CN112267385A - Paving method of steel bridge deck stiffening pouring type asphalt mixture - Google Patents
Paving method of steel bridge deck stiffening pouring type asphalt mixture Download PDFInfo
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- CN112267385A CN112267385A CN202011221070.1A CN202011221070A CN112267385A CN 112267385 A CN112267385 A CN 112267385A CN 202011221070 A CN202011221070 A CN 202011221070A CN 112267385 A CN112267385 A CN 112267385A
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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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4806—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing
- E01C19/4826—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing the materials being aggregate mixed with binders
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
- E01C7/325—Joining different layers, e.g. by adhesive layers; Intermediate layers, e.g. for the escape of water vapour, for spreading stresses
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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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Abstract
The invention discloses a method for paving a steel bridge deck stiffening cast asphalt mixture, which sequentially comprises a steel plate, a waterproof adhesive layer, a protective layer and a wearing layer from bottom to top, wherein the protective layer is the stiffening cast asphalt mixture and comprises a lower layer cast asphalt mixture, a middle layer grid and an upper layer cast asphalt mixture from bottom to top, and the protective layer is paved according to the following steps: step 1): unloading the cast asphalt mixture to the waterproof adhesive layer by using the special transport vehicle for the cast asphalt mixture, and paving the mixture by using a first paver to form the lower-layer cast asphalt mixture; step 2): immediately spreading a grid on the lower layer pouring type asphalt mixture to form the middle layer grid; step 3): and immediately feeding the cast asphalt mixture onto the middle layer of grid by adopting the lateral feeding machine, and paving the mixture by adopting a second paver to form the upper layer of cast asphalt mixture.
Description
Technical Field
The invention relates to a paving method of a steel bridge deck, in particular to a paving method of a steel bridge deck stiffening pouring type asphalt mixture.
Background
The pouring type asphalt mixture has good water tightness, strong free deformation capability and good durability, the steel bridge deck pavement taking the pouring type asphalt mixture as a main body is a pavement structure which is the most widely applied in China at present, but the pouring type asphalt mixture has large oilstone ratio and more fine aggregates, and an embedding and extruding structure is not formed among coarse aggregates, so that the pouring type asphalt mixture has relatively poor high-temperature anti-load capability compared with asphalt mixtures with other structural types, and is difficult to meet the requirements of special use conditions such as high-temperature heavy load and the like on the steel bridge deck pavement.
In chinese patent CN101368368A, a paving method of a large-span steel box girder bridge deck anti-pushing combined structure is disclosed, and specifically discloses: the paving method of the large-span steel box girder bridge deck anti-pushing combined structure is characterized by comprising the following steps of: 1) pretreating a steel plate of the steel box girder bridge floor: sand blasting and rust removing: blasting sand on a steel plate on the bridge surface of the steel box girder to remove rust; coating a waterproof anticorrosive layer: coating a high-temperature-resistant waterproof anticorrosive material on the steel plate subjected to sand blasting and rust removal; the high-temperature-resistant waterproof and anticorrosive material is an Eliminator waterproof material or epoxy zinc-rich paint provided by Shenzhen Huashiye anticorrosion technology engineering Limited; 2) welding of shear nailsAnd (2) connecting: arranging the shear nails at intervals of (35-45) cm multiplied by (35-45) cm, and welding the shear nails on the steel plate of the bridge deck of the steel box girder; 3) and (3) binding of a reinforcing mesh: fixing a reinforcing mesh with the mesh size of (95-105) multiplied by (95-105) mm on the shear nails, wherein the distance H3 between the reinforcing mesh and the top surfaces of the shear nails is 0.6-0.8H 1, and H1 is the height of the shear nails; 4) grading the mineral aggregate: the mineral aggregate consists of coarse aggregate, fine aggregate and filler; 5) preparing and paving the cast asphalt concrete: selection of raw materials: the cast asphalt concrete consists of mineral aggregate, high-viscosity modified asphalt, an additive and fibers, wherein the mass ratio of the mineral aggregate to the high-viscosity modified asphalt to the additive to the fibers is 100: 7-10: 2.5-5: 0 to 0.6; ② preparation: mixing and stirring mineral aggregate, high-viscosity modified asphalt, an admixture and fibers at the temperature of 170-200 ℃, wherein the discharging temperature is not lower than 170 ℃, and preparing the cast asphalt concrete with the fluidity of less than 20 s; thirdly, paving: pouring a layer of 4-8cm of pouring asphalt concrete on the steel plate welded with the shear nails to form a pouring asphalt concrete layer; 6) paving a waterproof adhesive layer: firstly, spraying a layer of high-viscosity modified asphalt on the surface of a cast asphalt concrete layer, wherein the thickness of the sprayed high-viscosity modified asphalt is 1-3 mm, and then, spraying a layer of basalt macadam with the particle size of 2.36-4.75 mm, wherein the spraying amount is 3.0-4.0 kg/m2Forming a waterproof adhesive layer; 7) paving an anti-skid noise-reduction wearing layer: laying an anti-sliding noise-reducing wearing layer on the waterproof bonding layer, wherein the thickness of the anti-sliding noise-reducing wearing layer is 3-5 cm; the material of the anti-skid noise-reducing wearing layer is SMA asphalt concrete or open-graded asphalt concrete (namely OGFC asphalt concrete).
In the patent, the shear nails are welded on the steel plate, the reinforcing mesh is tied between the shear nails, and then the pouring asphalt paving process is carried out, so that the asphalt concrete and the steel plate are not debonded, and the asphalt concrete is not pushed under heavy load. In fact, according to the experiments of the technicians in the field, the qualified steel bridge pavement cannot be paved by adopting the process. The reason is that: 1. by adopting the construction method disclosed by the patent, the poured asphalt needs to be filled between the steel plate and the shear nails and the reinforcing mesh after flowing out of the paver, in fact, the temperature of the poured asphalt is gradually reduced after flowing out of the paver, the fluidity is reduced along with the reduction of the temperature, and the fluidity is reduced along with the reduction of the fluidity, so that the poured asphalt is also obstructed by the shear nails and the reinforcing mesh, the poured asphalt cannot be fully filled between the steel plate and the shear nails and the reinforcing mesh, the filling integrity of the asphalt mixture cannot be ensured, and the construction qualified standard cannot be met. 2. Even fill pouring type bituminous mixture and enter into between steel sheet, shear force nail and the reinforcing bar net, also can't adopt the paver to pave because the shear force nail can influence the spreading board work of paver, can't pave bituminous mixture and the flattening, and then can't reach the construction standard of conformity. 3. In the patent, the pouring type asphalt mixture is poured among the steel plate, the shear nails and the reinforcing mesh at one time, and pouring with the thickness of 4-8cm is carried out, so that the flow rate is slowed down and the temperature is reduced due to the influence of the temperature, the shear nails and the reinforcing mesh during pouring, and meanwhile, the asphalt mixture is separated, so that the final formed bridge deck pavement quality of the steel box girder is extremely poor.
In addition, in the above patent, after the shear nails are welded with the steel bridge deck, the reinforcing mesh is bound on the shear nails, so the construction process is complex, the construction time is long, and the second steel bridge deck is difficult to maintain if the second steel bridge deck is damaged.
Disclosure of Invention
The invention aims to provide a method for paving a steel bridge deck stiffening cast asphalt mixture with good bearing capacity and high-temperature anti-rutting capacity.
Wherein, the stiffening means improving the performance of the cast asphalt concrete through structural improvement.
In order to achieve the above object, the present invention is configured such that: the paving method of the steel bridge deck stiffening pouring type asphalt mixture is characterized by comprising the following steps of: include steel sheet, anticorrosive coating, waterproof adhesive layer, protective layer, cohere and wearing and tearing layer by supreme down in proper order, the protective layer is the pouring type bituminous mixture of putting more energy into, just the protective layer is by supreme lower floor pouring type bituminous mixture, middle level grid and the upper pouring type bituminous mixture of including down, just the protective layer is mated formation according to following step:
step 1): the special transport vehicle for the cast asphalt mixture and the first paver are adopted, the special transport vehicle for the cast asphalt mixture unloads the cast asphalt mixture to the waterproof adhesive layer, and the first paver is adopted to pave the mixture to form the lower-layer cast asphalt mixture;
step 2): immediately paving a grid on the lower layer pouring type asphalt mixture to form the middle layer grid after paving the lower layer pouring type asphalt mixture; and rolling the middle layer grating by a roller to embed the grating into the mixture.
Step 3): adopting a lateral feeder and a second paver, immediately feeding a pouring type asphalt mixture on the middle-layer grating from the side surface by adopting the lateral feeder after the middle-layer grating is paved, and paving the mixture by adopting the second paver to form the upper-layer pouring type asphalt mixture, wherein a thermal interface is ensured between the upper-layer pouring type asphalt mixture and the lower-layer pouring type asphalt mixture during paving, and the grating can be embedded into the mixture;
the grating is a warp-knitted glass fiber grating or a warp-knitted basalt grating, and the surface soakage of the grating contains modified asphalt.
Preferably, the temperature of the lower layer cast asphalt mixture and the upper layer cast asphalt mixture is 180-240 ℃ during paving, the grid is paved on the lower layer cast asphalt mixture, then the grid is immediately rolled by a roller, and then the upper layer cast asphalt mixture is paved.
Preferably, the thickness of the protective layer is 40-50 mm.
Preferably, the thickness of the lower layer pouring type asphalt mixture is 20-25 mm, and the thickness of the upper layer pouring type asphalt mixture is 20-25 mm.
Preferably, a premixed gravel layer is further arranged on the protective layer, the premixed gravel layer is made of premixed gravel with the particle size of 4.75-9.5 mm, and the using amount of the premixed gravel is 4-7 kg/m2。
Further, be provided with the track in construction area's both sides, first paver, second paver are all along rail running, the grid is rolled up on the grid machine, the grid machine is located between first paver and the second paver, just the grid machine both ends are equipped with the gyro wheel with track matched with.
Preferably, the anticorrosive layer is one of acrylic acid anticorrosive paint and epoxy zinc-rich paint, the waterproof adhesive layer is one of a methyl methacrylate resin waterproof system, an epoxy resin adhesive or a solvent type adhesive, an adhesive layer is arranged between the protective layer and the wearing layer, the adhesive layer is one of modified emulsified asphalt and an epoxy asphalt adhesive, and the wearing layer is one of modified asphalt SMA, epoxy asphalt concrete EA or modified asphalt AC.
The paving method of the steel bridge deck stiffening pouring type asphalt mixture is characterized by comprising the following steps of: paving the floor according to the following steps:
the method comprises the following steps: carrying out sand blasting and rust removal on the steel plate to achieve the cleanliness of Sa2.5 grade and the roughness of 50-140 microns;
step two: and (3) constructing an anticorrosive coating:
1) if the anticorrosive coating adopts acrylic acid anticorrosive paint, the using amount is 0.1-0.2 kg/m2；
2) If the anticorrosive layer is made of epoxy zinc-rich paint, the thickness is 50-140 mu m;
step three, constructing a waterproof adhesive layer:
1) if the waterproof adhesive layer adopts a methyl methacrylate resin waterproof system: comprises a methyl methacrylate resin film and an acrylic resin adhesive. The methyl methacrylate resin film is generally constructed in two layers, the total thickness of the two layers is 2mm, and the dosage is 2.5-3.5 kg/m2(ii) a Applying an acrylic resin adhesive on the methyl methacrylate resin layer in an amount of 0.15-0.2 kg/m2。
2) If the waterproof adhesive layer adopts an epoxy resin adhesive: the amount of the epoxy resin binder is 0.4-0.5 kg/m2。
3) If the waterproof adhesive layer adopts a solvent type adhesive: the amount of the solvent-based adhesive is 0.2 to 0.4kg/m2。
Step four: construction of protective layer
1) Adopting a special transport vehicle for the cast asphalt mixture and a first spreading machine, unloading the cast asphalt mixture to the base surface treated in the third step by the special transport vehicle for the cast asphalt mixture, and spreading the mixture by the first spreading machine to form the lower-layer cast asphalt mixture with the thickness of 20-25 mm;
2) immediately paving a grid on the lower layer pouring type asphalt mixture to form the middle layer grid after paving the lower layer pouring type asphalt mixture; immediately rolling the paved grating by a roller to ensure the effective adhesion of the grating and the cast asphalt mixture;
3) adopting a lateral feeder and a second paver, immediately feeding a pouring type asphalt mixture onto the middle-layer grid from the side surface by adopting the lateral feeder after the middle-layer grid is paved, and paving the mixture by adopting the second paver to form the upper-layer pouring type asphalt mixture with the thickness of 20-25 mm, wherein a thermal interface is ensured between the upper-layer pouring type asphalt mixture and the lower-layer pouring type asphalt mixture during paving, and the grid can be embedded into the mixture;
step five: construction of premixed macadam; spreading pre-mixed macadam with the particle size of 4.75-9.5 mm on the upper-layer casting type asphalt mixture, wherein the using amount of the pre-mixed macadam is 4-7 kg/m2Then, rolling the premixed macadam layer by adopting a macadam rolling machine to enable the premixed macadam to be partially embedded into the cast asphalt mixture;
step six: construction of a sticky layer;
1) if the adhesive layer is modified emulsified asphalt, the dosage is 0.3-0.5 kg/m2；
2) If the adhesive layer adopts epoxy resin adhesive, the dosage is 0.5-0.6 kg/m2
Step seven: constructing a wearing layer; the wearing layer is made of one of modified asphalt SMA, epoxy asphalt concrete EA or modified asphalt AC, the thickness of the wearing layer is 25-40 mm, and after paving of the wearing layer is finished, a road roller is used for rolling the constructed road surface.
Has the advantages that:
the paving method of the steel bridge deck stiffening pouring type asphalt mixture has the following beneficial effects: 1. carrying capacity: the pouring type asphalt mixture is used as a matrix, the integral grid is added into the mixture, the fluidity of the pouring type asphalt mixture during high-temperature paving is fully utilized, and the good bonding performance of the pouring type asphalt mixture and the grid is utilized, so that a novel paving structure with high integral bearing capacity is formed. 2. High-temperature stability: the rutting dynamic stability of the stiffening cast asphalt mixture constructed by the paving method of the steel bridge deck stiffening cast asphalt mixture is improved by more than 60 percent compared with the cast asphalt mixture without the grid. 3. Low-temperature crack resistance: the ultimate failure strain of the stiffening cast asphalt mixture constructed by the paving method of the steel bridge deck stiffening cast asphalt mixture is more than 10 times of that of the cast asphalt mixture without the grid at the temperature of minus 10 ℃, and the impact toughness of the stiffening cast asphalt mixture at the temperature of minus 10 ℃ is more than 25 times of that of the cast asphalt mixture without the grid. That is, the low temperature crack resistance of the reinforced cast asphalt mixture of the present invention is much better than the existing cast asphalt mixture that is not reinforced. 4. Fatigue durability of composite structure: the stiffening cast asphalt mixture pavement constructed by the method for paving the steel bridge deck stiffening cast asphalt mixture can greatly delay the expansion of cracks to the lower layer through the grids, and the split fatigue times of the combined structure are improved by more than 20 times.
Drawings
FIG. 1 is a schematic view of a load bearing structure of a conventional cast asphalt pavement;
FIG. 2 is a schematic view of the reinforced cast asphalt pavement load bearing of the present invention;
FIG. 3 is a schematic view of a structure of a stiffening pouring asphalt pavement composite structure fracture fatigue test device;
FIG. 4 is a test piece cracking diagram after a common cast asphalt pavement combined structure cleavage fatigue test;
FIG. 5 is a graph showing the cracking of a test piece after a split test of a reinforced cast asphalt pavement composite structure.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments will still fall within the scope of the present invention as claimed in the claims.
Example 1: the embodiment provides a method for paving a steel bridge deck stiffening pouring type asphalt mixture, and the steel bridge deck pouring type asphalt concrete pavement in the embodiment sequentially comprises a steel plate, an anticorrosive layer, a waterproof adhesive layer, a protective layer, an adhesive layer and a wearing layer from bottom to top. The protective layer is a stiffening pouring type asphalt mixture, comprises a lower pouring type asphalt mixture, a middle layer grid and an upper pouring type asphalt mixture from bottom to top, and is paved according to the following steps:
step 1) adopting a special pouring asphalt mixture transport vehicle and a first paver, unloading the pouring asphalt mixture to the waterproof adhesive layer by the special pouring asphalt mixture transport vehicle, and paving the mixture by the first paver to form the lower-layer pouring asphalt mixture;
step 2) immediately paving a grid on the lower layer pouring type asphalt mixture to form a middle layer grid after the lower layer pouring type asphalt mixture is paved; immediately rolling the middle layer grating by a roller to embed the grating into the mixture;
step 3) adopting a lateral feeder and a second paver, immediately feeding the cast asphalt mixture onto the middle-layer grating from the side surface by adopting the lateral feeder after the middle-layer grating is paved, paving the mixture by adopting the second paver to form the upper-layer cast asphalt mixture, and ensuring that a thermal interface is formed between the upper-layer cast asphalt mixture and the lower-layer cast asphalt mixture and the grating can be embedded into the mixture during paving;
the grating is a warp-knitted glass fiber grating, and the surface soakage of the grating contains modified asphalt.
In the embodiment, the discharging temperature of the cast asphalt concrete is 220-240 ℃, and the temperature during paving is more than 170 ℃. When the lower layer of the cast asphalt mixture is paved, the grid is immediately paved on the lower layer of the cast asphalt mixture, and the grid can be better embedded into the cast asphalt mixture by utilizing the shrinkage of the weaving line of the grid under the high temperature (150-200 ℃) of the asphalt mixture. In addition, the surface soakage of the grating contains modified asphalt and can be effectively bonded with the cast asphalt mixture, so that the interface of the grating and the cast asphalt mixture can be well combined to form a whole.
In addition, after the grids are laid on the lower layer pouring type asphalt mixture, the grids are immediately rolled by a roller so as to ensure that the grid meshes are effectively bonded with the pouring type asphalt mixture, and then the upper layer pouring type asphalt mixture is laid.
In this embodiment, the thickness of the protective layer is 40 to 50 mm. The thickness of the lower layer casting type asphalt mixture can be selected to be 20mm, and the thickness of the upper layer casting type asphalt mixture is selected to be 20 mm; or the thickness of the lower layer casting type asphalt mixture is 25mm, and the thickness of the upper layer casting type asphalt mixture is 25 mm; or the thickness of the lower layer casting type asphalt mixture is 25mm, and the thickness of the upper layer casting type asphalt mixture is 20 mm; or the thickness of the lower layer pouring type asphalt mixture is 20mm, and the thickness of the upper layer pouring type asphalt mixture is 25 mm.
The paving method of the steel bridge deck stiffening pouring type asphalt mixture has the following beneficial effects:
1. carrying capacity: the pouring type asphalt mixture is used as a matrix, the grid is added into the mixture, the fluidity of the pouring type asphalt mixture during high-temperature paving is fully utilized, and the good bonding performance of the pouring type asphalt mixture and the grid is utilized, so that a novel paving structure with high integral bearing capacity is formed.
2. High-temperature stability: the dynamic stability of the rut at 60 ℃ of the stiffening cast asphalt mixture constructed by the paving method of the steel bridge deck stiffening cast asphalt mixture is improved by more than 60 percent compared with the cast asphalt mixture without the grid.
3. Low-temperature crack resistance: the ultimate failure strain at-10 ℃ of the stiffening cast asphalt mixture constructed by the paving method of the steel bridge deck stiffening cast asphalt mixture of the embodiment is more than 10 times that of the cast asphalt mixture without the grid, and the impact toughness at-10 ℃ of the stiffening cast asphalt mixture is more than 25 times that of the cast asphalt mixture without the grid. That is, the low temperature crack resistance of the reinforced cast asphalt mixture of this example is much better than the existing cast asphalt mixture without reinforcement.
4. Fatigue durability of composite structure: the stiffening cast asphalt mixture pavement constructed by the steel bridge deck stiffening cast asphalt mixture pavement method of the embodiment can greatly delay the expansion of cracks to the lower layer through the grids, and the split fatigue frequency of the combined structure is improved by more than 20 times.
Example 2: as shown in fig. 1-5, the embodiment provides a method for paving a steel bridge deck reinforced cast asphalt mixture, and the steel bridge deck reinforced cast asphalt concrete in the embodiment sequentially includes, from bottom to top, a steel plate, an anti-corrosion layer, a waterproof adhesive layer, a protective layer, a pre-mixed crushed stone layer, an adhesive layer, and an abrasion layer. The waterproof adhesive layer sequentially comprises a layer of acrylic acid anticorrosive paint, two layers of methyl methacrylate resin and a layer of acrylic acid adhesive from bottom to top. The protective layer is a stiffening pouring type asphalt mixture, and comprises a lower layer pouring type asphalt mixture, a middle layer grid and an upper layer pouring type asphalt mixture from bottom to top. The adhesive layer is made of modified emulsified asphalt, and the wearing layer is made of high-elasticity modified asphalt SMA 10. Paving the floor according to the following steps:
the method comprises the following steps: carrying out sand blasting and rust removal on the steel plate to achieve the cleanliness of Sa2.5 grade and the roughness of 50-140 microns;
step two: and (3) constructing an anticorrosive coating: the anticorrosive layer is acrylic acid anticorrosive paint with the dosage of 0.1-0.2 kg/m2. In another embodiment of the present invention, the anti-corrosion layer is, for example, epoxy zinc-rich paint, and has a thickness of 50 to 140 μm.
Step three, constructing a waterproof adhesive layer:
1) construction of methyl methacrylate resin: the methyl methacrylate resin is generally constructed in two layers, the total thickness of the two layers is 2mm, and the dosage is 2.5-3.5 kg/m2；
2) Constructing a bonding layer; the adhesive layer adopts acrylic resin adhesiveThe amount is 0.15-0.20 kg/m2(ii) a As another embodiment in this example: if the waterproof adhesive layer adopts an epoxy resin adhesive: the amount of the epoxy resin binder is 0.4-0.5 kg/m2(ii) a Or if the waterproof adhesive layer adopts a solvent-based adhesive: the amount of the solvent-based adhesive is 0.2 to 0.4kg/m2。
Step four: construction of protective layer
1) Adopting a special transport vehicle for the cast asphalt mixture and a first spreading machine, unloading the cast asphalt mixture to the base surface treated in the third step by the special transport vehicle for the cast asphalt mixture, and spreading the mixture by the first spreading machine to form the lower-layer cast asphalt mixture;
2) immediately paving a grid on the lower layer pouring type asphalt mixture to form the middle layer grid after the lower layer pouring type asphalt mixture is paved; and immediately rolling the paved grid by adopting a roller to ensure the effective adhesion of the grid and the cast asphalt mixture;
3) adopting a lateral feeder and a second paver, immediately feeding a pouring type asphalt mixture onto the middle-layer grating from the side surface by adopting the lateral feeder after the middle-layer grating is paved, and paving the mixture by adopting the second paver to form the upper-layer pouring type asphalt mixture, wherein a thermal interface is ensured between the upper-layer pouring type asphalt mixture and the lower-layer pouring type asphalt mixture during paving, and the grating can be embedded into the mixture;
step five: construction of premixed macadam; spreading pre-mixed macadam with the particle size of 4.75-9.5 mm on the upper-layer casting type asphalt mixture, wherein the using amount of the pre-mixed macadam is 4-7 kg/m2；
Step six: construction of a sticky layer; the adhesive layer is made of modified emulsified asphalt, and the dosage of the modified emulsified asphalt is 0.3-0.5 kg/m2(ii) a As another embodiment of this embodiment, the adhesive layer is made of epoxy resin adhesive and is used in an amount of 0.5 to 0.6kg/m2.
Step seven: constructing a wearing layer; the wearing layer is made of high-elastic modified asphalt SMA and is 25-40 mm thick, and after paving of the wearing layer is completed, a road roller is used for rolling the constructed road surface. In another embodiment of the present invention, the wearing layer is made of one of epoxy asphalt concrete EA or modified asphalt AC, and has a thickness of 25 to 40 mm.
In this embodiment, be provided with the track in the both sides of construction area, first paver, second paver are all along rail-engaging, the grid is rolled up on the grid car, the grid car is located between first paver and the second paver, just grid car both ends are equipped with the gyro wheel with track matched with.
The special transport vehicle for the pouring asphalt mixture can directly walk on a base surface to unload, and when the upper layer pouring asphalt mixture is constructed, the temperature of the lower layer pouring asphalt mixture is still higher, the strength of the mixture is not enough, and the second transport vehicle cannot directly walk on the upper layer pouring asphalt mixture, so that a lateral feeder is adopted to feed from the side.
The paving method of the steel bridge deck stiffening pouring type asphalt mixture has the following beneficial effects:
1. carrying capacity: the pouring type asphalt mixture is used as a matrix, the grid is added into the mixture, the fluidity of the pouring type asphalt mixture during high-temperature paving is fully utilized, and the good bonding performance of the pouring type asphalt mixture and the grid is utilized, so that a novel paving structure with high integral bearing capacity is formed. As shown in fig. 1 and 2, fig. 1 shows a conventional cast asphalt pavement which is not stiffened, and when the pavement is loaded, the load is dispersed to the periphery after being transmitted to a cast asphalt mixture layer GA through a wearing layer SMA. Fig. 2 shows a reinforced cast asphalt pavement constructed by the paving method of the embodiment, wherein when the pavement is loaded, the load is transmitted to the cast asphalt mixture layer GA through the wearing layer SMA and then is dispersed all around. However, it is obvious that the grid mesh layer is arranged in the cast asphalt mixture in the embodiment, and when a force is applied to the grid, the load can be diffused to a larger range under the integrity of the grid mesh layer, so that the stress range is correspondingly enlarged, the pressure intensity is reduced, and the steel bridge pavement can bear larger load without cracking.
2. High-temperature stability: as shown in the table below, the dynamic stability of rutting at 60 ℃ of the reinforced cast asphalt mixture constructed by the paving method of the reinforced cast asphalt mixture for steel bridge deck of the present embodiment is improved by 77.86% compared with the cast asphalt mixture without grid.
3. Low-temperature crack resistance: as shown in the following table, the ultimate failure strain at-10 ℃ of the reinforced cast asphalt mixture constructed by the paving method of the steel bridge deck reinforced cast asphalt mixture of the present embodiment is 13.61 times that of the cast asphalt mixture without the grid, and the impact toughness at-10 ℃ of the reinforced cast asphalt mixture is 28.11 times that of the cast asphalt mixture without the grid. That is, the low temperature crack resistance of the reinforced cast asphalt mixture of this example is much better than the existing unreinforced cast asphalt mixture layer.
4. Fatigue durability of composite structure: the stiffening cast asphalt mixture pavement constructed by the steel bridge deck stiffening cast asphalt mixture pavement method of the embodiment can greatly delay the expansion of cracks to the lower layer through the grids, and the split fatigue frequency of the combined structure is improved by more than 20 times.
FIG. 3 is a schematic view of a split fatigue test device for a reinforced pouring asphalt pavement composite structure. Fig. 4 shows the test piece failure condition of the common cast asphalt pavement composite structure without the grating after 4000 times fatigue tests, and it can be clearly seen that the test piece cracking condition almost penetrates from top to bottom. And fig. 5 shows the failure condition of the test piece of the stiffening cast asphalt pavement combined structure with the grids after 100 ten thousand fatigue tests, and the cracking condition is obviously seen from the upper part to the middle part of the grids. That is to say, under the same test condition, the downward expansion of cracks can be greatly delayed through the grids, and the fatigue times are improved.
Claims (9)
1. The paving method of the steel bridge deck stiffening pouring type asphalt mixture is characterized by comprising the following steps of: include steel sheet, anticorrosive coating, waterproof adhesive layer, protective layer, cohere and wearing and tearing layer by supreme down in proper order, the protective layer is the pouring type bituminous mixture of putting more energy into, just the protective layer is by supreme lower floor pouring type bituminous mixture, middle level grid and the upper pouring type bituminous mixture of including down, just the protective layer is mated formation according to following step:
step 1): the special transport vehicle for the cast asphalt mixture and the first paver are adopted, the special transport vehicle for the cast asphalt mixture unloads the cast asphalt mixture to the waterproof adhesive layer, and the first paver is adopted to pave the mixture to form the cast asphalt mixture at the lower layer;
step 2): immediately paving a grid on the lower layer pouring type asphalt mixture to form the middle layer grid after paving the lower layer pouring type asphalt mixture; immediately rolling the middle layer grating by a roller to embed the grating into the mixture;
step 3): adopt side direction feeder and second paver, adopt after the middle level grid paves side direction immediately the side direction feeder is by the side to feeding pouring type bituminous mixture on the middle level grid to adopt the second paver to pave the mixture and form upper strata pouring type bituminous mixture guarantees during the paving be thermal interface and can imbed the grid in the mixture between upper strata pouring type bituminous mixture and the lower floor pouring type bituminous mixture.
2. The paving method of the steel bridge deck stiffening pouring type asphalt mixture according to claim 1, characterized in that: the grating adopts a warp-knitted glass fiber grating or a warp-knitted basalt grating, and the surface soakage of the grating contains modified asphalt.
3. The paving method of the steel bridge deck stiffening pouring type asphalt mixture according to claim 1, characterized in that: the temperature of the lower layer pouring type asphalt mixture and the upper layer pouring type asphalt mixture is 180-240 ℃ when the lower layer pouring type asphalt mixture and the upper layer pouring type asphalt mixture are paved, the grids are immediately rolled by a roller after the grids are paved on the lower layer pouring type asphalt mixture, and then the upper layer pouring type asphalt mixture is paved.
4. The paving method of the steel bridge deck stiffening pouring type asphalt mixture according to claim 1, characterized in that: the thickness of the protective layer is 40 mm-50 mm.
5. The method for paving the steel bridge deck stiffening cast asphalt mixture according to claim 4, wherein: the thickness of the lower layer pouring type asphalt mixture is 20-25 mm, and the thickness of the upper layer pouring type asphalt mixture is 20-25 mm.
6. A method for paving a steel deck stiffened cast asphalt mixture according to any one of the preceding claims, wherein: the protective layer is also provided with a premixed gravel layer, the premixed gravel layer adopts premixed gravel with the particle size of 4.75-9.5 mm, and the dosage is 4-7 kg/m2。
7. A method for paving a steel deck stiffened cast asphalt mixture according to any one of the preceding claims, wherein: the two sides of the construction area are provided with tracks, the first spreading machine and the second spreading machine both travel along the tracks, the grating is coiled on the grating machine, the grating machine is positioned between the first spreading machine and the second spreading machine, and the two ends of the grating machine are provided with idler wheels matched with the tracks.
8. A method for paving a steel deck stiffened cast asphalt mixture according to any one of the preceding claims, wherein: the anti-corrosion coating is one of acrylic acid anti-corrosion paint and epoxy zinc-rich paint, the waterproof adhesive layer is one of a methyl methacrylate resin waterproof system, an epoxy resin adhesive or a solvent type adhesive, the adhesive layer is arranged between the protective layer and the wearing layer, the adhesive layer is one of modified emulsified asphalt and an epoxy resin adhesive, and the wearing layer is one of modified asphalt SMA, epoxy asphalt concrete EA or modified asphalt AC.
9. The paving method of the steel bridge deck stiffening pouring type asphalt mixture according to claim 1, characterized in that: paving the floor according to the following steps:
the method comprises the following steps: carrying out sand blasting and rust removal on the steel plate to achieve the cleanliness of Sa2.5 grade and the roughness of 50-140 microns;
step two: and (3) constructing an anticorrosive coating:
1) the anti-corrosion layer is made of acrylic acid anti-corrosion paint, and the dosage is 0.1-0.2 kg per square meter;
2) the anticorrosive layer is made of epoxy zinc-rich paint, and the thickness of the anticorrosive layer is 50-140 mu m;
step three, constructing a waterproof adhesive layer:
1) if the waterproof adhesive layer adopts a methyl methacrylate resin waterproof system: the adhesive comprises a methyl methacrylate resin film and an acrylic resin adhesive, wherein the methyl methacrylate resin film is generally constructed in two layers, the total thickness of the two layers is 2mm, and the dosage is 2.5-3.5 kg per square meter; applying an acrylic resin adhesive on the methyl methacrylate resin layer, wherein the dosage is 0.15-0.2 kg per square meter;
2) if the waterproof adhesive layer adopts an epoxy resin adhesive: the dosage of the epoxy resin adhesive is 0.4-0.5 kg per square meter;
3) if the waterproof adhesive layer adopts a solvent type adhesive: the dosage of the solvent-based adhesive is 0.2-0.4 kg per square meter.
Step four: construction of protective layer
1): adopting a special transport vehicle for the cast asphalt mixture and a first spreading machine, unloading the cast asphalt mixture to the base surface treated in the third step by the special transport vehicle for the cast asphalt mixture, and spreading the mixture by the first spreading machine to form the lower-layer cast asphalt mixture with the thickness of 20-25 mm;
2) immediately paving a grid on the lower layer pouring type asphalt mixture to form the middle layer grid after paving the lower layer pouring type asphalt mixture; and immediately rolling the laid grating by using a roller to ensure effective bonding of the grating and the cast asphalt mixture;
3) adopting a lateral feeder and a second paver, immediately feeding a pouring type asphalt mixture onto the middle-layer grating from the side surface by adopting the lateral feeder after the middle-layer grating is paved, and paving the mixture by adopting the second paver to form the upper-layer pouring type asphalt mixture with the thickness of 20-25 mm, wherein a thermal interface is ensured between the upper-layer pouring type asphalt mixture and the lower-layer pouring type asphalt mixture during paving, and the grating can be embedded into the mixture;
step five: construction of premixed macadam; spreading pre-mixed macadam with the particle size of 4.75-9.5 mm on the upper-layer casting type asphalt mixture, wherein the using amount of the pre-mixed macadam is 4-7 kg/m2；
Step six: and (3) adhesive layer construction:
1) if the sticky layer is made of modified emulsified asphalt, the dosage is 0.3-0.5 kg per square meter;
2) if the adhesive layer is made of epoxy resin adhesive, the dosage is 0.5-0.6 kg per square meter;
step seven: constructing a wearing layer; the wearing layer is made of one of modified asphalt SMA, epoxy asphalt concrete EA or modified asphalt AC, the thickness of the wearing layer is 25-40 mm, and after paving of the wearing layer is finished, a road roller is used for rolling the constructed road surface.
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| CN112982175A (en) * | 2021-03-11 | 2021-06-18 | 济南金曰公路工程有限公司 | Pouring type asphalt concrete paving construction process |
| CN113789691A (en) * | 2021-08-20 | 2021-12-14 | 山东高速基础设施建设有限公司 | Stress-compensated high-toughness asphalt pavement and construction method |
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| CN113789691A (en) * | 2021-08-20 | 2021-12-14 | 山东高速基础设施建设有限公司 | Stress-compensated high-toughness asphalt pavement and construction method |
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