CN103742585A - Stay cable permanent magnet eddy current damper and damping generation method - Google Patents
Stay cable permanent magnet eddy current damper and damping generation method Download PDFInfo
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- CN103742585A CN103742585A CN201410004795.3A CN201410004795A CN103742585A CN 103742585 A CN103742585 A CN 103742585A CN 201410004795 A CN201410004795 A CN 201410004795A CN 103742585 A CN103742585 A CN 103742585A
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- face
- driven gear
- suspension cable
- damping
- dish
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Abstract
The invention discloses a stay cable permanent magnet eddy current damper and a damping generation method and relates to the field of bridge structure vibration control. The damper comprises a bottom board, a supporting seat, a connecting rod, a lever and a damping generation device, wherein the supporting seat is fixedly arranged above the bottom board, the lever is movably connected with the connecting rod and the supporting seat, the damping generation device comprises an out-of-plane driving gear and an out-of-plane driven gear, the out-of-plane driving gear is fixedly disposed at the bottom end of the connecting rod and meshed with the out-of-plane driven gear, a damping shaft is fixedly inserted into the center of the out-of-plane driven gear, and one or two groups of devices for performing actions of cutting magnetic line of force are sleeved on the damping shaft. When a stay cable vibrates, an out-of-plane conductor plate and an in-plane conductor plate in the devices for performing actions of cutting magnetic line of force perform the actions of cutting the magnetic line of force in a permanent magnet magnetic field to generate eddy-current damping, so that the vibrating energy of the stay cable can be consumed, in-plane and out-of-plane vibrations of the stay cable can be simultaneously effectively controlled, the damping coefficient is stable, and the damper can be adapted to changes of various temperatures.
Description
Technical field
The present invention relates to bridge structure vibration control field, is specifically a kind of suspension cable permanent-magnet type eddy current damper and damping generation method.
Background technique
Suspension cable belongs to the main Force transmission parts of cable stayed bridge, suspension cable is that high-strength steel skein silk system, outside hot extrude PE sheath are made, in long span stayed-cable bridge, the length of suspension cable itself reaches hundreds of rice, under the external actions such as the suspension cable end excitation causing at extraneous wind load, wind and rain synergy, vehicular load, can there is significantly space oscillations, its oscillation trajectory is oval, the long axis direction that the in plane vibration direction of suspension cable is elliptical orbit, the short-axis direction that out-of-plane vibration direction is elliptical orbit.The no matter internal vibration of suspension cable generating plane or out-of-plane vibration, all can affect Security and the durability of cable stayed bridge, want to control suspension cable and all do not vibrate under the various excitations in the external world, need to in the face of suspension cable and out-of-plane vibration all should make control.
Summary of the invention
For the defect existing in prior art, the object of the present invention is to provide a kind of suspension cable permanent-magnet type eddy current damper and damping generation method, can control in the face of suspension cable and out-of-plane vibration simultaneously.
For reaching above object, the technological scheme that the present invention takes is: a kind of suspension cable permanent-magnet type eddy current damper, comprise base plate, bearing, connecting rod and lever, described bearing is fixedly installed on the top of described base plate, described lever is all flexibly connected with described connecting rod, bearing, also comprises damping generating device, and described damping generating device comprises the outer driving gear of face and the outer driven gear of face, described outer driving gear is fixedly installed on the bottom of connecting rod, and engages with described outer driven gear; The central authorities of the outer driven gear of face are fixedly plugged with damping shaft, sheathed one group or the two groups device of making cutting magnetic line movement also on described damping shaft; The described device of making cutting magnetic line movement comprises driven gear and face inner pinion gear in face outer conductor dish, fixed tray, face inner wire dish, face, and described damping shaft outwards passes driven gear in described outer conductor dish, fixed tray and face successively by the outer driven gear of face; Face outer conductor dish is fixed on damping shaft, described fixed tray is fixedly installed on the bottom of connecting rod, and fixed tray is connected with damping shaft by bearing, described inner wire dish is fixed on described interior driven gear, and face inner wire dish is in fixed tray and face between driven gear; Each card of fixed tray is all fixedly installed at least one permanent magnet, between described permanent magnet and face outer conductor dish, face inner wire dish, is equipped with gap; Described inner pinion gear is fixed on the upper surface of base plate, and engages with driven gear in face.
On the basis of technique scheme, when being only provided with one group of device of making cutting magnetic line movement on described damping shaft, the device of described cutting magnetic line movement is positioned at any side of the outer driven gear of face, when described damping shaft is provided with two groups of devices of making cutting magnetic line movement, described in two groups, do the device symmetrical both sides that are positioned at the outer driven gear of face respectively of cutting magnetic line movement.
On the basis of technique scheme, the permanent magnet in two cards of described fixed tray, towards face outer conductor dish, the edge setting of vicinal face outer conductor dish; Towards face inner wire dish, the edge setting of vicinal face inner wire dish.
On the basis of technique scheme, the gap between described permanent magnet and face outer conductor dish, face inner wire dish is 0.5mm to 1mm.
On the basis of technique scheme, each card hoop of described fixed tray is equipped with multiple grooves, and each described groove is embedded in a permanent magnet, and the surface of described permanent magnet is concordant with the surface of fixed tray, and the magnetic pole of adjacent two permanent magnets is contrary.
On the basis of technique scheme, the radius of described outer driving gear is greater than the radius of the outer driven gear of face, and the radius of described inner pinion gear is greater than the radius of driven gear in face.
On the basis of technique scheme, also comprise cord clip, described cord clip is positioned at the top of described connecting rod.
On the basis of technique scheme, the material of described outer conductor dish and face inner wire dish is aluminium.
A kind of damping generation method of suspension cable permanent-magnet type eddy current damper is as follows:
Described connecting rod is connected in to suspension cable, and described base plate is fixed on to bridge floor;
When suspension cable generation out-of-plane vibration, connecting rod drives the outer driving gear of face and the outer driven gear of face that engagement occurs and rotates, and the outer driven gear of face drives face outer conductor dish to make cutting magnetic line movement, thereby produces the vibrational energy of eddy-current damping with dissipation suspension cable;
When the internal vibration of suspension cable generating plane, connecting rod drives driven gear in face inner pinion gear and face that engagement rotation occurs, and in face, driven gear drives face inner wire dish to make cutting magnetic line movement, thereby produces the vibrational energy of eddy-current damping with dissipation suspension cable;
When out-of-plane vibration and in plane vibration occur suspension cable simultaneously, face outer conductor dish and face inner wire dish are made cutting magnetic line movement simultaneously, thereby produce the vibrational energy of eddy-current damping with dissipation suspension cable.
On the basis of technique scheme, the top of described connecting rod is provided with cord clip, by described cord clip, connecting rod is vertically connected to suspension cable.
Beneficial effect of the present invention is: the present invention utilizes face outer conductor dish and face inner wire dish in permanent magnet field, to make cutting magnetic line movement and produces eddy-current damping, with the vibrational energy of dissipation suspension cable, realized control effectively with out-of-plane vibration in the face of suspension cable simultaneously, and this damping constant is stable, can adapt to the variation of various temperature.
Accompanying drawing explanation
Fig. 1 is the structural drawing of a kind of suspension cable permanent-magnet type eddy current of the present invention damper;
Fig. 2 is the structural drawing of damping generating device in Fig. 1;
Fig. 3 is the schematic diagram that in Fig. 2, multiple permanent magnets are positioned at a card of fixed tray;
Fig. 4 is the schematic diagram that suspension cable permanent-magnet type eddy current damper is installed on bridge floor.
Reference character: base plate 1; Bearing 2, bearing axle 21; Connecting rod 3; Lever 4, lever shaft 41; Damping generating device 5, the outer driving gear 51 of face, driven gear 52 in face, the outer driven gear 53 of face, damping shaft 54, face outer conductor dish 55, face inner pinion gear 56, face inner wire dish 57, fixed tray 58, permanent magnet 59; Cord clip 6; Suspension cable 7.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1 and Figure 2, a kind of suspension cable permanent-magnet type eddy current damper comprises base plate 1, bearing 2, connecting rod 3, lever 4, damping generating device 5 and cord clip 6, described bearing 2 is fixedly installed on the top of described base plate 1, described lever 4 is hinged by bearing axle 21 and bearing 2, also hinged by lever shaft 41 and described connecting rod 3, described cord clip 6 is fixed in the top of connecting rod 3.Described damping generating device 5 comprises the outer driving gear 51 of face and the outer driven gear 53 of face, and described outer driving gear 51 is fixedly installed on the bottom of connecting rod 3, and engages with described outer driven gear 53, in the outer driven gear 53 of face, is fixedly plugged with damping shaft 54.Sheathed one or two group of device of making cutting magnetic line movement also on described damping shaft 54, when sheathed one group of device of making cutting magnetic line movement only, the device that this group is made cutting magnetic line movement is positioned at any side of the outer driven gear 53 of face.In the present embodiment, sheathed two groups of devices of making cutting magnetic line movement on described damping shaft 54, do the device symmetrical both sides that are positioned at described outer driven gear 53 respectively of cutting magnetic line movement for two groups.
Every group of device of making cutting magnetic line movement comprises driven gear 52 and face inner pinion gear 56 in face outer conductor dish 55, fixed tray 58, face inner wire dish 57, face, and described damping shaft 54 outwards passes driven gear 52 in described outer conductor dish 55, fixed tray 58 and face successively by the outer driven gear 53 of face.Described outer conductor dish 55 is fixed on damping shaft 54, and described fixed tray 58 is fixedly installed on the bottom of connecting rod 3, and fixed tray 58 is connected with damping shaft 54 by bearing, and damping shaft 54 can rotate in bearing; Driven gear 52 has cam towards a side of 58 in face, and described inner wire dish 57 fixed covers are located on cam, and face inner wire dish 57 is in fixed tray 58 and face between driven gear 52; Each card of fixed tray 58 all arranges at least one permanent magnet 59, between described permanent magnet 59 and face outer conductor dish 55, face inner wire dish 57, is equipped with gap; Described inner pinion gear 56 is fixed on the upper surface of base plate 1, and engages with driven gear in face 52.
A conductor disc is rotated the damping constant producing and is in the magnetic field of fixed tray one side:
T=C
rω
T-rotary damping moment, ω-rotational angular velocity, C
r-rotary damping coefficient, the perveance of σ-conductor disc, the thickness of d-conductor disc, B-magnetic induction intensity, R
ooverlay area ,-conductor disc magnetic field external diameter, R
ioverlay area ,-conductor disc magnetic field internal diameter.
By formula above, can be found out the difference of 4 powers of magnetic induction density B, conductor disc magnetic field overlay area external diameter and the internal diameter in the perveance σ of damping due to rotation moment T and rotational angular velocity, conductor disc, the thickness d of conductor disc, magnetic field
all be directly proportional.
In the present embodiment, each card of fixed tray 58 is all arranged circumferentially multiple grooves, each groove is embedded in a permanent magnet 59, the surface in permanent magnet 59 outsides is concordant with the surface of fixed tray 58 sides, and in any two adjacent notches, the magnetic pole of permanent magnet 59 is contrary, (as shown in Figure 3), enough large to guarantee face outer conductor dish 55 and face outer conductor dish 57 change rate of magnetic density when rotating; Gap between permanent magnet 59 and face outer conductor dish 55, face inner wire dish 57 is 0.5mm to 1mm, to guarantee the magnetic intensity of permanent magnet 59; Meanwhile, permanent magnet 59 is strong magnet, thereby guarantees the magnetic induction density B in magnetic field.Permanent magnet 59 in 58 two cards of described fixed tray, towards face outer conductor dish 55, the edge setting of vicinal face outer conductor dish 55; Towards face inner wire dish 57, the edge setting of vicinal face inner wire dish 57, to increase the difference of 4 powers of face outer conductor dish 55 and face inner wire dish 57 each self-magnetic field overlay area external diameters and internal diameter
the radius of the outer driving gear 51 of face is greater than the radius of the outer driven gear 53 of face, and the radius of face inner pinion gear 56 is greater than the radius of driven gear 52 in face, thereby increases the rotational angular velocity of face outer conductor dish 55 and face inner wire dish 57.Consider economic factor and perveance, the material of face outer conductor dish 55 and face inner wire dish 57 is aluminium.
The concrete grammar of suspension cable permanent-magnet type eddy current damper generation damping of the present invention is as follows:
The top of described connecting rod is provided with cord clip 6, by cord clip 6, described connecting rod 3 is vertically connected to suspension cable 7, and described base plate 1 is fixed on to bridge floor (as shown in Figure 4).
When there is out-of-plane vibration in suspension cable 7, there is engagement and rotate in the outer driven gear 53 of the connecting rod outer driving gear 51 of 3 drive face and face, the outer driven gear 53 of face drives damping shaft 54 to rotate, be fixed on the face outer conductor dish 55 of damping shaft 54 also along with damping shaft 54 rotates together, one side of the fixed tray 58 adjacent with face outer conductor dish 55 has magnetic field, make face outer conductor dish 55 make cutting magnetic line movement in this magnetic field, thereby produce the vibrational energy of eddy-current damping with dissipation suspension cable 7.
When suspension cable 7 generating plane internal vibration, connecting rod 3 drives driven gear 52 in face inner pinion gear 56 and face that engagement rotation occurs, fixed cover is located at the face inner wire dish 57 of driven gear 52 in face also along with driven gear in face 52 rotates together, one side of the fixed tray 58 adjacent with face inner wire dish 57 has magnetic field, make face inner wire dish 57 make cutting magnetic line movement in this magnetic field, thereby produce the vibrational energy of eddy-current damping with dissipation suspension cable 7.
When out-of-plane vibration and in plane vibration occur suspension cable 7 simultaneously, face outer conductor dish 55 and face inner wire dish 57, respectively in the both sides of fixed tray 58, are made cutting magnetic line movement simultaneously, thereby produce the vibrational energy of eddy-current damping with dissipation suspension cable 7.
The present invention is not limited to above-mentioned mode of execution, for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, within these improvements and modifications are also considered as protection scope of the present invention.The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. a suspension cable permanent-magnet type eddy current damper, comprise base plate (1), bearing (2), connecting rod (3) and lever (4), described bearing (2) is fixedly installed on the top of described base plate (1), described lever (4) and described connecting rod (3), bearing (2) is all flexibly connected, it is characterized in that: also comprise damping generating device (5), described damping generating device (5) comprises the outer driving gear (51) of face and the outer driven gear (53) of face, described outer driving gear (51) is fixedly installed on the bottom of connecting rod (3), and engage with described outer driven gear (53), the central authorities of the outer driven gear (53) of face are fixedly plugged with damping shaft (54), and described damping shaft (54) is sheathed one group or the two groups device of making cutting magnetic line movement also, the described device of making cutting magnetic line movement comprises driven gear (52) and face inner pinion gear (56) in face outer conductor dish (55), fixed tray (58), face inner wire dish (57), face, and described damping shaft (54) outwards passes driven gear (52) in described outer conductor dish (55), fixed tray (58) and face successively by the outer driven gear (53) of face, face outer conductor dish (55) is fixed on damping shaft (54), described fixed tray (58) is fixedly installed on the bottom of connecting rod (3), and fixed tray (58) is connected with damping shaft (54) by bearing, described inner wire dish (57) is fixed on described interior driven gear (52), and face inner wire dish (57) is positioned between fixed tray (58) and face driven gear (52), each card of fixed tray (58) is all fixedly installed at least one permanent magnet (59), between described permanent magnet (59) and face outer conductor dish (55), face inner wire dish (57), is equipped with gap, described inner pinion gear (56) is fixed on the upper surface of base plate (1), and engages with driven gear in face (52).
2. suspension cable permanent-magnet type eddy current damper as claimed in claim 1, it is characterized in that: when being only provided with one group of device of making cutting magnetic line movement on described damping shaft (54), the device of described cutting magnetic line movement is positioned at any side of the outer driven gear (53) of face, when described damping shaft (54) is provided with two groups of devices of making cutting magnetic line movement, the device of making cutting magnetic line movement described in two groups respectively symmetry is positioned at the both sides of the outer driven gear (53) of face.
3. suspension cable permanent-magnet type eddy current damper as claimed in claim 2, is characterized in that: the permanent magnet (59) in (58) two cards of described fixed tray, towards face outer conductor dish (55), the edge setting of vicinal face outer conductor dish (55); Towards face inner wire dish (57), the edge setting of vicinal face inner wire dish (57).
4. suspension cable permanent-magnet type eddy current damper as claimed in claim 2, is characterized in that: the gap between described permanent magnet (59) and face outer conductor dish (55), face inner wire dish (57) is 0.5mm to 1mm.
5. the arbitrary suspension cable permanent-magnet type eddy current damper as described in claim 2 to 4, it is characterized in that: each card hoop of described fixed tray (58) is equipped with multiple grooves, each described groove is embedded in a permanent magnet (59), the surface of described permanent magnet (59) is concordant with the surface of fixed tray (58), and the magnetic pole of adjacent two permanent magnets (59) is contrary.
6. suspension cable permanent-magnet type eddy current damper as claimed in claim 2, it is characterized in that: the radius of described outer driving gear (51) is greater than the radius of the outer driven gear (53) of face, the radius of described inner pinion gear (56) is greater than the radius of driven gear (52) in face.
7. suspension cable permanent-magnet type eddy current damper as claimed in claim 2, is characterized in that: also comprise cord clip (6), described cord clip (6) is positioned at the top of described connecting rod (3).
8. suspension cable permanent-magnet type eddy current damper as claimed in claim 2, is characterized in that: described outer conductor dish (55) is aluminium with the material of face inner wire dish (57).
9. the damping generation method based on suspension cable permanent-magnet type eddy current damper claimed in claim 1, is characterized in that:
Described connecting rod (3) is connected in to suspension cable (7), and described base plate (1) is fixed on to bridge floor;
When there is out-of-plane vibration in suspension cable (7), there is engagement and rotate in the outer driven gear (53) of the outer driving gear of connecting rod (3) drive face (51) and face, the outer driven gear (53) of face drives face outer conductor dish (55) to make cutting magnetic line movement, thereby produces the vibrational energy of eddy-current damping with dissipation suspension cable (7);
When suspension cable (7) generating plane internal vibration, connecting rod (3) drives driven gear (52) in face inner pinion gear (56) and face that engagement rotation occurs, in face, driven gear (52) drives face inner wire dish (57) to make cutting magnetic line movement, thereby produces the vibrational energy of eddy-current damping with dissipation suspension cable (7);
When out-of-plane vibration and in plane vibration occur suspension cable (7) simultaneously, face outer conductor dish (55) and face inner wire dish (57) are made cutting magnetic line movement simultaneously, thereby produce the vibrational energy of eddy-current damping with dissipation suspension cable (7).
10. the method for the generation damping based on suspension cable permanent-magnet type eddy current damper claimed in claim 9, it is characterized in that: the top of described connecting rod (3) is provided with cord clip (6), by described cord clip (6), connecting rod (3) is vertically connected to suspension cable (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410004795.3A CN103742585B (en) | 2014-01-07 | 2014-01-07 | A kind of suspension cable permanent-magnet type eddy current damper and damping generation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410004795.3A CN103742585B (en) | 2014-01-07 | 2014-01-07 | A kind of suspension cable permanent-magnet type eddy current damper and damping generation method |
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| CN103742585A true CN103742585A (en) | 2014-04-23 |
| CN103742585B CN103742585B (en) | 2015-09-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104894970A (en) * | 2015-05-21 | 2015-09-09 | 中国铁路总公司 | Eddy current damper for stay cable out-of-surface vibration control and damping generation method |
| CN107574754A (en) * | 2017-10-11 | 2018-01-12 | 中铁第四勘察设计院集团有限公司 | A kind of pendulum-type lever mass damper for controlling suspension cable space oscillations |
| WO2019029197A1 (en) * | 2017-08-11 | 2019-02-14 | 东南大学 | Eddy-current friction-pendulum seismic reduction and isolation support |
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| JPH01307543A (en) * | 1988-06-02 | 1989-12-12 | Kayaba Ind Co Ltd | Rotary magnetic damper |
| JPH05296287A (en) * | 1992-04-22 | 1993-11-09 | Fuji Elelctrochem Co Ltd | Magnetic damper |
| JPH0971903A (en) * | 1995-09-07 | 1997-03-18 | Kajima Corp | Damper of diagonal cable in cable stayed bridge |
| JP2001329508A (en) * | 2000-05-23 | 2001-11-30 | Kajima Corp | Mechanism for taking measure to sag change for diagonal cable damping device |
| CN101761146A (en) * | 2010-01-04 | 2010-06-30 | 湖南大学 | Permanent-magnet type eddy current tuned mass damper |
| CN201778278U (en) * | 2010-03-29 | 2011-03-30 | 中铁二院工程集团有限责任公司 | Vortex-induced vibration suppression device of steel truss girder cable stayed bridge |
| KR101137474B1 (en) * | 2009-12-24 | 2012-04-20 | 재단법인 포항산업과학연구원 | Magnetorheological cable and mechanism using the same |
| EP2562440A2 (en) * | 2011-08-24 | 2013-02-27 | Dresser-Rand Company | Magnetically-coupled damper for turbomachinery |
-
2014
- 2014-01-07 CN CN201410004795.3A patent/CN103742585B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01307543A (en) * | 1988-06-02 | 1989-12-12 | Kayaba Ind Co Ltd | Rotary magnetic damper |
| JPH05296287A (en) * | 1992-04-22 | 1993-11-09 | Fuji Elelctrochem Co Ltd | Magnetic damper |
| JPH0971903A (en) * | 1995-09-07 | 1997-03-18 | Kajima Corp | Damper of diagonal cable in cable stayed bridge |
| JP2001329508A (en) * | 2000-05-23 | 2001-11-30 | Kajima Corp | Mechanism for taking measure to sag change for diagonal cable damping device |
| KR101137474B1 (en) * | 2009-12-24 | 2012-04-20 | 재단법인 포항산업과학연구원 | Magnetorheological cable and mechanism using the same |
| CN101761146A (en) * | 2010-01-04 | 2010-06-30 | 湖南大学 | Permanent-magnet type eddy current tuned mass damper |
| CN201778278U (en) * | 2010-03-29 | 2011-03-30 | 中铁二院工程集团有限责任公司 | Vortex-induced vibration suppression device of steel truss girder cable stayed bridge |
| EP2562440A2 (en) * | 2011-08-24 | 2013-02-27 | Dresser-Rand Company | Magnetically-coupled damper for turbomachinery |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104894970A (en) * | 2015-05-21 | 2015-09-09 | 中国铁路总公司 | Eddy current damper for stay cable out-of-surface vibration control and damping generation method |
| WO2019029197A1 (en) * | 2017-08-11 | 2019-02-14 | 东南大学 | Eddy-current friction-pendulum seismic reduction and isolation support |
| CN107574754A (en) * | 2017-10-11 | 2018-01-12 | 中铁第四勘察设计院集团有限公司 | A kind of pendulum-type lever mass damper for controlling suspension cable space oscillations |
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| Publication number | Publication date |
|---|---|
| CN103742585B (en) | 2015-09-30 |
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Address after: 103 No. 430000 Hubei Province in Qiaokou District of Wuhan city road construction Patentee after: BRIDGE SCIENCE AND TECHNOLOGY INSTITUTE CO., LTD., CHINA RAILWAY ENGINEERING GROUP Patentee after: Group Co., Ltd., Zhongtie Daqiao Bureau Address before: 430000 No. 103, Jianshe Avenue, Wuhan, Hubei Patentee before: China Zhongtie Major Bridge Engineering Group Co., Ltd. Patentee before: Group Co., Ltd., Zhongtie Daqiao Bureau |
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Effective date of registration: 20200618 Address after: 430000 No.29 Hanxi Road, Qiaokou District, Wuhan City, Hubei Province Co-patentee after: China Zhongtie Major Bridge Engineering Group Co.,Ltd. Patentee after: China Railway Qiaoyan Technology Co., Ltd Co-patentee after: CHINA RAILWAY BRIDGE SCIENCE RESEARCH INSTITUTE, Ltd. Address before: No. 103 430000 Qiaokou District in Hubei province Wuhan city road construction Co-patentee before: China Zhongtie Major Bridge Engineering Group Co.,Ltd. Patentee before: CHINA RAILWAY BRIDGE SCIENCE RESEARCH INSTITUTE, Ltd. |