CN109629425A - The construction method on pole bracket and the composite steel concrete bridge concrete edge of a wing using pole bracket - Google Patents
The construction method on pole bracket and the composite steel concrete bridge concrete edge of a wing using pole bracket Download PDFInfo
- Publication number
- CN109629425A CN109629425A CN201811489002.6A CN201811489002A CN109629425A CN 109629425 A CN109629425 A CN 109629425A CN 201811489002 A CN201811489002 A CN 201811489002A CN 109629425 A CN109629425 A CN 109629425A
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- Prior art keywords
- steel
- pole bracket
- bracket
- limiter
- bolt
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
Abstract
A kind of construction method on the composite steel concrete bridge concrete edge of a wing the present invention provides removable pole bracket and using pole bracket.The pole bracket includes: steel bracket, bolt, round steel bar, billet and rotary limit device；The shape of steel bracket is obtuse triangle, and obtuse angle end is provided with connecting plate；Acute ends are provided with steel bushing；One end of round steel bar is fixedly connected with billet, and the other end passes through steel bushing；Billet is abutted with steel beam web plate；Rotary limit device includes first limiter and second limiter；Internal screw thread corresponding with the external screw thread on round steel bar is provided in first limiter and second limiter；First limiter and second limiter pass through external screw thread and inner screw sheath is located on the round steel bar, and are located at the both ends of steel bushing, and steel bushing is fixed on the round steel bar.The Fast Installation and disassembly of pole bracket may be implemented using the present invention, improve speed of application, save use cost, and to structure without destruction.
Description
Technical field
This application involves building structure technology fields, more particularly to one kind to be used for the composite steel concrete bridge concrete edge of a wing
The construction method on the pole bracket of construction and the composite steel concrete bridge concrete edge of a wing using pole bracket.
Background technique
Composite steel concrete bridge refers to be connect integral and considers with concrete slab by girder steel by shear connector
The bridge structure form of common stress.Compared to steel structural bridge, composite bridge is small with steel using amount, rigidity is big, Compression Stability is good
The advantages that, compared to concrete bridge, composite bridge has many advantages, such as that structure height is low, small, the applicable span of self weight is big, ductility is high.This
Outside, composite beam bridge is convenient for the factorial production using reasonable manufacture and working procedure, installation quality is high, operating expenses is low,
Speed of application is fast.
Composite bridge has obtained a large amount of application in China.When composite steel concrete bridge is constructed, the concrete edge of a wing
Plate is poured to control action from the duration.Pass through superimposed sheet bridge floor plate technique (Nie Jianguo, Liu Ming, the flat steel-concrete group of blade row
Conjunction structure [M] China Construction Industry Press, 2005), concrete slab partial precast is become into superimposed sheet, as coagulation
Template when soil pours, integral common stress after rear pouring concrete solidification, eliminates full cast-in-place concrete floorings
Template erection problem, greatly improve speed of application.
However, concrete slab cantilever flange portions, pour at present in also need using pole bracket mold method, and it is outstanding
The installation of arm support mostly uses welding, needs to cut bolt, connecting plate etc. when dismantling, easily causes destruction to structure,
It is beautiful to influence structure, speed of application is slow.
Summary of the invention
In view of this, being mixed the present invention provides a kind of pole bracket and using the composite steel concrete bridge of pole bracket
The construction method on the solidifying soil edge of a wing improves speed of application so as to realize the Fast Installation and disassembly of pole bracket, saves and uses
Cost, and to structure without destruction.
Technical solution of the present invention is specifically achieved in that
A kind of removable pole bracket for the construction of the composite steel concrete bridge concrete edge of a wing, the removable cantilever branch
Frame includes: steel bracket, bolt, round steel bar, billet and rotary limit device；
The shape of the steel bracket is obtuse triangle；The obtuse angle end of the steel bracket is provided with connecting plate；The connection
The bolt hole for passing through for bolt is provided on plate；
One acute ends of the steel bracket are provided with steel bushing；
One end of the round steel bar is fixedly connected with the billet；The billet is abutted with steel beam web plate；The circle
The other end of steel pole passes through the steel bushing；External screw thread is provided on the round steel bar；
The rotary limit device includes first limiter and second limiter；The first limiter and second limiter
In be provided with internal screw thread corresponding with the external screw thread on the round steel bar；
The first limiter and second limiter pass through the external screw thread and inner screw sheath is located on the round steel bar,
And the both ends of the steel bushing are located at, the steel bushing is fixed on the round steel bar.
Preferably, the bolt is dismountable hex bolts.
Preferably, the steel bushing and the steel bracket are integrally formed.
Preferably, the steel bracket is welded using fashioned iron or round steel pipe.
Preferably, the removable pole bracket further include: washer；
The washer is arranged between the bolt and the bottom of girder steel top flange sponson.
The present invention also provides a kind of constructions on composite steel concrete bridge concrete edge of a wing using above-mentioned pole bracket
Method, this method comprises the following steps:
Required pole bracket is selected according to demand；
According to the thickness of the stress size of selected pole bracket and girder steel top flange, the ruler of used bolt is determined
Very little and quantity；
Threaded hole is opened up on the girder steel top flange sponson on the composite steel concrete bridge concrete edge of a wing；
Bolt is passed through into the threaded hole on connecting plate and the threaded hole on girder steel top flange, the top of pole bracket is consolidated
Due to the bottom of girder steel top flange, and by the position of rotary limit device adjusting round steel bar, so that billet and girder steel upper limb
Steel beam web plate under edge sponson is held out against, and steel bushing is fixed on round steel bar；
It installs and is poured with cushion block and template on pole bracket；Then continue that prefabricated superimposed sheet is installed if it is superimposed sheet；
Carry out pouring for concrete slab cantilever part；
After concrete setting, back-out bolt, removes pole bracket；
To the safeguard procedures for carrying out the later period at the threaded hole on girder steel top flange.
As above as it can be seen that in the present invention for the composite steel concrete bridge concrete edge of a wing construction removable cantilever branch
In frame, due to having used the bracing members of detachable bolt and contact as the mode that is connected and fixed, above-mentioned pole bracket
Top is to be bolted, and the billet of lower part is only abutted with steel beam web plate, and is not to be fixedly connected with steel beam web plate,
Therefore it is fixed by the bolt on top and the positioning of the rotary limit device of lower part can be realized and be quickly installed, in installation process not
It needs to weld, and it is small to bolt workload；And after concreting is completed, only bolt need to directly be back-outed, avoid
Traditional pole bracket process to be cut when dismantling, may be implemented fast quick-detach, so as to greatly improve speed of application.Separately
Outside, after being disassembled, all components can be repeatedly utilized so that entire pole bracket, thus can be effectively saved use at
This, increases economic efficiency.In addition, the entire disassembly process of the above-mentioned pole bracket in the present invention is without welding and cuts, to knot
Structure is without destruction, therefore the influence to original structure is small, and the influence to ambient enviroment is small, and convenient beauty meets the requirement of green construction.
In addition, the stress of the pole bracket in the present invention is clear, force path is clear, and power transmission is reliable, convenient for calculating and designing, can apply
In the composite structure of any section form with the overhanging edge of a wing of girder steel.
Detailed description of the invention
Fig. 1 is the removable cantilever branch for the construction of the composite steel concrete bridge concrete edge of a wing in the embodiment of the present invention
Frame uses schematic diagram (the cantilever edge of a wing is all cast-in-place).
Fig. 2 is the removable cantilever branch for the construction of the composite steel concrete bridge concrete edge of a wing in the embodiment of the present invention
Frame uses schematic diagram (the cantilever edge of a wing uses superimposed sheet, and part is cast-in-place).
Fig. 3 is the removable cantilever branch for the construction of the composite steel concrete bridge concrete edge of a wing in the embodiment of the present invention
The side view of frame.
Fig. 4 is the structural schematic diagram of the steel bracket in the embodiment of the present invention.
Fig. 5 be the embodiment of the present invention in round steel bar, billet and rotary limit device structural schematic diagram.
Fig. 6 is the removable cantilever branch for the construction of the composite steel concrete bridge concrete edge of a wing in the embodiment of the present invention
The stress sketch of frame.
Fig. 7 is the flow diagram of the construction method on the composite steel concrete bridge concrete edge of a wing in the embodiment of the present invention.
Specific embodiment
For technical solution of the present invention and advantage is more clearly understood, below in conjunction with drawings and the specific embodiments, to this
Invention is described in further detail.
As shown in fig. 1~fig. 5, in the embodiment of the present invention for the composite steel concrete bridge concrete edge of a wing construction can
Dismounting pole bracket includes: steel bracket 11, bolt 12, round steel bar 13, billet 14 and rotary limit device 15；
The shape of the steel bracket 11 is obtuse triangle；The obtuse angle end of the steel bracket 11 is provided with connecting plate 16；Institute
State the bolt hole 17 being provided on connecting plate 16 for passing through for bolt 12；
One acute ends of the steel bracket 11 are provided with steel bushing 18；
One end of the round steel bar 13 is fixedly connected with the billet 14；The billet 14 is supported with steel beam web plate 10
It connects；The other end of the round steel bar 13 passes through the steel bushing 18；External screw thread 31 is provided on the round steel bar 13；
The rotary limit device 15 includes first limiter 51 and second limiter 52；The first limiter 51 and
Internal screw thread 53 corresponding with the external screw thread 31 on the round steel bar 13 is provided in two limiters 52；
The first limiter 51 and second limiter 52 are set in by the external screw thread 31 and internal screw thread 53 described
On round steel bar 13, and the both ends of the steel bushing 18 are located at, the steel bushing 18 is fixed on the round steel bar 13.
It, can be first outside the girder steel top flange on the composite steel concrete bridge concrete edge of a wing when stating pole bracket in use
Threaded hole 20 is opened up in extending portion point, it is then that the threaded hole 20 and the threaded hole 17 on the connecting plate 16 at steel bracket obtuse angle end is right
Together, then by bolt 12 it is each passed through threaded hole 17 and above-mentioned threaded hole 20, is tightened with tool, thus by the top of above-mentioned pole bracket
Portion is fixed on the bottom of girder steel top flange sponson.Then, by rotation first limiter and second limiter, round steel is adjusted
The position of bar, so that billet is held out against with the steel beam web plate under the sponson of girder steel top flange；It adjusts and then twists in position
Tight first limiter and second limiter, the steel bushing is fixed on the round steel bar.
In addition, preferably, in one particular embodiment of the present invention, the bolt is dismountable hex bolts.
In addition, preferably, in one particular embodiment of the present invention, the steel bushing and the steel bracket are integrated into
Type.Certainly, in another specific embodiment, the steel bushing can also be directly welded to the acute ends of the steel bracket
On.
In addition, preferably, in one particular embodiment of the present invention, the steel bracket is using fashioned iron or round steel pipe
It is welded.
In addition, preferably, in one particular embodiment of the present invention, the pole bracket further include: washer 19；It is described
Washer 19 is arranged between the bolt 12 and the bottom of girder steel top flange sponson.
In the inventive solutions, the top of above-mentioned pole bracket is solid by bolt and girder steel top flange sponson
It is fixed, it is provided vertically and lateral support for steel bracket, and the billet of pole bracket lower part is then abutted with steel beam web plate, for cantilever
Bracket provides lateral support.Therefore, the gravity of cantilever water-bearing concreae is the bolt by being fixed on girder steel top flange and support
In billet and round steel bar shared on steel beam web plate.
In addition, since the shape of the steel bracket of the pole bracket in the present invention is obtuse triangle, so that the steel branch
Its Compression Stability is improved so as to shorten the bearing length of round steel bar relatively close to the direction of steel beam web plate in the lower end of frame.
Due to being to be bolted, and the billet of lower part is only abutted with steel beam web plate at the top of above-mentioned pole bracket,
It and is not to be fixedly connected with steel beam web plate, therefore fixed by the bolt on top and the positioning of the rotary limit device of lower part
Realization is quickly installed, and does not need to weld in installation process, and it is small to bolt workload；And after concreting is completed, only
Bolt need to directly be back-outed, avoid process to be cut when the disassembly of traditional pole bracket, fast quick-detach may be implemented,
So as to greatly improve speed of application.In addition, entire pole bracket, after being disassembled, all components are repeatable sharp
With, therefore it can be effectively saved use cost, it increases economic efficiency.In addition, above-mentioned pole bracket in the present invention is entire
Disassembly process welding, without cutting, therefore the influence to original structure is small, and the influence to ambient enviroment is small, meets green construction
It is required that.In addition, the stress of the pole bracket in the present invention is clear, force path is clear, and power transmission is reliable, convenient for calculating and designing.
Fig. 6 is the removable cantilever branch for the construction of the composite steel concrete bridge concrete edge of a wing in the embodiment of the present invention
The stress sketch of frame.It assume that and be provided with multiple above-mentioned pole brackets on the sponson of girder steel top flange, and set girder steel
The length of top flange sponson is 1.5m, and thickness is uniformly 0.3m, and the space D between two neighboring pole bracket is 2.0m,
The high H of pole bracket is 0.5m, and girder steel uses Q345 steel, and top flange thickness 20mm, concrete density 25kN/m3 then have:
Act on resultant force G=1.5 × 0.3 × 2.0 × 25=22.5kN of gravity on pole bracket；
The vertical directed force F being subject at bolt1y=G=22.5kN；
The distance between the gravity point of water-bearing concreae and bolt L=0.75m；
The horizontal applied force F being subject at bolt1x=F2=GL/H=33.8kN.
Wherein, F2For lateral support provided by round steel bar.
If girder steel top flange thickness is 20mm, the maximum gauge of threaded hole is 20mm, and material is calculated according to Q345.
The load is smaller, and using plain bolt M24, Q345 material, plain nut uses 4.6 materials, and tensile bearing capacity guarantees
Load is 79.4kN (" GBT3098.1-2000 fastener mechanical performance bolt, screw and stud "), and shear-carrying capacity guarantees
Load are as follows:
225/31/2×π×122/ 1000=58.8kN,
The nut of M24 bolt is with a thickness of 21.5mm (" GB/T6170-2000 hex nut "), and bearing capacity is according to 20/
21.5=93.0% reduction, guarantee load after reduction are 73.8kN and 54.7kN, 22.5/73.8+33.8/54.7=0.92 <
1.0, meet design requirement.In the inventive solutions, the size of steel bracket constructs use by and can meet the requirements.
Big bracket spacing (for example, 5m) is such as used, then can increase the Number of Bolts (for example, using 2 bolts) at top to reach design
It is required that.
In addition, in the inventive solutions, it is also proposed that a kind of steel-concrete combination using above-mentioned pole bracket
The construction method on the bridge concrete edge of a wing.
Fig. 7 is the flow diagram of the construction method on the composite steel concrete bridge concrete edge of a wing in the embodiment of the present invention.
As shown in fig. 7, in the inventive solutions, the construction method on the composite steel concrete bridge concrete edge of a wing includes such as
Lower step:
Step 71, required pole bracket is selected according to demand.
In the inventive solutions, can be according to the specific requirements of Practical Project, the cantilever branch that is used needed for selection
The size and spacing of frame.Required pole bracket can be directly made according to demand, and existing can be used directly also can be used
Pole bracket.
Step 72, according to the thickness of the stress size of selected pole bracket and girder steel top flange, determine used in
The size and quantity of bolt.
In the inventive solutions, under normal circumstances, using common bolt.
In addition, stress sketch according to figure 6, have formula below to set up:
G=F1y, F1x=F2, GL=F1xH；
Therefore, in of the invention one preferable specific embodiment, can also be made according to above-mentioned formula to determine
The size and quantity of bolt.
Step 73, threaded hole is opened up on the girder steel top flange sponson on the composite steel concrete bridge concrete edge of a wing.
It in the inventive solutions, can be according to the practical application scene of engineering (for example, structure is all cast-in-place goes back
It is that part is cast-in-place etc.), select a suitable position (for example, having corresponding construction to grasp on the sponson of girder steel top flange
Make space, do not interfered with each other with other structures part), then screw thread is opened up in girder steel top flange on selected position
Hole.Under normal circumstances, it can open up along girder steel top flange through thickness through threaded hole.
Step 74, bolt is passed through into the threaded hole on connecting plate and the threaded hole on girder steel top flange, by pole bracket
Top be fixed on the bottom of girder steel top flange, and the position of round steel bar is adjusted by rotary limit device so that billet with
Steel beam web plate under the sponson of girder steel top flange is held out against, and steel bushing is fixed on round steel bar.
In the inventive solutions, threaded hole 20 can be aligned with threaded hole 17, then bolt is each passed through spiral shell
Pit 17 and above-mentioned threaded hole 20, are tightened with tool, thus overhanging by girder steel top flange is fixed at the top of above-mentioned pole bracket
Partial bottom；Then, it is rotated further by first limiter and second limiter, the position of round steel bar is adjusted, so that billet and steel
Steel beam web plate under the sponson of beam top flange is held out against；Adjust and then tighten first limiter and the second limit in position
The steel bushing is fixed on the round steel bar by device.
Step 75, it installs and is poured with cushion block and template on pole bracket；Then continue to install if it is superimposed sheet prefabricated folded
Plywood.
Step 76, pouring for concrete slab cantilever part is carried out.
Step 77, after concrete setting, back-out bolt, remove pole bracket.
Step 78, to the safeguard procedures for carrying out the later period at the threaded hole on girder steel top flange.
For example, in of the invention one preferable specific embodiment, can at the threaded hole on girder steel top flange into
The safeguard procedures such as row later period coating.
Through the above steps 71~78, the construction on the composite steel concrete bridge concrete edge of a wing can be completed.
In conclusion in the inventive solutions, due to the pole bracket using detachable bolt with connect
The bracing members of touch are to be bolted at the top of above-mentioned pole bracket as mode is connected and fixed, and the billet of lower part
It is only abutted with steel beam web plate, and is not to be fixedly connected with steel beam web plate, therefore fixed by the bolt on top and the rotation of lower part
Turning limiting device positioning can be realized and be quickly installed, and not need to weld in installation process, and it is small to bolt workload；And work as coagulation
After soil pours completion, only bolt need to directly be back-outed, avoid process to be cut when the disassembly of traditional pole bracket,
Fast quick-detach may be implemented, so as to greatly improve speed of application.In addition, entirely pole bracket is after being disassembled, institute
Some components can be repeatedly utilized so that, therefore can be effectively saved use cost, increase economic efficiency.In addition, in the present invention
For the entire disassembly process of above-mentioned pole bracket without welding and cutting, to structure without destruction, therefore the influence to original structure is small, right
The influence of ambient enviroment is small, and convenient beauty meets the requirement of green construction.In addition, the stress of the pole bracket in the present invention is bright
Really, force path is clear, and power transmission is reliable, convenient for calculating and designing, can be applied to any section shape with the overhanging edge of a wing of girder steel
The composite structure of formula.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (6)
1. a kind of removable pole bracket for the construction of the composite steel concrete bridge concrete edge of a wing, which is characterized in that this is removable
Filling pole bracket includes: steel bracket, bolt, round steel bar, billet and rotary limit device；
The shape of the steel bracket is obtuse triangle；The obtuse angle end of the steel bracket is provided with connecting plate；On the connecting plate
It is provided with the bolt hole for passing through for bolt；
One acute ends of the steel bracket are provided with steel bushing；
One end of the round steel bar is fixedly connected with the billet；The billet is abutted with steel beam web plate；The round steel bar
The other end pass through the steel bushing；External screw thread is provided on the round steel bar；
The rotary limit device includes first limiter and second limiter；It is set in the first limiter and second limiter
It is equipped with internal screw thread corresponding with the external screw thread on the round steel bar；
The first limiter and second limiter pass through the external screw thread and inner screw sheath is located on the round steel bar, and point
Not Wei Yu the steel bushing both ends, the steel bushing is fixed on the round steel bar.
2. removable pole bracket according to claim 1, it is characterised in that:
The bolt is dismountable hex bolts.
3. removable pole bracket according to claim 1, it is characterised in that:
The steel bushing and the steel bracket are integrally formed.
4. removable pole bracket according to claim 1, it is characterised in that:
The steel bracket is welded using fashioned iron or round steel pipe.
5. removable pole bracket according to claim 1, which is characterized in that the removable pole bracket further include:
Washer；
The washer is arranged between the bolt and the bottom of girder steel top flange sponson.
6. a kind of construction party on the composite steel concrete bridge concrete edge of a wing using the pole bracket as described in claim 1 to 5
Method, which is characterized in that this method comprises the following steps:
Required pole bracket is selected according to demand；
According to the thickness of the stress size of selected pole bracket and girder steel top flange, determine used in bolt size with
Quantity；
Threaded hole is opened up on the girder steel top flange sponson on the composite steel concrete bridge concrete edge of a wing；
Bolt is passed through into the threaded hole on connecting plate and the threaded hole on girder steel top flange, will be fixed at the top of pole bracket
The bottom of girder steel top flange, and by the position of rotary limit device adjusting round steel bar, so that outside billet and girder steel top flange
Steel beam web plate under extending portion point is held out against, and steel bushing is fixed on round steel bar；
It installs and is poured with cushion block and template on pole bracket；Then continue that prefabricated superimposed sheet is installed if it is superimposed sheet；
Carry out pouring for concrete slab cantilever part；
After concrete setting, back-out bolt, removes pole bracket；
To the safeguard procedures for carrying out the later period at the threaded hole on girder steel top flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811489002.6A CN109629425B (en) | 2018-12-06 | 2018-12-06 | Cantilever support and construction method of concrete flange of steel-concrete combined bridge using cantilever support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811489002.6A CN109629425B (en) | 2018-12-06 | 2018-12-06 | Cantilever support and construction method of concrete flange of steel-concrete combined bridge using cantilever support |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109629425A true CN109629425A (en) | 2019-04-16 |
| CN109629425B CN109629425B (en) | 2020-04-10 |
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ID=66071579
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811489002.6A Active CN109629425B (en) | 2018-12-06 | 2018-12-06 | Cantilever support and construction method of concrete flange of steel-concrete combined bridge using cantilever support |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201406639Y (en) * | 2009-05-20 | 2010-02-17 | 北京城乡建设集团有限责任公司 | Support of construction formworks of side flange plate of concrete-steel beam |
| JP5020163B2 (en) * | 2008-05-29 | 2012-09-05 | 日鐵住金建材株式会社 | Support for overhanging slab |
| CN103388310A (en) * | 2013-08-09 | 2013-11-13 | 北京市公路桥梁建设集团有限公司 | Single-point fixing adjustable cantilever tripod |
| CN108193599A (en) * | 2017-12-28 | 2018-06-22 | 中铁十局集团第四工程有限公司 | Concrete-steel Beam cast-in-place flange plate cantilevered support structure system and construction method |
-
2018
- 2018-12-06 CN CN201811489002.6A patent/CN109629425B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5020163B2 (en) * | 2008-05-29 | 2012-09-05 | 日鐵住金建材株式会社 | Support for overhanging slab |
| CN201406639Y (en) * | 2009-05-20 | 2010-02-17 | 北京城乡建设集团有限责任公司 | Support of construction formworks of side flange plate of concrete-steel beam |
| CN103388310A (en) * | 2013-08-09 | 2013-11-13 | 北京市公路桥梁建设集团有限公司 | Single-point fixing adjustable cantilever tripod |
| CN108193599A (en) * | 2017-12-28 | 2018-06-22 | 中铁十局集团第四工程有限公司 | Concrete-steel Beam cast-in-place flange plate cantilevered support structure system and construction method |
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| CN109629425B (en) | 2020-04-10 |
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