CN103696355B - The light-duty combined bridge structure of a kind of superhigh tenacity concrete slab-girder steel - Google Patents
The light-duty combined bridge structure of a kind of superhigh tenacity concrete slab-girder steel Download PDFInfo
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Abstract
The invention discloses the light-duty combined bridge structure of a kind of superhigh tenacity concrete slab-girder steel, this combined bridge structure forms primarily of steel longeron, gooseneck and superhigh tenacity concrete slab; Steel longeron and gooseneck are interconnected to constitute the girder of combined bridge structure, and superhigh tenacity concrete slab forms primarily of superhigh tenacity concreting, are furnished with in length and breadth to steel mesh reinforcement in superhigh tenacity concrete slab; The bonding surface of the top flange plate of the bonding surface of the top flange plate of superhigh tenacity concrete slab and steel longeron, superhigh tenacity concrete slab and gooseneck is provided with shear connector.Combined bridge structure of the present invention has from advantages such as heavy and light, tensile strength excellence and good endurance, can significantly improve the rigidity of structure, reduce concrete shrinkage and creep impact, reduce concrete slab seam quantity, effectively prevent concrete slab crack from producing.
Description
Technical field
The present invention relates to a kind of novel bridge construction, particularly the light-duty Composite Steel-Concrete Bridges structure of one.
Background technology
Steel-concrete composite beam bridge is that girder steel and concrete slab are connected into overall jointly stressed bridge construction form by shear connector.Relative to steel bridge, Composite Steel-Concrete Bridges second moment of area and anti-bending bearing capacity are significantly increased, and the enhancing of concrete slab to girder steel stability makes steel structure material performance be given full play to, and significantly reduces girder steel steel using amount, decrease Master Cost, there is good economy.Compared with concrete-bridge, combined bridge have physical dimension little, from heavy and light, the advantages such as structure ductility is good, excellent earthquake resistance, foundation cost reduction.Meanwhile, the reduction of superstructure deck-molding, is conducive to increasing under-clearance and reducing bridge elevation, makes construction profile more very thin simultaneously, enhance the landscape effect of bridge.
Although Composite Steel-Concrete Bridges mechanical property and workability are well, also there are some problems.First, in traditional Composite Steel-Concrete Bridges, because concrete tensile strength is lower, in order to resist wheel-load stress, concrete bridge deck plate thickness comparatively large (usual average thickness is more than 26 centimetres), the dead load of structure is comparatively large, and increases gradually along with across footpath, and dead load accounts for bearing capacity proportion and strengthens further.Secondly, under positive bending moment effect, concrete slab is in longitudinal pressured state, and concrete slab resists dead load and mobile load as the compression flange co-operation of combined bridge, well stressed; But under hogging moment effect, concrete slab is in tension state, and concrete material tensile strength is low, bridge deck are easy to cracking.Again, as depicted in figs. 1 and 2, common Composite Steel-Concrete Bridges causes the impact of excessive shrinkage stress in order to reduce concrete slab shrinkage strain by girder steel constraint, general employing prefabricating common concrete (RC) bridge deck 5, deposit after four months and prefabricated for RC bridge deck section 51 be mounted on girder steel, then on girder steel cast-in-place RC bridge deck Cast-in-Situ Segment 52, thus the vertical transverse joint 53 of this type of combined bridge structure is a lot, and seam is structural weak position, easily ftracture.Finally, after the concrete slab crack in tension of Composite Steel-Concrete Bridges hogging moment area (particularly seam crossing), be easy to cause the problems such as the infiltration of corrosion of steel bar in concrete slab, girder and steel work get rusty in operational phase with material property deterioration, the durability of bridge faces huge hidden danger, is difficult to the requirement meeting large span bridge.Therefore, how to improve mechanical property and the construction technology of combined bridge structural concrete bridge deck, become a problem in the urgent need to address in Composite Steel-Concrete Bridges design and construction.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, for steel concrete combined bridge provide a kind of light-duty, the rigidity of structure and tensile strength can be improved, concrete shrinkage and creep impact can be reduced, reduce concrete slab seam quantity, effectively prevent concrete slab crack from producing and the concrete slab of good endurance.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is: the light-duty combined bridge structure of a kind of superhigh tenacity concrete slab-girder steel, described combined bridge structure is primarily of steel longeron, gooseneck and superhigh tenacity concrete (SuperToughnessConcrete is called for short STC) bridge deck composition; Described steel longeron and gooseneck be interconnected to constitute combined bridge structure girder (between steel longeron with described gooseneck by welding, the mode such as bolt is connected, gooseneck preferably adopts double groove weldering to be connected with steel longeron), described superhigh tenacity concrete slab forms primarily of superhigh tenacity concreting, is furnished with in length and breadth to steel mesh reinforcement in superhigh tenacity concrete slab; The bonding surface of described superhigh tenacity concrete slab and the top flange plate of steel longeron, superhigh tenacity concrete slab and the bonding surface of the top flange plate of gooseneck are provided with shear connector, and to make it be connected in aggregates.The present invention proposes the light-duty combined bridge structure of this superhigh tenacity concrete slab-girder steel and can be used in the beam bridge of large span, the engineering practice such as cable stayed bridge and suspension bridge.
In the above-mentioned light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel, described superhigh tenacity concrete can be RPC, very-high performance fibre reinforced concrete, closely knit arrangement of reinforcement cement-base composite material etc., but is preferably the RPC of modification.The RPC of this modification mainly refers in RPC the copper facing high-strength steel fiber (steel fibre tensile strength is more than 2800MPa) being mixed with different size and/or profile.This preferred modified active powder concrete effectively can improve toughness and the examining tensile behavior of STC bridge deck.
In the above-mentioned light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel, the copper facing high-strength steel fiber of two or more different size or profile in described superhigh tenacity concrete, can be mixed, to improve toughness and the examining tensile behavior of STC bridge deck; But preferred, the length of described copper facing high-strength steel fiber and the ratio (i.e. draw ratio) of diameter control to be 70 ~ 100; The profile of described copper facing high-strength steel fiber comprises two or more (see Fig. 3) in straight shape, band end hook, twisted shape.Preferred, copper facing high-strength steel fiber A and copper facing high-strength steel fiber B two kinds selected by described copper facing high-strength steel fiber, described copper facing high-strength steel fiber A and described copper facing high-strength steel fiber B is any one group in following three kinds of combinations: combination one: described copper facing high-strength steel fiber A refers to the band end hook copper facing high-strength steel fiber of length 14mm, diameter 0.2mm, and described copper facing high-strength steel fiber B refers to the straight shape copper facing high-strength steel fiber of length 30mm, diameter 0.3mm; The band end hook copper facing high-strength steel fiber that combination two: described copper facing high-strength steel fiber A refers to length 14mm, diameter 0.2mm, described copper facing high-strength steel fiber B refer to length 30mm, diameter 0.3mm through the cold rolling twisted shape copper facing high-strength steel fiber turning round processing; Combination three: described copper facing high-strength steel fiber A refers to the straight shape copper facing high-strength steel fiber of length 14mm, diameter 0.2mm, and described copper facing high-strength steel fiber B refers to the band end hook copper facing high-strength steel fiber of length 30mm, diameter 0.3mm; The volume ratio of mixing of described copper facing high-strength steel fiber A and copper facing high-strength steel fiber B controls 0.5: 1 ~ 1: 0.5, and the cumulative volume volume of described copper facing high-strength steel fiber is 2% ~ 4%.The copper facing high-strength steel fiber optimized after grating can improve volume volume, and ensure the workability of STC material, improves bending tensile strength and toughness.Adopt and optimize the deformed steel fiber after grating and under the prerequisite ensureing workability and mechanical property, volume volume can also be reduced, and improve the bending tensile strength of STC material, toughness and construction workability.After deformed steel fiber after described superhigh tenacity concrete employing grating, energy to failure is 22kJ/m
2~ 45kJ/m
2, ultimate elongation is up to 5200 × 10
-6~ 6500 × 10
-6.
In the above-mentioned light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel, preferably, the shrinkage character of asbestos tailings acidity leaching slag superfine powder in order to modification STC bridge deck is mixed with in described superhigh tenacity concrete; The average grain diameter of described asbestos tailings acidity leaching slag superfine powder is 2 μm ~ 5 μm, and the incorporation of asbestos tailings acidity leaching slag superfine powder is 10% ~ 25% (mass fraction) of cementitious material in superhigh tenacity concrete component (comprising cement, silicon ash isoreactivity material).Mix asbestos tailings acidity leaching slag superfine powder modified, because superfine powder particle is thin, proportioning content is high, and this makes the self-constriction of STC material reduce further, and early strength is significantly improved.
In the above-mentioned light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel, described steel longeron both can be plate girder, also can be the carriageway plate (can see Figure 10, Figure 12 and Figure 13) of the steel girders such as plate girder, steel box-girder and Steel Truss Beam; Described carriageway plate and steel girder by welding, the mode such as bolt is connected.Described gooseneck can be truss-like or steel flanged beam sway bracing; Described truss-like sway bracing comprises the girder trusses such as K type, X-type (can respectively see Figure 14 and Figure 15), described steel flanged beam sway bracing comprises the steel flanged beam crossbeams such as I type, I shape, and its top flange plate both can be contour with steel longeron top flange plate, also can lower than the top flange plate of steel longeron (can respectively see Figure 16 and Figure 17).In the present invention, described gooseneck is preferably the contour I shape steel flanged beam sway bracing in top flange and the steel longeron edge of a wing, so that support STC bridge deck and reduce bridge deck across footpath, contact surface needed for the welding of more shear connectors is provided simultaneously, increases shear connector quantity and improve shear-carrying capacity.
In the above-mentioned light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel, preferred, described gooseneck is along bridge longitudinally intensive layout, intensive layout preferably refers to that the spacing of gooseneck is 1/3 ~ 1/2 or 3m ~ 6m of steel girder space, significantly can reduce the internal force of bridge deck under wheel load effect like this.When steel longeron is the less plate girder of spacing, gooseneck preferably gets 1/3 ~ 1/2 of steel girder space in the spacing of longitudinal direction; When steel longeron is the steel box-girder or Steel Truss Beam that spacing is larger, gooseneck preferably gets 3m ~ 6m in the spacing of longitudinal direction, significantly can reduce the internal force of bridge deck under wheel load effect like this.
In the above-mentioned light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel, described shear connector comprises socket cap WELDING STUDS, welding in length and breadth to steel mesh reinforcement, channel-section steel, open pore steel plate (PBL shear connector), angle steel, L-type steel, bent-up bar, anchor ring and frictional high-strength bolts etc., is preferably socket cap WELDING STUDS and PBL shear connector.
In the above-mentioned light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel, preferably, the thinner thickness of described STC bridge deck, preferably 8cm ~ 16cm is got in the present invention, it is only 1/4 ~ 1/2 of common Composite Steel-Concrete Bridges concrete bridge deck plate thickness, dead load is light, structure opposing load validity and span ability large; Also be provided with along bridge vertical and horizontal in length and breadth to steel mesh reinforcement in described STC bridge deck, the one-way reinforcement rate in length and breadth to steel mesh reinforcement is preferably 3% ~ 6%.
In the above-mentioned light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel, preferably, it is shaping that described superhigh tenacity concrete have passed through high temperature steam curing, its shrinkage and creep almost all completes in steam-cured process, later stage shrinkage and creep is little, and thus the distortion of STC Material shrinkage is very little by steel plate effect of constraint value; Therefore, STC bridge deck directly can be cast on steel girder in the present invention, and can arrange transverse joint between longer longitudinal prefabricated subsection, it is 8m ~ 30m that the spacing of the transverse joint of described superhigh tenacity concrete slab is preferably spacing.Based on this, in the preferred combined bridge structure of the present invention, the seam quantity of combining structure significantly reduces (when even span of bridge is little can full Span Continuous cast STC bridge deck and seam is not set), structure anti-cracking safety and rigidity significantly improve.STC bridge deck in the present invention both can adopt on-the-spot continuous pouring, also can adopt factory normalization precast segment, site assembly the construction technology of cast-in-place wet seam, were preferably segmented prefabricated, the site assembly of factory normalization and the construction technology of cast-in-place wet seam.
In the above-mentioned light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel, preferably, the transverse joint of described STC bridge deck can be arranged on the span centre position between the web top of gooseneck or gooseneck; The local enhancement of gooseneck can be carried out, as widened top board and welding longitudinal stiffener when transverse joint is arranged on the web top of gooseneck; When transverse joint is arranged on the span centre position between gooseneck, this transverse joint place can increase and laterally strengthen steel plate.The transverse joint of described STC bridge deck is more preferably arranged on the span centre position between gooseneck.By carrying out reinforcements process to the position of transverse joint and seam local, not only can reduce the rigidity of stressed, the strengthening increase seam crossing of seam, and substantially can eliminate the risk of STC bridge deck gaping of joints.
Compared with prior art, technical scheme of the present invention possesses following obvious technical advantage:
First, superhigh tenacity concrete slab-girder steel of the present invention light-duty combined bridge structure have employed slim STC bridge deck, its thickness is only 1/4 ~ 1/2 of traditional Composite Steel-Concrete Bridges concrete bridge deck plate thickness, dead load significantly reduces, structure opposing load validity and increase span ability significantly improve, and this makes superhigh tenacity of the present invention concrete slab-girder steel light-duty combined bridge structure become a kind of bridge type with application prospect in Large Span Bridges.
The second, superhigh tenacity concrete slab-girder steel of the present invention light-duty combined bridge structure is compared to common Composite Steel-Concrete Bridges, and it reduces the bridge deck internal force under wheel load effect by arranging intensive gooseneck.
3rd, in the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present invention, it is modified that STC material adopts the steel fibre of different size or profile to be optimized grating, and STC energy to failure can reach 22kJ/m
2~ 45kJ/m
2, ultimate elongation is up to 5200 × 10
-6~ 6500 × 10
-6, relative to the energy to failure 0.12kJ/m of ordinary concrete
2, ultimate tensile strength 60 × 10
-6~ 120 × 10
-6, the tensile strength of STC bridge deck of the present invention is high, toughness large, therefore can bear tensile stress larger in combined bridge concrete slab or stretching strain better, prevents its tensile failure.
4th, modified superhigh tenacity concrete is optimized compared to ordinary concrete in the present invention, the asbestos tailings acidity leaching slag superfine powder of average grain diameter only 2 μm ~ 5 μm is mixed with in component, this superfine powder particle is thin, powder content is high, thus the self-constriction of STC material is little, and ultimate tensile strength is large, significantly improves the shrinkage character of STC bridge deck.
5th, the shrinkage strain of ordinary concrete bridge deck is comparatively large by the impact of girder steel constraint, thus traditional Composite Steel-Concrete Bridges generally adopt free shrink to be out of shape after precast concrete bridge deck, the later stage is cast-in-place seam section on girder steel, and thus vertical transverse joint is a lot.And the shrinkage and creep of STC bridge deck almost all completes in high-temperature steam curing strength derived value process, later stage shrinkage and creep can be ignored, thus in the present invention, the shrinkage strain of STC bridge deck is very little by steel plate effect of constraint value, can be cast directly on girder steel, only transverse joint need be set between prefabricated subsection, thus significantly reducing seam quantity, structure safety against cracking and rigidity comparatively ordinary steel-concrete-bridge are significantly improved.
6th, the vertical transverse joint of common Composite Steel-Concrete Bridges is generally arranged on girder steel support place, and hogging moment is comparatively large, easy crack in tension.And the transverse joint of superhigh tenacity concrete slab-girder steel light-duty combined bridge structure cast-in-place section and prefabricated section can be arranged on tensile stress smaller part between gooseneck flexibly in the present invention, or be arranged on gooseneck top, by by gooseneck local enhancement, its rigidity can be improved, reduce seam crossing stress, thus significantly can reduce the risk of gaping of joints between Cast-in-Situ Segment STC bridge deck and prefabricated section of STC bridge deck.
7th, after the concrete slab crack in tension of common Composite Steel-Concrete Bridges hogging moment area particularly seam crossing, be easy to cause corrosion of steel bar in concrete slab in operational phase with material property deterioration, girder infiltration and steel work such as to get rusty at the problem; And in STC bridge deck in the present invention, be mixed with the deformed steel fiber after optimizing grating, tensile strength is high, toughness is large, tensile stress larger in combined bridge bridge deck and stretching strain can be born, thus effectively can prevent bridge deck particularly seam crossing crack in tension, and STC materials ' durability is excellent, life-span can reach 200 years, can effectively solve the above-mentioned a series of endurance issues caused because material property is degenerated in time.
8th, owing to have employed high-strength and high ductility, ultra-thin light-duty STC bridge deck, the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present invention is than clean steel beam bridge, STC bridge deck make second moment of area enlarge markedly, the rigidity of structure significantly improves, under mobile load, the local amount of deflection of combining structure obviously reduces, and fatigue cracking and the problems such as breakage of mating formation of orthotropic steel bridge deck have not all existed.
9th, superhigh tenacity concrete slab-girder steel of the present invention light-duty combined bridge structure both can have been born overall stressed as steel girder, also directly can bear vehicular load as the carriageway plate of plate girder, steel box-girder and Steel Truss Beam, structure is applied widely, highly versatile.
Tenth, because the STC bridge deck in the present invention form compound section shared external loads with steel longeron and gooseneck on the one hand, provide the effect of contraction of girder steel compression flange, positive bending moment district simultaneously, and the material compressive strength of STC superelevation significantly improves the Compression Stability of girder steel, is conducive to giving full play to of structural performance.
11, in the light-duty combined bridge structure of the present invention's total superhigh tenacity concrete slab-girder steel, steel longeron and gooseneck all form compound beam by shear connector and STC bridge deck, shear connector shear-carrying capacity is high, ensure that STC bridge deck are reliably connected with steel work bonding surface and are not started by drawing.
Finally, the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present invention is easy to factory normalization and produces, and installation quality is good, and speed of application is fast, and operating expenses is low.
To sum up, the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present invention, both had large from heavy and light, structural strength and rigidity, anti-cracking safety is high, whole and part good stability, bridge deck seam are few, switching performance is reliable, easy construction, anti-fatigue performance are good, excellent in te pins of durability and the advantage such as applied widely, also there is great practical value and good economic benefit, especially have broad application prospects on the construction of Composite Steel-Concrete Bridges.
Accompanying drawing explanation
Fig. 1 is the elevation of the Composite Steel-Concrete Bridges structure in background technology.
Fig. 2 is the plan view of the Composite Steel-Concrete Bridges structure in background technology.
Fig. 3 is the steel fibre comparison structure schematic diagram of three kinds of different profiles in the present invention; Wherein (a) represents straight shape steel fibre, and (b) represents band end hook steel fibre, and (c) represents twisted shape steel fibre.
Fig. 4 is the phantom drawing of the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel in the embodiment of the present invention 1.
Fig. 5 is longitudinal facade structures schematic diagram of superhigh tenacity concrete slab-girder steel light-duty combined bridge structure in the embodiment of the present invention 1.
Fig. 6 is longitudinal facade structures schematic diagram of superhigh tenacity concrete slab-girder steel light-duty combined bridge structure in the embodiment of the present invention 2.
Fig. 7 is longitudinal facade structures schematic diagram of superhigh tenacity concrete slab-girder steel light-duty combined bridge structure in the embodiment of the present invention 3.
Fig. 8 is the partial enlarged drawing at C place in Fig. 6.
Fig. 9 is the partial enlarged drawing at D place in Fig. 7.
Figure 10 is the sectional view at A-A place in Fig. 5.
Figure 11 is the profile at B-B place in Fig. 5.
Figure 12 is the transverse sectional view of the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel in the embodiment of the present invention 4.
Figure 13 is that in the embodiment of the present invention, steel longeron is the transverse sectional view of the combined bridge structure of Steel Truss Beam.
Figure 14 is that in the embodiment of the present invention, gooseneck is the transverse sectional view of the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of K type sway bracing.
Figure 15 is that in the embodiment of the present invention, gooseneck is the transverse sectional view of the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of X-type sway bracing.
Figure 16 is for adopting the transverse sectional view of the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of I shape sway bracing (top flange of gooseneck and steel longeron is contour).
Figure 17 is for adopting the transverse sectional view of the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of I shape sway bracing (top flange of gooseneck and steel longeron is not contour).
In order to more clearly represent combined bridge structure, in above-mentioned Fig. 5 ~ Fig. 9, eliminate the transverse reinforcement in STC bridge deck, then eliminate in remaining each transverse sectional view in STC bridge deck in length and breadth to steel mesh reinforcement etc.
Marginal data:
1, steel longeron; 11, steel longeron top flange plate; 12, steel longitudinal-beam web plate; 13, steel longeron bottom wing listrium; 14, steel box-girder base plate; 15, steel stringer sides is to stiffener; 16, web longitudinal I type stiffening rib; 17, base plate longitudinally T-shaped stiffening rib; 18, steel longeron butt weld; 2, gooseneck; 21, gooseneck top flange plate; 22, gooseneck web; 23, gooseneck bottom wing listrium; 24, gooseneck stiffener; 25, top flange plate is widened; 26, top flange plate stiffening rib is widened; 27, partial lateral strengthens steel plate; 3, superhigh tenacity concrete (STC) bridge deck; 31, prefabricated section of STC bridge deck; 32, STC bridge deck Cast-in-Situ Segment; 33, STC prefabricated section of longitudinal reinforcement; 34, the longitudinal connecting reinforcement of STC Cast-in-Situ Segment; 35, transverse joint; 4, shear connector; 5, ordinary concrete bridge deck; 51, prefabricated section of RC bridge deck; 52, RC bridge deck Cast-in-Situ Segment; 53, vertical transverse joint; 6, in length and breadth to steel mesh reinforcement.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment, the preferred technical solution of the present invention is further described, but protection domain not thereby limiting the invention.
Embodiment 1:
As shown in Fig. 4, Fig. 5, Figure 10 and Figure 11, the light-duty combined bridge structure of a kind of superhigh tenacity concrete slab-girder steel of the present invention, this combined bridge structure forms primarily of steel longeron 1, gooseneck 2 and superhigh tenacity concrete slab 3; Steel longeron 1 and gooseneck 2 are interconnected to constitute the steel girder of combined bridge structure.Steel longeron 1 in the present embodiment adopts i shaped steel plate-girder, comprises steel longeron top flange plate 11, steel longitudinal-beam web plate 12 and steel longeron bottom wing listrium 13, steel longeron 1 is also provided with steel stringer sides to stiffener 15; Gooseneck 2 adopts steel flanged beam i-shape steel beam, and comprise gooseneck top flange plate 21, gooseneck web 22 and gooseneck bottom wing listrium 23, gooseneck web 22 is provided with gooseneck stiffener 24; Steel longeron top flange plate 11 in the present embodiment is contour with gooseneck top flange plate 21.Gooseneck 2 longitudinally adopts intensive arrangement along bridge, and its spacing is 1/2 of steel longeron 1 spacing; Gooseneck 2 adopts double groove weldering to be connected with steel longeron 1.Superhigh tenacity concrete slab 3 forms primarily of superhigh tenacity concreting, and the thickness of superhigh tenacity concrete slab 3 is 12cm, and be furnished with in length and breadth to steel mesh reinforcement 6 in superhigh tenacity concrete slab 3, one-way reinforcement rate controls 3% ~ 6%.The bonding surface of superhigh tenacity concrete slab 3 and steel longeron top flange plate 11, superhigh tenacity concrete slab 3 and the bonding surface of gooseneck top flange plate 21 are provided with shear connector 4 (i.e. shear connector), and to make it be connected in aggregates.Shear connector 4 in the present embodiment adopts socket cap peg.
In the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present embodiment, superhigh tenacity concrete is the RPC of modification, and its conventional constituents is cement, silicon ash, fine sand, quartzy pulverized powder, water reducing agent, early strength admixture and water etc.But the modified active powder concrete of the present embodiment refers in RPC that the copper facing high-strength steel fiber A and copper facing high-strength steel fiber B that are mixed with two kinds of different sizes and different profile are in order to improve toughness and the examining tensile behavior of STC bridge deck especially.Copper facing high-strength steel fiber A refers to band end hook (end belt crotch) the copper facing high-strength steel fiber of length 14mm, diameter 0.2mm (draw ratio 70), and copper facing high-strength steel fiber B refers to the straight shape copper facing high-strength steel fiber of length 30mm, diameter 0.3mm (draw ratio 100).Copper facing high-strength steel fiber A accounts for 2% of STC material volume volume, and the cumulative volume volume that copper facing high-strength steel fiber B accounts for 1.5%, two kinds of copper facing high-strength steel fibers of STC material volume volume is 3.5%.
The shrinkage character of asbestos tailings acidity leaching slag superfine powder in order to modification STC bridge deck is also mixed with in the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present embodiment; The average grain diameter of asbestos tailings acidity leaching slag superfine powder is 2 μm ~ 5 μm, and the incorporation of asbestos tailings acidity leaching slag superfine powder is 15% of cementitious material in superhigh tenacity concrete component (comprising cement, silicon ash isoreactivity material).Mix asbestos tailings acidity leaching slag superfine powder modified, because superfine powder particle is thin, proportioning content is high, and this makes the self-constriction of STC material reduce further, and early strength is significantly improved.
The superhigh tenacity concrete of the present embodiment to be directly cast on steel girder afterwards by high temperature steam curing (90 DEG C stream curing more than 48 hours) is shaping.Whole superhigh tenacity concrete slab 3 does not arrange transverse joint (such as when getting economic span 20m) on bridge is longitudinal.
Superhigh tenacity concrete slab-girder steel light-duty combined bridge structure of the present embodiment adopts the construction technology of the segmented Prefabricated steel construction of factory normalization, on-the-spot integral and continuous pouring STC bridge deck.In factory, first steel longeron top flange plate 11, steel longitudinal-beam web plate 12 and steel longeron bottom wing listrium 13 is formed the steel longeron 1 of standard knot segment length by welding, gooseneck top flange plate 21, gooseneck web 22 and gooseneck bottom wing listrium 23 is passed through the gooseneck 2 in welding formation standard sections simultaneously, then by welding, steel longeron 1 and gooseneck 2 are formed standard sections steel girder, and weld shear connector 4 on steel longeron top flange plate 11 and gooseneck top flange plate 21.By standard sections weld steel work be transported to bridge on-site hoisting in place after, adopt steel longeron butt weld 18 to be welded piecemeal by adjacent two standard sections steel girders and form bridge entirely across steel work, then frame shuttering making are in length and breadth to steel mesh reinforcement 6, integral and continuous pouring whole across STC bridge floor flaggy 3, form removal after on-the-spot high temperature steam curing STC plate three days formation intensity, completes construction.
Embodiment 2:
As shown in Figure 6 and Figure 8, the light-duty combined bridge structure of a kind of superhigh tenacity concrete slab-girder steel of the present invention, this combined bridge structure forms primarily of steel longeron 1, gooseneck 2 and superhigh tenacity concrete slab 3; Steel longeron 1 and gooseneck 2 are interconnected to constitute the steel girder of combined bridge structure.Steel longeron 1 in the present embodiment adopts i shaped steel plate-girder, comprises steel longeron top flange plate 11, steel longitudinal-beam web plate 12 and steel longeron bottom wing listrium 13, steel longeron 1 is also provided with steel stringer sides to stiffener 15; Gooseneck 2 adopts steel flanged beam i-shape steel beam, and comprise gooseneck top flange plate 21, gooseneck web 22 and gooseneck bottom wing listrium 23, gooseneck web 22 is provided with gooseneck stiffener 24; Steel longeron top flange plate 11 in the present embodiment is contour with gooseneck top flange plate 21.Gooseneck 2 longitudinally adopts intensive arrangement along bridge, and its spacing is 1/2 of steel longeron 1 spacing; Gooseneck 2 adopts double groove weldering to be connected with steel longeron 1.Superhigh tenacity concrete slab 3 forms primarily of superhigh tenacity concreting, and the thickness of superhigh tenacity concrete slab 3 is 12cm, and be furnished with in length and breadth to steel mesh reinforcement 6 in superhigh tenacity concrete slab 3, one-way reinforcement rate controls 3% ~ 6%.The bonding surface of superhigh tenacity concrete slab 3 and steel longeron top flange plate 11, superhigh tenacity concrete slab 3 and the bonding surface of gooseneck top flange plate 21 are provided with shear connector 4 (i.e. shear connector), and to make it be connected in aggregates.Shear connector 4 in the present embodiment adopts socket cap peg.
In the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present embodiment, superhigh tenacity concrete is the RPC of modification, and its conventional constituents is cement, silicon ash, fine sand, quartzy pulverized powder, water reducing agent, early strength admixture and water etc.But the modified active powder concrete of the present embodiment refers in RPC that the copper facing high-strength steel fiber A and copper facing high-strength steel fiber B that are mixed with two kinds of different sizes and different profile are in order to improve toughness and the examining tensile behavior of STC bridge deck especially.Copper facing high-strength steel fiber A refers to band end hook (end belt crotch) the copper facing high-strength steel fiber of length 14mm, diameter 0.2mm (draw ratio 70), copper facing high-strength steel fiber B refer to length 30mm, diameter 0.3mm (draw ratio 100) through cold rolling twisted shape (distortion) the copper facing high-strength steel fiber turning round processing.Copper facing high-strength steel fiber A accounts for 2% of STC material volume volume, and the cumulative volume volume that copper facing high-strength steel fiber B accounts for 1.5%, two kinds of copper facing high-strength steel fibers of STC material volume volume is 3.5%.
The shrinkage character of asbestos tailings acidity leaching slag superfine powder in order to modification STC bridge deck is also mixed with in the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present embodiment; The average grain diameter of asbestos tailings acidity leaching slag superfine powder is 2 μm ~ 5 μm, and the incorporation of asbestos tailings acidity leaching slag superfine powder is 15% of cementitious material in superhigh tenacity concrete component (comprising cement, silicon ash isoreactivity material).Mix asbestos tailings acidity leaching slag superfine powder modified, because superfine powder particle is thin, proportioning content is high, and this makes the self-constriction of STC material reduce further, and early strength is significantly improved.
The superhigh tenacity concrete of the present embodiment to be directly cast on steel girder afterwards by high temperature steam curing (90 DEG C stream curing more than 48 hours) is shaping.
The STC bridge deck transverse joint 35 of the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present embodiment is arranged on above gooseneck web 22, transverse joint spacing is 25m, prefabricated for STC bridge deck section 31 is connected with Cast-in-Situ Segment 32, transverse joint 35 place adopts to be widened top board 25 and welds longitudinal local stiffener 26 by gooseneck 2 end local enhancement, to increase the rigidity of structure of seam crossing, reduce seam crossing stress.
Superhigh tenacity concrete slab-girder steel light-duty combined bridge structure of the present embodiment adopts segmented prefabricated, the site assembly of factory normalization and the construction technology of cast-in-place seam section STC bridge deck.In factory, first steel longeron top flange plate 11, steel longitudinal-beam web plate 12, steel longeron bottom wing listrium 13 and steel stringer sides are formed the steel longeron 1 of standard knot segment length by welding to stiffener 15.Gooseneck top flange plate 21, gooseneck web 22, gooseneck bottom wing listrium 23 and gooseneck stiffener 24 is passed through gooseneck 2 in welding formation standard sections simultaneously, top flange plate 25 being widened in standard sections end (gooseneck), (gooseneck) widen the welding of top flange plate stiffening rib 26, gooseneck web 22 and gooseneck bottom wing listrium 23 and form end gooseneck, then by welding, gooseneck 2 in steel longeron 1, standard sections and sections end gooseneck being connected into standard sections steel girder.Steel longeron top flange plate 11 and gooseneck top flange plate 21 weld shear connector 4, afterwards in the intersegmental shuttering colligation of standard knot in length and breadth to steel mesh reinforcement 6, and reserved STC prefabricated section of longitudinal reinforcement 33 certain length, so that scene and the longitudinal connecting reinforcement 34 of STC Cast-in-Situ Segment connect into entirety.Cast STC bridge deck prefabricated section 31 high temperature steam curing after three days form removal form the light-duty combined bridge structure of STC plate-girder steel of standard sections.The STC of standard sections plate-girder steel light-duty combined bridge structure is transported to on-site hoisting in place after, be connected by the light-duty combined bridge structure of STC plate-girder steel of steel longeron butt weld 18 between sections by adjacent two standard sections, finally lay in length and breadth to steel mesh reinforcement in STC bridge deck Cast-in-Situ Segment 32 place, and longitudinal for STC Cast-in-Situ Segment connecting reinforcement 34 is weldingly connected with STC prefabricated section of longitudinal reinforcement 33 reserved part, high-temperature steam health after cast STC bridge deck Cast-in-Situ Segment 32 inner concrete, after forming intensity, namely the demoulding completes construction.
Embodiment 3:
As shown in figures 7 and 9, the light-duty combined bridge structure of a kind of superhigh tenacity concrete slab-girder steel of the present invention, this combined bridge structure forms primarily of steel longeron 1, gooseneck 2 and superhigh tenacity concrete slab 3; Steel longeron 1 and gooseneck 2 are interconnected to constitute the steel girder of combined bridge structure.Steel longeron 1 in the present embodiment adopts i shaped steel plate-girder, comprises steel longeron top flange plate 11, steel longitudinal-beam web plate 12 and steel longeron bottom wing listrium 13, steel longeron 1 is also provided with steel stringer sides to stiffener 15; Gooseneck 2 adopts steel flanged beam i-shape steel beam, and comprise gooseneck top flange plate 21, gooseneck web 22 and gooseneck bottom wing listrium 23, gooseneck web 22 is provided with gooseneck stiffener 24; Steel longeron top flange plate 11 in the present embodiment is contour with gooseneck top flange plate 21.Gooseneck 2 longitudinally adopts intensive arrangement along bridge, and its spacing is 1/2 of steel longeron 1 spacing; Gooseneck 2 adopts double groove weldering to be connected with steel longeron 1.Superhigh tenacity concrete slab 3 forms primarily of superhigh tenacity concreting, and the thickness of superhigh tenacity concrete slab 3 is 12cm, and be furnished with in length and breadth to steel mesh reinforcement 6 in superhigh tenacity concrete slab 3, one-way reinforcement rate controls 3% ~ 6%.The bonding surface of superhigh tenacity concrete slab 3 and steel longeron top flange plate 11, superhigh tenacity concrete slab 3 and the bonding surface of gooseneck top flange plate 21 are provided with shear connector 4 (i.e. shear connector), and to make it be connected in aggregates.Shear connector 4 in the present embodiment adopts socket cap peg.
In the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present embodiment, superhigh tenacity concrete is the RPC of modification, and its conventional constituents is cement, silicon ash, fine sand, quartzy pulverized powder, water reducing agent, early strength admixture and water etc.But the modified active powder concrete of the present embodiment refers in RPC that the copper facing high-strength steel fiber A and copper facing high-strength steel fiber B that are mixed with two kinds of different sizes and different profile are in order to improve toughness and the examining tensile behavior of STC bridge deck especially.Copper facing high-strength steel fiber A refers to the straight shape copper facing high-strength steel fiber of length 14mm, diameter 0.2mm (draw ratio 70), and copper facing high-strength steel fiber B refers to band end hook (end belt crotch) the copper facing high-strength steel fiber of length 30mm, diameter 0.3mm (draw ratio 100).Copper facing high-strength steel fiber A accounts for 2% of STC material volume volume, and the cumulative volume volume that copper facing high-strength steel fiber B accounts for 1.5%, two kinds of copper facing high-strength steel fibers of STC material volume volume is 3.5%.
The shrinkage character of asbestos tailings acidity leaching slag superfine powder in order to modification STC bridge deck is also mixed with in the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present embodiment; The average grain diameter of asbestos tailings acidity leaching slag superfine powder is 2 μm ~ 5 μm, and the incorporation of asbestos tailings acidity leaching slag superfine powder is 15% of cementitious material in superhigh tenacity concrete component (comprising cement, silicon ash isoreactivity material).Mix asbestos tailings acidity leaching slag superfine powder modified, because superfine powder particle is thin, proportioning content is high, and this makes the self-constriction of STC material reduce further, and early strength is significantly improved.
The superhigh tenacity concrete of the present embodiment to be directly cast on steel girder afterwards by high temperature steam curing (90 DEG C stream curing more than 48 hours) is shaping.
The STC bridge deck transverse joint 35 of superhigh tenacity concrete slab-girder steel light-duty combined bridge structure of the present embodiment is arranged on the span centre position of the less gooseneck of internal force 2 steel longerons 1, and set up partial lateral enhancing steel plate 27 herein, transverse joint 35 is positioned at the center position that partial lateral strengthens steel plate 27, and spacing of joints is 30m.
Superhigh tenacity concrete slab-girder steel light-duty combined bridge structure of the present embodiment adopts segmented prefabricated, the site assembly of factory normalization and the construction technology of cast-in-place seam section STC bridge deck.In factory, first steel longeron top flange plate 11, steel longitudinal-beam web plate 12, steel longeron bottom wing listrium 13 and steel stringer sides are formed the steel longeron 1 of standard knot segment length by welding to stiffener 15.Gooseneck top flange plate 21, gooseneck web 22, gooseneck bottom wing listrium 23 and gooseneck stiffener 24 is passed through gooseneck 2 in welding formation standard sections simultaneously, then by welding, gooseneck 2 in steel longeron 1 and standard sections is connected into standard sections steel girder, and above standard sections steel end of main beam, be welded with partial lateral enhancing steel plate 27 and fix by temporary support.Strengthen on steel plate 27 in steel longeron top flange plate 11, gooseneck top flange plate 21 and partial lateral and weld shear connector 4, afterwards in the intersegmental shuttering colligation of standard knot in length and breadth to steel mesh reinforcement 6, and reserved STC prefabricated section of longitudinal reinforcement 33 certain length enters in Cast-in-Situ Segment, so that longitudinal connecting reinforcement 34 connects into entirety with STC Cast-in-Situ Segment at the scene.Then prefabricated section 31 also high temperature steam curing is after three days to pour into a mould STC bridge deck, and stripping and partial lateral strengthen the temporary support of steel plate 27, form the light-duty combined bridge structure of STC plate-girder steel of standard sections.The STC of standard sections plate-girder steel light-duty combined bridge structure is transported to on-site hoisting in place after, be connected by the light-duty combined bridge structure of STC plate-girder steel of steel longeron butt weld 18 between sections by adjacent two standard sections, lay in length and breadth to steel mesh reinforcement at STC bridge deck Cast-in-Situ Segment 32 place, and longitudinal for STC Cast-in-Situ Segment connecting reinforcement 34 is weldingly connected with STC prefabricated section of longitudinal reinforcement 33 reserved part, high-temperature steam health after cast STC bridge deck Cast-in-Situ Segment 32 inner concrete, after forming intensity, namely the demoulding completes construction.
Embodiment 4:
As shown in figure 12, the light-duty combined bridge structure of a kind of superhigh tenacity concrete slab-girder steel of the present invention, its primary structure, connected mode, construction material and construction technology are substantially identical with 3 with embodiment 1,2, its difference is only: the steel longeron in above-described embodiment adopts i shaped steel plate-girder, and the steel longeron 1 in the present embodiment adopts steel box-girder structure, adapt therewith, include steel box-girder base plate 14 in the steel longeron 1 of the present embodiment, and on steel box-girder base plate 14, be provided with base plate longitudinally T-shaped stiffening rib 17; The steel stringer sides of above-described embodiment is not set in the steel longeron 1 of the present embodiment to stiffener 15, and replaces with web longitudinal I type stiffening rib 16.
In addition, in the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present invention, steel longeron also can adopt the form of structure of Steel Truss Beam as shown in figure 13.In the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel of the present invention, gooseneck can also adopt truss-like or steel flanged beam sway bracing; Truss-like sway bracing comprises K type truss-like sway bracing as shown in figure 14, X-type truss-like sway bracing etc. as shown in figure 15, steel flanged beam sway bracing comprises the steel flanged beam crossbeams such as I type, I shape, and its top flange plate both can contour with steel longeron top flange plate (see Figure 16), also can lower than the top flange plate of steel longeron (see Figure 17).
The foregoing is only several preferred embodiment of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All do under the technology of the present invention framework any amendment, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel, is characterized in that: described combined bridge structure forms primarily of steel longeron, gooseneck and superhigh tenacity concrete slab; Described steel longeron and gooseneck are interconnected to constitute the girder of combined bridge structure, and described superhigh tenacity concrete slab forms primarily of superhigh tenacity concreting, and described superhigh tenacity concrete is the RPC of modification; The RPC of this modification mainly refers in RPC the copper facing high-strength steel fiber being mixed with different size and/or profile; Asbestos tailings acidity leaching slag superfine powder is also mixed with in described superhigh tenacity concrete; Be furnished with in described superhigh tenacity concrete slab in length and breadth to steel mesh reinforcement; The bonding surface of the top flange plate of the bonding surface of the top flange plate of described superhigh tenacity concrete slab and steel longeron, superhigh tenacity concrete slab and gooseneck is provided with shear connector; It is shaping that described superhigh tenacity concrete have passed through high temperature steam curing, and described superhigh tenacity concrete slab does not arrange seam or only arrange transverse joint between the prefabricated subsection of superhigh tenacity concrete slab.
2. the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel according to claim 1, is characterized in that: the described length of copper facing high-strength steel fiber and the proportional control of diameter are 70 ~ 100; The profile of described copper facing high-strength steel fiber comprise in straight shape, band end hook, twisted shape two or more.
3. the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel according to claim 2, it is characterized in that: copper facing high-strength steel fiber A and copper facing high-strength steel fiber B selected by described copper facing high-strength steel fiber, described copper facing high-strength steel fiber A and described copper facing high-strength steel fiber B is any one group in following three kinds of combinations:
Combination one: described copper facing high-strength steel fiber A refers to the band end hook copper facing high-strength steel fiber of length 14mm, diameter 0.2mm, and described copper facing high-strength steel fiber B refers to the straight shape copper facing high-strength steel fiber of length 30mm, diameter 0.3mm;
The band end hook copper facing high-strength steel fiber that combination two: described copper facing high-strength steel fiber A refers to length 14mm, diameter 0.2mm, described copper facing high-strength steel fiber B refer to length 30mm, diameter 0.3mm through the cold rolling twisted shape copper facing high-strength steel fiber turning round processing;
Combination three: described copper facing high-strength steel fiber A refers to the straight shape copper facing high-strength steel fiber of length 14mm, diameter 0.2mm, and described copper facing high-strength steel fiber B refers to the band end hook copper facing high-strength steel fiber of length 30mm, diameter 0.3mm;
The volume ratio of mixing of described copper facing high-strength steel fiber A and copper facing high-strength steel fiber B controls 0.5: 1 ~ 1: 0.5, and the cumulative volume volume of described copper facing high-strength steel fiber is 2% ~ 4%.
4. the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel according to any one of claims 1 to 3, it is characterized in that: the average grain diameter of described asbestos tailings acidity leaching slag superfine powder is 2 μm ~ 5 μm, and the incorporation of asbestos tailings acidity leaching slag superfine powder is 10% ~ 25% of cementitious material in superhigh tenacity concrete component.
5. the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel according to claim 4, is characterized in that: described gooseneck is the contour I shape steel flanged beam sway bracing of the top flange plate of its top flange plate and steel longeron; Described gooseneck is along bridge longitudinally intensive layout, and intensive layout refers to that gooseneck spacing is 1/3 ~ 1/2 or 3m ~ 6m of steel girder space.
6. the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel according to claim 4, is characterized in that: the thickness of described superhigh tenacity concrete slab is 8cm ~ 16cm; In described superhigh tenacity concrete slab in length and breadth to the one-way reinforcement rate of steel mesh reinforcement be 3% ~ 6%.
7. the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel according to claim 4, is characterized in that: the transverse joint spacing of described superhigh tenacity concrete slab is 8m ~ 30m.
8. the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel according to claim 7, it is characterized in that: the transverse joint of described superhigh tenacity concrete slab is arranged on the web top of span centre position between gooseneck or gooseneck, and sets up local enhancement steel plate below transverse joint place.
9. the light-duty combined bridge structure of superhigh tenacity concrete slab-girder steel according to claim 8, it is characterized in that: when described transverse joint is arranged on the web tip position of gooseneck, described transverse joint place adopts widens top board and the longitudinal stiffener process of welding; When transverse joint is arranged on the span centre position between gooseneck, this transverse joint place sets up and laterally strengthens steel plate.
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