CN101200880A - Steel tube arch single pivot ten-thousand-tonnage horizontal rotation swivel construction method - Google Patents
Steel tube arch single pivot ten-thousand-tonnage horizontal rotation swivel construction method Download PDFInfo
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- CN101200880A CN101200880A CNA2007101689878A CN200710168987A CN101200880A CN 101200880 A CN101200880 A CN 101200880A CN A2007101689878 A CNA2007101689878 A CN A2007101689878A CN 200710168987 A CN200710168987 A CN 200710168987A CN 101200880 A CN101200880 A CN 101200880A
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Abstract
The present invention relates to a single-hinge 10000-ton horizontal swivel construction method of a steel pipe arch bridge. The steel pipe arch is separated into two parts which are respectively assembled and welded to form a half-span arch on the assembling supports of both banks, one end of the half arch of the steel pipe arch is fixed on a horizontal hinged support, a balance measure is applied to separate steel pipes from the supports, bearings form a swivel on the horizontal hinged support, and finally the swivel is driven to horizontally rotate in order to realize the closure of the steel pipe arches of both banks. The present invention relates to a single-hinge 10000-ton horizontal swivel construction method of the long-span steel pipe arch bridges of roads and railways, and the weight of the related single swivel is over 10000 ton. The present invention is particularly applied to occasions in which a canyon needs to be spanned or the clearance under a bridge is not occupied, and has the advantages of safety, reliability, less construction equipment, parallel operation of working procedures, quick closure, etc. The present invention can be applied to the swivel construction of bridge structures, such as a T-shaped rigid framework, a cable stayed bridge, etc.
Description
Technical field
The present invention relates to a kind of highway, Long Span Railway steel pipe arch bridge single pivot ten-thousand-tonnage horizontal rotation swivel construction method.
Background technology
Steel pipe arch bridge is widely used in China, and its superstructure construction method has multiple: support method, knotted rope pylon cantilever method, cable crane assembly unit method, stiffness bow member method, vertical transfer method, the method or the like of flatting turn.Above job practices respectively has characteristics, and is wherein more advanced with the method for turning.The method of turning construction is steel tube arch rib to be divided into two and half stride, assembly unit is welded into and partly strides donor on the assembling support of two sides respectively, use jack and counterweight etc. to make then partly to stride the shaping steel tube arch to come to nothing, utilize rotation system self balance, two sides respectively have one of one's own and turn, at the uniform velocity continuously two sides are partly striden steel tube arch direction in accordance with regulations synchronously, horizontally rotate corresponding angle respectively, be adapted at building between dangerously steep precipitous valley or on the busy trunk railway to its design attitude.
Summary of the invention
It is fast that the present invention aims to provide a kind of safe and reliable, equipment less investment, closure precision height, speed of application, do not take under-clearance, the steel tube arch single pivot ten-thousand-tonnage horizontal rotation swivel job practices that work high above the ground is few.
The implementation of the object of the invention is, the steel tube arch single pivot ten-thousand-tonnage horizontal rotation swivel job practices, and its construction sequence is:
1) steel tube arch is divided into two and half and strides, assembly unit is welded into and partly strides donor on the assembling support of two sides respectively;
2) use the stretch-draw jack, by designing stressing sequence by classification, alternately, dish longitudinal prestressing steel wire bundle in the symmetry stretch-draw, dorsal funciculus, knotted rope, and the dish end face is arranged balance weight on the pier rear side of boundary, move to the opposite side of steel tube arch until the center of gravity of turning, depart from the trace in ball pivot center apart from e, make and partly stride shaping steel tube arch and take off frame, removing top rotary table dish tail supports firmly, rotate system own wt balance this moment, it is supported on the slideway of lower wall basis with steel ball hinge and its latter two insurance steel leg, all the other each points all come to nothing and become to turn state, and two sides respectively have one of one's own and turn;
3) turn respectively with 2 cover levels, synchronous, continuous hydraulic haulage stretch-draw jack in two sides, twine the steel wire bundle that also is embedded in advance on the turntable circumference by traction, form the pure couple that horizontally rotates of rotation system, at the uniform velocity continuously two sides are partly striden steel tube arch direction in accordance with regulations synchronously, horizontally rotate corresponding angle respectively to design attitude;
4) two halves stride the arch turn put in place after, measure the linear and position deviation of donor, have deviation then in the top rotary table rear end and both sides arrange that corresponding large-tonnage jack carries out lateral inclination, the horizontal off normal of axis and vertical deviation fine setting, the arch axial linetype adjustment back that meets design requirement be about to be gone up dish and vertically, laterally, is vertically locked fixedly, implements the span centre closure;
5) the interim latch-up structure of arch rib closure section is installed, arch rib is locked temporarily, closure section arch rib unit piece is installed, carry out welding of span centre donor and the welding of arch springing donor embedding benefit section by designing requirement, concrete between packing perfusion arch springing concrete and the upper lower burrs, alternately remove successively and coil redundance in knotted rope, dorsal funciculus and the dismounting to prestressing tendon and boundary pier pier cap transverse prestress bundle, the backfill abut is until finishing whole work that donor is turned and joined the two sections of a bridge, etc.
Steel tube arch single hinge flat-turning construction method of the present invention is that steel tube arch is divided into two, and assembly unit is welded into and partly strides donor on the assembling support of two sides respectively.End with the steel tube arch semiarch is fixed on the horizontal free bearing afterwards, takes balanced measure to make steel tube arch break away from support, is bearing in to form one on the horizontal free bearing and turn.Drive this afterwards and turn and horizontally rotate, realize the closure of two sides steel tube arch.The single weight of turning involved in the present invention reaches more than ten thousand tons.Ten thousand tons of rotator construction technology of flatting turn of steel tube arch single hinge have overcome the weakness of button anchor cantilever method, the occasion that is specially adapted to cross over deep valley or does not take under-clearance, have safe and reliable, construction equipment is few, each operation parallel operations, advantage such as closure speed is fast.This technology can be applied to the rotator construction of other bridge constructions such as firm structure of T type or cable stayed bridge.
Safe and reliable, equipment less investment, closure precision height, speed of application are fast, do not take under-clearance, have reduced work high above the ground to greatest extent, are particularly suitable for the busy bridge location operation of high mountains and deep gullies or shipping.
Figure of description
Fig. 1 is a location plan of the present invention
Fig. 2 is that the present invention horizontally rotates the tensiometer nomogram
Fig. 3 a is ten thousand tons of steel ball hinges of critical component of the present invention front view
Fig. 3 b is ten thousand tons of steel ball hinges of critical component of the present invention A-A sectional drawing
Among the figure: 1-knotted rope stretch-draw adjusting device, 2-knotted rope stretch-draw platform, anchoring upper support beam before the 3-steel strand knotted rope, 4-knotted rope, 5-boundary pier, section, 8-balance weight are mended in the closure arch springing place embedding of turning of dorsal funciculus behind the 6-steel strand, 7-steel tube arch rib, 9-turns and pulls rope, the last dish of 10-, the 11-lower wall, the 12-steel strand pull rope, ten thousand tons of steel ball hinged-supports of 13-, the 14-steel tube arch rib closure arch springing interim rotating hinge of turning, 15-is combined into type in advance and partly strides naked arch, anchor beam under the anchoring before the 16-knotted rope, section is mended in the embedding of 17-steel pipe donor closure span centre, the 18-platform of turning, steel spike in the last ball pivot 600# of the 19-concrete, 20-, 21-steel ball hinge location steel axle, steel ball hinge location steel bracket under the 22-, ball pivot 600# concrete under the 23-, the 24-slideway of turning.
The specific embodiment
General arrangement of the present invention as shown in Figure 1, the lower wall basis, the construction of construction → top rotary table is supported in ball pivot turntable and back, first longitudinal prestressing muscle of dish in the stretch-draw, form removal and last dish supporting system conversion → boundary pier construct and stretch-draw on coil second batch of longitudinal prestressing muscle,
Steel tube arch is pieced together in advance and to be arranged and piece together the segmenting unit manufacturing and piecing together in advance in factory of support installation → steel tube arch in advance, application, transportation is marched into the arena → is installed and cuts with scissors (14) temporarily, assembly unit steel tube arch single element one by one from bottom to top on the support of building site, measurement and positioning also weld → is partly striden steel tube arch assembly unit welding fabrication, anchor beam (4 about the button point before installing, 16) and in Saddel receiver system and boundary pier (5) construction and the stretch-draw coil second batch of longitudinal prestressing muscle → installation knotted rope (3), dorsal funciculus (6), last dish residue longitudinal prestressing muscle is by the symmetrical alternately stretch-draw of the stressing sequence of design → partly striding shaping steel tube arch (15) takes off arch, the traction system is rotated in adjustment → installation, debugging, inspection is turned, and hard support of dish forms the state that comes to nothing in the rid → dismounting of space, leaving standstill 24 hours observation stress internal force test → two sides steel tube arch turns simultaneously and puts in place → the line style measurement, to lateral inclination, axis is horizontal, along track bias is adjusted, between upper lower burrs (10,11) pad locking, the interim latch-up structure of the plane positioning → installation closure section → main steel pipe of lifting closure section, mend section (7) by the arch rib embedding of designing requirement welding → installation arch springing place, interim rotating hinge (14) is fixed → packing arch springing and perfusion upper lower burrs between concrete → alternately remove knotted rope (3) by designing program, dorsal funciculus (6), unnecessary longitudinal prestressing muscle of last dish and the whole transverse prestresses of boundary pier pier cap → backfill abut sheet stone concrete is finished the donor construction.
Horizontal swivel structure of the present invention consists of: partly stride steel tube arch (15); Boundary pier Sarasota (6), knotted rope (3) and dorsal funciculus (6) system; Turn and go up dish (10) and balance weight (8); Turntable (18) and interior steel spike (20); Steel ball hinged-support (13) and lower wall (11); Traction pulls system.
Construction sequence of the present invention is:
1 is divided into two and half with steel tube arch strides, and assembly unit is welded into and partly strides donor on the assembling support of two sides respectively;
2 use the stretch-draw jack, by classification, alternately, dish longitudinal prestressing steel wire bundle, dorsal funciculus, knotted rope in the symmetrical stretch-draw, and the dish end face is arranged balance weight on the pier rear side of boundary, move to the opposite side of steel tube arch until the center of gravity of turning, depart from the trace in ball pivot center apart from e, make and partly stride shaping steel tube arch and take off frame, remove top rotary table dish tail and support firmly; Two sides are formed one with the steel ball hinge separately and are turned;
Turn respectively with the hydraulic haulage stretch-draw jack continuously synchronously of two levels in 3 two sides, twine the steel wire bundle that also is embedded in advance on the turntable circumference by traction, form the pure couple that horizontally rotates of rotation system, at the uniform velocity continuously two sides are partly striden steel tube arch direction in accordance with regulations synchronously, horizontally rotate corresponding angle respectively to its design attitude;
4 two halves stride the arch turn put in place after, measure the linear and position deviation of donor, if have deviation then in the top rotary table rear end and both sides arrange that corresponding large-tonnage jack carries out lateral inclination, the horizontal off normal of axis and vertical deviation fine setting, the arch axial linetype adjustment back that meets design requirement be about to be gone up dish and vertically, laterally, is vertically locked fixedly, implements the span centre closure;
5 install the interim latch-up structures of arch ribs closure section, and when suitable temperature, arch rib are locked temporarily; Closure section arch rib unit piece is installed, is carried out welding of span centre donor and the welding of arch springing donor embedding benefit section by designing requirement.Concrete between packing perfusion arch springing concrete and the upper lower burrs is alternately removed successively and is coiled redundance in knotted rope, dorsal funciculus and the dismounting to prestressing tendon and boundary pier pier cap transverse prestress bundle.The backfill abut is until finishing whole work that donor is turned and joined the two sections of a bridge, etc.
The present invention requires to turn stable, and the stability calculation of swivel structure is as follows:
Calculate by the back partially steel ball hinge of the center of gravity center e=0.1～0.2m that turns, the coefficient of stability is controlled by K 〉=1.5; The calculation assumption condition: wind-force Fw=800Pa calculates; Steel concrete unit weight is pressed 25kN/m
3Meter, plain concrete is pressed 23kN/m
3Meter; Steel tube arch weld seam weight is by 1.5% of its steel work weight.
Overturning moment Mq=∑ QiLi
Stabilizing moment Mp=∑ PiLi
Coefficient of stability Kp=Mp/Mq 〉=1.5
Tractive force of the present invention calculates
The traction of steel ball hinge frictional resistance is calculated
T1＝RNμ/3D
T1-tractive force in the formula;
The N-weight of turning;
R-ball plan radius;
The D-turntable diameter;
μ-coefficient of friction resistance, μ is quiet=and 0.1, μ moving=0.06.
Outrigger reaction N1=Ne/R
The quiet R/D of tractive force T2=N1 μ
Tractive force adds up to T=2T1+T2
Every jack tractive force Ti=T/2;
Coefficient of impact η=Ti/Fi≤0.8 (Fi is the jack rated drawbar pull)
The steel ball hinged-support is the key position of construction, it is bearing the total weight of turning, its supporting capacity is 1.2 times of weight of turning, the enforcement that its position and precision influence full-bridge closure precision and turn, and it rotates slide plane is that the steel ball hinge goes up sphere and high-strength polytetrafluoroethyl-ne plate.
Anti-dumping insurance system is the safety assurance measure of rotation swivel construction method, in the process of turning, the total weight of turning is born by the steel ball hinge, but swivel structure is subjected to the influence of external condition or construction precision to occur easily tilting, and therefore the insurance steel leg must be set bear unbalanced load.Insure on the circumference at the bottom of steel leg is located at turntable, evenly arrange six steel spikes, each steel spike is filled the slightly expanded concrete welded steel pipes by two and is formed.Reserve certain interval δ=8～12mm at the bottom of the limp of steel spike and between the slideway, the shop was with corrosion resistant plate and tetrafluoro plate, with its space plug in fact when construction was turned.The belt chute surface polishing of lower wall concrete surface is to smooth smooth, and irregularity degree is not more than 3mm, and removing surface is clean and be coated with butter.Chute surface must not have any quarrel grain, obstruction and cavity.With the safety guaranteeing to turn and steadily.
For guaranteeing the stable of swivel structure, go up dish afterbody precompressed balance weight by turning and regulate center of gravity, make center of gravity be offset (generally being controlled at about 15cm) backward.Swivel structure forms three-point support by steel ball hinge and two steel legs thereafter.
The sync pulling jack of arranging with 2 cover antisymmetry provides the pure couple of horizontal rotating force, at the uniform velocity continuously two sides is partly striden steel tube arch synchronously and turns and horizontally rotate corresponding angle respectively to its design attitude, finely tunes closure.
Deviation at easy appearance, after donor is turned and is put in place, by turning spacing and fine setting, comprise the spacing built-in fitting between the lower rotary table, and each is to large-tonnage fine setting jack, deviation to the cross torsion of donor, horizontal-shift, vertical displacement is finely tuned, adjust qualified after with the donor limitation locking.
The present invention requires: node elevation deviation: ± L/4000; The horizontal off normal of axis: ± L/5000.
Ultrasonic inspection (UT): 100%; Radiographic testing (RT): 20%.
Relative two sides ball pivot center distance :≤± 2mm;
Ball pivot top mouthful wantonly 2 discrepancy in elevation :≤1mm;
Suitable bridge is to pushing up a mouthful discrepancy in elevation :≤± 1mm;
The direction across bridge top mouthful discrepancy in elevation :≤± 1.5mm.
Claims (1)
1. steel tube arch single pivot ten-thousand-tonnage horizontal rotation swivel job practices is characterized in that construction sequence is:
1. steel tube arch is divided into two and half and strides, assembly unit is welded into and partly strides donor on the assembling support of two sides respectively;
2. use the stretch-draw jack, by designing stressing sequence by classification, alternately, dish longitudinal prestressing steel wire bundle in the symmetry stretch-draw, dorsal funciculus, knotted rope, and the dish end face is arranged balance weight on the pier rear side of boundary, move to the opposite side of steel tube arch until the center of gravity of turning, depart from the trace in ball pivot center apart from e, make and partly stride shaping steel tube arch and take off frame, removing top rotary table dish tail supports firmly, rotate system own wt balance this moment, it is supported on the slideway of lower wall basis with steel ball hinge and its latter two insurance steel leg, all the other each points all come to nothing and become to turn state, and two sides respectively have one of one's own and turn;
3. turn respectively with 2 cover levels, synchronous, continuous hydraulic haulage stretch-draw jack in two sides, twine the steel wire bundle that also is embedded in advance on the turntable circumference by traction, form the pure couple that horizontally rotates of rotation system, at the uniform velocity continuously two sides are partly striden steel tube arch direction in accordance with regulations synchronously, horizontally rotate corresponding angle respectively to design attitude;
4. two halves stride the arch turn put in place after, measure the linear and position deviation of donor, have deviation then in the top rotary table rear end and both sides arrange that corresponding large-tonnage jack carries out lateral inclination, the horizontal off normal of axis and vertical deviation fine setting, the arch axial linetype adjustment back that meets design requirement be about to be gone up dish and vertically, laterally, is vertically locked fixedly, implements the span centre closure;
5. the interim latch-up structure of arch rib closure section is installed, arch rib is locked temporarily, closure section arch rib unit piece is installed, carry out welding of span centre donor and the welding of arch springing donor embedding benefit section by designing requirement, concrete between packing perfusion arch springing concrete and the upper lower burrs, alternately remove successively and coil redundance in knotted rope, dorsal funciculus and the dismounting to prestressing tendon and boundary pier pier cap transverse prestress bundle, the backfill abut is until finishing whole work that donor is turned and joined the two sections of a bridge, etc.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101689878A CN101200880A (en) | 2007-12-24 | 2007-12-24 | Steel tube arch single pivot ten-thousand-tonnage horizontal rotation swivel construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101689878A CN101200880A (en) | 2007-12-24 | 2007-12-24 | Steel tube arch single pivot ten-thousand-tonnage horizontal rotation swivel construction method |
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Cited By (16)
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| CN101864739A (en) * | 2010-06-18 | 2010-10-20 | 徐国彬 | Bridge rotation device and bridge rotation construction method |
| CN101725179B (en) * | 2009-11-06 | 2011-04-06 | 清华大学 | Construction method of integrally rotating, drawing up and slipping large steel arch structure |
| CN102031758A (en) * | 2011-01-14 | 2011-04-27 | 中铁大桥局集团有限公司 | Simply supported structure bridge horizontal swivel construction system and method |
| CN102041784A (en) * | 2011-01-07 | 2011-05-04 | 四川路桥华东建设有限责任公司 | Horizontal rotation construction technology of oversized, overweight and special-shaped construction member through multipoint hoisting and horizontal rotation hanger |
| CN102116011A (en) * | 2011-01-07 | 2011-07-06 | 中铁四局集团第二工程有限公司 | No-balance-weight horizontal-rotation construction method of steel truss girder bridge spanning railway operating line |
| CN101791645B (en) * | 2009-10-23 | 2013-01-23 | 武船重型工程股份有限公司 | Stepwise arch rib forming process of large-span spacing steel pipe arch |
| CN104099875A (en) * | 2014-07-04 | 2014-10-15 | 中国建筑第八工程局有限公司 | Traction structure for construction of vertical rotating body of arch rib and traction construction method |
| CN105421248A (en) * | 2015-12-31 | 2016-03-23 | 中铁二十局集团第一工程有限公司 | Swivel and closure construction method for large-span continuous beam crossing existing station |
| CN106758867A (en) * | 2017-01-18 | 2017-05-31 | 中电建路桥集团有限公司 | A kind of Bridge Rotation Construction Technique control method for fully automatic |
| CN106836010A (en) * | 2017-03-31 | 2017-06-13 | 中铁二院工程集团有限责任公司 | A kind of Deck Arch Bridges imbalance horizontal swing system and rotation swivel construction method |
| CN107313359A (en) * | 2016-04-27 | 2017-11-03 | 成都亚佳工程新技术开发有限公司 | One kind is general to exempt from steel bridge Rotary ball hinge system of weighing |
| CN108316161A (en) * | 2018-01-18 | 2018-07-24 | 重庆大学 | Bridge turns BEI-DOU position system automatically |
| CN111851305A (en) * | 2020-07-29 | 2020-10-30 | 中铁十八局集团第二工程有限公司 | Method for dismantling temporary support on arch of large-span bridge |
| CN112144421A (en) * | 2020-09-04 | 2020-12-29 | 中铁大桥局第七工程有限公司 | Construction method for three-point supporting balance rotation of rotation bridge |
| CN113668408A (en) * | 2021-08-24 | 2021-11-19 | 中铁工程设计咨询集团有限公司 | Self-falling beam swivel spherical hinge |
| CN113718663A (en) * | 2021-05-24 | 2021-11-30 | 中铁三局集团有限公司 | Railway cable tower construction method for spanning multi-track operation line |
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2007
- 2007-12-24 CN CNA2007101689878A patent/CN101200880A/en active Pending
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| CN101791645B (en) * | 2009-10-23 | 2013-01-23 | 武船重型工程股份有限公司 | Stepwise arch rib forming process of large-span spacing steel pipe arch |
| CN101725179B (en) * | 2009-11-06 | 2011-04-06 | 清华大学 | Construction method of integrally rotating, drawing up and slipping large steel arch structure |
| CN101864739A (en) * | 2010-06-18 | 2010-10-20 | 徐国彬 | Bridge rotation device and bridge rotation construction method |
| CN102041784A (en) * | 2011-01-07 | 2011-05-04 | 四川路桥华东建设有限责任公司 | Horizontal rotation construction technology of oversized, overweight and special-shaped construction member through multipoint hoisting and horizontal rotation hanger |
| CN102116011A (en) * | 2011-01-07 | 2011-07-06 | 中铁四局集团第二工程有限公司 | No-balance-weight horizontal-rotation construction method of steel truss girder bridge spanning railway operating line |
| CN102116011B (en) * | 2011-01-07 | 2012-12-05 | 中铁四局集团第二工程有限公司 | No-balance-weight horizontal-rotation construction method of steel truss girder bridge spanning railway operating line |
| CN102031758A (en) * | 2011-01-14 | 2011-04-27 | 中铁大桥局集团有限公司 | Simply supported structure bridge horizontal swivel construction system and method |
| CN102031758B (en) * | 2011-01-14 | 2013-02-13 | 中铁大桥局集团有限公司 | Simply supported structure bridge horizontal swivel construction system and method |
| CN104099875B (en) * | 2014-07-04 | 2016-05-11 | 中国建筑第八工程局有限公司 | A kind of hitch structure of arch rib vertical rotator construction and drag construction method |
| CN104099875A (en) * | 2014-07-04 | 2014-10-15 | 中国建筑第八工程局有限公司 | Traction structure for construction of vertical rotating body of arch rib and traction construction method |
| CN105421248A (en) * | 2015-12-31 | 2016-03-23 | 中铁二十局集团第一工程有限公司 | Swivel and closure construction method for large-span continuous beam crossing existing station |
| CN107313359B (en) * | 2016-04-27 | 2023-05-05 | 成都亚佳工程新技术开发有限公司 | General weighing-free steel bridge swivel spherical hinge system |
| CN107313359A (en) * | 2016-04-27 | 2017-11-03 | 成都亚佳工程新技术开发有限公司 | One kind is general to exempt from steel bridge Rotary ball hinge system of weighing |
| CN106758867A (en) * | 2017-01-18 | 2017-05-31 | 中电建路桥集团有限公司 | A kind of Bridge Rotation Construction Technique control method for fully automatic |
| CN106836010A (en) * | 2017-03-31 | 2017-06-13 | 中铁二院工程集团有限责任公司 | A kind of Deck Arch Bridges imbalance horizontal swing system and rotation swivel construction method |
| CN108316161A (en) * | 2018-01-18 | 2018-07-24 | 重庆大学 | Bridge turns BEI-DOU position system automatically |
| CN108316161B (en) * | 2018-01-18 | 2023-08-11 | 重庆大学 | Automatic bridge turning Beidou positioning system |
| CN111851305A (en) * | 2020-07-29 | 2020-10-30 | 中铁十八局集团第二工程有限公司 | Method for dismantling temporary support on arch of large-span bridge |
| CN112144421B (en) * | 2020-09-04 | 2022-04-01 | 中铁大桥局第七工程有限公司 | Construction method for three-point supporting balance rotation of rotation bridge |
| CN112144421A (en) * | 2020-09-04 | 2020-12-29 | 中铁大桥局第七工程有限公司 | Construction method for three-point supporting balance rotation of rotation bridge |
| CN113718663A (en) * | 2021-05-24 | 2021-11-30 | 中铁三局集团有限公司 | Railway cable tower construction method for spanning multi-track operation line |
| CN113668408A (en) * | 2021-08-24 | 2021-11-19 | 中铁工程设计咨询集团有限公司 | Self-falling beam swivel spherical hinge |
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