CN105064195A - Internal prestress steel and concrete combined simply supported girder bridge of prefabricated and assembled fish-bellied corrugated steel web and construction method thereof - Google Patents
Internal prestress steel and concrete combined simply supported girder bridge of prefabricated and assembled fish-bellied corrugated steel web and construction method thereof Download PDFInfo
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Abstract
The invention discloses an internal prestress steel and concrete combined simply supported girder bridge of a prefabricated and assembled fish-bellied corrugated steel web and a construction method thereof. A prefabricated fish-bellied corrugated steel web girder and a prefabricated concrete bridge deck are adopted, a ladle concrete component is adopted at the lower flange of the fish-bellied corrugated steel web girder, and prestress is stretched in concrete of the ladle concrete component at the lower flange. A web is in a fish-bellied corrugated shape, so that the weight of the bridge can be greatly reduced; the ladle concrete component is adopted at the lower flange, and a prestressing duct is reserved so as to stretch the prestress, so that the stiffness and bending resistance of the corrugated steel web girder are obviously improved, the problem of air exposure of externally prestressed tendons of the corrugated steel web combined girder is solved, and thus the durability and reliability of the prestressed tendons are greatly improved. Meanwhile, the prestress steel and concrete combined simply supported girder of the corrugated steel web with the structure can be conveniently transported, prefabricated and assembled and can completely meet the requirements of factory-made components and quick field installation. Accordingly, the inventors also establish a corresponding construction method which is safe, convenient and quick in construction.
Description
Technical field
The invention belongs to communications and transportation bridge engineeting field, particularly relate to a kind of fish belly Wavelike steel webplate prestressing with bond 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 denser population areas 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.Wavelike steel webplate composite beam bridge has from heavy and light, advantage that rigidity is large, but the durability of its external pre-stress bundle constrains the extensive use of this structure in the complexity of construction.
Summary of the invention
The technical problem to be solved in the present invention be propose a kind of can quick prefabricated assembled, uninterrupted traffic, safe and reliable, durability strong, the fish belly Wavelike steel webplate prestressing with bond steel reinforced concrete of the precast assembly of environmental protection combination simply supported girder bridge and construction method thereof.
For solving the problems of the technologies described above, the present invention is by the following technical solutions: the fish belly Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge of precast assembly, adopt prefabricated fish belly Wavelike steel webplate beam and precast concrete bridge deck, ladle concrete component is adopted, stretch-draw prestressing force in the concrete of bottom flange ladle concrete component at fish belly Wavelike steel webplate lower flange of girder edge.
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 Wavelike steel webplate prestressing with bond 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 Wavelike steel webplate beam
During prefabricated fish belly Wavelike steel webplate beam, the steel parts of the bottom flange ladle concrete component of welding processing prefabricated unit, adopt girder steel beam stand, bottom flange ladle concrete component, Wavelike steel webplate, top flange plate, web steel column, bearing web, bearing stiffening rib, bearing bottom wing listrium are welded into the beam prefabricated unit of monolithic fish belly Wavelike steel webplate; Assembling reinforcement cage in the ladle concrete component of bottom flange also elongatedly in component arranges bellows, and bellows passes through support wire through bottom flange component diaphragm with holes; Weld wrapper sheet afterwards, the oblique template of concrete is installed, builds bottom flange ladle concrete component inner concrete;
<2> on-site hoisting
After bottom flange ladle concrete component inner concrete maintenance completes, prefabricated fish belly Wavelike steel webplate beam is transported to job site and locates lifting; Between multi-disc fish belly Wavelike steel webplate beam, open web type diaphragm is adopted to connect; After having welded, field cast-in-place block end crossbeam, afterwards hoisting prefabricated concrete slab, build bridge deck and to wet joint concrete;
<3> stretch-draw prestressing force
After concrete curing completes, the presstressed reinforcing steel in the ladle concrete component of stretch-draw bottom flange, forms the fish belly Wavelike steel webplate prestressing with bond 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 adopt reserved cast-in-place hole and in cast-in-place hole reserved steel bar, be connected with reserved steel bar in hole by cast-in-place connection top flange upper surface cluster type WELDING STUDS during lifting.
The beam prefabricated unit of each fish belly Wavelike steel webplate comprises two panels wave beams; Arrange one web steel column along Wavelike steel webplate every 2-4m, Wavelike steel webplate is connected with steel column on border, front and back, is connected with steel top flange, ladle concrete bottom flange at up-and-down boundary, and web steel column is connected with top flange plate jointly with web.
Bottom flange ladle concrete component is connected with fish belly Wavelike steel webplate, in the ladle concrete component of bottom flange, the diaphragm that punches is set every the below of the corresponding web steel column of 2-4m, WELDING STUDS arranged by the web of bottom flange ladle concrete component, base plate and wrapper sheet, the concrete in the ladle concrete component of bottom flange completes at whole prefabricated unit, cast-in-place again after in-built reinforcing bar and bellows.
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; Top flange plate upper surface adopts long and short two kinds of WELDING STUDS arrangements, and short WELDING STUDS is even distribution type, and the length of short WELDING STUDS is 5-10cm; Long WELDING STUDS is cluster type, and length is 20-25cm.
Open web type diaphragm is made up of open web type tabula upper chord, lower chord, brace, adopts gusset plate to connect between each rod member, and wherein tabula upper chord adopts gusset plate and web steel column to link together.
For meeting the strict demand of multilevel traffic construction, inventor has devised a kind of fish belly Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge of precast assembly, adopt prefabricated fish belly Wavelike steel webplate beam and precast concrete bridge deck, ladle concrete component is adopted, stretch-draw prestressing force in the concrete of bottom flange ladle concrete component at fish belly Wavelike steel webplate lower flange of girder edge.Wherein, web adopts fish belly waveform significantly can reduce bridge deadweight, adopt ladle concrete component in bottom flange and reserve prestressed pore passage can significantly improve Wavelike steel webplate beam beam body rigidity and bending resistance with stretch-draw prestressing force, solve the air exposure problem of Wavelike steel webplate compound beam external prestressing steels, significantly improve the durable of presstressed reinforcing steel and unfailing performance.Meanwhile, the Wavelike steel webplate prestressing force steel reinforced concrete of this structure combination simply supported beam 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, convenient, fast.
Accompanying drawing explanation
Fig. 1 is the structural facades schematic diagram of the fish belly Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge of precast assembly of the present invention.
Fig. 2 is the arrangement diagram of precast concrete bridge deck in the fish belly Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge of precast assembly of the present invention.
Fig. 3 is the arrangement diagram of reserving hole and reinforcing bar on monolithic bridge deck in Fig. 2 prefabricated bridge.
Fig. 4 is the fish belly Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge span centre cross-sectional view of precast assembly of the present invention.
Fig. 5 is the cross sectional representation of single prefabricated unit.
Fig. 6 is top flange support concrete cast-in-situ and WELDING STUDS arrangement diagram.
Fig. 7 is that facade detail drawing is arranged at bearing position.
Fig. 8 is certain city intersection bridge crossing 40m main span elevation of the fish belly Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge applying precast assembly of the present invention.
Fig. 9 is main span span centre cross-sectional view in Fig. 8.
Figure 10 is main span bearing cross-sectional view in Fig. 8.
Figure 11 is ladle concrete component cross-sectional view in main span bottom flange in Fig. 8.
Figure 12 is bottom flange ladle concrete component stereogram in Fig. 8.
Figure 13 is prefabricated fish belly Wavelike steel webplate girder segment stereogram in Fig. 8.
In figure: 1 precast concrete bridge deck, 1a prefabricated bridge reserves slotted eye, 1b prefabricated bridge reserves connecting reinforcement in slotted eye, the wet seam connecting reinforcement of 1c prefabricated bridge periphery, 2 bottom flange ladle concrete components, the diaphragm that punches in the ladle concrete component of 2a bottom flange, the peg that 2b bottom flange ladle concrete component inner surface is arranged, the particulate continuous grading concrete bodies of building in the ladle concrete component of 2c bottom flange, 2d bottom flange ladle concrete component wrapper sheet, 2e bottom flange ladle concrete component base plate, 2f bottom flange ladle concrete component web, 3 Wavelike steel webplates 4, top flange plate, 5 web steel columns, 6 bearing webs, 7 bearing stiffening ribs, 7a bearing support stiffening rib, 7b bearing transverse stiffener, the vertical stiffening rib of 7c bearing, 8 bearing bottom wing listriums, the beam prefabricated unit of 9 fish-bellied type Wavelike steel webplate, 10 open web type diaphragms, 10a open web type diaphragm upper chord, 10b open web type diaphragm brace, 10c open web type diaphragm lower chord, 10d gusset plate, 11 block end crossbeams, 12 bridge floors wet seam, 12a is wet seam laterally, 12b longitudinal wet joint, presstressed reinforcing steel in 13 bottom flange ladle concrete components, the short WELDING STUDS of 14 top flange upper surface even distribution type, 15 top flange plate supports, the long WELDING STUDS of 16 top flange cluster type, the stringer set up under 17 prefabricated bridges, WELDING STUDS on 18 stringers, the WELDING STUDS group that 19 bearing web surface are arranged.
Detailed description of the invention
One, the basic structure of the fish belly Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge of precast assembly
Adopt prefabricated fish belly Wavelike steel webplate beam and precast concrete bridge deck, adopt ladle concrete component at fish belly Wavelike steel webplate lower flange of girder edge, stretch-draw prestressing force in the concrete of bottom flange ladle concrete component.(see Fig. 1), its ratio of rise to span controls between 1/15-1/20, 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, tf is web thickness, hf is web height, and 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 Wavelike steel webplate prestressing with bond 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 Wavelike steel webplate beam
Lifting length of time of precast concrete bridge deck is more than 180 days, the impact of bridge deck shrinkage and creep on structure is made to drop to reduced levels, concrete slab adopt reserved cast-in-place hole 1a and in cast-in-place hole reserved steel bar 1b, be connected with reserved steel bar 1b in hole by cast-in-place connection top flange upper surface cluster type WELDING STUDS 16 during lifting.(Fig. 2 and Fig. 3)
During prefabricated fish belly Wavelike steel webplate beam, the steel parts of the bottom flange ladle concrete component 2 of welding processing prefabricated unit, adopt girder steel beam stand, bottom flange ladle concrete component 2, Wavelike steel webplate 3, top flange plate 4, web steel column 5, bearing web 6, bearing stiffening rib 7, bearing bottom wing listrium 8 are welded into the beam prefabricated unit 9 of monolithic fish belly Wavelike steel webplate; Assembling reinforcement cage in bottom flange ladle concrete component 2 also elongatedly in component arranges bellows, and bellows passes through support wire through bottom flange component diaphragm 2a with holes; Weld wrapper sheet 2b afterwards, the oblique template of concrete is installed, builds bottom flange ladle concrete component inner concrete 2c; (see Fig. 1 and Fig. 4)
Wherein, the beam prefabricated unit of each fish belly Wavelike steel webplate comprises two panels wave beams (see Fig. 5); Arrange one web steel column 5 along Wavelike steel webplate every 2-4m, Wavelike steel webplate is connected with steel column on border, front and back, is connected with steel top flange, ladle concrete bottom flange at up-and-down boundary, and web steel column 5 is connected with top flange plate 4 jointly with web 3.
Bottom flange ladle concrete component is connected with fish belly Wavelike steel webplate 1, in the ladle concrete component of bottom flange, the diaphragm 2a that punches is set every the below of the corresponding web steel column 5 of 2-4m, web 2f, the base plate 2e and wrapper sheet 2d of bottom flange ladle concrete component arrange WELDING STUDS (wrapper sheet 2d does not first burn-on), the concrete in the ladle concrete component of bottom flange complete at whole prefabricated unit, cast-in-place again after in-built reinforcing bar and bellows.Steel work due to bottom flange ladle concrete component is hatch frame, therefore setting punches diaphragm to increase the globality of structure; Adopt ladle plate can facilitate concrete cast-in-place construction to greatest extent, effectively increase the globality of bottom flange concrete and steel bottom flange.When bearing position beam section height is less, bottom flange ladle concrete component and web can adopt high strength steel, but maximum intensity is no more than 2 times of main body steel strength; When, girder steel shear strength less at anti-depth of section is not enough, can consider to adopt high strength steel to bear larger shearing.
Concrete 2c in the ladle concrete component of bottom flange adopts particulate continuous grading anti-crack concrete, effectively can wrap up bellows and prevent crackle from occurring; The transverse direction of the bridge deck seam 12a that wets adopts rapid hardening slightly expanded concrete, longitudinal wet joint 12b adopts fast hardening concrete, and make bridge deck longitudinally obtain certain precompression, the entirety being conducive to bridge construction is stressed, and can effectively prevent bridge deck from ftractureing, improve bridge deck durability.
WELDING STUDS group 19 is arranged, in order to connect the cast-in-situ concrete block end crossbeam in later stage in web near bearing and roof and floor surface; Top flange plate upper surface adopts long and short two kinds of WELDING STUDS arrangements, and short WELDING STUDS 14 is even distribution type, and the length of short WELDING STUDS is 5-10cm, in order to in-situ deposited prefabricated top flange plate support 15; Long WELDING STUDS is cluster type 16, and length is 20-25cm, according to the position distribution of prefabricated bridge connecting hole, in order to connect precast concrete bridge deck 1.(see Fig. 6)
<2> on-site hoisting
After bottom flange ladle concrete component inner concrete maintenance completes, prefabricated fish belly Wavelike steel webplate beam is transported to job site and locates lifting; Between multi-disc fish belly Wavelike steel webplate beam, open web type diaphragm 10 is adopted to connect; After having welded, field cast-in-place block end crossbeam 11, afterwards hoisting prefabricated concrete slab 1, build bridge deck and to wet seam 12 concrete;
Open web type diaphragm is made up of open web type tabula upper chord 10a, lower chord 10b, brace 10c, adopts gusset plate 10d to connect between each rod member, and wherein tabula upper chord adopts gusset plate 10d and web steel column 5 to link together.
<3> stretch-draw prestressing force
After concrete curing completes, the presstressed reinforcing steel 13 in stretch-draw bottom flange ladle concrete component 2, forms the fish belly Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge of precast assembly.
Three, the application of the fish belly Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge of precast assembly
The main span of certain city intersection bridge crossing is 40m 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 Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge scheme of the precast assembly adopting the present invention to propose.
Main span is 40m, 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 6 prefabricated fish belly Wavelike steel webplate prestressing force steel reinforced concrete combination simply supported beams.The facade of this bridge main span is shown in Fig. 8, and span centre is transversal meets personally Fig. 9, and bearing is transversal meets personally Figure 10, and the cross section soil of bottom flange ladle concrete component is shown in Figure 11-12 with stereogram, and the stereogram of prestressing force Wavelike steel webplate compound beam girder steel prefabricated subsection is shown in Figure 13.
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 Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge of a precast assembly, it is characterized in that: adopt prefabricated fish belly Wavelike steel webplate beam and precast concrete bridge deck, ladle concrete component is adopted, stretch-draw prestressing force in the concrete of bottom flange ladle concrete component at fish belly Wavelike steel webplate lower flange of girder edge.
2. the fish belly Wavelike steel webplate prestressing with bond steel reinforced concrete combination simply supported girder bridge of precast assembly according to claim 1, it 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, bottom flange fish belly line style is catenary or parabola.
3. the fish belly Wavelike steel webplate prestressing with bond 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 Wavelike steel webplate prestressing with bond 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 Wavelike steel webplate beam
During prefabricated fish belly Wavelike steel webplate beam, the steel parts of the bottom flange ladle concrete component of welding processing prefabricated unit, adopt girder steel beam stand, bottom flange ladle concrete component, Wavelike steel webplate, top flange plate, web steel column, bearing web, bearing stiffening rib, bearing bottom wing listrium are welded into the beam prefabricated unit of monolithic fish belly Wavelike steel webplate; Assembling reinforcement cage in the ladle concrete component of bottom flange also elongatedly in component arranges bellows, and bellows passes through support wire through bottom flange component diaphragm with holes; Weld wrapper sheet afterwards, the oblique template of concrete is installed, builds bottom flange ladle concrete component inner concrete;
<2> on-site hoisting
After bottom flange ladle concrete component inner concrete maintenance completes, prefabricated fish belly Wavelike steel webplate beam is transported to job site and locates lifting; Between multi-disc fish belly Wavelike steel webplate beam, open web type diaphragm is adopted to connect; After having welded, field cast-in-place block end crossbeam, afterwards hoisting prefabricated concrete slab, build bridge deck and to wet joint concrete;
<3> stretch-draw prestressing force
After concrete curing completes, the presstressed reinforcing steel in the ladle concrete component of stretch-draw bottom flange, forms the fish belly Wavelike steel webplate prestressing with bond 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 adopt reserved cast-in-place hole and in cast-in-place hole reserved steel bar, be connected with reserved steel bar in hole by cast-in-place connection top flange upper surface cluster type WELDING STUDS during lifting.
6. construction method according to claim 4, is characterized in that: the beam prefabricated unit of each described fish belly Wavelike steel webplate comprises two panels wave beams; Arrange one web steel column along Wavelike steel webplate every 2-4m, Wavelike steel webplate is connected with steel column on border, front and back, is connected with steel top flange, ladle concrete bottom flange at up-and-down boundary, and web steel column is connected with top flange plate jointly with web.
7. construction method according to claim 4, it is characterized in that: described bottom flange ladle concrete component is connected with fish belly Wavelike steel webplate, in the ladle concrete component of bottom flange, the diaphragm that punches is set every the below of the corresponding web steel column of 2-4m, WELDING STUDS arranged by the web of bottom flange ladle concrete component, base plate and wrapper sheet, the concrete in the ladle concrete component of bottom flange completes at whole prefabricated unit, cast-in-place again after in-built reinforcing bar and bellows.
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; Described top flange plate upper surface adopts long and short two kinds of WELDING STUDS arrangements, and short WELDING STUDS is even distribution type, and the length of short WELDING STUDS is 5-10cm; Long WELDING STUDS is cluster type, and length is 20-25cm.
10. construction method according to claim 4, it is characterized in that: described open web type diaphragm is made up of open web type tabula upper chord, lower chord, brace, adopt gusset plate to connect between each rod member, wherein tabula upper chord adopts gusset plate and web steel column to link together.
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| CN114737594A (en) * | 2022-05-06 | 2022-07-12 | 江苏海洋大学 | Large-span unbonded prestressed tendon's fish belly formula foundation beam |
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Also Published As
| Publication number | Publication date |
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| CN105064195B (en) | 2017-07-11 |
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