CN101967800B - Erecting, pushing and sliding method of steel box beam - Google Patents
Erecting, pushing and sliding method of steel box beam Download PDFInfo
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- CN101967800B CN101967800B CN201010547756A CN201010547756A CN101967800B CN 101967800 B CN101967800 B CN 101967800B CN 201010547756 A CN201010547756 A CN 201010547756A CN 201010547756 A CN201010547756 A CN 201010547756A CN 101967800 B CN101967800 B CN 101967800B
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Abstract
The invention relates to the technical field of bridge engineering construction, in particular to an erecting, pushing and sliding method of a large-tonnage steel box beam. The method comprises the following steps of: firstly, arranging flat steel gasket boxes at the top of each bridge pier to obtain a plane, mounting a driving pusher or a driven pusher and hydraulic jacks for lifting and falling the beam on the plane and moving the steel box beam into the bridge pier; then, starting the driving pusher to drive the steel box beam bodies to slide forwards, simultaneously lifting the hydraulic jacks for lifting and falling the beam to jack the steel box beam after a piston travel is finished, returning the driving pusher to an initial position and falling the hydraulic jacks; and repeating the piston travel to move the steel box beam in place. The method of the invention can be used to safely, rapidly, accurately and continuously realize the longitudinal in place of steel box beams and has controllable pushing and longitudinally moving speed without arranging an upper slideway or a lower slideway so as to save a great amount of rail devices and labor without occupying riverway space.
Description
Technical field
The present invention relates to the bridge engineering technical field of construction, be specifically related to a kind of thrusting slip method of setting up of large-tonnage steel case beam.
Background technology
The design of incremental launching method derives from the longitudinal pull construction method of steel bridge.And in incremental launching method, use jack to replace hoist engine and coaster, replaced cylinder with board-like sliding support.These replacements have improved the stress that the line bearing effect of the impact that causes owing to hoist engine and tackle pulley and cylinder causes and have concentrated when starting.From then on after, incremental launching construction technology has obtained developing rapidly and improving.
The incremental launching method principle is behind the platform of bridge y direction segmented consolidation shed to be set, and segmented spliced girder body is after the stretch-draw of longitudinal prestressing muscle, by the level jack application of force, by slideway, slide block, with beam pushing tow forward piecemeal, the beam that falls after in place is changed formal bearing.The key of incremental launching construction method is the pushing tow operation, and core is to use limited top power and back is pushed away in place.The incremental launching construction method mainly is divided into single-point pushing tow and multi-point pushing at present, its pushing tow dynamical system can be pace type pushing tow or successively incremeantal launching method, supporting system can be the sliding bearing of interim slideway or use and permanent bearing dual-purpose, the pushing tow direction can be unidirectional pushing tow or two-way pushing tow, and the case beam can prefabricated spelling segmentation pushing tow or prefabricated piecemeal pushing tow piecemeal.
In the prior art, often need to use interim slideway supporting in the erection process of steel case beam, and frictional resistance is big during thrusting slip, need great jacking force, corresponding thrustor complex structure heaviness, be easy to generate very big noise and vibrations during the pushing tow operation, bridge pier and equipment are produced certain impact.Simultaneously, inevitably to take lifting, the installation work of constructing in the river course in the erection process of steel case beam, influence the normal current of river course.Adopt wheel-track type the track roller device must be set, girder steel center of gravity height.Substitute in the time of need falling beam; And adopt the support method need take river course and a large amount of structural meterialss.
Summary of the invention
The objective of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of thrusting slip method of setting up of steel case beam is proposed, adopt double-act-ing hydraulic J-Horner and oil pump station push-and-pull to come and go sliding planker technology, the contact friction face of slide type hydraulic top pushing device adopts the novel materials combination, frictional resistance is little, and make full use of girder steel self rigidity and need not to be provided with the supporting of interim slideway, with vertical jacking, the beam hydraulic jack that falls coordinating operation just can be finished the bridge erection construction of striding the continuous all kinds of steel in footpath-mixed structure greatly, can promote operating efficiency greatly, construction stability, convenient, do not take the river course substantially.
Purpose of the present invention realizes being finished by following technical scheme:
A kind of thrusting slip method of setting up of steel case beam, behind the platform of bridge y direction, segmented consolidation shed is set, segmented jointing steel box beam beam body, then with beam thrusting slip forward piecemeal, beam falls after in place, change formal bearing, wherein, be furnished with the beam that rises and falls hydraulic jack and passive pusher or active pusher at each bridge pier Dun Ding, described passive pusher comprises supporting plate, described supporting plate is fixedly installed in bridge pier Dun Ding, and its upper surface has chute; Described active pusher mainly is made up of mounting plate, bottom plate and pushing tow power set, and mounting plate is fixedly installed in bridge pier Dun Ding, and forming " U " type slideway between upper and lower supporting plate also can be along the relative motion of " U " type slideway; Described steel box girder body presses the mounting plate upper surface in described active pusher, by the steel box girder body slippage forward on pushing tow power set drive mounting plate and the mounting plate thereof, the piston stroke traveling for the treatment of described pushing tow power set finishes, the described beam hydraulic jack of rising and falling simultaneously hoists, jack-up steel case beam, and the pushing tow power set are returned to initial piston position, fall described hydraulic jack again, repeat the piston stroke of pushing tow power set, make steel case beam arrive another bridge pier from a bridge pier, and " U " type slideway of the passive pusher of on described another this bridge pier of bridge pier upper edge, installing or initiatively the chute of pusher continue to slide, until making steel case beam move in place.
On " U " type slideway of above-mentioned active pusher polyfluortetraethylene plate is installed, described mounting plate bottom is installed with corrosion resistant plate.
Be embedded with corrosion resistant plate on the chute of above-mentioned passive pusher, described corrosion resistant plate upper surface is placed with polyfluortetraethylene plate, and described polyfluortetraethylene plate can sliding motion in chute.
Above-mentioned the setting up in the thrusting slip process of steel case beam, be provided with an initiatively pusher at least;
Setting up in the thrusting slip process of steel case beam, when the described beam that rises and falls that hoists was used hydraulic jack, described passive pusher or active pusher can unload from the bridge pier Dun Ding of installation site, and are installed on other bridge pier Dun Ding;
Initiatively pusher or passive pusher and hydraulic jack of two groups of symmetric arrangement at least on each bridge pier Dun Ding;
Setting up in the thrusting slip process of steel case beam, elder generation obtains burnishing surface at each bridge pier Dun Ding layout leveling steel pad case, and the beam that rises and falls hydraulic jack and passive pusher or active pusher then are installed on described burnishing surface.
Above-mentioned pier top bridge center line is provided with the transit that observation steel case beam center line changes, and passes through to observe described transit to correct the skew of beam body midline position in moving the beam process.
Advantage of the present invention is, use the inventive method can realize the Steel Continuous Box safety beam, rapidly, vertical shift accurately is in place, upper and lower slideway can be set, thereby save a large amount of track equipment and labour, and not take the space, river course.The thrustor that is adopted is simple in structure, it is compact to install, and durability degree height has noiselessness, advantage such as shockproof, with low cost, and wherein the abrasion resistance of gliding material, slip ability are good.Move in the beam process, do not have impulse inertia by hydraulic pushing, the suffered horizontal thrust of bridge pier is little, advances steadily pushing tow vertical shift speed-controllable.
Description of drawings
Fig. 1 is the pushing tow hydraulic schematic diagram;
Fig. 2 is the jacking hydraulic schematic diagram;
Fig. 3 is the structural representation of active pusher;
Fig. 4 is the vertical view of active pusher mounting plate;
Fig. 5 is the A-A face schematic diagram of Fig. 4;
Fig. 6 is the vertical view of active pusher bottom plate;
Fig. 7 is the B-B face schematic diagram of Fig. 6;
Fig. 8 is the mounting plate bottom corrosion resistant plate structural representation of initiatively pusher;
Fig. 9 is the vertical view of passive pusher;
Figure 10 is the C-C cross section cut-away view of Fig. 9;
Figure 11 is the D part enlarged diagram of Figure 10;
Figure 12 withstands on layout plan on the Dun Ding for initiatively pusher or passive pusher and the beam that rises and falls with hydraulic jack;
Figure 13 withstands on cross section arrangement diagram on the Dun Ding for initiatively pusher or passive pusher and the beam that rises and falls with hydraulic jack.
The specific embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
What label 1-21 indicated among the accompanying drawing 1-13 is: bolt 9, bottom plate 10, base plate 11, H shaped steel tank tower 12, key seat 13, supporting plate 14, chute 15, rib 16, underboarding 17, web 18, the beam that rises and falls hydraulic jack 19, active pusher or passive pusher 20, steel pad case 21 are regulated in slide plate 1, the cross-section bottom surface 2 of steel case beam, canvas filler rubber plate 3, mounting plate 4, pushing tow power set 5, corrosion resistant plate 6, polyfluortetraethylene plate 7, " U " type slideway 8, location.
The present invention is directed to the vertical shift of large-tonnage steel case beam, propose a kind of thrusting slip method of setting up, adopt the active pusher of design or passive pusher to finish the bridge erection construction of striding the continuous all kinds of steel in footpath-mixed structure greatly with the hydraulic jack coordinating operation with the beam that rises and falls.During construction, at first arrange leveling steel pad case, obtain burnishing surface, active pusher or passive pusher are installed on burnishing surface and are risen and fallen the beam hydraulic jack, and steel case beam is moved into bridge pier at each bridge pier Dun Ding; Start initiatively pusher then, drive the slippage forward of steel box girder body, treat that initiatively the piston stroke traveling of pusher finishes, the described beam hydraulic jack of rising and falling again simultaneously hoists, jack-up steel case beam, and initiatively pusher is returned to initial position, falls described hydraulic jack again; Repeat the initiatively piston stroke of pusher, mobile steel case beam moves ahead, make steel case beam arrive another bridge pier from a bridge pier, and the slideway of the passive pusher of on described another this bridge pier of bridge pier upper edge, installing or initiatively the chute of pusher continue to slide, until making steel case beam move in place.
In the inventive method, steel case beam adopts multi-point pushing, to reduce the suffered horizontal thrust of bridge pier at the vacant lot section assembling and by incremental launching positioning one by one.Its pushing tow power adopts double-act-ing hydraulic J-Horner and oil pump station push-and-pull to come and go sliding planker technology, provides power by hydraulic jack, can realize pace type pushing tow and speed-controllable stably.Thrustor has concurrently and slides and the dual-use function of pushing tow, and is simple and compact for structure, and makes full use of girder steel self rigidity and need not to be provided with interim slideway and support.Its hydraulic pushing, lifting principle as shown in Figure 1 and Figure 2, during hydraulic pushing, two cover hydraulic systems respectively synchronous push one slide-plates 1 are slided, and contact the cross-section bottom surface 2 of steel case beam during hydraulic lifting, jacking steel case beam.The slippage contact friction face of plate type hydraulic thrustor adopts the polyfluortetraethylene plate friction material, effectively reduces the pushing tow resistance, and shuffle effect is good.
The hydraulic pushing device that the inventive method adopts is divided into initiatively and passive two kinds: active pusher band jack, passive pusher is established chute, sees Fig. 1, active pusher shown in Figure 2 and the structural representation of passive pusher.The inventive method is set up in the thrusting slip process steel case beam, is provided with an initiatively pusher at least, moves beam power to provide.Preferred initiatively pusher and several passive pusher combinations, structure is simpler, reasonable, needn't consider the harmonious problem of a plurality of power etc.
Fig. 3 is the structural representation of active pusher.As shown in Figure 3, initiatively pusher mainly is made up of mounting plate 4, corrosion resistant plate 6, polyfluortetraethylene plate 7, bottom plate 10 and pushing tow power set 5.Carrying steel case beam on the mounting plate 4, thereby mounting plate 4 upper surfaces are provided with canvas filler rubber plate 3.Bottom plate 10 upper surfaces are provided with " U " type slideway 8, and polyfluortetraethylene plate 7 is installed on " U " type slideway 8.The corrosion resistant plate 6 that mounting plate 4 bottoms welding shape and " U " type slideway 8 shapes match, as shown in Figure 8.Pushing tow power set 5 promote mounting plate 4 back and forth sliding motion on " U " type slideway 8.Wherein, pushing tow power set 5 are the hydraulic jack jack.The non-shiny surface of polyfluortetraethylene plate 7 and " U " type slideway 8 fit fixing, and the corrosion resistant plate 6 of shiny surface and mounting plate 4 bottoms produces sliding frictions.On bottom plate 10, be provided with the location and regulate bolt 9 corresponding to polyfluortetraethylene plate 7 installed positions, regulate bolt 9 to apply certain top power by rotating this, can make and to rectify a deviation when directive wheel is advanced near the girder steel lower rim, to regulate the shift position deviation of steel case beam.
Initiatively the main gliding material of pusher is the combination of bridge rubber freely movable bearing tetrafluoro plate and corrosion resistant plate.Friction factor between polyfluortetraethylene plate and the corrosion resistant plate is generally 0.04～0.06, and confficient of static friction is more bigger than the coefficient of kinetic friction.
Fig. 4, Fig. 5 are respectively the vertical view and the A-A face schematic diagrames of initiatively pusher mounting plate, and Fig. 6, Fig. 7 are the vertical view and the B-B face schematic diagram of initiatively pusher bottom plate.From Fig. 4-Fig. 7 as seen, upper and lower carriage structure master material is selected H shaped steel for use, mainly is made of the H shaped steel tank tower 12 that welds on base plate 11 and the base plate.The H sectional shape has bigger modulus of section, light unit weight, the loaded down with trivial details welding of steel work plate forming and the workload that distortion is proofreaied and correct have been saved, can guarantee the girder steel that sets up of success at the construction field (site) for this reason, choose from design and Fabrication parameter, raw-material selection and manufacture craft etc. have all been considered the life requirement of device.
Fig. 9-Figure 11 is respectively vertical view, C-C cross section cut-away view and the D part enlarged diagram of passive pusher.As seen from the figure, passive pusher mainly is made up of with corrosion resistant plate 6 supporting plate 14, polyfluortetraethylene plate 7, and corrosion resistant plate 6 covers and is installed on supporting plate 14 upper surfaces, constitutes chute 15, and corrosion resistant plate 6 upper surfaces are pasted with polyfluortetraethylene plate 7.Wherein, chute 15 both sides are provided with rib 16, are provided with underboarding 17 between supporting plate 14 and the corrosion resistant plate 6, and polyfluortetraethylene plate 7 shiny surfaces and corrosion resistant plate 6 fit.Same, supporting plate 14 also mainly is made of the H shaped steel tank tower 12 of base plate 11 with the welding of base plate top.
Adopt the inventive method vertical shift bridge that upper and lower slideway can be set, thereby save a large amount of track equipment and labour.Apparatus structure is simple, does not have impulse inertia by hydraulic pushing.In the present embodiment, pushing tow vertical shift speed can be set in per minute 0.3～1.0m scope as required.
In the present embodiment, use the inventive method before the vertical shift construction of steel case beam, calculated pushing tow power and corresponding configuration thrustor in advance.Following table is an active pusher parameter list in the present embodiment:
| Maximum jacking force | 60T | Oil top line journey | 1.5m |
| Pushing tow speed | 0.3m～1m/min | Appearance and size | 0.55m×1.2m×3.6m |
| Operating pressure | Maximum 31.5MPa | Hydraulic flow | Maximum 40L/min (variable pump) |
According to last chart table data, add required mobile steel case beam weight G1=520t in the present embodiment, get safety factor 1.5, confficient of static friction 0.07.Draw pushing tow gross weight G2=520 * 1.5 * 0.07=54.6t, jacking force F=60 * 2=120t(adopts 2 initiatively thrustors), F=120t〉54.6t, so meet the demands.Therefore in the present embodiment, guaranteeing under the security reliability, pushing up the beam that rises and falls of four 200t of uniform configuration with hydraulic jack 19 and two initiatively pusher or passive pusher 20, as shown in Figure 12 and Figure 13 at each pier.
During construction, at first arrange leveling steel pad case 21, obtain burnishing surface at each bridge pier Dun Ding.Pusher or passive pusher 20 and the beam that rises and falls are installed initiatively as shown in Figure 12 and Figure 13 with hydraulic jack 19 on the burnishing surface of pier top, initiatively pusher or passive pusher 20 and hydraulic jack 19 of two groups of symmetric arrangement at least on each Dun Ding.Then, will move on first bridge pier top at the good steel case beam of the initial assembly unit in bank.Start two active pushers on first bridge pier top synchronously, drive the slippage forward of steel box girder body, treat that initiatively the piston stroke traveling of pusher finishes, after being the relative bottom plate slippage of the mounting plate 1.5m of active pusher in the present embodiment, rise simultaneously and rise four beam hydraulic jack that fall, jack-up steel case beam, and with two initiatively pushers be returned to initial piston position.Fall described hydraulic jack again; Repeat the initiatively piston stroke of pusher, each stroke 1.5m that moves ahead.In this process, owing to made full use of steel case beam self rigidity, thereby and need not to be provided with interim slideway supporting.
Same initiatively pusher or passive pusher and the beam hydraulic jack of rising and falling of installing on ensuing bridge pier top, adopt passive pusher to get final product this moment.After initiatively pusher drive steel case back went out a segment distance, steel case beam can carry out assembly unit accordingly again, and section assembling like this is pushing tow one by one, arrive second the 3rd Dun Ding, in place until at last steel case beam being moved, finish the top lifting and the Luo Liang of girder steel, i.e. construction is finished.
Because steel case beam is a section assembling pushing tow one by one, so initiatively thrustor and passive thrustor are adjusted flexibly along with the carrying out of pushing tow sections can do the relevant position in the pushing tow process, it is convenient required to satisfy incremental launching construction, promptly when the described beam that rises and falls that hoists is used hydraulic jack, passive pusher or active pusher can unload from the bridge pier Dun Ding of its installation site, and are installed on other bridge pier Dun Ding.Also can adopt a plurality of active pushers, multi-point pushing is adopted in the synchronous push construction, reduces the suffered horizontal thrust of bridge pier.Simultaneously, in moving the beam work progress, the transit that observation steel case beam center line changes is set on the bridge center line of pier top, in moving the beam process, in time passes through to observe described transit to correct the skew of beam body midline position.
Adopt the inventive method vertical shift bridge that upper and lower slideway can be set, thereby save a large amount of track equipment and labour.Apparatus structure is simple, does not have impulse inertia by hydraulic pushing.Than dilatory than original position segmented assembly and laying slideway, adopting slide type hydraulic pushing device to set up the Steel Continuous Box beam makes full use of girder steel self rigidity and need not to be provided with interim slideway supporting, can save great amount of manpower and material resources, labour intensity is low, safety assurance good, workable, do not influence the normal colleague in river course, created good economic benefit and social benefit.
Claims (8)
1. the thrusting slip method of setting up of a steel case beam, behind the platform of bridge y direction, segmented consolidation shed is set, segmented jointing steel box beam beam body, then with beam thrusting slip forward piecemeal, beam falls after in place, change formal bearing, it is characterized in that this method is at each bridge pier Dun Ding or be furnished with the beam that rises and falls with hydraulic jack and passive pusher, perhaps be furnished with the beam that rises and falls hydraulic jack and active pusher, wherein has a bridge pier Dun Ding to be furnished with to rise and fall beam at least with hydraulic jack and pusher initiatively, move beam power to provide, described passive pusher comprises supporting plate, and described supporting plate is fixedly installed in bridge pier Dun Ding, and its upper surface has chute; Described active pusher mainly is made up of mounting plate, bottom plate and pushing tow power set, and mounting plate is fixedly installed in bridge pier Dun Ding, and forming " U " type slideway between upper and lower supporting plate also can be along the relative motion of " U " type slideway; Described steel box girder body presses the mounting plate upper surface in described active pusher, by the steel box girder body slippage forward on pushing tow power set drive mounting plate and the mounting plate thereof, the piston stroke traveling for the treatment of described pushing tow power set finishes, the described beam hydraulic jack of rising and falling simultaneously hoists, jack-up steel case beam, and the pushing tow power set are returned to initial piston position, fall described hydraulic jack again, repeat the piston stroke of pushing tow power set, make steel case beam arrive another bridge pier from a bridge pier, and " U " type slideway of the active pusher of installing on described another this bridge pier of bridge pier upper edge or the chute of passive pusher continue to slide, until making steel case beam move in place.
2. the thrusting slip method of setting up of a kind of steel case beam according to claim 1 is characterized in that on " U " type slideway of described active pusher polyfluortetraethylene plate being installed, and described mounting plate bottom is installed with corrosion resistant plate.
3. the thrusting slip method of setting up of a kind of steel case beam according to claim 1, it is characterized in that being embedded with corrosion resistant plate on the chute of described passive pusher, described corrosion resistant plate upper surface is placed with polyfluortetraethylene plate, and polyfluortetraethylene plate can sliding motion in chute.
4. the thrusting slip method of setting up of a kind of steel case beam according to claim 1 is characterized in that the setting up in the thrusting slip process of steel case beam, is provided with an initiatively pusher at least.
5. the thrusting slip method of setting up of a kind of steel case beam according to claim 1 is characterized in that on each bridge pier Dun Ding that at least two of symmetric arrangement rise and fall beam with hydraulic jack and passive pusher or active pusher.
6. the thrusting slip method of setting up of a kind of steel case beam according to claim 1, it is characterized in that setting up in the thrusting slip process at steel case beam, when the described beam that rises and falls that hoists is used hydraulic jack, described passive pusher or active pusher can unload from the bridge pier Dun Ding of installation site, and are installed on other bridge pier Dun Ding.
7. the thrusting slip method of setting up of a kind of steel case beam according to claim 1, it is characterized in that arranging leveling steel pad case at each bridge pier Dun Ding earlier, obtain burnishing surface, the beam that rises and falls hydraulic jack and passive pusher or active pusher then are installed on described burnishing surface.
8. the thrusting slip method of setting up of a kind of steel case beam according to claim 1, it is characterized in that on the bridge center line of described bridge pier Dun Ding, being provided with the transit that observation steel case beam center line changes, in moving the beam process, pass through to observe described transit to correct the skew of beam body midline position.
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| CN201010547756A CN101967800B (en) | 2010-11-17 | 2010-11-17 | Erecting, pushing and sliding method of steel box beam |
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| CN201010547756A CN101967800B (en) | 2010-11-17 | 2010-11-17 | Erecting, pushing and sliding method of steel box beam |
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| CN101967800A CN101967800A (en) | 2011-02-09 |
| CN101967800B true CN101967800B (en) | 2011-11-30 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699997B (en) * | 2012-06-08 | 2014-07-09 | 中铁十九局集团第六工程有限公司 | Longitudinal post-tensioned prestressed beam moving system and method |
| CN110878532B (en) * | 2019-12-04 | 2021-12-07 | 成都轨道建设管理有限公司 | Subway box girder translation construction device and method |
| CN111827073B (en) * | 2020-07-29 | 2021-08-24 | 中铁十八局集团有限公司 | Pushing construction method for double-width steel box girder |
| CN113981826A (en) * | 2021-10-29 | 2022-01-28 | 中交武汉港湾工程设计研究院有限公司 | Pushing device and method suitable for large-span long-distance support-free pushing device |
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| CN2074320U (en) * | 1990-09-15 | 1991-04-03 | 柳州市建筑机械总厂 | Automatic continuous thruster for bridge construction |
| CN101200878A (en) * | 2007-12-28 | 2008-06-18 | 中铁四局集团第五工程有限公司 | Continuous girder frusta top segment precisely locating apparatus and precisely locating construction technique thereof |
| JP4355240B2 (en) * | 2004-03-18 | 2009-10-28 | 大成建設株式会社 | PC box girder extrusion construction method |
| CN101736699A (en) * | 2009-12-15 | 2010-06-16 | 中交路桥华北工程有限公司 | Accurate positioning method of sliding of full-support frame steel box girder |
| CN101761032A (en) * | 2009-12-31 | 2010-06-30 | 上海海珀联动力技术有限公司 | Jack-in erection equipment for bridge |
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2010
- 2010-11-17 CN CN201010547756A patent/CN101967800B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2074320U (en) * | 1990-09-15 | 1991-04-03 | 柳州市建筑机械总厂 | Automatic continuous thruster for bridge construction |
| JP4355240B2 (en) * | 2004-03-18 | 2009-10-28 | 大成建設株式会社 | PC box girder extrusion construction method |
| CN101200878A (en) * | 2007-12-28 | 2008-06-18 | 中铁四局集团第五工程有限公司 | Continuous girder frusta top segment precisely locating apparatus and precisely locating construction technique thereof |
| CN101736699A (en) * | 2009-12-15 | 2010-06-16 | 中交路桥华北工程有限公司 | Accurate positioning method of sliding of full-support frame steel box girder |
| CN101761032A (en) * | 2009-12-31 | 2010-06-30 | 上海海珀联动力技术有限公司 | Jack-in erection equipment for bridge |
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