CN110904851A - Bridge deck pavement method - Google Patents
Bridge deck pavement method Download PDFInfo
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- CN110904851A CN110904851A CN201911303159.XA CN201911303159A CN110904851A CN 110904851 A CN110904851 A CN 110904851A CN 201911303159 A CN201911303159 A CN 201911303159A CN 110904851 A CN110904851 A CN 110904851A
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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
- 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
Abstract
The invention relates to the technical field of civil engineering, in particular to a bridge deck pavement method, aiming at solving the problems that a concrete bridge deck is easy to deform and crack in the prior art; the anti-fatigue, anti-aging and anti-water damage capability is poor, and the technical key point is that the method comprises the following steps: s1, bridge deck pretreatment; s2, laying a polymer resin particle bonding layer: brushing a resin cushion layer on the cleaned bridge floor, spreading high molecular resin particles, and rolling by using a rubber-tyred roller to enable part of the resin cushion layer to sink into the resin cushion layer; s3, laying a waterproof bonding layer: after the resin is cured, coating a layer of waterproof adhesive; s4, laying a stress absorption layer: after the waterproof adhesive is cured, paving a stress absorption layer on the waterproof adhesive; s5, paving a pavement layer: and after the stress absorption layer is constructed, paving a pavement layer on the stress absorption layer. The paving structure has the advantages of thin overall thickness, light weight, good bonding performance among layers and high shear strength, and is beneficial to improving the durability of the bridge paving layer.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a bridge deck pavement method.
Background
With the continuous progress and the great development of bridge design and construction technology in China, bridge construction technology in China is ascending in the advanced ranks of bridge construction in the world, and the larger the bridge overhaul scale is, the larger the span is. The large-span bridge structure is mainly formed by orthogonal special-shaped plates and is constructed by stay cable and suspension cable technologies. For a long time, bridge deck pavement is treated as a part of a road, and is mainly treated by asphalt and asphalt modification, no matter what asphalt is, the bridge deck pavement can only be used as functional pavement, and does not contribute to the rigidity of the bridge deck or greatly contributes to the rigidity of the bridge deck, when a vehicle load passes through, particularly an overweight vehicle passes through, the rigidity of the steel bridge deck designed at present is difficult to meet the influence of the load, particularly the overload, and the concrete bridge deck pavement structure is easy to crack due to long-term fatigue action.
At present, the main reasons for the damage of the bridge deck pavement of the domestic concrete bridge are that the bridge deck pavement cannot be stressed together with a bridge deck slab in a synergistic manner, and the shearing resistance and the high-temperature stability of the bridge deck pavement are insufficient. The reasons for the damage of the asphalt concrete bridge deck pavement are as follows:
(1) the waterproof bonding layer between the bridge structure and the flexible paving layer plays a vital role in a bridge deck paving layer. The layer has the transition function of starting and stopping, and can be used as a waterproof layer. Studies have shown that many damages are induced by this layer, because the shear resistance of the bridge structure and the asphalt pavement is neglected, and the bonding effect of the bonding layer is excessively relied on, which results in the generation of face layer jostling, crowding, waves and ruts, and also in the damages of bridge deck tearing, peeling and the like. Therefore, the bond coat must have sufficient toughness and reasonable amount, which is often difficult to meet with conventional asphalt.
(2) For cement concrete bridges, the difference between the asphalt concrete pavement layer and the bridge cement concrete structure in material performance is large, namely, the asphalt concrete pavement layer is flexible and rigid, so that the stress and deformation are discontinuous under the action of external force. On bridge structures with much greater rigidity, the flexible paving layer must have sufficient strength and stability, and especially the shear strength is more critical. In addition, the bridge has large deflection, violent vibration and obvious temperature stress, and the conditions of the external force are severer than the conditions of the same material in a road surface. This requires that the paving material be more flexible, durable, and have a higher high temperature shear resistance.
(3) The bridge deck pavement layer and the road surface structure layer have obvious difference in stress characteristics, so that higher requirements on materials and structure design are met. Conventionally, the pavement layer is usually designed and constructed as a common pavement structure, and is not specially designed and processed according to the stress characteristics, so that the design is unreasonable, and various early damages are induced.
(4) The bridge deck structure is completely exposed in the air due to the structural characteristics of the bridge deck structure, and is directly influenced by the climatic conditions, so compared with the material in the road surface, the temperature of the bridge deck pavement layer material is higher in summer and lower in winter, namely the influence of the same climatic conditions on the pavement material is more severe. Therefore, higher requirements are provided for the temperature sensitivity of the paving material, and challenges are provided for the high-temperature stability and the low-temperature crack resistance of the asphalt mixture, and the contradictory requirements are often insufficient if borne by a common asphalt concrete structure.
(5) Water is one of the main causes of damage of the asphalt pavement layer, and the pavement layer loses strength and waterproof capability due to poor adhesion of asphalt, overlarge porosity or pavement layer cracking, water seepage and damage such as loosening, pit and the like. If the drainage system of the bridge and the pavement layer is not properly designed, the water seeped by people cannot be drained in time, and the whole pavement layer is placed in a large water bath, so that the damage of the pavement layer is aggravated. If the waterproof layer is damaged, the bridge body is directly corroded by the seepage water, so that the safety of the bridge is endangered. Therefore, a perfect bridge deck pavement system and a waterproof pavement layer are key measures for ensuring pavement service performance.
(6) At present, the overload phenomenon of the vehicles in China is more prominent, and the overload of some vehicles is even more than 100 percent and is far greater than the current road surface design standard axle load in China. Both mechanical analysis and practical conditions prove that the overweight vehicle is the 'killer' of the bridge deck pavement material, which is more damaged than the asphalt pavement material, and is determined by the stress characteristics of the bridge deck pavement structure layer. Therefore, on one hand, the bridge of a large-sized super-heavy vehicle is strictly limited, and on the other hand, the grade and design standard of the pavement layer are improved.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the concrete bridge deck is easy to deform and crack, and has poor anti-fatigue, anti-aging and anti-water damage capabilities in the prior art, thereby providing a bridge deck pavement method.
The technical purpose of the invention is realized by the following technical scheme:
a method of paving a bridge deck, comprising the steps of:
s1, bridge deck pretreatment: roughening the newly-built concrete bridge deck, performing sand blasting or grooving operation, and simultaneously performing surface sealing treatment on cracks of the bridge deck;
s2, laying a polymer resin particle bonding layer: brushing a resin cushion layer on the cleaned bridge floor, spreading high polymer resin particles, and rolling by using a 20t rubber-tyred roller to enable part of the resin cushion layer to be sunk into the resin cushion layer;
s3, laying a waterproof bonding layer: after the resin is cured, the weight of the resin is 0.3-0.6kg/m2Coating a layer of waterproof adhesive;
s4, laying a stress absorption layer: after the waterproof adhesive is cured, spreading a stress absorption layer with the thickness of 3-5mm on the waterproof adhesive;
s5, paving a pavement layer: after the stress absorption layer is constructed, a pavement layer with the thickness of 25-35mm is paved on the stress absorption layer.
Optionally, in step S1, after the bridge deck roughening treatment is completed, cleaning the cracks with a width of not more than 0.15mm, scraping the crack sealing glue onto the cracks with a scraper knife, wherein the thickness of the crack sealing glue is 0.8-1.2mm, the width of the crack sealing glue is 20-30mm, and the cracks are prevented from generating small holes and bubbles during glue smearing, and are scraped flat, so as to ensure tight and reliable sealing; and (3) performing air compression leakage test after the crack is closed, coating a layer of soapy water along the crack after the crack sealing glue is solidified, introducing compressed air from the glue injection base, marking if bubbles emerge, indicating that the crack is leaked, sealing the leaked area by using the sealant, performing air detection after the strength is reached, and repeating the steps until the crack is not leaked.
Optionally, in step S1, after the bridge deck is napped, holes are drilled along the cracks according to the principle of surrounding hole distribution after the bridge deck is napped, the hole distance is 15-20cm, the drilling diameter is 6-8mm, and the depth is the crack depth, then the cracks and dust in the holes are blown out by a high-pressure air pump, then the cracks are sealed by using a joint sealing glue and the needles are buried in the filling holes for fixation, the filling operation is performed after the joint sealing glue is dried, YJ-401 grouting resin prepared according to the proportion is continuously injected, the resin deficiency can be supplemented repeatedly until all cracks are filled, and a grinding machine can be used for grinding the surface joint sealing glue when necessary.
Optionally, in step S2, the resin in the resin cushion layer is epoxy resin, acrylic resin, polyurethane or a mixture thereof, the amount is 1.5-2.5kg/m, the dry film thickness is 1.5-3.0mm, and one or more of inorganic filler, chopped fiber or coupling agent is doped in the resin cushion layer.
Optionally, in step S2, the polymer resin particles are formed by copolymerizing and mixing EVA resin and styrene resin, the content of vinyl acetate in the EVA resin is 10% to 40%, the blending ratio of the EVA resin to the styrene resin is 8: 1.
optionally, the polymer resin particles are round particles, the particle size of the particles is 1.0-4.0mm, the softening point of the particles is 150 ℃, the application dosage of the polymer resin particles is 0.2-1.0kg/m, and the immersion height of the polymer resin particles in the resin cushion layer is 1.0-2.0 mm.
Optionally, in step S3, the waterproof adhesive uses an ester adhesive as a primer, the ester adhesive includes thermosetting adhesive polyester, a catalyst and an oxidant, the catalyst is an organic cobalt salt, the oxidant is a methyl ethyl ketone peroxide solution, and a mass ratio of the thermosetting adhesive polyester, the catalyst and the oxidant is 100: 4: 1.
optionally, in step S4, the stress absorbing layer is composed of modified asphalt mastic, the modified asphalt mastic includes SBS modified asphalt with a weight ratio of (10-35):100 and a component a, the component a is composed of mineral powder or a mixture of mineral powder and stone dust, the SBS modified asphalt is formed by mixing a SBS modifier and matrix asphalt, and the weight ratio of the SBS modifier to the matrix asphalt is (1-10): 100.
Optionally, in step S5, two sides of each lane of the road surface layer are provided with a frustum-shaped deformation groove having a large top and a small bottom in cross-sectional shape, an elastic block that is matched with the deformation groove and is flush with the surface of the road surface layer is arranged in the deformation groove, and the deformation groove contracts inwards after being cooled so that the elastic block protrudes out of the surface of the road surface layer.
Optionally, an annular clamping and embedding groove concentric with the elastic block is formed in the side face of the elastic block, an annular clamping and embedding block clamped and embedded with the annular clamping and embedding groove is formed in the side wall of the deformation groove, a cavity is formed in the inner portion of the elastic block, and a spring is placed in the cavity and is perpendicular to the road surface layer in the stress direction.
The technical scheme of the invention has the following advantages:
1. the bridge deck pavement method of the invention is characterized in that the first bonding layer is composed of a modified resin cushion layer and high polymer resin particles. The modified resin is coated on the surface of concrete, and is doped with additives such as inorganic filler, chopped fiber, coupling agent and the like, so that the modified resin has the functions of bonding, water resistance and heat insulation. The inorganic filler and the chopped fibers increase the impact resistance, the shearing resistance and the crack resistance of the resin cushion layer, and meanwhile, the inorganic filler with low heat conductivity coefficient can block the temperature transfer between the bridge deck pavement layers and increase the stability of the bonding layer and the asphalt mixture surface layer. The coupling agent can increase the wettability between the resin coating and the fiber and between the resin coating and the polymer resin particles, promote the fusion of an organic-inorganic interface of the resin cushion layer and the concrete bridge floor and increase the interlayer cohesiveness. The lower half part of the polymer resin particles immersed in the resin layer can be well bonded with the resin cushion layer, and the upper half part of the polymer resin particles is in a molten state under the high-temperature action of the hot-mixed asphalt mixture and can be integrated with the asphalt mixture bottom layer with the porosity of 3-5% to form a saw-toothed locking and embedding structure, so that the resin cushion layer and the asphalt pavement layer are combined into a whole, and the purposes of preventing interlayer sliding and cracking and improving the service durability of the pavement layer are achieved. Through detection, the shear strength between the lower layers of the polymer resin particle bonding layer at 60 ℃ is larger than 1.0MPa, and is far larger than that of bonding layer schemes of other single resin, broken stone, emulsified asphalt and the like.
2. According to the bridge deck pavement method, the reactive waterproof adhesive is adopted as the second bonding layer, and is a special waterproof material for bridges and tunnels, so that the bonding and shearing effects between the waterproof bonding layer and the stress absorption layer can be enhanced, good compressive strength, good flexural strength, good integrity and waterproofness can be further ensured, the repeated action of large-flow vehicle load can be resisted, the bridge deck is ensured not to be damaged by ruts, cracks and the like, the whole bridge deck is ensured to be waterproof and seep water, and a waterproof effect is achieved.
3. According to the bridge deck pavement method, the stress absorption layer of the modified asphalt mastic is adopted, so that the deformation of the pavement layer and the bridge deck can be coordinated, and the deflection deformation of the bridge deck under the action of automobile load can be alleviated; the penetration of the pavement surface layer on the waterproof layer can be obviously reduced, and the influence of the temperature of the upper asphalt concrete on the waterproof bonding layer is reduced; can prevent the infiltration of water and has certain waterproof function; the bonding force between the waterproof bonding layer and the asphalt concrete pavement layer can be improved; the pavement thickness of the surface layer can be reduced to a certain degree.
4. According to the bridge deck pavement method, the modified SMA asphalt mastic macadam mixture has good high-temperature stability, slip resistance, low-temperature crack resistance, flatness, fatigue resistance and the like, and is small in void ratio and good in water stability. The moderate-temperature modifier is added into the modified SMA, so that the mixing, transportation and paving temperatures of the mixture can be greatly reduced, the temperature is reduced by about 30-50 ℃, and a large amount of energy consumption is saved; in the bridge deck pavement, the warm-mixed SMA mixture has excellent compaction performance and reduces rolling circulation; the smoke and gas are reduced in the construction of the warm-mixing modified SMA mixture, namely the emission of harmful substances such as CO2 and dust can be reduced, so that the damage to the environment and the health hazard to constructors are reduced, and the effect of more environmental protection is achieved; the warm-mix modified SMA mixture has better pavement performance, and improves the high-temperature anti-rutting capability, the water damage resistance capability, the ageing resistance capability and the like of the mixture.
5. According to the bridge deck pavement method, when weather is suddenly cooled, due to thermal expansion and cold contraction, the asphalt concrete contracts towards the deformation groove, the volume of the deformation groove is reduced, the elastic block protrudes outwards from the surface of the asphalt concrete base layer, when a vehicle passes through, the ice layer has a downward moving stroke, so that the ice layer is broken, and meanwhile, when the elastic block is ejected outwards, the ability of breaking thin ice is achieved; when the road is not frozen and is cold, a certain deceleration effect can be achieved, and meanwhile, the position can bear the deformation of the asphalt concrete, so that the asphalt concrete is prevented from cracking; when the temperature is higher, the elastic block is hidden in the deformation groove, and the abrasion loss of the elastic block is reduced.
6. In the bridge deck pavement method, the annular clamping and embedding block and the annular clamping and embedding groove are mutually clamped and embedded and matched, certain tension is improved, the situation that the elastic block pops outwards when a tire is in contact with the elastic block is avoided, and in addition, the arrangement of the cavity and the spring improves the buffering and ice breaking capacity and further prolongs the service life of the elastic block.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a deck pavement structure according to an embodiment of the present invention;
fig. 2 is an enlarged schematic view of a portion a of fig. 1.
Description of reference numerals:
1. a polymer resin particle adhesive layer; 2. a waterproof adhesive layer; 3. a stress absorbing layer; 4. a pavement layer; 41. a deformation groove; 42. an elastic block; 43. an annular embedding groove; 44. an annular snap-in block; 45. a cavity; 46. a spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
a method of paving a bridge deck, as shown in figures 1 and 2, comprising the steps of:
s1, bridge deck pretreatment: roughening the newly-built concrete bridge deck, performing sand blasting or grooving operation, and simultaneously performing surface sealing treatment on cracks of the bridge deck;
in the embodiment of the invention, the crack with the width not more than 0.15mm appears, so that after the bridge floor roughening treatment is finished, cleaning is carried out, the seam sealing glue is scraped and smeared on the crack by a scraper knife, the thickness is 0.8-1.2mm, the width is 20-30mm, small holes and bubbles are prevented from being generated during gluing, the leveling is carried out, and the sealing is tight and reliable; after the crack is sealed, air compression leakage test is carried out, after the seam sealing glue is solidified, a layer of soapy water is coated along the crack, compressed air is introduced from the glue injection base, if bubbles emerge, the crack is subjected to air leakage, a mark is made, the area with air leakage is sealed by the sealant, air detection is carried out again after the strength is reached, and the steps are repeated until no air leakage occurs;
s2, laying polymer resin particle adhesive layer 1: brushing a resin cushion layer on the cleaned bridge floor, spreading high polymer resin particles, and rolling by using a 20t rubber-tyred roller to enable part of the resin cushion layer to be sunk into the resin cushion layer;
specifically, the resin in the resin cushion layer is epoxy resin, acrylic resin, polyurethane or a mixture thereof, the dosage is 1.5-2.5kg/m, preferably 2.0kg/m, the dry film thickness is 1.5-3.0mm, preferably 2.0mm, meanwhile, materials such as inorganic filler, chopped fiber and coupling agent are doped in the resin cushion layer, so that the resin cushion layer can be coated by blade coating or roller coating, and the inorganic filler and chopped fiber which participate in the resin are uniformly mixed;
in addition, the polymer resin particles are made of polymer materials with better viscosity and toughness by copolymerizing and mixing EVA resin and styrene resin, wherein the content of vinyl acetate in the EVA resin is 10% -40%, preferably 30%, the styrene resin is preferably high impact polystyrene resin, the blending ratio of the EVA resin to the styrene resin is preferably 8: 1; the polymer resin particles are preferably round particles, the particle diameter of the particles is 1.0-4.0mm, preferably 3.0mm, the softening point of the particles is 150 ℃, the polymer resin particles have certain viscosity and toughness at high temperature, so that the polymer resin particles are immediately sprayed after the construction of the resin cushion layer is finished, and the application amount of the polymer resin particles is 0.2-1.0kg/m, preferably 0.6kg/m, and the immersion height of the polymer resin particles in the resin cushion layer is 1.0-2.0mm, preferably 1.5 mm;
s3, laying a waterproof bonding layer 2: after the resin is cured, the weight of the resin is 0.3-0.6kg/m2Coating a layer of waterproof adhesive;
in this embodiment of the present invention, the waterproof adhesive uses an ester adhesive as a primer, the ester adhesive includes thermosetting adhesive polyester, a catalyst and an oxidant, the catalyst is an organic cobalt salt, the oxidant is a methyl ethyl ketone peroxide solution, and the mass ratio of the thermosetting adhesive polyester, the catalyst and the oxidant is preferably 100: 4:1, thereby further ensuring good compression strength, breaking strength, integrity and waterproofness, resisting repeated action of large-flow vehicle load, ensuring that the bridge deck is not damaged by ruts, cracks and the like, ensuring that the whole bridge deck is waterproof and seeps water, and playing a waterproof role;
s4, laying a stress absorption layer 3: after the waterproof adhesive is cured, a stress absorption layer 3 with the thickness of 5mm is paved on the waterproof adhesive;
specifically, the stress absorption layer is composed of modified asphalt mastic, wherein the weight ratio of SBS modified asphalt to mineral powder is 22: 100; the SBS modified asphalt is prepared by heating and mixing a modifier SBS and matrix asphalt, wherein the weight ratio of the SBS to the matrix asphalt is 6: 100; in order to improve the construction workability of the modified asphalt mastic, a medium-temperature modifier is added in the mixing process, and the weight ratio of the medium-temperature modifier to SBS modified asphalt is 2: 100;
s5, paving a pavement layer 4: after the stress absorption layer 3 is constructed, warm mixing modified SMA with the thickness of 35mm is constructed to be used as a pavement layer 4, in order to ensure the compactness and the construction workability of the SMA, a medium-temperature modifier is added in the mixing process, and the mixing ratio of the medium-temperature modifier to the modified asphalt is 2:100 in parts by weight;
in addition, in order to prevent the situation that when water vapor or rain or snow falls on the pavement layer 4, the pavement layer 4 is easy to freeze, the friction force of the frozen pavement is small, and a vehicle is easy to slip on the pavement, two sides of each lane of the pavement layer 4 are provided with frustum-shaped deformation grooves 41 with large upper parts and small lower parts in cross section shapes, specifically, the depth of each deformation groove 41 is 1.8-2.8 cm, the diameter of the upper end of each deformation groove 41 is 2-3 cm, the diameter of the lower end of each deformation groove 41 is smaller than the diameter of the upper end by 0.5-1 cm, namely, an inverted frustum with large upper part and small lower parts in longitudinal cross section shape of each deformation groove 41, an elastic block 42 which is matched and flush with the surface of the pavement layer 4 is arranged in each deformation groove 41, the height of each elastic block 42 is 2-3 cm, the diameter of the upper end of each elastic block 42 is 2-3 cm, and the diameter of the lower end of each, the deformation groove 41 is contracted inwards after being cooled so that the elastic block 41 protrudes out of the surface of the pavement layer 4, and the material of the elastic block 42 is formed by injection molding of a salt compound of which the mixing mass ratio of the wear-resistant rubber material is 2-8%; a circle of annular clamping and embedding grooves 43 are formed in the side face of the circular table of the elastic block 42 in a surrounding mode, the annular clamping and embedding grooves 43 are arranged concentrically with the elastic block 42, and annular clamping and embedding blocks 44 clamped and embedded with the annular clamping and embedding grooves 43 are arranged on the side wall of the deformation groove 41; a cavity 45 is arranged in the elastic block 42, and a spring 46 which is arranged in the cavity 45 and is perpendicular to the pavement layer 4 in the stress direction is arranged in the cavity 45.
Example 2:
a method of paving a bridge deck, as shown in figures 1 and 2, comprising the steps of:
s1, bridge deck pretreatment: roughening the newly-built concrete bridge deck, performing sand blasting or grooving operation, and simultaneously performing surface sealing treatment on cracks of the bridge deck;
in the embodiment of the invention, cracks with the width of 0.15-3mm appear, after the bridge surface roughening treatment is finished, holes are drilled along the cracks according to the principle of surrounding hole distribution, the hole distance is 15-20cm, the drilling diameter is 6-8mm, and the depth is the crack depth, then the high-pressure air pump is used for blowing dust in the cracks and the holes, then the cracks are sealed by using joint sealing glue, a needle head is buried in a filling hole for fixation, the grouting operation is carried out after the joint sealing glue is dried, YJ-401 grouting resin prepared according to the proportion is continuously injected, the resin deficiency can be supplemented repeatedly until all cracks are filled, and meanwhile, a grinding machine can be used for grinding the surface joint sealing glue if necessary;
s2, laying polymer resin particle adhesive layer 1: brushing a resin cushion layer on the cleaned bridge floor, spreading high polymer resin particles, and rolling by using a 20t rubber-tyred roller to enable part of the resin cushion layer to be sunk into the resin cushion layer;
specifically, the resin in the resin cushion layer is epoxy resin, acrylic resin, polyurethane or a mixture thereof, the dosage is 1.5-2.5kg/m, preferably 2.2kg/m, the dry film thickness is 1.5-3.0mm, preferably 2.5mm, meanwhile, materials such as inorganic filler, chopped fiber and coupling agent are doped in the resin cushion layer, so that the resin cushion layer can be coated by blade coating or roller coating, and the inorganic filler and chopped fiber which participate in the resin are uniformly mixed;
in addition, the polymer resin particles are made of polymer materials with better viscosity and toughness by copolymerizing and mixing EVA resin and styrene resin, wherein the content of vinyl acetate in the EVA resin is 10% -40%, preferably 40%, the styrene resin is preferably high impact polystyrene resin, the blending ratio of the EVA resin to the styrene resin is preferably 8: 1; the polymer resin particles are preferably round particles, the particle diameter of the particles is 1.0-4.0mm, preferably 4.0mm, the softening point of the particles is 150 ℃, the polymer resin particles have certain viscosity and toughness at high temperature, so that the polymer resin particles are immediately sprayed after the construction of the resin cushion layer is finished, and the application amount of the polymer resin particles is 0.2-1.0kg/m, preferably 1.0kg/m, and the immersion height of the polymer resin particles in the resin cushion layer is 1.0-2.0mm, preferably 2.0 mm;
s3, laying a waterproof bonding layer 2: after the resin is cured, the weight of the resin is 0.3-0.6kg/m2Coating a layer of waterproof adhesive;
in this embodiment of the present invention, the waterproof adhesive uses an ester adhesive as a primer, the ester adhesive includes thermosetting adhesive polyester, a catalyst and an oxidant, the catalyst is an organic cobalt salt, the oxidant is a methyl ethyl ketone peroxide solution, and the mass ratio of the thermosetting adhesive polyester, the catalyst and the oxidant is preferably 100: 4:1, thereby further ensuring good compression strength, breaking strength, integrity and waterproofness, resisting repeated action of large-flow vehicle load, ensuring that the bridge deck is not damaged by ruts, cracks and the like, ensuring that the whole bridge deck is waterproof and seeps water, and playing a waterproof role;
s4, laying a stress absorption layer 3: after the waterproof adhesive is cured, a stress absorption layer 3 with the thickness of 3mm is paved on the waterproof adhesive;
specifically, the stress absorption layer is composed of modified asphalt mastic, the modified asphalt mastic is formed by hot mixing of SBS modified asphalt and mineral powder, and the weight ratio of SBS modified asphalt to mineral powder is 23: 100; the SBS modified asphalt is prepared by heating and mixing a modifier SBS and matrix asphalt, wherein the weight ratio of the SBS to the matrix asphalt is 7: 100; in order to improve the construction workability of the modified asphalt mastic, a medium-temperature modifier is added in the mixing process, and the weight ratio of the medium-temperature modifier to SBS modified asphalt is 3: 100;
s5, paving a pavement layer 4: after the stress absorption layer 3 is constructed, warm mixing modified SMA with the thickness of 30mm is constructed to be used as a pavement layer 4, in order to ensure the compactness and the construction workability of the SMA, a medium-temperature modifier is added in the mixing process, and the mixing ratio of the medium-temperature modifier to the modified asphalt is 4:100 in parts by weight;
in addition, in order to prevent the situation that when water vapor or rain or snow falls on the pavement layer 4, the pavement layer 4 is easy to freeze, the friction force of the frozen pavement is small, and a vehicle is easy to slip on the pavement, two sides of each lane of the pavement layer 4 are provided with frustum-shaped deformation grooves 41 with large upper parts and small lower parts in cross section shapes, specifically, the depth of each deformation groove 41 is 1.8-2.8 cm, the diameter of the upper end of each deformation groove 41 is 2-3 cm, the diameter of the lower end of each deformation groove 41 is smaller than the diameter of the upper end by 0.5-1 cm, namely, an inverted frustum with large upper part and small lower parts in longitudinal cross section shape of each deformation groove 41, an elastic block 42 which is matched and flush with the surface of the pavement layer 4 is arranged in each deformation groove 41, the height of each elastic block 42 is 2-3 cm, the diameter of the upper end of each elastic block 42 is 2-3 cm, and the diameter of the lower end of each, the deformation groove 41 is contracted inwards after being cooled so that the elastic block 41 protrudes out of the surface of the pavement layer 4, and the material of the elastic block 42 is formed by injection molding of a salt compound of which the mixing mass ratio of the wear-resistant rubber material is 2-8%; a circle of annular clamping and embedding grooves 43 are formed in the side face of the circular table of the elastic block 42 in a surrounding mode, the annular clamping and embedding grooves 43 are arranged concentrically with the elastic block 42, and annular clamping and embedding blocks 44 clamped and embedded with the annular clamping and embedding grooves 43 are arranged on the side wall of the deformation groove 41; a cavity 45 is arranged in the elastic block 42, and a spring 46 which is arranged in the cavity 45 and is perpendicular to the pavement layer 4 in the stress direction is arranged in the cavity 45.
Example 3:
a method of paving a bridge deck, as shown in figures 1 and 2, comprising the steps of:
s1, bridge deck pretreatment: roughening the newly-built concrete bridge deck, performing sand blasting or grooving operation, and simultaneously performing surface sealing treatment on cracks of the bridge deck;
in the embodiment of the invention, the crack with the width not more than 0.15mm appears, so that after the bridge floor roughening treatment is finished, cleaning is carried out, the seam sealing glue is scraped and smeared on the crack by a scraper knife, the thickness is 0.8-1.2mm, the width is 20-30mm, small holes and bubbles are prevented from being generated during gluing, the leveling is carried out, and the sealing is tight and reliable; after the crack is sealed, air compression leakage test is carried out, after the seam sealing glue is solidified, a layer of soapy water is coated along the crack, compressed air is introduced from the glue injection base, if bubbles emerge, the crack is subjected to air leakage, a mark is made, the area with air leakage is sealed by the sealant, air detection is carried out again after the strength is reached, and the steps are repeated until no air leakage occurs;
s2, laying polymer resin particle adhesive layer 1: brushing a resin cushion layer on the cleaned bridge floor, spreading high polymer resin particles, and rolling by using a 20t rubber-tyred roller to enable part of the resin cushion layer to be sunk into the resin cushion layer;
specifically, the resin in the resin cushion layer is epoxy resin, acrylic resin, polyurethane or a mixture thereof, the dosage is 1.5-2.5kg/m, preferably 1.5kg/m, the dry film thickness is 1.5-3.0mm, preferably 1.5mm, meanwhile, materials such as inorganic filler, chopped fiber and coupling agent are doped in the resin cushion layer, so that the resin cushion layer can be coated by blade coating or roller coating, and the inorganic filler and chopped fiber which participate in the resin are uniformly mixed;
in addition, the polymer resin particles are made of polymer materials with better viscosity and toughness by copolymerizing and mixing EVA resin and styrene resin, wherein the content of vinyl acetate in the EVA resin is 10% -40%, preferably 20%, the styrene resin is preferably high impact polystyrene resin, the blending ratio of the EVA resin to the styrene resin is preferably 8: 1; the polymer resin particles are preferably round particles, the particle diameter of the particles is 1.0-4.0mm, preferably 2.0mm, the softening point of the particles is 150 ℃, the polymer resin particles have certain viscosity and toughness at high temperature, so that the polymer resin particles are immediately sprayed after the construction of the resin cushion layer is finished, and the application amount of the polymer resin particles is 0.2-1.0kg/m, preferably 0.4kg/m, and the immersion height of the polymer resin particles in the resin cushion layer is 1.0-2.0mm, preferably 1.0 mm;
s3, laying a waterproof bonding layer 2: after the resin is cured, the weight of the resin is 0.3-0.6kg/m2Coating a layer of waterproof adhesive;
in this embodiment of the present invention, the waterproof adhesive uses an ester adhesive as a primer, the ester adhesive includes thermosetting adhesive polyester, a catalyst and an oxidant, the catalyst is an organic cobalt salt, the oxidant is a methyl ethyl ketone peroxide solution, and the mass ratio of the thermosetting adhesive polyester, the catalyst and the oxidant is preferably 100: 4:1, thereby further ensuring good compression strength, breaking strength, integrity and waterproofness, resisting repeated action of large-flow vehicle load, ensuring that the bridge deck is not damaged by ruts, cracks and the like, ensuring that the whole bridge deck is waterproof and seeps water, and playing a waterproof role;
s4, laying a stress absorption layer 3: after the waterproof adhesive is cured, a stress absorption layer 3 with the thickness of 4mm is paved on the waterproof adhesive;
specifically, the stress absorption layer is composed of modified asphalt mastic, the modified asphalt mastic is formed by hot mixing of SBS modified asphalt and mineral powder, and the weight ratio of the SBS modified asphalt to the mineral powder is 20: 100; the SBS modified asphalt is prepared by heating and mixing a modifier SBS and matrix asphalt, wherein the weight ratio of the SBS to the matrix asphalt is 5: 100; in order to improve the construction workability of the modified asphalt mastic, a medium-temperature modifier is added in the mixing process, and the weight ratio of the medium-temperature modifier to SBS modified asphalt is 4: 100;
s5, paving a pavement layer 4: after the stress absorption layer 3 is constructed, warm mixing modified SMA with the thickness of 25mm is constructed to be used as a pavement layer 4, in order to ensure the compactness and the construction workability of the SMA, a medium-temperature modifier is added in the mixing process, and the mixing ratio of the medium-temperature modifier to the modified asphalt is 4:100 in parts by weight;
in addition, in order to prevent the situation that when water vapor or rain or snow falls on the pavement layer 4, the pavement layer 4 is easy to freeze, the friction force of the frozen pavement is small, and a vehicle is easy to slip on the pavement, two sides of each lane of the pavement layer 4 are provided with frustum-shaped deformation grooves 41 with large upper parts and small lower parts in cross section shapes, specifically, the depth of each deformation groove 41 is 1.8-2.8 cm, the diameter of the upper end of each deformation groove 41 is 2-3 cm, the diameter of the lower end of each deformation groove 41 is smaller than the diameter of the upper end by 0.5-1 cm, namely, an inverted frustum with large upper part and small lower parts in longitudinal cross section shape of each deformation groove 41, an elastic block 42 which is matched and flush with the surface of the pavement layer 4 is arranged in each deformation groove 41, the height of each elastic block 42 is 2-3 cm, the diameter of the upper end of each elastic block 42 is 2-3 cm, and the diameter of the lower end of each, the deformation groove 41 is contracted inwards after being cooled so that the elastic block 41 protrudes out of the surface of the pavement layer 4, and the material of the elastic block 42 is formed by injection molding of a salt compound of which the mixing mass ratio of the wear-resistant rubber material is 2-8%; a circle of annular clamping and embedding grooves 43 are formed in the side face of the circular table of the elastic block 42 in a surrounding mode, the annular clamping and embedding grooves 43 are arranged concentrically with the elastic block 42, and annular clamping and embedding blocks 44 clamped and embedded with the annular clamping and embedding grooves 43 are arranged on the side wall of the deformation groove 41; a cavity 45 is arranged in the elastic block 42, and a spring 46 which is arranged in the cavity 45 and is perpendicular to the pavement layer 4 in the stress direction is arranged in the cavity 45.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A bridge deck paving method is characterized by comprising the following steps:
s1, bridge deck pretreatment: roughening the newly-built concrete bridge deck, performing sand blasting or grooving operation, and simultaneously performing surface sealing treatment on cracks of the bridge deck;
s2, laying polymer resin particle adhesive layer (1): brushing a resin cushion layer on the cleaned bridge floor, spreading high polymer resin particles, and rolling by using a 20t rubber-tyred roller to enable part of the resin cushion layer to be sunk into the resin cushion layer;
s3, laying a waterproof bonding layer (2): after the resin is cured, the weight of the resin is 0.3-0.6kg/m2Coating a layer of waterproof adhesive;
s4, laying a stress absorption layer (3): after the waterproof adhesive is cured, spreading a stress absorbing layer (3) with the thickness of 3-5mm on the waterproof adhesive;
s5, paving a pavement layer (4): after the stress absorption layer (3) is constructed, a pavement layer (4) with the thickness of 25-35mm is paved on the stress absorption layer.
2. A bridge deck pavement method according to claim 1, wherein in step S1, after the bridge deck roughening process is completed, cleaning is performed on cracks with a width of not more than 0.15mm, and the crack sealer is scraped to the cracks with a scraper knife, wherein the crack sealer has a thickness of 0.8-1.2mm and a width of 20-30mm, and is prevented from generating pinholes and bubbles during the smearing process, and is scraped to be flat, so as to ensure the sealing to be tight and reliable; and (3) performing air compression leakage test after the crack is closed, coating a layer of soapy water along the crack after the crack sealing glue is solidified, introducing compressed air from the glue injection base, marking if bubbles emerge, indicating that the crack is leaked, sealing the leaked area by using the sealant, performing air detection after the strength is reached, and repeating the steps until the crack is not leaked.
3. A bridge deck pavement method according to claim 1, wherein in step S1, after the bridge deck roughening treatment, holes are drilled along the cracks according to the principle of surrounding the holes, the hole distance is 15-20cm, the hole diameter is 6-8mm, and the depth is the crack depth, then the cracks and dust in the holes are blown out by a high-pressure air pump, then the cracks are sealed by using a sealing glue and the needles are embedded into the filling holes for fixation, the grouting operation is performed after the sealing glue is dried, YJ-401 grouting resin prepared according to the proportion is continuously injected, the resin deficiency can be repeatedly supplemented until all cracks are filled, and the surface sealing glue can be polished by a grinding machine if necessary.
4. A bridge deck paving method as claimed in claim 1, wherein in step S2, the resin in said resin cushion layer is epoxy resin, acrylic resin, polyurethane or their mixture, the amount is 1.5-2.5kg/m, the dry film thickness is 1.5-3.0mm, and one or more of inorganic filler, chopped fiber or coupling agent is mixed in said resin cushion layer.
5. A bridge deck pavement method according to claim 1, wherein in step S2, the polymer resin particles are formed by copolymerizing and mixing EVA resin and styrene resin, the content of vinyl acetate in EVA resin is 10% -40%, the blending ratio of EVA resin to styrene resin is 8: 1.
6. a bridge deck pavement method according to claim 5, wherein said polymeric resin particles are round particles having a particle size of 1.0-4.0mm, a particle softening point of 150 ℃, a construction amount of 0.2-1.0kg/m, and a height of immersion of 1.0-2.0mm in the resin mat layer.
7. The bridge deck paving method according to claim 1, wherein in the step S3, the waterproof binder uses an ester binder as a primer, the ester binder includes thermosetting adhesive polyester, a catalyst and an oxidant, the catalyst is an organic cobalt salt, the oxidant is a methyl ethyl ketone peroxide solution, and the mass ratio of the thermosetting adhesive polyester, the catalyst and the oxidant is 100: 4: 1.
8. a bridge deck pavement method according to claim 1, wherein in step S4, said stress absorbing layer is composed of modified asphalt mastic, said modified asphalt mastic comprises SBS modified asphalt with a weight ratio of (10-35):100 and component a, said component a is composed of mineral powder or a mixture of mineral powder and stone dust, said SBS modified asphalt is formed by mixing SBS modifier with matrix asphalt with a weight ratio of (1-10): 100.
9. A bridge deck pavement method according to claim 1, wherein in step S5, each lane of the pavement layer (4) is provided with deformation grooves (41) having a shape of a truncated cone with a large top and a small bottom in cross section at two sides, the deformation grooves (41) are provided with elastic blocks (42) which are matched with the deformation grooves and flush with the surface of the pavement layer (4), and the elastic blocks (42) protrude out of the surface of the pavement layer (4) due to the inward contraction of the deformation grooves (41) after cooling.
10. A bridge deck pavement method according to claim 9, characterized in that the side surface of the elastic block (42) is provided with an annular embedding groove (43) which is concentric with the elastic block (42), the side wall of the deformation groove (41) is provided with an annular embedding block (44) which is embedded with the annular embedding groove (43), a cavity (45) is opened inside the elastic block (42), and a spring (46) which is stressed in a direction perpendicular to the road surface layer (4) is placed inside the cavity (45).
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