CN105064196B - The fish belly I-shaped combination of prestressing force steel reinforced concrete simply supported girder bridge and its construction method of precast assembly - Google Patents
The fish belly I-shaped combination of prestressing force steel reinforced concrete simply supported girder bridge and its construction method of precast assembly Download PDFInfo
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Abstract
The invention discloses a kind of I-shaped prestressing force steel reinforced concrete combination simply supported girder bridge of fish belly of precast assembly, using prefabricated fish belly plate-girder and precast concrete floorings, ladle concrete component is used in fish belly i-shaped beamses lower flange, the stretch-draw prestressing force in the concrete of lower flange ladle concrete component, this greatly improved the bending rigidity of girder steel, the compressive pre-stress for making into bridge deck concrete after bridge increases, the span ability of Beams is significantly increased, and the atmospheric exposure of deformed bar is avoided, the durability and unfailing performance of presstressed reinforcing steel greatly improved.Meanwhile, the steel reinforced concrete of structure combination simply supported girder bridge can be transported easily, prefabricated, assembly, be fully able to meet the requirement of factory-made component and live Fast Installation.Accordingly, inventor has also set up corresponding construction method, using the method construction safety, high-quality, convenient, fast.
Description
Technical field
The invention belongs to communications and transportation bridge engineeting field, more particularly to a kind of I-shaped prestressing force of the fish belly of precast assembly
Steel reinforced concrete combines simply supported girder bridge and its construction method.
Background technology
With the development of multilevel traffic infrastructure, in populated area, Urban Bridge construction or highway cross-line are applied
In man-hour, the problem of bridge structure work progress uninterrupted traffic under the conditions of heavy traffic is faced with, this is to working security requirement
High, construction period requirement is short, while also to take into account landscape and environmental requirement.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of component and facilitates the quick precast assembly of prefabricated, in-site installation
Fish belly I-shaped prestressing force steel reinforced concrete combination simply supported girder bridge and its construction method, to meet, multilevel traffic working security is high, the cycle
Requirement that is short, focusing on landscape and environmental protection.
In order to solve the above technical problems, the present invention uses following technical scheme：The I-shaped prestressing force of fish belly of precast assembly
Steel reinforced concrete combines simply supported girder bridge, using prefabricated fish belly plate-girder and precast concrete floorings, is used in fish belly i-shaped beamses lower flange
Ladle concrete component, the stretch-draw prestressing force in the concrete of lower flange ladle concrete component.
The ratio of rise to span of steel reinforced concrete combination simply supported girder bridge is controlled between 1/15-1/20, and lower flange fish belly line style is catenary
Or parabola.
The control of the ratio between the bearing depth of section and span centre maximum height of steel reinforced concrete combination simply supported girder bridge is between 1/2-2/3.
The I-shaped prestressing force steel reinforced concrete of fish belly of above-mentioned precast assembly combines the construction method of simply supported girder bridge, including following step
Suddenly：
<1>Precast concrete floorings and prefabricated fish belly i-shape steel beam in advance
During prefabricated fish belly i-shape steel beam, the lower flange ladle concrete component of welding processing prefabricated unit, using girder steel
Beam stand processed, by lower flange ladle concrete component, top flange plate, web, transverse stiffener, longitudinal stiffener, standoff region
Web, abutment member lower flange, bearing ribbed stiffener, bearing transverse stiffener, the vertical ribbed stiffener of bearing are welded into single beam fish belly
I-shaped prefabricated unit；Colligation ring-type stirrup constitutes steel reinforcement cage with cableway in the ladle concrete component of lower flange, sets
Bellows, bellows is through diaphragm plate with holes in the component of lower flange and passes through bearing, and lower flange wrapper sheet is welded afterwards；In lower flange
The oblique template of concrete is installed at place, pours lower flange ladle plate inner concrete, concrete curing；
<2>On-site hoisting
After concrete curing, by the I-shaped prefabricated unit transport of prefabricated fish belly is to job site and positions lifting；Multi-disc
Between the prefabricated I-shaped prefabricated unit of fish belly, it is connected with bearing open web type diaphragm plate using span centre open web type diaphragm plate；
<3>Stretch-draw prestressing force
After the completion of the wet joint concrete maintenance of concrete slab, prestressing force in the ladle concrete component of tensioning lower flange
Muscle, forms the I-shaped prestressing force steel reinforced concrete combination simply supported girder bridge of fish belly of precast assembly.
The lifting age of precast concrete floorings, concrete slab set floorings groove profile hole simultaneously more than 180 days
The reserved steel bar in groove profile hole, is connected by cast-in-place concrete top flange cluster type WELDING STUDS during lifting with reserved steel bar in groove profile hole
Connect.
The single I-shaped prefabricated unit of beam fish belly includes two panels fish belly steel I-beam, and two panels fish belly steel I-beam distance is work
Font girder span is medium-altitude 0.7-1.5 times.
Lower flange ladle concrete component base plate welds together with web along beam is elongated, in each transverse stiffener of web
Position bottom sets the diaphragm plate that punches, web, base plate and wrapper sheet inner surface the arrangement shearing in lower flange ladle concrete component
Nail, the concrete in the ladle concrete component of lower flange carries out cast-in-place again after the completion of whole I-beam prefabricated unit is prefabricated.
Concrete in the ladle concrete component of lower flange uses particulate continuous grading anti-crack concrete；The transverse direction of floorings
Wet seam uses rapid hardening slightly expanded concrete, longitudinal wet joint to use fast hardening concrete.
Web and roof and floor surface layout WELDING STUDS group near bearing；Cut using long and short two kinds the upper surface of top flange
Power follows closely arrangement, and short WELDING STUDS is even distribution type, and uniform short WELDING STUDS length is 5-10cm；WELDING STUDS long is cluster type, collection
Shu Shichang WELDING STUDSs length is 20-25cm.
Span centre open web type diaphragm plate is by span centre open web type diaphragm plate top boom, span centre open web type diaphragm plate lower boom, span centre
Open web type diaphragm plate is tiltedly constituted；Bearing open web type diaphragm plate is by bearing open web type diaphragm plate top boom, bearing open web type diaphragm plate
Lower boom, bearing open web type diaphragm plate are tiltedly constituted.
For meet multilevel traffic construction strict demand, inventor devise a kind of fish belly of precast assembly it is I-shaped it is pre- should
Power steel reinforced concrete combines simply supported girder bridge, using prefabricated fish belly plate-girder and precast concrete floorings, is adopted in fish belly i-shaped beamses lower flange
Ladle concrete component is used, the stretch-draw prestressing force in the concrete of lower flange ladle concrete component, this greatly improved girder steel
Bending rigidity, the compressive pre-stress for making into bridge deck concrete after bridge increases, and the span ability of Beams is significantly increased,
And the atmospheric exposure of deformed bar is avoided, the durability and unfailing performance of presstressed reinforcing steel greatly improved.Meanwhile, the structure
Steel reinforced concrete combination simply supported girder bridge can easily transport, prefabricated, assembly, be fully able to meet factory-made component with the quick peace in scene
The requirement of dress.Accordingly, inventor has also set up corresponding construction method, using the method construction safety, high-quality, convenient, fast.
Brief description of the drawings
Fig. 1 is that the I-shaped prestressing force steel reinforced concrete of fish belly of precast assembly of the present invention combines precast concrete bridge floor in simply supported girder bridge
The layout drawing of plate.
Fig. 2 is the layout drawing for reserving slotted eye and reinforcing bar in Fig. 1 prefabricated bridges on monolithic floorings.
Fig. 3 is bearing position arrangement facade detail drawing and abutment member schematic diagram.
Fig. 4 is the beam prefabricated unit sectional view of single fish belly i shaped cross section.
Fig. 5 is that the structural facades of the I-shaped prestressing force steel reinforced concrete combination simply supported girder bridge of fish belly of precast assembly of the present invention are illustrated
Figure.
Fig. 6 is the layout drawing of top flange support concrete cast-in-situ and WELDING STUDS cross section.
Fig. 7 is lower flange ladle concrete component stereogram.
Fig. 8 is prefabricated steel girder segment stereogram.
Fig. 9 is the I-shaped prestressing force steel reinforced concrete combination simply supported girder bridge span centre cross-sectional view of fish belly of precast assembly.
Figure 10 is the I-shaped prestressing force steel reinforced concrete combination simply supported girder bridge bearing cross-sectional view of fish belly of precast assembly.
Figure 11 is stood using certain city of the I-shaped prestressing force steel reinforced concrete combination simply supported girder bridge of fish belly of precast assembly of the present invention
Hand over overbridge 48m main span elevation.
Figure 12 is certain city intersection overbridge 48m main span span centre cross-sectional view.
Figure 13 is certain city intersection overbridge 48m main span bearing cross-sectional view.
Figure 14 is certain city intersection overbridge 48m main spans lower flange ladle concrete component cross-sectional view.
In figure：1 web, 2 precast concrete floorings, 2a floorings groove profiles hole is pre- in 2b prefabricated bridge groove profiles hole
Stay reinforcing bar, all reserved steel bars of 2c prefabricated bridges plate, 3 longitudinal stiffeners, 4 lower flange ladle concrete components, 4a bottom wing balsh
The diaphragm plate that punches in bag concrete component, 4b inner surface pegs, particulate continuous grading in the ladle concrete component of 4c lower flanges
Concrete bodies, 4d lower flanges ladle concrete component wrapper sheet, 4e lower flanges ladle concrete component base plate, 4f lower flanges ladle is mixed
Solidifying soil component web, 4g lower flanges ladle concrete component top board, 5 transverse stiffeners, 6 abutment members, 6a bearing ribbed stiffeners, 6b
Abutment member lower flange, 6c bearing longitudinal stiffeners, the vertical ribbed stiffener of 6d bearings, bent plate in 6e abutment members, 6f standoff regions
Web below the ladle concrete edge of a wing, the WELDING STUDS group of 7 girder steel end anchorage region plate surface distributeds, 8 top flange plates, 9
Bearing presstressed reinforcing steel anchor point, 10 span centre open web type diaphragm plates, 10a span centre open web type diaphragm plate top booms, 10b span centre open web types
Diaphragm plate lower boom, 10c span centre open web type diaphragm plate braces, 10d span centre open web type diaphragm plate gusset plates, 11 floorings are wet to be connect
Seam, the horizontal wet seam of 11a floorings, 11b floorings longitudinal wet joints, 12 bearing open web type diaphragm plates, 12a bearings open web type is horizontal
Dividing plate top boom, 12b bearing open web type diaphragm plate lower booms, 12c bearing open web type diaphragm plate braces, 12d bearings open web type is horizontal
Dividing plate gusset plate, presstressed reinforcing steel in 13 lower flange ladle concrete components, the stringer set up under 14 prefabricated bridges, 15 upper limbs
Edge cluster type WELDING STUDS, the WELDING STUDS that 16 stringers, open web type diaphragm plate top boom surface are evenly arranged, 17 top flange upper surfaces
Uniform WELDING STUDS, 18 top flange upper table surface concrete supports, bent plate on 19 standoff region lower flanges, 20 fish belly i shaped cross section beams
Prefabricated unit, 21 is monolithic fish belly steel I-beam, 22 bridge pads, 23 bearing anchorage zone concrete.
Specific embodiment
First, the I-shaped prestressing force steel reinforced concrete of the fish belly of precast assembly combines the basic structure of simply supported girder bridge
Using prefabricated fish belly plate-girder and precast concrete floorings, ladle concrete is used in fish belly i-shaped beamses lower flange
Component, the stretch-draw prestressing force in the concrete of lower flange ladle concrete component.Its ratio of rise to span is controlled between 1/15-1/20,
Ratio of rise to span herein is defined as the depth-span ratio of I-shaped combination beam span centre, and lower flange fish belly line style is catenary or parabolic
Line；The ratio between its bearing depth of section and span centre maximum height are controlled between 1/2-2/3.Near standoff region web along girder
Length control determines that the shearing near bearing should meet according to the design shear of girder：
V≤tfhffv+0.75Agfgtanθ+Asfstanθ
In formula, V is design shear, and tf is web thickness, and hf_ is web height, fvIt is web shearing strength design load, Ag
It is the steel strand wires gross area, fg is steel strand wires tensile strength design load, and θ is that steel strand wires or the ladle concrete edge of a wing press from both sides with horizontal direction
Angle, As is ladle edge of a wing steel area, and fs is ladle edge of a wing steel tensile strength design load.
2nd, the I-shaped prestressing force steel reinforced concrete of the fish belly of precast assembly combines the construction method of simply supported girder bridge
<1>Precast concrete floorings and prefabricated fish belly i-shape steel beam in advance
The lifting age of precast concrete floorings 2, concrete slab set floorings groove profile hole 2a more than 180 days
And in groove profile hole reserved steel bar 2b, by reserving steel in cast-in-place connection top flange cluster type WELDING STUDS 15 and groove profile hole during lifting
Muscle 2b is connected (see Fig. 1 and Fig. 2).
During prefabricated fish belly i-shape steel beam, the lower flange ladle concrete component 4 of welding processing prefabricated unit, using girder steel
Beam stand processed, by lower flange ladle concrete component 4, top flange plate 8, web 1, transverse stiffener 5, longitudinal stiffener 3, bearing
Bent plate 6e, abutment member lower flange 6b, bearing ribbed stiffener 6a, bearing longitudinal stiffener 6c, the vertical ribbed stiffener 6d of bearing on component
(see Fig. 3) is welded into the beam prefabricated unit 20 of single fish belly i shaped cross section, (Fig. 4)；Tied up in lower flange ladle concrete component 4
Prick ring-type stirrup and constitute steel reinforcement cage with cableway, bellows is set, bellows is passed through in the ladle concrete component of lower flange
Punched diaphragm plate 4a and through bearing, and lower flange ladle concrete component wrapper sheet 4d is welded afterwards；Coagulation is installed at lower flange
Native tiltedly template, pours particulate continuous grading concrete bodies 4c, concrete curing in the ladle concrete component of lower flange；
Wherein, the beam prefabricated unit 20 of single fish belly i shaped cross section include two panels fish belly steel I-beam 21, (Fig. 4, Fig. 5),
Two panels fish belly steel I-beam distance is i-shaped beamses across medium-altitude 0.7-1.5 times.
Lower flange ladle concrete component base plate welds together with web along beam is elongated, in each transverse stiffener of web
Position bottom sets and punches diaphragm plate, in lower flange ladle concrete component web 4f, base plate 4e and wrapper sheet 4d inner surfaces arrangement
Inner surface peg 4b (wrapper sheet 4d does not burn-on first), the concrete in the ladle concrete component of lower flange is in the beam prefabricated list of whole I-shaped
Carried out again after the completion of unit 20 is prefabricated cast-in-place.The cast-in-place construction of concrete can to greatest extent be facilitated using ladle plate, and effectively
Lifting lower flange concrete and the globality of steel lower flange.See Fig. 6, Fig. 7 and Fig. 8
Concrete 4c in the ladle concrete component of lower flange uses particulate continuous grading anti-crack concrete, effectively to wrap
Wrap up in bellows and prevent crackle from occurring；The wet seam 11a of transverse direction of floorings uses rapid hardening slightly expanded concrete, longitudinal wet joint
11b uses fast hardening concrete so that floorings are longitudinally obtaining certain precompression, are conducive to the overall stress of bridge structure,
And can effectively prevent wet seam, bridge deck concrete from ftractureing, improve floorings durability.It is high near bearing position beam section
When spending less, the steel plate near the lower flange ladle concrete component at bearing position can use high strength steel with web, but most
2 times of big intensity no more than main body steel strength.It is contemplated that using high when anti-depth of section is smaller, girder steel shearing strength is not enough
Strength steel is bearing larger shearing.
Web and roof and floor surface layout WELDING STUDS group 7 near bearing, to ensure end anchorage area concrete and girder steel
Connection；The upper surface of top flange uses long and short two kinds of WELDING STUDS arrangements, and short WELDING STUDS is even distribution type, top flange upper table
The uniform length of WELDING STUDS 17 in face is 5-10cm, is used to connect in-situ deposited prefabricated top flange plate concrete support 18；WELDING STUDS long is collection
Beam formula, the top flange cluster type length of WELDING STUDS 15 long is 20-25cm, according to the position distribution of prefabricated bridge groove profile hole 2a, is used
See Fig. 6 to connect precast concrete floorings.
<2>On-site hoisting
After concrete curing, by the I-shaped prefabricated unit transport of prefabricated fish belly is to job site and positions lifting；Multi-disc
Between the prefabricated I-shaped prefabricated unit of fish belly, it is connected with bearing open web type diaphragm plate using span centre open web type diaphragm plate；
Span centre open web type diaphragm plate 10 is by span centre open web type diaphragm plate top boom 10a, span centre open web type diaphragm plate lower boom
The oblique 10c compositions of 10b, span centre open web type diaphragm plate；Bearing open web type diaphragm plate 12 by bearing open web type diaphragm plate top boom 12a,
The oblique 12c compositions of bearing open web type diaphragm plate lower boom 12b, bearing open web type diaphragm plate.See Fig. 9 and Figure 10
<3>Stretch-draw prestressing force
After the completion of the wet joint concrete maintenance of concrete slab, prestressing force in the ladle concrete component of tensioning lower flange
Muscle, forms the I-shaped prestressing force steel reinforced concrete combination simply supported girder bridge of fish belly of precast assembly.
3rd, the I-shaped prestressing force steel reinforced concrete of the fish belly of precast assembly combines the application of simply supported girder bridge
The main span across footpath of certain city intersection overbridge is 48m, and two-way six-lane, bridge lateral design width is 21.5m, under
The track major trunk roads of city eight are crossed in portion, and owner requires to suspend traffic, therefore uses the fish belly of precast assembly proposed by the present invention
Plate-girder prestressing force steel reinforced concrete combines simply supported girder bridge scheme.
Main span is 48m, and ratio of rise to span is chosen for 1/16, and span centre girder steel is highly 3.0m, and support thickness is 0.1m, bridge floor thickness of slab
It is 0.2m to spend, and bearing position girder steel is highly 1.5m.Monolithic girder steel spacing elects 3m as, and left and right sides cantilever chooses 2.2m, middle part
Cantilever chooses 2.0m, sets 8 deformed bar holes in the ladle concrete component of lower flange altogether, and a branch of 7 φ is used per hole
15.2mm1860 prestress wires.Laterally use 3 beam prefabricated units of fish belly i shaped cross section.The facade of the bridge main span is shown in figure
11, span centre is transversal to meet personally Figure 12, and bearing is transversal to meet personally Figure 13, lower flange ladle concrete component cross section Figure 14.
The method that the present invention is used completed main span steel beam lifting in 2-3 days after the completion of girder steel is prefabricated, and at night
Lifting concrete slab, situ wet operation amount is small, and lifting is quick, safety, without airborne dust operation, significantly reduces Urban Bridge and applies
Obstruction of the work to traffic.
Claims (9)
1. a kind of I-shaped prestressing force steel reinforced concrete of fish belly of precast assembly combines the construction method of simply supported girder bridge, it is characterised in that use
Prefabricated fish belly plate-girder and precast concrete floorings, use ladle concrete component, in bottom wing in fish belly i-shaped beamses lower flange
Stretch-draw prestressing force in the concrete of balsh bag concrete component；Specific operation according to the following steps is carried out：
<1>Precast concrete floorings and prefabricated fish belly i-shape steel beam in advance
During prefabricated fish belly i-shape steel beam, the lower flange ladle concrete component of welding processing prefabricated unit, using girder steel beam
Stand, by lower flange ladle concrete component, top flange plate, web, transverse stiffener, longitudinal stiffener, standoff region web,
Abutment member lower flange, bearing ribbed stiffener, bearing transverse stiffener, that the vertical ribbed stiffener of bearing is welded into single beam fish belly is I-shaped
Prefabricated unit；Colligation ring-type stirrup constitutes steel reinforcement cage with cableway in the ladle concrete component of lower flange, sets bellows,
Bellows is through diaphragm plate with holes in the component of lower flange and passes through bearing, and lower flange wrapper sheet is welded afterwards；Installed at lower flange
The oblique template of concrete, pours lower flange ladle plate inner concrete, concrete curing；
<2>On-site hoisting
After concrete curing, by the I-shaped prefabricated unit transport of prefabricated fish belly is to job site and positions lifting；Multi-disc is prefabricated
Between the I-shaped prefabricated unit of fish belly, it is connected with bearing open web type diaphragm plate using span centre open web type diaphragm plate；
<3>Stretch-draw prestressing force
After the completion of the wet joint concrete maintenance of concrete slab, presstressed reinforcing steel, shape in the ladle concrete component of tensioning lower flange
Into the I-shaped prestressing force steel reinforced concrete combination simply supported girder bridge of fish belly of precast assembly.
2. construction method according to claim 1, it is characterised in that：The lifting age of the precast concrete floorings exists
More than 180 days, concrete slab set floorings groove profile hole and the reserved steel bar in groove profile hole, and cast-in-place coagulation is passed through during lifting
Native top flange cluster type WELDING STUDS is connected with reserved steel bar in groove profile hole.
3. construction method according to claim 1, it is characterised in that：The single I-shaped prefabricated unit of beam fish belly includes
Two panels fish belly steel I-beam, two panels fish belly steel I-beam distance is i-shaped beamses across medium-altitude 0.7-1.5 times.
4. construction method according to claim 1, it is characterised in that：The lower flange ladle concrete component base plate and abdomen
Plate welds together along beam is elongated, the diaphragm plate that punches is set in each transverse stiffener position bottom of web, in lower flange ladle
The web of concrete component, base plate and wrapper sheet inner surface arrangement WELDING STUDS, the concrete in the ladle concrete component of lower flange exist
Carried out again after the completion of whole I-beam prefabricated unit is prefabricated cast-in-place.
5. construction method according to claim 1, it is characterised in that：Coagulation in the lower flange ladle concrete component
Soil uses particulate continuous grading anti-crack concrete；The wet seam of transverse direction of the floorings uses rapid hardening slightly expanded concrete, longitudinal direction
Wet seam uses fast hardening concrete.
6. construction method according to claim 1, it is characterised in that：Web and roof and floor surface cloth near the bearing
Put WELDING STUDS group；The upper surface of the top flange uses long and short two kinds of WELDING STUDS arrangements, and short WELDING STUDS is even distribution type,
The short WELDING STUDS length of cloth is 5-10cm；WELDING STUDS long is cluster type, and cluster type WELDING STUDS length long is 20-25cm.
7. the construction method described in claim 1, it is characterised in that：The span centre open web type diaphragm plate is by span centre open web type tabula
Plate top boom, span centre open web type diaphragm plate lower boom, span centre open web type diaphragm plate are tiltedly constituted；The bearing open web type diaphragm plate by
Bearing open web type diaphragm plate top boom, bearing open web type diaphragm plate lower boom, bearing open web type diaphragm plate are tiltedly constituted.
8. the I-shaped prestressing force steel reinforced concrete of the fish belly of the precast assembly that construction method described in claim 1 is obtained combines simply supported girder bridge,
It is characterized in that：The ratio of rise to span of steel reinforced concrete combination simply supported girder bridge is controlled between 1/15-1/20, and lower flange fish belly line style is stretched wire
Line or parabola.
9. the I-shaped prestressing force steel reinforced concrete of the fish belly of precast assembly according to claim 8 combines simply supported girder bridge, and its feature exists
In：The control of the ratio between the bearing depth of section and span centre maximum height of steel reinforced concrete combination simply supported girder bridge is between 1/2-2/3.
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| CN108360742A (en) * | 2018-04-05 | 2018-08-03 | 南京林业大学 | A kind of prestressing with bond bamboo H-beam |
| CN109024219B (en) * | 2018-07-30 | 2020-12-25 | 湖南大学 | Prefabricated ultrahigh-performance concrete-common concrete combined beam bridge structure and construction method |
| CN109235223A (en) * | 2018-10-29 | 2019-01-18 | 中铁二院工程集团有限责任公司 | A kind of Novel steel-concrete composite beam bridge structure |
| CN111460717B (en) * | 2020-03-31 | 2022-04-08 | 广西交科集团有限公司 | Influence line-based method for counting passing equivalent times of overloaded vehicle of simply supported beam bridge |
| CN114319717B (en) * | 2020-09-30 | 2022-10-14 | 华中科技大学 | Prefabricated assembled steel-concrete composite beam |
| US20240060253A1 (en) * | 2021-09-24 | 2024-02-22 | Pramod Kumar Singh | Composite rcc deck and prestressed parabolic bottom chord underslung open web steel girder bridge superstructure |
| CN114086458A (en) * | 2021-12-27 | 2022-02-25 | 福州大学 | Steel-concrete combined box girder structure with wave-shaped upper flange beam and construction method |
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| US5305572A (en) * | 1991-05-31 | 1994-04-26 | Yee Alfred A | Long span post-tensioned steel/concrete truss and method of making same |
| CN1721636A (en) * | 2004-07-13 | 2006-01-18 | 李勇 | Prestressed steel-concrete compound beam and manufacturing method thereof |
| CN102535328B (en) * | 2012-02-10 | 2014-03-26 | 中铁第五勘察设计院集团有限公司 | In-pipe prestressed steel-pipe truss composite simply-supported beam structure |
| CN203128995U (en) * | 2013-02-25 | 2013-08-14 | 同济大学 | Combined T-girder component and combined T-girder bridge |
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