CN217781616U - Asphalt pavement structure - Google Patents
Asphalt pavement structure Download PDFInfo
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- CN217781616U CN217781616U CN202220855103.6U CN202220855103U CN217781616U CN 217781616 U CN217781616 U CN 217781616U CN 202220855103 U CN202220855103 U CN 202220855103U CN 217781616 U CN217781616 U CN 217781616U
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Abstract
The utility model discloses a bituminous paving structure relates to road engineering technical field. The soil base layer, the gravel base layer, the lower sealing layer, the permeable layer and the surface layer are sequentially arranged from bottom to top; the surface layers are an upper surface layer, a middle surface layer and a lower surface layer from top to bottom in sequence, and modified emulsified asphalt adhesive layers are arranged between the upper surface layer and the middle surface layer and between the middle surface layer and the lower surface layer; the bonding among the upper surface layer, the middle surface layer and the lower surface layer can be strengthened, and the modified emulsified asphalt bonding layer can play a waterproof role. The utility model discloses guarantee intensity, stability and waterproof ability of road surface structural layer, increase road surface structure's life.
Description
Technical Field
The utility model relates to a road engineering technical field especially relates to a bituminous paving structure.
Background
The pavement design is comprehensively designed according to the traffic volume, the composition condition and the road grade, the use task function, the natural conditions of local materials, climate, hydrology, soil texture and the like, and the practical experience of the local area, and the principles of adjusting local conditions, reasonably selecting materials, facilitating construction and facilitating maintenance. The surface characteristics of the asphalt concrete pavement mainly affect the service performance of the road and play a key role in the aspects of road safety, driving comfort and the like.
Asphalt pavement structure is because long-time exposure in natural environment and bear past vehicle load, and later stage can produce crack, lax, ageing, wearing and tearing scheduling problem, and asphalt pavement structure surface is impaired this moment, and inside basic unit exposes in the environment, but if not repair in time, then pavement structure easily suffers harm, and water damage is one of the leading harm wherein.
In rainy and snowy weather, the asphalt pavement structure is easy to be damaged by surface water, the pavement can be loosened in structure and even has pit grooves, the surface is corroded by the surface water, the surface water enters the base layer along pavement cracks, the base layer is easy to soften, the pavement service performance is influenced, the pavement structural strength is reduced, the whole pavement structure is damaged, and great potential safety hazards are brought to running vehicles. If maintenance and repair are carried out, the periodic large and medium repair cause delayed interruption of the road, and a large amount of resource waste and economic loss are caused.
Therefore, in order to meet the long-term use requirement of the pavement, the quality and the performance of the pavement structure need to be improved in the early stage besides the later periodic maintenance, so that the pavement structure has good structural strength and durability, the service life of the pavement is prolonged, and the maintenance pressure is relieved.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides an asphalt pavement structure.
The utility model adopts the technical proposal that:
an asphalt pavement structure comprises a soil base course, a gravel base course, a lower seal coat, a permeable course and a surface course from bottom to top in sequence;
the surface layers comprise an upper surface layer, a middle surface layer and a lower surface layer from top to bottom in sequence, and modified emulsified asphalt bonding layers are arranged between the upper surface layer and the middle surface layer and between the middle surface layer and the lower surface layer; the bonding among the upper surface layer, the middle surface layer and the lower surface layer can be strengthened, and the modified emulsified asphalt bonding layer can play a waterproof role.
The lower seal layer is prepared by modified asphalt with gravels uniformly distributed on the surface; and a glass fiber grating is arranged between the lower sealing layer and the transparent layer. The glass fiber grating has higher tensile strength, effectively improves the road force dispersion of the road surface structure, and prolongs the service life.
Preferably, the modified asphalt is SBS modified asphalt, the broken stones in the lower seal layer do not have overlapping surfaces, and the area of the broken stones in the overlooking view accounts for 60-70% of the surface area of the modified asphalt.
Preferably, the thickness of the lower sealing layer is 5mm-15mm.
Preferably, the modified emulsified asphalt adhesive layer adopts PC-3 type emulsified asphalt, and the spreading amount of the PC-3 type emulsified asphalt is 0.4-0.6L/m < 2 >.
Preferably, the permeable layer is prepared from PC-2 type emulsified asphalt, and the spreading amount of the PC-2 type emulsified asphalt is 1.2L/m2.
Preferably, the upper surface layer adopts fine-grain type densely-matched modified asphalt concrete AC-13, the middle surface layer adopts medium-grain type densely-matched modified asphalt concrete AC-20, and the lower surface layer adopts grain type densely-matched modified asphalt concrete AC-25.
Preferably, the thickness of the upper surface layer is 4cm, the thickness of the lower surface layer is 6cm, and the thickness of the middle surface layer is 8cm.
Preferably, the gravel base comprises an upper gravel base and a lower gravel base; the upper gravel base layer is 36cm thick, and the lower gravel base layer is 18cm thick.
Preferably, the lower gravel base layer adopts 4% of cement stabilized graded gravel, and the upper gravel base layer adopts 5% of cement stabilized graded gravel.
Preferably, the resilience modulus of the soil base layer is more than or equal to 50MPa.
Preferably, the 7-day unconfined compressive strength of the upper broken stone base layer is not less than 3.5MPa, and the compactness is more than 98%; the 7-day unconfined compressive strength of the lower broken stone base layer is not less than 3MPa, and the compactness is more than 97%.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model comprises a soil base layer, a macadam base layer, a permeable layer, a lower sealing layer and a surface layer from bottom to top in sequence;
the surface layer is an upper surface layer, a middle surface layer and a lower surface layer from bottom to top in sequence and is divided into a three-layer structure, and modified emulsified asphalt adhesive layers are arranged among the upper surface layer, the middle surface layer and the lower surface layer; the bonding between the surface layers can be enhanced, and the strength, stability and waterproof capability of the pavement structure layer are ensured;
the lower sealing layer is prepared by modified asphalt with gravels uniformly distributed on the surface, a glass fiber grating is arranged between the lower sealing layer and the permeable layer, the glass grating has high tensile strength, can effectively improve road force distribution of a road surface structure, resists and postpones the attack of road surface diseases formed by road bed cracks, enables the asphalt concrete structure layer not to be damaged by load caused by tension deformation in a long period, and prolongs the service life of the road surface.
Drawings
FIG. 1 is a schematic structural view of an asphalt pavement structure provided by the present invention;
reference numerals:
1-a soil base layer; 2-a macadam foundation; 201-lower gravel base; 202-upper gravel base; 3-a permeable layer; 4-lower sealing layer;
5-surface layer; 501-upper surface layer; 502-middle layer; 503-lower surface layer; 6-modified emulsified asphalt adhesive layer;
7-glass fiber grating.
Detailed Description
For making the purpose and technical solution of the embodiment of the present invention clearer, the following will be combined with the embodiment of the present invention, right the technical solution of the present invention is beneficial to clear and complete description.
In the description of the present application, it is to be understood that the terms "length," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer" and the like are used in a generic and descriptive sense only and not for purposes of limitation, but merely to indicate or imply that the device or element being referred to must be oriented, constructed or operated in a specific orientation and not to be construed as limited by the scope of the application.
As shown in fig. 1, the asphalt pavement structure comprises a soil base layer 1, a macadam base layer 2, a lower seal coat 4, a permeable layer 3 and a surface layer 5 from bottom to top in sequence.
The soil base layer 1 is formed by excavating, paving and rolling a roadbed, rolling speed and rolling times are determined according to process test, and rolling is carried out by a heavy vibratory roller according to the principle that two sides are firstly followed by the middle (the curve is firstly at the inner side of the curve and then at the outer side of the curve), and the rolling is carried out slowly and then quickly. The joints of the joint sections are mutually overlapped and compacted, the longitudinal overlapping length is not less than 2m, the overlap of wheel tracks between longitudinal rails is not less than 40cm, and the stagger of upper and lower layers of filling joints is not less than 3m. If the unevenness is found in the rolling process, manual junction matching and in-time leveling are adopted, so that the rolled pavement flatness meets the junction requirement. After rolling with a conventional road roller according to the above specifications, a vibratory roller with continuous compaction control/intelligent compaction enabling is used for facilitating rolling and detection to control the uniformity of the compacted soil quantity. And tamping the part which is embedded with the settlement observation device and cannot be rolled by using a battering ram. And finally, the resilience modulus of the soil base layer 1 is more than or equal to 50MPa.
The gravel base 2 comprises an upper gravel base 202 and a lower gravel base 201; the thickness of the upper gravel base layer 202 is 36cm, and the thickness of the lower gravel base layer 201 is 18cm.
The lower gravel base 201 is made of 4% cement stabilized graded gravel, and the upper gravel base 202 is made of 5% cement stabilized graded gravel. The cement stabilized macadam takes graded macadam as aggregate, adopts a certain amount of gelled materials and enough mortar volume to fill gaps of the aggregate, and is beneficial to paving and compacting according to embedding and extruding. The early strength is high, the strength is increased along with the age and is quickly formed into a plate body, and the plate body has high strength, good impermeability and good freezing resistance.
The cement consumption is determined by utilizing a combining ratio to test and combine the road before the construction of the gravel base layer 2, wherein the lower gravel base layer 201 is intensively mixed, the road is compacted in a single layer, the compaction degree is more than or equal to 96 percent, and after the cement-stabilized gravel base layer is paved, the maintenance (the survival period is generally 7 days) and the road control must be carried out. When watering, the water quantity must be controlled by attention, and the water soaking phenomenon is strictly forbidden. The 202 roads of the upper gravel base layer are intensively mixed and rolled in two layers, and the compaction degree is more than or equal to 98 percent. Rolling and bearing (the bearing period is generally 7 days), pouring oil on the permeable layer 3 under the road with a slightly dry surface but not hardened, and paving the asphalt lower sealing layer 4 in time. The square working road is noticed that the upper square working road benefits 7 days later. Finally, the 7-day unconfined compressive strength of the upper crushed stone base layer 202 is not less than 3.5MPa, and the compactness is more than 98%; the 7-day unconfined compressive strength of the lower broken stone base layer 201 is not less than 3MPa, and the compactness is more than 97%.
In order to make the asphalt surface layer 5 well combined with the non-asphalt equivalent macadam base layer 2, high-permeability emulsified asphalt is sprayed on the base layer, and a thin layer of the emulsified asphalt penetrating into the surface of the base layer is called a permeable layer 3. The permeable layer 3 is prepared from PC-2 type emulsified asphalt, the spreading amount of the PC-2 type emulsified asphalt is 1.2L/m < 2 >, and the specific using amount can be adjusted according to the concentration (asphalt content) of the road emulsified asphalt. The penetration depth of the permeable layer 3 reaches the depth of more than 5mm on the surface of the upper gravel base 202, and the permeable layer 3 plays a role in transition, bonding and consolidation of the surface of the base. The penetrating layer 3 is used as a material, so that interlayer damage is reduced, and the penetrating layer plays a very important role in improving the durability of the pavement.
After the surface of the permeable layer 3 is completely dried, the modified asphalt is sprayed to facilitate the square operation of the lower sealing layer 4. The thickness of the lower seal layer 4 is 5mm-15mm, and the lower seal layer is prepared by adopting modified asphalt with uniformly distributed gravels on the surface; the modified asphalt is SBS modified asphalt, the broken stones in the lower seal layer 4 do not have overlapping surfaces, no road overlapping or interlayer is generated, and the area of the broken stones accounts for 60% -70% of the surface area of the modified asphalt in a overlooking view. Preferably, the broken stone is selected from the melon and rice stone.
And a glass fiber grating 7 is arranged between the lower sealing layer 4 and the transparent layer 3. The glass fiber grating 7 is in a mesh structure, has strong stability, and is filled with the modified asphalt mixture of the mesh and the lower sealing layer 4, so that the stability is further enhanced. The glass fiber geogrid 7 has high tensile strength, can effectively improve road force spreading of a road surface structure, resists and postpones the attack of road surface diseases formed by roadbed cracks, enables the asphalt concrete structure layer not to suffer load damage caused by tension deformation in a long period, and greatly prolongs the service life of the road surface by using the glass fiber geogrid compared with an asphalt concrete road surface layer without the glass fiber geogrid.
The surface layer 5 is sequentially provided with an upper surface layer 501, a middle surface layer 502 and a lower surface layer 503 from top to bottom, the upper surface layer 501 adopts fine-grain type densely-matched modified asphalt concrete AC-13, the middle surface layer 502 adopts medium-grain type densely-matched modified asphalt concrete AC-20, and the lower surface layer 503 adopts coarse-grain type densely-matched modified asphalt concrete AC-25.
The thickness of the upper surface layer 501 is 4cm, the thickness of the lower surface layer 503 is 6cm, and the thickness of the middle surface layer 502 is 8cm. Modified emulsified asphalt adhesive layers 6 are arranged between the upper surface layer 501 and the middle surface layer 502 and between the middle surface layer 502 and the lower surface layer 503; the modified emulsified asphalt adhesive layer 6 is made of PC-3 type emulsified asphalt, the spreading amount of the PC-3 type emulsified asphalt is 0.4-0.6L/m & lt 2 & gt, the modified emulsified asphalt adhesive layer 6 can strengthen the bonding among the upper surface layer 501, the middle surface layer 502 and the lower surface layer 503, so that the modified emulsified asphalt adhesive layer has enough adhesive force, two adjacent surface layers 5 are bonded into a firm whole to prevent the adjacent two layers from sliding and moving, and the modified emulsified asphalt adhesive layer 6 can play a role in water resistance.
In the process of the construction, before coarse grain type densely-distributed modified asphalt concrete AC-25 of the lower surface layer 503 is paved, the surface of the lower sealing layer 4 is cleaned, and the surface of the surface layer is cleaned before the modified emulsified asphalt adhesive layer 6 is spread among the surface layers 5, so that the influence of miscellaneous soil on the bonding strength among the layers is prevented.
The above is only the practical way of the present invention, and the description thereof is specific and detailed, but can not follow the above and is a limitation to the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and all of them belong to the scope of the present invention.
Claims (10)
1. An asphalt pavement structure, its characterized in that:
the soil base layer, the gravel base layer, the permeable layer, the lower sealing layer and the surface layer are sequentially arranged from bottom to top;
the surface layers comprise an upper surface layer, a middle surface layer and a lower surface layer from top to bottom in sequence, and modified emulsified asphalt bonding layers are arranged between the upper surface layer and the middle surface layer and between the middle surface layer and the lower surface layer;
the lower seal layer is prepared by modified asphalt with gravels uniformly distributed on the surface; and a glass fiber grating is arranged between the lower sealing layer and the transparent layer.
2. An asphalt pavement structure as defined in claim 1, wherein: the modified asphalt is SBS modified asphalt, the broken stones in the lower seal layer do not have overlapping surfaces, and the area of the broken stones accounts for 60% -70% of the surface area of the modified asphalt in a top view.
3. An asphalt pavement structure as defined in claim 1, wherein: the thickness of the lower sealing layer is 10mm-15mm.
4. An asphalt pavement structure as defined in claim 1, wherein: the modified emulsified asphalt adhesive layer adopts PC-3 type emulsified asphalt, and the spreading amount of the PC-3 type emulsified asphalt is 0.4-0.6L/m 2 。
5. An asphalt pavement structure as defined in claim 1, wherein: the permeable layer is prepared from PC-2 type emulsified asphalt, and the spreading amount of the PC-2 type emulsified asphalt is 1.2L/m 2 。
6. An asphalt pavement structure as defined in claim 1, wherein: the upper surface layer adopts fine-grain type densely-distributed modified asphalt concrete AC-13, the middle surface layer adopts medium-grain type densely-distributed modified asphalt concrete AC-20, and the lower surface layer adopts grain type densely-distributed modified asphalt concrete AC-25.
7. An asphalt pavement structure as defined in claim 1, wherein:
the thickness of the upper surface layer is 4cm, the thickness of the lower surface layer is 6cm, and the thickness of the middle surface layer is 8cm.
8. An asphalt pavement structure as defined in claim 1, wherein: the gravel base comprises an upper gravel base and a lower gravel base; the upper gravel base layer is 36cm thick, and the lower gravel base layer is 18cm thick.
9. An asphalt pavement structure as defined in claim 8, wherein: the lower gravel base layer is made of 4% cement stabilized graded gravel, and the upper gravel base layer is made of 5% cement stabilized graded gravel.
10. An asphalt pavement structure as defined in claim 8, wherein: the 7-day unconfined compressive strength of the upper broken stone base layer is not less than 3.5MPa, and the compactness is more than 98%; the 7-day unconfined compressive strength of the lower broken stone base layer is not less than 3MPa, and the compactness is more than 97%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220855103.6U CN217781616U (en) | 2022-04-13 | 2022-04-13 | Asphalt pavement structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220855103.6U CN217781616U (en) | 2022-04-13 | 2022-04-13 | Asphalt pavement structure |
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| Publication Number | Publication Date |
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| CN217781616U true CN217781616U (en) | 2022-11-11 |
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| CN202220855103.6U Active CN217781616U (en) | 2022-04-13 | 2022-04-13 | Asphalt pavement structure |
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