CN110552289A - Ultra-high performance concrete combined bridge deck pavement layer structure and construction method thereof - Google Patents
Ultra-high performance concrete combined bridge deck pavement layer structure and construction method thereof Download PDFInfo
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- CN110552289A CN110552289A CN201910937720.3A CN201910937720A CN110552289A CN 110552289 A CN110552289 A CN 110552289A CN 201910937720 A CN201910937720 A CN 201910937720A CN 110552289 A CN110552289 A CN 110552289A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 104
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- 229910000831 Steel Inorganic materials 0.000 claims description 28
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- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 24
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- 238000004140 cleaning Methods 0.000 claims description 2
- 230000036541 health Effects 0.000 claims description 2
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention discloses an ultra-high performance concrete combined bridge deck pavement layer structure and a construction method thereof, relating to the technical field of highway bridge engineering, and the key points of the technical scheme are as follows: the concrete box girder comprises a concrete box girder top plate, wherein an ultrahigh-performance concrete layer is arranged on the top surface of the concrete box girder top plate, and the thickness of the ultrahigh-performance concrete layer is 100 mm; the top surface of the ultra-high performance concrete layer is paved with an asphalt concrete pavement; and the top surface of the concrete box girder top plate is provided with a reinforcing mesh positioned in the ultra-high performance concrete layer. Can effectively prevent that harmful salt ion lasts to permeate to the concrete of concrete box girder roof top surface to can prolong the life-span of structure of mating formation, and when changing road surface pavement bituminous concrete pavement layer, can effectively protect concrete box girder roof top surface concrete not receive the damage. The invention has been subsidized by national key research and development plans, and the title of the subject is as follows: the key technical research of the high-efficiency construction of urban bridges with combined structures has the following topic numbers: 2017YFC 0703408.
Description
Technical Field
The invention relates to the technical field of highway bridge engineering, in particular to an ultrahigh-performance concrete combined bridge deck pavement layer structure.
Background
With the rapid development of modern transportation industry, the number of large-span bridges is increasing, the bridge deck pavement technology is increasingly regarded as one of key technologies for building the large-span bridges, the application and research on pavement structure combination are deepened continuously, and a combined bridge deck pavement system mainly comprising 3 pavement materials of cast asphalt concrete, epoxy asphalt concrete and asphalt mastic gravel mixture is gradually formed. The cast asphalt concrete is widely applied abroad, and representative projects of the cast asphalt concrete are such as Germany European Burcasier bridge, English Henber bridge, Japan Ming Shi strait bridge and the like, China carries out a series of active exploration after the cast asphalt concrete is introduced into the Yangtze river bridge in the Yangtze river, such as Qingdao Bay bridge, Gangzhu Australian bridge and the like, and a cast asphalt concrete paving system suitable for the use environment of Chinese bridges is gradually formed. Compared with the foreign countries, the research of China on bridge deck pavement technology starts late, the design of bridge deck pavement structure is generally determined according to experience, the attention degree of the bridge deck pavement structure to the waterproof adhesive layer is not enough in design, and the bridge deck pavement structure has serious early diseases when the service life is not reached, even has repeated repair and reconstruction, and seriously affects the service performance of the bridge.
At present, in the prior art, asphalt concrete pavements are directly paved on the top surface of a concrete box girder top plate of a concrete bridge, harmful salt ions in snow melting agent snow melting sprinkled in a monsoon freezing area are prevented from corroding concrete on the top surface of the box girder, so that the asphalt concrete pavements are damaged in early stage, the concrete performance is deteriorated, the surface is degraded, diseases occur, the durability is reduced, the structural function is lost, and huge fund waste is caused.
In the prior art, the asphalt mixed pavement is directly paved on the top surface of the concrete box girder top plate of the highway mixed concrete box girder bridge. In northern freezing areas, snow is melted by spreading a snow-melting agent in order to ensure that the highway can be unobstructed in a snowy day. Harmful salt ions contained in the snow-melting agent corrode concrete on the top surface of the concrete box girder by permeating into the top surface of the concrete box girder. The asphalt concrete is chemically reacted with the concrete composition material to generate a substance without gel effect or expansibility, and the structural components of the mixed concrete are changed, so that the asphalt concrete pavement paved on the top surface of the concrete box girder can be damaged in an early stage. Along with the continuous spreading of the snow melting agent for melting snow, harmful salt ions of the snow melting agent continuously permeate into concrete on the top surface of the concrete box girder, continuously corrode the concrete on the top surface of the concrete box girder, so that the concrete is degraded in performance, degraded in surface, damaged, reduced in durability, lost in structural function and huge in capital waste.
Disclosure of Invention
the invention aims to provide an ultra-high performance concrete combined bridge deck pavement layer structure and a construction method thereof, which can effectively prevent harmful salt ions from continuously permeating into concrete on the top surface of a concrete box girder top plate, prolong the service life of a pavement structure, and effectively protect the concrete on the top surface of the concrete box girder top plate from being damaged when a pavement asphalt concrete pavement layer is replaced; in addition, the construction method of the ultra-high performance concrete combined bridge deck pavement layer structure is easy to realize, has low cost and can be widely applied to construction control operation similar to concrete bridge deck pavement.
The technical purpose of the invention is realized by the following technical scheme: an ultrahigh-performance concrete combined bridge deck pavement layer structure comprises a concrete box girder top plate, wherein an ultrahigh-performance concrete layer is arranged on the top surface of the concrete box girder top plate, and the thickness of the ultrahigh-performance concrete layer is 100 mm; the top surface of the ultra-high performance concrete layer is paved with an asphalt concrete pavement; the ultra-high performance concrete layer comprises a reinforcing mesh arranged on the top surface of the top plate of the concrete box girder.
by adopting the technical scheme, the anti-permeability performance of the concrete combined bridge deck pavement structure is excellent through the ultra-high performance concrete layer, and the concrete combined bridge deck pavement structure is suitable for a high-corrosion environment and a circulating freeze-thaw environment; the concrete composite bridge deck pavement layer structure formed by the concrete box girder top plate, the ultrahigh-performance concrete layer on the top surface of the concrete box girder top plate and the asphalt concrete pavement paved on the top surface of the ultrahigh-performance concrete layer can effectively prevent harmful salt ions from continuously permeating into the concrete on the top surface of the concrete box girder top plate, prolong the service life of the pavement structure, and effectively protect the concrete on the top surface of the concrete box girder top plate from being damaged when the pavement asphalt concrete pavement layer is replaced.
The invention is further configured to: the reinforcing mesh comprises a plurality of longitudinal reinforcing steel bars along the bridge and a plurality of transverse reinforcing steel bars along the bridge; and lead wires are bound at the joints of the longitudinal steel bars of the bridge and the transverse steel bars of the bridge.
By adopting the technical scheme, the reinforcing mesh is convenient to form through the longitudinal reinforcing steel bars along the bridge and the transverse reinforcing steel bars along the bridge, so that the operation of pouring the ultra-high performance concrete layer is convenient; through the lead wire, be convenient for with in the same direction as the node of bridge longitudinal reinforcement and in the same direction as bridge horizontal reinforcement ligature fixed.
The invention is further configured to: the space between the longitudinal steel bars along the bridge is 100mm, and the diameter of the longitudinal steel bars along the bridge is 10 mm; be 100mm in the same direction as the interval between the horizontal reinforcing bar of bridge, just in the same direction as the diameter of the horizontal reinforcing bar of bridge is 10 mm.
By adopting the technical scheme, the longitudinal steel bars with the spacing of 100mm and the diameter of 10mm along the bridge and the transverse steel bars with the spacing of 100mm and the diameter of 10mm along the bridge are utilized to enhance the integral rigidity and the bending resistance of the ultra-high performance concrete layer formed by pouring the ultra-high performance concrete, so that the pavement structure and the concrete bridge deck slab have good bonding property and stress deformation coordination capacity, and the service life of the pavement structure can be prolonged.
The invention is further configured to: the bottom surface of the reinforcing mesh is provided with a plurality of concrete cushion blocks, and the length, width and height of each concrete cushion block are all 30 mm; the concrete cushion blocks are distributed in a plum blossom shape, and the distance between the concrete cushion blocks is 600 mm.
By adopting the technical scheme, the positions of the reinforcing steel bar meshes are convenient to fix through the concrete cushion blocks distributed in the plum blossom shape; meanwhile, the concrete cushion block is convenient for preventing the reinforcing mesh from rusting, and the durability of the ultra-high performance concrete layer structure is realized.
The invention is further configured to: the longitudinal steel bars along the bridge and the transverse steel bars along the bridge are arranged in the middle of the ultra-high performance concrete layer in the height direction.
Through adopting above-mentioned technical scheme, in the middle of the vertical reinforcing bar of same direction as bridge and in the direction of height of bridge horizontal reinforcing bar at ultra high performance concrete layer, be convenient for ensure in the same direction as the vertical reinforcing bar of bridge and in the same direction as the bonding force between bridge horizontal reinforcing bar and the ultra high performance concrete layer to can make in the same direction as the vertical reinforcing bar of bridge, in the same direction as the horizontal reinforcing bar of bridge and the structural stability of the ultra high performance concrete layer of pouring.
A construction method of an ultra-high performance concrete combined bridge deck pavement layer structure specifically comprises the following steps:
1) The top surface of the concrete box girder top plate is subjected to rough treatment by adopting the processes of roughening, milling and blasting;
2) binding and laying a reinforcing mesh, arranging longitudinal bridge-following reinforcing steel bars with the diameter of 10mm along the bridge direction at the top surface of the top plate of the concrete box girder at equal intervals of 100mm, then arranging transverse bridge-following reinforcing steel bars with the diameter of 10mm along the bridge direction at the top surface of the longitudinal bridge-following reinforcing steel bars at equal intervals of 100mm, and firmly binding the longitudinal bridge-following reinforcing steel bars and the transverse bridge-following reinforcing steel bars by adopting No. 24 lead wires with the diameter of 0.55mm at each node of the longitudinal bridge-following reinforcing steel bars and the transverse bridge-following reinforcing steel bars to form a reinforcing mesh sheet with the diameter of 100 multiplied by 100 mm;
3) Supporting concrete cushion blocks on the bottom surfaces of longitudinal steel bars of the downcast bridge, wherein the length, the width and the height of the concrete cushion blocks are all 30mm, the concrete cushion blocks are distributed according to a quincuncial shape, and the distance between the concrete cushion blocks is 600 mm;
4) Cleaning the top surface of the concrete box girder top plate, blowing the top surface of the concrete box girder top plate clean by using an air compressor rubber hose tuyere, and sprinkling water to wet the top surface of the concrete box girder top plate under the condition of ensuring that no water is accumulated on the top surface of the concrete box girder top plate;
5) Pouring ultrahigh-performance concrete which is intensively mixed in a mixing station on the top surface of the top plate of the concrete box girder as an ultrahigh-performance concrete layer in the pavement structure of the top surface of the top plate of the concrete box girder, wherein the reinforcing mesh which is bound and distributed on the top surface of the top plate of the concrete box girder in the step 2) is positioned in the ultrahigh-performance concrete layer;
6) Paving the asphalt concrete pavement, after the health preserving period of the ultra-high performance concrete layer poured in the step 5), roughly treating the top surface of the ultra-high performance concrete layer, then spraying a bonding asphalt layer on the top surface of the ultra-high performance concrete layer, intensively mixing the asphalt concrete mixture, transporting a heat preservation transport vehicle, paving by adopting a paver, and rolling and forming by a road roller to complete the construction process of the ultra-high performance concrete combined bridge deck pavement layer structure.
The invention is further configured to: the thickness of the ultra-high performance concrete layer in the step 5) is 100 mm.
The invention is further configured to: the design theory of the ultra-high performance concrete poured in the step 5) adopts the maximum stacking density theory, particles with different particle diameters of the composition materials form the closest stacking according to the optimal proportion, namely, the gaps formed by stacking millimeter-sized particles (aggregates) are filled with micron-sized particles (cement, fly ash and mineral powder), and the gaps formed by stacking the micron-sized particles are filled with submicron-sized particles (silica fume).
In conclusion, the invention has the following beneficial effects: the anti-permeability performance of the concrete bridge deck pavement structure is excellent through the ultra-high performance concrete layer, and the concrete bridge deck pavement structure is suitable for a high-corrosion environment and a circulating freeze-thaw environment; the concrete bridge deck pavement layer structure formed by the concrete box girder top plate, the ultrahigh-performance concrete layer on the top surface of the concrete box girder top plate and the asphalt concrete pavement paved on the top surface of the ultrahigh-performance concrete layer can effectively prevent harmful salt ions from continuously permeating into the concrete on the top surface of the concrete box girder top plate, prolong the service life of the pavement structure and effectively protect the concrete on the top surface of the concrete box girder top plate from being damaged when the pavement asphalt concrete pavement layer is replaced; in addition, the construction method of the ultra-high performance concrete bridge deck pavement layer structure is easy to realize, has low cost and can be widely applied to construction control operation similar to concrete bridge deck pavement.
Drawings
FIG. 1 is a schematic structural view in example 1 of the present invention;
FIG. 2 is a schematic view of the structure of a reinforcing mesh in example 1 of the present invention;
FIG. 3 is a schematic structural view of a reinforcing mesh and a concrete pad in example 1 of the present invention;
fig. 4 is a construction flowchart in embodiment 2 of the present invention.
in the figure: 1. a concrete box girder top plate; 2. an ultra-high performance concrete layer; 3. asphalt concrete pavement; 4. a reinforcing mesh; 5. longitudinal steel bars along the bridge; 6. transverse steel bars along the bridge; 7. lead wire; 8. a concrete pad.
Detailed Description
The invention is described in further detail below with reference to figures 1-4.
example 1: a super high performance concrete composite bridge deck pavement layer structure is shown in figure 1, figure 2 and figure 3, and comprises a concrete box girder top plate 1, a super high performance concrete layer 2 is paved on the top surface of the concrete box girder top plate 1, and the thickness of the super high performance concrete layer 2 is 100 mm. The top surface of the ultra-high performance concrete layer 2 is paved with an asphalt concrete pavement 3. The ultra-high performance concrete layer 2 comprises a reinforcing mesh 4 arranged on the top surface of the concrete box girder top plate 1.
In this embodiment, the concrete surface on the top surface of the top plate 1 of the concrete box girder is subjected to rough treatment in advance by adopting processes such as roughening, milling, shot blasting and the like, and the laying process of the ultra-high performance concrete layer 2 is performed after the rough treatment of the concrete on the top surface of the top plate 1 of the concrete box girder is accepted. The design theory of the poured ultrahigh-performance concrete layer 2 is the maximum packing density theory, and particles with different particle diameters of the composition materials form the closest packing in the optimal proportion, namely, gaps formed by the millimeter-sized particles (aggregates) are filled with micron-sized particles (cement, fly ash and mineral powder), and gaps formed by the micron-sized particles are filled with submicron-sized particles (silica fume). The anti-permeability performance is excellent, and the anti-permeability material can be suitable for high-corrosion environments and circulating freeze-thaw environments. The poured ultrahigh-performance concrete layer 2 is intensively mixed at a mixing station and is transported by a transport tanker, a concrete pump truck pumps the concrete to the top surface of the top plate 1 of the concrete box girder, paving, vibrating and plastering processes are carried out manually, and the height and the flatness of the top surface of the ultrahigh-performance concrete layer 2 are strictly controlled. And (3) after the poured ultrahigh-performance concrete layer 2 is initially set, covering, watering and curing for 7 days. After the curing period is over, the top surface of the ultra-high performance concrete layer 2 is subjected to rough treatment, then the bonding asphalt is sprayed, and the asphalt concrete pavement 3 is paved. The asphalt concrete mixture is intensively mixed, transported by a heat preservation transport vehicle, spread by a spreading machine and rolled and formed by a road roller, and the surface temperature of the asphalt mixture of the asphalt concrete pavement 3 is reduced to 50 ℃, so that the traffic can be opened.
Through the ultra-high performance concrete layer 2, the concrete bridge deck pavement structure has excellent anti-permeability performance and is suitable for high-corrosion environment and circulating freeze-thaw environment. The concrete combined bridge deck pavement layer structure formed by the concrete box girder top plate 1, the ultrahigh-performance concrete layer 2 on the top surface of the concrete box girder top plate 1 and the asphalt concrete pavement 3 paved on the top surface of the ultrahigh-performance concrete layer 2 can effectively prevent harmful salt ions from continuously permeating into the concrete on the top surface of the concrete box girder top plate 1, prolong the service life of the pavement structure, and effectively protect the concrete on the top surface of the concrete box girder top plate 1 from being damaged when the pavement asphalt concrete pavement 3 layer is replaced.
The reinforcing mesh 4 comprises a plurality of longitudinal reinforcing steel bars 5 along the bridge and a plurality of transverse reinforcing steel bars 6 along the bridge. And lead wires 7 are bound at the joints of the longitudinal steel bars 5 and the transverse steel bars 6.
In this embodiment, the longitudinal bridge-following bars 5 and the transverse bridge-following bars 6 are HRB400 bars and have a diameter of 10 mm. The lead wire 7 is 24-size 0.55mm lead wire 7. Through following the vertical reinforcing bar 5 of bridge and following the horizontal reinforcing bar 6 of bridge, be convenient for form reinforcing bar net 4 to be convenient for pour the operation of ultra high performance concrete layer 2. Through the lead wire 7, be convenient for with following the node of bridge longitudinal reinforcement 5 and following bridge horizontal reinforcement 6 and carry out the ligature fixed.
The distance between the longitudinal steel bars 5 along the bridge is 100mm, and the diameter of the longitudinal steel bars 5 along the bridge is 10 mm. The interval between the transverse reinforcing steel bars 6 along the bridge is 100mm, and the diameter of the transverse reinforcing steel bars 6 along the bridge is 10 mm.
in the embodiment, the longitudinal steel bars 5 with the spacing of 100mm and the diameter of 10mm along the bridge and the transverse steel bars 6 with the spacing of 100mm and the diameter of 10mm along the bridge are used for enhancing the integral rigidity and the bending resistance of the ultra-high performance concrete layer 2 formed by pouring the ultra-high performance concrete, so that the pavement structure and the concrete bridge deck have good bonding property and stress deformation coordination capacity, and the service life of the pavement structure can be prolonged.
a plurality of concrete cushion blocks 8 are arranged on the bottom surface of the reinforcing mesh 4, and the length, the width and the height of each concrete cushion block 8 are all 30 mm. The plurality of concrete cushion blocks 8 are distributed in a plum blossom shape, and the distance between the concrete cushion blocks 8 is 600 mm.
In this embodiment, the position of the reinforcing mat 4 is easily fixed by the concrete pads 8 distributed in a quincunx shape. Meanwhile, the concrete cushion block 8 is convenient for preventing the reinforcing mesh 4 from rusting, and the durability of the structure of the ultra-high performance concrete layer 2 is realized.
And the longitudinal steel bar 5 along the bridge and the transverse steel bar 6 along the bridge are arranged in the middle of the height direction of the ultrahigh-performance concrete layer 2.
In this embodiment, in the middle of the bridge longitudinal reinforcement 5 and the bridge transverse reinforcement 6 in the direction of height of the ultra-high performance concrete layer 2, the bonding force between the bridge longitudinal reinforcement 5 and the bridge transverse reinforcement 6 and the ultra-high performance concrete layer 2 is facilitated to be ensured, so that the structural stability of the ultra-high performance concrete layer 2 formed in the bridge longitudinal reinforcement 5, the bridge transverse reinforcement 6 and the poured ultra-high performance concrete layer can be ensured.
Example 2: a construction method of an ultra-high performance concrete combined bridge deck pavement layer structure is shown in figure 4, and specifically comprises the following steps:
1) And (3) rough treatment of the top surface of the concrete box girder top plate 1, wherein the rough treatment is carried out on the top surface of the concrete box girder top plate 1 by adopting the processes of roughening, milling and shot blasting.
2) Reinforcing mesh 4 is laid in the ligature, 1 top surface at the concrete box girder roof is according to 100 mm's equidistant arrangement along the bridge to the fore-and-aft diameter be 10mm along the longitudinal diameter of bridge vertical reinforcement 5, then along the top surface of bridge vertical reinforcement 5 at 1 top surface at the concrete box girder roof, according to 100mm equidistant arrangement along the bridge to the horizontal diameter of 10mm along the bridge horizontal reinforcement 6, and on following each node of bridge vertical reinforcement 5 and along the bridge horizontal reinforcement 6, adopt diameter to be 0.55mm 24 # lead wire 7 will follow the longitudinal reinforcement 5 of bridge and follow the bridge horizontal reinforcement 6 ligature firmly, form 100 x 100 mm's reinforcing mesh 4 piece.
3) the concrete cushion blocks 8 are supported on the bottom surfaces of the longitudinal steel bars 5 of the bridge, the length, the width and the height of each concrete cushion block 8 are all 30mm, the concrete cushion blocks 8 are distributed according to the quincuncial shape, and the distance between the concrete cushion blocks 8 is 600 mm.
4) Clean 1 top surface of concrete box girder roof, adopt air compressor machine rubber tube tuyere to blow 1 top surface of concrete box girder roof clean to do 1 top surface of concrete box girder roof watering moist under the condition of guaranteeing that 1 top surface of concrete box girder roof does not have ponding.
5) Pouring the ultra-high performance concrete which is intensively mixed in the mixing station on the top surface of the concrete box girder top plate 1 to serve as the ultra-high performance concrete layer 2 in the top surface paving structure of the concrete box girder top plate 1, wherein the reinforcing mesh 4 which is bound and distributed on the top surface of the concrete box girder top plate 1 in the step 2) is positioned in the ultra-high performance concrete layer 2.
6) Paving the asphalt concrete pavement 3, after the health-preserving period of the ultra-high performance concrete layer 2 poured in the step 5) expires, carrying out rough treatment on the top surface of the ultra-high performance concrete layer 2, then spraying a bonding asphalt layer on the top surface of the ultra-high performance concrete layer 2, intensively mixing the asphalt concrete mixture, transporting a heat-preserving transport vehicle, paving by adopting a paver, and carrying out rolling forming by a road roller to complete the construction process of the ultra-high performance concrete combined bridge deck pavement layer structure.
The thickness of the ultra-high performance concrete layer 2 in the step 5) is 100 mm.
the design theory of the ultra-high performance concrete poured in the step 5) adopts the maximum stacking density theory, particles with different particle diameters of the composition materials form the closest stacking according to the optimal proportion, namely, the gaps formed by stacking millimeter-sized particles (aggregates) are filled with micron-sized particles (cement, fly ash and mineral powder), and the gaps formed by stacking the micron-sized particles are filled with submicron-sized particles (silica fume).
the working principle is as follows: in the construction process of paving the ultrahigh-performance concrete combined bridge deck pavement layer structure, the concrete surface on the top surface of the top plate 1 of the concrete box girder is subjected to rough treatment by adopting the processes of roughening, milling, blasting and the like. After the rough treatment and acceptance of the concrete surface on the top surface of the concrete box girder top plate 1 are qualified, a reinforcing mesh 4 in the ultra-high performance concrete layer 2 with the thickness of 100mm is distributed on the top surface of the concrete box girder top plate 1. The reinforcing mesh 4 comprises longitudinal reinforcing steel bars 5 which are arranged at equal intervals of 100mm along the bridge direction and transverse reinforcing steel bars 6 which are arranged at equal intervals of 100mm along the bridge direction and arranged at equal intervals of 100mm along the transverse bridge direction of the top surface of the longitudinal reinforcing steel bars of the bridge on the top plate of the concrete box girder. And (3) firmly binding the longitudinal and transverse reinforcing steel bars by using 24-size 0.55mm lead wires 7 on each node of the longitudinal reinforcing steel bars 5 along the bridge and the transverse reinforcing steel bars 6 along the bridge to form 100 x 100mm reinforcing mesh 4 pieces. Concrete cushion blocks 8 with the length, width and height of 30mm are arranged on the bottom surface of the longitudinal steel bar 5 of the bridge in a plum blossom shape, and the distance between the concrete cushion blocks 8 is 600 mm. And then, blowing the top surface of the top plate 1 of the concrete box girder completely by using a rubber hose air nozzle of an air compressor, sprinkling water on the top surface of the top plate 1 of the concrete box girder to moisten the top surface, and preventing water from being accumulated on the top surface of the top plate 1 of the concrete box girder. Then pouring the ultra-high performance concrete. And (3) after pouring the ultrahigh-performance concrete and initially setting, covering and watering for curing, wherein the curing period is 7 days. After the curing period is over, the top surface of the ultra-high performance concrete layer 2 formed by pouring the ultra-high performance concrete is subjected to rough treatment, bonding asphalt is sprayed, and the asphalt concrete pavement 3 is paved, so that the ultra-high performance concrete combined bridge deck pavement layer structure is paved. Through the ultra-high performance concrete layer 2, the concrete bridge deck pavement structure has excellent anti-permeability performance and is suitable for high-corrosion environment and circulating freeze-thaw environment. The concrete combined bridge deck pavement layer structure consisting of the concrete box girder top plate 1, the ultrahigh-performance concrete layer 2 on the top surface of the concrete box girder top plate 1 and the asphalt concrete pavement 3 paved on the top surface of the ultrahigh-performance concrete layer 2 can effectively prevent harmful salt ions from continuously permeating into the concrete on the top surface of the concrete box girder top plate 1, prolong the service life of the pavement structure and effectively protect the concrete on the top surface of the concrete box girder top plate 1 from being damaged when the pavement asphalt concrete pavement 3 layer is replaced; in addition, the construction method of the ultra-high performance concrete combined bridge deck pavement layer structure is easy to realize, has low cost and can be widely applied to construction control operation similar to concrete bridge deck pavement.
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 of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides an ultra high performance concrete combination bridge deck pavement layer structure, includes concrete box girder roof board (1), characterized by: the top surface of the concrete box girder top plate (1) is provided with an ultrahigh-performance concrete layer (2), and the thickness of the ultrahigh-performance concrete layer (2) is 100 mm; the top surface of the ultra-high performance concrete layer (2) is paved with an asphalt concrete pavement (3); the ultra-high performance concrete layer (2) comprises a reinforcing mesh (4) arranged on the top surface of the concrete box girder top plate (1).
2. the ultra-high performance concrete composite deck pavement layer structure of claim 1, wherein: the reinforcing mesh (4) comprises a plurality of longitudinal reinforcing steel bars (5) along the bridge and a plurality of transverse reinforcing steel bars (6) along the bridge; and lead wires (7) are bound at the joints of the longitudinal steel bars (5) and the transverse steel bars (6) of the bridge.
3. The ultra-high performance concrete composite deck pavement layer structure of claim 2, wherein: the space between the longitudinal steel bars (5) along the bridge is 100mm, and the diameter of the longitudinal steel bars (5) along the bridge is 10 mm; be 100mm in the same direction as the interval between the horizontal reinforcing bar of bridge (6), just in the same direction as the diameter of the horizontal reinforcing bar of bridge (6) is 10 mm.
4. The ultra-high performance concrete composite deck pavement layer structure of claim 1, wherein: the bottom surface of the reinforcing mesh (4) is provided with a plurality of concrete cushion blocks (8), and the length, width and height of each concrete cushion block (8) are all 30 mm; the concrete cushion blocks (8) are distributed in a plum blossom shape, and the distance between the concrete cushion blocks (8) is 600 mm.
5. The ultra-high performance concrete composite deck pavement layer structure of claim 2, wherein: the longitudinal steel bars (5) and the transverse steel bars (6) are arranged in the middle of the ultra-high performance concrete layer (2) in the height direction.
6. A construction method of an ultra-high performance concrete combined bridge deck pavement layer structure is characterized by comprising the following steps: the method specifically comprises the following steps:
1) The top surface of the concrete box girder top plate (1) is subjected to rough treatment, and the top surface of the concrete box girder top plate (1) is subjected to rough treatment by adopting chiseling, milling and shot blasting processes;
2) Binding and laying a reinforcing mesh (4), arranging longitudinal bridge-following reinforcements (5) with the diameter of 10mm along the longitudinal bridge direction at the top surface of the concrete box girder top plate (1) at equal intervals of 100mm, then arranging transverse bridge-following reinforcements (6) with the diameter of 10mm along the transverse bridge direction at the top surface of the longitudinal bridge-following reinforcements (5) at the top surface of the concrete box girder top plate (1) at equal intervals of 100mm, and firmly binding the longitudinal bridge-following reinforcements (5) and the transverse bridge-following reinforcements (6) at each node of the longitudinal bridge-following reinforcements (5) and the transverse bridge-following reinforcements (6) by adopting No. 24 lead wires (7) with the diameter of 0.55mm to form a reinforcing mesh (4) sheet with the diameter of 100 multiplied by 100 mm;
3) the concrete cushion blocks (8) are supported on the bottom surfaces of the longitudinal steel bars (5) of the downbridge, the length, the width and the height of the concrete cushion blocks (8) are all 30mm, the concrete cushion blocks (8) are distributed according to a quincuncial shape, and the distance between the concrete cushion blocks (8) is 600 mm;
4) cleaning the top surface of the concrete box girder top plate (1), blowing the top surface of the concrete box girder top plate (1) clean by using an air compressor rubber hose tuyere, and sprinkling water to wet the top surface of the concrete box girder top plate (1) under the condition of ensuring that no water is accumulated on the top surface of the concrete box girder top plate (1);
5) Pouring the ultra-high performance concrete which is intensively mixed in the mixing station on the top surface of the concrete box girder top plate (1) to serve as the ultra-high performance concrete layer (2) in the pavement structure on the top surface of the concrete box girder top plate (1), wherein the reinforcing mesh (4) bound and distributed on the top surface of the concrete box girder top plate (1) in the step 2) is positioned in the ultra-high performance concrete layer (2);
6) Paving the bituminous concrete pavement (3), after the health preserving period of the ultra-high performance concrete layer (2) poured in the step 5) expires, carrying out rough treatment on the top surface of the ultra-high performance concrete layer (2), then spraying a bonding bituminous layer on the top surface of the ultra-high performance concrete layer (2), intensively mixing the bituminous concrete mixture, transporting by a heat preservation transport vehicle, adopting a paver, and carrying out rolling forming by a road roller to complete the construction process of the ultra-high performance concrete combined bridge deck pavement layer structure.
7. The method for constructing an ultra-high performance concrete composite deck pavement layer structure as claimed in claim 6, wherein: the thickness of the ultra-high performance concrete layer (2) in the step 5) is 100 mm.
8. The method for constructing an ultra-high performance concrete composite deck pavement layer structure as claimed in claim 6, wherein: the design theory of the ultra-high performance concrete poured in the step 5) adopts the maximum stacking density theory, particles with different particle diameters of the composition materials form the closest stacking according to the optimal proportion, namely, the gaps formed by stacking millimeter-sized particles (aggregates) are filled with micron-sized particles (cement, fly ash and mineral powder), and the gaps formed by stacking the micron-sized particles are filled with submicron-sized particles (silica fume).
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