CN100478521C - Overline strand suspension bridge construction by drawing anchor - Google Patents
Overline strand suspension bridge construction by drawing anchor Download PDFInfo
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- CN100478521C CN100478521C CNB2006100387471A CN200610038747A CN100478521C CN 100478521 C CN100478521 C CN 100478521C CN B2006100387471 A CNB2006100387471 A CN B2006100387471A CN 200610038747 A CN200610038747 A CN 200610038747A CN 100478521 C CN100478521 C CN 100478521C
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Abstract
This is an operation method for straining anchor span cable rope of flying-bridge to accurately control tower pier's line shape. A cable saddle is fixed to the top of the cable tower. Cable ropes are lute in the saddle groove and anchored to anchor head which is jointed to the front anchor surface through a fixing rod. A straining device composed by lifting jack, supporting foot and connecting sleeve is installed to the anchor head. During the bridge contracture, the straining device could be started step by step to anchor span the cable rope and resume tower shifting to zero.
Description
Technical field:
The present invention relates to a kind of job practices of suspension bridge, particularly a kind of method of suspension bridge superstructure work progress.
Background technology:
China is since the construction that enters modern suspension, and its design theory and bridge construction technology be advanced international standard day by day, and has built up the suspension bridge of many each tool school characteristics.At present, in the design and work progress of suspension bridge, for the stress that guarantees structure with linear with design consistently, require between two anchorages, the main push-towing rope stress-less length between anchorage and the saddle remains unchanged when setting up and later on.According to this requirement, usually the job practices of suspension bridge is: with the stress-less length of respectively striding main push-towing rope be the horizontal component of definite value, both sides, bridge tower top main push-towing rope equate, loose cable saddle (cover) both sides main push-towing rope tension force equal be condition, calculate the span of respectively striding when setting up main push-towing rope and linear, with each saddle by span setting of calculating and interim locking; Linear with theory is target, adjusts and respectively strides the linear and anchor span tension force of main push-towing rope, then main push-towing rope is carried out permanent anchoring; After main push-towing rope sets up and finishes, cord clip is installed, and the lifting stiff girder loosens each saddle, allow each saddle get back to the permanent location (, needing the pushing tow saddle just can make it get back to the permanent location of design sometimes) of design gradually along with the lifting of stiff girder if the frictional force at the bottom of the saddle is bigger.Because main push-towing rope only is subjected to the own wt effect during empty cable, the main push-towing rope span of calculating by the dynamic balance condition during therefore empty cable is unequal when becoming bridge, just each saddle need be departed from permanent location, and it is inclined to one side in advance that saddle promptly is set.For the pre-inclined to one side setting of saddle, usual way has two kinds: first kind of vertical state that keeps tower when being the frame cable, saddle is become bridge design attitude certain distance at the position deviation of cat head, when causing bridge tower off-design position during the lifting stiff girder, saddle is returned back to top to design attitude, design attitude is got back at the saddle center when making into bridge again; Second kind is for relatively more flexible head tower, can adopt interim drag-line, and with the pre-horizontal range that needs partially in bridge tower top, and saddle is installed in design cat head position, during constructions such as lifting stiff girder, loosens interim drag-line gradually, makes bridge tower return to the position of design gradually.Therefore, this job practices often needs the pre-deviator of pushing tow operation is carried out strict control, and need carry out the pushing tow operation at cat head, and its operating risk is big, operating environment is abominable, and the pushing tow saddle need just can carry out on bigger cat head cross section.
Summary of the invention:
Technical problem to be solved by this invention is: be intended to overcome the deficiency that exists in the above-mentioned existing suspension bridge construction process, a kind of pushing tow that neither needs is provided, not controlled by the strictness of the pre-deviator of pushing tow operation, can can accurately control the method for the linear stretch-draw anchor span strand suspension bridge construction of king-post at Ground Operation.Its technical scheme is: a kind of method of stretch-draw anchor span strand suspension bridge construction comprises
When 1) building Sarasota, adopt the bolt weldering main cable saddle to be consolidated in the Sarasota top in conjunction with assembling;
2) at Sarasota top place, the every rhizoid thigh in the main push-towing rope is embedded in the main cable saddle groove, thread is wrapped up in by the sealing strand clip pack after by cat head, main push-towing rope is dispersed by the noose that looses at IP point place to be single thread;
3) every rhizoid thigh is by the thread anchor cup anchoring on the strand anchor head, and the strand anchor head is connected with the connector that is anchored in preceding anchor face by prestressed strand by two anchoring rods; Fix by internal and external spherical surfaces packing ring and locking nut at the end that anchoring rod is connected with the strand anchor head, and the tensioning equipment that is made of jack is installed;
4) after the thread installation is set up and is finished, carry out the adjustment of empty cable type of main push-towing rope and anchor span pulling force earlier, for the mode of eliminating the cat head level by the stretch-draw anchor span strand, it is identical that the initial stress of thread must keep, and the difference of control thread anchor span tension force and design load is in ± 10kN scope;
5) in stride in the work progresss such as cord clip, hoist cable, stiff girder, bridge deck, owing to load cause cat head in stride the direction horizontal movement when reaching 20-50mm, promptly start tensioning equipment stage by stage thread is carried out anchor span stretch-draw, be no more than the designing requirement that thread stress difference in 50mm and the stretching process is no more than 150MPa all the time to guarantee the cat head horizontal movement;
When 6) becoming bridge, adopt stretch-draw that thread is carried out the final stretch-draw adjustment of anchor span, make the cat head displacement return to nought state, and remove tensioning equipment;
It is characterized in that:
Described tensioning equipment also comprises spike and branch sleeve and instrument pull bar, and the two ends of branch sleeve are connected with the instrument pull rod screw with anchoring rod respectively, and the other end of instrument pull bar is fixed by the instrument nut after passing the pull bar chamber of establishing in the jack;
Each rhizoid thigh is provided with two jack, and during installation, two jack are parallel to anchoring rod respectively and are connected with spike, and jack is vertical with the plane of spike, and two spikes on the same strand anchor head utilize retainer to be connected as a single entity, and utilize thread to support;
52 above-mentioned tensioning equipments are installed, and same anchor chamber adopts 52 jack to pass through multichannel combined shunting valve fuel feeding by same pumping plant simultaneously, and by flow and the pressure of accumulator as distribution of compensation each minute oil sources.
Compared with prior art, its technique effect is: because main cable saddle is consolidated in cat head, Ground Operation is transferred in the operation of cat head pushing tow, thereby improved operating environment, reduced operating risk; And can accomplish substantially that when the stretch-draw anchor span thread stress is even to the thread stretch-draw that repeatedly circulates, make the target of design stretch-draw buret reason more effective, more direct; And tensioning equipment is not controlled by the strictness of the pre-deviator of conventional pushing tow operation, eliminates the inaccurate influences of material behavior such as king-post bullet mould, main push-towing rope bullet mould, can accurately control the king-post linearity, makes it return to nought state.Therefore, job practices of the present invention has not only been opened up another and has been different from the new method and the new way of pushing tow cable saddle method suspension bridge construction, and proved also that by practice this job practices is correct, reasonably, be practicable, both for stretch-draw anchor span strand suspension bridge construction provides successful example, also the popularization for the job practices of this suspension bridge provides technical guarantee.
Description of drawings:
Fig. 1 is a Lancang River of the present invention suspension bridge general arrangement;
Fig. 2 is the main push-towing rope profile;
Fig. 3 is the noose structural representation that looses;
Fig. 4 is the tensioning equipment connection diagram;
The synchronous many tops of power tensioning equipment hydraulic pressure conveying schematic diagrames such as Fig. 5 is.
The specific embodiment:
Lancang River suspension bridge (see figure 1) is positioned at national highway 214 line Yunnan auspicious clouds to highway K122+616 place, Lincang, across the Lancang River, is an important tie that connects state, Dali, Yunnan Province and Lincang Prefecture.Bridge total length 716m, main bridge are the steel-mixed superposed beam suspension bridge of striding footpath 380m.Main push-towing rope 1 is striden the footpath and is striden structure for three of 120m+380m+120m, bridge overall with 16.6m, bridge floor effective width 12.4m, curb-to-curb width 11.0m, be provided with 2% two-way horizontal wall inscription in the runway, bridge floor is provided with 1% two-way longitudinal gradient, and bridge is positioned on the convex vertical curve of radius R=27000m, design load vapour-surpass 20 grades hangs-120.Basic earthquake intensity 8 degree.Sarasota adopts portal frame construction, and king-post is solid steel bar concrete flexible structure, square-section, auspicious cloud bank tower height 88.0m, Lincang bank tower height 90.0m.Sarasota direction across bridge king-post all tilts to the inside with 1/20 slope, and king-post top transverse center is apart from 12.4m, and the bottom transverse center is apart from 21.2m.The king-post direction across bridge is pressed the wide design of 2.5m, and suitable bridge is to being gradient to cat head width 3.0m by tower bottom width degree 4.0m.Sarasota is provided with the twice crossbeam altogether below cat head and stiff girder fulcrum, crossbeam adopts the solid section prestressed reinforced concrete construction, highly is 3.0m, top rail width 2.8m, lower transverse beam width 3.26m.The Sarasota pile foundation adopts the large-diameter bored pile of diameter 5.5m, and each king-post is provided with a pile, and the pile foundation vertical is provided with, and pile foundation adopts the C25 concrete.Because of two sides geological condition difference, the long 30m that is of auspicious cloud bank stake, the Lincang on the bank, long 45m and the 55m of being respectively of downstream stake.
Anchorage adopts the steel bar concrete gravity anchor, and anchorage overall height 20.0m is made up of basis, forward and backward anchor block and anchor chamber three parts.The Anchor Foundation height is 5.0m, and planar dimension 28.0m * 28.0m adopts the C25 concrete.Anchor connection system by thread anchoring rod and prestress anchoraging steel Shu Zucheng is set in the preceding anchor block, and lays the shape steel bracket that supports the anchor connection system, employing C40 prestressed reinforced concrete.Back anchor block adopts the C25 concrete, is mainly used in ballast and sealing anchoring prestressed anchor.
Steel-the aliasing of putting more energy into closes the single span suspension bridge of bridge floor because this suspension bridge is the steel plate of a main span 380mm, the bridge tower design section is less, and adopt the noose that looses to disperse the main push-towing rope thread, for avoiding, so design adopts bolt weldering assembling that main cable saddle directly is permanently secured to the Sarasota top because of pushing tow master saddle need increase the cat head cross section.Main push-towing rope stride the footpath for 120m+380m+120m three stride structure, be designed under the bridge state, in stride theory and stride the footpath and be 380m, theoretical sag 35.0m, sag ratio 1: 10.857, end bay is symmetry fully, the end bay sag ratio is about 1: 2.715.The job practices (PPWS method) that main push-towing rope adopts prefabricated parallel steel wire thread to set up by root.Totally 2 of full-bridges, each one of upstream and downstream.Every main push-towing rope is made up of the 52 strands 91 zinc-plated high tensile steel wires of φ 5.0mm, totally 4732 of every main push-towing ropes.Behind the tight cable, main push-towing rope is circular (see figure 2), and its diameter is 370mm (cord clip place) and 375mm (between cord clip), and void content is 16% (cord clip place) and 18% (between cord clip).When setting up main push-towing rope the every rhizoid thigh in the main push-towing rope is become in the square embedding main cable saddle groove by regular hexagon, thread is wrapped up in by the sealing strand clip pack after by cat head and is changed to circle.
Main push-towing rope sets up to guarantee that the main span stress-less length is a condition, calculate the linear and internal force of main span by the design span, equate that with bridge tower both sides main rope force level component equaling into the bridge value with end bay and anchor span stress-less length is condition, calculate the position of loose noose and main push-towing rope anchor point.Main push-towing rope is separated into single thread at IP point (see figure 1) place by the noose (see figure 3) of loosing.Every rhizoid thigh all with strand anchor head 12 (see figure 4)s on the anchoring of thread anchor cup, the thread anchor head by two anchoring rods be anchored in by prestressed strand before the connector 2 of anchor face be connected; Fix by internal and external spherical surfaces packing ring and locking nut respectively at the end that anchoring rod is connected with the thread anchor head, and two tensioning equipments that are made of jack 10, spike 7 and branch sleeve 8 and instrument pull bar 9 are installed respectively.
The two ends of branch sleeve 8 are threaded with anchoring rod 3 and instrument pull bar 9 respectively, and the other end of instrument pull bar is fixed by instrument nut 11 after passing the pull bar chamber of establishing in the jack 10.During installation, two jack 10 should be parallel to anchoring rod 3 respectively and be connected with spike 7, and jack should be vertical with the plane of spike, and two spikes on the same strand anchor head 12 utilize special retainer 13 to be connected as a single entity, and utilize thread 14 to support.One side of spike 7 is provided with opening, enters special torque spanner when being convenient to stretch-draw internal and external spherical surfaces packing ring 4,5 and the locking nut 6 that is located on the anchoring rod carried out 120 ° of rotations, follow-up.
According to " many top " of Lancang River suspension bridge thread tensioning equipment designing requirement, " etc. power synchronous ", and factors such as duration, economy, operability have been taken all factors into consideration, determine to use 52 of above-mentioned tensioning equipments, the stretching force of each jack is that 1200kN, tentioning stroke are 100mm.And same anchor chamber adopts 52 jack to pass through multichannel combined shunting valve 17 fuel feeding by same pumping plant 16 simultaneously, and by flow and the pressure (see figure 5) of custom-designed accumulator 18 as distribution of compensation each minute oil sources, for dependable flow, pressure satisfy the construction control precision again, pumping plant adopts precision mechanical synchronization higher, simple in structure.
After the thread installation is set up and finished, carry out the adjustment of empty cable type of main push-towing rope and anchor span pulling force earlier, the thread of each anchorage is time stretch-draw in two batches.Be after half thread stretch-draw finishes, after jack, spike and branch sleeve are removed, again it be mounted to second half thread and proceed stretch-draw by above program.For the mode of eliminating the cat head level by the stretch-draw anchor span strand, it is identical that the initial stress of thread must keep, and the difference of control thread anchor span tension force and design load is in ± 10kN scope.
Main push-towing rope sets up, adjust finish after, in stride in the work progresss such as cord clip, hoist cable, stiff girder, bridge deck, constantly apply in the process owing to carrying at main axle load, the king-tower king-post must occur to span centre skew load and cause cat head in when striding direction horizontal movement 20-50mm, promptly install, start tensioning equipment stage by stage the thread of each anchorage time is carried out anchor span stretch-draw in two batches, be no more than all the time to guarantee the cat head horizontal movement that the thread stress difference is no more than 150MPa in 50mm and the stretching process.
When becoming bridge, carry out final stretch-draw adjustment to the thread of each anchorage is inferior in two batches, make the cat head displacement return to nought state, and remove tensioning equipment with tensioning equipment.
Should be undertaken by following technological requirement during the synchronous many tops of power such as employing stretch-draw operations:
(1) jack and locking nut are installed
1. anchoring rod, connector, locking nut and the internal and external spherical surfaces packing ring instrument pull bar, the instrument nut that carry out anchoring rod and the supporting rupture pull force test of locking nut and branch sleeve and jack by the design drawing requirement carries out the combined strength test, and result of the test should meet the mechanical performance of respective material.
2. owing to adopt stretch-draw anchor span strand suspension bridge construction, anchoring rod length reaches 1.98m, so want significant care when installing, prevents to damage screw thread.
3. anchoring rod should install before the thread traction pulls in advance, adjusts to the right place, and the anchoring rod of installing is in advance supported with lumps of wood head.
4. two anchorages and a line left side, the right front anchor face of line are all installed 52 jack and spike simultaneously, and 26 corresponding identical rhizoid thighs of numbering are installed.
5. the making of the instrument pull bar of jack will be determined length according to monitoring unit anchor cup position, prevents that the branch sleeve of instrument pull bar from conflicting with stretching extension, hinders tentioning stroke.
To be connected firmly with branch sleeve when 6. the instrument pull bar of jack is installed, and carry out the combined strength test of instrument pull bar and branch sleeve; Whether the screw thread of checking tool pull bar and instrument nut has the damage phenomenon, if find damage, and trimming in time or replacing.
(2) preparation before the stretch-draw
Whether the stretching force position of 1. checking jack before the stretch-draw operation overlaps consistent with the axis of pull bar.
2. check whether internal and external spherical surfaces packing ring and locking nut all are in place.
3. it is firm, tight to check whether jack is connected with oil pump into and out of oil pipe.
4. design, monitor to assign and to carry out stretch-draw after stretch-draw is instructed.
5. the right synchronization job face in the line left side of two sides anchorage, line, it is synchronous to carry out count off by four Walkie talkies.
6. the elongation of reply stretching force and corresponding oil meter reading, anchoring rod is wanted tabulation before the stretch-draw, and for using in the construction, various check tables are complete.
7. should finish the linear measurement of the displacement of king-post and main push-towing rope and preparation of cable force measurement and every test etc. during stretch-draw.
8. before the stretch-draw thread, the stretch-draw jack should be demarcated with the mutual corresponding classification of rope force tester, to reach the purpose of mutual check.
(3) by design, the given thread stretch-draw amount of monitoring, stretch-draw is carried out in classification.
(4) 52 jack synchronous tensions, forward in the anchor face motion process, internal and external spherical surfaces packing ring and locking nut should in time follow up at jack jacking and thread anchor head, locking nut follow-up special messenger carries out, anti-leak-stopping is twisted locking nut, adopts and checks count off, all tightens the detachable tensioning equipment in rear.The moment of torsion of the locking nut of same anchoring rod is answered basically identical.
(5) to measure accurately stretching force during anchor span strand stretch-draw,, make it to meet design requirement so that in time adjust stress difference between thread by synchronous tension equipment.Want detail record oil meter reading, Suo Li and thread stretch-draw amount in the stretching process, use the adhesive plaster mark stretch-draw position of different colours at last, be convenient to mutual check.
(6) Suo Li that should take stretching force and monitoring to record in the stretching process checks mutually; With the simultaneous tension of bank anchorage, and check mutually, measure the Sarasota distortion simultaneously.
(7) after half thread stretch-draw finishes, jack, spike and branch sleeve are mounted to second half proceed stretch-draw by above program.
(8) after stretch-draw is finished, record master control power and corresponding oil pressure gauge reading, and the measuring of total stretch-draw amount, and the relative position of record locking nut.
(9) after stretch-draw is all finished, check the tightness of locking nut.
(10) in the thread stretching process, the stretch-draw situation of jack tension power, Sarasota displacement and thread should be fed back to design, monitoring.
(11) preservative treatment is carried out on the anchoring rod surface.
The problem that should note when (12) the stretch-draw anchor span strand is constructed:
1. design pitch will guarantee the installation of jack and easy to operate between thread.
The anchoring rod of 2. anchor connection system is wanted add-on security stretch-draw distance except that to the careful consideration of stretch-draw amount, but considers the adverse effect and the operability of secondary stress when installing, and anchoring rod should not design oversize.
3. the initial installation site of thread anchor head and initial tensioning force all will accurately be controlled.
4. particular design all will be done in the cooperating of stretch-draw jack and spike, the internal diameter size of spike and the location of stretch-draw jack and spike, guarantees the operability and the stability under loading of rotary nut, unlikely generation unbalance loading and damage screw thread.
5. the stretching process cue is unimpeded, adopt the information transmitting methods of count off stretch-draw and intercommunication stretch-draw value.
Succeeding in developing of " stretch-draw anchor span strand method " suspension bridge construction complete set technology, filled up domestic multinomial suspension bridge bridge construction technological gap, start the new technology, the new technology that are different from pushing tow cable saddle method suspension bridge construction, widened construction, design, monitoring new thinking aspect suspension bridge.Its successful Application is domestic and even the leap again of world's suspension bridge construction, has long-range economic benefits, and following suspension bridge construction is had important guidance and reference significance.
Claims (1)
1, a kind of method of stretch-draw anchor span strand suspension bridge construction comprises
When 1) building Sarasota, adopt the bolt weldering main cable saddle to be consolidated in the Sarasota top in conjunction with assembling;
2) at Sarasota top place, the every rhizoid thigh in the main push-towing rope is embedded in the main cable saddle groove, thread is wrapped up in by the sealing strand clip pack after by cat head, main push-towing rope is dispersed by the noose that looses at IP point place to be single thread;
3) every rhizoid thigh is by the thread anchor cup anchoring on the strand anchor head, and the strand anchor head is connected with the connector that is anchored in preceding anchor face by prestressed strand by two anchoring rods; Fix by internal and external spherical surfaces packing ring and locking nut at the end that anchoring rod is connected with the strand anchor head, and the tensioning equipment that is made of jack is installed;
4) after the thread installation is set up and is finished, carry out the adjustment of empty cable type of main push-towing rope and anchor span pulling force earlier, for the mode of eliminating the cat head level by the stretch-draw anchor span strand, it is identical that the initial stress of thread must keep, and the difference of control thread anchor span tension force and design load is in ± 10kN scope;
5) in stride in the work progresss such as cord clip, hoist cable, stiff girder, bridge deck, owing to load cause cat head in stride the direction horizontal movement when reaching 20-50mm, promptly start tensioning equipment stage by stage thread is carried out anchor span stretch-draw, be no more than the designing requirement that thread stress difference in 50mm and the stretching process is no more than 150MPa all the time to guarantee the cat head horizontal movement;
When 6) becoming bridge, adopt stretch-draw that thread is carried out the final stretch-draw adjustment of anchor span, make the cat head displacement return to nought state, and remove tensioning equipment;
It is characterized in that:
Described tensioning equipment also comprises spike and branch sleeve and instrument pull bar, the two ends of branch sleeve (8) are threaded with anchoring rod (3) and instrument pull bar (9) respectively, and the other end of instrument pull bar is fixed by instrument nut (11) after passing the pull bar chamber of establishing in the jack (10);
Each rhizoid thigh is provided with two jack, during installation, two jack are parallel to anchoring rod (3) respectively and are connected with spike (7), jack is vertical with the plane of spike, two spikes on the same strand anchor head (12), utilize retainer (13) to be connected as a single entity, and utilize thread (14) to support;
52 above-mentioned tensioning equipments are installed, and same anchor chamber adopts 52 jack to pass through multichannel combined shunting valve (17) fuel feeding by same pumping plant (16) simultaneously, and by flow and the pressure of accumulator (18) as distribution of compensation each minute oil sources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100387471A CN100478521C (en) | 2006-03-06 | 2006-03-06 | Overline strand suspension bridge construction by drawing anchor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100387471A CN100478521C (en) | 2006-03-06 | 2006-03-06 | Overline strand suspension bridge construction by drawing anchor |
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| CN1818218A CN1818218A (en) | 2006-08-16 |
| CN100478521C true CN100478521C (en) | 2009-04-15 |
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| CNB2006100387471A Expired - Fee Related CN100478521C (en) | 2006-03-06 | 2006-03-06 | Overline strand suspension bridge construction by drawing anchor |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1936189B (en) * | 2006-10-13 | 2010-04-14 | 浙江省舟山连岛工程建设指挥部 | Method for erecting guide-cable in suspension cable bridge traction system |
| CN101177931B (en) * | 2007-12-05 | 2011-08-10 | 中铁大桥局股份有限公司 | Erection of gantry type small-cycle traction system on large-span suspension bridge main cable |
| CN101236116B (en) * | 2008-02-28 | 2011-09-07 | 中铁大桥勘测设计院有限公司 | Method for determining stranded stayed single cable initial tensioning force |
| CN101608429B (en) * | 2008-06-20 | 2012-09-05 | 上海浦江缆索股份有限公司 | Method for manufacturing high strength and large specification wire rope sling |
| CN103774559B (en) * | 2014-01-21 | 2016-05-04 | 中交第一公路工程局有限公司 | The adjusting device of a kind of sling of suspension bridge Suo Li and elevation |
| CN109113183B (en) * | 2018-09-28 | 2020-07-14 | 同济大学 | Construction method based on large-span self-forming type suspension cable structure |
| CN109295859B (en) * | 2018-10-18 | 2023-12-19 | 柳州欧维姆机械股份有限公司 | Tensioning device for front supporting point hanging construction and tensioning construction method thereof |
| CN109440643A (en) * | 2018-11-21 | 2019-03-08 | 中交第公路勘察设计研究院有限公司 | Main rope of suspension bridge thread anchor |
| CN110939066B (en) * | 2019-12-06 | 2021-08-03 | 中铁大桥勘测设计院集团有限公司 | Method for determining tension of anchor cross-wire strand |
| CN111651821B (en) * | 2020-05-29 | 2023-06-16 | 中铁大桥勘测设计院集团有限公司 | Method for determining positions of strand separation points in loose cable sleeve |
| CN112195794A (en) * | 2020-11-03 | 2021-01-08 | 云南交投集团云岭建设有限公司 | Construction process for gravity type anchorage of large-span suspension bridge by adopting loose cable sleeve |
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