CN105064196A - Prefabricated and assembled fish-belly I-shaped prestressed steel-concrete composite simple supported girder bridge and construction method thereof - Google Patents
Prefabricated and assembled fish-belly I-shaped prestressed steel-concrete composite simple supported girder bridge and construction method thereof Download PDFInfo
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Abstract
The invention discloses a prefabricated and assembled fish-belly I-shaped prestressed steel-concrete composite simple supported girder bridge. A prefabricated fish-belly plate girder and a prefabricated concrete bridge deck are adopted; a steel-clad concrete member is adopted at the bottom flange of a fish-belly I-shaped girder; and prestress is tensioned in concrete of the steel-clad concrete member at the bottom flange; therefore, the flexural rigidity of a steel girder is greatly enhanced, the prestress of the concrete of the bridge deck of a finished bridge is increased, the spanning capability of a simply supported composite girder is greatly improved, the atmospheric exposure of a prestressed reinforcement is avoided and the durability and reliability of the prestressed reinforcement are greatly improved. Meanwhile, the steel-concrete composite simple supported girder bridge with the structure, disclosed by the invention, can be conveniently transported, prefabricated and assembled and can also completely satisfy requirements of prefabricating members in a factory and rapidly mounting the members on site. Therefore, the invention further discloses a corresponding construction method, which is safe, excellent, convenient and fast in construction.
Description
Technical field
The invention belongs to communications and transportation bridge engineeting field, particularly relate to a kind of fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge and construction method thereof of precast assembly.
Background technology
Along with the development of multilevel traffic infrastructure, when the construction of populated area Urban Bridge or the construction of speedway cross-line, be faced with the problem of bridge construction work progress uninterrupted traffic under heavy traffic condition, to working security, this requires that high, construction period requires short, also will take into account view and environmental requirement simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of component and facilitates prefabricated, the in-site installation fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly and construction method thereof fast, and to meet, multilevel traffic working security is high, the cycle is short, focus on the requirement of view and environmental protection.
For solving the problems of the technologies described above, the present invention is by the following technical solutions: the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly, adopt prefabricated fish belly plate-girder and precast concrete bridge deck, ladle concrete component is adopted, stretch-draw prestressing force in the concrete of bottom flange ladle concrete component in fish belly i-shaped beams bottom flange.
The ratio of rise to span of this steel reinforced concrete combination simply supported girder bridge controls between 1/15-1/20, and bottom flange fish belly line style is catenary or parabola.
This steel reinforced concrete combination bearing depth of section of simply supported girder bridge and the ratio of span centre maximum height control between 1/2-2/3.
The construction method of the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of above-mentioned precast assembly, comprises the following steps:
<1> shifts to an earlier date precast concrete bridge deck and prefabricated fish belly i-shape steel beam
During prefabricated fish belly i-shape steel beam, the bottom flange ladle concrete component of welding processing prefabricated unit, adopt girder steel beam stand, bottom flange ladle concrete component, top flange plate, web, transverse stiffener, longitudinal stiffener, standoff region web, abutment member bottom flange, bearing stiffening rib, bearing transverse stiffener, the vertical stiffening rib of bearing are welded into single beam fish belly I shape prefabricated unit; In the ladle concrete component of bottom flange, colligation ring-type stirrup and handling reinforcement form reinforcing cage, arrange bellows, and bellows, through diaphragm with holes in the component of bottom flange and through bearing, welds bottom flange wrapper sheet afterwards; At bottom flange place, the oblique template of concrete is installed, builds bottom flange ladle plate inner concrete, concrete curing;
<2> on-site hoisting
After concrete curing, prefabricated fish belly I shape prefabricated unit is transported to job site and locates lifting; Between multi-disc prefabricated fish belly I shape prefabricated unit, span centre open web type diaphragm is adopted to be connected with bearing open web type diaphragm;
<3> stretch-draw prestressing force
Concrete slab wets after joint concrete maintenance completes, and presstressed reinforcing steel in the ladle concrete component of stretch-draw bottom flange, forms the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly.
Lifting length of time of precast concrete bridge deck more than 180 days, concrete slab bridge deck grooved hole is set and in grooved hole reserved steel bar, be connected with reserved steel bar in grooved hole by cast-in-situ concrete top flange cluster type WELDING STUDS during lifting.
Single beam fish belly I shape prefabricated unit comprises two panels fish belly steel I-beam, and two panels fish belly steel I-beam distance is that i-shaped beams is across medium-altitude 0.7-1.5 times.
Bottom flange ladle concrete component base plate and web weld together along beam is elongated, in the bottom, each transverse stiffener position of web, the diaphragm that punches is set, arrange WELDING STUDS at the web of bottom flange ladle concrete component, base plate and wrapper sheet inner surface, the concrete in the ladle concrete component of bottom flange whole i beam prefabricated unit is prefabricated complete after carry out again cast-in-place.
Concrete in the ladle concrete component of bottom flange adopts particulate continuous grading anti-crack concrete; The transverse direction of the bridge deck seam that wets adopts rapid hardening slightly expanded concrete, and longitudinal wet joint adopts fast hardening concrete.
WELDING STUDS group is arranged on web near bearing and roof and floor surface; The upper surface of top flange adopts long and short two kinds of WELDING STUDS arrangements, and short WELDING STUDS is even distribution type, and uniform short WELDING STUDS length is 5-10cm; Long WELDING STUDS is cluster type, and the long WELDING STUDS length of cluster type is 20-25cm.
Span centre open web type diaphragm is tiltedly made up of span centre open web type diaphragm upper chord, span centre open web type diaphragm lower chord, span centre open web type diaphragm; Bearing open web type diaphragm is tiltedly made up of bearing open web type diaphragm upper chord, bearing open web type diaphragm lower chord, bearing open web type diaphragm.
For meeting the strict demand of multilevel traffic construction, inventor has devised a kind of fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly, adopt prefabricated fish belly plate-girder and precast concrete bridge deck, ladle concrete component is adopted in fish belly i-shaped beams bottom flange, stretch-draw prestressing force in the concrete of bottom flange ladle concrete component, this significantly improves the bending rigidity of girder steel, after making into bridge, the compressive pre-stress of bridge deck concrete increases, the span ability of Beams is significantly increased, and avoid the atmospheric exposure of prestressed reinforcement, significantly improve durability and the unfailing performance of presstressed reinforcing steel.Meanwhile, the steel reinforced concrete of this structure combination simply supported girder bridge can transport easily, prefabricated, assembled, can meet the requirement of factory-made component and on-the-spot Fast Installation completely.Accordingly, inventor also establishes corresponding construction method, adopts this method construction safety, high-quality, convenient, fast.
Accompanying drawing explanation
Fig. 1 is the arrangement diagram of precast concrete bridge deck in the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly of the present invention.
Fig. 2 is the arrangement diagram of reserved slotted eye and reinforcing bar on monolithic bridge deck in Fig. 1 prefabricated bridge.
Fig. 3 is that facade detail drawing and abutment member schematic diagram are arranged in bearing position.
Fig. 4 is the beam prefabricated unit sectional view of single fish belly i shaped cross section.
Fig. 5 is the structural facades schematic diagram of the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly of the present invention.
Fig. 6 is the arrangement diagram of top flange support concrete cast-in-situ and WELDING STUDS cross section.
Fig. 7 is bottom flange ladle concrete component stereogram.
Fig. 8 is pre-manufactured steel girder segment stereogram.
Fig. 9 is the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge span centre cross sectional representation of precast assembly.
Figure 10 is the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge bearing cross sectional representation of precast assembly.
Figure 11 is certain city intersection bridge crossing 48m main span elevation of the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge applying precast assembly of the present invention.
Figure 12 is certain city intersection bridge crossing 48m main span span centre cross-sectional view.
Figure 13 is certain city intersection bridge crossing 48m main span bearing cross-sectional view.
Figure 14 is certain city intersection bridge crossing 48m main span bottom flange ladle concrete component cross-sectional view.
In figure: 1 web, 2 precast concrete bridge deck, 2a bridge deck grooved hole, reserved steel bar in 2b prefabricated bridge grooved hole, the all reserved steel bars of 2c prefabricated bridge plate, 3 longitudinal stiffeners, 4 bottom flange ladle concrete components, the diaphragm that punches in the ladle concrete component of 4a bottom flange, the peg that 4b bottom flange ladle concrete component inner surface is arranged, the particulate continuous grading concrete bodies of building in the ladle concrete component of 4c bottom flange, 4d bottom flange ladle concrete component wrapper sheet, 4e bottom flange ladle concrete component base plate, 4f bottom flange ladle concrete component web, 4g bottom flange ladle concrete component top board, 5 transverse stiffeners, 6 abutment member, 6a bearing stiffening rib, 6b abutment member bottom flange, 6c bearing longitudinal stiffener, the vertical stiffening rib of 6d bearing, bent plate in 6e abutment member, web below the 6f standoff region ladle concrete edge of a wing, the WELDING STUDS group of 7 girder steel end anchorage region plate surface distributed, 8 top flange plates, 9 bearing presstressed reinforcing steel anchor points, 10 span centre open web type diaphragms, 10a span centre open web type diaphragm upper chord, 10b span centre open web type diaphragm lower chord, 10c span centre open web type diaphragm brace, 10d span centre open web type diaphragm gusset plate, 11 bridge deck wet seam, 11a bridge deck are wet seam laterally, 11b bridge deck longitudinal wet joint, 12 bearing open web type diaphragms, 12a bearing open web type diaphragm upper chord, 12b bearing open web type diaphragm lower chord, 12c bearing open web type diaphragm brace, 12d bearing open web type diaphragm gusset plate, presstressed reinforcing steel in 13 bottom flange ladle concrete components, the stringer set up under 14 prefabricated bridges, 15 top flange cluster type WELDING STUDS, 16 stringers, the WELDING STUDS that open web type diaphragm upper chord surface uniform is arranged, the uniform WELDING STUDS of 17 top flange upper surface, 18 top flange upper surface concrete supports, bent plate on 19 standoff region bottom flanges, the beam prefabricated unit of 20 fish belly i shaped cross section, 21 is monolithic fish belly steel I-beam, 22 bridge pads, 23 bearing anchorage zone concrete.
Detailed description of the invention
One, the basic structure of the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly
Adopt prefabricated fish belly plate-girder and precast concrete bridge deck, adopt ladle concrete component in fish belly i-shaped beams bottom flange, stretch-draw prestressing force in the concrete of bottom flange ladle concrete component.Its ratio of rise to span controls between 1/15-1/20, and ratio of rise to span is herein defined as the depth-span ratio of I-shaped compound beam span centre, and bottom flange fish belly line style is catenary or parabola; The ratio of its bearing depth of section and span centre maximum height controls between 1/2-2/3.Determine according to the design shear of girder along the cut to lengthen of girder near standoff region web, the shearing near bearing should meet:
V≤t
fh
ff
v+0.75A
gf
gtanθ+A
Sf
stanθ
In formula, V is design shear, and tf is web thickness, h
ffor web height, fv is web shear strength design load, and Ag is the steel strand gross area, fg is steel strand tensile strength design load, θ is steel strand or the ladle concrete edge of a wing and horizontal direction angle, and As is ladle edge of a wing steel area, and fs is ladle edge of a wing steel tensile strength design load.
Two, the construction method of the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly
<1> shifts to an earlier date precast concrete bridge deck and prefabricated fish belly i-shape steel beam
Lifting length of time of precast concrete bridge deck 2 is more than 180 days, concrete slab bridge deck grooved hole 2a is set and in grooved hole reserved steel bar 2b, be connected (see Fig. 1 and Fig. 2) with reserved steel bar 2b in grooved hole by cast-in-place connection top flange cluster type WELDING STUDS 15 during lifting.
During prefabricated fish belly i-shape steel beam, the bottom flange ladle concrete component 4 of welding processing prefabricated unit, adopt girder steel beam stand, bottom flange ladle concrete component 4, top flange plate 8, web 1, transverse stiffener 5, longitudinal stiffener 3, standoff region web 6e, abutment member bottom flange 6b, bearing stiffening rib 6a, bearing transverse stiffener 6c, bearing vertical stiffening rib 6d (see Fig. 3) are welded into single beam fish belly I shape prefabricated unit 20, (Fig. 4); In bottom flange ladle concrete component 4, colligation ring-type stirrup and handling reinforcement form reinforcing cage, arrange bellows, and bellows, through diaphragm 4a with holes in the component of bottom flange and through bearing, welds bottom flange wrapper sheet 4d afterwards; At bottom flange place, the oblique template of concrete is installed, builds bottom flange ladle plate inner concrete 4c, concrete curing;
Wherein, single beam fish belly I shape prefabricated unit 20 comprises two panels fish belly steel I-beam 21, (Fig. 4, Fig. 5), and two panels fish belly steel I-beam distance is that i-shaped beams is across medium-altitude 0.7-1.5 times.
Bottom flange ladle concrete component base plate and web weld together along beam is elongated, in the bottom, each transverse stiffener position of web, the diaphragm that punches is set, arrange WELDING STUDS 4b (wrapper sheet 4d does not first burn-on) at web 4f, the base plate 4e of bottom flange ladle concrete component and wrapper sheet 4d inner surface, the concrete in the ladle concrete component of bottom flange whole i beam prefabricated unit 20 is prefabricated complete after carry out again cast-in-place.Adopt ladle plate can facilitate concrete cast-in-place construction to greatest extent, and effectively promote the globality of bottom flange concrete and steel bottom flange.See Fig. 6, Fig. 7 and Fig. 8
Concrete 4c in the ladle concrete component of bottom flange adopts particulate continuous grading anti-crack concrete, effectively to wrap up bellows and to prevent crackle from occurring; The transverse direction of the bridge deck seam 11a that wets adopts rapid hardening slightly expanded concrete, longitudinal wet joint 11b adopts fast hardening concrete, bridge deck are made longitudinally to obtain certain precompression, the entirety being conducive to bridge construction is stressed, and can effectively prevent wet seam, bridge deck concrete from ftractureing, improve bridge deck durability.When bearing position beam section height is less, steel plate and the web of the bottom flange ladle concrete component near bearing position can adopt high strength steel, but maximum intensity is no more than 2 times of main body steel strength.Can consider when, girder steel shear strength less at anti-depth of section is not enough to adopt high strength steel to bear larger shearing.
WELDING STUDS group 7 is arranged, to ensure the connection of end anchorage district concrete and girder steel in web near bearing and roof and floor surface; The upper surface of top flange adopts long and short two kinds of WELDING STUDS arrangements, and short WELDING STUDS is even distribution type, and uniform short WELDING STUDS 17 length is 5-10cm, in order to connect in-situ deposited prefabricated top flange plate concrete support 18; Long WELDING STUDS is cluster type, and cluster type long WELDING STUDS 15 length is 20-25cm, according to the position distribution of prefabricated bridge grooved hole 2a, sees Fig. 6 in order to connect precast concrete bridge deck.
<2> on-site hoisting
After concrete curing, prefabricated fish belly I shape prefabricated unit is transported to job site and locates lifting; Between multi-disc prefabricated fish belly I shape prefabricated unit, span centre open web type diaphragm is adopted to be connected with bearing open web type diaphragm;
Span centre open web type diaphragm 10 is made up of span centre open web type diaphragm upper chord 10a, span centre open web type diaphragm lower chord 10b, the oblique 10c of span centre open web type diaphragm; Bearing open web type diaphragm 12 is made up of bearing open web type diaphragm upper chord 12a, bearing open web type diaphragm lower chord 12b, the oblique 12c of bearing open web type diaphragm.See Fig. 9 and Figure 10.
<3> stretch-draw prestressing force
Concrete slab wets after joint concrete maintenance completes, and presstressed reinforcing steel in the ladle concrete component of stretch-draw bottom flange, forms the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly.
Three, the application of the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly
The main span of certain city intersection bridge crossing is 48m across footpath, two-way six-lane, bridge lateral design width is 21.5m, track, leap city eight, bottom major trunk roads, owner requires to suspend traffic, therefore the fish belly plate-girder prestressing force steel reinforced concrete combination simply supported girder bridge scheme of the precast assembly adopting the present invention to propose.
Main span is 48m, and ratio of rise to span is chosen for 1/16, and span centre girder steel height is 3.0m, and support thickness is 0.1m, and bridge deck thickness is 0.2m, and bearing position girder steel height is 1.5m.Monolithic girder steel spacing elects 3m as, and left and right sides cantilever chooses 2.2m, and middle part cantilever chooses 2.0m, arranges 8 prestressed reinforcement holes in the ladle concrete component of bottom flange altogether, and every hole adopts a branch of 7 φ 15.2mm1860 prestress wires.Laterally adopt 3 beam prefabricated unit of fish belly i shaped cross section.The facade of this bridge main span is shown in Figure 11, and span centre is transversal meets personally Figure 12, and bearing is transversal meets personally Figure 13, bottom flange ladle concrete component cross section Figure 14.
The present invention adopt method girder steel is prefabricated complete after in 2-3 days, main span steel beam lifting is completed, and lifting concrete slab at night, situ wet workload is little, and lifting is quick, safety, without airborne dust operation, significantly reduce the obstruction of Urban Bridge construction to traffic.
Claims (10)
1. the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of a precast assembly, it is characterized in that: adopt prefabricated fish belly plate-girder and precast concrete bridge deck, ladle concrete component is adopted, stretch-draw prestressing force in the concrete of bottom flange ladle concrete component in fish belly i-shaped beams bottom flange.
2. the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly according to claim 1, is characterized in that: the ratio of rise to span of this steel reinforced concrete combination simply supported girder bridge controls between 1/15-1/20, and bottom flange fish belly line style is catenary or parabola.
3. the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly according to claim 1, is characterized in that: this steel reinforced concrete combination bearing depth of section of simply supported girder bridge and the ratio of span centre maximum height control between 1/2-2/3.
4. the construction method of the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly described in claim 1, is characterized in that comprising the following steps:
<1> shifts to an earlier date precast concrete bridge deck and prefabricated fish belly i-shape steel beam
During prefabricated fish belly i-shape steel beam, the bottom flange ladle concrete component of welding processing prefabricated unit, adopt girder steel beam stand, bottom flange ladle concrete component, top flange plate, web, transverse stiffener, longitudinal stiffener, standoff region web, abutment member bottom flange, bearing stiffening rib, bearing transverse stiffener, the vertical stiffening rib of bearing are welded into single beam fish belly I shape prefabricated unit; In the ladle concrete component of bottom flange, colligation ring-type stirrup and handling reinforcement form reinforcing cage, arrange bellows, and bellows, through diaphragm with holes in the component of bottom flange and through bearing, welds bottom flange wrapper sheet afterwards; At bottom flange place, the oblique template of concrete is installed, builds bottom flange ladle plate inner concrete, concrete curing;
<2> on-site hoisting
After concrete curing, prefabricated fish belly I shape prefabricated unit is transported to job site and locates lifting; Between multi-disc prefabricated fish belly I shape prefabricated unit, span centre open web type diaphragm is adopted to be connected with bearing open web type diaphragm;
<3> stretch-draw prestressing force
Concrete slab wets after joint concrete maintenance completes, and presstressed reinforcing steel in the ladle concrete component of stretch-draw bottom flange, forms the fish belly I shape prestressing force steel reinforced concrete combination simply supported girder bridge of precast assembly.
5. construction method according to claim 4, it is characterized in that: lifting length of time of described precast concrete bridge deck is more than 180 days, concrete slab bridge deck grooved hole is set and in grooved hole reserved steel bar, be connected with reserved steel bar in grooved hole by cast-in-situ concrete top flange cluster type WELDING STUDS during lifting.
6. construction method according to claim 4, is characterized in that: described single beam fish belly I shape prefabricated unit comprises two panels fish belly steel I-beam, and two panels fish belly steel I-beam distance is that i-shaped beams is across medium-altitude 0.7-1.5 times.
7. construction method according to claim 4, it is characterized in that: described bottom flange ladle concrete component base plate and web weld together along beam is elongated, in the bottom, each transverse stiffener position of web, the diaphragm that punches is set, arrange WELDING STUDS at the web of bottom flange ladle concrete component, base plate and wrapper sheet inner surface, the concrete in the ladle concrete component of bottom flange whole i beam prefabricated unit is prefabricated complete after carry out again cast-in-place.
8. construction method according to claim 4, is characterized in that: the concrete in the ladle concrete component of described bottom flange adopts particulate continuous grading anti-crack concrete; The transverse direction of the described bridge deck seam that wets adopts rapid hardening slightly expanded concrete, and longitudinal wet joint adopts fast hardening concrete.
9. construction method according to claim 4, is characterized in that: WELDING STUDS group is arranged on the web near described bearing and roof and floor surface; The upper surface of described top flange adopts long and short two kinds of WELDING STUDS arrangements, and short WELDING STUDS is even distribution type, and uniform short WELDING STUDS length is 5-10cm; Long WELDING STUDS is cluster type, and the long WELDING STUDS length of cluster type is 20-25cm.
10. construction method according to claim 4, is characterized in that: described span centre open web type diaphragm is tiltedly made up of span centre open web type diaphragm upper chord, span centre open web type diaphragm lower chord, span centre open web type diaphragm; Described bearing open web type diaphragm is tiltedly made up of bearing open web type diaphragm upper chord, bearing open web type diaphragm lower chord, bearing open web type diaphragm.
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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 |
| CN109024219A (en) * | 2018-07-30 | 2018-12-18 | 湖南大学 | A kind of prefabricated ultra-high performance concrete-normal concrete composite beam bridge girder construction 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 |
| CN111460717A (en) * | 2020-03-31 | 2020-07-28 | 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 |
| 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 |
| CN114319717A (en) * | 2020-09-30 | 2022-04-12 | 华中科技大学 | Prefabricated assembled steel-concrete composite beam |
| WO2023047408A1 (en) * | 2021-09-24 | 2023-03-30 | Pramod Kumar Singh | Composite rcc deck and prestressed parabolic bottom chord underslung open web steel girder bridge superstructure |
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| WO2023047408A1 (en) * | 2021-09-24 | 2023-03-30 | 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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