrated by external factors, the guy cable drives other components directly connected with the guy cable, namely the inner sleeve, the conductor plate, the corresponding connecting component (connecting plate) and the like to vibrate together, the upper end part and the lower end part of the system are connected with the bridge body, and the vibration form of the system is similar to a cable structure fixedly connected with two ends. After the vibration occurs, because the linear density proportion and the rigidity of the stay cable, the inner sleeve structure and the outer sleeve structure are different, the vibration characteristics are different inevitably, and the relative distance between the inner sleeve and the outer sleeve in the whole vibration process is changed constantly. Therefore, the conductor plate directly connected with the second inner sleeve pipe continuously moves in the conductor plate accommodating opening of the second outer sleeve pipe, the conductor plate continuously performs cutting motion in a magnetic field in the process, and then eddy current is formed, the resistance of the eddy current is used as counter force to prevent the relative motion, the resistance is finally transmitted to the stay rope through the conductor plate and the connecting member (connecting plate), the continuation of the vibration of the stay rope is restrained, and meanwhile, the counter force also acts on the outer sleeve pipe. The conductor plates are arranged orthogonally along the axial direction of the sling, so that the vibration reduction effect can be realized for the vibration of the sling in any direction; the conductor plates are continuously arranged along the axial direction, so that damping force can be generated in the length range of the full sling, and the vibration attenuation process is accelerated. The main effect of the connecting plates at the upper end and the lower end of the sling is similar to a spring device, and the vibration characteristic of the sling structure shows that the closer the sling vibrates, the smaller the vibration amplitude of the restraint section is, so that an eddy current conductor plate does not need to be made at the end part, and the connecting plates are adopted for connection, so that the stability of the structure is improved, and the complexity is reduced. Finally, the vibration amplitude of the inner sleeve and the outer sleeve is attenuated continuously along with the action of the eddy current damping force. When the vibration tends to disappear, relative movement does not exist between the inner sleeve and the outer sleeve, at the moment, the conductor plate and the conductor plate accommodating opening are relatively static, the eddy current disappears, and acting force is not generated any more. This structure will produce three kinds of power in fact and go to restrain the influence of earthquake or wind vibration to bridge structures: one is the eddy current damping force generated by the conductor plate; the second is that the outer sleeve generates reverse inertia force due to the difference of the self-vibration frequency of the sling; thirdly, the sling increases damping force for increasing a damping material pipe, so that better vibration damping effect can be obtained.
Further, the first inner sleeve 11, the second inner sleeve 12, the third inner sleeve 13, the first outer sleeve 21, the second outer sleeve 22 and the third outer sleeve 23 are separate structures, and connecting flanges are arranged at two ends of the first outer sleeve 21, the second outer sleeve 22 and the third outer sleeve 23. Specifically, the first inner sleeve is of a split structure and comprises a plurality of arc-shaped first inner sleeve segments 110, wherein the number of the first inner sleeve segments is 4, the two sides of each first inner sleeve segment 110 are provided with first connecting bulges 111, each first connecting bulge 111 is provided with a through hole or a threaded hole, the 4 arc-shaped first inner sleeve segments 110 can form an integrated structure through bolts, and when the first inner sleeve segments are connected into a whole through the bolts 25, the first inner sleeve can be sleeved on a sling and locked on the sling. First outer tube 21 cover is outside first interior sleeve pipe 11, first outer tube 21 both ends are equipped with first outer tube flange 210, it is even to be equipped with the connection method on the connection cuff 63, first outer tube passes through flange fixed connection with the connection cuff, in this embodiment, first outer tube also is the components of a whole that can function independently structure, including a plurality of first outer tube pieces 211, be 4 in the picture, the both sides of first outer tube piece are equipped with the second and connect protruding 212, be equipped with through-hole or screw hole on the protruding 212 of second connection, can link into an organic whole structure with a plurality of first outer tube pieces through the bolt. A plurality of first connecting plates 40, 4 in the figure, are arranged between the first inner sleeve and the first outer sleeve, two ends of each first connecting plate are respectively fixed on the first inner sleeve and the first outer sleeve through connecting bolts, but the screws of the first connecting plates are oval, so that certain displacement can be generated between the inner sleeve and the outer sleeve during vibration (the same is shown in the lower part 41).
As shown in fig. 4, a third inner sleeve 13 is fixed on the lower portion of the sling, in this embodiment, the third inner sleeve is a split structure and includes a plurality of circular arc-shaped third inner sleeve segments 130, 4 in the figure, fifth connecting protrusions 131 are provided on both sides of the third inner sleeve segments 130, through holes or threaded holes are provided on the fifth connecting protrusions 131, the 4 circular arc-shaped third inner sleeve segments 130 can form an integrated structure through bolts, and when the plurality of third inner sleeve segments are connected to form an integrated structure through the bolts, the third inner sleeve can be sleeved on the sling and locked on the sling. Third outer tube 23 cover is outside interior sleeve pipe 13 in the third, and third outer tube 23 both ends are equipped with third outer tube flange 230, and third outer tube lower extreme passes through flange fixed connection with the bridge structures, and in this embodiment, third outer tube 22 also is the components of a whole that can function independently structure, including a plurality of third outer tube piece 231, is 4 in the picture, and the both sides of third outer tube piece 231 are equipped with sixth connection arch 232, are equipped with through-hole or screw hole on the sixth connection arch 232, can link into an organic whole structure with a plurality of third outer tube pieces through the bolt. A plurality of second connecting plates 41, 4 in the figure, are arranged between the third inner sleeve and the third outer sleeve, and two ends of each second connecting plate are respectively fixed on the third inner sleeve and the third outer sleeve through connecting bolts.
As shown in fig. 3, a second inner sleeve 12 is fixed on the sling between the first inner sleeve 11 and the third inner sleeve 13, the connection manner of the second inner sleeve and the sling is the same as that of the first inner sleeve or that of the third inner sleeve and the sling, in this embodiment, the second inner sleeve is also a split structure, and includes 4 second inner sleeve segments 120, third connecting protrusions 121 are provided on two sides of the second inner sleeve segments 120, threaded holes or through holes are provided on the third connecting protrusions, and can be connected into an integrated structure through connecting bolts, a second outer sleeve 22 is sleeved on the second inner sleeve 12, second outer sleeve connecting flanges 220 are provided on two ends of the second outer sleeve and are respectively fixedly connected with the first outer sleeve connecting flange 210 and the third outer sleeve connecting flange 230, in this embodiment, the second outer sleeve is also a split structure, and includes 4 second outer sleeve segments 221, and fourth connecting protrusions 222 are provided on two sides of the second outer sleeve segments, and a conductor plate accommodating opening is formed between every two adjacent fourth connecting bulges. Four conductor plates 5 are uniformly distributed and fixed on the second inner sleeve in the circumferential direction, the second outer sleeve 22 is sleeved on the second inner sleeve 12, the upper end of the second outer sleeve is fixedly connected with the lower end of the first outer sleeve 21, and the second outer sleeve is made of permanent magnet steel segments or magnetic poles are arranged on two side walls, parallel to the axis of the outer sleeve, of the conductor plate accommodating port so that a magnetic field is formed at the conductor plate accommodating port. The inner sleeve and the outer sleeve are of split structures, and are convenient to process and install.
Furthermore, the inner sleeve is hinged to the conductor plate, the conductor plate comprises a steel plate and copper plates arranged on two side faces of the steel plate, the copper plate is an electric conductor plate, the iron plate is a magnetic conducting plate, and the main purpose is to reduce magnetic leakage of a magnetic circuit and realize a closed loop and improve the efficiency of eddy current damping, in the embodiment, a one-way hinge 14 is arranged between every two adjacent sixth connecting protrusions, the one-way hinge 14 is fixed on the third inner sleeve through a connecting bolt and is connected with the conductor plate, the conductor plate can rotate for a certain angle in a horizontal plane through the one-way hinge, and the conductor plate is hinged to the inner sleeve, so that when the relative displacement is generated between the inner sleeve and the outer sleeve due to the vibration of the sling, the conductor plate is ensured to freely move within a set range (the width range of the conductor plate accommodating opening), and the displacement limitation caused by the contact between the conductor plate and, affecting the damping effect.
Furthermore, the connecting plate is an elastic plate, and when the sling vibrates violently, the elastic plate can well reduce the impact load borne by the end of the sling.
Furthermore, the damping filler can be directly sleeved on the sling by adopting various plastic hoses, modified asphalt or damping rubber pipes, can be filled by bulk materials, can also be in a split structure, is connected to the inner sleeve valve, and is installed together after the sling is installed, and the damping filler is arranged so that the part of the damping filler is deformed due to vibration of the sling when the sling vibrates, thereby consuming energy and improving the vibration reduction effect.
Example 2
Fig. 5, 6 and 7 show a second embodiment of the telescopic vibration control device of the suspension bridge sling according to the present invention, which comprises an inner sleeve 1, an outer sleeve 2, a damping filler 3, a connecting plate 4 and a conductor plate 5;
the utility model discloses a conductor board, including interior sleeve pipe 1 cover outside hoist cable 60, hoist cable 60 with be equipped with between interior sleeve pipe 1 damping filler 3, outer tube 2 cover interior sleeve pipe 1 is outer just outer sleeve pipe 2 with form vibration gap 7 between the interior sleeve pipe 1, interior sleeve pipe 1 with be equipped with between the outer sleeve pipe 2 connecting plate 4 with conductor board 5, 4 both ends of connecting plate respectively with interior sleeve pipe 1 with outer sleeve pipe 2 fixed connection, conductor board 5 is installed on interior sleeve pipe 1, be equipped with conductor board receiving opening 24 along axial direction on the outer sleeve pipe 2 lateral wall, conductor board receiving opening 24 has a magnetic field between the both sides wall that is on a parallel with the outer sleeve pipe axis, conductor board 5 can pass conductor board receiving opening 24 and cutting magnetic field.
In particular, the inner casing 1 comprises a plurality of inner casing units 10;
the outer casing 2 comprises a plurality of outer casing units 20 in the same number as the inner casing units 10;
the inner sleeve units 10 are sequentially arranged on the suspension cable 60 from the side of the bridge structure 62 to the side of the main cable 61, and the outer sleeve units 20 are sequentially sleeved outside the inner sleeve units 10 from the side of the bridge structure 62 to the side of the main cable 61;
two conductor plate accommodating openings 24 are uniformly distributed on the outer wall of the outer sleeve unit 20;
the two conductor plates 5 are uniformly distributed on the inner sleeve unit 10, the two connecting plates 4 are uniformly distributed between the outer sleeve unit 20 and the corresponding inner sleeve unit 10, and the conductor plates 5 and the connecting plates 4 are arranged at intervals of 90 degrees, namely the conductor plates and the connecting plates are sequentially arranged at intervals of 90 degrees on the periphery of the inner sleeve unit;
the outer sleeve unit 20, the inner sleeve unit 10, the conductor plate 5, and the connection plate 4 form a sleeve damper unit 8;
the plurality of sleeve damping units 8 are sequentially arranged on the sling 60 from one side of the bridge structure 62 to one side of the main rope 61, the sleeve damping unit at the lowest end is arranged on the bridge structure, and the upper end of the sleeve damping unit at the uppermost end is a free end;
the connecting plates of two adjacent sleeve damping units are arranged at intervals of 90 degrees.
The working principle of the telescopic vibration control device for the suspension bridge sling disclosed in the embodiment is as follows: when the guy cable is vibrated by external factors, the guy cable drives other components directly connected with the guy cable, namely the inner sleeve, the conductor plate, the corresponding connecting component (connecting plate) and the like to vibrate together, the upper end part and the lower end part of the system are connected with the bridge body, and the vibration form of the system is similar to a cable structure fixedly connected with two ends. After the vibration occurs, because the linear density proportion and the rigidity of the stay cable, the inner sleeve structure and the outer sleeve structure are different, the vibration characteristics are different inevitably, and the relative distance between the inner sleeve and the outer sleeve in the whole vibration process is changed constantly. Therefore, the conductor plate directly connected with the second inner sleeve pipe continuously moves in the conductor plate accommodating opening of the second outer sleeve pipe, the conductor plate continuously performs cutting motion in a magnetic field in the process, and then eddy current is formed, the resistance of the eddy current is used as counter force to prevent the relative motion, the resistance is finally transmitted to the stay rope through the conductor plate and the connecting member (connecting plate), the continuation of the vibration of the stay rope is restrained, and meanwhile, the counter force also acts on the outer sleeve pipe. The conductor plates are arranged orthogonally along the axial direction of the sling, so that the vibration reduction effect can be realized for the vibration of the sling in any direction; the conductor plates are continuously arranged along the axial direction, so that damping force can be generated in the length range of the full sling, and the vibration attenuation process is accelerated. The main effect of the connecting plates at the upper end and the lower end of the sling is similar to a spring device, and the vibration characteristic of the sling structure shows that the closer the sling vibrates, the smaller the vibration amplitude of the restraint section is, so that an eddy current conductor plate does not need to be made at the end part, and the connecting plates are adopted for connection, so that the stability of the structure is improved, and the complexity is reduced. Finally, the vibration amplitude of the inner sleeve and the outer sleeve is attenuated continuously along with the action of the eddy current damping force. When the vibration tends to disappear, relative movement does not exist between the inner sleeve and the outer sleeve, at the moment, the conductor plate and the conductor plate accommodating opening are relatively static, the eddy current disappears, and acting force is not generated any more. Example 2 the overall damping principle is the same as that of example 1, and the two-way vibration control of the suspension cable can be realized, and the design method enables all the sleeve forms to be the same, and has lower complexity in production and installation (the sleeves with two sections are the same, and the sleeves can be rotated by 90 degrees in installation).
Further, the inner sleeve unit 10 and the outer sleeve unit 20 are of split structures, and connecting flanges are arranged at two ends of the outer sleeve unit. Specifically, the main cable 61 is hung on cable towers on two banks, a plurality of connecting hoops 63 are fixed on the main cable 61, the connecting hoops 63 are fixedly connected with the suspension cable 60, and the lower end of the suspension cable 60 is fixedly connected with the bridge structure 62 through an anchoring suspension cable anchor 64. Upwards being fixed with a plurality of sleeve pipe damping units 8 in proper order from the one end that is close to bridge structures on the hoist cable, in this embodiment, interior sleeve pipe unit is for dividing the body structure, including four endotheca sections of jurisdiction 11, the both sides of endotheca section of jurisdiction 11 are equipped with first connection arch 110, are equipped with through-hole or screw hole on the first connection arch 110, can link into an organic whole structure with a plurality of endotheca sections of jurisdiction through connecting bolt 9, when connecting a plurality of endotheca sections of jurisdiction through connecting bolt and forming an organic whole, interior sleeve pipe unit can overlap on the hoist cable and lock on the hoist cable. Outer tube unit 20 overlaps on interior tube unit 10, the both ends of outer tube unit 20 are equipped with flange 200, in this embodiment, outer tube unit 20 is the components of a whole that can function independently structure also, including four outer tube piece 201, the both sides of outer tube piece 201 are equipped with second and connect protruding 202, be equipped with screw hole or through-hole on the second connects protruding 202, can connect a plurality of outer tube pieces into a whole structure through connecting bolt, be equipped with two conductor board holding port 24 of relative setting on the lateral wall of outer tube unit, two conductor board holding port 24 arrange at an interval of 180 on outer tube's lateral wall promptly, and the extending direction of conductor board holding port 24 is the same with the axial direction of outer tube, be fixed with two conductor boards on interior tube unit, in this embodiment, the conductor board sets up between two interior tube pieces, the conductor board other end can insert conductor board holding port 24. Two connecting plates are fixed at positions on the inner sleeve unit, which are 90 degrees away from the conductor plate, and the other ends of the connecting plates are fixedly connected with the outer sleeve. The inner sleeve unit and the outer sleeve unit are of split structures, and are convenient to process and install.
Further, interior bushing unit with the conductor plate is articulated, the conductor plate includes the steel sheet and sets up copper on the steel sheet both sides face, the copper is the electric conductor board, and iron plate is the magnetic conduction board, and the main objective is in order to reduce the magnetic leakage realization closed circuit of magnetic circuit, improves the efficiency of eddy current damping, and in this embodiment, be connected with the conductor plate through one-way hinge 12 between the first connecting protrusion 101 of interior bushing unit, through with the conductor plate with interior bushing unit is articulated for when the relative displacement that produces between the inside and outside sleeve pipe is aroused in the hoist cable vibration, guarantee at the conductor plate in the within range (conductor plate and hold mouthful width scope) free movement of settlement, it is limited to avoid the displacement that conductor plate and conductor plate hold the lateral wall contact of mouthful and cause, influences the damping effect.
Furthermore, the connecting plate is an elastic plate, and when the sling vibrates violently, the elastic plate can well reduce the impact load borne by the end of the sling.
Furthermore, the damping filler can be directly sleeved on the sling by adopting various plastic hoses, modified asphalt or damping rubber pipes, can be filled by bulk materials, can also be in a split structure, is connected to the inner sleeve valve, and is installed together after the sling is installed, and the damping filler is arranged so that the part of the damping filler is deformed due to vibration of the sling when the sling vibrates, thereby consuming energy and improving the vibration reduction effect.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The utility model provides a bushing type vibration controlling means of suspension bridge hoist cable which characterized in that: comprises an inner sleeve (1), an outer sleeve (2), damping filler (3), a connecting plate (4) and a conductor plate (5);
the inner sleeve (1) is sleeved outside the sling (60), the damping filler (3) is arranged between the sling (60) and the inner sleeve (1), the outer sleeve (2) is sleeved outside the inner sleeve (1) and a vibration gap (7) is formed between the outer sleeve (2) and the inner sleeve (1), the connecting plate (4) and the conductor plate (5) are arranged between the inner sleeve (1) and the outer sleeve (2), two ends of the connecting plate (4) are respectively and fixedly connected with the inner sleeve (1) and the outer sleeve (2), the conductor plate (5) is arranged on the inner sleeve (1), a conductor plate accommodating opening (24) is arranged on the side wall of the outer sleeve (2) along the axial direction, the conductor plate receiving opening (24) has a magnetic field between two side walls parallel to the axis of the outer sleeve, the conductor plate (5) can be passed through the conductor plate receiving opening (24) and cut the magnetic field.
2. The telescopic vibration control device of a suspension bridge sling according to claim 1, wherein:
the inner sleeve (1) comprises a first inner sleeve (11), a second inner sleeve (12) and a third inner sleeve (13);
the outer sleeve (2) comprises a first outer sleeve (21), a second outer sleeve (22) and a third outer sleeve (23);
the connecting plate (4) comprises a first connecting plate (40) and a second connecting plate (41);
the first inner sleeve (11) is arranged at the upper end of the sling (60), the first outer sleeve (21) is sleeved outside the first inner sleeve (11), the upper end of the first outer sleeve is fixedly connected with the main rope (61), and a plurality of first connecting plates (40) are arranged between the first outer sleeve (21) and the first inner sleeve (11) in the circumferential direction;
the second inner sleeve (12) is arranged on the sling (60), four conductor plates (5) are uniformly distributed and fixed on the second inner sleeve (12) in the circumferential direction, the second outer sleeve (22) is sleeved outside the second inner sleeve (12), the upper end of the second outer sleeve is fixedly connected with the lower end of the first outer sleeve (21), and the side wall of the second outer sleeve (22) is provided with the conductor plate accommodating port (24) corresponding to the conductor plate;
the third inner sleeve (13) is arranged at the lower end of the sling (60), the third outer sleeve (23) is sleeved outside the third inner sleeve (13), the upper end of the third outer sleeve is fixedly connected with the lower end of the second outer sleeve (22), the lower end of the third outer sleeve (23) is fixedly connected with a bridge structure (62), and a plurality of second connecting plates (41) are circumferentially arranged between the third outer sleeve (23) and the third inner sleeve (13).
3. The telescopic vibration control device of a suspension bridge sling according to claim 1, wherein:
the inner sleeve comprises a plurality of inner sleeve units;
the outer sleeve comprises a plurality of outer sleeve units with the same number as the inner sleeve units;
the plurality of inner sleeve units are sequentially arranged on the sling from one side of the bridge structure to one side of the main cable, and the plurality of outer sleeve units are sequentially sleeved outside the inner sleeve units from one side of the bridge structure to one side of the main cable;
two conductor plate accommodating openings are uniformly distributed on the outer wall of the outer sleeve unit;
the inner sleeve unit is uniformly provided with two conductor plates, two connecting plates are uniformly arranged between the outer sleeve unit and the corresponding inner sleeve unit, and the conductor plates and the connecting plates are arranged at intervals of 90 degrees;
the outer sleeve unit, the inner sleeve unit, the conductor plate and the connecting plate form a sleeve damping unit;
the connecting plates of two adjacent sleeve damping units are arranged at intervals of 90 degrees.
4. The telescopic vibration control device of a suspension bridge sling according to claim 2 or 3, wherein: the inner sleeve is hinged with the conductor plate, and the conductor plate comprises a steel plate and copper plates arranged on two side faces of the steel plate.
5. The telescopic vibration control device of a suspension bridge sling according to claim 1, wherein: the connecting plate is an elastic plate.
6. The telescopic vibration control device of a suspension bridge sling according to claim 1, wherein: the outer sleeve is made of permanent magnet steel or magnetic poles are arranged on two side walls, parallel to the axis of the outer sleeve, of the conductor plate accommodating opening.
7. The telescopic vibration control device of a suspension bridge sling according to claim 2, wherein: the first inner sleeve (11), the second inner sleeve (12), the third inner sleeve (13), the first outer sleeve (21), the second outer sleeve (22) and the third outer sleeve (23) are of split structures, and connecting flanges are arranged at two ends of the first outer sleeve (21), the second outer sleeve (22) and the third outer sleeve (23).
8. The telescopic vibration control device of a suspension bridge sling according to claim 3, wherein: the inner sleeve unit and the outer sleeve unit are of split structures, and connecting flanges are arranged at two ends of the outer sleeve unit.
9. The telescopic vibration control device of a suspension bridge sling according to claim 1, wherein: the damping filler is a plastic hose, modified asphalt or a damping rubber pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110152318.1A CN112878177B (en) | 2021-02-03 | 2021-02-03 | Sleeve type vibration control device for suspension bridge sling |
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| CN202110152318.1A CN112878177B (en) | 2021-02-03 | 2021-02-03 | Sleeve type vibration control device for suspension bridge sling |
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| CN112878177A true CN112878177A (en) | 2021-06-01 |
| CN112878177B CN112878177B (en) | 2023-04-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113235430A (en) * | 2021-06-15 | 2021-08-10 | 大连交通大学 | Sleeve type vibration damper for cable bridge inhaul cable |
| CN117373219A (en) * | 2023-10-11 | 2024-01-09 | 合肥工业大学 | Short boom longitudinal bridge direction deviation early warning device and method |
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| CN117373219B (en) * | 2023-10-11 | 2024-05-17 | 合肥工业大学 | Short boom longitudinal bridge direction deviation early warning device and method |
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|---|---|
| CN112878177B (en) | 2023-04-28 |
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