CN107012798B - A kind of Bridge Erector supporting leg stand under load equalising control device and method - Google Patents
A kind of Bridge Erector supporting leg stand under load equalising control device and method Download PDFInfo
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- CN107012798B CN107012798B CN201710362971.4A CN201710362971A CN107012798B CN 107012798 B CN107012798 B CN 107012798B CN 201710362971 A CN201710362971 A CN 201710362971A CN 107012798 B CN107012798 B CN 107012798B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004873 anchoring Methods 0.000 claims description 37
- 238000006073 displacement reaction Methods 0.000 claims description 28
- 238000010276 construction Methods 0.000 abstract description 5
- 230000004308 accommodation Effects 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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Abstract
The present invention relates to a kind of stand under load equalising control device and methods, belong to Summarized Account of Bridge Erection Construction apparatus field, and in particular to a kind of Bridge Erector supporting leg stand under load equalising control device and method.The present invention by customization different-stiffness left rubber support and right rubber support deflection, come make up cantilever force support bearing crossbeam deformation, coordinate both sides support roller stress, to achieve the purpose that balanced stand under load；Support change gear assembly using multi-stage equalizing beam+more wheels group design can both disperse the big load between girder and supporting leg well, and in turn ensuring can do relative motion between supporting leg and girder, even running；Central shaft and wearing plate are set between hinged-support center and traversing platform, support change gear assembly can be made to be rotated with the yaw of girder, the angle that girder yaw is generated with supporting leg when accommodation curve is set a roof beam in place.
Description
Technical field
The present invention relates to a kind of stand under load equalising control device and methods, belong to Summarized Account of Bridge Erection Construction apparatus field, and in particular to one
Kind Bridge Erector supporting leg stand under load equalising control device and method.
Background technology
In recent years, along with nationwide railway, highway construction tide, in the case where tending to complicated construction background, high-speed iron
Overhead section of road, highway major part are all made of the form of construction work that Bridge Erector sets up large scale prefabricated box beam.This just promotes China's precast box
Roof beam structure fortune equipment develops towards enlarged direction.Large-scale Bridge Erector need to meet 40 meters or more of span, a hole double width box beam
It sets up, sets a roof beam in place in addition to standard can be carried out and make out of trade, also need to meet sweep box beam erection.
Currently, Bridge Erector supporting leg mostly uses the structural rigidities support girder such as idler wheel or hinged shaft.And the carrying centre-to-centre spacing of supporting leg
By having set a roof beam in place piece web centre-to-centre spacing and bridge pier size is influenced, the bearing beam cantilever support girder of supporting leg, the change of supporting leg crossbeam
Shape can lead to side sway and the torsion of girder, the support wheel under unilateral girder occur and empty phenomenon, stand under load distribution is serious uneven.
When traversing girder yaw is with accommodation curve box beam erection, left and right girder can be relative to supporting leg along longitudinal direction one in front and one in back
Sliding.And the anchoring of girder and supporting leg at present mostly uses fixed pin shaft connection, it is most likely that girder occur and anchor bolt with supporting leg
Traversing motionless afterwards or traversing do not insert afterwards anchors axis pin.Additionally, it is also possible to after there is girder and supporting leg anchoring bolt, under supporting leg
Portion's anchor pole misplaces with frame box beam or bridge pier anchor hole, the case where can not anchoring.
Invention content
The present invention is mainly when solving the Bridge Erector supporting leg rigid support girder present in the prior art, two under same girder
Side support roller group unequal force easily occurs in the technical issues of certain operating mode lower support wheel is with girder break-off, provides one kind
Bridge Erector supporting leg stand under load equalising control device and method.The device and method is set in the traverse displacement unit below the support roller of girder both sides
Set different size and the rubber support of rigidity, by deflection different after rubber support stand under load come coordinate both sides support roller by
Power, to achieve the purpose that balanced stand under load.
Further object of the present invention is to solve the anchoring of crane's major girder and supporting leg present in the prior art using fixation
After axis pin connection, traversing motionless or traversing do not insert afterwards anchors axis pin and supporting leg lower part anchor pole and frame case after there is bolt
Beam or the dislocation of bridge pier anchor hole, the technical issues of can not anchoring, provide a kind of Bridge Erector supporting leg stand under load equalising control device and side
Method.The device and method anchors oil cylinder automatic equalization stress by two of intercommunication oil circuit, and anchoring girder prevents it from integrally indulging
To play.Anchoring oil cylinder can also drive a small amount of vertical shift of supporting leg, facilitate the exactitude position of supporting leg and anchor hole.
Above-mentioned technical problem is solved by following scheme：
A kind of Bridge Erector supporting leg stand under load balancer, including：
It asks change gear assembly, support to be hung in girder opposite sides, is used to support girder or hanging supporting leg；
Traverse displacement unit connects the support change gear assembly, for driving girder under the driving of traversing oil cylinder by hinged-support
It is mobile；
Wherein, rubber support, and the rubber support of girder left and right sides are set between support change gear assembly and traverse displacement unit
Rigidity is different.
Optimize, a kind of above-mentioned Bridge Erector supporting leg stand under load balancer, the traverse displacement unit includes：
Traversing bearing is individually fixed on the bearing beam of girder down either side；
Traversing platform, in the traversing bearing being set to, and the traversing oil cylinder sliding described in the driving lower edge of traversing oil cylinder；
Clamping groove plate is provided with rubber support between the traversing platform and traversing bearing in the seam allowance groove of top,
Below traversing wearing plate is provided in seam allowance groove.
Optimization, a kind of above-mentioned Bridge Erector supporting leg stand under load balancer, the traversing bearing is two, is individually fixed in
Girder down either side；Also, there is different-stiffness positioned at the rubber support of both sides above the traversing bearing, according to different loads
Generate specific deflection.
Optimization, above-mentioned a kind of Bridge Erector supporting leg stand under load balancer, between the hinged-support center and traverse displacement unit
Equipped with hinged-support central shaft and hinged-support wearing plate.
Optimization, a kind of above-mentioned Bridge Erector supporting leg stand under load balancer, the clamping groove plate is embedded in the groove of traversing platform
It is interior, and can be slid vertically along groove.The lower part of clamping groove plate and traversing bearing be matched to can be used as the traversing guiding of traverse displacement unit
Inverted U groove.
Optimization, a kind of above-mentioned Bridge Erector supporting leg stand under load balancer, further includes anchor, the anchor tool
Body includes：
Oil cylinder is anchored, both ends are hingedly connected to be fixed on the anchoring oil cylinder undersetting on traverse displacement unit and are fixed on girder
On anchoring oil cylinder upper bracket；
Support adjusting rod, both ends are hingedly connected to above anchoring oil cylinder and traverse displacement unit.
Optimization, a kind of above-mentioned Bridge Erector supporting leg stand under load balancer, the anchor for fixing different girders
Intercommunication oil circuit between anchoring oil cylinder.
A kind of Bridge Erector supporting leg stand under load balance control method, including：
By being hung on the hinged traverse displacement unit of the support change gear assembly for being used to support girder or hanging supporting leg on girder with support
Movement drive the girder to move；
By the way that the different rubber support being located between support change gear assembly and traverse displacement unit of rigidity is arranged in girder left and right sides
To coordinate both sides support roller stress.
Therefore, the invention has the advantages that：
(1) use the support change gear assembly of multi-stage equalizing beam+more wheels group design that can both disperse between girder and supporting leg well
Big load, in turn ensuring can do relative motion between supporting leg and girder, even running.
(2) central shaft and wearing plate are set between hinged-support center and traversing platform, support change gear assembly can be made with master
The yaw of beam and rotate, the angle that girder yaw and supporting leg generate when accommodation curve is set a roof beam in place.
(3) by the deflection of the left rubber support and right rubber support of the different-stiffness of customization, to make up cantilever force
Support bearing crossbeam deformation, coordinate both sides support roller stress, to achieve the purpose that balanced stand under load.
(4) it can one in front and one in back be slided along longitudinal direction relative to supporting leg when left and right girder yaw, the anchorage bearing of girder and supporting leg
Between distance can also change.Two of anchor intercommunication oil circuit anchoring oil cylinders can automatic equalization stress, with anchoring branch
Seat elongates or shortens together, ensures the rotation of girder energy confronting legs, and cannot generally longitudinally play.
(5) anchor can drive supporting leg to carry out a small amount of vertical shift, convenient to make up the anchor hole foozle of box beam and bridge pier
The anchor pole of supporting leg lower part and its exactitude position, smoothly anchor.
Description of the drawings
Fig. 1 is the front view of the present invention.
Fig. 2 is the A direction views of Fig. 1.
Fig. 3 is the B-B sectional views of Fig. 2.
Fig. 4 is the C-C sectional views of Fig. 2.
Fig. 5 is the D-D sectional views of Fig. 1.
In figure：
1- girders；2- holds in the palm change gear assembly；3- hinged-supports；4- left-hand thread components；5- traverse displacement units；6- bearing beams；7- is traversing
Oil cylinder；8- anchors；9- hinged-support wearing plates；The traversing platforms of 10-；11- hinged-support central shafts；The left rubber supports of 12-；13-
Clamping groove plate；The traversing wearing plates of 14-；15- traversing bearings；16- sealing plates；17- hinged-support axis pins；18- anchors oil cylinder undersetting；19-
Anchor oil cylinder；20- anchors oil cylinder upper bracket；21- anchors bolt axle；The right rubber supports of 22-；The traversing bolt axles of 23-；24- is supported
Adjusting rod.
Specific implementation mode
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment：
Referring to Fig. 1, Bridge Erector supporting leg stand under load equilibrium of the invention and girder and supporting leg anchor include support change gear assembly
2, hinged-support 3, left-hand thread component 4, traverse displacement unit 5, traversing oil cylinder 7, anchor 8 etc..
Referring to Fig. 2, Fig. 3 and Fig. 4, traverse displacement unit 5 is mainly by traversing platform 10, hinged-support central shaft 11, left rubber support
12, right rubber support 22, clamping groove plate 13, traversing wearing plate 14, traversing bearing 15, sealing plate 16 form.
In order to ensure can to do relative motion between the Bridge Erector supporting leg and girder 1, supporting leg is using support change gear assembly 2
Girder 1 is supportted, and makees to be pressed on support roller when rolling connection, i.e. 1 vertical shift of girder, when supporting leg vertical shift is hung on change gear.In order to ensure to transport
Capable steady and reasonable stress, support change gear assembly 2 is using multi-stage equalizing beam+more wheels group design.
Ask change gear assembly 2 hinged by hinged-support axis pin 17 and hinged-support 3.3 center of hinged-support is equipped with hinged-support center
Axis 11, and be connected with traversing platform 10, to realize that hinged-support 3 can be rotated relative to traverse displacement unit 5.Hinged-support 3 and traversing platform
Hinged-support wearing plate 9 is equipped between 10, to reduce frictional resistance when relatively rotating.
Be equipped with successively from top to bottom between traversing platform 10 and bearing beam 6 left rubber support 12 or right rubber support 22,
Clamping groove plate 13, traversing wearing plate 14, traversing bearing 15.10 lower part of traversing platform is equipped with the groove of 4 different depths, for installing
The left rubber support 12 and right rubber support 22 of different size.Traversing bearing 15 is welded with bearing beam 6.Above and below clamping groove plate 13
Processing surrounding has the groove of seam allowance, respectively installing left rubber support 12 or right rubber support 22, traversing wearing plate 14.
The lower part of clamping groove plate 13 is also machined with and 15 matched inverted U groove of traversing bearing so that traverse displacement unit 5 can be along traversing bearing
15 slide laterally, and limit the longitudinal movement of traverse displacement unit 5.Sealing plate 16 is installed on 10 bottom of traversing platform by bolt, to hold
Hold in the palm left rubber support 12 or right rubber support 22 and clamping groove plate 13.
7 one end of traversing oil cylinder is bolted on bearing beam 6, and the other end is articulated on traversing platform 10, is passed through
Oil cylinder is flexible, traverse displacement unit 5 and support change gear assembly 2 is pushed, so that 1 yaw of girder, the erection of accommodation curve beam.Adjustment knot
During traversing oil cylinder 7 returns, traverse displacement unit 5 and bearing beam 6 are anchored by traversing bolt axle 23 by Shu Hou.
Left-hand thread component 4 is connect by bolt with the both sides of traversing platform 10, and blocks the upper flange of bearing beam 6, works as branch
When the traversing contraposition of leg substructure, traversing guiding role is played.When supporting leg leaves ground, supporting leg passes through left-hand thread from heavy load
Component 4 and hinged-support central shaft 11 are transmitted on support change gear assembly 2, realize supporting leg from the vertical shift on 1 lower part ear beam of girder.
Referring to Fig. 1, Fig. 3 and Fig. 5, girder 1 lower section medium position in left and right is equipped with anchor 8, respectively anchoring left and right master
Beam 1, to ensure the traversing stability longitudinal with girder when setting a roof beam in place 1.
Anchor 8 is mainly by anchoring oil cylinder undersetting 18, anchoring oil cylinder 19, anchoring oil cylinder upper bracket 20, anchoring bolt
Axis 21, support adjusting rod 24 form.It anchors oil cylinder undersetting 18 to weld with traversing platform 10, anchoring oil cylinder upper bracket 20 and girder
1 is bolted.It is hinged with anchoring oil cylinder undersetting 18 and anchoring oil cylinder upper bracket 20 respectively to anchor oil cylinder 19, wherein anchoring oil
19 top of cylinder can be realized simple and rapid fixed and be connect with anchoring oil cylinder upper bracket 20 by anchoring bolt axle 21.Anchor oil cylinder
Upper bracket 20 is provided with several holes position, the variation that supporting leg occurs with 1 relative position of girder when adapting to different operating modes.Support is adjusted
Bar 24 is supported in anchoring 19 medium position of oil cylinder, and adjustable anchoring oil cylinder 19 rotates upwardly and downwardly, and facilitates contraposition bolt.After the completion of anchoring
Intercommunication oil circuit is so that two anchoring 19 automatic equalization stress of oil cylinder.
With the above structure, bridge formation is solved well using the support change gear assembly of multi-stage equalizing beam+more wheels group design
The support problem of rack beam, girder and supporting leg vertical shift via, not only ensure that can do relative motion between supporting leg and girder, but also make
Obtain its even running and reasonable mechanical.
Ask the wheel rim of change gear assembly can be respectively as the guiding of supporting leg vertical shift and girder vertical shift.When girder needs yaw,
It is also that wheel rim pushes girder realization traversing.Girder is traversing, will necessarily generate angle with support change gear assembly.Because using multi-stage equalizing
The design of beam+more wheels group, support, change gear be distributed along girder longitudinal direction it is longer, by the gap of wheel rim and track come make up girder with
The angle that support change gear assembly generates has been less likely.The central shaft and hinged-support being arranged between hinged-support center and traversing platform subtract
Nog plate can solve this problem.Support change gear assembly can be rotated with the yaw of girder, be not in because holding in the palm gear changing group
Part wheel rim blocks girder and traversing motionless situation.
Because of support bearing crossbeam cantilever support girder, it after girder stand under load, certainly will twist and side sway, same master occur
Support roller stress is big in the inner part under beam, in the outer part the small phenomenon of support roller stress.A left side for the different-stiffness customized in traversing land groove
Different vertical deformations occurs after rubber support and right rubber support stand under load, left rubber support stress small deformation is also small, right rubber
Bearing Seat Force large deformation is also big, and the deformation of the support bearing crossbeam of cantilever force is made up by its different deflection, coordinates
The stress of both sides support roller, to achieve the purpose that balanced stand under load.
Clamping groove plate top surrounding has the groove of seam allowance to install left rubber support and right rubber support, meanwhile, clamping groove plate
It is embedded in the groove of traversing platform again so that left rubber support and right rubber support after stand under load freely can vertically become
Shape, without transverse shift occurs.The inverted U groove of clamping groove plate lower part can slide laterally along the traversing bearing on bearing beam,
Traversing guiding as traverse displacement unit.
When Bridge Erector curve is set a roof beam in place, traversing oil cylinder drives traverse displacement unit, realizes girder yaw.Due to center to center distance between main girder compared with
Greatly, when yaw, left and right girder can one in front and one in back slide along longitudinal direction relative to supporting leg, on anchoring oil cylinder undersetting and anchoring oil cylinder
Distance between bearing can also have greatly changed.And two anchoring oil cylinder automatic equalization stress of intercommunication oil circuit, it can be with one
It rises and elongates or shortens, playing the role of anchoring girder prevents it from generally longitudinally play.
To ensure Bridge Erector job safety, when setting a roof beam in place with via operation, supporting leg lower part must pass through anchor pole and frame box beam
Or the anchoring of the anchor hole of bridge pier.To make up the foozle of box beam and bridge pier, anchor can drive a small amount of vertical shift of supporting leg, convenient
The exactitude position of supporting leg and anchor hole.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Although 1- girders are used more herein；2- holds in the palm change gear assembly；3- hinged-supports；4- left-hand thread components；The traversing dresses of 5-
It sets；6- bearing beams；The traversing oil cylinders of 7-；8- anchors；9- hinged-support wearing plates；The traversing platforms of 10-；11- hinged-supports center
Axis；The left rubber supports of 12-；13- clamping groove plates；The traversing wearing plates of 14-；15- traversing bearings；16- sealing plates；17- hinged-support axis pins；
18- anchors oil cylinder undersetting；19- anchors oil cylinder；20- anchors oil cylinder upper bracket；21- anchors bolt axle；The right rubber supports of 22-；
The traversing bolt axles of 23-；The terms such as 24- support adjusting rods, but it does not preclude the possibility of using other terms.Use these terms
It is only for the convenience of describing and explaining the nature of the invention；Be construed as any one of the additional limitations all and be with
What spirit of that invention was disagreed.
Claims (8)
1. a kind of Bridge Erector supporting leg stand under load balancer, which is characterized in that including：
It asks change gear assembly (2), support to be hung in girder (1) opposite sides, is used to support girder (1) or hanging supporting leg；
Traverse displacement unit (5) connects the support change gear assembly (2), under the driving of traversing oil cylinder (7) by hinged-support (3)
Drive girder (1) mobile；
Wherein, rubber support, and the rubber of girder (1) left and right sides are set between support change gear assembly (2) and traverse displacement unit (5)
Support stiffness is different.
2. a kind of Bridge Erector supporting leg stand under load balancer according to claim 1, which is characterized in that the traverse displacement unit
(5) include：
Traversing bearing (15) is individually fixed on the bearing beam (6) of girder (1) down either side；
Traversing platform (10), in the traversing bearing being set to (15), and the traversing oil described in the driving lower edge of traversing oil cylinder (7)
Cylinder (7) slides；
Clamping groove plate (13) is provided between the traversing platform (10) and traversing bearing (15) in the seam allowance groove of top
Rubber support is provided with traversing wearing plate (14) below in seam allowance groove.
3. a kind of Bridge Erector supporting leg stand under load balancer according to claim 1, which is characterized in that the traversing bearing
(15) it is two, is individually fixed in girder (1) down either side；Also, positioned at the rubber of both sides above the traversing bearing (15)
Bearing has different-stiffness, and specific deflection is generated according to different loads.
4. a kind of Bridge Erector supporting leg stand under load balancer according to claim 1, which is characterized in that in hinged-support (3)
Hinged-support central shaft (11) and hinged-support wearing plate (9) are equipped between the heart and traverse displacement unit (5).
5. a kind of Bridge Erector supporting leg stand under load balancer according to claim 1, which is characterized in that clamping groove plate (13) is embedded in
In the groove of traversing platform (10), and it can be slid vertically along groove；The lower part of clamping groove plate (13) is matched with traversing bearing (15)
The inverted U groove that can be used as traverse displacement unit (5) traversing guiding.
6. a kind of Bridge Erector supporting leg stand under load balancer according to claim 1, which is characterized in that further include anchor
(8), the anchor (8) specifically includes：
Oil cylinder (19) is anchored, both ends are hingedly connected to the anchoring oil cylinder undersetting (18) being fixed on traverse displacement unit (5) and consolidate
The anchoring oil cylinder upper bracket (20) being scheduled on girder (1)；
Support adjusting rod (24), both ends are hingedly connected to above anchoring oil cylinder (19) and traverse displacement unit (5).
7. a kind of Bridge Erector supporting leg stand under load balancer according to claim 6, which is characterized in that for fixing different masters
Intercommunication oil circuit between the anchoring oil cylinder (19) of the anchor (8) of beam (1).
8. a kind of Bridge Erector supporting leg stand under load balance control method, which is characterized in that including：
Pass through hinged traversing of support change gear assembly (2) for being used to support girder (1) or hanging supporting leg being hung on support on girder (1)
The movement of device (5) drives the girder (1) mobile；
By the way that the different rubber being located between support change gear assembly (2) and traverse displacement unit (5) of rigidity is arranged in girder (1) left and right sides
Bearing coordinates both sides support roller stress.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710362971.4A CN107012798B (en) | 2017-05-22 | 2017-05-22 | A kind of Bridge Erector supporting leg stand under load equalising control device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710362971.4A CN107012798B (en) | 2017-05-22 | 2017-05-22 | A kind of Bridge Erector supporting leg stand under load equalising control device and method |
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| CN107012798B true CN107012798B (en) | 2018-09-18 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111074792A (en) * | 2020-01-03 | 2020-04-28 | 北京中铁建北方路桥工程有限公司 | Large-span bridge fabrication machine and sliding device thereof |
| CN112227220B (en) * | 2020-11-06 | 2022-03-25 | 浙江中建路桥设备有限公司 | Large-span high-stability bridge girder erection machine |
| CN112227221B (en) * | 2020-11-06 | 2024-05-10 | 浙江中建路桥设备有限公司 | A rear outrigger device for a bridge erecting machine |
| CN116374816A (en) * | 2022-12-28 | 2023-07-04 | 中铁工程机械研究设计院有限公司 | Crown block fulcrum stress balancing device and crane |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1234501A1 (en) * | 1984-09-21 | 1986-05-30 | Vladimirskij Sergej R | Arrangement for sliding-on a bridge span structure |
| CN202099749U (en) * | 2011-06-13 | 2012-01-04 | 温州合力建设机械有限公司 | Bridge erecting machine with right-left adjusting device |
| CN203452011U (en) * | 2013-08-30 | 2014-02-26 | 中铁科工集团有限公司 | Functionally detachable supporting leg structure for bridge girder erection machine |
| CN204715212U (en) * | 2015-03-31 | 2015-10-21 | 中交二航局第四工程有限公司 | A kind of guiding device for mobile formwork girder whole lateral moving |
| CN106400697B (en) * | 2016-12-01 | 2018-04-24 | 中铁工程机械研究设计院有限公司 | A kind of rotary type rack vertical shift driving device for Bridge Erector |
| CN207047715U (en) * | 2017-05-22 | 2018-02-27 | 中铁工程机械研究设计院有限公司 | A kind of Bridge Erector supporting leg stand under load equalising control device |
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