CN213114305U - Orthotropic steel bridge deck plate tough concrete composite structure - Google Patents
Orthotropic steel bridge deck plate tough concrete composite structure Download PDFInfo
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- CN213114305U CN213114305U CN202020712271.0U CN202020712271U CN213114305U CN 213114305 U CN213114305 U CN 213114305U CN 202020712271 U CN202020712271 U CN 202020712271U CN 213114305 U CN213114305 U CN 213114305U
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Abstract
The utility model discloses an orthotropic steel bridge deck plate toughness concrete integrated configuration relates to bridge engineering technical field, and its technical scheme main points are: the steel bridge comprises orthotropic steel bridge deck boards, a grid net and a tough concrete layer; a plurality of transverse and spaced longitudinal ribs are arranged on the bottom surface of the steel bridge deck; the top surface of the steel bridge deck plate is provided with shear nails; a plurality of criss-cross erection rib perforated plates are arranged on the top surface of the steel bridge deck at equal intervals; the top surface of the tough concrete layer is paved with an SBS modified asphalt SMA paving layer. The combined structure can improve the integral rigidity of the steel bridge deck, improve the fatigue problem of a steel bridge deck system, has the advantages of light dead weight, high bearing capacity and simple structure, and can ensure that the steel bridge deck has wide application range and good stress performance under various conditions; the construction cost of the bridge is saved, and the benefit is remarkable. The utility model discloses having obtained the subsidy of national key research and development plan, the subject name is: the key technical research of the high-efficiency construction of urban bridges with combined structures has the following topic numbers: 2017YFC 070348.
Description
Technical Field
The utility model relates to a bridge engineering technical field, more specifically say, it relates to an orthotropic steel bridge deck plate toughness concrete integrated configuration for steel box girder.
Background
The bridge deck pavement structure is an important structure for bearing the load of a bridge automobile, directly bears the repeated action of the load of wheels, and is one of vulnerable parts of the bridge structure. At present, bridge decks commonly used in engineering are divided into a concrete bridge deck, a steel bridge deck and a steel-concrete combined bridge deck.
The concrete bridge deck has the advantages of high rigidity and low manufacturing cost, but because of the advantages of heavy self weight, low construction efficiency and easy cracking, the concrete bridge deck has poor economy when being applied to a large-span bridge and is mainly applied to small and medium-span bridges or projects with loose construction period requirements. Due to the advantages of light dead weight, high strength and industrial production, the steel bridge deck is gradually used in engineering in recent years, and is particularly widely used in large-span bridges. However, the steel bridge deck is complex and expensive to pave, and in recent years, the problems of fatigue cracks of the steel bridge deck and cracking and damage of a pavement layer appear in large quantity, which are not well solved all the time, and the structure and the driving safety are influenced.
The steel-concrete combined bridge deck combines steel and a concrete structure into a whole through a shear connector, can give full play to the characteristics of high tensile strength of a steel plate and good compression resistance of concrete, and can simultaneously avoid the problems of heavy weight, easy cracking under tension, easy fatigue cracking of the steel bridge deck, easy breakage of a pavement layer and the like of the concrete bridge deck, and the application of the steel-concrete combined bridge deck in bridge engineering is gradually wide in recent years. The steel-concrete composite bridge deck which is most widely applied at present is formed by combining an orthotropic steel bridge deck with stiffening ribs arranged below steel plates and a concrete structure layer, and is mainly applied to a steel box girder bridge. However, the combined bridge deck concrete and orthotropic steel bridge deck slab have poor coordinated deformation capability and cannot be stressed cooperatively.
Therefore, it is necessary to design a novel steel-concrete composite bridge deck slab which has light dead weight, high bearing capacity, simple structure, good coordinated deformation performance of concrete and orthotropic steel bridge deck slab, and capability of cooperating with stress, so as to ensure that the steel-concrete composite bridge deck slab has wide application range and good stress performance under various conditions.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an orthotropic steel bridge deck slab toughness concrete composite structure for steel box girder bridge deck pavement, which can improve the overall rigidity of a steel bridge deck and improve the fatigue problem of a steel bridge deck system, has the advantages of light dead weight, high bearing capacity and simple structure, and can ensure that the steel bridge deck has wide application range and good stress performance under various conditions; meanwhile, the composite structure can reduce the fatigue cracking of the welding seam of the orthotropic steel bridge deck slab and save the construction cost of the whole life cycle of the bridge.
The above technical purpose of the present invention can be achieved by the following technical solutions: the orthotropic steel bridge deck tough concrete combined structure comprises orthotropic steel bridge decks, grid nets and a tough concrete layer, wherein the grid nets are laid at the top ends of the orthotropic steel bridge decks; the orthotropic steel bridge deck is composed of a steel bridge deck, longitudinal rib members and transverse rib members, a plurality of transverse spaced longitudinal ribs are arranged on the bottom surface of the steel bridge deck, the longitudinal ribs and the bottom surface of the steel bridge deck are integrally formed and rolled, and two sides of each longitudinal rib member are fixedly welded with the cross sections of the bottom ends of the longitudinal ribs; the top surface of the steel bridge deck plate is provided with a plurality of shear nails; a plurality of criss-cross upright rib perforated plates are distributed on the top surface of the steel bridge deck at equal intervals, and a plurality of boot-shaped slotted holes are formed in the upright rib perforated plates at equal intervals; the grid net is formed by interweaving transverse ribs and longitudinal ribs, and the transverse ribs and the longitudinal ribs are positioned in boot-shaped slots; the grid net, the vertical rib perforated plate and the shear nails are positioned inside the tough concrete layer; and the top surface of the tough concrete layer is paved with an SBS modified asphalt SMA paving layer.
By adopting the technical scheme, in the construction process of the orthotropic steel bridge deck plate tough concrete combined structure, the rigidity of the steel bridge deck structure is different in two mutually perpendicular directions through the orthotropic steel bridge deck plate, so that the steel bridge deck structure has anisotropy in structure, and the stress performance of the structure can be improved; meanwhile, the structure formed by combining the orthotropic steel bridge deck and the tough concrete layer can improve the integral rigidity of the steel bridge deck and the fatigue problem of a steel bridge deck system, and has the advantages of light weight, high strength, corrosion resistance and the like; the orthotropic steel bridge deck is composed of the steel bridge deck, the longitudinal rib members and the transverse rib members, so that the fatigue strength of the orthotropic steel bridge deck can be ensured, meanwhile, the fatigue cracking of welding seams of the orthotropic steel bridge deck is greatly reduced, and the whole life cycle construction cost of the bridge is saved; the grid net is used for enhancing the shearing resistance of the interface after the tough concrete is poured and reducing the risk of fatigue cracking of the orthotropic steel bridge deck; meanwhile, tough concrete is poured on the grid mesh, so that the grid mesh is positioned in the tough concrete layer, the tough concrete layer has the advantages of high rigidity, high strength, good toughness and the like, the cracking of a steel bridge deck pavement layer can be effectively prevented, and the steel bridge deck pavement structure has the advantages of high interlayer shearing resistance, peeling resistance, water resistance, high rigidity, high strength, good toughness and the like; the steel bridge deck pavement structure is conveniently formed by combining the tough concrete layer with the orthotropic steel bridge deck, so that the steel bridge deck has the advantages of light dead weight, high bearing capacity and simple structure under the condition of ensuring the stress performance; the connection among the top surface of the orthotropic steel bridge deck, the grid net and the tough concrete layer is facilitated through the shear nails; the grid net is convenient to fix and accurately control the position of the grid net in the tough concrete layer through the vertical bar perforated plate; the transverse ribs and the longitudinal ribs are conveniently placed in the boot-shaped slotted holes through the boot-shaped slotted holes, so that the transverse ribs and the longitudinal ribs are conveniently fixed in position, and the arrangement process of the grid net is simplified; the orthotropic steel bridge deck plate tough concrete combined structure can improve the overall rigidity of a steel bridge deck plate pavement layer and the fatigue problem of a steel bridge deck system, has the advantages of light dead weight, high bearing capacity and simple structure, and can ensure that the steel bridge deck has wide application range and good stress performance under various conditions; meanwhile, the orthotropic steel bridge deck plate tough concrete combined structure can reduce the fatigue cracking of welding seams of orthotropic steel bridge deck plates and save the construction cost of the whole life cycle of the bridge.
The utility model discloses further set up to: the transverse ribs and the longitudinal ribs are one of HRB400 steel bars, galvanized steel bars, epoxy resin coating steel bars or basalt fiber steel bars.
By adopting the technical scheme, one of HRB400 steel bars, galvanized steel bars, epoxy resin coating steel bars or basalt fiber steel bars is adopted as the transverse ribs and the longitudinal ribs, so that the durability of the grid meshes in the tough concrete layer is ensured conveniently.
The utility model discloses further set up to: the diameters of the transverse ribs and the longitudinal ribs are both 10 mm.
By adopting the technical scheme, the diameters of the transverse ribs and the longitudinal ribs are both 10mm, so that the integral rigidity and the bending resistance of the tough concrete layer are ensured conveniently.
The utility model discloses further set up to: the shear nails are distributed in a plum blossom shape and are positioned in the centers of the pores of the grid net.
By adopting the technical scheme, the shear nails are distributed in a plum blossom shape and are positioned in the centers of the holes of the grid net, so that the grid net is convenient to fix.
The utility model discloses further set up to: the longitudinal section of the longitudinal rib is in an inverted trapezoid shape.
By adopting the technical scheme, the longitudinal section of the longitudinal rib is inverted trapezoid, so that the welding deformation stability of the orthotropic steel bridge deck is ensured conveniently.
The utility model discloses further set up to: the transverse rib members are welded with the longitudinal ribs and the steel bridge deck.
By adopting the technical scheme, the transverse rib members are welded with the longitudinal ribs and the steel bridge deck plate, so that the transverse rib members, the longitudinal ribs and the steel bridge deck plate are connected into a whole, and the integral stress performance of the orthotropic steel bridge deck plate is convenient to ensure.
The utility model discloses further set up to: the thickness of the tough concrete layer is 100 mm.
Through adopting above-mentioned technical scheme, the thickness on toughness concrete layer is 100mm, is convenient for satisfy toughness concrete layer's low shrinkage performance and high tensile strength.
The utility model discloses further set up to: the pouring mixture for the tough concrete layer adopts the following formula: 430-450 parts of cement, 184-192 parts of fine ground fly ash, 1.7-1.9 parts of micro silicon powder, 570-596 parts of crushed stone, 850-890 parts of river sand, 233-243 parts of water, 16-18 parts of high-performance admixture and 114-120 parts of steel fiber; the strength of the cement is not lower than 42.5 MPa; the specific surface area of the finely ground fly ash is not less than 600m 2/kg; the specific surface area of the micro silicon powder is not less than 15000m 2/kg; the maximum particle size of the crushed stone is less than 20mm and the grading is good; the fineness modulus of the river sand is 3.1-3.7; the length of the steel fiber is not more than 30mm, and the length-diameter ratio of the steel fiber is not more than 60.
By adopting the technical scheme, 430-450 parts of cement with the strength not lower than 42.5MPa and the specific surface area not less than 600m are adopted2184-192 parts of/kg fine ground fly ash, and the specific surface area of the fine ground fly ash is not less than 15000m21.7-1.9 parts of silicon micropowder/kg, 570-596 parts of crushed stone with the maximum particle size of less than 20mm and good gradation, 850-890 parts of river sand with the fineness modulus of 3.1-3.7, 233-243 parts of water and 114-120 parts of steel fiber with the length of not more than 30mm and the length-diameter ratio of not more than 60, wherein the tough concrete layer is formed by pouring a tough concrete mixture formula, so that the fluidity of the poured tough concrete mixture is good, and the construction difficulty of steel bridge deck tough concrete pavement is reduced; meanwhile, the early cracking risk of the steel bridge deck toughness concrete pavement can be reduced; in addition, the tough concrete layer formed by pouring the tough concrete by adopting the formula can be conveniently maintained at normal temperature in the later period, and the tough concrete of the steel bridge deck can be reducedMaintenance cost of the paving material.
The construction method of the orthotropic steel bridge deck plate tough concrete composite structure comprises the following steps:
s1, prefabricating orthotropic steel bridge decks in sections in a factory, welding shear nails in the factory, spraying antirust paint, transporting the orthotropic steel bridge decks to a bridge site in sections, hoisting the orthotropic steel bridge decks to erected steel longitudinal beams through a crane for assembly, performing accurate positioning, then assembling and seam welding the orthotropic steel bridge deck sections, then performing site welding on the shear nails which are not welded to the surfaces of the orthotropic steel bridge decks in the factory at the assembly welding seams, and performing site rust removal and antirust paint spraying for antirust treatment, wherein the rust removal cleanliness reaches Sa2.5 level, and the roughness reaches 80-120 mu m.
S2, arranging a plurality of vertical rib perforated plates and a grid mesh, wherein the vertical rib perforated plates are arranged on the top surface of the steel bridge panel of the orthotropic steel bridge panel at equal intervals along the transverse direction and the longitudinal direction, the vertical rib perforated plates are provided with a plurality of boot-shaped slotted holes, the spacing between the vertical rib perforated plates arranged in the same direction is 100mm, and the vertical rib perforated plates are fixedly welded with the top surface of the steel bridge panel; then, respectively arranging the transverse ribs and the longitudinal ribs in boot-shaped slotted holes of the erection rib perforated plate transversely arranged along the steel bridge deck and boot-shaped slotted holes of the erection rib perforated plate longitudinally arranged along the steel bridge deck, so that the transverse ribs and the longitudinal ribs form a grid net;
s3, cleaning the top surface of the orthotropic steel bridge deck plate, and blowing the top surface of the orthotropic steel bridge deck plate clean by using an air compressor rubber hose tuyere;
s4, pouring a tough concrete layer, intensively mixing the tough concrete grout on the top surface of the orthotropic steel bridge deck at a mixing station to form the tough concrete layer on the top surface of the orthotropic steel bridge deck, wherein the grid net, the upright rib perforated plate and the shear nails are positioned inside the tough concrete layer;
and S5, constructing an SBS modified asphalt SMA pavement layer, after the tough concrete layer poured in the step S4 is initially set and the health preserving period is over, roughly treating the top surface of the tough concrete layer, and paving the SBS modified asphalt SMA pavement layer.
To sum up, the utility model discloses following beneficial effect has:
1. through the orthotropic steel bridge deck plate, the rigidity of the steel bridge deck structure is different in two mutually perpendicular directions, so that the steel bridge deck structure has anisotropy in structure, and the stress performance of the steel bridge deck structure can be improved; meanwhile, the steel bridge deck pavement structure formed by combining the orthotropic steel bridge deck slab and the tough concrete layer can improve the overall rigidity of the steel bridge deck and improve the fatigue problem of a steel bridge deck system, and the steel bridge deck pavement structure has the advantages of light weight, high strength, corrosion resistance and the like;
2. the orthotropic steel bridge deck is composed of the steel bridge deck, the longitudinal rib members and the transverse rib members, so that the fatigue strength of the orthotropic steel bridge deck can be ensured, meanwhile, the fatigue cracking of welding seams of the orthotropic steel bridge deck is greatly reduced, and the whole life cycle construction cost of the bridge is saved; the grid net is used for enhancing the shearing resistance of the interface after the tough concrete is poured and reducing the risk of fatigue cracking of the orthotropic steel bridge deck; meanwhile, tough concrete is poured on the grid mesh, so that the grid mesh is positioned in the tough concrete layer, the tough concrete layer has the advantages of high rigidity, high strength, good toughness and the like, the cracking of a steel bridge deck pavement layer can be effectively prevented, and the steel bridge deck pavement structure has the advantages of high interlayer shearing resistance, peeling resistance, water resistance, high rigidity, high strength, good toughness and the like;
3. the composite steel bridge deck is conveniently combined with the orthotropic steel bridge deck through the tough concrete layer, so that the steel bridge deck has the advantages of light dead weight, high bearing capacity and simple structure under the condition of ensuring the stress performance;
4. the connection among the top surface of the orthotropic steel bridge deck, the grid net and the tough concrete layer is facilitated through the shear nails; the grid net is convenient to fix and accurately control the position of the grid net in the tough concrete layer through the vertical bar perforated plate; the transverse ribs and the longitudinal ribs are conveniently placed in the boot-shaped slotted holes through the boot-shaped slotted holes, so that the transverse ribs and the longitudinal ribs are conveniently fixed in position, and the arrangement process of the grid net is simplified;
5. the orthotropic steel bridge deck plate tough concrete combined structure can improve the integral rigidity of a steel bridge deck and the fatigue problem of a steel bridge deck system, has the advantages of light dead weight, high bearing capacity and simple structure, and can ensure that the steel bridge deck has wide application range and good stress performance under various conditions; meanwhile, the orthotropic steel bridge deck plate tough concrete combined structure can reduce the fatigue cracking of welding seams of orthotropic steel bridge deck plates and save the construction cost of the whole life cycle of the bridge.
Drawings
Fig. 1 is a schematic perspective view of an embodiment of the present invention;
FIG. 2 is a schematic longitudinal sectional view of an orthotropic steel deck plate according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of an embodiment of the present invention;
fig. 4 is a flow chart of the construction method of the orthotropic steel bridge deck plate tough concrete composite structure in the embodiment of the utility model.
In the figure: 1. orthotropic steel decking; 2. a grid net; 3. a tough concrete layer; 4. a steel deck plate; 5. a longitudinal rib member; 6. a cross rib member; 7. longitudinal ribs; 8. shear nails; 9. erecting a rib perforated plate; 10. a boot-shaped slot; 11. a transverse rib; 12. longitudinal ribs; 13. and the SBS modified asphalt SMA paving layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying fig. 1-4.
Example (b): a combined structure of orthotropic steel bridge deck plate and tough concrete is shown in figures 1, 2 and 3 and comprises an orthotropic steel bridge deck plate 1, a grid net 2 and a tough concrete layer 3, wherein the grid net 2 is laid on the top end of the orthotropic steel bridge deck plate 1. The orthotropic steel bridge deck 1 is composed of a steel bridge deck 4, longitudinal rib members 5 and transverse rib members 6, a plurality of transverse spaced longitudinal ribs 7 are welded on the bottom surface of the steel bridge deck 4, the longitudinal ribs 7 and the bottom surface of the steel bridge deck 4 are integrally formed and rolled, and the two sides of the longitudinal rib members 5 are fixedly welded with the bottom end sections of the longitudinal ribs 7. A plurality of shear nails 8 are fixedly welded on the top surface of the steel bridge deck 4. A plurality of criss-cross upright rib perforated plates 9 are welded on the top surface of the steel bridge deck 4 at equal intervals, and a plurality of boot-shaped slotted holes 10 are machined on the upright rib perforated plates 9 at equal intervals. The grid net 2 is formed by interweaving transverse ribs 11 and longitudinal ribs 12, and the transverse ribs 11 and the longitudinal ribs 12 are positioned in the boot-shaped slotted holes 10. The grid net 2, the vertical bar perforated plate 9 and the shear nails 8 are positioned inside the tough concrete layer 3. The top surface of the tough concrete layer 3 is paved with an SBS modified asphalt SMA paving layer 13.
In this embodiment, the orthotropic steel bridge deck plate and tough concrete composite structure is only used for paving the top surface of the steel box girder. The orthotropic steel bridge deck slab 1 is processed and prefabricated in a factory. The shear nails 8 are welded on the top surface of the orthotropic steel bridge deck slab 1 in a factory, and the shear nails 8 and the orthotropic steel bridge deck slab 1 are sprayed with antirust paint in the factory for antirust treatment. The shear nail 8 is an industrial product, and the technical standard thereof is carried out according to the column head welding nail for arc stud welding (GB/T10433-2002). The transverse ribs 11 and the longitudinal ribs 12 are HRB400 steel bars. In the construction process of the orthotropic steel bridge deck plate tough concrete combined structure, the rigidity of the steel bridge deck plate structure is different in two mutually perpendicular directions through the orthotropic steel bridge deck plate 1, the steel bridge deck plate structure can have anisotropy in structure, and the stress performance of the steel bridge deck plate structure can be improved. Meanwhile, the steel bridge deck pavement structure formed by combining the orthotropic steel bridge deck slab 1 and the tough concrete layer 3 can improve the overall rigidity of the steel bridge deck and the fatigue problem of a steel bridge deck system, and has the advantages of light weight, high strength, corrosion resistance and the like. The orthotropic steel bridge deck slab 1 is composed of a steel bridge deck slab 4, longitudinal rib members 5 and transverse rib members 6, the fatigue strength of the orthotropic steel bridge deck slab 1 can be guaranteed, meanwhile, the fatigue cracking of welding seams of the orthotropic steel bridge deck slab 1 is greatly reduced, and the whole life cycle construction cost of a bridge is saved. Through grid net 2, be convenient for strengthen the shear capacity at interface after pouring toughness concrete, can also reduce the risk of orthotropic steel bridge deck slab 1 fatigue fracture. Simultaneously, the tough concrete is poured on the grid net 2, so that the grid net 2 is positioned inside the tough concrete layer 3, the tough concrete layer 3 has the advantages of high rigidity, high strength, good toughness and the like, the cracking of the steel bridge deck pavement layer can be effectively prevented, and the steel bridge deck pavement structure layer has the advantages of high shearing resistance, stripping resistance, water resistance, high rigidity, high strength, good toughness and the like. Through the tough concrete layer 3, be convenient for combine with orthotropic steel decking 1 to constitute combination steel deck for steel decking possesses the advantage that dead weight is light, bearing capacity is high, simple structure under the bar that guarantees the atress performance. Through the shear nails 8, the connection among the top surface of the orthotropic steel bridge deck 1, the grid net 2 and the tough concrete layer 3 is facilitated. Through the vertical bar perforated plate 9, the grid net 2 is convenient to fix, and the position of the grid net 2 in the tough concrete layer 3 is convenient to accurately control. Through the shoe-shaped slotted hole 10, the transverse ribs 11 and the longitudinal ribs 12 are conveniently placed in the shoe-shaped slotted hole 10, so that the transverse ribs 11 and the longitudinal ribs 12 are conveniently fixed in position, and the arrangement process of the grid net 2 is simplified. The orthotropic steel bridge deck plate tough concrete combined structure can improve the overall rigidity of a steel bridge deck and the fatigue problem of a steel bridge deck system, has the advantages of light dead weight, high bearing capacity and simple structure, and can ensure that the steel bridge deck has wide application range and good stress performance under various conditions. Meanwhile, the orthotropic steel bridge deck plate tough concrete combined structure can reduce the fatigue cracking of the welding line of the orthotropic steel bridge deck plate 1 and save the construction cost of the whole life cycle of the bridge.
The transverse ribs 11 and the longitudinal ribs 12 are one of HRB400 steel bars, galvanized steel bars, epoxy resin coating steel bars or basalt fiber steel bars.
In this embodiment, one of the HRB400 steel bars, the galvanized steel bars, the epoxy resin coated steel bars, or the basalt fiber steel bars is used as the transverse bars 11 and the longitudinal bars 12, so as to ensure the durability of the grid mesh 2 in the tough concrete layer 3.
The transverse ribs 11 and the longitudinal ribs 12 are each 10mm in diameter.
In this embodiment, the transverse ribs 11 and the longitudinal ribs 12 are each 10mm in diameter, so as to ensure the overall rigidity and bending resistance of the tough concrete layer 3.
The shear nails 8 are distributed in a plum blossom shape, and the shear nails 8 are positioned in the centers of the pores of the grid net 2.
In this embodiment, the shear pins 8 are distributed in a plum blossom shape, and the shear pins 8 are located in the centers of the pores of the grid net 2, so as to fix the grid net 2.
The longitudinal section of the longitudinal ribs 7 is inverted trapezoidal.
In the present embodiment, the longitudinal section of the longitudinal rib 7 is an inverted trapezoid, which is convenient to ensure the welding deformation stability of the orthotropic steel deck slab 1.
The cross rib members 6 are welded to the longitudinal ribs 7 and the steel decking 4.
In this embodiment, the transverse rib member 6 is welded to the longitudinal ribs 7 and the steel bridge deck 4, so that the transverse rib member 6, the longitudinal ribs 7 and the steel bridge deck 4 are connected into a whole, thereby ensuring the overall stress performance of the orthotropic steel bridge deck 1.
The thickness of the tough concrete layer 3 is 100 mm.
In this embodiment, the thickness of the tough concrete layer 3 is 100mm, which is convenient for satisfying the low shrinkage property and the high tensile strength of the tough concrete layer 3.
The pouring mixture of the tough concrete layer 3 adopts the following formula: 430-450 parts of cement, 184-192 parts of fine ground fly ash, 1.7-1.9 parts of micro silicon powder, 570-596 parts of crushed stone, 850-890 parts of river sand, 233-243 parts of water, 16-18 parts of high-performance admixture and 114-120 parts of steel fiber. The strength of the cement is not lower than 42.5 MPa. The specific surface area of the finely ground fly ash is not less than 600m2In terms of/kg. The specific surface area of the micro silicon powder is not less than 15000m2In terms of/kg. The maximum particle size of the crushed stone is less than 20mm and the grading is good. The fineness modulus of the river sand is 3.1-3.7. The length of the steel fiber is not more than 30mm, and the length-diameter ratio of the steel fiber is not more than 60.
In the embodiment, 430-450 parts of cement with the strength not lower than 42.5MPa, 184-192 parts of fine-ground fly ash with the specific surface area not less than 600m2/kg, 1.7-1.9 parts of silica fume with the specific surface area not less than 15000m2/kg, 570-596 parts of crushed stone with the maximum particle size less than 20mm and good gradation, 850-890 parts of river sand with the fineness modulus of 3.1-3.7, 233-243 parts of water and 114-120 parts of steel fiber with the length not more than 30mm and the length-diameter ratio not more than 60 are adopted to form the tough concrete layer 3 poured according to the tough concrete mixture formula, so that the poured tough concrete mixture has good fluidity and the construction difficulty of paving the tough concrete on a steel bridge deck can be reduced. Meanwhile, the early cracking risk of the steel bridge deck toughness concrete pavement can be reduced. In addition, the tough concrete layer 3 formed by pouring the tough concrete by adopting the formula is convenient for normal-temperature curing in the later period, and can reduce the curing cost of the steel bridge deck tough concrete paving material.
As shown in fig. 4, the construction method of the orthotropic steel bridge deck plate tough concrete composite structure comprises the following steps:
s1, prefabricating the orthotropic steel bridge deck 1 in a factory in stages, welding shear nails in the factory, spraying antirust paint, transporting the orthotropic steel bridge deck 1 to a bridge site in sections, hoisting the orthotropic steel bridge deck 1 to an erected steel longitudinal beam through a crane for assembly, performing accurate positioning, then assembling and seam welding the sections of the orthotropic steel bridge deck 1, performing site welding on the shear nails, which are not welded on the surface of the orthotropic steel bridge deck 1 in the factory, of the assembly welding seams, performing site rust removal, spraying antirust paint for rust removal, wherein the rust removal cleanliness reaches Sa2.5 level, and the roughness reaches 80-120 mu m.
S2, arranging the erection rib perforated plates 9 and the grid meshes 2, arranging a plurality of vertically and horizontally staggered erection rib perforated plates 9 on the top surface of the steel bridge panel 4 of the orthotropic steel bridge panel 1 at equal intervals along the transverse direction and the longitudinal direction, arranging a plurality of boot-shaped slotted holes 10 on the erection rib perforated plates 9, arranging the erection rib perforated plates 9 in the same direction at an interval of 100mm, and fixedly welding the erection rib perforated plates 9 and the top surface of the steel bridge panel 4. Then, the transverse ribs 11 and the longitudinal ribs 12 are respectively arranged in the shoe-shaped slotted holes 10 of the vertical rib perforated plates 9 transversely arranged along the steel bridge deck 4 and the shoe-shaped slotted holes 10 of the vertical rib perforated plates 9 longitudinally arranged along the steel bridge deck 4, so that the transverse ribs 11 and the longitudinal ribs 12 form the grid net 2.
S3, cleaning the top surface of the orthotropic steel bridge deck plate 1, and blowing the top surface of the orthotropic steel bridge deck plate 1 clean by using an air compressor rubber hose tuyere.
S4, pouring a tough concrete layer 3, intensively mixing the well-mixed tough concrete grout on the top surface of the orthotropic steel bridge deck 1 at a mixing station, so that the tough concrete layer 3 is formed on the top surface of the orthotropic steel bridge deck 1, and the grid net 2, the vertical bar open pore plate 9 and the shear nails 8 are positioned inside the tough concrete layer 3.
And S5, constructing the SBS modified asphalt SMA pavement layer 13, after the tough concrete layer 3 poured in the step S4 is initially set and the health preserving period is over, roughly treating the top surface of the tough concrete layer 3, and paving the SBS modified asphalt SMA pavement layer 13.
The working principle is as follows: in the construction process of the orthotropic steel bridge deck plate tough concrete composite structure, the orthotropic steel bridge deck plate 1 is used for ensuring that the rigidity of the steel bridge deck structure is different in two mutually vertical directions, so that the steel bridge deck structure has anisotropy in structure, and the stress performance of the steel bridge deck pavement structure can be improved. Meanwhile, the steel bridge deck pavement structure formed by combining the orthotropic steel bridge deck slab 1 and the tough concrete layer 3 can improve the overall rigidity of the steel bridge deck and the fatigue problem of a steel bridge deck system, and has the advantages of light weight, high strength, corrosion resistance and the like. The orthotropic steel bridge deck slab 1 is composed of a steel bridge deck slab 4, longitudinal rib members 5 and transverse rib members 6, the fatigue strength of the orthotropic steel bridge deck slab 1 can be guaranteed, meanwhile, the fatigue cracking of welding seams of the orthotropic steel bridge deck slab 1 is greatly reduced, and the whole life cycle construction cost of a bridge is saved. Through grid net 2, be convenient for strengthen the shear capacity at interface after pouring toughness concrete, can also reduce the risk of orthotropic steel bridge deck slab 1 fatigue fracture. Simultaneously, the tough concrete is poured on the grid net 2, so that the grid net 2 is positioned inside the tough concrete layer 3, the tough concrete layer 3 has the advantages of high rigidity, high strength, good toughness and the like, the cracking of the steel bridge deck pavement layer can be effectively prevented, and the steel bridge deck pavement structure layer has the advantages of high shearing resistance, stripping resistance, water resistance, high rigidity, high strength, good toughness and the like. Through the tough concrete layer 3, be convenient for combine with orthotropic steel decking 1 to constitute combination steel deck for steel decking possesses the advantage that dead weight is light, bearing capacity is high, simple structure under the bar that guarantees the atress performance. Through the shear nails 8, the connection among the top surface of the orthotropic steel bridge deck 1, the grid net 2 and the tough concrete layer 3 is facilitated. Through the vertical bar perforated plate 9, the grid net 2 is convenient to fix, and the position of the grid net 2 in the tough concrete layer 3 is convenient to accurately control. Through the shoe-shaped slotted hole 10, the transverse ribs 11 and the longitudinal ribs 12 are conveniently placed in the shoe-shaped slotted hole 10, so that the transverse ribs 11 and the longitudinal ribs 12 are conveniently fixed in position, and the arrangement process of the grid net 2 is simplified. The orthotropic steel bridge deck plate tough concrete combined structure can improve the overall rigidity of a steel bridge deck and the fatigue problem of a steel bridge deck system, has the advantages of light dead weight, high bearing capacity and simple structure, and can ensure that the steel bridge deck has wide application range and good stress performance under various conditions. Meanwhile, the orthotropic steel bridge deck plate tough concrete combined structure can reduce the fatigue cracking of the welding line of the orthotropic steel bridge deck plate 1 and save the construction cost of the whole life cycle of the bridge.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.
Claims (7)
1. The utility model provides an orthotropic steel decking toughness concrete integrated configuration which characterized by: the steel bridge floor comprises orthotropic steel bridge deck plates (1), a grid net (2) and a tough concrete layer (3), wherein the grid net (2) is laid on the top ends of the orthotropic steel bridge deck plates (1); the orthotropic steel bridge deck (1) is composed of a steel bridge deck (4), longitudinal rib members (5) and transverse rib members (6), a plurality of transverse spaced longitudinal ribs (7) are arranged on the bottom surface of the steel bridge deck (4), the longitudinal ribs (7) and the bottom surface of the steel bridge deck (4) are integrally formed and rolled, and two sides of each longitudinal rib member (5) are fixedly welded with the cross section of the bottom end of each longitudinal rib (7); the top surface of the steel bridge deck (4) is provided with a plurality of shear nails (8); a plurality of criss-cross upright rib perforated plates (9) are distributed on the top surface of the steel bridge deck (4) at equal intervals, and a plurality of boot-shaped slotted holes (10) are formed in the upright rib perforated plates (9) at equal intervals; the grid net (2) is formed by interweaving transverse ribs (11) and longitudinal ribs (12), and the transverse ribs (11) and the longitudinal ribs (12) are positioned in the boot-shaped slotted holes (10); the grid net (2), the vertical bar perforated plate (9) and the shear nails (8) are positioned inside the tough concrete layer (3); and an SBS modified asphalt SMA paving layer (13) is paved on the top surface of the tough concrete layer (3).
2. The flexible concrete composite structure of orthotropic steel bridge deck slab as claimed in claim 1, wherein: the transverse ribs (11) and the longitudinal ribs (12) are one of HRB400 steel bars, galvanized steel bars, epoxy resin coating steel bars or basalt fiber steel bars.
3. The flexible concrete composite structure of orthotropic steel bridge deck slab as claimed in claim 1, wherein: the diameters of the transverse ribs (11) and the longitudinal ribs (12) are both 10 mm.
4. The flexible concrete composite structure of orthotropic steel bridge deck slab as claimed in claim 1, wherein: the shear nails (8) are distributed in a plum blossom shape, and the shear nails (8) are positioned in the centers of the holes of the grid net (2).
5. The flexible concrete composite structure of orthotropic steel bridge deck slab as claimed in claim 1, wherein: the longitudinal section of the longitudinal ribs (7) is inverted trapezoid.
6. The flexible concrete composite structure of orthotropic steel bridge deck slab as claimed in claim 1, wherein: the transverse rib members (6) are welded with the longitudinal ribs (7) and the steel bridge deck (4).
7. The flexible concrete composite structure of orthotropic steel bridge deck slab as claimed in claim 1, wherein: the thickness of the tough concrete layer (3) is 100 mm.
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