CN102121233A - Construction method of bridge cast-in-place box beam - Google Patents

Construction method of bridge cast-in-place box beam Download PDF

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Publication number
CN102121233A
CN102121233A CN 201110099837 CN201110099837A CN102121233A CN 102121233 A CN102121233 A CN 102121233A CN 201110099837 CN201110099837 CN 201110099837 CN 201110099837 A CN201110099837 A CN 201110099837A CN 102121233 A CN102121233 A CN 102121233A
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CN
China
Prior art keywords
cast
bridge
case
support
box girder
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CN 201110099837
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Chinese (zh)
Inventor
贾明浩
王海良
董鹏
吴冬
任权昌
黄立伟
杨新磊
刘晓蕊
孙锦镖
刘顺刚
刘岩
刘德章
倪泽飞
孙晓峰
高川
胡跃
钱林玉
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天津第三市政公路工程有限公司
天津城市建设学院
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Application filed by 天津第三市政公路工程有限公司, 天津城市建设学院 filed Critical 天津第三市政公路工程有限公司
Priority to CN 201110099837 priority Critical patent/CN102121233A/en
Publication of CN102121233A publication Critical patent/CN102121233A/en

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Abstract

The invention relates to a construction method of a bridge cast-in-place box beam, belonging to the technical field of bridge construction. The construction method of a bridge cast-in-place box beam is characterized in that components are isolated from a furnace heating element by using a metal material when the components are heated in a furnace mainly based on radiation heat transmission so that the components are subjected to thermal treatment under a uniform heating condition. The construction method is simple, easy to realize, scientific and reasonable in design, convenient in operation, practical and economic; the components are uniformly heated during thermal treatment; and the construction method has the advantages of excellent quality and wide application range, and can be used for effectively improving the performance of metal materials.

Description

A kind of bridge cast-in-situ box girder job practices
Technical field
The invention belongs to bridge manufacturing technology field, particularly relate to a kind of bridge cast-in-situ box girder job practices.
Background technology
At present, in municipal engineering, highway engineering, adopt the bridge construction form of cast-in-situ box girder more.Cast-in-situ box girder not only can adopt in main line bridge straightway scope, also can move towards along the line according to road, design idea pours into the ring road branch line than small curvature radius, so the scope of application is wider.But at the job practices disunity of cast-in-situ box girder, it is also unreasonable both not had standard, makes cast-in-situ box girder each operating mode in whole construction course exist bigger security risk, quality risk, causes because the accident that cast-in-situ box girder causes happens occasionally.Concerning cast-in-situ box girder construction manufacturing process, reduce the security risk in the work progress to greatest extent, guarantee that the safety of constructor under each operating mode, bridge itself becomes the important techniques problem.
Summary of the invention
The present invention provides a kind of bridge cast-in-situ box girder job practices for solving the technical problem that exists in the known technology.
The purpose of this invention is to provide a kind of have simple and easy to do, cost is low, be applicable to that the scale of construction is big, weight is big, and is swift to operate, economical and practical, the bridge cast-in-situ box girder job practices of characteristics such as efficiency of construction height.
The technical scheme that bridge cast-in-situ box girder job practices of the present invention is taked for the technical problem that exists in the solution known technology is:
A kind of bridge cast-in-situ box girder job practices is characterized in: job practices comprises that cast-in-situ box girder bottom ground is handled, the support and the concrete cast of case beam of the setting up of support, case side template; The ground processing is adopted dirt that ground is changed and is filled out; The support bottom adopts the lumps of wood to support, and support internal force is spread, and support arranges to, direction across bridge, short transverse along bridge, and support is provided with the two-layer lumps of wood between bottom the case beam and supports; Set shaped steel formwork is adopted in the support of case side template; The concrete cast of case beam adopts the technology of twice cast to construct.
Bridge cast-in-situ box girder job practices of the present invention can also be taked following technical scheme:
Described bridge cast-in-situ box girder job practices, be characterized in: ground handle to adopt dirt that ground is changed when filling out, adopting three step 37 lime earths that ground is changed fills out, per step thickness is 20-40cm, total processing thickness is 80-100cm, adopt plant equipment to carry out compacting, adopt original position bearing capacity of foundation soil checkout equipment to carry out bearing capacity and detect bearing capacity of foundation soil 250-500kPa.
Described bridge cast-in-situ box girder job practices is characterized in: the lumps of wood sectional dimension of support bottom is 15-25 * 15-24cm.
Described bridge cast-in-situ box girder job practices is characterized in: setting up of support adopts modularization, standardization to set up, and be vertical along bridge in the bridge pier both sides Arrangement pitch in the m scope is 0.4-0.8m, and L is for striding the footpath; Vertically other scopes are 1.0-1.4m; The arrangement pitch that direction across bridge case web reaches the both sides vertical rod down is 0.4-0.8m; Arrangement pitch is 0.7-1.1m under the web.
Described bridge cast-in-situ box girder job practices is characterized in: the plate thickness of the supporting and shaping steel form of case side template is 4-8mm, and the back cross rib is the 8# channel-section steel, and the short transverse spacing is 0.3-0.6m, adopts the 12# channel-section steel as vertical rib behind the cross rib.
Described bridge cast-in-situ box girder job practices is characterized in: the supporting and shaping steel form footing and the bridge floor position of case side template add split bolt, diameter of bolt Φ 10-Φ 14mm, spacing 0.6-1.2m.
Described bridge cast-in-situ box girder job practices is characterized in: add the sealing sponge strip between the supporting and shaping steel form seam of case side template.
Described bridge cast-in-situ box girder job practices is characterized in: when the supporting and shaping steel form of case side template uses, with sand paper and rag the rusty stain and the dust on set shaped steel formwork surface are handled totally earlier, smeared release agent then.
Described bridge cast-in-situ box girder job practices, be characterized in: the technology of twice cast that the concrete cast of case beam is adopted is, the scope of cast for the first time is case beam base plate and web, along the vertically from one end to the other side first fluid concrete base plate of bridge, return initial position fluid concrete web again, the cast of web highly is 0.3-0.7m, is from one end to the other side evenly to pour into a mould equally, finishes up to the web concrete cast; When pouring into a mould for the second time, by the time for the first time concrete intensity meet design requirement and constuction joint handled after carry out, top board is evenly cast equally from one end to the other side.
Advantage and good effect that the present invention has are:
Bridge cast-in-situ box girder job practices is owing to adopted brand-new technology scheme of the present invention, and compared with prior art, it is 90cm that the present invention adopts 37 lime earth that ground is handled the degree of depth, has guaranteed that bearing capacity of foundation soil satisfies construction requirement; The internal force of upper bracket diffuses on the foundation soil by the lumps of wood, has made full use of the potential bearing capacity of foundation soil; Support is set up vertical bridge and is arranged according to the requirement of present technique to, direction across bridge, short transverse, wet joint two ends, has saved the support requirement, has saved the time of setting up; The upper side template adopts self-balancing pull bar offset by the level of power, has reduced the construction risk of support; Concrete in two steps, per step layering is poured into a mould, and has reduced the uneven construction risk of support force.That the present invention has is simple and easy to do, time saving and energy saving, economic security, low cost and other advantages, is applicable to that the scale of construction is big, the construction manufacturing of the big cast-in-situ box girder of weight.
Description of drawings
Fig. 1 is that support of the present invention is set up vertical bridge to schematic diagram;
Fig. 2 is that support of the present invention is set up the direction across bridge schematic diagram;
Fig. 3 is a cast-in-situ box girder outboard template structural representation;
Fig. 4 is a cast-in-situ box girder support shuttering structural representation.
Among the figure, the 1-set shaped steel formwork, the vertical steel pipe bridging of 2-, the 3-rack rod, 4-support tringle, the 5-safety guide rail, 6-bowl button support, 7-bowl button support adjustable seats, 8-top is to pull bar, and the 9-below is to pull bar, the horizontal steel pipe bridging of 10-.
The specific embodiment
For further understanding technology contents of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
With reference to accompanying drawing 1 to Fig. 4.
Embodiment 1
A kind of cast-in-situ box girder job practices comprises the technology of setting up of cast-in-situ box girder bottom method for processing foundation and upper bracket.Adopt dirt that ground is handled, reach requirement for bearing capacity; The support bottom adopts the lumps of wood that support internal force is spread; Support is along the arrangement pitch of bridge to, direction across bridge, short transverse; The method to set up of the case beam bottom two layers lumps of wood; The supporting process of case side template; Concrete casting sequence of case beam and method.
Before the cast-in-situ box girder manufacturing construction, at first must handle the undisturbed soil ground, change and fill out the dirt that intensity is higher relatively, compressibilty is less relatively, dirt can adopt the allotment of pseudo-ginseng ratio, and layered rolling.Per step, grey soil thickness was 30cm, changed to fill out for three steps and amount to 90cm, changed to fill out and rolling the back that finishes the bearing capacity of foundation soil after handling is detected, and guaranteed that its bearing capacity is not less than 300kPa.
Place 18 * 18cm lumps of wood on foundation soil, the lumps of wood plays the effect of dispersive stress, lays bowl button rack rod on the lumps of wood, and vertical bridge is to encrypted section Arrangement pitch is 0.6m in the scope, and vertical bridge is 1.2m to non-encrypted section arrangement pitch; Vertical pole ' s span is 0.6m under the direction across bridge web, and arrangement pitch is 0.9m in the scope of direction across bridge case chamber; Short transverse cross bar spacing is 1.2m; And bridging is set along bridge horizontal stroke, vertical, horizontal direction, regulate the internal force between the vertical rod.
At first put direction across bridge 10 * 15cm die square on the support jacking, put on die square along the bridge little lumps of wood of 10 * 10cm longitudinally, little lumps of wood spacing is 30cm.Lay case beam bottom board plate on the little lumps of wood.
The case beam side installs employing to drawing mode, is provided with pull bar in the vertical rib bottom at two side template rear portions, and concrete lateral pressure is converted into internal force between the side template.
Adopt branch, placement layer by layer during concreting, the concrete height of cast is evenly increased.
Cast-in-situ bridge manufacturing construction specific implementation process:
1, ground is handled
Before cast-in-situ box girder bottom support body is set up, support system basis, job site must process be handled: remove surperficial miscellaneous fill before the construction, compaction in layers is 90 ㎝ three and is gone on foot 3:7 dirt, per step compacted depth 300mm, upper berth 50mm disintegrating slag stone, the every side of based process width is wideer 1~3 meter than case beam drop shadow spread.Adopt the in-situ test instrument that the bearing capacity of foundation soil after handling is tested.In order to increase lifting surface area, diffusion-induced stress improves the resistance to overturning of bearing capacity of foundation soil and reinforced support, and rack rod is transferred 18 * 18cm sleeper.
In order to eliminate the nonelastic deformation between Support joint and each member, before construction, the bowl button support of setting up to be carried out precompressed and handle, the sandstone material is adopted in precompressed, and the pressure on the unit area is identical with the pressure for the treatment of the pouring concrete generation.
2, support is set up
Box girder construction adopts all round victory support system, and box beam bracket requires to have enough rigidity, intensity and stability.Support is set up and is adopted WDJ bowl fastening type multifunction scaffold (Φ 48mm * 3.5mm), the general arrangement principle for vertical bridge to: vertical pole ' s span is encrypted to 0.6 meter in pier stud both sides L/5+1 rice (L is for the striding directly) scope, all the other span centre part vertical pole ' s spans are 1.2 meters, 1.2 meters of step pitches; Direction across bridge: vertical pole ' s span is 1.2 meters of 0.6 meters, step pitch under the web, all the other cornice and beam case chamber part below vertical pole ' s span adopt 1.2 meters of 0.9 meters, step pitch.
After bowl button stent support is finished, make bridging with scaffold tubes, strengthen the stability and the rigidity of support integral body, bridging and ground is at 45~60 ° of angles, bridging is connected with vertical rod with fastener and is linked to be a stress system each other, the bridging fastener must be connected with vertical rod, forbids to be connected with cross bar.Arrange continuously that along the vertical bridging of bridge middle vertical, horizontal is provided with vertical bridging the end of by continuously to the top, its spacing is 4.5m.Horizontal cross brace is provided with more than the adjustable collet in bottom together, is provided with below the adjustable jacking in top together, and the centre is provided with together every 4.8m, and the extension elongation of top jacking and bottom collet can not surpass 30cm.
3, cast-in-situ box girder is measured unwrapping wire
Below bracket leg is set at the bottom of the beam, begin the case beam is carried out levelling and unwrapping wire.At the bottom of the beam during unwrapping wire, the first step is emitted two side lines (at place, point of contact, beam base angle) at the bottom of the beam, and the unwrapping wire dot spacing is 5m 1 point.Lay the beam bottom board plate then, center line at the bottom of emitting beam on the bed die is checked two sidelines with center line.Elevation is checked and is adjusted at the bottom of the second stepping cross girders, and the template absolute altitude is elevation+camber+anticipated settlement at the bottom of the beam.The lifting side form, it is linear to adjust side form.The 3rd step checked for the elevation and the position of outer edge that the case beam is corniced, and then section width was checked.
Case beam camber is according to the drawing setting.Anticipated settlement is determined according to geological conditions, support height and empirical value, operated by rotary motion 2cm.At different situations, come to determine to reserve the numerical value of sedimentation during support as the case may be.
4, case beam steel colligation
Reinforcing bar all adopts slate pencil line colligation, guarantees that the laid reinforcement binding size is accurate.For guaranteeing the protective layer thickness of reinforcing bar, on every square metre of template scope, put a backing plate, on special-shaped template face, put two bed courses at least.Should reduce the reservation of process bar and pre-buried in the work progress as far as possible, the sum of errors corrosion of steel bar occur to prevent physical dimension.The position that process bar must be provided with at first should have the process bar working measure to do guidance.Also to handle preformed hole and pre-buried well during assembling reinforcement.For guaranteeing reinforcing bar planeness, accurate, the globality in position, case beam base plate reinforcing bar adopts terraced sheet to fix, terraced sheet spacing 1.2m, per 2 meters spot welding one places.One side welding fusion length 10d is all adopted in the ladder oblique cut grafting.The crosspoint of reinforcing bar is used iron wire and is tied, and in case of necessity, also available electric welding welds.The end of stirrup is crotch inwardly, and the interface point of stirrup corner and reinforcing bar all should tie.When the vertical reinforcement of case beam overlapped, the reinforcing bar crotch of corner should become 90 degree with template.When adopting spud vibrator to pour into a mould small-sized cross section post, the angle minimum of crotch and template must not must not be become flexible in the process of building less than 15 degree.The iron wire that colligation is used is wanted fall home, must not stretch in the topping.
5, presstressed reinforcing steel blanking and lashing
The abrasive cutoff saw cutting is adopted in the presstressed reinforcing steel blanking, must not adopt the gas welding cutting.Fix in case loose with the adhesive tape colligation in the cutting part both sides before the cutting.The steel strand cutting length is on the length of curve basis, duct of design, and the stretch-draw end increases 84cm, and non-stretch-draw end increases 20cm, and the steel strand that blanking finishes should in time be compiled bundle and be under lock and key.Each root steel wire should be parallel as far as possible when steel strand were compiled bundle, must not twine, and every 1.5m colligation is restrainted and held lm colligation at interval together together; It is straight that steel strand must keep each other, must not twist together mutually, to guarantee carrying out smoothly of stretch-draw.Plastic film capicitor is buried underground
Plastic film capicitor in strict accordance with design drawing length, highly, coordinate and curve element be pre-buried, the size in duct, the position should be accurate, the bellows line style is smooth-going must not obvious knuckle.Pipeline adopts spacer bars to fix, and 0.75 meter of straightway spacing, curved section spacing are 0.5 meter and suitably encrypt.The tube connector of pipe joint place adopts other similar pipeline of bigger diameter class, and length is 5 times of connected pipe diameter.Can not make the joint produce angle changes and take place pipeline when concreting rotation or displacement during connection, and wrap closely in the joint with waterproof adhesive plaster, prevent the infiltration of cement paste.All pipelines are established steam vent at peak, establish drain hole in minimum point when needing, and all adopt the plastic tube of diameter 2cm, and length should be enough to outside pipeline outlet box back plate.Piping laying finishes and the end should be built, and anti-sealing or other foreign material enter.
Should check before the steel strand lashing that steel strand surface does not have mechanical damage, harmful corrosion and greasy dirt.The lashing construction adopts artificial lashing method to carry out.Should clear up the duct before the lashing, inner no silt particle dirt, steel cord end to component inside lm distance, steel wire, steel strand surface do not have dirt dirt and floating rust, residual concrete and silt particle should be removed totally and can lashing construct in the loudspeaker mouth of pipe and in the slip casting pore.During steel strand lashing construction, should twine electric adhesive plaster end socket in advance in the steel strand end, putting length simultaneously is the steel pipe traction casing of 20 cm, utilization is passed the high tensile steel wire that comes from the bellows other end in advance and is carried out artificial lashing, application of force is even, continuous in the lashing process, in order to avoid puncture bellows in the lashing process; For reducing the frictional force in the lashing process, can suitably smear small amount of engine oil on the steel bushing surface.Simultaneously, the pre-buried steel backing plate of end should be perpendicular to the bellows core line, and the end convolution muscle should be tried one's best near billet.In addition, in concreting process, should be at interval steel wire bundle in the duct be back and forth twitched once in 30 minutes, prevent that spillage is fixed.
6, box-beam plate engineering
The cast-in-situ box girder bed die adopts bamboo offset plate, side form set shaped steel formwork.Bamboo offset plate size length at the bottom of the beam * wide: 1.22 * 2.44m, thick 1.2cm, the level butt joint requires piece tight between the bamboo offset plate, does not allow faulting of slab ends.The bamboo offset plate is the two-layer lumps of wood down: from top to bottom, the first floor lumps of wood is for along the bridge, and the lumps of wood is of a size of 10 * 10cm, spacing 30cm; Second layer lumps of wood direction across bridge is arranged, and the lumps of wood is of a size of 10 * 15cm, and its spacing is consistent with bowl arrangement along the bridge of formula fastener, and with the jacking close proximity of bowl formula fastener.
The case beam cornices and side form adopts set shaped steel formwork, and the steel form width outside is to cantilever end, and is inboard to circular arc point of contact, base angle.The set shaped steel formwork plate thickness is 6mm, and the back cross rib adopts the 8# channel-section steel, and the short transverse spacing is 0.4m, adopts the 12# channel-section steel as vertical rib behind the cross rib.Pressure to side form in the concreting process is bigger, in order to prevent box-beam plate sidesway, adds split bolt at template footing and bridge floor position respectively, diameter of bolt Φ 12mm, spacing 1m.Steel wood junction will be spliced closely, faulting of slab ends and slit mustn't occur.For preventing spillage, all add the sealing sponge strip between form joint.
The steel form release agent, is handled the rusty stain and the dust of template surface totally with sand paper and rag, and then is smeared release agent before the steel form swabbing with special-purpose form coating.The cast-in-situ box girder outboard template as shown in Figure 3.
The case beam adopts wooden monolithic internal mold, makes framework with 5 * 10cm lumps of wood, makes panel with the 2cm plank, does the monolithic internal mold, and the every joint length of internal mold is not more than 4m.The advantage of monolithic wood internal mold is that installation rate is fast, can shorten internal mold and install the time.
7, case beam concrete work
Case beam concrete adopts commercial concrete, adopts pumping mode to build.Adopt one-time-concreting according to designing requirement, establish manhole, be used for that underplate concrete is built and form removal at case back plate.
Build order and should build case beam base plate earlier from hanging down toward height, building to two 1 sections passing from an end, the pouring box web guarantees that the web height that each circulation is built is not more than 50cm again, and going into the mould concrete should be along ash under the bridge longitudinal axis symmetry.Concrete vibrating does not extremely emit bubble, the bleeding that has an even surface, and shakes but must not cross, in order to avoid cause that coarse fodder sinks in the concrete.

Claims (9)

1. bridge cast-in-situ box girder job practices is characterized in that: job practices comprises that cast-in-situ box girder bottom ground is handled, the support and the concrete cast of case beam of the setting up of support, case side template; The ground processing is adopted dirt that ground is changed and is filled out; The support bottom adopts the lumps of wood to support, and support internal force is spread, and support arranges to, direction across bridge, short transverse along bridge, and support is provided with the two-layer lumps of wood between bottom the case beam and supports; Set shaped steel formwork is adopted in the support of case side template; The concrete cast of case beam adopts the technology of twice cast to construct.
2. according to the described bridge cast-in-situ box girder of claim 1 job practices, it is characterized in that: ground handle to adopt dirt that ground is changed when filling out, adopting three step 37 lime earths that ground is changed fills out, per step thickness is 20-40cm, total processing thickness is 80-100cm, adopt plant equipment to carry out compacting, bearing capacity of foundation soil 250-500kPa.
3. according to the described bridge cast-in-situ box girder of claim 1 job practices, it is characterized in that: the lumps of wood sectional dimension of support bottom is 15-25 * 15-24cm.
4. according to claim 1 or 3 described bridge cast-in-situ box girder job practicess, it is characterized in that: setting up of support adopts modularization, standardization to set up, and be vertical along bridge in the bridge pier both sides Arrangement pitch in the m scope is 0.4-0.8m, and L is for striding the footpath; Vertically other scopes are 1.0-1.4m; The arrangement pitch that direction across bridge case web reaches the both sides vertical rod down is 0.4-0.8m; Arrangement pitch is 0.7-1.1m under the web.
5. according to the described bridge cast-in-situ box girder of claim 1 job practices, it is characterized in that: the plate thickness of the supporting and shaping steel form of case side template is 4-8mm, the back cross rib is the 8# channel-section steel, and the short transverse spacing is 0.3-0.6m, adopts the 12# channel-section steel as vertical rib behind the cross rib.
6. according to the described bridge cast-in-situ box girder of claim 1 job practices, it is characterized in that: the supporting and shaping steel form footing and the bridge floor position of case side template add split bolt, diameter of bolt Φ 10-Φ 14mm, spacing 0.6-1.2m.
7. according to claim 1,5 or 6 described bridge cast-in-situ box girder job practicess, it is characterized in that: add the sealing sponge strip between the supporting and shaping steel form seam of case side template.
8. according to claim 1,5 or 6 described bridge cast-in-situ box girder job practicess, it is characterized in that: when the supporting and shaping steel form of case side template uses, with sand paper and rag the rusty stain and the dust on set shaped steel formwork surface are handled totally earlier, smeared release agent then.
9. according to the described bridge cast-in-situ box girder of claim 1 job practices, it is characterized in that: the technology of twice cast that the concrete cast of case beam is adopted is, the scope of cast for the first time is case beam base plate and web, along the vertically from one end to the other side first fluid concrete base plate of bridge, return initial position fluid concrete web again, the cast of web highly is 0.3-0.7m, is from one end to the other side evenly to pour into a mould equally, finishes up to the web concrete cast; When pouring into a mould for the second time, by the time for the first time concrete intensity meet design requirement and constuction joint handled after carry out, top board is evenly cast equally from one end to the other side.
CN 201110099837 2011-04-20 2011-04-20 Construction method of bridge cast-in-place box beam CN102121233A (en)

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CN102425110A (en) * 2011-08-31 2012-04-25 重庆新科建设工程有限公司 Cast-in-situ concrete construction method for full section of urban overpass box girder
CN102995561A (en) * 2011-09-19 2013-03-27 曹新恒 Universal bridge cast-in-place support
CN102400440A (en) * 2011-11-14 2012-04-04 中铁十局集团有限公司 Outer template
CN103382702A (en) * 2013-07-11 2013-11-06 中国建筑第六工程局有限公司 Cast-in-situ box grider bracket and constructing method thereof
CN103382702B (en) * 2013-07-11 2016-03-30 中国建筑第六工程局有限公司 A kind of support of cast-in-situ box girder and building method thereof
CN104372890A (en) * 2014-11-07 2015-02-25 成龙建设集团有限公司 Construction method of bare concrete prefabricated box beam with complicated structure
CN105178596A (en) * 2015-10-10 2015-12-23 安徽卓良新材料有限公司 Cast-in-place box girder formwork diagonal bracing device
CN109423955A (en) * 2017-08-22 2019-03-05 天津九为实业有限公司 A kind of place support frame is taken by cross tears technique open
CN109306663A (en) * 2018-11-01 2019-02-05 江苏中路工程技术研究院有限公司 A kind of extremely frigid zones Full space support construction method
CN110468720A (en) * 2019-08-29 2019-11-19 中国十七冶集团有限公司 A kind of construction method of analyzing self-anchored suspension bridge girder integral type placement layer by layer

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