CN209798471U - Prevent road structure of fracture - Google Patents
Prevent road structure of fracture Download PDFInfo
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- CN209798471U CN209798471U CN201822109185.6U CN201822109185U CN209798471U CN 209798471 U CN209798471 U CN 209798471U CN 201822109185 U CN201822109185 U CN 201822109185U CN 209798471 U CN209798471 U CN 209798471U
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Abstract
The utility model discloses an anti-cracking road structure, which comprises a road bed, a cement stabilized macadam subbase layer, a filling type large-particle-size cement stabilized macadam subbase layer and an asphalt layer from bottom to top in sequence; the filling type large-particle-size cement stabilized macadam subbase layer is a structural layer formed by using large-particle-size main aggregates as a frame and filling gaps among the large-particle-size main aggregates with cement stabilized macadam fillers. The utility model discloses well filling layer basic unit has similar spring function, has certain elasticity excessive function, has anti fracture simultaneously, and resistance to deformation, anti heavy-duty prevents the pavement structure fracture, extension pavement structure life.
Description
Technical Field
The utility model belongs to the highway field, concretely relates to prevent road structure of fracture.
Background
The road surface is not only subjected to the action of wheel load, but also affected by natural environmental factors. The influence of traffic load and atmospheric factors on the road surface is generally gradually weakened along with the depth, so that the road surface is usually of a multilayer structure, the material with good quality is laid on the upper layer with larger stress, and the material with poor quality is laid on the lower layer with smaller stress, thereby forming a road surface structure form that the material with different specifications and requirements is adopted on the roadbed, and the cushion layer, the base layer and the surface layer are respectively laid.
At present, the highway asphalt pavement of the trunk road in China generally adopts a double-layer or three-layer structure form, namely a cement stabilized macadam subbase layer and a double-layer asphalt surface layer, but the problem of reflection cracks of a semi-rigid base layer is not properly solved all the time, generally, after the road is used for several years, the semi-rigid base layer has structural damages such as reflection cracks, grout pumping and the like, the service life of the structural layer is generally about 10 years, and structural overhaul is needed. How to effectively utilize the advantage that semi-rigid base course intensity is high, overcome base course self and damage the problem, guarantee basic unit structure durability is the problem of trunk highway long-life bituminous paving focus thinking and research.
SUMMERY OF THE UTILITY MODEL
The purpose of the invention is as follows: in order to overcome the defects existing in the prior art, the utility model provides a prevent road structure of fracture.
The technical scheme is as follows: in order to solve the technical problem, the anti-cracking road structure provided by the utility model comprises a road bed, a cement stabilized macadam subbase layer, a filling type large-particle size cement stabilized macadam subbase layer and an asphalt layer from bottom to top in sequence; the filling type large-particle-size cement stabilized macadam subbase layer is a structural layer formed by using large-particle-size main aggregates as a frame and filling gaps among the large-particle-size main aggregates with cement stabilized macadam fillers.
Furthermore, the large-particle-size main aggregate is crushed stone with the particle size of 26.5-37.5 mm.
Furthermore, the large-particle-size main aggregate is crushed stone with the particle size of 31.5-53 mm.
Furthermore, the large-particle-size main aggregate is crushed stone with a particle size of 37.5-63 mm.
Furthermore, the large-particle-size main aggregate is crushed stone with a particle size of 53-73 mm.
Further, the cement stabilized macadam in the filling type large-particle size cement stabilized macadam subbase layer is formed by mixing fine-particle type stabilized macadam with the maximum particle size not exceeding 1.9cm and cement.
Further, the thickness of the cement stabilized macadam subbase layer is 15-45 cm.
Furthermore, the thickness of the base layer of the filling type large-particle size cement stabilized macadam is 15-25 cm.
Further, the thickness of the asphalt layer is 7-18 cm.
The utility model also provides another anti-cracking road structure, which comprises an original semi-rigid base asphalt pavement, a filling type large-particle-size cement stabilized macadam subbase layer and an asphalt layer from bottom to top in sequence; the filling type large-particle-size cement stabilized macadam subbase layer is a structural layer formed by using large-particle-size main aggregates as a frame and filling gaps among the large-particle-size main aggregates with cement stabilized macadam fillers. The old pavement structure now includes a roadbed and a cement stabilized macadam sub-base.
the utility model discloses well cement stabilized macadam is current structural material, makes the aggregate with the graded rubble, adopts the gelled material of certain quantity and the space of sufficient mortar volume filling aggregate, paves the compaction according to inlaying crowded principle. The compactness of the mortar is close to the compactness, the strength mainly depends on the embedding, extruding and locking principles among the gravels, and simultaneously, the mortar has enough volume to fill the gaps of the aggregate. Its initial strength is high, and its strength can be quickly increased with age, and can be quickly formed into plate body, so that it has high strength, and good impermeability and frost resistance. The cement content of the cement stabilized macadam is generally 3% -6% of that of the mixture, the unconfined compressive strength of 7 days can reach 5.0Mpa, and the cement stabilized macadam is higher than other roadbed materials. The cement stabilized macadam is not muddy when meeting rain after survival and has a solid surface, and is an ideal base material of a high-grade pavement, namely a national material science data sharing network.
The utility model provides a rubble is stabilized to cement among the big particle diameter cement of filled type in the rubble sublayer is that the biggest particle diameter is no longer than 1.9 cm's the rubble of fine grain formula and the material that the mixture of cement forms, has become it between big particle diameter main aggregate space with its packing promptly the utility model provides a rubble sublayer structure is stabilized to big particle diameter cement of filled type can industrialization repetitive production and standardized construction.
The utility model discloses pack the whole flexible characteristic that presents of filling layer basic unit, not only overcome the reflection crack that semi-rigid basic unit produced, also avoided flexible basic unit to produce the net crack, disease risks such as sink, combine it with pitch layer, cement stabilized macadam subbase, effectively solved basic unit reflection crack problem, also guaranteed the bearing capacity, avoided the risk of road surface fatigue fracture.
Has the advantages that: the utility model discloses for prior art possess following advantage:
The utility model discloses well filling layer basic unit has similar spring function, has certain elasticity excessive function, has anti fracture simultaneously, and resistance to deformation, anti heavy-duty prevents the pavement structure fracture, extension pavement structure life.
The utility model discloses still probably through on the basis directly add the rubble subbase layer and the pitch layer are stabilized to the big grain diameter cement of formula of filling on original semi-rigid basic unit bituminous paving, have the resistance to deformation equally, anti heavy load prevents the pavement structure fracture, prolongs pavement structure life advantage, utilizes original road surface simultaneously, practices thrift cost and resource.
Drawings
FIG. 1 is a schematic sectional view of the structure of example 1.
FIG. 2 is a schematic sectional view of the structure of example 2.
FIG. 3 shows the service life test results of the examples and the original road surface.
The asphalt pavement comprises a 1-road bed, a 2-cement stabilized macadam subbase, a 3-filling type large-particle-size cement stabilized macadam subbase, a 4-asphalt layer and 5-original semi-rigid base asphalt.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Example 1:
As shown in fig. 1, the anti-cracking road structure sequentially comprises a road bed 1, a cement stabilized macadam subbase 2, a filling type large-particle size cement stabilized macadam subbase 3 and an asphalt layer 4 from bottom to top; the filling type large-particle-size cement stabilized macadam subbase layer 3 is a stable structure layer formed by using large-particle-size main aggregates 3.1 as a frame and filling gaps 3.3 among the large-particle-size main aggregates with cement stabilized macadams 3.2 as fillers.
The filling type large-particle-size cement stabilized macadam subbase 2 can independently and respectively select four grades of large-particle-size main aggregates with particle sizes of 26.5-37.5 mm, 31.5-53 mm, 37.5-63 mm and 53-73 mm according to the actual road construction conditions. The cement stabilized macadam in the filling type large-particle-size cement stabilized macadam subbase layer is formed by mixing fine-particle stabilized macadams with the maximum particle size not exceeding 1.9cm and cement, wherein the dosage of the cement is 6-12% of the mixture.
The thickness of the cement stabilized macadam subbase layer is 15-45 cm; the thickness of the base layer of the filling type large-particle size cement stabilized macadam is 15-25 cm; the thickness of the asphalt layer is 7-18 cm.
Example 2:
The utility model also provides another anti-cracking road structure, which comprises an original semi-rigid base asphalt pavement 5, a filling type large-particle-size cement stabilized macadam subbase 3 and an asphalt layer 4 from bottom to top in sequence; the filling type large-particle-size cement stabilized macadam subbase layer 3 is a structural layer formed by using large-particle-size main aggregates as a frame and filling gaps among the large-particle-size main aggregates with cement stabilized macadam fillers. The old pavement 5 structure now contains a road bed and a cement stabilized macadam sub-base.
The utility model discloses pack the whole flexible characteristic that presents of filling layer basic unit, not only overcome the reflection crack that semi-rigid basic unit produced, also avoided flexible basic unit to produce the net crack, disease risks such as sink, combine it with pitch layer, cement stabilized macadam subbase, effectively solved basic unit reflection crack problem, also guaranteed the bearing capacity, avoided the risk of road surface fatigue fracture.
In the embodiments 1 and 2, the service life of the original road surface is tested, as shown in fig. 3, the service life of the present invention is shown in the upper part and the service life of the present invention is shown in the lower part, which are both much longer than the service life of the existing road surface under the same stress condition.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (10)
1. The utility model provides a prevent road structure of fracture which characterized in that: the road bed comprises a road bed, a cement stabilized macadam subbase layer, a filling type large-particle-size cement stabilized macadam subbase layer and an asphalt layer from bottom to top in sequence; the filling type large-particle-size cement stabilized macadam subbase layer is a structural layer formed by using large-particle-size main aggregates as a frame and filling gaps among the large-particle-size main aggregates with cement stabilized macadam fillers.
2. a crack-resistant road structure as claimed in claim 1, characterized in that: the large-particle-size main aggregate is crushed stone with the particle size of 26.5-37.5 mm.
3. A crack-resistant road structure as claimed in claim 1, characterized in that: the large-particle-size main aggregate is crushed stone with the particle size of 31.5-53 mm.
4. a crack-resistant road structure as claimed in claim 1, characterized in that: the large-particle-size main aggregate is crushed stone with a particle size of 37.5-63 mm.
5. A crack-resistant road structure as claimed in claim 1, characterized in that: the large-particle-size main aggregate is crushed stone with a particle size of 53-73 mm.
6. A crack-resistant road structure as claimed in claim 1, characterized in that: the cement stabilized macadam in the filling type large-particle-size cement stabilized macadam subbase layer is formed by mixing fine-particle stabilized macadams with the maximum particle size not exceeding 1.9cm and cement.
7. A crack-resistant road structure as claimed in claim 1, characterized in that: the thickness of the cement stabilized macadam subbase layer is 15-45 cm.
8. A crack-resistant road structure as claimed in claim 1, characterized in that: the thickness of the subbase layer of the filling type large-particle size cement stabilized macadam is 15-25 cm.
9. A crack-resistant road structure as claimed in claim 1, characterized in that: the thickness of the asphalt layer is 7-18 cm.
10. The utility model provides a prevent road structure of fracture which characterized in that: the asphalt pavement comprises an original semi-rigid base asphalt pavement, a filling type large-particle-size cement stabilized macadam subbase layer and an asphalt layer from bottom to top in sequence; the filling type large-particle-size cement stabilized macadam subbase layer is a structural layer formed by using large-particle-size main aggregates as a frame and filling gaps among the large-particle-size main aggregates with cement stabilized macadam fillers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822109185.6U CN209798471U (en) | 2018-12-14 | 2018-12-14 | Prevent road structure of fracture |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822109185.6U CN209798471U (en) | 2018-12-14 | 2018-12-14 | Prevent road structure of fracture |
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| CN209798471U true CN209798471U (en) | 2019-12-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116043632A (en) * | 2022-12-19 | 2023-05-02 | 河南城建学院 | Functional layer used between semi-rigid base layer and asphalt pavement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116043632A (en) * | 2022-12-19 | 2023-05-02 | 河南城建学院 | Functional layer used between semi-rigid base layer and asphalt pavement |
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