CN203080397U - Assembly-type saddle-shell-shaped bottom plate continuous box girder bridge - Google Patents
Assembly-type saddle-shell-shaped bottom plate continuous box girder bridge Download PDFInfo
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- CN203080397U CN203080397U CN 201220746813 CN201220746813U CN203080397U CN 203080397 U CN203080397 U CN 203080397U CN 201220746813 CN201220746813 CN 201220746813 CN 201220746813 U CN201220746813 U CN 201220746813U CN 203080397 U CN203080397 U CN 203080397U
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Abstract
The utility model provides an assembly-type saddle-shell-shaped bottom plate continuous box girder bridge. A pre-tensioning method pre-stressed concrete saddle-shell-shaped plate is used as a bottom plate of the continuous box girder bridge, corrugated steel webs are used as webs of the continuous box girder bridge, a pre-stressed concrete top plate of the continuous box girder bridge is cast in place in a segmented mode, pre-stressed steel bars for anchoring the top plate are tensioned in batches, and the novel integral assembly-type continuous box girder bridge is formed. The prefabricated pre-tensioning method pre-stressed concrete saddle-shell-shaped plate is used for replacing a cast-in-place flat bottom plate of the concrete continuous box girder bridge, a bottom timber formwork and a supporting scaffold in construction of the concrete continuous box girder bridge are removed, the prefabricated pre-tensioning method pre-stressed concrete saddle-shell-shaped plate can also be used as a temporary construction platform, the engineering quantity for pouring concrete in place is reduced, and construction process of pre-stress tension anchorage of the lower portion of the continuous box girder bridge is simplified. The novel assembly-type continuous box girder bridge has the advantages of being high in construction speed, free of support construction, good in structural integrity, attractive in appearance, low in construction cost and the like, and is especially suitable for a rail transit viaduct with a large standard span and long mileage.
Description
Technical field
The utility model belongs to field of civil engineering, relates to a kind of unit construction bridge girder construction building technology, relates in particular to a kind of assembling saddle hull shape base plate Continuous Box Girder Bridge.
Background technology
Prestressed concrete continuous box girder bridge strong characteristics attractive in appearance with it, suitable have obtained in the highway bridge directly using widely medium and small striding.The continuous beam on many supports bridge construction adopts prestressed concrete box type section form usually, its closed thin-walled box-type section torsional rigidity is very big, roof and floor all has big area, can either resist huge edge of a wing pressure, can satisfy prestressed reinforcement again and arrange needs, can resist positive hogging moment effect effectively.The prestressed concrete continuous box girder bridge has advantages such as span ability is strong, structural safety big, good integrity, the rigidity of structure is big, torsional property good, deck expansion joint is few, and it is comfortable to drive a vehicle.
At present, medium and small concrete continuous case beam viaduct of striding the footpath adopts the cast in situs job practices usually, it is a kind of ancient job practices, it is a mounting template on construction bracket, the assembling reinforcement skeleton, reserve prestressed reinforcement bellows duct, and at the scene concreting with apply prestressed job practices, has good integrity, construction technology is simple, advantage such as no system conversion in the construction, but exist the poured in place concrete workload big, need to use a large amount of scaffolds to support, the wooden form consumption is big, weak points such as bottom prestressed reinforcement stretch-draw anchor difficulty and construction period are long.Along with developing rapidly of track traffics such as high-speed railway and subway light rail, the continuous viaduct of overlength circuit is more and more, the field engineering amount of building track traffic continuous box girder viaduct is very big, in order to accelerate project speed, save mould material, realize industrialized standard assembly method construction bridge, field of civil engineering is needed a kind of quick assembling badly and is built the construction technique of Continuous Box Girder Bridge.
Pre-tensioning system efficient prestressed concrete shape of a saddle roof panel formal name used at school is a hyperbolic paraboloid negative gauss curvature coverboard, is commonly called as the saddle plate.A spill parabola is made bus, make the lead parallel sliding along convex parabola, the curved surface that draws like this is exactly a hyperbolic paraboloid.The hyperbolic parabolic surface is made up of two family's straight edge lines, the mutual antarafacial of straight edge line of the same clan, and the straight edge line of family inequality intersects.On the hyperbolic parabolic surface, arrange the straight line tensioned prestressing bar, can make saddle coverboard member, form the strong shape of a saddle space coverboard structure of span ability being subjected to loading status can give full play to reinforcing bar and concrete speciality separately.Saddle coverboard prestressed reinforcement arranged crosswise, the two ends prestressed reinforcement separately can help the end cross-sectional shearing resistance, and concentrate at coverboard bottom prestressed reinforcement in the centre position, can help space coverboard opposing mid span moment.Prestressed concrete shape of a saddle coverboard is a kind of thin shell structures, shell thickness only is one of two percentages of its span, advantages such as that saddle shell-slab structure has is big from heavy and light, material saving, span, good looking appearance have been widely used in the roof structure of industrial construction factory building.
At the backward cast in situs job practices of the track traffic continuous box girder viaduct of mileage overlength, carry out the innovation reform of the prefabricated assemblingization of Continuous Box Girder Bridge, utilization prestressed concrete shape of a saddle coverboard is as concrete continuous box girder bridge base plate, utilize the web of corrugated sheet steel as Continuous Box Girder Bridge, the prestressed concrete top board of cast in situs box girder bridge forms a kind of novel assembling saddle hull shape base plate Continuous Box Girder Bridge.Adopt prestressed concrete shape of a saddle coverboard to substitute traditional prestressed concrete base slab, wooden form and support scaffolding when having removed the continuous box girder bridge construction from, interim operation platform that can the double as Continuous Box Girder Bridge, simplify Continuous Box Girder Bridge bottom prestressed reinforcement stretch-draw anchor construction technology, advantage such as it has quick construction, erection without scaffolding, driving is comfortable and cost is low.
The utility model content
Technical problem: the utility model provides a kind of no support scaffolding, save wooden form, reduce the assembling saddle hull shape base plate Continuous Box Girder Bridge of the site operation workload of Continuous Box Girder Bridge, utilization pretensioning prestressed concrete shape of a saddle coverboard is as the base plate member of Continuous Box Girder Bridge, the interim operation platform of double as is built Continuous Box Girder Bridge fast.
Technical scheme: assembling saddle hull shape base plate Continuous Box Girder Bridge of the present utility model comprises connecting saddle hull shape base plate, the collar tie beam that bears down on one, Wavelike steel webplate, column peg and the prestressed concrete top board that is provided with from bottom to up successively.The upside of the transverse ends of saddle hull shape base plate is connected with the collar tie beam that bears down on one respectively, base plate member as Continuous Box Girder Bridge, a Wavelike steel webplate is set between the top of each collar tie beam that bears down on one and the prestressed concrete top board, the lower end of Wavelike steel webplate is connected with the top of the collar tie beam that bears down on one, the upper end is connected with the prestressed concrete top board by the column peg, and the prestressed concrete top board adopts segmented cast-in-place method moulding.Be horizontally arranged with the concrete diaphragm in the continuous box girder, also be provided with the external prestressing muscle of broken line shape longitudinally in continuous box girder, the external prestressing muscle passes and is anchored on the concrete diaphragm.
In the utility model, 5 road concrete diaphragms are set in each bridge span hole of Continuous Box Girder Bridge, lay respectively at span centre, two quartile places and two end bearing places.Concrete diaphragm upside is connected with the bottom surface of prestressed concrete top board, and downside is connected with the upper side of saddle hull shape base plate, and the left and right sides is connected with a Wavelike steel webplate respectively.
In the utility model, also comprise concrete box girder No. zero sections that is arranged on the beam bridge standoff region, the Wavelike steel webplate of protection standoff region.The concrete web of concrete box girder No. zero sections wraps adjacent with it Wavelike steel webplate.
In the utility model, saddle hull shape base plate is prefabricated pre-tensioning system efficient prestressed concrete shape of a saddle coverboard.
The job practices of the assembling saddle hull shape base plate Continuous Box Girder Bridge that construction of the present utility model is above-mentioned may further comprise the steps:
The first step, the cast in situs reinforced concrete bridge pier, the pot bearing of installation bridge lifts prefabricate saddle hull shape base plate that has the collar tie beam that bears down on one to bridge pier, and adopts shape steel bracket to support saddle hull shape base plate temporarily;
Second step, the lifting Wavelike steel webplate puts in place, with about the lower end of two Wavelike steel webplates firmly weld with the top pre-embedded steel slab of collar tie beam of bearing down on one, double column peg firmly is welded on the top flange end face of Wavelike steel webplate, interim laterally steel is installed between adjacent two Wavelike steel webplates is supported, constitute stable steel frame;
The 3rd step, assembling reinforcement, the concrete diaphragm of cast in situs Continuous Box Girder Bridge and concrete box girder No. zero sections is removed the interim laterally steel of installing between two Wavelike steel webplates and is supported;
The 4th step, lay template, assembling reinforcement, pre-buried prestressed reinforcement bellows, segmented cast prestressed concrete top board, after the concrete knot is hard, the prestressed reinforcement of stretch-draw anchor prestressed concrete top board, the slip casting of bellows internal pressure;
In the 5th step, the external prestressing muscle of stretch-draw broken line shape is anchored on the concrete diaphragm, and railing is installed, and the bridge floor of mating formation forms assembling saddle hull shape base plate Continuous Box Girder Bridge.
Pre-tensioning system efficient prestressed concrete shape of a saddle shell-slab is the good space shell structure of a kind of stress performance, the plate-girder unification, utilization prestressed concrete shape of a saddle coverboard is as the base plate of Continuous Box Girder Bridge, utilize the web of corrugated sheet steel as Continuous Box Girder Bridge, the prestressed concrete top board of cast in situs box girder bridge can form a kind of novel assembling saddle hull shape base plate Continuous Box Girder Bridge.Prestressed concrete shape of a saddle coverboard is as the base plate of box girder bridge, the interim construction operation platform of double as, wooden form and support scaffolding when having removed the continuous box girder bridge construction from, be skillfully constructed, has innovative significance, prestressed reinforcement in the coverboard can be used as the bottom prestressed reinforcement of Continuous Box Girder Bridge, reform the prestressed stretch-draw anchor job practices of box girder bridge bottom, simplified Continuous Box Girder Bridge bottom prestressed reinforcement stretch-draw anchor construction technology, second-degree parabola coverboard profile meets the linear requirement in bottom of multispan prestressed concrete continuous box girder bridge, and new type of continuous box girder bridge structure stress is reasonable.
Along with developing rapidly of track traffic, it is more and more that the standard of overlength circuit is striden footpath continuous viaduct beam, need carry out the breakthrough innovation reform of the prefabricated assemblingization of Continuous Box Girder Bridge.Adopt assembling saddle hull shape base plate Continuous Box Girder Bridge construction method, need not a large amount of wooden forms and support scaffolding, but the continuous viaduct of the overlength circuit that industrialization is built fast, the construction operation of orbit traffic overhead bridge can fully under wayly carry out, adopt synchronous execution management method therefor, build each viaduct section of overlength circuit in batches.Its design of assembling saddle hull shape base plate Continuous Box Girder Bridge is striden the footpath and is preferably 25 meters～40 meters.
The one-tenth bridge technology of assembling saddle hull shape base plate Continuous Box Girder Bridge is: prefabrication pretensioning prestressed concrete saddle shell base plate at first, lift the saddle shell base plate then to bridge pier, adopt several shape steel bracket that the saddle shell base plate is supported temporarily, so that reduce the selfweight stress of saddle shell base plate.Lifting Wavelike steel webplate and horizontal steel thereof support to place, and the built-in fitting firm welding of Wavelike steel webplate and shape of a saddle coverboard forms integral body, utilizes the web of corrugated sheet steel as Continuous Box Girder Bridge, bears the shearing of Continuous Box Girder Bridge.The concrete diaphragm of cast in situs Continuous Box Girder Bridge, the space globality of reinforcement Continuous Box Girder Bridge, the torsional rigidity of raising saddle base plate Continuous Box Girder Bridge, concreting case beam No. zero sections guarantees the partial pressing ability of bridge construction at the bearing place.Utilize the saddle shell base plate as interim operating platform, adopt the construction formwork of the matured product of profiled sheet class as case beam concrete roof, assembling reinforcement, bury the prestressed reinforcement bellows underground, the segmented Continuous Box Girder Bridge concrete roof of building, wait for that its concrete knot is hard after, stretch-draw anchor concrete roof prestressed reinforcement, pressure grouting is built until the span centre sections and to be closed up.At last, stretch-draw external prestressing cable wire carries out deck paving, and railing is installed, and forms novel assembling Continuous Box Girder Bridge.
Beneficial effect: the utility model compared with prior art has the following advantages:
The track traffic continuous box girder viaduct demand of overlength circuit is increasing, adopts industrialization assembly construction standard to stride the footpath continuous viaduct, is the important development direction of bridge construction innovation.The utility model utilization pretensioning prestressed concrete shape of a saddle coverboard is as the base plate member of box girder bridge, utilize the web of corrugated sheet steel as box girder bridge, the segmented Continuous Box Girder Bridge concrete roof of building, form a kind of novel assembling saddle hull shape base plate Continuous Box Girder Bridge, have advantages such as assembly construction speed is fast, erection without scaffolding, driving is comfortable, cost is low.
Compare with traditional Cast-in-Situ Continuous Beam bridge, adopt prefabricated pretensioning prestressed concrete shape of a saddle coverboard to replace case beam concrete cast-in-situ base plate, the interim operation platform of saddle shell base plate double as, can reduce the support scaffolding consumption, can save wooden form in a large number, reduce the engineering quantity of poured in place concrete.Adopt assembling saddle hull shape base plate Continuous Box Girder Bridge construction method, owing to need not a large amount of wooden forms and support scaffolding, the construction operation of the orbit traffic overhead bridge of overlength circuit can fully under wayly carry out, can adopt synchronous execution management method therefor, build each viaduct section of overlength circuit in batches.
Prestressed reinforcement in the saddle coverboard can be used as the bottom prestressed reinforcement of Continuous Box Girder Bridge, reform the prestressed stretch-draw anchor job practices of box girder bridge bottom, simplified Continuous Box Girder Bridge bottom prestressed reinforcement stretch-draw anchor construction technology, reduced prestressed reinforcement stretch-draw anchor site operation workload, the straight-line prestressed muscle of base plate has been avoided the downward radial load of variable cross-section box girder bridge span centre positive bending moment base plate curve prestressed cable, unfavorable stress and the concurrent disease thereof of having avoided curve presstressed reinforcing steel radial load to cause.
Wavelike steel webplate and the supporting use of saddle hull shape base plate, build novel assembling Continuous Box Girder Bridge, have complementary advantages, form the prestressed concrete combined box beam bridge, can improve the shear resistance of Continuous Box Girder Bridge, further accelerate speed of application, reduce the site operation workload, alleviate deadweight, avoid the concrete web oblique crack, reach the rapid construction effect of assembling Continuous Box Girder Bridge.
Adopt the segmented concrete roof technology of building, can guarantee the bridge deck structure water resistance of Continuous Box Girder Bridge, can utilize the prestressed concrete boom segments case joist support load working load of construction in advance, alleviate the stress of saddle hull shape base plate, make things convenient for the prestressed reinforcement anchoring construction of concrete roof, helped improving the globality of assembling continuous box girder bridge construction.
Assembling saddle hull shape base plate Continuous Box Girder Bridge is medium and small breakthrough innovation of striding footpath Continuous Box Girder Bridge construction technology, realized the quick assembly construction continuous viaduct of industrialization, can apply to widely in bridge on highway, high-speed railway bridge, rail traffic bridge and the municipal viaduct project, especially be fit to the orbit traffic overhead bridge that standard is striden directly many and mileage overlength.
Description of drawings
Fig. 1 is the horizontal section schematic diagram of the utility model assembling saddle hull shape base plate Continuous Box Girder Bridge;
Fig. 2 is the vertical profile elevational schematic view of the utility model assembling saddle hull shape base plate Continuous Box Girder Bridge;
Fig. 3 is the sections schematic three dimensional views of the utility model assembling saddle hull shape base plate Continuous Box Girder Bridge;
Fig. 4 is the full-bridge schematic three dimensional views of the utility model assembling saddle hull shape base plate Continuous Box Girder Bridge;
Fig. 5 is the vertical section schematic three dimensional views of the utility model assembling saddle hull shape base plate Continuous Box Girder Bridge.
Have among the figure: saddle hull shape base plate 1; Collar tie beam 2 bears down on one: Wavelike steel webplate 3; Column peg 4; Prestressed concrete top board 5; Concrete diaphragm: 6; External prestressing muscle 7, concrete box girder No. zero sections 8.
The specific embodiment
Below in conjunction with embodiment and Figure of description the utility model is the most further specified.
Embodiment 1:
Assembling saddle hull shape base plate Continuous Box Girder Bridge of the present utility model is made of saddle hull shape plate 1, the collar tie beam 2 that bears down on one, Wavelike steel webplate 3, column peg 4, prestressed concrete top board 5, concrete diaphragm 6, external prestressing muscle 7 and concrete box girder No. zero sections 8.Saddle hull shape base plate 1 is prefabricated pre-tensioning system efficient prestressed concrete shape of a saddle coverboard, the transverse ends upside of saddle hull shape base plate 1 is connected with the collar tie beam 2 that bears down on one respectively, base plate member as Continuous Box Girder Bridge, a Wavelike steel webplate 3 is set between the top of each collar tie beam 2 that bears down on one and the prestressed concrete top board 5, the lower end of Wavelike steel webplate 3 is connected with the top of the collar tie beam 2 that bears down on one, the upper end is connected with prestressed concrete top board 5 by column peg 4, and prestressed concrete top board 5 adopts segmented cast-in-place method moulding.5 road concrete diaphragms 6 are set in each bridge span hole of Continuous Box Girder Bridge, lay respectively at span centre, two quartile places and two end bearing places, concrete diaphragm 6 upsides are connected with the bottom surface of prestressed concrete top board 5, downside is connected with the upper side of saddle hull shape base plate 1, and the left and right sides is connected with a Wavelike steel webplate 3 respectively.Also be provided with the external prestressing muscle 7 of broken line shape longitudinally in continuous box girder, external prestressing muscle 7 passes and is anchored on the concrete diaphragm 6.At the bearing place, concrete box girder No. zero sections 8 of cast in situs is set, adjacent with it Wavelike steel webplate 3 is wrapped.
Embodiment 2:
A kind of method of building assembling saddle hull shape base plate Continuous Box Girder Bridge may further comprise the steps:
The first step, the poured in place concrete bridge pier, the pot bearing of Continuous Box Girder Bridge is installed, lift prefabricate saddle hull shape base plate 1 of the collar tie beam 2 that bears down on one that has to bridge pier, and adopt several shape steel bracket to support saddle hull shape base plate 1 temporarily, be welded to connect the reserved steel bar of saddle hull shape base plate 1 end, bearing place, build the seam crossing concrete;
Second step, lifting Wavelike steel webplate 3 puts in place, with about the lower end of two Wavelike steel webplates 3 firmly weld with the top pre-embedded steel slab of collar tie beam 2 of bearing down on one, double column peg 4 firmly is welded on the top flange end face of Wavelike steel webplate 3, interim laterally steel is installed between adjacent two Wavelike steel webplates 3 is supported, constitute stable steel frame;
The 3rd step, assembling reinforcement, the concrete diaphragm 6 of cast in situs Continuous Box Girder Bridge, the torsional rigidity of raising saddle base plate Continuous Box Girder Bridge, concreting case beam No. zero sections 8 guarantees the partial pressing ability of bridge construction at the bearing place.
The 4th step, lay template, assembling reinforcement, pre-buried prestressed reinforcement bellows, segmented cast prestressed concrete top board 5, after the concrete knot is hard, the prestressed reinforcement of stretch-draw anchor prestressed concrete top board 5, the slip casting of bellows internal pressure;
In the 5th step, the external prestressing muscle 7 of stretch-draw broken line shape is anchored on the concrete diaphragm 6, and the bridge floor of mating formation is installed railing, forms novel assembling saddle hull shape base plate Continuous Box Girder Bridge.
Embodiment 3:
Certain orbit traffic overhead bridge, employing is striden one continuous beam viaduct by a plurality of seven and is formed, adopt 7 to stride * 30 meters prestressed concrete continuous beam form of structure, the case beam adopts the single box single chamber section form, in order to accelerate speed of application and to reduce cost, adopt assembling saddle hull shape base plate continuous box girder bridge construction method.Case beam base plate is wide to be 4 meters, and bridge floor is wide to be 7 meters, and deck-molding is 2.5 meters, and vehicular load is highway-I level.Select for use pretensioning prestressed concrete saddle plate as case beam base plate, prefabricated saddle plate adopts C60 concreting, span is 30 meters, plate is wide to be 4 meters, and saddle hull shape plate height is 1200m, and the saddle base plate is for becoming the thickness of slab cross section, the span centre thickness of slab is 150mm, bearing place thickness of slab is 350mm, and coverboard parabola rise is 400mm, 36 7 φ 5 steel strand of interior configuration.The saddle plate collar tie beam cross section of bearing down on one is a rectangle, adopts 300 * 500mm cross section, and the collar tie beam that bears down on one is with prefabricated moulding, 12 φ 20 reinforcing bars of interior configuration, the φ 10@150 compound stirrup of building of saddle plate.It is 1200mm that Wavelike steel webplate adopts wavelength, wave height 200mm, and straight plate section horizontal length is 320mm, the tilted plate section projected length is 280mm, the thick 12mm of steel plate, the firm web height of waveform is 900～1300mm, the firm web of waveform pushes up every side and 2 row's φ 20 column pegs are set are used as shear connector.The prestressed concrete top board adopts C50 to build, top board 300mm thickness, and top board is divided into 10 strands at 70 7 φ 5 steel strand of bearing place configuration, per share 7, adopts diameter 80mm bellows.Span centre, quartile go out concrete tabula thickness of slab 200mm, the concrete tabula thickness of slab 400mm of bearing place.The external prestressing reinforcing bar adopts broken line to arrange, adopts 18 7 φ 5 non-bending steel cables, is divided into 3 bursts of stretch-draw.No. zero the concrete box girder segment adopts C50 to build, and the web wall thickness is 350mm, and No. zero concrete box girder segment length at limit bearing place is 800mm, and intermediate support place sections length is 1600mm.Studies show that assembling saddle hull shape base plate Continuous Box Girder Bridge has stressed favorable working performance, have advantages such as construction speed is fast, erection without scaffolding, driving is comfortable, cost is low.
Below the utility model is illustrated in more detail:
Saddle hull shape base plate Continuous Box Girder Bridge is a kind of form of structure of assembling combination box beam bridge, adopt prestressed concrete shape of a saddle shell-slab to replace the prestressed concrete base slab of traditional Continuous Box Girder Bridge, saddle shell base plate double as construction operation platform, wooden form and support scaffolding when having removed traditional continuous box girder bridge construction from, simplified the construction technology of Continuous Box Girder Bridge, improve the stress performance of Continuous Box Girder Bridge, have advantages such as assembly construction speed is fast, in light weight, handsome in appearance, cost is low.Construction technology process is: build bridge pier, and------lifting saddle plate is in place, and---Wavelike steel webplate is installed, and---------the segmented case back plate of building---subsection tension top board prestressed reinforcement---deck paving is installed railing to the concreting diaphragm to prefabricated saddle shell base plate to lay the profiled sheet template.In the operation of construction assembled saddle hull shape base plate Continuous Box Girder Bridge, must be noted that and promptly grab thin each link that concrete key point for process is as follows:
(1) making of saddle plate and lifting
Pretensioning prestressed concrete saddle shaped coverboard is a kind of prefabricated thin shell structures, and shell thickness only is about one of two percentages of its span, and domestic factory building saddle plate span commonly used is 15～36m, and the coverboard width is 3～5m, thickness of slab 80～120mm.Advantages such as that saddle shell-slab structure has is big from heavy and light, material saving, span, good looking appearance, be widely used in the roof structure of industrial construction factory building, up to the present in Shanghai, ground such as Beijing, Jiangsu, Anhui successfully applied more than 100 ten thousand square metres.China has had very high design, construction level, has formed distinctive saddle board production technology of a tackling and equipment, has published the application specific standard atlas, and has obtained using more widely in actual engineering.
The used saddle plate of assembling Continuous Box Girder Bridge is striden directly bigger, and it is bigger to bear vehicular load, should suitably increase coverboard thickness, and the low relaxed prestress steel strand that should adopt 7 strands is as prestressed reinforcement, so that increase the coverboard structural-load-carrying capacity.Saddle hull shape top should be provided with the concrete collar tie beam that bears down on one, and strengthens the resistance to compression service behaviour in coverboard concrete compression district, and pre-embedded steel slab is set, so that be welded to connect with corrugated steel web.Bridge should adopt thickening degree form with the thickness of slab of saddle plate, should increase coverboard thickness gradually to the bridge pad zone from bridge span, so that satisfy the structural concrete pressure zone cross-sectional strength requirement in Continuous Box Girder Bridge negative moment of backing plate zone.
At the bridge pier place, the pot bearing and the pressure-bearing steel plate of Continuous Box Girder Bridge is installed, bearing temporary consolidation device is set.Adopt large-scale lifting appliance, lifting saddle hull shape plate is shelved on the bridge pier bearing pad.Central region at the saddle coverboard adopts 1～2 road shape steel bracket to support the saddle coverboard temporarily, so that reduce saddle coverboard concrete selfweight stress, so that bear the construction temporary load(ing).Be welded to connect the reserved steel bar of bearing seam crossing saddle hull shape bottom end, build the seam crossing concrete, realize the Program for structural Transformation of the simply supported slab of saddle coverboard structure to continuous slab.
(2) Wavelike steel webplate is installed
Wavelike steel webplate prestressed concrete composite beam bridge is the novel reinforced concrete composite structure form of a kind of economy, efficient, easy construction, adopt the thick Wavelike steel webplate in the 10mm left and right sides to replace the thick concrete web of 30～80cm, Wavelike steel webplate is vertically because the wrinkle effect, its vertical tension presses rigidity little, so can be to think that Wavelike steel webplate does not bear axial force, the prestressed concrete top board of corrugated steel web plate composite box girder, the effect of base plate opposing moment of flexure, Wavelike steel webplate is born shearing.That Wavelike steel webplate prestressed concrete composite beam bridge has is fast from heavy and light, economical with materials, speed of application, avoid the web crack, durability is strong and advantage such as handsome in appearance, Wavelike steel webplate prestressed concrete composite beam bridge has at home and abroad been popularized in an all-round way and has been used, and has obtained good economic effect and social benefit.
Assembling saddle hull shape base plate Continuous Box Girder Bridge adopts Wavelike steel webplate, has passed on the advantage of Wavelike steel webplate prestressed concrete composite beam bridge, has realized the assembling characteristic of saddle hull shape floor box beam bridge, the bridge construction quick construction.At the construction field (site), the segmental hoisting Wavelike steel webplate puts in place, and the welding Wavelike steel webplate forms integral body, interim laterally steel is installed is supported.
The supporting capacity of being directly connected to whole bridge for the portion of closing of box girder bridge Wavelike steel webplate and concrete roof and floor is a very crucial sport technique segment in the design Wavelike steel webplate box girder bridge.Must consider that can the horizontal shear force that steel and concrete material take place be effectively controlled between the two for the design of the portion of closing, when guaranteeing the bridge operation, can not produce relative displacement between two kinds of materials.The junction surface of Wavelike steel webplate and concrete top, base plate must be according to designing requirement, enough peg connecting keys, welded reinforcement connecting key, shaped steel connecting key is set or runs through the reinforcing bar connecting key of Wavelike steel webplate, guarantees the stressed reliability at junction surface.
At Wavelike steel webplate outside welding steel tie, template is laid in assembling reinforcement, at span centre, quartile and bearing place, and the concrete diaphragm of cast in situs Continuous Box Girder Bridge, the torsional rigidity of raising saddle base plate Continuous Box Girder Bridge.At the bearing place, concreting case beam No. zero sections wraps adjacent with it Wavelike steel webplate, guarantees the partial pressing ability of bridge construction at the bearing place, the Wavelike steel webplate that guarantees continuous box girder bridge seat place is not corroded, and improves the durability of Continuous Box Girder Bridge.
(3) concreting top board
Assembling saddle hull shape base plate Continuous Box Girder Bridge concrete roof is the important structure part, in bearing near zone concrete roof, prestressed reinforcement should be set, so that the opposing negative moment of backing plate, in the span centre zone, concrete roof should provide enough pressure zone areas, so that opposing span centre positive bending moment.
Build box girder bridge concrete roof construction technology in order to improve traditional modulus method that hangs, can support in several triangle steel of Wavelike steel webplate arranged outside, the Wavelike steel webplate inboard is provided with multiple tracks steel work drawknot beam, and designing requirement is installed, lay profiled sheet, form case beam concrete roof operation platform.Wavelike steel webplate welded top shearing resistance peg guarantees that Wavelike steel webplate is connected reliably with case beam concrete roof.
At the construction field (site), the assembling reinforcement skeleton is buried bellows underground, arrangement prestress steel bundle, case beam concrete roof is built in segmentation, treat that concrete strength reaches designing requirement after, stretch-draw prestressing force steel bundle adopts the ground tackle anchoring.Then, repeat next section box girder concrete roof pouring construction, concrete curing, the stretch-draw anchor prestressed strand, so circulation directly ends span centre and closes up the sections construction and finish.Adopt similar Continuous Box Girder Bridge cantilever pouring method, segmented concreting top board, be for reasonable Arrangement longitudinal prestressing steel bundle, make things convenient for the anchoring construction of longitudinal prestressing, the cantilever case beam that forms in advance can be born working load simultaneously, reduce the working load of shape of a saddle coverboard, reduce shape of a saddle coverboard construction stage tensile stress.
After new type of continuous case back plate is built and finished, can carry out the construction of external prestressing stretch-draw anchor, remove temporary support, carry out the Continuous Box Girder Bridge Program for structural Transformation.
(4) deck paving is installed railing
After assembling saddle hull shape base plate Continuous Box Girder Bridge main body construction is finished, carry out the shrinkage joint installation, bridge railing is installed, carry out the bituminous concrete deck paving, improve deck drainage system, carry out bridge paint, coating decoration, organizing construction checks and accepts, and is open to traffic.
Claims (5)
1. assembling saddle hull shape base plate Continuous Box Girder Bridge, it is characterized in that, this Continuous Box Girder Bridge comprises the saddle hull shape base plate (1) that connects setting from bottom to up successively, collar tie beam (2) bears down on one, Wavelike steel webplate (3), column peg (4) and prestressed concrete top board (5), the transverse ends upside of saddle hull shape base plate (1) is connected with the collar tie beam that bears down on one (2) respectively, base plate member as Continuous Box Girder Bridge, between the top of each collar tie beam that bears down on one (2) and the prestressed concrete top board (5) Wavelike steel webplate (3) is set, the lower end of Wavelike steel webplate (3) is connected with the top of the collar tie beam that bears down on one (2), the upper end is connected with prestressed concrete top board (5) by column peg (4), prestressed concrete top board (5) adopts segmented cast-in-place method moulding, be horizontally arranged with concrete diaphragm (6) in the continuous box girder, also be provided with the external prestressing muscle (7) of broken line shape longitudinally in continuous box girder, described external prestressing muscle (7) passes and is anchored on the concrete diaphragm (6).
2. assembling saddle hull shape base plate Continuous Box Girder Bridge according to claim 1 is characterized in that, 5 road concrete diaphragms (6) are set in each bridge span hole of described Continuous Box Girder Bridge, lays respectively at span centre, two quartile places and two end bearing places.
3. assembling saddle hull shape base plate Continuous Box Girder Bridge according to claim 1 and 2, it is characterized in that, described concrete diaphragm (6) upside is connected with the bottom surface of prestressed concrete top board (5), downside is connected with the upper side of saddle hull shape base plate (1), and the left and right sides is connected with a Wavelike steel webplate (3) respectively.
4. assembling saddle hull shape base plate Continuous Box Girder Bridge according to claim 1 and 2, it is characterized in that this Continuous Box Girder Bridge comprises that also the concrete web of the concrete box girder described concrete box girder of No. zero sections (8) No. zero sections (8) that is arranged on the beam bridge standoff region wraps adjacent with it Wavelike steel webplate (3).
5. assembling saddle hull shape base plate Continuous Box Girder Bridge according to claim 1 and 2 is characterized in that, described saddle hull shape base plate (1) is prefabricated pre-tensioning system efficient prestressed concrete shape of a saddle coverboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220746813 CN203080397U (en) | 2012-12-31 | 2012-12-31 | Assembly-type saddle-shell-shaped bottom plate continuous box girder bridge |
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| CN 201220746813 CN203080397U (en) | 2012-12-31 | 2012-12-31 | Assembly-type saddle-shell-shaped bottom plate continuous box girder bridge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046463A (en) * | 2012-12-31 | 2013-04-17 | 东南大学 | Assembly type saddle-shell-shaped bottom plate continuous box girder bridge and construction method thereof |
| CN105155401A (en) * | 2015-08-24 | 2015-12-16 | 安徽省交通规划设计研究总院股份有限公司 | Bridge total external prestress concrete segment spliced light thin-walled box girder |
-
2012
- 2012-12-31 CN CN 201220746813 patent/CN203080397U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046463A (en) * | 2012-12-31 | 2013-04-17 | 东南大学 | Assembly type saddle-shell-shaped bottom plate continuous box girder bridge and construction method thereof |
| CN103046463B (en) * | 2012-12-31 | 2014-10-29 | 东南大学 | Assembly type saddle-shell-shaped bottom plate continuous box girder bridge and construction method thereof |
| CN105155401A (en) * | 2015-08-24 | 2015-12-16 | 安徽省交通规划设计研究总院股份有限公司 | Bridge total external prestress concrete segment spliced light thin-walled box girder |
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